JP2012038381A - Optical pickup device, manufacturing method thereof, and electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical pickup device, a manufacturing method thereof, and electronic equipment that can prevent bearing components from coming out of attachment holes and minimize an increase in manufacturing cost.SOLUTION: An optical pickup device 2 includes an object lens mounting portion 21, a base portion 22, bearing components 23, and bearing component holding portions 24. An objective lens 29 is mounted on the objective lens mounting portion 21. The objective lens mounting portion 21 is fixed to the base portion 22. A first guide shaft 11 for supporting the base portion 22 is inserted through the bearing components 23, and the bearing components 23 are formed into a cylindrical shape. The bearing component holding portions 24 are formed in continuous with a side portion of the base portion 22 and have attachment holes 31 to which the bearing components 23 are attached. One ends of the bearing component holding portions 24 have projections 36 projecting inward in a radial direction from inner peripheral surfaces of the attachment holes 31.

Description

  The present invention relates to an optical pickup device that records or reproduces information on an optical recording medium, a manufacturing method thereof, and an electronic apparatus.

  FIG. 12 is a plan view of the optical disc drive apparatus 101 according to the first prior art. The optical disc drive apparatus 101 is used for recording and / or reproducing information with respect to an optical disc.

  The optical disk drive device 101 includes an optical pickup device 102 and a guide shaft 103. The optical pickup device 102 includes a base portion 105 serving as a base of the optical pickup device 102, a light source element 106 that emits a light beam, an objective lens 107 that focuses the light beam on the recording surface of the optical disk, and a recording surface. And a light receiving element 108 for receiving the reflected light beam. The base portion 105 has a mounting hole 109 into which the guide shaft 103 is inserted at the end in the longitudinal direction. The guide shaft 103 supports the optical pickup device 102 so as to be movable along the radial direction of the optical disk.

  The optical disk drive device 101 moves the optical pickup device 102 in the radial direction of the optical disk, and writes or reads information on the recording surface of the optical disk by the moved optical pickup device 102.

  FIG. 13 is a partial cross-sectional view of the optical disc drive apparatus 101 shown in FIG. 12 cut along a cutting plane line XIII-XIII. A bearing component 110 such as metal is mounted in the mounting hole 109. The bearing component 110 is formed in a cylindrical shape, is press-fitted into the mounting hole 109, and is held by the base portion 105. The guide shaft 103 is inserted into the bearing component 110 and supports the base portion 105 via the bearing component 110.

  For example, plastic parts, zinc die cast, aluminum die cast, and magnesium die cast are used as the base portion 105, and among these, zinc die cast may be used from the viewpoint of heat dissipation effect and manufacturing cost. Many. Zinc die-casting is inferior in creep strength as a material characteristic. Creep is a deformation that occurs after a certain period of time when a material subjected to a constant temperature and a constant stress, and is generated by heat in metals such as zinc die casts.

The zinc alloy magneto-optical pickup component according to the second prior art is a zinc alloy that does not contain aluminum, and has a creep rate of 1.5 × 10 ⁻⁴ % / hour or less at 100 ° C. and 25 MPa. It is manufactured from a zinc alloy having a dimensional change rate of up to 1000% at 1000 ° C. within ± 0.01%. This zinc alloy-made magneto-optical pickup component is excellent in creep resistance and aging change characteristics (see, for example, Patent Document 1).

JP 2001-35031 A

  The optical disk drive device 101 according to the first prior art may be heated to 75 to 85 ° C. during the manufacture of the base portion 105, for example, in an adhesive distortion removing process after bonding optical components. When creep occurs in the zinc die cast by this heating, the base part 105 has a problem that the force for holding the press-fitted bearing part 110 is weakened and the bearing part 110 may come out of the mounting hole 109.

  In addition, the zinc alloy magneto-optical pickup component according to the second prior art can improve the creep resistance by changing the composition of the zinc die-cast, but the management of the composition is difficult and the manufacturing cost increases. There is a problem of doing.

  The objective of this invention is providing the optical pick-up apparatus which can prevent that bearing components remove | deviate from a mounting hole, and can suppress the increase in manufacturing cost, its manufacturing method, and an electronic device.

The present invention is an optical pickup device for recording and / or reproducing information by irradiating light onto a recording surface of an optical recording medium,
An objective lens mounting portion on which an objective lens that focuses light on the recording surface of the optical recording medium is mounted;
A base portion to which the objective lens mounting portion is fixed;
A guide shaft for supporting the base portion is inserted, and a bearing part formed in a cylindrical shape,
A bearing part holding part formed continuously to the side part of the base part and having a mounting hole in which the bearing part is mounted, and protrudes radially inward from the inner peripheral surface of the mounting hole at one end part An optical pickup device including a bearing part holding portion provided with a portion.

Further, in the present invention, an annular protrusion is formed at one end of the bearing part holding part,
The protruding portion is formed of at least a part of the protrusion.

In the present invention, one or more protrusions are formed on one end of the bearing component holding portion,
The protruding portion is formed of at least a part of the one or more protrusions.

The present invention is characterized in that a thin-walled portion is formed at one end of the bearing component.
In the invention, it is preferable that the other end portion of the bearing component holding portion is provided with a convex portion protruding radially inward from the inner peripheral surface of the mounting hole.

