Apparatus for aligning the optical system of a lamphouse and a movie projector
US5386257A · kind A · utility
Inventor
Key dates
| Filing date | Sep 27, 1993 |
| Grant date | Jan 31, 1995 |
| Priority date | — |
| Expiry date | Sep 27, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/2053
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Apparatus for aligning the optical systems of a lamphouse and a movie projector in the form of a laser alignment tool having a single beam laser with a diffraction grating to split the beam into multiple beams and the laser diode module is housed in a cylindrical casing. The diffraction grating splits the single laser into a specific number of beams of equal intensity, consisting of a center beam and each of the beams to either side of it at equal angles. The laser alignment tool has a geared motor with an adjustable speed which rotates the diffraction grating so that each angled beam sweeps a concentric circle with respect to the other beams. The diffraction grating is interchangeable so that the laser alignment tool can be used for lamphouse systems with varying focal lengths or for other applications such as reflector inspection. The motor may be turned on or off while the laser is kept on. The speed of rotation of the beams is controlled by varying the voltage to the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.