Telecentric image-forming system having varible magnifications

Details Telecentric image-forming system having varible magnifications Telecentric image-forming system having varible magnifications

1988-06-17

1989-09-19

Arnold, Bruce Y.

350427, G02B 1322, G02B 1118

Patent

active

048675458

ABSTRACT:
The image-forming magnification of a telecentric optical system, for use in an exposure apparatus such as a projecting apparatus, a laser plotter and the like is determined by the focal length ratio. An error in processing and arranging lenses necessitates adjustment of the image-forming magnification. According to the present invention, the magnification may be greatly varied. According to the present invention, a lens movable along the optical axis and having a positive focal length is placed at a position corresponding to the point at which the focal points of two lens groups coincide with each other. The image-forming magnification ratio can be varied by moving the lens while the distance between an object and an image is kept constant. Characteristic features of telecentric optical systems are maintained.

REFERENCES:
patent: 4386828 (1983-06-01), Hirose

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