The present invention is also a method for manufacturing the optical pickup device,
A bearing component press-fitting step of applying pressure to the bearing component by a bearing component press-fitting jig for press-fitting the bearing component into the mounting hole of the bearing component holding portion, and press-fitting the bearing component from one end side of the mounting hole;
In the bearing component press-fitting step, when the bearing component is press-fitted from one end side of the mounting hole and the one end portion of the bearing component passes through one end portion of the mounting hole, the bearing component press-fitting jig And a protruding portion forming step of forming the protruding portion by applying pressure to the one end portion and deforming at least a part of the one end portion of the mounting hole.
According to another aspect of the invention, there is provided an electronic apparatus comprising the optical pickup device.

  According to the present invention, the optical pickup device records and / or reproduces information by irradiating the recording surface of the optical recording medium with light. The optical pickup device includes an objective lens mounting part, a base part, a bearing part, and a bearing part holding part. The objective lens mounting portion is mounted with an objective lens that focuses the laser beam on the recording surface of the optical recording medium. The objective lens mounting portion is fixed to the base portion. The bearing component is formed in a cylindrical shape through which a guide shaft for supporting the base portion is inserted. The bearing part holding part is formed continuously with the side part of the base part and has a mounting hole in which the bearing part is mounted. The bearing component holding portion is provided with a protruding portion that protrudes radially inward from the inner peripheral surface of the mounting hole at one end.

  As a result, the optical pickup device can prevent the bearing component from slipping out of the one end side of the mounting hole by the protruding portion. Therefore, the bearing part holding part can hold the bearing part. Thereby, the base part can be reliably supported by the guide shaft via the bearing part and the bearing part holding part. Therefore, the optical pickup device can accurately move in a predetermined direction, for example, the radial direction of the optical recording medium, by guide by the guide shaft, and can record and reproduce information with high accuracy.

  In addition, the optical pickup device can prevent the bearing component from slipping out from the one end portion side of the mounting hole with a simple configuration in which the projecting portion is provided at one end portion of the mounting hole, thereby suppressing an increase in manufacturing cost. be able to.

  According to the present invention, an annular protrusion is formed at one end of the bearing component holding portion. The protruding portion is composed of at least a part of the protrusion.

  As a result, since the protrusion is uniformly formed in the annular shape in the bearing component holding portion, the protrusion can be deformed to form the protrusion by applying a uniform pressure to the entire protrusion. The bearing part holding part can also form the protruding part by deforming only a part of the annular projection at equal intervals in the circumferential direction. Therefore, when the protrusion is deformed to form the protruding portion, it is possible to suppress the occurrence of the displacement of the bearing component with respect to the bearing component holding portion.

  According to the present invention, one or more protrusions are formed at one end of the bearing component holding portion. The protruding portion is composed of at least a part of one or a plurality of protrusions.

  As a result, since the projection is formed on a part of the peripheral portion of the mounting hole, the bearing component holding portion is provided when the projection is deformed and the projection is formed as compared with the case where the projection is formed in an annular shape. Pressure to be reduced. Therefore, when the protrusion is deformed to form the protruding portion, it is possible to suppress the occurrence of the positional deviation of the bearing component with respect to the bearing component holding portion due to the application of pressure.

  Moreover, according to this invention, a thin part is formed in the one end part of a bearing component. Thereby, since the thin wall portion is formed at one end portion of the bearing component, it can be engaged with the protruding portion formed at one end portion of the bearing component holding portion. Therefore, the thin portion can enhance the effect of preventing the bearing component from slipping out from the one end portion side of the mounting hole.

  According to the invention, the other end portion of the bearing component holding portion is provided with a convex portion protruding radially inward from the inner peripheral surface of the mounting hole. Thereby, the optical pickup device can prevent the bearing component from coming out not only from one end side of the mounting hole but also from the other end side by the convex portion. Therefore, the bearing component holding portion can reliably hold the bearing component.

  According to the invention, the method for manufacturing an optical pickup device is a method for manufacturing the optical pickup device, and includes a bearing component press-fitting step and a protruding portion forming step. In the bearing component press-fitting step, pressure is applied to the bearing component by a bearing component press-fitting jig for press-fitting the bearing component into the mounting hole of the bearing component holding portion, and the bearing component is press-fitted from one end side of the mounting hole. In the bearing part press-fitting process, when the bearing part is press-fitted from one end side of the mounting hole, and one end part of the bearing part passes through one end part of the mounting hole, one end of the mounting hole is formed by the bearing part press-fitting jig in the protrusion forming process. A pressure is applied to the part to deform at least a part of one end of the mounting hole to form a protrusion.

  Thus, in the method of manufacturing the optical pickup device, the bearing component press-fitting step and the protrusion forming step can be processed in a series of flows by the bearing component press-fitting jig. Therefore, in the manufacturing method of the optical pickup device, the protruding portion can be formed while suppressing an increase in processing time and work load in each process. Thus, in the method of manufacturing the optical pickup device, the optical pickup device that can prevent the bearing component from coming off from the one end portion side of the mounting hole by the protruding portion can be easily manufactured in a short time, and the manufacturing cost can be reduced. The increase can be suppressed.

  According to the invention, an electronic apparatus includes the optical pickup device. As a result, the optical pickup device can prevent the bearing component from slipping out of the one end side of the mounting hole by the protruding portion. Therefore, the bearing part holding part can hold the bearing part. Thereby, the base part can be reliably supported by the guide shaft via the bearing part and the bearing part holding part. Therefore, the optical pickup device can be accurately moved in a predetermined direction, for example, the radial direction of the optical recording medium, by guidance by the guide shaft. As a result, an electronic device including the optical pickup device can record and reproduce information with high accuracy.

