Scanning optical apparatus and image forming apparatus using...

Details Scanning optical apparatus and image forming apparatus using... Scanning optical apparatus and image forming apparatus using...

2007-03-20

2007-03-20

Phan, James (Department: 2872)

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

C359S196100, C359S217200, C359S204200, C347S232000, C347S233000, C347S243000, C347S259000

Reexamination Certificate

active

11518241

ABSTRACT:
A scanning optical apparatus having stable optical performance even if the characteristic of a vertical cavity surface emitting laser is fluctuated due to increase in drive current, and an image forming apparatus using the same are provided. The scanning optical apparatus comprises a converting optical system for converting a beam from the light source means having plural emission points into a beam of another state, deflecting means, and an imaging optical system for directing the deflected beam onto a scanning surface, and either pair of conditions is satisfied,3≦Fnos<Fnom≦15 and dθs/dT<dθm/dT, or3≦Fnom<Fnos≦15 and dθm/dT<dθs/dT,where Fnom and Fnos represent F numbers of the light source means side of the converting optical system in main and sub-scanning directions, θm and θs half value angles of far field pattern in the main and sub-scanning directions, and dθm/dT and dθs/dT the fluctuations of θm and θs due to temperature change.

REFERENCES:
patent: 5299045 (1994-03-01), Sekiguchi
patent: 2002-40350 (2002-02-01), None
patent: 2003-156704 (2003-05-01), None
patent: 2005-11997 (2005-01-01), None

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