Monitor mechanism for use with a scanning optical apparatus with composite drawing a monitoring beams
US5043566A · kind A · utility
6Cited by
1References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1989 |
| Grant date | Aug 27, 1991 |
| Priority date | — |
| Expiry date | Dec 1, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04744
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A monitor mechanism for use with a scanning optical apparatus in which the direction of polarization is utilized to separate a source laser light beam into a pattern drawing and a monitor beamlet and to synthesize them again into a single after passing through a scanning lens and beam deflector. The two beamlets can thus be controlled so as to project towards the deflector and scanning lens in the same direction, which is effective in reducing the offset between the pattern drawing and monitor beams that may occur on account of such factors as variations in lens performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.