` 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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`
`
`(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
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`(51) Int. Cl.6
` G 02 B 13/04
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`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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` “I. r. [I r :1 r r: rurnrnrurtsru
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`
`
`22
`23
`5
`
`21
`
`31.25
`
`CI‘II
`
`I I' raft!
`“I“ ll mm
`
`dl
`
`H?
`
`El
`
`‘4
`
`ii
`
`Cl! C? dtdldlldllfllzd'll
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`
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`
`(1)
`(1)
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`3/31
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`3/31
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`
`
` [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
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`
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`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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`
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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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`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
`
`
`
`
` [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)
`
`
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`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 second lens 12 that is aspherical on each side, is a biconcave lens in the vicinity of the center,
`and becomes a 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
`image side, a cemented lens consisting of a biconcave fourth lens 22 and a biconvex fiflh lens
`23, and a cemented lens consisting of a negative-meniscus lens 24 that is convex on the object
`side and a biconvex lens 25. A diaphragm S is 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 shows specific 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:
`
`x=Fh3/11+[l-(19K)f:11'~l" thMlfimthAsh'4
`
`(C denotes a curvature (l/r); h denotes a height from the optical axis; and K denotes a cone
`coefficient [sicz 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 f3 denotes a back focus. R denotes a radius of curvature; D
`denotes a lens spacing; Nd denotes a refractive index of the d-line; and va denotes the Abbe’s
`number of the d-line.
`
`[0024]
`
`[Table 1]
`
`Surface No.
`1
`3
`3
`4
`5
`‘I-
`
`diaphragm
`T
`
`R
`ll). 31)]
`2. 917
`4.290
`5‘. 1-187
`-15. 840
`-3. 150
`
`:x;
`{19. 920
`
`N
`1. 77350
`-
`1.4917!)
`’
`1. 3-1006
`-
`
`-
`1.8413116
`
`'w a
`4". 1;
`-
`57.4
`’
`23.3
`-
`
`-
`33. 3
`
`U
`0. 113-1
`1.910
`1.700
`2. 20-1
`1.1130
`0. 57-1
`
`1. 138
`0. 317
`
`(4)
`
`11/31
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`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
`
`
`
`U=58A
`
`fa 22.75 (20.432/1. 5163302. 467)
`
`R
`Surface No.
`13.592
`1
`3.238
`2
`-6.981
`3 2|:
`3.485
`4 a:
`41-389
`5
`-4.036
`6
`diaphragm 0°
`7
`17.988
`8
`1%?
`9
`-5. 170
`
`10
`11
`12
`13
`14
`15
`
`4.050
`2.479
`-10.343
`00
`00
`0°
`
`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
`
`Nd
`1.77250
`
`1. 49176
`
`1. 84666
`
`1. 8-1666
`1. 51633
`
`1. 84666
`1. 77250
`
`1. 51633
`
`* is a rotation-symmetrical aspherical surface.
`
`Aspherical surface data:
`
`No.3: K=0.00 A4= 0.30330-“10‘1 A6=-0.4312'5><10‘2
`A8=0.4632‘)XI0'3 A10—*O.24092 x10"
`
`No.4: K=0.00 A4: 0.50708?! 10“ A6=-0.52?5‘5ix210'2
`AB= 0.34087 1‘<.10'2 A10=-0.73846 .K10‘3
`
`[0030]
`
`14/31
`
`14/31
`
`
`
` [Table 4]
`
`Distance from
`optical axis
`
`
`
`
`Surface
`shape
`
`
`Paraxial spherical
`amount
`
`
`Aspherical
`amount
`
`
`
`
`
`
`
`
`
`(6)
`
`15/31
`
`
`
`I»
`" . 30000
`I»." . 40000
`s.I
`
`. 50000
`
`0. 054639
`0. 073154
`
`0. 089673
`
`-0. 389766
`-0. 425517
`
`-0. 402.997
`
`0. 11-44405
`0. 499671
`
`0. 551770
`
`[0031] [“10ng Example 3] Figure 11 shows a configuration of Working Example 3 of the
`super wide—angle lens system of the present invention. A specific configuration of this 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 of aberrations
`thereof.
`
`[0032]
`
`[Table 5]
`
`Fmsl: 1.3
`f=1.00
`W=58.5
`
`f5 = 2.
`Surface No.
`
`1
`
`'79
`
`(
`
`11.660
`
`3.374
`-8.060
`3.032
`41.339
`-3.881
`00
`
`35.148
`3.032
`'4.790
`4.000
`2.435
`-11.318
`00
`00
`DO
`
`0. 364
`1.637
`3. 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. 541706
`1. 51633
`
`1. 346(1)
`1. 77250
`
`1. 51633
`
`* is a rotation-symmetrical aspherical surface.
