KR102137427B1 - Light emitting device lamp - Google Patents

Abstract

The embodiment relates to a light emitting element lamp.
The light emitting device lamp according to the embodiment includes: a light-transmitting portion extending in a tube shape, a circuit board disposed on one side of the light-transmitting portion, and including a first substrate and a second substrate spaced apart from each other, and the first substrate and the second substrate And a light emitting element disposed at predetermined intervals, and the light emitting element of the first substrate is disposed to correspond between two adjacent light emitting elements disposed on the second substrate, or the light emitting element of the second substrate is the first light emitting element. It is disposed correspondingly between two adjacent light emitting elements disposed on one substrate.
The light emitting device lamp according to this embodiment can reduce the influence of heat generation of the light emitting device and have excellent light uniformity.

Description

Light emitting element lamp {LIGHT EMITTING DEVICE LAMP}

The embodiment relates to a light emitting element lamp.

In general, a lamp is a device that supplies or controls light for a specific purpose. As a light source of the lamp, an incandescent light bulb, a fluorescent lamp, or a neon lamp may be used, and recently, an LED (Light Emitting Diode) is used.

LED is a device that changes the electrical signal to infrared or light by using the compound semiconductor characteristics, unlike fluorescent lamps, it does not use harmful substances such as mercury, so it causes little environmental pollution. In addition, LEDs have a longer lifespan and less power consumption than incandescent, fluorescent, and neon lamps. In addition, the LED may have an advantage of excellent visibility and less glare due to its high color temperature.

The lamp unit using LED is widely adopted by the above advantages, and is used, for example, in a backlight, a display device, a lighting lamp, or a head lamp.

However, while the LED has good efficiency in converting electric power into light, its light emitting portion is made of a semiconductor device, and thus has a disadvantage of being relatively vulnerable to heat compared to a light emitting device such as an incandescent lamp using a filament or a fluorescent lamp using a cathode ray. In other words, when the LED is used for a long time, the semiconductor device is easily degraded due to thermal stress caused by self-heat generated from the light emitting device, thereby degrading its performance. On the other hand, if fewer LED elements are used to solve the heat problem, excellent light uniformity due to the LED elements cannot be obtained.

Accordingly, there is a need for a light emitting device lamp capable of obtaining excellent light uniformity while using fewer LED devices to solve the heat generation problem.

The embodiment provides a light emitting device lamp capable of minimizing the influence of heat generated by the light emitting device and increasing the light uniformity.

In addition, since the embodiment does not require a heat radiator, it is possible to provide a light-emitting element lamp having a light weight.

In addition, the embodiment can reduce the number of light-emitting elements to provide a light-emitting element lamp having a reduced manufacturing cost.

The light emitting device lamp according to the embodiment includes: a light-transmitting portion extending in a tube shape, a circuit board disposed on one side of the light-transmitting portion, and including a first substrate and a second substrate spaced apart from each other, and the first substrate and the second substrate And a light emitting element disposed at predetermined intervals, and the light emitting element of the first substrate is disposed to correspond between two adjacent light emitting elements disposed on the second substrate, or the light emitting element of the second substrate is the first light emitting element. It is disposed correspondingly between two adjacent light emitting elements disposed on one substrate.

The light emitting device lamp according to this embodiment can reduce the influence of heat generation of the light emitting device and have excellent light uniformity.

Here, the first substrate and the light emitting elements disposed on the second substrate may be arranged in a zigzag form with each other.

The light emitting device lamp according to this embodiment can reduce the influence of heat generation of the light emitting device and have excellent light uniformity.

Here, the light emitting device is arranged to satisfy the equation (P / 2) / d <0.73, wherein P is the average interval between two adjacent light emitting devices disposed on each of the first substrate or the second substrate, the d may be a distance from the light emitting element to the light transmitting element in a direction perpendicular to the light emitting element. The light emitting device lamp according to this embodiment may have excellent light uniformity.

