JP6279831B2 - Signal lamp - Google Patents

Description

  The present invention relates to a signal lamp that is disposed on the front side of a light source so as to face a viewing angle limiting plate that limits a viewing angle of light from the light source, and more particularly to a signal lamp that is installed at a road intersection or a railroad track.

  Conventionally, regarding signal lamps installed at road intersections, etc., in order to prevent driver and pedestrian signals from being misidentified at intersections with complicated shapes, the viewing angle in the left and right direction is restricted and parting departures are prevented. Therefore, the viewing angle in the vertical direction may be limited so that lighting cannot be seen from a place far away from the signal lamp. In this way, the means for limiting the viewing angle generally includes a plurality of light distribution control blades on a full-tube or half-tube hood surrounding the front cover on the front wall of the lamp housing. The one with a louver was known.

  However, the hood provided with the louver has a large number of parts and a large number of assembly steps, resulting in an increase in weight and cost. In addition, it has a structure that projects farther forward than the standard hood, so it is strongly affected by the wind and the amount of snow accumulation during snowfall increases, so special strength measures are required and there is a risk of increasing costs. It was. Further, since the louver is exposed to the outside of the lamp housing, there is a possibility that snow adheres to the gap between the louvers and dust or the like is likely to accumulate, making it difficult to see the signal light.

  Furthermore, recently, LED signal lamps using a LED unit in which a large number of LEDs are mounted on a substrate as a light source have become widespread. Such an LED signal lamp has a structure in which the LED unit is housed in the lamp housing and the front side is covered with a transparent front cover. However, since the internal structure of the LED unit and the like is not bulky, What thins the whole body and does not attach the said food | hood is called what is called a flat type (for example, design registration No. 1333651). In the case of such a flat type, the louver could not be provided.

  In view of the problem of the louver in the conventional signal lamp as described above, the applicant of the present invention is concerned with the light distribution limiting plate provided in front of each LED at each position facing each LED in the LED signal lamp. There has already been proposed a signal lamp in which holes through which light emitted from an LED passes forward and the inner wall surfaces of these holes are formed in a tapered shape that gradually decreases in diameter toward the front (Patent Document 1). reference).

  As another means for limiting the viewing angle, for example, two triangular prisms are alternately combined into a prismatic shape, a light-shielding black mask material is attached to the side surface, and a panel is formed so that the side surfaces of many prism columns are combined. A prism plate arranged in parallel is known (see Patent Document 2). In addition, there is known a composite resin sheet in which a transparent thermoplastic resin and an opaque thermoplastic resin are extruded at the same time, and transparent portions and opaque portions are alternately laminated in layers (see Patent Document 3).

JP 2009-181161 A JP-A-8-96293 JP-A-11-262947

  However, in the prior art described in Patent Document 1 described above, the work of providing the individual holes in the light distribution limiting plate in a tapered shape in accordance with the arrangement of a large number of LEDs on the substrate requires a great deal of time and labor. The cost was a factor. In addition, there is a problem that there is no versatility if the arrangement of LEDs is different on different substrates, and a light distribution limiting plate corresponding to each different substrate must be prepared.

  Moreover, in the prior art described in Patent Document 2 described above, the configuration of the prism plate is very complicated, and it takes a lot of time and labor to create the prism plate, which causes a high cost and causes the signal lamp to rise. There was a problem. Furthermore, in the prior art described in Patent Document 3, the boundary surface between the transparent portion and the opaque portion inside the resin sheet becomes a reflection surface as it is, and light is reflected by this reflection surface, and light leaks in an obliquely forward direction. There was a problem that the viewing angle of the signal lamp could not be sufficiently limited.

  The present invention has been made paying attention to the problems of the prior art as described above, and can be widely applied to various light sources without incurring high costs with a simple configuration. It is an object of the present invention to provide a signal lamp that can reliably limit the viewing angle of light from the light source.