1 is a plan view of an optical disc drive device 1 according to a first embodiment of the present invention. It is a figure which shows the optical pick-up apparatus 2 which concerns on 1st Embodiment of this invention. It is sectional drawing which cut | disconnected the bearing component holding | maintenance part 24 of the optical pick-up apparatus 2 shown in FIG. 2 by the cut surface line III-III. 4 is a flowchart illustrating a method for manufacturing the optical pickup device 2. 6 is a cross-sectional view showing transition of the optical pickup device 2 in the method for manufacturing the optical pickup device 2. FIG. It is the figure which looked at the bearing component holding | maintenance part 24 and the bearing component 23 in the preparation process from the one end side of the mounting hole 31. FIG. It is the figure which looked at the bearing component holding | maintenance part 24 and the bearing component 23 of the optical pick-up apparatus 111 of the comparative example from the one end side of the mounting hole 31. FIG. It is sectional drawing which shows the transition of the optical pick-up apparatus 111 in the manufacturing method of the optical pick-up apparatus 111 of a comparative example. It is the figure which looked at the bearing component holding | maintenance part 24 and the bearing component 23 of the optical pick-up apparatus 2 which concern on 2nd Embodiment of this invention from the one end side of the mounting hole 31. FIG. It is sectional drawing which shows the transition of the optical pick-up apparatus 2 in the manufacturing method of the optical pick-up apparatus 2 which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows the bearing component holding | maintenance part 24 and the bearing component 23 of the optical pick-up apparatus 2 which concern on 4th Embodiment of this invention. 1 is a plan view of an optical disc drive apparatus 101 according to a first conventional technique. It is the fragmentary sectional view which cut | disconnected the optical disk drive device 101 shown in FIG. 12 by the cutting plane line XIII-XIII.

(First embodiment)
FIG. 1 is a plan view of an optical disc drive apparatus 1 according to the first embodiment of the present invention. In FIG. 1, the left-right direction is the tangential direction X, the up-down direction is the tracking direction Y, and the direction perpendicular to the paper surface is the focusing direction Z. Hereinafter, the tangential direction X is also simply referred to as “X direction”, the tracking direction Y is also simply referred to as “Y direction”, and the focusing direction Z is also simply referred to as “Z direction”.

  The optical disk drive device 1 includes an optical pickup device 2, a first guide shaft 11, a second guide shaft 12, a base chassis 13, and a disk drive unit 14. The optical disc drive apparatus 1 performs at least one of recording and reproduction of information on an optical recording medium such as a compact disc (abbreviation “CD”) and a digital versatile disc (abbreviation “DVD”). It is an electronic device used for performing any one of them.

  The optical pickup device 2 performs at least one of recording and reproduction by irradiating a laser beam to an optical disk 20 that is an optical recording medium on which a recording surface is formed. The first guide shaft 11 and the second guide shaft 12 support the optical pickup device 2 movably along the radial direction of the optical disk 20. The base chassis 13 constitutes the main body of the disk drive device. The disk drive unit 14 includes a turntable 16 and rotationally drives the optical disk 20 mounted on the turntable 16.

  The optical disk drive 1 mounts an optical disk 20 on a turntable 16 attached to a rotating shaft 17 of a spindle motor (not shown), and rotates the optical disk. The optical pickup device 2 transmits laser light to the recording surface of the optical disk 20. Irradiating.

  The optical pickup device 2 is guided in the radial direction by the first guide shaft 11 and the second guide shaft 12. The disk drive device moves the optical pickup device 2 radially from the center of the optical disk 20 toward the outer periphery, and writes or reads information on the recording surface by the moved optical pickup device 2.

  FIG. 2 is a diagram showing the optical pickup device 2 according to the first embodiment of the present invention. 2A is a plan view showing the optical pickup device 2, FIG. 2B is a right side view showing the optical pickup device 2, and FIG. 2C shows the optical pickup device 2. It is a front view.

  The optical pickup device 2 includes an objective lens mounting part 21, a base part 22, a bearing part 23, a bearing part holding part 24, a guide shaft holding part 28, a light source element 26, a light receiving element 27, and a lens (not shown). A drive unit and a pickup drive unit (not shown) are included. The bearing component 23 may be referred to as a bearing metal or a metal.

  The objective lens mounting unit 21 is mounted with an objective lens 29 that condenses laser light on the recording surface of the optical disk 20. The base portion 22 is a base of the optical pickup device 2 and the objective lens mounting portion 21 is fixed. Further, a light source element 26 and a light receiving element 27 are arranged on the base portion 22.

  The base portion 22 is formed by zinc die casting. In other embodiments, the base portion 22 may be formed by plastic parts, aluminum die cast, magnesium die cast, or the like.

  The bearing component 23 is formed in a cylindrical shape, and an insertion hole 32 is formed in the X direction. The insertion hole 32 has an inner diameter slightly larger than the outer diameter of the first guide shaft 11. In the bearing component 23, the first guide shaft 11 for supporting the base portion 22 is inserted through the insertion hole 32.

  The bearing component 23 is formed of a porous body that holds a lubricant. This porous body is formed by, for example, blending about 10% of tin containing copper as a main component and further blending other components. In the state where the first guide shaft 11 is inserted through the insertion hole 32, the bearing component 23 is smoothly slid in the axial direction X by the lubricant.

  The bearing component holding part 24 is formed continuously to the side part of the base part 22, that is, one end part in the Y direction which is the longitudinal direction. The bearing component holding part 24 has a mounting hole 31 in which the bearing component 23 is mounted. In the present embodiment, the two bearing component holding portions 24 are formed with an interval in the X direction.

