JP2005032316A - Optical pickup device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical pickup device having an adhesive structure capable of stably and easily adhering the optical axis of an optical element with high accuracy. <P>SOLUTION: This optical pickup device is provided with: an objective lens drive unit; an optical element having light emitting and receiving devices; and a frame in which they are housed and one or both of the light emitting and receiving devices are positioned and adhered with first and second adhesives through the fixing member 8 of each device. A first adhesive diffusion preventing means is formed for preventing the diffusion of the first adhesive into a coating area 35 of the second adhesive in one or both of the surface of the frame side of the fixing member 8 and the surface of the fixing member side of the frame. As the first adhesive diffusion preventing means, a space structure or a groove 41 formed by the expansion of a space between the fixing member and the frame is disposed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical pickup device used for recording / reproduction of an optical recording medium such as a CD (compact disc) or a DVD (digital versatile disc), and more particularly, to stably adhere a light emitting element and a light receiving element to a frame. The present invention relates to an adhesive structure that can be used.
[0002]
[Prior art]
An optical pickup device used for recording / reproduction of an optical recording medium such as a CD or a DVD has an objective lens driving device facing the optical recording medium, an optical element having a light emitting element and a light receiving element, and housing or mounting them. In addition, a frame in which one or both of the light emitting element and the light receiving element is positioned and bonded via a fixing member for each element is mainly configured.
[0003]
Among optical pickup devices, for example, an optical pickup device that performs recording / reproduction for both CD, CD-R, and DVD includes a laser diode that is a light emitting element for DVD and a laser diode that is a light emitting element for CD. In such an optical pickup device, the emitted light emitted from the laser diode is applied to the optical recording medium by the optical element housed in the frame and the objective lens driving device, and the reflected light reflected by the optical recording medium is the same optical The light enters the light receiving element via the element, receives the reflected light by the light receiving element, undergoes OE conversion, and is sent to a reproducing apparatus (not shown).
[0004]
FIG. 2 is a layout explanatory diagram showing an example of the optical element 3 in the optical pickup device. The laser light L1 emitted from the light emitting element 4 that is a laser diode for DVD passes through the half mirror 21 and the prism 22, is bent in the direction of the objective lens by a reflection mirror (not shown) immediately below the objective lens, and is focused by the objective lens 23. It is adjusted and irradiated to the optical recording medium. On the other hand, the laser light L2 emitted from the light emitting element 5 which is a laser diode for CD is bent by the prism 22, and further bent in the direction of the objective lens by the reflection mirror immediately below the objective lens, and the focus is adjusted by the objective lens 23 to perform optical recording. The medium is irradiated. Such irradiation light is reflected by the optical recording medium to be reflected light, bent by the reflecting mirror immediately below the objective lens 23, transmitted through the prism 22, bent by the half mirror 21, and transmitted through the sensor lens 24 to receive the light receiving element. 6 is focused and incident on the photodiode.
[0005]
Therefore, in an optical pickup device equipped with such an optical element, the position of each optical element (especially the light emitting element and the light receiving element) is accurately adjusted (optical axis alignment) in order to perform recording and reproduction accurately. It is necessary to be fixed with adhesive. When these optical elements are fixed to the frame, first, the laser diode for DVD is bonded and fixed to the frame, and then the light receiving element is bonded and fixed to the side of the frame while monitoring the received light signal. While monitoring the received light signal, the CD laser diode is fixed to the side of the frame with an adhesive.
[0006]
Adhesion and fixing of the light emitting element and the light receiving element are performed by adhering a fixing member in which those elements are bonded or press-fitted in advance to the frame. For example, in Patent Document 1 below, a concave portion for holding an adhesive for accumulating an adhesive is formed on a side surface of a frame, and a predetermined amount of uncured photocurable adhesive is discharged into the concave portion to align the amount and shape of the adhesive. Thus, it has been proposed that a fixing member having a photodetector as a light receiving element can be bonded and fixed at an accurate position in the optical axis direction (Z-axis direction). In this bonding method, it is necessary to strictly control the application amount of the adhesive, and its management is difficult.
