Patent · US Expired

Film projector with sound playback or recording

US4200363A · kind A · utility

1Cited by
6References
19Claims
0Family size

Inventor

Key dates

Filing dateDec 11, 1978
Grant dateApr 29, 1980
Priority date—
Expiry dateDec 11, 1998

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG03B41/08
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

A motion picture film projector includes a sound head for playing back or for recording a sound track on the film. Absolute synchronism between the picture and sound is assured by the use of a single motor and common shaft to move the film past the sound head and to rotate the optical rectification system. In one embodiment, the sound head is mounted on the concave side of a stationary arcuate film guide opposite the sound track, and the film is driven past the sound head by a sprocket wheel mounted on the common shaft adjacent the optical rectification system.

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