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AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorsRyota Ogawa, Michiro Oishi, Yasunori Arai
Estimating the term…
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.
In a copying machine of the type having a rotatable memory drum having an axis of rotation passing through the center thereof, a rotatable transfer drum having an axis of rotation passing through the center thereof, a lens having an optical axis and positioned in an optical path between said memory and transfer drums, and a light source for projecting light onto said memory to illuminate said memory drum, which light is reflected from said memory drum through said lens to said transfer drum, the improvement characterized in that an optical path through said lens connecting an object point on said memory drum from which light from said light source is reflected and an image point on said transfer drum is arranged obliquely to said optical axis of said lens.
Dependencies are inferred from the claim text.