Certification of Translation
`
`
`
`
`
`I, Teresa Sumiyoshi, do hereby certify that:
`
`
`
`1. I am fluent in the English and Japanese languages, and have worked as an interpreter and
`translator of these two languages for over 25 years.
`
`
`
`2. The attached English translation is a true and accurate translation of the original Japanese
`document, identified as WO 2013/145989 A1.
`
` I
`
` declare under penalty of perjury under the laws of the United States of America and the State of
`California that the foregoing are true and correct and that this Certification was executed on this
`12th day of August, 2020, in Moraga, California.
`
`I declare that these statements are made with the knowledge that willful false statements and the
`like so made are punishable by fine or imprisonment, or both, under Section 1001 of Title 18 of
`the United States Code.
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`____________________________
`
`Teresa Sumiyoshi
`
`
`
`AOET, Ex. 1006
`Page 1
`
`

`

`(12) International Application Published Under The Patent Cooperation Treaty
`(19) World Intellectual Property Organization International Bureau
`(10) International Publication Number
`WO 2013/145989 Al
`(43) International Publication Date October 3, 2013 (03.10.2013)
`WIPO|PCT
`
`(51) International Patent Classification:
`G02B 13/04 (2006.01) G02B 13/18 (2006.01)
`(21) International Application Number: PCT/JP2013/054632
`(22) International Filing Date: February 23, 2013 (23.02.2013)
`(25) Filing Language: Japanese
`(26) Publication Language: Japanese
`JP
`(30) Priority Data: 2012-073037 March 28, 2012 (28.03.2012)
`(71) Applicant (for all designated countries excluding the United States):
`Konica Minolta, Inc. [JP/JP]; 7-2, 2-chome Marunouchi, Chiyoda-ku, Tokyo
`1007015 (JP)
`(72) Inventor and Applicant (for United States only): Kawasaki, Takashi
`[JP/JP]; 2970 Ishikawa-cho, Hachioji-shi, Tokyo 1928505; c/o Konica
`Minolta Advanced Layers, Inc. (JP)
`(74) Agent: Tamura, Keijiro et al; 8th Floor, Masumoto Building, 4-3, 7-chome
`Nishi-shinjuku, Shinjuku-ku, Tokyo 1600023 (JP)
`
`
`(81) Designated Countries (unless otherwise indicated, for every kind of
`national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA,
`BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE,
`DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR,
`HU, ID, IL, IN, IS, JP, KE, KG, KM, KN, KP, KR, KZ, LA, LC, LK, LR,
`LS, LT, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI,
`NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SC, SD, SE,
`SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US,
`UZ, VC, VN, ZA, ZM, ZW
`(84) Designated Countries (unless otherwise indicated, for every kind of
`regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW,
`MZ, NA, RW, SD, SL, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG,
`KZ, RU, TJ, TM), Europe (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES,
`FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO,
`PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM,
`GA, GN, GQ, GW, ML, MR, NE, SN, TD, TG)
`
`
`Published:
`- with international search report (Article 21(3))
`
`
`
`
`
`[TN: Original document includes the title and abstract in both Japanese
`and English. The following is a translation of the Japanese.]
`
`(54) Title: imaging lens, imaging device, and portable terminal
`
`AOET, Ex. 1006
`Page 2
`
`

`

`
`(57) Abstract:
`Provided is an imaging lens with a three-lens configuration that, for a
`wide-angle bright lens which has a field angle of 65° or greater and an F-
`number of three or less, corrects various aberrations while having lower
`error sensitivity, better moldability, etc., than conventional types. Also
`provided are an imaging device and a portable terminal which use said
`imaging lens. The imaging lens comprises, in order from the object side, a
`first lens, an aperture stop, a second lens, and a third lens. The first
`lens is a positive lens with a convex object-side face. The second lens is
`a positive meniscus lens with a concave object-side face. The third lens
`is a negative lens with an image-side face which is concave near the
`optical axis, has an inflection point within an effective radius, and is
`an aspheric face which becomes a convex face at the periphery of the lens.
`The imaging lens satisfies the following conditional expressions:
`-5.0 < r3/f < -0.4 (1) and
`0.0 < f1/f2 < 5.0 (2),
`where r3 is the radius of curvature (mm) of the second lens object-side
`face, f is the focal length (mm) of the entire system, f1 is the focal
`length (mm) of the first lens, and f2 is the focal length (mm) of the
`second lens.
`
`
`
`
`AOET, Ex. 1006
`Page 3
`
`

