Patent · US Expired

Optical sound head combined with a sound film projector

US5740294A · kind A · utility

4Cited by

6References

11Claims

0Family size

Assignee

Raytheon Anschutz GmbH · DE

Inventors

Hans Baumann · Jena, DE
Jurgen Perkams · Probsteierhagen, DE

Key dates

Filing date	May 28, 1996
Grant date	Apr 14, 1998
Priority date	—
Expiry date	May 28, 2016

Classification

Technology area (CPC G)Physics
CPC primaryG11B2007/13727
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

An optical sound head (L), comprising a red laser diode (11) and a inspection window (90), allowing easy functional inspection, but also simple adjustment during manufacture. The laser diode (11) and all optical (10) and electronic (20) assemblies to be adjusted to a specimen, are accommodated in a replaceable assembly (1), for easy and repeatable (A) replacement. A minimum signal-to-noise ratio for analogue sound scanning is achieved by an additional aperture (15), reducing the light intensity applied to the center of an aperture slot (8). Both apertures (8, 15) are preferably designed as unsupported, laser-cut metal sheets.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.