JP2010272463A - LED lighting device - Google Patents

Abstract

To provide an LED lighting device capable of reducing the thickness in the depth direction by eliminating a reflector.
In an LED illumination device comprising: a light source section in which a plurality of LEDs 8 are arranged; and a plurality of optical lenses 11A arranged adjacent to each LED 8 of the light source section. A refraction control unit 11a that controls light from the LED 8 by refraction and a reflection control unit 11b that controls light from each LED 8 by reflection are provided. Further, the reflection control unit 11b is arranged around the refraction control unit 11a so as to surround it. Here, it is assumed that the reflection control unit 11b uses total reflection at the air interface with the optical lens 11A. For example, the reflection control unit 11b is configured with incident surfaces c and e and reflecting surfaces d and f having a sawtooth cross section.
[Selection] Figure 10

Description

  The present invention relates to an LED illumination device including an LED as a light source and an optical lens for controlling the light distribution.

  Conventionally, as an illumination device such as an outdoor illumination lamp, a combination of a light source such as a high-intensity mercury lamp or a halogen lamp and a reflector (reflecting mirror) has been used (for example, see Patent Document 1).

  On the other hand, in recent years, the replacement of LED lamps having a long-life and low power consumption LED as a light source has been advanced from those using a large light quantity lamp such as a mercury lamp or a halogen lamp as a light source. Also in the lighting device, a configuration in which an LED and a reflector are used in combination is employed. For example, in Patent Document 2, an arbitrary illumination pattern is formed at an arbitrary distance from light emitted from an LED by combining a reflector (reflecting mirror), an aspheric lens, and a lens cover having predetermined optical characteristics. There has been proposed an LED illumination device capable of performing the following.

JP 2004-342570 A JP 2006-286615 A

  By the way, when using an LED as a light source, for example, in a backlight of a liquid crystal display, a very thin illumination device is realized by a combination of an LED and a scattering plate (that is, without using a reflector) Such an illuminating device cannot be applied to an illuminating device used outdoors that requires a large amount of light, because the amount of light is insufficient.

  As proposed in Patent Document 2, a reflector having a paraboloid or a free-form surface is used for a high-intensity LED illumination device used outdoors, and this reflector surrounds the LED. Since it is adopted, the device cannot be thinned in the depth direction, and there is a problem that a large space is required for mounting the LED lighting device to a building material or the like.

  Accordingly, a first object of the present invention is to provide an LED lighting device that can be thinned in the depth direction by eliminating a reflector.

  On the other hand, higher output is required for the LED lighting device, and recently, an LED lighting device having an input power exceeding 200 W has been developed. Since the amount of heat generated by the LED increases as the power of the LED lighting device increases, a cooling structure for driving the temperature lower and stably is important in the LED whose life and output change depending on the temperature. It has become a challenge.

  Accordingly, a second object of the present invention is to provide an LED lighting device that can suppress the temperature rise of the LED and realize high output.

  In order to achieve the above object, an invention according to claim 1 is an LED illuminating device comprising a light source unit formed by arranging a plurality of LEDs and a plurality of optical lenses arranged adjacent to each LED of the light source unit. The optical lens is provided with a refraction control unit for controlling light from each LED by refraction and a reflection control unit for controlling light from each LED by reflection.

  According to a second aspect of the present invention, in the first aspect of the invention, the reflection control unit provided in each of the optical lenses is disposed around the refraction control unit so as to surround the refraction control unit.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the reflection control unit utilizes total reflection at an optical lens / air interface.

  The invention according to claim 4 is the invention according to claim 3, wherein the surface of each optical lens is a convex curved surface, and the cross-sectional saw blade shape that constitutes the reflection control unit around the center of the back surface of each optical lens. An incident surface and a reflecting surface are formed.

According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, a pitch interval between adjacent ones of a pair of optical systems in which the LEDs and the optical lenses corresponding thereto are combined. When P, the distance between the LED of each optical system and the optical lens is F, the thickness of each optical lens is T, and the effective light incident angle to each optical lens is θ, the pitch interval P is expressed by the following formula:
(F + T) × tan θ × 1.0 ≦ P <(F + T) × tan θ × 1.2
Is set to a value that satisfies the above.

  The invention described in claim 6 is characterized in that, in the invention described in any one of claims 1 to 5, a water cooling unit including a water cooling jacket, a radiator, a circulation pump and a fan is provided.

  The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein the optical lens is made of polycarbonate.

