Imaging optical system
First Claim
Patent Images
1. An imaging optical system for transmitting a primary image to form an enlarged or reduced secondary image without forming an intermediate image in the middle of optical paths, comprising:
- a projection optical system; and
a reflection optical system having a positive power and disposed in such a way that its optical axis forms an angle other than a right angle with respect to a enlargement-side image surface,wherein all principal rays between said reflection optical system and said enlargement-side image surface form a uniform angle with respect to the enlargement-side image surface and a base ray incident on a reflection surface of said reflection optical system forms an angle of 90°
or less with respect to a base ray reflected by the reflection optical system.
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Abstract
An imaging optical system transmits a primary image. The optical system does not form an intermediate image. The primary image is projected on a screen as a secondary image. The optical system has a projection optical system and a reflection optical system. An optical axis of the reflection optical system forms an angle other than 90° with respect to a screen-side image surface.
164 Citations
6 Claims
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1. An imaging optical system for transmitting a primary image to form an enlarged or reduced secondary image without forming an intermediate image in the middle of optical paths, comprising:
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a projection optical system; and a reflection optical system having a positive power and disposed in such a way that its optical axis forms an angle other than a right angle with respect to a enlargement-side image surface, wherein all principal rays between said reflection optical system and said enlargement-side image surface form a uniform angle with respect to the enlargement-side image surface and a base ray incident on a reflection surface of said reflection optical system forms an angle of 90°
or less with respect to a base ray reflected by the reflection optical system. - View Dependent Claims (2, 3, 4)
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5. An image projection device, comprising:
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an image providing means for providing a primary image; a screen on which a secondary image is projected; a projection optical system; and a reflection optical system having a positive power and disposed in such a way that its optical axis forms an angle other than a right angle with respect to the screen, wherein all principal rays between said reflection optical system and said screen form a uniform angle with respect to the screen and a base ray incident on a reflection surface of said reflection optical system forms an angle of 90°
or less with respect to a base ray reflected by the reflection optical system.
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6. An image reading apparatus, comprising:
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an image providing surface for providing a primary image; an image projection surface for projecting a secondary image on; a reflection optical system having a positive power and disposed in such a way that its optical axis forms an angle other than a right angle with respect to the image providing surface; and a projection optical system, wherein all principal rays between said reflection optical system and said image providing surface form a uniform angle with respect to the image providing surface and a base ray incident on a reflection surface of said reflection optical system forms an angle of 90°
or less with respect to a base ray reflected by the reflection optical system.
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Specification