  The guide shaft holding portion 28 is formed continuously to the side portion of the base portion 22, that is, the other end portion in the longitudinal direction Y. The guide shaft holding portion 28 holds the second guide shaft 12 so as to be slidable in the X direction. The guide shaft holding part 28 has two holding pieces 30 and each holding piece 30 holds the second guide shaft 12 in the Z direction. In the present embodiment, one guide shaft holding portion 28 is formed on the base portion 22, but in other embodiments, a plurality of guide shaft holding portions 28 are formed on the other end portion in the longitudinal direction Y of the base portion 22. May be.

  The first guide shaft 11 and the second guide shaft 12 support the optical pickup device 2 so as to be movable in the radial direction of the optical disk 20. The first guide shaft 11 and the second guide shaft 12 are formed in a rod shape, and are arranged with the axis line directed in the X direction. The first guide shaft 11 has an outer diameter slightly smaller than the inner diameter of the insertion hole 32. The bearing component 23 is mounted in the mounting hole 31 of the bearing component holding portion 24 and is held by the bearing component holding portion 24. The first guide shaft 11 supports the base portion 22 via the bearing component 23.

  The objective lens 29 is disposed on the upper surface side of the base portion 22 and focuses the light beam on the recording surface of the optical disk 20. The light source element 26 emits a light beam such as a laser beam. The light receiving element 27 receives a return light beam reflected from the recording surface of the optical disk 20 and detects a signal. The lens driving unit drives the objective lens 29 in the focusing direction Z and the tracking direction Y of the optical disk 20.

  The optical pickup device 2 is moved along the X direction which is the radial direction of the optical disk 20 by the pickup driving unit while being supported by the first guide shaft 11 and the second guide shaft 12.

  FIG. 3 is a cross-sectional view of the bearing component holding portion 24 of the optical pickup device 2 shown in FIG. 2 cut along a cutting plane line III-III. In FIG. 3, the first guide shaft 11 is omitted. The bearing component holding portion 24 is located radially inward from the inner peripheral surface of the mounting hole 31 at one end portion in the X direction that is the axial direction of the mounting hole 31 in a state where the bearing component 23 is mounted in the mounting hole 31. It has the protrusion part 36 which protrudes.

  The bearing component holding part 24 has a protrusion 37, and the protrusion 37 is formed in an annular shape around the mounting hole 31 as viewed in the axial direction X of the mounting hole 31, and protrudes in the axial direction X. The protrusion 37 is formed in a rib shape on the periphery of the mounting hole 31. The protrusion 37 is formed by punching in the same direction when the mounting hole 31 is molded. The protruding portion 36 includes at least a part of the protrusion 37.

  The inner diameter D1 of the mounting hole 31 is slightly smaller than the outer diameter D2 of the bearing component 23, and is formed to be, for example, 4.000 mm. The outer diameter D2 of the bearing component 23 is formed to be slightly larger than the inner diameter D1 of the mounting hole 31, for example, 4.010 mm. Since the inner diameter D <b> 1 of the mounting hole 31 is slightly smaller than the outer diameter D <b> 2 of the bearing part 23, the bearing part 23 is held in the mounting hole 31 when the bearing part 23 is press-fitted into the mounting hole 31.

  An inner diameter D3 of the projecting portion 36 is formed smaller than the inner diameter D1 of the mounting hole 31 and the outer diameter D2 of the bearing component 23, and is formed to be 3.990 mm, for example. The inner diameter of the bearing component 23 is slightly larger than the outer diameter of the first guide shaft 11.

  At both ends in the axial direction X of the bearing component 23, first chamfered portions 39 are formed on the inner side and the outer side in the radial direction. The first chamfered portion 39 is chamfered at a first angle that the end portion is predetermined to define a first C (Chamfer) surface. Specifically, the first chamfered portion 39 includes an angle formed between one end surface in the axial direction X of the bearing component 23 and the outer peripheral surface of the bearing component 23, and one end surface in the axial direction X of the bearing component 23 and the inside of the bearing component 23. The angle formed by the peripheral surface, the angle formed by the other end surface in the axial direction X of the bearing component 23 and the outer peripheral surface of the bearing component 23, and the other end surface in the axial direction X of the bearing component 23 and the inner peripheral surface of the bearing component 23. The formed angle is chamfered so as to be a first predetermined angle, for example, about 45 °.

  Of the four first chamfered portions 39 formed on the bearing component 23, the first chamfered portion 39 formed on the outer side in the radial direction at one end portion in the axial direction X of the bearing component 23 is prevented from being removed. Also called.

  FIG. 4 is a flowchart showing a method for manufacturing the optical pickup device 2. FIG. 5 is a cross-sectional view showing the transition of the optical pickup device 2 in the method for manufacturing the optical pickup device 2. FIG. 6 is a view of the bearing component holding part 24 and the bearing component 23 in the preparation process as viewed from one end side of the mounting hole 31.

  The manufacturing method of the optical pickup device 2 is a method of manufacturing the optical pickup device 2, and includes a preparation step, a bearing component press-fitting step, and a protruding portion forming step. When the bearing part 23 is press-fitted into the bearing part holding part 24, the process proceeds to step S0 and the process is started.

  As shown in FIG. 5, the bearing component press-fitting jig 41 includes a press-fit guide portion 42 and a pressure applying portion 43. The press-fit guide portion 42 is formed in a columnar shape, and has an outer diameter slightly smaller than the inner diameter D3 of the bearing component 23. The pressure applying part 43 is formed in a columnar shape and has an outer diameter larger than the outer diameter of the press-fit guide part 42. The press-fit guide part 42 and the pressure applying part 43 are disposed on the same axis.

