JP3100808U - Light source for white LED lighting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source for white LED illumination which can guarantee sufficient illuminance even if the number of LEDs is small, can save energy and can be maintenance-free.
SOLUTION: A plurality of required holding holes are provided in a plate surface having a shape corresponding to an illuminating surface of a lighting device lamp main body 1 in a matrix arrangement with a predetermined length pitch. The white LED 11 is inserted and held in each holding hole and fixed at a portion immediately behind the LED chip associated with each electrode portion 12, while the white LED 11 is mounted on the LED substrate 10 arranged immediately after the reflection plate 9. A positive / negative terminal is mounted, and a series-parallel electric network is formed for each of the positive / negative terminals.
[Selection diagram] FIG.

Description

  The present invention relates to a light source for white LED illumination as a light source in a white LED illumination device suitable for use as a street light installed in a plaza such as a road or a park.

  Conventionally, incandescent bulbs, mercury lamps, and fluorescent lamps are used exclusively for lighting in roads and parks, but they consume relatively much power, so they use much less power than fluorescent lamps to save energy. Use of LEDs (Light Emitting Diodes) has been studied. However, LEDs are not suitable for outdoor lighting because of their various characteristics such as point light source type and strong directivity, and they feel dazzling like flashes. There is a typical prior art related to an LED lighting fixture used in the Japanese Patent Application Laid-Open (JP-A) No. 2002-131131.

On the other hand, in order to provide an LED lighting device that is energy-saving and is more suitable for a lighting device such as a street light, the present inventors have previously proposed a new lighting device using an LED as a light source ( For example, see Patent Document 2).

  The lighting fixture of Patent Document 1 has a plurality of LEDs, a hollow light guide plate is provided immediately below the LEDs, a support for supporting the light guide plate is provided along a central axis of the light guide plate, and a light guide portion of the light guide plate is provided. A diffused layer having a diffuse reflection characteristic and a diffuse transmission characteristic is formed on the inner surface of the support, and a diffuse reflection layer is formed on the surface of the support, and the LEDs are arranged along the upper end face of the light guide.

In order to obtain a surface light source from an LED as a point light source, such a lighting apparatus has a light guide having a light guide portion in which a diffusion layer having a diffuse reflection characteristic and a diffuse transmission characteristic is formed on an inner surface. A light plate and a diffuse reflection layer arranged side by side with this light guide plate "are required, which not only complicates the structure but also reduces light in the transparent light guide plate. However, there is a disadvantage in that many LEDs are required to obtain sufficient illuminance, and gloves for covering these members are indispensable for outdoor use, and there are many problems in terms of illuminance maintenance and equipment cost.

On the other hand, the lighting fixture of Patent Document 2 (hereinafter referred to as a previously proposed lighting fixture) is a five-layer structure for a bullet-shaped hollow container-shaped LED that is coaxially and integrally mounted on a base that can be attached to and detached from a general-purpose socket. A plurality of LEDs are dispersedly mounted on and detachable from the holding unit, and are configured to be electrically connected to and disconnected from the base according to the insertion / removal operation. It is formed as a bullet-shaped light bulb as a whole, with a transparent cover of the shape removably attached.

The proposed lighting device having such a configuration can sufficiently achieve the intended purpose as a lighting device suitable for energy saving, but has a structure in which point light source type LEDs are dispersedly arranged on the outer periphery of the LED holding unit. From the point of view, it can be considered that each of the brightnesses is considerably large and may give a strong stimulus to the eyes of pedestrians. Generally, LEDs have strong directivity of light (narrow angle). Problems that need to be solved still remain, such as difficulty in spreading light emission, narrowing the irradiation range (area) per lighting fixture and increasing the number of lighting fixtures per unit area.
JP-A-11-213730 (pages 2-3 [0009] to [0014], FIGS. 1, 2, and 3) Japanese Patent Application No. 2002-007762 (Pages 5 to 7 [0008] to [0012], FIGS. 1 and 2)

  The present invention has been made in view of the above facts. Therefore, the purpose of the present invention is to make the form and design of the lamp so that the dispersion of light emission is promoted, and the number of LEDs The aim is to provide an optimal light source for white LED lighting that can be used for a white LED lighting device that can guarantee sufficient illuminance without increasing the amount of light, and can achieve energy saving and maintenance free comprehensively. is there.

