JP2008123578A - Optical pickup and optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical pickup and an optical disk device which are advantageous for improving optical characteristics by surely attaching a light source to a base. <P>SOLUTION: A holder 20 for holding a laser diode 12 includes a substrate part 22 and a support plate part 24. A flat holder side adhesive surface 28 is formed in one surface of the substrate part 22 in a thickness direction. An opening 30 is disposed in the center of the holder side adhesive surface 28, and an optical beam from the laser diode 12 is emitted through the opening 30. In two places of the holder side adhesive surface 28 via the opening 30, attaching projections 32 are formed in parallel at the same height from the holder side adhesive surface 28. The attaching projections 32 are attached to the attaching surface 15 of the a base 14, whereby a gap is generated between the attaching surface 15 and the holder side adhesive surface 28 by the attaching projections 32. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical pickup that records and reproduces signals on an optical disc, and an optical disc apparatus having such an optical pickup.

There is an optical pickup that records or reproduces a signal or performs recording and reproduction by irradiating an optical beam such as a DVD (Digital Versatile Disk) with an optical beam.
In many cases, an optical pickup includes a laser diode (semiconductor laser) as a light source for irradiating a light beam, and a base for holding various optical components and light receiving elements through which the light beam passes.
And the laser diode is hold | maintained at the holder and the holder is adhere | attached on the attachment surface provided in the base with the adhesive agent (refer patent document 1).
JP 2001-160228 A

By the way, when bonding the holder to the base, the holder holding the laser diode is held by the adjusting jig, and the optical axis of the laser diode is positioned using the adjusting jig, for example, instantaneous bonding. The holder and the mounting surface are temporarily bonded using an agent.
Next, a method is adopted in which the adjustment jig is removed from the holder, and the holder is attached to the attachment surface with an ultraviolet curable adhesive or the like.
Here, if the adhesive does not sufficiently wrap around the holder and the attachment surface in the temporary bonding, the temporary fixing force of the holder is insufficient. If the temporary fixing force of the holder is insufficient, the position of the holder is shifted due to the shrinkage of the adhesive during the main bonding, and therefore the position of the optical axis of the laser diode is shifted, thereby improving the optical characteristics of the optical pickup. It is feared that there will be a disadvantage.
The present invention has been made in view of such circumstances, and an object thereof is to provide an optical pickup and an optical disc apparatus which are advantageous in improving optical characteristics by securely attaching a light source to a base.

In order to achieve the above object, the present invention provides an optical pickup that irradiates an optical disc with a recording and / or reproducing light beam and detects a reflected light beam reflected by the optical disc, and emits the light beam. A light source, a holder for holding the light source, a light detection element for detecting the reflected light beam, and a base to which the holder and the light detection element are attached, wherein the base is attached to the holder. The holder has a holder-side adhesive surface disposed facing the attachment surface, an opening provided on the holder-side adhesive surface from which the light beam is emitted, and the opening At two places on the holder side adhesive surface across the holder, the abutting projections extending at the same height from the holder side adhesive surface and the hobbed upright from the outer periphery of the holder side adhesive surface And a concave portion for pouring the adhesive provided at a position on the extension of the abutting ridge at a location on the side surface of the da, and the holder has the abutting ridge abutted against the mounting surface In the state, it is attached to the mounting surface by an adhesive.
The present invention also provides a driving means for holding and rotating the optical disk, and a recording and / or reproducing light beam applied to the optical disk rotated and driven by the driving means, and the reflected light beam reflected by the optical disk is irradiated. An optical disc apparatus having an optical pickup for detection, wherein the optical pickup includes a light source that emits the light beam, a holder that holds the light source, a light detection element that detects the reflected light beam, the holder, and A base to which the photodetecting element is attached, the base having a flat attachment surface to which the holder is attached, and the holder is attached to the holder side so as to face the attachment surface The holder is provided at two locations: a surface, an opening provided on the holder-side adhesive surface and from which the light beam is emitted, and the holder-side adhesive surface sandwiching the opening An abutment ridge extending at an equal height from the adhesive surface, and a position on the extension of the abutment ridge at the side surface of the holder raised from the outer periphery of the holder side adhesive surface And a concave portion for pouring the adhesive provided in a place to be attached, and the holder is attached to the mounting surface with an adhesive in a state where the protruding protrusion is in contact with the mounting surface. And

According to the present invention, since the temporary adhesive injected into the adhesive pouring recess flows along the projecting ridge over the entire length of the projecting ridge, the temporary adhesive spreads over a wide area, and the base of the holder The temporary fixing force with respect to can be made sufficient.
Therefore, even if the adhesive shrinks when the adhesive is cured, the positional displacement of the holder with respect to the base is surely prevented, and therefore the positional displacement of the light source is prevented, and the optical characteristics of the optical pickup are improved. It will be advantageous.

