Imaging lens for reading out image
US5768021A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 30, 1996 |
| Grant date | Jun 16, 1998 |
| Priority date | — |
| Expiry date | Dec 30, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/028
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The temperature coefficient of refractive index in each lens constituting an imaging lens is controlled such that the amount of change in the imaging position due to change in the imaging lens upon temperature alleviates the positional deviation between the imaging position and the light-receiving surface caused by members other than the imaging lens, thereby preventing the read-out accuracy from deteriorating. The amount of change in the imaging position caused by change in the refractive index of lenses upon change in temperature is adjusted so as to alleviate the positional deviation between the imaging position and light-receiving surface due to the thermal expansion of the member unitedly holding the light source, lenses, and receiving optics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.