Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
LASER DEVICE
Document Type and Number:
Japanese Patent JP2006322917
Kind Code:
A
Abstract:

To provide a laser device capable of executing highly reliable and accurate distance measurement utilizing a self-coupling effect of a laser element regardless of the change of a wavelength changing rate characteristic of the laser element.

Feedback control of a driving condition of the laser element is performed so that a modulated laser light component is kept constant, based on information of the modulated laser light component generated by a self-coupling effect between a wavelength modulated laser light output from the laser element and reflected light from a reference point, set beforehand, of the laser light. For example, a driving current of the laser element is corrected based on a correction coefficient calculated theoretically, or feedback control of an amplitude of the driving current or its period increased and decreased periodically in order to perform wavelength modulation of the laser light is performed.


Inventors:
UENO TATSUYA
Application Number:
JP2006024456A
Publication Date:
November 30, 2006
Filing Date:
February 01, 2006
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
YAMATAKE CORP
International Classes:
G01B11/00; H01S5/062
Domestic Patent References:
JP2001330669A2001-11-30
JPH01233383A1989-09-19
JPH03135782A1991-06-10
JPH02239677A1990-09-21
JPH09329670A1997-12-22
Foreign References:
Other References:
JPN6011019665; 山田諄,紫藤進,津田紀生,上田正: '愛知工業大学研究報告. B, 専門関係論文集' 半導体レーザの自己結合効果を利用した小型距離計に関する研究 31, 199603, 35-42, 愛知工業大学
Attorney, Agent or Firm:
長門 侃二
山中 純一