JP2010112572A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator having at least a panel including an electric circuit, and constituted to be easily taken out from a refrigerator body. <P>SOLUTION: This refrigerator having the panel 2 including the electric circuit 22, and a secondary coil 21 electrically connected with the electric circuit 22, and disposed detachably from the refrigerator body 1a, further has a panel holding section 13 for holding the panel 2, and a primary coil 11 disposed in the panel holding section 13 or the refrigerator body 1a, and wireless power transmission can be performed from the primary coil 11 to the secondary coil 21, when the panel 2 is disposed on the panel holding section 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a refrigerator that includes an electrical circuit and includes a panel that is detachably disposed on the refrigerator body.

  In general, the illumination in the refrigerator is arranged above, below, behind, and on the inner wall of the refrigerator, and is configured to be supplied with power to the lighting device when the refrigerator door is opened. However, the refrigerator is provided with a panel for partitioning up and down, and the ingredients are placed on this panel for cooling and storage, so that it is easy to create a shadow part of the lighting, and the visibility of the ingredients may deteriorate. there were. It was also desirable that this panel could be easily removed to make it easier to wash when dirty.

By the way, as a lighting device for a refrigerator, for example, a method of illuminating a wide area by combining a light source and a light guide plate to emit light in a planar shape has been proposed (for example, see Patent Document 1).
Moreover, in order to supply electric power to the movable door part from the main body in the refrigerator, a method using a wireless power transfer using a coil has been proposed (for example, see Patent Document 2).
Moreover, it is known that the functionality of a foodstuff will improve by irradiating the foodstuff in a refrigerator with light (for example, refer nonpatent literature 1). That is, a method for improving usability and functionality by incorporating a mechanism using an electric circuit that operates by obtaining electric power in addition to a mechanism related to cooling is known inside a food storage such as a refrigerator. .

JP-A-9-203582 (FIG. 1) Japanese Patent No. 3616348 (FIG. 1) "Electromagnetic waves and food", edited by Omori, Korinsha, 1993

  However, a configuration in which an electrical circuit connected to a light source or the like is disposed on a panel disposed in the refrigerator and the panel can be easily removed has not been proposed yet. In addition, a mechanism for efficiently conveying power to an electric circuit arranged on a vertically movable panel has not been proposed yet.

  This invention is made | formed in view of the above situations, and an object of this invention is to provide the refrigerator provided with the panel provided with the electric circuit and the structure which can be easily removed from a refrigerator main body at least.

  A refrigerator according to the present invention is a refrigerator that includes an electrical circuit and a secondary coil that is electrically connected to the electrical circuit, and includes a panel that is detachably disposed from the refrigerator body. A panel holding unit for holding, and a primary coil disposed in the panel holding unit or the refrigerator main body, and when the panel is disposed in the panel holding unit, the primary coil to the secondary coil It enables wireless power transfer to the coil.

  In the present invention, by providing the above-described configuration, it is possible to supply power to the electric circuit disposed on the panel and to remove the panel easily by simply installing the panel on the panel holding portion. Therefore, it is easy to clean and replace the panel. For example, by incorporating an illuminating device into an electric circuit, it is possible to illuminate a wide range in a refrigerator provided with a panel, and visibility is improved.

Embodiment 1 FIG.
FIG. 1 is a front view of the refrigerator according to Embodiment 1 of the present invention with the door removed.
The main body 1 a of the refrigerator 1 is provided with a panel holding unit 13, and the primary coil 11 is installed in the panel holding unit 13. AC power is supplied to the primary coil 11 from the power source 17. The panel 2 is hold | maintained by the panel holding | maintenance part 13, and is comprised so that removal from the refrigerator main body 1a is possible. The panel 2 is provided with a secondary coil 21, and an electrical circuit 22 is connected to the secondary coil 21.

FIG. 2 is a diagram showing details of a connection portion between the panel 2 and the panel holding unit 13.
As shown in FIG. 2, the panel 2 is provided with a secondary coil 21 so that the coil surface is substantially horizontal, and a circular hole (second engagement portion) 2a is formed in the center of the coil. ing. The panel holding part 13 which receives this panel 2 protrudes inward from the inner wall surface of the refrigerator main body 1a, and is composed of a member whose upper surface is substantially flat and whose lower surface is inclined, so that the coil surface is in a substantially horizontal direction. A primary coil 11 is arranged. The panel holding portion 13 corresponding to the coil central portion of the primary coil 11 is provided with, for example, a substantially hemispherical protrusion (first engagement portion) 14. In addition, the panel holding | maintenance part 13 may be provided continuously in the direction orthogonal to the paper surface of a figure, or may be provided discretely (in that case, it is two places in the orthogonal direction).