`

`1
`
`Specification
`
`Title of the Invention: Imaging lens, imaging device, and portable
`terminal
`Technical field
`[0001]
`The present invention relates to an imaging lens suitable for an imaging
`device using a solid-state imaging element such as a Charge Coupled Device
`(CCD) type image sensor or a Complementary Metal Oxide Semiconductor
`(CMOS) type image sensor, and to an imaging device and a portable terminal
`using said lens.
`[Background Technology]
`[0002]
`In recent years, in conjunction with the increase in performance and
`miniaturization of imaging elements using a solid-state imaging element
`such as a CCD (Charge Coupled Device) type image sensor or a CMOS
`(Complementary Metal Oxide Semiconductor) type image sensor, portable
`phones and portable information terminals equipped with an imaging device
`are becoming widespread. In addition, there is an increasing demand for
`further miniaturization and higher performance of imaging lenses mounted
`on these imaging devices. Recently, there are many cases in which such
`portable terminals incorporate two cameras: a high pixel, a high
`performance main camera; and a compact low pixel sub-camera.
`[0003]
`Because of the need for high performance, imaging lenses with a
`configuration of three to five lenses have been proposed as imaging lenses
`for use in a main camera. Meanwhile, for the sub-camera, the number of
`pixels has generally been in the VGA class until now, and the main imaging
`lenses have had a configuration of one to two lenses. However, most
`recently, in conjunction with an increase in size and increased resolution
`of image display elements in portable terminals, increasing pixels to the
`2M class is progressing even for sub-cameras, and the performance demanded
`of imaging devices is increasing. Therefore, proposed is an imaging lens
`with a three-lens configuration, which is capable of higher performance
`compared to a one or two-lens configuration. However, because a three-lens
`configuration has more elements than a two-lens configuration, there is
`significant performance degradation due to an accumulation of
`manufacturing errors of the elements, so manufacturing must be carried out
`with higher accuracy than for an imaging lens with a two-lens
`configuration, and increasing performance is difficult. Therefore, in the
`optical design of and imaging lens with a three-lens configuration, there
`is a demand for designs which have low error sensitivity and which are
`exceptional from a productivity perspective. Imaging lenses with a
`positive-positive-negative configuration, as in patent documents 1 and 2,
`are known as imaging lenses with a three-lens configuration.
`
`
`
`AOET, Ex. 1006
`Page 4
`
`

`

`2
`
`
`Prior art documents
`[Patent documents]
`[0004]
`Patent document 1: JP 2004-326097A
`Patent document 2: JP 2007-322561A
`Summary of the invention
`Problem to be solved by the invention
`[0005]
`However, in the imaging lens described in Patent Document 1, the
`curvature of the object-side face of the second lens is too strong, so
`a large one-sided blur occurs when the optical surface is decentered
`from the optical axis. Accordingly, it becomes necessary to accurately
`manage the eccentricity that occurs between the optical axes of the
`first lens and the second lens, and there are concerns with
`productivity. In addition, in the imaging lens described in Patent
`Document 2, the curvature of the object-side face of the second lens
`is similarly too strong, so axial coma aberration generated when the
`optical surface is decentered from the optical axis is large, and
`there are concerns with productivity. Further, in the technology
`disclosed in both of Patent Documents 1 and 2, when an imaging lens
`with a maximum image height of two mm or less is used, the thickness
`of the lens becomes too thin and lens molding becomes difficult.
`[0006]
`The present invention was created in view of such problems, and with
`the purpose of providing: an imaging lens with a three-lens
`configuration that, for a wide-angle bright lens which has a field
`angle of 65° or greater and an F-number of three or less, corrects
`various aberrations while having lower error sensitivity, better
`moldability, etc., than conventional types; and an imaging device and
`a portable terminal which use said imaging lens.
`[0007]
`Here, although it is a measure of a small imaging lens, the present
`invention aims for miniaturization of a level satisfying the following
`expression. By satisfying this range, it becomes possible to reduce
`the size and weight of the entire imaging device.
`TTL/2Y < 1.10 ... (14)
`[0008]
`Here, the image-side focal point refers to an image point when a
`parallel light beam parallel to the optical axis is incident to the
`imaging lens.
`
`
`
`
`AOET, Ex. 1006
`Page 5
`
`

