JP2007052982A - Lens of lighting fixture for vehicle and molding method and molding device of lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens of a lighting fixture for vehicle capable of reducing a cost of a mold and raising outside appearance and to provide the molding method and molding device of the lens. <P>SOLUTION: A foot part 24 of the lens 2 for fitting to a recess 31a installed in a lens fitting part 31 of the lighting fixture 1 for vehicle is horizontally installed in the drawing out direction of a molding mold of the lens to prevent the formation of under cut in the foot part 24 during molding, and the lens 2 can be molded without requiring a slide mold. The lens 2 is constituted with a first lens part 21 in which the foot part 24 is projected, a second lens part 22 stacked so as to cover the whole of the first lens part 21, and a third lens part 23 formed with resin having color different from that of the first lens part 21, and since the first lens part 21 and the second lens part 22 are molded with dark color resin, the inside of the lens can not seen from the outside and good outward appearance is raised. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lens for a vehicle lamp, a molding method and a molding apparatus for the lens, and in particular, a technique for simplifying a mold structure.

  In general, in a lens of a vehicle lamp, for example, as shown in Patent Document 1, a plurality of colors are integrally formed, and a front part (4) facing forward and a front part (4) are formed. And a sealing leg (7) protruding perpendicularly to the lens surface is formed integrally with the peripheral portion of the lens surface (6). There is something. The seal leg (7) is provided for joining with the lamp body, and is formed of a portion (7W) formed of white resin and a portion (7r) formed of red resin. Regarding the molding of the lens seal leg (7), the movable mold (9), the first fixed mold (10) and the second fixed mold (14) are used, and the direction from the mold is removed. The portion where the undercut is formed is formed using a slide mold (11) supported so as to be movable by the movable mold (9).

  Further, in the method of molding using a slide mold, as shown in Patent Document 2, molding of a seal leg at a portion corresponding to the wraparound portion (4) and a seal leg at other portions is performed. By dividing the process, a line is not formed on the lens at the boundary between the slide mold and the mold, thereby improving the appearance.

JP 2000-254942 A JP 2001-79902 A

  As for the lens molding method, as shown in the lens of the vehicle lamp, the lens molding method and the molding apparatus of Patent Document 1 and Patent Document 2 above, the lens back surface is sealed at the lens wraparound portion. When molding the legs perpendicular to the back of the lens, there will be little sink marks on the lens surface facing the seal legs, but undercuts will be formed on the seal legs depending on the direction in which the lens is molded. . Therefore, as a method for removing the undercut portion, a molding method using a slide mold for the seal leg portion has been adopted.

  In addition, since the cost of the mold is increased when the slide mold is used, as a method of not using the slide mold, as shown in FIG. A method of forming such that the legs are horizontal with respect to the direction is conceivable. However, undercuts are not molded by this method, but the attachment part of the leg part becomes thick, so that the lens surface facing the leg part becomes sinked and the appearance of the lens deteriorates. I couldn't.

  The present invention has been made to solve the above-described problems, and can reduce the cost of a mold and can have a good appearance, and a lens and a molding method and molding apparatus for the lens. The purpose is to provide.

  In order to solve the above-described problem, the vehicle lamp lens according to claim 1 includes a housing attached to the vehicle body and a multilayered lens attached to the housing, and the housing is provided with a recess. The lens has a leg projecting on the back surface of the lens, and the lens leg is mounted on the concave portion of the housing. Among the first lens part provided so as not to form an undercut and the leg part of the lens being provided, and the second lens part formed by being laminated so as to cover the first lens part, the first lens part is provided. Both the first lens unit and the second lens unit or only the second lens unit are molded with dark resin, and the surface of the first lens unit is difficult to see from the surface of the lens. It is technically characterized by that.

  According to a second aspect of the present invention, there is provided a method for molding a lens for a vehicle lamp, comprising: a housing attached to a vehicle body; and a lens made of multilayer molding attached to the housing, wherein the housing is provided with a recess, and the lens A method for forming a lens for a vehicle lamp in a vehicle lamp, wherein a leg portion is provided on the back surface of the lens, and the leg portion of the lens is mounted in a concave portion of the housing. A first lens part provided so that an undercut is not formed when the leg part is molded, and a second layer resin is injected into the mold, And a step of forming a second lens portion by laminating so as to cover the surface of the first lens portion formed by resin injection.

