JP3440033B2 - Refrigerator door opening device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door opening device for a refrigerator.

[0002]

2. Description of the Related Art In recent years, the usability of devices used at home has been emphasized in view of the aging society. In particular, in a refrigerator, which is a large-sized device, the door has become relatively large in accordance with the recent trend toward larger size and larger capacity, and the tendency of opening and closing the door cannot be ignored. Therefore, a door opening device has been proposed in the past with the aim of assisting the opening and closing of the door in a refrigerator and reducing the load particularly when the door is opened.

An example of a conventional door opening device for a refrigerator is disclosed in Japanese Patent Laid-Open No. 5-141853.

Hereinafter, the conventional door opening device for a refrigerator will be described with reference to the drawings.

FIG. 9 is a sectional view of a conventional door opening device for a refrigerator, and FIG. 10 is a sectional view of a driving device. In FIG. 9, reference numeral 1 denotes a refrigerator main body, which includes a heat insulating box 2 having a front opening and a door 3 for opening and closing the opening of the heat insulating box 2.

Reference numeral 4 is a door opening device for opening the door 3, and reference numeral 5 is a door opening switch provided near the handle 6 of the door 3. Reference numeral 7 is a door switch for detecting opening / closing of the door 3, and 8 is a drive device for assisting the opening of the door 3 by pushing out the surface of the door 3 on the non-pivotal side. Installed. Reference numeral 10 denotes a drive unit, which includes a motor (not shown), a cam for converting rotational movement into reciprocating movement, and a control member for controlling the operation of the motor.

Reference numeral 11 denotes an extruding member, which is a rod-shaped member having a rear end projecting rearward from the case 12 by a backward movement and a front end projecting forward from the case 12 by a forward movement. Further, 13a and 13b are position detection switches for detecting the position of the pushing member 11. A stop switch 14 is provided on the non-pivot side surface of the door 3 and at a position facing the push-out portion within the operating range of the push-out portion.

The operation of the door opening device for a refrigerator constructed as described above will be described below.

The drive device 8 is driven by the door opening switch 5. After the power is turned on, the pushing member 11 is first retracted and then moved forward at the first speed to come into contact with the surface of the door 3 on the non-pivotal side and stop to enter the standby state. Next, door open switch 5
Based on the above operation, the pushing member 11 is moved forward at a second speed higher than the first speed. In addition, position detection switches 13A and 1A are used for position detection and stop of these operations.
3B and stop switch 14 are used. As a result, if the door opening switch 5 is not operated, the push-out member 11 will not move to the door 3
Since it stands by in contact with the surface on the non-pivotal side, it is not necessary to release the engagement between the drive device 8 and the door 3 when manually opening the door 3. Further, since the pushing member moves forward at the second speed higher than the first speed, the kinetic energy of the pushing member is increased and the door can be pushed out with a large force.

[0010]

However, in the above-mentioned conventional structure, since one driving device has only one pushing member, only one door can be pushed by one driving device with a pressing force. Can't open Therefore, it is necessary to provide a plurality of drive devices in a refrigerator having a plurality of doors, which is expensive, the space for housing the drive devices is large, and the heat insulation performance of the refrigerator is impaired.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to reduce the cost and to reduce the storage space of the drive unit when a plurality of doors are opened.

Further, in the above-mentioned conventional structure, the pushing member 11 is operated by the driving device 8 by the door opening switch 5 to open the door 3 by the pressing force, but the door 3 cannot be opened up to 90 °. There was a flaw.

Another object of the present invention is to provide a door opening device capable of opening the door up to 90 °.

Further, in the above-mentioned conventional structure, the door opening switch 5 is mounted near the handle, but it is not a structure suitable for a person to naturally open and close the door. It is necessary to open the door 3 by grasping the handle 6, and even if the door open switch 5 is touched carelessly, the door 3
It had the drawback of opening.

Another object of the present invention is to provide a door opening device that does not interfere with a person's natural door opening operation and does not malfunction.

[0016]

In order to achieve this object, the present invention provides a refrigerator provided with a plurality of doors for opening and closing a plurality of storage chambers partitioned by a partition, which is operated based on an opening signal. A drive unit equipped with one drive source and two pushing members driven by this driving source is provided inside the partitioning section, and a plurality of doors in a closed state according to the operation of the driving source are pushed by the pushing force of the pushing member. It is to open it.

