WO2008047444A1

WO2008047444A1 - Lighting apparatus

Info

Publication number: WO2008047444A1
Application number: PCT/JP2006/320914
Authority: WO
Inventors: Masumi Nasuno
Original assignee: Epsel Co., Ltd.
Priority date: 2006-10-20
Filing date: 2006-10-20
Publication date: 2008-04-24
Also published as: JPWO2008047444A1

Abstract

[PROBLEMS] To provide stable light for a long time by using a plurality of light emitting diode elements. [MEANS FOR SOLVING PROBLEMS] A light emitting diode lighting apparatus (1) is provided with a light emitting diode row (18) wherein a plurality of light emitting diode elements (16) are connected in series, and a constant current control element (20) connected in series to the light emitting diode row (18).

Description

Specification

Light emitting diode lighting device

Technical field

The present invention relates to an illumination device that uses a plurality of light emitting diode elements.

Background art

In recent years, lighting devices using light-emitting diode elements have become widespread. Generally, since a rated voltage exists in a light emitting diode element, it is generally practiced to adjust the voltage applied to the light emitting diode element by connecting a resistor in series with the light emitting diode element. It has been broken. It is also possible to control the voltage by detecting the current supplied to the light emitting diode element and feeding it back to the supply voltage side.

Patent Document 1: Japanese Patent Laid-Open No. 2003-152224

Disclosure of the invention

Problems to be solved by the invention

[0003] The method of controlling the supply voltage while detecting the current while detecting the current requires a separate circuit for current detection, which complicates the entire circuit and reduces efficiency. .

[0004] Although not known at the time of the present application, according to the study of the present inventor, when many light emitting diode elements are connected in series or in parallel, there is a problem that they generate heat and become high temperature. there were. Furthermore, the characteristics of each light-emitting diode element fluctuate individually over time due to inherent variations among multiple light-emitting diode elements, the placement position, the influence of heat generation, and so on. There was a problem that the variation could not be absorbed! /.

The present invention has been made in view of the above problems, and even when a large number of light emitting diode elements are simultaneously turned on, a light emitting diode illumination device that achieves low power consumption and has a long life. The purpose is to provide.

Means for solving the problem

[0006] The present invention for achieving the above object is a light emitting device in which a plurality of light emitting diode elements are connected in series. A light-emitting diode illuminating device comprising: a diode array; and a constant current control element connected in series to the light-emitting diode array.

[0007] The light-emitting diode illuminating device according to the invention is characterized in that a constant current diode element is connected as the constant current control element.

[0008] Further, the light-emitting diode illuminating device according to the invention is characterized in that a plurality of illumination modules configured to include the constant current control element and the light-emitting diode array are connected in parallel.

[0009] Furthermore, the light-emitting diode illuminating device according to the invention is characterized in that a constant-current diode array in which a plurality of the constant-current diode elements are connected in parallel is connected in series to the light-emitting diode array.

[0010] Furthermore, the light-emitting diode illuminating device according to the invention is characterized in that a distance between a plurality of adjacent light-emitting diode elements is within 2 centimeters.

[0011] The light-emitting diode illuminating device according to the invention is characterized in that a distance force between a plurality of the light-emitting diode elements adjacent to each other is approximately 丄 cm.

[0012] The light-emitting diode illuminating device according to the invention further includes a substrate on which the light-emitting diode element is mounted, and a metal housing that covers the substrate with the light-emitting surface side of the light-emitting diode element being opened. And an uneven surface is formed on the outer surface of the housing.

[0013] The light-emitting diode illuminating device according to the invention further includes a light-transmitting front cover that covers the light-emitting surface side, and an annular light reflecting surface is formed in a stepped shape on the inner surface side of the front cover. It is characterized in that it is formed in plural.

[0014] Further, the light-emitting diode illuminating device according to the invention is characterized by further comprising a thermally conductive insulating sheet disposed on the back surface and near the center of the substrate.

[0015] Furthermore, the light-emitting diode illuminating device according to the present invention has a heat-dissipating protrusion formed so as to protrude from the inner periphery of the casing and to directly or indirectly contact the substrate to derive heat from the substrate. It is characterized by that.

