JP3482030B2 - Traffic light - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a signal light used for a traffic light, a signal for a railroad, and the like, and more particularly to a pseudo lighting prevention means for improving the visibility from the front diagonally lower side.

[0002]

2. Description of the Related Art Conventionally, for example, a traffic signal light installed at a road intersection or a pedestrian crossing is covered with a transparent front lens having a filter function of different colors such as blue, orange, red, etc. The signal color is developed. However, since such a traffic light is used by supporting the lamp body above a pillar standing on the roadside, outside light such as sunlight and various vehicle headlights passes through the front lens of the lamp body. It is known that when it enters the inside, it is reflected by the parabolic reflector of the lamp body and is emitted outside the lamp body again, so that a pseudo lighting phenomenon occurs as if the traffic signal was lighting.

Therefore, as an improvement plan to prevent such a phenomenon, as shown in FIG. 11 , a light-shielding lens 100 is further disposed on the inner surface side of the front lens 108, thereby shielding the intruding external light. Recently, a means for preventing the above-mentioned pseudo lighting phenomenon has been proposed.

[0004]

However, the above-mentioned prevention means is, for example, as shown in FIGS. 11 (a) and 11 (b), a shield having a predetermined formation width w on the front surface (or rear surface) of the light blocking lens 100. Since 101 are arranged in a row at appropriate intervals, they block the external light L, but the lamp body 10
As a result of blocking most of the emitted light (internal light) from the inside by the light source 103 in 2, there is a problem that the irradiation light from the light source is not effectively used.

In the above structure, the external light from a position slightly higher than the horizontal (the central optical axis p) partially invades from the unshielded portion between the shields 101 and 101, so that the pseudo lighting state is still maintained. Was occurring.

[0006]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems, and a light-shielding lens disposed in front of a parabolic reflector causes the light from outside, particularly from the horizontal (position of the optical axis p). It completely blocks (shields) external light such as sunlight that enters from a position near the upper vertical line, and lowers its radiation efficiency for forward downward radiation caused by the light emitted from the light source (internal light). With the aim of proposing a new signal light that can be done without

The first aspect of the present invention is a reflecting mirror (2) and a light source (3).
In a signal lamp (1) provided with a diffuser plate (4), a light-shielding lens (5) and a front lens (8) on the front side of the, the light-shielding lens (5) has a convex portion (5b) of its convex lens portion (5a). Is formed on the front side and the convex lens portions (5a) are continuously formed in the vertical direction in a row arrangement state, and each convex lens portion (5a) has a focal point (f ₁ ) on the central optical axis (p) or in the vicinity thereof. positions the rear edge (6a), a convex front end (6b) Len
Downward so as to reach the valley of the convex portion (5b) of the groove (5a)
The external light shielding member (6) is provided in a tilted state.
The back surface side of the external light shielding member (6) also has internal light composed of a reflective surface.
It is characterized in that it is a reflecting portion .

A second aspect of the present invention is a reflecting mirror (2) and a light source (3).
In a signal lamp (1) provided with a diffusion plate (4) and a light-shielding lens (5) on the front side of the light-shielding lens (5), the light-shielding lens (5) has a convex portion (5b) of its convex lens portion (5a) on the front side. each convex portion with a convex lens portion (5a) formed continuously in the vertical direction in rows arrangement (5a), its focus on the center of the optical axis (p) (f ₁₎ or end post near the (6a)
Was positioned, before end of (6b) convex portions protruding portion (5a)
Inclined downward to reach the valley of (5b)
An external light shielding member (6) is provided, and the external light shielding member is provided.
It is characterized in that the back side of (6) is an internal light reflecting portion composed of a reflecting surface .