Next, an embodiment of the present invention will be described.
First, an optical disc apparatus incorporating the optical pickup of the present invention will be described.
FIG. 1 is a block diagram showing the configuration of an optical disc apparatus incorporating the optical pickup of the present embodiment.
The optical disk apparatus 100 reproduces data by irradiating the optical disk 101 with a light beam for reproduction by the optical pickup 10 and detecting the light beam reflected from the optical disk 101 by the light detection element (photodetector) 11, or Data is recorded by irradiating the optical disk 101 with a recording light beam from the optical pickup 10.
The optical disc apparatus 100 includes a spindle motor 102, an optical pickup 10 of the present invention, a driver 104, a driver control unit 106, an amplifier 108, a signal processing unit 110, a control unit 112, an input / output unit 114, a D / A converter 116 and a recording control circuit 118 are included.
The spindle motor 102 constitutes a driving unit that rotationally drives the optical disc 101.
The optical pickup 10 irradiates an optical disk 101 with a light beam to read and write data, and has a laser diode (light source) 12 that irradiates the light beam.
The driver 104 drives the spindle motor 102 and moves the optical pickup 10.
The driver control unit 106 controls the driver 104.
The amplifier 108 generates a focus error signal, a tracking error signal, an RF signal, and the like based on various signals output from the light detection element 11 in the optical pickup 10.
The signal processing unit 110 performs predetermined processing such as demodulation and error correction processing based on the output signal from the amplifier 108.
The control unit 112 controls the servo as a whole by outputting a focus error signal and tracking error signal to the driver control unit 106.
The input / output unit 114 is for inputting operation information of the apparatus and displaying the operation state of the apparatus.
The D / A converter 116 D / A converts signals from the signal processing unit 110 and the control unit 112 and inputs the signals to the input / output unit 114.
The recording control circuit 118 receives a signal recorded on the optical disc 101 as a reproduction signal, modulates the data by the signal processing unit 110, drives the light source (laser diode) 12 in the optical pickup 10, and sends it to the driver control unit 106. Servo information is output.

Next, the optical pickup 10 of the present embodiment will be described.
2 is a perspective view of the optical pickup 10 of the present embodiment, FIG. 3 is a perspective view showing a state in which the laser diode 12 is attached to the base via the holder, and FIG. 4 is a state in which the laser diode 12 is held by the holder. FIG.
As shown in FIG. 2, the optical pickup 10 has a base 14 having a plate shape. The base 14 includes a light detection element 11 (see FIG. 1), a laser diode 12, an optical member (not shown), an objective lens, and a lens holder. , Actuators and the like are provided.
The laser diode 12 is attached to the base 14 via a holder 20 which will be described later. The laser diode 12 is turned on when a drive signal is supplied and emits a light beam.
As shown in FIGS. 3 and 4, the laser diode 12 includes a main body 1202 that houses a semiconductor chip that emits a light beam, an emission surface 1204 that is provided at the front end of the main body 1202 and emits the light beam, and a main body 1202. A plurality of lead wires 1206 are provided so as to protrude from the rear end and supply a drive signal to the semiconductor chip.

The optical member forms an optical path that guides the light beam emitted from the laser diode 12 to the objective lens and guides the light beam from the objective lens to the light detection element 11. The optical component includes, for example, a prism or mirror that bends the optical path, a collimator lens that focuses the light beam, and the like.
The objective lens focuses the light beam and irradiates the recording surface of the optical disc 101, and guides the light beam reflected by the recording surface to the optical member.
The lens holder holds the objective lens.
The actuator drives the lens holder in a tracking direction and a focus direction.

