JPH0962988A - Traffic signal light - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent false lighting means of external light and also to visually recognize a signal even at a place near a signal light by arranging a light shielding body with a light-transmission window while limiting it at a specified position (range). SOLUTION: A front surface lens has a prism part 4c which refracts external light downward. The upper surface sides of respective light shielding plates 8 constituting the light shielding body 7 are formed on light shielding surfaces 8a by executing black coating for absorbing light and lower surface sides are formed in optical reflection surfaces 8b by executing white coating or mirror like finishing for reflecting light. The light shielding body 7 is arranged in front of a line which connects one end 3b or 3a of the filament 3 of an electric bulb to an end 1a or 1b at the other side 3a or 3b of a reflection mirror 1 and is arranged behind the line which connects the one end 3b or 3a of the filament 3 to the optionally set point 4e or 4d of the front surface lens 4, the light-transmission window 10 is formed at the center part of the light shielding body 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traffic signal lamp having a pseudo lighting prevention function (light shield) capable of eliminating or mitigating a pseudo lighting phenomenon caused by external light.

[0002]

2. Description of the Related Art A traffic signal light used in a traffic signal or the like is generally equipped with a light bulb as a light source, a parabolic reflector formed so that the filament of the light bulb is at a focal position, and a front surface of the reflector. It consists of a colored front lens.

It is known that the traffic signal lamps which are generally used nowadays have a pseudo lighting phenomenon as if a light bulb, which is a light source, were lit up when external light such as sunlight directly hits the front lens. As a kind of pseudo lighting prevention means of this kind, a dark filter is covered on the front lens, a hood is provided on the signal lamp so as to block the incidence of external light such as sunlight, and a horizontal flat plate is arranged side by side to form a light shield. However, it has been proposed to arrange this between the front lens and the light source.

[0004]

By the way, among the above-mentioned conventional structures, the light-shielding type using the light-shielding body can effectively shield external light that is almost horizontal and prevent pseudo lighting. However, on the other hand, the light emitted from the light source (bulb) has a small emission angle, that is, only the light that is almost horizontal is emitted to the outside of the lamp, and therefore the lighting state of the signal lamp can be visually recognized only near the optical axis. , It is difficult to see from diagonally below.
Therefore, although the signal can be visually recognized from a place distant from the signal light, there is a problem that the signal is hard to be visually recognized in a place near the signal light.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a traffic signal lamp which can prevent false lighting due to external light and can visually recognize a signal even in a place near the signal lamp.

[0006]

DISCLOSURE OF THE INVENTION The present invention is to solve the above-mentioned problems, and includes a reflecting mirror (1) having a parabolic surface,
Light bulb (2) as light source and colored front lens (4)
In the traffic signal light including the light shield (7), the front lens (4) has a prism portion (4) that refracts external light downward.
c), the reflecting mirror (1) is located behind the light bulb (2), and the light shield (7) has a black light-shielding surface (8a).
The reflective surface (8
b), a plurality of horizontal light-shielding plates (8) are vertically arranged side by side. Further, the light-shielding body (7) is formed from the center (3c) of the filament (3) of the light-emitting part of the light bulb (2). One end (3b or 3a) and the effective paraboloid (1) of the reflecting mirror (1).
d) is located in front of a line connecting the center (3c) of the light emitting part (3) and the end (1a or 1b) on the other side (3a or 3b) side, and also the light emitting part of the light bulb (2). From the center (3c) of the filament (3) to one end (3b or 3)
It is arranged behind a line connecting a) and a point (4e or 4d) in the same direction arbitrarily defined within the effective radius of the front lens (4), and also the central portion of the light shield (7). Is provided with a hole (8c) larger than the diameter of the light bulb (2).

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 1 is a reflecting mirror having a parabolic surface, 2 is a light bulb, and a filament 3 as a light emitting portion thereof is arranged so as to match a focal point P of the reflecting mirror 1.

Reference numeral 4 denotes a colored front lens arranged on the front surface of the reflecting mirror 1. The outer surface 4a side is formed to be smooth, and the inner surface 4b side diffuses external light from the outside in the horizontal direction and slightly downward. A prism portion 4c having a refracting shape is formed.

