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`a2) United States Patent
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`US 10,502,929 B2
`(0) Patent No.:
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`Dec. 10, 2019
`(45) Date of Patent:
`Lai et al.
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`US010502929B2
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`(54)
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`(71)
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`(72)
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`OPTICAL IMAGE CAPTURING SYSTEM
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`Applicant: ABILITY OPTO-ELECTRONICS
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`TECHNOLOGY CO.LTD., Taichung
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`(TW)
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`Chien-Hsun Lai, Taichung (TW);
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`Nai-Yuan Tang, Taichung (TW);
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`Yeong-Ming Chang, Taichung (TW)
`ABILITY OPTO-ELECTRONICS
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`TECHNOLOGYCO. LTD., Taichung
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`(TW)
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`Subject to any disclaimer, the term ofthis
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`patent is extended or adjusted under 35
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`U.S.C. 154(b) by 133 days.
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`Appl. No.: 15/239,099
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`Filed:
`Aug. 17, 2016
`Prior Publication Data
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`US 2017/0315326 Al
`Nov. 2, 2017
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`Foreign Application Priority Data
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`(TW) woe teens 105113328 A
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`Inventors:
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`Assignee:
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`Notice:
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`(2006.01)
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`(2006.01)
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`(2006.01)
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`(2006.01)
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`(2006.01)
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`(2006.01)
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`Apr. 28, 2016
`Int. Cl.
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`G02B 13/00
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`G02B 9/34
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`G02B 7/04
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`G02B 27/64
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`G02B 27/00
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`G02B 5/20
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`U.S. Cl.
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`CPC veeeeseeceee G02B 13/004 (2013.01); G02B 7/04
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`(2013.01); GO2B 9/34 (2013.01); G02B
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`27/0025 (2013.01); G02B 27/646 (2013.01);
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`G02B 5/20 (2013.01)
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`(56)
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`(58) Field of Classification Search
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`CPC we. G02B 13/004; G02B 7/04; G02B 9/34;
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`G02B 27/0025; GO2B 27/646; GO2B 5/20
`USPC oieecccc cece cee senene creer cscs eneensenees 359/715
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`See application file for complete search history.
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`References Cited
`U.S. PATENT DOCUMENTS
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`10/2008 Tang
`7/2011 Yamakawa.......... G02B 13/004
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`359/715
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`6/2015 Ahn we G02B 13/004
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`348/335
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`2008/0266678 Al
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`2011/0164328 Al*
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`2015/0177487 AL*
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`FOREIGN PATENT DOCUMENTS
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`103869452 A
`6/2014
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`106249380 A
`12/2016
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`201232090 A
`8/2012
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`M503575 U
`6/2015
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`CN
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`CN
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`TW
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`TW
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`* cited by examiner
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`Primary Examiner — Wen Huang
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`(74) Attorney, Agent, or Firm — Muncy, Geissler, Olds &
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`Lowe, P.C.
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`ABSTRACT
`(57)
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`A four-piece optical lens for capturing image anda five-
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`piece optical module for capturing image are provided. In
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`the order from an object side to an imageside, the optical
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`lens along the optical axis includesa first lens with positive
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`refractive power; a secondlens with refractive power;a third
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`lens with refractive power; and a fourth lens with refractive
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`power; and at
`least one of the image-side surface and
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`object-side surface of each of the four lens elements are
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`aspheric. The optical lens can increase aperture value and
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`improve the imagining quality for use in compact cameras.
