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    • 4. 发明授权
    • Ultrawide angle zoom objective
    • 超宽角缩放目标
    • US4477153A
    • 1984-10-16
    • US375667
    • 1982-05-06
    • Shigeyuki SudaKeiji Ikemori
    • Shigeyuki SudaKeiji Ikemori
    • G02B13/04G02B13/18G02B15/16
    • G02B15/161G02B13/04G02B13/18
    • Disclosed is a two-component zoom objective having a first lens component of negative power and a second lens component of positive power with the variable air separation between the first and second components effecting zooming. The aforesaid first lens component is constructed with four lenses. The first lens counting from the front is given an aspheric surface, and the air lens defined by the second and third lenses counting from the front and the four lenses in the aforesaid first lens component are appropriately configured to increase the angular field up to an ultrawide angle, while still permitting good correction of aberrations.
    • 公开了具有负功率的第一透镜分量和正功率的第二透镜分量的双分量变焦目标,其中第一和第二分量之间的可变空气分离实现变焦。 上述第一透镜部件由四个透镜构成。 从前面计数的第一透镜被给予非球面,并且由前面计数的第二和第三透镜限定的空气透镜和上述第一透镜部件中的四个透镜被适当地构造成将角度场增加到最远 角度,同时仍然允许良好的像差校正。
    • 9. 发明授权
    • Photographing apparatus having a trimming photographic mode
    • 具有修整照相模式的摄影装置
    • US5392082A
    • 1995-02-21
    • US236147
    • 1994-05-02
    • Keiji IkemoriTakeshi Koyama
    • Keiji IkemoriTakeshi Koyama
    • G03B17/24G03B1/18
    • G03B17/24G03B2206/004G03B2217/243
    • A photographing apparatus having at least two modes, i.e., a first mode for setting and photographing a first photographing area of a photographing area photographed by a photo-taking optical system, and a second mode for setting and photographing a second photographing area smaller than the first photographing area. The apparatus has in succession from the object side a first lens unit and a second lens unit. The first lens unit comprises a positive lens of positive refractive power and a negative lens of negative refractive power, and the second lens unit comprises a positive lens. The spacing between the first lens unit and the second lens unit is varied during the changeover between the first mode and the second mode.
    • 具有至少两种模式的拍摄装置,即用于设置和拍摄由拍摄光学系统拍摄的拍摄区域的第一拍摄区域的第一模式,以及用于设置和拍摄小于 第一拍摄区域。 该装置从物体侧连续地连接第一透镜单元和第二透镜单元。 第一透镜单元包括正屈光力的正透镜和负折光力的负透镜,并且第二透镜单元包括正透镜。 在第一模式和第二模式之间的切换期间,第一透镜单元和第二透镜单元之间的间隔是变化的。
    • 10. 发明授权
    • Magnification changing lens
    • 放大镜更换镜头
    • US5078481A
    • 1992-01-07
    • US575659
    • 1990-08-31
    • Hiroki NakayamaKeiji Ikemori
    • Hiroki NakayamaKeiji Ikemori
    • G02B15/177
    • G02B15/177
    • This specification discloses a magnification changing lens which has, in succession from the object side, a first lens unit of negative refractive power, a second lens unit of positive refractive power, a third lens unit of negative refractive power and a fourth lens unit of positive or negative refractive power and in which at least the second and third lens unit are moved toward the object side to thereby accomplish the magnification change from the wide angle end to the telephoto end. This magnification changing lens particularly satisfies the following condition:0.13
    • 本说明书公开了一种放大倍率改变透镜,其从物体侧依次具有负折光力的第一透镜单元,正折光力的第二透镜单元,负折射光焦度的第三透镜单元和正折射力的第四透镜单元 或负屈光力,并且其中至少第二和第三透镜单元朝向物体侧移动,从而实现从广角端到远摄端的放大率变化。 该倍率变化透镜特别满足以下条件:0.13