A third aspect of the present invention is a reflecting mirror (2) and a light source (3).
In a signal lamp (1) provided with a light-shielding lens (5) and a front lens (8) on the front side, the light-shielding lens (5) has its convex portion (5a) with its convex portion (5b) on the front side. each convex portion with a convex lens portion (5a) formed continuously in the vertical direction in rows arrangement (5a), focus on the center of the optical axis (p) (f ₁₎ or end post in the vicinity (6
a) to position the convex lens portion front end (6b) of (5a)
Inclined downward so as to reach the valley of the protrusion (5b)
The external light shielding member (6) is provided in this state, and the external light shielding part is also provided.
It is characterized in that the back surface side of the material (6) is used as an internal light reflecting portion composed of a reflecting surface .

[0010]

[0011]

In a fourth aspect of the present invention, the light shielding lens (5) is
The external light shielding member (6) is integrally molded between the upper and lower convex lens portions (5a) (5a).
Alternatively, it is the signal light according to 2 or 3 .

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the signal lamp of the present invention will be described below with reference to FIGS.

FIG. 1 is an overall sectional view of a signal lamp showing a first embodiment of the present invention. Reference numeral 1 is a signal lamp, which is composed of a reflecting mirror 2, a light source 3, a diffusion plate 4, a light-shielding lens 5, and a front lens 8. ing. As shown in FIGS. 1 and 2, the light-shielding lens 5 is made of, for example, transparent glass or synthetic resin, preferably transparent polycarbonate resin or acrylic resin. The convex portion 5a of the convex lens portion 5a has a convex portion 5b. It is placed on the front side. The projections 5b are continuously formed in the vertical direction, and each projection 5b is formed horizontally over the entire length of the light-shielding lens 5 in the horizontal direction. As a whole, a large number of parallel lines are arranged in a row. Has been formed. Further, the rear surface 5c which is a light receiving surface for internal light is formed in a flat shape.

[0015] Incidentally, one of the convex lens portion 5a, it is necessary to focus f ₁ of the center of the optical axis p is located, the distance S _1, the distance in the lens S ₂ in the air in FIG. 3, the air Refractive index η ₁ inside, refractive index η ₂ inside lens, surface 5a _{1 of} lens
From the focal point f ₁ to the focal point (focal length) S ₀ , η
It is designed so that the relationship of ₁ S ₁ + η ₂ S ₂ = S ₀ holds. When the distance from the optical axis p of the convex lens (part) to the starting point e of S ₁ is r and the angle of S ₂ with respect to S ₀ is θ, r = S ₂ sin θ, S ₂ = S ₀ − ( η ₁ / η
₂ ) S ₁ and S ₁ = S ₀ −S ₂ cos θ.

In FIG. 2, reference numeral 6 has a predetermined length m in which the rear end 6a is located at the focal point f ₁ on the optical axis p, and the front portion is inclined downward from the optical axis P by θ. In the external light shielding member, the front end 6b of the member 6 reaches the valley between the adjacent biconvex lens portions 5a and 5a.
In addition, the length in the horizontal direction, that is, the length in the direction orthogonal to the paper surface of FIG. 2, is formed to extend over the entire length of the light blocking lens 5 in the horizontal direction. Further, the member 6 is molded at the same time as an embedded shape when the light shielding lens 5 is molded. As a material of the member 6, for example, a strip-shaped aluminum plate, a stainless plate, or the like is used, and the surface 6c thereof is coated with black for absorbing external light that has entered.

[0017] back surface 6e side of the external light shielding member 6, internal light reflection portions 6d formed by applying white or mirror coating is formed,
Internal light is reflected by the portion 6d and emitted to the outside. Further, as the external light shielding member 6, an aluminum seal whose surface is treated with black may be adhered to the surface of a transparent resin plate so that the surface absorbs light and the back surface reflects light.

The length m of the external light shielding member 6 corresponds to the angle of external light entering from an angle above the horizontal (optical axis p) and the inclination angle θ of the shielding member 6 with respect to the optical axis p. Although it can be determined, the longer the length, the more the penetration angle can be shielded, but the amount of light emitted obliquely downward in the front decreases, so the length m is appropriately determined by balancing. To be Since the external light shielding member 6 may be one that shields the optical path of external light entering from an angle above the optical axis P, one end (rear end) of the external light shielding member 6 is as described above. The position is not limited to the position of f ₁ and may be set in the vicinity of the focal point f ₁ as long as it is a position where the optical path of the external light can be blocked.