[0016] Furthermore, the light-emitting diode illuminating device according to the invention is characterized by comprising an umbrella-shaped light reflecting cover that covers the periphery of each of the light-emitting diode elements. [0017] The light-emitting diode illuminating device according to the invention is characterized by comprising constant voltage control means for controlling a constant voltage applied to the constant current control element and the entire light-emitting diode array.

[0018] Further, the light-emitting diode illuminating device according to the invention is characterized in that the constant voltage control means maintains the applied voltage at about 48V.

[0019] Further, the light-emitting diode illuminating device according to the invention is characterized in that a supply-side voltage supplied to the constant voltage control means is AC100V or more and AC240V or less.

[0020] Furthermore, the light-emitting diode illuminating device according to the invention is characterized by comprising solar power generation means for generating electricity to be applied to the constant current control element and the light-emitting diode array.

[0021] Further, the light-emitting diode illuminating device according to the invention is characterized by comprising voltage adjusting means for variably controlling the voltage supplied to the constant current control element and the light-emitting diode array.

[0022] The light-emitting diode illuminating device according to the invention is characterized in that ten or more light-emitting diode elements in the light-emitting diode array are connected in series.

[0023] Further, the light-emitting diode illuminating device according to the invention is characterized in that 30 or more light-emitting diode elements in the light-emitting diode array are connected in series.

[0024] Furthermore, the light-emitting diode illuminating device according to the invention is characterized in that the power consumption of the constant current control element is set to 40 mW or more and 70 mW or less.

[0025] Further, the light-emitting diode illuminating device according to the invention is characterized in that each power consumption of the light-emitting diode element is set to 55 mW or more and 60 mW or less.

[0026] Further, the light-emitting diode illuminating device according to the invention is characterized by comprising voltage variable adjusting means for variably controlling the voltage supplied to the constant current control element and the light-emitting diode array.

The invention's effect

[0027] According to the present invention, if a plurality of light emitting diodes can emit light in a stable and long-life state, an excellent effect can be achieved.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a circuit configuration of the light-emitting diode illuminating device 1 according to the first embodiment of the present invention.

[0030] The light-emitting diode illuminating device 1 includes ten illumination modules 10 connected in parallel to each other, a DCZDC converter 12 that applies a constant voltage to the illumination modules 10, and supplies electricity to the DCZDC converter 12. Equipped with a 24V DC power supply terminal 14. This DC power supply terminal 14 is connected to a DC power supply, not shown.

The illumination module 10 includes a light emitting diode array 18 in which 30 light emitting diode elements 16 are connected in series, and a constant current control element 20 further connected in series to the light emitting diode array 18. Here, as the constant current control element 20, a constant current diode array in which two constant current diodes 22 are connected in parallel is used.

[0032] The DCZDC converter 12 is a so-called switching power supply, and includes an input terminal 12A and an output terminal 12B. Therefore, even if the 24V voltage on the input side fluctuates somewhat, the output side voltage is controlled at a constant voltage and boosted so that it is always 48V.

FIG. 2 shows an actual arrangement state of the light-emitting diode elements 16 in the light-emitting diode illuminating device 1. In the light emitting diode illumination device 1, 300 light emitting diode elements 16 are arranged in an array of 15 × 20 rows with respect to the circuit board 30. The distance L between adjacent light emitting diode elements 16 is set to approximately 1 centimeter. Since each lighting module 10 includes 30 light emitting diode elements 16, one lighting module 10 corresponds to two rows on the substrate.

FIG. 3 shows the overall structure of the light-emitting diode illuminating device 1.

The light-emitting diode illuminating device 1 includes a circuit board 60, a housing 70, and a front cover 80. The circuit board 60 has a plurality of light emitting diode elements 16 mounted in the same arrangement as in FIG. 2, but the outer shape of the board is circular. The light emitting surface 60A is formed by these light emitting diode elements 16.

