KR20080077770A - Light instruments - Google Patents

Abstract

A lighting apparatus is provided to obtain the optimum color temperature simply by driving an auxiliary light device with a switching control method. A lighting apparatus includes a light source(18), a sensor unit, and a control unit. The light source has a white light device and an auxiliary light device. The white light device is composed of a single blue light emitting element(18b) and a phosphor. The auxiliary light device is composed of an auxiliary red light emitting element(18a) and an auxiliary blue light emitting element(18c) around the blue light emitting element. The sensor unit senses a surrounding environment state. The control unit controls turn-on/off of the light source according to a sensing signal of the sensor unit.

Description

Light instruments

1 is a view showing the configuration of a lighting device according to an embodiment of the present invention.

2 is a view showing an installation state of the light source shown in FIG.

3 is a diagram illustrating an example in which the LED package shown in FIG. 2 is employed.

4 is a diagram illustrating an example of color temperature adjustment in color coordinates by the lighting apparatus according to the embodiment of the present invention.

FIG. 5 is an enlarged view of "K" in FIG. 4.

<Description of Symbols for Major Parts of Drawings>

10: temperature sensor 12: humidity sensor

14 button 16 memory

18: light source 20: switching unit

22: microcomputer 24: phosphor

The present invention relates to a luminaire, and more particularly, to a luminaire for easily adjusting the color temperature according to the surrounding environment.

The lighting fixtures are classified according to the light source, and there are mercury lamps, sodium lamps, and LED lamps.

Mercury lamps consume less power and are about three times more efficient than incandescent bulbs. Mercury lamps have the disadvantage of poor color implementation and low luminous flux associated with blue.

The sodium lamp is a high-purity discharge lamp using a special ceramic tube in the light emitting tube and encapsulating xenon gas in addition to sodium inside, and emits some red light at a color temperature of about 2100 ° K. Sodium lamps are twice as efficient as mercury lamps, and are used for road lighting, high ceiling factory lighting, and stadiums. Sodium lamps are reddish yellow in color, which is not good for the human body because of disability and fatigue.

LED lamps have been widely used in recent years because they can freely size and shape compared to mercury lamps and sodium lamps, can freely express colors, and are environmentally friendly.

As described above, lighting devices such as street lamps or indoor lamps using LEDs as light sources realize white light by combining red LEDs, green LEDs, and blue LEDs.

In recent years, measurements have been proposed that the visible part of the electromagnetic spectrum provides a physiological effect to the human body, and adjustment of color temperature using LEDs and the like has been attempted.

If you want to adjust the color temperature using the LED lamp, the user manually controls the driving current amount of each of the red LED, the green LED, and the blue LED. Since the user performs dimming by hand, it is not easy to control the amount of current to achieve a desired color temperature. As a result, the optimum color temperature corresponding to the surrounding environment may not be achieved. In particular, a dimming controller and a dimming ballast that adjusts the output according to the control of the dimming controller are required for each LED in connection with the dimming operation.

In order to realize white light without using a phosphor, the installation form of the red LED, the green LED, and the blue LED is very important. In other words, the LED lamp should basically implement white light. If an error occurs in the interval and arrangement between the red LED, the green LED, and the blue LED, the white light may not be properly implemented.

The present invention has been proposed to solve the above-mentioned conventional problems, and an object thereof is to provide a luminaire for easily adjusting the color temperature according to the surrounding environment by a simple configuration.

In order to achieve the above object, a lighting device according to a preferred embodiment of the present invention is a lighting device having a packaged light source,

The light source is composed of a white light means and an auxiliary light means, the white light means is composed of a single blue light emitting element and a phosphor, and the auxiliary light means is composed of an auxiliary red light emitting element and an auxiliary blue light emitting element provided around the single blue light emitting element. .

A lighting device according to another embodiment of the present invention, a light source composed of white light means and auxiliary light means; Sensor unit for detecting the state of the surrounding environment; And a control unit for controlling the turning on and off of the light source based on the detection signal from the sensor unit, wherein the white light means is composed of a single blue light emitting element and a phosphor, and the auxiliary light means is installed around the single blue light emitting element. It consists of an auxiliary red light emitting element and an auxiliary blue light emitting element.

The sensor unit includes a temperature sensor for detecting an ambient temperature and a humidity sensor for detecting an ambient humidity.

The controller turns on the white light means when the detection signal from the temperature sensor is within a preset reference range.

The controller turns on the white light means and the auxiliary red light emitting element when the detection signal from the temperature sensor is less than the preset reference range.

