JP2016029619A - Method for manufacturing extension, extension, and vehicular lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve molding property more than before.SOLUTION: An extension 4 includes: multiple side parts 41, ... defining an opening part 4a to which a reflector 3 is disposed; and a beam part 42 stretched between the multiple side parts 41, ... on a back side of the opening part 4a so as to be positioned backward of the reflector 3. The extension is molded by injecting a resin into a mold from a gate G provided in a position of the beam part 42.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an extension manufacturing method, an extension, and a vehicular lamp.

Conventionally, an extension used for a vehicular lamp is manufactured by molding a resin (see, for example, Patent Document 1). Since this extension is a design part, it is not preferable to set a gate (resin injection port) at the time of molding on the design surface because the appearance of the gate deteriorates due to molding marks.
Therefore, when almost the entire surface of the extension is a design surface, a side gate provided at the end of the extension is employed.

JP 2013-206835 A

  However, even when a side gate is used, for example, it is necessary to set the side gate while avoiding a sliding mold for hooks, or the molding trace remains at the end of the extension where the side gate is set. Therefore, the setting position of the side gate is also limited. For this reason, the side gate may have to be set at a position where molding control is relatively difficult, leading to deterioration of moldability.

  The object of the present invention is to solve the above-mentioned problems, that is, to improve the moldability as compared with the conventional art.

In order to achieve the above object, the invention described in claim 1
An extension manufacturing method in which an extension having an opening in which other parts are arranged is molded with resin,
The extension includes a plurality of sides defining the opening and a beam spanned between the plurality of sides on the back side of the opening so as to be located behind the other parts. Have
A resin is injected into a mold from a gate provided at the position of the beam portion.

The invention according to claim 2 is an extension,
It is manufactured using the method for manufacturing an extension according to claim 1.

The invention according to claim 3 is a vehicular lamp,
An extension according to claim 2;
A reflector which is housed from the front of the opening of the extension and whose rear surface is fixed to the beam portion;
It is characterized by providing.

The invention according to claim 4 is the vehicle lamp according to claim 3,
A housing that is directly fixed to the reflector and that is indirectly fixed to the extension via the reflector is provided.

According to the present invention, the extension is bridged between the plurality of sides defining the opening in which the other component is disposed and the plurality of sides on the back side of the opening so as to be located behind the other component. A resin is injected into a molding die from a gate provided at the position of the beam and molded.
As a result, in a product state in which other parts are incorporated into the extension, the beam part is covered with the other part and is not exposed to the front, so it is free on the beam part without worrying about deterioration of appearance due to molding marks. A gate can be placed. In the first place, the beam itself can be freely bridged between a plurality of sides.
Therefore, the molding control can be facilitated and the moldability can be improved as compared with the conventional case where the position of the gate is limited.

It is a disassembled perspective view of the principal part of the vehicle lamp in embodiment. It is the perspective view which looked at the extension and reflector with which the vehicle lamp in embodiment is equipped from the front side. It is the perspective view which looked at the extension and reflector with which the vehicle lamp in embodiment is equipped from the back side. It is sectional drawing in the IV-IV line of FIG. It is a perspective view for demonstrating the gate of the extension in embodiment. It is sectional drawing which shows the modification of the vehicle lamp in embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an exploded perspective view of a main part of a vehicular lamp 1 according to the present embodiment. FIGS. 2 and 3 are perspective views of an extension 4 and a reflector 3 provided in the vehicular lamp 1 as viewed from the front side and the rear side. 4 is a cross-sectional view taken along line IV-IV in FIG.
In the following description, “front”, “rear”, “left”, “right”, “upper”, and “lower” refer to the direction viewed from the vehicular lamp 1 unless otherwise specified. .

  As shown in FIGS. 1 to 3, the vehicular lamp 1 is a tail lamp mounted on the left side of the rear portion of a vehicle (not shown) in the present embodiment, and includes a housing 2 having an open front surface. The front opening of the housing 2 is covered with an outer lens (not shown), and the reflector 3 and the extension 4 are accommodated inside the lamp chamber defined by the housing 2 and the outer lens.

The reflector 3 is formed in a substantially rectangular shape when viewed from the front, and has a plurality of reflecting surfaces 31,. The reflector 3 reflects light from a light source (not shown) forward by a plurality of reflecting surfaces 31.
The reflector 3 is directly fixed to the housing 2 by a fixing portion (not shown), and is also directly fixed to the extension 4 as will be described later, and the extension 4 and the housing 2 are indirectly fixed.

  The extension 4 is a design part that decorates the peripheral edge of the vehicular lamp 1, and has an opening 4a at the center to which the reflector 3 is fitted. More specifically, the extension 4 has a plurality of side portions 41,... That define the opening 4a. In the present embodiment, as the plurality of side portions 41, ..., an upper plate portion 41a, a lower side portion. 41b, right side plate portion 41c and left side portion 41d.