Thus, when a plurality of doors are opened, the cost can be reduced and the storage space for the drive unit can be reduced.

Further, according to the present invention, the hinge portion of the door is provided with a spring for operating the door in the opening direction.

As a result, the door can be opened up to 90 °.

Further, according to the present invention, a handle provided on a part of the door, a conductor provided on a portion of the back surface of the handle touched by a hand for detecting electrostatic capacitance of a human body, and a release signal from the conductor. And a control device for operating the drive device.

As a result, it is possible to prevent malfunctions without hindering a person's natural door opening operation.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a partition part for partitioning the interior of a refrigerator into a plurality of storage chambers, a plurality of doors for opening and closing the opening of the storage chamber, and an opening signal. and one motor is operated on the basis of the motor
-The gear that reduces the rotational force of the gear meshes with the gear.
The drive device is provided with two pushing members having a rack carved, and the drive device is provided inside the partition part, and the gear is rotated by reversing the rotation direction of the motor.
And the two extrusions through the engagement of the rack
The members are alternately pushed out to open the plurality of doors in the closed state by the pushing pressure of the pushing member, and the pushing member on the door side to be opened is selectively pushed by the driving of the driving source, and the pushing margin The door is separated from the main body by an amount, and the sealed state between the main body and the door is released. And the drive unit is housed in the partition of the main body,
Only the pushing member projects.

According to a second aspect of the present invention, a pair of left and right double doors are provided at the opening of the storage chamber, a single motor operated based on an opening signal, and a rotational force of the motor.
The gear that reduces the speed and the rack that meshes with the gear are marked.
More become one of the driving device provided with two push-out member I, by providing the driving device at the top or bottom of the refrigerator body door with unsupported side of the casement door, the motor
Of the gear and the rack by the reversing operation of the rotation direction of
Alternately press the two extruding members through the mating
This is to open and close the double door that is in a closed state by the pushing force of the pushing member, and the upper end or the lower end of the double door that you want to open is pushed by the pushing member by the drive of the motor, and only the pushing amount. The door is separated from the main body, and the sealed state between the main body and the door is released. And, the driving device is installed outside the storage space of the body above or below the door so as not to invade the storage space.

The invention as defined in claim 3 is as set forth in claim 2.
In the invention described above, a hinge for pivotally supporting the double door is provided, and a spring provided in the door below the hinge for operating the door in the opening direction is provided. The door is separated from the main body and the sealed state is released, and the urging force of the spring in the opening direction causes the door to open up to 90 ° without human intervention.

The invention described in claim 4 is the invention according to claims 1 to 3.
In the invention according to any one of the items 1 to 3, a handle provided on a part of the door, a conductor provided on a portion of the back surface of the handle that is touched by a hand to detect capacitance of a human body, and a conductor from the conductor It is equipped with a control device that operates the drive device with an open signal, and when a person grips the handle, the conductor naturally detects the electrostatic capacity of the human body and drives the drive device to maintain a closed state with the door. To release. And, the conductor is on the back surface of the handle to avoid accidental contact.

According to a fifth aspect of the present invention, in the invention according to the fourth aspect, the handle is formed of a non-conductive material, and a conductive material is attached to the back surface over the entire height, and a person handles the handle. The conductor detects the electrostatic capacity of the human body in a natural form no matter which position is held, and drives the driving device to release the closed state of the door.

According to a sixth aspect of the invention, in the invention of the fourth aspect, the handle is made of metal, and
An insulating coating is applied to the front surface, and a thin conductor is attached to the back surface over the entire height, so that no matter where the person grips the handle, the exposed metal conductive part on the back of the handle will naturally form. The electrostatic capacitance of the human body is detected by touching it, and the drive device is driven to release the closed state of the door. And
Insulating coating on the front of the handle prevents it from being inadvertently touched by the human body.

The invention described in claim 7 is from claim 4 to claim 6.
In the invention described in any one of the above items, the detection circuit for detecting the electrostatic capacity of the human body is housed in the fixed portion of the handle of the door, and the distance between the conductive portion provided in the grip portion of the handle and the detection circuit is Close to each other, making false detection difficult.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a door opening device for a refrigerator according to the present invention will be described below with reference to the drawings. It should be noted that the same configurations as those of the conventional one are denoted by the same reference numerals and detailed description thereof will be omitted.

