JP2543003B2 - Pseudo lighting prevention lens for signal light - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pseudo-lighting prevention lens for a signal light, which is intended to prevent reflected light generated in the signal light due to sunlight such as Seiyo and to make clear the contrast due to light and darkness of lighting and extinction. It is a thing.

[0002]

2. Description of the Related Art In the rapid car society, traffic signal lights play an increasing role in smooth road traffic. Traffic lights need to be reliably recognizable by the driver of the vehicle in any environment. As is well known, a traffic signal light is a self-luminous type using a light bulb, and has a feature that relative brightness is increased when ambient lighting is dark and bright recognition is possible. However, this may lead to difficulty in recognition if the ambient illumination is bright from a different viewpoint. The actual problem is when the sunlight shines directly on the center of the signal light. As the case of incidence at a right angle, there are Asahi and Seiyo, which causes a so-called pseudo-lighting phenomenon in which a signal lamp that is turned off is visually recognized as if it were turned on.

Therefore, as a means for eliminating this kind of pseudo lighting phenomenon, a light-shielding lens for a signal lamp of Japanese Utility Model Laid-Open No. 54100/1993 has been filed. In this arrangement, a large number of cylindrical condenser lens elements having a predetermined curvature are formed in an array on the back side of a lens formed of a translucent material between a front lens and a light source, and the condenser lenses are formed on the front side of the lens. In this configuration, a diffusing lens having each converging portion as a transmitting portion is formed corresponding to the element, and a light shielding film is adhered between the diffusing lenses. That is, the bulb light from the light source is condensed and emitted by the condenser lens element, the sun rays are blocked by the light shielding film, and diffused into the signal lamp by the diffusion lens element to prevent the pseudo lighting. is there.

[0004]

However, in the light-shielding lens having the above-described structure, when the sun rays are radiated from the front when the light is turned off, the sunlight incident on the concave continuous lens element is linear. Since the light enters the signal lamp, is diffused by the reflecting mirror in the signal lamp, and is emitted again through the condenser lens element, pseudo lighting is caused, and at the same time, the diffuse lens element itself causes surface reflection, and There is a problem that it is almost impossible to identify the off state of the signal lamp due to the synergistic effect with the lighting. Therefore, there is only an effect as a pseudo lighting prevention when the sun rays are incident on the light shielding lens at a certain angle.
Alternatively, there is a problem that it is impossible to prevent the pseudo lighting due to the sunlight rays incident from the front such as the sunrise. That is, in order to prevent the above phenomenon, the sunlight that is the external light is blocked as much as possible,
Moreover, it is important to emit the internal light from the bulb as efficiently as possible. However, these requirements are reciprocal laws, and although various improvements have been made so far, signal lights having a significant difference have not yet been developed. Therefore, in order to solve the above problems, it is an object of the present invention to provide a pseudo lighting prevention lens for a signal lamp that can block sunlight and efficiently emit internal light.

[0005]

The above object of the present invention can be achieved by an apparatus having the following configuration. That is, the gist of the invention is to form curved bodies whose optical axes coincide with each other on both sides of a transparent plate-like lens substrate so that their peripheral portions are in close contact with each other in a longitudinally and laterally chained manner. The pseudo lighting prevention lens for a signal lamp is characterized in that the distance from the top of the curved body is within 1.5 to 3 times the diameter of the curved body. Furthermore, by forming a valley portion where the peripheral edge of each curved surface body on the light source side of the lens substrate intersects in a concave groove shape, or by forming a light through hole for directly emitting the light beam on the light source side without refracting, The shadow of the valley is reduced, the brightness from the light source is increased, and the viewing angle is widened. The distance between the top surface of the curved body on both sides of the lens substrate is limited to 1.5 times to 3 times the diameter of the curved body (hereinafter referred to as “diameter”). 5
In the case of less than 2 times, the focus of the light ray from the light source side is outside the curved surface body, the expansion ratio of the light is reduced and the brightness cannot be increased, and in the case of 3 times or more, the light is excessively dispersed and similarly. The brightness cannot be increased. Then, as a result of various experiments, it was found that the brightness was highest when the curved body was spherical and the distance between the tops thereof was 2.2 times the diameter of the spherical body.

