JP2006099814A - Optical pickup and manufacturing method of its collision preventing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical pickup whose collision preventing device for preventing collision of an optical disk and an objective lens when a movable part of the optical pickup and the optical disk come close to each other can be inexpensively manufactured in a simple production process. <P>SOLUTION: The optical pickup has the collision preventing device 10 so that the objective lens 4 condensing light on a recording surface of the optical disk and the optical disk do not directly collide with each other. The collision preventing device is provided with at least one molding body 11 and the molding body is implanted in an upper surface 21 on the periphery of a lens holding part 12 holding the objective lens 4 and at least a top part of the molding body is coated with a buffering coating film. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical pickup that collects light by an objective lens on a recording surface of an optical disk and records and reproduces information, and a collision prevention apparatus for preventing the objective lens and the optical disk from directly colliding with each other. It relates to the manufacturing method.

The optical pickup is used in an optical disc device (for example, a DVD recorder, a CD player) such as an optical disc reproducing device and an optical disc recording / reproducing device. The optical disk device is also mounted on a PC (personal computer).
An optical pickup is an apparatus that records and reproduces information by condensing light, for example, laser light, onto a recording surface of an optical disc that is a recording medium. In order to prevent direct collision between the objective lens of the optical pickup and the optical disk, several techniques have been proposed in the past.

For example, in Patent Document 1 (Japanese Patent Application Laid-Open No. 2002-237071), when a buffer layer is laminated from the periphery of the lens effective surface of the objective lens to the outer edge or outside of the objective lens, and the objective lens approaches the surface of the optical disk, The buffer layer is in contact with the surface of the optical disc before the effective lens surface.
However, in this case, since the buffer layer must be laminated on the objective lens itself, the configuration of the objective lens is complicated and its manufacture is difficult.
Therefore, in the optical pickup actuator described in Patent Document 2 (Japanese Patent Application Laid-Open No. 2003-338063), an objective lens collision prevention protector unit is provided in an objective lens holding cylinder that holds an objective lens provided in a movable unit. Yes.

JP-A-2002-237071 Japanese Patent Laid-Open No. 2003-338063

In order to prevent the collision preventing protector from damaging the surface of the optical disk when it comes into contact with the surface of the optical disk, it is preferable to apply a buffer coating to the collision preventing protector. Therefore, there are cases where the coating process is performed by a method as shown in FIGS.
FIGS. 7 to 10 are diagrams showing the prior art, FIG. 7 is a perspective view showing a first step of applying a collision preventing protector, and FIG. 8 is an enlarged perspective view showing a second step of the application processing. 9A, 9B, and 9C are a perspective view, a plan view, and a front view, respectively, showing a third step of the coating process, and FIG. 10 is an enlarged view of a portion X in FIG.

In order to perform the coating process, first, a plurality of lens holders 102 provided with the collision preventing protector 101 (FIG. 8) are mounted side by side on the coating base 103 for coating. A plurality of support members 104 are fixed in advance on the upper surface of the mounting base 103, and the lens holder 102 is attached to the support member 104 for positioning.
A shielding plate 105 is placed on the upper surface side of the mounting base, and a plurality of holes 106 are arranged in the shielding plate 105 at positions corresponding to the positions of the collision preventing protector 101.
Accordingly, when the anti-collision protector 101 is applied, as shown in FIGS. 7 and 8, the plurality of lens holders 102 are mounted on the plurality of support members 104 and positioned in the first step.

Next, in the second step, a shielding plate 105 in which a plurality of holes 106 are arranged in correspondence with the arrangement position of the collision preventing protector 101 of the lens holder 102 is placed on the upper portion of the mounting base 103 to cover the holes 106. Is arranged on the upper surface of the collision preventing protector 101. As a result, as shown in FIG. 9, the lens holder 102 is sandwiched between the shielding plate 105 and the mounting base 103.
In the final third step, paint is applied from the hole 106 of the shielding plate 105 to the upper surface of the buffer protection protector 101 by means such as spraying or vapor deposition to form a buffer coating film (FIG. 9, FIG. 10).

