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US 5,495,281 AGranted
Laser beam scanning apparatus having laser beam unit provided directly on printed circuit control board
AssigneeCanon Kabushiki Kaisha
InventorsYasumasa Nashida, Hiroshi Hashimoto, Masanori Ishizu, Toshihiko Inuyama, Junichi Kimizuka
Life of this patent
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Abstract
The present invention provides a laser beam scanning apparatus comprising a laser unit for emitting a laser beam, and a print circuit board having control means for controlling ON/OFF of the laser unit. The laser unit is provided directly on the print circuit board.
Claims42
An image forming apparatus, comprising:
- a photosensitive body;
- charging means for charging said photosensitive body;
- a laser unit for emitting a laser beam;
- deflection means for rotatively deflecting the laser beam emitted from said laser unit;
- a scan unit which includes said laser unit and said deflection means, said scan unit for emitting the deflected laser beam;
- developing means for developing a latent image on said photosensitive body;
- and
- a circuit board provided with control means for controlling said charging means, said laser unit, said deflection means and said developing means, said circuit board being fixed to said scan unit.
5 more elements
An image forming apparatus, comprising:
- a photosensitive body;
- a laser unit for emitting a laser beam;
- deflection means for rotatively deflecting the laser beam emitted from said laser unit;
- a scan unit which includes said laser unit and said deflection means, said scan unit for emitting the deflected laser beam;
- said photosensitive body, while in a charged condition, being exposed and scanned by the laser beam emitted from said scan unit to form a latent image, which latent image is developed and the developed image being transferred to a recording medium and fixed thereon;
- and
- a circuit board provided with control means for controlling said image forming apparatus, said circuit board being fixed to said scan unit;
- wherein said control means controls convey means for conveying the recording medium.
5 more elements
An image forming apparatus, comprising:
- a photosensitive body;
- a laser unit for emitting a laser beam;
- deflection means for rotatively deflecting the laser beam emitted from said laser unit;
- a scan unit which includes said laser unit and said deflection means, said scan unit for emitting the deflected laser beam;
- said photosensitive body, while in a charged condition, being exposed and scanned by the laser beam emitted from said scan unit to form a latent image, which latent image is developed, and the developed image being transferred to a recording medium and fixed thereon;
- and
- a circuit board provided with control means for controlling said image forming apparatus, said circuit board being fixed to said scan unit,
- wherein said control means controls transfer means for transferring the developed image of said photosensitive body.
5 more elements
An image forming apparatus, comprising:
- a photosensitive body;
- a laser unit for emitting a laser beam;
- deflection means for rotatively deflecting the laser beam emitted from said laser unit;
- a scan unit which includes said laser unit and said deflection means, said scan unit for emitting the deflected laser beam;
- said photosensitive body, while in a charged condition, being exposed and scanned by the laser beam emitted from said scan unit to form a latent image, which latent image is developed, and the developed image being transferred to a recording medium and fixed thereon;
- and
- a circuit board provided with control means for controlling said image forming apparatus, said circuit board being fixed to said scan unit,
- wherein said control means controls fixing means for fixing the image on the recording medium.
5 more elements
An image forming apparatus, comprising:
- a photosensitive body;
- charging means for charging said photosensitive means;
- a laser unit for emitting a laser beam;
- deflection means for rotatively deflecting the laser beam emitted from said laser unit;
- a scan unit which includes said laser unit and said deflection means, said scan unit for emitting the deflected laser beam;
- developing means for developing a latent image on said photosensitive body;
- and
- a circuit board provided with control means for controlling said charging means, said laser unit, said deflection means and said developing means, said laser unit being mounted on said circuit board.
5 more elements
A laser beam scanning apparatus, comprising:
- a laser unit for emitting a laser beam;
- deflection means for scanningly deflecting the laser beam emitted from said laser unit;
- a scan unit which includes said laser unit and said deflection means, said scan unit for emitting the deflected laser beam;
- and
- a circuit board provided with control means for controlling said laser unit and said deflection means, said circuit board having a first connecting portion for electrical connection to a connecting portion of said laser unit and a second connecting portion for electrical connection to a connecting portion of said deflection means,
- wherein a positional relation between the first and second connecting portions of said circuit board is the same as a positional relation between the connecting portion of said laser unit in said scan unit and the connecting portion of said deflection means in said scan unit.
