USOO9726858B2
`
`(12) United States Patent
`Huang
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 9,726,858 B2
`Aug. 8, 2017
`
`(54) PHOTOGRAPHING OPTICAL LENS
`ASSEMBLY, IMAGE CAPTURING DEVICE
`AND ELECTRONIC DEVICE
`
`(71) Applicant: LARGAN PRECISION CO.,LTD.,
`Taichung (TW)
`
`(72) Inventor: Hsin-Hsuan Huang, Taichung (TW)
`
`(73) Assignee: LARGAN PRECISION CO.,LTD.,
`Taichung (TW)
`
`(*) Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 91 days.
`(21) Appl. No.: 14/684,590
`(22) Filed:
`Apr. 13, 2015
`
`(65)
`
`(30)
`
`Prior Publication Data
`US 2016/O187622 A1
`Jun. 30, 2016
`
`Foreign Application Priority Data
`
`Dec. 30, 2014 (TW) ................................. 10314.6329
`(51) Int. Cl.
`GO2B 3/02
`GO2B I3/18
`GO2B 9/62
`GO2B I3/00
`H04N 5/225
`H04N 5/232
`GO2B 5/17
`(52) U.S. Cl.
`CPC ........... G02B 13/0045 (2013.01); G02B 9/62
`(2013.01); G02B 13/0015 (2013.01); G02B
`13/18 (2013.01); G02B 15/17 (2013.01);
`H04N 5/2254 (2013.01); H04N 5/232
`(2013.01)
`
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`
`
`
`(58) Field of Classification Search
`CPC ...... G02B 9/62; G02B 13/0045; G02B 13/18;
`G02B 13/0015; G02B 15/17; H04N
`5/2254; H04N 5/232
`USPC ................ 359/708, 713, 756, 757, 758, 760
`See application file for complete search history.
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`4, 1950 Warmisham
`2,502,543 A
`6/1997 Kaneko et al.
`5,642,229 A
`8/2010 Asami et al.
`7,787,196 B2
`2/2011 Suzuki et al.
`7,889,442 B2
`2/2013 Huang et al.
`8,379,323 B2
`8,861,095 B2 10/2014 Kubota et al.
`(Continued)
`
`FOREIGN PATENT DOCUMENTS
`
`JP
`JP
`
`6, 1973
`48043328
`11, 1978
`53129629
`(Continued)
`Primary Examiner — Bumsuk Won
`Assistant Examiner — Collin X Beatty
`(74) Attorney, Agent, or Firm — McClure, Qualey &
`Rodack, LLP
`ABSTRACT
`(57)
`A photographing optical lens assembly includes, in order
`from an object side to an image side, a first lens element, a
`second lens element, a third lens element, a fourth lens
`element, a fifth lens element and a sixth lens element. The
`first lens element with positive refractive power has an
`object-side Surface being convex in a paraxial region
`thereof. The second lens element has refractive power. Each
`of the third through sixth lens elements has refractive power
`and an object-side Surface and an image-side Surface being
`both aspheric. The photographing optical lens assembly has
`a total of six lens elements with refractive power.
`32 Claims, 21 Drawing Sheets
`
`APPL-1006 / Page 1 of 44
`APPLE INC. v. COREPHOTONICS LTD.
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`

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`US 9,726,858 B2
`Page 2
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`2015,0085378 A1
`2015.0109685 A1
`
`2015, 0146086 A1
`2015,024.7989 A1
`2015,024801.6 A1
`2015,0277085 A1
`2016,0170182 A1
`
`3/2015 Jung et al.
`4/2015 Shinohara ................ GO2B 9/60
`359,714
`
`5, 2015 Liao
`9, 2015 Sakai
`9, 2015 Sakai
`10, 2015 Noda
`6, 2016 Tanaka
`
`FOREIGN PATENT DOCUMENTS
`
`JP
`4f1979
`54044554 A
`JP
`58215619 A 12/1983
`JP
`1986-067814
`4f1986
`JP
`S61-67814 A
`4f1986
`JP
`HO2-59735. A
`2, 1990
`JP
`HO7-841.83 A
`3, 1995
`JP
`O7181380 A
`7, 1995
`JP
`10325921 A 12/1997
`JP
`10307254. A 11, 1998
`JP
`2009069369 A
`4/2009
`JP
`2013-242449 A 12/2013
`JP
`2014-0 10399
`1, 2014
`JP
`2014092583 A
`5, 2014
`TW
`2014 15070 A
`4/2014
`WO
`2014-155468 A1
`10, 2014
`* cited by examiner
`
`APPL-1006 / Page 2 of 44
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`U.S. Patent
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`Aug. 8, 2017
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`U.S. Patent
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`Aug. 8, 2017
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`U.S. Patent
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`U.S. Patent
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`Aug. 8, 2017
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`U.S. Patent
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`Aug. 8, 2017
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`U.S. Patent
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`Aug. 8, 2017
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`U.S. Patent
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`Aug. 8, 2017
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`Aug. 8, 2017
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`U.S. Patent
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`Aug. 8, 2017
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`US 9,726,858 B2
`
`1.
