Compact, light-weight optical imaging system and method of makin

Details Compact, light-weight optical imaging system and method of makin Compact, light-weight optical imaging system and method of makin

1999-04-26

2000-04-04

Spyrou, Cassandra

Optical: systems and elements

Prism

359832, 359833, 359834, G02B 504

Patent

active

06046867&

ABSTRACT:
A compact optical imaging system that transmits light received from an object located at an image plane to an exit pupil to form an image comprises a first prism, a second prism, a converging reflective element, and a converging transmissive element. The first prism includes a first face, a second face, and a third face that faces the image plane. The included angle between the first face and the second face of the first prism is .alpha.. The second prism includes a first face facing the exit pupil and substantially parallel to the first face of the first prism, and a second face adjacent the second face of the first prism. The converging reflective element is adjacent the first face of the first prism. The converging transmissive element is on or adjacent the first face of the second prism. The included angle .alpha. between the first face and the second face of the first prism lies in a range in which light originating at the exit pupil passes through the converging transmissive element, the second prism and the first prism, is reflected by the converging reflective element back into the first prism, is reflected at the second face of the first prism, is totally internally reflected at the first face of the first prism, and passes through the third face of the first prism to the image plane.

REFERENCES:
patent: 5212375 (1993-05-01), Goto et al.
patent: 5446710 (1995-08-01), Gardner et al.
patent: 5450237 (1995-09-01), Yoshida et al.

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