Optical: systems and elements – Lens – With support
Patent
1995-06-26
1997-06-10
Ben, Loha
Optical: systems and elements
Lens
With support
359813, 359821, G02B 702
Patent
active
056382227
ABSTRACT:
An optical element positioning device comprises a fixed member fixed to an optical apparatus having an optical axis, a movable member supported by the optical apparatus so as to be movable with respect to the fixed member, and holding a plurality of optical elements along the moving direction, a first permanent magnet arranged in the fixed member, and a plurality of second permanent magnets equal in number of the optical elements, disposed in the movable member along the moving direction and selectively able to face the first permanent magnet when the movable member is moved. The first magnet and each of the second magnets have a magnetic pole surfaces which face with each other, and lines of attracting magnetic force are generated between the magnets when the magnets are made face each other the first magnet and each of the second magnets have extending portions close to each other, and the lines of attracting magnetic force form a closed loop passing through the extending portion to give the movable member a force which stops the movable member, thereby positioning one of the optical elements on the optical axis.
REFERENCES:
patent: 4266855 (1981-05-01), Mohr
patent: 4790628 (1988-12-01), Nanno et al.
patent: 4863240 (1989-09-01), Nakajima et al.
patent: 4998802 (1991-03-01), Kasuga et al.
patent: 5289318 (1994-02-01), Sekine et al.
Ben Loha
Olympus Optical Co,. Ltd.
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