Pivotable mirror device for tracking

Claim 2

A pivotable mirror device for tracking and for driving a light beam spot in the radial direction of an optical disk comprising an information recording medium, said device comprising: a mirror holding member for holding a reflecting mirror; a thin leaf spring pivotably supporting said mirror holding member, wherein a planar portion of said thin leaf spring is laid on a rear surface of the reflecting surface of the reflecting mirror, wherein said thin leaf spring is constricted between said planar portion and a portion at which said thin leaf spring is attached to a thin leaf spring supporting member to thereby form a torsional portion for pivotal movement thereof; a high attenuation member attached to said torsional portion; and wherein said torsional portion is divided into a portion which is twisted during said pivotal movement and a portion which is not twisted during said pivotal movement, and wherein said high attenuation member is provided so as to couple said divided portions together.

Claim 3

A pivotable mirror device for tracking and for driving a light beam spot in the radial direction of an optical disk comprising an information recording medium, said device comprising: a mirror holding member for holding a reflecting mirror; a thin leaf spring pivotably supporting said mirror holding member, wherein a planar portion of said thin leaf spring is laid on a rear surface of the reflecting surface of the reflecting mirror, wherein said thin leaf spring is constricted between said planar portion and a portion at which said thin leaf spring is attached to a thin leaf spring supporting member to thereby form a torsional portion for pivotal movement thereof; a high attenuation member attached to said torsional portion; and wherein said high attenuation member comprises a viscoelastic member and a restraining plate lined with said viscoelastic member.

Claim 4

A pivotable mirror device for tracking and for driving a light beam spot in the radial direction of an optical disk comprising an information recording medium, said device comprising: a mirror holding member for holding a reflecting mirror; a thin leaf spring pivotably supporting said mirror holding member, wherein a planar portion of said thin leaf spring is laid on a rear surface of the reflecting surface of the reflecting mirror, wherein said thin leaf spring is constricted between said planar portion and a portion at which said thin leaf spring is attached to a thin leaf spring supporting member to thereby form a torsional portion for pivotal movement thereof; a high attenuation member attached to said torsional portion; and wherein said high attenuation member comprises a viscoelastic member and a restraining plate lined with said viscoelastic member.

Claim 5

A pivotable mirror device for tracking and for driving a light beam spot in the radial direction of an optical disk comprising an information recording medium, said device comprising: a mirror holding member for holding a reflecting mirror; a thin leaf spring pivotably supporting said mirror holding member, wherein a planar portion of said thin leaf spring is laid on a rear surface of the reflecting surface of the reflecting mirror, wherein said thin leaf spring is constricted between said planar portion and a portion at which said thin leaf spring is attached to a thin leaf spring supporting member to thereby form a torsional portion for pivotal movement thereof; and a high attenuation member attached to said torsional portion, wherein said torsional portion is provided with a portion having an opening to facilitate said pivotal movement, and wherein said high attenuation member is disposed on said portion having the opening.

Claim 6

A pivotable mirror device for tracking and for driving a light beam spot in the radial direction of an optical disk comprising an information recording medium, said device comprising: a mirror holding member for holding a reflecting mirror; a thin leaf spring pivotably supporting said mirror holding member, wherein a planar portion of said thin leaf spring is laid on a rear surface of the reflecting surface of the reflecting mirror, wherein said thin leaf spring is constricted between said planar portion and a portion at which said thin leaf spring is attached to a thin leaf spring supporting member to thereby form a torsional portion for pivotal movement thereof; and a high attenuation member attached to said torsional portion, wherein said torsional portion is provided with a portion having an opening to facilitate said pivotal movement, and wherein said high attenuation member is disposed on said portion having the opening.

Claim 7

An optical information recording-reproducing apparatus for effecting at least one of recording of information on and reproduction of information from a disk-like optical information recording medium having a plurality of tracks by use of a light beam spot, said apparatus including: a pivotable mirror device for moving the beam spot in a radial direction of the recording medium so as to effect a tracking operation of the beam spot to a given track; said pivotable mirror device comprising: a mirror holding member for holding a reflecting mirror; a thin leaf spring pivotably supporting said mirror holding member, wherein a planar portion of said thin leaf spring is laid on a rear surface of the reflecting surface of the reflecting mirror, wherein said thin leaf spring is constricted between said planar portion and a portion at which said thin leaf spring is attached to a thin leaf spring supporting member to thereby form a torsional portion for pivotal movement thereof; and a high attenuation member attached to said torsional portion, wherein said high attenuation member comprises a viscoelastic member and a restraining plate lined with said viscoelastic member.

Claim 8

An optical information recording-reproducing apparatus for effecting at least one of recording of information on and reproduction of information from a disk-like optical information recording medium having a plurality of tracks by use of a light beam spot, said apparatus including: a pivotable mirror device for moving the beam spot in a radial direction of the recording medium so as to effect a tracking operation of the beam spot to a given track; said pivotable mirror device comprising: a mirror holding member for holding a reflecting mirror; a thin leaf spring pivotably supporting said mirror holding member, wherein a planar portion of said thin leaf spring is laid on a rear surface of the reflecting surface of the reflecting mirror, wherein said thin leaf spring is constricted between said planar portion and a portion at which said thin leaf spring is attached to a thin leaf spring supporting member to thereby form a torsional portion for pivotal movement thereof; and a high attenuation member attached to said torsional portion, wherein said high attenuation member comprises a viscoelastic member and a restraining plate lined with said viscoelastic member.