  An annular groove is formed at the other end in the axial direction X of the pressure applying portion 43 at a position facing the protrusion 37 of the bearing component holding portion 24. The groove portion has a cylindrical first inner peripheral surface, an annular second inner peripheral surface, and a frustoconical third inner peripheral surface. The depth of the groove, that is, the dimension in the X direction is formed smaller than the dimension of the protrusion 37 in the X direction.

  The first inner peripheral surface is formed at the innermost radial direction. The diameter of the first inner peripheral surface is larger than the inner diameter of the bearing component 23 and smaller than the outer diameter of the bearing component 23. The second inner peripheral surface is connected to the first inner peripheral surface and is formed radially outward from the first inner peripheral surface.

  The third inner peripheral surface is continuous with the second inner peripheral surface and is formed radially outward from the second inner peripheral surface. The third inner peripheral surface is inclined outward in the radial direction from one end side in the axial direction X toward the other end side. As for the diameter of the third inner peripheral surface, one end portion in the X direction is formed smaller than the outer diameter of the protrusion 37, and the other end portion in the X direction is formed slightly larger than the outer diameter of the protrusion 37.

  In step S <b> 1, which is a preparation process, the bearing part holding part 24 is arranged so that the axis of the press-fit guide part 42 and the axis of the mounting hole 31 coincide with each other. As shown in FIG. 6, the bearing component 23 is arranged on one end side in the axial direction X of the mounting hole 31 in a state in which the axes are aligned. Next, the bearing part press-fitting jig 41 is moved in the axial direction X, the bearing part press-fitting jig 41 is brought close to the bearing part holding part 24, and the press-fitting guide part 42 is inserted into the insertion hole 32 of the bearing part 23.

  In step S2, which is a bearing component press-fitting process, pressure is applied to the bearing component 23 by the bearing component press-fitting jig 41 for press-fitting the bearing component 23 into the mounting hole 31 of the bearing component holding portion 24, and the bearing component 23 is mounted. The hole 31 is press-fitted from one end side in the axial direction X.

  FIG. 5A is a cross-sectional view showing the state of the bearing component press-fitting jig 41, the bearing component holding portion 24, and the bearing component 23 in step S2. A part of the other end side in the axial direction X of the bearing component 23 is inserted into the mounting hole 31.

  A second chamfered portion 40 is formed at one end in the axial direction X of the protrusion 37 on the inner side in the radial direction. The second chamfered portion 40 is chamfered at a predetermined second angle to define a second C surface. Specifically, the second chamfered portion 40 is configured such that an angle formed by one end surface of the projection 37 in the axial direction X and the inner peripheral surface of the mounting hole 31 is a predetermined second angle, for example, about 45 °. It is formed by chamfering.

  In the alignment with respect to the mounting hole 31 of the bearing component 23 in step S1, the second chamfered portion 40 of the bearing component holding portion 24 and the first chamfered portion 39 of the bearing component 23 are aligned in the direction perpendicular to the axial direction X. Deviation can be allowed.

  In step S <b> 2, the bearing component press-fitting jig 41 presses the bearing component 23 to press-fit the bearing component 23 into the bearing component holding portion 24. In step S2, the bearing component press-fitting jig 41 applies a predetermined pressure to the bearing component 23, for example, a pressure of 5 kgf or more.

  In step S2, when the bearing part 23 is press-fitted from one end side of the mounting hole 31 and one end part in the axial direction X of the bearing part 23 passes through one end part of the mounting hole 31, in step S3 which is a protrusion forming process. Then, pressure is applied to one end portion of the mounting hole 31 by the bearing part press-fitting jig 41, and at least a part of the one end portion of the mounting hole 31 is deformed to form the protruding portion 36.

  FIG. 5B is a cross-sectional view showing the state of the bearing component press-fitting jig 41, the bearing component holding portion 24, and the bearing component 23 in step S3. A pressure is applied to the protrusion 37 by the pressure applying portion 43 of the bearing component press-fitting jig 41, and caulking is performed. The protrusion 37 is caulked by the groove and is deformed radially inward to form the protrusion 36. The removal preventing chamfered portion 46 has an effect of facilitating the deformation of the protrusion 37 inward in the radial direction by being positioned inward of the protrusion 37 in the radial direction.

  In step S <b> 3, the bearing part press-fitting jig 41 presses the bearing part 23 to press-fit the bearing part 23 into the bearing part holding part 24, and the bearing part press-fitting jig 41 presses the protrusion 37, and the protrusion 36. Is formed. In step S3, the bearing component press-fitting jig 41 applies a predetermined pressure, for example, a pressure of 5 kgf or more, to the bearing component 23 and the protrusion 37.

  When the formation of the protruding portion 36 is completed, the bearing component press-fitting jig 41 is moved away from the bearing component holding portion 24 and the bearing component 23, and the press-fitting guide portion 42 is pulled out from the insertion hole 32, and the process proceeds to step S4. Proceed and the process ends.

  FIG. 5C is a cross-sectional view showing the state of the bearing component holding portion 24 and the bearing component 23 after the processing in step S3 is completed. FIG. 5D is an enlarged cross-sectional view of the protrusion 37 of the bearing component holding portion 24 shown in FIG.

  Since the bearing component 23 is press-fitted from one end side in the axial direction X of the mounting hole 31, the inner peripheral surface of the mounting hole 31 is slightly expanded radially outward on one end side of the mounting hole 31. Since the projecting portion 36 is formed on one end side in the axial direction X of the bearing 31, the bearing component 23 can be prevented from slipping out from the one end side of the mounting hole 31.

  Although the protruding portion 36 is not formed on the other end side in the axial direction X of the mounting hole 31, the bearing component 23 is not press-fitted from the other end side of the mounting hole 31. Getting out of the side usually doesn't happen.