As shown in FIG. 4, the housing 70 is made of a metal material having high thermal conductivity, specifically, an aluminum material, and has a so-called bowl shape having a bottom portion 71 and an opening 79. Become. Therefore, the housing 70 is in a state where the light emitting surface 60A side of the circuit board 60 is opened. The back and side surfaces of the circuit board 60 are mainly covered. A plurality of fins 72 are radially formed on the outer peripheral surface of the housing 70, and the heat dissipation effect is enhanced by increasing the contact area with the outside air by the unevenness formed by the fins 72. . Here, a case is shown in which a plurality of heat radiation irregularities are formed by a plurality of radial fins 72. For example, by providing a plurality of circumferentially extending fins, grooves, steps, etc. in the radial direction, heat radiation can be achieved. A plurality of irregularities may be formed.

[0037] Returning to Fig. 3, a thread 73 is formed on the bottom 71 of the casing 70 by covering the outer periphery with a highly insulating nylon resin. An end cap 74 for supplying power is attached to the thread 73. This end cap 74 corresponds to the DC power supply terminal 14 shown in the circuit configuration of FIG. 1, and in this embodiment, an end cap 74 that can be attached to an E26 standard socket used for an incandescent bulb or the like is used. . This makes it possible to use the light-emitting diode illuminating device 1 as an alternative to incandescent bulbs even in ordinary households. On the other hand, when used in place of incandescent lamps, mercury lamps, metal halide lamps, etc., end caps that can be attached to E39 standard sockets may be used. Since the end cap 74 and the housing 70 are insulated by the screw thread 73, no current flows through the housing 70.

[0038] On the inner periphery of the housing 70, three arms 75 for holding the circuit board 60 are formed in the circumferential direction. A female screw hole is formed at the tip of the arm 75, and the circuit board 60 is screwed to the tip. Further, a heat radiating protrusion 76 is formed on the inner periphery of the casing 70 so that the protrusion 76 contacts the circuit board 60 directly or indirectly, so that the heat of the circuit board 60 is transferred to the casing 70. Absorb to the 70 side. Although not specifically shown, when the heat dissipation protrusion 76 is in direct contact with the circuit board 60, it is necessary to contact the insulating region of the circuit board 60.

Returning to FIG. 3, on the back side of the circuit board 60, that is, on the side opposite to the light emitting surface 60A, the thermally conductive insulating sheet 62 is disposed so as to include at least the vicinity of the center of the circuit board 60. Specifically, the thermally conductive insulating sheet 62 is a silicon material containing a metal powder that enhances thermal conductivity at a level that can maintain insulation, and can easily be deformed in shape. Therefore, even if the back surface of the circuit board 60 is uneven, it is possible to make the heat conductive insulating sheet 62 adhere to the circuit board 60. The thermally conductive insulating sheet 62 is in close contact with the arm 75 or the heat dissipation protrusion 76 of the housing 70. That is, the arm 75 and the heat radiating protrusion 76 are in contact with the circuit board 60 indirectly. As a result, the heat in the vicinity of the center of the circuit board 60 is indirectly released to the housing 70 side through the heat conductive insulating sheet 62.

[0041] The front cover 80 is made of a light-transmitting grease and is fixed to the opening 79 of the housing 70. As a result, the light emitting surface 60A side of the circuit board 60 is covered by the front cover 80. As shown in FIG. 5, on the inner surface of the front cover 80, a plurality of annular light reflecting surfaces 82 are formed stepwise. When the light is irregularly reflected on the light reflecting surface 82, the entire front cover 80 is illuminated. Although not particularly shown, DCZDC converter 12 shown in the circuit configuration of FIG.

Next, the operation of the light-emitting diode illuminating device 1 will be described.

FIG. 6 shows individual characteristic curves of the constant current diode 22. It can be seen that the constant current diode 22 has a function of keeping the current as constant as possible even when the voltage fluctuates. As a result, in each lighting module 10, even if the impedance of the light emitting diode element 16 changes due to heat generation of the light emitting diode element 16 or fluctuation of the external temperature environment, each lighting module 10 Inside, the constant current diode 22 side absorbs the impedance variation, and the current flowing through the light emitting diode element 16 is kept as constant as possible.

