Control frequency generator for a movie camera
AssigneeBraun GmbH
InventorJohann Roth
Life of this patent
Estimating the term…
Abstract
In a movie camera a control frequency generator for producing a picture and sound synchronizing sinusoidal control frequency using a rotating member of the camera such as a running gear made from a soft magnetic material and having a magnetically discontinuous region formed therein, a permanent magnet having one pole thereof placed in the vicinity of the discontinuous region, and a magnetic flux sensing device placed between the region and the pole of the permanent magnet for sensing the flux changes within the magnetic circuit during rotation of the camera gear and thereby producing the synchronizing control frequency.
Claims11
In a movie camera, a control frequency signal generator for producing a picture and sound synchronizing sinusoidal control frequency signal including a magnetically discontinued region in a rotating member of said camera, a permanent magnet having one pole thereof disposed in the vicinity of said region to define therewith a magnetic circuit, and a magnetic flux sensing means disposed between said region and said pole of said permanent magnet and operable for producing said control frequency signal from the flux changes within the magnetic circuit during rotation of said member.
Dependencies are inferred from the claim text.