3 more elements
An image forming apparatus, comprising:
- a photosensitive body;
- a laser unit for emitting a laser beam;
- deflection means for rotatively deflecting the laser beam emitted from said laser unit;
- a scan unit which includes said laser unit and said deflection means, said scan unit for emitting the deflected laser beam;
- said photosensitive body, while in a charged condition, being exposed and scanned by the laser beam emitted from said scan unit to form a latent image, which latent image is developed and the developed image being transferred to a recording medium and fixed thereon;
- and
- a circuit board provided with control means for controlling said image forming apparatus, said circuit board having, at positions corresponding to positions of said laser unit and said deflection means in said scan unit, connecting portions for electrical connection to said laser unit and said deflection means,
- wherein said circuit board has an Auto Power Control (APC) circuit for keeping light amount of the laser beam emitted from said laser unit constant.
5 more elements
An image forming apparatus, comprising:
- a photosensitive body;
- a laser unit for emitting a laser beam;
- deflection means for rotatively deflecting the laser beam emitted from said laser unit;
- a scan unit which includes said laser unit and said deflection means, said scan unit for emitting the deflected laser beam;
- said photosensitive body, while in a charged condition, being exposed and scanned by the laser beam emitted from said scan unit to form a latent image, which latent image is developed, and the developed image being transferred to a recording medium and fixed thereon;
- and
- a circuit board provided with control means for controlling said image forming apparatus, said circuit board having, at positions corresponding to positions of said laser unit and said deflection means in said scan unit, connecting portions for electrical connection to said laser unit and said deflection means,
- wherein said control means controls convey means for conveying the recording medium.
5 more elements
An image forming apparatus, comprising:
- a photosensitive body;
- a laser unit for emitting a laser beam;
- deflection means for rotatively deflecting the laser beam emitted from said laser unit;
- a scan unit which includes said laser unit and said deflection means, said scan unit for emitting the deflected laser beam;
- said photosensitive body, while in a charged condition, being exposed and scanned by the laser beam emitted from said scan unit to form a latent image, which latent image is developed, and the developed image being transferred to a recording medium and fixed thereon;
- and
- a circuit board provided with control means for controlling said image forming apparatus, said circuit board having, at positions corresponding to positions of said laser unit and said deflection means in said scan unit, connecting portions for electrical connection to said laser unit and said deflection means,
- wherein said control means controls transfer means for transferring the developed image on said photosensitive body.
5 more elements
An image forming apparatus, comprising:
- a photosensitive body;
- a laser unit for emitting a laser beam;
- deflection means for rotatively deflecting the laser beam emitted from said laser unit;
- a scan unit which includes said laser unit and said deflection means, said scan unit for emitting the deflected laser beam;
- said photosensitive body, while in a charged condition, being exposed and scanned by the laser beam emitted from said scan unit to form a latent image, which latent image is developed, and the developed image being transferred to a recording medium and fixed thereon;
- and
- a circuit board provided with control means for controlling said image forming apparatus, said circuit board having, at positions corresponding to positions of said laser unit and said deflection means in said scan unit connecting portions for electrical connection to said laser unit and said deflection means,
- wherein said control means controls fixing means for fixing the image on the recording medium.
5 more elements
A laser beam scanning apparatus, comprising:
- a laser unit for emitting a laser beam;
- deflection means for rotatively deflecting the laser beam emitted from said laser unit;
- a scan unit including said deflection means and emitting the laser beam deflected by said deflection means;
- and
- a circuit board on which said laser unit is mounted, said circuit board being fixed to said scan unit,
- wherein said circuit board is a flexible board, and the board is bent, whereby said laser unit is fixed to said scan unit.
3 more elements
A laser beam scanning apparatus, comprising:
- a laser unit for emitting a laser beam;
- deflection means for rotatively deflecting the laser beam emitted from said laser unit;
- detection means for detecting a position of the laser beam deflected by said deflection means;
- a scan unit including said deflection means and emitting the laser beam deflected by said deflection means;
- and
- a circuit board on which said detection means is mounted, said circuit board being fixed to said scan unit,
- wherein said circuit board is a flexible board, and the board is bent, whereby said detection means is fixed to said scan unit.
4 more elements
A laser beam scanning apparatus, comprising:
- a laser unit for emitting a laser beam;
- deflection means for rotatively deflecting the laser beam emitted from said laser unit;
- detection means for detecting a position of the laser beam deflected by said deflection means;
- a scan unit including said deflection means and emitting the laser beam deflected by said deflection means;
- and
- a circuit board on which said laser unit and said detection means are mounted, said circuit board being fixed to said scan unit.
3 more elements
A laser beam scanning apparatus, comprising:
- a laser unit for emitting a laser beam;
- deflection means for rotatively deflecting the laser beam emitted from said laser unit;
- and
- detection means for detecting a position of the laser beam deflected by said deflection means,
- wherein said laser unit and said detection means are mounted on the same circuit board.
2 more elements
Dependencies are inferred from the claim text.