  In order to achieve the above object, the present invention firstly relates to the invention of claim 1, wherein a plurality of required holding holes having a predetermined length pitch are formed on a plate surface having a shape corresponding to an illuminating surface of the lamp body 1 in the lighting device. While a plurality of white LEDs 11 are inserted and held in the respective holding holes and fixed at the immediately rearward portion of the LED chip associated with each electrode portion 12 with respect to the reflecting plate 9 provided in a matrix arrangement, By mounting the positive and negative terminals of each white LED 11 on the LED substrate 10 juxtaposed directly behind the reflector 9 and forming a series-parallel electric network suitable for the applied voltage for each positive and negative terminal, for white LED lighting It constitutes a light source.

  According to the present invention, for a plurality of white LEDs 11 provided in a matrix arrangement of a predetermined length pitch, a common reflector 9 is provided in the immediate rear part of the LED chip associated with each electrode part 12. Thus, the apparent increase in the number of the white LEDs 11 and the effective light reflection enable efficient forward light irradiation without any loss, so that the illuminance is sufficiently maintained while the number of the white LEDs 11 is minimized. Can be done. Therefore, it is a preferable white LED illumination light source to be implemented in a white LED illumination device such as a street light.

In order to achieve the above object, the present invention relates to the light source for white LED illumination according to the first aspect of the present invention, wherein a plurality of white LEDs 11 are associated with each electrode portion 12 with respect to the reflection plate 9. The LED chip is fixed at a position 2 to 4 mm behind the LED chip.

According to the present invention, the size of the reflector 9 is determined and fixed within an appropriate range so that the front surface of the reflector 9 is located at the rear portion having an interval of 2 to 4 mm. The light emitted from the LED chip can be efficiently reflected forward with minimal attenuation.

  As described above, according to the present invention, as the light source for white LED illumination, the increase in the apparent number of white LEDs by the reflector and the effective light reflection enable efficient forward light irradiation without loss. Therefore, it is possible to sufficiently maintain the illuminance while minimizing the number of white LEDs, and this is preferable for a white LED lighting device such as a street light.

  Further, since the present invention uses a white LED as the light source of the lighting device, it can guarantee a sufficient illuminance under a long service life and a low power load, can maintain a low running cost comprehensively, and can save energy and save energy. Maintenance free can be achieved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall view of a white LED lighting device according to an embodiment of the present invention, wherein (a) is a front view and (b) is a right side view. The illustrated white LED lighting device includes a lamp body 1, a lamp column 2, a power supply device 4, and a solar cell 5.
The lamp support 2 is, for example, an upright single pillar made of stainless steel including a lower end support portion 15 and a pole portion 21, and the support arm 1 is protruded from an intermediate portion or an upper end near the upper end shown in the drawing. Have The lamp support 2 is used, for example, as a street light support, and is erected in a posture in which a support arm 14 protrudes toward a pedestrian road near a roadside shoulder on a pedestrian road.

  The power supply device 4 is provided to supply power to a later-described white LED illumination light source 3 (hereinafter abbreviated as the light source 3) in the lamp body 1, and includes a storage battery such as a long-life control valve-type lead storage battery. It is used and housed in a predetermined space inside the lower end bearing 15 which is the lower part of the column 2. In addition, as the power supply device 4, in addition to the storage battery, an inverter (AC-DC converter) may be provided as needed for emergency use so that power is supplied from the low-voltage distribution line.

  The solar cell 5 is attached to the top of the lamp column 2 and is fixed in a direction and an inclination angle at which sunlight is most easily received. Depending on installation conditions, three types of crystals (polycrystal, single crystal, single crystal + amorphous) are used. An appropriate one is selected from the system solar cells. Although not shown, the electric power obtained from the solar cell 5 is configured to be stored in the storage battery 4 via a light source controller 6 described later. Note that the solar cell 5 is not necessarily required, and a lighting device in which only the lamp body 1 is attached to the lamp column 2 so as to receive power supply from an electric lamp / power distribution line is also included in the scope of the present invention. is there.

  The lamp main body 1 has a “pseudo T bold” in which the front and rear depth directions are longer than the left and right width directions by a lamp housing 7 and a colorless and transparent glove 8 attached to a bottom opening of the lamp housing 7. Are formed, the lamp housing 7 is made of stainless steel, and the globe 8 is made of acrylic resin. The lamp body 1 is supported by the lamp column 2 by fitting and fixing a mounting base 13 integrally projecting from a rear end of the lamp housing 7 to a support arm 14. At a position of 5 m, it is set in a posture in which the illuminating surface is directed downward and the longitudinal axis is extended slightly upward and forward.