  According to the first aspect of the present invention, since each optical lens includes a refraction control unit and a reflection control unit, the light emitted from each LED is subjected to refraction control and reflection control in each optical lens so that a desired light distribution pattern is obtained. can get. Thus, since a desired light distribution pattern can be obtained with only an optical lens, a reflector that has been necessary in the past is unnecessary, and as a result, the LED illumination device can be thinned in the depth direction. A space merit can be obtained for mounting.

  According to the second aspect of the present invention, the light from each LED is distributed by the refraction control unit disposed at the central portion up to the effective light incidence angle to each optical lens, and is incident on the periphery other than the refraction control unit. By controlling the reflection of light by the reflection control unit, almost all of the light can be taken into the optical lens without omission, so that highly efficient and highly accurate light distribution control can be performed without providing a reflector.

  According to the invention described in claim 3, since the reflection control unit uses total reflection at the optical lens and the air interface, there is no need for a production process of the reflection film when the method of providing the reflection film is adopted. This is advantageous in terms of cost.

  According to the invention described in claim 4, since the surface constituting the reflection control unit surrounding the central portion of the back surface of each optical lens is configured by the incident surface and the reflection surface having a sawtooth cross section, the light from each LED is The light is efficiently collected by the optical lens to increase the use efficiency and to enable highly accurate light distribution control.

  According to the fifth aspect of the present invention, by setting an allowable range of the pitch interval P between adjacent ones of a plurality of sets of optical systems, the light from one set of optical systems is applied to the optical lens of the adjacent optical system. By reducing the pitch interval P as much as possible within the range where the light does not enter, the light source unit, and thus the LED lighting device as a whole can be reduced in size and size.

  According to the sixth aspect of the present invention, the heat generated in the LED is cooled by the cooling water flowing through the circulation path of the water cooling unit, and the heat received from the LED by the cooling water is released to the outside air by the radiator. For this reason, the LED is forcibly cooled to suppress an increase in temperature, and as a result, high output of the LED lighting device is realized.

  According to the seventh aspect of the present invention, since the optical lens is made of polycarbonate having higher optical refraction than other resin materials such as an acrylic material, it is possible to further reduce the thickness of the LED lighting device in the depth direction. Further, since polycarbonate has high mechanical breaking strength and impact resistance, the durability of the optical lens formed thereby is enhanced.

It is a perspective view of the LED lighting apparatus which concerns on this invention. It is a figure of the arrow A direction of FIG. It is a figure of the arrow B direction of FIG. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is the EE sectional view taken on the line of FIG. It is a disassembled perspective view of the LED lighting apparatus which concerns on this invention. It is a basic block diagram of the water cooling unit of the LED lighting apparatus which concerns on this invention. It is the front view which looked at the optical lens of the light source part from the back side. FIG. 10 is a sectional view taken along line FF in FIG. 9. It is a figure which shows the light distribution pattern by an optical lens. It is sectional drawing of an adjacent optical system.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  First, the whole structure of the LED lighting apparatus which concerns on this invention is demonstrated below based on FIGS. 1 is a perspective view of the LED lighting device according to the present invention, FIG. 2 is a view in the direction of arrow A in FIG. 1, FIG. 3 is a view in the direction of arrow B in FIG. 1, and FIG. FIG. 5 is a sectional view taken along the line DD of FIG. 3, FIG. 6 is a sectional view taken along the line EE of FIG. 3, FIG. 7 is an exploded perspective view of the LED lighting device according to the present invention, and FIG. It is a basic block diagram of the water-cooling unit of LED lighting apparatus.

  As shown in FIGS. 4 to 7, the LED lighting device 1 according to the present invention is configured by incorporating a light source unit 3, an air cooling unit 4, and a water cooling unit 5 inside a rectangular box-shaped housing 2. In addition, the upper and lower sides of the LED lighting device 1 in the following description are in the state shown in FIG. 1, and the LED lighting device 1 is not necessarily installed in the state shown in FIG.

  The housing 2 is made of a resin such as PC or a metal such as aluminum. As shown in FIG. 1, an air inlet 6 composed of a plurality of longitudinally long slits is formed on the peripheral surface of the housing 2. Is formed with an exhaust port 7 composed of a plurality of fan-shaped slits. And the lower surface of this housing 2 is opened, The said light source part 3 is engage | inserted and fixed to this opening part.