FIG. 7 shows the relationship between the applied voltage, current, and the like of the light-emitting diode array 18 and the constant current diode 22 for each lighting module 10 in a state where the light-emitting diode illuminating device 1 actually emits light. . Here, the column number is a management number assigned to the lighting modules 10 connected in parallel, and numbers 1 to 10 are assigned from one end to the other end. In this way, when a plurality of lighting modules 10 are connected in parallel to emit light, the impedance of the light-emitting diode array 18 of the lighting modules 10 in the 4th to 7th positions on the center side decreases, and this light emitting diode The voltage applied to row 18 will drop. On the other hand, in order to compensate for this, the impedance of the constant current diode 22 rises, increasing its applied voltage.

Note that the voltage drop of the lighting modules 10 connected in parallel in this way becomes irregular between the lighting modules 10. The thermal power generated from each lighting module 10 is naturally a substrate. This is thought to be caused by the temperature rising locally in the center of 30. In addition, the central portion of the substrate 30 has a lower heat dissipation capability than the peripheral portion.

In the present embodiment, the constant current diode 22 and the light emitting diode element 16 can be combined to maintain the current constant. Therefore, the power consumption power of the constant current control element 20 in the lighting modules 10 connected in parallel is 40 mW. The power consumption of each light emitting diode element 16 is set within the fluctuation range of 55 mW or more and 60 mW or less. Therefore, even when the heat change and the external environment change are large, the power consumption can be stabilized, and the life of the lighting module 10 is extended accordingly.

Furthermore, in the light emitting diode illuminating device 1, the heat generated from the light emitting diode array 18 is efficiently released by the unevenness of the outer surface of the housing 70. In particular, the heat conductive insulating sheet 62 is disposed in the center of the back surface of the circuit board 60, and the heat concentrated in the center of the circuit board 60 is actively released. Thereby, since the impedance change of the light emitting diode element 16 is reduced, the burden on the constant current diode 22 is reduced.

Furthermore, even when a large amount of light-emitting diode elements 16 emit light as in the present embodiment, the constant current diodes 22 are connected to the respective light-emitting diode arrays 18 so that the individual light-emitting diode elements 16 can be individually identified. It is possible to respond individually and flexibly to changes in the characteristics of the light-emitting diode array 18 that are arranged in a place that is likely to be physically hot. Therefore, even if the thermal environment of each lighting module 10 changes over time due to long-time light emission or light emission in summer, the light-emitting diode element 16 due to thermal runaway due to the presence of the constant current diode 22 Thus, it is possible to emit uniform and stable light in all the lighting modules 10. In particular, the light reflecting surface 82 is formed on the front cover 80, so that the illumination light emitted from the front cover 80 can be made more uniform.

[0049] In the light-emitting diode illuminating device 1, since the current is individually made constant using the constant current diode 22, the circuit structure is simplified, and the overall power consumption can be reduced. In this embodiment, each lighting module 10 includes two constant current diodes. Since 22 are connected in parallel, the current borne by each constant current diode 22 can be halved. Furthermore, the load of the constant current diode 22 can be further reduced by the structure of the housing 70 and the heat dissipation effect by the heat conductive insulating sheet 62. As a result, the permissible capacity of the constant current control element 20 with respect to a large characteristic change (specifically, impedance change) of the light emitting diode array 18 can be increased. Further, the power constant current diode 22 already shown in FIG. 6 can be actively used on the low voltage region side, and the power consumption of each constant current diode 22 can be reduced under normal conditions. As a result, it is possible to reduce the heat generation that adversely affects the light emitting diode array 18 while extending the life of the constant current diode 22.

[0050] Since the durability against heat generation is enhanced in this way, the arrangement interval of the light emitting diode elements 16 can be set to 1 cm, and it is possible to emit powerful light while being compact. . In particular, when the light-emitting diode illuminating device 1 is used as a projector, it is desirable to set the arrangement interval of the light-emitting diode elements 16 within 2 centimeters.

Next, the circuit configuration of the light-emitting diode illuminating device 100 according to the second embodiment of the present invention will be described with reference to FIG. In this light-emitting diode illuminating device 100, the same or similar parts as those in the light-emitting diode illuminating device 1 of the first embodiment are not described in detail by matching the last two digits of the symbols. Since the casing and the front cover other than the circuit configuration are the same as those in the first embodiment, a description thereof is omitted here.