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`23 Claims, 18 Drawing Sheets
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`| ——---~ 610.0000 NM ~ ~ ~ 470.000.NM
`oo 555.0000 NM
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`ASTIGMATIC
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`FOCUS (MILLEMETERS) DISTORTION POCUS (MILLIMETERS) %
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`6.62
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`EX 2023 Page 1
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`EX 2023 Page 1
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`U.S. Patent
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`Dec. 10, 2019
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`US 10,502,929 B2
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`US 10,502,929 B2
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`US 10,502,929 B2
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`U.S. Patent
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`Sheet 17 of 18
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`US 10
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`502,929 B2
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`EX 2023 Page 18
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`US 10,502,929 B2
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`EX 2023 Page 19
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`1
`OPTICAL IMAGE CAPTURING SYSTEM
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`US 10,502,929 B2
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`CROSS-REFERENCE TO RELATED
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`APPLICATION
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`1. Field of the Invention
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`The present disclosure relates to an optical image captur-
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`ing system, and moreparticularly to a compact optical image
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`capturing system which can be applied to electronic prod-
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`2. Description of the Related Art
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`This application claims priority from Taiwan Patent
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`Application No. 105113328, filed on Apr. 28, 2016, in the
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`Taiwan Intellectual Property Office, the content of which is
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`hereby incorporated by reference in its entirety for all
`purposes.
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`BACKGROUND OF THE INVENTION
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`and to improvetotal pixels and imaging quality for image
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`formation, so as to be applied to minimized electronic
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`products.
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`The term andits definition to the lens element parameter
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`in the embodiment of the present invention are shown as
`below for further reference.
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`The lens element parameterrelated to a length or a height
`in the lens element
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`The height of an image formed by the optical image cap-
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`turing system is denoted by HOI. The height of the optical
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`image capturing system is denoted by HOS. A distance from
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`the object-side surface of the first
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`to the
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`image-side surface of the fourth lens element is denoted by
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`InTL. A distance from the image-side surface of the fourth
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`lens element to an image plane is denoted by InB, where
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`InTL+InB=HOS. A distance from an aperture stop (aperture)
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`to an image plane is denoted by InS. A distance from thefirst
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`lens element to the second lens element is denoted by In12
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`(example). A central thickness ofthe first lens element of the
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`optical image capturing system on the optical axis is denoted
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`by TP1 (example).
`The Lens Element Parameter Related to the Material in
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`the Lens Element
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`In recent years, with therise of portable electronic devices
`An Abbe number of the first lens element in the optical
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`having camera functionalities, the demand for an optical
`image capturing system is denoted by NA1 (example). A
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`image capturing system is raised gradually. The image
`refractive index ofthefirst lens element is denoted by Nd1
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`sensing device of ordinary photographing camera is com-
`(example).
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`The Lens Element Parameter Related to View Angle in the
`monly selected from charge coupled device (CCD) or
`Lens Element
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`complementary metal-oxide semiconductor sensor (CMOS
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`A view angle is denoted by AF. Half of the view angle is
`Sensor). In addition, as advanced semiconductor manufac-
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`denoted by HAF. A major light angle is denoted by MRA.
`turing technology enables the minimization of pixel size of
`The Lens Element Parameter Related to Exit/Entrance
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`the image sensing device, the development of the optical
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`Pupil in the Lens Element
`image capturing system directs towards the field of high
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`An entrance pupil diameter of the optical image capturing
`pixels. Therefore, the requirement for high imaging quality
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`system is denoted by HEP. A maximum effective half
`is rapidly raised.
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`diameter (EHD) of any surface of a single lens element
`The traditional optical image capturing system of a por-
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`refers to a perpendicular height between the optical axis and
`table electronic device comes with different designs, includ-
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`an intersection point where the incident ray with the maxi-
`ing a second-lens or a third-lens design. However,
`the
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`mum view angle passes through the outmost edge of the
`requirement for the higher pixels and the requirement for a
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`entrance pupil and intersects with the surface of the lens
`large aperture of an end user, like functionalities of micro
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`element. For example, the maximum effective half diameter
`filming and night view, or the requirement of wide view
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`ofthe object-side surface ofthe first lens element is denoted
`angle of the portable electronic device have been raised. But
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`by EHD 11. The maximum effective half diameter of the
`the optical image capturing system with the large aperture
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`image-side surface of the first lens element is denoted by
`design often produces more aberration, resulting in the
`45
`EHD 12. The maximum effective half diameter of the
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`deterioration of quality in peripheral image formation and
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`object-side surface of the second lens element is denoted by
`difficulties of manufacturing, and the optical image captur-
`EHD 21. The maximum effective half diameter of the
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`ing system with wide view angle design increases distortion
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`image-side surface of the second lens element is denoted by
`rate in image formation, thus the optical image capturing
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`EHD 22. The maximum effective half diameters of any
`system in prior arts cannot meet the requirement of the
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`surfaces of other lens elements in the optical image captur-
`higher order camera lens module.