In this way, conventionally, since the buffering protector 101 is applied in the manufacturing process of the lens holder 102, the lens holder 102 itself is arranged between the mounting base 103 and the shielding plate 105 in the buffering state. It is necessary to apply the coating film to the protector part for collision prevention.
As a result, the number of lens holders 102 that can be processed by a single coating process is naturally reduced, and this coating process becomes a bottleneck, making it difficult to mass-produce the lens holders 102.
Moreover, since the cost for the coating process is extremely high, this cost occupies most of the manufacturing cost of the lens holder 102, and the lens holder 102 is expensive. Moreover, the apparatus for the coating treatment is complicated and the manufacturing process is complicated.

  The present invention has been made to solve such a problem, and a simple anti-collision device for preventing a collision between an optical disk and an objective lens when the movable part of the optical pickup and the optical disk approach each other. It is an object of the present invention to provide an optical pickup that can be manufactured at a very low cost in the process and a method for manufacturing the collision prevention device.

In order to achieve the above object, an optical pickup according to the present invention is an optical pickup having a collision prevention device for preventing an objective lens for condensing light on a recording surface of an optical disc and the optical disc from directly colliding with each other. The anti-collision device includes at least one molded body, and the molded body is planted on the upper surface of the peripheral portion of the lens holding portion that holds the objective lens, and is buffered on at least the top of the molded body. The coating film is applied.
The molded body of the anti-collision device is integrally molded with a head having the top of the head and a foot extending downward from the head, and the foot of the molded body is It is preferable that it is inserted into a molded body hole or a molded body recess formed in the upper surface of the peripheral portion.
Further, it is preferable that a pair of the molded bodies is provided on both sides of the objective lens.
A method for achieving the above-described object is a method of manufacturing a collision preventing device for the optical pickup, wherein the molded body having the buffer coating film is manufactured separately from the manufacturing process of the lens holding unit. In the manufacturing process of the molded body, a large number of base materials of the molded body are arranged in a large number of application holes or application recesses of the mounting base, and at least the top of each of the molded body base materials. In this state, a buffer coating film is applied to at least the top of the base material.
The molding base material is disposed in the coating hole or the coating recess of the mounting base to expose only the head of each molding base material, and the buffer coating film only on the exposed head. Is preferably applied.

  Since the optical pickup and the method for manufacturing the collision prevention device according to the present invention are configured as described above, the collision prevention device for preventing the optical disc and the objective lens from colliding when the movable part of the optical pickup and the optical disc approach each other. Can be manufactured at a very low cost by a simple manufacturing process.

In recent years, the recording density of information has been improved in optical discs such as DVDs, and the NA (numerical aperture) of the objective lens of the optical pickup needs to be increased, so the distance between the optical disc and the objective lens has become shorter. Yes.
As a result, there is a high possibility that the optical disk and the movable part come into contact with each other, and there is a possibility that the optical disk and the objective lens may be damaged when they come into contact with each other.

Therefore, in the following embodiments, the collision prevention device of the optical pickup includes at least one molded body, and this molded body is planted on the upper surface of the peripheral portion of the lens holding portion that holds the objective lens, and at least the molded body is A buffer coating is applied to the top of the head.
Thereby, the collision preventing device can be manufactured at a very low cost by a simple manufacturing process. Further, when the movable part and the optical disk approach each other, the top of the molded body comes into contact with the optical disk, so that the optical disk and the objective lens can be prevented from being damaged.

Hereinafter, an embodiment according to the present invention will be described with reference to FIGS.
1 to 6 are views showing an embodiment of the present invention. FIG. 1 is a perspective view of an optical pickup. FIGS. 2A and 2B are perspective views showing an assembling procedure of a movable part. (C) is a top view of a movable part, FIG.2 (D) is the II-II sectional view taken on the line of FIG.2 (C).
3A is a front view of the molded body before the coating treatment, FIG. 3B is a front sectional view of the molded body after the coating processing, and FIGS. 3C and 3D are moldings according to the modified examples. FIG. 3E is a front sectional view of a molded body according to another modification.

As shown in FIGS. 1 to 3, the optical pickup 1 of the present invention includes a movable part 2. The movable portion 2 is provided with a focus coil 8 and a tracking coil 9, and an objective lens 4 for condensing light such as laser light on the recording surface (surface 3a) of the optical disc 3. The position of the objective lens 4 with respect to the optical disk 3 can be adjusted by flowing currents to the focus coil 8 and the tracking coil 9 of the movable part 2.
The optical pickup 1 includes a plurality of support wires 5 that movably support the movable part 2, a support base 6 that supports the support wire 5, and a yoke part (a yoke part) 7 to which the support base 6 is attached. ing.

