JPH0751680Y2 - Signal light - Google Patents

Description

TECHNICAL FIELD The present invention relates to a signal light used for a traffic signal or the like.

2. Description of the Related Art As a traffic signal light, as shown in FIG. 9, a colored front lens (2) having an inner surface formed into a multi-prism shape
, A light source body (4) and a reflecting mirror (3) having a substantially parabolic surface for reflecting the light emitted from the light source body (4). In this signal light, when external light (L) such as sunlight or headlights of an automobile enters the signal light through the front lens (2), it is reflected by the reflecting mirror (3) and again in front. As a result of being radiated to the outside through the lens (2), even if the light source body (4) is not lit, a pseudo representation (phantom) phenomenon that looks as if it is lit is caused, which is a traffic safety. It is causing a serious problem.

A louver system is known as a means for preventing this pseudo representation. This louvered signal light is
A large number of fins parallel to the optical axis of the front lens are arranged on the front surface of the front lens at predetermined intervals in a staggered pattern, and the louver blocks or reduces the extraneous light that enters obliquely in the vertical direction with respect to the optical axis. Light is emitted to prevent the entry of extraneous light into the signal lamp to prevent the false indication.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the case of the above-mentioned conventional louver type signal lamp, it is effective for the external light incident in the longitudinal direction oblique to the optical axis, but the external light parallel to the optical axis is effective. It is essentially impossible in principle to completely block the light, and it is not effective as a pseudo-display prevention means. Also,
This signal lamp could not perform a sufficient display function because the internal light emitted from the light source to the outside at the time of lighting is blocked by the louver.

Therefore, it is a first object of the present invention to provide a signal lamp capable of reliably preventing the pseudo-display phenomenon and achieving a sufficient display function by making the internal light a horizontal light without being diffused. To do.

A further object of the present invention is to provide a signal lamp with a pseudo-display prevention function, which is easy to manufacture and assemble and can be manufactured at low cost.

Means for Solving the Problems In order to achieve the first object, the present invention provides a front lens (2) between a front lens (2) and a light source body (4).
On the rear surface side of the convex lens part (12) composed of a plurality of long cylindrical lenses (12a, 12a) provided in parallel to each other so as to form a surface perpendicular to the optical axis of , A light-absorbing portion composed of a plurality of band-shaped light absorbers provided so as to be located near the focal point corresponding to each of the cylindrical lenses (12a, 12a), and an individual cylindrical shape on the front side of the convex lens portion (12) It is characterized by having a concave lens portion (14) corresponding to the lenses (12a, 12a) and comprising a plurality of concave lenses (14a, 14a) provided near the front focal point. The lens portion may be formed by integrally molding a substantially large number of cylindrical lenses, and a concave lens (14
It is also possible to integrate a) and the cylindrical lens (12a) and cut the front surface of the cylindrical lens (12a) into a concave surface (15).

Further, in order to achieve the second object, the present invention integrates a plurality of lenses constituting a lens unit, and integrally provides each lens and a light absorber corresponding thereto.

In the device for achieving the first object, the external light (L ₁ , L ₁ ) entering from the front of the signal lamp ( ₁ ) is largely refracted through the cylindrical lenses (12a, 12b), and the lens (1
Light absorber (13a) located near the focal point located immediately after 2a)
Is absorbed by. In addition, the internal light (L ₂ ,
Although a part of L ₂ ) is obstructed by the light absorber (13a), most of it is not disturbed by the light absorber (13a) and is emitted as a horizontal light by the concave lens part (12) to the outside. And improve the display function.

Further, in the device for achieving the second object, since the lens portion can be integrally molded and the light absorber is also integrated with the lens, it is only necessary to attach the lens portion, and therefore, it is possible to simplify the assembly of the signal lamp. To do.

Embodiment Hereinafter, the present invention will be described based on an embodiment shown in the drawings.

As shown in FIG. 1, a signal lamp (1) according to the present invention comprises a front lens (2), a light source body (4) and a reflecting mirror (3), the front lens (2) and the light source body (4). It has an optical filter (F) fixed between the two.