  2, 3, and 4 show a side view, a bottom view, and a front view of the lamp body 1 in FIG. 1, respectively. FIG. 5 is a perspective view showing the lamp body 1 separated from an obliquely lower side, and FIG. 6 is a perspective view of the lamp body 1 also viewed from the rear side. 7 is a schematic longitudinal sectional view of the rear part of the lamp body 1 in the width direction, and FIG. 8 is a partially enlarged view of the light source 3 in FIG.

The configuration of the lamp body 1 in the white LED lighting device according to one embodiment of the present invention will be described below.
The lamp main body 1 includes a lamp housing 7, a globe 8, a light source 3, and a light source controller 6. The lamp housing 7 and the globe 8, which form the outer housing of the lamp body 1, have a cross section at a position facing the light source 3 housed in the housing. A rectangular shape having a short side parallel to the longitudinal side in the front-rear direction, and a front portion 7B, 8B integrally connected to the front portion 7B, 8A, which has a narrow and tapered narrow trapezoidal shape as compared with the rear portions 7A, 8A; At the time of assembling, the openings are aligned with the lamp housing 7 up and the globe 8 down, and the stainless steel glove frame 22 fitted to the peripheral edge of the globe 8 is attached to the peripheral edge of the lamp housing 7. The outer casing having a waterproof integrated structure is formed by a fixing means such as screw fastening or the like.

  5 and 7, the globe 8 has an illuminated surface portion having an inner surface which is a smooth surface 17 and an outer surface having vertical stripes in which mountain lines and valleys are alternately and repeatedly arranged at a pitch of several mm, for example, 5 mm. Is formed on a curved plate surface which is symmetrical in the left and right width directions with the center line on the longitudinal side as the bottom as a whole shape.

  On the other hand, the light source 3 includes a reflector 9, an LED substrate 10 (hereinafter, simply referred to as a substrate 10), and a plurality of required white LEDs 11 as element members, and a cross-sectional shape of an internal space of the outer housing. Is configured as a plate-shaped planar light source having a shape corresponding to. Referring to FIG. 5 and FIG. 7, the reflection plate 9 is a metal plate of aluminum or the like, and is a plate of a predetermined shape having a mirror-finished front reflection surface. The holes form a perforated plate with a predetermined pitch in a matrix arrangement. As an example, there is a perforated mirror plate in which holding holes are arranged and perforated in a matrix arrangement such as a staggered footprint or a grid pattern on the basis of a pitch of a size obtained by adding a gap of about 7 mm to the outer diameter of the white LED 11.

Next, the white LED 11 is fixed to the reflection plate 9 by inserting and holding a predetermined number of each LED forming a shell shape in each of the holding holes. In this case, as shown in FIG. proximate the rear portion relative to the associated LED is provided a chip (not shown), preferably, the rear portion having a distance d ₀ of 2-4 mm, the front surface of the reflection plate 9 Shi sized to position And fix it. The reason for this is that, in order to efficiently reflect light emitted from the electrode section 12 forward with the least attenuation, the position of the reflector 9 having the above dimensions is the optimum condition. Ri, study results based on actual measurement with respect to the optimum condition of this case, Ru revealed by the description below.

  The substrate 10 is a well-known wiring substrate, and has a predetermined arrangement corresponding to the positive terminal 23 and the negative terminal 24 made of fine conductive wires in the white LED 11 and has a predetermined number of pole holes formed therein. The positive terminal 23 and the negative terminal 24 of each white LED 11 are mounted on the substrate 10 by soldering 25 by utilizing the above-mentioned poles. Then, a series-parallel electric network suitable for the applied voltage is formed for each of the positive and negative terminals.

  In the light source 3 having the above-described configuration, the portion housed in the rear portion 7A having a rectangular shape with reference to FIG. The globe 8 is formed as a wide-open, half-square gutter-shaped bent plate having a shape corresponding to the rectangular curved plate surface of the rear portion 8A, while a portion accommodated in the elongated trapezoidal front portion 7B is a reflecting plate. 9 and the substrate 10 are formed in an elongated trapezoidal flat plate having a shape corresponding to the elongated trapezoidal curved plate surface of the front portion 8B of the globe 8. It is positioned and stored in the lamp housing 7 so that a distance d1 (see FIG. 7) of 20 mm is maintained.

  On the other hand, with respect to the light source controller 6, the controller 6 is a control system for controlling turning on / off of the light source 3, charging / discharging of the storage battery in the power supply device 4, connection / disconnection of the solar cell 5, and the like. A control command element such as a sunshine sensor, automatic voltage sensing means for sensing the output voltage of the solar cell 5, automatic power storage means for storing power obtained from the solar cell 5 by the means in the storage battery, and further comprising: A light source control means for turning on / off the light source 3 so that the light emission amount can be adjusted based on the control command of the light source 3 is provided. The light source 3 is housed in a space behind the light source 3 and electrically connected to the light source 3, the power supply device 4, and the solar cell 5.

