Camera having a magnetic flux shielding device

Details Camera having a magnetic flux shielding device Camera having a magnetic flux shielding device

1997-09-02

1999-01-05

Perkey, W. B.

Photography

With data recording

Magnetically on film or film cassette

G03B 1724

Patent

active

058571230

ABSTRACT:
A camera having a shielding device to prevent leaked magnetic flux generated by a drive motor from affecting magnetic information recorded on film in a camera in which a drive motor is provided within a winding spool. The shielding device includes an inner shielding member and an outer shielding member which shield magnetic flux from the drive motor, even if the intensity of the magnetic flux leaked from the motor fluctuates. The outer shielding member is made of permalloy B with a high maximum relative permeability, and is provided outside of a motor housing case for the drive motor. The motor housing case forms the inner shielding member, and is made of pure iron having a high saturated magnetic flux density. The leaked magnetic fluxes generated by the drive motor having a strong magnetic field intensity are shielded by the motor housing case while other leaked magnetic flux having a weak magnetic field intensity is shielded by the outer shielding member.

REFERENCES:
patent: 5701531 (1997-12-01), Tanaka et al.

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