| US 7,576,931 B2 | ||
| Driving unit for optical pick-up including lens | ||
| Toru Ishimasa, Tokyo (Japan); and Satoko Uchikawa, Tokyo (Japan) | ||
| Assigned to Nidec Copal Corporation, Tokyo (Japan) | ||
| Filed on Sep. 17, 2007, as Appl. No. 11/898,876. | ||
| Claims priority of application No. 2006-251984 (JP), filed on Sep. 19, 2006. | ||
| Prior Publication US 2008/0088955 A1, Apr. 17, 2008 | ||
| Int. Cl. G02B 7/02 (2006.01) | ||
| U.S. Cl. 359—822 [359/823] | 6 Claims |
| 1. A lens driving unit comprising:
a base;
a driving source fixed to the base;
a lead screw rotated and driven by the driving source;
a nut that is screwed to the lead screw and that has a projection protruding in a radial direction; and
a lens frame that is supported movably in a direction of an optical axis with respect to the base and that has a contact portion
coming into contact with the nut in the direction of the optical axis, wherein:
the nut is held so that only an end face thereof in the direction of the optical axis comes into contact with the lens frame;
the base has a guide groove that receives and guides the projection in the direction of the optical axis; and
the base or the lens frame has a projection-guiding part that directs and guides the projection of the nut screwed to the
lead screw toward the guide groove while coming into contact with the projection only during assembly and that maintains a
non-contact state with the projection after completion of the assembly.
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