  Further, the lens forming apparatus for a vehicle lamp according to claim 3 includes a housing attached to the vehicle body, and a lens made of multilayer molding attached to the housing, wherein the housing is provided with a recess, and the lens And a lens forming device for a vehicular lamp in a vehicular lamp, wherein a leg portion protrudes from a rear surface of the lens, and the leg portion of the lens is mounted in a recessed portion of the housing. A first mold for molding a first lens part provided so that an undercut is not formed at the time of molding, and a third lens part molded with a resin of a color different from that of the first lens part, and a second mold A second mold that molds a second lens part that is laminated so as to cover the surface of the first lens part of the layer, and the second mold has a surface of the second lens part, The first lens part and the front Wherein the cavity is provided so as to shape the stage in a position separating the third lens unit.

  According to the lens of the vehicular lamp according to claim 1, the slide mold is provided at the position of the leg portion when the lens is formed by providing the leg portion protruding from the back surface of the lens so that the undercut is not formed at the time of molding. There is no need to use the metal mold, and the cost of the mold can be suppressed.

  In addition, when the first lens portion is molded, the leg portion is provided so as to protrude outward at an acute angle with respect to the back surface of the lens, so the surface facing the leg portion of the first lens portion is also shown in FIG. As shown in the figure, there are sink marks, and scratches and the like at the time of molding are on the surface, but since the first lens part and the second lens part are molded with a dark resin, there are sink marks and scratches from the appearance. It becomes invisible, and the appearance of the lens can be kept good.

  Further, when the lens is attached to the lens attachment portion of the housing, the leg portion of the lens is engaged with the concave portion provided in the lens attachment portion. The second lens part formed by laminating the lens part so as to cover the lens part is molded with a dark-colored resin for both the lenses or only the second lens part, so that the leg part cannot be seen from the appearance. It is like that. For this reason, the after-welding when attaching a leg part to a recessed part can be hidden.

  According to the method for molding a lens for a vehicle lamp according to claim 2, the leg projectingly provided on the back surface of the lens is not formed with an undercut at the time of molding (with respect to the direction in which the lens mold is removed). By providing horizontally, it is not necessary to use a slide mold at the position of the leg, and the cost of the mold can be suppressed. Further, after molding the first lens part, the second lens part is laminated and molded so as to cover the entire surface of the first lens part, thereby covering the sink marks and scratches on the surface of the first lens part. It is possible to improve the appearance of the lens.

  According to the lens molding device for a vehicle lamp according to claim 3, the second mold for molding the second lens unit is provided on the surface of the second lens unit, the first lens unit and the third lens unit. By forming a cavity so as to mold the step at the position that partitions, the step is molded at the position where the first lens part and the third lens part are partitioned so that sink marks occur due to the wide molding of the resin. Thus, sink marks generated on the surface of the second lens portion can be prevented, and the appearance of the lens can be improved.

  An embodiment of the present invention will be described with reference to the drawings. 1 to 7 show a vehicular lamp according to the present invention. FIG. 1 is a schematic view of a vehicular lamp 1 according to the present invention, in which (a) shows the front side and (b) shows the back side. 2 is a front view of the vehicular lamp 1 according to the present invention, FIG. 3 is a side view of the vehicular lamp 1, FIG. 4 is a cross-sectional view taken along line AA in FIG. 2, and FIG. is there. As shown in FIG. 1A, the vehicular lamp 1 is formed of a lens 2 and a housing 3 attached to the vehicle body.

  The lens 2 is formed of resin parts of three colors in two layers, and a black transparent first lens part 21, a red transparent second lens part 22, and a pink transparent third lens part 23 are integrally molded. The leg portion 24 is integrally projected on the back surface of the first lens portion 21 so as to protrude outward at an acute angle with respect to the back surface of the lens. If it does in this way, it can prevent that an undercut is formed in the position of leg 24 at the time of lens fabrication mentioned below. The second lens unit 22 is laminated and molded so as to cover the entire first lens unit 21.

