JP2000322917A - Lamp for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a lamp for a vehicle from fogging. SOLUTION: A prism part 7 is provided on an inner lens 6 so as to refract the light outgoing from a bulb 5 toward corner parts of a lamp chamber 4 and thus sufficient light is gathered at the corner parts of the lamp chamber 4 distant from the bulb 5, thereby preventing a lens 2 from fogging, Although this is a simple structure made up by providing the prism part 7 on the inner lens 6 so as to refract the light going out of the bulb 5 toward the corner parts of the lamp chamber 4, it can prevent the lens from fogging by gathering sufficient light at the corner parts of the lamp chamber 4 distant from the bulb 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp, and more particularly to a vehicular lamp having an excellent lens fogging prevention effect.

[0002]

2. Description of the Related Art In a vehicular lamp, moisture that has entered from the outside may condense on an extreme part (low-temperature part) in the lamp room and cause fogging. In order to increase the apparent quality of the lamp in which such fogging has been avoided, conventionally, for example, Japanese Unexamined Patent Publication No.
As disclosed in Japanese Patent Application Laid-Open No. 64304, there is an example in which a closed space that is closed with respect to a lamp room is provided at a fogging portion of a lens.

However, when the closed space is formed as described above, there is a problem that the structure of the lamp is complicated and the manufacturing cost is increased. In order to avoid fogging, it is effective to provide a ventilation hole in the lamp to improve the ventilation performance of the light room, but in this case, it is necessary to use a stepped lens or the like to make the ventilation hole less noticeable. For this reason, there is an inconvenience that the configuration of the lens is restricted.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has a simple structure for a vehicle lamp capable of reliably avoiding fogging in a lamp room without using a stepped lens or the like. The challenge is to provide

[0005]

In order to solve the above-mentioned problems, the present invention is characterized in that a prism portion for refracting light emitted from a bulb toward a corner of a lamp room is provided on an inner lens. .

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an external perspective view showing an embodiment of a vehicle lamp according to the present invention, and FIG.
FIG. 3 is an enlarged sectional view of a prism portion provided on the inner lens.

In these figures, a lamp 1 mounted outside a vehicle (not shown) includes a lamp body 3 covered with a lens 2 made of a transparent plastic material or the like, and a lamp room formed by the lens 2 and the lamp body 3. 4 is provided with a valve 5. A transparent inner lens 6 that is colorless or colored in an appropriate color is attached to the bulb 5 to enhance the appearance of the lamp 1.

In this embodiment, the prism portion 7 refracts the light emitted from the bulb 5 toward the corner of the lamp chamber 4, especially the lower corner of the lamp chamber 4 which is far from the bulb 5. Is provided on the lower surface of the inner lens 6,
Light with a small function and directed downward is focused on the lower corner portion of the lamp room 4.

Therefore, in addition to the light directly radiated from the bulb 5, the light refracted and guided by the prism portion 7 is radiated to the lower corner portion of the lamp chamber 4, so that the temperature of the lower corner portion increases. Clouding due to condensation is prevented.

The light refracted toward the lower corner of the lamp chamber 4 irradiates the lens 2 or the lower corner of the lamp body 3 as described above. For this reason, since the illuminance at the periphery of the lens 5, which tends to have low illuminance, is improved, the visibility of the lamp 1 is improved, and the appearance quality is improved.

In the above-described embodiment, a case in which ridges having a triangular cross section are juxtaposed on the lower surface of the inner lens 6 so that light directed downward is refracted toward the lower corner portion of the lamp room 4. Although described, the structure of the prism portion 7 is not necessarily limited to that of the embodiment, but may be any as long as it refracts light toward the corner of the lamp room 4 where fogging easily occurs.

[0012]

As is apparent from the above description, the present invention has a simple structure in which a prism portion for refracting light emitted from a bulb toward a corner of a lamp chamber is provided in an inner lens. Sufficient light can be collected at the corner of the lamp room far from the bulb to prevent fogging of the lens.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing an embodiment of a vehicle lamp according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged sectional view of a prism portion provided on the inner lens.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lamp 2 Lens 3 Lamp body 4 Light room 5 Bulb 6 Inner lens 7 Prism part

Claims (1)

[Claims] 1. A vehicle lamp including an inner lens for covering a bulb, wherein a prism portion for refracting light emitted from the bulb toward a corner of a lamp room is provided on the inner lens. Lamp.