JP2010040247A - Lighting fixture - Google Patents

Abstract

A lighting apparatus that produces a bright portion not only directly under a lighting apparatus but also in the vicinity thereof.
A columnar substrate having a first arrangement surface and a second arrangement surface on a side surface, a plurality of first LEDs and a plurality of second LEDs, and the plurality of first LEDs having the same optical axis direction. As described above, the plurality of second LEDs are arranged in a row in the longitudinal direction of the base on the second placement surface so that the optical axis directions thereof coincide with each other on the first placement surface. The angle between the optical axis direction of the first LED and the optical axis direction of the second LED is smaller than a value obtained by dividing the sum of the first spreading angle of the first LED and the second spreading angle of the second LED by 2 .
[Selection] Figure 6

Description

  The present invention relates to a luminaire for illuminating, for example, a roadway.

Conventionally, a fluorescent lamp with a waterproof structure is used on the ceiling as illumination in the tunnel. There are various types of fluorescent lamps.
JP 2007-328963 A

  A normal fluorescent lamp has a life of about 8000 hours. Also, in tunnels that are laid with communication cables, the life time is further shortened due to condensation, and fluorescent lamps are frequently turned off. If the fluorescent lamp is turned off during work in the road, work will be hindered from the viewpoint of safety. In addition, the fluorescent lamp replacement work cost is also required.

  Therefore, it is conceivable to use a light emitting diode (hereinafter simply referred to as “LED”) instead of a fluorescent lamp. LEDs have a lifespan of about 40,000 hours, require little replacement, and are small and light, so replacement work costs are low. In addition, compared with fluorescent lamps, it consumes less power and has high illuminance.

  FIG. 1 shows a simplified cross-sectional view of an illumination space when an LED is used. A portion indicated by a one-dot chain line is an illumination space. In the example of FIG. 1, the base 2 is installed on the ceiling of the road, and the LEDs 4 are arranged on one surface of the base 2 in a row in the back direction of FIG. 1. The illumination light of the LED has a high directivity, that is, the illumination light has a small divergence angle θ (described in FIG. 1) and a narrow range of irradiation. Therefore, with respect to the surface to be illuminated, the illumination light strikes only directly below the LED 4 (the thick line portion in FIG. 1), and the illumination light does not strike the periphery. Therefore, there is a problem in safety when working in a dark part (periphery). In the following description, a region on the irradiated surface that is irradiated with illumination light is referred to as a bright portion, and a region that is not irradiated with illumination light is referred to as a dark portion.

  Therefore, as shown in FIG. 2, in order to widen the bright part, it is conceivable to install a thin dome-shaped and translucent acrylic plate 6 so as to surround the LED 4. By installing the acrylic plate 6, the spread angle θ of the illumination light can be increased (denoted as θ ′ in FIG. 2), and the illumination light can be illuminated not only directly below but also around the periphery. However, there is a problem that the illumination light from the LED 4 passes through the acrylic plate 6 to reduce the illuminance of the illumination light, and there is a problem that the material cost and processing cost of the acrylic plate 6 are increased.

  An object of the invention of the present application is to provide a lighting apparatus that can simultaneously achieve a long life, low power consumption, high illuminance, low dark area, low manufacturing cost and low replacement cost.

  The lighting fixture of the present invention includes a columnar base having a first arrangement surface and a second arrangement surface on a side surface, a plurality of first LEDs, and a plurality of second LEDs. The plurality of first LEDs are arranged in a row in the longitudinal direction of the base on the first arrangement surface so that the optical axis directions thereof coincide with each other. The plurality of second LEDs are arranged in a row in the longitudinal direction of the base on the second arrangement surface so that the optical axis directions coincide with each other. The angle formed by the optical axis direction of the first LED and the optical axis direction of the second LED is smaller than a value obtained by dividing the sum of the first spreading angle of the first LED and the second spreading angle of the second LED by 2.

  With the lighting fixture having the above-described configuration, it is possible to illuminate the illumination light not only directly below but also in the periphery, and the dark portion can be reduced. Moreover, since LED is used, the said lighting fixture becomes long life, low power consumption, and high illumination intensity. In addition, since the luminaire has a long life, it is not necessary to replace the luminaire, resulting in a low replacement cost. Moreover, since the structure of the lighting fixture is simple, the manufacturing cost is low.

  The best mode for carrying out the invention will be described below. In addition, the same number is attached | subjected to the process which performs the structure part which has the same function, and the same process, and duplication description is abbreviate | omitted.

