JP2563109Y2 - Light leakage prevention structure for vehicle lighting - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a vehicular lamp in which a flexible hook fixed to a lens is engaged with an engaging claw of a lamp housing and the lens is mounted on the lamp housing. The present invention relates to a structure for preventing light leakage that passes through a light emitting device.

[0002]

2. Description of the Related Art FIG. 2 is a sectional view showing a conventional example of a vehicular lamp in which an inner lens is mounted on a lamp housing 1 using a flexible hook (called a lance). 2 is a colorless outer lens, around which a red lens 3 is integrally formed by a two-color molding method. An orange inner lens 4 is arranged inside the colorless outer lens 2. 5 is a light source bulb. A leg 2a is integrally formed around the colorless outer lens 2, and the leg 2a is inserted into the seal groove 1b of the lamp housing, and is bonded with a hot melt 6 which is a heat-softening adhesive. Further, a flexible hook (lance) 4a fixed to the orange inner lens 4 is engaged with an engaging claw 1a formed integrally with the lamp housing 1. FIG. 3 is a schematic cross-sectional view of the vicinity of an inner lens (orange lens) mounting structure including a flexible hook 4a and an engagement claw 1a in this type of vehicle lighting device. It is not a realistic projection because it is schematically drawn for the sake of understanding the structural functions.

[0003]

In the conventional inner lens mounting structure shown in FIG. 3, a light-shielding coating 7 is applied to a flexible hook (lance) 4a so as to prevent light leakage from the mounting structure. However, stray light (uncontrolled light) in the direction of arrow a is reflected on the inner surface of the lamp housing 1 as indicated by arrow b, and further reflected as indicated by arrow c to leak light. This light leakage (arrow c) passes through the red lens 3 and is colored red and harmful. Referring to FIG. 3, it is considered that the light leakage of the arrow c should be blocked by the engaging claw 1a. However, as described below with reference to FIG. 4, both sides of the engaging claw 1a (in FIG. The light leaks through the front side). FIG. 4 is a schematic perspective view of the vicinity of the engaging claw 1a. An engaging claw 1a is formed integrally with the lamp housing 1. In order to injection-mold this part with a synthetic resin material, a slide mold that slides in the direction of arrow d must be provided. For this reason,
A notch 1c corresponding to the slide type (not shown) is formed. Through this notch 1c, both sides of the engaging claw 1a
Light leaks through both sides of the engaging claw 1a as indicated by chain arrows c and c '. In the present invention, the both sides of the engaging claw mean both sides with respect to the light path direction of light leakage.

The present invention has been made in view of the above circumstances, and in a vehicle lamp to which an inner lens is attached by a flexible hook (lance), light leakage from both sides of a claw engaging with the hook is described. The purpose is to prevent it.

[0005]

In order to achieve the above object (preventing light leakage from the vicinity of the engagement projection), the structure of the light leakage preventing structure according to the present invention comprises a flexible hook fixed to the lens and a lamp housing. In the vehicle lighting device engaged with the engaging claw fixed to the vehicle, light shielding ribs are provided on both sides of the engaging claw.

[0006]

According to the above construction, even if there is a notch (notch 1c in the lamp housing) around the engaging claw for mounting the lens for the slide die for forming the engaging claw. Since the light path passing through the notch is blocked by the light-blocking rib, there is no risk of light leakage.

[0007]

FIG. 1 is a schematic perspective view showing one embodiment of the present invention. This embodiment is an improvement obtained by applying the present invention to the conventional example shown in FIG. 4, and the same reference numerals in FIG. 4 denote the same or similar components as those in the conventional example. It is. Next, a difference between FIG. 1 and FIG. 4, that is, matters improved by applying the present invention will be described. In FIG. 1, the components added to FIG. 4 (conventional example) are shown with spots in order to make the configuration of the present invention easier to read. On both sides of the engaging claw 1a, light shielding ribs 8, 8 'are provided (positioned so as to block the optical paths c, c' of light leakage in the conventional example of FIG. 4).
This prevents light leakage through the optical path indicated by the arrows c and c '. In this embodiment, a light shielding wall 9 is further provided at the edge of the notch 1c. By providing such a light shielding wall,
Since the leakage of light that has been repeatedly reflected in the lamp housing is also prevented, the effect of preventing light leakage is further ensured.
A similar light-shielding wall 9 '(indicated by a phantom line) may be provided at a position symmetrical to the light-shielding wall 9 described above. Practical effects are sufficient if they are provided only on the near edge.

[0008]

According to the present invention, when the present invention is applied to a vehicular lamp having a structure in which a flexible hook fixed to a lens is engaged with an engaging claw of a lamp housing, light leakage passing through the vicinity of the above-described engaging claw can be prevented. Is prevented.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing one embodiment of a light leakage prevention structure of a vehicle lamp according to the present invention.

FIG. 2 is a cross-sectional view of a conventional example of a vehicular lamp in which a lens is mounted by a flexible hook.

FIG. 3 is a cross-sectional view for explaining a problem (causing light leakage) in a vehicle lamp of a conventional example.

FIG. 4 is a schematic diagram for explaining a state in which light leakage occurs near an engaging claw in the above conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Lamp housing, 1a ... Engagement claw, 1b ... Seal groove, 2 ... Colorless outer lens, 2a ... Leg, 3 ... Red lens, 4 ... Orange inner lens, 4a ... Flexible hook, 5 ... Light source bulb, 6 ... hot melt, 7 ... light shielding coating, 8, 8 '... light shielding rib, 9, 9' ... light shielding wall.

Claims (1)

(57) [Scope of request for utility model registration] 1. A vehicular lamp in which a flexible hook fixed to a lens is engaged with an engaging claw fixed to a lamp housing, wherein light-blocking ribs are provided on both sides of the engaging claw. Light leakage prevention structure for vehicle lighting.