发明名称 |
OPTICAL HEAD HAVING A PRISM |
摘要 |
An optical head wherein a required astigmatism can be obtained readily to facilitate production thereof and the linear distance between a face of an information record medium and a light receiving element is reduced to reduce the overall size and weight of the optical head. The optical head comprises a prism having a parallelogram shape in side elevation. The prism has a reflecting/transmitting face extending at an angle of about 45 degrees with respect to an optical axis to the information record face for reflecting light from a light source toward the information record face, first and second reflecting faces extending perpendicularly to the optical axis for successively reflecting light transmitted thereto through the transmitting face, and a transmission face extending in parallel to the reflecting/transmitting face. Light emerging from the transmitting face of the prism is received and converted into an electrical signal by a light receiving element.
|
申请公布号 |
US5124970(A) |
申请公布日期 |
1992.06.23 |
申请号 |
US19900465869 |
申请日期 |
1990.01.16 |
申请人 |
PIONEER ELECTRONIC CORPORATION |
发明人 |
SATO, KATSUHARU;YANAGAWA, NAOHARU |
分类号 |
G11B7/135 |
主分类号 |
G11B7/135 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|