  FIG. 3 is a perspective view of the lighting apparatus 100 of the first embodiment. FIGS. 4A, 4B, and 4C each have the lighting apparatus 100 mounted on the mounting base 200 and α when the cover 700 (described later) is mounted. The top view (henceforth a "trihedral view") seen from direction, (beta) direction, and (gamma) direction is shown. The luminaire of the present invention illuminates, for example, a working area in the road and is installed above the illuminated surface (for example, the ceiling of the road). The work area is the side surface of the ground or the road that is the surface facing the ceiling. The lighting fixture 100 of this embodiment includes a plurality of first LEDs 102, a plurality of second LEDs 104, and a base 106. In this embodiment, LED chips are used as the first LED 102 and the second LED 104, respectively, but normal LEDs may be used. In this embodiment, the base 106 has a triangular prism shape, and two of the side surfaces of the base 106 are a first placement surface 106a and a second placement surface 106b, and the remaining one surface is a mounting surface 106c. The plurality of first LEDs 102 are arranged on the first arrangement surface 106a along the longitudinal direction of the base 106 so that the respective optical axis directions coincide with each other, and the plural second LEDs 104 are arranged so that the respective optical axis directions coincide with each other. In addition, it is arranged along the longitudinal direction of the base 106 on the second arrangement surface 106b (see FIGS. 4A and 4B). Since FIG. 3 is simplified, the number of first LEDs shown in FIG. 3 is smaller than that of the first LEDs shown in FIG. A plurality of first LEDs and second LEDs arranged in a row are collectively referred to as a first LED row 1020 and a second LED row 1040, respectively. In addition, as the shape of the substrate, it may be a columnar shape having at least the first arrangement surface, the second arrangement surface, and the attachment surface on the side surface. It's easy to do.

  Next, the mounting base 200 will be described. In this example, the mounting base 200 includes a mounting plate 202, a first fixing portion 204, a second fixing portion 212, a power supply portion 206, and a cable housing portion 208. Of the two surfaces of the mounting plate 202, one surface is the mounting surface 202a and the other surface is the opposite surface 202b. And the 1st fixing | fixed part 204 is attached and fixed to the end of the opposite surface 202b. And the cable accommodating part 208 is attached and fixed to the end surface 202c on the opposite side to the side in which the 1st fixing | fixed part 204 is installed among the both end surfaces of the attachment board 202. FIG. In this example, the cable housing portion 208 has a rectangular parallelepiped shape, and the second fixing portion 212 is attached and fixed at a position facing the first fixing portion 204 on one of the six surfaces. A power supply unit 206 is attached to a position from the cable housing unit 208 from the center of the opposite surface 202b.

  FIG. 5 shows a simplified circuit diagram. The plug 210 supplies power from the outside to the power supply unit 206. In this example, the plug 210 has a three-layer structure. The power supply unit 206 converts the input current from alternating current to direct current, and supplies the direct current to the first LED array 1020 and the second LED array 1040. In this example, the first LED row 1020 and the second LED row 1040 are connected in series in this order.

  The cable storage unit 208 stores a cable protection tube that protects the cable from the plug 210 to the power supply unit 206 and the cable from the power supply unit 206 to the first LED row 1020. The cable housing portion 208 and the power source portion 206 are waterproofed. Further, the first fixing portion 204 and the second fixing portion 212 are provided with notches 204a and 212a, respectively, and are fixed to the ceiling of the road by screws (not shown) penetrating these notches.

  FIG. 6 shows a simplified view of the illumination space when the lighting apparatus 100 is installed on the ceiling 50A of the road 50. In FIG. The illuminated surface in the example of FIG. 6 is the ground surface 50C facing the ceiling 50A and the side wall surface 50B of the trail. It is assumed that the plurality of first LEDs 102 and the plurality of second LEDs 104 are arranged in a row in the depth direction of FIG. As shown in FIG. 6, in the configuration of the lighting fixture 100 described above, the first LED and the first optical axis 102a of the first LED 102 and the second optical axis 104a of the second LED 104 are separated from each other toward the surface to be illuminated. The second LED will be arranged.

Here, a description will be given of the relationship with the first optical axis 102a and the second optical axis 104a and the first divergence angle theta ₁ angle ω and brother 1LED formed by a second spread angle theta ₂ of the second 2LED. The angle ω indicates an angle formed by the direction of the first optical axis 102a and the direction of the second optical axis 104a when viewed in a cross section as shown in FIG. In addition, the illumination space formed by the illumination light from the first LED and the second LED has a substantially conical shape, and the cone buses for the illumination space formed by the illumination light from the first LED and the second LED are the first bus 102c and the second bus, respectively. The bus line 104c is used. The first spread angle θ ₁ is a value obtained by doubling the angle θ _1/2 formed by the first optical axis 102a and the bus 102c. Similarly, the second spread angle theta ₂ is the angle theta _2/2 forming a second optical axis 104a and bus 104c is twice the value. Ω is smaller than a value obtained by dividing the sum of the first spread angle θ ₁ and the second spread angle θ ₂ by 2, that is, the following equation (1) may be satisfied.
ω ≦ (θ ₁ + θ ₂ ) / 2 (1)

Here, the basis of the formula (1) will be described. Bright parts generated by illuminating the surface to be illuminated by one first LED 102 and one second LED 104 are denoted by 102b and 104b, respectively. A bright part where the bright part 102b and the bright part 104b overlap is referred to as an overlapping bright part 300. If ω, θ ₁ , and θ ₂ are determined so that the overlapping bright portion 300 is generated, a bright portion is generated immediately below the lighting fixture 100 and a bright portion is also generated in the vicinity. As a result, safety is improved in the work of the operator.