[0052] The light-emitting diode illuminating device 100 includes ten illumination modules 110 connected in parallel to each other, and power terminals 14 1 and 142 capable of connecting the illumination module 110 to an external power source 114. Yes. The illumination module 110 includes ten light emitting diode elements 116 connected in series and a constant current diode 122 connected in series. Between the lighting module 110 and the power supply 114, a voltage step-up / step-down circuit, a voltage detection circuit, a smoothing circuit, and the like are provided. The power source 114 is an accumulation of electricity generated by a solar power generation panel (not shown).

[0053] The step-up / down circuit has terminals 141 and 142 connected to a power source 114 such as a battery and an illumination module. The voltage applied to the lighting module 110 is raised and lowered. Specifically, an inductance element 135 such as a coil is disposed between the power source 141 and the lighting module 110 as a step-up / step-down circuit, and the voltage is raised or lowered by a change in current flowing through the inductance element 135. As a result, disposing an impedance element such as a resistance element between the AC power supply 114 and the lighting module 110 is avoided, and power consumption is reduced.

[0054] One end of a switching element 134 such as a transistor is connected to one end of an inductance element 135, and a control side terminal serving as a base and a gate in the switching element 134 is connected to a voltage detection circuit 131 such as a DCZDC converter control circuit. Connected to output terminal (EXT 4). This output terminal outputs a pulse signal with a variable pulse width, makes the switching time of the switching element 134 variable, and changes the current flowing through the inductance element 135.

[0055] Between the control terminal of the switching element 134 and the output terminal (EXT4) of the voltage detection circuit 131, a parallel circuit of a resistance element 132 and a capacitor 133 is arranged to remove noise of harmonic components. Waveform shaping. The step-up / down circuit is composed of, for example, an inductance element 135, a switching element 134, and a switching signal output from a DCZDC converter control circuit.

The voltage detection circuit 131 detects a voltage applied to the illumination module 110. Specifically, a DCZDC converter control circuit is used as the voltage detection circuit 131, and a voltage obtained by dividing a voltage applied between the lighting modules 110, that is, a voltage proportional to a voltage applied between both ends of the lighting module 110 is used. Is detected. As a circuit, a series of resistance elements 161, 163, and 164 connected in series is connected in parallel between both ends of the illumination module 110, and a divided voltage in the middle is measured. One of the resistance elements 164 is a variable resistance element so that the detection voltage can be changed. A capacitor 162 is connected in parallel to the resistor element 161. The detection voltage is input to the input terminal (Vout3) of the voltage detection circuit 131. When the detection voltage increases, the voltage detection circuit 131 outputs a pulse signal with a small pulse width to the output terminal (EXT4) of the voltage detection circuit 131, and when the detection voltage decreases, the output terminal (EXT4) of the voltage detection circuit 131. A pulse signal with a large pulse width is output. [0057] In this way, fluctuations in the voltage applied between the lighting modules 110 change the pulse width output to the output terminal (EXT4) of the voltage detection circuit 131, thereby changing the switching time of the switching element 134. Therefore, since the current flowing through the inductance element 135 is changed, the voltage applied between the lighting module 110 and the lighting module 110 can be kept constant. Further, the voltage applied between the terminals of the illumination module 110 can be variably adjusted by changing the resistance value of the variable resistance element 164.

As a result, for example, when the impedance variation of the entire lighting module 110 occurs according to the thermal variation, it is possible to adjust the applied voltage, reducing the voltage adjustment burden of the constant current diode 122 and reducing the consumption. Electric power can be reduced.

The voltage detection circuit 131 has a positive voltage terminal (VDD2) connected to the voltage regulator 105 and a negative voltage terminal (Vss5) connected to the power supply terminal 42 (ground). A power supply terminal 141 is connected to the input terminal (VIN2) of the voltage regulator 105. As a result, for example, 12V voltage is converted to 5V and output.

[0060] The smoothing circuit smoothes voltage fluctuations caused by changes in the current flowing through the inductance element 135. Smoothing circuit, power various circuit is known for example, terminals of I inductance element 135 and the diode (smoothing diodes) ₁₂ 5 placed in the circuit between the lighting modules 110, arranged between the terminals of the lighting module 110 The smoothing capacitor 121 can be configured.

