Image projector, projected image pattern, laser driver,...

Details Image projector, projected image pattern, laser driver,... Image projector, projected image pattern, laser driver,...

2005-05-10

2005-05-10

Perkey, W. B. (Department: 2851)

Photography

With exposure objective focusing means, focusing aid, or...

Having auxiliary illumination

C396S431000, C348S370000

Reexamination Certificate

active

06892027

ABSTRACT:
Image projection apparatus wherein, a focusing lens is controlled when a shutter is operated so that a contrast signal, obtained when a luminance signal from a camera signal processing circuit is supplied to an auto focusing detection circuit, may become maximum. A laser diode is driven to generate laser beams that are condensed into parallel laser beams by a condenser. These parallel laser beams are applied to a hologram plate and thereby diffracted. The diffracted laser beams interfere with each other, to produce a hologram image with sufficient contrast. Therefore, satisfactory focusing can be made in an auto focus mode of the contrast detection system or in a manual focus mode.

REFERENCES:
patent: 5485235 (1996-01-01), Meyers
patent: 5569904 (1996-10-01), Meyers
patent: 5701015 (1997-12-01), Lungershausen et al.
patent: 0 693 700 (1996-01-01), None
patent: 61-48883 (1986-03-01), None
patent: 8-54559 (1996-02-01), None
patent: 10-254337 (1998-09-01), None
patent: 11-353422 (1999-12-01), None

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