Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1988-07-13
1989-09-26
Perkey, W. B.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
250201, G03B 300, G01J 120
Patent
active
048704423
ABSTRACT:
An auxiliary light source for a passive focus detector, such as would be used for automatic focusing. A projection lens is inclined with respect to the imaging lens and projects a patterned image from a surface inclined with respect to the projection lens. Preferably the patterned image is projected to lie along the axis of the imaging lens so that a sharp illumination pattern is formed at all distances along that axis. Preferably the pattern is such that a higher intensity portion is imaged at a far distance and a lower intensity portion is imaged at a near distance.
REFERENCES:
patent: 4690538 (1987-09-01), Matsui et al.
Sugawara Saburo
Tejima Yasuyuki
Yuda Hideaki
Asahi Kogaku Kogyo Kabushiki Kaisha
Perkey W. B.
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