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    • 4. 发明授权
    • Compact vari-focal photographic lens system
    • 紧凑型变焦摄影镜头系统
    • US4653870A
    • 1987-03-31
    • US707867
    • 1985-03-04
    • Masaki ImaizumiHiroshi TakaseToru Fujii
    • Masaki ImaizumiHiroshi TakaseToru Fujii
    • G02B15/10G02B15/14G02B15/02
    • G02B15/10
    • A compact vari-focal photographic lens system comprising a master lens system and an auxiliary lens group wherein the master lens system comprises a front lens unit having positive refractive power and a rear lens unit having negative refractive power, the compact vari-focal photographic lens system being arranged to vary the focal length of the lens system as a whole by inserting and removing the auxiliary lens group to and from the image side of the master lens system and arranged that the overall length of the lens system is short, it is possible to vary the focal length without moving the stop mechanism, and aberrations are corrected satisfactorily favorably, the compact vari-focal photographic lens system being suitable for the use with popular cameras.
    • 一种紧凑型变焦摄影透镜系统,包括主镜头系统和辅助镜头组,其中主镜头系统包括具有正屈光力的前透镜单元和具有负屈光力的后透镜单元,紧凑型变焦摄影透镜系统 被布置为通过将辅助透镜组插入到主透镜系统的像侧并从主透镜系统的像侧移除来改变透镜系统的焦距,并且布置为透镜系统的总长度短, 在不移动停止机构的情况下改变焦距,并且令人满意地校正像差,紧凑型变焦摄影透镜系统适合于与流行的相机一起使用。
    • 7. 发明授权
    • Wide-field eyepiece lens system
    • 广视目镜系统
    • US5557464A
    • 1996-09-17
    • US505396
    • 1995-07-21
    • Masaki Imaizumi
    • Masaki Imaizumi
    • G02B25/00
    • G02B25/001
    • A wide field eyepiece lens system composed, in order from a side of an objective lens system, of a first lens unit which is composed of a plurality of lens elements and has a diverging function, and a second lens unit which is composed of a plurality of lens elements and has a converging function. The eyepiece lens system has an apparent field angle of 75.degree. to 80.degree., an eye relief of 0.95 f or longer and aberrations favorably corrected over an entire range of a visual field thereof including marginal portions, and is configured so as to satisfy the following conditions (1) and (2):-8.0
    • 一种广视场目镜系统,从物镜系统的一侧开始,由多个透镜元件组成并具有发散功能的第一透镜单元和由多个透镜组成的第二透镜单元 的透镜元件并具有会聚功能。 目镜透镜系统具有75°至80°的视场角,0.95f以上的眼睛仰角,并且在包括边缘部分的视野的整个范围内有利地校正像差,并且被配置为满足以下 条件(1)和(2):-8.0
    • 8. 发明授权
    • Compact zoom lens system
    • 小型变焦镜头系统
    • US5148321A
    • 1992-09-15
    • US677658
    • 1991-03-29
    • Hisashi GotoMasaki ImaizumiShigeru Kato
    • Hisashi GotoMasaki ImaizumiShigeru Kato
    • G02B13/18G02B15/163G02B15/20
    • G02B15/163
    • A compact zoom lens system comprising, in the order from the object side, a first lens unit having a positive refractive power, an aperture stop, a second lens unit having a positive refractive power and a third lens unit having a negative refractive power; and adapted so as to perform variation of focal length from the wide position to the tele position by moving the first lens unit and the third lens unit from the image side toward the object side, and displacing the second lens unit and the aperture stop so as to widen the airspace reserved between the first lens unit and the second lens unit, and narrow the airspace reserved between the second lens unit and the third lens unit. This zoom lens system has a total length shortened by thinning the first lens unit.
    • 一种紧凑型变焦透镜系统,包括从物体侧开始具有正屈光力的第一透镜单元,孔径光阑,具有正折光力的第二透镜单元和具有负屈光力的第三透镜单元; 并且适于通过将第一透镜单元和第三透镜单元从图像侧朝向物体侧移动来执行从宽位置到远摄位置的焦距的变化,并且使第二透镜单元和孔径光阑移位,以便 以扩大在第一透镜单元和第二透镜单元之间保留的空间,并且使保留在第二透镜单元和第三透镜单元之间的空间变窄。 该变焦透镜系统通过使第一透镜单元变薄而缩短总长度。
    • 10. 发明授权
    • Focusing method for a telephoto lens system
    • 长焦镜头系统的聚焦方法
    • US4558928A
    • 1985-12-17
    • US558196
    • 1983-12-05
    • Masaki Imaizumi
    • Masaki Imaizumi
    • G02B13/00G02B13/02G02B9/64
    • G02B13/02G02B13/00
    • A focusing method for a telephoto lens system comprising a front lens group having positive refractive power, an intermediate lens group having negative refractive power, and a rear lens group having positive refractive power, the focusing method for telephoto lens system being arranged to divide the intermediate lens group into two subunits and to focus the lens system by moving those subunits toward the image side by varying the distance between those subunits, the focusing method thereby enabling to attain focusing with satisfactorily favorable aberrations up to an object at a short distance.
    • 一种用于长焦透镜系统的聚焦方法,包括具有正折光力的前透镜组,具有负折射光焦度的中间透镜组和具有正折光力的后透镜组,该长焦透镜系统的聚焦方法被布置成将中间 透镜组变成两个子单元并且通过改变这些子单元之间的距离将这些子单元移动到图像侧来聚焦透镜系统,因此聚焦方法能够以令人满意的良好的像差在短距离处获得满意的像差。