JPH0116247Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field of the Invention> The present invention relates to a signal light for a vehicle, such as a rear combination lamp attached to the rear of an automobile and a front combination lamp attached to the front.

<Prior art and its problems> As a conventional vehicle signal light, one having a structure as shown in FIG. 5, for example, is known. To explain the structure of this signal light, a is a lamp holder b
The lamp housing has a bulb c attached thereto, f is a front lens attached to the opening of the lamp housing a, and the front lens f consists of an inner lens d and a colored outer lens e.

By the way, in the case of such a vehicle signal light, when sunlight hits the front lens f, the sunlight passes through the outer lens e and the inner lens d and reaches the inside of the light chamber g, and the inside of the light chamber g and the inner lens. It is reflected by d and comes out through the outer lens e again, but especially because the outer lens e is colored, the sunlight sometimes causes false lighting that looks as if it is being lit. . This false lighting may cause subsequent drivers to misidentify the signal light, leading to a serious accident. Also,
A signal light that is equipped with such an inner lens d and that collimates the light from the bulb c is more expensive than a signal light that is equipped with a reflector behind the bulb c and uses this reflector to collimate the light from the bulb c. There was a problem that the difference between the lens surface illuminance near the optical axis X and the lens surface illuminance at the peripheral area was large, and the lens surface could not be illuminated uniformly when the light was turned on.

<Purpose of the invention> In view of the problems of conventional vehicle signal lights, the present invention is designed to prevent false lighting from occurring even when sunlight hits the signal light, and to reduce the illuminance of the lens surface by the light source bulb. An object of the present invention is to provide a vehicle signal light having a substantially uniform structure.

<Structure of the invention> In order to achieve the above object, the vehicle signal light according to the invention includes an inner lens in the opening of the housing where the bulb is installed, and an outer lens disposed to cover the inner lens. A signal light for a vehicle is provided with a front lens consisting of a plurality of fisheye lenses formed on the inner lens, and a plurality of planes between the inner lens and the outer lens through which the light flux transmitted through the inner lens is transmitted. and intermediate lenses each having a prism surface part connected from each side of the plane part and having a predetermined angle with respect to the plane part and totally reflecting incident light from the outside, and The fisheye lens is characterized in that the curvature of the fisheye lens increases as the distance from the optical axis of the bulb increases.

<Embodiment of the invention> Hereinafter, an embodiment of the vehicle signal lamp according to the invention will be described with reference to FIGS. 1 to 4.

