Title:
LIGHTING OPTICAL SYSTEM FOR MICROREADER/PRINTER
Document Type and Number:
Japanese Patent JPH03210517
Kind Code:
A
Abstract:
PURPOSE:To improve an exposure speed and to increase the number of copies for a fixed time by inserting a toroidal lens having power into a condenser lens system at the time of reading and in the vertical direction of a slit at the time of printing. CONSTITUTION:In the state of the lighting optical system at the time of reading, a projection lens system 11, a microfilm 12 held between pressing plate glasses, the condenser lens system 13 formed by lenses 131 to 133 in an axially symmetrical lens system, and a light source 15 are arranged on an optical axis and a toroidal lens 133' is arranged out of the optical axis. At the time of printing, the lens 133' is inserted into the optical axis instead of the condenser lens 133 arranged on the light source 15 side to form an anamorphic lighting optical system 13'. When the toroidal lens 133' having strong power in the vertical direction of the slit is inserted into the condenser lens system 13 to illuminate a target with high illuminance at the time of printing, the exposure speed can be increased. Consequently, the number of copies can be increased.
Inventors:
SUZUKI SANAE
Application Number:
JP578190A
Publication Date:
September 13, 1991
Filing Date:
January 12, 1990
Export Citation:
Assignee:
MINOLTA CAMERA KK
International Classes:
G02B19/00; G03B27/32; G03B27/54; (IPC1-7): G02B19/00; G03B27/32; G03B27/54
Attorney, Agent or Firm:
Mitsuo Oyamada
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