`

`3
`
`Note that when a parallel plate such as an optical low-pass filter, an
`infrared cut filter, or a sealing glass of a solid state imaging
`element package is disposed between the face closest to an image of
`the imaging lens and an image-side focal point position, the parallel
`plate portion is defined as an air equivalent distance and the value
`of L is calculated. In addition, more preferably, the following range
`is good:
`TTL/2Y < 1.00 ... (14)'
`Means for solving the problem
`[0009]
`The imaging lens set forth in claim 1 has a maximum image height field
`angle of 65° or greater and an F-number of three or less, and comprises,
`in order from the object side, a first lens, an aperture stop, a second
`lens, and a third lens, wherein:
`the first lens is a positive lens with a convex object-side face;
`the second lens is a positive meniscus lens with a concave object-
`side face;
`the third lens is a negative lens with an image-side face which is
`concave near the optical axis, has an inflection point within an effective
`radius, and is an aspheric face which becomes a convex face at the
`periphery of the lens; and
`the imaging lens satisfies the following conditional expressions
`-5.0 < r3/f < -0.4 ... (1)
` 0.0 < f1/f2 < 5.0 ... (2)
`where
`r3: radius of curvature (mm) of the second lens object-side face,
`f: focal length (mm) of the entire system,
`f1: focal length (mm) of the first lens,
`f2: focal length (mm) of the second lens.
`[0010]
`By disposing, on the side closest to an object, as the first lens, a
`positive lens (a lens having a positive power) with a convex surface
`directed toward the object side, it is possible to bring the principal
`point position toward the object side, so the total length of the lens
`can be shortened. In addition, by disposing the aperture stop between
`the first lens and the second lens, it is possible to adopt a
`configuration in which the first lens and the second lens are nearly
`symmetrical with the aperture stop sandwiched therebetween, so is
`advantageous for aberration correction.
`
`
`
`AOET, Ex. 1006
`Page 6
`
`

`

`4
`
`[0011]
`In addition, by disposing, as the second lens, a meniscus lens with a
`concave surface directed toward the object side, it is possible to
`reduce the light beam incidence angle to the second lens object-side
`face and the image-side face, and thus it is possible to suppress the
`occurrence of aberration. Furthermore, by making the second lens a
`positive lens, the second lens can share the burden of positive power
`which tends to be biased to the first lens when the total length is
`shortened, and aberration correction can be improved even if the angle
`is widened.
`[0012]
`In addition, by disposing, as the third lens, a negative lens (a lens
`having a negative power) having a concave surface near the optical
`axis of the image side face, it is possible to ensure a back focus to
`some extent, and at the same time, it is possible to achieve good
`telecentric characteristics of the peripheral light beam by using an
`aspherical surface which has an inflection point and which becomes a
`convex face at the periphery.
`[0013]
`To achieve, with a three-lens configuration in which an aperture stop
`is present between a first lens and a second lens, an imaging lens
`which has a wide angle, with a maximum image height field angle of 65°
`or greater, and has a small overall optical length while having a
`brightness of F3 or less, it is necessary to have strong positive
`power more on the object side, and it is necessary to increase the
`radius of curvature for the optical surface of each lens from the
`viewpoint of lowering error sensitivity. Accordingly, when the first
`lens and the second lens are regarded as one lens group, it is
`necessary for the group to have a strong positive power, and from the
`viewpoint of correcting aberration and reducing the error sensitivity,
`it is desirable that the positive power be shared between the first
`lens and the second lens. Conditional Expression (2) is a conditional
`expression of the power ratio of the first lens and the second lens.
`If the power of the first lens increases as the value of the
`conditional expression (2) drops further below the lower limit, the
`eccentricity error sensitivity of the first lens becomes very high,
`and there is a concern about productivity deteriorating. In addition,
`if the power of the second lens increases as the value of the
`conditional expression (2) further exceeds the upper limit,
`eccentricity error sensitivity of the second lens similarly becomes
`very high, and there is a concern about productivity deteriorating. By
`satisfying Conditional Expression (2), it is possible to improve
`performance even for a wide-angle and bright lens while suppressing
`the eccentricity error sensitivity of the first lens and the second
`lens.
`
`AOET, Ex. 1006
`Page 7
`
`

