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41. 发明专利

JPH03241306A VARIABLE POWER LENS 失效
公开(公告)号：JPH03241306A
公开(公告)日：1991-10-28
申请号：JP3739190
申请日：1990-02-20
申请人： OLYMPUS OPTICAL CO
发明人： AOKI NORIHIKO
IPC分类号： G02B9/00 , G02B15/16
摘要： PURPOSE:To correct the chromatic aberration without using a lens of a different code by using a refractive index distribution type lens having a refractive index distribution in the direction vertical to an optical axis in a lens group having at least one negative refracting power, and allowing it to satisfy a specific condition. CONSTITUTION:The variable power lens is constituted of a first lens group having positive refracting power, a second lens group having positive refracting power, a third lens group having positive refracting power, and a fourth lens group having negative refracting power in order from an object side, and in a fourth lens group, a refractive index distribution type lens for satisfying expressions I, II is used. In this regard, phiM, phiH, phiG, and phin denote refracting power of a medium of the refractive index distribution type lens, refracting power at the time when the refractive index distribution type lens is a homogeneous lens having a refractive index on its optical axis, refracting power of the whole refractive index distribution type lens, and refracting power of the whole lens group having negative refracting power in which at least one piece of refractive index distribution type lens is used, respectively. In such a way, the chromatic aberration can be corrected satisfactorily without using a lens of refracting power of a different code.

42. 发明专利

JPH03139607A POWER VARYING LENS 失效
公开(公告)号：JPH03139607A
公开(公告)日：1991-06-13
申请号：JP27717389
申请日：1989-10-26
申请人： OLYMPUS OPTICAL CO
发明人： AOKI NORIHIKO , TSUCHIDA HIROBUMI , MATSUZAKI HIROSHI
IPC分类号： G02B9/00 , G02B13/18 , G02B15/20
摘要： PURPOSE:To obtain a wide field angle at the wide-angle end and to increase the power variation ratio by providing a distributed index lens which has a refractive index distribution at right angles to the optical axis of at least one lens in a lens system. CONSTITUTION:The power varying lens consists of a 1st lens group which has negative refracting power, a 2nd lens group which has positive refracting power, a 3rd lens group, a 4th lens group, and a stop which is arranged closer to the image side than the 3rd lens group in order from the object side, and varies in power by varying the intervals of the respective lens groups, and the distributed index lens which has the refractive index distribution at right angles to the optical axis is provided in the lens system. The radial type distributed index lens has power in its medium and the radius of curvature can be made larger or smaller than that of a homogeneous lens with the same power, which is utilized to facilitate the compensation of various aberrations more. Consequently, the power varying lens for a camera which has the large power variation rate and the wide field angle at the wide-angle end is obtained.

43. 发明专利

JPH0330842B2 失效
公开(公告)号：JPH0330842B2
公开(公告)日：1991-05-01
申请号：JP4184083
申请日：1983-03-14
申请人： KOGYO GIJUTSUIN
发明人： KIKUCHI KEISUKE
IPC分类号： G02B9/04 , G02B3/00 , G02B6/42 , G02B9/00

44. 发明专利

JPH0396911A SYSTEMATIC GENERATING METHOD FOR EQUIVALENT OPTICAL SYSTEM 失效
公开(公告)号：JPH0396911A
公开(公告)日：1991-04-22
申请号：JP23443489
申请日：1989-09-08
申请人： AGENCY IND SCIENCE TECHN
发明人： FUKUI YUKIO , TAKEDA TSUNEHIRO , IIDA TAKEO
IPC分类号： G02B9/00 , G02B27/00
摘要： PURPOSE:To increase the degree of freedom of design by replacing one lens to be replaced in an optical system with a composite lens so that it overlaps with an apparent lens. CONSTITUTION:A thin lens with a focal length (f) is equivalent to a thin concave lens with -f eventually and when a convex lens is regarded as an equivalent concave lens, principal point positions H1 and H2 are 2f away from the lens. When a thick lens L3 is regarded as an equivalent concave lens, the principal point positions H1 and H2 are 2f away from the principal point positions H and H' of the thick lens L3. Further, when the distance (d) between the two thin convex lenses is made larger than the sum of the focal lengths of the two lenses, the lenses become equivalent to one thick concave lens, the principal point positions are at distances h1 and h2 from respective lens surfaces, and the principal point positions of the thick convex lens equivalent to the thick concave lens are an absolute value 2f inside from the principal point positions of the thick concave lens, so one convex lens is replaceable with the equivalent two combined lenses. Thus, the equivalent optical system consisting of an optional number of lenses can be generated from the simplest optical system.

45. 发明专利

JPH0317609A COMPACT ZOOM LENS WITH HIGH VARIABLE POWER RATE 失效
公开(公告)号：JPH0317609A
公开(公告)日：1991-01-25
申请号：JP15058889
申请日：1989-06-15
申请人： OLYMPUS OPTICAL CO
发明人： AOKI NORIHIKO
IPC分类号： G02B9/00 , G02B13/18 , G02B15/16
摘要： PURPOSE:To offer the compact zoom lens system which has various aberrations compensated sufficiently from the wide-angle end to the telephoto end regardless of the high variable power rate and is extremely short in the overall length by using only lenses with negative refracting power for a lens group which has negative refracting power and is closest to the image side, and further using at least one distributed refractive index type lens in the lens group. CONSTITUTION:The zoom lens whose variable power ratio is 3 consists of a 1st lens group I with positive refracting power, a 2nd lens group II with positive refracting power, and a 3rd lens group III with negative refracting power. Further, the 3rd lens group consists of three lenses having negative refracting power so as to shorten the overall length of the lens system, and the distributed refractive index type lens having negative refracting power is as the lens which is closest to the object side in the lens group. Thus, the distributed refractive index type lens whose medium has negative refracting power is used in the 3rd negative lens group to decrease the curvature rate of the lens surface and prevent positive distortion from being generated, and negative distortion is generated by the medium to correct the distortion.

