JP2002157772A - Holding mechanism of optical parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make mounting of optical parts accurate and easy and to make relative mispositioning between the optical parts less. SOLUTION: An optical pickup of an optical disk device having the optical pickup for reproducing and recording information from and to the optical disk has a pickup housing 15, a holding member 1 fixed to this pickup housing and the optical parts 10 fixed to this holding member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to CD, MD, DVD
The present invention relates to an improvement in an optical pickup used for a recording / reproducing apparatus for a disk-shaped recording medium such as a recording medium, and more particularly to an improvement in a mounting structure of an optical component to a pickup housing.

[0002]

2. Description of the Related Art An optical disk apparatus for projecting a laser beam onto a disk-shaped recording medium such as a CD, MD, or DVD to reproduce and record data on an upper side of the recording medium is a type of laser beam emitted from a laser light source. An optical pickup for projecting the spot onto a recording surface of a recording medium to perform reproduction and recording is provided. Recently, CD-ROM / DVD-RO
Optical pickups that are commonly used for M-compatible types, CD-R / RW / DVD-ROM compatible types, etc. are also on the market. Not only does the number of optical components constituting the optical pickup increase, but also the cost of individual components increases. Since accuracy is required, positioning accuracy when positioning the optical component on the pickup housing is an important factor in maintaining the performance of the optical pickup. The optical disk device includes an optical pickup as a reproducing / recording means inside a housing. The optical pickup includes an optical component support member called a pickup housing and various optical components mounted on the pickup housing. Japanese Patent Application Laid-Open No. Hei 8-221797 discloses an optical component mounting structure for an optical pickup, in which a base plate is bonded and fixed so as to close the opening of a box-shaped pickup housing having an opening on one surface. There is disclosed a configuration in which various optical components (such as a prism and a beam splitter) constituting an optical pickup are fixed to an inner surface of a base plate. The assembling procedure employs a method in which the optical component is fixed on the base plate, and then the base plate and the optical component are bonded and fixed to the opening of the pickup housing. However, in the above-mentioned conventional example, an ultraviolet-curable adhesive is used when the optical component is attached to the housing. However, when the adhesive is irradiated with the ultraviolet light, there is a problem that the ultraviolet light is hardly irradiated due to the structure of the housing. In addition, on the positioning housing reference surface, etc.
Although secondary processing is required, there is a problem that the processing is difficult due to the complicated shape of the housing. In addition, since the housing shape is complicated and it is difficult to simulate thermal expansion, when the optical component mounting span fluctuates due to linear expansion, deformation such as warpage is likely to occur in the housing. , It is difficult to reduce the relative angular position deviation.
In addition, when bonding the optical components to the housing, the structure of the housing is complicated, and it is difficult to bond a plurality of optical components at one time.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object of the present invention is to accurately and easily mount an optical component to a pickup housing, and to provide a relative position between the optical components. It is an object to reduce the displacement. A second object of the present invention is to easily and accurately attach a holding member (assembly) holding an optical component to a pickup housing. A third object of the present invention is to improve the mountability of an optical component assembly and improve the degree of freedom in design.
A fourth object of the present invention is to facilitate mounting of an optical component to a pickup housing and improve positioning accuracy of the optical component. A fifth object of the present invention is to improve the mounting reliability of the optical component by quantifying the amount and position of the adhesive when the optical component is mounted on the pickup housing with the adhesive. According to a sixth aspect of the present invention, when the optical component is held in the pickup housing, a positional shift of the optical component due to temperature and humidity is reduced by using a holding structure using an adhesive and a spring (elastic member). An object is to stabilize an output signal and improve reliability. The invention according to claim 7 is to reduce the weight of the optical component holding member by using the optical component mounting structure of the pickup housing as a skeleton structure,
It is another object of the present invention to make it easy to irradiate ultraviolet rays when mounting an optical component, and to improve reliability. Even if the optical component mounting span fluctuates due to the environmental temperature fluctuation and the linear expansion of the holding member, the holding member hardly warps due to the skeletal structure, and the relative angular displacement between the optical components can be reduced. is there. It is an object of the present invention to quantify an adhesive amount and a bonding position at the time of bonding an optical component and improve the mounting reliability of the optical component.

