Optical head and optical pickup device

• US 20070014204A1
• Filed: 06/27/2006
• Published: 01/18/2007
• Est. Priority Date: 06/02/2005
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Kasuga, Kyoji, Yoshizawa, Akiho
• Granted Patent: US 8,102,752 B2
• Time in Patent Office: Days
• US Class Current: 369/44.140
• CPC Class Codes: G11B 7/082 Aligning the head or the light source relative to the record carrier otherwise than during transducing, e.g. adjusting tilt set screw during assembly of head

Abstract

An optical head comprises a laser holder retaining a laser diode, and a holder support retaining the laser holder, and irradiates an information storage medium with laser light from the laser diode to perform recording/reproduction of information. In this optical head, the laser holder is a frame structure that fixes the laser diode, having an abutment portion protruding from a base side of the frame structure. Also, the holder support has a receiving surface that supports by abutment the abutment portion, and a through-hole that lets pass the laser light. The receiving surface is a plane approximately perpendicular to an optical axis of the optical head, the abutment portion being made as an arc surface having a central axis that passes through an emission point of the laser diode and is perpendicular to the optical axis.

Claims

1. An optical head comprising a laser holder retaining a laser diode, and a holder support retaining the laser holder, for irradiating an information storage medium with laser light from the laser diode to perform recording/reproduction of information, wherein

the laser holder is a frame structure that fixes the laser diode, having an abutment portion protruding from a base side of the frame structure,

the holder support has a receiving surface that supports by abutment the abutment portion, and a through-hole that lets pass the laser light, and

the receiving surface is a plane approximately perpendicular to an optical axis of the optical head, the abutment portion being an arc surface having a central axis, which passes through an emission point of the laser diode and is perpendicular to the optical axis.

2. The optical head according to claim 1, wherein the abutment portion is formed in a pair, respectively in two opposing locations of the frame structure.

3. The optical head according to claim 1 or 2, wherein

the laser holder has a vertex portion corresponding to the abutment portion, at a head side opposing the base side, and

the holder support has a pressure means for pressing the vertex portion in a direction in which the abutment portion presses the receiving surface.

4. The optical head according to claim 3, wherein

the vertex portion is a protuberance made up by an arc surface having the central axis, and

the pressure means is configured to press the vertex portion by a pressure part having an even pressure surface perpendicular to the optical axis.

5. The optical head according to claim 4, wherein the distance from the central axis to the arc surface of the abutment portion is smaller than the distance from the central axis to the arc surface of the vertex portion.

6. The optical head according to any one of claims 1, 2, 4, and 5, wherein the abutment portion has a taper surface continuously tangentially connecting to the arc surface.

7. The optical head according to claim 3, wherein the abutment portion has a taper surface continuously tangentially connecting to the arc surface.

11. The optical head according to any one of claims 1, 2, 4, 5, 7, 8, and 9, wherein the holder support is unified with the housing of an optical pickup device.

12. The optical head according to claim 3, wherein the holder support is unified with the housing of an optical pickup device.

13. The optical head according to claim 6, wherein the holder support is unified with the housing of an optical pickup device.

15. An optical pickup device for irradiating an information storage medium with laser light from an optical head to perform recording/reproduction of information, wherein the optical head is an optical head according to any one of claims 1 to 14.

8. An optical head comprising a laser holder retaining a laser diode, and a holder support retaining the laser holder, for irradiating an information storage medium with laser light from the laser diode to perform recording/reproduction of information, wherein

the laser holder is a frame structure that fixes the laser diode, provided with an abutment portion having a protruding ridge portion of two intersecting planes at a base side of the frame structure,

the holder support has a receiving surface that supports by abutment the abutment portion, and a through-hole that lets pass the laser light, and

the receiving surface is a plane approximately perpendicular to an optical axis of the optical head, the ridge portion coinciding with a straight line that passes through an emission point of the laser diode and is perpendicular to the optical axis.

9. The optical head according to claim 8, wherein the abutment portion is formed in a pair, respectively in two opposing locations of the frame structure.

10. The optical head according to claim 8 or 9, wherein

the laser holder has a vertex portion corresponding to the abutment portion at a head side opposing the base side, the vertex portion being a protuberance made of an arc surface that has the ridge portion as central axis,

the holder support has a means for pressing the vertex portion by a pressure part having an even pressure surface perpendicular to the optical axis.

14. The optical head according to claim 10, wherein the holder support is unified with the housing of an optical pickup device.