The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 31, 1977
Filed:
Oct. 16, 1975
Susumu Iguchi, Tokyo, JA;
Masamichi Furukawa, Tokyo, JA;
Ricoh Co., Ltd., Tokyo, JA;
Abstract
Voltage comparators for actuating a camera shutter and a low-light indicating lamp respectively have inputs connected to junctions between photocells and resistors so as to be controlled in response to the light level. The voltage comparator for the low-light indicator energizes the indicator when the light level is below a low-light value from the time the shutter release button is partially depressed until the time the shutter is closed after the exposure. The voltage comparator for the shutter produces a shutter opening signal to open the shutter for the required length of time based on the light level. The output of the voltage comparator for the shutter is connected through a diode to the input of the voltage comparator for the low-light indicator so that the low light indicator is deenergized when the shutter is closed.