  As shown in FIGS. 4 to 7, the light source unit 3 includes a plurality (9 in the illustrated example) of metal substrates 9 each including an LED 8 (see FIG. 8) that is a light source, and these metal substrates 9. A rectangular plate-like base 10 to be attached and a rectangular plate-like transparent resin lens plate 11 fitted into the lower surface opening of the housing 2 are configured. Here, a plurality (9 in the illustrated example) of optical lenses 11 </ b> A as convex lenses are formed on the lens plate 11 corresponding to the respective LEDs 8. In FIG. 7, reference numeral 12 denotes a cable connector.

  In the present embodiment, the nine metal substrates 9 on which the LEDs 8 are mounted are arranged in a matrix of three rows and columns, and correspondingly, the base 10 made of aluminum die-casting also has the same number of pedestals as the LEDs 8. 10a (refer to FIG. 4 and FIG. 6) is integrally projected in a matrix form of three rows. The lens plate 11 also has nine optical lenses 11A corresponding to the respective LEDs 8 arranged in a matrix of three columns in the vertical and horizontal directions. Each metal substrate 9 is fixed to each pedestal 10a of the base 10 with screws through a rectangular heat conductive sheet 13. In addition, each heat conductive sheet 13 is comprised with the silicon | silicone etc. with insulation and high heat conductivity.

  In the air cooling unit 4, as shown in FIG. 7, a rectangular box-shaped circuit case 14 whose bottom surface is open functions as a heat sink, and various electronic components (not shown) are mounted inside the circuit case 14. The circuit board 15 is assembled, and the lower surface opening is covered with a rectangular plate-like cover 16. Here, the circuit case 14 is formed by aluminum die casting or the like having a high thermal conductivity, and a large number of heat radiation pins 17 constituting a heat radiation portion are integrally projected on the upper surface thereof. A circuit board 15 is in close contact with the inner upper surface of the circuit case 14 via a rectangular heat conductive sheet 18 made of silicon or the like having high insulation and thermal conductivity. Note that an O-ring 19 is interposed at the joint between the circuit case 14 and the cover 16, and the inside of the circuit case 14 is sealed by the sealing action of the O-ring 19, and water or the like from the outside into the circuit case 14. Intrusion is prevented. Further, in the present embodiment, the heat dissipation pin 17 protrudes from the circuit case 14, but a heat dissipation fin may be formed in the circuit case 14 instead of the heat dissipation pin 17.

  As shown in FIGS. 4 to 8, the water cooling unit 5 includes a water cooling jacket 20 that is a heat exchanger, and heat of the cooling water that has received heat in the water cooling jacket 20 and is heated to the outside air (cooling air). A radiator 21 for cooling by replacement, a fan 22 for supplying cooling air to the radiator 21, a circulation pump 23 for circulating the cooling water in a closed loop circulation path, and a reserve tank 24 for storing the cooling water. 22 is disposed above the radiator 21 so as to face it.

  By the way, the water cooling jacket 20 is formed in a hollow rectangular plate shape, and a cooling water passage is formed therein as shown in FIGS. As shown in FIGS. 5 and 7, an inlet pipe 25 into which cooling water cooled by heat exchange with the outside air (cooling air) in the radiator 21 flows on one end of the cooling jacket 10, and the water cooling An outlet pipe 26 is provided to discharge the cooling water whose temperature has been increased by receiving heat in the jacket 20.

  Thus, in the present embodiment, as shown in FIGS. 4 and 6, the water cooling jacket 20 is horizontally disposed at the bottom of the lower portion in the housing 2, and air cooling is performed above and below the water cooling jacket 20. A unit 4 and a light source unit 3 are arranged. Here, in the light source unit 3 disposed on the lower surface side of the water cooling jacket 20, the base 10 is in close contact with the lower surface of the water cooling jacket 20 via a rectangular heat conduction sheet 27. In the present embodiment, the heat conductive sheet 27 is made of silicon or the like having high insulation and thermal conductivity.

  The air cooling unit 4 is disposed on the upper surface side of the water cooling jacket 20 with the cover 16 in close contact with the upper surface of the water cooling jacket 20. In this embodiment, an antifreeze liquid obtained by mixing water with propylene glycol is used as the cooling water.

  On the other hand, as shown in FIGS. 4 and 6, the radiator 21 and the fan 22 are disposed in the upper part of the housing 2 apart from the water cooling jacket 20, and a space portion is provided between the water cooling jacket 20 and the radiator 21. S is formed, and the air cooling unit 4, the circulation pump 23, and the reserve tank 24 are disposed in the space S. Specifically, a gate-shaped chassis 28 is erected on the water cooling jacket 20, the air cooling unit 4 is arranged in a space surrounded by the chassis 28, and the circulation pump 23 and the reserve tank 24 are provided on the chassis 28. is set up.