`PHOTOGRAPHING OPTICAL LENS
`ASSEMBLY, IMAGE CAPTURING DEVICE
`AND ELECTRONIC DEVICE
`
`RELATED APPLICATIONS
`
`This application claims priority to Taiwan Application
`Serial Number 103146329, filed Dec. 30, 2014, which is
`herein incorporated by reference.
`
`BACKGROUND
`
`2
`among the lens elements with refractive power. When a
`focal length of the photographing optical lens assembly is f.
`an axial distance between the object-side surface of the first
`lens element and the image-side Surface of the sixth lens
`element is TD, an axial distance between the image-side
`Surface of the sixth lens element and an image surface is BL,
`and a maximum image height of the photographing optical
`lens assembly is ImgH, the following conditions are satis
`fied:
`
`2.0<f ImgH35.0.
`According to another aspect of the present disclosure, an
`image capturing device includes the photographing optical
`lens assembly according to the aforementioned aspect and
`an image sensor, wherein the image sensor is disposed on the
`image Surface of the photographing optical lens assembly.
`According to further another aspect of the present disclo
`Sure, an electronic device includes the image capturing
`device according to the aforementioned aspect.
`According to yet another aspect of the present disclosure,
`a photographing optical lens assembly includes, in order
`from an object side to an image side, a first lens element, a
`second lens element, a third lens element, a fourth lens
`element, a fifth lens element, and a sixth lens element. The
`first lens element with positive refractive power has an
`object-side Surface being convex in a paraxial region
`thereof. The second lens element has refractive power. The
`third lens element with refractive power has an object-side
`Surface and an image-side surface being both aspheric. The
`fourth lens element with refractive power has an object-side
`Surface and an image-side surface being both aspheric. The
`fifth lens element with refractive power has an object-side
`Surface and an image-side surface being both aspheric. The
`sixth lens element with refractive power has an object-side
`Surface and an image-side surface being both aspheric. The
`photographing optical lens assembly has a total of six lens
`elements with refractive power, there is an air space between
`any two lens elements of the first lens element, the second
`lens element, the third lens element, the fourth lens element,
`the fifth lens element and the sixth lens element that are
`adjacent to each other, and there is no relative displacement
`among the lens elements with refractive power. The photo
`graphing optical lens assembly further includes an aperture
`stop, there is no lens element with refractive power between
`the aperture stop and the first lens element. When a focal
`length of the photographing optical lens assembly is f an
`axial distance between the object-side surface of the first
`lens element and the image-side Surface of the sixth lens
`element is TD, and a maximum image height of the photo
`graphing optical lens assembly is ImgH, the following
`conditions are satisfied:
`
`0.30<TD/f-0.90; and
`
`2.0<f ImgH35.0.
`According to still another aspect of the present disclosure,
`an image capturing device includes the photographing opti
`cal lens assembly according to the aforementioned aspect, a
`prism and an image sensor, wherein the prism is disposed on
`an optical path between an imaged object and the photo
`graphing optical lens assembly, and the image sensor is
`disposed on the image surface of the photographing optical
`lens assembly.
`
`Technical Field
`The present disclosure relates to a photographing optical
`lens assembly and an image capturing device. More particu
`larly, the present disclosure relates to a compact photograph
`ing optical lens assembly and image capturing device appli
`cable to electronic devices.
`Description of Related Art
`In recent years, with the popularity of mobile terminals
`having camera functionalities, the demand of miniaturized
`optical systems has been increasing. The sensor of a con
`ventional optical system is typically a CCD (Charge
`Coupled Device) or a CMOS (Complementary Metal-OX
`ide-Semiconductor) sensor. As the advanced semiconductor
`manufacturing technologies have allowed the pixel size of
`sensors to be reduced and compact optical systems have
`gradually evolved toward the field of higher megapixels,
`there is an increasing demand for compact optical systems
`featuring better image quality.
