Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1998-05-26
1999-08-17
Hannaher, Constantine
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
2502016, 396 96, 396128, G02B 704, G03B 1336
Patent
active
059397055
ABSTRACT:
The difference in brightness between the brightest area and the darkest area of the object of distance measurement can be speedily detected, as described above, and it can be determined before contrast calculation and correlation calculation are performed whether or not reliable distance measurement is possible. Therefore, where the object of distance measurement suffers from inadequate contrast, unnecessary performance of contrast calculation and comparative calculation regarding the distributions of accumulated charge can be avoided, so that the user can be promptly informed of the inadequacy in contrast and appropriate measures, such as emission of auxiliary light for distance measurement, can be speedily taken.
REFERENCES:
patent: 4300824 (1981-11-01), Tokuda et al.
patent: 4536072 (1985-08-01), Taniguchi et al.
patent: 4561750 (1985-12-01), Matsumura
patent: 4611910 (1986-09-01), Suzuki et al.
patent: 4618235 (1986-10-01), Ishida et al.
patent: 5721977 (1998-02-01), Yamawaki et al.
patent: 5808291 (1998-09-01), Nakamura
Hannaher Constantine
Minolta Co. , Ltd.
Pyo Kevin
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