Laser scanning system
AssigneeAsahi Kogaku Kogyo Kabushiki Kaisha
InventorsTaizo Saito, Nobuaki Nakano, Hiroto Watanabe, Toshihisa Ohno, Yoshiyuki Araki
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Abstract
A laser scanning system in which a laser beam is emitted by a laser source and repeatedly deflected by a deflector, such as a polygon mirror. A photo sensor is provided to detect the position of the deflected laser beam. The photo sensor and the laser source are mounted on a common support member so that the laser beam, deflected by the polygon mirror, directly enters the light receiving portion of the photo sensor. Optionally, a reflection mirror is provided such that the deflected laser beam is reflected by the reflection mirror and further deflected to the photo sensor by the polygon mirror.
Claims22
A laser scanning system for an electrophotographic image recording apparatus having a photoconductive material to be exposed to a laser beam, comprising:
- a laser source for emitting said laser beam;
- means for deflecting said laser beam emitted by said laser source to repeatedly scan a region that includes a predetermined angle zone;
- means for receiving said laser beam deflected by said deflecting means, said receiving means being separate from said laser source and being positioned in an area of said region outside of said predetermined angle zone;
- a first mounting member for mounting said deflecting means;
- and
- a second mounting member for mounting only said laser source and said light receiving means, said second mounting member being separate from said first mounting member, said laser source and said light receiving member being mounted to said second mounting member so as to have a predetermined positional relationship, wherein a horizontal synchronous signal is produced based upon said laser beam deflected by said deflecting means and received by said receiving means.
A laser scanning system for an electrophotographic image recording apparatus having a photoconductive material to be exposed to a laser beam, comprising:
- a laser source for emitting said laser beam;
- means for deflecting said laser beam emitted by said laser source so that said laser beam repeatedly scans a region that includes at least a predetermined angle zone;
- means for receiving said deflected laser beam outside said predetermined angle zone scanned by said deflected laser beam;
- means for reflecting said laser beam deflected by said deflected means to said receiving means;
- and
- a mounting member for mounting said laser source and said receiving means, wherein said reflection means is arranged so that an optical path length of said laser beam from said laser source to a surface of said photoconductive material to be exposed to said laser beam is substantially equal to an optical path length from said laser source to a light receiving member of said receiving means.
A laser scanning system for an electrophotographic image recording apparatus having a deflector that deflects a beam of light through an optical system to scan a surface of a photoconductive drum, said deflector and said optical system being mounted to a first mounting member, including:
- a light source for emitting said beam of light;
- means for receiving said deflected beam of light, said receiving means being separate from said light source;
- a second mounting member for mounting only said light source and said receiving means, said light source and said receiving means being mounted to said second mounting member so as to have a predetermined positional relationship, said second mounting member being separate from said first mounting member;
- and
- means for detecting a horizontal synchronous signal, generated by said receiving means in response to said beam of light deflected to said receiving means, that is used to synchronize a scanning of said beam of light with a modulation of said beam of light.
Dependencies are inferred from the claim text.