`A conventional optical system employed in a portable
`electronic product mainly adopts a four-element lens struc
`ture or a five-element lens structure. Due to the popularity of
`mobile terminals with high-end specifications, such as Smart
`phones, tablet personal computers and wearable apparatus,
`the requirements for high resolution and image quality of
`present compact optical systems increase significantly.
`However, the conventional optical systems cannot satisfy
`these requirements of the compact optical systems.
`Other conventional compact optical systems with six
`element lens structure enhance image quality and resolution.
`However, the arrangement of the refractive power of the first
`lens element of the conventional compact optical systems
`cannot provide the light focusing ability on the object side
`thereof. Therefore, the volume and the total track length
`would be excessive.
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`SUMMARY
`
`According to one aspect of the present disclosure, a
`photographing optical lens assembly includes, in order from
`an object side to an image side, a first lens element, a second
`lens element, a third lens element, a fourth lens element, a
`fifth lens element, and a sixth lens element. The first lens
`element with positive refractive power has an object-side
`Surface being convex in a paraxial region thereof. The
`second lens element has refractive power. The third lens
`element with refractive power has an object-side surface and
`an image-side Surface being both aspheric. The fourth lens
`element with refractive power has an object-side surface and
`an image-side Surface being both aspheric. The fifth lens
`element with refractive power has an object-side surface and
`an image-side Surface being both aspheric. The sixth lens
`element with refractive power has an object-side surface and
`an image-side Surface being both aspheric. The photograph
`ing optical lens assembly has a total of six lens elements
`with refractive power, and there is no relative displacement
`
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`US 9,726,858 B2
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`3
`According to further another aspect of the present disclo
`Sure, a photographing optical lens assembly includes, in
`order from an object side to an image side, a first lens
`element, a second lens element, a third lens element, a fourth
`lens element, a fifth lens element, and a sixth lens element.
`The first lens element with positive refractive power has an
`object-side Surface being convex in a paraxial region
`thereof. The second lens element has negative refractive
`power. The third lens element with refractive power has an
`object-side Surface and an image-side Surface being both
`aspheric. The fourth lens element with refractive power has
`an object-side Surface and an image-side Surface being both
`aspheric. The fifth lens element with refractive power has an
`object-side Surface and an image-side Surface being both
`aspheric. The sixth lens element with refractive power has
`an object-side Surface and an image-side Surface being both
`aspheric. The photographing optical lens assembly has a
`total of six lens elements with refractive power, and there is
`no relative displacement among the lens elements with
`refractive power. When a focal length of the photographing
`optical lens assembly is f an axial distance between the
`object-side Surface of the first lens element and the image
`side surface of the sixth lens element is TD, and an axial
`distance between the image-side Surface of the sixth lens
`element and an image Surface is BL, the following condi
`tions are satisfied:
`0.30<TD/f-0.85; and
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`The invention can be more fully understood by reading
`the following detailed description of the embodiment, with
`reference made to the accompanying drawings as follows:
`FIG. 1 is a schematic view of an image capturing device
`according to the 1st embodiment of the present disclosure;
`FIG. 2 shows spherical aberration curves, astigmatic field
`curves and a distortion curve of the image capturing device
`according to the 1st embodiment;
`FIG. 3 is a schematic view of an image capturing device
`according to the 2nd embodiment of the present disclosure;
`FIG. 4 shows spherical aberration curves, astigmatic field
`curves and a distortion curve of the image capturing device
`according to the 2nd embodiment;
`FIG. 5 is a schematic view of an image capturing device
`according to the 3rd embodiment of the present disclosure;
`FIG. 6 shows spherical aberration curves, astigmatic field
`curves and a distortion curve of the image capturing device
`according to the 3rd embodiment;
`FIG. 7 is a schematic view of an image capturing device
`according to the 4th embodiment of the present disclosure;
`FIG. 8 shows spherical aberration curves, astigmatic field
`curves and a distortion curve of the image capturing device
`according to the 4th embodiment;
`FIG. 9 is a schematic view of an image capturing device
`according to the 5th embodiment of the present disclosure;
`FIG. 10 shows spherical aberration curves, astigmatic
`field curves and a distortion curve of the image capturing
`device according to the 5th embodiment;
`FIG. 11 is a schematic view of an image capturing device
`according to the 6th embodiment of the present disclosure;