In the case of ω = (θ ₁ + θ ₂ ) / 2, that is, in the description of FIG. 6, when the first bus line and the second bus line are indicated by two-dot chain lines, the overlapping bright portion 300 is calculated in terms of the calculation. Does not occur. However, considering the difference between the distance between the first LED and the second LED (several centimeters) and the distance between the lighting fixture 100 and the ground 50C (about 2 m), the portion directly below the lighting fixture 100 also has sufficient illuminance. Therefore, it can be understood that the expression (1) should be satisfied.

  In the above description, an example in which a plurality of first LEDs and a plurality of second LEDs are arranged in a line on the first arrangement surface and the second arrangement surface, respectively, has been described. The number of rows in which the plurality of first LEDs and the plurality of second LEDs are arranged may be two or more, but the light portion can be widened most efficiently by arranging them in one row.

  In addition, the fluorescent light can be selected from a plurality of types of luminescent colors, and the type of LED phosphor can be used to select illumination light according to the application (for example, color rendering improvement, daylight, or light bulb color). Moreover, although the said lighting fixture 100 becomes another power supply by attaching the dummy mouthpiece compatible with a fluorescent lamp to both ends, it can also be put into the conventional mounting fixture (for fluorescent lamps).

  It has been experimentally found that with this luminaire configuration, power can be reduced by 20 percent compared to fluorescent lighting, and the cross-sectional area of the cable for supplying power can be halved. And as above-mentioned, compared with fluorescent lamp illumination, the lifetime as a lighting fixture can be prolonged and replacement construction cost etc. become cheap.

  Also, the illuminance can be increased as compared with fluorescent lamp illumination. Moreover, it becomes long life and high illumination intensity on the characteristic of LED. Further, in consideration of the directivity of the LEDs, by arranging the LEDs in two rows, it is possible not only to make the bright part just under the lighting fixture, but also to make the periphery of the bright part a bright part. Therefore, the dark part can be reduced and the safety is improved.

  In addition, when the base has a triangular prism shape, since the base has a simple structure, the cost for creating the base can be reduced. Then, arranging the first LED row and the second LED row on the first arrangement surface and the second arrangement surface is easy and the arrangement cost is low.

  Further, when two rows of LEDs are arranged (that is, a plurality of first LEDs and a plurality of first LEDs are arranged in a row, respectively), the number of LEDs can be reduced while expanding the illumination area. Therefore, it is suitable when it is desired to reduce the manufacturing cost.

  That is, with the configuration of the lighting fixture of this embodiment, it is possible to simultaneously achieve a long life, low power consumption, high illuminance, few dark parts, and low manufacturing costs.

[Modification]
FIG. 7 shows an illumination space of a lighting fixture 500 which is a modification of the lighting fixture. As shown in FIG. 7, the base may have a substantially semi-cylindrical shape having a curved surface. In FIG. 7, the base and the curved surface of the lighting fixture 500 are indicated as 600 and 600a, respectively. In this case, the first LED row 1020 and the second LED row 1040 may be arranged on the curved surface 600a. And if it also comprises the lighting fixture 500 so that the said Formula (1) may be satisfy | filled, the same effect as the lighting fixture 100 described in Example 1 can be acquired.

  LEDs are generally exothermic. In some cases, this heat generation may cause danger to the worker who works in the road, and the heat generation may cause a problem in the lighting fixture. Therefore, in the second embodiment, a material having high thermal conductivity (for example, aluminum) is used as a material for the bases 106 and 600. In this way, by dissipating the heat generated by the LED through the base 106 and the base 600, it is possible to prevent the operator's safety and the trouble of the lighting fixture.

  In this third embodiment, the lighting fixture described in the first and second embodiments is provided with a waterproof structure. FIG. 8 and FIG. 9 show the lighting fixture 100 and the lighting fixture 500 covered with a cover portion 700, respectively. The cover part 700 has translucency and waterproofness, and is, for example, a transparent acrylic plate. In this example, the shape of the cover portion 700 is a thin hollow hexagonal columnar shape, but is not limited to this shape. In addition, since the cover part 700 of a present Example is not calculated | required by the effect which spreads the light from LED, since it can be made thinner than the acrylic board 6 shown in FIG. 2, the problem that illumination intensity falls hardly arises.

