JP3691922B2 - Manufacturing method of resin molded products - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a resin molded product, and more particularly to a method for manufacturing a resin molded product in which a fragile insert part such as a half mirror is inserted and a hole extending to the insert part is formed in the molded product body.
[0002]
[Prior art]
The optical component 1 as a resin molded product according to a conventional example will be described with reference to FIGS.
The optical component 1 constitutes an optical communication device.
Reference numeral 3 denotes a molded product body, and the molded product body 3 is provided with a mirror 5. Further, holes 7 and 9 are formed in the molded product body 3, and these holes 7 and 9 extend to the mirror 5. Optical fibers 11 and 13 are inserted into the holes 7 and 9, respectively.
In this optical component 1, the optical signal transmitted by the optical fiber 11 is reflected by the mirror 5 and transmitted to the optical fiber 13, or conversely, the optical signal is transmitted from the optical fiber 13 through the mirror 5 and the optical fiber 11. .
[0003]
A method for manufacturing the optical component 1 will be described.
As shown in FIG. 8, the mirror 5 is disposed at a predetermined position of the cavity 17 of the mold 15, and the pins 19 and 21 are further protruded and brought into contact with the mirror 5. Then, the resin is filled into the cavity 17, the resin is cured, the pins 19 and 21 are removed, and the mold 15 is opened.
[0004]
[Problems to be solved by the invention]
However, the method for manufacturing an optical component has a problem that the tip of the thin pin 19 abuts against the mirror 5 and the mirror 5 is likely to be damaged. By the way, as shown in FIG. 9, in order to position the optical fiber 11 (13), the hole 7 of the molded product body 3 is assumed to have a smaller diameter from the middle portion, and a step portion 23 is formed. It is conceivable that the edge of the tip of the optical fiber 11 (13) is brought into contact with the optical fiber 11 (13). Also in this case, since the pin 19 whose tip is thinner than the optical fiber is brought into contact with the mirror 5, there is a high possibility that the mirror 5 is damaged.
[0005]
The present invention has been made paying attention to the above-mentioned conventional problems, and provides a method for producing a resin molded product capable of forming a stepped portion in a hole extending to an insert part without damaging a particularly fragile insert part. The purpose is to do.
[0006]
[Means for Solving the Problems]
The invention of claim 1 includes a molded product body, an insert part inserted into the molded product body, a first hole formed in the molded product body and extending to the insert part, and protruding from an inner surface of the first hole. And a step of placing an insert part at a predetermined position of a cavity, and a tip of a first hole forming member abutting on the insert part to form the first hole. And a second hole forming member having a smaller cross-sectional area than the first hole forming member protrudes into the cavity along with the first hole forming member in order to form a second hole smaller than the cross sectional area of the first hole. And a step of filling the cavity with a resin, and after the resin filled in the cavity is cured, a portion of the molded product body where the second hole is formed is punched and dropped into the first hole. Seen, a method for producing a resin molded article characterized by comprising a step of forming a stepped portion around the opening of the second bore.
[0007]
According to a second aspect of the present invention, in the method for producing a resin molded product according to the first aspect, the first hole forming member has at least a tip end that is cylindrical, and an edge of the cylindrical tip end of the first hole forming member. This is a method for manufacturing a resin molded product, wherein the part is brought into contact with the insert part.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS.
Reference numeral 31 indicates an optical component as a resin molded component, and the optical component 31 is a component constituting an optical communication device.
The molded product body 33 of the optical component 31 is formed by integrally forming a rectangular parallelepiped horizontal block 35 and a rectangular parallelepiped vertical block 37, and the front shape is formed in an inverted T shape.
[0009]
The horizontal block 35 is formed with a horizontal hole 39 as a first hole extending in the horizontal direction. The horizontal hole 39 is a through hole and opens at both end faces of the horizontal block 35.
A vertical hole 41 as a first hole is formed in the vertical block 37, and the vertical hole 41 communicates with a horizontal hole 39. The horizontal hole 39 and the vertical hole 41 are prismatic, and the axis of the vertical hole 41 is orthogonal to the axis of the horizontal hole 39.
A half mirror 43 is disposed at a predetermined position in the molded product main body 33 with an inclination of 45 degrees.
[0010]
The horizontal hole 39 is provided with a pair of left and right stepped portions blocks 45 and 47, and the vertical hole 41 is provided with a stepped portion block 49 fitted tightly. Small holes 51a, 53a, and 55a are formed in the step blocks 45, 47, and 49, respectively. The axial centers of the small holes 51 a, 53 a, and 55 a intersect on the reflection surface of the half mirror 43.
[0011]
Next, a method for manufacturing the optical component 1 will be described.
The half mirror 43 is arranged at a predetermined position of the mold 57, and then the mold 57 is closed to form the cavity 59. In addition, a pair of pins 61a and 61b as a first hole forming member, a pin 62, and a pin 63 as a second hole forming member are projected into the cavity 59. Further, the pins 61a and 61b and the pin 63 (the side corresponding to the pin 61b is not shown) protrude in the cavity 59 in a state of being arranged in parallel.
The cross-sectional area of the pin 63 that forms the small holes 51 and 53 is smaller than the cross-sectional area of the pins 61 a and 61 b that form the horizontal hole 39. The cross-sectional area of the pin 63 (not shown) that forms the small hole 55 is smaller than the cross-sectional area of the pin 62 that forms the vertical hole 41.
[0012]
The pins 61a and 61b have a rectangular tube shape and the tip is cut at an angle of 45 degrees, and the front and back surfaces of the half mirror 43 arranged with an inclination of 45 degrees have no gaps. Touch. Since the pins 61a and 61b are rectangular tubes, only the edge portion 64 at the tip of the pins 61a and 61b is in contact with the half mirror 43. Therefore, it is possible to prevent the center portion of the half mirror 43 from being damaged. The tip of the pin 62 contacts the upper surface of the pin 61a.
