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42. 发明专利

CA1119032A WRITE AND READ OBJECTIVE LENS FOR HIGH DENSITY STORAGE 未知
公开(公告)号：CA1119032A
公开(公告)日：1982-03-02
申请号：CA347804
申请日：1980-03-17
申请人： DISCOVISION ASS
发明人： MICKELSON LEE
IPC分类号： G02B13/00 , G02B9/34 , G02B13/24 , G02B9/36
摘要： A write and read objective lens system for encoding and recovery of information upon a storage member comprising three single lenses and one achromatic doublet for which the working distance is large and exhibits excellent flatness of field and resolving power, the system including at least a first, second, third and fourth lens said first lens being a positive meniscus object lens having a concave surface positioned toward the object side, said second lens being a positive achromatic doublet, said third lens being a negative meniscus lens having a concave surface positioned toward the image side, said fourth lens being a positive image lens, said lens system being utilizable with a plurality of wavelengths of light, said lens system satisfying the following conditions.

44. 发明专利

DE2026938B2 未知
公开(公告)号：DE2026938B2
公开(公告)日：1975-05-07
申请号：DE2026938
申请日：1970-06-02
申请人： CANON K.K., TOKIO
发明人： KAWABE, TADASI, AKO, HYOGO , TAJIMA, AKIRA, KAWASAKI, KANAGAWA
IPC分类号： G02B13/00 , G02B9/36
摘要： The disclosed photographic lens assembly passes light of shorter wavelengths, one lens made of magnesium oxide crystal which forms positive lens in the lens assembly. A first lens group in the assembly is composed of a positive meniscus lens which is convex on the side of the object. A second lens group is composed of a positive and a negative lens cemented together. A third lens group is composed of a negative lens cemented to a positive lens with the group overall being concave toward an object. A fourth lens group is composed of a double convex lens. The cemented surfaces of the second group and of the third group have curvatures whose algebraic sum is less than a given value.

46. 发明专利

DE2235652A1 未知
公开(公告)号：DE2235652A1
公开(公告)日：1973-03-15
申请号：DE2235652
申请日：1972-07-20
申请人： POLAROID CORP
发明人： BAKER JAMES GILBERT
IPC分类号： G02B13/00 , G02B9/36
摘要： 1331898 Lens systems POLAROID CORP 29 June 1972 [28 July 1971] 30559/72 Addition to 1252086 Heading G2J A four element lens system has the design parameters as shown in Fig. 2 where the symbols are as shown in Fig. 1, lens I is movable for focusing.

47. 发明专利

JP2002287022A COLOR IMAGE READ LENS AND DEVICE USING THE SAME 失效
公开(公告)号：JP2002287022A
公开(公告)日：2002-10-03
申请号：JP2001085465
申请日：2001-03-23
申请人： FUJI PHOTO OPTICAL CO LTD
发明人： MORI MASAO
IPC分类号： G02B13/24 , G02B9/34 , G02B9/36 , G06T1/00 , H04N1/028 , H04N1/04
摘要： PROBLEM TO BE SOLVED: To obtain excellent curvature of a field and on-axis chromatic aberration by using glass which has large abnormal dispersion for a negative lens of a cemented lens and to suppress aberration variation due to power variation in a well-balanced state by maintaining the symmetry of lens systems before and after a stop and then correcting deterioration of distortion and power chromatic aberration. SOLUTION: This lens is constituted by arraying a 1st lens group G1 composed of a 1st lens L1 , a 2nd lens group G2 which is constituted by cementing a 2nd biconvex lens L2 and a 3rd biconcave lens L3 and convex to the object side, a stop 1, a 3rd lens group G3 which is constituted by cementing a 4th lens L4 and a 5th positive lens L5 and convex to the image side, and a 4th lens group G4 composed of a 6th positive lens L6 which is convex to the image side in order from the object side and satisfies specific conditional expressions including 0.0006

49. 发明专利

JPS5860716A BEHIND STOP LENS 失效
公开(公告)号：JPS5860716A
公开(公告)日：1983-04-11
申请号：JP15977381
申请日：1981-10-07
申请人： NIPPON KOGAKU KK
发明人： WAKAMIYA KOUICHI
IPC分类号： G02B9/34 , G02B9/36
摘要： PURPOSE:To obtain a compact lens where various aberrations are corrected well, by satisfying prescribed conditions in the lens system consisting of a positive meniscus lens, a positive meniscus lens, a biconcave lens, a biconvex lens, and a negative meniscus lenses which are arranged in order form the object side. CONSTITUTION:In the lens system consisting of 4-group 5 lenses where a positive meniscus lens, a positive meniscus lens, a biconcave lens, a biconvex lens, and a negative meniscus lens are arranged in order from the object side and fourth and fifth lenses are stuck to each other and a stop is provided in the image side, conditions of inequalities (1)-(9) are satisfied. In inequalities, (f), fi, fi,j, ri, di, ni, and nui are the resultant focal length of lenses, the focal length of the first lens, the resultant focal length of the i-th lens- the j-th lens, the radius of the curvature of the i-th face, the interval of the i-th face, the refractive index of the i-th lens, and the Abbe's number of the i-th lens respectively. Thus, a behind stop lens which is compact and has various aberrations corrected well is obtained.

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