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US 7,065,008 B2Granted
Objective lens unit
AssigneeFunai Electric Co., Ltd.
InventorsRyotaro Nakagawa, Toyoshi Nogami
Life of this patent
Estimating the term…
Abstract
An objective lens has an actuator base and a lens holder for supporting an objective lens. The lens holder has a shaft hole. A shaft is disposed on the actuator base and fitted to the shaft hole. A cover is attached to the actuator base so as to cover the lens holder in a manner that the cover comes into contact with or comes close to the top face of the shaft. Protrusions are disposed on an actuator base opposing face and a cover opposing face of the lens holder without contacting the shaft. When the protrusions are contacted with the actuator base and the cover, a predetermined gap is formed between the lens holder and the actuator base and between the lens holder and the cover, the gap is communicated with a space in the cover through the side of the protrusions.
Claims10
An objective lens unit comprising:
- an actuator base;
- a lens holder for supporting an objective lens, the lens holder having a shaft hole penetrating therethrough, an actuator base opposing face and a cover opposing face;
- a shaft disposed on the actuator base and fitted to the shaft hole, the shaft having a top face;
- a cover attached to the actuator base so as to cover the lens holder in such a manner that the cover comes into contact with or comes close to the top face of the shaft;
- protrusions disposed on the actuator base opposing face and the cover opposing face of the lens holder in such a manner that the protrusions do not contact the shaft;
- an annular blade section formed on the actuator base opposing face and the cover opposing face of the lens holder in such a manner that the annular blade section surrounds the shaft hole, the annular blade section having substantially triangular section and a protruding length smaller than that of the protrusions;
- a focusing coil disposed on the lens holder;
- and
- a tracking coil disposed on the lens holder, wherein the lens holder is capable of sliding in a focusing direction along the shaft by an excitation of the focusing coil and also capable of oscillating around the shaft in a tracking direction by an excitation of the tracking coil, and
- when the protrusions contact the actuator base and the cover, a predetermined gap is formed between the lens holder and the actuator base and between the lens holder and the cover, the gap is communicated with a space in the cover through the side of the protrusions.
7 more elements
An objective lens unit comprising:
- an actuator base;
- a lens holder for supporting an objective lens, the lens holder having a shaft hole penetrating therethrough, an actuator base opposing face and a cover opposing face;
- a shaft disposed on the actuator base and fitted to the shaft hole, the shaft having a top face;
- a cover attached to the actuator base so as to cover the lens holder in such a manner that the cover comes into contact with or comes close to the top face of the shaft;
- protrusions disposed on the actuator base and the cover in such a manner that the protrusions do not contact the shaft, the protrusions protruding toward the lens holder;
- an annular blade section formed on the actuator base opposing face and the cover opposing face of the lens holder in such a manner that the annular blade section surrounds the shaft hole, the annular blade section having substantially triangular section and a protruding length smaller than that of the protrusions;
- a focusing coil disposed on the lens holder;
- and
- a tracking coil disposed on the lens holder, wherein the lens holder is capable of sliding in a focusing direction along the shaft by an excitation of the focusing coil and also capable of oscillating around the shaft in a tracking direction by an excitation of the tracking coil, and
- when the protrusions contact the lens holder, a predetermined gap is formed between the lens holder and the actuator base and between the lens holder and the cover, the gap is communicated with a space in the cover through the side of the protrusions.
7 more elements
An objective lens unit comprising:
- an actuator base;
- a lens holder for supporting an objective lens, the lens holder having a shaft hole penetrating therethrough, an actuator base opposing face and a cover opposing face;
- a shaft disposed on the actuator base and fitted to the shaft hole, the shaft having a top face;
- a cover attached to the actuator base so as to cover the lens holder in such a manner that the cover comes into contact with or comes close to the top face of the shaft;
- protrusions disposed on the actuator base opposing face in such a manner that the protrusions do not contact the shaft;
- an annular blade section formed on the actuator base opposing face and the cover opposing face of the lens holder in such a manner that the annular blade section surrounds the shaft hole, the annular blade section having substantially triangular section and a protruding length smaller than that of the protrusions:
- a focusing coil disposed on the lens holder;
- and
- a tracking coil disposed on the lens holder,
- wherein the lens holder is capable of sliding in a focusing direction along the shaft by an excitation of the focusing coil and also capable of oscillating around the shaft in a tracking direction by an excitation of the tracking coil, and
- when the protrusions contact the actuator base, a predetermined gap is formed between the lens holder and the actuator base, the gap is communicated with a space in the cover through the side of the protrusions.
8 more elements
An objective lens unit comprising:
- an actuator base;
- a lens holder for supporting an objective lens, the lens holder having a shaft hole penetrating therethrough, an actuator base opposing face and a cover opposing face;
- a shaft disposed on the actuator base and fitted to the shaft hole, the shaft having a top face;
- a cover attached to the actuator base so as to cover the lens holder in such a manner that the cover comes into contact with or comes close to the top face of the shaft;
- protrusions disposed on the actuator base in such a manner that the protrusions do not contact the shaft, the protrusions protruding toward the lens holder;
- an annular blade section formed on the actuator base opposing face and the cover opposing face of the lens holder in such a manner that the annular blade section surrounds the shaft hole, the annular blade section having substantially triangular section and a protruding length smaller than that of the protrusions;
- a focusing coil disposed on the lens holder;
- and
- a tracking coil disposed on the lens holder, wherein the lens holder is capable of sliding in a focusing direction along the shaft by an excitation of the focusing coil and also capable of oscillating around the shaft in a tracking direction by an excitation of the tracking coil, and
- when the protrusions contact the lens holder, a predetermined gap is formed between the lens holder and the actuator base, the gap is communicated with a space in the cover through the side of the protrusions.
7 more elements
Dependencies are inferred from the claim text.