The gist of the present invention for achieving the object described above resides in the inventions of the following items.
[1] In the signal lamp (10) in which the viewing angle limiting plate (30) for limiting the viewing angle of the light from the light source (23) is opposed to the front side of the light source (23),
The viewing angle limiting plate (30) is arranged in a thin plate shape through which light is transmitted in a state where the light blocking portions (32) having a narrow width and extending in the longitudinal direction are arranged in a plurality of rows, and each light blocking portion (32). ) Are formed integrally on both side surfaces facing each other, and at least a treatment for preventing light reflection to the front is performed. The light transmission portions between the respective light blocking portions (32) are formed by the light blocking portions (32). It formed also convexly has been uneven surface,
The signal lamp device (10) characterized in that the treatment for preventing light reflection to the front is made by mixing opaque fine particles on both side surfaces of the light blocking portion (32) during molding .

  [2] The viewing angle limiting plate (30) is formed by laminating an opaque resin forming the light blocking portions (32) at predetermined intervals inside a plate plate (31) formed from the transparent resin forming the thin plate. The signal lamp (10) according to [1], wherein the signal lamp is integrally formed.

  [3] The signal lamp (10) according to [1] or [2], wherein the viewing angle limiting plate (30) is provided inside a lamp housing (11).

  [4] The viewing angle limiting plate (30) is interposed between the substrate (24) of the LED (23) constituting the light source and the front cover (22) disposed in front of the substrate (24). The signal lamp (10) according to [3], characterized in that:

  [5] The viewing angle limiting plate (30) forms a unit integrally assembled with the substrate (24) in a state of being arranged in front of the substrate (24). Signal lamp (10).

  [6] The signal lamp device (10) according to [4], wherein the viewing angle limiting plate (30) is provided integrally with the front cover (22).

  [7] The viewing angle limiting plate (30) is configured to serve also as a front cover (22) disposed in front of the substrate (24) of the LED (23) constituting the light source [2]. ] Signal lamp device (10) as described in].

  [8] The light blocking portion (32) has a shape in which the thickness between the side surfaces gradually increases from one end surface on the light incident side to the other end surface on the light emitting side in the viewing angle limiting plate (30). The signal lamp (10) according to [1], [2], [3], [4], [5], [6] or [7], characterized in that.

Next, the operation based on the above solution will be described.
According to the signal lamp device (10) described in the above [1], the viewing angle of the light from the light source (23) can be changed by arranging the viewing angle limiting plate (30) to face the front side of the light source (23). Restrict. That is, the signal lamp (10) is made visible only within a certain angle range in the left-right direction or the up-down direction.

  Here, the viewing angle limiting plate (30) is formed by arranging light blocking portions (32) having a narrow width and extending in the longitudinal direction in a thin plate shape through which light is transmitted and arranged in a plurality of rows. According to such a configuration, the present invention can be applied not only to LEDs but also to various types of light sources (23), and the entire shape of the viewing angle limiting plate (30) is a thin plate, so that the lamp is not bulky. It can be easily housed inside the container housing (11).

At least both sides of the light blocking portions (32) of the viewing angle limiting plate (30) facing each other are subjected to a process for preventing light reflection to the front. Specifically, the treatment here is, for example, processing into a jagged cross section so that the surface does not become flat, adding fine irregularities, and mixing opaque fine particles on both side surfaces of the light blocking portion (32). Can be considered. By preventing light reflection to the front, light does not leak unnecessarily outside the viewing angle limit range, and the viewing angle of light from the light source (23) can be reliably limited.

  Further, as a specific configuration of the viewing angle limiting plate (30), it is not always necessary to fill the thin plate-like interior with a transparent material. For example, each light blocking portion (32) is enclosed in a frame surrounding the thin plate-like interior. However, as described in [2] above, it can also be integrally formed with a resin.

  That is, it is integrally formed so that the opaque resin forming the respective light blocking portions (32) is laminated at predetermined intervals inside the plate plate (31) formed from the transparent resin forming the thin plate. By using such a resin molded product, handling becomes easy and sufficient strength can be secured, and there is no possibility that foreign matter enters the gaps between the respective light blocking portions (32).

