JP3821564B2 - Two-layer reflection type LED lighting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reflective LED illuminating device in which a plurality of reflective LED elements are arranged on a substrate to form a surface light source. More specifically, an increase in the integration density of reflective LED elements mounted on a substrate is considered. The present invention relates to a reflective LED lighting device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is a light emitting diode (referred to as a shell-type light emitting diode) having a structure in which a reflective surface is provided around the element in order to effectively emit light emitted from the light emitting diode element to the outside.
This bullet-type light emitting diode has a low integration rate and a large shape, so it is not suitable for making a surface light source using a plurality of elements.
Therefore, in order to further increase the light emission efficiency of the light emitting diode element, a reflection type light emitting diode that emits only reflected light to the outside without directly emitting light directly has been proposed (Japanese Patent Laid-Open No. 1-205480).
[0003]
FIG. 4 shows the structure of the reflective LED element.
The infrared LED element 50 is fixed to the end of the lead frame 49, wire bonding is performed between the infrared LED element 50 and the lead frame 48, and a predetermined current is supplied from the lead frames 48 and 49. A concave reflector 53 is disposed facing the radiation surface of the infrared LED element 50, and the light 52 in the infrared region reflected by the concave reflector 53 passes through the glass plate 51 having an infrared transmission filter function. Are emitted in the front direction (outside).
The lead frames 48 and 49 and the dummy lead frames 44 and 45 have a structure extending outward from the side surface of the reflective LED element.
[0004]
[Problems to be solved by the invention]
FIG. 5 is a diagram illustrating an example of a surface light source configured by mounting the reflective LED element of FIG. 4 on a substrate.
In the side view of (a), a long groove 54 is provided in the substrate 56, and through holes 56a, 56b,... For inserting lead frames 44, 45, 48 and 49 are formed on the outside thereof. When the reflective LED element 43 is attached to the substrate, the concave reflector 53 is fitted into the long groove 54 and the heat radiated from the infrared LED element 50 is released from the long groove 54.
[0005]
As described above, a large number of reflective LED elements 43 mounted on the substrate are arranged in the y direction as shown in FIG.
Since the circuit pattern 55 is provided between the reflective LED elements 43 and the through holes for the lead frames 44, 45, 48 and 49 are further provided, the arrangement of the reflective LED elements 43 in the x direction is A predetermined interval must be secured between each element.
For example, when the reflective LED elements 43 having a lateral length of 11.0 mm are arranged, the distance between the elements is about 5 mm.
[0006]
For this reason, when the reflective LED elements 43 are arranged on the substrate, even if the reflective LED elements 43 can be arranged in high density in the y direction, a space that does not contribute to the amount of light is generated between the reflective LED elements in the x direction. The amount of light emitted from the surface light source cannot be increased without increasing the area.
An object of the present invention is to provide a reflective type having a two-layer structure in which the total amount of infrared light can be increased without increasing the entire area by arranging reflective LED elements at high density in the x direction. The object is to provide an LED lighting device.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, a reflective lighting apparatus having a two-layer structure according to the present invention has an LED element to which a lead frame is fixed facing a concave reflector, and emits light emitted from the LED element. a reflection type LED element is reflected in the form reflector, to a plurality arranged the reflection type LED elements on the surface, the first LED unit substrate layer having a long groove between the rows and columns of the reflective type LED element, the A reflective LED illumination device having a two-layer structure, which is disposed under the first LED unit substrate layer and includes a second LED unit substrate layer in which a plurality of reflective LED elements are arranged so as to be viewed from the long groove. The lead frame is inserted into the through hole through the first and second LED unit substrate layers, and the reflective LED element is disposed on the back surface of the first and second LED unit substrate layers. They were are configured by providing a current supply pattern on the opposite side position of the position.
Moreover , this invention is the said structure, The said reflection type LED element is comprised by the some infrared LED element.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing an embodiment of a reflective LED lighting apparatus having a two-layer structure according to the present invention.
The reflective LED lighting device is composed of a first LED unit substrate layer 2 and a second LED unit substrate layer 3.
A large number of long grooves 4a to 4n are provided on the substrate 4 of the first LED unit substrate layer 2, and a large number of reflective LED elements 1 are arranged in the vertical direction across the long grooves.