Claim 9

An optical information recording-reproducing apparatus for effecting at least one of recording of information on and reproduction of information from a disk-like optical information recording medium having a plurality of tracks by use of a light beam spot, said apparatus including: a pivotable mirror device for moving the beam spot in a radial direction of the recording medium so as to effect a tracking operation of said beam spot to a given track; said pivotable mirror device comprising: a mirror holding member for holding a reflecting mirror; a thin leaf spring pivotably supporting said mirror holding member, wherein a planar portion of said thin leaf spring is laid on a rear surface of the reflecting surface of the reflecting mirror, wherein said thin leaf spring is constricted between said planar portion and a portion at which said thin leaf spring is attached to a thin leaf spring supporting member to thereby form a torsional portion for pivotal movement thereof; and a high attenuation member attached to said torsional portion, wherein said torsional portion is provided with a portion having an opening to facilitate said pivotal movement, and wherein said high attenuation member is disposed on said portion having the opening.

Claim 10

An optical information recording-reproducing apparatus for effecting at least one of recording of information on and reproduction of information from a disk-like optical information recording medium having a plurality of tracks by use of a light beam spot, said apparatus including: a pivotable mirror device for moving the beam spot in a radial direction of the recording medium so as to effect a tracking operation of said beam spot to a given track; said pivotable mirror device comprising: a mirror holding member for holding a reflecting mirror; a thin leaf spring pivotably supporting said mirror holding member, wherein a planar portion of said thin leaf spring is laid on a rear surface of the reflecting surface of the reflecting mirror, wherein said thin leaf spring is constricted between said planar portion and a portion at which said thin leaf spring is attached to a thin leaf spring supporting member to thereby form a torsional portion for pivotal movement thereof; and a high attenuation member attached to said torsional portion, wherein said torsional portion is provided with a portion having an opening to facilitate said pivotal movement, and wherein said high attenuation member is disposed on said portion having the opening.

Claim 11

A pivotable mirror device for deflecting a light beam toward a desired direction, comprising: a mirror holding member for holding a reflecting mirror; a thin leaf spring pivotably supporting said mirror holding member, wherein a planar portion of said thin leaf spring is laid on a rear surfacer of the reflecting surface of the reflecting mirror, wherein said thin leaf spring is constricted between said planar portion and a portion at which said thin leaf spring is attached to a thin leaf spring supporting member to thereby form a torsional portion for pivotal movement thereof; and a high attenuation member attached to said torsional portion, wherein said torsional portion is divided into a portion which is twisted during said pivotal movement and a portion which is not twisted during said pivotal movement, and wherein said high attenuation member is provided so as to couple said divided portions together.

Claim 12

A pivotable mirror device for deflecting a light beam toward a desired direction, comprising: a mirror holding member for holding a reflecting mirror; a thin leaf spring pivotably supporting said mirror holding member, wherein a planar portion of said thin leaf spring is laid on a rear surfacer of the reflecting surface of the reflecting mirror, wherein said thin leaf spring is constricted between said planar portion and a portion at which said thin leaf spring is attached to a thin leaf spring supporting member to thereby form a torsional portion for pivotal movement thereof; and a high attenuation member attached to said torsional portion, wherein said torsional portion is divided into a portion which is twisted during said pivotal movement and a portion which is not twisted during said pivotal movement, and wherein said high attenuation member is provided so as to couple said divided portions together.

Claim 13

A pivotable mirror device for deflecting a light beam toward a desired direction, comprising: a mirror holding member for holding a reflecting mirror; a thin leaf spring pivotably supporting said mirror holding member, wherein a planar portion of said thin leaf spring is laid on a rear surface of the reflecting surface of the reflecting mirror, wherein said thin leaf spring is constricted between said planar portion and a portion at which said thin leaf spring is attached to a thin leaf spring supporting member to thereby form a torsional portion for pivotal movement thereof; and a high attenuation member attached to said torsional portion, wherein said high attenuation member comprises a viscoelastic member and a restraining plate lined with said viscoelastic member.

Claim 14

A pivotable mirror device for deflecting a light beam toward a desired direction, comprising: a mirror holding member for holding a reflecting mirror; a thin leaf spring pivotably supporting said mirror holding member, wherein a planar portion of said thin leaf spring is laid on a rear surface of the reflecting surface of the reflecting mirror, wherein said thin leaf spring is constricted between said planar portion and a portion at which said thin leaf spring is attached to a thin leaf spring supporting member to thereby form a torsional portion for pivotal movement thereof; and a high attenuation member attached to said torsional portion, wherein said high attenuation member comprises a viscoelastic member and a restraining plate lined with said viscoelastic member.

Claim 15

A pivotable mirror device for deflecting a light beam toward a desired direction comprising: a mirror holding member for holding a reflecting mirror; a thin leaf spring pivotably supporting said mirror holding member, wherein a planar portion of said thin leaf spring is laid on a rear surface of the reflecting surface of the reflecting mirror, wherein said thin leaf spring is constricted between said planar portion and a portion at which said thin leaf spring is attached to a thin leaf spring supporting member to thereby form a torsional portion for pivotal movement thereof; and a high attenuation member attached to said torsional portion, wherein said torsional portion is provided with a portion having an opening to facilitate said pivotal movement, and wherein said high attenuation member is disposed on said portion having the opening.

Claim 16

A pivotable mirror device for deflecting a light beam toward a desired direction comprising: a mirror holding member for holding a reflecting mirror; a thin leaf spring pivotably supporting said mirror holding member, wherein a planar portion of said thin leaf spring is laid on a rear surface of the reflecting surface of the reflecting mirror, wherein said thin leaf spring is constricted between said planar portion and a portion at which said thin leaf spring is attached to a thin leaf spring supporting member to thereby form a torsional portion for pivotal movement thereof; and a high attenuation member attached to said torsional portion, wherein said torsional portion is provided with a portion having an opening to facilitate said pivotal movement, and wherein said high attenuation member is disposed on said portion having the opening.