  Here, as shown in FIGS. 5 and 8, a pipe (rubber hose) 29 rising upward from the outlet pipe 26 of the water cooling jacket 20 is connected to the inlet pipe 30 of the radiator 21, and from the outlet pipe 31 of the radiator 21. The extending pipe (rubber hose) 32 extends downward and is bent at a substantially right angle and connected to the suction side of the circulation pump 23. A pipe (rubber hose) 33 extending from the discharge side of the circulation pump 23 is connected to the inlet side of the reserve tank 24 as shown in FIG. 8, and a pipe (rubber hose) 34 extending downward from the outlet side of the reserve tank 24. Is connected to the inlet pipe 25 of the water cooling jacket 20. Thus, the water cooling jacket 20, the radiator 21, the circulation pump 23, and the reserve tank 24 are connected by the pipes (rubber hoses) 29, 32 to 34 to form a circulation path that forms an open loop. Circulation provides the required cooling action.

  Next, details and operations of the configuration of the light source unit 3 constituting the gist of the present invention will be described with reference to FIGS.

  9 is a front view of the optical lens of the light source section viewed from the back side, FIG. 10 is a cross-sectional view taken along line FF of FIG. 9, FIG. 11 is a diagram showing a light distribution pattern by the optical lens, and FIG. FIG.

  9 and 10 show one LED 8 and one optical lens 11A corresponding to the LED 8, and each optical lens 11A has a circular refraction control unit 11a for controlling light from the LED 8 by refraction facing the LED 8. A ring-shaped reflection control unit 11b that is provided at the center and controls light from the LED 8 by reflection is provided around the refraction control unit 11a.

  By the way, since the directivity angle characteristic emitted from the LED 8 generally has a Lambertian light emission, each optical lens 11A captures the Lambertian light emission without omission, and the desired light is transmitted after passing through the optical lens 11A. It is configured to have a light distribution angle characteristic. Specifically, since it is particularly suitable for obtaining spot-like light distribution on the optical axis X of the optical lens 11A, the refraction control unit 11a is arranged in the range of the emission light emission angle α shown in FIG. The reflection control unit 11b is arranged in the region of the Lambashian light emitting unit up to the emission emission angle β.

  Each optical lens 11A is made of polycarbonate having an optical refractive index of 1.58, the front surface a is made of a circular convex curved surface, and the circular convex curved surface constituting the refractive control unit 11a is formed at the center of the back surface. b is formed, and two convex portions 11c and 11d having a saw-tooth cross-sectional shape constituting the reflection control portion 11b are formed concentrically on the inside and outside. Here, the convex portions 11c and 11d are respectively provided with incident surfaces c and e substantially parallel to the optical axis X direction of the LED 8, and reflecting surfaces d and f forming arcuate convex curved surfaces, respectively. d and f use total reflection at the optical lens 11A and the air interface. Although the configuration of one LED 8 and one optical lens 11A corresponding to the LED 8 has been described above, the other LEDs 8 and the optical lens 11A are configured in the same manner.

  Thus, when the LED lighting device 1 including the light source unit 3 configured as described above is activated and power is supplied to the light source unit 3, the circuit board 15 in the circuit case 14, and the water cooling unit 5, the light source A plurality of (9 in this embodiment) LEDs 8 of the section 3 emit light, and the light passes through each optical lens 11A provided on the lens plate 11 and is irradiated downward in FIG. Illuminate. Here, the path of light emitted from each LED 8 is indicated by an arrow in FIG. 10, but the light L0 emitted from the LED 8 and incident on the refraction control unit 11a at the center of the optical lens 11A is refraction control unit 11a. And is emitted from the surface a of the optical lens 11A in the direction of the arrow (upward in FIG. 10) for illumination.