  Conventional fluorescent lamp illumination has to be frequently replaced, and the cover 700 used for waterproofing is also attached to the fluorescent lamp in a detachable state. Accordingly, a gap is generated, and liquid or the like enters from the gap, so that the waterproofness is not perfect. However, the lifetime of the LED is 40000 hours, which is longer than that of the conventional fluorescent lamp illumination, and the replacement work is hardly required. Therefore, instead of attaching the cover 700 in a detachable state, the cover 700 can be attached integrally with the mounting base 200, and the lighting fixture 100 can be completely covered. Therefore, a liquid such as rainwater does not enter the cover portion 700, and a waterproof process with higher waterproofness than conventional fluorescent lamp illumination can be performed.

  Moreover, the illumination light from LED can be made more uniform by giving the outer surface 700a of the cover part 700 a frost process (a process which makes a fine unevenness | corrugation in the surface, and makes it frosted glass-like).

[Specific use mode]
Next, the case where the lighting fixture mentioned above is used in the way is demonstrated. In the following description, a case where the lighting fixture 100 is used will be described. The traveling direction of the path and the longitudinal direction of the base 106 (arrangement direction of the plurality of first LEDs and the plurality of second LEDs) are vertical (first usage mode) or parallel (second usage mode). The lighting fixture 100 is arranged so that

  The first usage mode is shown in FIG. In the example of FIG. 10, the luminaire 100 is installed such that the traveling direction of the path is perpendicular to the arrangement direction of the plurality of first and second LEDs (longitudinal direction of the base 106). And the some lighting fixture 100 is arrange | positioned for every fixed space | interval so that all the work areas of an operator may become a bright part. This mode of use is effective when the width of the path is longer than the length of the base in the longitudinal direction.

  Next, FIG. 11 shows a second usage mode. In the example of FIG. 11, the luminaire 100 is arranged so that the traveling direction of the path is parallel to the arrangement direction of the first LED and the second LED (longitudinal direction of the base 106). This mode of use is effective when the width of the path is shorter than the length of the base in the longitudinal direction. In this way, it is only necessary to change the direction of the lighting fixture in consideration of the width of the road and the location where the bright part is desired.

The figure which showed the illumination space at the time of arranging LED in a line. The figure which showed the illumination space at the time of arranging LED in a line and mounting | wearing with an acrylic board. The perspective view of the lighting fixture of a present Example. FIG. 3 is a three-sided view of the lighting apparatus of the present embodiment. The circuit diagram which simplified the present Example. The figure which showed the illumination space of the lighting fixture of a present Example. The figure which showed the illumination space of the lighting fixture of a modification. The figure which showed the case where the cover part was mounted | worn with the lighting fixture of a present Example. The figure which showed the case where a cover part was mounted | worn with the lighting fixture of a modification. The figure which showed the 1st usage aspect of the lighting fixture in Todo. The figure which showed the 2nd usage condition of the lighting fixture in Todo.

Claims (7)

A columnar base having a first arrangement surface and a second arrangement surface on the side surface;
Comprising a plurality of first LEDs and a plurality of second LEDs;
The plurality of first LEDs are arranged in a row in the longitudinal direction of the base on the first arrangement surface so that the optical axis directions coincide with each other.
The plurality of second LEDs are arranged in a row in the longitudinal direction of the base on the second arrangement surface so that the optical axis directions coincide with each other,
The angle between the optical axis direction of the first LED and the optical axis direction of the second LED is equal to or less than a value obtained by dividing the sum of the first spreading angle of the first LED and the second spreading angle of the second LED by 2. . A columnar base having a curved surface on the side surface;
Comprising a plurality of first LEDs and a plurality of second LEDs;
The plurality of first LEDs are arranged in a row in the longitudinal direction of the base on the curved surface such that the optical axis directions coincide with each other,
The plurality of second LEDs are arranged in a row in the longitudinal direction of the base on the curved surface such that the optical axis directions coincide with each other,
The angle formed by the optical axis direction of the plurality of first LEDs and the optical axis direction of the plurality of second LEDs is equal to or less than a value obtained by dividing the sum of the first spreading angle of the first LED and the second spreading angle of the second LED by 2. Is a lighting fixture. The lighting apparatus according to claim 1,
The lighting device is characterized in that the base has a triangular prism shape. It is a lighting fixture in any one of Claims 1-3,
Each of the plurality of first LEDs and the second LEDs is arranged in a line. It is a lighting fixture in any one of Claims 1-4, Comprising:
The base has a high thermal conductivity. It is a lighting fixture in any one of Claims 1-5,
A luminaire covered with a cover portion having translucency and waterproofness. The lighting fixture according to claim 6,
The surface of the said cover part is frosted, The lighting fixture characterized by the above-mentioned.

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