JP2008039354A - Refrigerator lighting device - Google Patents

Abstract

When a light emitting diode emitting a wavelength in the visible light region is used as interior lighting of a refrigerator or the like, a current limiting resistor of the light emitting diode is provided on a control board for controlling the operation of the refrigerator. The temperature rise of the control board is large and the size of the control board becomes large, or a cooling device must be provided on the control board.
A refrigerator comprising: an LED board 1 mounted with a light emitting diode 2 as interior lighting and a control board 19 which is located outside the box and supplies voltage to the LED board 1 according to the operating state of the refrigerator. In the lighting device 20, the current limiting resistor that limits the current to the light emitting diode 2 is divided and mounted on each of the LED board and the control board, whereby the heat generation load of the current limiting resistor is applied to the LED board 1 and the control board 19. The thermal design margin of each substrate can be improved by dispersing.
[Selection] Figure 4

Description

  The present invention relates to a lighting device used for a refrigerator.

  In recent years, as a lighting device in a refrigerator, a device using a semiconductor issue element has been proposed for reasons such as low heat generation, no infrared wavelength, and low voltage driving, instead of conventional incandescent lamps and light bulbs.

  As a refrigerator using a conventional light-emitting diode as a lighting device, there is a refrigerator in which a plurality of light-emitting diodes are arranged in a square shape and installed on the top surface of the interior to irradiate the interior (for example, see Patent Document 1).

  FIG. 5 is a perspective view of a lighting device for a conventional ice making machine described in Patent Document 1, and FIG. 6 is a conceptual diagram in which the lighting device of FIG. 5 is installed on the top surface of the ice making machine.

  The LED substrate 101 on which the light emitting diode (white LED) 102 which is the lighting device of FIG. 5 is mounted is flat and has a width of 100 mm × a depth of 100 mm, and a circuit pattern (not shown) is formed on one or both sides, and is thermally conductive. It is a good epoxy resin substrate or insulating metal substrate. The white LEDs 102 are formed in a cannonball shape, and are structured to obtain white light by exciting the fluorescent material using the blue light from the GaN-based blue LED. Has been.

  In FIG. 6, the LED substrate 101 of the lighting device is disposed on the top surface 42 in the refrigerator of the ice making machine 41.

  The operation of the refrigerator using the light emitting diode configured as described above as a lighting device will be described below.

First, when the door of the refrigerator is closed, it is detected that the door is closed, the voltage is not supplied from the control board (not shown) to the light emitting diode 102, and the interior is not irradiated. When the door is opened, an electronic switch such as a mechanical switch or a Hall IC determines that the door is open, voltage is supplied from the control board to the light emitting diode 102, white light is emitted, and the interior is irradiated. .
JP 2001-82869 A

  However, in the above conventional configuration, since there is no resistor for limiting the current of the light emitting diode on the mounting board of the lighting device and the resistor is provided on the control board, the temperature rise on the control board is large and the control board size is large. It is necessary to increase the size or provide a cooling device for the control board.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a lighting device that can reduce a heat generation load on a control board by disposing a resistor on a mounting board of the lighting device. And

  In order to solve the above-described conventional problems, a lighting device for a refrigerator according to the present invention is located inside a cabinet, and an LED substrate on which a light emitting diode is mounted as interior lighting, and the LED located outside the cabinet depending on the operating state of the refrigerator. In a refrigerator lighting device including a control board for supplying a voltage to a board, a current limiting resistor for limiting a current to the light emitting diode is divided into two or more, and at least one of the current limiting resistors is the LED board It is implemented above.

  As a result, the heat generation load on the control board can be reduced. In addition, condensation and sweating of the LED substrate used in the refrigerator can be prevented, and a protection function against static electricity of the LED substrate alone can be provided.

  The refrigerator lighting device of the present invention is provided on a control board that supplies a voltage to the LED board according to the operating state of the refrigerator by providing a current limiting resistor that limits the current to the light emitting diode on the LED board on which the light emitting diode is mounted. Heat generation load can be reduced, and condensation and sweating of the LED substrate of the lighting device used in the refrigerator can be prevented.

