Two-drum type copying machine having improved illumination effic

Details Two-drum type copying machine having improved illumination effic Two-drum type copying machine having improved illumination effic

1981-09-22

1983-08-23

Moses, R. L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 49, 355 51, 355 66, G03G 1500

Patent

active

044000804

ABSTRACT:
A two-drum copying machine having rotatable memory and transfer drums in which an optical path between an object point on the memory drum and an image point on the transfer drum is arranged obliquely with respect to the optical axis of a lens focusing light reflected from the object point onto the image point. A rotatable mirror is first set in a position to reflect light from an original to be copied onto the memory drum. After the memory drum has been rotated through one complete revolution and an image of the original formed thereon, a light source is turned on to project light directly onto the memory drum to illuminate the image. The mirror is then rotated out of the optical path to open the optical path through the lens between the object and image points. In a preferred embodiment, the sum of the angles of incidence and reflection of light at the object point is set to be twice the angle formed between the optical path and the optical axis of the lens. An elliptical curved mirror may be used to direct light from the light source onto the memory drum.

REFERENCES:
patent: 3615128 (1971-10-01), Bhagat
patent: 3694073 (1972-09-01), Bhagat
patent: 3752573 (1973-08-01), Miller
patent: 3936171 (1976-02-01), Brooke
patent: 4134670 (1979-01-01), Spinelli
patent: 4162843 (1979-07-01), Inoue et al.
patent: 4180318 (1979-12-01), Matsumoto et al.
patent: 4320955 (1982-03-01), Kay

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