`

`[0014]
`Conditional expression (1) is a conditional expression for defining a
`ratio of the radius of curvature of the object side face of the second
`lens to the focal length of the entire system.
`
`
`
`
`
`AOET, Ex. 1006
`Page 8
`
`

`

`5
`If the radius of curvature decreases as the value of the conditional
`expression (1) drops further below the lower limit, particularly in a
`bright lens of F3 or less, the light beam height increases as compared
`to a dark lens, and the light beam enters the lens periphery section
`having a larger lens face angle, so eccentricity error sensitivity
`increases. In addition, if the radius of curvature increases as the
`value of the conditional expression (1) further exceeds the upper
`limit, the incident angle of the light beam to the surface increases,
`and it becomes difficult to suppress the occurrence of aberration,
`such as coma aberration. Accordingly, by satisfying Conditional
`Expression (1), it is possible to obtain a lens with good aberration
`correction while reducing eccentricity error sensitivity.
`[0015]
`The imaging lens set forth in claim 2 of the present invention is
`characterized by satisfying the following conditional expression, for the
`invention set forth in claim 1.
`-1.0 < (r5 + r6)/(r5 - r6) < 2.5 ... (3)
`where
`r5: radius of curvature (mm) of the object-side face of the third lens
`56: radius of curvature (mm) of the image-side face of the third lens
`[0016]
`Conditional expression (3) is a conditional expression for defining
`the shape of the third lens. With the value of the conditional
`expression (3) exceeding the lower limit, the lens can be brought
`closer to the object side with respect to the position of the
`principal point of the third lens, which is a negative lens, so it
`becomes easy to ensure back focus. In addition, with the value of the
`conditional expression (3) falling below the upper limit, the third
`lens does not have a strong meniscus shape with a convex surface
`facing toward the object side, so it is possible to prevent the back
`focus from becoming too long and the overall optical length from
`becoming large.
`[0017]
`The imaging lens set forth in claim 3 of the present invention is
`characterized by satisfying the following conditional expression, for
`the invention set forth in claim 1 or claim 2.
`0.9 < f1/f < 1.2 ... (4)
`[0018]
`Conditional expression (4) is a conditional expression that defines
`the ratio of the power of the first lens to the power of the entire
`system. With the value of the conditional expression (4) exceeding the
`lower limit, it is possible to prevent an increase in eccentricity
`error sensitivity and the occurrence of high-order aberrations due to
`the power of the first lens being too strong. In addition, with the
`
`
`
`AOET, Ex. 1006
`Page 9
`
`

`

`6
`
`
`value of the conditional expression (4) falling below the upper limit,
`the positive power of the first lens close to the object side becomes
`stronger, and the principal point position of the entire system moves
`toward the object side, so the overall length of the optical system
`can be shortened.
`[0019]
`The imaging lens set forth in claim 4 of the present invention is
`characterized by satisfying the following conditional expression, for
`the invention set forth in any of claims 1-3.
`0.7 < Ds/Y < 1.2 ... (5)
`where
`Ds: distance (mm) from the aperture stop to the image plane
`Y: maximum image height (mm).
`[0020]
`Conditional expression (5) is a conditional expression for defining
`the ratio of the distance from the aperture stop to the image plane
`and the maximum image height. With the value of conditional expression
`(5) exceeding the lower limit, telecentricity can be improved by
`moving the aperture stop further from the image plane and moving the
`exit pupil position toward the object side, with respect to the
`maximum image height. In addition, with the value of conditional
`expression (5) falling below the upper limit, it is possible to
`prevent an increase in the overall optical length by preventing the
`aperture stop from being too far away from the image plane.
`[0021]
`The imaging lens set forth in claim 5 of the present invention is
`characterized by satisfying the following conditional expression, for
`the invention set forth in any of claims 1-4.
`0.15 < d1/TTL < 0.3 ... (6)
`where
`d1: core thickness (mm) of the first lens
`TTL: total length (mm) of the imaging lens (air conversion is
`used for the flat plate).
`[0022]
`Conditional expression (6) is a conditional expression for defining
`the ratio of the overall optical length to the axial thickness of the
`first lens.
`With the value of the conditional expression (6) exceeding the lower
`limit, the thickness of the first lens can be sufficiently ensured,
`which is advantageous for moldability. In addition, with the value of
`conditional expression (6) falling below the upper limit, it is
`possible to prevent the first lens from becoming too thick and thus
`making it difficult to reduce the overall optical length.
`[0023]
`
`AOET, Ex. 1006
`Page 10
`
`