Reference numeral 5 is a packing for mounting the front lens, and 6 is a socket for supporting the electric bulb. Reference numeral 7 denotes a light shield, which is composed of a plurality of horizontally arranged light shield plates 8 arranged in parallel in the vertical direction at a predetermined interval and connected by a support body 9. The support 9 is made of an aluminum plate, a press board, a synthetic resin plate, wood, or the like.

The light shielding plate 8 has an upper surface side coated with a black coating for light absorption to form a light shielding surface 8a, and a lower surface side thereof has a white coating for light reflection or a mirror-finished surface for a light reflecting surface 8b.
Is formed.

The support body 9 is vertically arranged on both sides of the light bulb 2, and a plurality of horizontal support grooves (not shown) are formed in front of the support body 9 in accordance with the arrangement intervals of the light shielding plates 8. The light-shielding plates 8 are connected to the light-shielding plates 8 at predetermined intervals by inserting the rear ends of the respective light-shielding plates 8. Then, the outer peripheral portion of the light-shielding body 7 configured as described above is fixed to the inner surface of the reflecting mirror 1 by an adhesive or the like and fixed.

Next, the range in which the above-mentioned light shield 7 is installed will be described. In FIG. 1, the light emitting part (filament) of the light bulb is 3, and the lower end of the light emitting part (filament) is 3
a, the upper end of the light emitting portion (filament) 3b, the front lens 4, the reflecting mirror 1, the effective lower end of the reflecting mirror 1a, the effective upper end of the reflecting mirror 1b, an arbitrary radius from the optical axis A is r ₁ , When r ₁ point on the front lens 4 is 4d, an arbitrary radius from the optical axis A is r ₂ , and r ₂ point on the front lens 4 is 4e, 3
line a connecting b-1a, line b connecting 3a-1b, and 3a
-4d, a line (3b-4e), a line (e) along the front hemisphere of the light bulb 2, an ineffective portion of the reflecting mirror 1, and an inner surface of the front lens 4 in close proximity. It is arranged within the range surrounded by the line.

In other words, the light shield 7 is one end 3b from the center 3c of the light emitting portion (filament 3) of the light bulb 2 which is the light source.
(Or 3a) and the end 1a located on the other side (3a) from the center 3c of the light emitting portion 3 from the center of the effective paraboloid 1d of the reflecting mirror 1.
(Or 1b) is located in front of the line connecting to
From the center 3c of the light emitting part (filament 3) of the other end 3
a (or 3b) and radius r ₁ (point 4d on front lens 4) in the same direction arbitrarily determined from optical axis A within the effective radius of front lens 4 (or radius r ₂ (point 4e on front lens 4e )) Is located behind the line connecting.

The arbitrary radii r ₁ and r ₂ are the radii on the front lens 4 which are determined from the angle at which the light bulb 2 can be directly seen from below or above, that is, the emission angle θ ₀ . Although not particularly shown, an arbitrary radius is determined not only in the vertical direction but also in the horizontal direction to determine the radiation angle. FIG. 2 shows a view of the signal light when viewed from the front.

The radii r ₁ and r ₂ shown in FIG. 1 are as follows on the vertical line passing through the center of the light bulb 2 as shown in FIG.
The distance from the optical axis A to the points 4d and 4e is shown. The front end shape of the light passing window 10 without the light shield 7 is an underline passing through the point 4d with a diameter larger than the radius r ₁ as shown in FIG. And an upper line L having a diameter larger than the radius r ₂ and passing through the point 4e.

The light-shielding plate 8 of the light-shielding member 7 constructed as described above has a half-barrel shape in plan view. Further, the depth width L of each light-shielding plate 8 arranged horizontally within the range surrounded by each of the above lines I to E becomes shorter and longer. That is, FIG.
As shown in FIG. 5, the depth width L is long at each substantially central portion in the upper half portion and the lower half portion of the light shield 7, and the depth width L is at the upper and lower portions thereof.
Becomes shorter.

Therefore, the interval d between the light shielding plates 8 is wide in the portion having the long depth width, and the light shielding plate 8 is in the portion having the short depth width.
The interval d between them is narrowed. This is for the following reasons.

