FOREIGN LANGUAGE INSTITUTE, INC.
` 428 Winding Lane Chalfont, PA 18914
`phone: 215-888-4227 e-Fax: 253-390-4866
`www.foreignlanguageinstitute.com
`director@foreignlanguageinstitute.com
`Stan Lichtman, M.A., M.B.A.
`Linguist / Director
`
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`Date: June 19, 2020
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`Document description: 688266.0071
`
`This attached set of pages comprises a VERIFIED translation of the original
`JAPANESE language document. It has been independently translated according
`to translation industry practice. It is a true and accurate translation performed
`to the best of our ability.
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`Stan Lichtman
`_______________________
`Stan Lichtman, Director
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`1/31
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`

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`(19) Japanese Patent Office (JP)
`
`(12) Unexamined Patent Gazette
`(A)
`
`(11) Unexamined Patent Application
`No:
`Kokai Hei 10-115778
`(43) Date of Publication: May 6, 1998
`
`
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`D
`
`(51) Int. Cl.6
` G 02 B 13/04
`
`
`13/18
`
`Class. Symbols
`
`
`July 28, 1997
`
`Hei 8-222394
`August 23, 1996
`Japan (JP)
`
`FI
` G 02 B 13/04
` 13/18
`Request for Examination: Not yet submitted Number of Claims: 9 OL (Total of 11 pages [in original])
`(21) Application No.:
`Hei 9-201903
`(71) Applicants: 000116998
`
`
`
`Asahi Seimitsu Kabushiki Kaisha
`(22) Date of Filing:
`
`
`2-5-2 Higashi Oizume,
`
`
`
`Nerima-ku, Tokyo-to
`(31) Priority No.:
`(72)
`Inventors:
`Eijiroh Tada
`(32) Priority Date:
`
`
`c/o Asahi Seimitsu Kabushiki
`(33) Priority Country:
`
`
`Kaisha
`
`
`
`2-5-2 Higashi Oizume,
`
`
`
`Nerima-ku, Tokyo-to
`
`(74) Agents:
`Kunio Miura, patent attorney
`
`
`
`
`
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`
`
`(54) [Title of the Invention] Super Wide-Angle Lens System Using Aspherical Lens
`
`(57) [Summary]
`
` [Object] To obtain a retrofocus type of super wide-angle lens system comprising front-group
`lenses [sic, and hereinafter] having a negative power and rear-group lenses [sic, and hereinafter]
`having a positive power, in order from the object side, wherein a fast lens system has an angle of
`view of approximately 120˚ to 140˚ and an F-number of approximately 1.2 to 1.4, without the
`radius of curvature of the second surface of a negative-meniscus first lens being reduced.
`
` [Solution] The front-group lenses have a negative-meniscus first lens having a convex surface
`facing the object side, and a second lens having at least one aspherical surface. The second lens
`having an aspherical surface is shaped such that it is biconcave in the vicinity of the center of the
`optical axis and becomes a negative-meniscus lens that is convex on the object side at the edges.
`
`
`2/31
`
`

`

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`
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`
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`
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`
`
`
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`
`
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`
`(1)
`(1)
`
`3/31
`
`3/31
`
`

`

` [Claims]
`
` [Claim 1] A retrofocus type of super wide-angle lens system comprising front group lenses
`having a negative power and rear group lenses having a positive power, in order from the object
`side;
` said super wide-angle lens system using an aspherical lens, characterized by the above-
`mentioned front-group lenses having a negative-meniscus first lens with a convex surface facing
`the object side and a second lens having at least one aspherical surface, in order from the object
`side, and
` the above-mentioned aspherical second lens is shaped such that it is a biconcave lens in the
`vicinity of the center of the optical axis and becomes a negative-meniscus lens that is convex on
`the object side at the edges.
`
` [Claim 2] The lens system of claim 1, said super wide-angle lens system, wherein rear group
`lenses include at least a single lens and a diaphragm, in order from the the object side.
`
` [Claim 3] The lens system of claim 2; said super wide-angle lens system, wherein the rear-
`group lenses provided with two pairs of combined lenses, each pair having a positive lens and a
`negative lens thus combined, behind the diaphragm.
`
` [Claim 4] The lens system of any one of claims 1 to 3; said super wide-angle lens system,
`wherein the aspherical second lens has aspherical surfaces on both sides.
`
` [Claim 5] The lens system of any one of claims 1 to 4; said super wide-angle lens system,
`wherein boundary portions of the aspherical second lens, between the biconcave lens part in the
`vicinity of the center of the optical axis and the edge negative-meniscus lens parts, are located
`substantially on outer peripheral parts of an axial bundle of light defined by an F-number.
`
` [Claim 6] The lens system of any one of claims 1 to 5; said super wide-angle lens system,
`wherein a surface of the second lens on the object side comprises an aspherical surface and
`satisfies the following Conditions (1) through (4):
`
`
`
`
`
`wherein
`
`R3 denotes the radius of curvature of a paraxial spherical surface of the aspherical surface of the
`second lens on the object side;
`A4 denotes a fourth-order aspherical factor of the aspherical surface of the second lens on the
`object side;
`A6 denotes a sixth-order aspherical factor of the aspherical surface of the second lens on the
`object side; and
`A8 denotes an eighth-order aspherical factor of the aspherical surface of the second lens on the
`
`4/31
`
`