(Comparative example)
FIG. 7 is a view of the bearing component holding portion 24 and the bearing component 23 of the optical pickup device 111 according to the comparative example as viewed from one end side of the mounting hole 31. FIG. 8 is a cross-sectional view showing the transition of the optical pickup device 111 in the method of manufacturing the optical pickup device 111 of the comparative example.

  The optical pickup device 111 of the comparative example has a configuration that does not have the protrusion 37 in the bearing component holding portion 24, as compared with the optical pickup device 2 according to the first embodiment. The bearing component press-fitting jig 41 according to the comparative example has a configuration in which the pressure applying portion 43 does not have a groove portion as compared with the bearing component press-fitting jig 41 according to the first embodiment. In the optical pickup device 111 and the bearing component press-fitting jig 41 according to the comparative example, the same configurations as those of the optical pickup device 2 and the bearing component press-fitting jig 41 according to the first embodiment are denoted by the same reference numerals, and overlapping is performed. The description is omitted to avoid it.

  In the manufacturing method of the optical pickup device 111 of the comparative example, the projecting portion forming process in step S3 described above is not performed, and a preparation process similar to step S1 and a bearing component press-fitting process similar to step S2 are performed.

  In this preparation step, as shown in FIG. 7, the bearing component holding portion 24 and the bearing component 23 are arranged with their axes aligned. A second chamfered portion 40 is formed at one end in the axial direction X on the inner peripheral surface of the mounting hole 31 of the bearing component holding portion 24.

  FIG. 8A is a cross-sectional view showing the state of the bearing part press-fitting jig 41, the bearing part holding portion 24, and the bearing part 23 in the initial stage of the press-fitting process. FIG. 8B is a cross-sectional view showing the state of the bearing part press-fitting jig 41, the bearing part holding part 24, and the bearing part 23 at the end of the press-fitting process. The bearing component press-fitting jig 41 presses the bearing component 23 to press-fit the bearing component 23 into the bearing component holding portion 24.

FIG. 8C is a cross-sectional view showing the state of the bearing part holding part 24 and the bearing part 23 after the press-fitting process is completed. The bearing part press-fitting jig 41 is moved in a direction away from the bearing part holding part 24 and the bearing part 23, the press-fitting guide part 42 is pulled out from the insertion hole 32, and the process is completed. Although the bearing part 23 is held in the mounting hole 31, the bearing part 23 may come off from one end side in the axial direction X.
This is because the bearing component 23 is press-fitted from one end side in the axial direction X of the mounting hole 31, so that the inner peripheral surface of the mounting hole 31 is pushed outward in the radial direction on one end side of the mounting hole 31. . Since the base portion 22 and the bearing component holding portion 24 are formed by zinc die casting, the creep strength is inferior as a material characteristic. Creep is a deformation that occurs after a certain period of time when a material subjected to a constant temperature and a constant stress, and is generated by heat in metals such as zinc die casts.

  The manufacturing method of the optical pickup device 2 according to the first embodiment further includes a protrusion forming step in step S3 as compared with the manufacturing method of the optical pickup device 111 of the comparative example. In the method for manufacturing the optical pickup device 2 according to the first embodiment, Step S2 and Step S3 move the bearing component press-fitting jig 41 in the direction close to the bearing component holding portion 24, that is, the other side in the axial direction X. It is performed by a series of processes. Therefore, in the method of manufacturing the optical pickup device 2 according to the first embodiment, the press-fitting of the bearing component 23 and the formation of the protruding portion 36 are performed without increasing the processing time as compared with the method of manufacturing the optical pickup device 111 of the comparative example. Can be performed in a short time.

  As described above, the optical pickup device 2 records and / or reproduces information by irradiating the recording surface of the optical disk 20 with light. The optical pickup device 2 includes an objective lens mounting portion 21, a base portion 22, a bearing component 23, and a bearing component holding portion 24. The objective lens mounting unit 21 is mounted with an objective lens 29 that condenses laser light on the recording surface of the optical disk 20. The objective lens mounting portion 21 is fixed to the base portion 22. The bearing component 23 is formed in a cylindrical shape through which the first guide shaft 11 for supporting the base portion 22 is inserted. The bearing component holding portion 24 is formed continuously with the side portion of the base portion 22 and has a mounting hole 31 in which the bearing component 23 is mounted. The bearing component holding part 24 has a protrusion 36 that protrudes radially inward from the inner peripheral surface of the mounting hole 31 at one end.

  As a result, the optical pickup device 2 can prevent the bearing component 23 from coming out from the one end side of the mounting hole 31 by the protrusion 36. Therefore, the bearing component holding part 24 can hold the bearing component 23. Thus, the base portion 22 can be reliably supported by the first guide shaft 11 via the bearing component 23 and the bearing component holding portion 24. Therefore, the optical pickup device 2 can accurately move in a predetermined direction, for example, the radial direction of the optical recording medium, by the guidance by the first guide shaft 11, and can record and reproduce information with high accuracy.

Further, the optical pickup device 2 can prevent the bearing component 23 from slipping out from the one end portion side of the mounting hole 31 with a simple configuration in which the protruding portion 36 is provided at one end portion of the mounting hole 31. Further, an annular protrusion 37 is formed at one end of the bearing part holding part 24. The protruding portion 36 includes at least a part of the protrusion 37.

  As a result, the bearing component holding portion 24 is formed with the projections 37 uniformly in an annular shape. Therefore, by applying uniform pressure to the entire projections 37, the projections 37 are deformed to form the projections 36. can do. The bearing part holding part 24 can also form the protruding part 36 by deforming only a part of the annular protrusion 37 in the circumferential direction at equal intervals. Therefore, when the protrusion 37 is deformed to form the protruding portion 36, it is possible to suppress the occurrence of the displacement of the bearing component 23 with respect to the bearing component holding portion 24.