As shown in FIG. 3, the depth width of the shading plate 8 is L, the incident angle of the external light with respect to the optical axis A (actually, the refractive index of the front lens is also taken into consideration) is θ ₁ , and the shading plates are separated from each other. When the interval is d, a relational expression of d = Ltan θ ₁ is established between them.

Therefore, if L is smaller than the above, d also becomes smaller. This means that if the depth width L of the light shielding plate 8 becomes smaller, it is necessary to make the interval d smaller to achieve proper light shielding. Therefore, the distance d is set according to the depth width L of the light shielding plate 8 as described above.

Further, the distance d between the respective parts is set to d ≦ Ltan θ ₁ and set so that proper light shielding can be performed. Further, the light-shielding plate 8 is made as thin as possible because its thickness hinders the emission of reflected light to the outside.
It is necessary to reduce the number of light shields 8 used as much as possible. Therefore, as in the embodiment of FIG. 1, the gap d can be increased by increasing the depth width L of the light shielding plate 8, and thus the number of used light shielding plates 8 can be reduced.

Of course, the thickness of the support 9 and
Use as few sheets as possible. Next, the signal of the above configuration
The operation of the lamp will be described. 1 and 3, the opposite
Extraneous light C from a horizontal angle parallel to the central optical axis A of the mirror₁
Is refracted downward by the prism portion 4c of the front lens 4.
And is absorbed by the inner part of the light shielding surface 8a on the upper surface side of the light shielding plate 8.
It is shielded from light. And higher angle θ ₂Out of
Arrival C₂Is also due to the prism portion 4c of the front lens 4.
It is refracted downward and is absorbed by the front part of the light shield 8 to block light.
Is done.

In FIG. 1, the main power radiated light B ₂ radiated from the focal point P of the reflecting mirror, that is, the center 3c of the filament 3 of the light bulb ₂ is reflected by the radiating mirror 1 formed of a paraboloid and within the interval d. After passing through the front lens 4, it is bent downward by the front lens 4 and radiated so as to go slightly downward, and is emitted to the outside without any trouble.

Further, the emitted light B ₁ emitted from one end 3a of the filament 3 is reflected on the reflecting mirror and the distance d
After entering the inside and being reflected by the reflecting surface 8b on the lower surface side of the light shield 8, the light is radiated to the outside through the front lens 4 and obliquely downward.

Further, the direct light D radiated forward from the light bulb 2 passes through the light-transmitting window 10 formed in the light shield 7, is refracted downward through the front lens 4 without any trouble, and is radiated to the outside. It

From the above, the external light C ₁ and C ₂ from a position higher than the optical axis A of the reflecting mirror is shielded by the light shielding surface 8a on the upper surface of the light shielding plate 8. On the other hand, the reflected light B ₁ emitted from the light bulb 2 which is the light source and reflected from the reflecting mirror,
B ₂ and the direct light D of the light bulb 2 are smoothly radiated to the outside without being hindered by the light shield 7.

Next, FIG. 4 is a signal lamp showing a different embodiment of the present invention. In the present embodiment, the peripheral surface (front end of the light shielding plate 8) of the light shielding body 7 which constitutes the light transmitting window 10 is the light bulb 2.
A line connecting _one end 3a of the filament 3 of the above and the point 4d ′ of the front lens 4 having the radius r ₁ in the above-mentioned embodiment,
It is formed so as to be located on the conical surface that is rotated about the optical axis A. Therefore, the point 4e ′ in the figure is also the optical axis A
At a radius r ₁ from. Therefore, this light passing window 10
When the section is viewed from the front of a signal or the like, it becomes a perfect circle as shown by line E as shown in FIG.

Further, the rear ends a and b of the light shield 7 are formed with the same inclination as that of the embodiment shown in FIG. 1, and the front end wa and the power are formed parallel to the rear ends a and b. Therefore,
A plurality of horizontally arranged light-shielding plates 8 constituting the light-shielding body 7.
Is formed into an arc-shaped flat plate or a bow-shaped flat plate having the same width (depth) over the entire length in the left-right direction when viewed from above.