`

`object side.
`
` [Claim 7] The lens system of any one of claims 1 to 6; said super wide-angle lens system,
`wherein the rear-group lenses comprises two pairs of combined lenses, each pair having a
`positive lens and a negative lens thus combined, behind the diaphragm, in order from the object
`side.
`
` [Claim 8] Claim 7 [sic]; said super wide-angle lens system, wherein the front-group lenses
`comprises a negative-meniscus first lens in which the convex surface faces the object side, and a
`second lens having at least one aspherical surface, and the rear-group lenses comprise a positive
`single third lens, a diaphragm, a combined lens having a negative fourth lens and a positive fifth
`lens, and a combined lens having a negative sixth lens and a positive seventh lens, and further,
`satisfies the following conditions (5) through (8):
`
`
`
`
`wherein
`
`R8 denotes a radius of curvature of the surface of the fourth lens on the image side;
`R11 denotes a radius of curvature of the surface of the sixth lens on the image side;
`f7-9 denotes a combined focal length of the fourth and fifth lenses;
`f10-12 denotes a combined focal length of the sixth and seventh lenses; and
`f denotes a focal length of the entire system.
`
` [Claim 9] The lens system of claim 8; said super wide-angle lens system, wherein the third lens
`comprises a positive-meniscus lens that is convex on the image side; the fourth lens comprises a
`negative lens that is concave on the image side; the fifth lens comprises a biconvex positive lens;
`the sixth lens comprises a negative-meniscus lens that is convex on the object side; and the
`seventh lens comprises a biconvex positive lens.
`
` [Detailed Description of the Invention]
`
` [0001]
`
` [Technical Field] The present invention pertains to a super wide-angle lens system that can be
`used for a surveillance camera (CCTV), etc.
`
` [0002]
`
` [Prior Art and Problems Thereof] In general, a super wide-angle lens system is used for a lens
`used in a surveillance camera or the like to be able to view or monitor a wider range. A
`retrofocus type having negative front-group lenses and positive rear-group lenses and is
`advantageous to increase the angle width and increase the back focal distance is used widely for
`a super wide-angle lens system. With this retrofocus type, the angle of view can be widened by
`increasing the negative power of the front-group lenses. Thus, the negative power could be
`
`5/31
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`

`

`shared among a plurality of negative lenses of the front-group lenses. These negative lenses of
`the front-group lenses generally have a negative-meniscus first lens having a convex surface
`facing the object side, and a negative second lens. The reason that the meniscus lens is used as a
`lens having negative power is because it has a shape that is advantageous for reducing the
`occurrence of astigmatism and distortion of bundle of light primarily at a large angle of view.
`
` [0003] When the front-group lenses had a negative-meniscus first lens and the negative second
`lens as such, with a super wide-angle lens that achieves an angle of view of 120˚ to 140˚, there
`were problems because the radius of curvature of the concave surface of the second surface of
`the negative-meniscus first lens decreased (the depth of the concave surface increased), making it
`extremely difficult to manufacture the meniscus lens. If the negative power of the second lens is
`increased, the load of the negative power of the first lens decreases, so
`(2)
`
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`6/31
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`

