JPH0644768Y2 - Pseudo white signal light using light emitting diode - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a signal light, and particularly to a light emitting diode adapted to a use condition where a viewing angle is narrow and a viewing distance is long, such as when transmitting information to train crews. Relates to a pseudo white light.

(Prior art) Conventionally, the departure signal for trains installed on the station yard, platform, etc., and the lighting signal lights used for level crossing reaction lights that indicate that a train is approaching at a level crossing, indicate the progress of the train. In order to clearly distinguish it from the luminaires that it has, it is white to avoid blue and red, and usually one incandescent lamp is placed in the center of a concave or flat reflective substrate placed behind a white light diffuser called a signal lens. It has a structure with light bulbs.

(Problems to be solved by the invention) Since the above-mentioned signal light uses an incandescent light bulb as an illumination light source, the service life is short for visible signals that constantly flash, usually several months, and in some cases disconnection soon after replacement. However, there is a problem that it is necessary to constantly patroll and look around for safety, and it is not easy to replace a grounded object at a high place.

In order to solve this problem, it is possible to use a semiconductor light emitting element, but when using multicolor semiconductor light emitting chips and arranging them side by side on a plane and using them as a light source, the required amount of light in the axial direction of the front surface In order to emit light, it is necessary to arrange a large number of light emitting chips in high density.

Therefore, there is a problem that the heat generation amount becomes excessive and the light emitting chip itself is damaged unless a large heat dissipation plate or the like is added.

When using a large number of directional high-intensity light-emitting diodes, the yellow light-emitting diode does not provide the required amount of light, and it is difficult to color-code it with the green one in the daytime. Since the red light emitting diode is red, it cannot be used because it is indistinguishable from other red signals indicating other dangers.

It should be noted that there is currently no single light emitting diode having an emission spectrum and light output suitable for a light source for a white signal lamp that can be clearly distinguished from other colored illumination signals.

The object of the present invention is to solve the above problems, and by using a commercially available light emitting diode, the structure is simple, the life of the light emitting body is extremely long, and the light emitting surface looks white so as not to cause any practical problems. An object is to provide a pseudo white signal light using a light emitting diode.

(Means for Solving Problems) Since a railway signal light is generally provided to convey information to a person on board a vehicle on a rail, a place where a crew member visually observes is in front of and on the center line of the signal light. It is within 50m to 200m within 3 degrees to the left and right of the center line.

Therefore, there is a sufficient amount of light to confirm blinking at a position of 200m from the signal light, and the entire light emitting surface of the signal light at a position of 50m from the signal light, focusing on that it only needs to appear as one color close to white, In order to achieve the purpose of the above, the pseudo white signal lamp using the light emitting diode of the present invention is a substrate 1
In a signal lamp having a light source unit on which a large number of light emitting diodes 2,2 ... 2,3,3 ... 3 are attached to form a light emitting surface, the light source units 10 and 20 are mounted on the light emitting diode 2, 2 …… 2,3,3 …… 3 when 3 fire simultaneously,
A plurality of yellow light-emitting diodes 2, 2 ... 2 and one red light-emitting diode 3 are provided for each certain area so that the light-emitting surface can be seen to be close to white from a certain distance or more. A light source unit in which the red light emitting diodes 3, 3, ... 3 are arranged in a group of yellow light emitting diodes 2, 2, ... Further, the place separated by a certain amount or more is a place separated by about 50 m or more, and the certain area of the light emitting surface of the light source unit 10, 20 is 2 cm ² to 9 cm ^2.
And the yellow light emitting diode (2,2 ...
The number of 2) shall be 9 to 15. Furthermore, the peak wavelength of the yellow light emitting diodes 2,2 ... 2 is approximately 570 nm.
So, it is a light emitting diode with a light intensity of about 300 millicandelas under normal use, and red diodes 3,3 ...
3 is a light emitting diode having a peak wavelength of about 660 nm and a light intensity of about 1000 millicandelas in a normal use state.

(Example) Next, this invention is demonstrated in detail with reference to drawings.

FIG. 1 shows an example of the entire configuration of only a light source unit, which is a main part of one embodiment of the present invention. FIG.
The same figure (b) is a front view.

