Optical scanning unit

Details Optical scanning unit Optical scanning unit

1986-07-24

1988-05-31

Punter, William H.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 12, 318115, 318135, 350255, G02B 711, H02K 100, H02K 300

Patent

active

047476680

ABSTRACT:
An optical scanning unit with an objective for focussing a beam into a scanning spot on the surface of an information carrier and an electromagnetic drive for continuous correction of the position of the objective with respect to the information carrier. The objective is mounted in a movable ring-shaped magnetic body of a permanent-magnetic material which is arranged coaxially about the optical axis and which has magnetic poles at the axial ends. The drive is provided with sets of fixed coils which interact with the magnetic body via an air gap. Each set of coils has a first segmental coil arrangement having two active coil parts extending parallel in the peripheral direction of the magnetic body and located in the vicinity of the axial ends of the centrally positioned magnetic body. The unit is further equipped with at least one second coil arrangement which is positioned at least partially between the active coil parts of the above-mentioned first segmental arrangement.

REFERENCES:
patent: 4421997 (1983-12-01), Forys
patent: 4510421 (1985-04-01), Schwarzler
patent: 4602848 (1986-07-01), Honds et al.
patent: 4643522 (1987-02-01), Takashima

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