CN113103532A

CN113103532A - Injection molding part

Info

Publication number: CN113103532A
Application number: CN202110018649.6A
Authority: CN
Inventors: 久野修平; 小菅守
Original assignee: Koito Manufacturing Co Ltd
Current assignee: Koito Manufacturing Co Ltd
Priority date: 2020-01-09
Filing date: 2021-01-07
Publication date: 2021-07-13
Anticipated expiration: 2041-01-07
Also published as: JP2021109369A; CN113103532B; CN214926817U; JP7399715B2

Abstract

The invention provides an injection molding, which can inhibit the generation of sink marks of the injection molding provided with a design part with a specified shape and a partition wall which is close to the design part with a narrow space. The injection-molded article provided by the present invention has a design portion that constitutes a desired appearance or function in a predetermined shape recessed toward the back surface, and an opening portion that communicates with a narrow space is provided in a non-design portion that is provided adjacent to the design portion via the narrow space by being continuously folded back from the periphery of the design portion. In the molding die, the opening portion serves as a joint portion between the cavity-side die and the core-side die. By providing the joining portion in the mold convex portion corresponding to the narrow space, the heat release property of the mold is improved, overheating is prevented, and the occurrence of sink marks is suppressed.

Description

Injection molding part

Technical Field

The present invention relates to an injection-molded article, and more particularly, to an injection-molded article in which a narrow space is formed between continuous partition walls by the partition walls.

Background

Patent document 1 discloses a vehicle lamp including a combination lamp of a tail lamp, a stop lamp, and a turn signal lamp. A first lamp chamber having a reflector for a tail lamp and a stop lamp and a second lamp chamber for housing a unit for a turn signal lamp are integrally molded as a lamp body of a vehicle lamp.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2002-

Disclosure of Invention

Problems to be solved by the invention

However, since the two lamp chambers are formed integrally in close proximity to each other, a space formed by the reflector of the tail lamp and the stop lamp and the partition wall of the turn signal lamp that is continuous and folded back with the reflector becomes very small. Since a cooling circuit cannot be provided in the narrow portion in the molding die, there is a problem that sink marks (stripe patterns) are generated in the reflector due to insufficient cooling.

The present invention has been made in view of the above circumstances, and an object thereof is to suppress the occurrence of sink marks in an injection molded article having a design portion of a predetermined shape and an off-design portion such as a partition wall that is close to the design portion with a narrow space therebetween, such as the reflector described above.

Means for solving the problems

In order to solve the above problem, an injection-molded article according to an aspect of the present invention is configured to include a design portion having a predetermined shape recessed toward a back surface to form a desired appearance or function, and an opening portion communicating with a narrow space is provided in a non-design portion provided adjacent to the design portion via the narrow space by being continuously folded back from a peripheral edge of the design portion.

According to this aspect, the opening portion serves as a joint portion between the cavity-side mold and the core-side mold in the molding die. Since the opening portion communicates with the narrow space, a bonding surface is provided on the molding die convex portion corresponding to the narrow space. The molding die convex part is formed into a slender shape reflecting a narrow space between the design part and the non-design part folded back from the design part. In the conventional method in which a cooling circuit for cooling the mold cannot be provided in the elongated portion and the opening portion does not exist, heat is easily accumulated in the mold, which causes insufficient cooling of the mold. By providing the opening portion in the molded article, the joining portion is provided in the mold convex portion, and the temperature of the elongated mold convex portion can be transmitted to the other mold via the joining portion. Further, since the cooling circuit can be provided in the vicinity of the other mold side having no molding die convex portion, the cooling function can be applied to the molding die convex portion via the joining portion, and the temperature of the molding die convex portion can be lowered. By providing the opening portion in the molded article as a heat release mechanism of the molding die, overheating of the molding die (molding die convex portion) is prevented, and generation of sink marks is suppressed.