Here, the light emitting element is arranged to satisfy the equation (P / 2) × tan T × cos θ / d <0.5, wherein P is the average between adjacent light emitting elements disposed on each of the first substrate or the second substrate The interval, d is the distance from the light emitting element to the light emitting element in a direction perpendicular to the light emitting element, and θ is the line segment connecting the light emitting element and the upper center C of the light emitting portion and the light emitting element It is an emission angle formed with a vertical normal, and T is each day between a bisector dividing the light-transmitting part into left and right portions based on the inner center O of the light-transmitting part, and a line segment connecting the inner center O of the light-transmitting part with the light emitting element. Can. The light emitting device lamp according to this embodiment may have better light uniformity.

Here, the first substrate and the second substrate may each have a predetermined slope such that light emitted vertically from the light emitting element of the first substrate and the light emitting element of the second substrate intersects each other in the light transmitting portion. . The light emitting device lamp according to this embodiment can further convert light from the light emitting device to increase light uniformity.

Here, a structure disposed adjacent to the circuit board may be further included. The light emitting device lamp according to this embodiment can increase the rigidity of the light emitting device lamp.

Here, the structure may include at least one of plastic or glass fiber. The light emitting device lamp according to this embodiment can further increase the rigidity of the light emitting device lamp.

Here, the light-transmitting portion may include at least one of synthetic resin or glass. The vertical type light emitting device package according to this embodiment can increase the rigidity of the light emitting device lamp, increase the transparency, and increase the luminance of the light emitting material lamp.

Here, the synthetic resin may include at least one of the acrylic, PE or PVC, polycarbonate. The vertical type light emitting device package according to this embodiment can increase the rigidity of the light emitting device lamp, increase the transparency, and increase the luminance of the light emitting material lamp.

Here, the synthetic resin may contain a light diffusion agent that diffuses light from the light emitting element. The vertical type light emitting device package according to this embodiment can increase the rigidity of the light emitting device lamp, increase the transparency, and increase the luminance of the light emitting material lamp.

The light emitting device lamp according to the embodiment can minimize the influence of heat generated by the light emitting device and increase the light uniformity.

In addition, since a radiator is not required, the weight of the light emitting element lamp is light.

In addition, the number of light emitting elements can be reduced, thereby reducing the manufacturing cost of the light emitting element lamp.

1 is a perspective view of a light emitting device lamp according to an embodiment.
2A and 2B are cross-sectional views showing a light emitting device lamp of an embodiment taken along line II-II' in FIG. 1.
3 is a plan view of the circuit board and the light emitting device of the light emitting device lamp according to the embodiment, as viewed from above.
4A and 4B are cross-sectional views of a light emitting device lamp for measuring light uniformity of a light emitting device lamp according to an embodiment, and FIG. 4B is a result view of a spectrum in which light uniformity is measured.
5A is a graph showing changes in light uniformity in the center and side of a tube according to a distance index (D) value in the light emitting device lamp according to the embodiment, and 5B is a position (x, y) of the light emitting device 30 ) Is a graph showing the change in light uniformity at the center and side of the tube according to the tan T value, and FIG. 5c shows the change in light uniformity at the center and side of the tube according to the light emission angle (θ). It is the graph shown.
6 is a graph showing changes in light uniformity at the center and side of the tube according to the light uniformity determination index in the light emitting device lamp according to the embodiment.

In the drawings, the thickness or size of each layer is exaggerated, omitted, or schematically illustrated for convenience and clarity. Also, the size of each component does not entirely reflect the actual size.

In the description of the embodiment according to the present invention, when one element is described as being formed on "on or under" the other element, the upper (upper) or lower (On or under) includes both two elements directly contacting each other or one or more other elements formed indirectly between the two elements. In addition, when expressed as “on (up) or down (on or under)”, it may include the meaning of the downward direction as well as the upward direction based on one element.

