Electromagnetically operated shutter

Details Electromagnetically operated shutter Electromagnetically operated shutter

1980-10-10

1982-03-16

Griffin, Donald A.

354274, G03B 962, G03B 908

Patent

active

043198228

ABSTRACT:
An electromagnetically operated shutter device includes a magnetic body and permanent magnets which form a magnetic circuit in the magnetic body. A positioning member for seating the magnets within the body is made of a non-metallic material, and is formed of a support structure and a frame. A gap is formed by the frame between the positioning member and the magnetic body, and a shutter drive motor is disposed in the gap and is rotatably held by the support structure. According to one embodiment, an adjusting member is arranged on the body for adjusting the extent to which shutter blades driven by the rotor overlap one another. The adjusting member is magnetically shielded by a magnetic path which is formed by a part of the magnetic body.

REFERENCES:
patent: 3533345 (1970-10-01), Starp
patent: 3635141 (1972-01-01), Starp et al.
patent: 3654845 (1972-04-01), Fahlenberg et al.

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