JP3191088B2 - Insert molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an insert molded product, and more particularly, to an insert molded product using a straight line. In particular, it is useful as an insert molded product used in an optical pickup device of an optical disk device.

[0002]

2. Description of the Related Art A conventional lens holding component used in an optical pickup device or the like includes a rectangular fixed frame individually formed in advance by resin molding, and a lens holding component arranged to be positioned inside the fixed frame. And a straight line. The fixing frame, the lens holding portion, and the straight line insert a straight line into a small hole provided in each of the fixed frame and the lens holding portion, and apply and cure an adhesive to the small hole portion. It is integrated by fixing. The molding resin used here includes ABS resin (acrylonitrile-butadiene-styrene copolymer resin), nylon resin (polyamide resin), PPS resin (polyphenylene sulfide resin), PBT resin (polybutylene terephthalate resin), A thermoplastic resin such as a liquid crystal polymer is generally used, and phosphor bronze or beryllium copper is frequently used in a straight line.

[0003]

In the above-mentioned conventional lens holding component, the fixed frame and the lens holding portion are integrated by using a straight line and an adhesive. However, there is a problem in that the steps of applying and curing the adhesive are required, which complicates the manufacturing operation and increases the manufacturing cost. As a result of intensive research conducted by the inventor of the present invention to solve the above-mentioned problems, when a simple straight line is used for an insert molded product, the reason that the straight line comes off the mold portion due to vibrations generated during transportation and the like. Has been found to be because a strong bonding force that can withstand vibration and the like cannot be obtained between the straight line and the molding resin. Therefore,
SUMMARY OF THE INVENTION An object of the present invention is to provide an insert molded product which can improve a straight line pull-out resistance and has a low manufacturing cost.

[0004]

According to a first aspect of the present invention, a rectangular fixed frame (5) and the fixed frame (5) are provided separately from the fixed frame (5). The lens holding part (2) to be obtained is integrated by insert molding through straight lines (3a to 3d) in which a metal plating layer (4) having a melting point lower than the melting point of the molding resin is formed on the outer periphery of the core wire (6). Insert molded article characterized by the following (100)
I will provide a. The insert molded product (10
In (0), the metal of the plating layer (4) uniformly formed on the surfaces of the straight lines (3a to 3d) is melted by the heat of the molding resin, and irregularities are formed on the surfaces of the molded portions of the straight lines (3a to 3d). As a result, the molding resin and the straight lines (3a to 3d) are integrally fixed in a state where the irregularities are formed on the surfaces of the straight lines (3a to 3d). As a result, a straight line (3a to 3
d) and a strong bonding force are obtained between the molding resin and a straight line (3
The pull-out resistance of a to 3d) is greatly improved. Further, since the plating layer (4) can be formed inexpensively by a normal plating process, the manufacturing cost can be relatively reduced.

In a second aspect, the present invention is characterized in that, in the insert molded article (100) having the above structure, the metal of the plating layer (4) is made of any one of tin, lead, and a tin-lead alloy. To provide an insert molded product (100). Tin, lead, tin-lead alloy has a melting point lower than the melting point of thermoplastic resin molding resin such as ABS resin, nylon resin, PPS resin, PBT resin, liquid crystal polymer, and can be suitably combined with these resins. .

In a third aspect, the present invention provides an insert molded product (100) having the above-mentioned structure, wherein the thickness of the plating layer (4) is 0.5 μm or more. )I will provide a. If the thickness of the plating layer (4) is 0.5 μm or more, it is possible to form a sufficient unevenness on the surface.

According to a fourth aspect, the present invention provides a rectangular fixed frame (15) and a lens holding portion (1) provided inside the fixed frame (15) separately from the fixed frame (15).
2) the outer periphery of the core wire (26) is lower than the melting point of the molding resin.
A metal plating layer (24) having a melting point is formed, and the cross-sectional shape of a part embedded in the fixing frame (15) and the lens holding portion (12) is deformed by a mechanical external force. and through a true straight line (2 3a~ 2 3d) providing an insert molded article characterized by being integrated by insert molding. In the insert molded product according to the fourth aspect, the insert molded product according to the first aspect (10
0) and in addition to the operation of the same plating layer (24), when the insert molding, molding resins of the fixed frame (15) and the lens holding portion (12), the cross section of the true straight line (2. 3a-2 3d) It is solidified in such a way that it enters the irregularities of the deformed part. As a result, strong bonding force is obtained during the true straight line (2 3a~ 2 3d) and the molding resin, scratch抜力true linear (2 3a~ 2 3d) is greatly improved. Furthermore, deforming the part of the cross-sectional shape of a true straight line (2 3a~ 2 3d) by a mechanical external force, easily performed by adding a mechanical load by a press device, moreover, additional such adhesive Since no special material is required, the manufacturing cost can be relatively reduced.