The pin 63 projects into the cavity 59 by a predetermined length.
The pin 62 has a prismatic shape, but may have a rectangular tube shape as with the pins 61a and 61b.
[0013]
Next, the resin is filled into the cavity 59 to form the molded product body 3, and after the resin is cured, the pins 61a, 61b, 62, and 63 are moved backward. In the molded product body 3, horizontal holes 39 are formed by pins 61, 61 b, vertical holes 41 are formed by pins 62, and small holes 51, 53, 55 are formed by pins 63.
As shown in FIG. 3, the mold 57 is opened, the punch 65 is lowered, and a punching portion 67 indicated by a two-dot chain line in FIG. 3 is punched. The punched portion 67 is a portion where the small hole 51 is formed.
[0014]
As shown in FIG. 4, the punched portion 67 punched by the punch 65 is dropped into the middle portion of the horizontal hole 39 to become a stepped portion block 45. The small hole 51 becomes a through hole 51 a and communicates with the horizontal hole 39.
Similarly, the stepped portions blocks 45 and 47 are punched by punching portions 47 and 49 shown in FIG. 1 and disposed in the horizontal hole 39 and the vertical hole 41, respectively. The small holes 53 and 55 are also through holes 53a and 55a, and communicate with the horizontal hole 39 and the vertical hole 41, respectively. As shown in FIG. 4, the step block 49 is formed by punching the punching portion 69 shown in FIG. 1 with a punch that operates in the horizontal direction.
[0015]
As shown in FIG. 5, the optical fiber 72 is inserted from one side of the horizontal hole 39, and the optical fiber 72 is positioned by bringing the front end surface into contact with the front surface 75 as the stepped portion of the stepped portion block 45. The same applies to the stepped portion block 47 and the stepped portion block 49, and the optical fiber 73 is inserted from the other side of the horizontal hole 39 and brought into contact with the front surface 76 of the stepped portion block 47 (not shown in FIG. 5). Further, the optical fiber 74 is inserted into the vertical hole 41 and brought into contact with the front surface 77 of the step block 49 to be positioned.
[0016]
In the optical component 31, an optical signal is transmitted between the optical fibers 72, 73, and 74 through a half mirror.
[0017]
The embodiment of the present invention has been described in detail above, but the specific configuration is not limited to this embodiment, and the present invention can be changed even if there is a design change without departing from the gist of the present invention. include.
In the said embodiment, although the optical component was shown as a resin molded product, this invention is not limited to this, You may apply to other resin molded components, such as components for motor vehicles.
[0018]
The insert component is not limited to a half mirror, and may be an electronic component such as a semiconductor or any other component. Furthermore, the present invention can be applied to positioning of lead wires and the like in addition to optical fibers.
Although the pin 61 has a rectangular tube shape, the rectangular tube portion does not extend over the entire length of the pin 61, and it is sufficient that at least only the tip contacting the half mirror 43 is hollow. Furthermore, it is good also as a structure which does not make a pin cylindrical.
[0019]
【The invention's effect】
As described above, according to the present invention, a stepped portion can be formed in a hole extending to an insert part without damaging a particularly fragile insert part.
[Brief description of the drawings]
FIG. 1 is a perspective view of an optical component manufactured by a method for manufacturing a resin molded product according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view for explaining a method for producing a resin molded product according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view for explaining a method for producing a resin molded product according to an embodiment of the present invention.
FIG. 4 is a cross-sectional view for explaining a method for producing a resin molded product according to an embodiment of the present invention.
FIG. 5 is a cross-sectional view for explaining a method for producing a resin molded product according to an embodiment of the present invention.
FIG. 6 is a perspective view of a resin molded product according to a conventional example.
FIG. 7 is a cross-sectional view for explaining a problem in a method of manufacturing a resin molded product according to a conventional example.
FIG. 8 is a cross-sectional view for explaining problems in a method for producing a resin molded product according to a conventional example.
FIG. 9 is a cross-sectional view for explaining a step portion provided in a hole for positioning an optical fiber in a resin molded product.
[Explanation of symbols]
31 Optical component 33 Molded product body 35 Horizontal block 37 Vertical block 39 Horizontal hole 41 Vertical hole 43 Half mirror 45, 47, 49 Step part block 51, 53, 55 Small hole 51a, 53a, 55a Through hole 57 Mold 59 Cavity 61a, 61b, 62, 63 Pin 64 Pin edge 65 Punch 67, 69, 71 Punched portion 72, 73, 74 Optical fiber 75, 76, 77 Front of step block

Claims (2)

A resin having a molded product body, an insert part inserted into the molded product body, a first hole formed in the molded product body and extending to the insert part, and a stepped portion protruding from the inner surface of the first hole. In the method of manufacturing a molded product, a step of arranging an insert part at a predetermined position of a cavity, a step of bringing a tip of a first hole forming member into contact with the insert part to form the first hole, and the first Projecting a second hole forming member having a smaller cross-sectional area than the first hole forming member into the cavity along with the first hole forming member to form a second hole smaller than the hole cross sectional area; A step of filling the resin, and after the resin filled in the cavity is cured, a portion of the molded product body where the second hole is formed is punched and dropped into the first hole, and the second hole is opened. Method for producing a resin molded article characterized by comprising a step of forming a stepped portion around. 2. The method of manufacturing a resin molded product according to claim 1, wherein the first hole forming member has a cylindrical tip, and an edge of the cylindrical tip of the first hole forming member is brought into contact with the insert part. A method for producing a resin molded product.

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