Optical head having a light source adjusting mechanism and a method for adjusting a light source in an optical head
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorDaisuke Ogata
Life of this patent
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Abstract
An optical head of this invention includes: a light source emitting a plurality of beams from a plurality of emitting points; an optical system for focusing the plurality of beams on a recording medium; and an adjusting means for adjusting distances from the plurality of emitting points to the optical system, wherein the adjusting means includes a first member for supporting the light source and a second member for supporting the first member; the first member is rotatable around a central axis which is vertical to the plane including an optical axis of the optical system and the plurality of emitting points and passes through a point on the optical axis; and the second member is movable along a reference plane vertical to the optical axis.
Claims7
An optical head comprising:
- a light source emitting a plurality of beams from a plurality of emitting points;
- an optical system for focusing the plurality of beams on a recording medium;
- and
- an adjusting means for adjusting distances from the plurality of emitting points to the optical system,
- wherein the adjusting means comprises a first member for supporting the light source and a second member for supporting the first member;
- the first member is rotatable around a central axis which is vertical to a plane including an optical axis of the optical system and the plurality of emitting points and passes through a point on the optical axis;
- and the second member is movable along a reference plane vertical to the optical axis.
A method for adjusting distances from a plurality of emitting points to an optical system of an optical head comprising a light source emitting a plurality of beams from the plurality of emitting points;
- the optical system for focusing the plurality of beams on a recording medium;
- a first member which supports the light source and is rotatable around a central axis which is vertical to a plane including an optical axis of the optical system and the plurality of emitting points, and passes through a point on the optical axis;
- and a second member which supports the first member and is movable along a reference plane vertical to the optical axis,
- the method comprising the steps of:
- a) moving the second member along the reference plane so that positions of the plurality of emitting points are within an acceptable range of an aberration of the optical system;
- b) fixing the position of the second member relative to the optical system, after step a);
- c) rotating the first member around the central axis so that respective focal points of the plurality of beams are situated substantially on the same plane, after step b);
- and
- d) fixing the position of the first member relative to the second member, after step c).
Dependencies are inferred from the claim text.