Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1986-02-24
1987-12-29
Hayes, Monroe H.
Photocopying
Projection printing and copying cameras
Illumination systems or details
355 71, G03B 2772
Patent
active
047164425
ABSTRACT:
In an exposure device, the light rays emitted from a light source and radiated at an illumination surface, the light rays directly incident to the illuminated surface, the light rays incident to the illuminated surface at greater angles of incidents and the light rays which cause the overexposure of the object to be exposed are interrupted by an optical shielding plate interposed between the light source and the illuminated surface so that the unwanted light rays can be cut-off.
The illuminated surface has a specific illumination distribution pattern inherent to the light source used so that the integrated quantities of light rays each incident to each point on the surface of the object to be exposed do not become uniform. According to the present invention, the object to be exposed or reciprocated across the illuminated surface and the angular position of the light sources varied in the forward and return strokes so that the illumination distribution pattern of the exposure light emitted from the light source is also varied. In addition, upon rotation of the light source an angle of incidents of each exposure light ray which is not perpendicular to the surface of the object to be exposed is inclined to the opposite direction to the surface of the object to be exposed.
REFERENCES:
patent: 3241437 (1966-03-01), Thiels
patent: 4090788 (1978-05-01), Massengeil
patent: 4113379 (1978-09-01), Harada et al.
patent: 4171905 (1979-10-01), Boschet
patent: 4194835 (1980-03-01), Shiode
Hayes Monroe H.
ORC Manufacturing Co. Ltd.
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