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`ing system are denoted in the similar way.
`Therefore, how to effectively increase quantity of incom-
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`The Lens Element Parameter Related to an Arc Length of
`ing light and view angle of the optical lenses, not only
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`the Lens Element Shape and an Outline of Surface
`further improves total pixels and imaging quality for the
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`A length of the maximum effective half diameter outline
`image formation, but also considers the equity design of the
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`curve at any surface of a single lens elementrefers to an arc
`miniaturized optical lenses, becomes a quite importantissue.
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`length of a curve, wherein the curve starts from an axial
`SUMMARY OF THE INVENTION
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`point on the surface of the lens element, travels along the
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`surface outline of the lens element, and ends at the point
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`whichdefines the maximum effective half diameter; and this
`The aspect of embodiment of the present disclosure
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`directs to an optical image capturing system and an optical
`arc length is denoted as ARS. For example, the length of the
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`image capturing lens which use combination of refractive
`maximumeffective half diameter outline curve ofthe object-
`side surface of the first lens element is denoted as ARS11.
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`powers, convex and concave surfaces of four-piece optical
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`lenses (the convex or concave surface in the disclosure
`The length of the maximum effective half diameter outline
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`denotes the geometrical shape of an image-side surface or an
`curve of the image-side surface of the first lens element is
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`object-side surface of each lens on an optical axis) to
`denoted as ARS12. The length of the maximum effective
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`increase the quantity of incoming light of the optical image
`half diameter outline curve of the object-side surface of the
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`capturing system and the view angle of the optical lenses,
`second lens element is denoted as ARS21. The length of the
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`3
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`maximumeffective half diameter outline curve of the image-
`side surface of the second lens element is denoted as ARS22.
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`The lengths of the maximum effective half diameter outline
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`curve of any surface of other lens elements in the optical
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`image capturing system are denoted in the similar way.
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`A length of 2 entrance pupil diameter (HEP) outline
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`curve of any surface of a single lens elementrefers to an arc
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`length of curve, wherein the curve starts from an axial point
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`on the surface of the lens element, travels along the surface
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`outline of the lens element, and endsat a coordinate point on
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`the surface wherethe vertical height from the optical axis to
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`the coordinate point
`is equivalent
`to 2 entrance pupil
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`diameter; and the are length is denoted as ARE. For
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`example, the length of the 4 entrance pupil diameter (HEP)
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`outline curve of the object-side surface of the first lens
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`element is denoted as ARE11. The length of the 12 entrance
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`pupil diameter (HEP) outline curve of the image-side sur-
`face of the first lens element is denoted as ARE12. The
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`length of the 4 entrance pupil diameter (HEP) outline curve
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`of the object-side surface of the second lens element is
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`denoted as ARE21. The length of the 4 entrance pupil
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`diameter (HEP) outline curve of the image-side surface of
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`the second lens element is denoted as ARE22. The lengths
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`of the 2 entrance pupil diameter (HEP) outline curve of any
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`surface of the other lens elements in the optical
`image
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`capturing system are denoted in the similar way.
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`The Lens Element Parameter Related to a Depth of the
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`Lens Element Shape
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`A distance paralleling an optical axis from a maximum
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`effective half diameter position to an axial point on the
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`object-side surface of the fourth lens element is denoted by
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`InRS41 (example). A distance paralleling an optical axis
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`from a maximum effective half diameter position to an axial
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`point on the image-side surface of the fourth lens elementis
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`denoted by InRS42 (example).
