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:
Jun. 22, 1993
Filed:
Nov. 02, 1992
Juntaro Oku, Numazu, JP;
Tokyo Electric Co., Ltd., Tokyo, JP;
Abstract
A laser power control apparatus which comprises an exciting section for supplying a drive current to a laser oscillation device, a laser power controller for generating current designating data which is incremented and decremented in a binary order, first and second digital/analog converters respectively assigned to lower digits and higher digits of the current designating data, for performing digital-to-analog conversion on the lower-digit data and the higher-digit data, a current setting section for setting a level for the drive current in accordance with the sum of output voltages of the first and second digital/analog converters. In the apparatus, the current setting section has circuit constants which cause the ranges of the drive current for sequential two values of the higher-digit data to be overlapped with each other by a predetermined amount, and the laser power controller has a circuit for limiting the range of the lower-digit data to compensate the overlap of the drive current ranges.