Title:
OPTICAL SCANNING DEVICE
Document Type and Number:
Japanese Patent JPH02205815
Kind Code:
A
Abstract:
PURPOSE:To prevent flare light or external light from being converged on a body to be irradiated by providing an optical path bending hologram mirror which has a hologram film. CONSTITUTION:The parallel luminous flux 2 from a light source unit 1 which collimates and emits the diverged luminous flux from a laser oscillator forms linear luminous flux 5 on the reflecting surface of a rotary polygon mirror 4 as a deflector after passing through a cylindrical lens 3 which has power only in a subscanning direction. This luminous flux 5 is converged only in the subscanning direction and still parallel in a main scanning direction. The linear luminous flux 5 is deflected and scanned as the rotary polygon mirror 4 rotates and scanned optically from luminous flux 6a to luminous flux 6b according to the deflection angle. The luminous flux is therefore scanned on a hologram mirror 7 and diffracted light beams 8a'-8b' of 0th order by the hologram mirror 7 are reflected to the rotary polygon mirror 4, so that diffracted light beams 8a-8b of 1st order are scanned linearly on the irradiated body 9. Consequently, the flare light and external light other than scan wavelength light are removed.
Inventors:
KOIDE JUN
Application Number:
JP2528389A
Publication Date:
August 15, 1990
Filing Date:
February 03, 1989
Export Citation:
Assignee:
CANON KK
International Classes:
G02B26/12; B41J2/44; G02B26/10; G03G15/04; (IPC1-7): G02B26/10; G03G15/04
Attorney, Agent or Firm:
Kato Kazuo
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