The base 14 is formed by molding a synthetic resin material or machining a metal material.
Bearings are provided on both sides of the base 14 in the longitudinal direction, and a main guide shaft 16 extending in a direction parallel to the radial direction of the optical disk 101 and a sub guide shaft (not shown) are slidably connected to the bearings. Yes.
The base 14 is configured to be moved in the radial direction of the optical disc 101 along the main guide shaft 16 and the sub guide shaft by a driving mechanism (not shown) driven by the driver 104. The drive mechanism is, for example, a drive mechanism having a female screw provided on the base 14, a feed screw screwed to the female screw, a motor for rotating the feed screw, or a drive mechanism having a linear motor. Various conventionally known configurations such as these can be employed.
As shown in FIGS. 2 and 3, a flat attachment surface 15 for attaching the holder 20 is formed on the side surface 1402 of the base 14.
The mounting surface 15 has a light beam introduction opening (not shown) communicating with the optical member.

The holder 20 holds the laser diode 12.
The holder 20 is formed of a material having excellent thermal conductivity, and a metal material can be adopted as such a material.
As shown in FIGS. 3 and 4, the holder 20 includes a substrate portion 22 and a support plate portion 24.
The substrate portion 22 has a substantially rectangular plate shape, and the support plate portion 24 is erected from one surface of the substrate portion 22 in the thickness direction.
An accommodation recess 26 is formed at a location facing the support plate 24 on one surface in the thickness direction. The main body 1202 of the laser diode 12 has its emission surface 1204 facing the bottom of the receiving recess 26 and the side surface of the main body 1202 is applied to the support plate 24 in a state where the main body 1202 is received in the receiving recess 26. An adhesive is applied between 1202 and the accommodating recess 26 and the support plate portion 24, whereby the laser diode 12 is attached to the holder 20.

A flat holder-side adhesive surface 28 is formed on one surface in the thickness direction of the substrate portion 22.
An opening 30 is provided at the center of the holder-side adhesive surface 28, and this opening 30 communicates with the bottom of the housing recess 26. That is, the light beam from the emission surface 1204 of the laser diode 12 is emitted through the opening 30.
At two locations on the holder-side adhesive surface 28 across the opening 30, the abutting projections 32 are formed to extend in a straight line in parallel with each other at the same height from the holder-side adhesive surface 28.
In the present embodiment, the tip end in the height direction of the abutting projection 32 is formed by a flat surface 32 </ b> A parallel to the holder-side adhesive surface 28.
The abutting ridge 32 is a portion applied to the mounting surface 15 when the holder 20 is attached to the base 14, and the abutting ridge 32 is applied to the mounting surface 15. A gap is formed between the attachment surface 15 and the holder-side adhesive surface 28 by the strip 32. The gap is preferably a value that is sufficient to secure a temporary fixing force of the temporary adhesive described later. In the present embodiment, the value of the gap is, for example, 30 μm. The height of the convex protrusion 32 is, for example, 30 μm.

A side surface 2202 is erected from the periphery of the holder-side adhesive surface 28.
Groove portions 2210 for gripping by the adjusting jig are formed at two opposing positions on the side surface 2202.
In addition, an adhesive pouring recess 34 is provided at each side 2202 located on the extension of the abutting projection 32.

Next, attachment of the holder 20 holding the laser diode 12 to the base 14 will be described.
The groove portion 2210 of the holder 20 is gripped by an adjustment jig, and the opening 30 faces the opening for introducing the light beam on the mounting surface 15 as shown in FIG. .
In this state, the laser diode 12 is turned on, and the holder 20 is moved within the plane orthogonal to the light beam of the laser diode 12 by the adjusting jig while maintaining the state where the bumps 32 for application are applied to the attachment surface 15. The holder 20 is positioned so that the light beam and the optical axis of the optical member and the objective lens coincide with each other.
When the positioning of the holder 20 is completed, the temporary adhesive is injected into the two adhesive casting recesses 34 from the needle (thin tube needle) of the dispenser for applying the temporary adhesive. In this embodiment, an instantaneous adhesive is used as the temporary adhesive.
Then, the temporary adhesive flows into the gap formed between the attachment surface 15 and the holder-side adhesive surface 28 by capillary action.
At this time, the temporary adhesive is provided with the protruding protrusions 32 extending so that the temporary adhesive flows along the protruding protrusions 32 over the entire length of the protruding protrusions 32 and is wide. Spread over the area.

When the temporary adhesive flowing in in this way is cured and the holder 20 and the base 14 are temporarily bonded, the adjustment jig is removed from the groove portion 2210 of the holder 20 and the periphery of the side surface 2202 of the holder 20 is released. .
In this state, the adhesive is applied to a plurality of locations along the circumferential direction of the side surface 2202 between the side surface 2202 of the holder 20 and the attachment surface 15 from the needle of another dispenser for applying the adhesive. In this embodiment, an ultraviolet curable adhesive is used as the present adhesive.
Then, the applied adhesive is cured. In this embodiment, the ultraviolet curable adhesive is cured by being irradiated with ultraviolet rays.
Thus, the attachment of the holder 20 holding the laser diode 12 to the base 14 is completed.