  The invention according to claim 1 is comprised of an LED board that is located inside the cabinet and mounted with a light emitting diode as interior lighting, and a control board that is located outside the cabinet and supplies voltage to the LED board according to the operating state of the refrigerator. In a lighting device of a refrigerator, a current limiting resistor for limiting a current to the light emitting diode is divided into two or more, and at least one of the current limiting resistors is mounted on the LED substrate, thereby The design load of the control board can be improved. Moreover, while being able to prevent the dew condensation and sweating of the illuminating device used in a refrigerator warehouse, the protection function with respect to the static electricity of a LED board single-piece | unit can be provided.

  The invention according to claim 2 is the invention according to claim 1, wherein the current limiting resistor is mounted on the LED board and the control board, respectively, so that the heat generation load of the current limiting resistor is applied to the LED board and the control board. Therefore, the thermal design margin of each substrate can be improved.

  According to a third aspect of the present invention, in the invention of the second aspect, the current limiting resistor is mounted on the LED substrate with the larger limit value, so that heat is generated on the LED substrate as a lighting device in the refrigerator. The amount can be increased, and condensation and sweating on the LED substrate in the refrigerator can be further suppressed.

  According to a fourth aspect of the present invention, in the invention of the second aspect, the current limiting resistor is mounted on the LED substrate with the smaller limit value, so that heat is generated on the LED substrate as a lighting device in the refrigerator. A quantity can be made small and the temperature rise in a refrigerator can be suppressed.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same reference numerals are given to the same configurations as those of the conventional example or the embodiments described above, and detailed descriptions thereof will be omitted. The present invention is not limited to the embodiments.

(Embodiment 1)
Embodiment 1 of the present invention will be described below with reference to FIGS. FIG. 1 is a front view of a state in which the door of the refrigerator in the first embodiment of the present invention is opened, FIG. 2 is a sectional view taken along the line BB of FIG. 1 in the same embodiment, and FIG. FIG. 4 is a circuit configuration diagram of the lighting device of the refrigerator according to the first embodiment.

  In FIG. 1 and FIG. 2, the refrigerator main body 10 configured to be insulated from the surroundings with a heat insulating material is divided into a plurality of compartments to form a storage room, and the uppermost part is a refrigerator compartment 11, The ice making room 12 and the first freezing room 13 are arranged side by side immediately below, followed by the vegetable room 15 and the second freezing room 14 at the bottom.

  The refrigerator compartment 11 has a door 18 on the front surface, is provided with a plurality of storage shelves 17 for organizing and storing stored items without overlapping, and is configured to be partially movable up and down. A specific low temperature chamber 16 is provided at the lowest level.

  The illuminating device 20 is disposed in the vertical direction on the left wall surface and the right wall surface in front of the front end of the storage shelf 17 with respect to the depth direction of the interior 11 when viewed from the door opening side front surface in the refrigerator.

  The control board 19 is located on the back surface of the refrigerator body 10, detects the opening / closing operation of the door 18, and controls energization to the lighting device 20.

  In FIG. 3, the illumination device 20 will be described in detail.

  First, the LED substrate 1 is an epoxy resin substrate having a flat plate shape and having good thermal conductivity, in which a light emitting diode 2, a current limiting resistor 3a for limiting the current, and a connection terminal 4 are mounted on a circuit pattern by soldering. It is a metal substrate. The light emitting diodes 2 are formed in a cannonball shape and have a structure for obtaining white light by exciting a fluorescent material using blue light from a GaN-based blue LED, and a plurality of the light emitting diodes 2 are arranged in the vertical direction.

  Next, the LED substrate 1 is held by a spacer 6 integrally formed with the outer frame 9 in a recess 5 provided in the refrigerator side wall 8, and is spaced apart from the light emitting portion of the light emitting diode 2 by a lamp cover. 7 is arranged as a lighting device 20 on the left and right wall surfaces in the refrigerator so that the entire light emitting part of the light emitting diode 2 is covered.

  In FIG. 4, the circuit configuration of the illumination device 20 will be described.

  The circuit configuration includes an LED board 1 in the lighting device 20 and a control board 19 that detects an operating state of the refrigerator and applies an energization input to the LED board 1.

  The circuit of the LED substrate 1 has a configuration in which two light emitting diodes 2 and a current limiting resistor 3a mounted in series are arranged in parallel.

  The circuit of the control board 19 detects the operation state of the refrigerator, and outputs an output signal to the integrated circuit (microcomputer) 30 and the signal to limit the current to the light emitting diode 2 and the transistor unit 31 that switches the energizing voltage to the light emitting diode 2. Current limiting resistor 3b.

