Exposure control device

Details Exposure control device Exposure control device

1989-04-04

1989-12-26

Gellner, Michael L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361147, G03B 936, H01H 4700

Patent

active

048901296

ABSTRACT:
An exposure control device is disclosed in which a member formed of a magnetic material is movable relative to a frame along a predetermined path to control the passage of light along an optical axis. Electromagnets are located on the frame at opposite ends of the path. In order to keep the mass of the movable member as small as possible, no magnetic elements are located on the member. Permanent magnets are located on opposite sides of the path and function with the electromagnets to move the member, keep the member suspended in a direction transverse to the direction of movement, and hold the member in one of two positions when the electromagnets are not energized.

REFERENCES:
patent: 3458769 (1969-07-01), Stampfli
patent: 3634735 (1972-01-01), Komatsu
patent: 3987473 (1976-10-01), Kondo
patent: 4011003 (1977-03-01), Dragt
patent: 4051499 (1977-09-01), Kondo
patent: 4313659 (1982-02-01), Saito et al.
patent: 4458227 (1984-07-01), Petersen
patent: 4497557 (1985-02-01), Petersen
patent: 4514065 (1985-04-01), Carrera

Affiliated with

Also associated with

Rating

Exposure control device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Exposure control device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Exposure control device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1579431