[0007]
As an adhesion method other than the above, for example, as shown in the front view of FIG. 9A, the X-axis and Y-axis directions of the optical element 86 are adjusted by adjusting the adhesion position between the fixing member 81 and the frame 82. The way is done. In this method, for example, as shown in the partial plan view of FIG. 9B, an organic solvent type adhesive 83 having a low viscosity is poured into a gap 85 between the fixing member 81 and the frame 82, and then temporarily bonded. This is performed by pouring an adhesive 84 having a long-term adhesive reliability into the gap 85 and performing the main bonding. In this method, two types of adhesives 83 and 84 are poured into the gap between the fixing member 81 and the frame 82 and quickly diffused.
[0008]
[Patent Document 1]
JP 2001-291272 A [0009]
[Problems to be solved by the invention]
In the above-described bonding method, as shown in FIG. 9, temporary fixing is performed with a low-viscosity adhesive 83 from both the left and right sides of the fixing member 81, and then the adhesive 84 is applied from both the upper and lower sides of the fixing member 81 to perform main bonding. In this case, however, the phenomenon that the low-viscosity adhesive 83 at the time of temporary bonding diffuses into the region R where the main bonding is performed (same as penetration) and prevents the diffusion of the adhesive 84 for the main bonding. Happens. Such a phenomenon hinders stable adhesion by the adhesive 84 for the main adhesion, and has a problem that long-term reliability for positioning of the optical element 86 is lowered.
[0010]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an optical pickup device having an adhesive structure capable of stably and easily adhering the optical axes of optical elements with high accuracy. There is to do.
[0011]
[Means for Solving the Problems]
In order to solve the above problems, an optical pickup device of the present invention includes an objective lens driving device, an optical element having a light emitting element and a light receiving element, and one or both of the light emitting element and the light receiving element in which they are housed or mounted. A frame that is positioned and bonded with a first adhesive and a second adhesive via a fixing member for each element, the surface of the fixing member on the frame side and the fixing member of the frame One or both of the side surfaces are provided with first adhesive diffusion preventing means for preventing the first adhesive from diffusing into the application area of the second adhesive.
[0012]
According to this invention, the first adhesive diffusion preventing means prevents the first adhesive from diffusing into the application area of the second adhesive, so that the first adhesive applied in advance when the fixing member and the frame are bonded. One adhesive does not diffuse (synonymous with penetration) into the application area of the second adhesive. As a result, since the application area | region of the 2nd adhesive agent apply | coated after that is ensured, the stable adhesion | attachment by an adhesive agent is enabled, and the long-term reliability with respect to positioning of an optical element can be ensured.
[0013]
In the optical pickup device of the present invention, the first adhesive diffusion preventing means has a spatial structure in which a gap between the fixing member and the frame is enlarged.
[0014]
According to this invention, since the space structure is formed by expanding the gap between the fixing member and the frame, the first adhesive that has diffused the gap between the fixing member and the frame is the space structure portion. Diffusion stops.
[0015]
In the optical pickup device of the present invention, the first adhesive diffusion preventing means is a groove.
[0016]
According to the present invention, the diffusion of the adhesive that has diffused through the gap between the fixing member and the frame stops at the groove.
[0017]
In the optical pickup device of the present invention, one or both of the fixing member and the frame is formed with second adhesive diffusion preventing means for preventing the second adhesive from diffusing outside the application area of the second adhesive. It is characterized by being.
[0018]
According to this invention, the second adhesive diffusion preventing means prevents the second adhesive from diffusing outside the second adhesive application region, so that the second adhesion to the region that is not desired to be diffused, for example, the optical element. The diffusion of the agent can be prevented.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an optical pickup device of the present invention will be described with reference to the drawings.
[0020]
(Optical pickup device)
FIG. 1 is an external view showing an example of an optical pickup device of the present invention. 1A is a plan view, FIG. 1B is a front view, FIG. 1C is a rear view, and FIG. 1D is a right side view.
[0021]
An optical pickup device 1 according to the present invention includes an objective lens driving device 2 facing an optical recording medium (not shown), an optical element 3 having light emitting elements 4, 5 and a light receiving element 6, and housing or mounting them. One or both of the light-emitting elements 4 and 5 and the light-receiving element 6 are fixed to the first adhesive and the second through the fixing members 8a, 8b, and 8c for each element (collectively, sometimes denoted by reference numeral 8). A frame 7 that is positioned and bonded with an adhesive and an FPC board 9 that is a circuit board for controlling the objective lens driving device 2 and the optical element 3 are mainly provided.