When installing the panel 2 in the refrigerator main body 1a, the hole 2a of the panel 2 and the protrusion 14 of the panel holding part 13 are fitted, and the dropout and displacement of the panel 2 are suppressed. Since the position of 12 is determined, the efficiency of power transfer between the coils can be increased.
If an electric circuit (not shown, but see FIG. 12) is provided between the primary coil 11 and the power source 17, and the input power of the primary coil 11 is controlled by the control of the electric circuit, the power Optimal power input can be performed according to the electrical load on the transport and the secondary side.

By the way, the shape of the primary coil 11 and the secondary coil 21 may not be circular, but a magnetic field may be generated on the central axis, and may be a substantially square shape or an irregular shape. Further, the protrusion 14 may not be hemispherical, and may be a cylinder or a prism.
Further, the hole 2a of the panel 2 corresponding to the second engaging portion of the present invention does not need to penetrate, and if the panel can be positioned on the panel holding portion 13, a recess (2b, 3) may be formed, or the contact portion between the panel holding portion 13 and the panel 2 may be subjected to fine uneven processing to prevent slippage.
Moreover, it is desirable to arrange the panel holding part 13 as small as possible so as not to reduce the internal volume of the refrigerator 1, and it may be provided on the inner side of the wall of the refrigerator main body 1a.
Further, a temperature sensor and a current sensor are provided in the vicinity of the primary coil 11 and the secondary coil 21, and the temperature sensor and the current sensor cause excessive power to the primary coil 11 and the secondary coil 21 when the refrigerator 1 fails, for example. If it is supplied and the temperature rises excessively, it may be detected.

Embodiment 2. FIG.
FIG. 3 is a diagram showing details of a connection portion between panel 2 and panel holding portion 13 of the refrigerator according to Embodiment 2 of the present invention.
In the second embodiment, a columnar core 12 is disposed inside a protrusion 14 formed for panel positioning. By making the panel holding portion 13 such a structure, when the panel 2 is installed in the panel holding portion 13, the primary coil 11, the secondary coil 21, and the core 12 are positioned on substantially the same horizontal plane, and The core 12 can penetrate the central axes of the primary coil 11 and the secondary coil 21. For this reason, the wireless power transfer efficiency between the coils 11 and 21 is improved.

The core 12 may not be cylindrical in shape, and may be arranged on the back side, outer edge side, or secondary coil side of the primary coil 11.
Further, in the example of FIG. 3, in addition to the protrusions 14, fitting portions (engaging portions) 2 c and 13 c between the panel 2 and the panel holding portion 13 are provided. However, the mechanism of the engaging portion for engaging and positioning the panel 2 and the panel holding portion 13 is not limited to the example of FIGS. 2 and 3, and any mechanism depending on the required strength and shape. It is good also as a structure.

Embodiment 3 FIG.
FIG. 4 is a diagram showing details of a connection portion between panel 2 and panel holding portion 13 of the refrigerator according to Embodiment 3 of the present invention.
In the third embodiment, the core 12 is disposed on the inner side (inner diameter side) of the primary coil 11 and is embedded in the protrusion 14. With this configuration, when the panel 2 is installed on the panel holding unit 13, the secondary coil 21, the primary coil 11, and the core 12 are disposed on substantially the same horizontal plane, and the coil 11 , 21 improves the wireless power transfer efficiency.
In the example of FIG. 4, the primary coil 11 is inside the secondary coil 21, but the secondary coil 21 may be inside and the core 12 may be on the panel 2 side. In such a case, the protrusion 14 is provided on the panel 2 side.