`
`Aspherical surface data:
`No.3: K=0.00 A4= 0.304851-'10‘1 Ab=-0.259252-110'3
`A8=0. 34634
`10‘ 3 A10=-0.11117
`.‘10-4
`No.4: K=0.00 M= 0.44252‘- 10" Ab=-0.58852'-- 10":
`A8: 0.39420 * 10'E A10=-0.79700
`.103
`
`[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. 213000
`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. 037713
`-0. 014479
`0. 001185
`0. 019254
`0. 039585
`0. 061843
`
`0. 085399
`
`-0. 122519
`-0. 140808
`
`-0. 160405
`-0. 181320
`—0. 203563
`-0.227146
`-0.252081
`—0. 378381
`-0. 306059
`-0. 3351 31
`-0. 365612
`-0. 397520
`-0. 430872
`
`-0. 465686
`
`0-062488
`0. 079846
`
`0.100111
`0. 123-156
`0. 150040
`0.180013
`0.213513
`0. 250668
`0. 291580
`0- 336316
`0. 384866
`0. 437105
`0. 492715
`
`0. 551085
`
`[0034] [Working Example 4] Figure 16 shows a 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 of this
`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 of aberrations
`thereof.
`
`[0035]
`
`[Table 7]
`
`FN,_.=1: 1. 3
`f=1.00
`hl=58.1
`
`fn=2.90 (=0.422/1.51633*2.622)
`
`Surface No.
`1
`2
`3
`4
`5
`6
`
`7
`8
`9
`10
`11
`12
`13
`14
`15
`
`R
`17.000
`2. 016
`40.103
`6. 003
`46.636
`-3. 553
`
`95.609
`2.691
`-3.867
`4.862
`2.512
`-8.951
`00
`00
`0°
`
`* is a rotation-symmetrical aspherical surface.
`
`Nd
`1.77150
`-
`1.49176
`-
`1.84666
`-
`
`1.84666
`1. 51633
`-
`1.84666
`1.77.350
`-
`1. 51633
`-
`-
`
`:2 ,I
`49.6
`-
`57.4
`-
`23.8
`-
`
`23.8
`64.1
`-
`23.8
`49.6
`-
`64.1
`-
`-
`
`[J
`0.500
`1. 793
`1.149
`1.950
`1.300
`1.880
`
`0.300
`2.000
`0.030
`0.300
`1.300
`0.000
`0.1122
`2.6%
`-
`
`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. 30000
`0.90000
`1.00000
`1 . 10000
`
`1 . 30000
`1 . 30000
`1 . 40000
`1 . 50000
`1 . 60000
`
`1 . 70000
`1 . 80000
`
`-0. 009418
`-0. 014383
`
`-0. 019836
`-0. 025827
`-0. 032049
`-0. 038241
`—0. 044148
`—0. 049517
`
`-0. 054104
`-0. 057680
`-0. 060032
`-0. 060962
`-0. 060294
`
`-0. 057864
`-0. 053523
`
`-0. 009933
`-0. 015524
`
`-0. 02.2364
`-0. 0304 55
`-0. 039301
`-0.050406
`-0.06ET5
`—0. 075115
`
`-0. 089831
`-0. 105530
`-0. 122519
`-0. 140303
`-0.1(;0405
`
`-0. 131320
`-0. 203563
`
`0. 000514
`0. 001241
`
`0. 002538
`0. 004627
`0. 007751
`0.012164
`0.018127
`0. 025898
`
`0. 035726
`0. 047849
`0. 062488
`0. 079346
`0.100111
`
`0. 133456
`0. 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
`
`—6. 981
`—7. 296
`Condition (1)
`3. 0330x104
`WWW 4.1500x10"
`Conditio-IG)
`‘7. 2169x10"
`'4. 3125X10"
`
`C Him (4)
`Condition (5)
`Condition (6)
`:
`|‘tion(7)
`Condition (8)
`
`1. 0529X10' '
`2. 549
`
`4. 6329x10' ‘
`2. 907
`
`2.400
`529. 729
`4. 118
`
`2. 479
`25. 228
`4. 178
`
`Condition (1)
`
`Working Example 3 Working Example 4
`
`Condition (2)
`
`‘8. 050
`
`Condition (3)
`Condition (4)
`C mm)
`C
`lion (6)
`_
`_
`Condition (7)
`_
`_
`mm“)
`
`2.0485X10'a
`'2. 5925X 10. .
`- 4
`2. 4634X 10
`3. 022
`2.425
`
`27. 255
`4.229
`
`-10. 108
`
`8. 88]!»(10’I
`"2. 7110 X 10. I
`- a
`7. 9690X10
`2. 691
`2. 512
`
`25. 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° and fast at an F-number of 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]
`
`
`
`
`
`
`
`
` - {22
`
`.02
`
`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
`
`