Optical apparatus for controlling angle of divergence of ring beam
US5764828A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 1996 |
| Grant date | Jun 9, 1998 |
| Priority date | — |
| Expiry date | Oct 18, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/09
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical apparatus for controlling an angle of divergence of a ring beam which is capable of irradiating a ringed light beam having a uniform distribution of light intensity with an arbitrary angle of divergence with respect to the optical axis in the direction of 360.degree. concurrently. The optical apparatus comprises parallel beam generating means (2) to which a light beam (L1) output from a light source (1) is input and which outputs the incident light (L2) by transforming it into a parallel light beam (L3); ring beam generating means (3) to which the parallel beam (L3) output from the parallel beam generating means (2) is input and which outputs the input light (L4) by transforming it into a ringed light beam (L5) whose shape is annular when irradiated to an imaginary plane perpendicular to an optical axis (A--A); and divergent angle changing means (4) for changing an angle of divergence (.theta.3) (an angle formed between the optical axis (A--A) and the direction of propagation of the ring beam (L5)).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.