[0004]

According to an aspect of the present invention, there is provided an optical disk apparatus including an optical pickup for reproducing and recording information on an optical disk, wherein the optical pickup comprises: a pickup housing; A holding member fixed to the pickup housing; and an optical component fixed to the holding member. According to a second aspect of the present invention, a reference pin is provided on the holding member, a hole for fitting the reference pin is provided in the pickup housing, and the holding member is positioned with respect to the pickup housing by fitting the reference pin and the hole. It is characterized by the following. The invention according to claim 3 is characterized in that the holding member comprises one or a plurality of component holding pieces for adhesively holding an optical component. According to a fourth aspect of the present invention, the holding member includes one or more component holding pieces for adhesively holding the optical component, a base for integrally holding the component holding piece and having a positioning reference surface for the optical component, Characterized by comprising: The invention according to claim 5 is characterized in that a concave portion for filling with an adhesive is provided on a surface of the component holding piece for bonding and holding an optical component. The invention according to claim 6 is characterized in that the holding member is provided with an elastic pressing member that urges the optical component in a direction of pressing the optical component against the positioning reference surface of the holding member. The invention according to claim 7 is characterized in that the holding member has a skeletal structure, and has a structure in which an optical component is bonded and fixed to an appropriate position of the holding member. The invention according to claim 8 is characterized in that a concave portion for filling an adhesive is provided on the optical component bonding surface of the holding member having the skeletal structure.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. FIGS. 1A and 1B are views showing a configuration example in which a holding mechanism for an optical component according to an embodiment of the present invention is applied to a pickup housing of an optical pickup. (A) is a perspective view showing a configuration example of a holding member for an optical component, and (b) is a perspective view showing a state where the optical component is attached to the holding member. The holding member 1 for an optical component includes a flat holding member main body 2 and a plurality of (three in this example) component holding pieces 3 integrally projecting from one surface of the main body 2.
The holding member 1 is integrally formed of resin or the like. (B)
As shown in FIG. 1, the component holding piece 3 of this embodiment is a plate material having an arc-shaped notch 4 in a portion corresponding to the optical axis,
It is erected at a predetermined angle (in this example, a right angle). Each of the optical components 10 has a plate-like configuration in this example, and is adhered in a state where each optical component 10 is brought into close contact with the corresponding side surface (optical component mounting surface) 3 a of the component holding piece 3. Agents (eg, UV curable adhesives)
Adhesively fixed. Therefore, the corresponding component holding piece 3
By simply bonding the optical component 10 to the optical component 10, the work of adjusting the angle of the optical component 10 can be performed accurately and easily. By adopting such a simple structure in which the holding member 1 is exposed, it is also possible to perform secondary processing for improving the surface accuracy of the optical component mounting surface 3a of the holding member 1. Further, since the holding member 1 of the optical component has a simple shape, it can be formed of a material having low thermal expansion such as ceramic. A conventional pickup housing has a complicated structure and is difficult to mold with a material such as ceramic. The optical component 10 is generally adhered to an object to be fixed (component holding piece) using an ultraviolet curing adhesive, but the holding member 1 shown in FIG.
With this structure, it is easy to irradiate ultraviolet rays from a light source (not shown), and it is possible to uniformly irradiate and cure the adhesive portions of all optical components by one irradiation, and to irradiate a sufficient amount of ultraviolet rays. Therefore, the reliability after bonding can be improved. After the optical component 10 is bonded and fixed to the holding member 1, the assembly can be easily fixed to the pickup housing 15 with screws, bonded, or with a spring or the like, thereby reducing man-hours and improving reliability. .

Next, FIG. 2 is an exploded view for explaining the configuration of an optical component holding mechanism according to a second embodiment of the present invention, and the same parts as those in FIG. The characteristic structure of the optical component holding mechanism according to this embodiment is that a plurality of, for example, two reference pins 20 are integrally protruded at appropriate positions on the bottom surface of the main body 2 of the holding member 1, while the pickup housing is provided. Each of the reference pins 20 is attached to the plate-like base 16 on the 15 side.
A fitting hole 21 is provided at a position corresponding to
Is fitted in each fitting hole 21 so that the positioning of the holding member 1 with respect to the pickup housing 15 can be surely performed with high accuracy. With such a configuration, the holding member 1 can be accurately positioned on the pickup housing 15. In the embodiment of FIG. 2, for example, while the cross-sectional shape of one reference pin 20 and the shape of the corresponding fitting hole 21 are circular, the shape of the other reference pin 20 and the fitting 21 are changed. With the elongated hole, the extension of the holding member 1 due to linear expansion is absorbed by the housing 15. For this reason, the holding member 1
In this case, it is possible to effectively prevent the displacement of the optical component 10 due to the linear expansion and the deterioration of the performance of the optical pickup due to the displacement.