  The housing 3 is an integrally molded resin member having a lens attachment portion 31 and a vehicle body attachment portion 32, and a concave portion 31 a is provided on the periphery of the lens attachment portion 31. The recess 31 a can be engaged with a leg 24 provided on the back surface of the first lens portion 21 of the lens 2, and the leg 2 is engaged and welded to the recess 31 a so that the lens 2 is attached to the housing 3. It will be attached.

  The lens mounting portion 31 is provided with a valve mounting hole 33a for mounting a bulb 35 serving as a light source. A reflector is formed around the bulb mounting hole 33a so that light from the bulb 35 can be reflected to the lens side. 33 is provided. The valve 35 is attached to the valve attachment hole 33a by a socket 35a. The socket 35a is formed of a resin in a substantially cylindrical shape, and a claw portion 35b projects from the circumference of the socket 35a so that the socket 35a can be fixed to the valve mounting hole 33a.

  An extending portion 33 b is provided around the reflector 33, and an end portion of the extending portion 33 b forms an end portion of the lens mounting portion 31. The reflector 33 is provided with a first intermediate portion 33c and a second intermediate portion 33d, and the first intermediate portion 33c and the second intermediate portion 33d are provided so as to project close to the inner surface of the lens 2 and extend the extension. Three closed spaces D, E, and F are formed between the reflector 33 and the lens 2 by the portion 33b, the first intermediate portion 33c, and the second intermediate portion 33d.

  An isolation wall 34 is provided between the lens attachment portion 31 and the vehicle body attachment portion 32, and partitions the lens attachment portion 31 and the vehicle body attachment portion 32. Here, if the isolation wall 34 is provided with a ventilation hole for ventilating the inside of the lens mounting portion 31 (in the closed spaces D, E, F) to which the lens 2 is mounted, the inside of the lens mounting portion 31 (closed space D). , E, and F) are exchanged to prevent fogging and exhaust gas.

  A bolt mounting hole 32a is formed in the vehicle body mounting portion 32, and the vehicle lamp 1 is fixed to the vehicle body by inserting the bolt into the bolt mounting hole 32a and fixing the bolt to the vehicle body. In addition, an air vent hole 32b is formed in the vehicle body mounting portion 32, and serves as an air vent hole when the vehicle door is closed. In the vehicular lamp of the present invention, by providing the lens 2 in the housing 3 without providing the air vent hole, when the vehicular lamp is mounted, the air vent hole is not visible from the outside, and the appearance is improved. Yes.

  Next, the molding process of the lens 2 of the vehicle lamp 1 will be described.

  First, the first molding step for molding the first black transparent lens portion 21 and the pink transparent third lens portion 23, which is the first layer, will be described.

  FIG. 6A is an enlarged view of a main part of a mounting portion of the lens 2 and the housing 3 (C portion in FIG. 5), and FIG. 6B is a first mold for performing the first molding process of the lens 2. FIG. It shows the state of tightening. The first mold for performing the first molding step includes a movable mold 4 and a first fixed mold 5, and a first cavity 6 for injecting black resin into the first mold to mold the first lens portion. And the 2nd cavity 7 which inject | emits pink resin and shape | molds the 3rd lens part 23 is formed. As shown here, when the first lens portion 21 is molded by injecting the black resin into the first cavity 6, the leg portion 24 protruding from the first lens portion 21 is the same as the pulling direction of the movable mold 4. By molding in the direction (projecting so that it protrudes outward at an acute angle with respect to the back surface of the lens), molding can be performed without undercutting, and it is not necessary to use a slide mold as in the past. Cost can be reduced.

  After the black resin and pink resin injected into the cavities 6 and 7 are cooled and solidified, the movable mold 4 is moved in the direction of the arrow to open the mold. At this time, as in the description of FIG. 8, sink marks have occurred on the surface of the first lens portion 21 facing the leg portion 24, but the process proceeds to the next step without any problem. Further, in the mold opening, the first lens portion 21 and the third lens portion 23 are left in the movable die 4.

  Next, a second molding step for molding the second lens portion 22 that is the second layer, which is red and transparent, will be described.

  FIG. 7 shows a state where the mold is clamped in performing the second molding step. The movable mold 4 with the first lens portion 21 and the second lens portion 23 molded by the first molding step is brought into contact with the second fixed mold 8 to perform mold clamping. The movable mold 4 and the second fixed mold 8 constitute a second mold, and a third cavity 9 for molding the second lens portion 22 by injecting a red resin into the second mold is formed. The As shown here, since the red transparent second lens portion 22 is laminated so as to cover the black transparent first lens portion 21, the sink marks generated in the first lens portion 21 by the first molding step are It is hidden and only the surface of the second lens portion 24 can be seen from the appearance, and the lens 2 looks good.

