Pickup actuator for disk-type media

Claim 2

Optical pickup apparatus comprising a magnetic circuit unit including at least one yoke plate (14,15); an actuator including at least one bobbin (31,32) loosely fitting around the yoke plate, a first coil (31A,32A) wound on the bobbin, second coil means (31X,31Y;32X,32Y) attached to a side surface of the first coil, and a suspension arm (44) for suspending the bobbin; and an optical pickup unit (30) connected to the bobbin.

Claim 3

Apparatus according to claim 1, wherein the suspension arm (44) is electrically conductive, and wherein the first coil (31A,32A) and the second coil means (31X,31Y; 32A,32Y) are energized via the suspension arm.

Claim 4

Apparatus according to claim 1 or claim 2, wherein the first coil (31A,32A) is arranged to control adjustment of the position of the optical pickup unit (30) in a tracking direction.

Claim 5

Apparatus according to claim 3, wherein the second coil means (31X,31Y; 32X,32Y) is arranged to control the positioning of the optical pickup unit in focusing and tilting directions of the optical pickup unit (30).

Claim 6

Apparatus according to any one of the preceding claims wherein the optical pickup unit (30) includes an objective lens (34), a tilt detection lens (35), and means for supporting the lenses and attached to the bobbin.

Claim 7

Apparatus according to any one of the preceding claims, further including at least one guide rail (41), a slider (43) supported on the guide rail for movement parallel to the guide rail, the suspension arm (44) having one end attached to the slider.

Claim 8

Apparatus according to claim 6, further including a second bobbin (36) connected to the slider (43), the second bobbin surrounding the yoke plate (14), and a carriage driving coil (36A) wound around the second bobbin.

Claim 9

Optical pickup apparatus, comprising a first pair of first and second yoke plates (13,14) having an air gap (17) therebetween; a second pair of first and second yoke plates (16,15) having a second air gap (18) therebetween; an air gap between the first and second pairs of yoke plates; each of the first yoke plates (13,16) including an elongate magnet (13A,16A) fixed thereto; guide means (41) extending in parallel with the first and second pairs of yoke plates; slider means (43) slidably received on the guide means; a pickup unit (30) including at least one lens unit (34,35); means for supporting the pickup unit including at least one suspension arm (44) connected at one end to the pickup unit (30) and at a second end to the slider (43); the pickup unit further including first and second bobbins (31,32) disposed surrounding the second yoke plates (14,15), respectively, first and second coils (31A,32A) wound about the first and second bobbins, for controlling positioning of the pickup unit (30) in a tracking direction, a portion of the first and second coils facing the elongate magnets; a pair of third coils (31X,31Y; 32X,32Y) supported by each of the first and second coils (31A,32A) and facing the elongate magnets (13A,16A), the third coils controlling positioning of the pickup unit (30) in focusing and tilt directions; a third bobbin (36) supported by the slider (43) and surrounding one of the second yoke plates (14), and a fourth coil (36A) wound on the third bobbin and having a portion facing one of the elongate magnets (13A).

Claim 10

Optical pickup apparatus, comprising a first pair of first and second yoke plates (13,14) having an air gap (17) therebetween; a second pair of first and second yoke plates (16,15) having a second air gap (18) therebetween; an air gap between the first and second pairs of yoke plates; each of the first yoke plates (13,16) including an elongate magnet (13A,16A) fixed thereto; guide means (41) extending in parallel with the first and second pairs of yoke plates; slider means (43) slidably received on the guide means; a pickup unit (30) including at least one lens unit (34,35); means for supporting the pickup unit including at least one suspension arm (44) connected at one end to the pickup unit (30) and at a second end to the slider (43); the pickup unit further including first and second bobbins (31,32) disposed surrounding the second yoke plates (14,15), respectively, first and second coils (31A,32A) wound about the first and second bobbins, for controlling positioning of the pickup unit (30) in a tracking direction, a portion of the first and second coils facing the elongate magnets; a pair of third coils (31X,31Y; 32X,32Y) supported by each of the first and second coils (31A,32A) and facing the elongate magnets (13A,16A), the third coils controlling positioning of the pickup unit (30) in focusing and tilt directions; a third bobbin (36) supported by the slider (43) and surrounding one of the second yoke plates (14), and a fourth coil (36A) wound on the third bobbin and having a portion facing one of the elongate magnets (13A).