`The Lens Element Parameter Related to the Lens Element
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`Shape
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`Accritical point C is a tangent point on a surface of a specific
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`perpendicular to the optical axis and the tangent point cannot
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`be the axial point of the lens element surface. Furthermore,
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`a perpendicular distance betweena critical point C31 on the
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`object-side surface of the third lens element and the optical
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`axis is HVT31 (example). A perpendicular distance between
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`a critical point C32 on the image-side surface of the third
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`lens element and the optical axis is HVT32 (example). A
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`perpendicular distance between a critical point C41 on the
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`object-side surface of the fourth lens element andthe optical
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`axis is HVT41 (example). A perpendicular distance between
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`a critical point C42 on the image-side surface of the fourth
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`lens element and the optical axis is HVT42 (example). The
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`perpendicular distances between the critical point on the
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`image-side surface or object-side surface of other lens
`elements are denoted in similar fashion.
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`The object-side surface of the fourth lens element has one
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`inflection point IF411 which is nearest to the optical axis,
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`and the sinkage value ofthe inflection point IF411 is denoted
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`by SGI411. SGI411 is a horizontal shift distance paralleling
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`the optical axis from an axial point on the object-side surface
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`of the fourth lens element to the inflection point which is
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`nearest to the optical axis on the object-side surface of the
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`fourth lens element. A distance perpendicular to the optical
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`axis between the inflection point IF411 and the optical axis
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`is HIF411 (example). The image-side surface of the fourth
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`lens element has oneinflection point IF421 whichis nearest
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`to the optical axis and the sinkage value of the inflection
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`point IF421 is denoted by SGI421 (example). SGI421 is a
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`horizontal shift distance paralleling the optical axis from an
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`axial point on the image-side surface of the fourth lens
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`element to the inflection point which is nearest to the optical
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`axis on the image-side surface of the fourth lens element. A
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`distance perpendicular to the optical axis between the inflec-
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`tion point IF421 and the optical axis is HIF421 (example).
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`The object-side surface of the fourth lens element has one
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`inflection point IF412 which is the second nearest to the
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`optical axis and the sinkage value of the inflection point
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`IF412 is denoted by SGI412 (example), SGI1412 is a
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`horizontal shift distance paralleling the optical axis from an
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`axial point on the object-side surface of the fourth lens
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`elementto the inflection point whichis the second nearest to
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`the optical axis on the object-side surface of the fourth lens
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`element. A distance perpendicular to the optical axis
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`between the inflection point IF412 and the optical axis is
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`HIF412 (example). The image-side surface of the fourth lens
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`element has oneinflection point IF422 which is the second
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`nearest to the optical axis and the sinkage value of the
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`inflection point IF422 is denoted by SGI422 (example).
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`SGI422 is a horizontal shift distance paralleling the optical
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`axis from an axial point on the image-side surface of the
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`fourth lens element to the inflection point which is second
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`nearest to the optical axis on the image-side surface of the
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`fourth lens element. A distance perpendicular to the optical
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`axis betweenthe inflection point IF4222 andthe optical axis
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`is HIF422 (example).
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`The object-side surface of the fourth lens element has one
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`inflection point IF413 whichis thethird nearestto the optical
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`axis and the sinkage value of the inflection point IF413 is
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`denoted by SG1413 (example). SG1413 is a horizontal shift
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`distance paralleling the optical axis from an axial point on
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`the object-side surface of the fourth lens element to the
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`inflection point which is the third nearest to the optical axis
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`on the object-side surface of the fourth d lens element. A
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`distance perpendicular to the optical axis between the inflec-
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`tion point IF413 and the optical axis is HIF413 (example).
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`The image-side surface of the fourth lens element has one
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`inflection point IF423 whichis thethird nearestto the optical
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`axis and the sinkage value of the inflection point IF423 is
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`denoted by SG1423 (example). SG1423 is a horizontal shift
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`distance paralleling the optical axis from an axial point on
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`the image-side surface of the fourth lens element to the
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`inflection point which is the third nearest to the optical axis
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`on the image-side surface of the fourth lens element. A
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`distance perpendicular to the optical axis between the inflec-
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`tion point IF423 and the optical axis is HIF423 (example).
