Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1979-03-16
1981-01-27
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
354 25, G01J 120
Patent
active
042477611
ABSTRACT:
The invention relates to an arrangement for automatically focusing the image of an object, obtained by an objective lens system onto an image plane, wherein a setting device is provided which is controlled by photo-electric sensors and which determines the optimum distances of the objective lens system from the image plane. In accordance with the invention, a CTD image sensor is disposed in the image plane, the read-out signals of which are obtained for a sequence of objective settings, integrated and compared with one another. The time or point of occurrence of the greatest integrated signal is determined and coded into a signal which indicates the interval of time from the beginning of the setting sequence with such signal being supplied to the setting device. An arrangement in accordance with the invention is particularly suitable for use in photographic camera range measuring devices and speed measuring devices.
REFERENCES:
Popular Photography, 1976, No. 1, p. 94.
Sequin et al., "Charge Transfer Devices" Academic Press, New York, 1975, pp. 1-18.
IBM Technical Disclosure Bulletin, vol. 16, No. 1, Jun. 1973, pp. 173-174.
Hostetter Darwin R.
Nelms David C.
Siemens Aktiengesellschaft
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