JP4166439B2 - Lamp - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lamp composed of a lamp body and a lens, and more particularly to a lamp that prevents the lamp body from being damaged when the lens is assembled to the lamp body.
[0002]
[Prior art]
FIG. 5A shows an example of a lamp that forms a lamp chamber by attaching a lens to the front opening of the lamp body, for example, a lamp for a vehicle such as an automobile. In the figure, a lamp body 101 is formed in a container shape having an open front, and a lens 102 is mounted on the front opening to form a lamp chamber. A light bulb socket 105 that supports a bulb (bulb) 104 is detachably attached to a socket mounting hole 111 provided on the back surface of the lamp body 101, and the bulb 104 is disposed in the lamp chamber. As a structure for mounting the lens 102 to the lamp body 101, a lance structure is adopted. In this lance structure, engagement holes or engagement recesses (hereinafter referred to as engagement holes) 112 are formed at a plurality of positions on the peripheral edge of the front opening of the lamp body 101, particularly at each of the upper edge portion and the lower edge portion. On the other hand, a lance piece 122 is formed so as to protrude rearward on a peripheral rib 121 projecting along the periphery of the lens 102, and a lance 123 that engages with the engagement hole 112 is formed on the lance piece 122. . Then, with the peripheral rib 121 of the lens 102 in contact with the peripheral portion 113 of the front opening of the lamp body 101, the lance piece 122 is elastically inward by pressing the lens 102 toward the lamp body 101. Each of the lances 123 is engaged with the corresponding engagement hole 112 by deformation, and the lens 102 is supported by the lamp body 101 by this engagement force.
[0003]
[Problems to be solved by the invention]
In such a conventional lamp, in order to enable engagement between the lance 123 and the engagement hole 112, the outer surface of the lance 123 protrudes outward from the inner surface of the peripheral edge 113 of the front opening of the lamp body 101. It is configured. Therefore, as shown by a chain line in the figure, when the lens 102 is mounted, the outer surface of the lance 123 is brought into contact with the inner surface of the peripheral edge 113 of the front opening of the lamp body 101, and the lens 102 is pushed in when the lens 102 is mounted. The two interfere with each other, and the surface decoration film such as the vapor deposition film or the coating film formed on the inner surface of the peripheral edge portion 113 may be damaged by abrasion or may be peeled off. Such scratches and film peeling are exposed to the outside along the periphery of the lens in a state where the lens is mounted, which causes a decrease in the appearance of the lamp.
[0004]
In order to solve such a problem, conventionally, as shown in FIG. 5B, a lance 114 projecting inwardly is formed at the peripheral edge of the front opening of the lamp body 101, while the peripheral edge of the lens 102 is formed. The structure which forms the engagement hole 124 in the rib 121 was considered. In this structure, when the lens 102 is mounted, the outer surface of the peripheral rib 121 of the lens 102 and the lance 114 come into contact with each other, and the peripheral rib 121 of the lens 102 is damaged. Since it is assembled in a state of being inserted inside the lamp, the appearance of the lamp is not deteriorated by the scratch. However, in this structure, when the lamp body 101 is resin-molded, an undercut occurs in the protruding portion of the lance 114, and a slider is necessary for the mold to realize release from the mold after resin molding. As a result, the mold becomes complicated and the lamp becomes expensive.
[0005]
An object of the present invention is to provide a lamp that achieves cost reduction by preventing the occurrence of scratches at the time of lens mounting and preventing the appearance from deteriorating without complicating the molding die. .
[0006]
[Means for Solving the Problems]
The present invention provides a lamp body including a lamp body in which a light source is disposed in a lamp chamber, and a lens that is attached to a front opening of the lamp body from the front of the lamp body and constitutes the lamp chamber. A body side engaging recess provided in one side surface portion of the front opening, and a body side engaging protrusion provided in the other side surface facing the body side engaging recess, wherein the lens is connected to the body side of the lamp body. A lamp body including an engagement protrusion piece having a lens side engagement protrusion that engages with the fitting recess; and an engagement recess piece having a lens side engagement protrusion that engages with the body side engagement protrusion. The length from the front end portion of the one side surface portion to the front end portion of the body side engaging recess is L1, and the length of the other side surface portion of the lamp body when the lens is attached to the lamp body Length from the front end to the tip of the engaging recess The when the L2, characterized satisfy the relation of L1> L2.
[0007]
In the present invention, it is preferable that the body side engaging recess is provided on an upper surface portion of the lamp body, and the body side engaging protrusion is provided on a lower surface portion of the lamp body. In this case, it is preferable that the body-side engagement protrusion provided on the lower surface portion of the lamp body is formed to extend in front of the lamp from the front end portion of the upper surface portion of the lamp body.