[0061] According to the light-emitting diode illuminating device 100, the constant-current diode 122 in each lighting module 110 attempts to maintain a constant current, thereby absorbing the temporal characteristic change of the light-emitting diode 116. Is possible. Furthermore, as already shown in FIG. 6 and the like, if the constant current diode 122 tries to keep the current constant, a force that may cause a slight current change according to the curve of the current Z voltage characteristic. By variably adjusting the voltage applied to 110 by a step-up / down circuit, it becomes possible to perform detailed control in response to changes in the overall characteristics of the illumination module 110. In particular, the constant current diode 122 absorbs fluctuations in current due to the use of an AC power supply, and flickering of the light emitting diode 116 can be prevented.

Next, referring to FIG. 9, a light-emitting diode illuminating apparatus 200 according to the third embodiment of the invention The structure will be described. In the light-emitting diode illuminating device 200, the same or similar parts as those in the light-emitting diode illuminating device 1 of the first embodiment are not described in detail by matching the last two digits of the reference numerals. Further, since the circuit configuration is the same as that of the light-emitting diode illuminating device 1 of the first embodiment, description thereof is omitted here.

[0063] The light-emitting diode element 216 installed on the circuit board 260 of the light-emitting diode illuminating device 200 is a surface-mounted type instead of a shell type. A light reflection module 290 is disposed between the circuit board 260 and the front cover 280. The light reflection module 290 includes a plurality of umbrella-shaped light reflection covers 292 corresponding to the light emitting diode elements 216, respectively. The light reflection cover 292 is a cylindrical member having a partially conical shape, and the light emitting diode element 216 is disposed inside the cylinder. The inner periphery of the light reflecting cover 292 is mirror-finished, and this inner periphery becomes the light reflecting surface. That is, the periphery of the light emitting diode element 219 is surrounded by the light reflecting surface of the light reflecting cover 292. As a result, the light from the light emitting diode element 219 is reflected by the light reflecting cover 292, and the light reflecting cover 292 shines as a whole, and bright light can be obtained. By adopting this light reflecting cover 292, the efficiency of illumination is improved, so the number of light emitting diode elements 219 can be reduced, and the amount of heat generation can be reduced. When the light reflection module 290 is used, the front cover can be omitted.

[0064] In the present embodiment, the force invention described only when a DC power source is used as the power source is not limited thereto. For example, it is possible to use a power supply of AC 100V or more and 240V or less. In this case, while converting AC to DC, the ripples at that time are smoothed by a smoothing circuit and supplied to the lighting module. Is preferred. In the present embodiment, the light emitting diode elements are shown only when they are arranged in a square region, but the present invention is not limited thereto. For example, the light emitting diode elements 316 may be arranged in a circular area 360A of the substrate 360 as shown in FIG. It is also possible to arrange a plurality of light emitting diode elements in a spherical region or the like.

[0065] The light-emitting diode illuminating device of the present embodiment can be used, for example, in a place where an existing incandescent lamp, mercury lamp, metal halide lamp, or the like is used. In particular, it can be applied to ceiling downlights, etc., because it is small and has high brightness. Noh. The light-emitting diode illuminating device of the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the scope of the present invention.

Industrial applicability

[0066] The light-emitting diode illuminating device of the present invention can be used for various applications such as a projector and a streetlight.

Brief Description of Drawings

FIG. 1 is a circuit diagram showing a circuit configuration of a light-emitting diode illuminating device according to a first embodiment of the present invention.

FIG. 2 is a front view showing a substrate arrangement of light emitting diode elements in the light emitting diode illumination device.

FIG. 3 is a front view showing the overall configuration of the light-emitting diode illuminating device and a cross-sectional view taken along the line B-B.

[Fig. 4] Perspective view of housing of light-emitting diode illuminator and enlarged view of part B

FIG. 5 is a perspective view and a partially enlarged sectional view of a front cover of the light emitting diode lighting device.

[Figure 6] Diagram showing the characteristic curve of the constant current diode used in the LED lighting device

[Fig. 7] Schematic diagram showing fluctuations in characteristics of each lighting module during use of the light-emitting diode illuminator.

FIG. 8 is a circuit diagram showing a circuit configuration of a light-emitting diode illuminating device according to a second embodiment of the present invention.

