Sound motion picture projector

Patent 4208108 Issued on June 17, 1980. Estimated Expiration Date:

December 8, 1997. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

2633055

2962927

3012105

3452161

3682363

3778558

Film speed control for sound motion picture projector
Patent #: 3989361
Issued on: 11/02/1976
Inventor: Gross

Inter-record gap recording or playback apparatus Patent #: 4097906
Issued on: 06/27/1978
Inventor: Schild , et al.

Inventors

Assignee

Canon Kabushiki Kaisha

Application

No. 05/858799 filed on 12/08/1977

US Classes:

352/27, Flexible strip type360/13, RECORD EDITING360/3Motion picture film

Examiners

Primary: Hix, L. T.
Assistant: Perkey, William B.

Attorney, Agent or Firm

Toren, Mcgeady and Stanger

International Classes

G03B 31/00 (20060101)
G03B 31/02 (20060101)

Foreign Application Priority Data

1976-12-13 JP

Abstract

In the disclosed motion picture projector the original sound recorded on the main magnetic stripe along one edge of a film stripe also having a magnetic balance stripe along the other edge of the same film surface, is reproduced by a recording-reproducing head. A second recording-reproducing head records the signal on the balance stripe. While the original sound signal is being heard, the first recording-reproducing head overlaps a second sound signal on the main stripe. A part of the original sound signal on the main stripe may be erased and a new signal recorded in its place.