The optical pickup 1 has a collision prevention device 10 provided in the movable part 2. The collision prevention device 10 has a function of preventing the optical disk 3 and the objective lens 4 from directly colliding when the movable part 2 and the optical disk 3 approach each other.
The collision prevention device 10 includes at least one (two in this case) molded body 11 formed in a predetermined shape such as a pin shape. The molded body 11 is planted on the upper surface 21 of the peripheral portion of the lens holding portion 12 that holds the objective lens 4, and a buffer coating 15 is applied (coated) to at least the top 14 of the molded body 11. Yes. The top 14 is a portion of the outer surface of the molded body 11 that may be in direct contact with the optical disc 3.

In the present invention, the shock-absorbing device 15 for preventing the collision between the optical disk 3 and the objective lens 4 can be manufactured at a very low cost by a simple manufacturing process because the shock-absorbing coating film 15 has only to be applied to the molded body 11. can do.
Since the movable body 2 is provided with a molded body 11 and the molded body 11 prevents direct contact between the objective lens 4 and the optical disk 3, the optical disk 3 and the objective lens 4 can be protected. Even if the molded body 11 and the optical disk 3 are in direct contact, since the buffer film 15 is applied to the molded body 11, damage to the surface 3a of the optical disk 3 can be prevented.

An optical pickup 1 used in an optical disk device (not shown) is movable while being controlled in the radial direction of an optical disk 3 as a recording medium by a moving mechanism (not shown). The optical disc apparatus rotates the optical disc 3 with a drive motor and moves the optical pickup 1 to a desired position with a moving mechanism.
Then, the optical pickup 1 collects light (for example, laser light) on the recording surface (surface 3 a) of the optical disk 3 with the objective lens 4 to record and reproduce information on the optical disk 3.
Examples of the optical disk 3 include CD, CD-ROM, CD-R, CD-RW, MD, MO, DVD-ROM, DVD-RAM, DVD-R, and DVD-RW.

For convenience of explanation, the direction parallel to the optical axis B of the objective lens 4, that is, the focus direction is the X direction, and in particular, the optical disc 3 side and the anti-optical disc side are the upward direction and the downward direction, respectively. A direction orthogonal to the X direction (radial direction of the optical disc 3), that is, a tracking direction is defined as a Z direction, and a direction orthogonal to the X direction and the Z direction is defined as a Y direction.
In the present embodiment, the case of the “lens offset type” optical pickup 1 in which the objective lens 4 is arranged eccentrically on one side from the central portion of the movable portion 2 is shown. The present invention can also be applied to a “lens center type” optical pickup in which the objective lens is disposed at substantially the center of the movable portion.

A support base 6 is attached to the yoke portion 7 made of a magnetic material. The support base 6 supports a plurality of (here, four) support wires 5, and the four support wires 5 support the movable portion 2 in a movable manner.
A permanent magnet 19 that constitutes a magnetic circuit between the focus coil 8 and the tracking coil 9 is attached to a predetermined position of the yoke portion 7. A current is supplied to the focus coil 8 and the tracking coil 9 provided in the movable part 2 via the support wire 5.
If a current is passed through the focus coil 8, the movable part 2 can be moved in the focus direction (direction parallel to the optical axis B of the objective lens 4 (X direction)). If a current is passed through the tracking coil 9, the movable part 2 can be moved in the tracking direction (radial direction of the optical disc 3 (Z direction)).

The movable portion 2 has a main body portion 16 having a predetermined shape, and the main body portion 16 is integrally formed of an insulating resin material or the like. The objective lens 4, the focus coil 8, the tracking coil 9, and the like are attached at predetermined positions on the main body 16. The main body 16 includes a lens support 17 that supports the objective lens 4, and coils 8 and 9, and a coil support 18 that is substantially rectangular in plan view.
A lens holding portion 12 is formed integrally with the lens support portion 17. The inner surface of the lens holding portion 12 is circular in order to hold the objective lens 4. The objective lens 4 is held by the lens holding unit 12 so that the central axis of the lens holding unit 12 and the optical axis B of the objective lens 4 coincide.
One focus coil 8 and a pair of tracking coils 9 arranged in the Z direction are provided inside the coil support portion 18.

