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:
Sep. 03, 1991
Filed:
Jan. 16, 1990
Masahiko Kanda, Osaka, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A light absorption detector has one or two light emitting members and a light receiving element spaced a predetermined distance apart from each other on a film substrate (1). Light is transmitted from one side to the other side of a subject. a change in the absorption magnitude of this transmitted light by the subject is then detected to provide respective information. A photodiode (PD) is located near the light emitting member or near two light emitting diodes (LED1, LED2). The photodiode detects a change in the quantity of light emitted. A CPU (16) corrects a change in the quantity of light with a change in the temperature of the light emitting element for controlling the current flowing to the light emitting member or light emitting diodes. Futher, a thermistor (37) and a heater (39) are located in the vicinity of at least one of a light emitting diode (34) and a photodiode (31). A CPU (43) controls a current flowing through the heater in response to a detection of an output of the thermistor so that the temperature of at least of the light emitting member or of the light receiving element is maintained constant.