JP2009181696A - Led indication lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED signal lamp made up of a plurality of LEDs sparsely arranged that achieves excellent visibility. <P>SOLUTION: The LED signal lamp 10 has a plurality of LEDs 20 arranged so that their density as they are sparsely arranged in the LED signal lamp 10 is higher at an outer periphery part of the LED signal lamp 10 than at a center part thereof. Accordingly, brightness that an observer visually recognizes from the LED signal lamp 10 at simultaneous emission of the plurality of LEDs 20 is to be higher at the outer periphery part of the LED signal lamp 10 than at the center part thereof. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an LED indicator lamp in which a plurality of LEDs are discretely arranged on a generally circular support, and more particularly to a technique for improving the visibility of an observer's LED indicator lamp. .

  In recent years, LED indicator lights in which a plurality of LEDs are discretely arranged on a generally circular support have been developed due to technological progress of LEDs (light emitting diodes), and are already in widespread use (for example, see Patent Document 1). .) Examples of this type of LED indicator lamp include a signal lamp (for example, a traffic signal lamp, a railway signal lamp, a maritime signal lamp, etc.), and a display lamp (for example, a tail lamp) mounted on a moving body (for example, an automobile).

JP 2001-356720 A

  The LED display lamp includes the display contents of the LED indicator lamp (for example, the position, color, and shape of the indicator lamp that is lit) even from a distant place (for example, 200 m ahead in the case of a traffic signal lamp). The information (information on whether the indicator light is blinking or continuously lit) can be easily and reliably determined by an observer (for example, a car driver or a pedestrian), and the LED display A clear contrast between the light and the background color is required. That is, the LED display lamp is required to have excellent visibility (attractiveness / eye catching property).

  Against this backdrop, the present invention provides an LED indicator lamp in which a plurality of LEDs are discretely arranged on a support that is generally circular, and that achieves excellent visibility. It was made as an issue.

  The following aspects are obtained by the present invention. Each aspect is divided into sections, each section is given a number, and is described in a form that cites other section numbers as necessary. This is to facilitate understanding of some of the technical features that the present invention can employ and combinations thereof, and the technical features that can be employed by the present invention and combinations thereof are limited to the following embodiments. Should not be interpreted. That is, it should be construed that it is not impeded to appropriately extract and employ the technical features described in the present specification as technical features of the present invention although they are not described in the following embodiments.

  Further, describing each section in the form of quoting the numbers of the other sections does not necessarily prevent the technical features described in each section from being separated from the technical features described in the other sections. It should not be construed as meaning, but it should be construed that the technical features described in each section can be appropriately made independent depending on the nature.

(1) LED indicator lamp,
A generally circular support; and
A plurality of LEDs discretely arranged on the support, and
The plurality of LEDs emit light so that the brightness visually recognized by the observer from the LED indicator light at the time of simultaneous light emission of the plurality of LEDs is higher at the outer periphery of the support than at the center of the support. LED indicator light to be made.

  The present inventor has conducted research in order to improve the visibility of the LED indicator lamp. As a result, the observer visually recognizes the LED indicator lamp from the LED indicator lamp at the time of simultaneous light emission of the plurality of LEDs arranged on the support. When the plurality of LEDs are arranged on the support so that the brightness to be recognized is higher than the central portion at the outer periphery of the support, the plurality of LEDs are arranged so that the brightness is uniform over the entire support. From the case where LED is arrange | positioned to a support body, the knowledge that the observer's visibility of LED indicator light improved was acquired.

  To consider the reason, in general, in a situation where the observer needs to be aware of the presence of the LED indicator lamp, the larger the LED indicator lamp, the easier it is for the observer to find the LED indicator lamp. On the other hand, when the brightness of the outer peripheral part of the LED indicator lamp is higher than the brightness of the central part, the observer physically uses the same size LED display lamp as compared to the case where the brightness of the central part is higher than the peripheral part. There is a tendency to perceive that it is large visually (psychologically).

