Distance measuring infrared projection system

Details Distance measuring infrared projection system Distance measuring infrared projection system

1996-03-20

1998-07-14

Buczinski, Stephen C.

Optics: measuring and testing

Blood analysis

Hemoglobin concentration

396106, G01C 308, G03B 1300

Patent

active

057812810

ABSTRACT:
In a finder lens system having a zooming function, a distance measuring infrared projection system having its own zooming function is disposed such that the beam diameter of the emitted infrared ray becomes smaller in telephotographic mode. Accordingly, a sufficient quantity of light can be provided for measuring the distance and judging the projection area. The fifth lens (L5) constituting the infrared projection system has the first surface (facing the finder optical system) disposed at a position distanced from the third lens (L3) by 12.0 mm by way of a half mirror (M). An LED (1) is disposed at a position distanced from the second surface (facing the LED 1) of the fifth lens (L5) by about 13.8 mm.

REFERENCES:
patent: 4716284 (1987-12-01), Tanaka
patent: 4818865 (1989-04-01), Matsui et al.
patent: 4972216 (1990-11-01), Ueda et al.
Shashin Kogyo (Photo Industry) Special Issue, Kamera Renzu Hyakka (Camera Lens Encyclopedia), Apr. 20, 1983 in Japanese Language and English Translation.

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