  As described in [3] above, if the viewing angle limiting plate (30) is provided inside the lamp housing (11), it is not exposed to the outside. Therefore, it is not affected by wind or snowfall, is not bulky outside the lamp housing (11), can be arranged compactly inside, and can meet the demand for space saving. it can.

  Further, as a specific arrangement of the viewing angle limiting plate (30), for example, as described in [4] above, in the lamp housing (11), the substrate (24) of the LED (23) that forms the light source, And a front cover (22) disposed in front of the substrate (24). Thus, the viewing angle limiting plate (30) is sandwiched between the substrate (24) and the front cover (22), and can be easily and reliably held in the lamp housing (11).

  As described in [5] above, the viewing angle limiting plate (30) may be configured as a unit assembled integrally with the substrate (24) in a state of being arranged in front of the substrate (24) of the LED (23). good. Thereby, the viewing angle limiting plate (30) can be handled as the same component as the substrate (24) of the LED (23), and various types of front covers (22) can be combined later.

  Alternatively, as described in [6] above, the viewing angle limiting plate (30) can be provided integrally with the front cover (22). Thereby, the viewing angle limiting plate (30) can be handled as the same component as the front cover (22), and can be later combined with the substrate (24) of various types of LEDs (23).

  Furthermore, as described in [7] above, the viewing angle limiting plate (30) may also be configured to serve as a front cover (22) disposed in front of the substrate (24) of the LED (23). That is, the viewing angle limiting plate (30) itself also serves as the front cover (22). Thereby, the number of parts can be reduced. Moreover, it can implement simply by replacing the conventional front cover in the existing signal lamp with the viewing angle limiting plate (30) of the present invention.

  Further, as described in [8] above, the light blocking portion (32) is disposed between the both side surfaces of the viewing angle limiting plate (30) from one end surface on the light incident side toward the other end surface on the light emitting side. It is good also as a shape where thickness increases gradually. As described above, according to the cross-sectional shape, the shape of the portion that transmits light between the respective light blocking portions (32) gradually narrows from the state opened on the light incident side toward the light emitting side, and further. It is possible to prevent extra reflected light from leaking forward.

  The signal lamp according to the present invention can be applied to various light sources in a general manner without incurring high costs due to a simple configuration, and reliably limits the viewing angle of light from the light sources. be able to.

It is sectional drawing which shows the signal lamp device which concerns on 1st Embodiment of this invention. It is a front view which shows the signal lamp device which concerns on 1st Embodiment of this invention. It is a perspective view which shows the state which opened the lamp case of the signal lamp device which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the viewing angle limiting plate with which the signal lamp device which concerns on 1st Embodiment of this invention is equipped. It is sectional drawing which shows the other form of the viewing angle restriction | limiting plate with which the signal lamp device which concerns on 1st Embodiment of this invention is equipped. It is sectional drawing which shows the signal lamp device which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the signal lamp device which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the state which opened the lamp case of the signal lamp device which concerns on 3rd Embodiment of this invention. It is a front view which shows the signal lamp device which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the signal lamp device which concerns on 3rd Embodiment of this invention.

Hereinafter, various embodiments representing the present invention will be described with reference to the drawings.
1 to 5 show a first embodiment of the present invention.
The signal lamp 10 according to the present embodiment is installed at an intersection of a road, a railroad track, or the like, and as shown in FIGS. 1 to 3, an LED unit 20 that forms a light source inside the lamp housing 11. Is built in and configured.

  As shown in FIGS. 2 and 3, the lamp housing 11 is a box-shaped case in which the interior of each LED unit 20 described below is partitioned, and a main body 12 that can incorporate related parts as necessary. A lid 13 is provided on the front side of the door so as to be openable and closable. The main body 12 and the lid body 13 are connected to each other at their upper edges via hinges 14, and a well-known fastener 15 that engages with the lower edge of the lid body 13 is provided at the lower edge of the main body 12. It has been.

  As shown in FIG. 1, when the LED unit 20 is applied to, for example, a three-color (three-position) traffic signal lamp, the lamp unit is used as an individual lamp for each of the blue, yellow, and red lighting colors. This unit is assembled on the lid 13 side of the housing 11 and lights up in response to an electric signal supplied from the outside. The LED unit 20 has a case 21 made of a bottomed cylindrical body that opens forward.

