Auxiliary light projection apparatus for auto focus detection

Details Auxiliary light projection apparatus for auto focus detection Auxiliary light projection apparatus for auto focus detection

2006-03-14

2006-03-14

Nguyen, Thong (Department: 2872)

Optical: systems and elements

Diffraction

From grating

C359S741000, C359S619000, C396S150000

Reexamination Certificate

active

07012750

ABSTRACT:
An auxiliary light projection apparatus used for focus detection has a laser beam generating device and a diffraction plate for diffracting a laser light from said laser beam generating device. The diffraction plate has micro lenses regularly arranged in vertical and horizontal directions. The curvature of each micro lens in the vertical direction is different from that in the horizontal direction. The pitch of arrangement of the micro lenses in the vertical direction is different from that in the horizontal direction. In addition, the height of the micro lenses is varied cyclically. The auxiliary light projection apparatus projects a diffraction light pattern of the laser light emergent from the diffraction plate to an object to be photographed, as a pattern used for focus detection.

REFERENCES:
patent: 4629324 (1986-12-01), Stern
patent: 6033094 (2000-03-01), Sohn

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