Embodiment 4 FIG.
FIG. 5 is a diagram showing details of a connection portion between panel 2 and panel holding portion 13 of the refrigerator according to Embodiment 4 of the present invention.
In this Embodiment 4, the primary coil 11 and the secondary coil 21 are arrange | positioned so that a coil surface may become a substantially perpendicular direction, and the panel holding part 13 comprises the slit. That is, the end portion of the panel 2 is bent downward at a right angle, and the secondary coil 21 is disposed in the end portion. The panel holding part 13 is bent upward at a right angle so that a slit part 13d is formed between the panel holding part 13 and the inner wall surface of the refrigerator main body 1a. And the primary coil 11 and the core 12 are arrange | positioned in the wall surface of the refrigerator main body 1a. The core 12 has a configuration in which the back and side surfaces of the primary coil 11 and the end portion extend to the tip end side in the panel holding portion 13.
In this Embodiment 4, when the edge part of the panel 2 is inserted in the slit part 13d of the panel holding part 13, the primary coil 11 by the side of the refrigerator main body 1a and the secondary coil 21 by the side of the panel 2 are opposingly arranged, and The magnetic circuit is configured in a state in which the core 12 covers the back side and the side surface on the primary coil side, and further to the back surface of the secondary coil.

  In the fourth embodiment, by adopting the configuration as described above, the panel holding portion 13 can be formed thin, and the inside dead volume can be reduced. Moreover, when the core 12 comprises a magnetic circuit as described above, the wireless power transfer efficiency between the coils 11 and 21 is improved, and leakage of electromagnetic waves can be effectively suppressed.

Embodiment 5 FIG.
FIG. 6 is a diagram showing details of a connection portion between panel 2 and panel holding portion 13 of the refrigerator according to Embodiment 5 of the present invention.
In the fifth embodiment, the panel holding portion 13 is separated from the refrigerator body 1a, and a screw mechanism 13e is provided on the back surface of the panel holding portion 13, and the screw mechanism 13e is engaged on the refrigerator body 1a side. A moving device 16 comprising a gear is provided. The screw mechanism 13e and the moving device 16 constitute the lifting mechanism of the present invention.
By rotating the moving device 16, the gear engages with the screw mechanism 13e, whereby the panel 2 can be moved up and down. Thus, by moving the panel 2 up and down, the volume of the interior space above and below the panel 2 can be easily increased or decreased. At this time, the movement range 141 of the panel holding unit 13 is specified. The movement range 141 of the panel holding unit 13 by the moving device 16 is set such that, for example, FIG. 6A is the upper limit position of the panel 2 and FIG. 6B is the lower limit position of the panel 2. Is adjusted from the inner side of the secondary coil 21 to adjust the arrangement position of the moving range 141 and the coils 11 and 12, so that the secondary position from the primary coil 11 can be increased regardless of the position of the panel holding unit 13. Wireless power transfer to the coil 21 can be performed.
In the fifth embodiment, even when the panel 2 is moved up and down as described above, the power can be transferred wirelessly, and the panel partition position can be changed according to the size of the food stored in the refrigerator.

Embodiment 6 FIG.
FIG. 7 is a diagram showing details of a connection portion between panel 2 and panel holding portion 13 of the refrigerator according to Embodiment 6 of the present invention.
In the sixth embodiment, a rectifier circuit 221 that converts AC power conveyed to the secondary coil 21 into DC power is connected to the secondary coil 21, and the output side of the rectifier circuit 221 is driven with a DC voltage. The light source 231 to be connected is connected. A leaky light guide plate 232 is connected to the light source 231. With this leaky light guide plate 232, the entire surface or a part of the panel 2 can be used as a light emission source.
In this Embodiment 6, by making the panel 2 into such a form, a light source can be provided in the removable panel 2, and the freedom of the installation position of illumination can be increased. In addition, a leaky light guide plate 232 is connected to the light source 231, and the entire or part of the panel surface is used as a light emitting light source. With this configuration, food or the like is put on the panel 2. However, light can be irradiated over a wide range without being shielded, and visibility can be improved.

  Note that the positions of the light source 231 and the leaky light guide plate 232 shown in FIG. 7, the form of the individual light emitting surfaces, the irradiation direction, etc. are not limited to the example shown in the figure, but may be anything. It is desirable to arrange the light emitting portion so as to meet the purpose of improving the visibility of stored foods and the like and reduce the blind spot of light irradiation.

