Title:
CONVERGENCE OPTICAL SYSTEM
Document Type and Number:
Japanese Patent JPS6478214
Kind Code:
A
Abstract:
PURPOSE:To simplify the constitution and to reduce the cost by converging luminous flux which is made incident on a reflection optical system between two reflecting mirrors by multipath reflection and then projecting it from the reflection optical system. CONSTITUTION:The luminous flux 1 is increased in luminous flux diameter by a beam expander, etc., and then made incident on the reflecting surface of a polygon mirror 51. The luminous flux reflected by the polygon mirror 51 is made incident on a plane mirror M1 first, reflected by its reflecting surface, and then directed to a concave mirror M2. Here, the luminous flux incident on the concave mirror M2 is reflected again by its reflecting surface and directed to a plane mirror M1. Then the luminous flux is converged gradually because of the positive refracting power that the concave reflecting surface of the plane mirror M2 has and the luminous flux becomes converged luminous flux when exiting from the convergence optical system consisting of the plane mirror M1 and concave mirror M2 and is directed to a surface R to be scanned. Consequently, the luminous flux can be converged by the simple optical system with high light utilization efficiency and this is usable as an optical system replacing the scanning lens of a scanning optical system.
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Inventors:
KONO MICHIO
Application Number:
JP23536987A
Publication Date:
March 23, 1989
Filing Date:
September 18, 1987
Export Citation:
Assignee:
CANON KK
International Classes:
G02B26/10; G02B17/00; (IPC1-7): G02B17/00; G02B26/10
Domestic Patent References:
| JP62132514B |
Attorney, Agent or Firm:
Marushima Giichi