In the lens support portion 17, a molded body hole 22 (or a molded body recess 22 a shown in FIG. 3E) is formed on the upper surface 21 around the lens holding section 12 that directly holds the objective lens 4. ing.
The molded body 11 is formed separately from the movable portion 2 and is attached to the molded body hole 22 (or the molded body recess 22a) of the movable portion 2 by fixing means such as caulking, adhesion, and press fitting. ing. 2A shows a state in the middle of attaching the molded body 11 to the molded body hole 22, and FIGS. 2B to 2D show a state in which the mounting of the molded body 11 is completed. .

The molded body 11 has a head 23 having a top 14 and a foot 24 extending downward from the head 23 and is integrally formed in a pin shape. The base material of the molded body 11 is integrally formed as a whole by rubber, synthetic resin or the like.
The legs 24 of the molded body 11 are inserted into the molded body holes 22 (or the molded body concave portions 22a) formed in the peripheral upper surface 21 of the lens holding section 12.
In this way, the molded body 11 is formed separately from the main body portion 16, and the molded body 11 is planted on the upper surface 21 of the peripheral portion of the lens holding portion 12. In another manufacturing process, the buffer coating film 15 can be applied to at least the top 14 of the molded body 11.
The buffer coating film 15 is preferably made of a material having a good sliding property from the viewpoint of protecting the optical disk 3. For example, a UV paint, a UV adhesive, a UV curable resin, a fluororesin (Teflon (registered trademark)), etc. These buffer coating films 15 are applied to at least the top 14 of the head 23 by a method such as coating, vapor deposition, painting, or adhesion.

In order to manufacture the molded body 11, for example, a molded body base material 30 as shown in FIG. 3 (A) is prepared. The molded body base material 30 has a head portion 23 having a top portion 14 and a foot 24 integrally formed at a lower portion thereof. The molded body 11 shown in FIGS. 3A to 3D shows a case where the whole is formed in a pin shape.
As shown in FIG. 3B, when the buffer coating 15 is applied to both the top 14 and the outer peripheral surface of the head 23, or as shown in FIGS. In some cases, the buffer coating 15 is applied only to the top 11 of the head 11.

Further, the molded body 11 according to the modification shown in FIG. 3 (E) has a head portion 23 having a top portion 14 to which a buffer coating film 15 is applied, and a foot 24 extending downward from the head portion 23. And it is integrally formed.
Further, the buffer coating 15 is applied to both the top 14 and the outer peripheral surface of the head 23. The foot 24 has a shape corresponding to the shape of the concave portion 22a for the molded body, is formed to bulge downward from the head 23, and can be inserted into the concave portion 22a for the molded body.

The molded body 11 attached to the lens support portion 17 can directly contact the optical disc 3 before the objective lens 4 when the movable portion 2 and the optical disc 3 approach each other. Eventually, when the molded body 11 comes into contact with the optical disc 3, only the top portion 14 to which the buffer coating film 15 is applied always comes into contact with the surface 3 a of the optical disc 3 before the objective lens 4. This prevents the optical disk 3 and the objective lens 4 from coming into direct contact with each other, thereby preventing the surface 3a of the optical disk 3 and the objective lens 4 from being damaged.
A pair of molded bodies 11 is provided on both sides of the objective lens 4. As a result, even when the optical disk 3 is inclined with respect to the objective lens 4 and approaches the movable part 2, one of the molded bodies 11 comes into contact with the optical disk 3 before the objective lens 4. Therefore, direct contact between the optical disc 3 and the objective lens 4 can be prevented, and damage to the optical disc 3 and the objective lens 4 can be prevented.
Although the case where a pair of the molded bodies 11 are provided on both sides of the objective lens 4 is shown, this is a case where the molded bodies 11 are provided at one or a plurality of appropriate positions on the upper surface 21 of the peripheral portion of the lens holding portion 12. May be.

The optical pickup 1 has an optical system (not shown). This optical system includes a light source such as a semiconductor laser that generates laser light, a photodetector, a reflection mirror, a lens, and a diffraction grating. The objective lens 4 is also included in this optical system.
The photodetector receives the laser beam reflected by the recording surface of the optical disc 3, detects the reproduction signal, and also detects a focus error signal, a tracking error signal, and the like.