In one aspect, the opening has a substantially rectangular shape having two opposing sides, and the opening is formed in a step portion of the non-design portion such that the two opposing sides are offset in opposite directions in the thickness direction.

According to this aspect, the opening portion having such a shape is formed as a so-called notch in the molding die. In general, the opening is undercut, but forming the opening in this way eliminates the need for complicated processing and steps such as die cutting, and enables easy molding.

In one aspect, the opening is formed in the vicinity of a boundary between the design portion and the opening folded back from the design portion.

According to this aspect, since the tip end portion of the mold convex portion corresponding to the folded portion in the narrow space is a position where heat is most likely to accumulate in the mold, the opening portion is formed in the vicinity of the boundary in order to cool this position, thereby enhancing the cooling effect.

In one aspect, the opening is formed in a portion that is not easily visible when the design portion is viewed from the front, and is blocked by the design portion, or in a non-visible portion that is blocked by a blocking member.

According to this aspect, the opening can be provided at a position where the opening is not easily visible, and the influence on the appearance can be minimized.

In one aspect, the opening is formed in an upright wall portion of a frame body that is formed continuously from the design portion and opens to the front.

According to this aspect, the influence on the housing can be minimized without interfering with the design portion.

In one aspect, the design portion and the non-design portion are configured to be closer to each other toward a folded-back portion that forms a boundary.

According to this aspect, the narrow space is configured to be narrower toward the folded portion, and the mold convex portion corresponding to the narrow space is also formed to have a tapered shape, and the opening portion is formed therein, so that the cooling effect of the mold is extremely high.

In one aspect, the design portion is a first lamp chamber having an opening on a front surface thereof through which the irradiation light of the first light source accommodated therein is emitted, the non-design portion has a surface as a standing wall that is continuous and folded back from a peripheral edge of the first lamp chamber, the non-design portion is a second lamp chamber having an opening on a front surface thereof through which the irradiation light of the second light source accommodated therein is emitted, and the two lamp chambers are integrally formed in proximity to each other with the narrow space interposed therebetween. According to this aspect, since the two lamp chambers can be integrally molded in the combination lamp including the plurality of light sources, such as the vehicle headlamp, the number of components can be reduced, and the molding cost and the number of assembly steps can be reduced.

The design portion is an optical reflector that reflects light forward, and the non-design portion is a bracket member or a standing wall of a lamp chamber that is continuous from an end of the optical reflector and is folded back to the back surface to stand upright.

The reflector and the bracket or the lamp chamber can be integrally molded while suppressing sink marks, and the molding cost and the assembling man-hour can be reduced.

Effects of the invention

As is apparent from the above description, according to the present invention, it is possible to suppress the occurrence of sink marks in an injection molded article having a design portion with a predetermined shape and a partition wall that is close to the design portion with a narrow space therebetween.

Drawings

Fig. 1 is a front view of a vehicle headlamp provided with a bracket unit (injection-molded article) according to a first embodiment.

Fig. 2 is a longitudinal sectional view of the vehicle lamp.

Fig. 3A and 3B are partial cross-sectional views illustrating an opening of the carriage unit according to the first embodiment.

Fig. 4 is a mold of the cradle unit according to the first embodiment.

Fig. 5A and 5B show the thermal state of the mold of the tray unit according to the first embodiment. Fig. 5A shows a mold of a molded article having no opening as a conventional example, and fig. 5B shows a mold of the present embodiment having an opening.

Fig. 6 is a cross-sectional view of a vehicle headlamp provided with a bracket unit (injection molded article) according to a second embodiment.

Fig. 7A and 7B are partial cross-sectional views illustrating an opening of the cradle unit according to the second embodiment.

Fig. 8 shows a mold and a molding method of a carrier unit according to a second embodiment.

Fig. 9 is an explanatory diagram for explaining a formation position of the opening portion of the carriage unit.