(Embodiment 1) FIG. 1 is a sectional view of a refrigerator according to Embodiment 1 of the present invention. FIG. 2 is a sectional view of a drive device in the door opening device. FIG. 3 is a control block diagram of the door opening device. FIG. 4 is a sectional view showing a state of each part of the door opening device.

In FIG. 1, 15 is a refrigerator main body,
A freezing compartment 17 is formed in the upper part and a refrigerating compartment 18 is formed in the lower part by the partition part 16. Reference numeral 19 is a freezer compartment door, and 20 is a refrigeration compartment door. The door 19 of the freezer compartment is supported by the hinges 21 and 22, and rotates about the hinges 21 and 22, and the door 20 of the refrigerator compartment is supported by the hinges 22 and 23 and hinges 22 and 23.
It is attached so as to rotate around. And
The door 19 of the freezer compartment and the door 20 of the refrigerator compartment are respectively the freezer compartment 1
7. Open and close the front opening of the refrigerator compartment 18.

Further, a freezer compartment door 19 is provided in the partition section 16.
And a drive device 24 for independently pushing out the refrigerator compartment door 20. The drive unit 24 has a freezer compartment door 1
Extruding member 25 for extruding 9 and refrigerator compartment door 20
An extruding member 26 is provided for extruding. Two
Reference numeral 7 denotes a freezer compartment door handle, and 28 denotes a refrigeration compartment door handle. Conductors for detecting electrostatic capacitance of the human body are provided on the backs of the handles 27 and 28 at portions touched by human hands. 29 and 30 are provided.

In FIG. 2, 31 is an outer shell case of the drive unit 24, and 32 is a motor corresponding to a drive source. Then, in order to reduce the rotational force obtained by the motor 32, the rotation is transmitted by the worm gear 33, the spur gears 34 and 35, and the output gear 36, resulting in high torque. In addition, the pushing member 2 corresponding to the inside of the outer shell case 31
Racks 37 are engraved on the side surfaces of 5 and 26, and are configured so that the teeth of the rotating output gear 36 mesh with the rack 37 to convert the rotational movement of the pushing members 25 and 26 into reciprocating movement.

Further, in FIG. 3, reference numeral 38 is a control device of the door opening device, which controls the operation of the drive device 24 on the output side by the input from the conductors 29 and 30.

The operation of the refrigerator door opening device constructed as described above will be described below.

In FIG. 4 (A), when a person holds the handle 27 of the freezer compartment door in order to open the freezer compartment door 19, the electrostatic capacitance of the person is detected in the portion of the handle 27 on the back of the hand. The electric conductor 29 for detecting detects that a person grips the handle 27 and sends a signal to the control device 38. In response to the signal, the control device 38 rotates the motor 32 of the drive device 24 in the right direction, decelerates it by the spur gears 34 and 35, and the output gear 36, and pushes the pushing member 25 forward. And
The push-out member 25 opens the freezer compartment door 19.
This state is shown in FIG.

Next, in FIG. 4 (B), after the door 19 is opened, the motor 32 is stopped, and then the motor 32 is rotated leftward to move the pushing member 25 to its original position, that is, in FIG. 4 (A). Return to the state. By this operation, the pushing member does not become an obstacle when a person manually closes the door 19.

Next, in order for a person to open the refrigerator door 20,
When the handle 28 of the door of the refrigerating room is gripped, the conductor 30 for detecting the electrostatic capacity of the person is detected on the back of the handle 28 by the hand, and the control device 38 detects that the person grips the handle 28. Send a signal to. In response to the signal, the control device 38 rotates the motor 32 of the drive device 24 to the left, decelerates by the spur gears 34 and 35, and the output gear 36, and pushes the pushing member 26 forward. Then, the pushing member 26 opens the door 20. This state is shown in Fig. 4 (C).
Shown in.

Next, in FIG. 4 (C), after the door 20 is opened, the motor 32 is stopped and then the motor 32 is rotated rightward so that the pushing member 26 is in its original position, that is, in FIG. 4 (A). Return to the state. By this operation, when the person closes the door 20 of the refrigerating room by hand, the pushing member 26 does not become an obstacle.