  The front opening of the case 21 is closed with a front cover 22. The front cover 22 is formed, for example, from transparent glass or synthetic resin into a convexly curved cross-sectional shape. In the present embodiment, the front cover 22 is formed so as to have a property of simply transmitting light, and a lens. It does not have a general function or a function to diffuse light. This is because the function of limiting the viewing angle of light in the viewing angle limiting plate 30 to be described later is not reduced downstream of the viewing angle limiting plate 30 in the light irradiation direction. The front cover 22 is suitably colorless and transparent, but may be colored according to the emission color of the LED 23 described below.

  As shown in FIG. 2, the lid 13 of the lamp housing 11 is provided with a circular opening 13 a that matches the front cover 22 of the three LED units 20 side by side. A mounting portion (not shown) for positioning and mounting the case 21 of the LED unit 20 is provided on the inner periphery of each opening 13a. A carry handle 21 a is provided on the outer wall surface of the bottom surface of the case 21.

  As shown in FIG. 1, a substrate 24 of an LED 23 serving as a light source is disposed inside the case 21, and a viewing angle limiting plate 30 that limits the viewing angle of light from the LED 23 is further provided on the front side of the substrate 24. Is arranged. The substrate 24 is screwed to a mounting portion such as a boss (not shown) at a position close to the front opening inside the case 21, and the center thereof is arranged to match the convex top of the front cover 22. Further, as will be described later, the viewing angle limiting plate 30 is provided inside the case 21, that is, inside the lamp housing 11, and between the substrate 24 of the LED 23 and the front cover 22 disposed in front of the substrate 24. Is intervened.

  The substrate 24 is a general printed wiring board, and a large number of LEDs 23 are mounted on the surface side within a circular range. The LED 23 is not limited to an LED lamp in which a light emitting element is embedded in a substantially bullet-shaped mold, but may be an LED chip including only a light emitting element mounted on a lead wire. For each LED unit 20, in the case of a three-color lamp, LEDs 23 that emit blue, yellow, and red light in order from the left in front view of FIG. 2 are used.

  Further, although not shown, a connector for connecting an electric wire, a signal line, or the like is provided at an appropriate place such as the back side of the substrate 24, and is connected to a power supply unit, a control device that performs lighting control, and the like. Furthermore, the light quantity of the LED 23 is set so that it can be arbitrarily adjusted by a dedicated switch.

  The viewing angle limiting plate 30 is formed by arranging thin light-shielding light blocking portions extending in the longitudinal direction in a thin plate shape through which light is transmitted and arranged in a plurality of rows. In the present embodiment, an opaque resin forming each light blocking portion 32 is laminated at a predetermined interval and integrally molded inside a plate plate 31 formed from a transparent resin forming a thin plate. Here, the opposite side surfaces 32a and 32a of each light blocking portion 32 are subjected to a process for preventing light reflection at least forward (in the direction toward the front outside of the front cover 22).

  The size of the plate plate 31 may be a size that can cover the substrate 24, and the shape may be a rectangle that can cover the substrate 24, or a circle that matches the range in which the LEDs 23 are mounted. Further, as shown in FIG. 4, the thickness of the plate plate 31 is set to 5 mm, for example, in the present embodiment. In such a plate plate 31, the light blocking portions 32 are arranged at right angles to the plane of the plate plate 31 and are arranged in parallel with each other at equal intervals.

  Each light blocking portion 32 extends from one end edge of the plate plate 31 to the other end edge, and not only the longitudinal edge thereof but also the short edge direction (thickness direction of the plate plate 31). , Respectively, are exposed on the outer surface of the plate plate 31. However, each edge of the light blocking portion 32 does not necessarily have to be exposed on the outer surface of the plate plate 31 and may be molded so as to be embedded. In addition, each light blocking portion 32 is set so as to be brightest when viewed from the front by being orthogonal to the outer surface of the plate plate 31, but is inclined at a predetermined angle according to the limited range and direction of the viewing angle. You may do it.