The controller turns on the white light means and the auxiliary blue light emitting element when the detection signal from the temperature sensor exceeds the preset reference range.

The controller turns on the white light means and the auxiliary red light emitting element when the detection signal from the humidity sensor is equal to or greater than a predetermined reference value.

The auxiliary light means may further include an auxiliary green light emitting element.

Hereinafter, a lighting device according to an embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a view showing the configuration of a lighting device according to an embodiment of the present invention. And a temperature sensor 10, a humidity sensor 12, a button 14, a memory 16, a light source 18, a switching unit 20, and a microcomputer 22.

The temperature sensor 10 detects the ambient temperature of the luminaire. Humidity sensor 12 detects the ambient humidity of the luminaire.

The button 14 is a button for commanding power ON / OFF of the corresponding lighting fixture. Typically, the button 14 may be in the form of a push button or may be in the form of a slide button. The button 14 may be installed for each luminaire, and if the luminaire is connected to and controlled remotely, the button 14 does not need to be installed for each luminaire.

The memory 16 stores reference information compared with signals detected by the temperature sensor 10 and the humidity sensor 12 and subsequent response information according to the reference information. For example, if the detection signal from the temperature sensor 10 is within a reference range (for example, 0 ° C. to 25 ° C.), turn on the white light means to be described later to adjust the color temperature to approximately 4500 ° K to 6500 ° K. Information is stored in the memory 16. If the detection signal from the temperature sensor 10 is less than the reference range (for example, less than 0 ° C.), the memory 16 may turn on the white light means and the auxiliary red light emitting element to be described later to adjust the color temperature to approximately 4000 ° K or less. ) When the detection signal from the temperature sensor 10 exceeds the reference range (for example, more than 25 ° C.), the memory 16 informs the user to turn on the white light means and the auxiliary blue light emitting element to be described later in order to adjust the color temperature to 10000 ° K or more. ) If the detection signal from the humidity sensor 12 is equal to or greater than a reference value (for example, humidity of 60%), information for turning on the white light means and the auxiliary red light emitting element to be described later is stored in the memory 16.

The light source 18 is composed of white light means for outputting white light and auxiliary light means for auxiliary light emission of red or blue. The white light means is composed of a single blue light emitting element 18b and a phosphor (not shown). The auxiliary light means is composed of an auxiliary red light emitting element 18a and an auxiliary blue light emitting element 18c provided around the single blue light emitting element 18b. The light emitting elements 18a, 18b, and 18c are preferably composed of LEDs to provide freedom of color implementation.

The light source 18 is employed in a semiconductor package as illustrated in FIG. The semiconductor package of FIG. 2 may be regarded as all SMD type packages such as ceramic packages, plastic packages, lead frame type packages, and plastic + lead frame type packages. The blue light emitting element 18b, the auxiliary red light emitting element 18a, and the auxiliary blue light emitting element 18c are mounted in the mounting region of the cavity of the semiconductor package illustrated in FIG. Phosphor 24 is filled in the cavity and covers the light emitting elements 18a, 18b, and 18c. The amount of the phosphor 24 used is adjusted so that the light emitted from the blue light emitting element 18b can pass through the phosphor 24 to express white light.

Basically, in the present invention, the white light is realized by one blue light emitting element 18b and the phosphor 24 having a predetermined thickness. That is, the light emitting elements 18a and 18c are auxiliaryly selected and emit light according to the surrounding situation in order to provide a change in color temperature. Therefore, the amount of current supplied to the blue light emitting element 18b does not need to be equal to the amount of current provided to the light emitting elements 18a, 18b, and 18c. The auxiliary red light emitting element 18a and the auxiliary blue light emitting element 18c do not need to be the same. Larger than The auxiliary red light emitting device 18a and the auxiliary blue light emitting device 18c use LEDs that are less expensive than the blue light emitting device 18b. When the white light can be realized by the color mixture by the blue light emitting device 18b and the phosphor 24, and the auxiliary red light emitting device 18a and the auxiliary blue light emitting device 18c can play a desired auxiliary role in the present invention, blue light emission The element 18b, the auxiliary red light emitting element 18a, and the auxiliary blue light emitting element 18c may be arranged differently from those illustrated in FIG.

If the blue light emitting element 18b and the auxiliary red light emitting element 18a emit light, the light passing through the phosphor 24 has a warm feeling. When the blue light emitting element 18b and the auxiliary blue light emitting element 18c emit light, the light passing through the phosphor 24 has a cool feeling.