In addition, a plurality of beam portions 42,... Mainly for fixing the reflector 3 are spanned between the plurality of side portions 41,. The plurality of beam portions 42 are provided on the back side (rear side) of the opening portion 4a so as to be located behind the reflector 3 accommodated in the opening portion 4a. A first beam portion 42a extending rearward from the upper and lower center of 41d, and a second beam portion extending substantially along the horizontal direction from the front end (rear end) of the first beam portion 42a to the inner surface of the right side plate portion 41c. 42b and a third beam portion 42c extending from the left and right center of the second beam portion 42b to the lower surface of the upper plate portion 41a substantially along the vertical direction.
The plurality of beam portions 42 are fixed to the reflector 3 as shown in FIG. Specifically, a concave portion 43 that opens forward is provided in the second beam portion 42b of the plurality of beam portions 42,..., And a bush 32 that extends from the rear surface of the reflector 3 is provided in the concave portion 43. The recessed portion 43 and the bush 32 are fastened with the screw 5 in the fitted state. Further, a pilot hole 44 is formed in the third beam part 42c of the plurality of beam parts 42,... And a boss 33 protruding from the rear surface of the reflector 3 is inserted into the pilot hole 44. The head of this boss 33 is crimped.
In addition, the bridge | crossover shape and quantity will not be specifically limited if the beam part 42 is spanned between the some side parts 41 and ... in the back | inner side of the opening part 4a so that it may be located in the back of the reflector 3. FIG. However, it is preferable that the crossing shape and quantity of the beam portions 42 are such that the flowability of the resin is good when the extension 4 is formed. Further, the fixing structure of the beam portion 42 and the reflector 3 is not limited to the above-described one (screw fixing or caulking), and may be in accordance with the shape of each other.

  Further, the extension 4 is a resin molded product formed by molding a resin with a molding die. As shown in FIG. 5, the gate G which is a resin injection port at the time of molding is a beam portion 42 (in this embodiment, the second beam Part 42b). That is, the extension 4 is molded by using a molding die (not shown) provided with a gate at a position to be the beam portion 42 and injecting resin from the gate into the molding die. The gate G shown in FIG. 5 is a molding mark of the gate of the molding die and is removed after molding. The position of the gate G is not particularly limited as long as it is set on any of the beam portions 42, and can be provided at a preferable position for improving the formability.

As described above, according to the present embodiment, the extension 4 includes the plurality of side portions 41,... That define the opening 4a in which the reflector 3 is disposed, and the opening 4a so as to be positioned behind the reflector 3. And a beam portion 42 spanned between the plurality of side portions 41... And resin is injected into the mold from the gate G provided at the position of the beam portion 42. Molded.
As a result, in the product state in which the reflector 3 is incorporated in the extension 4, the beam portion 42 is covered with the reflector 3 and is not exposed to the front, so that the appearance on the beam portion 42 can be reduced without worrying about deterioration in appearance due to molding marks. Thus, the gate G can be freely arranged. In the first place, the beam portion 42 itself can be freely bridged between the plurality of side portions 41.
Therefore, the molding control can be facilitated and the moldability can be improved as compared with the conventional case where the position of the gate is limited.

Further, since the reflector 3 accommodated in the opening 4a of the extension 4 from the front is fixed to the beam portion 42 on the rear surface, the fixing portion (the recess 43 and the lower hole 44) of the extension 4 is covered with the reflector 3. It will not be exposed forward.
In the conventional extension, fixing to other parts is performed by a fixing part (hook, screw boss, etc.) standing upright from the rear surface of the design surface, but there is a sink mark at the base end of this fixing part during molding. Since it tends to occur and deteriorates the appearance of the design surface on the front surface, the basic thickness including the base end portion is increased in order to prevent the occurrence of sink marks.
In this regard, in the present embodiment, since the fixing portion of the extension 4 is not exposed forward as described above, it is possible to reduce the thickness without worrying about the occurrence of sink marks at least in this portion.

  The embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention.

  For example, in the above embodiment, the beam portion 42 of the extension 4 and the reflector 3 are directly fixed. However, the extension 4 and the reflector 3 may be fixed via separate parts. For example, as shown in FIG. 6, a bush 62 and a boss 63 configured similarly to the bush 32 and the boss 33 of the reflector 3 in the above embodiment are attached to a bracket 6 (fixed structure is not shown) fixed to the rear surface of the reflector 3. The bush 62 and the boss 63 may be fixed to the recess 43 and the prepared hole 44 of the beam portion 42 of the extension 4 by screw fastening and caulking.

  In addition, the reflector 3 is arranged in the opening 4a of the extension 4. However, as long as the other parts arranged in the opening 4a cover the front of the beam portion 42, the lamps other than the reflector 3 are used. It may be a part.

  In addition, although the vehicular lamp 1 is a tail lamp, the vehicular lamp according to the present invention is not limited to the tail lamp, and can be applied to various vehicular lamps having extensions formed with openings. .

1 Vehicle lamp 2 Housing 3 Reflector (other parts)
32 bush 33 boss 4 extension 4a opening 41 side 42 beam G gate

Claims (4)

An extension manufacturing method in which an extension having an opening in which other parts are arranged is molded with resin,
The extension includes a plurality of sides defining the opening and a beam spanned between the plurality of sides on the back side of the opening so as to be located behind the other parts. Have
A method for manufacturing an extension, comprising injecting resin into a mold from a gate provided at a position of the beam portion.   An extension manufactured using the extension manufacturing method according to claim 1. An extension according to claim 2;
A reflector which is housed from the front of the opening of the extension and whose rear surface is fixed to the beam portion;
A vehicular lamp characterized by comprising:   The vehicular lamp according to claim 3, further comprising a housing that is directly fixed to the reflector and indirectly fixed to the extension via the reflector.

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