In FIG. 1, reference numeral 2 is a reflecting mirror, which has a high parabolicity and reflectivity in which a substantially parabolic reflecting portion 2a is provided on the front surface as shown in FIG. 1, and the reflecting portion 2a is vapor-deposited with aluminum. It is mirror-finished by electropolishing of aluminum or aluminum, and is positioned near the focal point F of the reflecting mirror, and the light source 3 such as an incandescent lamp is supported by being fitted in the socket 7.

In FIG. 1, reference numeral 4 denotes a diffusing plate made of a translucent member such as glass or synthetic resin, which is arranged behind the light-shielding lens 5 with an appropriate gap g, and which is radiated from a light source or reflected from a reflecting mirror 2. Rear surface 5c which becomes the light receiving surface of the light shielding lens 5
On the other hand, it is for omnidirectional scattering, and a large number of small irregularities for increasing the degree of scattering are formed on the front surface or the back surface of the plate.

[0021] 8 is a front lens glass or made of a translucent material of the synthetic resin, red, orange, and is colored in a predetermined color blue or the like. When the diffuser plate 4 is colored, the front lens 8 does not need to be colored, and the front lens 8 omits the lens step for scattering the inner surface in order to increase the illuminance. Reference numeral 9 denotes a flange fitting, which is used to attach the front lens 8, the light-shielding lens 5, and the diffusion plate 4 to the opening end 10a at the front end of the container body 10.

FIG. 4 shows a second embodiment of the present invention.
The figure is a sectional view of only the light-shielding lens 5 of the first embodiment. In the second embodiment, a cylindrical lens body having a spherical cross section made of the same material as that of the first embodiment, such as transparent glass or synthetic resin, is used as the convex lens portion 5a, and the convex lens portion 5a is arranged in the horizontal direction (lateral direction).
In addition, a plurality of convex lens portions 5a made of these cylindrical bodies are vertically stacked and the external light shielding member 6 is provided in a protruding shape at the rear of each of them to form the light shielding lens 5.

In the same manner as in the first embodiment, the external light shielding member 6 in this embodiment has its surface subjected to external light absorption treatment by black coating, its back surface white, and internal light reflection treatment applied by mirror coating. ing. Further, the front end of the outer light-shielding member 6 is located between the upper and lower convex portions 5a, the rear end is located at the focal f ₁ of the convex lens portion 5a.

The other structure is similar to that of the first embodiment. According to this embodiment, there is an advantage that a lens can be constructed by cutting a commercially available existing resin-made columnar wire rod to an appropriate length and stacking it, and can be manufactured easily and at low cost.

FIG. 5 shows a third embodiment of the present invention.
The figure is a sectional view of only the light-shielding lens 5 of the first embodiment. In the third embodiment, a convex lens portion 5a having a convex lens shape in cross section and a laterally long convex lens body made of the same material as that of the first embodiment such as transparent glass or synthetic resin is used.
And arrange it horizontally (horizontally),
A large number of these convex lens portions 5a are laminated in the vertical direction, and the external light shielding member 6 is provided in a protruding shape at the rear portion of each convex lens portion 5a to form the light shielding lens 5.

In the same manner as in the first embodiment, the external light shielding member 6 in this embodiment has its surface subjected to external light absorption processing by black coating, its back surface white, and internal light reflection processing applied by mirror coating. ing. Further, the front end of the outer light-shielding member 6 is located between the upper and lower convex portions 5a, the rear end is located at the focal f ₁ of the convex lens portion 5a.