As shown in FIG. 2, the blue light emitting element 18b, the auxiliary red light emitting element 18a, and the auxiliary blue light emitting element 18c are provided in one semiconductor package, and a lens (not shown) is provided on the upper surface of the phosphor 24. It may be formed. 3 shows that a plurality of semiconductor packages 30 having light sources 18 are installed. The plurality of semiconductor packages 30 of FIG. 3 are installed downward from the case 32.

In the above-described embodiment of the present invention, the auxiliary red light emitting device 18a and the auxiliary blue light emitting device 18c are used as auxiliary light means, but an auxiliary green light emitting device (not shown) may be added as necessary. When the auxiliary green light emitting device (LED) is added and used, the type of preset reference information may be more diversified, and the type of color temperature may be more diverse.

In FIG. 2, three light emitting devices 18a, 18b, and 18c are provided in one semiconductor package, but the red light emitting device 18a and the blue light emitting device 18c used as auxiliary light means in one semiconductor package are described. You may install more. This makes it possible to vary the level of color temperature according to the surrounding conditions (temperature, humidity).

3, since a plurality of semiconductor packages 30 are arranged, the level of color temperature is varied by turning on or off the light emitting elements in the plurality of semiconductor packages 30 without additional auxiliary light means being provided in each semiconductor package. It can be done.

The temperature sensor 10 and the humidity sensor 12 may be installed on the upper surface of the case 32 shown in FIG. 3 or may be installed on the support 34. The temperature sensor 10 and the humidity sensor 12 are waterproofed to be protected from water or moisture.

In FIG. 1, the switching unit 20 turns on or off the blue light emitting device 18b, the auxiliary red light emitting device 18a, and the auxiliary blue light emitting device 18c according to the control signal of the microcomputer 22. The switching unit 20 turns on (ON) or turns off (OFF) the blue light emitting element 18b based on the on / off signal from the microcomputer 22 and the microcomputer 22. Transistor Q1 for turning on or off the auxiliary red light emitting element 18a based on the on / off signal from the &lt; RTI ID = 0.0 &gt; 1) &lt; / RTI &gt; and the auxiliary blue light emitting element 18c on the basis of the on / off signal from the microcomputer 22. Or transistor Q3 to be extinguished. The implementation of the switching unit 20 with a transistor is only one example, and the switching unit 20 does not have to be configured only with a transistor. Any type of switching element may be used as long as the switching element can turn on / off the light emitting elements 18a, 18b, and 18c.

In FIG. 1, the microcomputer 22 controls the overall operation of the lighting device. The microcomputer 22 may be regarded as the controller described in the claims of the present invention.

The memory 16 and the switching unit 20 shown in FIG. 1 may be provided inside the microcomputer 22.

Next, the operation of the lighting device according to the embodiment of the present invention will be described. In the following description, it is assumed that the lighting fixture is a street lamp that does not require the button 14.

Typically, when the initial power is supplied to the street lamp, the microcomputer 22 in the street lamp drives the white light means. That is, the microcomputer 22 turns on the transistor Q2 of the switching unit 20 to turn on the blue light emitting element 18b. Accordingly, the light emitted from the blue light emitting element 18b passes through the phosphor 24 to output white light.

Then, the temperature sensor 10 detects the temperature around the street lamp and sends it to the microcomputer 22, and the humidity sensor 12 detects the humidity around the street lamp and sends it to the microcomputer 22.

The microcomputer 22 compares the input temperature sensing signal and the humidity sensing signal with reference information preset in the memory 16.

As a result of the comparison, when the detection signal from the temperature sensor 10 is within a preset reference range (eg, 0 ° C. to 25 ° C.), the microcomputer 22 continuously operates only white light means to output white light. When white light is output, the color temperature is about 4500 ° K to 6500 ° K.

As a result of the comparison, if the detection signal from the temperature sensor 10 is less than the predetermined reference range (for example, less than 0 ° C.), the microcomputer 22 controls the switching unit 20 to control the white light means and the auxiliary red light emitting device 18a. Lights up. That is, since the white light means is already in operation, the auxiliary red light emitting element 18a is additionally turned on as it is. In this way, red light is mixed with white light, and a light (color temperature of about 4000 ° K or less) having a warm feeling is output. As a result, the people around the streetlights feel warm.