Description of the reference numerals

10. 110: a bracket unit; 22: a reflector; 22 a: a reflective surface; 41a, 141 a: a partition wall; 42. 142: an opening part; 42a, 42b, 42c, 42 d: an edge; 43: a step portion; RH, RL: a lamp chamber; SR1, SR 2: narrow space.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. The embodiments are not intended to limit the invention, but to exemplify the invention, and all the features and combinations thereof described in the embodiments are not necessarily essential to the invention. In the drawings, the description will be given with respect to the respective directions (upper: lower: left: right: front: rear: Up: Do: Le: Ri: Fr: Re) with reference to the state of the vehicle on which the vehicle headlamp is mounted as viewed from the front. The ratios of the thickness, width, and length of the respective members do not reflect actual ratios, but schematically show the contents of the structures.

(first embodiment)

Fig. 1 and 2 are front views of a vehicle headlamp 1 including a bracket unit 10 as an injection-molded article according to a first embodiment of the present invention, and fig. 2 is a cross-sectional view taken along line II-II of fig. 1.

The vehicle headlamp 1 includes a lamp body 2, a front cover 3, a low beam unit LU, a high beam unit HU, and a bracket unit 10. The lamp body 2 has an opening at the front. The front cover 3 is made of light-transmitting resin, glass, or the like, and is attached to an opening of the lamp body 2.

The low beam unit LU and the high beam unit HU are disposed in a lamp room formed by the lamp body 2 and the front cover 3, and are held by the bracket unit 10.

The low beam unit LU includes a projection type optical unit Lo2 including a light source 21 as a light emitting element, a reflector 22, and a projection lens 24.

As the Light source 21, a semiconductor Light Emitting element such as an LED (Light Emitting Diode), an LD (Laser Diode), or an EL (Electro Luminescence), a bulb, an incandescent lamp (halogen lamp), or a discharge lamp (discharge lamp) can be used.

The reflector 22 is configured to guide light emitted from the light source 21 in a desired direction, and has an inner surface serving as a predetermined reflection surface 22 a. Light emitted from the light source 21 is reflected forward by the reflecting surface 22a of the reflector 22, and is emitted forward of the vehicle through the projection lens 24, thereby forming a desired light distribution. The projection lens 24 is fixed to the carriage unit 10 by a support member not shown.

The low beam unit LU is a triple optical unit including an optical unit Lo2 and optical units Lo1 and Lo3 having the same configuration, and forms low beam light distribution in front of the vehicle by the three optical units Lo1, Lo2 and Lo 3.

The high beam unit HU is a drawing unit configured to form a predetermined shape and light distribution by light emitted forward, and can form not only a high beam light distribution but also a variable light distribution in accordance with the driving situation of the vehicle and the surrounding situation.

The high beam unit HU includes a laser light source 31, a scanning mechanism 32, a collimator lens 33 that condenses light emitted from the laser light source 31 and emits the condensed light into the scanning mechanism 32, a control device 34 that controls the scanning mechanism 32 and the laser light source 31, and a projection lens 35. These components are attached to the frame 36 by a support mechanism not shown.

The scanning mechanism 32 has a mirror 32a supported so as to be capable of rotating incident light in the biaxial direction, and forms a desired drawing pattern by scanning the reflected light while rotating the mirror 32 a. The desired drawing pattern is projected forward of the vehicle through the projection lens 35, and a desired light distribution pattern is formed.

In the present embodiment, the scanning mechanism 32 is used as the variable light distribution device in the high beam unit HU, but other devices capable of forming an arbitrary pattern with arbitrary light, such as an LED array, a pixel optical device, and a light deflection device, may be used. Further, there is no problem in using a reflector type optical unit, a projection type optical unit, or the like that forms only a desired light distribution in the low beam unit LU and the high beam unit HU.

The extended reflector 5 is a shielding member that shields unnecessary portions. The low beam unit LU and the high beam unit HU are shielded from mechanical parts, fixing parts, and the like by the extension reflector 5.