FIGS. 3 (a) and 3 (b) are an exploded perspective view showing the structure of an optical component according to another embodiment of the present invention and an explanatory view of an assembled state. The optical component holding mechanism according to this embodiment is characterized in that a plate-shaped optical component 26 is held using a plurality of holding members 25 having an opening 25a for an optical path. 2
The holding member 25 is sandwiched and held by the two holding members 25 so that the holding member 25 and the optical component 26 are integrated into a block shape, and this assembly is fixed to the pickup housing 15. The holding member 25 according to this embodiment includes two holding members 25A and 25B having different shapes.
A, 25B's inner surfaces 25A ', 25B' and outer surfaces 25A ', 25B'.
A ″ and 25B ″ are optical component mounting surfaces. As shown in (b), one side of the plate-shaped optical component 26 is adhered and fixed to each of the outer surfaces 25A "and 25B" of each holding member, while one is provided between the inner surfaces 25A 'and 25B'. With the optical component 26 sandwiched therebetween, it is bonded and fixed with an ultraviolet-curable adhesive or the like. The opening 25a provided in each holding member is formed at a position corresponding to the optical path. As described above, in the present embodiment, the plurality of optical components 26 are bonded and fixed to the plurality of holding members 25 having the optical path openings 25a to secure the relative position between the optical components. Since the assembly including the optical component 25 and the optical component 26 is configured to be fixed to the pickup housing 15, the relative position between the optical components can be ensured without the housing 15. Therefore, the mountability of the optical component assembly is improved, the size of the pickup housing can be easily reduced, and the degree of freedom in design is improved. Further, when all or a part of the holding member 25 is molded with a transparent member, for example, a plastic mold or the like, it becomes easy to irradiate the ultraviolet ray to the ultraviolet curable adhesive, and the working efficiency is improved.

FIGS. 4A and 4B are views showing an example of an optical component holding mechanism according to another embodiment of the present invention. The holding member 30 according to this embodiment has a plate shape. A plurality of block-shaped component holding pieces 32 of a required shape are provided on a base 31.
And a configuration in which a gap 33 for component holding (for positioning) is formed between opposed end faces 32 ′ of each component holding piece 32. In this example,
One of the three component holding pieces 32 has a triangular prism shape, the other has a trapezoidal column shape, and the other has a trapezoidal column shape. Each flat lower surface is fixedly integrated on the base 31, and an opening 32a is formed in a portion corresponding to the optical path. The gap 33 formed between the component holding pieces 32 is
Are formed between the opposite end surfaces of the optical component 35, and the accurate positioning and holding can be performed by sandwiching the optical component 35. In order to secure the fixing in the gap 33, bonding is usually performed by an adhesive. Further, another optical component 35 is bonded and fixed to the outer end surface 32 ″ of one component holding piece 32 located at one end. In this embodiment, the plurality of component holding pieces 32 are attached to the upper surface of the base 31 (positioning reference plane). By previously integrating the optical components in a predetermined positional relationship, the positioning and fixing are completed only by fitting the components 35 into the gaps 33 formed between the component holding pieces and bonding and fixing the components. By fixing the fixed structure (assembly) at a predetermined position of a pickup housing (not shown), accurate positioning of the optical components is completed, which facilitates the mounting of the optical components and improves the positioning accuracy of the optical components. Can be improved:
When attaching the optical component to the holding member 30, the workability is improved because an optical component positioning holding jig or the like is not required.

