| 摘要 |
PURPOSE:To prevent dust from intruding into a fixed head part and to promote the reliability of data by shielding the fixed head part of a separate type optical head with an elastic member and a cover. CONSTITUTION:With regard to an opening part for incident and outgoing laser light provided on the side of the fixed head part 31, a gap between the side around the opening part of the head 31 and the side of PBS1-3 is shielded with the elastic member 11, and moreover an upper surface opening part of the head 31 is shielded by the fixed head cover 12. Consequently, dust is prevented from intruding into the head 31. |