As shown in FIG. 1, FIG. 2 and FIG. 3, the optical filters (F) are arranged parallel to each other so as to form a plane perpendicular to the optical axis of the front lens (2), A convex lens portion (12) composed of a long cylindrical lens (12a, 12a) and individual cylindrical lenses (12) on the rear surface side of the convex lens portion (12).
a) a light absorbing portion (13) formed of a band-shaped light absorbing body (13a, 13a) provided in correspondence with the lens (12a) and extending in the same length as the lens (12a), and the front surface of the convex lens portion (12). On the side, a concave lens (1) is provided corresponding to each cylindrical lens (12a, 12a) and extends in parallel with and has the same length as the lens (12a).
4a, 14a) and a concave lens portion (14). Each lens (12a, 12a) is made of transparent synthetic resin, preferably polycarbonate.

Further, each of the light absorbers (13a, 13a) has a predetermined width in the direction perpendicular to the optical axis of the corresponding cylindrical lens (12a), that is, about 1/4 to 5 minutes of the diameter of the lens (12a). Of a black heat-resistant material, preferably anodized aluminum or the like, and is located near the focal point (in this case, a linear focal point) located immediately after the lens (12a). .

Further, each concave lens (14a, 14a) is the light absorber (13a)
Internal light (L) emitted from the light source body (4) and reflected by the reflecting mirror (3) is provided so as to have a width substantially the same as that of the cylindrical lens (12a) and located near the focal point located in front of the cylindrical lens (12a) ₂ ) refracted by the cylindrical lenses (12a, 12a) and diffused through the front focal point serves to change the light into horizontal light. This concave lens (14a, 14a) is a cylindrical lens (12a, 1a
It is made of the same material as 2a), that is, a transparent synthetic resin, preferably polycarbonate.

The cylindrical lenses (12a) described above may be provided in parallel without being separated from each other.

The convex lens portion (12) may be a lens in which the upper and lower parts of the cylindrical lenses (12a, 12a) are substantially connected and integrated. By integrally molding in this way, means for fixing the individual lenses (12a, 12a) is not required. Even in this case, the individual cylindrical lenses (12a,
The light absorbers (13a, 13a) are provided correspondingly near the rear focal point 12a), and the concave lenses (14a, 14a) are provided correspondingly near the front focal point.

Thus, as in the embodiment shown in FIG. 3, since the lens portion (12) is composed of a plurality of lenses (12a, 12a) functioning as a cylindrical lens having a large refractive index, the signal lamp (1) External light (L ₁ ) entering from directly in front of is refracted through the lens (12a) and is absorbed by each light absorber (13a), as shown representatively for one lens (12a). , It does not reach the reflector (3). In particular, as is clear from FIG. 4A, extraneous light (L ₁ ) entering from an oblique lateral direction is provided near the circular convex lens (20) and the focal point (dotted in this case) of the lens (20). An optical filter composed of a light absorber (21) is not absorbed by the light absorber (21), whereas it is composed of a cylindrical lens (12a) and a band-shaped light absorber (13a) as in the present invention shown in FIG. 4B. In the optical filter (F) consisting of, the light absorber (13a) is surely absorbed. As a result, in the signal lamp (1) having the optical filter (F) having the above-mentioned configuration, the pseudo-display phenomenon is surely prevented.

The internal light (L ₂ ) emitted from the light source body (4) and reflected by the reflecting mirror (3) is partially absorbed by the light absorber (13a) as shown in FIG. This portion is emitted forward as horizontal light by the concave lens (14a) on the front side through the lens (12a), and the luminous intensity of the signal lamp (1), that is, the display function is improved.

FIG. 5 shows another embodiment in which the cylindrical lens (12a) and the concave lens (14a) are integrally formed. That is, the front surface of the cylindrical lens (12a) is cut out to form a concave surface (1
By making it 5), the lens (12a) is made to have a concave lens function. By doing so, the manufacturing cost is reduced, and assembly or fixing is unnecessary.

As described above, the cylindrical lens (12a) has a focal point immediately after that, so that the light absorber (13a) is directly bonded to the rear surface of each cylindrical lens (12a) as shown in FIG. It is also possible to fix them by means such as. In addition, a heat-resistant light-absorbing material may be printed, applied, and simultaneously formed on the rear surface of each lens (12a) as a light-absorbing body (13a). By integrating the light absorber (13a) and the cylindrical lens (12a) in this way, it is difficult to align the light absorber (13a) and the cylindrical lens (12a), and the light absorber (13a). No specific fixing means for

The optical filter (F) shown in FIGS. 7 and 8 comprises a lens portion (16) integrally having a plurality of spherical lenses (16a) so as to form a plane perpendicular to the optical axis of the front lens (2). The light absorber (17) having a small area is integrally provided on the rear surface of each spherical lens (16a), that is, near the focal point by fixing, printing, coating, simultaneous molding or the like, and the concave lens (12a) or concave surface is provided. (15) is provided. Even in the signal lamp (1) having the optical filter (F) having such a configuration, the external light (L ₁ ) entering from the front is absorbed by the light absorber (17).
While the internal light (L ₂ ) is emitted to the outside without being attenuated by the light absorber (17), the pseudo-display phenomenon is surely prevented and the Function does not deteriorate. Moreover, since it is only necessary to integrally fix the lens portion (16), the individual lens (16
Specific fixing means for each a) and each light absorber (17) is unnecessary, and alignment between each lens (16a) and the light absorber (17) is also unnecessary.

