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:
Mar. 30, 2004
Filed:
Oct. 25, 2000
Applicant:
Inventors:
Shinya Kubo, Tokyo, JP;
Tetsuichiro Yamamoto, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01J 1/32 ;
U.S. Cl.
CPC ...
G01J 1/32 ;
Abstract
The scanner includes the switch that is closed when a document is read, the boosted-voltage conversion circuit that boosts a DC voltage of 12 volts (V) supplied from a power source (not shown) and then converts it into a high-frequency signal b of 50 KHz, the temperature detection circuit formed of the thermistor for ambient temperature detection and correction circuit , and the dimmer control circuit that varies the high-frequency signal b from the boosted-voltage conversion circuit according to a temperature detected by the thermistor and produces a drive signal c to vary the luminance of the cold-cathode-tube light source