Lens barrel for a video camera, and linear feeding system thereo

Details Lens barrel for a video camera, and linear feeding system thereo Lens barrel for a video camera, and linear feeding system thereo

1995-04-07

1997-02-11

Hindi, Nabil Z.

Optical: systems and elements

Lens

With variable magnification

359697, 359696, 359824, 32420721, G02B 1514, G02B 702, G01B 714, G01B 730

Patent

active

056026811

ABSTRACT:
A linear feeding system comprises a DC motor with brush, a lead screw integrally arranged as the rotational shaft of the DC motor, and a nut member screwed on the lead screw. This linear feeding system further comprises a magnet installed on the rotational shaft of the DC motor, which is provided with a plurality of N-pole and S-pole magnets being magnetized alternately in the circumferential direction, and a magnetoresistive effect sensor fixedly arranged to face this magnet. With this structure, it is possible to provide a simply structured, small linear feeding system capable of performing a high precision high-speed feeding operation at low costs.

REFERENCES:
patent: 4656377 (1987-04-01), Akiyama
patent: 4677377 (1987-06-01), Takahashi
patent: 4818939 (1989-04-01), Takahashi
patent: 4851771 (1989-07-01), Ikeda
patent: 4866382 (1989-09-01), Carmen
patent: 4914389 (1990-04-01), Jews
patent: 5041785 (1991-08-01), Bogaerts
patent: 5208535 (1993-05-01), Nakayama
patent: 5430375 (1995-07-01), Inoue

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