As described above, according to the present embodiment, since the temporary adhesive flows along the projecting ridge 32 over the entire length of the projecting ridge 32, the temporary adhesive spreads over a wide area, and the holder 20 The temporary fixing force with respect to the base 14 can be made sufficient.
Therefore, even if the adhesive shrinks when the adhesive is cured, the positional displacement of the holder 20 with respect to the base 14 is reliably prevented, and therefore the positional deviation of the optical axis of the laser diode 12 is prevented. This is advantageous for improving optical characteristics.
Further, in the present embodiment, since the two abutting projections 32 extend in parallel to each other, the adhesive pouring recess 34 is positioned higher than the abutting projections 32 and applied. When the base 14 and the holder 20 are directed so that the protruding ridges 32 extend in the vertical direction, the temporary adhesive injected from the adhesive casting recess 34 smoothly flows along the two protruding ridges 32. Therefore, it is advantageous to obtain a sufficient temporary fixing force.
Further, in the present embodiment, since the adhesive casting recess 34 is located on the extension of the abutment projection 32, the temporary adhesive injected from the adhesive casting recess 34 has two abutment projections. 32 can flow more smoothly along the line 32 and is therefore more advantageous in obtaining a sufficient temporary fixing force.
Further, in the present embodiment, since the tip in the height direction of the abutting ridge 32 is formed by the flat surface 32A parallel to the holder-side adhesive surface 28, the mounting surface 15 has a more accurate angle. The holder 20 can be temporarily fixed, which is advantageous in improving the optical characteristics of the optical pickup 10.

In the present embodiment, the case where the tip in the height direction of the abutting ridge 32 is formed by a flat surface 32A parallel to the holder-side adhesive surface 28 has been described. Of course, even if the tip in the height direction is formed with an edge parallel to the holder-side adhesive surface 28, the same effect as described above can be obtained.
Further, in the present embodiment, the case where the projecting protrusions 32 provided at two locations on the holder-side adhesive surface 28 extend in parallel with each other has been described. For example, you may extend in the direction which mutually cross | intersects like a C shape.
Further, in the present embodiment, in the state where the holder side adhesive surface 28 is viewed in plan, the abutting projection 32 extends in parallel with the side surface 2202 that forms two opposite sides of the four sides of the holder side adhesive surface 28. Although the case where it exists is demonstrated, the protrusion 32 for abutment may be extended in the direction which cross | intersects with respect to the side 2202.
Further, the bumps 32 for application are not limited to those extending linearly, but may extend in an arc shape or a curved shape.
However, as in the present embodiment, when the abutting ridges 32 extend in a straight line parallel to each other, the abutting ridges 32 are extended in the vertical direction, whereby the adhesive is poured. The temporary adhesive injected from the concave portion 34 can smoothly flow along the two ridges 32 for application, and is therefore more advantageous in obtaining a sufficient temporary fixing force.
In the present embodiment, the description has been given of the case where the abutting ridges 32 are provided at two locations on the holder-side adhesive surface 28 across the opening 30, and thus the two abutting ridges 32 are provided. Of course, three or more bumps 32 for application may be provided.
Further, in the present embodiment, the case where the adhesive casting recess 34 is positioned on the extension of the abutting projection 32 has been described. However, the adhesive casting recess 34 is provided at the end of the abutting projection 32. It may be located in the vicinity.
However, as in the present embodiment, when the adhesive casting recess 34 is positioned on the extension of the abutting projection 32, the two temporary adhesives injected into the adhesive casting recess 34 are applied. It is more advantageous to reach the attaching ridge 32 smoothly and to obtain a sufficient temporary fixing force.