Hereinafter, a light emitting device lamp according to an embodiment will be described with reference to the accompanying drawings.

1 is a perspective view of a light emitting device lamp according to an embodiment, FIGS. 2A and 2B are cross-sectional views showing a light emitting device lamp of an embodiment cut along the line II-II' of FIG. 1, and FIG. 3 shows light emission according to the embodiment It is a plan view of the circuit board of the device lamp and the light emitting device as viewed from above.

1 to 3, the light emitting device lamp 1 according to the embodiment is disposed on one side of the light-transmitting portion 10 and the light-transmitting portion 10 extending in a tube shape, and the first substrate 20a spaced from each other ) And a light emitting device 30 disposed at predetermined intervals on the circuit board 20 including the second substrate 20b, the first substrate 20a, and the second substrate 20b.

In addition, a structure 40 may be disposed on one side of the light-transmitting portion 10 on which the circuit board 20 is disposed to maintain rigidity of the light-transmitting portion 10.

In addition, the power socket 50 may be coupled to both ends or one side of the light emitting device lamp 1. The power socket 50 is a terminal to which external power is applied to input current to the light emitting element 30. The power socket 50 may include a connection pin 51.

1 to 3, the light-transmitting portion 10 of the light emitting device lamp 1 according to the embodiment may be cylindrical. The light transmitting unit 10 protects the light emitting element 30 disposed on the circuit board 20 and irradiates light emitted from the light emitting element 30 to the outside. The material of the light transmitting part 10 is synthetic resin or glass, and the synthetic resin may be any one of acrylic, PE or PVC, and polycarbonate. Particularly, when the light transmitting portion 10 is made of synthetic resin, the synthetic resin may contain a light diffusing agent that facilitates diffusion of light. Therefore, the rigidity of the light-transmitting portion 10 is increased, and the transparency of the light-transmitting portion 10 can be increased to increase the luminance of the light-emitting element lamp 1.

The circuit board 20 may be formed by being separated into at least two. For example, the circuit board 20 may include a first substrate 20a and a second substrate 20b. The circuit board 20 may be various materials such as a printed circuit board (PCB), a silicon wafer, and a resin, and preferably, may be a substrate made of aluminum having excellent thermal conductivity.

Here, the first substrate 20a and the second substrate 20b each have a certain slope, and are spaced apart from each other. Light emitting elements 30 are disposed on the first substrate 20a and the second substrate 20b, respectively, and the light emitting elements 30 emit light in a vertical direction. In order for the light emitting device lamp 1 to have a uniform light uniformity, the first substrate 20a and the second substrate 20b are formed by the light emitted from the light emitting device of the first substrate 20a and the second substrate 20b. It is more preferable to have a slope such that light emitted from the light emitting elements intersects each other.

The light emitting element 30 is disposed on the circuit board 20. The light emitting device 30 may be a light emitting diode (LED), but is not limited thereto. The light emitting diode 30 may be a red, green, blue, or white light emitting diode that emits red, green, blue, or white light, respectively, but is not limited thereto.

A light emitting diode is a type of solid element that converts electrical energy into light, and generally includes an active layer of a semiconductor material interposed between two opposing doped layers. When bias is applied to both ends of the two doped layers, holes and electrons are injected into the active layer and then recombined there to generate light, and the light generated in the active layer is emitted in all directions or in specific directions to emit light through the exposed surface. Will be released.

1 to 3, the circuit board 20 of the light emitting device lamp 1 according to the embodiment may be formed of a first substrate 20a and a second substrate 20b spaced from each other. The first substrate 20a and the second substrate 20b are each provided with a plurality of light-emitting elements 30 arranged at predetermined intervals. In this case, the light emitting device 30 may be disposed such that the distance between the first light emitting device 30a disposed on the first substrate 20a and the second light emitting device 30b disposed on the second substrate 20b is maximized. . For example, the second light emitting element 30b may be disposed to correspond between two adjacent first light emitting elements 30a. Also, the first light emitting element 30a may be disposed to correspond between two adjacent second light emitting elements 30b. Preferably, the first light emitting element 30a is arranged to correspond between adjacent second light emitting elements 30b, and the second light emitting element 30b can be arranged to correspond between adjacent first light emitting elements 30a. have. For example, as illustrated in FIG. 3, the light emitting elements 30a and 30b of the first substrate 20a and the second substrate 20b may be arranged in a zigzag form with each other.

