Title:
SCANNING OPTICAL SYSTEM
Document Type and Number:
Japanese Patent JPH04130410
Kind Code:
A
Abstract:
PURPOSE:To accomplish accurate position detection by returning reflected light from a reflection mirror disposed in a position detection means to a semiconductor laser light beam source. CONSTITUTION:Incident light 11 on the reflection mirror 12a out of laser light beam which scans a photosensitive body 1 is vertically reflected, advances in a reverse direction through a path which it traces hitherto, and is returned to a semiconductor laser 9. Since the laser 9 and the reflection mirror 12a are located at optically conjugate positions, special accuracy other than the accuracy of an angle around an axis vertical to the scanning plane of the reflection mirror is not needed. In the case that the light which is emitted by the laser 9 itself is returned to the laser 9 in the middle of exciting and emitting light, the interference phenomenon of the light is caused in the laser 9 and the fluctuation of optical output occurs. When the optical output is to be kept constant, the change of a driving current occurs. By grasping this change, it is detected when the light of its own is returned. Thus, the accurate position detection is accomplished.
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Inventors:
ABE HIDEAKI
Application Number:
JP25261290A
Publication Date:
May 01, 1992
Filing Date:
September 21, 1990
Export Citation:
Assignee:
NEC CORP
International Classes:
G02B26/10; (IPC1-7): G02B26/10
Domestic Patent References:
| JPH0290121A | 1990-03-29 |
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)