  In addition, when the luminance of the outer peripheral portion of the LED indicator light is higher than the luminance of the central portion, the observer can more clearly define the outline of the LED indicator light from the background color than when the luminance of the central portion is higher than the luminance of the outer peripheral portion. As a result, there is a tendency to visually recognize the outer shape of the LED indicator more clearly.

  Based on the knowledge described above, in the LED indicator lamp according to this section, the plurality of LEDs arranged on the support are visually recognized from the LED indicator lamp when the plurality of LEDs are simultaneously emitted. To emit light so that the brightness of the outer periphery of the support is higher than that of the center of the support.

  Therefore, according to this LED indicator lamp, the visibility of the observer's LED indicator lamp is improved.

(2) In the item (1), the plurality of LEDs are arranged on the support body so that a density of the LEDs arranged on the support body is higher than a central portion of the support body at an outer peripheral portion of the support body. LED indicator lamp of description.

  As described above, the visibility of the LED indicator lamp is higher when the luminance of the outer peripheral portion of the LED display lamp is higher than the luminance of the central portion than when the luminance of the central portion is higher than the luminance of the outer peripheral portion. On the other hand, when each of the plurality of LEDs is caused to emit light with uniform intensity (not bright or power) in the entire support, in order to make the luminance of the outer peripheral portion of the LED indicator light higher than the luminance of the central portion, It is desirable to arrange a plurality of LEDs on the support so that the density at which the LEDs are arranged on the support is higher than the center of the outer periphery of the support.

  Based on such knowledge, in the LED indicator lamp according to this item, the plurality of LEDs are arranged on the support so that the density of the LEDs arranged on the support is higher than the central portion in the outer peripheral portion of the support. Has been.

  In addition, in this section, there are two terms that define the position on the “support”: “central part” and “outer peripheral part”. For this reason, a plurality of LEDs are It is not appropriate to interpret that the density distributed on the support (hereinafter referred to as “LED distribution density”) changes only in two stages on the support. In the “central part”, it is not essential that the LED distribution density is uniform, and it is allowed to change in the radial direction. Similarly, it is not indispensable that the LED distribution density is uniform in the “outer peripheral portion”, and it is allowed to change in the radial direction.

(3) The plurality of LEDs are arranged on the support so that the distance between the LEDs adjacent to each other in the radial direction is generally shorter than the center of the support at the outer peripheral portion of the support (2 LED indicator lamp as described in item).

  According to this LED indicator lamp, the plurality of LEDs are arranged on the support so that the distance between the LEDs adjacent to each other in the radial direction is generally shorter than the central part at the outer periphery of the support, thereby The brightness | luminance of the said LED indicator lamp is implement | achieved in the outer peripheral part of a support body higher than the center part.

(4) The plurality of LEDs are generally arranged on the support so that the distance between the LEDs adjacent to each other in the circumferential direction is shorter than the center of the support at the outer periphery of the support (2 ) Or LED indicator lamp according to item (3).

  According to this LED indicator lamp, the plurality of LEDs are generally arranged on the support so that the distance between the LEDs adjacent to each other in the circumferential direction is shorter than the central part at the outer periphery of the support, The brightness | luminance of the said LED indicator lamp is implement | achieved in the outer peripheral part of a support body higher than the center part.

(5) The plurality of LEDs have different power levels in the outer peripheral portion so that the intensity of light emitted from the plurality of LEDs is higher than the central portion of the support in the outer peripheral portion of the support. The LED indicator lamp according to any one of (1) to (4), which is driven by being supplied to the LED and the LED in the central portion.

  As described above, the visibility of the LED indicator lamp is higher when the luminance of the outer peripheral portion of the LED display lamp is higher than the luminance of the central portion than when the luminance of the central portion is higher than that of the outer peripheral portion. On the other hand, in the case where the plurality of LEDs are distributed at a uniform density throughout the support, each of the plurality of LEDs is provided in order to make the luminance of the outer peripheral portion of the LED indicator lamp higher than the luminance of the central portion. It is desirable to emit light so that the light intensity of the LED is higher at the outer peripheral portion of the support than at the central portion thereof.