  Furthermore, the method for manufacturing the optical pickup device 2 is a method for manufacturing the optical pickup device 2, and includes a bearing component press-fitting step that is Step S <b> 2 and a protruding portion forming step that is Step S <b> 3. In the bearing component press-fitting process, pressure is applied to the bearing component 23 by the bearing component press-fitting jig 41 for press-fitting the bearing component 23 into the mounting hole 31 of the bearing component holding portion 24, and the bearing component 23 is inserted into the axis of the mounting hole 31. Press-fit from one end side in the direction X. In the bearing part press-fitting process, when the bearing part 23 is press-fitted from the one end side of the mounting hole 31 and one end part in the axial direction X of the bearing part 23 passes through one end part of the mounting hole 31, Pressure is applied to one end portion of the mounting hole 31 by the press-fitting jig 41 to deform at least a part of the one end portion of the mounting hole 31 to form the protruding portion 36.

  Thus, in the method for manufacturing the optical pickup device 2, the bearing component press-fitting jig 41 can process the bearing component press-fitting step and the protruding portion forming step in a series of flows. Therefore, in the method for manufacturing the optical pickup device 2, the protruding portion 36 can be formed while suppressing an increase in processing time and work load in each process. Thus, in the method of manufacturing the optical pickup device 2, the optical pickup device 2 that can prevent the bearing component 23 from coming out of the one end portion side of the mounting hole 31 by the protruding portion 36 is manufactured in a short time and easily. Thus, an increase in manufacturing cost can be suppressed.

  Further, the optical disk drive device 1 which is an electronic device includes the optical pickup device 2. The optical pickup device 2 can prevent the bearing component 23 from slipping out from the one end side of the mounting hole 31 by the protrusion 36. Therefore, the bearing component holding part 24 can hold the bearing component 23. Thus, the base portion 22 can be reliably supported by the first guide shaft 11 via the bearing component 23 and the bearing component holding portion 24. Therefore, the optical pickup device 2 can accurately move in a predetermined direction, for example, the radial direction of the optical recording medium, by the guide by the first guide shaft 11. As a result, the electronic apparatus including the optical pickup device 2 can record and reproduce information with high accuracy.

(Second Embodiment)
FIG. 9 is a view of the bearing component holding portion 24 and the bearing component 23 of the optical pickup device 2 according to the second embodiment of the present invention as viewed from one end side of the mounting hole 31. The optical pickup device 2 according to the present embodiment is similar to the optical pickup device 2 according to the first embodiment, and differs only in the configuration of the protrusion 37 of the bearing component holding portion 24. In the optical pickup device 2 according to the present embodiment, the same components as those of the optical pickup device 2 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted to avoid duplication. The manufacturing method of the optical pickup device 2 according to the present embodiment is processed by the same processes as the processes in steps S1 to S3 described above.

  The bearing component holding portion 24 has one or a plurality of protrusions 37 that are formed in a part of the peripheral portion of the mounting hole 31 and project in the axial direction X when viewed in the axial direction X of the mounting hole 31. The protrusion 36 is composed of at least a part of at least one protrusion 37.

  In the present embodiment, the four protrusions 37 are formed on the peripheral portion of the mounting hole 31 at equal intervals. Each projection 37 is formed with a second chamfered portion 40 on one end side in the axial direction X on the inner peripheral surface of the mounting hole 31.

  In another embodiment, one or more arbitrary numbers of protrusions 37 may be formed on the periphery of the mounting hole 31. Further, the shape of the protrusion 37 may be formed by cutting out a part of the protrusion 37 formed in an annular shape.

  As described above, one or a plurality of protrusions 37 are formed at one end of the bearing component holding portion 24. The protrusion 36 is composed of at least a part of one or a plurality of protrusions 37. As a result, since the projection 37 is formed on a part of the peripheral portion of the mounting hole 31 in the bearing component holding portion 24, the projection 37 is deformed by deforming the projection 37 as compared with the case where the projection 37 is formed in an annular shape. The pressure applied when forming the film can be reduced. Therefore, when the protrusion 37 is deformed to form the protruding portion 36, it is possible to suppress the occurrence of the displacement of the bearing component 23 with respect to the bearing component holding portion 24 due to the application of pressure.

(Third embodiment)
FIG. 10 is a cross-sectional view showing the transition of the optical pickup device 2 in the method of manufacturing the optical pickup device 2 according to the third embodiment of the present invention. The optical pickup device 2 according to the present embodiment is similar to the optical pickup device 2 according to the first embodiment, and differs only in that a thin portion 51 is formed on the bearing component 23. In the optical pickup device 2 according to the present embodiment, the same components as those of the optical pickup device 2 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted to avoid duplication.

  The bearing component 23 has a thin portion 51 having an outer diameter smaller than the inner diameter of the mounting hole 31 of the bearing component holding portion 24 at one end portion in the axial direction X. The thin portion 51 is formed so that the outer diameter is smaller than the outer diameter of the bearing component 23. The thin portion 51 is formed longer in the axial direction X than the first chamfered portion 39. In a state after the bearing component 23 is press-fitted into the bearing component holding portion 24, the thin portion 51 is formed at a position facing the protrusion 37 from the inside in the radial direction.

