Dust-proof structure for optical pickup unit
US5790511A · kind A · utility
14Cited by
7References
9Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Aug 23, 1996 |
| Grant date | Aug 4, 1998 |
| Priority date | — |
| Expiry date | Aug 23, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/121
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical pickup unit is formed such that a portion on an upstream side of the air flow has a streamline shape or similar shape to the streamline shape so as to keep the air flow generated with high speed rotations of a disc-shaped recording medium away from a vicinity of an objective lens. According to this arrangement, dust contained in the air flow can be prevented from adhering to the surface of the objective lens. Moreover, the dust will not enter inside the optical pickup unit through a small clearance between a lens holder of the objective lens and a cover for the optical pickup unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.