| 摘要 |
<p>PROBLEM TO BE SOLVED: To protect an objective and a signal recording medium by providing protection members on both sides across the objective of a lens holder and making the protection members collide if the lens holder collides against the signal recording medium even when the lens holder is displaced slantingly. SOLUTION: The protection members 27 and 28 are installed on both the sides across the objective 2 of the lens holder 1 and even if the lens holder 1 is displaced slantingly, the protection member 27 or 28 is made to collide when the lens holder 1 collides against the signal recording medium. In this case, the protection members 27 and 28 are installed on the lens holder 1 by being positioned by positioning members 24a and 25a provided for the lens holder 1 to determine the installation positions of the protection members 27 and 28 on the lens holder 1.</p> |