[0008]
According to the present invention, when the lens is mounted on the lamp body, the lens-side engagement protrusion of the engagement protrusion piece is inserted into the inner side of the front end of the one side surface of the lamp body from the state of the lens. It is possible to start mounting, and the interference between the lens-side engaging protrusion and the end of the lamp body is prevented, and the front end of the lamp body can be prevented from being scratched or peeled off. Can be prevented from decreasing. Further, the lamp body has a body side engaging protrusion only on one side surface, and the side surface on which the body side engaging protrusion is provided is formed to extend forward from the other side surface. As a result, molding and mold release are facilitated, a molding die for molding the lamp body can be simplified, and cost reduction can be realized.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially exploded perspective view of an embodiment in which the present invention is applied to a tail lamp of an automobile, and FIG. 2 is a longitudinal sectional view of the assembled state. In these drawings, a tail lamp TL includes a lamp-shaped lamp body 1 having a front opening 1a to form a lamp chamber therein, an inner lens 2 attached to the front opening 1a of the lamp body 1, And an outer lens 3 attached to the lamp body 1 further on the front side of the inner lens 2. Further, a socket mounting hole 11 is opened in the back surface portion 15 of the lamp body 1, and a light bulb socket 5 that supports the bulb 4 is detachably mounted in the socket mounting hole 11.
[0010]
In the lamp body 1, the upper surface portion 12 and the lower surface portion 13 are formed as flat surfaces parallel to the horizontal direction, and the lower surface front edge portion 13 a of the lower surface portion 13 is more than the upper surface front edge portion 12 a of the upper surface portion 12. A flange 14 is formed so as to protrude forward and to protrude outward along the peripheral edge of the front opening 1 a of the lamp body 1. Further, the back surface portion 15 of the lamp body 1 is formed in a paraboloid shape with the bulb 4 as a focal point. The inner surface 1b forming the lamp chamber of the lamp body 1 or the surface 14a of the flange 14 is deposited or coated with aluminum, and the inner surface 15a of the back surface 15 is formed as a light reflecting surface. The surface 14a of the flange 14 is formed as a decorative surface. Furthermore, rectangular engagement holes 16 penetrating in the plate thickness direction of the lamp body 1 are opened at two horizontal positions of the upper front edge portion 12a of the lamp body 1. On the other hand, the lower surface front edge portion 13a is provided with an inner surface concave portion 13b having a step shape along the opening edge, and at the two left and right positions in the horizontal direction of the inner surface of the inner surface concave portion 13b, a wedge shape is formed forward. The engaged lance 17 is integrally formed in a state protruding upward. The engagement lance 17 is formed at a position protruding forward of the lamp body 1 from the upper front edge portion 12a. Therefore, when the lamp body 1 is molded with a resin, a slider is attached to the molding die. The lamp body 1 can be molded and released without providing the lamp.
[0011]
The outer lens 3 is formed of a white transparent resin whose front lens portion 30 is slightly curved along the front opening 1a of the lamp body 1 or a slightly reddish transparent resin. The leg 31 is attached so as to cover the front opening 1a of the front lens unit 30 and provided on the peripheral edge of the rear surface side of the front lens unit 30 and is provided along the periphery of the front opening 1a of the lamp body 1. It is integrally attached to the surface of the flange 14 by welding.
[0012]
The inner lens 2 includes a front lens portion 20 made of a red resin having a required lens step that is not shown in the drawing, and covers the front opening 1 a of the lamp body 1. It is attached by an engagement hole 16 and an engagement lance 17. That is, the front lens portion 20 is formed in a shape corresponding to the front opening 1a of the lamp body 1, and a peripheral rib 21 protrudes rearward along the peripheral portion 20a on the back surface of the front lens portion 20. Is formed. And the lance piece 22 is formed in the upper edge part 21a of the said peripheral rib 21 in the position which opposes the said engagement hole 16 of the said lamp body 1 toward the back, respectively. A lance 23 having a wedge shape toward the distal end is integrally formed to protrude. Further, here, in order to facilitate elastic deformation of the lance piece 22 in the thickness direction, slits 24 are formed in the upper edge portion 21 a of the peripheral rib 21 along the both sides of the lance piece 22. In the lower edge portion 21b of the peripheral rib 21, rectangular engagement holes 25 are opened at positions facing the engagement lances 17 of the lamp body 1, respectively. Therefore, each area | region of the lower edge part 21b of the said peripheral rib 21 in which the said engagement hole 25 is opened functions as an engagement piece which has the engagement hole 25, respectively. When the rearward length of the peripheral rib 21 is short in the inner lens 2, an engagement piece protruding rearward from the peripheral rib 21 is formed, and the engagement hole 25 is formed in the engagement piece. You may make it form.
