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Finite-distance-zoom-lens-system

Apparatus for limiting the output signal frequency band of an optical sensor

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Finite distance zoom lens system

Details

Inventors: Itoh, Takayuki;
Assignee: Asahi Kogakukogyo Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Corbin; John K.
Assistant Examiner: Gass; Rebecca D.
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas

A finite distance zoom lens system including a first lens group having a negative focal length and a second lens group having a positive focal length. The two lens groups are mechanically movable to thereby vary the focal length while maintaining constant the distance between the object surface and the image surface. The zoom lens system has a magnification of about 1/10 to 1/5 times.

DETAILED DESCRIPTION An object of the present invention is to eliminate the above noted defects by providing a novel zoom lens system.
Also, the zoom lens of finite distance to which the present invention is directed is particularly usable in a facsimile.
In a zoom lens for a facsimile, by disposing some sensors on the image surface, it is possible to telegraphically transfer information contained on an original without moving the variously sized original papers together with the sensors.
If the image and the object are inverted, it is possible to use the lens system as an enlargement zoom lens enabling the magnification to be continuously changed.

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