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`the radius of curvature of the second surface of the first lens increases. However, when the
`negative power was increased by making the second lens biconcave, for example, a problem
`occurred because an under-curvature of field occurred. Thus, a design to balance the negative
`power between the first lens and the second lens had to be seriously considered.
`
` [0004]
`
` [Purpose of the Invention] The purpose of the present invention is to obtain a lens system of a
`retrofocus type of super wide-angle lens system comprising front-group lenses having a negative
`power and rear-group lenses having a positive power, in order from the object side, wherein a
`fast lens system has an angle of view of approximately 120˚ to 140˚ and an F-number of
`approximately 1.2 to 1.4, without the radius of curvature of the second surface of a negative-
`meniscus first lens being reduced.
`
` [0005]
`
` [Summary of the Invention] The present invention is a retrofocus type of super wide-angle lens
`system comprising front group lenses having a negative power and rear group lenses having a
`positive power, in order from the object side, wherein the front-group lenses have a negative-
`meniscus first lens with a convex surface facing the object side and a second lens having at least
`one aspherical surface, in order from the object side, and this aspherical second lens is shaped
`such that it is a biconcave lens in the vicinity of the center of the optical axis (for a bundle of
`light at a small angle of view) and becomes a negative-meniscus lens that is convex on the object
`side at the edges(for a bundle of light at a large angle of view).
`
` [0006] It is preferable to make a surface of the second lens having an aspherical surface an
`aspherical surface on the object side thereof and to satisfy Conditions (1) through (4).
`
`
`
`
`
`where
`
`R3 denotes the radius of curvature of a paraxial spherical surface of the aspherical surface of the
`second lens on the object side;
`A4 denotes a fourth-order aspherical factor of the aspherical surface of the second lens on the
`object side;
`A6 denotes a sixth-order aspherical factor of the aspherical surface of the second lens on the
`object side; and
`A8 denotes an eighth-order aspherical factor of the aspherical surface of the second lens on the
`object side.
`
` [0007] This aspherical second lens can be composed entirely of a plastic molded lens, or it can
`be composed of a hybrid lens having an aspherical plastic layer adhered to a spherical glass lens.
`
`7/31
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`

`

`
` [0008] Rear-group lenses having positive power can be selected from many combinations of
`lenses. For example, it is advantageous if it is composed of a positive single lens, a diaphragm,
`and two pairs of composite lenses, with each pair having a combined positive lens and a negative
`lens, in order from the object side, because the divergent bundle of light from the front group is
`readily received, while an axial chromatic aberration and a chromatic aberration of magnification
`are readily corrected by a simple configuration.
`
` [0009] More specifically, it is preferable that the front-group lenses comprises a negative-
`meniscus first lens in which the convex surface faces the object side, and a second lens having at
`least one aspherical surface, and the rear-group lenses comprise a positive single third lens, a
`diaphragm, a combined lens having a negative fourth lens and a positive fifth lens, and a
`combined lens having a negative sixth lens and a positive seventh lens, and further, satisfies the
`following conditions (5) through (8):
`
`
`
`
`wherein
`
`R8 denotes a radius of curvature of the surface of the fourth lens on the image side;
`R11 denotes a radius of curvature of the surface of the sixth lens on the image side;
`f7-9 denotes a combined focal length of the fourth and fifth lenses;
`f10-12 denotes a combined focal length of the sixth and seventh lenses; and
`f denotes a focal length of the entire system. Further specifically, it is preferable that the third
`lens comprises a positive-meniscus lens that is convex on the image side; the fourth lens
`comprises a negative lens that is concave on the image side; the fifth lens comprises a biconvex
`positive lens; the sixth lens comprises a negative-meniscus lens that is convex on the object side;
`and the seventh lens comprises a biconvex positive lens.
`
` [0010]
`
` [Embodiments of the Invention] The negative first lens group of the retrofocus type of the
`super wide-angle lens system of the present invention has a negative-meniscus first lens having a
`convex surface facing the object side and a second lens having at least one aspherical surface, in
`order from the object side. The shape of this second lens having an aspherical surface is such that
`it is a biconcave lens in the vicinity of the center of the optical axis (for a bundle of light at a
`small angle of view) and becomes a negative-meniscus lens that is convex on the object side at
`the edges (for a bundle of light at a large angle of view).
`
` [0011] The aspherical second lens is shaped so as to form a negative-meniscus lens that is
`convex on the object side at the edges, in order to solve the problem of under-curvature of the
`image surface when negative power is provided on the basis of the biconcave lens, and on the
`other hand, the negative power of the biconcave lens is simply increased, in order to alleviate the
`load of the negative power of the negative-meniscus first lens. Assuming both sides of this
`aspherical second lens are aspherical surfaces, correction of aberration is facilitated.
`
`8/31
`
`