(cradle unit 10)

The cradle unit 10 will be described in detail. Fig. 3A and 3B are perspective views of a part of the tray unit 10, and are obtained by cutting the tray unit 10 with a predetermined width around the line II-II in fig. 1. Fig. 3A is a rear upper perspective view, and fig. 3B is a front lower perspective view.

As shown in fig. 2, 3A and 3B, the bracket unit 10 forms a lamp chamber RL for the low beam unit LU and a lamp chamber RH for the high beam unit HU, and is attached to the lamp body 2 by three alignment bolts E at a bracket portion 10a and a bracket portion 10B provided vertically. By rotating the respective alignment bolts E, the optical axes of the respective units are adjusted in the horizontal direction and the vertical direction.

In the present embodiment, a part of the bracket unit 10 constitutes the reflector 22 of the low beam unit LU. Further, a high beam unit HU is incorporated in a lamp chamber RH in which a partition wall 41a that is continuous from a lower end portion of the reflector 22 and is folded back is formed as a standing wall.

The lamp chamber RH is defined by a partition wall 41a, a partition wall 41b, and the like that are erected forward from the vertical portion 41c of the holder unit 10. A partition wall, not shown, is also present in the left-right direction of the vertical portion 41 c. Hereinafter, the member defining the lamp chamber RH as the pocket portion having the front opening is referred to as only the partition wall 41 unless a specific portion is specified.

The bracket unit 10 is a member formed by integrally molding a bracket member for holding and fixing the reflector 22 (lamp chamber RL), the partition wall 41 defining the lamp chamber RH, the low beam unit LU, and the high beam unit HU. By providing one multifunctional component, the number of components can be reduced, and manufacturing cost and assembly cost can be suppressed.

Here, since the partition wall 41a is configured to be continuous from the lower end of the reflector 22 and folded back, a narrow space SR1 is formed on the back side of the tray unit 10 between the reflector 22 and the partition wall 41 a.

A stepped portion 43 is provided in the partition wall 41a, and an opening 42 communicating with the narrow space SR1 is formed in the stepped portion 43.

The opening 42 is provided in the partition wall 41a in a rectangular shape, but is not provided in a through hole in a plane, and is configured such that the thickness direction of one side of the rectangular shape is opposite to the thickness direction of the other side by the step portion 43. That is, although the

rectangular sides

42a, 42b, 42c, and 42d are formed by the lower surface 41aa of the partition wall 41a to form the outer shape of the opening 42, the thickness direction of the side 42a having the ridge line of the stepped portion 43 as one side is set to be the lower direction, and the thickness directions of the remaining three

sides

42b, 42c, and 42d are set to be the upper direction with reference to the lower surface 41 aa.

(mold of the first embodiment: notch mold)

A method of molding the bracket unit 10 having the above-described shape will be described. Fig. 4 is a mold 50 of the cradle unit 10. Is a cut-out at a location corresponding to line II-II of fig. 1.

As shown in fig. 4, the mold 50 is composed of a cavity-side mold 60 and a core-side mold 70. The cavity-side mold 60 and the core-side mold 70 are disposed in a state of facing each other, and are clamped. In the clamped state, a molding space MS1 corresponding to the shape of the carrier unit 10 is defined inside the mold 50. The resin member heated to a predetermined melting temperature is injected into the molding space MS1 to mold the carrier unit 10.

On the opposite surface (molding surface) of the core-side mold 70, a convex portion 71 corresponding to the narrow space SR1 is provided. In the present embodiment, the surface 71a constituting a part of the convex portion 71 and the surface 60a constituting a part of the molding surface of the cavity-side mold 60 are configured to be partially joined. The opening 42 is formed in the tray unit 10 in a so-called notched shape by the joint 51 of the two.

In the mold 50, a cooling circuit 80 for cooling and solidifying the injected resin member is provided. The cooling circuit 80 is configured to flow a cooling fluid such as water to cooling holes provided in the cavity-side mold 60 and the core-side mold 70, and to indirectly cool and solidify the resin member filled in the molding space MS1 by cooling the mold 50. The cooling circuit 80 is appropriately provided to make the temperature distribution of the molding surfaces of the cavity-side mold 60 and the core-side mold 70 uniform.