[0022]
In such an optical pickup device 1, the optical system is as described in FIG. That is, the laser light L1 emitted from the laser diode which is one light emitting element 4 is transmitted through the half mirror 21 and the prism 22, and is bent in the direction of the objective lens by the reflection mirror (not shown) immediately below the objective lens. The focus is adjusted by, and the optical recording medium is irradiated. On the other hand, the laser light L2 emitted from the laser diode which is the other light emitting element 5 is bent by the prism 22, further bent in the direction of the objective lens by the reflection mirror immediately below the objective lens, and the focus is adjusted by the objective lens 23. The optical recording medium is irradiated. The irradiated light is reflected by the optical recording medium to become reflected light, bent by the reflecting mirror immediately below the objective lens 23, transmitted through the prism 22, bent by the half mirror 21, and transmitted through the sensor lens 24 to be received. The light is focused and incident on the photodiode which is the element 6.
[0023]
The objective lens driving device 2 is configured to focus the objective lens 23 that converges the laser beams L1 and L2 emitted from the laser diodes that are the light emitting elements 4 and 5 onto an optical recording medium (for example, an optical disc) and a focusing direction (focusing error correction direction). This is a device for driving control in the tracking direction (tracking error correction direction), comprising a tracking drive coil and a focusing drive coil, and further comprising a tracking drive magnet and a focusing drive magnet.
[0024]
The optical element 3 includes light emitting elements (for example, laser diodes) 4 and 5, a half mirror 21, a prism 22, an objective lens 23, a sensor lens 24, a reflection mirror (not shown), and the like, and is reflected by an optical recording medium. A light receiving element (for example, a photodiode) 6 that receives the reflected light is also included in the optical element. Such an optical element 3 is attached to the fixing member 8 with an adhesive or the like, and further, the fixing member 8 is bonded to the frame 7 with the first adhesive and the second adhesive, thereby being positioned and bonded to a predetermined position.
[0025]
The frame 7 is preferably made of an aluminum die-cast product having the same thickness as the objective lens driving device 2 and extending in the horizontal direction. The inner side is roughly divided into an attachment region for accommodating the optical element 3 described above and an attachment region for accommodating the objective lens driving device 2. A main shaft guide hole 11 made of a round hole and a counter shaft guide groove 12 protruding in a U-shape are formed at both ends of the frame 7. The optical pickup device 1 is arranged in the radial direction of the optical recording medium along a main shaft and a sub shaft (not shown) on the main body side of the recording / reproducing apparatus that are passed through the main shaft guide hole 11 and the sub shaft guide groove 12. Move controlled.
[0026]
The objective lens driving device 2 and the optical element 3 are accommodated in the side surface of the frame or in the frame, and an FPC board 9 is provided for supplying an electric signal to the objective lens driving device 2 and the optical element 3 to control them. Or housed.
[0027]
The frame 7 includes an upper surface portion on the optical recording medium side, and an outer peripheral wall portion extending perpendicularly from the outer peripheral edge portion of the upper surface portion to the lower surface portion on the side opposite to the optical recording disk. The frame 7 has an opening on one or both of the upper surface side and the lower surface side, and the objective lens driving device 2 and the optical element 3 are accommodated from the opening, and are attached to the frame 7 with an adhesive or the like as necessary. Fixed. Further, an upper surface cover that covers the objective lens driving device 2 and an upper surface cover that covers the optical element 3 are mounted on the upper surface side opening of the frame 7. On the other hand, a lower surface cover that covers the objective lens driving device 2 is attached to the lower surface side opening of the frame 7.
[0028]
(Adhesive structure)
In the optical pickup device 1 of the present invention, each optical element 3 (particularly, the light-emitting elements 4 and 5 and the light-receiving element 6) bonded to the fixing member 8 is used to accurately record / reproduce recorded information on / from an optical recording medium. It is necessary to bond and fix to the frame 7 in a state adjusted to a predetermined position. As an aspect of fixing the optical element 3 to the frame 7, first, after fixing the fixing member 8a to which the laser diode, which is the light emitting element 4 for DVD, is attached and fixed to the frame 7, the light receiving element is monitored while monitoring the light receiving signal. The fixing member 8c to which the photodiode 6 is attached is bonded and fixed to the side surface of the frame 7 with an adhesive, and then the light receiving element 6 monitors the received light signal while the laser diode which is the light emitting element 5 for CD is The mounted fixing member 8b is bonded and fixed to the side surface of the frame 7 with an adhesive.