  As shown in FIG. 4, the opposite side surfaces 32 a and 32 a of each light blocking portion 32 are spaced apart at equal intervals in the plane direction of the plate plate 31. Here, the thickness of each light blocking part 32, that is, the size between both side surfaces 32a and 32a is set to 0.2 mm, for example, in the present embodiment, and the interval between them is, for example, 0 in the present embodiment. .7mm is set. These specific dimensions may be set as appropriate in accordance with the viewing angle limit range required for the signal lamp 10.

  The viewing angle of the light from the LED 23 can be limited to a desired angle range by the ratio between the thickness of the plate plate 31 and the value of the interval between the light blocking portions 32. In addition, it is preferable that the thickness of each light blocking portion 32 itself is set to be as small as possible from the viewpoint of not reducing the amount of light going forward from the LED 23 so that only the transmission of light in both directions can be blocked. Regarding the arrangement of the viewing angle limiting plate 30, if the light blocking portions 32 are arranged in a row, the viewing angle in the left-right direction is limited. If the light blocking portions 32 are arranged in a row, The viewing angle in the vertical direction, that is, the perspective is limited.

  The plate plate 31 may be anything as long as it is a colorless and transparent resin. Specifically, for example, an acrylic resin, a polycarbonate resin (PC), an ASA resin (ASA), or the like is suitable. The light blocking portion 32 may be anything as long as it is a colored and opaque resin. Specifically, for example, the above-described acrylic resin or the like may contain carbon black or titanium oxide as a black colorant. What is important here is the surface processing on the both side surfaces 32a, 32a of the light blocking portion 32, and at least a process for preventing light reflection in the forward direction (the direction toward the front outside of the front cover 22) is performed.

  As the treatment for preventing the light reflection, specifically, for example, fine concavo-convex for reducing the reflection of light at the boundary surface with the transparent resin that is the plate plate 31 is formed on both side surfaces 32a and 32a. It may be formed by embossing or flocking, a plurality of stripes having a saw cross section may be formed on both side surfaces 32a, 32a, or fine rib-shaped protrusions may be integrally formed in advance. The point is that the light reflected by the boundary surface between the plate plate 31 and both side surfaces 32a, 32a of the light blocking portion 32 is directed in the direction toward the front outer side of the front cover 22, particularly between the light blocking portions 32. Any structure can be used as long as it can suppress the reflection of light that spreads at a wider angle than the end face of 31.

  When the viewing angle limiting plate 30 is integrally formed by the method described below, it is formed so that opaque fine particles are mixed into both side surfaces 32a and 32a of the light blocking portion 32 that contacts the plate plate 31 at the time of forming. Thus, it is possible to easily perform a process for preventing light reflection. Here, the specific forming method of the viewing angle limiting plate 30 is a method of simultaneously extruding the plate plate 31 and the light blocking portion 32, and the transparent resin of the plate plate 31 extruded from the first extruder, The opaque resin of the light blocking portion 32 extruded from the second extruder is merged in a mold, and the merged material extruded from the mold is passed through a sizing die to obtain the viewing angle limiting plate 30.

  According to such a manufacturing method, the grooves and protrusions for attachment to the inside of the case 21 can be easily formed integrally, the design dimensions can be stabilized, and the light can be diffused and refracted. As described above, the surface can be uneven, and the above-described treatment for preventing light reflection can be easily performed. Here, the design dimensions of the viewing angle limiting plate 30 include not only the thickness but also the thickness of the plate plate 31 and the distance between the light blocking portions 32 as described above, for example, as shown in FIGS. It can be easily changed as shown.

  Further, as the irregularities on the surface of the viewing angle limiting plate 30, for example, as shown in FIGS. 5C and 5D, the end surface of the transparent resin portion between the light blocking portions 32 has a convex cross section from the plate surface. It may be projected in a shape. Such irregularities on the surface of the viewing angle limiting plate 30 can be easily formed into an arbitrary shape in consideration of light diffusion and refraction. The cross-sectional shape extending in the longitudinal direction of each light blocking portion 32 is not limited to a strip shape extending in a straight line, and may be curved or bent.

