Hologram lens
US4355858A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1979 |
| Grant date | Oct 26, 1982 |
| Priority date | — |
| Expiry date | Sep 24, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S359/90
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A hologram lens capable of converting an output beam of light emitted from a semiconductor to a reconstruction light suitable for reconstructing holograms is prepared by use of the object light, which resembles a beam of light emitted divergently from a semiconductor laser for reconstructing holograms and which travels, in the opposite direction to the travelling direction of the beam of light from the semiconductor laser, in such a manner as to converge on a light emitting portion of the semiconductor laser, and the reference light which is an isotropic beam with a circular cross section. The object light is obtained by use of an optical system capable of converting an output beam emitted from semiconductor lasers to an isotropic beam of light with a circular cross section when the output beam of light is caused to pass through the optical system from its input side Lin to its output side Lout, and by causing an isotropic beam of light with a circular cross section to pass through the optical system from the output side Lout to the input side Lin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.