Molded lens
US7589914B2 · kind B2 · utility
1Cited by
2References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 19, 2007 |
| Grant date | Sep 15, 2009 |
| Priority date | — |
| Expiry date | Aug 23, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/1374
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A laser beam output from a semiconductor laser light source 1 is transmitted through a cover glass 2 in the optical axis Z direction, is incident on a molded lens 4 in a state of divergent rays, is converted into convergent rays by the molded lens 4, and is applied onto a recording face 5 of the optical recording medium. A diaphragm 3 is arranged. An area of each lens surface onto which a luminous flux of the laser beam restricted by the diaphragm 3 is applied corresponds to an effective area. The following expression (1) is satisfied:d1−d0≧0.04 mm (1)
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.