FIG. 8 is a diagram showing an example of a detailed structure of the leaky light guide plate.
Here, the panel itself is formed by using a leaky light guide plate 232, and surface treatment is performed so that light is radiated strongly to the lower part and weakly to the upper part. Further, an end face reflecting portion 241 made of a reflecting plate is provided on the end face so that the light emission intensity on the side away from the light source 231 does not decrease. In addition, the upper part of the leaky light guide plate 232 prevents wrinkles from being made of a coating film on the surface so that the surface is not wrinkled due to friction with food or a case containing food, and the light guide property is not impaired. A coating 240 is applied. In the optical design of the leaky light guide plate 232, the light intensity on the surface of the leaky light guide plate is made uniform or a light intensity distribution with high design properties in consideration of the refractive index of the wrinkle prevention coating 240.
In the sixth embodiment, the light source 231 connected to the electric circuit 22 arranged in the panel 2 is used in this way, and a structure (leakage type light guide plate 232) for illuminating the interior in a wide range is added. The visibility in the storage can be remarkably improved.

Further, the surface of the panel 2 or the surface of the refrigerator inner wall or the like may be coated with a so-called photocatalyst having a deodorizing and sterilizing function when irradiated with light. In this case, it is desirable to arrange a light source so that a sufficient amount of light can be irradiated on the photocatalyst coating surface to obtain a catalytic action. Also, when the internal temperature rises due to periodic or defrosting and there is a concern about microbial growth, or when the output value of the internal odor sensor increases and there is a concern about an increase in the internal odor concentration, etc. It is desirable to turn on the interior lighting and perform the deodorizing or sterilizing operation even when the refrigerator door is closed. Such a system for photocatalyst application has the effect of maintaining performance over a long period of time by using the removable panel 2 as a light source, so that it can be easily removed and cleaned when the surface of the light source becomes dirty. Alternatively, by using a panel (see FIG. 6) that can be moved up and down as a light source, even if food is placed at the bottom of the panel 2, the panel can be easily moved upward to create a space at the bottom of the panel. Since the light emitting part provided at the lower part of the panel 2 can be easily cleaned, the performance can be easily maintained.
Moreover, if this Embodiment 6 is applied to said Embodiment 5, it will install efficiently in the electric circuit arrange | positioned in the refrigerator 2 which can be removed in a refrigerator and can be moved up and down. Power can be carried wirelessly.

Embodiment 7 FIG.
FIG. 9 is a cross-sectional view showing the configuration of the refrigerator according to Embodiment 7 of the present invention.
FIG. 9 shows a cross-sectional view as seen from the side of the refrigerator. The power carrying portion provided with the coils 11 and 21 is provided on the inner side of the refrigerator, and a part of the light emitted from the light source 231 is guided by the light guide 233. The structure which can be led to the panel door side end surface 201 and can increase the luminance of the end surface 201 is shown. By adopting such a form, when the refrigerator door 101 is opened, the interior lighting can be turned on, the front part of the panel 2 can be made to emit light, the design is improved, and the taken out foodstuffs Easy to see on the front side of the panel.

  Further, when the refrigerator light source 101 is operated when the refrigerator door 101 is closed, the light emitted from the interior door side one end surface 201 of the panel 2 is transmitted through the door light guide 102 provided on the door. The design part 103 of the door side end surface 201 can be reached. When the refrigerator door 101 is closed, if it has a function of obtaining the effect of light irradiation, the light source is turned on while the refrigerator door 101 is closed by adopting the above-described form. It can be easily confirmed from outside the refrigerator, and the function of the refrigerator can be visually grasped.

  FIG. 10 is an example showing the connection method between the light source 231 and the light guide unit 232 in more detail. A prism 235 is connected to the light emitting surface 234 of the light source 231, and part of the light emitted from the light emitting surface is guided to the light emitting unit 236 on the lower surface of the panel. Part of the light is guided to the light guide unit 232 through the lens 237 and further reaches the panel door side end surface 201. By setting it as such a form, the light irradiated with the electric power conveyed by the secondary coil 201 can be used efficiently for interior illumination or design illumination, and the function of the panel 2 can be improved.

