| 摘要 |
PROBLEM TO BE SOLVED: To obtain a lens for an optical pickup which has a temp. gradient smaller than a prescribed value by disposing an annular member made of a material having, a high thermal conductivity so as to bringing the same into contact with a plastic lens and supporting the plastic lens with a holding arm. SOLUTION: This optical pickup has the annular member 12 arranged to come into contact with the plastic lens 11. The upper holding arm 13 is disposed on the lower side of the plastic lens 11 and is arranged between the plastic lens 11 and the annular part 13A at the front end of the upper holding arm 13 supporting the same. The annular member 12 is formed to a shape of a washer and consists of the material having the high thermal conductivity. The material of the high thermal conductivity used for the annular member 12 is preferably a beryllium copper alloy and may be metals, such as copper and bronze. The annular member 12 comes into contact with the plastic lens 11 and functions to make the temp. of the plastic lens 11 uniform. |