`

`
` [0012] In addition, the boundary parts of the aspherical second lens, between the biconcave
`lens part in the vicinity of the center of the optical axis and the peripheral negative-meniscus lens
`parts, is preferably situated at substantially the outer peripheral part of the axial bundle of light
`determined by the F-number. If the size of the central biconcave lens part is smaller than the
`outer peripheral part of the axial bundle of light, the axial astigmatism and chromatic aberration
`are affected, and at the same time, the aspherical aberration factor at the low-order term becomes
`large. The change in the sag amount of the aspherical surface shown in Figure 21 becomes too
`large and it is difficult to obtain the surface shape that is most suitable for correcting the off-axis
`aberrations. In addition, if the size of the central biconcave part is larger than the outer peripheral
`part of the axial bundle of light, the area of the negative-meniscus lens is narrowed, and it is
`difficult to obtain a satisfactory aberration correction.
`
`
`(3)
`
`
`
`9/31
`
`

`

`
` [0013] Conditions (1) through (4) are conditions for the aspherical surface (third surface) of the
`second lens on the object side. Condition (1) is the radius of curvature of the paraxial spherical
`surface of the third surface of the second lens and the focal length of the entire optical system. If
`this is below a lower limit, the radius of curvature is large and the back focus is insufficient with
`respect to the focal length. If it exceeds an upper limit, the radius of curvature is too small, and
`correction of the off-axis aberrations become difficult by the aspherical amount.
`
` [0014] Condition (2) is a condition for the fourth-order aspherical factor of this aspherical
`surface. If it is below the lower limit, correction of astigmatism is inadequate. If it exceeds the
`upper limit, the sag amount from the spherical (third) surface with respect to the F-number (axial
`bundle of light) of this optical system become too large, which would affect the spherical
`aberration, and the performance at the center is reduced.
`
` [0015] Conditions (3) and (4) are conditions for a sixth-order aspherical factor and an eighth-
`order aspherical factor, respectively. If outside their scopes, the astigmatism increases going
`toward the peripheral portion when the angle of view is large.
`
` [0016] Conditions (5) through (8) are conditions pertaining to the second lens group.
`Conditions (5) and (6) are conditions for the respective radii of curvature of the radius of
`curvature of the surface (eighth surface) of the fourth lens on the image side, the radius of
`curvature of the surface (eleventh surface) of the sixth lens on the image side, and the focal
`length of the entire optical system. In addition, Conditions (7) and (8) specify the ratio of the
`composite focal length of the fourth lens and fifth lens and the focal length of the entire system,
`and the ratio of the composite focal length of the sixth lens and seventh lens and the entire
`system, respectively.
`
` [0017] If both Conditions (7) and (8) exceed the upper limit, the focal length of the entire
`optical system is increased, and the angle of view decreases with the same image surface size.
`Conversely, if Conditions (7) and (8) are below the lower limit, the back focus is insufficient
`with respect to the focal distance.
`
` [0018] If Conditions (7) and (8) are satisfied, but outside the scope of Condition (5), the
`spherical aberration and the axial chromatic aberration are augmented, and the performance at
`the center of the image surface is adversely affected. If an attempt is made to correct in other
`ways, correction of off-axis aberrations would become difficult.
`
` [0019] Furthermore, if Condition (6) is below the lower limit, over-correction of the chromatic
`aberration of magnification occurs and the off-axis performance is deteriorates. If the upper limit
`of Condition (6) is exceeded, correction of the spherical aberration is difficult in the scope of
`Condition (5).
`
` [0020] Specific working examples are described next.
`
` [Working Example 1] Figure 1 shows a configuration of Working Example 1 of the super
`wide-angle lens system of the present invention. This lens system comprises front-group lenses
`
`10/31
`
`

