Light head device

Application Number: 00106981
Application Date: 2000.04.24
Publication Number: 1271931
Publication Date: 2000.11.01
Priority Information: 1999/4/23 JP 115,886/99; 1999/10/5 JP 284,357/99
International: G11B7/12
Applicant(s) Name: Matsushita Electric Industrial Co., Ltd.
Inventor(s) Name: Asada Junichi;Nishikyo Omoteken;Takahashi Yuichi
Patent Agency Code: 31100
Patent Agent: xu tai
Abstract To implement light quantity monitoring with high frequency responsivity and correction of astigmatic differences of a semiconductor laser with a simple configuration with a fewer parts. Of the light beam output from a semiconductor laser light source 101, a peripheral beam component is entered by a light reflection element 107 into an anterior light monitoring photodetector 103 formed in the vicinity of a semiconductor laser light source. Furthermore, the surface of the reflection sphere of the light reflection element is formed an amorphic, providing high frequency responsivity. Furthermore, the light reflection element is placed inclined at a predetermined angle so as to cancel out astigmatic difference of the optical semiconductor laser light source. In addition, the photodetector is placed in the direction so that a reflected light is bent by an inclination of the light reflection element, reducing the amount of parallel displacement during adjustment of the light reflection element.