(Effect)

The operational effect of the present embodiment in which the opening 42 is provided in the tray unit 10 will be described with reference to fig. 5A and 5B. Fig. 5A shows a temperature distribution of a mold 950 of a molded article without an opening in a partition wall that is continuous from a reflector and folded back as a conventional example, and fig. 5B shows a temperature distribution of the mold 50 of the cradle unit 10 of the present embodiment.

As shown in fig. 5A, the mold 950 is composed of a cavity-side mold 960 and a core-side mold 970. A convex portion 971 is provided at the core-side mold 970, and the convex portion 971 corresponds to a narrow space formed between a reflector portion and a partition wall continuous to the reflector portion. The projection 971 does not have a sufficient thickness or width for providing a cooling hole, and does not have a sufficient space for disposing the cooling circuit 80 in the vicinity, and therefore the cooling circuit 80 cannot be provided. When the melted resin member is injected, the melted resin member is surrounded by the high-temperature resin member, and the temperature of the projection 971 becomes extremely high. Since the cooling circuit 80 cannot be provided in the projection 971, the temperature of the mold 950 cannot be lowered, and sink marks (stripe patterns) are generated in the molded article due to overheating. Since the narrow space is formed near the back surface of the reflector, if sink marks are generated in the reflector, a defect occurs in light distribution. In order to solve this problem, in the present embodiment, the opening 42 is provided in the cradle unit 10.

As shown in fig. 5B, since the reflector 22 of the bracket unit 10 and the partition wall 41a are continuous and disposed very close to each other, the convex portion 71 of the core-side mold 70 corresponding to the narrow space SR1 formed therebetween also has a very fine shape. Therefore, the thickness and width of the cooling hole are not sufficient for the projection 71, and the cooling circuit 80 cannot be provided, as in the conventional product.

However, unlike the mold 950 as the conventional example, since the opening 42 is formed in the molded article, the joining portion 51 is provided in the mold 50. Since the convex portion 71 of the core-side mold 70 and the cavity-side mold 60 are directly connected to each other at the joint portion 51, heat of the convex portion 71 moves to the cavity-side mold 60 (see white arrows in the figure). Since the mold 50 is made of a metal member, the thermal conductivity is high, and the convex portion 71 of the core-side mold 70 is cooled through the joint 51 by the cooling circuit 80 of the cavity-side mold 60 disposed in the vicinity of the joint 51.

Accordingly, since the temperature of the projection 71 is reduced, the temperature of the entire mold 50 is reduced and kept uniform, and therefore, the occurrence of sink marks in the reflector 22 can be suppressed without overheating. The reflecting surface 22a of the reflector 22 is subjected to metal vapor deposition after injection molding.

Since the convex portion 71 has a shape with a thin tip end in accordance with the shape of the reflector 22, heat is accumulated toward the tip end (see fig. 5A), and the cooling effect is preferable if the opening 42 is provided in the vicinity of the boundary folded back from the reflector 22.

In addition, since the mold is opened after the resin member is completely solidified after cooling, and the time required for cooling the melted resin member is a large proportion of the molding cycle, the conventional product requires a long molding time and low productivity since the heat of the convex portion 971 of the mold 950 is sufficiently reduced. By providing the opening portion 42 in the tray unit 10, that is, by providing the engaging portion 51 in the mold 50 for molding the tray unit 10, the cooling rate of the mold 50 becomes fast, the molding time is shortened, and the productivity is improved.