As described above, in the refrigerator door opening device of this embodiment, the freezing compartment door 19 and the refrigerating compartment door 20 are opened inside the partition 16 which divides the freezing compartment 17 and the refrigeration compartment 18. The driving device 24 is provided, and the driving device 24 includes one motor 32 that is operated based on an opening signal, and two pushing members 25 and 26 that are driven by the motor 32. The door 19 of the freezer compartment and the door 20 of the refrigerator compartment in the closed state are pushed out by the pushing members 25, 2
It is opened by pressing force of 6, and when two doors are opened by this, two drive devices are not required,
It is possible to reduce the storage space for the drive device at low cost.

The handles 27, 28 of the doors 19, 20 are also provided.
The conductors 29 and 30 for detecting the electrostatic capacitance of the human body are provided on the back surface of the human body in a portion that is touched by the hand, and an opening signal from the conductors 29 and 30 is input, and the drive device 24 is driven based on the opening signal. Since the device 38 is provided, it is possible to provide a door opening switch that releases the closed state of the door without hindering the person's natural door opening operation. The conductors 29 and 30 are provided on the back surfaces of the handles 27 and 28, so that careless contact is avoided. For this reason, it is possible to prevent a person's natural door opening operation from being hindered and also prevent a malfunction.

(Second Embodiment) FIG. 5 is a perspective view of a refrigerator door opening device according to a second embodiment of the present invention. FIG. 6 is a sectional view of the refrigerator door opening device according to the embodiment. FIG. 7 is a sectional view of a refrigerator handle according to the embodiment. 5 to 7, 39 is a refrigerator body, 40 is a double door type freezer compartment door, and 41 is a double door type refrigerator room door. 42
Is a rod-shaped handle of the door 40, and is attached to the upper and lower parts 4
It is fixed at 3,44. Reference numeral 45 denotes a rod-shaped handle of the door 41, which is fixed to the top and bottom by mounting portions 46 and 47.

The door 40 is supported by a hinge 48 and rotates about the hinge 48. A spring 49 is provided in the door 40 below the hinge 48 so as to bias the door in the opening direction. There is. On the other hand, the door 41 is supported by the hinge 50,
It rotates around this, and a spring 51 as a biasing means is provided in the door 41 below the hinge 50 so as to bias the door 51 in the opening direction of the door. In addition, the driving member 24
Is provided on the top surface of the refrigerator main body 39 on the non-pivotal side of the freezer compartment door 40 and the refrigerating compartment door 41.
Is arranged on the upper end of the freezer compartment door 40, and the pushing member 26 is arranged so as to abut on the upper end of the refrigerating compartment door 41.

Reference numeral 52 is a detection circuit for detecting the electrostatic capacity of a person, which is built in the mounting portion 44 of the handle 42 of the freezer compartment door. Also, the handle 42 is
It is made of an insulating material such as resin, and a conductor 53 for detecting a change in human capacitance is attached to the back surface thereof. Although not shown, the handle 45 of the door of the refrigerator compartment also has a built-in detection circuit inside the mounting portion 47, and the handle 45 is made of an insulating material such as resin, and its rear surface is , A conductor is attached to detect changes in human capacitance.

The operation of the refrigerator door opening device constructed as described above will be described below.

When the handle 42 of the freezer compartment door or the handle 45 of the refrigerator compartment door is grasped, the conductor 53 attached to the back surface of the handle 42, 45 serves as an input portion and is housed in the handle attachment portions 44, 47. The motor 32 in the driving device 24 is operated by being processed by the detection circuit 52.

As for the following operation, as in the case of the first embodiment, when the handle 42 of the freezer compartment door is grasped, the pushing member 25 is pushed forward to open the freezer compartment door 40. On the other hand, when the handle 45 is grasped, the pushing member 26 is pushed forward to open the refrigerator door 41.

As described above, the drive device 24 is used for the door 4 of the freezer compartment.
0 and the refrigerating room door 41 are installed on the top surface of the main body on the non-pivotal side, so that the pushing member 2 is driven by one driving device 24.
Since the doors 5 and 26 can be pressed against the door 40 of the freezing compartment and the door 41 of the refrigerating compartment to open the respective doors, it is possible to inexpensively provide the double door opening device. In addition, the installation of the drive device 24 does not hinder the space inside the refrigerator, and does not lower the heat insulating property by digging the heat insulating wall. Further, the detection circuit 52 is housed in the mounting portions 44 and 47 of the handle 42, and the conductive portion 53 that detects the electrostatic capacitance of a person and the detection circuit 52 are close to each other, which provides stable detection performance with few false detections. Obtainable.