`FIG. 12 shows spherical aberration curves, astigmatic
`field curves and a distortion curve of the image capturing
`device according to the 6th embodiment;
`FIG. 13 is a schematic view of an image capturing device
`according to the 7th embodiment of the present disclosure;
`
`4
`FIG. 14 shows spherical aberration curves, astigmatic
`field curves and a distortion curve of the image capturing
`device according to the 7th embodiment;
`FIG. 15 is a schematic view of an image capturing device
`according to the 8th embodiment of the present disclosure;
`FIG. 16 shows spherical aberration curves, astigmatic
`field curves and a distortion curve of the image capturing
`device according to the 8th embodiment;
`FIG. 17 shows a schematic view of the parameters Dsr1
`and Dsr2 according to the 1st embodiment of FIG. 1;
`FIG. 18 shows a schematic view of one arrangement of
`the photographing optical lens assembly, an object and the
`image Surface according to the 1st embodiment of FIG. 1;
`FIG. 19 shows a schematic view of another arrangement
`of the photographing optical lens assembly, a prism, an
`object and the image Surface according to the 1st embodi
`ment of FIG. 1;
`FIG. 20 is a schematic view of an electronic device
`according to the 9th embodiment of the present disclosure;
`FIG. 21 is a schematic view of an electronic device
`according to the 10th embodiment of the present disclosure;
`and
`FIG. 22 is a schematic view of an electronic device
`according to the 11th embodiment of the present disclosure.
`
`DETAILED DESCRIPTION
`
`A photographing optical lens assembly includes, in order
`from an object side to an image side, a first lens element, a
`second lens element, a third lens element, a fourth lens
`element, a fifth lens element and a sixth lens element,
`wherein the photographing optical lens assembly has a total
`of six lens elements with refractive power, and there is no
`relative displacement among the lens elements with refrac
`tive power. The photographing optical lens assembly further
`includes a stop. Such as an aperture stop, wherein there is no
`lens element with refractive power between the stop and the
`first lens element.
`There is an air space between any two lens elements of the
`first lens element, the second lens element, the third lens
`element, the fourth lens element, the fifth lens element and
`the sixth lens element that are adjacent to each other. That is,
`each of the first through sixth lens elements is a single and
`non-cemented lens element, and any two lens elements
`adjacent to each other are not cemented, and there is a space
`between the two lens elements. Moreover, the manufactur
`ing process of the cemented lenses is more complex than the
`non-cemented lenses. In other words, of the first lens ele
`ment, the second lens element, the third lens element, the
`fourth lens element, the fifth lens element and the sixth lens
`element of the photographing optical lens assembly, there is
`a space in a paraxial region between every pair of lens
`elements that are adjacent to each other. In particular, a
`second Surface of one lens element and a first Surface of the
`following lens element need to have accurate curvature to
`ensure these two lens elements will be highly cemented.
`However, during the cementing process, those two lens
`elements might not be highly cemented due to displacement
`and it is thereby not favorable for the image quality of the
`photographing optical lens assembly. Therefore, according
`to the photographing optical lens assembly of the present
`disclosure, an air space in a paraxial region between any two
`of the first lens element, the second lens element, the third
`lens element, the fourth lens element, the fifth lens element
`and the sixth lens element that are adjacent to each other of
`the present disclosure improves the problem generated by
`the cemented lens elements.
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`US 9,726,858 B2
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`The first lens element with positive refractive power has
`an object-side Surface being convex in a paraxial region
`thereof. Therefore, it is favorable for restricting the volume
`of the photographing optical lens assembly so as to obtain
`the compact size thereof by providing the light focusing
`ability on the object side thereof. Furthermore, the first lens
`element can have an image-side Surface being convex in a
`paraxial region thereof and including at least one concave
`shape in an off-axial region thereof, so that the aberration of
`the off-axis field can be corrected.
`The second lens element can have negative refractive
`power, and can have an image-side Surface being concave in
`a paraxial region thereof. Therefore, the aberration of the
`photographing optical lens assembly can be corrected for
`enhancing the image quality.
`The third lens element can have negative refractive
`power, and can have an image-side Surface being concave in
`a paraxial region thereof. Therefore, the aberration of the
`photographing optical lens assembly can be corrected for
`enhancing the image quality.
`The fifth lens element can have positive refractive power,
`and can have an object-side Surface being concave in a
`paraxial region thereof and an image-side Surface being
`convex in a paraxial region thereof. Therefore, the astigma
`tism of the photographing optical lens assembly can be
`reduced effectively.
