Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1991-05-23
1992-11-10
Hayes, Monroe H.
Photocopying
Projection printing and copying cameras
Illumination systems or details
359708, 359742, G03B 2754
Patent
active
051628449
ABSTRACT:
An image projection apparatus including a projection lens system projecting an image of a transparent original onto an image receiving surface with a variable magnification and an illumination system illuminating the original. The projection lens system includes a plurality of projection lenses of different magnifications in an interchangeable manner or a zoom lens. The illumination system including a light source unit, a divergent lens unit and a convergent aspherical lens unit so that Kohler illumination can be realized in any magnification. A refracting power of the convergent aspherical lens unit becomes smaller than a spherical lens unit with an increase in a distance from an optical axis. The convergent aspherical lens unit may be includes a Fresnel lens.
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Hayes Monroe H.
Minolta Camera Co. Ltd.
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