  Based on such knowledge, in the LED indicator lamp according to this section, the power of different magnitudes is such that the intensity of light emitted from the plurality of LEDs is higher than the central portion in the outer peripheral portion of the support. A plurality of LEDs are driven by being supplied to the LEDs in and the LEDs in the center.

  Here, the definition of “luminance” and “intensity” in the present specification will be described. “Luminance” is a case where an observer looks at the whole of a plurality of LEDs. The term “intensity” refers to the brightness of light when the observer perceives the brightness under the influence of the brightness of the light from the surrounding LEDs. It is a term that means the brightness of light when the brightness is measured without being affected by the brightness of light from the surrounding LEDs. Therefore, “brightness” is the overall brightness of a plurality of adjacent LEDs, whereas “intensity” is the brightness of a single LED.

(6) Further, a mode in which the plurality of LEDs are lit, a normal mode in which all the LEDs are lit at a reference intensity set for each LED, and an outer peripheral portion of the support body among the LEDs are arranged. (1) to (5) includes a control device that switches to a power-saving mode in which a device is lit at the reference intensity, but is not lit at a central portion of the support or is lit at an intensity lower than the reference intensity. LED indicator lamp in any one of item | terms.

  In this LED indicator lamp, the brightness recognized by the observer is higher at the outer peripheral part of the support than the central part thereof, so that only a part of the LED can be lit while maintaining the function of the LED indicator lamp as much as possible. When necessary, it is preferable to light the LEDs arranged on the outer periphery of the support rather than lighting the LEDs arranged in the center of the support.

  Based on such knowledge, according to the LED indicator lamp according to this section, a mode in which a plurality of LEDs are lit, a normal mode in which all the LEDs are lit at a reference intensity set for each LED, and the LEDs Among them, those arranged on the outer periphery of the support light up at the reference intensity, but those arranged in the central part of the support do not turn on or turn on at an intensity lower than the reference intensity and Can be switched to.

  In addition, the technology for switching the mode in which a plurality of LEDs are lit to the normal mode and the power saving mode is used when the brightness of the LED indicator light is distributed in a pattern that increases more in the central portion of the outer periphery of the support. Not limited to this, even when the brightness of the LED indicator light is uniformly distributed over the entire support or when the brightness of the LED indicator light is distributed in a pattern that increases more at the outer periphery of the center of the support, It is effective to realize.

(7) The LED indicator according to (6), wherein the control device always selects the normal mode, but selects the power saving mode in an emergency.

  Electric power is required to turn on the LED indicator lamp, but power saving may be necessary in an emergency such as a disaster. On the other hand, if the “power saving mode” in the above item (6) is selected, it is possible to reduce the power consumption while suppressing the function deterioration of the LED indicator lamp.

  Based on such knowledge, according to the LED indicator lamp in this section, the normal mode is always selected as the mode in which the plurality of LEDs are lit, but the power saving mode is selected in an emergency.

(8) LED indicator lamp,
A generally circular support; and
A plurality of LEDs discretely arranged on the support, and
The plurality of LEDs are LED indicator lamps arranged on the support body so that the density of the LEDs arranged on the support body is higher than the central part of the support body at the outer peripheral portion of the support body.

  According to this LED indicator lamp, the visibility of the LED indicator lamp of the observer is improved by optimizing the LED distribution density.

  Hereinafter, some of more specific embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a front view of an LED signal lamp 10 according to the first embodiment of the present invention. This LED signal lamp 10 is used for, for example, a three-lamp type traffic signal or a one-lamp blinking type traffic signal. As shown in FIG. 1, in this LED signal lamp 10, a plurality of LEDs (light emitting diodes) 20 as a plurality of point light sources that emit light of the same color are spatially discretely arranged. These LEDs 20 are turned on all at once in response to a lighting command from a central control device described later.