  Here, in forming the second lens portion 22 in the second fixed mold 8, no sink marks are generated on the lens surface of the wide portion 25 between the first lens portion 21 and the third lens portion 23. A step 8a is provided so as to form the step.

  After the red resin injected into the third cavity 9 is cooled and solidified, the movable mold 4 is moved to open the mold, whereby the molded product, that is, the lens 2 of the vehicular lamp 1 is taken out.

  In the vehicular lamp and the vehicular lamp lens and the lens molding method and molding apparatus according to the present invention, the present invention can be applied not only to an automobile, but also to a lamp using a lens using a dark colored resin. The appearance on the exterior can be kept good.

1A and 1B are schematic views of a vehicular lamp according to the present invention, in which FIG. 1A shows the front side and FIG. 1B shows the back side. FIG. 2 is a front view of the vehicular lamp according to the present invention. FIG. 3 is a side view of the vehicular lamp according to the present invention. 4 is a cross-sectional view taken along line AA in FIG. 5 is a cross-sectional view taken along the line BB in FIG. FIG. 6A is an enlarged view of a main part of the lens and the housing mounting portion (C portion in FIG. 5), and FIG. 6B is a diagram illustrating the clamping of the first mold for performing the first molding process of the lens. It shows the state performed. FIG. 7 shows a state where the mold is clamped in performing the second molding step. FIG. 8 explains the position of sink marks generated during lens molding.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 Lens 3 Housing 4 Movable type 5 1st fixed type | mold 6 1st cavity 7 2nd cavity 8 2nd fixed type 8a Step part 9 3rd cavity 21 1st lens part (black transparent)
22 Second lens part (red transparent)
23 Third lens (transparent pink)
24 Leg portion 31 Lens attachment portion 31a Recess 32 Car body attachment portion 32a Bolt attachment hole 32b Air vent hole 33 Reflector 33a Valve attachment hole 33b Extension portion 33c First intermediate portion 33d Second intermediate portion 34 Isolation wall 35 Valves D and E , F closed space

Claims (3)

A housing attached to the vehicle body;
A multilayer molded lens attached to the housing,
The housing is provided with a recess, and a leg is provided on the back surface of the lens.
A lens for a vehicle lamp in a vehicle lamp formed by mounting a leg portion of the lens in a recess of the housing,
The lens leg is provided so that an undercut is not formed during molding,
Of the first lens portion provided with the leg portion of the lens and the second lens portion formed by being laminated so as to cover the first lens portion, the first lens portion and the second lens portion Both of the lens portions or only the second lens portion are molded with a dark resin, and the surface of the first lens portion is difficult to see from the surface of the lens. . A housing attached to the vehicle body;
A multilayer molded lens attached to the housing,
The housing is provided with a recess, and a leg is provided on the back surface of the lens.
A method for forming a lens of a vehicle lamp in a vehicle lamp in which a leg portion of the lens is mounted in a recess of the housing,
Injecting a first layer of resin into the mold, and molding the first lens portion provided so that an undercut is not formed during molding of the leg portion;
Injecting a second layer of resin into the mold, and laminating the second lens part to cover the surface of the first lens part formed by injection of the first layer of resin. A method for forming a lens for a vehicular lamp. A housing attached to the vehicle body;
A multilayer molded lens attached to the housing,
The housing is provided with a recess, and a leg is provided on the back surface of the lens.
An apparatus for molding a lens for a vehicle lamp in a vehicle lamp formed by mounting a leg portion of the lens in a recess of the housing,
A first lens portion provided so that an undercut is not formed during molding of the leg portion of the first layer and a third lens portion molded of a resin having a different color from the first lens portion are molded. A first mold;
A second mold for molding a second lens part that is laminated so as to cover the surface of the first lens part of the second layer,
The second mold is provided with a cavity so as to mold a step on the surface of the second lens portion and in a position that partitions the first lens portion and the third lens portion. A device for forming a lens for a vehicle lamp.

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