  Furthermore, as another example of each light blocking portion 32 in the viewing angle limiting plate 30, as shown in FIGS. 5 (e) and 5 (f), in the viewing angle limiting plate 30, from the one end surface 32b on the light incident side to the light emitting side. It is good also as a shape where the thickness between the said both side surfaces 32a and 32a increases gradually toward the other end surface 32c. As described above, according to the cross-sectional shape, the shape of the portion that transmits light between the respective light blocking portions 32 gradually narrows from the state opened on the light incident side toward the light emitting side, so that it is even more unnecessary. It is possible to prevent the reflected light from leaking forward.

  As described above, the viewing angle limiting plate 30 includes the LED 24 and the front cover 22 disposed in front of the substrate 24 in the LED unit 20 housed in the lamp housing 11. Intervened in between. Here, the viewing angle limiting plate 30 may be configured as a unit assembled integrally with the substrate 24 in a state of being arranged in front of the substrate 24. Alternatively, the viewing angle limiting plate 30 may be provided integrally with the front cover 22.

  When assembling the viewing angle limiting plate 30 integrally with the substrate 24, for example, bosses 24a as shown in FIG. 1 are projected at the four corners on the surface side of the substrate 24, and the viewing angle limiting plate 30 is screwed to the bosses 24a. Alternatively, the viewing angle limiting plate 30 may be integrally attached to the front of the substrate 24 via a spacer. Further, when the viewing angle limiting plate 30 is provided integrally with the front cover 22, for example, if the front cover 22 has a planar shape, the viewing angle limiting plate 30 is preferably superimposed and integrated with the inner surface instead of the outer surface. .

Next, the operation of the signal lamp device 10 according to the first embodiment will be described.
As shown in FIG. 1, according to the signal lamp 10, the LED 23 emits light from the LED 23 by disposing the viewing angle limiting plate 30 so as to face the front side of the substrate 24 of the LED 23 that is a light source. The viewing angle of the light can be limited. As shown in FIG. 4, the viewing angle limiting plate 30 is integrally formed by laminating opaque resins forming a plurality of light blocking portions 32 at predetermined intervals inside a plate plate 31 formed from a transparent resin into a thin plate shape. It becomes.

  In such a viewing angle limiting plate 30, the light emitted from the LED 23 arranged behind the passage is allowed to pass only within a predetermined angle range from the gap between the light blocking portions 32 to the front. The viewing angle in the direction is limited within a predetermined angle range. Here, the arrangement of the light blocking portions 32 on the viewing angle limiting plate 30 and the arrangement of the LEDs 23 on the substrate 24 do not necessarily match, and the viewing angle is limited not only for the LEDs 23 but also for various types of light sources. The plate 30 can be applied universally.

  At least both sides of the light blocking portions 32 of the viewing angle limiting plate 30 that face each other are subjected to a process for preventing light reflection forward. As described above, when the viewing angle limiting plate 30 is integrally formed of resin as described above, opaque fine particles are mixed into both side surfaces 32a and 32a of the light blocking portion 32 that contacts the plate plate 31 during the molding. What is necessary is just to shape | mold. In any method, by preventing light reflection forward on both side surfaces 32a of each light blocking portion 32, light does not leak unnecessarily outside the viewing angle limit range, and the viewing angle of light from the LED 23 is increased. It can be surely limited.

  In addition, since the viewing angle limiting plate 30 is a resin molded product, handling becomes easy and sufficient strength can be secured, and there is no possibility that foreign matter enters the gaps between the light blocking portions 32. In addition, the viewing angle limiting plate 30 has a thin plate shape as a whole and can be easily accommodated in the lamp housing 11 without being bulky. In particular, since the viewing angle limiting plate 30 is not exposed to the outside by being provided inside the lamp housing 11, it can be arranged in a compact manner without being affected by wind and snowfall, and there is a demand for space saving. Can also respond.

