JP2002329587A - Led lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily provide white luminescence by an easy circuit constitution in an LED lamp and to extremely easily adjust brightness. SOLUTION: This LED lamp 1 is provided with two red light-emitting devices R1 and R2 connected in series, two green light-emitting devices G1 and G2 and a blue light-emitting device B1. Because the five light-emitting devices R1, R2, G1, G2 and B1 are sorted as three light-emitting devices for obtaining white luminescence by the same current value in advance, beautiful white luminescence can be easily obtained by the simple circuitry put with only a resistor 3 for adjusting current therein. When brightness of the LED lamp 1 is changed, a current value I flowing in the five light-emitting devices R1, R2, G1, G2 and B1 connected in series is evenly changed only if adjusting a resistance value Vr of the variable resistor 3, and thereby brightness of the LED lamp 1 can be easily adjusted, keeping white luminescence balance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of light emitting elements and leads and wires for making electrical connections with the light emitting elements are housed in a case made of synthetic resin or the like and sealed with a material such as a transparent epoxy resin having a light transmitting property. The present invention relates to a stopped LED lamp. In this specification, the LED chip itself is referred to as a “light emitting element”, and the entire light emitting device on which a plurality of LED chips are mounted is referred to as an “LED lamp”.

[0002]

2. Description of the Related Art Conventionally, a plurality of light emitting elements are mounted on a synthetic resin case formed by injection molding, electrically connected by wire bonding, and entirely sealed with a transparent epoxy resin or the like. An SMD package type LED lamp is used as a light source for a backlight or the like. An example of such a conventional LED lamp will be described with reference to FIG. FIG. 4 is a circuit diagram showing a circuit configuration of a conventional LED lamp.

As shown in FIG. 4, an LED lamp 21 has a red light emitting element R, a green light emitting element G, and a blue light emitting element B in an opening 22a of a case 22 made of synthetic resin.
The light emitting elements are mounted. Each light emitting element R, G,
B is connected in parallel to an external power supply 24, and each light emitting element R, G, B has a variable resistor 23R, 23G, 2
3B are connected in series. Then, the open / close switch 25 provided in the circuit is closed to close each light emitting element R,
The resistance values Vr _R , Vr _G , V of the respective variable resistors 23R, 23G, 23B are applied while applying the voltage E2 of the external power supply 24 to G, B.
current flows sequentially changing the r _B the light-emitting elements R, G, to B I _R, I _G, adjusting the I _B. In this way, the luminous intensity of each of the light emitting elements R, G, and B is adjusted so that the LED lamp 21 as a whole emits white light.

[0004]

However, in this LED lamp 21, since the luminous intensity of each light emitting element R, G, B is adjusted by separate variable resistors 23R, 23G, 23B, the number of light emitting elements is reduced. And only three variable resistors 23R, 23G, and 23B were adjusted to obtain balanced white light emission. Furthermore, LED lamp 2
When trying to adjust the brightness of 1, the three variable resistors 23R, 23G, and 23B had to be adjusted while keeping the balance, and it was difficult to adjust the brightness.

Accordingly, an object of the present invention is to provide an LED lamp which can easily emit white light with a simpler circuit structure and can easily adjust the brightness.

[0006]

According to a first aspect of the present invention, there is provided an LED lamp in which a plurality of light emitting elements are sealed in a case with a light transmitting material. The elements are all connected in series to an external power supply, and the plurality of light emitting elements are at least one red light emitting element, at least one green light emitting element, and at least one blue light emitting element. There is something.

In the LED lamp having such a configuration, the luminous intensity and chromaticity of the R, G, B, and three color light emitting elements are checked in advance, and when combined, three colors capable of emitting white light with the same current value are obtained. Are selected in advance.
At this time, two colors are used for colors whose luminous intensity is insufficient. Then, a plurality of the selected light emitting elements are all connected in series, and a current adjusting resistor or the like is externally connected in series to connect to an external power supply so that the current can be limited and the current can be changed. As a result, a current of the same magnitude flows through a plurality of light-emitting elements connected in series. However, since light-emitting elements of three colors that can emit white light with the same current value are selected in advance, a simple circuit is used. Beautiful white light emission can be easily obtained with the configuration. Also, when changing the brightness of the LED lamp, by changing the resistance of the current adjustment resistor,
Since the magnitude of the current flowing through each light emitting element uniformly changes while white light emission is kept in balance, the brightness can be easily changed.

