Optical head of disk drive
AssigneePENTAX Corporation
InventorSuguru Takishima
Life of this patent
Estimating the term…
Abstract
An optical head includes (1) a stationary optical unit fixed to a body of the optical disk drive, (2) a rotary arm rotatable along a surface of the optical disk, which carries an object lens which converges the light on the optical disk, and (3) a light-introducing system which directs the light from the light source module to the rotary arm so that the light proceeds in the rotary arm to reach the object lens.
Claims18
An optical head used in an optical disk drive in which an optical disk is rotatably supported, said optical head comprising:
- a stationary optical unit fixed to a stationary part of said optical disk drive, said stationary optical unit including a light source module which emits light;
- a rotary arm that is rotatable along said optical disk, said rotary arm carrying an object lens which converges said light on said optical disk;
- a light-introducing system which introduces said light from said light source module to said rotary arm so that said light travels along said rotary arm to reach said object lens, said light introducing system comprising a first reflection mirror mounted for rotation and provided to said stationary optical unit, which reflects said light from said light source module toward said rotary arm and a second reflection mirror provided to said rotary arm, which reflects said light from said first reflection mirror toward said object lens, wherein a light path between said first and second reflection mirrors is aligned with a rotation axis of said rotary arm.
An optical head used in an optical disk drive in which an optical disk is rotatably supported, said optical head comprising:
- an optical unit including a light source module which emits light;
- at least a pair of rotary arms rotatable along said optical disk, each of said rotary arms carrying an object lens which converges said light on said optical disk;
- and
- a switching system which selectively introduces said light from said light source module to one of said pair of rotary arms, so that said light travels along the selected rotary arm to reach said object lens of said selected rotary arm,
- wherein said optical unit is disposed between said pair of rotary arms in a direction of a rotation axis of said pair of rotary arms.
An optical head used in an optical disk drive in which an optical disk is rotatably supported, said optical head comprising:
- an optical unit including a light source module which emits light;
- at least a pair of rotary arms rotatable along said optical disk, each of said rotary arms carrying an object lens which converges said light on said optical disk;
- a switching system which selectively introduces said light from said light source module to one of said rotary arms, so that said light travels along the selected rotary arm to reach said object lens of said selected rotary arm, said switching system comprising a first reflection mirror provided to said optical unit, which reflects said light from said light source module toward one of said rotary arms and second reflection mirrors respectively provided to said rotary arms, each of which is able to reflect said light from said first reflection mirror to extend in a direction along a longitudinal direction of said rotary arm,
- wherein said first reflection mirror is rotatable about an axis located on a reflection surface of said first reflection mirror, and
- wherein an incident angle of light on said object lens is varied by a rotation of said first reflection mirror, so that a fine tracking operation is performed.
Dependencies are inferred from the claim text.