`

`10 and rear-group lenses 20 in order from the object side. The front-group lenses 10 comprise, in
`order from the object side, a negative-meniscus first lens 11 that is convex on the object side, and
`a secondlens 12 that is aspherical on each side, is a biconcavelensin the vicinity of the center,
`and becomesa negative-meniscus lens that is convex on the object side at the edges. The rear-
`group lenses 20 comprise a positive-meniscus third lens 21 having a convex surface facing the
`imageside, a cementedlens consisting of a biconcave fourth lens 22 and a biconvexfifth lens
`23, and a cementedlens consisting of a negative-meniscus lens 24 that is convex on the object
`side and a biconvex lens 25. A diaphragmSis positioned between the third lens 21 and the
`fourth lens 22 of the rear-group lenses 20. C is a glass cover of a CCD.
`
`[0021] Table 1 showsspecific numerical data of a working example of the super wide-angle
`lens system in Figure 1. Surface Nos. 13 and 14 are glass covers C, and surface No. 15 is a
`position on an image pickup surface of the CCD. Figures 2 through 5 are diagrams of aberrations
`in Figure 1. In the diagrams of the aberrations, the d-line, g-line, and C-line denote chromatic
`aberrations specified by spherical aberrations at respective wavelengths; while S denotes Sagittal
`and M denotes Meriodonal.
`
`[0022] A rotation-symmetrical aspherical surface is defined by the following expression:
`
`xh? /(1+(1-(1+K) C2h?)!/ 2) +A4h* +Abh® +A8he+
`
`(C denotes a curvature (I/r); h denotes a height from the optical axis; and K denotes a cone
`coefficient [sic: conic constant]).
`
`[0023] In the tables and drawings, Fno denotes an F-number; f denotes a focal length; W
`denotes a half angle of view; and fp denotes a back focus. R denotes a radius of curvature; D
`denotes a lens spacing; Na denotesa refractive index of the d-line; and va denotes the Abbe’s
`numberofthe d-line.
`
`[0024]
`
`[Table 1]
`
`Surface No.
`1
`2
`3%
`4
`5
`é
`
`diaphragm
`7
`
`R
`16.361
`2.N7
`-7.296
`3.887
`-15.840
`-3.450
`
`20
`-29.920
`
`Ny
`1.772%
`-
`1. 49176
`-
`1.84666
`-
`
`~
`1.84666
`
`¥¢
`49.6
`-
`57.4
`-
`23.5
`-
`
`-
`23.8
`
`D
`0.634
`1.940
`1.760
`2.204
`1. 436
`0.574
`
`1.338
`0.317
`
`(4)
`
`11/31
`
`11/31
`
`

`

`
`
` *
`
` is a rotation-symmetrical aspherical surface.
`
`
`Aspherical surface data:
`
`
`
`
`
` [0025] Of the aspherical surface No. 3 and surface No. 4, surface No. 3 is important for
`forming the second lens 12 that is a biconcave lens in the vicinity of the center and becomes a
`negative-meniscus lens having a convex on the object side at the edges. Therefore, the surface
`shapes, paraxial spherical amounts, and aspherical amounts of surface No. 3 are shown in Table
`2 next (unit: mm). Figure 21 is a diagram in which the aspherical amounts, etc., are defined.
`
` [0026]
`
`
`12/31
`
`

`

` [Table 2]
`
`Distance from
`optical axis
`
`
`
`
`Surface
`shape
`
`
`Paraxial spherical
`
`amount
`
`
`
`
`Aspherical
`amount
`
`
`
`
`
` [0027] The inflection [tn: misspelled in the original; the same hereinafter] points in the Sagittal
`direction are obtained by first-order differentials of the surface shapes in Table 2, and the
`inflection points in the Meriodonal direction are obtained by second-order differentials thereof.
`
` [0028] [Working Example 2] Figure 6 shows a configuration of a Working Example 2 of the
`super wide-angle lens system of the present invention. The basic configuration of this lens
`system is equivalent to that of Working Example 1, with the exception that the fourth lens 22 in
`the second lens group comprises a negative-meniscus lens that is convex on the object side.
`Table 3 includes specific numerical data of this working example and Table 4 includes data for
`the surface shapes, the paraxial spherical amounts, and aspherical amounts of surface No. 3.
`Figures 7 through 10 are diagrams of aberrations.
`
` [0029]
`
` [Table 3]
`
`
`
`
`
`
`(5)
`
`
`
`13/31
`
`

`

`W=58.4
`
`f,=2.75 (=0.432/1.51633+2. 467)
`
`R
`Surface No.
`13.592
`1
`3.238
`2
`-6.981
`3%
`3.485
`4 *
`-11.389
`5
`~4.026
`6
`diaphragm ©
`7
`17.988
`8
`2.97
`9
`-5.170
`
`10
`Bl
`12
`B
`14
`6
`
`4.050
`2.479
`-10.343
`90
`oo
`oo
`
`0.360
`1.619
`
`1.799
`3.231
`0.648
`0.980
`2.319
`0.324
`1.439
`0.036
`0.324
`1.691
`0.000
`0. 432
`2. 467
`
`Ng
`1.77200
`
`1.49176
`
`1.84666
`
`1.84666
`1.51633
`
`1.84666
`1.772500
`
`64.1
`
`23.8
`49.6
`
`1.51633
`
`64.1
`
`* is a rotation-symmetrical aspherical surface.
`
`Aspherical surface data:
`
`No.3; K=0.00 Ad= 0.3033010°! Ab=-). 43125 10"*
`AS=0. 46329 10°? A10=-0.24092 «10° #
`
`No.4; K=0.00 Ad= 0.50708% 10°! A6=-0.52255>% 10° *
`AS= 0.34087 *10°% Al0=-0.73846 10°*
`
`[0030]
`
`14/31
`
`14/31
`
`