As described above, the configuration of the main part of the white LED lighting device according to the embodiment has been described. In FIGS. 2 and 5, a member indicated by reference numeral 16 is a heat shield plate, and is attached to the lamp body 1 as necessary. It is. The heat shield plate 16 is a pressed plate made of metal such as aluminum having a shape similar to the out-of-plane shape of the lamp body 1, and is formed into a sunshade plate with a small gap right above the lamp housing 7. It is provided so as to be covered. By providing the heat shield plate 16 in this manner, direct sunlight to the lamp body 1 can be blocked, and a rise in temperature inside the body can be suppressed.

  On the other hand, it is also a preferable means to form the lamp support 2 by a hollow pipe. In this case, although not shown, an air release port is opened by ordinary means in a pipe wall from the upper end of the support, Since the hollow portion can exhibit the chimney effect, the heat generated by the outside air temperature provided in the lower portion can be exhausted from the air escape port to prevent the temperature from rising, thereby stabilizing the performance and extending the life of the storage battery.

  2 and 3, reference numerals 19 and 20 denote an intake port and an exhaust port, respectively. The intake port 19 is opened at the rear surface of a side plate of the rear portion 7A of the lamp housing 7, while the exhaust port 20 is Opened at the side of the side plate at the rear part 7A, the outside air sucked from the intake port 19 provided at a low level with respect to the exhaust port 20 is exhausted from the exhaust port 20 through the lamp housing 7 and is internally ventilated by natural ventilation. As a result of suppressing a rise in temperature, the performance of the light source controller 6 and the white LED 11 that is severe under temperature conditions can be stabilized.

Next, the operation of the device of the present invention having the above-described configuration will be described. The lamp body 1 is supported by a lamp column 2, for example, a position in which the illuminated surface is directed downward and the longitudinal axis is extended slightly upward at a position of 3 to 4m directly above the sidewalk, that is, for example, a horizontal line in FIG. Is set in a state of extending upward and forward at an inclination angle θ1 = 5 degrees with respect to. In the lighting device shown in FIG. 6, the light source 3 at the front portion 7B of the lamp housing 7 is provided so as to be inclined 5 degrees upward with respect to the longitudinal axis. It is in a state of extending upward and forward with an inclination angle θ2 = 5 degrees with respect to the horizontal line.

  In this installation state, the lamp main body 1 is turned on from sunset to sunrise by automatic control of the light source controller 6. In this case, by storing the electric power obtained from the solar cell 5 in the storage battery of the power supply device 4 via the light source controller 6, it is possible to cover all the necessary electric energy with solar energy. This lighting device using the high-brightness white LED 11 as a light source requires approximately one-third of the power while maintaining the same brightness as a conventional fluorescent lamp, and burns out for a long time (about 13 years). In addition, since the wavelength of light is close to that of sunlight, insects fly very little, and furthermore, it is possible to use while maintaining the illuminance even in a cold region where the fluorescent lamp is not turned on.

  It should be noted that there is an advantage that the irradiation range of the lamp body 1 is significantly widened. In other words, the design is suitable for a lamp having a “pseudo-T bold” shape, and as shown schematically in FIG. The light transmitted through the globe 8 is diffused toward a wide range based on the synergistic effect exerted by the function, and as a result, the effective irradiation range on the ground is such that the width direction is the depth direction from the position immediately below the lighting device as a base point. In this case, a substantially elliptical area which is substantially twice as long as that of the first embodiment is obtained, so that the illumination range is wide and an ideal illuminance distribution as a street light can be obtained. Another feature of the lamp body 1 is that the entire illuminated surface of the globe 8 shines with a so-called eye-friendly uniform brightness.

  FIG. 9 shows a form of an illuminance distribution to be actually measured on a road surface when the white LED lighting device according to the embodiment of the present invention is turned on. At the time of the actual measurement, the lamp main body 1 was installed with the illuminated surface facing downward at a height of 3450 m directly above the sidewalk and the longitudinal axis extended forward and upward at an inclination angle θ1 = 10 degrees with respect to the horizontal line. . As the lamp main body 1, a white LED (product number: NSPW500BS, luminous intensity: 9.20 cd / sphere) arranged in an arrangement of 120 staggered footprints (power consumption: ≒ 10 W) was used.