`

`The imaging lens set forth in claim 6 of the present invention is
`characterized by satisfying the following conditional expression, for
`the invention set forth in any of claims 1-5.
`-2.0 < (r1 + r2)/(r1 - r2) < -0.6 ...(7)
`
`
`
`
`
`
`AOET, Ex. 1006
`Page 11
`
`

`

`7
`
`where
`r1: radius of curvature (mm) of the first lens object-side face
`r2: radius of curvature (mm) of the first lens image-side face
`[0024]
`Conditional expression (7) is a conditional expression for defining
`the shape of the first lens. With the value of the conditional
`expression (7) exceeding the lower limit, it is possible to suppress
`the occurrence of coma aberration or the like caused by too small of a
`radius of curvature of the object side face and the image side face of
`the first lens. In addition, with the value of the conditional
`expression (7) falling below the upper limit, the principal point
`position of the first lens moves toward the object side, so the
`overall optical length can be shortened.
`[0025]
`The imaging lens set forth in claim 7 of the present invention is
`characterized by satisfying the following conditional expression, for
`the invention set forth in any of claims 1-6.
`-2.0 < r3/f < -0.4 ... (8)
`[0026]
`Conditional expression (8) is a more desirable range for the ratio of
`the object-side curvature radius of the second lens and the focal
`length of the entire system. Satisfying this conditional expression
`makes it possible to better balance eccentricity error sensitivity and
`aberration correction.
`[0027]
`The imaging lens set forth in claim 8 of the present invention is
`characterized by satisfying the following conditional expression, for
`the invention set forth in any of claims 1-7.
`0.7 < f1/f2 < 2.3 ... (9)
`[0028]
`Conditional expression (9) is a more desirable range for the ratio of
`the focal lengths of the first lens and the second lens. By satisfying
`this conditional expression, the power ratio of the first lens and the
`second lens becomes more appropriate, and eccentricity error
`sensitivity can be reduced.
`[0029]
`The imaging lens set forth in claim 9 of the present invention is
`characterized by satisfying the following conditional expression, for
`the invention set forth in any of claims 1-8.
`0.1 < (r5 + r6)/(r5 - r6) < 2.0 ...(10)
`[0030]
`Conditional expression (10) is a more desirable range for the third
`lens shape. By satisfying this conditional expression, the overall
`optical length can be reduced while more appropriately maintaining
`back focus.
`
`AOET, Ex. 1006
`Page 12
`
`

`

`[0031]
`The imaging lens set forth in claim 10 of the present invention is
`characterized by satisfying the following conditional expression, for
`the invention set forth in any of claims 1-9.
`
`
`
`AOET, Ex. 1006
`Page 13
`
`

`

`8
`
`45 < v3 < 70 ... (11)
`v3: Abbe number of the third lens
`[0032]
`Conditional expression (11) is a conditional expression for defining
`the Abbe number of the third lens. With the value of the conditional
`expression (11) exceeding the lower limit, it is possible to suppress
`the occurrence of chromatic aberration of magnification caused by the
`peripheral section of the third lens. Further, the value of the
`conditional expression (11) being below the upper limit is
`advantageous for correcting axial chromatic aberration.
`[0033]
`The imaging lens set forth in claim 11 of the present invention is
`characterized by satisfying the following conditional expression, for
`the invention set forth in any of claims 1-10.
`TTL/f < 1.5 ... (12)
`[0034]
`Conditional expression (12) is a conditional expression for defining
`the ratio of the overall optical length to the focal length. By
`satisfying this conditional expression, it is possible to have an
`imaging lens with a good balance between the field angle and the
`overall optical length, and with a small overall optical length,.
`[0035]
`The imaging lens set forth in claim 12 of the present invention is
`characterized by satisfying the following conditional expression, for
`the invention set forth in any of claims 1-11.
`D/TTL > 1.5 ... (13)
`where
`D: entrance pupil diameter (mm).
`[0036]
`Conditional expression (13) is a conditional expression for defining
`the ratio of the entrance pupil diameter to the overall optical
`length. Due to the value of the conditional expression (13) exceeding
`the lower limit, a proper amount of light can be ensured, and the
`overall length can be shortened while maintaining a clear image with
`little noise. Meanwhile, due to the value of conditional expression
`(13) falling below the upper limit, it is not necessary to excessively
`increase the diameter of the entrance pupil, and correcting
`aberrations becomes easy.
`[0037]
`The imaging lens set forth in claim 13 of the present invention is
`characterized by the imaging lens having substantially no power, for the
`invention set forth in any of claims 1-12. In other words, it is within
`the scope of the present invention even when a dummy lens having
`substantially no power is applied to the configuration of claim 1.
`[0038]
`
`AOET, Ex. 1006
`Page 14
`
`