  FIG. 2 shows the LED signal lamp 10 in a side sectional view. The LED signal lamp 10 includes a case 22 having a generally circular container shape. A synthetic resin mounting plate 24 having a generally circular shape is airtightly attached to the case 22. Specifically, a rubber packing 26 is airtightly attached to the outer peripheral edge of the mounting plate 24 so as to cover the entire periphery of the mounting plate 24, and the outer peripheral edge of the mounting plate 24 is attached to the case 22 via the packing 26. Mounted on the outer periphery.

  A plurality of LEDs 20 are discretely mounted on the mounting plate 24 over the entire surface thereof. The LEDs 20 are arranged side by side along a plurality of concentric circles, and are arranged at equal intervals on the same concentric circle. In order to position the LEDs 20, the same number of through holes 30 as the LEDs 20 are formed in the mounting plate 24. As shown in an enlarged cross-sectional view in FIG. 3, one LED 20 is allowed to pass through each through hole 30 leaving a slight gap. Thereby, LED20 is positioned by the corresponding through-hole 30. FIG.

  As shown in FIGS. 2 and 3, the mounting plate 24 is integrally formed with an eave 32 having a generally cylindrical shape for each through hole 30. The eaves 32 are formed on the mounting plate 24 so as to protrude from the front surface of the mounting plate 24 at a right angle.

  As shown in FIGS. 3 and 4, this eaves 32 is a portion of the LED 20 positioned by the corresponding through hole 30 (hereinafter referred to as “corresponding LED 20”) that protrudes at a right angle from the front surface of the mounting plate 24. The mounting plate 24 is formed so as to cover from the upper surface thereof. The eaves 32 has an inner peripheral surface extending along the length of the corresponding LED 20, and the inner peripheral surface is in contact with the outer peripheral surface of the corresponding LED 20. Therefore, the eaves 32 facilitates the accuracy of the direction in which each LED 20 extends with respect to the mounting plate 24.

  As shown in FIGS. 2 and 3, a printed circuit board 34 is disposed behind the mounting plate 24 in parallel therewith. The printed circuit board 34 is fixed to the case 22 by a fixture (not shown). A conductive pattern 36 is formed on the printed circuit board 34, and a lead frame 38 extending from each LED 20 mounted on the mounting plate 24 is soldered to the conductive pattern 36.

  As shown in FIG. 2, a transparent synthetic resin cover 40 that is curved in a generally convex shape to form a plate shape is attached to the front surface of the mounting plate 24. Specifically, the outer peripheral edge of the cover 40 is airtightly attached to the outer peripheral edge of the mounting plate 24. The cover 40 covers the entire front surface of the mounting plate 24. Light emitted from the plurality of LEDs 20 mounted on the mounting plate 24 passes through the cover 40.

  In the LED signal lamp 10, the plurality of LEDs 20 are arranged such that the luminance visually recognized by the observer from the LED signal lamp 10 at the time of simultaneous light emission of the plurality of LEDs 20 is higher than the central portion in the outer peripheral portion of the mounting plate 24. However, it arrange | positions at the attachment plate 24 so that the density arrange | positioned at the attachment plate 24 may become higher in the outer peripheral part of the attachment plate 24 than the center part.

  Specifically, as shown in the graph of FIG. 5, in the plurality of LEDs 20, the radial pitch, which is the distance between the LEDs 20 that are generally adjacent to each other in the radial direction, is shorter than the central portion in the outer peripheral portion of the mounting plate 24. As shown in FIG. In this embodiment, as illustrated graphically in FIG. 5, the radial pitch decreases generally continuously (with three or more steps) as it moves radially outward from the center point of the mounting plate 24. Thus, a plurality of LEDs 20 are arranged on the mounting plate 24.

  Further, the plurality of LEDs 20 are arranged on the mounting plate 24 so that the circumferential pitch, which is the distance between the LEDs 20 that are generally adjacent to each other in the circumferential direction, is shorter at the outer peripheral portion of the mounting plate 24 than the central portion thereof.

