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1. 发明专利

JP2004199092A Imaging lens 审中-公开
公开(公告)号：JP2004199092A
公开(公告)日：2004-07-15
申请号：JP2004070406
申请日：2004-03-12
申请人： Enplas Corp , 株式会社エンプラス
发明人： SAITO TOMOHIRO
IPC分类号： G02B9/08 , G02B9/10 , G02B13/18
CPC分类号： G02B9/08 , G02B13/003
摘要： PROBLEM TO BE SOLVED: To provide an imaging lens which can be made small-sized and light-weight and can have manufacturability improved while maintaining optical performance. SOLUTION: A first lens 2 being a positive-power meniscus lens having the convex turned to the object side, a stop 3, and a second lens 4 being a meniscus lens having the convex turned to the image surface side are arranged in order from the object side, and they satisfy conditional formulas 1.25×fl≥L≥0.8×fl, 1.26×fl≥f 1 ≥0.85×fl, 0.8×d 1 ≥d 2 ≥0.35×d 1 , L≤6.25mm, d 1 ≥0.225×fl, and d 3 ≥0.242×fl, wherein L: overall length of the lens system, fl: focal length of the entire lens system, f 1 : focal length of the first lens 2, d 1 : center thickness of the first lens, d 2 : space between the first and second lenses, and d 3 : center thickness of the second lens. COPYRIGHT: (C)2004,JPO&NCIPI

2. 发明专利

JP2000266997A PHOTOGRAPHING LENS AND CAMERA USING SAME 失效
公开(公告)号：JP2000266997A
公开(公告)日：2000-09-29
申请号：JP7552499
申请日：1999-03-19
申请人： FUJI PHOTO FILM CO LTD
发明人： KOIKE KAZUMI
IPC分类号： G03C3/00 , G02B9/08 , G02B13/18 , G03B17/04
摘要： PROBLEM TO BE SOLVED: To provide a photographing lens of two-group two sheet constitution excellent in production aptitude, having high brightness of an image plane, and having restrained fluctuation in various kinds of aberrations. SOLUTION: This photographing lens 30 comprises a first meniscus-shaped lens 31 of positive refractive power with a convex face directed toward a object side, a diaphragm 33, and a second meniscus-shaped lens 32 of positive refractive power with a concave face directed toward the object. Both faces 32a, 32b of the second lens 32 are formed into a nonspherical shape. Respective conditions of '|f1|>f2' and 'R1>R2' are satisfied, where f1 is a focal distance of the first lens 31, f2 is a focal distance of the second lens 32, R1 is a curvature radius of a object-side lens face 31a in the first lens 31, and R2 is a curvature radius of an image-side lens face 31b of it.

3. 发明专利

JP3085787B2 失效
公开(公告)号：JP3085787B2
公开(公告)日：2000-09-11
申请号：JP16432892
申请日：1992-05-29
IPC分类号： G02B9/08 , G03B7/093 , H04N5/235 , H04N5/335 , H04N5/353 , H04N5/357 , H04N5/363 , H04N5/372 , H04N5/378

4. 发明专利

JP2000227547A PHOTOGRAPHIC LENS AND CAMERA USING THE SAME 失效
公开(公告)号：JP2000227547A
公开(公告)日：2000-08-15
申请号：JP2815599
申请日：1999-02-05
申请人： FUJI PHOTO FILM CO LTD
发明人： KOIKE KAZUMI
IPC分类号： G03B17/28 , G02B9/08 , G02B13/18 , G03C3/00
摘要： PROBLEM TO BE SOLVED: To provide a photographic lens of a 2 groups 2 lenses construction where illuminance of the image surface is bright and variation in various aberrations can be kept down without narrowing the angle of the photographic image. SOLUTION: In this photographic lens 30, a lens surface 31a on an image side of a first lens 31 positioned on an object side and either one of lens surfaces 32a of 32b of a second lens 32 positioned on the image side are formed to be an aspherical state. When a focal distance of the first lens 31 is f1, a focal distance of the second lens 32 is f2 and radius of curvatures of the lens surfaces 31a and 31b of the first lens 31 are each named R1 and R2, by fulfilling each condition of |f1|>f2 and R1>R2, the image surface illuminance can be made bright while still securing a photographic half image angle of about 34 deg. and balance of various aberrations can be kept in a good state. Deterioration of curvature of the image surface where a sphere is imperfect can be kept down since the lens surface 31a on the object side of the first lens 31 is not formed to be aspherical. Therefore, the curvature of the image surface of the photographic lens 30 can be eased without enlarging the quantity of curvature of a film surface and color aberrations of magnification due to the curvature of the film surface can be reduced.