Next, the operation of the optical pickup 1 will be described.
First, in the optical disc apparatus, the optical pickup 1 is moved to a desired position by the moving mechanism while the optical disc 3 is rotationally driven by the drive motor. Then, the laser beam generated in the optical system is condensed on the recording surface by the objective lens 4 to record and reproduce information on the optical disc 3.
When controlling the state of the optical pickup 1 (position, posture, etc. of the movable unit 2), information related to posture control such as the tilt of the optical disc 3 detected by the photodetector is converted into an electrical signal by the conversion unit and controlled. Output as electrical signals (focus error signal, tracking error signal, etc.).
The control unit controls the current that flows through the focus coil 8 and the current that flows through the tracking coil 9 based on the electrical signals (focus error signal, tracking error signal, etc.) output from the conversion unit.

When the objective lens 4 is moved in the focus direction (X direction), the control unit supplies a control current corresponding to the direction and amount of movement to the focus coil 8 via the support wire 5. Then, the movable part 2 moves (shifts) in the focus direction (X direction) with respect to the optical disk 3 by the electromagnetic force generated by the focus coil 8 to adjust the position of the objective lens 4.
Similarly, if the current supplied to the two tracking coils 9 via the support wire 5 is controlled, the movable part 2 moves (shifts) in the tracking direction (Z direction) of the optical disk 3 by the electromagnetic force generated by the tracking coil 9. Then, the position of the objective lens 4 is adjusted.
In this way, the position of the movable unit 2 is controlled so as to move in the focus direction and the tracking direction, respectively.

During normal operation, information is recorded on and reproduced from the optical disc 3 by the optical pickup 1 while the optical disc 3 is separated from the movable portion 2.
However, if the set of the optical disk 3 is insufficient with respect to the turntable or the optical disk 3 itself is distorted, the rotating optical disk 3 and the movable part 2 may approach each other.
In this case, even if one or both of the pair of molded bodies 11 come into contact with the surface 3a of the rotating optical disk 3, the buffer coating 15 is applied to at least the top 14 of the molded body 11. There is no risk of scratching the surface 3a of the optical disc 3.
Further, when the movable part 2 and the rotating optical disc 3 approach each other, the molded body 11 always comes into contact with the optical disc 3 before the objective lens 4, so the objective lens 4 does not come into direct contact with the optical disc 3, Damage to the objective lens 4 can be prevented.

Next, a method for manufacturing the collision preventing apparatus 10 will be described.
4 is a perspective view showing a first step of applying a molded body, FIG. 5A is a perspective view showing a second step of applying a molded body, and FIG. 5B is a perspective view of FIG. FIG. FIGS. 6A and 6B are a plan view and a front view of FIG. 5A, respectively, FIG. 6C is an enlarged view of the VI part of FIG. 6B, and FIG. It is a perspective view which shows the one part molded object of many processed molded objects.

As shown in FIGS. 4 to 6, the molded body 11 having the buffer coating film 15 is manufactured in a manufacturing process different from the manufacturing process of the lens holding portion 12 (FIG. 1).
In the manufacturing process of the molded body 11, a mounting base 32 for coating in which a large number of coating holes 31 (or coating recesses) are arranged is prepared. Then, a large number of molded body base materials 30 are arranged in the application holes 31 (or application concave portions) of the mounting base 32, and at least the top 14 of each molded body base material 30 (in this embodiment, the head). 23) is exposed to the outside of the mounting base 32 (first step).
At this time, since the size of the molded body base material 30 is small, an extremely large number of application holes 31 are formed in the mounting base 32, and an extremely large number of molded body base materials 30 are formed in the respective application holes 31 of the mounting base 32. Can be installed.

Next, in a second step of applying the molded body base material 30, the buffer coating film 15 is applied to at least the top part 14 of each molded body base material 30 with the head portion 23 exposed.
In this way, compared with the manufacturing method in which the lens holder (corresponding to the lens support portion in the present embodiment) is directly applied by the above-described prior art, the method of the present invention has an extremely large number of molded bodies. The molded body 11 can be mass-produced by applying and treating 11 together.
Since a large number of application holes 31 need only be formed in the mounting base 32, a large amount of the molded body 11 can be manufactured by a simple operation with a simple manufacturing process, and the unit price of the molded body 11 can be extremely low. can do.

