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Patent Searching and Data


Title:
EXPOSURE DEVICE OF COPYING MACHINE
Document Type and Number:
Japanese Patent JPS5612663
Kind Code:
A
Abstract:

PURPOSE: To correct the unevenness of illuminance by constituting the reflecting surface of a curved face reflecting shade by elliptical curved faces, and leading the focusing point of the reflected light from the other elliptical curved face to a remote end when the focusing point of the reflected light from an arbitrary elliptical curved face is at the center of the original plane.

CONSTITUTION: A curved face reflecting shade 10 is constituted by two elliptical curved faces 11, 12 of different shapes. With this curved face reflecting shade 10, the light emitted from a light source 14 and reflected by the elliptical curved face 11 condenses on the focusing point 15 on a principal axis 13 and spreads thereform. The one reflected by the elliptical curved face 12 condenses at the focusing point 16 which is on the principal axis 13 and is remote from the focusing point 15 when viewed from the light source 14, thence it spreads and advances progressively. Hence, even at the time of irradiating the position P2 at the remote end of the original plane remote from the light source 14, the focusing point 16 being a substantial light source is near the position P2; therefore, the decrease in illuminance is small, and the unevenness in the illuminance distribution of the entire part of the original plane is corrected.


Inventors:
TENMIYOU MASAYUKI
Application Number:
JP1979000088482
Publication Date:
February 07, 1981
Filing Date:
July 12, 1979
Export Citation:
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Assignee:
RICOH KK
International Classes:
G03B27/54; G03G15/04; (IPC1-7): G03G15/04