As shown in FIG. 1 (b), the light source unit, which is a feature of the present invention, has a yellow light emitting diode 2, 2, ... The red light emitting diodes 3, 3, ... 3 represented by the shaded circles are attached.

In the present embodiment, the peripheral portion 4 of the substrate 1 is provided with parts such as resistors of a power supply circuit for supplying a current to the light emitting diodes 2, 2, ... 2, 3, 3 ,. However, it is omitted in the figure.

Next, the yellow light-emitting diode 2, 2 used in this example ...
2 and the reason for selecting the characteristics of the red light emitting diodes 3, 3 ... 3 will be described.

Generally, in a signal light for railroad, the position of a person who looks at the signal light does not need to disperse the light in a wide angle because the position of the person who views the signal light is within the range of 3 degrees above and to the front from the center line in the direction of emitting the light from the light source. . Therefore, in this embodiment, a high-brightness light emitting diode with a concave reflecting mirror is used, and a yellow light emitting diode 2,
2 ... 2 uses a light emitting diode with a peak wavelength of 570 nm and a light intensity of 300 mm candela in the standard use state, and a red light emitting diode 3,3 ... 3 has a peak wavelength of 660 nm.
Therefore, a light emitting diode with a light intensity of 1000 mm candela in a standard use state is used.

Next, a combination of the yellow light emitting diodes 2, 2 ... 2 and the red light emitting diodes 3, 3 ... 3 on the light emitting surface will be described.

In general, railway signal lights include colored signal lights of blue, red, etc., which notify whether or not the vehicle can be operated or proceeded, and white signal lights used for signaling or not of departure at a premises or a platform. This white signal light has a clear distinction from a colored signal light, and normally, when viewed from a distance of 50 to 200 m, there is a distinction between lighting and extinguishing light, and it is necessary for it to look almost white.

However, when the light source of this white light is configured by using a light emitting diode to prolong the life, if it is configured by only a yellow diode, the amount of light is insufficient, and blinking can be distinguished only at a distance of about 100 m from the light source. When used in the sun in the daytime, the yellow light emitting diode looks green. In this embodiment, this problem is solved by mixing a red light emitting diode, which has a higher light intensity than the yellow light emitting diode, in the yellow light emitting diode group.

In the light source unit 10 of this embodiment shown in FIG. 1, the yellow light emitting diode 2 or the red light emitting diode 3 is mounted on the printed wiring board 1 via the spacer 5, and the back surface is soldered to the printed wiring. The ratio of the number of the yellow light emitting diodes 2 to the number of the red light emitting diodes 3 is optimally about 10 to 1. When the ratio of the red light emitting diode 3 is larger than that of 9: 1, the red color suddenly appears reddish. Also,
When the number of red light emitting diodes 3 is less than about 15 to 1, green appears gradually in a place where the sun shines in the daytime.

Therefore, in order to always look close to white regardless of whether it is illuminated by the sun at night, during the daytime, or even during the daytime, one red diode should be close to 9 to 15 yellow diodes. It is better to place it.

Next, the specific arrangement of the light emitting diodes and the like will be described.

As mentioned above, it is necessary to mix yellow and red to look like a single color at a location about 50 m away from the signal light, but considering the human eye's distinguishing ability, the distance between the red light emitting diodes 3 is 2 cm or more. 3 cm is enough. In this embodiment, as shown in Fig. 1 (b), and the red light emitting diode 3 for each area 2cm ² ~9cm ² of the light-emitting surface is attached to one and the yellow light emitting diode by about 10. The red light emitting diodes 3 shown by circles with diagonal lines in the figure are arranged so as to be uniformly distributed in the yellow light emitting diodes 2, 2 ... 2 shown by circles in the figure.

It should be noted that no special consideration is given to heat dissipation, and the interval between adjacent light emitting diodes may be appropriate. Even if there is some contact, the heat radiation from the lead wire of the light emitting diode via the spacer 5 shown in FIG. 1 (a) is sufficient.

In this way, on the printed wiring board 1 on which the yellow and red light emitting diodes are mounted, parts such as resistors required for a power supply circuit (not shown) are provided on the periphery of the printed wiring board 1 as shown in FIG. It is attached to and also the zama 6,6 ……
The cover 7 is attached via 6 with screws 8,8.

FIG. 2 is an embodiment of the present invention using the light source unit shown in FIG. 1 and is an example of a starting reaction label displayed in only one direction. The figure (a) is a front view and the figure (b) is a right side view.