[0006]

FIGS. 7 and 8 are explanatory views of the action of incident or outgoing rays of light in the first embodiment. The parallel rays a of the sun that enter the pseudo lighting prevention lens 1 in parallel are
.. are refracted within the curved surfaces 3, 3, ... On the sunlight side A to form a focus within the lens substrate 2, and are reduced to an extremely small size and refracted again within the curved surfaces 3, 3, ... On the light source side B. Since it is diffused into the signal lamp as a parallel reduced light beam, it is possible to prevent pseudo lighting. Since the light beam b from the light source side B is turbulent, it is focused at each point on the curved surface bodies 3, 3, ... On the light source side B, and again the curved surface bodies 3, 3, on the sunlight side A are again focused.
..Emitted after being refracted inside, expanded and diffused.

Next, FIGS. 9 and 10 are explanatory views of the operation in the second embodiment, in which the parallel rays a of the sun correspond to those in the first embodiment.
As described in detail above, since it is diffused in the signal lamp, it is possible to prevent the pseudo lighting, and the light beam b from the light source side B is an irregular light, and each curved surface body 3, 3, on the light source side B is ..Focus at each point inside, and again curved surfaces 3, 3 on the sunlight side A
.. are refracted and expanded / diffused inside, and by making the valley portion 4 on the light source side B the concave surface portion 5, the diffused ray b incident on the concave surface portion 5 is refracted and diffused. The boundary surface between the curved bodies 3, 3, ... Therefore, the brightness is increased and the viewing angle is increased.

11 and 12 are explanatory views of the operation in the third embodiment. As described in detail in the first embodiment, the parallel rays a of the sun are diffused in the signal lamp and the light penetrating hole 6 directly. The transmitted parallel rays a of the sun minimize the brightness by reducing the diameter of the light through hole 6 on the sunlight side A to the minimum and by mounting the pseudo lighting prevention lens 1 while tilting it forward and downward. be able to. Further, the irregular ray b from the light source side B is focused on each curved surface body 3, 3, ... On the light source side B, and refracted again at each point on each curved surface body 3, 3 ,. The light beam b that is expanded and diffused and is directly incident on the light through hole 6 penetrating the valley portion 4 on the light source side B is directly emitted to the sunlight side A, so that the brightness is increased and There is no boundary surface between each curved surface body 3, 3, ....

FIGS. 13 and 14 are diagrams for explaining the operation in the fourth embodiment. As described in detail in the first embodiment, the parallel rays a of the sun can be diffused in the signal lamp to prevent the pseudo lighting. it can. Further, the irregular ray b from the light source side B is focused at each point in each curved surface body 3, 3, ...
The light ray b that is refracted again in the curved surfaces 3 on the sunlight side, is expanded and diffused, and is directly incident on the light insertion hole 6 ′ formed in the valley portion 4 on the light source side B. , The light is refracted and diffused from the tip end surface of the light insertion hole 6 ′ and is emitted, so that the brightness is not lowered and the curved surface bodies 3, 3 ,.
・ The interface between and disappears. FIG. 15 is an explanatory view showing a mounting state of the pseudo lighting prevention lens 1, in which the pseudo lighting prevention lens 1 is provided between the front lens 8 and the light source 9 which are mounted at the opening end of the signal light container 7. It is installed in a state of being tilted downward.

[0011]

EXAMPLE A pseudo lighting prevention lens for a signal lamp according to the present invention will be described in detail with reference to the drawings showing an example thereof. Example 1 As shown in FIGS. 1 and 2, the pseudo-lighting prevention lens 1 has a spherical body shape in which optical axes coincide with both side surfaces of the transparent plate-like lens substrate 2 on the sunlight side A and the light source side B, respectively. The curved surface bodies 3, 3, ... Are formed so as to project in a chain form in the vertical and horizontal directions in such a manner that their peripheral edges are in close contact with each other. Then, as shown in FIG. 3, the curved body 3 formed in the above-mentioned symmetrical shape,
The distance between the tops c of c 3 is 2.2 times the diameter of each curved body 3. Embodiment 2 As shown in FIG. 4, the valley portion 4 where the peripheral portions of the curved surface bodies 3, 3, ... On the light source side B intersect is defined as a concave surface portion 5.