[0008] In a fifth aspect, the present invention is Oite the insert-molded product having the above structure, more than 20% compared to the smallest dimension of the cross-section of a portion smallest dimension of the cross-section of the deformed portion is not deformed An insert molded product characterized by being smaller by 80% or less. In the fifth aspect of the insert-molded article, since the lower limit of the deformation rate of the cross-section of the true straight line (2 3a~ 2 3d) was 20%, the true straight line (2 3a~ 2 3
relatively strong bonding force between d) and the molded resin can be obtained, it is possible to sufficiently improve the scratch抜力true linear (2 3a~ 2 3d). In addition, since the upper limit of the deformation rate of the cross section is set to 80%, it is possible to suppress a decrease in straightness and mechanical strength of a straight line due to a mechanical external force.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the embodiments shown in the drawings. Note that the present invention is not limited by this.

First Embodiment FIG. 1 is a schematic configuration diagram of an insert molded product according to a first embodiment of the present invention. FIG. 1A is a plan view. FIG. 1B is a cross-sectional view taken along line OO of FIG. FIG. 2 is a sectional view of a main part of the insert molded product of FIG. FIG. 2A is a cross-sectional view taken along line AA of FIG. FIG. 2B is a cross-sectional view taken along the line BB of FIG. FIG. 2C is a cross-sectional view taken along line C of FIG. The insert molded product 100 includes a rectangular fixed frame 5, an annular lens holding portion 2, and straight lines 3 a to 3 d stretched in a cantilever manner between the two. The dimensions of the fixed frame 5 are, for example, a width W of 1
5 mm, vertical width D is 22 mm, height H is 4 mm, and thickness U is 1 mm. The lens holder 2 is provided inside the fixed frame 5 separately from the fixed frame 5. A hole Q of 4 mm is formed in the center of the lens holding unit 2. The straight lines 3a to 3d are formed by forming a metal plating layer 4 made of tin having a melting point of 232 ° C. on a core wire 6 made of phosphor bronze (or beryllium copper) having a diameter of 0.1 mm and having a melting point of 0.5 μm or more (for example, 1.5 μm). It is formed to a thickness.
The metal plating layer 4 may be formed of lead or a tin / lead alloy depending on the type of resin used for insert molding (described later).

The insert molded article 100 is manufactured by insert molding of a liquid crystal polymer having a melting point of 300 ° C. using a mold (not shown) and straight lines 3a to 3d. The fixed frame 5 and the lens holder 2 provided separately from the fixed frame 5 inside the fixed frame 5 are a straight line provided with a metal plating layer 4 made of tin lower than the melting point of a liquid crystal polymer as a molding resin. It is firmly integrated through 3a to 3d.

The insert molded product 100 is characterized by the structure shown in FIGS. 2A and 2C as compared with the conventional insert molded product. That is, at the time of insert molding, the tin of the metal plating layer 4 is melted by the heat of the liquid crystal polymer, and irregularities J are formed on the surfaces of the molded portions of the straight lines 3a to 3d. Then, the liquid crystal polymer and the straight lines 3a to 3d are solidified and integrated in a state where the irregularities J are still formed on the surface of the molded portion of the straight lines 3a to 3d. Therefore, the bonding force between the straight lines 3a to 3d and the molding resin is strengthened, and the pull-out resistance of the straight lines 3a to 3d is greatly improved.

FIG. 3 shows the result of measuring the relationship between the thickness of the metal plating layer 4 applied to the insert molded article 100 and the pull-out resistance. As a comparative example, for example, the melting point is 1083 ° C.
In the case of an insert molded product formed by insert molding a PBT resin having a melting point of 240 ° C. using a straight line having a plating layer made of copper having a thickness of 1.5 μm and having a melting point of 240 ° C., the pull-out resistance of the straight line is only 50 g I couldn't.

