US 5,345,432 AGranted

Optical head

AssigneeKabushiki Kaisha Toshiba

InventorsAkihiro Kasahara, Hideo Yamasaki, Takashi Yoshizawa, Sou Ishika

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Abstract

An optical head comprises a laser beam source, a photo-detector device for receiving a laser beam emitted from the laser beam source and reflected at a data recording medium, an optical system for sending the laser beam from the data recording medium to the photo-detector device, and a base member for fixing the photo-detector device and the optical system. The photo-detector device has a photo-detector element, a mount member on which the photo-detector element is mounted, a block for fixing one end of the mount member, a spring member for applying elastic force to the mount member, a screw member for moving the photo-detector element along one direction against elastic force of the spring member and fixing the element to an arbitrary position, and a hinge portion formed in the fixing end of the mount member.

Claims4

Dependent claims

An optical head for reproducing recorded data in an optical recording medium by directing light to the medium and detecting light reflected by the medium, said optical head comprising:

emitting means for emitting light;
detecting means for detecting light reflected by said medium;
optical means for directing emitted light from said emitting means to said medium, and for directing light reflected by said medium to said detecting means;
a base member for integrally fixing said emitting means and said optical means;
a mount member for mounting said detecting means, said mount member having a hinge portion in a first end portion thereof and a supporting section for said detecting means provided in a second end portion thereof;
a fixing member supported by said base member for fixing said first end portion of said mount member to swing said second end portion of said mount member including said supporting section about said hinge portion, said fixing member having a hole for passing reflected light along a path between said medium and said detecting means;
a cylindrical packing member comprising a cylindrical elastic member, said cylindrical packing member having first and second end portion shaving diameters and a central portion having a diameter smaller than the diameters of the first and second end portions, the first end portion being pressed against the fixing member and the second end portion being pressed against the mount member to surround a portion of the path, which portion extends between the fixing member and the mount member and thereby extends from said hole to said detecting means;
urging means for urging said second end portion of said mount member along a direction affecting a position of the detecting means in the path;
and
adjusting means for adjusting the position of said detecting means in the path by moving said second end portion of said mount member against an urging force applied by said urging means in a direction to compass the cylindrical packing member.

7 more elements

An optical head for reproducing recorded data in an optical recording medium by directing light to the medium and detecting light reflected by the medium, said optical head comprising:

emitting means for emitting light;
detecting means for detecting light reflected by said medium;
optical means for directing emitted light from said emitting means to said medium, and for directing light reflected by said medium to said detecting means;
a base member for integrally fixing said emitting means and said optical means;
a mount member for mounting said detecting means, said mount member having a hinge portion in a first end portion thereof and a supporting section for said detecting means provided in a second end portion thereof;
a fixing member supported by said base member for fixing said first end portion of said mount member to swing said second end portion of said mount member including said supporting section about said hinge portion, said fixing member having a hole for passing reflected light along a path between said medium and said detecting means;
a cylindrical packing member comprising a cylindrical elastic member, said cylindrical packing member having first and second end portion shaving diameters and a central portion having a diameter smaller than the diameters of the first and second end portions, the first end portion being pressed against the fixing member and the second end portion being pressed against the detecting means;
urging means for urging said second end portion of said mount member along a direction affecting a position of the detecting means in the path;
and
adjusting means for adjusting the position of said detecting means in the path by moving said second end portion of said mount member against an urging force applied by said urging means in a direction to compass the cylindrical packing member.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/125,143Filed 23 Sep 1993 · continuation
Priority: JP 2-29386131 Oct 1990
Granted: 6 Sep 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

G11B 7/08
Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the…:…
G11B 7/123
Heads, e.g. forming of the optical beam spot or modulation of the optical beam: integrated head arrangements, e.g. with source and detectors…
G11B
Information storage based on relative movement between record carrier and transducer

Family

Serial785,265Parent of this continuation · filed 30 Oct 1991
US 5,345,432 AThis patent

From the US filing history. Foreign family members aren’t listed.

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