FIGS. 11A and 11B are examples illustrating the positional relationship between the light source 231 and the leaky light guide plate 232 in the panel 2 in more detail. FIG. 11A is a perspective view and FIG. 11B is a plan view.
The panel 2 includes a light emitting unit 24 in which a leaky light guide plate 232 is disposed and a non-light emitting unit 25 in which no light guide plate is installed. A light source 231 is appropriately disposed on the side surface of the light emitting unit 24. The secondary coil 21 is installed in the non-light emitting portion 25 and has a structure in which the wiring between the light source 231 and the rectifier circuit 221 is disposed on the side surface of the panel 2 and the light source / wiring portion 238 on the back side.
By adopting such a configuration, there is no wiring or the like above and below the panel light emitting part 24, and the design property when the top and bottom of the light emitting part 24 emit light simultaneously is improved, and the food at the top of the panel 2 is visually recognized. Improves. Further, by controlling the light emission intensity distribution and / or the direction of light emission of the leaky light guide plate 232, the illuminance distribution in the lower part of the panel 2 is made uniform even if the light emitting unit 24 is a part of the panel 2. Can do.

Embodiment 8 FIG.
FIG. 12 is a cross-sectional view showing a configuration of a refrigerator according to Embodiment 8 of the present invention.
In FIG. 12, when the visible light emitted from the light source 231 reaches the door side end surface of the panel 2 through the light guide 233 and the door 101 is closed, it is reflected by the door inner reflection plate 104 provided on the door. Then, the light detection unit 239 is reached again through the light guide unit 233 and a signal is transmitted to the electric circuit 22. This signal is converted into an AC signal by the electric circuit 22 (or the signal is converted into an AC signal after data processing) and transmitted to the secondary coil 21. The signal transmitted to the secondary coil 21 is superimposed on the alternating current for wireless power transfer, transmitted wirelessly to the primary coil 11 side, and the door opening / closing status in the information processing unit 110 connected to the electric circuit 22 Judging. The information processing unit 110 determines that the door is open during a period in which a signal from the door inner reflector 104 is not detected, and notifies the user by the notification device 111 when the opening time exceeds a predetermined time. That is, by using the secondary coil 21 of the panel 2 and the primary coil 11 of the panel holding unit 13, the power is wirelessly conveyed to the optical door opening / closing detection mechanism disposed on the panel 2 and the detection is performed. Information obtained by the mechanism can be communicated wirelessly to the refrigerator body 1a.

  Here, the device connected to the electrical circuit 22 of the panel 2 is not limited to the light source 231 and the light detection unit 239. For example, by arranging the microwave generator and the temperature sensor in combination, microwave irradiation is intermittently performed on the panel 2 so as to maintain the food at a predetermined temperature, and the food near the microwave generator in the refrigerator Can be maintained in a higher temperature zone than food placed in a different position in the cabinet. Alternatively, by mapping many object locations on the panel by arranging many antennas that generate electric fields and detect reflected waves, there is an object that has not been moved on the panel for a long time from this mapping information. It is also possible to notify that it is present.

The light source 231 may be any device that generates visible light. For example, a microwave generator that generates visible light may be used as the light source 231.
Moreover, said Embodiment 1-Embodiment 7 may comprise the refrigerator of this invention combining suitably mutually.

It is a front view of the refrigerator which concerns on Embodiment 1 of this invention. It is the figure which showed the detail of the connection part of the panel 2 which concerns on Embodiment 1 of this invention, and the panel holding | maintenance part 13. FIG. It is the figure which showed the detail of the connection part of the panel 2 and the panel holding | maintenance part 13 of the refrigerator which concerns on Embodiment 2 of this invention. It is the figure which showed the detail of the connection part of the panel 2 and panel holding | maintenance part 13 of the refrigerator which concerns on Embodiment 3 of this invention. It is the figure which showed the detail of the connection part of the panel 2 and panel holding | maintenance part 13 of the refrigerator which concerns on Embodiment 4 of this invention. It is the figure which showed the detail of the connection part of the panel 2 and panel holding | maintenance part 13 of the refrigerator which concerns on Embodiment 5 of this invention. It is the figure which showed the detail of the connection part of the panel 2 and panel holding | maintenance part 13 of the refrigerator which concerns on Embodiment 6 of this invention. It is the figure which showed an example of the detailed structure of a leakage type light-guide plate. It is sectional drawing which showed the structure of the refrigerator which concerns on Embodiment 7 of this invention. This is an example showing the connection method between the light source 231 and the light guide unit 232 in more detail. It is an example shown in more detail about the positional relationship of the light source 231 and the leakage type light-guide plate 232 in the panel 2, (A) is a perspective view, (B) is a top view. It is sectional drawing which showed the structure of the refrigerator which concerns on Embodiment 8 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Refrigerator, 2 Panel, 11 Primary coil, 12 Core, 13 Panel holding part, 14 Protrusion part, 15 Coil center position, 16 Moving device, 17 Power supply, 21 Secondary coil, 22 Electrical circuit, 101 Door, 102 Door guide Light part, 103 Door design part, 110 Information processing circuit, 111 Notification device, 221 Rectifier circuit, 231 Light source, 232 Leakage type light guide plate, 233 Light guide part, 234 Light source emission surface, 235 Prism, 236 Light emission part under panel 237 Lens, 238 Light source / wiring part, 239 Light detection part, 240 Anti-fouling coating, 241 End face reflection part.

