Image projection apparatus with a autofocusing system

Details Image projection apparatus with a autofocusing system Image projection apparatus with a autofocusing system

1994-03-02

1995-07-18

Cuchlinski, Jr., William A.

Optics: image projectors

Lens support

Lens position adjustable

348745, G03B 300

Patent

active

054346320

ABSTRACT:
An image projection device comprising at least one display panel (26, 27, 28), a projection lens system (C) and a focus-error detection system is described. The focus-error detection system comprises an auxiliary radiation source (50) delivering a focus measuring beam (b), an auxiliary lens (61) for capturing radiation (b.sub.r) diffusely reflected by a projection screen (D), and a detection unit (60) for measuring the size of a spot (S) formed on the screen by the beam (b).

REFERENCES:
patent: 3639048 (1972-02-01), Heaney et al.
patent: 3672757 (1972-06-01), Szymber et al.
patent: 3856392 (1974-12-01), Harrison
patent: 5046837 (1991-09-01), Strommer et al.
patent: 5098184 (1992-03-01), Van Den Brandt et al.
patent: 5235363 (1992-08-01), Vogeley et al.
patent: 5276523 (1994-01-01), Kurematsu et al.

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