`

` [Table 4]
`
`Distance from
`optical axis
`
`
`
`
`Surface
`shape
`
`
`Paraxial spherical
`amount
`
`
`Aspherical
`amount
`
`
`
`
`
`
`
`
`
`(6)
`
`15/31
`
`

`

`2. 30000
`2. 40000
`
`2.50000
`
`0.054639
`0.073154
`
`0. 089673
`
`—0. 389766
`-0. 425517
`
`-0. 462997
`
`0.444405
`0.498671
`
`0.552670
`
`[0031] [Working Example 3] Figure 11 showsa configuration of Working Example 3 of the
`super wide-angle lens system of the present invention. A specific configuration ofthis lens
`system is similar to that of Working Example 2. Table 5 includes specific numerical data of this
`working example, and Table 6 includes data for the surface shapes, paraxial spherical amounts,
`and aspherical amounts of surface No. 3. Figures 12 through 15 are diagrams ofaberrations
`thereof.
`
`[0032]
`
`[Table 5]
`
`Fyo=1:1.3
`f=1.00
`W=58.5
`
`fe=2.79 (=0. 4377/1. 5163342. 501)
`Surface No.
`R
`D
`Ny
`va
`1
`
`1.77250
`
`49.6
`
`11.660
`
`0. 364
`
`2
`3
`4 *
`5
`6
`
`diaphragm
`7
`8
`9
`10
`li
`12
`13
`14
`15
`
`3.274
`-8.060
`3.032
`-11.339
`-3.881
`
`=
`28.148
`3.022
`-4.790
`4.000
`2.425
`-11.318
`20
`90
`90
`
`1,637
`2.485
`3. 046
`0.655
`0.546
`
`2.417
`0.327
`1.455
`0.036
`0.327
`1.637
`0.000
`0.437
`2.501
`-
`
`-
`1.49176
`-
`1.84666
`-
`
`-
`1.84666
`1.51633
`-
`1.84666
`1.77250
`-
`1.51633
`-
`-
`
`-
`957.4
`-
`23.8
`-
`
`-
`23.8
`64.1
`-
`23.8
`49.6
`-
`64.1
`-
`-
`
`* is a rotation-symmetrical aspherical surface.
`
`Aspherical surface data:
`No.3; K=0.00 Ad= 0.20485107? Ab=-).25925%10"*
`AS8=0. 24634 X 10° Al0=-0.11117 <10°4
`No.4; K=0.00 Ad= 0.44252 10°) Ab=-0.58852>% 10°¢
`A8= 0.39420 *10°* Al0=-0.79700 «10>?
`
`[0033]
`
`16/31
`
`16/31
`
`

`

` [Table 6]
`
`Distance from
`optical axis
`
`
`
`
`Surface
`shape
`
`
` Paraxial spherical
` amount
`
`
` Aspherical
` amount
`
`
`
`
`
`
`
`(7)
`
`
`
`17/31
`
`

`

`1. 40000
`1.50000
`
`1.60000
`1.70000
`1.80000
`1.90000
`2.00000
`2.10000
`2. 20000
`2. 30000
`2. 40000
`2.50000
`2.60000
`
`2.70000
`
`—0. 060032
`—0. 060962
`
`—0. 060294
`—0. 057864
`—0. 053523
`-0. 047133
`—0. 038568
`—0. 027713
`—0. O14479
`0.001185
`0.019254
`0. 039585
`0. 061843
`
`0. 085399
`
`-0. 122519
`—0. 140808
`
`-0. 160405
`—0. 181320
`—0. 203563
`-O0. 227146
`—0. 252081
`—0. 278381
`-0. 306059
`~0. 335131
`-0. 365612
`—-0. 397520
`-0. 430872
`
`—0, 465686
`
`0.062488
`0.079846
`
`0.100111
`0.123456
`0.150040
`0.180013
`0.213513
`0.250668
`0.291580
`0.336316
`0. 384866
`O.437105
`0.492715
`
`0.551085
`
`[0034] [Working Example 4] Figure 16 showsa configuration of a Working Example 4 of the
`super wide-angle lens system of the present invention. The basic configuration of this lens
`system is similar to that of Working Example 2. Table 7 includes specific numerical data ofthis
`working example, and Table 8 includes data for the surface shapes, paraxial spherical amounts,
`and aspherical amounts of surface No. 3. Figures 17 through 20 are diagrams ofaberrations
`thereof.
`
`[0035]
`
`[Table 7]
`
`Fyo2l:1.3
`f=1.00
`W=58.1
`
`£,=2.90 (=0.422/1.51633+2. 622)
`
`v4
`Ng
`D
`R
`Surface No.
`
`
`1 1.7720=49.617.000 0. 500
`
`2
`2.016
`1.793
`-
`-
`3
`-10.108
`1.149
`1.49176
`57.4
`+
`6.008
`1.950
`-
`-
`a)
`-16.636
`1.300
`1.84666
`23.8
`6
`-3.553
`1.880
`-
`-
`
`23.8
`1.84666
`0. 300
`9.609
`7
`64.1
`1.51633
`2.000
`2.691
`8
`-
`-
`0.030
`-3. 867
`9
`23.8
`1.84666
`0.300
`4.862
`10
`
`
`
`11 1.7720=49.62.512 1. 300
`12
`-8.951
`0.000
`-
`-
`b
`00
`0. 422
`1.51633
`64.1
`14
`a0
`2.622
`-
`-
`15
`0
`-
`-
`-
`
`* is a rotation-symmetrical aspherical surface.
`
`18/31
`
`18/31
`
`