When the light emitting elements 30a and 30b of the first substrate 20a and the second substrate 20b are arranged in a zigzag form, the light emitting elements 30a and 30b of the first substrate 20a and the second substrate 20b are Since the distances between the light emitting elements may be farther than those arranged in parallel with each other, there is an effect of reducing the influence due to heat generation of the light emitting element 30.

At this time, when the light emitting elements 30a and 30b of the first substrate 20a and the second substrate 20b are arranged in a zigzag manner, the light emitting element 30 may be arranged to satisfy the following equation (1).

[Equation 1]

D <0.73, [D = (P / 2) / d]

P denotes an average spacing P between adjacent light emitting elements in the first substrate 20a or the second substrate 20b, as shown in FIG. 3, and d denotes a light emitting device, as shown in FIG. 2A. (30) and the distance to the light-transmitting part (10) in the direction perpendicular to the light emitting element (30), and the distance index (D) is the value obtained by dividing 1/2 of the average distance (P) by the distance (d). to be.

If the distance index D is smaller than 0.73, the light emitting element lamp 1 has a predetermined light uniformity. If the distance index D is greater than 0.73, the light uniformity of the light emitting element lamp 1 is lowered to a predetermined value or less.

As the separation distance d increases, the distance between the light emitting element 30 and the light transmitting portion 10 increases, so that the light emitted from the light emitting element 30 diffuses and the range overlapped on the light transmitting portion 10 increases. As the range in which the light of the light emitting element 30 overlaps on the light transmitting part 10 increases, the light uniformity of light irradiated from the light emitting element lamp 1 increases. In addition, since the distance between the light emitting elements 30 decreases as the average interval P, which is the distance between the light emitting elements 30, becomes shorter, light emitted from the light emitting elements 30 overlaps on the light transmitting portion 10. The range that becomes becomes wider. Therefore, the light uniformity of light emitted from the light emitting element lamp 1 is increased. In addition, the light uniformity of light irradiated to the outside of the light emitting device lamp 1 varies depending on the position of the light emitting device 30 in the light transmitting unit 10 and the light emission angle from the light emitting device 30.

2A and 2B, the axis dividing the light transmitting part 10 up and down, based on the center O inside the light transmitting part 10, is divided into X axis and the light transmitting part 10 in right and left direction. Let's say the axis to be called the Y axis. At this time, the angle between the line segment connecting the light emitting device 30 and the upper center C of the light transmitting part 10 and the normal line perpendicular to the light emitting device 30 is defined as the emission angle θ, and the light transmitting part 10 If the distance on the X-axis from the center (O) to the light-emitting element 30 is set to x and the distance on the Y-axis is y, the line connecting the center (O) of the light-transmitting portion 10 and the light-emitting element 30 is connected to the Y-axis. Each T formed has a relationship of tan T = x/y.

Since two or more light-emitting elements 30 according to the embodiment are disposed inside the light-transmitting portion 10, and light must be irradiated upward through the light-transmitting portion 10, T is less than 45 degrees. Therefore, tan T has a value greater than 0 and less than 1. On the other hand, since the emission angle θ is also greater than 0 degrees and less than 45 degrees, cos θ also has a value greater than 0 and less than 1. Therefore, if (P / 2) × tan T × cos θ / d is defined as the optical uniformity determination index (L) for determining the optical uniformity, the value of the optical uniformity correction index (L) is also between 0 and 0.73.