  As a result, as shown in the graph of FIG. 6, the luminance of the LED signal lamp 10 is higher in the outer peripheral portion of the mounting plate 24 than in the central portion at the time of simultaneous light emission of the plurality of LEDs 20. Therefore, according to this LED signal lamp 10, it is possible to observe the brightness more than the case where the luminance is distributed so as to be higher in the central portion of the mounting plate 24 than the outer peripheral portion, rather than the case where the luminance is uniformly distributed in the entire mounting plate 24. The visibility of the LED signal lamp 10 is improved.

  As is clear from the above description, in the present embodiment, for convenience of explanation, the LED signal lamp 10 constitutes an example of the “LED indicator lamp” according to the item (1), and the mounting plate 24 is the item (1). The region in which a plurality of LEDs 20 arranged along the three concentric circles located on the outermost side in FIG. 1 are arranged in the mounting plate 24 is the “support” in FIG. It can be considered that an example of the “outer peripheral part” is configured, and the remaining area of the mounting plate 24 configures an example of the “central part” in the same section.

  In addition, in the present embodiment, in order to allow the plurality of LEDs 20 to emit light so that the luminance of the LED signal lamp 10 is higher than the central portion in the outer peripheral portion of the mounting plate 24, The LEDs 20 are arranged on the attachment plate 24 so that the density of the LEDs 20 on the attachment plate 24 is higher than the central portion of the outer periphery of the attachment plate 24. That is, a technique of non-uniform LED distribution density is employed.

  On the other hand, the plurality of LEDs 20 have different powers such that the intensity of light emitted from the plurality of LEDs 20 is higher than the central portion in the outer peripheral portion of the mounting plate 24. And the plurality of LEDs 20 in the central portion are driven, and as a result, the plurality of LEDs 20 emit light so that the luminance of the LED signal lamp 10 is higher than the central portion in the outer peripheral portion of the mounting plate 24. It is possible to carry out the present invention in such a manner. That is, the present invention can be implemented in a mode in which the technique of non-uniform LED intensity distribution is employed. However, the technique of non-uniformity of the LED intensity distribution can be used as a replacement or additionally to the technique of non-uniformity of the LED distribution density described above.

  Next, a second embodiment of the present invention will be described. However, this embodiment has many elements in common with the first embodiment, and the only difference is the element related to the pattern in which a plurality of LEDs are arranged in the LED signal light, so only the different elements will be described in detail. Common elements are cited using the same reference numerals or names, and redundant description is omitted.

  FIG. 7 shows a front view of the LED signal lamp 60 according to the present embodiment. The pattern in which the plurality of LEDs 20 are arranged in the LED signal lamp 60 is not the same as the pattern in which the plurality of LEDs 20 are arranged in the LED signal lamp 10 shown in FIG. 1, but the luminance of the LED signal lamp 60 is that of the LED signal lamp 60. This is common in that the luminance distribution is higher at the outer peripheral portion than at the central portion.

  As shown in the graph of FIG. 8, in this embodiment, the radial pitch between the LEDs 20 adjacent to each other changes in a pattern different from the change pattern shown in the graph of FIG. Specifically, in the present embodiment, the radial pitch changes more discontinuously than the radial pitch in the first embodiment.

  More specifically, in the present embodiment, the radial pitch changes in two stages. In other words, the radial pitch has a central portion including the center point of the mounting plate 24 in the entire area of the mounting plate 24. And the outer peripheral portion including the outer peripheral circle of the mounting plate 24, a long radial pitch commonly assigned to the plurality of LEDs 20 disposed in the central portion, and a plurality of disposed in the outer peripheral portion. There are only two, with a short radial pitch commonly assigned to the LEDs 20.