The other structure is similar to that of the first embodiment. Next, in FIG. 2 for explaining the operation of the signal lamp having the configuration of the first embodiment shown in FIG. 2 on behalf of the one convex lens portion 5a, slightly above the central optical axis P (convex lens 5a
L ₁ and L ₂ , which are located below the valley above
Since the parallel external light ray of L ₃ is focused on the focal point f ₂ , the external light ray shielding member 6 disposed in front of the focal point f ₂ is in front.
It is absorbed by hitting the surface 6c and is prevented from reaching the reflecting mirror 2. Further, this shielding member 6 has no shielding effect when looking up from the point X below the optical axis P in FIG. 2, so that the emitted light of the light source 3, that is, the internal light L ₄ , L ₅ , and L ₆ is nothing. The light is transmitted through the lens portion 5a and radiated to the outside of the lamp without being affected by the above. Therefore, even when external light enters from slightly above the horizontal (optical axis p), this lighting state can be clearly discriminated from diagonally below. In the above, L _{1 to} L ₆ are shown by the center line of the parallel rays.

Next, in the lens structure of FIG. 5 described above, FIG. 6 shows respective states when the invasion angle (optical path) of external light and the emission angle (optical path) of internal light are variously changed.
Will be explained.

When L _{11 to} L ₁₄ are used as optical paths for external light, these external light are absorbed by the external light shielding member 6 and are prevented from entering.
Further, if L _{15 to} L ₁₇ are used as the optical paths of the downward radiated light from the light source, the external light shielding member 6 does not influence the internal light, and 100% of the light (light amount) is reflected by the lens 5a (5). And is emitted obliquely downward. Also L ₁₈ , L
_{If 19} is used as an optical path of upward radiated light from the light source, these radiated light is once reflected by the internal light reflecting portion 6d of the reflecting surface formed on the back surface 6e of the shielding member 6, and then transmitted through the lens 5a (5). Radiated to the outside.

That is, as shown in FIG. 7, the range of 100% of the amount of light emitted from the lens is from the horizontal (optical axis p) to a point t ₃ slightly below the lower side t ₂ of the vertical line t, and the horizontal ( The external light L _{11 to} L _{14 in} the range from the optical axis p) to the vicinity of the upper side t ₁ of the vertical line t is the range absorbed by the light shielding member 6 as described above, and thus this range is the reverse direction of the light. Therefore, the light from the light source is not emitted and is 0%, and therefore remains dark. In the above description, the light source is considered to be scattered light, and the reflection of the reflection portion is not particularly lost.

Next, different embodiments of the signal lamp of the present invention will be described. FIG. 8 shows a fourth embodiment of the present invention. Compared with the first embodiment shown in FIG. 1, the front lens 8 is omitted, and the diffuser plate 4 is made of a transparent material to transmit light. The difference lies in the use of a colored material.

Next, FIG. 9 shows a fifth embodiment of the present invention. Compared with the first embodiment shown in FIG. 1, the diffuser plate 4 is omitted, and a lens step is formed on the inner surface of the front lens 8. The difference is that 8a is formed to enhance the scattering property.

[0033]

As shown in FIG. 10 , the traffic light which is actually used with the signal light installed has a hood 11 attached to the front upper part of the main body 10 of the lamp. It becomes even clearer.

[0035]

As described above, according to claims 1 to 3,
In the invention described above, the external light such as sunlight entering from the horizontal (center optical axis p) or an angle slightly higher than that is absorbed by the external light blocking member of the light blocking lens to block the optical path to the reflecting mirror. In addition to being able to completely prevent the pseudo lighting due to the reflection of the reflecting mirror, in order to efficiently radiate the emitted light (internal light) emitted from the light source to the front diagonally downward, The lighting state can be clearly confirmed from diagonally below, and the visibility can be further enhanced.

The signal lamp of the present invention can be easily implemented by adding a light-shielding lens to an existing one or replacing a conventional light-shielding lens of the present invention with the light-shielding lens of the present invention. Is high, and at the same time leads to cost reduction.

Further, since the radiated to the non-parallel light rays (internal light) is also transmitted through the back surface which light blocking lens is reflected by the reflective portion of the external light shielding member Akarigai front from the light source to the al, quantity correspondingly And the efficiency is improved, and the entire diagonally downward direction (entire area) is brightened to improve the visibility from below.

