Light-emitting device for automatic focus adjustment apparatus

Details Light-emitting device for automatic focus adjustment apparatus Light-emitting device for automatic focus adjustment apparatus

1986-06-03

1988-07-19

DeMeo, Palmer C.

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

313512, 313111, 313117, H01L 3300

Patent

active

047587644

ABSTRACT:
In an automatic focus adjustment apparatus with a light-emitting device comprising a condenser lens and a light-emitting element which radiates light onto an object and adjusts the focal point according to a light reflected back from the object, undesired flare is eliminated by placing a diaphragm sufficiently close to the light-emitting element so that only the effective light from the element passes to the condenser lens by using a cap, an opaque paint or a spatial filter, and/or by applying a low reflectance paint to the inner wall of an outer casing of the light-emitting device.

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