Image-forming optical system and apparatus using the same

Details Image-forming optical system and apparatus using the same Image-forming optical system and apparatus using the same

1999-05-18

2000-07-04

Epps, Georgia

Optical: systems and elements

Single channel simultaneously to or from plural channels

By surface composed of lenticular elements

359630, 359631, G02B 2710, G02B 2714

Patent

active

060847158

ABSTRACT:
A compact, thin and low-cost image-forming optical system having an optical low-pass filter, and an apparatus using the image-forming optical system. The image-forming optical system for forming an image of an object includes a stop (2), a first prism (10) placed closer to the object side than the stop (2), and a second prism (20) placed closer to the image side than the stop (2). The first prism (10) has object-side reflecting surfaces (12, 13) with an aspherical surface configuration that reflect a light beam in the prism and give a power to the light beam when reflecting it. The second prism (20) has image-side reflecting surfaces (22, 23) with an aspherical surface configuration that reflect a light beam in the prism and give a power to the light beam when reflecting it. A low-pass filter (4) for cutting off a high-frequency component is provided between the object-side reflecting surfaces (12, 13) and the image-side reflecting surfaces (22, 23).

REFERENCES:
patent: 6021004 (2000-02-01), Sekita

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