Next, an optical component holding mechanism according to the embodiment of FIG. 5 is a modified example of the embodiment of FIG. 4, and the first feature of this embodiment is that two opposing end surfaces 32 'are opposed to each other. In the case where a gap 33 for holding a component is formed therebetween, a holding portion 40 having an adhesive filling recess 40 at an appropriate position along the upper side of one end face and an outer end face 32 "for bonding an optical component are provided. In place along the upper side of the outer end surface 32 "of the member 32,
The point is that a similar recess 40 is provided. In this embodiment,
A recess 4 for filling with an adhesive is provided at a position where the holding piece contacts the optical component.
0, the adhesive is filled in the recess 40 and the end face and the component are bonded and fixed, so that the amount of the adhesive and the bonding position during the bonding operation can be quantified,
The mounting reliability of the optical component can be improved. Next, a second feature of the embodiment of FIG. 5 is that at least one projection 45 is provided at a suitable position on the upper surface of the holding piece 32 and an elastic pressing member 50 having a hole 51 fitted with the projection 45 is used. The point is that the optical components 35 bonded to the inside of the gap 33 and the outer end surface 32 ″ are pressed against the upper surface (the positioning reference surface) of the base 31. The elastic pressing member 50 is made of a leaf spring and has a hole 51. The plate-shaped main body 52 has two spring pieces 53 for pressing the optical component 35 held in each gap 33 onto the base 31, and the outer end face 3.
A spring piece 54 is formed for pressing the optical component 35 bonded to the 2 "against the end face. The spring piece 5 is tightly fitted and fixed in the hole 51 by the projection 45.
A pressing force of 3,54 is exhibited. According to this embodiment, in the optical component holding, by using the fixing using the adhesive and the holding structure using the elastic pressing member 50, the displacement of the optical component due to temperature and humidity can be reduced,
The output signal of the optical pickup can be stabilized, and the reliability can be improved.

Next, FIGS. 6A and 6B are a perspective view and an enlarged view of a main part showing a configuration of an optical component holding mechanism according to another embodiment of the present invention. In FIG. 6A, the optical component holding member 60 has a skeletal structure, a plate-shaped optical component is adhered and fixed to an adhesive surface inside and outside the skeletal structure, and the holding member 60 to which the optical component is fixed is fixed to the pickup housing. It has a configuration. The holding member 60 is provided between the four corners of the two opposingly disposed quadrangular frame members 61, respectively.
After forming the base frame by connecting them at 2, the square frames 63 and 64 for holding the optical components are formed at appropriate positions in the base frame at a required angle. In this example, one side 6 of each of the frame bodies 63 and 64
The reference numerals 3a and 64a and the outer surface 61a of the frame body 61 are optical component holding surfaces, and the plate-shaped optical component is fixed to each optical component holding surface with an adhesive. In this embodiment, the optical component holding member 60 has a skeletal structure, which reduces the weight of the optical component holding member, facilitates the irradiation of ultraviolet rays to the ultraviolet curable adhesive used when mounting the optical component, and improves the reliability. Can be planned. Further, even if the environmental temperature fluctuates and the optical component mounting span fluctuates due to the linear expansion of the holding member, warpage of the holding member hardly occurs due to the skeletal structure, and the relative angular displacement between the optical components can be reduced. (B) is a modification of (a),
A concave portion 65 for filling the adhesive is formed at an appropriate position on at least one side of the optical component holding surfaces 63a, 64a and / or 61a, thereby realizing quantification of the amount of the adhesive and determination of the bonding position. In the above-described embodiment, the case where the optical component holding mechanism is mainly applied to the optical pickup has been described. However, this is merely an example, and the present invention can be applied to an optical component holding structure in any optical device. Further, the optical components to be held are not limited to plate-shaped components, and can be applied to cases where various types of components are held.

[0011]