Further, since each of the light shielding plates 8 of the light shielding body 7 other than the conical surface portion forming the light passing window 10 has the same depth L, the distance d between the portions is equal to the above d. They are formed to have the same dimensions within a range that satisfies the expression ≧ Ltan θ ₁ . Since this depth L can be made relatively long, each interval d can also be made relatively large. Further, the distance d between the light shielding plates 8 in the light-transmitting window 10 is also formed to have the same size as above.

Therefore, as compared with the above-mentioned embodiment, there is a problem that the light shielding characteristics are slightly deteriorated in the gaps between the light shielding plates 8 in the light transmitting window 10, but the distance d between all the light shielding plates 8 is large.
It is possible to reduce the number of light-shielding plates 8 to be used by making it relatively rough and simplify the light-shielding body 7 to considerably reduce the cost.

[0030]

As described above, in the signal light of the present invention, the light shield is installed only in the above position (range).
The light-shielding property against external light is not different from that of the conventional light-shielding body type of this type, and of course, the light-shielding body is formed with a light-transmitting window extending in the front and lower portions of the front. Further, direct light emission from the light bulb toward the front can be performed without any support, and the lighting state of the light emitting portion (filament) of the light bulb can be directly visually recognized even from an obliquely lower position, so that the visibility from the lower side is further improved.

Further, since the upper surface side of each of the light shielding plates constituting the light shielding body is a black light shielding surface and the lower surface side is a white or mirror-finished reflecting surface, the intruding external light is absorbed by the upper light shielding surface. The reflected light (scattered light) emitted from the light source and once reflected by the reflecting mirror is reflected downward by the reflection surface on the lower surface side and is emitted to the outside, so that the amount of light emitted downward is increased. The visibility from is improved.

In the above case, refraction of the light from the prism portion of the front lens can reliably guide external light coming from above and near the horizontal to the light-shielding surface and block the light emitted to the outside. With respect to (reflected light), an increase in the amount of light downward can be expected, so the visibility of the signal lamp can be further enhanced.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a traffic signal light according to a first embodiment of the present invention.

FIG. 2 is a diagram of FIG. 1 viewed from the front.

FIG. 3 is an enlarged cross-sectional view of a main part of FIG.

FIG. 4 is a side sectional view showing another embodiment of the traffic signal light of the present invention.

FIG. 5 is a diagram of FIG. 4 viewed from the front.

[Explanation of symbols]

1 Reflector 1a Effective bottom of reflector 1b Effective top of reflector 1d Effective reflector of reflector 2 Light bulb 3 Filament (light emitting part) 3b Top of filament 3a Bottom of filament 3c Filament center 4 Front lens 4d Parabolic lens 4 Arbitrary radius above r ₁ point 4e Arbitrary radius r ₂ point on parabolic lens 4 r ₁ Arbitrary radius on front lens determined from angle seen from below r ₂ Arbitrary on front lens determined from angle seen from above Radius 7 Light-shielding body 8 Light-shielding plate 8a Light-shielding surface 8b Reflecting surface 8c Hole

Claims (1)

[Claims] 1. A traffic signal lamp comprising a parabolic reflector (1), a light source (2), a colored front lens (4), and a light shield (7). ) Has a prism portion (4c) that refracts external light downward, the reflecting mirror (1) is located behind the light bulb (2), and the light shield (7) has a black light-shielding surface ( 8a),
Reflective surface (8b) with white or mirror-finished bottom surface
And a plurality of horizontal light-shielding plates (8) are arranged side by side in the vertical direction. Further, the light-shielding body (7) is located at one side from the center (3c) of the filament (3) of the light-emitting part of the light bulb (2). Edge (3b
Or 3a) and the end (1a or 1b) located on the other (3a or 3b) side of the center (3c) of the light emitting part (3) from the center of the effective paraboloid (1d) of the reflecting mirror (1). It is located in front of the line, and also one end (3b or 3a) from the center (3c) of the filament (3) of the light emitting part of the light bulb (2).
And a point (4e or 4d) in the same direction that is arbitrarily determined within the effective radius of the front lens (4), and is disposed behind the line, and in the center of the light shield (7). A traffic signal light having a hole (8c) larger than the diameter of the light bulb (2).