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the vehicle signal light according to the present invention, in which 1 is a lamp housing made of synthetic resin, one end of which is open, and the other end has a socket insertion hole 1A in the rear wall 1a. have. A reflector 1B is formed on the inner surface of the rear wall 1a of the housing 1, and a socket 3 to which a light source bulb 2 is attached is attached, and a smoke-like colored inner lens 4 and an intermediate lens 5 are attached to one open end side. After being arranged, an outer lens 6 is further attached to cover the intermediate lens 5. The colored inner lens 4 has a plurality of fisheye lenses 4A on the side facing the intermediate lens 5, and a Fresnel lens 4B on the side facing the light source bulb 2.
is formed. Further, the surface of the intermediate lens 5 facing the outer lens 6 is formed as a flat surface, and the surface facing the inner lens 4 is approximately parallel to the optical axis 0 of the light source bulb 2, as shown in detail in FIG. A plurality of flat parts 5 that are provided at right angles and that can transmit the light beam that has passed through the inner lens 4.
1, and the periphery is cut leaving the flat part 51, so that prism surfaces are connected from each side 51A of the flat part 51 and are formed at a predetermined angle with respect to the flat part 51. A plurality of 52 are consecutively provided. The fisheye lens 4A provided in the inner lens 4 is configured such that the curvature of the lens becomes larger as the distance from the optical axis 0 increases. The optical system formed in this way has a lamp chamber 7 as shown in FIG.
The direct light from the inner light source bulb 2 and the luminous flux A once reflected by the reflector 1B are reflected by the inner lens 4.
It passes through the inside and is converged by the fisheye lens 4A, and the plane part 5
1, the light beam A that entered the flat portion 51 passes through the intermediate lens 5 to reach the outer lens 6, and further passes through the outer lens 6 to reach the outside of the lamp. Therefore, outside the lamp, light source bulb 2
The light is colored by the inner lens 4 and can be visually recognized as a colored lighting state.
As mentioned above, the fisheye lens 4A of the inner lens 4 is formed so that the curvature increases as the distance from the optical axis 0 increases. Since the amount of light bundled on the flat part 51A increases as the distance from 0 increases, the light from the light source bulb 2 is approximately uniformly irradiated onto the surface of the outer lens 6, making it visible from the outside. The brightness of the outer lens 6 appears to be approximately uniform. Conversely, for example, when sunlight is incident on the outer lens 6, the light B transmitted through the outer lens 6 and incident on the intermediate lens 5 is totally reflected by the prism surface 52 in substantially the direction from which it came. The light chamber 7 passes through the inner lens 4.
Return to the outside without reaching the inside. Therefore, the smaller the flat part 51 is, the more difficult it is for the outside to see the colored light from the inner lens 4 when the bulb 2 is turned on. The effect of preventing false lighting can be obtained. In addition, by changing the curvature of the fisheye lens 4A of the inner lens 4 so that it becomes larger as it goes away from the optical axis 0, the outer lens 6
The brightness of the images can be averaged.

In the above embodiment, the curvature of the fisheye lens 4A of the inner lens 4 is gradually and continuously increased as the distance from the optical axis 0 increases, but for example, as shown in FIG. Of course, it is always good to vary the curvature for each group.

<Effects of the invention> As explained above, in the vehicle signal light according to the invention, when sunlight enters the outer lens, it passes through the inner lens and enters the lamp chamber, and the light that enters the lamp chamber is The light that enters the outer lens is completely reflected in the direction from which it came from by the intermediate lens placed in front of the inner lens. , colored false lighting does not occur. or,
In conventional vehicle signal lights, the outer lens was colored, which created an imbalance with the lenses in other lighting equipment, but with this structure, the inner lens is colored, and the outer lens is not colored. Since the inner lens can be made to have the same color as the lens of other lamps, or the inner lens can be made to have the same color as the lens of other lamps, the appearance can be improved. Furthermore, since the curvature of the fisheye lens of the inner lens is changed so that it increases as the distance from the optical axis increases, there is an effect that uniform light distribution can be obtained.

[Brief explanation of the drawing]

1 to 3 relate to an embodiment of the vehicle signal light according to the present invention, FIG. 1 is a longitudinal sectional view of the signal light, and FIG. 2 is a perspective view showing only the intermediate lens shown in FIG. 1 in detail. , FIG. 3 is a schematic diagram showing the optical path system of the signal light shown in FIG. 1, FIG. 4 is a plan view showing a modification of the intermediate lens, and FIG. 5 is a longitudinal sectional view showing a conventional vehicle signal light. . 1...Housing, 4, 14...Inner lens, 6...Outer lens, 2...Light source bulb, 4A...Fisheye prism, 5...Intermediate lens,
51... Plane portion, 52... Prism surface portion.

Claims (1)

[Scope of utility model registration request] A vehicle signal light is provided with a front lens consisting of an inner lens and an outer lens disposed to cover the inner lens in an opening of a housing in which a bulb is attached, wherein a plurality of fisheye lenses are formed on the inner lens. and a plurality of flat parts that transmit the light beam that has passed through the inner lens between the inner lens and the outer lens, each of which is connected from each side of the flat part and has a predetermined angle with respect to the flat part. and an intermediate lens having a prism surface portion that totally reflects incident light from the outside, and the curvature of the fisheye lens increases as it goes away from the optical axis of the bulb. Signal lights for vehicles.