Arrangement for turning image projected on image screen

Details Arrangement for turning image projected on image screen Arrangement for turning image projected on image screen

1990-11-16

1992-04-21

Henry, Jon W.

Optical: systems and elements

Prism

With reflecting surface

359726, 359737, 359738, 359888, 353 81, G02B 718, G02B 504, G02B 522

Patent

active

051073730

ABSTRACT:
An arrangement for turning an image projected on an image screen has an image screen, a trapezoidal prism for image turning, and an optical system for image producing. The prism has an entry surface, a base surface and an exit surface. The entry surface of the prism encloses with the base surface an angle which is different from an angle enclosed by the exit surface of the base surface. A light beam extending on an optical axis of the optical system for image producing is offset on the exit surface relative to the optical axis and encloses an angle with the optical axis which is not equal to zero, and a transmission filter is located between the prism and the image screen.

REFERENCES:
patent: 4529276 (1985-07-01), Yamada

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