46. 发明专利

JPH0315013A ACHROMATIC LENS FOR ULTRAVIOLET RAY 失效
公开(公告)号：JPH0315013A
公开(公告)日：1991-01-23
申请号：JP6514090
申请日：1990-03-15
申请人： TOSOH CORP
发明人： YAMADA SHUSUKE , TSUKUMA KOJI , FUJII TETSUO , KONDO SHINICHI , SEGAWA HIDEAKI , HONDA KEIJI
IPC分类号： G02B9/00
摘要： PURPOSE:To produce the achromatic lens of a large diameter and high accuracy by constituting the lens of quartz glass contg. high-purity quartz glass or fluorine-contg. high-purity quartz glass and germanium dioxide. CONSTITUTION:The lens is constituted of the two kinds; the high-purity quartz glass of >=99.9% purity or the fluorine-contg. high-purity quartz glass of >=99.9% purity and the quartz glass contg. the germanium dioxide. Namely, convex lenses 1, 3 having a large Abbe number and a concave lens 2 consisting of the glass having the small Abbe number are combined. The convex lenses 1, 3 are formed of the non-added quartz glass or the fluorine-contg. quartz glass and the concave lens 2 is formed of the germanium-contg. quartz glass and the achromatic lens is constituted by combining both. The working is easier than with the lens formed by using fluorite and the finishing by polishing with high accuracy is possible. The larger aperture diameter is possible.

47. 发明专利

JPH02284107A DISTRIBUTED REFRACTIVE INDEX TYPE LENS SYSTEM 失效
公开(公告)号：JPH02284107A
公开(公告)日：1990-11-21
申请号：JP10667189
申请日：1989-04-26
申请人： CANON KK
发明人： ARAKI KEISUKE
IPC分类号： G02B3/00 , G02B9/00 , G02B27/18
摘要： PURPOSE:To well correct an offaxial aberration which is the drawback of a distributed refractive index type single lens by forming the end faces of the single lens as concave faces, i.e. providing a negative refracting power on these faces. CONSTITUTION:The lens length z0 of the distributed refractive index type lens 3 which is highest in the refractive index distribution n(r) on the z-axis, i.e. the optical axis and is lowered in the refractive index with the rotationally symmetrical distribution of n (r, z)=n0 (z)x {1-g (z)r +h4(z)g (z)r +h6(z)g +(z)r +...} as removed from the optical axis by a distance r is determined in the range of equation I to form an erecting real image 2 and the concave refracting power is provided on both end faces 4, 4'. The curvature of field at the meridian cross section which is heretofore not corrected is well corrected simultaneously with the spherical aberration in this way and the range of the images usable with the single lens is widened.

48. 发明专利

JPH02124509A ZOOM LENS 失效
公开(公告)号：JPH02124509A
公开(公告)日：1990-05-11
申请号：JP20458088
申请日：1988-08-19
申请人： OLYMPUS OPTICAL CO
发明人： ISHII ATSUJIROU , INANOBE TSUTOMU
IPC分类号： G02B9/00 , G02B15/16 , G02B15/177
摘要： PURPOSE:To compensate a 1st group of a small number of lens elements and to compensate an off-axis aberration excellently by providing at least one distributed index lens which varies in refractive index with the distance of the 1st group moves away from the optical axis. CONSTITUTION:The lens system which consists of plural groups, includes a 1st group with negative refracting power and a 2nd group with positive refracting power in order from the object side, and varies in power by varying the gap between the 1st and 2nd groups, this lens system has at least one distributed index lens whose 1st group is expressed by I, and inequalities II holds. Here, n1(d) is constant of refractive index distribution on the d line, f1 is the focal length of the 1st group, and fa is the focal length of the 1st lens group when the distributed index lens in the 1st group is replaced with a lens made of a homogeneous medium with a refractive index n0. Further, (r) is the distance from the center of the lens in a radial direction, n(r) is the refractive index at a position of the radius (r) from the center of the lens, and n0, n1, n2... are constants. Consequently, the number of lenses of the 1st group with negative refracting power is decreased to compensate the aberrations excellently.

49. 实用新型

JPH0116087Y2 失效
公开(公告)号：JPH0116087Y2
公开(公告)日：1989-05-12
申请号：JP6811679
申请日：1979-05-21
IPC分类号： G03B7/20 , G02B9/00 , G03B17/12 , G03B17/14

50. 发明专利

JPS6440912A LENS FOR OPTICAL RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPS6440912A
公开(公告)日：1989-02-13
申请号：JP19758687
申请日：1987-08-07
申请人： NIPPON SHEET GLASS CO LTD
发明人： ICHIKAWA HIROYUKI
IPC分类号： G02B13/00 , G02B9/00 , G02B9/08 , G11B7/135
摘要： PURPOSE:To enable an objective lens to function as a high numerical aperture (NA) lens when used even if the NA of the objective itself is low by converging divergent light from a lens source into not parallel light, but convergent light through a collimator lens and converging luminous flux before it is made incident on the objective. CONSTITUTION:This lens consists of two single lenses 2 and 4. The divergent light emitted by the light source 1 is incident on a 1st lens 2, and converted by this 1st lens 2 into convergent light, which is incident on a 2nd lens 4, converged by this 2nd lens 4, and focused on the recording surface 5A of a recording medium 5. Thus, the convergent light is made incident on the 2nd lens 4 and then even when the lens with effective NA is used as the 2nd lens 4, the light is converged on an information recording surface 5A with a large NA.

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