`

`The imaging device set forth in claim 14 of the present invention is
`characterized by including the imaging lens set forth in any of claims 1-
`13.
`
`
`
`
`AOET, Ex. 1006
`Page 15
`
`

`

`9
`
`[0039]
`The portable terminal set forth in claim 15 of the present invention is
`characterized by including the imaging device set forth in claim 14.
`Effect of the Invention
`[0040]
`Due to the present invention, it is possible to provide: an imaging
`lens with a three-lens configuration that, for a wide-angle bright lens
`which has a field angle of 65° or greater and an F-number of three or
`less, corrects various aberrations while having lower error sensitivity,
`better moldability, etc., than conventional types; and an imaging device
`and a portable terminal using the lens.
`Brief Description of the Drawings
`[0041]
`[Fig. 1] is a perspective view of an imaging device LU according to
`the present embodiment.
`[Fig. 2] is a cross-sectional view looking in the direction of the
`arrow when the configuration of FIG. 1 is cut at the arrow II-II line.
`[Fig. 3] is a figure showing a portable phone T.
`[Fig. 4] is a cross-sectional view of an imaging lens according to
`Embodiment 1.
`[Fig. 5] is an aberration diagram of spherical aberration (a),
`astigmatism (b), distortion aberration (c), and meridional coma
`aberration (d) of the imaging lens according to Embodiment 1.
`[Fig. 6] is a cross-sectional view of an imaging lens according to
`Embodiment 2.
`[Fig. 7] is an aberration diagram of spherical aberration (a),
`astigmatism (b), distortion aberration (c), and meridional coma
`aberration (d) of an imaging lens according to Embodiment 2.
`[Fig. 8] is a cross-sectional view of an imaging lens according to
`Embodiment 3.
`[Fig. 9] is an aberration diagram of spherical aberration (a),
`astigmatism (b), distortion aberration (c), and meridional coma
`aberration (d) of an imaging lens according to Embodiment 3.
`[Fig. 10] is a cross-sectional view of an imaging lens according to
`Embodiment 4.
`[Fig. 11] is an aberration diagram of spherical aberration (a),
`astigmatism (b), distortion aberration (c), and meridional coma
`aberration (d) of an imaging lens according to Embodiment 4.
`[Fig. 12] is a cross-sectional view of an imaging lens according to
`Embodiment 5.
`[Fig. 13] is an aberration diagram of spherical aberration (a),
`astigmatism (b), distortion aberration (c), and meridional coma
`aberration (d) of an imaging lens according to Embodiment 5.
`[Fig. 14] is a cross-sectional view of an imaging lens according to
`Embodiment 6.
`
`
`AOET, Ex. 1006
`Page 16
`
`