  FIG. 10A is a cross-sectional view showing a state of the bearing component press-fitting jig 41, the bearing component holding portion 24, and the bearing component 23 in the press-fitting process. FIG. 10B is a cross-sectional view showing the state of the bearing component press-fitting jig 41, the bearing component holding portion 24, and the bearing component 23 in the protruding portion forming step. FIG. 10C is a cross-sectional view showing the state of the bearing part holding part 24 and the bearing part 23 after the projecting part forming step is finished.

  The manufacturing method of the optical pickup device 2 according to the present embodiment is processed by the same processes as the processes in steps S1 to S3 described above. In step S3, when the projection 37 of the bearing component holding portion 24 is caulked by the groove portion of the bearing component press-fitting jig 41, the projection 37 is deformed radially inward, and the projection 36 and the thin portion 51 are engaged. .

  The thin-walled portion 51 can define a larger space inside the projection 37 in the radial direction than the chamfered portion 46 for preventing slipping out, thereby facilitating the deformation of the projection 37 in the radial direction. Can do.

  Thus, the thin part 51 is formed at one end of the bearing component 23. As a result, the thin portion 51 is formed at one end portion in the axial direction X of the bearing component 23, so that it can be engaged with the protruding portion 36 formed at one end portion in the axial direction X of the bearing component holding portion 24. . Therefore, the thin portion 51 can enhance the effect of preventing the bearing component 23 from slipping out from the one end portion side of the mounting hole 31.

(Fourth embodiment)
FIG. 11 is a cross-sectional view showing the bearing component holding portion 24 and the bearing component 23 of the optical pickup device 2 according to the fourth embodiment of the present invention. The optical pickup device 2 according to the present embodiment is similar to the optical pickup device 2 according to the first embodiment, and differs only in that a convex portion 56 is formed on the bearing component holding portion 24. In the optical pickup device 2 according to the present embodiment, the same components as those of the optical pickup device 2 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted to avoid duplication. The manufacturing method of the optical pickup device 2 according to the present embodiment is processed by the same processes as the processes in steps S1 to S3 described above.

  The bearing component holding portion 24 has a convex portion 56 that protrudes radially inward from the inner peripheral surface of the mounting hole 31 at the other end portion in the axial direction X of the mounting hole 31. The convex portion 56 is formed in an annular shape on the inner peripheral surface of the mounting hole 31. The inner diameter of the convex portion 56 is formed smaller than the outer diameter of the bearing component 23.

  In another embodiment, one or a plurality of protruding convex portions 56 may be provided on the inner peripheral surface of the other end portion of the mounting hole 31.

  As described above, the other end portion of the bearing component holding portion 24 is provided with the convex portion 56 that protrudes radially inward from the inner peripheral surface of the mounting hole 31. Thus, the optical pickup device 2 can prevent the bearing component 23 from coming out not only from one end side of the mounting hole 31 but also from the other end side by the convex portion 56. Therefore, the bearing component holding part 24 can reliably hold the bearing component 23.

DESCRIPTION OF SYMBOLS 1 Optical disk drive apparatus 2 Optical pick-up apparatus 11 1st guide shaft 12 2nd guide shaft 13 Base chassis 14 Disk drive part 16 Turntable 17 Rotating shaft 20 Optical disk 21 Objective lens mounting part 22 Base part 23 Bearing part 24 Bearing part holding part 26 Light source element 27 Light receiving element 28 Guide shaft holding part 29 Objective lens 30 Clamping piece 31 Mounting hole 32 Insertion hole 36 Projection part 37 Projection 39 First chamfering part 40 Second chamfering part 41 Bearing component press fitting jig 42 Press fit guide part 43 Pressure Giving part 46 Chamfering part 51 for preventing slippage Thin part 56 Convex part 101 Disk drive device 102 Optical pickup device 103 Guide shaft 105 Base part 106 Light source element 107 Objective lens 108 Light receiving element 109 Mounting hole 110 Bearing parts

Claims (7)

An optical pickup device that records and / or reproduces information by irradiating light onto a recording surface of an optical recording medium,
An objective lens mounting portion on which an objective lens that focuses light on the recording surface of the optical recording medium is mounted;
A base portion to which the objective lens mounting portion is fixed;
A guide shaft for supporting the base portion is inserted, and a bearing part formed in a cylindrical shape,
A bearing part holding part formed continuously to the side part of the base part and having a mounting hole in which the bearing part is mounted, and protrudes radially inward from the inner peripheral surface of the mounting hole at one end part An optical pickup device comprising a bearing component holding portion provided with a portion. An annular protrusion is formed on one end of the bearing part holding part,
The optical pickup device according to claim 1, wherein the protruding portion includes at least a part of the protrusion. One or more protrusions are formed at one end of the bearing part holding part,
The optical pickup device according to claim 1, wherein the protruding portion includes at least a part of the one or the plurality of protrusions.   The optical pickup device according to claim 1, wherein a thin portion is formed at one end of the bearing component.   The other end portion of the bearing component holding portion is provided with a convex portion that protrudes radially inward from the inner peripheral surface of the mounting hole. Optical pickup device. It is a manufacturing method of the optical pick-up apparatus as described in any one of Claims 1-5,
A bearing component press-fitting step of applying pressure to the bearing component by a bearing component press-fitting jig for press-fitting the bearing component into the mounting hole of the bearing component holding portion, and press-fitting the bearing component from one end side of the mounting hole;
In the bearing component press-fitting step, when the bearing component is press-fitted from one end side of the mounting hole and the one end portion of the bearing component passes through one end portion of the mounting hole, the bearing component press-fitting jig And a protruding portion forming step of applying pressure to the one end portion to deform at least a part of the one end portion of the mounting hole to form the protruding portion.   An electronic apparatus comprising the optical pickup device according to claim 1.

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