In this way, an LED lamp that can easily emit white light with a simpler circuit configuration and can easily adjust the brightness.

The LED lamp according to the second aspect of the present invention
2. The configuration according to claim 1, wherein the plurality of light emitting elements are 2
Red light-emitting elements, two green light-emitting elements, and one blue light-emitting element.

In general, the red light emitting element and the green light emitting element have lower luminance than the blue light emitting element. Therefore, by using two light emitting elements, three colors can be balanced and white light can be obtained with the same current value. It is possible to more easily select the combination of the light emitting elements to be obtained. Further, since the green light emitting element has higher luminous efficiency than the blue light emitting element, it is also suitable for applications requiring greenish white light or applications in which power is to be reduced.

In this way, it is possible to more easily select a combination of light emitting elements capable of obtaining white light emission at the same current value, and to an application requiring greenish white light or an application requiring a small power consumption. Also suitable LED
Become a ramp.

[0012] The LED lamp according to the third aspect of the present invention,
2. The configuration according to claim 1, wherein the plurality of light emitting elements are 2
Red light-emitting elements, one green light-emitting element, and two blue light-emitting elements.

By using two red light-emitting elements and two blue light-emitting elements, it is possible to more easily select a combination of light-emitting elements that can emit white light with the same current value. In addition, since it becomes white light with a slight blue tint with an even heat load balance, it is an LED lamp most suitable for applications requiring white light with blue tint.

In this manner, a combination of light emitting elements that can emit white light with the same current value can be more easily selected, and an LED lamp suitable for applications requiring slightly blued white light can be obtained. .

The LED lamp according to the invention of claim 4 is:
In any one of claims 1 to 3,
It is used as a light source for automobiles.

The normally applied voltage of the GaN-based green light emitting element and the blue light emitting element is about 3V, and the normally applied voltage of the GaAs red light emitting element is about 2V. Therefore, the light emitting device using one of these three color light emitting elements is used.
The voltage of the external power supply required for the ED lamp is about 8V, and 13.8V of the power supply for automobiles can sufficiently cover the voltage.
Further, in the configuration of claim 2 and claim 3, Ga
A total of three N-based green light emitting elements and blue light emitting elements, and GaAs
Since two s-system red light-emitting elements are used, the normally applied voltage is 3 (V) × 3 + 2 (V) × 2 = 13 (V)
Is approximately 13 V, which is very close to the voltage of the vehicle power supply of 13.8 V. Therefore, the resistance value of the current adjusting resistor can be small, and it becomes very easy to use as a vehicle light source.

In this way, when used as an automobile light source, the LED lamp is adapted to the voltage of the automobile power supply and is very easy to use as an automobile light source.

An LED lamp according to the invention of claim 5 is:
11 LED lamps according to claim 2 or 3 are connected in series.

As described above, L of claim 2 or claim 3
The voltage normally applied to the five light emitting elements of the ED lamp is about 13V. On the other hand, the voltage of the household AC power supply is 100 V, and the effective voltage when this is rectified and converted to DC is √2 times the value, that is, 141.4 V. Therefore, the normally applied voltage (13V × 1) when 11 LED lamps according to claim 2 or claim 3 are connected in series.
1 =) very close to 143V. Therefore, by rectifying a household AC power supply with a rectifier and using it as a 141.4 V DC power supply, the LED according to claim 2 or 3 is obtained.
An LED lamp in which eleven lamps are connected in series can be used as a household light fixture for white light emission that replaces a conventional light fixture such as an incandescent light bulb or a fluorescent lamp. Furthermore, if the current can be adjusted, the brightness can be easily adjusted.

In this way, an LED lamp having a simple structure can be used as a white light-emitting home lighting device that can replace a conventional lighting device such as an incandescent light bulb or a fluorescent lamp.

[0021]

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

First Embodiment First, a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is an LED according to the first embodiment of the present invention.
FIG. 2 is a circuit diagram illustrating a circuit configuration of a lamp.