5. 发明专利

JPH10111449A LENS SYSTEM 失效
公开(公告)号：JPH10111449A
公开(公告)日：1998-04-28
申请号：JP26704997
申请日：1997-09-30
申请人： EASTMAN KODAK CO
发明人： LEE ROY ESTELLE , BABARA JEN KAUSUUFUTO
IPC分类号： G02B9/12 , G02B9/08 , G02B13/00 , G02B13/18
摘要： PROBLEM TO BE SOLVED: To obtain a lens capable of obtaining excellent image quality, being miniaturized and having a short focal distance by making a rear lens unit not possessing a negative lens, and making front and rear lens units cooperate with each other so that the focal distance and the back focal distance of a lens system within a specified range may be attained. SOLUTION: This lens system 100 is provided with three lens parts 10 to 30 included in two lens units constituted of lens elements. The 1st lens unit is constituted of the lens part 10 and has negative power as a whole. The 2nd lens unit is constituted of two parts 20 and 30 and has positive power as a whole. An aperture diaphragm is put between the 1st and the 2nd lens units. In such constitution, the power of the front and the rear lens units is set so that the lens system may have the focal distance within 2 to 25mm and the back focal distance within about 80 to 120% of the focal distance.

6. 实用新型

JP2505405Y2 失效
公开(公告)号：JP2505405Y2
公开(公告)日：1996-07-31
申请号：JP7194488
申请日：1988-05-31
IPC分类号： G03B3/10 , G02B7/08 , G02B7/28 , G02B9/08 , G03B9/08 , G03B13/34

7. 实用新型

JPH0251312U 失效
公开(公告)号：JPH0251312U
公开(公告)日：1990-04-11
申请号：JP13018588
申请日：1988-10-04
IPC分类号： G03B13/36 , G02B7/09 , G02B9/08 , G03B3/00 , G03B9/08 , G02B7/11

8. 发明专利

JPH01211712A SOFT FOCUS LENS 失效
公开(公告)号：JPH01211712A
公开(公告)日：1989-08-24
申请号：JP3662388
申请日：1988-02-19
申请人： ASAHI OPTICAL CO LTD
发明人： HIRANO HIROYUKI
IPC分类号： G02B9/08 , G02B9/18 , G02B9/56 , G02B13/20
摘要： PURPOSE:To obtain excellent soft focus effect by composing the soft focus lens of a front group which consists of a positive and a negative lens and has positive power and a rear group which consists of a negative and a positive lens and has positive power in order from the object side and satisfying specific conditions. CONSTITUTION:The soft focus lens consists of the front group of 1-group of 2-element or 2-group of 2-element constitution which consists of the positive and negative lenses and has the positive power on the whole and the rear group of 1-group of 2-elements or 2-group of 2-element constitution which consists of the negative and positive lenses and has the positive power on the whole; and inequalities 1-3 hold. In the inequalities, rFF is the radius of curvature of the 1st surface of the front group, (f) the focal length of the whole system, P the Petzval's sum of the whole system when the focal length of the whole system is converted into 1.0, nu1 the Abbe number of the positive lens in the front group, and nu2 the Abbe number of the negative lenses in the front group. Consequently, the excellent soft focus effect is obtained.

9. 发明专利

JPS6311647B2 失效
公开(公告)号：JPS6311647B2
公开(公告)日：1988-03-15
申请号：JP10249379
申请日：1979-08-10
申请人： CANON KK
发明人： MOCHIZUKI NORITAKA , MINAMI SETSUO , MATSUI YOSHA , TANIGUCHI TADASHI
IPC分类号： G02B27/18 , G02B9/08 , G02B13/24 , G02B13/26 , G03B27/50 , G03G15/04 , G03G15/047

10. 发明专利

JPS635724B2 失效
公开(公告)号：JPS635724B2
公开(公告)日：1988-02-04
申请号：JP15728178
申请日：1978-12-18
申请人： CANON KK
发明人： MIDORIKAWA MITSUHIRO , TSUNODA ATSUO , MURASE HIDETOSHI , MOCHIZUKI NORITAKA , MINAMI SETSUO , MATSUI YOSHA , MORIWAKI MASAZUMI , SUZUTA MIKIO
IPC分类号： G03B27/50 , G02B3/00 , G02B9/08 , G02B27/18 , G03B27/32 , G03G15/04

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