| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an objective lens holder that is high in stiffness, and adaptable for high-speed recording and reproduction, an objective lens drive device, and an optical-disk recording and reproduction device thereof. <P>SOLUTION: An objective lens holder 1 has a light incident port 3a and a light emission port 3b; a cavity portion 3 that guides incident light 12 into an objective lens 2, and accommodates the objective lens 2 at the side of the light emission port 3b; and an aperture 4 having an opening 4a for limiting the diameter of beam passing through the cavity portion 3 to the effective diameter 6 of the objective lens. In a cavity portion of the aperture 4, inner wall surfaces 5 are formed, in which a space between the inner wall surfaces facing each other is gradually increased with proceeding from the opening 4a to the light incident port 3a or the light emission port 3b. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