As shown in FIG. 1, the LED lamp 1 according to the first embodiment includes a red light emitting element R1, a green light emitting element G1, and a blue light emitting element in an opening 2a of a case (package) 2 made of synthetic resin. Light emitting element B1, green light emitting element G
2. Each of the red light emitting elements R2 is mounted and sealed with a transparent epoxy resin. That is, the LED lamp 1 includes two red light-emitting elements, two green light-emitting elements, and one blue light-emitting element. These five light emitting elements are all connected in series, and the variable resistor 3
Connected to a vehicle battery 4 as an external power supply or a constant current power supply, and an open / close switch 5 for turning on / off the LED lamp 1 is incorporated in this circuit. . L of the first embodiment
The ED lamp 1 includes a lamp unit 1a including five light emitting elements R1, R2, G1, G2, and B1 incorporated in a case 2.
It is composed of

Here, the GaAs red light emitting element R1,
The normally applied voltage of R2 is about 2V, and the normally applied voltage of the GaN-based green light emitting elements G1 and G2 and the blue light emitting element B1 is about 3V. Therefore, when these five light emitting elements R1, R2, G1, G2, and B1 are connected in series, the sum of the normally applied voltages is 2 (V) × 2 +
It becomes about 13 V when 3 (V) × 3 = 13 (V). On the other hand, the voltage of the vehicle battery 4 is E = 13.8 V, and the voltage values of both are very close. Therefore, the LED lamp 1 is a light source that is extremely suitable as a light source for automobiles such as an interior lamp.

In practice, the voltage applied to the GaN-based light-emitting element may be 2.8 V or 3.3 V, for example, depending on the variation in the characteristics of the individual light-emitting elements. Since the influence of the variation is absorbed by the vessel 3, there is no problem in practical use.

The five light emitting elements R1, R
2, G1, G2, and B1 are previously selected as light emitting elements of three colors that can emit white light with the same current value.
Beautiful white light emission can be easily obtained with a simple circuit configuration in which only one current adjusting resistor 3 is inserted. Also, in general,
The red light emitting elements R1 and R2 and the green light emitting elements G1 and G2 are
Since the luminance is lower than that of the blue light-emitting element B1, by using two light-emitting elements each, three colors can be balanced and a combination of light-emitting elements that can emit white light with the same current value can be more easily selected.

Therefore, by closing the open / close switch 5, these five light-emitting elements R connected in series are connected.
A current I of the same magnitude flows through 1, R2, G1, G2, and B1, and the LED lamp 1 emits white light. And LE
When the brightness of the D lamp 1 is to be changed, only the resistance value Vr of the variable resistor 3 is adjusted to flow through the five serially connected light emitting elements R1, R2, G1, G2, and B1. Since the current value I changes uniformly, the brightness of the LED lamp 1 can be easily adjusted while maintaining the balance of white light emission.

Thus, the LED of the first embodiment is
In the lamp 1, white light emission can be easily obtained with a simpler circuit configuration, brightness can be adjusted very easily, and the lamp 1 is extremely suitable as a light source for automobiles.

In the LED lamp 1 according to the first embodiment, since two green light emitting elements G1 and G2 and one blue light emitting element B1 are used, white light with a slightly greenish color is radiated as a whole. You. Further, the green light emitting element has higher luminous efficiency than the blue light emitting element, which leads to lower power consumption. On the other hand, when blueish white light is required, the green light-emitting element G1 is mounted at the center using two blue light-emitting elements B1 and B2 and one green light-emitting element G1, The blue light emitting elements B1 and B2 may be mounted on both sides.

In the LED lamp 1 according to the first embodiment, the variable resistor 3 is used as a current adjusting resistor. However, instead of the variable resistor 3, an ordinary resistor having a constant resistance value is used. May be used. Alternatively, a constant current power supply or a variable constant current power supply may be used.

Further, the LED lamp 1 of the first embodiment
In the above, an example of using a transparent epoxy resin as a light transmitting material as a sealing material has been described, but in addition to the transparent silicon resin, fluidity before curing,
Any light-transmitting material may be used as long as it satisfies conditions such as filling properties, transparency after curing, and strength.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a circuit diagram showing a circuit configuration of the LED lamp according to the second embodiment of the present invention. FIG. 3 is a circuit diagram showing a circuit configuration of a modification of the LED lamp according to the second embodiment of the present invention.

As shown in FIG. 2, the LED lamp 11 according to the second embodiment is configured by connecting 11 LED lamps 1 according to the first embodiment in series. The eleven lamp portions 1a are housed in a case 12 made of a synthetic resin. The LED lamp 11 is connected to a circuit in which a 100 V household AC power supply 14, a diode 16 as a rectifier, and an open / close switch 15 for turning on / off the LED lamp 11 are incorporated.