Next, the freezer compartment door 42 and the refrigeration compartment door 45 extruded by the extruding members 25 and 26 have a hinge 48,
The springs 49 and 51 provided below 50 automatically open the spring up to 90 ° by its urging force. For this reason, it is convenient to take items in and out of the refrigerator.

The rod-shaped handles 42 and 45 are extruded from an insulating material such as resin, and the handles 42 and 45 are
A conductor 53 is attached to the back surface of the entire height.
This conductor 53 is configured as a person's electrostatic capacitance detection unit. Accordingly, a person can detect any portion of the rod-shaped handles 42, 45 in the up-down direction, which is convenient. Further, since the conductor 53 that detects the electrostatic capacitance of a person is provided only on the back surface of the handle, erroneous detection can be prevented without detecting even if the front surface of the handle is touched by hand.

(Third Embodiment) FIG. 8 is a sectional view of a refrigerator handle according to a third embodiment of the present invention. In FIG.
The rod-shaped handle 54 is made of metal, and the insulating coating 55 is applied to the entire surface from above, and the conductive paint 56 is applied as a conductor to the back surface of the handle 54 in a linear manner from above. I am doing it. The conductive paint 56 is configured as a person's electrostatic capacitance detection unit.

The operation of the refrigerator door opening device constructed as described above will be described below. When a person grips the rod-shaped handle 54, the person touches the part of the conductive paint 56 provided on the back surface of the handle 54, and as a result, the capacitance of the person is detected. At this time, even if the handle 54 itself is made of metal, since the insulating coating 55 is applied, it is possible to prevent erroneous detection without accidentally detecting human contact. Also, a metal handle can be used, which increases the degree of freedom in design.

[0053]

As described above, according to the first aspect of the invention, in a refrigerator provided with a plurality of doors for opening and closing a plurality of storage chambers partitioned by a partition, one refrigerator operated based on an opening signal is used. The motor and the rotational force of this motor are reduced
One drive unit equipped with a gear to be driven and two pushing members with a rack that meshes with the gear is installed inside the partition, and the gear and the rotor are rotated by reversing the rotation direction of the motor.
Alternate the two extruding members through the engagement of the hooks
Since the plurality of doors that are pushed out and closed are opened by the pushing force of the pushing member, when the plurality of doors are opened, the cost can be reduced and the storage space for the drive device can be reduced.

Further, the invention according to claim 2 is such that a double door is opened, one motor is operated based on an opening signal, a gear for reducing the rotational force of the motor, and a gear meshing with the gear.
One drive with two push-out members carved with racks to be fitted is installed on the refrigerator body above or below the door on the non-pivotal side of the double door and
By reversing operation, the two can be
The push-out members are alternately pushed out to open the double doors in the closed state by the pushing pressure of the push-out members, so when the double doors are opened, it is low cost and waste of the storage space due to the installation of the drive device and heat insulation. It is also possible to prevent deterioration of sex.

The invention described in claim 3 is the same as claim 2
A drive source that is operated based on an opening signal in the invention described in claim 1, a drive device that opens the door in a closed state by the pressing force of the pushing member that is driven by the drive source, and a hinge that pivotally supports the door, Since a spring provided in the door below the hinge to move the door in the opening direction is provided, the door is opened up to 90 ° by the urging force of the spring in the opening direction without the need for a human hand, and the door is moved into the refrigerator. It becomes convenient to put in and take out the above items.

The invention described in claim 4 is the same as claim 1
In the invention according to any one of items 1 to 3, a conductor for detecting a capacitance of a human body provided on a portion of the back surface of the handle of the door that is touched by the hand, and a control for operating the drive device with a signal from the conductor. Since the device is provided, it is possible for a person to send a release signal by a natural operation by grasping the handle. Further, since the conductor is on the back surface of the handle, inadvertent contact can be avoided and erroneous detection can be prevented.