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`The object-side surface of the fourth lens element has one
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`inflection point IF414 which is the fourth nearest to the
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`optical axis and the sinkage value of the inflection point
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`IF414 is denoted by SGI414 (example). SG1414 is a hori-
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`zontal shift distance paralleling the optical axis from an axial
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`point on the object-side surface of the fourth lens elementto
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`the inflection point which is the fourth nearest to the optical
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`axis on the object-side surface of the fourth lens element. A
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`distance perpendicular to the optical axis between the inflec-
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`tion point IF414 and the optical axis is HIF414 (example).
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`The image-side surface of the fourth lens element has one
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`inflection point IF424 which is the fourth nearest to the
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`optical axis and the sinkage value of the inflection point
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`IF424 is denoted by SG1424 (example). SG1424 is a hori-
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`zontal shift distance paralleling the optical axis from an axial
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`point on the image-side surface of the fourth lens elementto
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`the inflection point which is the fourth nearest to the optical
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`axis on the image-side surface of the fourth lens element. A
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`distance perpendicular to the optical axis between the inflec-
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`tion point IF424 and the optical axis is HIF424 (example).
`EX 2023 Page 21
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`US 10,502,929 B2
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`EX 2023 Page 21
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`US 10,502,929 B2
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`The inflection points on the object-side surface or the
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`image-side surface of the other lens elements and the
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`perpendicular distances between them and the optical axis,
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`or the sinkage values thereof are denoted in the similar way
`described above.
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`The Lens Element Parameter Related to an Aberration
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`Optical distortion for image formation in the optical image
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`capturing system is denoted by ODT. TV distortion for
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`image formation in the optical image capturing system is
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`denoted by TDT. Furthermore, the range of the aberration
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`offset for the view of image formation may be limited to
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`50%-100%. An offset of the spherical aberration is denoted
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`by DFS. An offset of the coma aberration is denoted by DFC.
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`The transverse aberration of the edge of the aperture is
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`defined as STOP Transverse Aberration (STA), which
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`assesses the specific performance of the optical
`image
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`capturing system. The tangential fan or sagittal fan may be
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`applied to calculate the STA of any fields of view, and in
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`particular, to calculate the STAs of the longest operation
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`wavelength (e.g. 650 nm) and the shortest operation wave-
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`length (e.g. 470 nm), which serve as the standard of the
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`performance. The aforementioneddirection of the tangential
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`fan can be further defined as the positive (overhead-light)
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`and negative (lower-light) directions. The STA of the max
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`operation wavelength is defined as the distance between the
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`position of the image formed when the max operation
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`wavelength passing through the edge of the aperture strikes
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`a specific field of view of the image plane and the image
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`position of the reference primary wavelength (e.g. wave-
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`length of 555 nm) on specific field of view of the image
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`plane. Whereas the STA of the shortest operation wave-
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`length is defined as the distance betweenthe position of the
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`image formed whenthe shortest operation wavelength pass-
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`ing through the edge of the aperture strikes a specific field
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`of view of the image plane and the imageposition of the
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`reference primary wavelength on a specific field of view of
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`the imageplane. Thecriteria for the optical image capturing
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`system to be qualified as having excellent performance may
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`be set as: both STA of the incident
`longest operation
`40
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`wavelength and the STA ofthe incident shortest operation
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`wavelength at 70% of the field of view of the image plane
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`(i.e. 0.7 HOT) haveto be less than 100 um or even less than
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`80 pm.
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`image capturing system has a maximum
`The optical
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`image height HOI on the image plane perpendicular to the
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`optical axis. A transverse aberration of the longest operation
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`wavelength of visible light of a positive direction tangential
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`fan of the optical image capturing system passing through an
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