Here, as described above, the five light emitting elements R1, R2, G1, G2,
The voltage normally applied to B1 is about 13V. On the other hand, the voltage of the household AC power supply 14 is 100 V, and the effective voltage when this is rectified and converted to DC is $ 2.
Double, ie, 141.4V. Therefore, the lamp unit 1
a is very close to the normally applied voltage (13 V × 11 =) of 143 V when 11 are connected in series. Therefore, the household AC power supply 14 is rectified by the rectifier 16 to
When used as a 1.4 V DC power supply, when the on / off switch 15 is closed, the eleven lamp units 1a emit white light at the same time.

As a result, the LED lamp 1 having eleven lamp portions 1a connected in series and one variable resistor 13 inserted therein
1 can be used as a household lighting device in place of a lighting device such as a conventional incandescent lamp or fluorescent lamp. further,
By adjusting the resistance value of the variable resistor 13, adjustment of brightness can be easily performed. In the LED lamp 11 of the second embodiment, 11 light-emitting elements of the lamp section 1a, that is, 55 light-emitting elements
Only the variable resistors 13 are used, and a white light-emitting household lighting device is realized with an extremely simple configuration.

As described above, the LED of the second embodiment
The lamp 11 can be used as a white light-emitting home lighting device that replaces a conventional lighting device such as an incandescent light bulb or a fluorescent lamp with a very simple configuration.

In the LED lamp 11 of the second embodiment, the variable resistor 13 is used as a current adjusting resistor. However, instead of the variable resistor 13, a normal resistor having a constant resistance value is used. Is also good. However, in this case, the LED
When trying to change the brightness of the lamp, a variable constant current power supply may be used.

As shown in a modification of FIG. 3, a diode bridge 17 can be used for rectifying the AC power supply 14.

Further, in each of the above embodiments, an example in which a synthetic resin is used as a case material has been described.
Various other materials such as metal can be used as the case material.

The configuration, shape, quantity, material, size, connection relationship, and the like of the other parts of the LED lamp are not limited to the above embodiments.

[0041]

As described above, the LED lamp according to the first aspect of the present invention is an LED lamp in which a plurality of light emitting elements are sealed in a case with a light transmitting material. Are all connected in series to an external power supply, and the plurality of light emitting elements are at least one.
Red light-emitting elements, at least one green light-emitting element, and at least one blue light-emitting element.

In the LED lamp having such a configuration, the luminous intensity and chromaticity of the R, G, B, and three color light emitting elements are checked in advance, and when combined, three colors capable of emitting white light with the same current value are obtained. Are selected in advance.
At this time, two colors are used for colors whose luminous intensity is insufficient. Then, the selected light emitting elements are all connected in series and connected to an external power supply. As a result, a current of the same magnitude flows through a plurality of light-emitting elements connected in series, but white light is previously obtained with the same current value.
Since the color light emitting elements are selected, beautiful white light emission can be easily obtained with a simple circuit configuration including only one current adjusting resistor. Also, when changing the brightness of the LED lamp, change the resistance of the current adjusting resistor,
Alternatively, by changing the current setting of the variable constant current power supply, the magnitude of the current flowing through each light emitting element uniformly changes while white light emission is balanced, so that the brightness can be easily changed.

Thus, an LED lamp that can easily emit white light with a simpler circuit configuration and can easily adjust the brightness.

The LED lamp according to the invention of claim 2 is:
2. The configuration according to claim 1, wherein the plurality of light emitting elements are 2
Red light-emitting elements, two green light-emitting elements, and one blue light-emitting element.

Generally, the red light emitting element and the green light emitting element have lower luminance than the blue light emitting element.
In addition to the effects described in, 3
It is possible to more easily select a combination of light-emitting elements that can achieve white light emission with the same current value while maintaining color balance. Further, since the green light emitting element has higher luminous efficiency than the blue light emitting element, it is also suitable for applications requiring greenish white light or applications in which power is to be reduced.

In this way, it is possible to more easily select a combination of light-emitting elements that can emit white light with the same current value, and to use green light white light or reduce power consumption. Also suitable LED
Become a ramp.

The LED lamp according to the third aspect of the present invention
2. The configuration according to claim 1, wherein the plurality of light emitting elements are 2
Red light-emitting elements, one green light-emitting element, and two blue light-emitting elements.

By using two red light-emitting elements and two blue light-emitting elements, it is possible to more easily select a combination of light-emitting elements that can emit white light with the same current value, in addition to the effect described in claim 1. it can. In addition, since it becomes white light with a slight blue tint with an even heat load balance, it is an LED lamp most suitable for applications requiring white light with blue tint.