In addition, the molded body base material 30 is disposed in the application hole 31 (or the application recess) of the mounting base 32 to expose only the head portion 23 of each molded body base material 30, and the exposed portion of the head portion 23 is exposed. It is preferable to apply the buffer coating film 15 to the whole.
In this way, since the coating area is increased compared to the case where the buffer coating film 15 is applied only to the top portion 14, the portion where the molded body base material 30 is directly exposed is reduced, and the optical disc 3 is more It can be surely protected.

Since the molded body 11 is provided with the feet 24, the molded body 11 can be easily attached to the lens support portion 17 by inserting the feet 24 into the molded body holes 22 (or the molded body recesses 22a). And workability is good.
Further, in the conventional coating process, a shielding plate is necessary to prevent the coating film from adhering to the portion other than the collision prevention protector portion. However, according to the present invention, such a shielding plate is unnecessary. This simplifies the manufacturing process.

According to the present invention, since the cost for applying the buffer coating film 15 is reduced, the manufacturing cost of the main body 16 of the movable part 2 is, for example, 1/15 to 1/20 compared to the prior art. descend.
Since the molded body 11 is a separate part from the main body 16 of the movable part 2, the buffer coating 15 is applied only to the molded body 11 and does not adhere to other parts. Therefore, there is no fear that the buffer coating film adheres to an unnecessary part of the coating and adversely affects it. Since only the molded body 11 separated from the main body portion 16 of the movable portion 2 can be changed in design to an arbitrary configuration, the degree of freedom in design is expanded.

The embodiments of the present invention (including various modifications; the same applies hereinafter) have been described above, but the present invention is not limited to the above-described embodiments, and various modifications and additions can be made within the scope of the present invention. Etc. are possible.
In the drawings, the same reference numerals denote the same or corresponding parts.

  The present invention is applied to an optical pickup attached to an optical disc apparatus that records and reproduces information by condensing a laser beam or the like on a recording surface such as a DVD or CD with an objective lens.

1 to 6 are views showing an embodiment of the present invention, and FIG. 1 is a perspective view of an optical pickup. It is a figure which shows a movable part. It is a figure which shows a molded object. It is a perspective view which shows the 1st process which apply | coats a molded object. It is a perspective view which shows the 2nd process of apply | coating a molded object. FIGS. 6A and 6B are a plan view and a front view of FIG. 5A, respectively, FIG. 6C is an enlarged view of the VI part of FIG. 6B, and FIG. FIG. FIGS. 7 to 10 are views showing the prior art, and FIG. 7 is a perspective view showing a first step of coating treatment. It is an expansion perspective view which shows the 2nd process of an application | coating process. It is a figure which shows the 3rd process of an application | coating process. It is the X section enlarged view of FIG.9 (C).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical pick-up 3 Optical disk 4 Objective lens 10 Collision prevention apparatus 11 Molded body 12 Lens holding part 14 Head top part 15 Coating film 21 Upper surface 22 Molded body hole 22a Molded body recessed part 23 Head 24 Feet 30 Base material of molded body 31 Application hole 32 Mounting base

Claims (4)

An optical pickup having an anti-collision device for preventing an objective lens for condensing light on the recording surface of an optical disc and the optical disc from colliding directly,
The collision prevention apparatus includes at least one molded body, and the molded body is planted on the upper surface of the peripheral portion of the lens holding portion that holds the objective lens, and a buffer coating film is provided on at least the top of the molded body. An optical pickup characterized by being coated. The molded body of the anti-collision device is integrally molded with a head having the crown and a leg extending downward from the head,
2. The optical pickup according to claim 1, wherein the leg of the molded body is inserted into a molded body hole or a molded body recess formed in the upper surface of the peripheral portion of the lens holding portion. A method for manufacturing the collision preventing device according to claim 1 or 2,
The molded body having the buffer coating film is manufactured in a manufacturing process different from the manufacturing process of the lens holding portion. In the manufacturing process of the molded body,
After arranging a large number of base materials of the molded body in a large number of application holes or application recesses of the mounting base to expose at least the top of each of the molded body base materials,
In this state, a buffer coating film is applied to at least the top of each molded body base material. Arranging the molded body base material in the application hole or the application recess of the mounting base to expose only the head of each molded body base material;
4. The method for manufacturing a collision preventing device for an optical pickup according to claim 3, wherein the buffer coating film is applied only to the exposed head.

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