As described above, according to the first aspect of the present invention, the optical component holding member is provided with a mechanism for positioning and supporting the optical component, and the optical component is fixed to the holding member.
Since it is fixed to the pickup housing, it is possible to accurately and easily mount optical components.
The relative displacement between the optical components can be reduced.
According to the second aspect of the present invention, a reference pin is provided on the holding member, and the reference pin is fitted into a hole provided on the pickup housing side, thereby positioning the two. The optical component assembly can be easily and accurately attached to the housing. According to the third aspect of the present invention, an assembly for positioning and holding an optical component is formed by using a plurality of block-shaped component holding pieces provided with an opening for an optical path, and this assembly is attached to a pickup housing. It is possible to improve the attachment of parts and the degree of freedom in design. Since the degree of freedom in design can be improved, it is possible to reduce the size of the pickup housing without difficulty. According to the fourth aspect of the present invention, a block-shaped component holding piece is preliminarily positioned and fixed on a base having a reference surface, and an optical component is assembled to the holding member. Since the optical components are fixed, the mounting of the optical components is facilitated, and the positioning accuracy of the optical components can be improved. According to the fifth aspect of the present invention, the concave portion for filling the adhesive is provided at an appropriate position on the component mounting surface of the holding member, so that the amount and position of the adhesive can be quantified when the optical component is bonded and attached, and the mounting reliability of the optical component is improved. Can be achieved. According to the sixth aspect of the present invention, since the elastic member that presses the optical component bonded and held by the holding member toward the reference surface of the base is used, the displacement of the optical component due to temperature and humidity can be reduced, and the output signal of the pickup can be reduced. Stabilization can be achieved, and reliability can be improved. According to a seventh aspect of the present invention, the holding member having the optical component mounting structure is a skeletal structure.
It is possible to reduce the weight of the optical component holding member, facilitate irradiation of ultraviolet rays when mounting the optical component, and improve reliability. Also, even if the environmental temperature fluctuates and the optical component mounting span fluctuates due to linear expansion of the holding member,
Due to the skeletal structure, the holding member is less likely to warp, and the relative angular displacement between the optical components can be reduced. Claim 8
According to the invention, when the optical component is attached to the holding member having the skeletal structure by bonding, the amount of the adhesive and the bonding position can be quantified, and the mounting reliability of the optical component can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration example in which an optical component holding mechanism according to an embodiment of the present invention is applied to a pickup housing of an optical pickup. FIG. 1A illustrates a configuration example of an optical component holding member. FIG. 3B is a perspective view illustrating a state where an optical component is attached to the holding member.

FIG. 2 is an exploded view illustrating a configuration of an optical component holding mechanism according to a second embodiment of the present invention.

FIGS. 3A and 3B are an exploded perspective view showing a configuration of an optical component according to another embodiment of the present invention, and an explanatory diagram of an assembled state.

FIGS. 4A and 4B are views showing an example of an optical component holding mechanism according to another embodiment of the present invention.

FIG. 5 is a configuration explanatory view of a holding mechanism according to a modified embodiment of FIG. 4;

FIGS. 6A and 6B are explanatory diagrams illustrating a configuration of a holding mechanism according to another embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Holding member, 2 holding member main body, 3 component holding pieces, 3
a side surface (optical component mounting surface), 4 notch, 10 optical component, 15 pickup housing, 16 plate base, 20 reference pin, 21 fitting hole, 25, 25A, 2
5B holding member, 25A ', 25B' inner surface, 25
A ", 25B" outer surface, 25a opening, 26 optical parts, 30 holding member, 31 base, 32 parts holding piece, 33 gap, 35 optical parts, 40 recess, 5
0 elastic holding member, 51 hole, 60 holding member, 61
Frame, 62 bar, 63, 64 Frame, 65 recess.

Claims (8)

[Claims] 1. An optical disk device comprising an optical pickup for reproducing and recording information on an optical disk, wherein the optical pickup is a pickup housing, a holding member fixed to the pickup housing, and fixed to the holding member. An optical component holding mechanism, comprising: an optical component. 2. The method according to claim 1, wherein a reference pin is provided on the holding member, a hole is provided in the pickup housing for fitting the reference pin, and the holding member is positioned relative to the pickup housing by fitting the reference pin and the hole. The optical component holding mechanism according to claim 1, wherein: 3. The optical component holding mechanism according to claim 1, wherein the holding member includes one or a plurality of component holding pieces for adhesively holding the optical component. 4. The holding member comprises one or a plurality of component holding pieces for adhesively holding an optical component, and a base integrally holding the component holding piece and having a positioning reference surface for the optical component. The holding mechanism for an optical component according to claim 1, wherein: 5. The optical component holding device according to claim 3, wherein a concave portion for filling with an adhesive is provided on a surface of the component holding piece for bonding and holding the optical component. mechanism. 6. The holding member according to claim 4, wherein an elastic pressing member that urges the optical component in a direction of pressing the optical component against a positioning reference surface of the holding member is provided on the holding member. Optical component holding mechanism. 7. The optical component holding mechanism according to claim 1, wherein the holding member has a skeletal structure, and has a structure in which an optical component is bonded and fixed to an appropriate position of the holding member. 8. The holding structure for an optical component according to claim 1, wherein a recess for filling an adhesive is provided on the optical component bonding surface of the holding member having the skeleton structure.