`

`10
`
`[Fig. 15] is an aberration diagram of spherical aberration (a),
`astigmatism (b), distortion aberration (c), and meridional coma
`aberration (d) of an imaging lens according to Embodiment 6.
`[Fig. 16] is a cross-sectional view of an imaging lens according to
`Embodiment 7.
`[Fig. 17] is an aberration diagram of spherical aberration (a),
`astigmatism (b), distortion aberration (c), and meridional coma
`aberration (d) of an imaging lens according to Embodiment 7.
`[Fig. 18] is a cross-sectional view of an imaging lens according to
`Embodiment 8.
`[Fig. 19] is an aberration diagram of spherical aberration (a),
`astigmatism (b), distortion aberration (c), and meridional coma
`aberration (d) of an imaging lens according to Embodiment 8.
`[Fig. 20] is a cross-sectional view of an imaging lens according to
`Embodiment 9.
`[Fig. 21] is an aberration diagram of spherical aberration (a),
`astigmatism (b), distortion aberration (c), and meridional coma
`aberration (d) of an imaging lens according to Embodiment 9.
`[Mode for carrying out the invention]
`[0042]
`Hereinafter, an embodiment of the invention is explained based on the
`drawings. FIG. 1 is a perspective view of an imaging device LU
`according to the present embodiment. FIG. 2 is a cross-sectional view
`looking in the direction of the arrow when the configuration of FIG. 1
`is cut at the arrow II-II line. As shown in FIG. 2, the imaging device
`LU comprises a CMOS-type image sensor IM as a solid-state imaging
`element having a photoelectric conversion unit Ima, an imaging lens LN
`for capturing a subject image to the photoelectric conversion unit
`(light-receiving surface) IMa of the image sensor IM, and an external
`connection terminal (electrode) (not shown) for transmitting and
`receiving the electric signal thereof, wherein the foregoing are
`integrally formed.
`[0043]
`An imaging lens LN having a maximum image height field angle of 65° or
`greater and an F-number of three or less comprises, in order from the
`object side (the top in FIG. 2), a first lens L1, an aperture stop S, a
`second lens L2, and a third lens L3, wherein: the first lens L1 is a
`positive lens with a convex object-side face; the second lens L2 is a
`positive meniscus lens with a concave object-side face; the third lens L3
`is a negative lens with an image-side face which is concave near the
`optical axis, has an inflection point within an effective radius, and is
`an aspheric face which becomes a convex face at the periphery of the lens.
`The lens may be made of glass or plastic.
`[0044]
`
`AOET, Ex. 1006
`Page 17
`
`

`

`A spacer SP1 is disposed between the first lens L1 and the second lens
`L2. A spacer SP1 is disposed between the second lens L2 and the third
`lens L3. A spacer SP3 is disposed between the third lens L3 and an IR
`cut filter F.
`
`
`
`
`AOET, Ex. 1006
`Page 18
`
`

`

`11
`Note that the flanges of the lenses L1 - L3 may be in contact with
`each other. The imaging lens LN satisfies the following equation:
`5.0 < r3/f < -0.4 ... (1)
`0.0 < f1/f2 < 5.0 ... (2)
`where
`r3: radius of curvature (mm) of the second lens L2 object-side
`face,
`f: focal length (mm) of the entire system,
`f1: focal length (mm) of the first lens L1,
`f2: focal length (mm) of the second lens L2.
`[0045]
`The imaging lens LN is fixed to the inner periphery of a housing BX.
`The lower edge of the housing BX is in contact with a substrate ST
`holding the image sensor IM.
`[0046]
`For the image sensor IM, a photoelectric conversion unit imA serving
`as a light-receiving unit with pixels (photoelectric conversion
`elements) arranged two-dimensionally is formed in the center of a
`plane on the light-receiving side of the image sensor, and is
`connected to a signal processing circuit (not shown). Said signal
`processing circuit comprises a driving circuit section which
`sequentially drives each pixel to obtain a signal charge, an A/D
`conversion section which converts each signal electric charge into a
`digital signal, and a signal processing section which forms an image
`signal output using the digital signal. In addition, a lot of pads
`(not shown) are arranged near the outer edge of the plane on the
`light-receiving side of the image sensor IM, and are connected to the
`image sensor IM via a wire (not shown). The image sensor IM converts a
`signal charge from the photoelectric conversion unit IMa into an image
`signal, such as a digital YUV signal, and outputs same to a prescribed
`circuit via the wire (not shown). Here, Y is a luminance signal, U (=
`R - Y) is a color difference signal between blue and the luminance
`signal, and V (= B - Y) is a color difference signal between blue and
`the luminance signal. Note that the solid-state imaging element is not
`limited to a CMOS-type image sensor, and may be a CCD or the like.
`[0047]
`The image sensor IM is connected via an external connection terminal
`to an external circuit (for example, a control circuit included in an
`upper-level device of the portable terminal on which the imaging
`device is mounted), and is capable of receiving, from an external
`circuit, a voltage or a clock signal for driving the image sensor IM,
`and outputting a digital YUV signal to an external circuit.
`
`
`
`AOET, Ex. 1006
`Page 19
`
`

`

`12
`
`[0048]
`Next, on the basis of an external view in FIG. 3, a portable phone
`will be described as an example of a portable terminal provided with
`an imaging device. Note that FIG. 3(a) is a view, as seen from the
`inside, of the folded portable phone whi