The thickness of the metal plating layer 4 is 0.5 μm
The reason for the above limitation is apparent from FIG. 3, for example, when the thickness of the metal plating layer 4 is 0.3 μm, only 100 g of pull-out resistance can be obtained. This is because power cannot be obtained.

The insert molded product 10 of the first embodiment
According to 0, the pull-out resistance of the straight lines 3a to 3d is significantly improved. Further, the manufacturing cost can be relatively reduced.

Second Embodiment FIG. 4 is a perspective view showing an insert molded product (200) which is a base of an insert molded product according to a second embodiment of the present invention. The insert molded product 200 includes a rectangular fixed frame 15, an annular lens holding portion 12, and straight lines 13 a to 13 d stretched in a cantilever manner therebetween. . As shown in FIG.
In order to stretch cantilever 13 to 13d, straight lines 13a to 13d of insert molded product 200 'immediately before completion are cut at cutting positions K1 to K4. The dimensions of the fixed frame 15 are, for example, a width W of 15 mm, a length D of 22 mm, a height H of 4 mm, and a thickness U of 1 mm. The lens holding part 12 is provided inside the fixed frame 15 separately from the fixed frame 15. A hole Q of 4 mm is formed in the center of the lens holding unit 12. The straight line 13a-
13d is basically phosphor bronze (may be beryllium copper) having a rectangular cross section of 0.1 mm in length (T in FIG. 7) × 0.2 mm in width (W1 in FIG. 7). 1
5 and a cross-sectional deformation portion S in which the cross-sectional shape of a portion embedded in the lens holding portion 12 is deformed by a pressing process.
1, S2 and S3. Although S3 looks functionally meaningless, as described later, the straight lines 13a to 13d
It is necessary to prevent bending. The pressing process will be described later in detail with reference to FIG.

As shown in FIG. 6, at the time of insert molding, the molding resin of the fixed frame 15 and the lens holding portion 12 is
Sectional shape deformation parts S1, S2, S of straight lines 13a to 13d
It is solidified in such a way as to enter the irregularities of No. 3.

FIG. 7 is an explanatory diagram of the pressing step. Press tools P1, P2, and P3 are pressed against the three points corresponding to the cross-sectional shape deformed portions S1, S2, and S3 of the straight line 13a (same for 13b, 13c, and 13d) to apply a mechanical load. Deform the cross-sectional shape. The reason why the three-point press is used is that the cross-sectional shape deformed portions S1, S2
This is because, in the point press, a load is applied to one of the straight lines 13a with a bias, and the straightness may be deteriorated. For this type of press, a press device (mechanical press) using a link mechanism or a press device (pneumatic press, hydraulic press, hydraulic press) using a piston / cylinder mechanism can be used. When the vertical dimension of the cross section after deformation (the minimum dimension of the cross section) is T ′, the degree of deformation = (1−T ′ /
T) × 100 [%] is preferably 20% or more and 80% or less. FIG. 8 shows the result of measuring the relationship between the degree of deformation and the pull-out resistance. If it is less than 20%, sufficient pull-out resistance cannot be obtained, and if it exceeds 80%, durability becomes more problematic than pull-out resistance.

[0019]

[0020] Insert molded article of the second embodiment of the present invention
Then, instead of the straight lines 13a to 13d, shown in FIG.
Using straight lines 23a (23b, 23c, 23d)
You. The straight line 23a (similarly for 23b, 23c and 23d) has a melting point of the molding resin on the outer periphery of a core wire 26 made of phosphor bronze (or beryllium copper) having a rectangular cross section of 0.1 mm in length × 0.2 mm in width. The metal plating layer 24 of tin having a lower melting point (or lead, tin-lead alloy may be used depending on the type of resin) is formed to have a thickness of 0.5 μm or more (for example, 1.5 μm).
The point formed in the thickness of the straight line 13a
(13b, 13c, 13d) . The point having the cross-sectional shape deformation parts S1, S2, S3 is the straight line 1
This is the same as 3a (13b, 13c, 13d) .

