JPS62287501A - Lamp apparatus for vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a vehicular lamp, and more particularly to a direct-light type vehicular lamp having a Fresnel lens.

[Conventional technology]

Conventional vehicle lights of this type generally include a housing, an inner lens and an outer lens of a Fresnel lens disposed in the front opening of the housing, and a light chamber disposed within a light chamber defined by the Fresnel lens and the housing. It is equipped with a valve. The effect will be explained below.

First, when a bulb is lit, direct light from the bulb enters the Fresnel lens directly, is refracted or reflected by the Fresnel lens, and is emitted from the Fresnel lens to the outer lens almost parallel to the optical axis, and from the outer lens. It is emitted to the outside as diffused light.

[Problem that the invention seeks to solve]

However, the above-mentioned conventional vehicle lamp simply has a bulb disposed within a lamp chamber defined by a Fresnel lens and a housing.

When the housing is long and thin, the brightness near the bulb of the Fresnel lens (approximately the center of the Fresnel lens) is extremely high compared to the surrounding area. Therefore, there is a problem that the luminance of the entire lamp is non-uniform.

An object of the present invention is to provide a vehicle lamp in which the luminance of the entire lamp is made uniform.

[Means for solving problems]

The present invention is characterized in that a reflecting surface is provided on the wall surface of the housing to allow light from the bulb to enter the Fresnel lens.

[Effect]

According to the present invention, the light from the bulb can be made to enter the dark part of the Fresnel lens by the reflective surface provided on the wall surface of the housing, and the brightness of the Fresnel lens can be made uniform.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle lamp according to the present invention will be described below with reference to the accompanying drawings.

In the figure, reference numeral 1 denotes a housing, which has an elongated and thin box shape and is open at the front. 2
and 3 are a Fresnel lens inner lens and a fisheye lens 7 outer lens disposed in the front opening of the housing 1. Reference numeral 4 designates a bulb that is detachably attached to the center of the bottom of the housing 1 and disposed within the lamp chamber 10 defined by the housing 1 and the Fresnel lens 2. 5 is a plate provided with a large number of minute reflective surfaces 50, and the large number of minute reflective surfaces 50 on the left side of this plate 5 are
As shown in FIGS. 4 to 4, the focal point F is common, the radius of curvature is changed sequentially, and the lamp axis (the center line in the longitudinal direction of the housing 1 and the filament of the bulb 4 (not shown) is A paraboloid of revolution whose central axis is the axis m-m, which is inclined at an angle of 0 minutes from the plane (Figs. 2 and 3) and from the front (Fig. 4) with respect to Q-°C. It is formed into a sawtooth cross section. Also, although the reflective surface 50 on the right side of the plate 5 is omitted in one drawing, it also shares the above-mentioned one focal point F, has a radius of curvature that changes sequentially, and is furthermore It consists of a part of a paraboloid of revolution whose central axis is an axis tilted at an angle of 0 minutes in the opposite direction to that described above, and is formed to have a sawtooth cross section. The plate 5 thus formed is placed inside both the upper and lower wall surfaces of the housing 1, and the axis m - m of the large number of small reflective surfaces 50 on the left side of the plate 5 and the large number of small reflective surfaces 5 on the right side of the plate 5 are attached.
The shaft of 0 is mounted so as to be inclined by θ on both sides when viewed from the plane and from the front with respect to the lamp axis Q-Q.

The vehicle lamp of the present invention in this embodiment has the above-mentioned configuration, and its operation will be explained below.

First, when bulb 4 is turned on, direct light from bulb 4 (
It is shown by broken lines in FIGS. 5 and 6. ) A directly enters the Fresnel lens 2, is refracted or reflected by the Fresnel lens 2, and is emitted from the Fresnel lens 2 to the outer lens 3 side approximately parallel to the optical axis n-n, and from the outer lens 3 becomes diffused light. It is emitted outside as.

On the other hand, light b (indicated by solid lines in FIGS. 5 and 6) incident from the bulb 4 on a large number of minute reflecting surfaces 50 is reflected by the reflecting surfaces 50 and is θ with respect to the lamp axis Q-Q. It enters the dark part of the Fresnel lens 2, that is, the peripheral part of the Fresnel lens 2, approximately parallel to the axis m-m tilted by the amount of
The light is emitted from the 7 outer lens 3 side almost parallel to the optical axis n-n.

The light is emitted from the outer lens 3 as diffused light.

In this way, the light beams from the bulb 4 can be reflected by a large number of minute reflective surfaces 50 and can be made to enter the dark area at the periphery of the Fresnel lens 2, and the brightness of the Fresnel lens 2 can be made uniform. Therefore.

The brightness of the entire lamp can be made uniform.

Further, in the above-described embodiment, by using a heat-resistant material for the plate 5, the heat resistance of the housing 1 is increased, and a low-cost material can be used for the housing 1.

In addition, in the above-mentioned embodiment, a large number of minute reflective surfaces 5
Although the plate 5 having the number 0 is provided inside both the upper and lower wall surfaces of the housing 1, it may be provided inside both the left and right wall surfaces, or may be provided inside the upper, lower, left, and right wall surfaces.

Further, the size, number, and shape of the reflecting surfaces 50 are not particularly limited.

Further, in the above embodiments, a double lens structure has been described, but a single lens structure may also be used.

〔Effect of the invention〕

As is clear from the above, the vehicle lamp of the present invention has a reflecting surface on the wall of the housing that allows light from the bulb to enter the Fresnel lens. The light from the bulb can be made to enter the dark part of the Fresnel lens, and the brightness of the Fresnel lens can be made uniform. Therefore, the brightness of the entire lamp can be made uniform.

[Brief explanation of drawings]

The attached drawings show one embodiment of the vehicle lamp of the present invention.
The figure is an exploded perspective view, Figure 2 is an explanatory diagram showing the configuration of the reflective surface, Figure 3 is a plan explanatory diagram showing the optical path of reflected light,
The figure is a front explanatory view showing the optical path of reflected light, FIG. 5 is a front explanatory view showing the optical path of direct light and reflected light, and FIG. 6 is a perspective view showing the optical path of direct light and reflected light. be. 1...Housing, 2...Fresnel lens, 4...
・Bulb, 5...Plate, 50...Reflection surface, Ω-
2...Lamp shaft, m-m...rotation axis, n-n...optical axis.

Claims (1)

[Claims] 1. In a vehicle lamp equipped with a housing, a Fresnel lens disposed in the front opening of the housing, and a bulb disposed in a light chamber defined by the Fresnel lens and the housing, the bulb is attached to the wall of the housing. A vehicular lamp characterized by being provided with a reflective surface that allows light to enter a Fresnel lens.