  As a specific arrangement of the viewing angle limiting plate 30, the viewing angle restriction plate 30 is arranged inside the LED unit 20 housed in the lamp housing 11. That is, as shown in FIG. 1, the viewing angle limiting plate 30 is interposed between the substrate 24 of the LED 23 and the front cover 22 inside the LED unit 20. Accordingly, the viewing angle limiting plate 30 is sandwiched between the substrate 24 and the front cover 22 and can be easily and reliably held in the LED unit 20.

  In particular, when the viewing angle limiting plate 30 is configured as a unit integrally assembled with the substrate 24 in a state of being arranged in front of the substrate 24, the viewing angle limiting plate 30 can be handled as the same component as the substrate 24 of the LED 23. Various types of front cover 22 can be combined later. Alternatively, the viewing angle limiting plate 30 can be provided integrally with the front cover 22 instead of the substrate 24. Thereby, the viewing angle limiting plate 30 can be handled as the same component as the front cover 22 and can be combined with the substrate 24 of various types of LEDs 23 later.

FIG. 6 shows a second embodiment of the present invention.
The signal lamp 10A according to the present embodiment is omitted from illustration because the basic structure of the signal lamp 10, the lamp housing 11 and the LED unit 20 according to the first embodiment is the same, but is not illustrated. The shape of the front cover 22A is different. Further, the front cover 22 </ b> A also serves as the viewing angle limiting plate 30. In addition, the same code | symbol is attached | subjected to the site | part of the same kind as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  In the present embodiment, the front cover 22A is not curved and is formed as a flat disk, and the front cover 22A is composed of the viewing angle limiting plate 30 that is the resin molded product described above. That is, the viewing angle limiting plate 30 itself also serves as the front cover 22A. Thereby, the number of parts can be reduced. Moreover, it can implement simply by replacing the conventional front cover in the existing signal lamp with the front cover 22A that also serves as the viewing angle limiting plate 30 of the present invention.

7 to 9 show a third embodiment of the present invention.
The signal lamp 10B according to the present embodiment is different from the signal lamps 10 and 10A according to the first and second embodiments described above in the structure of the lamp housing 11B and the LED unit 20B. That is, the lamp housing 11B includes a case-like main body 12B and a lid 13B that can be opened and closed on the front surface side of the main body 12B. The main body 12B has a thickness of an LED unit 20B described later. It is formed in a shallow case shape in the combined depth direction.

  Inside such a main body 12B, the LED unit 20B is arranged so that light can be emitted forward even when the lid 13B is opened. That is, the LED unit 20B is arranged in a state where the front surface thereof faces the inner side of the front surface of the lid body 13B in parallel. Here, the lid body 13B is formed in a substantially flat plate shape that closes the front opening of the main body 12B, and the front cover 16 that is also formed in a flat plate shape on the front side thereof is incorporated into a continuous flat surface. In addition, about the same parts, such as the hinge 14 and the fastener 15, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  The LED unit 20B has a case 21B made of a shallow cylindrical body that opens toward the front, and the substrate 24 of the LED 23 is disposed so as to cover the front opening of the case 21B. Such an LED unit 20B is disposed not inside the lid 13B as in the first and second embodiments, but inside the main body 12B as described above.

  In the present embodiment, the viewing angle limiting plate 30 is provided integrally with the front cover 16 on the lid 13B side, not on the LED unit 20B side. That is, it is preferable to arrange the viewing angle limiting plate 30 that is also formed in a disc shape so as to overlap the back side (inside) of the lid 13B. Or you may comprise the front cover 16 itself from the said viewing angle restriction | limiting plate 30 similarly to 2nd Embodiment mentioned above.

  That is, the front cover 16 may be configured to serve as the viewing angle limiting plate 30. Thereby, the number of parts can be reduced. Further, the conventional front cover in the existing signal lamp can be simply implemented by replacing it with the front cover 16 constituted by the viewing angle limiting plate 30.