FIG. 9 is a cross-sectional view showing the overall configuration of a light-emitting diode illuminating device according to a third embodiment of the present invention.

FIG. 10 is a diagram showing an arrangement of light emitting diode elements of a light emitting diode illumination device according to another embodiment of the present invention.

Explanation of symbols

[0068] 1, 100, 200 Light-emitting diode illuminator

10, 110 lighting module

12 DCZDC 116, 216 Light emitting diode element Light emitting diode array Constant current control element 122 Constant current diode 260 Circuit board 270 Case

280 Front cano

Claims

The scope of the claims

[1] a light-emitting diode array in which a plurality of light-emitting diode elements are connected in series;

And a constant current control element connected in series to the light emitting diode array.

[2] A constant current diode element is connected as the constant current control element! The light-emitting diode illuminating device according to claim 1, characterized in that the light-emitting diode illuminates.

[3] The light-emitting diode illumination device according to claim 1 or 2, wherein a plurality of illumination module forces configured to include the constant current control element and the light-emitting diode array are connected in parallel.

4. The light-emitting diode illuminating device according to claim 1, wherein a constant-current diode array in which a plurality of the constant-current diode elements are connected in parallel is connected in series to the light-emitting diode array. .

[5] The light-emitting diode illuminating device according to any one of claims 1 to 4, wherein a distance between a plurality of adjacent light-emitting diode elements is within 2 centimeters.

6. The light-emitting diode illuminating device according to claim 5, wherein the distance between the plurality of adjacent light-emitting diode elements is approximately 1 centimeter.

[7] a substrate on which the light emitting diode element is mounted;

A metal housing that covers the substrate in a state where the light emitting surface side of the light emitting diode element is open,

7. The light-emitting diode illuminating device according to claim 1, wherein irregularities are formed on an outer surface of the casing.

[8] Further, a front cover having light transmittance covering the light emitting surface side is provided,

8. The light-emitting diode illuminating device according to claim 7, wherein a plurality of annular light reflecting surfaces are formed in a step shape on the inner surface side of the front cover.

[9] The light-emitting diode illuminating device according to [7] or [8], further comprising a thermally conductive insulating sheet disposed on the back surface and near the center of the substrate.

[10] The range according to claim 7, 8, or 9, characterized in that it has a heat-dissipating protrusion that protrudes from the inner periphery of the housing and that directly or indirectly contacts the substrate to derive heat from the substrate. Departure Photodiode lighting device.

11. The light-emitting diode illuminating device according to any one of claims 1 to 10, further comprising an umbrella-shaped light reflecting cover that covers the periphery of each of the light-emitting diode elements.

12. The light-emitting diode illuminating device according to any one of claims 1 to 11, further comprising constant voltage control means for controlling a constant voltage applied to the entire constant current control element and the light-emitting diode array.

13. The light-emitting diode illuminating device according to claim 12, wherein the constant voltage control means maintains the applied voltage at about 48V.

14. The light-emitting diode illuminating device according to claim 12, wherein a supply-side voltage supplied to the constant voltage control means is AC100V or more and AC240V or less.

15. The light emitting diode illumination device according to any one of claims 1 to 14, further comprising solar power generation means for generating electricity to be applied to the constant current control element and the light emitting diode array.

16. The light-emitting diode illuminating device according to any one of claims 1 to 15, further comprising voltage adjusting means for variably controlling a voltage supplied to the constant current control element and the light-emitting diode array.

17. The light-emitting diode illuminating device according to any one of claims 1 to 16, wherein 10 or more light-emitting diode elements in the light-emitting diode array are connected in series.

18. The light-emitting diode illuminating device according to claim 17, wherein 30 or more of the light-emitting diode elements in the light-emitting diode array are connected in series.

[19] The light-emitting diode illuminating device according to any one of [1] to [18], wherein power consumption of the constant current control element is set to 40 mW or more and 70 mW or less.

20. The light-emitting diode illuminating device according to any one of claims 1 to 19, wherein each power consumption of the light-emitting diode element is set to 55 mW or more and 60 mW or less.

[21] A voltage supplied to the constant current control element and the light emitting diode array is variably controlled. The light-emitting diode illuminating device according to any one of claims 1 to 20, further comprising voltage variable adjusting means.