[0029]
FIG. 3 is an explanatory view showing an example of a mode in which the fixing member 8 is bonded and fixed to the frame 7. In the present invention, the fixing member 8 is bonded to the frame 7 by bringing the bonding surface of the fixing member 8 held by the positioning jig 31 into contact with the bonding surface of the frame 7 as shown in FIG. The fixing member 8 is temporarily bonded after adjusting the position only in the X-axis direction and the Y-axis direction (FIG. 3A), and then the jig 31 is removed and the fixing member 8 is permanently bonded ( FIG. 3 (b)).
[0030]
At this time, as shown in FIG. 3 (a), first, a first adhesive 32 for temporary adhesion is applied to the gap between the contact surfaces from the side not held by the positioning jig 31 and diffused. Then, the fixing member 8 is temporarily bonded. Thereafter, the positioning jig 31 is removed, and as shown in FIG. 3B, the second adhesive 33 for the main bonding is applied to the gap between the contact surfaces from the side held by the jig 31. The fixing member 8 is bonded to the frame 7 while being positioned by being diffused.
[0031]
The feature of the present invention is that the first adhesive 32 applied to the gap between the contact surfaces diffuses more than necessary, and the first adhesive diffusion formed on the adherend surface of the fixing member 8 or the adherend surface of the frame 7. It is to prevent by the prevention means. By such first adhesive diffusion preventing means, the first adhesive 32 can be prevented from diffusing to the application area 35 of the second adhesive 33 beyond the application area 34 of the first adhesive, and as a result. Thus, it is possible to secure a region 35 for the main adhesion in which the second adhesive 33 is diffused. In the present invention, the fixing member 7 is positioned only in the X-axis direction and the Y-axis direction, and the fixing member 8 and the frame 7 are X bonded by temporary bonding to diffuse the first adhesive 32 in a slight gap. Positioning in the axial direction and the Y-axis direction is performed.
[0032]
The fixing member 8 is not particularly limited as long as the light-emitting element 4, 5 or the light-receiving element 6 can be mounted. Usually, the fixing member 8 includes an opening 42 in which the light-receiving element 4, 5 or the light-emitting element 6 is mounted. ing. On the left and right sides of the fixing member 8, U-shaped guides 43 for performing approximate positioning corresponding to positioning pins that may be provided on the frame 7 may be provided. The surface to be bonded of the fixing member 8 on the side to be bonded to the frame 7 is usually cut into a flat surface. The material of the fixing member 8 is not particularly limited as long as the light-emitting element 4 or 5 or the light-receiving element 6 can be mounted and the strength and the material can be bonded to the frame 7 by the first adhesive 32 and the second adhesive 33. A material such as ZDC (zinc die cast) or iron may be used.
[0033]
The frame 7 to which the fixing member 8 is bonded preferably has a bonded surface processed into a flat surface by cutting, and as a result, a minute gap can be formed between the fixing member 8 and the frame 7. . The material of the frame 7 is not particularly limited, and may be aluminum or an alloy thereof, for example.
[0034]
FIG. 4 is an example of a mode in which first adhesive diffusion preventing means is provided on the adherend surface of the fixing member.
[0035]
On the adherend surface 44 of the fixing member 8, a groove 41 is provided as a first adhesive diffusion preventing means. The grooves 41, 41 are provided to partition the regions 34, 34 to which the first adhesive 32 is applied. The contact surfaces on both sides of the fixing member 8 and the frame 7 are formed by the grooves 41. It is possible to prevent the first adhesive 32 applied from above from diffusing into the application region 35 of the second adhesive 33.
[0036]
The shape of the groove 41 is not particularly limited. For example, the groove 41 has various cross-sectional shapes such as a triangular shape, a semicircular shape, a semielliptical shape, a rectangular shape, and a trapezoidal shape as shown in FIGS. Can do. Such a shape is designed with or without the effect of stopping the diffusion of the first adhesive 32. For example, when a large amount of the first adhesive having a composition that easily diffuses is used for temporary bonding, the depth of the groove It is preferable that d and width w are large, and when the amount is small, the depth d and width w of the groove 41 may be small. It is selected in consideration of the type of adhesive and the coating amount.