Claims (17)

A refrigerator comprising an electric circuit and a secondary coil electrically connected to the electric circuit, the panel including a panel detachably disposed from the refrigerator body,
A panel holding portion for holding the panel;
A primary coil disposed in the panel holding part or the refrigerator body,
A refrigerator capable of carrying wireless power from the primary coil to the secondary coil when the panel is disposed in the panel holding portion. The primary coil and the secondary coil are disposed such that the coil surface is substantially horizontal,
The panel holding portion includes a first engagement portion at a position corresponding to a coil inner diameter portion of the primary coil,
A second engagement portion at a position corresponding to a coil inner diameter portion of the secondary coil of the panel;
The refrigerator according to claim 1, wherein the first engagement portion of the panel holding portion engages with the second engagement portion of the panel when the panel is installed to position the panel.   The refrigerator according to claim 1 or 2, wherein a substantially cylindrical core is disposed at a position penetrating the primary coil and the secondary coil.   The refrigerator according to claim 3, wherein the primary coil, the secondary coil, and the core are disposed on substantially the same horizontal plane when the panel is installed. The primary coil is disposed in the vicinity of the panel holding portion of the refrigerator body so that the coil surface is in a substantially vertical direction, and a core is disposed on the inner diameter central axis portion,
The secondary coil is disposed on the panel so that a coil surface is in a substantially vertical direction,
The refrigerator according to claim 1, wherein the panel holding unit holds the panel so that the core faces an inner diameter portion of the secondary coil. The panel holding part is a separate structure from the refrigerator body,
The refrigerator according to any one of claims 1 to 5, further comprising an elevating mechanism that moves the panel holding portion in the vertical direction.   The elevating mechanism holds a positional relationship such that a central axis of the primary coil does not deviate from the inside of the secondary coil when the panel holding portion is moved up and down. 6. The refrigerator according to 6.   The refrigerator according to any one of claims 1 to 7, wherein a visible light source that emits visible light is connected to the secondary coil.   The refrigerator according to any one of claims 1 to 7, wherein the electromagnetic wave generator is connected to the secondary coil.   The refrigerator according to claim 9, wherein the electromagnetic wave generator is a visible light source.   A part of the visible light emitted from the visible light source is irradiated at least into the refrigerator, and a part of the visible light is emitted in a substantially front direction to increase the luminance of the front end portion of the panel. The refrigerator of Claim 8 or 10 characterized by these.   The refrigerator according to claim 11, wherein a leaky light guide plate is connected to the visible light source, and a part of the visible light emitted from the visible light source is irradiated into the refrigerator.   The refrigerator according to claim 11 or 12, wherein the light emitting part at the front end of the panel is visible from the outside of a refrigerator door provided in the refrigerator body.   The refrigerator according to claim 13, wherein the refrigerator door includes a door light guide unit that guides light emitted from the front end portion of the panel to the surface side of the refrigerator door through the refrigerator door. The panel includes a light emitting unit formed on each of the left and right sides of the refrigerator main body, and a non-light emitting unit positioned between the light emitting units.
The light emitting part is composed of a leaky light guide plate,
The refrigerator according to claim 8 or 10, wherein the visible light source is disposed on an outer wall side of the light emitting unit.   It has a mechanism for receiving a reflected wave of light emitted from the visible light source, superimposing a received signal or a data-processed signal on the secondary coil, and transmitting the signal to the primary coil side. The refrigerator according to claim 8 or 10.   The refrigerator according to claim 16, wherein an open / closed state of the refrigerator door is detected on the refrigerator main body side.

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