FIG. 3 is a right side view showing an example of a bidirectionally displayed starting reaction marker of one embodiment using the light source unit of FIG.

As shown in FIGS. 2 (b) and 3, the light source unit 10 shown in FIG. 1 (enclosed by a broken line in the figure).
Are housed inside a lamp body 11, and a hood 12 is attached to the lamp body 11. As shown in FIG. 2 (a), an acrylic resin filter 13, which is commonly called a lens, is placed on the front surface of each light source unit 10. The filter 13 may be omitted when a high degree of drip-proof performance is required.

FIG. 4 shows another embodiment according to the present invention, which is an example of a crossing action reaction light for alerting a passerby or a passing vehicle at a general level crossing when a train approaches. The figure (a) is the top view and the figure (b) is the front view.

In this case, as shown by the broken line in FIG.
There are four 20,20,20,20, and red light emitting diodes are evenly arranged in the yellow light emitting diode group on the rectangular printed wiring board under the same conditions as the light source unit 10 in FIG. Installed. This light source unit 20,20,2
The reference numerals 0 and 20 are installed in the four light boxes 21, 21, 21, and 21, and the hood 22 is attached to each of the light boxes 21.

The embodiments of the present invention are not limited to those shown in FIGS. 2, 3, and 4, and any of them may be used as long as they are in accordance with the gist of the present invention.

(Effects of the Invention) As described in detail above, the pseudo white signal light using the light emitting diode of the present invention is a high brightness yellow light emitting diode and a red light instead of the incandescent light bulb which is the light source of the conventional white type signal light. By using a light source unit in which light emitting diodes are uniformly arranged by combining them in appropriate proportions, even if the light emitting unit is a simple structure using a commercially available light emitting diode, it is white at normal viewing distance. It has the effect of appearing to be close to, and the service life is extremely longer than that of the conventional white signal light.

[Brief description of drawings]

FIG. 1 is a plan view and a front view showing a light source unit according to an embodiment of the present invention. FIG. 2 is a front view and a right side view showing an example of a starting reaction label as one embodiment using the light source unit shown in FIG. FIG. 3 is a right side view showing another example of the starting reaction label as an embodiment using the light source unit shown in FIG. FIG. 4 is a plan view and a front view showing an example of a crossing operation reaction lamp as another embodiment according to the present invention. 1 ... Printed wiring board 2 ... Yellow light emitting diode 3 ... Red light emitting diode 4 ... Component mounting space 5 ... Spacer 6 ... Zama 7 ... Back cover, 8 ... Screw 10,20 ... Light source unit 11 ... Lamp 12,22 ... Hood 13 … Filter 21… Lightbox

Claims (3)

[Scope of utility model registration request] 1. A large number of light emitting diodes (2,
2. A signal lamp having light source units (10) and (20) having light emitting surfaces formed by attaching 2, ..., 3, 3, ... 3), wherein the light source units (10) and (20) are attached. When the light emitting diodes (2,2 ... 2) and (3,3 ... 3) simultaneously emit light, a plurality of light emitting diodes are provided for each certain area so that the light emitting surface looks like white from a certain distance or more. The yellow light emitting diode (2,2 ... 2) and one red light emitting diode (3) are arranged, and the red light emitting diode is arranged in the yellow light emitting diode (2,2 ... 2) group. A pseudo white signal light using a light emitting diode, which is a light source unit configured by arranging (3,3 ... 3) almost uniformly. 2. The place separated by a certain amount or more is a place separated by about 50 m or more, and the certain area of the light emitting surfaces of the light source units (10), (20) is 2 cm ² to 9 cm ² , The number of yellow light emitting diodes (2,2 ... 2) is 9 to 15 and the utility model registration claim 1
A pseudo white signal lamp using the light emitting diode described in the item. 3. The yellow light emitting diode (2,2 ... 2)
Is a light emitting diode with a peak wavelength of about 570 nm and a light intensity of about 300 millicandelas under normal use conditions. The red light emitting diode (3,3 ... 3) has a peak wavelength of about 660 nm, The pseudo white signal lamp using the light emitting diode according to claim 1, which is a light emitting diode having a light intensity of about 1000 millicandelas in the usage state of.