[0013]
Here, as shown in an enlarged view of the main portion in FIG. 3, the front lens portion of the inner lens 2 is in a state where the peripheral rib 21 of the inner lens 2 is inserted along the inside of the front opening 1 a of the lamp body 1. It is assumed that the peripheral edge 20a of 20 is mounted along the peripheral edge of the front opening 1a of the lamp body 1. At this time, the length from the front end portion P1 of the upper front edge portion 12a of the lamp body 1 to the front end portion P2 of the engagement hole 16 engaged with the lance 23 of the lance piece 22 provided in the inner lens 2 is L1. When the inner lens 2 is mounted on the lamp body 1, from the front end portion P3 of the lower surface front edge portion 13a to the front end portion P4 facing the lens rear of the lower edge portion 21b of the peripheral rib 21 of the inner lens 2 When the length is L2,
L1> L2
The lengths L1 and L2 are designed to satisfy the relational expression.
[0014]
When attaching the inner lens 2 formed in this way to the lamp body 1, first, as shown in FIG. 4A, the lance piece 22 of the upper edge portion 21a of the peripheral rib 21 of the inner lens 2 is fixed to the lamp. The body 1 is inserted along the inner surface of the upper front edge 12a. At this time, even if the mounting of the inner lens 2 is started by bringing the lance 23 into contact with the inner end of the front end portion P1 of the upper surface front edge portion 12a due to the relationship of L1> L2 described above, The lower edge portion 21b does not come into contact with the front end portion P3 of the lower surface front edge portion 13a of the lamp body 1. Therefore, it is possible to start mounting the inner lens 2 from a state in which the lance 23 is inserted to an inward position beyond the front end portion P1 of the upper surface front edge portion 12a. Therefore, as shown in FIG. 4B, when the inner lens 2 is pressed straight toward the inside of the lamp body 1, the lower edge portion 21b of the peripheral rib 21 is formed on the lower front edge portion 13a of the lamp body 1. When the inner lens 2 is inserted along the inner surface and a required amount is inserted, the lance 23 is engaged with the engagement hole 16 of the lamp body 1 at the upper edge portion 21a and is engaged at the lower edge portion 21b almost simultaneously. The hole 25 is engaged with the engagement lance 17 of the lamp body 1, and the inner lens 2 is attached to the lamp body 1 as shown in FIG.
[0015]
Accordingly, the inner surface of the front end portion P1 of the upper front edge portion 12a of the lamp body 1 interferes with the lance 23 provided on the upper edge portion 21a of the peripheral rib 21 of the inner lens 2, and the decorative surface or reflective surface near the front end portion P1. It is possible to prevent the aluminum film constituting the film from being scratched or peeled off. Thereby, even when the front end portion P1 of the upper front edge portion 12a of the lamp body 1 is exposed to the outside through the outer lens 3 along the periphery of the front lens portion 20 of the inner lens 2, the scratches on the aluminum film The appearance of the appearance due to film peeling does not deteriorate. When the inner lens 2 is mounted, the lance 23 is in contact with the inner surface of the upper front edge 12a in the region inside the front end P1 of the upper front edge 12a of the lamp body 1. Since the contact is not at the corner as in the front end portion P1, scratches and film peeling are unlikely to occur. Even if scratches or film peeling occurs, this area is not covered with the peripheral rib 21 of the inner lens 2 when the inner lens 2 is attached, so that it is not exposed to the outside. Further, when the lower edge portion 21b of the peripheral rib 21 of the inner lens 2 is inserted along the lower surface front edge portion 13a of the lamp body 1, the lower edge portion 21b contacts the front end portion P3 of the lower surface front edge portion 13a. However, since the lower edge portion 21b is not provided with a lance, scratches or film peeling may occur on the front end portion P3 of the lower surface front edge portion 13a or the aluminum film on the inner surface 1b of the lamp body 1 in the vicinity thereof. Will not occur.