Further, according to the invention of claim 4 , since the external light shielding member is built in the lens portion, the external light shielding member is not deformed or dust is not attached, and the desired effect is obtained. Can be secured for a long period of time and the lens portion and the external light shielding member are integrated, which facilitates the attachment and replacement work.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention and is a vertical sectional view showing the structure of a signal lamp.

FIG. 2 is an enlarged cross-sectional view of a light blocking lens portion.

FIG. 3 is a schematic explanatory diagram for lens design.

FIG. 4 is a schematic view of a light blocking lens having a different configuration.

FIG. 5 is a schematic view of a light-shielding lens having a different configuration.

FIG. 6 is a schematic diagram for explaining the operation.

FIG. 7 is an explanatory view of the same operation.

FIG. 8 is a vertical sectional view of a signal lamp according to another embodiment of the present invention.

FIG. 9 is a vertical sectional view of a signal lamp according to still another embodiment of the present invention.

FIG. 10 is a view showing a state in which the signal lamp of the present invention is attached to a hooded signal device.

11A and 11B show a signal lamp of a conventional example, where FIG. 11A is a vertical sectional view and FIG. 11B is an enlarged view of a light shielding lens.

[Explanation of symbols]

1 signal lamp 2 reflecting mirror 3 light source 4 diffusing plate 5 light-shielding lens 5a convex lens portion 5b convex portion 5c rear surface 6 light shielding member 6a one end 6b one end 6c surface 6d reflecting portion 6e back surface 8 front lens p optical axis f ₁ focus on optical axis m Length of external light shielding member

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Claims (4)

(57) [Claims] 1. A signal lamp (1) comprising a diffusing plate (4), a light-shielding lens (5) and a front lens (8) in front of a reflecting mirror (2) and a light source (3). )But,
The convex lens portion (5a) is formed such that the convex portion (5b) of the convex lens portion (5a) is on the front side and the convex lens portion (5a) is continuously formed in the vertical direction in a row arrangement state, and each convex lens portion (5a) has a central optical axis ( p) focus on (f ₁₎ or to position the rear edge (6a) near the front end of (6b) lens unit (5
Incline downward so as to reach the valley of the convex part (5b) of a)
The external light shielding member (6) is provided in such a state that the external light is
The back side of the shielding member (6) is used as an internal light reflection portion composed of a reflection surface.
The signal light that is characterized. 2. A signal lamp (1) comprising a diffuser (4) and a light-shielding lens (5) in front of a reflecting mirror (2) and a light source (3), wherein the light-shielding lens (5) has a convex lens portion. (5
The convex lens part (5b) of (a) is turned to the front side.
Each convex portion (5a) with successive form a) vertically row arrangement, to position the rear end (6a) to a focus (f ₁₎ or in the vicinity of the center of the optical axis on the (p) ,
Convex portion front end (6b) protrusion of (5a) valley of (5b)
External light shielding part in a state that it is tilted downward to reach the
A material (6) is provided, and the back side of the external light shielding member (6)
The signal lamp is characterized in that the is an internal light reflecting portion having a reflecting surface . 3. A signal lamp (1) having a light-shielding lens (5) and a front lens (8) in front of a reflecting mirror (2) and a light source (3), wherein the light-shielding lens (5) has a convex lens portion. With the convex portion (5b) of (5a) facing the front side, the convex lens portions (5a) are continuously formed in the vertical direction in a row arrangement state, and each convex lens portion (5a) has an optical axis (p) at the center thereof. the focus of (f ₁₎ or end post near the (6a)
Was positioned, before end of (6b) convex portions protruding portion (5a)
Inclined downward to reach the valley of (5b)
An external light shielding member (6) is provided, and the external light shielding member is provided.
A signal lamp characterized in that the rear surface side of (6) is an internal light reflecting portion composed of a reflecting surface . 4. The light shielding lens (5) according to claim 1, wherein the external light shielding member (6) is integrally molded between the upper and lower convex lens portions (5a) (5a). Three
Signal lamp according to.