(second embodiment)

Next, a second embodiment will be explained. Fig. 6 is a cross-sectional view of a vehicle headlamp 101 including a bracket unit 110 as an injection-molded article according to a second embodiment. Fig. 7A and 7B are partial perspective views of the carriage unit 110. Fig. 7A and 7B are obtained by cutting out the tray unit 110 with a predetermined width around the line II-II in fig. 1, as in fig. 3A and 3B. Fig. 7A is a rear upper perspective view, and fig. 7B is a front lower perspective view. The same reference numerals are given to the same components as those of the first embodiment, and the description thereof will be omitted.

The vehicle headlamp 101 has the same configuration as the vehicle headlamp 1 except that the bracket unit 110 has a different configuration.

The bracket unit 110 includes a partition wall 141a that is continuous from a lower end of the reflector 22 that opens forward and is folded back. The partition wall 141a is a standing wall defining the lamp chamber RH.

Since the reflector 22 and the barrier ribs 141a are disposed very close to each other, a narrow space SR2 is formed therebetween.

Here, the opening 142 communicating with the narrow space SR2 is formed in the partition wall 141a as in the first embodiment, but unlike the first embodiment, the step portion is not provided in the partition wall 141a, and therefore the opening 142 is configured as a through hole provided in the flat partition wall 141 a.

(mold of the second embodiment: slide mold)

A method of molding the bracket unit 110 having the above-described shape will be described. Fig. 8 is a mold 150 of the carriage unit 110.

As shown in fig. 8, the mold 150 is composed of a cavity-side mold 160 and a core-side mold 170 having a slide member 161. The slide member 161 is provided as an insert of the cavity-side mold 160 and configured to be slidable in the direction of arrow DR1 (vertical direction) with respect to the cavity-side mold 160 as a main body. The slide member 161 is provided for molding the opening portion 142 in the carriage unit 110.

In addition, a convex portion 171 corresponding to the narrow space SR2 is provided on the molding surface of the core-side mold 170.

When the cavity-side mold 160 and the core-side mold 170 are closed, the slide member 161 is moved upward, and the front end portion is held in contact with the convex portion 171 of the core-side mold 170. Inside the mold 150, a molding space MS2 corresponding to the shape of the carrier unit 110 is defined, and a resin member heated to a predetermined melting temperature is injected into the molding space MS2, thereby molding the carrier unit 110.

As described above, the convex portion 171 corresponding to the narrow space SR2 is surrounded by the molding space MS2 into which the resin member heated to the melting temperature flows, and the heat is easily accumulated, and the cooling circuit 80 cannot be provided because the tip is thin and long.

In the present embodiment, the following configuration is adopted: by using the slide mold, the slide member 161 is brought into contact with the convex portion 171, and the heat of the convex portion 171 is transmitted from the contact portion 172 (in the direction of the white arrow in the figure), whereby the temperature of the convex portion 171 is lowered. The slide member 161 and the cavity-side mold 160 are made of a metal member, and the convex portion 171 is cooled by the slide member 161 via the cooling circuit 80 of the cavity-side mold 160 disposed in the vicinity of the slide member 161 and the contact portion 172.

After the mold 150 is sufficiently cooled, the slide member 161 is moved downward and separated from the convex portion 171, and when the mold 150 is lowered to a position not in contact with the resin member, the mold 150 is opened and the resin molded article (carrier unit 110) is taken out.

When the opening 142 can be made large, such as when the resin mold is large, the cooling circuit 80 may be provided in the slide member 161. Further, a plurality of openings 142 may be provided in the carriage unit 110, and a plurality of slide members 161 may be used in the mold 150 to improve the cooling effect.

In the present embodiment, the reflector having a reflecting surface formed in a shape recessed toward the back surface and the partition wall of the lamp chamber continuous therewith and folded back toward the back surface are formed as a resin molded product, but the present invention can be applied to an integrally molded product having the same configuration, such as an extended reflector and a bracket member thereof, a parabolic reflector and a bracket member thereof, and the like.

In addition to preventing sink marks, the design portion having a desired appearance or function formed by a predetermined shape such as a reflector cannot be provided with an opening. By providing the opening at the non-design portion that is continuous and folded back from the periphery of the design portion, for example, at the position of the non-design portion that does not constitute the design portion, such as the bracket member or the standing wall, sink marks can be suppressed from being generated in the design portion.