`The sixth lens element can have negative refractive
`power, and can have an object-side Surface being concave in
`a paraxial region thereof and an image-side Surface being
`convex in a paraxial region thereof, wherein the object-side
`Surface of the sixth lens element can include at least one
`convex shape in an off-axial region thereof. Therefore, the
`principal point can be positioned away from the image
`Surface of the photographing optical lens assembly so as to
`reduce the back focal length for keeping a compact size.
`Further, it is also favorable for reducing the incident angle
`of the off-axis field onto the image sensor So as to increase
`the responding efficiency of the image sensor.
`According to the foregoing photographing optical lens
`assembly, at least two lens elements of the first lens element,
`the second lens element and the third lens element has an
`object-side Surface being convex in a paraxial region thereof
`and an image-side Surface being concave in a paraxial region
`thereof. Therefore, the astigmatism of the photographing
`optical lens assembly can be corrected.
`According to the foregoing photographing optical lens
`assembly, each of the fourth lens element, the fifth lens
`element and the sixth lens element has a surface being
`concave in a paraxial region thereof and the other Surface
`being convex in a paraxial region thereof. Therefore, the
`refractive power of the photographing optical lens assembly
`can be balanced and then the aberration thereof can be also
`corrected.
`When a focal length of the photographing optical lens
`assembly is f, and an axial distance between the object-side
`Surface of the first lens element and the image-side Surface
`of the sixth lens element is TD, the following condition is
`satisfied: 0.30<TD/f-0.90. It is favorable for controlling the
`arrangement of the lens elements effectively, and improving
`the telephoto ability. Preferably, the following condition can
`be satisfied: 0.30<TD/f-0.85. More preferably, the follow
`ing condition can be satisfied: 0.50<TD/f-0.85.
`When the focal length of the photographing optical lens
`assembly is f, and an axial distance between the image-side
`Surface of the sixth lens element and an image Surface is BL,
`and the following condition is satisfied: 0<BL/f-0.25.
`Therefore, the back focal length of the photographing opti
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`cal lens assembly can be reduced so as to avoid the excessive
`volume thereof which can thereby be favorable to be applied
`to the compact electronic device.
`When the focal length of the photographing optical lens
`assembly is f, and a maximum image height of the photo
`graphing optical lens assembly is ImgH, the following
`condition is satisfied: 2.0<f/ImgH-5.0. Therefore, it is
`favorable for enhancing the image capturing ability on a
`specific region and obtaining the excellent telephoto ability
`by controlling the incident light of the photographing optical
`lens assembly which can be focused on the specific region
`in the distance. Preferably, the following condition can be
`satisfied: 2.35<f/ImgH<4.5.
`When a refractive index of the first lens element is N1, a
`refractive index of the second lens element is N2, a refrac
`tive index of the third lens element is N3, a refractive index
`of the fourth lens element is N4, a refractive index of the
`fifth lens element is N5, a refractive index of the sixth lens
`element is N6, and a maximum of N1, N2, N3, N4, N5 and
`N6 is Nimax, the following condition is satisfied:
`Nmax<1.70. Therefore, the aberration of the photographing
`optical lens assembly can be reduced.
`When an Abbe number of the fifth lens element is V5, the
`following condition is satisfied: V5<30. Therefore, the chro
`matic aberration of the optical photographing lens assembly
`can be corrected.
`The optical photographing lens assembly can further
`include an aperture stop, wherein there is no lens element
`with refractive power between the aperture stop and the first
`lens element. When an axial distance between the aperture
`stop and the image-side Surface of the sixth lens element is
`SD, and the axial distance between the object-side surface of
`the first lens element and the image-side surface of the sixth
`lens element is TD, the following condition is satisfied:
`0.75<SD/TD-1.0. Therefore, it is favorable for obtaining a
`balance between telecentricity and the functionality of wide
`Viewing angle.
`When a distance in parallel with an optical axis from an
`axial vertex on the image-side Surface of the sixth lens
`element to a maximum effective radius position on the
`image-side surface of the sixth lens element is SAG62, and
`a central thickness of the sixth lens element is CT6, the
`following condition is satisfied: SAG62+CT6-0 mm. There
`fore, the shape of the lens element is favorable for manu
`facturing and molding the lens elements.
`When a curvature radius of the image-side surface of the
`fifth lens element is R10, a curvature radius of the object
`side surface of the sixth lens element is R11, and the
`following condition is satisfied: 1.0<(R10+R11)/(R10-R11)
`<8.0. Therefore, the astigmatism can be reduced.