[0016]
Here, in the said embodiment, although the engagement hole 16 is provided in the upper surface front edge part 12a of the lamp body 1, and the engagement hole 25 is provided in the lower edge part 21b of the peripheral rib 21 of the inner lens 2, these are provided. The engagement holes 16 and 25 can be formed as recesses that do not penetrate in the plate thickness direction as long as they engage with the lance. Moreover, in the said embodiment, although the engagement hole 16 is provided in the upper surface front edge part 12a of the lamp body 1, and the engagement lance 17 is formed in the lower surface front edge part 13a, this is the case of the lamp for motor vehicles. In many cases, the lower surface front edge portion 13a is formed to extend forward, and the lamp is observed from obliquely above the lamp, so that a scratch or film on the front end P1 of the upper surface front edge portion 12a of the lamp body 1 is observed. It is configured to prevent peeling. Therefore, when the shape of the lamp body is different depending on the location and state of the lamp, or when the form in which the lamp body is observed is different, it is engaged according to the state where it is most preferable to prevent scratches and film peeling. It is possible to change the position of the hole or the engagement lance.
[0017]
Moreover, although the said embodiment has shown the example which applied this invention to the vehicle lamp, it cannot be overemphasized that this invention can be applied similarly also to lamps other than those for vehicles. Further, the present invention is not limited to the structure for attaching the inner lens to the lamp body as in the above-described embodiment, and can also be applied as a structure for attaching the outer lens to the lamp body.
[0018]
【The invention's effect】
As described above, in the present invention, the length from the front end portion of one side surface portion of the lamp body to the body side engagement concave portion engaged with the lens side engagement protrusion provided on the lens is L1, and the lens When the length from the front end portion of the other side surface portion of the lamp body to the tip of the engaging recess piece is L2 when the lamp body is attached to the lamp body, the relationship of L1> L2 is satisfied. Since the lens is mounted on the lamp body, the lens is mounted from the state where the lens side engaging protrusion of the engaging protrusion piece is inserted inside the front end of one side surface portion of the lamp body. Thus, interference between the lens side engaging protrusion and the end of the lamp body can be prevented, scratches and film peeling at the front end can be prevented, and the appearance of the lamp can be reduced in appearance. Can be prevented.
[0019]
Further, in the present invention, the lamp body has a body side engaging protrusion only on one side surface, and the side surface portion on which the body side engaging protrusion is provided extends to a position ahead of the other side surface. By adopting the structure to be formed, molding and mold release at the time of molding the lamp body are facilitated, the molding die can be simplified, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a partially exploded perspective view of an embodiment in which the present invention is applied to a tail lamp.
FIG. 2 is a longitudinal sectional view of the assembled state of the lamp of FIG.
3 is a diagram showing a dimensional relationship of main parts of FIG. 2. FIG.
FIG. 4 is a diagram showing a state where an inner lens is attached.
FIG. 5 is a schematic cross-sectional view of each different example of a conventional lamp.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lamp body 2 Inner lens 3 Outer lens 4 Bulb 5 Light bulb socket 12 Upper surface part 12a Upper surface front edge part 13 Lower surface part 13a Lower surface front edge part 14 Flange 16 Engagement hole (body side engagement recessed part)
17 Engagement lance (Body side engagement protrusion)
20 Front lens part 21 Peripheral rib 21a Upper edge part 21b Lower edge part (engagement recessed piece)
22 Lance piece (engagement protrusion piece)
23 Lance (Lens side engagement protrusion)
24 Slit 25 Engagement hole (Lens side engagement recess)
P1 Front end portion of upper surface front edge portion P2 Front end portion of engagement hole P3 Front end portion of lower surface front edge portion P4 Front end portion of peripheral rib

Claims (3)

A lamp body comprising a lamp body in which a light source is disposed in a lamp chamber, and a lens that is attached to a front opening of the lamp body from the front of the lamp body and constitutes the lamp chamber, wherein the lamp body includes the front opening. A body-side engagement recess provided on one side surface and a body-side engagement protrusion provided on the other side surface opposite to the body-side engagement recess, and the lens is engaged with the body-side engagement recess of the lamp body. The one side surface of the lamp body, comprising: an engaging protrusion piece having a lens-side engaging protrusion to be engaged; and an engaging recessed piece having a lens-side engaging recess to be engaged with the body-side engaging protrusion. The length from the front end of the lamp to the front end of the body-side engagement recess is L1, and the lens is attached to the lamp body from the front end of the other side surface of the lamp body. The length to the tip of the engaging recess piece is L2. When the, lamp characterized by satisfying the relation of L1> L2. 2. The lamp according to claim 1, wherein the body-side engagement recess is provided on an upper surface portion of the lamp body, and the body-side engagement protrusion is provided on a lower surface portion of the lamp body. The said body side engaging protrusion provided in the lower surface part of the said lamp body is extended and formed ahead of the lamp rather than the front-end part of the upper surface part of the said lamp body. Light fixture.

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