Next, the heat dissipation structure of the laser diode 12 will be described.
In recent years, there is a tendency to use a high-power laser diode as a light source in order to improve the recording speed of a signal on an optical disc by an optical pickup.
Since a laser diode generates more heat as its output increases, a heat dissipation structure that efficiently dissipates heat generated by the laser diode is required.
5A is a plan view showing a first example of the heat dissipation structure of the laser diode 12, FIG. 5B is a view as seen from the arrow B in FIG. 5A, and FIG. 6 is a view as seen from the arrow C in FIG. .
As shown in FIGS. 5 and 6, a heat radiating plate 36 covering the upper surface 1404 is attached to the base 14.
The heat radiating plate 36 is made of a material having high thermal conductivity. As such a material having high thermal conductivity, for example, a metal material can be adopted.
A projecting piece 38 projects from the edge of the heat radiating plate 36 facing the upper portion of the holder 20, and an open cutout 3802 is formed outward from the tip of the projecting piece 38.
The projecting piece 38 is formed thinner than the other heat radiating plate 36, and a gap S is formed between the upper portion of the holder 20 and the lower surface of the projecting piece 38 facing the upper portion, as shown in FIG. Is formed.
A heat radiation agent H is applied to the gap S (between the protruding piece 38 and the upper portion of the holder 20).
Although the thermal radiation agent H has fluidity | liquidity, what is hardened | cured with progress of time is used.
Specifically, the heat radiation agent H is applied as follows.
The paste-like heat-dissipating agent H is injected into the cutout 3802 from the needle of the dispenser for applying the heat-dissipating agent.
Then, the heat radiation agent H flows from the notch 3802 toward the gap S, and the heat radiation agent H is reliably applied to the gap S.

According to such a configuration, the following effects are exhibited.
When the heat radiation agent H is applied, the needle for supplying the heat radiation agent may be abutted against a clearly defined portion of the notch 3802, which is advantageous in improving workability.
Since the heat radiation agent H can be reliably applied to the gap S between the holder 20 and the heat radiating plate 36 as a heat source, the heat of the laser diode 12 is radiated by the heat radiating plate 36 through the holder 20, the heat radiating agent H, and the projecting piece 38. The heat transfer efficiency is good, which is advantageous in improving the heat dissipation efficiency of the laser diode 12.
Since the gap S formed between the projecting piece 38 and the upper portion of the holder 20 is a place where it is difficult to touch from the outside, the heat-dissipating agent H applied and cured in the gap S is touched and flows out from the outside. This is advantageous in preventing problems such as adhesion of H to touched objects.
Since the heat radiation agent H is applied to a limited area such as the holder 20 and the projecting piece 38, the influence of the stress such as shrinkage when the heat radiation agent H is cured on the base 14 via the holder 20 and the heat radiation plate 36 can be reduced. This is advantageous in improving the optical characteristics of the optical pickup 10.
A simple configuration in which the projecting piece 38 is provided on the heat radiating plate 36 is sufficient, and it is not necessary to provide a dedicated member separately, which is advantageous in reducing the cost.

Next, a second example of the heat dissipation structure will be described.
FIG. 7A is a plan view showing a second example of the heat dissipation structure of the laser diode 12, and FIG. 7B is a sectional view taken along line BB of FIG.
As shown in FIG. 7, in the second example, similarly to the first example, a heat radiating plate 36 covering the upper surface 1404 is attached to the base 14.
A heat sink coating recess 40 having a thickness smaller than that of the other heat sink 36 is formed on the lower surface of the heat sink 36 facing the upper portion of the holder 20, and a gap S <b> 1 is formed above the holder 20 by the recess 40. Yes.
A heat-dissipating agent application hole 42 communicating with the heat-dissipating agent application recess 40 is formed on the upper surface of the heat dissipation plate 36 located on the opposite side of the heat-dissipating agent application recess 40.
The heat-dissipating agent application hole 42 is formed so that its inner diameter gradually decreases from the upper surface of the heat-radiating plate 36 downward, and is formed in a so-called taper shape.
The heat radiation agent H is applied to the gap S1 (between the heat radiation agent application recess 40 and the upper portion of the holder 20).
As in the first example, the heat dissipating agent H has fluidity and hardens with time.
Specifically, the heat radiation agent H is applied as follows.
A paste-like heat-dissipating agent H is injected into the heat-dissipating agent application hole 42 from the needle of the dispenser for applying the heat-dissipating agent.
Then, the heat radiation agent H flows from the heat radiation agent application hole 42 toward the gap S1, and the heat radiation agent H is reliably applied to the gap S1.