`When the focal length of the photographing optical lens
`assembly is f, a focal length of the first lens element is fl,
`a focal length of the second lens element is f2, and a focal
`length of the sixth lens element is fé, the following condition
`is satisfied: 5.0<|ffl|+|f7f2|+|f7f6. Therefore, the total track
`length of the photographing optical lens assembly can be
`reduced by the distribution of the refractive power so as to
`maintain the compact size thereof.
`When an entrance pupil diameter of the photographing
`optical lens assembly is EPD, and the maximum image
`height of the photographing optical lens assembly is ImgH.
`the following condition is satisfied: 0.8<EPD/ImgH-2.0.
`Therefore, the sufficient light of the photographing optical
`lens assembly can be obtained.
`When half of a maximal field of view of the photograph
`ing optical lens assembly is HFOV, the following condition
`is satisfied: 7.5 degrees<HFOV<23.5 degrees. Therefore,
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`US 9,726,858 B2
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`the proper field of view and the proper image capturing
`range can be obtained for avoiding the stray light.
`When a curvature radius of the object-side surface of the
`fourth lens element is R7, and a curvature radius of the
`image-side surface of the fourth lens element is R8, the
`following condition is satisfied: -0.3<(R7-R8)/(R7+R8)
`<0.6. Therefore, the astigmatism of the photographing opti
`cal lens assembly can be corrected.
`When an axial distance between the aperture stop and the
`object-side surface of the first lens element is DSrl, and an
`axial distance between the aperture stop and an image-side
`surface of the first lens element is Dsr2, the following
`condition is satisfied: 1.40<IDsr1/Dsr2. Therefore, the light
`focusing ability of the first lens element can be enhanced.
`When an axial distance between the object-side surface of
`the first lens element and the image Surface is TL, and a
`maximum image height of the photographing optical lens
`assembly is ImgH, the following condition is satisfied:
`2.0<TL/ImgH3.0. Therefore, the total track length of the
`photographing optical lens assembly can be reduced so as to
`maintain the compact size thereof.
`When the axial distance between the object-side surface
`of the first lens element and the image-side surface of the
`sixth lens element is TD, and an axial distance between the
`image-side surface of the third lens element and the object
`side surface of the fifth lens element is Drór9, the following
`condition is satisfied: TD/Drôr9<3.1. Therefore, the total
`track length of the photographing optical lens assembly can
`be reduced so as to maintain the compact size thereof.
`When a curvature radius of the object-side surface of the
`sixth lens element is R11, and a curvature radius of the
`image-side surface of the sixth lens element is R12, the
`following condition is satisfied: (R11+R12)/(R11-R12)<-
`1.0. Therefore, the photosensitivity of the photographing
`optical lens assembly can be reduced effectively.
`When a sum of axial distances between each two lens
`elements of the first lens element, the second lens element,
`the third lens element, the fourth lens element, the fifth lens
`element and the sixth lens element which are adjacent to
`each other is XAT, and the axial distance between the
`object-side Surface of the first lens element and the image
`side surface of the sixth lens element is TD, the following
`condition is satisfied: 0.40<XATITD. Therefore, the total
`track length of the photographing optical lens assembly can
`be reduced so as to maintain the compact size thereof.
`When the focal length of the photographing optical lens
`assembly is f, a curvature radius of the object-side surface of
`the first lens element is R1, and a curvature radius of the
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`image-side surface of the sixth lens element is R12, the
`following condition is satisfied: 4.0<f7R1-f7R12<8.5.
`Therefore, the back focal length of the photographing opti
`cal lens assembly can be reduced for maintaining the com
`pact size thereof.
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`According to the photographing optical lens assembly of
`the present disclosure, the lens elements thereof can be made
`of glass or plastic material. When the lens elements are made
`of glass material, the distribution of the refractive powers of
`the photographing optical lens assembly may be more
`flexible to design. When the lens elements are made of
`plastic material, the manufacturing cost can be effectively
`reduced. Furthermore, surfaces of each lens element can be
`arranged to be aspheric, since the aspheric Surface of the lens
`element is easy to form a shape other than spherical Surface
`so as to have more controllable variables for eliminating the
`aberration thereof, and to further decrease the required
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`number of the lens elements. Therefore, the total track length
`of the photographing optical lens assembly can also be
`reduced.
`According to the photographing optical lens assembly of
`the present di