| 摘要 |
<P>PROBLEM TO BE SOLVED: To surely fix an objective lens with a small amount of adhesive. <P>SOLUTION: Four filling recesses 14 are formed in the inner peripheral surface of a fitting groove 5 formed concentrically with the light transmission hole of a holder 3 at every 90° in a peripheral direction, the bottom surface 14a of each filling recess 14 is inclined from one end surface 3a of the holder 3 to a lens receiving seat 6 to form the longitudinal shape of the recess 14 into a roughly triangular shape, inner surfaces 14b, 14c opposed to each other across the bottom surface 14a of each filling recess 14 are formed into circular-arc shapes to form the cross section of each filling recess 14 into a roughly U shape narrowed downward, and the planar surface of each filling recess 14 is formed into a roughly U shape narrowed in a deep side, so that the deep end circular-arc part 14d of each filling recess 14 is formed on a center line L extended from the center of a light transmission hole through the center of each filling recess 14. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