According to such a configuration, the following effects are exhibited.
During the application of the heat radiation agent H, the needle for supplying the heat radiation agent may be abutted against a defined portion of the heat radiation agent application hole 42, which is advantageous in improving workability.
Since the heat radiation agent H can be reliably applied to the gap S1 between the holder 20 and the heat radiating plate 36 as a heat source, the heat of the laser diode 12 passes through the holder 20, the heat radiating agent H, and the heat radiating agent application recess 40, and the heat radiating plate 36. Since the heat is radiated, heat transfer efficiency is good, which is advantageous in improving the heat dissipation efficiency of the laser diode 12.
Since the gap S formed between the recess 40 for applying the heat radiation agent and the upper part of the holder 20 is a place where it is difficult to touch from the outside, the heat radiation agent H applied to the gap S and being cured flows out from the outside. This is advantageous in preventing a problem that the heat radiation agent H adheres to the touched material.
Since the heat radiating agent H is applied to a limited area such as the holder 20 and the heat radiating agent application recess 40, stress such as shrinkage when the heat radiating agent H is cured has an influence on the base 14 via the holder 20 or the heat radiating plate 36. This is advantageous in improving the optical characteristics of the optical pickup 10.
The heat dissipation plate 36 has a simple configuration such as providing the heat-dissipating agent application recess 40 and the heat-dissipating agent application hole 42, and it is not necessary to provide a dedicated member separately, which is advantageous in reducing costs.

Next, a structure for attaching the optical member to the base 14 will be described.
FIG. 8 is an explanatory view showing an example of an optical member mounting structure.
The optical member 44 is, for example, a lens through which a light beam emitted from the laser diode 12 or a reflected light beam reflected by the optical disc 101 passes, and has a cylindrical outer peripheral surface 4402 centering on the optical axis. .
The optical member 44 is made of synthetic resin or glass.
An attachment recess 46 for attaching the optical member 44 is provided in the base 14, and the attachment recess 46 is formed in an open shape on the upper surface 1404 of the base 14 through an opening 4602.
The mounting recess 46 includes two side surfaces 48 orthogonal to the upper surface 1404 and two abutting surfaces 50 connected to the lower portions of the side surfaces 48 and facing upward.
Each abutment surface 50 is formed of two flat surfaces that are in contact with two locations spaced in the circumferential direction of the outer peripheral surface 4402 of the optical member 44.
Further, an adhesive application portion 52 for applying an adhesive that adheres the optical member 44 to the mounting recess 46 is formed at a location where the side surface 48 and the upper surface 1404 intersect.
The adhesive application part 52 is configured by an inclined surface obtained by cutting off a corner where the side surface 48 and the upper surface 1404 intersect. It is needless to say that the adhesive application part 52 is not limited to the inclined surface shown in FIG.

A plate spring 54 is provided so as to close the opening 4602, and the optical member 44 is temporarily fixed to the mounting recess 46 by the plate spring 54, and the plate spring 54 is attached to the upper surface 1404, for example.
The optical member 44 is accommodated in the mounting recess 46, the outer peripheral surface 4402 is pressed downward by the leaf spring 54, and the outer peripheral surface 4402 is abutted against each abutting surface 50 to be temporarily fixed.
In this state, the optical member 44 is moved back and forth along the optical axis direction using the adjustment jig, or the optical member 44 is rotated around the optical axis to adjust the position, and then the adhesive is bonded to the outer peripheral surface 4402. The optical member 44 is fixed to the mounting recess 46 by being applied between the adhesive application portion 52 and curing the adhesive.

By the way, when performing the positioning adjustment by moving the optical member 44 in the optical axis direction, the outer peripheral surface 4402 of the optical member 44 is smoothly slid with respect to the respective abutting surfaces 50. A lubricant is applied to the attachment surface 50.
If this lubricant spreads to the adhesive application part 52, there is a concern that the fixing force of the adhesive for attaching the optical member 44 may be reduced.
Therefore, as shown in FIG. 9, if a recess 56 having a depth in the direction along the side surface 48 is formed at the connection portion between the contact surface 50 and the side surface 48, the coating is applied to each contact surface 50. This prevents the lubricant from staying in the recess 56 and preventing the lubricant from spreading to the adhesive application part 52, which is advantageous in securing the fixing force of the adhesive of the optical member 44.

