Projection lens unit

Details Projection lens unit Projection lens unit

1996-02-26

1996-12-24

Nelms, David C.

Optical: systems and elements

Lens

With field curvature shaping

359648, 359650, 359665, G02B 300

Patent

active

055878385

ABSTRACT:
A projection lens unit using the principles of liquid-cooled, optical coupling is disclosed. In particular, the present invention automatically re-focusses a lens unit that is being exposed to high temperature operating conditions. The temperature rise of the optical coupling liquid changes the refractive index of the liquid, thereby changing the focussing distance of the projection lens. As a result, the picture projected onto the screen becomes unfocussed. The present invention provides a countermeasure for automatically re-focussing the picture projected on the screen. An optical coupling lens, which is one of the lens element group of the projection lens, is movably coupled to an OC housing to move along the optical axis. The volume expansion caused by the temperature rise of the optical coupling liquid is converted to a pressure change. The pressure change is used for controlling the movement of the optical coupling lens. The focussing distance of the projection lens is automatically compensated for according to the temperature rise of the optical coupling liquid.

REFERENCES:
patent: 5157554 (1992-10-01), Kasihara

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