  In the present embodiment, as shown by a graph in FIG. 9, the luminance of the LED signal lamp 60 is higher in the outer peripheral portion of the mounting plate 24 than in the central portion at the time of simultaneous light emission of the plurality of LEDs 20. Therefore, according to this LED signal lamp 60, compared with the case where the brightness is distributed so as to be higher in the central portion of the mounting plate 24 than the outer peripheral portion, compared with the case where the luminance is uniformly distributed over the entire mounting plate 24, the observer. The visibility of the LED signal lamp 60 is improved.

  When the luminance distribution pattern shown in FIG. 9 is compared with the luminance distribution pattern shown in FIG. 6, the increase gradient of the luminance at the outer peripheral portion of the LED signal lamp 60 is steeper in the former than in the latter. As a result, as easily expected from FIG. 7, the boundary between the low and high luminance regions in the LED signal lamp 60 shown in FIG. 7 is high and the low luminance region in the LED signal lamp 10 shown in FIG. The boundary between the regions is prominent.

  Next, a third embodiment of the present invention will be described. However, this embodiment has many elements in common with the first embodiment or the second embodiment, and is different because only the elements for changing the mode of lighting a plurality of LEDs in the LED signal lamp are different. Only the elements will be described in detail, and common elements will be referred to using the same reference numerals or names, thereby omitting redundant description.

  In FIG. 10, a traffic signal 80 according to the present embodiment is conceptually represented in a block diagram together with a central control device 82 that remotely commands the traffic signal 80. The traffic signal 80 uses three LED signal lights 10 that emit different colors. All the LED signal lights 10 have the same configuration as the LED signal light 10 according to the first embodiment.

  The traffic signal device 80 according to the present embodiment further uses a control device 84 that controls turning on / off of the LED signal lights 10. The traffic signal 80 can communicate with the central control device 82 via the control device 84. The central control device 82 sends a command to the traffic signal 80 to the control device 84 by wire or wireless.

  The control device 84 controls the lighting / extinguishing state of each LED signal lamp 10 according to a command received from the central control device 82 by a well-known method.

In the present embodiment, the traffic signal 80 is always operated by power supplied from a power company (not shown). However, in the event of an emergency when the power supply from the power company is cut off, the traffic signal 80 is nevertheless. In order to be able to operate temporarily, an auxiliary power source (for example, a power source that requires power saving for continuous use, such as a battery or a generator) 86 is installed for each traffic signal 80. Yes.

  Therefore, in this embodiment, the traffic signal 80 is operated by the power supplied from the auxiliary power source 86 without depending on the power company in an emergency.

  In the present embodiment, as a mode in which the plurality of LEDs 20 are lit, all the LEDs 20 are arranged in a normal mode in which the LEDs 20 are lit at the reference intensity set for each LED 20 and the outer periphery of the mounting plate 24 among the LEDs 20. Only the one (a plurality of LEDs 20 arranged on the three outermost concentric circles in the LED signal lamp 10 shown in FIG. 1) has a power saving mode in which each LED 20 is lit at the reference intensity set. .

  In the present embodiment, a common reference intensity is set for all the LEDs 20. Accordingly, all the LEDs 20 are supplied with the same amount of power when they are turned on.

  Further, the control device 84 always selects the normal mode based on the information received from the central control device 82, but selects the power saving mode in an emergency.

  FIG. 11 conceptually shows the operation of the control device 84 in a flowchart. First, in step S1, a signal indicating whether or not an emergency has occurred is input from the central control device 82, and whether or not an emergency has occurred is determined based on the signal.

  This time, assuming that it is not an emergency, the normal mode is selected as the mode in which the plurality of LEDs 20 are lit in step S2. In contrast, assuming that this time is an emergency, in step S3, the power saving mode is selected as the mode in which the plurality of LEDs 20 are lit.

  Therefore, in an emergency, the power saving mode is selected, and as a result, when it is necessary to turn on each LED signal lamp 10, it is arranged on the outer periphery of the LED signal lamp 10 among all the LEDs 20 in the LED signal lamp 10. Only things are lit at once.

  Therefore, according to the present embodiment, since the luminance of each LED signal lamp 10 is higher at the outer peripheral portion than its central portion, it is possible to suppress a decrease in the function (visibility) of the LED signal lamp 10 in an emergency where power saving is required. However, the power consumption can be reduced.

