Optical system supporting device
US5892628A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 8, 1997 |
| Grant date | Apr 6, 1999 |
| Priority date | — |
| Expiry date | Oct 8, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0932
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical system supporting device comprising: PA1 an objective lens, PA1 an objective lens holder holding the objective lens, PA1 a spring member having its one-side end secured to part of the objective lens holder, the spring member elastically supporting the objective lens holder, and PA1 a spring fixing member supporting the objective lens holder and the spring member, the other-side end of the spring member being secured to the spring fixing member, PA1 wherein the spring fixing member is composed of a synthetic resin exhibiting a ratio of coefficient of linear expansion along a flow direction to coefficient of linear expansion along a direction perpendicular to the flow direction of less than 1/2.5. A gate can be provided in a position such that in a plurality of spring fixing portions the synthetic resin has an orientation which is vertically and laterally symmetrical. Also, a gate can be provided in a position of the spring fixing member apart from the plurality of spring fixing portions with identical distances. This optical system supporting device can minimize the inclination of an objective lens attributed to a temperature change to thereby enable accurate recording of…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.