Hereinafter, changes in the optical uniformity according to the optical uniformity determination index L will be described based on an experimental example in which the optical uniformity is measured in the light emitting device lamp 1 according to the embodiment.

4A is a schematic diagram for measuring the light uniformity of the light emitting device lamp 1 according to the embodiment, and FIG. 4B is a spectrum result in which the light uniformity is measured.

As shown in FIGS. 2A and 4B, light uniformity in the central portion of the light transmitting portion 10 is measured by measuring minimum and maximum luminance of light irradiated through the upper center C of the light transmitting portion 10. Can. Similarly, by measuring the minimum luminance and the maximum luminance of light irradiated through a point spaced a predetermined distance from the upper center (C) to the right side, it is possible to measure the light uniformity at the side of the light transmitting unit 10. In FIG. 4A, the luminance was measured at a point spaced from the upper center C of the light-transmitting unit 10 to the right, but it is not necessarily right, and it is sufficient to be spaced a predetermined distance from the upper center C. The smaller the difference between the minimum luminance and the maximum luminance, the better the light uniformity, so the value obtained by dividing the minimum luminance by the maximum luminance is closer to 1. The luminance of light irradiated through the light transmitting unit 10 may be measured using light irradiated to a slice having a width of 1 mm.

4A and 4B, to confirm whether light irradiated through the light emitting device lamp 1 has a light uniformity over the entire light emitting device lamp 1 rather than to a specific part, the light transmitting unit 10 ) The value of the luminance (C detector) of light passing through the slice of 1 mm width from the center and the luminance of the light (R detector) passing through the slice of 1 mm width of the point spaced apart from the center of the light emitting part 10 by a certain distance. Measure each value. In order for the light emitting element lamp 1 to have sufficient light uniformity over the entire light-transmitting portion 10 to which light is irradiated, both the measured C detector value and the R detector value must be greater than or equal to a predetermined value.

5A is a graph showing changes in light uniformity in the center and side of a tube according to a distance index (D) value in the light emitting device lamp according to the embodiment, and 5B is a position (x, y) of the light emitting device 30 ) Is a graph showing the change in light uniformity at the center and side of the tube according to the tan T value, and FIG. 5c shows the change in light uniformity at the center and side of the tube according to the light emission angle (θ). It is the graph shown.

As shown in FIG. 5A, it can be seen that as the distance index (D) value increases, the light uniformity (Min/Max_C) at the center varies between 0.65 and 0.73, and when the distance index (D) value is greater than 0.73, the side It can be seen that the light uniformity of (Min/Max_R) decreases to 0.65 or less. Meanwhile, as illustrated in FIG. 5B, as the tan T value according to the position of the light emitting device 30 changes, the optical uniformity (Min/Max_C) in the center and the optical uniformity (Min/Max_R) in the side are 0.65 to 0.73. You can see that it changes between. In addition, as illustrated in FIG. 5C, it can be seen that as the value of cos θ according to the emission angle θ of the light emitted from the light emitting device 30 changes, it varies between 0.6 and 0.73. That is, as illustrated in FIGS. 5A to 5C, although the tan T and the emission angle θ according to the position of the light emitting device 30 change, the optical uniformity changes within a certain range, but the distance index D increases. It can be seen that the light uniformity decreases.

6 is a graph showing changes in light uniformity at the center and side of the tube according to the light uniformity determination index in the light emitting device lamp according to the embodiment.

Referring to FIG. 6, it can be seen that as the optical uniformity determination index (L) increases, the optical uniformity (Min/Max_C) in the central portion changes between 0.65 and 0.73, and the optical uniformity determination index (L) is less than 0.5. If it is large, it can be seen that the light uniformity (Min/Max_R) of the side is rapidly decreased to 0.65 or less. That is, it can be seen that when the optical uniformity crystal index is smaller than 0.5, the optical uniformity degree is maintained at 0.65 or more, but when the optical uniformity crystal index is larger than 0.5, the optical uniformity degree is rapidly decreased below 0.65.