  Lights L1 and L2, which are emitted from the LED 8 and are incident on the optical lens 11A from the incident surfaces c and e of the convex portions 11c and 11d of the reflection control unit 11b around the optical lens 11A, are respectively projected into the convex portions 11c and 11d. After being refracted inside, the light reaches each of the reflection surfaces d and f, and is totally reflected by each of the reflection surfaces d and f, and is emitted from the surface a of the optical lens 11A in each direction shown in FIG. Here, FIG. 11 shows a light distribution pattern obtained by controlling the refraction and reflection of the light from each LED 8 through the optical lens 11A. As shown in FIG. 11, the refraction of the optical lens 11A is shown. The light L0 whose refraction is controlled by the control unit 11a is distributed in the central portion, and the light L2 and L1 whose reflection is controlled by passing through the convex portions 11d and 11c having a sawtooth cross section of the reflection control unit 11b are distributed around the light L0. To do.

  As described above, in the LED lighting device 1 according to the present invention, each optical lens 11A includes the refraction control unit 11a and the reflection control unit 11b, and thus the lights L0 to L2 emitted from the LEDs 8 are the optical lenses. A desired light distribution pattern as shown in FIG. 11 is obtained by performing refraction control and reflection control in 11A. Thus, since a desired light distribution pattern can be obtained with only the optical lens 11A, a reflector that has been necessary in the past is not necessary, and as a result, the LED illumination device 1 can be thinned in the depth direction. Space merit can be obtained for mounting to building materials. Conventionally, a distance of 20 mm or more is required between the emitting surface of the LED and the optical lens surface, but in this embodiment, the distance can be reduced to 10 mm.

  In the present embodiment, the light from each LED 8 is distributed by the refraction control unit 11a disposed at the central portion up to the effective light incident angle α to each optical lens 11A, and the light emission emission other than the refraction control unit 11a. Almost all the light can be taken into the optical lens 11A without leakage by controlling the light incident on the reflection control unit 11b arranged in the region of the Lambtian light emitting unit up to the angle β, so that no reflector is provided. Highly efficient and highly accurate light distribution control is possible.

  In the present embodiment, the reflection control unit 11a of the optical lens 11A uses total reflection at the air interface with the optical lens 11A. This eliminates the need for a production process and is advantageous in terms of cost.

  Furthermore, in the present embodiment, the optical lens 11A is made of polycarbonate having higher optical refraction than other resin materials such as an acrylic material, so that the LED lighting device 1 can be further thinned in the depth direction. In addition, since polycarbonate has high mechanical breaking strength and impact resistance, the durability of the optical lens 11A constituted thereby is enhanced.

Here, when one LED 8 and one optical lens 11A corresponding thereto are combined to form a set of optical systems, as shown in FIG. 12, the pitch interval between adjacent optical systems is P, When the distance between the LED 8 and the optical lens 11A is F, the thickness of each optical lens 11A is T, and the effective light incident angle to each optical lens 11A is θ, the pitch interval P is expressed by the following formula:
(F + T) × tan θ × 1.0 ≦ P <(F + T) × tan θ × 1.2
Is set to a value that satisfies.

  Thus, by setting the allowable range of the pitch interval P between adjacent ones of a plurality of sets of optical systems as in the above formula, the optical lens of another optical system in which the light from one set of optical systems is adjacent It is possible to reduce the size and size of the light source unit 3 and the LED lighting device 1 as a whole by reducing the pitch interval P as much as possible within a range not incident on 11A.

  By the way, when the LED lighting device 1 is activated and the LED 8 of the light source unit 3 emits light, the LED 8 and various electronic components (not shown) of the circuit board 15 that controls the lighting of the LED 8 generate heat. 15 is overheated and the temperature rises.

  However, in this embodiment, the water cooling unit 5 is driven simultaneously, and the circuit case 14 as the heat sink of the light source unit 3 and the air cooling unit 4 is forcibly cooled by the cooling water circulating in the circulation path shown in FIG. The rise is suppressed. Further, heat generated in the light source unit 3 and the circuit board 15 is conducted to the circuit case 14, and is radiated from the surface of the circuit case 14 and a large number of heat radiation pins 17. The cooling air is introduced into the exhaust port 7 and flows toward the exhaust port 7.

  In the water cooling unit 5, the cooling water circulated through the circulation path by the circulation pump 23 receives heat generated in the light source unit 3 and the circuit board 15 in the water cooling jacket 20, and receives the light source unit 3, the circuit case 14, and the circuit board therein. The cooling water that has cooled 15 and received heat and having a high temperature is introduced into the radiator 21 through the pipe 29.