In this way, a combination of light emitting elements that can emit white light with the same current value can be more easily selected, and an LED lamp suitable for applications requiring slightly blued white light can be obtained. .

The LED lamp according to the invention of claim 4 is:
In any one of claims 1 to 3,
It is used as a light source for automobiles.

In addition to the effects described in any one of claims 1 to 3, a GaN-based green light-emitting element and a blue light-emitting element normally have a voltage of about 3 V and a GaAs-based red light-emitting element. The device is typically applied with a voltage of about 2V.
Therefore, the voltage of the external power supply required for an LED lamp using one of these three color light emitting elements is about 8V, and 13.8V of the power supply for automobiles can sufficiently cover the voltage. Furthermore, in the configurations of claims 2 and 3, since a total of three GaN-based green light-emitting elements and three blue-light-emitting elements and two GaAs-based red light-emitting elements are used, a normally applied voltage is used. Is 3 (V) × 3 + 2 (V) × 2
= 13 (V), it becomes about 13V.
Since the voltage is very close to 3.8 V, the resistance value of the current adjusting resistor can be small, which makes it very easy to use as an automobile light source.

In this way, when used as a light source for an automobile, the LED lamp is adapted to the voltage of the power supply for the automobile, and is very easy to use as a light source for an automobile.

The LED lamp according to the invention of claim 5 is:
11 LED lamps according to claim 2 or 3 are connected in series.

As described above, L of claim 2 or claim 3
The voltage normally applied to the five light emitting elements of the ED lamp is about 13V. On the other hand, the voltage of the household AC power supply is 100 V, and the effective voltage when this is rectified and converted to DC is √2 times the value, that is, 141.4 V. Therefore, the normally applied voltage (13V × 1) when 11 LED lamps according to claim 2 or claim 3 are connected in series.
1 =) very close to 143V. Therefore, by rectifying a household AC power supply with a rectifier and using it as a 141.4 V DC power supply, the LED according to claim 2 or 3 is obtained.
An LED lamp in which eleven lamps are connected in series can be used as a household light fixture for white light emission that replaces a conventional light fixture such as an incandescent light bulb or a fluorescent lamp. In addition, 1
If the current adjusting resistors are variable resistors, brightness adjustment can be easily performed.

In this way, an LED lamp having a simple configuration can be used as a white light-emitting home lighting device that replaces conventional lighting devices such as incandescent lamps and fluorescent lamps.

[Brief description of the drawings]

FIG. 1 is an LED according to a first embodiment of the present invention;
FIG. 2 is a circuit diagram illustrating a circuit configuration of a lamp.

FIG. 2 is an LED according to a second embodiment of the present invention;
FIG. 2 is a circuit diagram illustrating a circuit configuration of a lamp.

FIG. 3 is an LED according to a second embodiment of the present invention;
FIG. 9 is a circuit diagram illustrating a circuit configuration of a modified example of the lamp.

FIG. 4 is a circuit diagram showing a circuit configuration of a conventional LED lamp.

[Explanation of symbols]

 1,11 LED lamp 2,12 case 4,14 External power supply B1 Blue light emitting element G1, G2 Green light emitting element R1, R2 Red light emitting element

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3K073 AA16 AA53 AA75 AA83 AB01 AB04 CG46 CJ17 CJ19 3K098 CC00 CC41 CC44 CC51 CC56 DD01 DD15 DD32 EE18 EE33 5F041 AA11 BB22 DA14 DA44 FF11 FF16

Claims (5)

[Claims] 1. An LED lamp in which a plurality of light emitting elements are sealed in a case with a light transmissive material, wherein the plurality of light emitting elements are all connected in series to an external power supply. The plurality of light emitting elements includes at least one red light emitting element, at least one green light emitting element, and at least one green light emitting element;
An LED lamp comprising: blue light emitting elements. 2. The LED lamp according to claim 1, wherein the plurality of light emitting elements are two red light emitting elements, two green light emitting elements, and one blue light emitting element. . 3. The LED lamp according to claim 1, wherein the plurality of light emitting elements are two red light emitting elements, one green light emitting element, and two blue light emitting elements. . 4. The LED lamp according to claim 1, wherein the LED lamp is used as a light source for an automobile. 5. An LED lamp comprising 11 LED lamps according to claim 2 or 3 connected in series.