[0009]
Also on the substrate 5 of the second LED unit substrate layer 3, a large number of reflective LED elements 8 are arranged in the vertical direction at positions corresponding to the long grooves 4a to 4n.
The lead frames of the reflective LED elements 1 and 8 are inserted into the through holes and soldered to lands 11 and 12 provided on the back surface of the substrate.
Circuit patterns 6 and 7 are provided on the back surfaces of the substrates 4 and 5 on the back side of the concave reflectors of the reflective LED elements 1 and 8. The circuit patterns 6 and 7 are connected to the lands 11 and 12, and current is supplied from the circuit patterns 6 and 7 to the reflective LED elements 1 and 8.
[0010]
A glass plate 8a having an infrared filter function of the reflective LED elements 8 in the A 'row of the second LED unit substrate layer 3 is disposed in the long groove 4a between the A row and the B row of the first LED unit substrate layer 2. Only the top of the reflective LED element 8 in the A ′ row is radiated upward. Similarly, the glass plates 8a of the reflective LED elements 8 in the B ′ row, the C ′ row,... Are viewed from the long grooves, and infrared light is emitted upward.
[0011]
In the x direction, the lead frame 9 of the reflective LED element 1 in the A row of the first LED unit substrate layer 2 and the lead frame 10 of the reflective LED element 8 in the A ′ row of the second LED unit substrate layer 3 are Although the land positions are very close to each other, focusing on the z direction, the lead frame 9 is soldered to the land 11 of the substrate 4 and the lead frame 10 is soldered to the land 12 of the substrate 5, respectively. , Never touch.
Therefore, the integration density of the reflective LED elements can be increased in the x direction, and the total emission amount of infrared light can be increased without changing the entire area.
[0012]
2A and 2B are diagrams for explaining the structure of the reflective LED element used in FIG. 1, in which FIG. 2A is a front sectional view showing the internal structure, and FIG. It is a bottom view shown.
The first infrared LED element 15 is mounted on the tip of the first lead frame 23, and the second infrared LED element 16 is mounted on the tip of the fourth lead frame 26. A wire 21 is bonded between the first infrared LED element 15 and the tip of the third lead frame 25, and a wire 20 is bonded between the second infrared LED element 16 and the tip of the second lead frame 24. Has been.
The first and second infrared LED elements 15 and 16 are disposed on the focal plane 27 of the concave reflector 19 and on the diagonal line with the center 28 interposed therebetween.
[0013]
Infrared light emitted from the first and second infrared LED elements 15 and 16 is reflected by the concave reflector 19, passes through the glass plate 17 having an infrared transmission filter function, and is emitted to the outside. Infrared light is emitted at an irradiation angle of 8 degrees, for example.
When a reflective LED element having two built-in elements as shown in FIG. 2 is mounted in addition to one having a single infrared LED element, the amount of light is further increased by 1.5 to 1.7 times.
[0014]
FIG. 3 is a schematic diagram of a moving body recognition system (vehicle recognition apparatus) showing an example of use of a two-layer reflective LED illumination apparatus according to the present invention.
A device support 42 is provided on the road 36 by a gate pole 40, a high-definition camera 39 is mounted at the center of the device support 42, and a reflective LED element having a lead terminal according to the present invention on both sides is mounted. LED lighting devices 37 and 38 are respectively arranged. A travel time measuring terminal device 41 incorporating a high-definition image processing board is attached to the lower part of the gate pillar 40.
[0015]
Under the control of the travel time measuring terminal device 41, the high-definition camera 39 and the reflective LED lighting devices 37 and 38 are controlled. When the vehicle 35 is detected, infrared light is emitted and an image of the vehicle 35 is applied to the high-definition camera 39. It is captured.
This vehicle recognition device recognizes a vehicle passing by the travel time measurement terminal device 41, and further recognizes the passing vehicle by the travel time measurement terminal device of the vehicle recognition device installed next, so Information such as time is obtained.