According to the insert-molded product of the second embodiment, it is possible to enjoy both the effect of improving the bonding force by melting the metal plating layer 24 and the effect of deforming the straight lines 23a to 23d. Even when the degree of deformation of the cross-sectional shape is reduced, the pull-out resistance can be sufficiently improved. The forming step of the metal plating layer 24 and the pressing step may be performed before or after the former step. However, if the former step is the first step, the surface is smoothed by the metal plating layer 24, so that the mechanical distortion during the pressing step is reduced. If the latter is performed in the first step, no mechanical external force is applied to the metal plating layer 24, so that a high plating thickness can be easily maintained.

[0022]

According to the insert molded product of the present invention, the following effects can be obtained. (1) By applying a metal plating layer to the surface of a straight line, irregularities are generated when the plating layer is melted by the heat of the molding resin, and the bonding force between the straight line and the molding resin is increased.
A straight line does not easily fall off. In addition, if a plating layer is applied in advance, no labor is required during manufacturing, so that the work load can be reduced and the cost can be reduced.

(2) In addition to the effect of the above (1), since the straight cross-sectional shape of the portion embedded in the fixed frame and the lens holding portion is deformed by a mechanical external force, it is formed so as to enter the deformed portion. The resin solidifies, the bonding force between the straight line and the molding resin increases, and the straight line does not easily fall off. Since the deformation of the cross-sectional shape can be performed in a short time by a pressing process or the like, the working time can be reduced and the cost can be reduced. (3) An inexpensive optical pickup device can be obtained that can sufficiently withstand vibration during transportation and the like.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an insert molded product according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the insert molded product of FIG.

FIG. 3 is a graph showing the results of measuring the relationship between the thickness of a metal plating layer formed in a straight line and the pull-out resistance.

FIG. 4 is a perspective view showing an insert molded product on which an insert molded product according to a second embodiment of the present invention is based.

FIG. 5 is a perspective view showing a state immediately before completion of the insert molded product of FIG. 4;

FIG. 6 is an explanatory diagram showing a true straight line of the insert molded product of FIG. 5;

FIG. 7 is an explanatory view showing a step of transforming a cross section of a straight line in FIG. 6;

FIG. 8 is a graph showing the results of measuring the relationship between the degree of deformation of a straight line and the pull-out resistance.

FIG. 9 is a straight perspective view of an insert molded product according to a second embodiment of the present invention.

[Explanation of symbols]

 100, 200 Insert molded product 2, 12 Lens holder 3a-3d, 13a-13d, 23a-23d Straight line 4, 24 Metal plating layer 5, 15 Fixed frame 6, 26 Core J J Unevenness K1-K4 Cutting position P1-P4 Press tool Q hole S1 to S4 Cross section deformation part

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-54425 (JP, A) JP-A-8-87766 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 7/09 G11B 7/095 G11B 7/22 B29C 45/14

Claims (5)

(57) [Claims] 1. A rectangular fixed frame (5), and a lens holding portion (2) provided inside the fixed frame (5) separately from the fixed frame (5) is attached to a core wire (6). An insert-molded product (100), which is integrated by insert molding through straight lines (3a to 3d) having a metal plating layer (4) having a melting point lower than the melting point of the molding resin formed on the outer periphery. 2. The insert molded product (1) according to claim 1,
00), the metal of the plating layer (4) is tin, lead,
An insert molded article (100) characterized by being made of one of a tin-lead alloy. 3. The insert molded product (100) according to claim 1, wherein said plating layer (4) has a thickness of 0.5 μm or more. . 4. A fixed frame (15) having a rectangular shape and a lens holder (12) provided inside the fixed frame (15) separately from the fixed frame (15), and Perimeter
Metal plating layer with melting point lower than the melting point of molding resin
The fixing frame to form a (24) (15) and said lens holder true straight line portion of the cross-sectional shape is deformed by mechanical force of the portion to be embedded in the (12) (2. 3a-2
An insert molded product characterized by being integrated by insert molding through 3d) . 5. The insert molded product according to claim 4, wherein a minimum dimension of a cross section of the deformed portion is 20% or more than a minimum dimension of a cross section of an undeformed portion.
% . An insert-molded product characterized by being smaller by not more than% .