Optical pickup and optical disc apparatus provided with the same

An optical pickup comprising:

• an optical system focusing a light beam emitted from a laser light source on an information recording surface of a disc-like recording medium via optical devices such as a prism, an objective lens and the like and making a light beam reflected on said information recording surface entering into an optical detector via said optical devices, in a state of being equipped in an optical disc apparatus;
• a lens holder holding said objective lens and attaching a coil to which a coil winding is applied thereto;
• a unit base supporting said lens holder via a suspension in such a manner as to freely move in a thickness direction and a radial direction of said disc-like recording medium;
• a magnet generating a magnetic field passing through said coil;
• a yoke mounting said magnet;
• and
• a casing attaching said magnet, said yoke, said optical system and said unit base thereto,
• wherein opposing surfaces of said coil, said magnet and said yoke are respectively arranged at substantially symmetrical positions with respect to an optical axis of said objective lens in a state in which said coil is not energized, and said yoke and said unit base are connected via a spring member so as to mount said unit base to said casing.

An optical pickup comprising:

• an optical system focusing a light beam emitted from a laser light source on an information recording surface of a disc-like recording medium via optical devices such as a prism, an objective lens and the like and making a light beam reflected on said information recording surface entering into an optical detector via said optical devices, in a state of being equipped in an optical disc apparatus;
• a lens holder holding said objective lens and attaching a coil to which a coil winding is applied thereto;
• a unit base supporting said lens holder via a suspension in such a manner as to freely move in a thickness direction and a radial direction of said disc-like recording medium;
• a magnet generating a magnetic field passing through said coil;
• a yoke mounting said magnet;
• and
• a casing attaching said magnet, said yoke, said optical system and said unit base thereto,
• wherein a contact member mounted to said unit base or said casing is structured such as to be in contact with said yoke.

An optical pickup comprising:

• an optical system focusing a light beam emitted from a laser light source on an information recording surface of a disc-like recording medium via optical devices such as a prism, an objective lens and the like and making a light beam reflected on said information recording surface entering into an optical detector via said optical devices, in a state of being equipped in an optical disc apparatus;
• a lens holder holding said objective lens and attaching a coil to which a coil winding is applied thereto;
• a unit base supporting said lens holder via a suspension in such a manner as to freely move in a thickness direction and a radial direction of said disc-like recording medium;
• a magnet generating a magnetic field passing through said coil;
• a yoke mounting said magnet;
• and
• a casing attaching said magnet, said yoke, said optical system and said unit base thereto,
• wherein opposing surfaces of said coil, said magnet and said yoke are respectively arranged at substantially symmetrical positions with respect to an optical axis of said objective lens in a state in which said coil is not energized, said yoke and said unit base are connected via a spring member so as to mount said unit base to said casing, and a contact member mounted to said casing is made in contact with said yoke.

An optical disc apparatus comprising:

• an optical pickup comprising:
• an optical system using a disc-like recording medium, focusing a light beam emitted from a laser light source on an information recording surface of the disc-like recording medium via optical devices such as a prism, an objective lens and the like and making a light beam reflected on said information recording surface entering into an optical detector via said optical devices;
• a lens holder holding said objective lens and attaching a coil to which a coil winding is applied thereto;
• a unit base supporting said lens holder via a suspension in such a manner as to freely move in a thickness direction and a radial direction of said disc-like recording medium;
• a magnet generating a magnetic field passing through said coil;
• a yoke mounting said magnet;
• and
• a casing attaching said magnet, said yoke, said optical system and said unit base thereto,
• wherein the optical disc apparatus comprises:
• an optical pickup;
• an optical pickup feeding mechanism moving said pickup in a radial direction of said disc-like recording medium;
• a disc motor for attaching said disc-like recording medium thereto and rotating said disc-like medium;
• a chassis mounting said optical pickup, said optical pickup feeding mechanism and said disc motor;
• and
• an electric circuit having a signal processing system and a control system.

An optical disc apparatus comprising:

• an optical pickup comprising:
• an optical system using a disc-like recording medium, focusing a light beam emitted from a laser light source on an information recording surface of the disc-like recording medium via optical devices such as a prism, an objective lens and the like and making a light beam reflected on said information recording surface entering into an optical detector via said optical devices;
• a lens holder holding said objective lens and attaching a coil to which a coil winding is applied thereto;
• a unit base supporting said lens holder via a suspension in such a manner as to freely move in a thickness direction and a radial direction of said disc-like recording medium;
• a magnet generating a magnetic field passing through said coil;
• a yoke mounting said magnet;
• and
• a casing attaching said magnet, said yoke, said optical system and said unit base thereto,
• wherein the optical disc apparatus comprises:
• an optical pickup;
• an optical pickup feeding mechanism moving said pickup in a radial direction of said disc-like recording medium;
• a disc motor for attaching said disc-like recording medium thereto and rotating said disc-like medium;
• a chassis mounting said optical pickup, said optical pickup feeding mechanism and said disc motor;
• and
• an electric circuit having a signal processing system and a control system.

An optical disc apparatus comprising:

• an optical pickup comprising:
• an optical system using a disc-like recording medium, focusing a light beam emitted from a laser light source on an information recording surface of the disc-like recording medium via optical devices such as a prism, an objective lens and the like and making a light beam reflected on said information recording surface entering into an optical detector via said optical devices;
• a lens holder holding said objective lens and attaching a coil to which a coil winding is applied thereto;
• a unit base supporting said lens holder via a suspension in such a manner as to freely move in a thickness direction and a radial direction of said disc-like recording medium;
• a magnet generating a magnetic field passing through said coil;
• a yoke mounting said magnet;
• and
• a casing attaching said magnet, said yoke, said optical system and said unit base thereto,
• wherein the optical disc apparatus comprises:
• an optical pickup;
• an optical pickup feeding mechanism moving said pickup in a radial direction of said disc-like recording medium;
• a disc motor for attaching said disc-like recording medium thereto and rotating said disc-like medium;
• a chassis mounting said optical pickup, said optical pickup feeding mechanism and said disc motor;
• and
• an electrical circuit having a signal processing system and a control system.