  Further, according to the signal lamp 10B according to the present embodiment, since the LED unit 20B is disposed inside the main body 12B instead of the lid 13B, the lid 13B that is opened and closed during maintenance is related to the LED unit 20. A heavy object is not added, the weight on the side of the lid 13B can be significantly reduced, and the lid 13 can be easily opened and closed.

  Moreover, even when the lid 13B is opened, the light from the LED 23 inside the main body 12B can be irradiated as it is without passing through the front cover 16 of the lid 13B. Thereby, even when the lid 13B is opened, the driver and the pedestrian can easily see the light from the LED 23 from the original viewing direction, and even if the maintenance is prolonged, the traffic situation is great. There is no effect.

  As described above, the embodiments of the present invention have been described with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the present invention can be modified or added without departing from the scope of the present invention. Included in the invention. For example, in each of the above-described embodiments, an example in which the LED unit 20 is used for a three-color lamp (three-position type) has been described. However, the present invention is not limited to this example. The present invention can also be applied to other signal lamps such as lamps and single flashing lamps. Alternatively, a type in which an arrow lamp or a single flashing lamp is added to a three-color lamp (three-position type) may be used.

  Further, the thickness of the plate plate 31 in the viewing angle limiting plate 30 and the direction and size of the vertical or horizontal rows of the respective light blocking portions 32 may be appropriately set according to the viewing angle limit range required for the actual signal lamp. good. Further, the viewing angle limiting plate 30 is not limited to a resin molded product, and for example, as another configuration, the viewing angle limiting plate 30 is configured by arranging the light blocking portions in a rectangular frame surrounding the thin plate-like interior. May be.

  INDUSTRIAL APPLICABILITY The present invention can be widely used for various signal lamps for allowing a vehicle or a passerby to see traffic permission or stop instructions and other traffic regulation information.

DESCRIPTION OF SYMBOLS 10 ... Signal lamp 10A ... Signal lamp 10B ... Signal lamp 11 ... Lamp housing 12 ... Main body 13 ... Lid 13a ... Opening 13B ... Lid 14 ... Hinge 15 ... Fastener 16 ... Front cover 20 ... LED unit 21 ... Case 22 ... Front cover 22A ... Front cover 23 ... LED
24 ... Substrate 30 ... Viewing angle limiting plate 31 ... Plate plate 32 ... Light blocking part

Claims (8)

In a signal lamp that is disposed so as to oppose a viewing angle limiting plate that limits the viewing angle of light from the light source on the front side of the light source,
The viewing angle limiting plate is disposed in a thin plate shape through which light is transmitted, in a state where light blocking portions having a narrow width and extending in the longitudinal direction are arranged in a plurality of rows, and at least on both side surfaces of each light blocking portion facing each other. are those processes to prevent light reflection forward are integrally molded has been subjected to forming an irregular surface to which light transmitting portions are convex set than the light blocking part between the light blocking portion,
The signal lamp device characterized in that the treatment for preventing the light reflection to the front is made by mixing opaque fine particles on both side surfaces of the light blocking portion during molding .   The viewing angle limiting plate is integrally formed by laminating an opaque resin forming each light blocking portion at a predetermined interval inside a plate plate formed from a transparent resin forming the thin plate. Signal lamp according to 1.   The signal lamp according to claim 1, wherein the viewing angle limiting plate is provided inside a lamp housing.   The signal lamp according to claim 3, wherein the viewing angle limiting plate is interposed between an LED substrate that forms the light source and a front cover disposed in front of the substrate.   5. The signal lamp device according to claim 4, wherein the viewing angle limiting plate forms a unit assembled integrally with the substrate in a state of being arranged in front of the substrate.   The signal lamp according to claim 4, wherein the viewing angle limiting plate is provided integrally with the front cover.   The signal lamp device according to claim 2, wherein the viewing angle limiting plate is configured to serve also as a front cover disposed in front of a substrate of the LED that forms the light source.   The light blocking portion has a shape in which the thickness between the side surfaces gradually increases from one end surface on the light incident side to the other end surface on the light emitting side in the viewing angle limiting plate. Signal lamp according to 2, 3, 4, 5, 6 or 7.

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