[0037]
In addition to the groove 41, the first adhesive diffusion preventing means may have various cross-sectional shapes as shown in FIG. The cross-sectional shape shown in FIG. 6 shows a space structure 51 in which a gap formed between the fixing member 8 and the frame 7 is enlarged, and the space structure 51 diffuses the gap between the fixing member 8 and the frame 7. Further diffusion of the adhesive can be stopped.
[0038]
As shown in FIGS. 6A to 6C, the spatial structure 51 is preferably in a form in which the gap between the fixing member 8 and the frame 7 is enlarged. FIG. 6A shows a space structure 51 in which the gap between the fixing member 8 and the frame 7 is gradually enlarged by inclining the surface of the fixing member 8 at a predetermined angle, and the angle is not particularly limited. . Further, FIG. 6B shows a spatial structure 51 in which the gap between the fixing member 8 and the frame 7 is suddenly expanded by the surface of the fixing member 8 falling at a right angle, and FIG. The space structure 51 is shown in which the gap between the fixing member 8 and the frame 7 is rapidly expanded by the surface of the fixing member 8 falling at an acute angle at an angle exceeding 90 °.
[0039]
The detailed design of the spatial structure 51 is designed with or without the effect of stopping the diffusion of the first adhesive 32 as in the case of the groove 41 described above. For example, a large amount of the first adhesive having a composition that easily diffuses is used. In the case of temporary bonding, the gap between the fixing member 8 and the frame is desirably much larger than the gap between the first adhesive application areas. The gap can be enlarged to several hundred times the gap between the faces, or a large gap of several tens to several hundreds of micrometers can be formed. Also in the planar form, a linear shape as shown in FIG. 4, a curved shape, or a shape composed of a straight line and a curved line may be used.
[0040]
In the above, an example in which the groove 41 or the space structure 51 as the first adhesive diffusion preventing means is formed on the adherend surface 44 of the fixing member 8 is illustrated, but it is formed on the adherend surface 44 of the frame 7. Further, it may be formed on the adherend surfaces 44 and 44 of both the fixing member 8 and the frame 7. In the case where the fixing member 8 and the frame 7 are formed on the adherend surfaces, the shape, gap interval and angle as shown in FIGS. 4 and 6 may be used on both surfaces.
[0041]
The groove 41 and the space structure 51 may be formed when the fixing member 8 and / or the frame 7 are cast (cast), or may be formed by cutting the adherend surface.
[0042]
The first adhesive may be any adhesive as long as it is used for temporary adhesion, and the type thereof is not particularly limited. Moreover, the 2nd adhesive agent should just be normally used in order to carry out this adhesion | attachment, and the adhesive agent which can implement | achieve long-term stable adhesion is used. As the adhesive for temporary adhesion, an organic solvent-type low-viscosity adhesive that easily flows into the gap is preferably used, and examples thereof include a cyanoacrylate-based adhesive. Also, the adhesive for the main bonding is a low-viscosity adhesive that easily flows into the gap, and a type of adhesive that ensures long-term adhesion reliability is selected and used. For example, an organic solvent-type adhesive containing a resin component can be used, and examples thereof include an anaerobic adhesive.
[0043]
FIG. 7 is an example of a mode in which second adhesive diffusion preventing means for preventing diffusion of the second adhesive is provided. In the fixing member 8 of FIG. 7, the first spatial structure 61 that prevents the first adhesive from diffusing into the second adhesive application region 64, and the second adhesive diffuses outside the second adhesive application region. A second spatial structure 62 is provided to prevent this. In FIG. 7, the first space structure 61 and the second space structure 62 are exemplified by the triangular groove shape shown in FIGS. 4 and 5A. Reference numeral 63 denotes an area where the first adhesive is applied.