As described above, according to the present invention, between the front lens and the light source body, a convex lens portion made of a long cylindrical lens having a high optical refractive index is provided, and a predetermined width is provided near the focal point of each lens. Since the band-shaped light absorber is provided, the external light entering from directly in front of the signal lamp is surely absorbed by the light absorber.

Further, since a concave lens is provided or a concave surface is formed on the front surface of each of the cylindrical lenses, most of the internal light emitted from the light source body is not disturbed by the light absorber,
Moreover, the light is emitted to the outside as horizontal light by a concave lens or the like. As a result, the signal light of the present invention has the effect of reliably preventing the pseudo-display phenomenon and improving the display function considerably.

According to another aspect of the present invention, a plurality of lenses forming the lens unit are integrated, and each of the lenses and a light absorber corresponding thereto are integrally provided. As a result, there is provided a signal lamp with a function of preventing the pseudo-display phenomenon that can be manufactured and assembled at low cost.

[Brief description of drawings]

FIG. 1 is a sectional view of a signal light according to the present invention, FIG. 2 is a perspective view showing a convex lens portion, a light absorbing portion and a concave lens portion which constitute an optical filter of the signal light, and FIG. FIG. 4A and FIG. 4B are sectional views showing the operation of the signal lamp according to the present invention. FIG. 5 is a sectional view showing another embodiment of the cylindrical lens. FIG. 7 is a view showing still another embodiment of the lens portion according to the present invention, FIG. 7 is a view showing yet another embodiment of the present invention, and FIG. 8 is a sectional view taken along line VII-VII of FIG. FIG. 9 is a cross-sectional view showing a conventional signal lamp. (2): front lens, (3): reflecting mirror, (4): light source, (12,16): convex lens part, (12a): cylindrical lens,
(13): light absorbing part, (13a): light absorber, (14): concave lens part, (14a): concave lens, (15): concave surface, (16a): spherical lens, (d): diameter, (t). : Maximum thickness.

Claims (4)

[Scope of utility model registration request] 1. A signal lamp comprising a front lens (2), a light source body (4), and a reflecting mirror (3) for reflecting light emitted from the light source body (4) forward, wherein the front lens (2) A plurality of long cylindrical lenses (12a, 12a) provided in parallel to each other between the light source body (4) and the light source body (4) to form a plane perpendicular to the optical axis of the front lens (2).
A convex lens portion (12) consisting of, and corresponding to each of the cylindrical lenses (12a, 12a) on the rear surface side of the convex lens portion (12), and a predetermined direction in the direction perpendicular to the optical axis of the lens (12a). And a light absorbing portion (13) composed of a plurality of band-shaped light absorbers (13a, 13a) provided so as to be located near the focal point, and the individual circles on the front side of the convex lens portion (12). A signal lamp, comprising: a concave lens portion (14) corresponding to a columnar lens (12a, 12a) and including a plurality of concave lenses (14a, 14a) provided near the front focal point. 2. The concave lens (14a) and the cylindrical lens (12a) are integrated, and the concave surface (15) is formed by notching the front surface of the cylindrical lens (12a). Signal light described in. 3. A light absorber (13) corresponding to the lens (12a).
The signal lamp according to claim 1, wherein a) and a are integrally provided. 4. A signal lamp comprising a front lens (2), a light source body (4), and a reflecting mirror (3) for reflecting light emitted from the light source body (4) forward, wherein the front lens (2) A lens section (1) in which a plurality of spherical lenses (16a) arranged so as to form a surface perpendicular to the optical axis of the front lens (2) are integrated between the light source body (4) and the light source body (4).
6), a light absorber (17) having a predetermined area is integrally provided on the rear surface of each spherical lens (16a) so as to be located near the focal point thereof, and each spherical lens (16a) has a front surface. A signal light having a concave lens portion (14).