[0016]
Compared to the strobe device, the reflective LED irradiation device has a sharp directional characteristic edge in the area to be irradiated and a flat light distribution characteristic. It has a feature that it can provide sufficient brightness (luminance) to shoot a subject surface. Furthermore, it has the characteristic that it can irradiate continuously for a very short time, for example, 1/30 to 1/15 second interval. As described above, the light distribution characteristic of the strobe device is flat, but according to the present invention, since the integration density of the reflection type LED elements is increased by using a two-layer structure, the light emitting surface of the device is reduced. It is possible to obtain a reflective LED lighting device having a good light distribution characteristic in which the amount of emitted light is further increased without enlarging.
The high-definition camera 39 captures a still image of the vehicle 35 with image quality that can identify a number plate or the like. Since the next preparation for photographing can be performed at an interval of 1/15 to 1/30 seconds, even if another vehicle follows up, it can be photographed if the time interval is not less than the above-mentioned time interval.
[0017]
【The invention's effect】
While the present invention as described is arranged to face the LED element lead frame is fixed to a concave reflector, a reflection type LED element for reflecting the light emitted from the LED element emits light by the concave reflector A plurality of reflective LED elements are arranged on the surface, the first LED unit substrate layer provided with a long groove between the rows of reflective LED elements, and disposed below the first LED unit substrate layer, A reflection type LED lighting device having a two-layer structure comprising a second LED unit substrate layer in which a plurality of reflection type LED elements are arranged so as to be viewed from the long groove, wherein the lead frame includes the first and second lead frames. The LED unit substrate layer is inserted into the through hole, and is configured by providing a current supply pattern on the back surface of the first and second LED unit substrate layers and opposite to the position where the reflective LED element is disposed. It is a thing.
Therefore, according to the present invention, the amount of emitted light can be increased without increasing the size of the surface light source, and an infrared illumination device such as a vehicle recognition device suitable for capturing a high-quality image can be obtained. .
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of a reflective LED lighting device having a two-layer structure according to the present invention.
2A and 2B are diagrams for explaining the structure of a reflective LED element used in FIG. 1, in which FIG. 2A is a front sectional view showing an internal structure, and FIG. It is a bottom view shown.
FIG. 3 is a schematic view showing an example of a moving object recognition system using a reflective LED lighting device having a two-layer structure according to the present invention.
FIG. 4 is a diagram showing the structure of a reflective LED element.
5A and 5B are views showing a state where the reflective LED element of FIG. 4 is mounted on a substrate, where FIG. 5A is a side view and FIG. 5B is a plan view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 8, 43 ... Reflective type LED element 2 ... 1st LED unit board | substrate layer 3 ... 2nd LED unit board | substrate layer 4, 5 ... Board | substrate 4a-4n, 54 ... Long groove | channel 6, 7 ... Circuit pattern 9,10, 48, 49 ... lead frames 11, 12 ... land 15 ... first infrared LED element 16 ... second infrared LED element 17 ... glass plate 18 ... light in the infrared region 19 ... concave reflectors 20, 21 ... Wire 23 ... First lead frame 24 ... Second lead frame 25 ... Third lead frame 26 ... Fourth lead frame 27 ... Focal plane 28 ... Center 35 ... Vehicle 36 ... Roads 37, 38 ... Reflective LED illumination Device 39 ... High-definition camera 40 ... Portal 41 ... Travel time measuring terminal device 42 ... Device support 44, 45 ... Dummy lead frame

Claims (2)

The LED element lead frame is fixed arranged to face the concave reflector, and reflection type LED element in which the LED elements to reflect light emitted by the concave reflector,
A plurality of the reflective LED elements arranged on the surface, a first LED unit substrate layer provided with a long groove between the rows of the reflective LED elements ;
Disposed below the said first LED unit substrate layer, a plurality of reflection type LED elements reflective LED lighting device having a two-layer structure consisting of a second LED unit substrate layers arranged as excluding from the long groove Because
The lead frame is inserted into the through hole through the first and second LED unit substrate layers, and is on the back side of the first and second LED unit substrate layers and opposite to the position where the reflective LED element is disposed. A reflective LED illumination device having a two-layer structure , wherein a current supply pattern is provided at a position . 2. The reflection type LED lighting device having a two-layer structure according to claim 1, wherein the reflection type LED element is composed of a plurality of infrared LED elements.

Images