`

`Aspherical surface data:
`
`
`
` [0036]
`
` [Table 8]
`
`Distance from
`optical axis
`
`
`
`
`
`
`
`
`
`
`Surface
`shape
`
`
` Paraxial spherical
` amount
`
`
` Aspherical
` amount
`
`
`
`(8)
`
`
`
`
`
`19/31
`
`

`

`0. 40000
`0. 50000
`
`0. 60000
`0. 70000
`0. 80000
`0. 90000
`1.00000
`1.10000
`1. 20000
`1. 30000
`1. 40000
`1.50000
`1.60000
`
`1.70000
`1. 80000
`
`—0. 009418
`-0. 014283
`
`—0. 019826
`—0. 025827
`—0. 032049
`-O0. 038241
`—0. 044148
`—0. 049517
`-0. 054104
`-0. O5T680
`-0. 060032
`—0. 060962
`-0. 060294
`
`—0. 057864
`—0. 053525
`
`. 009932
`- 015524
`
`- 022364
`. 030455
`- 039801
`- 050406
`. 062275
`. 075415
`- 089831
`- 105530
`. 122519
`- 140808
`- 160405
`
`. 181320
`. 203563
`
`eoccoeocooocccooS
`
`-000514
`-001241
`
`- 002538
`- 004627
`-OOTT51
`-012164
`-O18127
`- 025898
`
`-O35726
`- 047849
`-062488
`-O79846
`- 100111
`
`- 123456
`- 150040
`
`[0037] The values with respect to the respective conditions of Working Examples 1 through 4
`are shown in Table 9.
`
`[Table 9]
`
`[0038]
`
`Working Example 1 Working Example 2
`-7. 296
`-6. 981
`Condition (1)
`4.150010"?
`3. 033010"?
`Condition(2)
`Condition (3)
`-7.216910™'
`-4. 3125«10"*
`Condition (4)
`1.0529x10"°
`4. 632910" *
`Condition (5)
`2.549
`2. 907
`Condition (6)
`Condition(7)
`2,400
`2. 479
`Condition (8)
`§29. 729
`25. 228
`4.18
`4,178
`
`Condition (1)
`Condition (2)
`Condition (3)
`Condition (4)
`Condition (5)
`Condition (6)
`_.
`Condition (7)
`
`Condition (8)
`
`Working Example 3 Working Example 4
`-8. 060
`-10. 108
`2.048510°?
`8. 881010"?
`-2. 5925x 10 ;
`-2, 7110 x1 2
`= 4
`-3
`2468410
`7, 969010
`3.022
`2. 691
`2.425
`2. 512
`27. 255
`25, 229
`4,229
`4. 543
`
`[Effects of the Invention] According to the super wide-angle lens system of the present
`invention, a super wide-angle lens system that is exceedingly wide at an angle of view of 120° to
`140° andfast at an F-numberof approximately 1.2 to 1.4, and moreover, image formation
`aberration characteristics are corrected satisfactorily is obtained.
`
`[Brief Description of the Drawings]
`
`20/31
`
`20/31
`
`