As a result of the comparison, when the detection signal from the temperature sensor 10 exceeds the preset reference range (for example, exceeding 25 ° C.), the microcomputer 22 controls the switching unit 20 so that the white light means and the auxiliary blue light emitting device 18c may be used. ) Lights up. That is, since the white light means is already operating, the auxiliary blue light emitting element 18c is additionally turned on as it is. In this case, blue light is mixed with white light, and light having a cool feeling (color temperature of approximately 10000 ° K or more) is output. As a result, the person around the streetlight feels cool.

On the other hand, if the detection signal from the humidity sensor 12 is greater than or equal to a predetermined reference value (for example, humidity of 60%), the microcomputer 22 controls the switching unit 20 to turn on the white light means and the auxiliary red light emitting element 18a. . That is, since the white light means is already in operation, the auxiliary red light emitting element 18a is additionally turned on as it is. In this way, the light of the red system has good transparency, which is advantageous when fog occurs.

4 is a view showing an example of the color temperature adjustment in the color coordinates by the lighting fixture according to an embodiment of the present invention, Figure 5 is an enlarged view of "K" in FIG.

As can be seen in Figures 4 and 5, the color temperature range of the white light outputting the luminaire (for example, LED, etc.) according to an embodiment of the present invention is "m" (color temperature is approximately 4500 ° K ~ 6500 ° K) . In this state, when white light is mixed with red color and light of warm color (color temperature is about 4000 ° K or less) is output, it moves to the color temperature area of "b", and blue color is mixed with white light to feel cool. When the colored light (color temperature is about 10000 K or more) is outputted, it moves to the color temperature area of "a". Of course, even when there is a lot of humidity due to fog or the like, it moves to the color temperature range of "b". In the above description, the three light emitting elements (that is, the blue light emitting element 18b, the auxiliary red light emitting element 18a, and the auxiliary blue light emitting element 18c) pass through the phosphor 24 when the light is turned on according to the surrounding conditions. The color temperature of light is described. As shown in FIG. 3, when the plurality of semiconductor packages 30 are enlarged, the color temperature region may be changed in various ways.

In Fig. 5, "c" is a color temperature region of mercury lamp, and "d" is a color temperature region of sodium lamp.

The present invention is not limited only to the above-described embodiments, but may be modified and modified without departing from the scope of the present invention, and the technical spirit to which such modifications and variations are applied should also be regarded as belonging to the following claims. .

As described in detail above, according to the present invention, by using one blue light emitting device and a phosphor for implementing white light, the white light is easily implemented as compared with the conventional red, green, and blue light emitting devices.

Conventionally, the present invention attempts to obtain a desired color temperature by controlling the amount of current of the red light emitting device, the green light emitting device, and the blue light emitting device, respectively (ie, by the dimming method), but the present invention is very easily optimized by driving the auxiliary light means by the switching control method. The color temperature of can be obtained.

Compared with the conventional mercury lamp and sodium lamp it is very useful to be able to emit the optimum light according to various conditions.

The auxiliary light means operates with a smaller amount of current than the white light means, and the light emitting element itself can be driven at a lower power than mercury lamps and sodium lamps, thereby reducing power consumption.

Claims (6)

A luminaire with a packaged light source, The light source is composed of white light means and auxiliary light means, And the white light means comprises a single blue light emitting element and a phosphor, and the auxiliary light means comprises an auxiliary red light emitting element and an auxiliary blue light emitting element installed around the single blue light emitting element. As a luminaire, A light source composed of white light means and auxiliary light means; Sensor unit for detecting the state of the surrounding environment; And A control unit for controlling the lighting and turning off of the light source based on the detection signal from the sensor unit, And the white light means comprises a single blue light emitting element and a phosphor, and the auxiliary light means comprises an auxiliary red light emitting element and an auxiliary blue light emitting element installed around the single blue light emitting element. The method according to claim 2, The sensor unit is composed of a temperature sensor for sensing the ambient temperature, The control unit turns on the white light means when the detection signal from the temperature sensor is within a preset reference range, and turns on the white light means and the auxiliary red light emitting element when the detection signal from the temperature sensor is below a preset reference range. And turning on the white light means and the auxiliary blue light emitting element when the detection signal from the temperature sensor exceeds a preset reference range. The method according to claim 2, The sensor unit is composed of a humidity sensor for detecting the ambient humidity, And the control unit turns on the white light means and the auxiliary red light emitting element when the detection signal from the humidity sensor is equal to or greater than a predetermined reference value. The method according to claim 1 or 2, The auxiliary light means further comprises an auxiliary green light emitting device. The method according to claim 1 or 2, The blue light emitting device, the auxiliary red light emitting device and the auxiliary blue light emitting device is characterized in that consisting of a light emitting diode.

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