Projection optical system and image display device

A technology for projecting optical systems and images, applied in the direction of optics, projection devices, optical components, etc.
CN104181695BActive Publication Date: 2017-01-18RICOH KK
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
RICOH KK
Publication Date
2017-01-18

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Abstract

The present invention relates to a projection optical system and an image display device, and an object of the present invention is to provide a compact projection optical system with a very short projection distance. In the projection optical system, the distance L between the intersection point of the mirror surface on the side of the magnification end of the lens closest to the magnification end and the optical axis to the intersection point of the reflector (102) and the optical axis is the minimum distance L, the focal length f of the refraction optical system (101) , When the optical axis direction is the Z axis and the arrangement direction of the plane mirror (102) and the curved mirror (103) is the Y axis, the maximum distance Ymax between the optical axis and the end of the image forming part (10) on the Y axis Satisfied on the YZ plane and among them, D1 is the maximum distance from the intersection point of the ray and the mirror on the magnifying end side of the lens closest to the magnifying end to the optical axis, ds1 is the concave amount of the mirror part covered by D1, θ1 is the connecting light The angle between the line of the point with the largest distance from the optical axis and the smallest point in the intersection with the curved mirror (103) and the optical axis.
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Description

technical field

[0001] The present invention relates to a projection optical system for an image display device and an image display device that enlarges and projects an image on a screen. Background technique

[0002] The image display device is also called a projector, and is used to project an image formed by an image forming unit on a screen, which is a projected surface. The projector includes a projection optical system that enlarges and projects the image formed by the image forming unit on the screen. The image forming section of the projector includes elements such as a Digital Micro-mirror Device (hereinafter abbreviated as DMD) or a liquid crystal panel. Among the projectors, there is a short-distance type projector, which can shorten the projection distance from the screen. In recent years, a projector that projects at an ultra-short distance can also enlarge the size of the image displayed on the screen, that is, an ultra-short-distance projector that can disp...

Claims

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