`

` [Figure 1] is a configuration diagram of Working Example 1 of the super wide-angle lens
`system according to the present invention.
`
` [Figure 2] is a diagram of chromatic aberrations represented by spherical aberrations, of the
`super wide-angle lens system in Figure 1.
`
` [Figure 3] is an astigmatism diagram of the super wide-angle lens system in Figure 1.
`
` [Figure 4] is a distortion diagram of the super wide-angle lens system in Figure 1.
`
` [Figure 5] is a diagram of coma aberrations of the super wide-angle lens system in Figure 1.
`
` [Figure 6] is a configuration diagram of Working Example 2 of the super wide-angle lens
`system according to the present invention.
`
` [Figure 7] is a diagram of chromatic aberrations represented by spherical aberrations of the
`super wide-angle lens system in Figure 6.
`
` [Figure 8] is an astigmatism diagram of the super wide-angle lens system in Figure 6.
`
` [Figure 9] is a distortion diagram of the super wide-angle lens system in Figure 6.
`
` [Figure 10] is a diagram of coma aberration of the super wide-angle lens system in Figure 6.
`
` [Figure 11] is a configuration diagram of Working Example 3 of the super wide-angle lens
`system according to the present invention.
`
` [Figure 12] is a diagram of chromatic aberrations represented by spherical aberrations of the
`super wide-angle lens system in Figure 11.
`
` [Figure 13] is an astigmatism diagram of the super wide-angle lens system in Figure 11.
`
` [Figure 14] is a distortion diagram of the super wide-angle lens system in Figure 11.
`
` [Figure 15] is a diagram of coma aberration of the super wide-angle lens system in Figure 11.
`
` [Figure 16] is a configuration diagram of Working Example 4 of the super wide-angle lens
`system according to the present invention.
`
` [Figure 17] is a diagram of chromatic aberrations represented by spherical aberrations of the
`super wide-angle lens system in Figure 16.
`
` [Figure 18] is an astigmatism diagram of the super wide-angle lens system in Figure 16.
`
` [Figure 19] is a distortion diagram of the super wide-angle lens system in Figure 16.
`
`
`21/31
`
`

`

` [Figure 20] is a diagram of coma aberration of the super wide-angle lens system in Figure 16.
`
` [Figure 21] is a diagram defining aspherical amounts, etc., of the lens.
`
`
`
`
`
`
`(9)
`
`22/31
`
`

`

`[Figure 1]
`
`
`
`[Figure 2]
`
`
`
`
`
`Spherical aberration
`Chromatic Aberration
`
`
`[Key] d: d-line; g: g-line; C: C-line
`
`[Figure 3]
`
`
`
`
`
`Astigmatism
`
`23/31
`
`

`

`[Figure 4]
`
`
`
`[Figure 7]
`
`
`
`Distortion
`
`
`Spherical aberration
`Chromatic Aberration
`
`
`[Key] d: d-line; g: g-line; C: C-line
`
`[Figure 5]
`
`
`
`[Key] d: d-line; g: g-line; C: C-line
`
`
`
`24/31
`
`

`

`
`[Figure 6]
`
`
`
`[Figure 8]
`
`
`
`[Figure 12]
`
`
`
`
`
`Astigmatism
`
`
`Spherical aberration
`Chromatic Aberration
`
`
`[Key] d: d-line; g: g-line; C: C-line
`
`25/31
`
`

`

`
`[Figure 9]
`
`
`
`[Figure 10]
`
`
`
`Distortion
`
`
`[Key] d: d-line; g: g-line; C: C-line
`
`[Figure 11]
`
`
`
`
`
`
`
`
`26/31
`
`

`

`[Figure 13]
`[Figure 13]
`
`
`
`
`
`
`
`
`
`Astigmatism
`Astigmatism
`
`(10)
`(10)
`
`
`
`27/31
`
`27/31
`
`

`

`[Figure 14]
`
`
`
`[Figure 15]
`
`
`
`
`Distortion
`
`
`[Key] d: d-line; g: g-line; C: C-line
`
`
`
`
`28/31
`
`

`

`[Figure 16]
`
`
`
`[Figure 17]
`
`
`
`
`
`Spherical aberration
`Chromatic Aberration
`
`
`[Key] d: d-line; g: g-line; C: C-line
`
`[Figure 18]
`
`
`
`
`Astigmatism
`
`
`
`29/31
`
`

`

`[Figure 19]
`
`
`
`[Figure 20]
`
`
`
`Distortion
`
`
`[Key] d: d-line; g: g-line; C: C-line
`
`[Figure 21]
`
`
`
`
`
`[Key]
`
` a: paraxial spherical surface; b: aspherical surface; c: sag amount; d: paraxial spherical amount;
`
`
`
`30/31
`
`

`

`e: aspherical amount; f: paraxial spherical surface; g: aspherical surface
`
`
`(11)
`
`31/31
`
`