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:
Jul. 04, 1995
Filed:
Sep. 15, 1994
Hiromitsu Horie, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An inverter inverts the polarity of a laser diode driving signal LDS, and a delay circuit delays the laser diode driving signal LDS by the time required for the polarity inversion by the delay circuit. Conduction of first and second switching elements are differentially controlled in accordance with the inversion signal *LDS and a delay signal LDD. When the first switching element is on and the second switching element is off, a driving current Id is supplied to a laser diode so as to emit light. On the other hand, when the first switching element is off and the second switching element is on, a current is supplied to an impedance element, while the driving current Id becomes zero, and the light is extinct. Thus, it is possible to adjust the time for rise and the time for fall of the inversion signal *LDS to be respectively equal to the time for fall and the time for rise of the delay signal LDD, to prevent overshoot of the driving current Id and, hence, overshoot of a light emission power, and to adjust the light emission time of the laser diode to the preset time.