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US 5,182,668 AGranted
Optical beam scanning system having an image-forming system for reshaping a light beam to be applied to a scanning reflector
AssigneeDainippon Screen Mfg. Co., Ltd.
InventorMotonobu Kawabata
Life of this patent
Estimating the term…
Abstract
A first image-forming system includes first and second lens systems which are disposed from a light source to a deflector respectively. The first lens system has a positive power along a second direction so as to converge a diverging light beam from the light source onto the deflector with respect to the second direction. With respect to a first direction being perpendicular to the second direction, the first lens system has zero or a negative power while the second lens system has a positive power so that the focal point of the first image-forming system is located at the light source. Thus, a collimated light beam in the first direction from the first image-forming system is directed to the deflector.
Claims11
An optical beam scanning system, comprising:
- (a) a light source for emitting a diverging light beam;
- (b) a deflector for deflecting said light beam in a first direction;
- (c) a first image-forming system for converging said light beam from said light source onto said deflector with respect to a second direction, said second direction being perpendicular to said first direction,
- said first image-forming system consisting essentially of a first lens system disposed between said light source and said deflector, said first lens system having zero or a negative power along said first direction and having a positive power along said second direction, and a second lens system disposed between said first lens system and said deflector, said second lens system having a positive power only along said first direction;
- and
- (d) a second image forming system for focussing said light beam in said first and second directions on a surface to be scanned.
3 more elements
An optical beam scanning system, comprising:
- (a) a light source for emitting a diverging light beam;
- (b) a deflector for deflecting said light beam in a first direction;
- (c) a first image-forming system for converging said light beam from said light source onto said deflector with respect to a second direction, said second direction being perpendicular to said first direction,
- said first image-forming system including a first lens system disposed between said light source and said deflector, said first lens system having zero or a negative power along said first direction and having a positive power along said second direction, and a second lens system disposed between said first lens system and said deflector, said second lens system having a positive power only along said first direction;
- and
- (d) a second image forming system for focussing said light beam in said first and second directions on a surface to be scanned;
- wherein said second lens system is disposed away from said light source so that a focal point of said first image-forming system with respect to said first direction is disposed at said light source;
- and
- wherein said second lens system is formed by a plurality of lenses which are joined to each other.
6 more elements
An optical beam scanning system, comprising:
- (a) a light source for emitting a diverging light beam;
- (b) a deflector for deflecting said light beam in a first direction;
- (c) a first image-forming system for converging said light beam from said light source onto said deflector with respect to a second direction, said second direction being perpendicular to said first direction,
- said first image-forming system including a first lens system disposed between said light source and said deflector, said first lens system having zero or a negative power along said first direction and having a positive power along said second direction, and a second lens system disposed between said first lens system and said deflector, said second lens system having a positive power only along said first direction;
- and
- (d) a second image forming system for focussing said light beam in said first and second directions on a surface to be scanned;
- wherein said first lens system is formed by an aspherical lens;
- and
- wherein said first lens system is formed by a plurality of lenses which are joined to each other.
6 more elements
An optical beam scanning system, comprising:
- (a) a light source for emitting a diverging light beam;
- (b) a deflector for deflecting said light beam in a first direction;
- (c) a first image-forming system for converging said light beam from said light source onto said deflector with respect to a second direction, said second direction being perpendicular to said first direction,
- said first image-forming system including a first lens system disposed between said light source and said deflector, said first lens system having zero or a negative power along said first direction and having a positive power along said second direction, and a second lens system disposed between said first lens system and said deflector, said second lens system having a positive power only along said first direction;
- and
- (d) a second image forming system for focussing said light beam in said first and second directions on a surface to be scanned;
- wherein said first lens system is formed by a toroidal lens.
4 more elements
Dependencies are inferred from the claim text.