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US 8,570,620 B2Granted
Light scanning unit and electrophotographic image forming apparatus using the same
AssigneeSamsung Electronics Co., Ltd.
InventorJong-Wuk Ku
Life of this patent
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Abstract
A light scanning unit and an electrophotographic image forming apparatus using the same. The light scanning unit uses a reduced number of optical components by forming an optical unit disposed between a light source and an optical deflector by using only a single lens and ensures optical and mechanical properties by having an appropriate main/sub scanning magnification ratio.
Claims18
A light scanning unit comprising:
- a light source to emit a light beam;
- an optical deflector to deflect and scan the light beam emitted from the light source in a main scanning direction;
- a first optical unit comprising a single lens to collimate the light beam emitted from the light source in the main scanning direction and focus the light beam onto a reflection surface of the optical deflector in a sub scanning direction, the first optical unit being disposed between the light source and the optical deflector;
- and
- a second optical unit comprising at least one lens to image the light beam deflected and scanned by the optical deflector onto a scanning target surface,
- wherein the following expression is satisfied
-
- β
-
-
- m
-
- >
-
- β
-
-
- s
-
-
-
- and
-
-
- 0.05
-
- (
- β
-
-
- s
- β
-
-
- m
- )
- 2
- <
- 0.5
- in order to reduce a tolerance sensitivity in the sub scanning direction,
- where, βm represents a magnification of an optical system of the light scanning unit in the main scanning direction, and βs represents a magnification of the optical system of the light scanning unit in the sub scanning direction.
38 more elements
An electrophotographic image forming apparatus comprising:
- a photoreceptor;
- a light scanning unit to scan a light beam onto a scanning target surface of the photoreceptor so as to form an electrostatic latent image;
- and
- a developing unit to provide a toner to the electrostatic latent image formed by the photoreceptor so as to develop the electrostatic latent image, wherein the light scanning unit comprises a light source to emit the light beam;
- an optical deflector to deflect and scan the light beam emitted from the light source in a main scanning direction;
- a first optical unit comprising a single lens to collimate the light beam emitted from the light source in the main scanning direction and focus the light beam onto a reflection surface of the optical deflector in a sub scanning direction, the first optical unit being disposed between the light source and the optical deflector, and;
- a second optical unit comprising at least one lens to image the light beam deflected and scanned by the optical deflector onto the scanning target surface;
- and wherein the following expressions are satisfied
-
- β
-
-
- m
-
- >
-
- β
-
-
- s
-
-
-
- and
-
-
- 0.05
-
- (
- β
-
-
- s
- β
-
-
- m
- )
- 2
- <
- 0.5
- in order to reduce a tolerance sensitivity in the sub scanning direction,
- where, βm represents a magnification of an optical system of the light scanning unit in the main scanning direction, and βs represents a magnification of the optical system of the light scanning unit in the sub scanning direction.
40 more elements
Dependencies are inferred from the claim text.