However, since the processing for forming such a recess 56 is complicated, there is a disadvantage in reducing the cost, and the recess 56 occupies a space, which is disadvantageous in reducing the size.
Therefore, as shown in FIG. 10, instead of forming the recess 56 in the connection portion between the abutting surface 50 and the side surface 48, the upper portion of the abutting surface 50 is cut out along the direction perpendicular to the side surface 48. A belt-like flat surface portion 58 that is orthogonal to the upper surface 1404 and parallel to the upper surface 1404 may be formed.
When such a plane portion 58 is formed, the lubricant applied to each abutment surface 50 stays at the corner formed between the connection portions between the plane portion 58 and the side surface 48, and the lubricant is applied to the adhesive application portion. Of course, it is advantageous for preventing the spread to 52 and securing the fixing force of the adhesive of the optical member 44, and in the case of forming the concave portion 56 in the process of forming such a flat portion 58. Compared to the concave portion 56, the space occupied by the flat surface portion 58 is smaller than that of the concave portion 56. Therefore, it is advantageous for downsizing.

It is a block diagram which shows the structure of the optical disk apparatus incorporating the optical pick-up of this Embodiment. 1 is a perspective view of an optical pickup 10 of the present embodiment. It is a perspective view which shows the state in which the laser diode 12 was attached to the base through the holder. It is a perspective view in the state where laser diode 12 was held by a holder. (A) is a top view which shows the 1st example of the thermal radiation structure of the laser diode 12, (B) is a B arrow view of (A). It is C arrow line view of FIG. 5 (A). (A) is a top view which shows the 2nd example of the thermal radiation structure of the laser diode 12, (B) is BB sectional drawing of (A). It is explanatory drawing which shows an example of the attachment structure of an optical member. It is explanatory drawing which shows the other example of the attachment structure of an optical member. It is explanatory drawing which shows the further another example of the attachment structure of an optical member.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Optical pick-up, 12 ... Laser diode, 14 ... Base, 20 ... Holder, 15 ... Mounting surface, 28 ... Holder side adhesive surface, 30 ... Opening, 32 ... Projection ridge, 34: concave portion for pouring adhesive, 100: disc device.

Claims (5)

An optical pickup that irradiates an optical disk with a recording and / or reproducing light beam and detects a reflected light beam reflected by the optical disk,
A light source that emits the light beam;
A holder for holding the light source;
A light detecting element for detecting the reflected light beam;
A base to which the holder and the light detection element are attached;
The base has a flat mounting surface to which the holder is attached;
The holder is
A holder side adhesive surface arranged facing the mounting surface;
An opening provided in the holder-side adhesive surface from which the light beam is emitted;
Abutment ridges extending at the same height from the holder side adhesive surface at two locations on the holder side adhesive surface across the opening,
An adhesive pouring recess provided at a location located on the extension of the abutting projection at the location of the side surface of the holder raised from the outer periphery of the holder-side adhesive surface;
The holder is attached to the attachment surface with an adhesive in a state where the projection for contact is in contact with the attachment surface,
An optical pickup characterized by that. The tip in the height direction of the abutting ridge is formed by a flat surface parallel to the holder-side adhesive surface,
The optical pickup according to claim 1. The bumps for application provided at two locations on the holder-side adhesive surface extend in parallel with each other,
The optical pickup according to claim 1. A gap is formed between the attachment surface and the holder-side adhesive surface by applying the abutting ridge to the holder-side adhesive surface,
Adhesion to the mounting surface of the holder is performed by the temporary adhesive that has flowed into the gap, and the present adhesive applied across a plurality of locations around the holder and the mounting surface,
The size of the gap is formed with a value sufficient to ensure sufficient adhesive strength of the temporary adhesive,
The optical pickup according to claim 1. Driving means for holding and rotating the optical disc;
An optical disc apparatus comprising: an optical pickup for irradiating a recording and / or reproducing light beam to an optical disc rotated and driven by the driving means, and detecting a reflected light beam reflected by the optical disc;
The optical pickup is
A light source that emits the light beam;
A holder for holding the light source;
A light detecting element for detecting the reflected light beam;
A base to which the holder and the light detection element are attached;
The base has a flat mounting surface to which the holder is attached;
The holder is
A holder side adhesive surface arranged facing the mounting surface;
An opening provided in the holder-side adhesive surface from which the light beam is emitted;
Abutment ridges extending at the same height from the holder side adhesive surface at two locations on the holder side adhesive surface across the opening,
An adhesive pouring recess provided at a location located on the extension of the abutting projection at the location of the side surface of the holder raised from the outer periphery of the holder-side adhesive surface;
The holder is attached to the attachment surface with an adhesive in a state where the projection for contact is in contact with the attachment surface,
An optical disc device characterized by the above.

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