AUTOMATIC FOCUSING DEVICE

PURPOSE:To obtain the high quality of focusing from the shortest distance to infinity by switching focusing by active range-finding, focusing by passive range-finding after a focusing action by the active range-finding or focusing by direct passive range-finding in accordance with active range-findi...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	YAMADA MASATOSHI, TAKEHANA TAKAMICHI
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORIES THEREFOR APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHOTOGRAPHY PHYSICS
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain the high quality of focusing from the shortest distance to infinity by switching focusing by active range-finding, focusing by passive range-finding after a focusing action by the active range-finding or focusing by direct passive range-finding in accordance with active range-finding data. CONSTITUTION:A distance to an object 16 is measured by an active range- finding system 11 and the focusing action is executed by an active range-finding system 11 when the data is within a specified distance range. When it is out of the specified distance range, a difference between the active range-finding data and the present lens position data is obtained. When the obtained difference is smaller than the set deviation, the passive range-finding system 12 is allowed to execute the focusing action. When the difference is larger than the set deviation, the focusing action is executed by the passive range-finding system 12 after a focusing action based on the active range-finding data.