Embodiment 3 As shown in FIG. 5, the curved surfaces 3, 3, ...
A valley portion 4 where the peripheral edges of the curved surface body 3 and each curved surface body 3 on the light source side B,
A light penetrating hole 6 is bored between the groove part 3 and the valley part 4 where the peripheral edges of the light penetrating part 3 intersect.
To the sunlight A, the diameters are sequentially formed to be narrowed. That is, it is intended to prevent direct incidence of sunlight and to allow as much light from the light source as possible to pass through. Example 4 As shown in FIG. 6, light is emitted from the valley portion 4 where the peripheral portions of the curved surface bodies 3, 3, ... On the light source side B intersect to the middle of the valley portion 4 of each curved surface body 3 on the sunlight side A. To insert the insertion hole 6 ',
Furthermore, the tip is formed into a concave surface.

[0013]

As described above, according to the present invention, the incident light of the sun such as the sun is condensed by each curved body,
By dispersing, it becomes possible to prevent the pseudo lighting and to radiate the emitted light from the light source without lowering the brightness. Further, by forming a concave groove or a light through hole or a light insertion hole in the valley portion of each curved body, it is possible to eliminate the boundary surface with each curved body, widen the viewing angle, and increase the brightness.

[0014]

[Brief description of drawings]

FIG. 1 is an explanatory plan view of a pseudo lighting prevention lens of the present invention.

FIG. 2 is a side view illustrating a pseudo lighting prevention lens of the present invention.

FIG. 3 is a partially enlarged side view of the first embodiment of the present invention.

FIG. 4 is a partially enlarged side view of the second embodiment of the present invention.

FIG. 5 is a partially enlarged side view of the third embodiment of the present invention.

FIG. 6 is a partially enlarged side view of the fourth embodiment of the present invention.

FIG. 7 is an explanatory diagram of the action of sunlight in Example 1 of the present invention.

FIG. 8 is a diagram illustrating a light source light action according to the first embodiment of the present invention.

FIG. 9 is a diagram for explaining the action of sunlight in Example 2 of the present invention.

FIG. 10 is a diagram illustrating a light source light action according to the second embodiment of the present invention.

FIG. 11 is an explanatory view of the action of sunlight in Example 3 of the present invention.

FIG. 12 is a diagram illustrating a light source light action according to the third embodiment of the present invention.

FIG. 13 is a diagram for explaining the action of sunlight in Example 4 of the present invention.

FIG. 14 is an explanatory diagram of a light source light action according to the fourth embodiment of the present invention.

FIG. 15 is an explanatory diagram showing a mounted state of the pseudo lighting prevention lens of the present invention.

[Explanation of symbols]

 1 Pseudo Lighting Prevention Lens 2 Lens Substrate 3 Curved Body 4 Valley 5 Concave 6 Light Penetration Hole 6'Light Insertion Hole

Claims (7)

(57) [Claims] 1. A transparent plate-like lens substrate is provided on both side surfaces thereof with curved bodies whose optical axes coincide with each other so as to project vertically and horizontally in a chain form so that their peripheral edges are in close contact with each other. A pseudo lighting prevention lens for a signal lamp, wherein the distance between the tops of both surfaces of the curved body is within 1.5 to 3 times the diameter of the curved body. 2. The valley portion of the boundary line where the peripheral portions of the curved bodies formed on the side surface of the light source of the transparent plate-shaped lens substrate intersect is formed in a concave groove shape. Pseudo lighting prevention lens for signal lights. 3. A light penetrating hole that directly emits a light beam on the light source side without refracting the light beam is provided between valleys of vertical and horizontal intersections of concave grooves on both side surfaces of the transparent plate lens substrate. The pseudo lighting prevention lens for signal lights according to claim 1. 4. The pseudo lighting prevention lens for a signal lamp according to claim 3, wherein the light through hole is formed in a constricted shape sequentially from the light source side toward the sun side. 5. An optical insertion hole is bored between the intersecting valleys from the light source side to the front side of the sun.
Pseudo-lighting prevention lens for signal light described. 6. The pseudo lighting prevention lens for a signal lamp according to claim 1, claim 2, claim 3, claim 4 or claim 5, wherein the curved surface member is a symmetric spherical member. 7. The pseudo lighting prevention lens for a signal light according to claim 1, claim 2, claim 3, claim 4, or claim 5, wherein the curved body has a symmetrical shape.