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US 7,257,828 B2Granted
Optical head device
AssigneeFunai Electric Co., Ltd.
InventorTatsuya Ito
Life of this patent
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AssigneeFunai Electric Co., Ltd.
InventorTatsuya Ito
Estimating the term…
An optical head device includes a base member having an attachment surface passing a laser beam of light reflected by an optical disk, a block in the form of a wedge having an attachment surface adjacent to that of the base member and an attachment surface opposite that adjacent to the base member's attachment surface, and a photodetector arranged on the block's attachment surface opposite that adjacent to the base member's attachment surface to receive a laser beam of light having passed through the base member's attachment surface. The block's attachment surface opposite that adjacent to the base member's attachment surface inclines relative to the base member's attachment surface. The optical head device further includes adhesive fixing the block on the base member's attachment surface at a desired position and adhesive fixing the photodetector on the block's attachment surface opposite that adjacent to the base member's attachment surface at a desired position.
An optical head device comprising:
An optical head device comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Heads, e.g. forming of the optical beam spot or modulation of the optical beam: apparatus or processes for the manufacture of optical heads, e.g.…
Heads, e.g. forming of the optical beam spot or modulation of the optical beam: optical detectors therefor
Information storage based on relative movement between record carrier and transducer
Term ended 24 Jun 2025 (estimated)
1. Field of the Invention
The present invention relates generally to optical head devices and particularly to optical head devices having a structure positionally adjusting a photodetector.
2. Description of the Background Art
In the drawings:
FIG. 1 is a cross section of an optical head device of the present invention in an embodiment;
FIG. 2 is a cross section of the FIG. 1 device taken along a line II-II;
The present invention in an embodiment will now be described with reference to the drawings.
With reference to FIG. 1, an optical head device 1 includes a base member 3 in the form of a box, a laser diode 13, a half mirror 17 and a mirror 15 arranged internal to base member 3, a block 8 in the form of a wedge arranged on an attachment surface 3a located at an outer perimeter of base member 3, and a photodetector (PDIC) 5 arranged on block 8 at an attachment surface 8b. Block 8 has an attachment surface 8a opposite attachment surface 8b. Block 8 is arranged on base member 3 with attachment surface 8a in contact with attachment surface 3a.
Base member 3 and block 8 are both formed of aluminum. Alternatively, base member 3 and block 8 may be formed of plastic. If plastic is used, optical head device 1 can be reduced in weight and also produced at a reduced cost.