(modification example)

The opening portion provided in the non-design portion of the integrally molded article having the above-described structure for releasing heat of the molding die is preferably a portion that is not easily visible to a user or a non-visible portion that is shielded by a shielding member. Fig. 9 shows, as an example, a relationship between mounting positions of the vehicle lamps LP and LP' and a line of sight of a user, and a description will be given of the relationship.

The vehicle lamp LP is mounted on the rear surface of the vehicle V, and includes a reflector unit 90 in which a parabolic reflector 91 and a bracket member 92 thereof are integrally molded in a lamp chamber. As in the above-described embodiment, the bracket member 92 of the reflector unit 90 is folded back from the peripheral edge of the parabolic reflector 91, and an opening 93 is formed in the bracket member 92.

The vehicle lamp LP is mounted on an upper portion of a rear surface of the vehicle V (for example, a high mount stop lamp or the like), and the bracket member 92 is formed on an upper portion of the parabolic reflector 91. In a state where the vehicle lamp LP is mounted on the vehicle V, even if the user is looking at the vehicle lamp LP and confirms it, the opening 93 provided in the bracket member 92 is shielded from sight by the parabolic reflector 91.

In addition, in the case where the vehicle lamp LP ' having the same configuration as the vehicle lamp LP is mounted at a relatively low position of the vehicle V (for example, a backup lamp or the like), in contrast to the above, the bracket member 92 ' is provided at the lower portion of the parabolic reflector 91 ' and the opening 93 ' is formed in the bracket member 92 ', whereby the opening 93 ' can be blocked by the parabolic reflector 91 '.

In this way, by providing the opening at a position where the molded article is not easily visible when the user looks at the front in a normal use state, the influence on the appearance due to the formation of the opening can be suppressed to the minimum.

Although the preferred embodiment and the modified examples of the present invention have been described above, the above embodiment is an example of the present invention, and these embodiments can be combined based on the knowledge of those skilled in the art, and such a form is also included in the scope of the present invention.

Claims

1. An injection-molded article characterized in that,

the injection-molded article includes a design portion having a desired appearance or function in a predetermined shape recessed toward the back surface, and an opening portion communicating with a narrow space is provided in a non-design portion provided adjacent to the design portion via the narrow space by being continuously folded back from a periphery of the design portion.

2. Injection molding according to claim 1,

the opening portion has a substantially rectangular shape having two sides facing each other,

in the step portion of the non-design portion, the opening portion is formed such that the thickness directions of the upper portion and the lower portion of the step portion to which the two opposing sides respectively belong are offset in opposite directions.

3. Injection molding according to claim 1 or 2,

the opening is formed in the vicinity of a boundary between the design portion and the opening folded back from the design portion.

4. Injection molding according to claim 1 or 2,

the opening is formed in a portion that is not easily visible when the design portion is viewed from the front, and is blocked by the design portion, or in a non-visible portion that is blocked by a blocking member.

5. Injection molding according to claim 1 or 2,

the opening is formed in a standing wall portion of a frame body that is continuously formed from the design portion and is open to the front.

6. Injection molding according to claim 1 or 2,

the design portion and the non-design portion are configured to be closer toward a folded-back portion that is a boundary.

7. Injection molding according to claim 1 or 2,

the design part is a first lamp chamber with an opening on the front surface for emitting the irradiation light of the accommodated first light source,

the non-design portion is a second lamp chamber having an opening on a front surface thereof through which light emitted from the second light source is emitted, and the two lamp chambers are integrally formed close to each other with the narrow space therebetween.

8. Injection molding according to claim 1 or 2,

the design is an optical reflector that reflects light forward,

the non-design portion is a bracket member or an upright wall of the lamp chamber that is continuously provided from an end of the optical reflector and is folded back to the back side to be erected.