According to FIG. 9, at a position directly below the lamp body 1, an illuminance of 42.6 lx is obtained, and as the distance increases, the light intensity attenuates to 35.0 lx, 20.0 lx, and 5.0 lx, and the longitudinal direction of the lamp body 1 ( In the width direction on the road), 1.5 lx is secured at a separation position of 2.3 m (roadway side) and 3.3 m (anti-roadway side), and in the width direction of the lamp body 1 (front-back direction on the road), 1.5 lx was secured at the front and rear 5.3 m (roadway side) separated position. On the other hand, a comparative experiment was performed under the same conditions except that the globe 8 of the lamp body 1 was a curved plate surface having no uneven surface and both inner and outer surfaces were made smooth. In the width direction (the front-rear direction on the road), 1.5 lx was confirmed at a distance of 3.0 m (roadway side) from both front and rear.
As is clear from the comparison between the two, the difference in the effective irradiation range in the width direction of the lamp body 1 becomes more apparent, and the advantage of the illumination device using the illumination light source according to the present invention becomes more obvious. Is proved here.

By the way, the distance d with respect to the LED chip related to the electrode 12 ₀ In order to obtain the above-mentioned optimal conditions, the inventor repeatedly conducted various experiments and studies on the provision of the reflector 9 in the immediate rearward portion having (see FIG. 8). ₀ When the change of the light emission illuminance of the LED 11 was actually measured when the value was changed, the following results were obtained. A bullet-shaped white LED (product number: NSPW515BS) having a body diameter of 5 mmφ is used as the LED 11, while an aluminum plate body whose front reflection surface is mirror-finished is used as the reflection plate 9, and is directly in front of the LED 11. The emission illuminance of the LED 11 was actually measured by an illuminometer disposed at a position 300 mm apart.

The result of the above measurement is d ₀ = 124 lux for 2 mm, d ₀ = 116 lux for 3 mm, d ₀ = 4 mm, 110 lux in the case without the reflector 9, and 107 lux in the case without the reflection plate 9. ₀ Fixing the reflector 9 so that the front surface is positioned within the range of the immediate rearward portion having the above-mentioned shape is optimal for efficiently reflecting the light emitted from the electrode portion 12 forward with minimal attenuation. It clearly states that it is a condition.

1 is an overall view of a white LED lighting device according to an embodiment of the present invention, wherein (a) is a front view and (b) is a right side view. The side view of the lamp main body 1 in FIG. The bottom view of the lamp main body 1 in FIG. The front view of the lamp main body 1 in FIG. FIG. 2 is a perspective view of the lamp main body 1 in FIG. 1 separated from obliquely below. FIG. 2 is a perspective view from the rear side of the lamp body 1 in FIG. 1. FIG. 2 is a schematic longitudinal sectional view of a rear part of the lamp body 1 in FIG. 1 in a width direction. FIG. 8 is a partially enlarged view of the white LED illumination light source 3 in FIG. 7. FIG. 4 is an illuminance distribution diagram that is actually measured when the white LED lighting device according to the embodiment of the present invention is turned on.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 ... Lamp main body 2 ... Lamp support 3 ... Light source for white LED illumination 4 ... Power supply device 5 ... Solar cell 6 ... Light source controller 7 ... Lamp housing 7A ... Rear of lamp housing 7B ... Front of lamp housing 8 ... Globe 8A: Rear part of glove 8B: Front part of glove 9 ... Reflector 10 ... LED substrate 11 ... White LED 12 ... Electrode part 13 ... Mounting base 14 ... Support arm 15 ... Lower end support part 16 ... Heat shield plate 17 ... Smooth surface 18 ... concave-convex surface 19 ... intake port 20 ... exhaust port d 0 _... interval

Claims (2)

A plurality of required holding holes are provided in a plate surface having a shape corresponding to the illuminating surface of the lamp body (1) of the lighting device in a matrix arrangement with a predetermined pitch. The white LEDs (11) are inserted and held in the respective holding holes and fixed at the immediate rear portion of the LED chip associated with each electrode portion (12), while being arranged side by side immediately after the reflector (9). For white LED lighting, the positive and negative terminals of each white LED (11) are mounted on the LED substrate (10), and a series-parallel electric network suitable for the applied voltage is formed for each positive and negative terminal. light source. The light source for white LED illumination according to claim 1, wherein the plurality of white LEDs (11) are fixed to the reflector (9) at a position 2 to 4 mm behind the LED chip associated with each electrode portion (12).

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