  On the other hand, when the fan 22 is rotationally driven by a motor (not shown), the outside air is sucked from the side as the cooling air from the air inlet 6 formed in the peripheral surface of the housing 2, and this cooling air is supplied to the water cooling jacket. 20 flows upward through a space S formed between 20 and the radiator 21, passes through the radiator 21 in the process, and is discharged to the outside through the exhaust port 7 opened on the upper surface of the housing 2. In the radiator 21, the heat of the cooling water is radiated to the outside by the cooling air passing through the radiator 21 to cool the cooling water, and the cooling liquid water whose temperature has decreased is sucked into the circulation pump 23 through the pipe 32. Is done.

  The cooling water sucked into the circulation pump 23 is boosted and then sent out from the circulation pump 23 through the pipe 33 to the reserve tank 24, a part of which is stored in the reserve tank 24, and the remaining cooling water is stored in the reserve tank 24. Is introduced into the water-cooling jacket 20 through the pipe 34 to be used for cooling the light source unit 3, the circuit case 14, and the circuit board 15 inside thereof. The above action (cooling cycle) is continuously repeated, and the light source unit 3, the circuit case 14, and the circuit board 15 are forcibly cooled by the cooling water flowing through the water cooling jacket 20, and their temperature rise is suppressed to a certain value or less. It is done.

  Thus, in the present embodiment, the air cooling unit 4 and the light source unit 3 are disposed above and below the water cooling jacket 20, so that the cooling water circulates in the closed loop circulation path by the circulation pump 23. The light source unit 3, the circuit case 14, and the circuit board 15 disposed on both sides of the 20 are simultaneously forcibly cooled by the cooling water. Further, the circuit case 14 and the circuit board 15 are air-cooled by heat radiation from the air-cooling unit 4. As a result, the temperature rise of these light source parts 3 and the circuit board 15 is suppressed, and high output of the LED lighting device 1 is realized.

DESCRIPTION OF SYMBOLS 1 LED lighting apparatus 2 Housing 3 Light source part 4 Air cooling unit 5 Water cooling unit 6 Intake port 7 Exhaust port 8 LED
DESCRIPTION OF SYMBOLS 9 Metal board 10 Base 10a Base of base 11 Lens plate 11A Optical lens 11a Refraction control part of optical lens 11b Reflection control part of optical lens 11c, 11d Convex part of optical lens 12 Cable connector 13 Thermal conduction sheet 14 Circuit case 15 Circuit board 16 Cover 17 Radiation Pin 18 Thermal Conductive Sheet 19 O-ring 20 Water Cooling Jacket 21 Radiator 22 Fan 23 Circulation Pump 24 Reserve Tank 25 Water Cooling Jacket Inlet Pipe 26 Water Cooling Jacket Outlet Pipe 27 Heat Conducting Sheet 28 Chassis 29 Piping (Rubber Hose)
30 Radiator inlet pipe 31 Radiator outlet pipe 32-34 Piping (rubber hose)
a surface of optical lens b convex surface of optical lens back surface c, e incident surface of optical lens d, f exit surface of optical lens F distance between LED and optical lens P pitch interval between adjacent optical systems T thickness of optical lens X Optical axis α, β Light emission angle θ Effective light incident angle on optical lens S Space

Claims (7)

In an LED lighting device including a light source unit formed by arranging a plurality of LEDs and a plurality of optical lenses arranged adjacent to each LED of the light source unit,
An LED illumination device, wherein a refraction control unit that controls light from each LED by refraction and a reflection control unit that controls light from each LED by reflection are provided in each optical lens.   The LED illumination device according to claim 1, wherein the reflection control unit provided in each of the optical lenses is arranged around the refraction control unit so as to surround it.   The LED illumination device according to claim 1, wherein the reflection control unit uses total reflection at an optical lens and an air interface.   The surface of each of the optical lenses is a convex curved surface, and an incident surface and a reflecting surface that form a sawtooth cross section forming the reflection control unit are formed around the center of the back surface of each optical lens. 3. The LED lighting device according to 3. P is the pitch interval between adjacent ones of a pair of optical systems in which each LED and the corresponding optical lens are combined, F is the distance between the LED and the optical lens in each optical system, and the thickness of each optical lens is T, where the effective angle of light incident on each optical lens is θ, the pitch interval P is expressed by the following formula:
(F + T) × tan θ × 1.0 ≦ P <(F + T) × tan θ × 1.2
The LED illumination device according to claim 1, wherein the LED illumination device is set to a value satisfying the above.   The LED lighting device according to claim 1, further comprising a water cooling unit including a water cooling jacket, a radiator, a circulation pump, and a fan.   The LED illumination device according to claim 1, wherein the optical lens is made of polycarbonate.

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