Controlling position of a rotatable transducer in devices employ

Details Controlling position of a rotatable transducer in devices employ Controlling position of a rotatable transducer in devices employ

1990-10-19

1992-03-17

Arnold, Bruce Y.

Optical: systems and elements

Lens

With support

359814, 359823, G02B 702

Patent

active

050973614

ABSTRACT:
An optical disk recorder, or other apparatus, use a rotary actuator for supporting a work tool, such as an objective lens which is pivotable or rotatable without a pivot pin. Rotation causing or tracking coils on the rotary actuator are disposed adjacent to permanent magnets to selectively effect rotation of the rotary actuator about the pivot pin. A bias electrical current is supplied to these coils to generate magnetic fields which are in opposite rotational senses; such fields force the rotary actuator against the pin in such a manner that the point of contact between the rotary actuator and the pin follows the rotation of the actuator about the pin.

REFERENCES:
patent: 4643522 (1987-02-01), Takashima
patent: 4861138 (1989-08-01), Suzuki
patent: 4998802 (1991-03-01), Kasuga et al.
patent: 5046819 (1991-10-01), Childer

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