[0044]
In this aspect, since the first space structure 61 is provided on the adherend surface 44 of the fixing member 8, diffusion of the first adhesive is prevented in the space structure 61 and the second adhesive diffuses. Area 64 can be secured. Furthermore, since the second space structure 62 is provided on the adherend surface 44 of the fixing member 8, the second adhesive is prevented from diffusing into an extra area. As a result, the adhesive region of the second adhesive is secured, stable long-term reliability can be realized, and the second adhesive can be prevented from diffusing into the region where the second adhesive is not desired to be diffused. There is no adverse effect such as deterioration of characteristics. Also in this embodiment, the second adhesive diffusion preventing means may be provided on the frame 7 side, or may be provided on both the fixing member 8 and the frame 7.
[0045]
Note that the above-described extra area is an adverse effect that, for example, the second adhesive reaches the light-emitting elements 4 and 5 and the light-receiving element 6 attached to the fixing member 8 to deteriorate the characteristics of those elements. It is an area that will affect.
[0046]
FIG. 8 is a mode in which the first adhesive diffusion preventing means including the above-described spatial structure or groove is provided in a part of the fixing member. Since the first adhesive diffusion preventing means is provided to secure the application area 71 of the second adhesive, as long as the purpose is achieved, as shown in FIG. Can be provided.
[0047]
In FIG. 8, the first adhesive diffusion preventing means is formed with a predetermined length L from the upper side and the lower side of the fixing member 8. Since the formed first adhesive diffusion preventing means prevents the first adhesive from diffusing into the second adhesive application region 71, the second adhesive can be easily injected into the gap between the adherend surfaces. It can be carried out.
[0048]
【The invention's effect】
As described above, according to the optical pickup device of the present invention, when the fixing member and the frame are bonded, the first adhesive applied in advance does not diffuse into the application area of the second adhesive. The second adhesive application area is secured. As a result, stable adhesion with an adhesive becomes possible, and long-term reliability for positioning of the optical element can be ensured. Such an optical pickup device of the present invention is a stable and reliable optical pickup device in which the optical axis of the optical pickup device is not shifted over a long period of time.
[Brief description of the drawings]
FIG. 1 is an external view showing an example of an optical pickup device of the present invention.
FIG. 2 is an explanatory drawing showing an example of an optical element in the optical pickup device.
FIG. 3 is an explanatory diagram showing an example of a mode in which a fixing member is bonded and fixed to a frame.
FIG. 4 is an example of an aspect in which adhesive diffusion preventing means is provided on the adherend surface of the fixing member.
FIG. 5 is an example of various groove shapes.
FIG. 6 is an example of various spatial structures.
FIG. 7 is an example of an aspect provided with an adhesive diffusion preventing means for preventing the second adhesive from diffusing.
FIG. 8 is a mode in which adhesive diffusion preventing means is provided on a part of the fixing member.
FIG. 9 is an explanatory view showing a conventional bonding mode between a fixing member and a frame.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Optical pick-up apparatus 2 Objective lens drive device 3,86 Optical element 4,5 Light receiving element 6 Light emitting element 7,82 Frame 8,8a, 8b, 8c, 81 Fixing member 9 FPC board 11 Main shaft guide hole 12 Sub shaft guide groove 21 Half mirror 22 Prism 23 Objective lens 24 Sensor lens 31 Positioning jig 32 First adhesive 33 Second adhesive 34, 63 First adhesive application area 35, 64, 71 Second adhesive application area 41 Groove 42 Opening 43 U-shaped Guide 44 Adhered Surface 51 Spatial Structure 83, 85 Gap 84 Adhesive

Claims (4)

An objective lens driving device, an optical element having a light emitting element and a light receiving element, and one or both of the light emitting element and the light receiving element are accommodated or mounted via a fixing member for each element and the first adhesive and A frame that is positioned and bonded with a second adhesive;
The first adhesive diffusion prevention prevents the first adhesive from diffusing into the application area of the second adhesive on one or both of the frame-side surface of the fixing member and the surface of the frame on the fixing member side. Means for forming an optical pickup device. 2. The optical pickup device according to claim 1, wherein the first adhesive diffusion preventing unit has a spatial structure in which a gap between the fixing member and the frame is enlarged. 3. The optical pickup device according to claim 1, wherein the first adhesive diffusion preventing means is a groove. One or both of the fixing member and the frame is formed with second adhesive diffusion preventing means for preventing the second adhesive from diffusing outside the application area of the second adhesive. The optical pickup device according to claim 1.

Images