  As described above, some of the embodiments of the present invention have been described in detail with reference to the drawings. However, these are exemplifications, and are based on the knowledge of those skilled in the art including the aspects described in the section of [Disclosure of the Invention]. The present invention can be implemented in other forms with various modifications and improvements.

It is a front view which shows the LED signal lamp 10 according to 1st Embodiment of this invention. It is side surface sectional drawing which shows the LED signal lamp 10 shown in FIG. It is side surface sectional drawing which expands and shows the part relevant to typical LED20 among the attachment board 24 and the printed circuit board 34 which comprise the LED signal lamp 10 shown in FIG. It is a front view which expands and shows the part relevant to typical LED20 among the attachment plates 24 which comprise the LED signal lamp 10 shown in FIG. It is a graph showing the pattern in which the radial direction pitch of several LED20 in the LED signal lamp 10 shown in FIG. 1 changes according to a radial direction position. It is a graph showing the pattern from which the brightness | luminance of the LED signal lamp 10 shown in FIG. 1 changes according to a radial direction position. It is a front view which shows the LED signal lamp 60 according to 2nd Embodiment of this invention. It is a graph showing the pattern from which the radial direction pitch of several LED20 in the LED signal lamp 60 shown in FIG. 7 changes according to a radial direction position. It is a graph showing the pattern from which the brightness | luminance of the LED signal lamp 60 shown in FIG. 7 changes according to a radial direction position. FIG. 7 is a block diagram conceptually showing a traffic signal 80 according to a third embodiment of the present invention together with a central control device 82. 11 is a flowchart conceptually showing an operation of a control device 84 shown in FIG.

Explanation of symbols

10 LED signal light 20 LED
24 Mounting plate 60 LED signal light 80 Traffic signal device 82 Control device

Claims (8)

An LED indicator light,
A generally circular support; and
A plurality of LEDs discretely arranged on the support, and
The plurality of LEDs emit light so that the brightness visually recognized by the observer from the LED indicator light at the time of simultaneous light emission of the plurality of LEDs is higher at the outer periphery of the support than at the center of the support. LED indicator light to be made.   2. The LED display according to claim 1, wherein the plurality of LEDs are arranged on the support so that a density of the LEDs arranged on the support is higher than a central portion of the support at an outer peripheral portion of the support. light.   The plurality of LEDs are arranged on the support body so that a distance between LEDs that are adjacent to each other in the radial direction is generally shorter than a central portion of the support body at an outer peripheral portion of the support body. LED indicator light.   The plurality of LEDs are arranged on the support so that the distance between LEDs adjacent to each other in the circumferential direction is generally shorter than the center of the support at the outer peripheral portion of the support. LED indicator lamp of description.   The plurality of LEDs are different in power from the LEDs in the outer peripheral portion so that the intensity of light emitted from the plurality of LEDs is higher in the outer peripheral portion of the support than in the central portion of the support. The LED indicator lamp according to any one of claims 1 to 4, wherein the LED indicator lamp is driven by being supplied to an LED in a central portion.   Furthermore, the mode in which the plurality of LEDs are lit, the normal mode in which all the LEDs are lit at the reference intensity set for each LED, and those LEDs arranged on the outer periphery of the support are 6. A controller according to any one of claims 1 to 5, further comprising a control device that switches on to a power-saving mode that lights up at a reference intensity, but does not illuminate those arranged in the center of the support or lights at a lower intensity than the reference intensity. LED indicator lamp of description.   The LED control lamp according to claim 6, wherein the control device always selects the normal mode, but selects the power saving mode in an emergency. An LED indicator light,
A generally circular support; and
A plurality of LEDs discretely arranged on the support, and
The plurality of LEDs are LED indicator lamps arranged on the support body so that the density of the LEDs arranged on the support body is higher than the central part of the support body at the outer peripheral portion of the support body.

Images