According to the invention of claim 5, in the invention of claim 4, the handle is formed of a non-conductive material, and the conductive material is attached to the rear surface over the entire height, so that a person can handle Even if the user holds the position, the conductor can detect the electrostatic capacity of the human body in a natural form, and the driving device can be driven to release the closed state of the door.

According to a sixth aspect of the invention, in the invention of the fourth aspect, the handle is made of metal, and
Insulation coating was given to the front, and a thin conductor was attached to the back over the entire height, so no matter where the person grips the handle, the conductor will detect the electrostatic capacity of the human body in a natural way, The drive device can be driven to release the closed state of the door, and the insulating coating can prevent accidental erroneous detection.

The invention described in claim 7 is from claims 4 to 6.
In the invention described in any one of the above items, the detection circuit for detecting the electrostatic capacity of the human body is housed in the fixed portion of the handle of the door, and the distance between the conductive portion provided in the grip portion of the handle and the detection circuit is Close to each other, making false detection difficult.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a refrigerator including a door opening device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a drive device of the door opening device of the embodiment.

FIG. 3 is a control block diagram of the door opening device of the embodiment.

FIG. 4 is a sectional view showing an operating state of the door opening device of the embodiment.

FIG. 5 is a perspective view of a refrigerator door opening device according to a second embodiment of the present invention.

FIG. 6 is a sectional view of the refrigerator door opening device according to the embodiment.

FIG. 7 is a sectional view of a refrigerator handle according to the embodiment.

FIG. 8 is a sectional view of a handle of a refrigerator according to a third embodiment of the present invention.

FIG. 9 is a perspective view of a refrigerator having a conventional door opening device.

FIG. 10 is a sectional view of a drive device for a conventional door opening device.

[Explanation of symbols]

16 partition 19 Freezer door 20 Refrigerator door 24 Drive 25 Extruded member 26 Extruded member 27, 28 handle 29, 30 Conductor 32 motor (drive source) 38 Control device 40 Freezer compartment door (double door) 41 Refrigerator door (double door) 42, 45 handle 44, 47 mounting part 48, 50 hinges 49, 51 springs 52 detection circuit 53 conductor 54 handle 55 Insulation coating 56 conductor

Claims (7)

(57) [Claims] 1. A partition part for partitioning a refrigerator main body into a plurality of storage chambers, a plurality of doors for opening and closing an opening of the storage chamber, and one motor operated based on an opening signal.
A gear that reduces the rotational force of the motor and a gear that meshes with the gear.
It is composed of one driving device having two pushing members with a rack to be fitted, and the driving device is provided inside the partitioning part, and the rotation direction of the motor is reversed.
Through the engagement of the gear and the rack
2. The door opening device for a refrigerator, characterized in that the push- out members are alternately pushed out to open the plurality of closed doors by the pushing pressure of the push-out members. Wherein the casement door provided in pair in the opening of the storage compartment, one motor which is operated on the basis of a release signal
A gear for decelerating the coater, the rotational force of said motor, said
It comprises one driving device provided with two pushing members carved with a rack that meshes with a gear, and the driving device is provided on the refrigerator body above or below the door on the non-pivotal side of the double door. For reversing the rotation direction of the motor
Through the meshing of the gear and the rack.
A door opening device for a refrigerator, characterized in that two push-out members are alternately pushed out to open the double doors in the closed state by the pushing pressure of the push-out members. 3. A hinge pivotally supporting the casement door, to claim 2, characterized in that it comprises a spring for operating the door provided in the inner door of the lower of the hinge in the opening direction serial
Door opening device for the refrigerator. 4. A handle provided on a part of a door, a conductor provided on a portion of the back surface of the handle that is touched by a hand, for detecting electrostatic capacitance of a human body, and the drive device by an open signal from the conductor. A door opening device for a refrigerator according to any one of claims 1 to 3, further comprising a control device for operating the refrigerator. 5. The door opening device for a refrigerator according to claim 4, wherein the handle is made of a non-conductive material, and a conductive material is attached to the back surface over the entire height. 6. The refrigerator door opening device according to claim 4, wherein the handle is made of metal, an insulating coating is applied to the front surface, and a thin conductor is attached to the rear surface over the entire height. . 7. The door opening device for a refrigerator according to claim 4, wherein a detection circuit for detecting electrostatic capacity of a human body is housed in a fixed portion of a door handle.