  The LED board 1 and the control board 19 are electrically connected by connection terminals 4 provided on each.

  About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the door 18 of the refrigerator body 10 is closed, there is no signal output from the microcomputer 30, the light emitting diode 2 is not energized, and the interior is not illuminated. When the door 18 is opened, an energized voltage is output via the transistor unit 31 by an output signal from the microcomputer 30, and a current limiting resistor 3 b provided on the control board 19 and a current limiting resistor 3 a provided on the LED board 1. The forward current limited by the current flows to the light emitting diode 2 and white light is emitted.

  Next, the white light emitted from the light emitting diode 2 travels to the lamp cover 7 and is irradiated in the interior, but the directivity of the light emitting diode from the front side with respect to the depth dimension of the left and right wall surfaces in the refrigerator compartment. By the irradiation angle set by the above, the light is emphasized with respect to the back direction of the interior and is distributed to the front and side surfaces of the stored item.

  As described above, in the present embodiment, the current limiting resistor for limiting the current value that affects the illuminance and life of the light emitting diode 2 of the lighting device 20 is divided into two, and the control provided on the back of the refrigerator main body. By providing the board 19 and the LED board 1 on which the light emitting diode 2 is mounted provided in the refrigerator cabinet, the heat generation load of the control board 19 can be reduced and the design margin can be improved.

  In addition, it is possible to reduce condensation and sweating of the LED board 1 by using the resistor heating load of the LED board 1 of the lighting device 20 used in the refrigerator cabinet, and it is possible to provide a protection function against static electricity of the LED board 1. Therefore, the LED substrate 1 can be protected from static electricity or the like generated when the LED substrate 1 is attached to the refrigerator body 10.

  Further, when the current of the light emitting diode 2 is changed by providing the resistor 3 a on the LED substrate 1, the specification can be changed only by changing the resistor 3 a of the LED substrate 1 without changing the control board 19.

  In the embodiment of the present invention, the amount of heat generated on the LED board as the lighting device in the refrigerator can be increased by mounting the current limiting resistor of the lighting device having the larger limit value on the LED substrate. The dew condensation and sweating on the LED substrate due to the intrusion of warm air when the door is opened can be further suppressed.

  Further, in the embodiment of the present invention, the amount of heat generated on the LED board as the lighting device in the refrigerator can be reduced by mounting the smaller limit value on the LED board with the current limiting resistor of the lighting device. The temperature rise in the refrigerator can be suppressed.

  As described above, the lighting device for a refrigerator according to the present invention is applied to light emitting diode lighting such as an article storage device with a door, as well as to the case where light emitting diode lighting is applied to a household or commercial refrigerator. It can be applied to a wide range of equipment.

The front view of the state which opened the door of the refrigerator in Embodiment 1 of this invention BB sectional view of FIG. 1 in the same embodiment The principal part longitudinal cross-sectional view of the illuminating device of the refrigerator in the same embodiment Circuit configuration diagram of the lighting device of the refrigerator in the same embodiment A perspective view of a conventional ice making machine lighting device Conceptual diagram of the lighting device of FIG. 5 installed on the top surface of the ice machine

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 LED board 2 Light emitting diode 3a Current limiting resistor 3b Current limiting resistor 4 Connection terminal 10 Refrigerator main body 11 Refrigerating room 18 Door 19 Control board 20 Illuminating device 30 Integrated circuit (microcomputer)
31 Transistor part

Claims (4)

  The light emitting diode in a refrigerator, comprising: an LED board mounted in a cabinet and mounted with a light emitting diode as interior lighting; and a control board that is located outside the cabinet and supplies a voltage to the LED board according to the operating state of the refrigerator. A lighting device for a refrigerator, wherein a current limiting resistor for limiting a current to the substrate is divided into two or more, and at least one of the current limiting resistors is mounted on the LED substrate.   The lighting device for a refrigerator according to claim 1, wherein the current limiting resistor is mounted on each of the LED board and the control board.   The lighting device for a refrigerator according to claim 2, wherein the current limiting resistor has a larger limit value mounted on the LED substrate.   The lighting device for a refrigerator according to claim 2, wherein the current limiting resistor has a smaller limit value mounted on the LED substrate.

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