Output efficiency control device, projection-type display apparatus, infrared sensor, and non-contact thermometer
US6072620A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1997 |
| Grant date | Jun 6, 2000 |
| Priority date | — |
| Expiry date | Jun 25, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/0056
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Microlenses 3a and 3b are formed on a first surface of a transparent substrate, and an output efficiency control device 2 which modulates a light amount of incident light is provided on a second surface opposing the first surface. Incident light 4 is made to be incident obliquely to an optical axis of the microlens 3a, to be focused on the output efficiency control device 2. The output efficiency control device 2 modulates a light amount of incident light and outputs the light as outgoing light 5 through the microlens 3b. Because of such a structure, the output efficiency control device 2 can be decreased in size, compared with a diameter of a beam and an aperture of a microlens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.