Therefore, the light emitting device 30 may be arranged to satisfy the following equation (1).

[Equation 2]

(P / 2) × tan T × cos θ / d <0.5

As shown in Equation 3, in order to maintain the optical uniformity at a predetermined value of 0.65 or more, the optical uniformity determination index should be less than 0.5. Therefore, in the light emitting device lamp 1 according to the embodiment of the present invention, in order to make the optical uniformity determination index smaller than 0.5, the distance index D is adjusted to be smaller than 0.73, or the position or emission angle of the light emitting device 30 ( θ) can be adjusted. In order to reduce the distance index D, as described above, the average distance P may be reduced, or the separation distance d between the light emitting element 30 and the light transmitting unit 10 may be increased.

Meanwhile, the structure 40 of the light emitting device lamp 1 according to the embodiment of the present invention may be disposed adjacent to the circuit board 20 on one side of the light transmitting part 10. Since the light-emitting element lamps 1 according to the embodiment of the present invention are spaced apart from each other, and the light-emitting elements 30 include circuit boards 20a and 20b arranged in a zigzag manner, there is an effect of eliminating a heat radiator. Accordingly, the light emitting device lamp 1 according to the embodiment of the present invention may include a structure 40 made of plastic or glass fiber (GF) material for securing rigidity, not for heat dissipation.

The embodiments have been mainly described above, but this is merely an example and does not limit the present invention, and those of ordinary skill in the art to which the present invention pertains have not been exemplified above in a range not departing from the essential characteristics of the present embodiment. It will be appreciated that various modifications and applications are possible. For example, each component specifically shown in the embodiment can be modified. And differences related to these modifications and applications should be construed as being included in the scope of the invention defined in the appended claims.

1: Light-emitting element lamp
10: floodlight
20: circuit board
30: light emitting element
40: Structure
50: power socket

Claims (10)

A light-transmitting portion extending in a tube shape;
A circuit board including a first substrate and a second substrate disposed on one side of the light transmitting part and spaced apart from each other by a predetermined distance; And
A light emitting element disposed at a predetermined interval on each of the first substrate and the second substrate; Including,
The light emitting element of the first substrate is disposed to correspond between two adjacent light emitting elements disposed on the second substrate, or the light emitting element of the second substrate corresponds between two adjacent light emitting elements disposed on the first substrate It is arranged
The light emitting device is arranged to satisfy the following equation (4),
[Equation 4]
(P / 2) × tan T × cos θ / d <0.5
The P is an average interval between adjacent light emitting elements disposed on each of the first substrate or the second substrate, and d is the direction perpendicular to the center of the top surface of the light emitting element and the top surface of the light emitting element. The distance to the light-transmitting portion, θ is the emission angle between the line segment connecting the center of the upper surface of the light-emitting element and the upper center (C) of the light-emitting element and the normal perpendicular to the center of the upper surface of the light-emitting element, wherein T is A light-emitting element lamp imprinted between a bisector dividing the light-transmitting portion into left and right portions based on the inner center (O) of the light-transmitting portion and a line segment connecting the inner center (O) of the light-transmitting portion to the center of the upper surface of the light-emitting element. delete According to claim 1,
The light emitting device is arranged to satisfy the following equation (3),
[Equation 3]
(P / 2) / d <0.73,
The P is an average interval between two adjacent light emitting elements disposed on each of the first substrate or the second substrate, and d is a direction perpendicular to the center of the top surface of the light emitting element and the top surface of the light emitting element. A light-emitting element lamp, which is a distance to the light transmitting portion. delete According to claim 1,
The first substrate and the second substrate,
Each of the light emitting elements of the first substrate and the light emitted vertically from the light emitting elements of the second substrate has a predetermined slope so as to cross each other in the light transmitting unit,
Light-emitting element lamp. delete delete delete delete delete

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