JP2016031191A - Heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably transmit an infrared ray signal to a ventilation device side while reducing the number of components.SOLUTION: A heating cooker includes a front operating portion 10 disposed at a front face side of a body case 2 and operating a heating portion, and is disposed at a lower side of a ventilation device. The front operating portion 10 has a housing 21 provided with an infrared ray transmitting portion 16 transmitting an infrared ray, and an infrared ray transmission unit 30 accommodated in the housing 21 and including a plurality of infrared ray emitters transmitting an infrared ray signal from the infrared ray transmitting portion 16 to the front face of the body case 2. An optical axis La of an infrared ray emitter 31a and optical axes Lb and Lc of infrared ray emitters 31b and 31c are different from each other in a horizontal direction with respect to a direction orthogonal to the front face of the body case 2.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a cooking device that performs infrared communication with a ventilator.

  In recent years, an interlocking system in which a ventilator automatically operates in conjunction with the operation of a heating cooker has been proposed (see, for example, Patent Document 1). Patent Document 1 discloses a cooking device in which an infrared signal transmission unit that transmits an infrared signal is attached to an operation panel located on the front surface of the cooking device, and an infrared signal reception unit is provided on the ventilation device side. . And the infrared signal transmitted from the infrared signal transmission part is reflected by the operator in front of the heating cooker, and is received by the ventilation apparatus side. In this way, since the infrared signal is irradiated to the operator and reflected, it is necessary to cause the infrared signal to reach the receiver of the ventilator even if the operator's standing position changes. Therefore, Patent Document 1 has a structure in which LEDs that transmit infrared rays are arranged on both left and right ends of the operation panel.

Japanese Patent No. 3967652

  However, as in Patent Document 1, when infrared LEDs are mounted at different positions, it is necessary to provide an infrared transmitting portion that transmits infrared rays at a portion corresponding to the mounting position of the infrared LED in the front operation unit. As the score increases, the cleanability deteriorates. On the other hand, when the infrared LEDs are gathered in one place, depending on the operator's standing position, the infrared signal may not be irradiated to the operator and may not be reflected by the operator.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a heating cooker that can reliably transmit an infrared signal to the ventilator while reducing the number of components. It is said.

  The heating cooker of the present invention includes a main body case, a heating unit installed on the upper surface side of the main body case, and a front operation unit that is provided on the front side of the main body case and operates the heating unit. A heating cooker that performs infrared communication with a ventilator, and the front operation unit includes a housing provided with an infrared transmission unit that transmits infrared rays, and is accommodated in the housing. A plurality of infrared light emitters each transmitting an infrared signal to the front surface, and the plurality of infrared light emitters have different optical axes in the horizontal direction relative to the direction perpendicular to the front surface of the main body case. Infrared emitters are included.

  According to the heating cooker of the present invention, the plurality of infrared light emitters are installed so that the directions of the optical axes in the width direction of the main body case are different, so that the infrared light emitters are respectively provided at a plurality of locations on the front operation unit. In addition, since an infrared signal can be transmitted over a wide range without providing an infrared transmission part, the infrared signal can be reliably transmitted to the ventilator even if the operator's standing position is changed while reducing the number of parts. .

It is a front view which shows Embodiment 1 of the heating cooker of this invention. It is an external view which shows an example of the front operation part in the heating cooker of FIG. It is sectional drawing which shows the III-III cross section in the front operation part of FIG. It is a schematic diagram which shows an example of the infrared rays transmission unit in FIG. It is sectional drawing which shows the VV cross section in the infrared rays transmission unit of FIG. It is a schematic diagram which shows an example of the unit board | substrate in the infrared rays transmission unit of FIG. It is a schematic diagram which shows the state which mounted the infrared rays light-emitting body in the unit board | substrate of FIG. It is a perspective view which shows a mode that a light emitting element holder is attached to the unit board | substrate which mounted the infrared rays light emitter of FIG. It is a top view which shows a mode that a light emitting element holder is attached to the unit board | substrate which mounted the infrared rays light emitter of FIG. It is a side view which shows a mode that a light emitting element holder is attached to the unit board | substrate which mounted the infrared rays light emitter of FIG. It is sectional drawing which shows a mode that a light emitting element holder is attached to the unit board | substrate which mounted the infrared rays light emitter of FIG.

  Hereinafter, an embodiment of a heating cooker will be described with reference to the drawings. FIG. 1 is a front view showing Embodiment 1 of the cooking device according to the present invention. The heating cooker 1 of FIG. 1 is a built-in type IH cooking heater that is integrally installed on, for example, a kitchen table KT, and a ventilation device 50 is installed above the heating cooker 1. In addition, in FIG. 1, although the case where the heating cooker 1 is united with the kitchen stand KT is illustrated, it may be mounted on the kitchen stand KT.

  In the heating cooker 1, on the upper surface of the main body case 2, for example, three heating units 3 and a top plate made of an IH heater are installed. Also, on the front surface of the main body case 2, a grill door 4 that is detachably attached to the grill chamber in the main body case 2 and a front operation unit 10 for operating the heating unit 3 and the operation of the grill are arranged. Yes. In FIG. 1, for example, the grill door 4 is disposed on the left side with respect to the center CL in the width direction of the main body case 2, and the front operation unit 10 is disposed on the right side.

  FIG. 2 is an external view showing an example of a front operation unit in the cooking device of FIG. The front operation unit 10 in FIG. 2 includes a power switch 11 for turning on / off the main power, a power lamp 12 that emits light when the power switch 11 is turned on, and outputs of the heating units 3. The heating power adjustment dials 13A to 13C for adjusting the temperature are provided. The heating power adjustment dials 13A to 13C are, for example, push-pull switches, and the heating unit 3 is in an OFF state when the tip portion is located on substantially the same plane as the design surface, and is heated when the tip portion protrudes. Part 3 is turned on. When the thermal power adjustment dials 13A to 13C are in the ON state, when the operator rotates the thermal power adjustment dials 13A to 13C, the thermal power of each heating unit 3 (corresponding to the rotation amount of the thermal power adjustment dials 13A to 13C ( Output) is adjusted. The front operation unit 10 includes a button 15 for performing an operation in the grill room such as turning on an illumination lamp in the grill room, and a high temperature caution lamp unit 14.

  3 is a cross-sectional view showing a III-III cross section in the front operation unit of FIG. In FIG. 3, the front operation unit 10 has a structure in which an operation board 20 electrically connected to the various buttons described above is accommodated in a housing 21. The operation board 20 is electrically or mechanically connected to the various buttons such as the power switch 11 and the heating power adjustment dials 13 </ b> A to 13 </ b> C described above in the housing 21, and performs predetermined processing according to inputs from the various buttons. is there. The housing 21 includes a substrate holder 21 a that holds the operation substrate 20, and a substrate cover 21 b that is attached to the back side of the substrate holder 21 a and covers the operation substrate 20. Then, by fixing the substrate cover 21b to the substrate holder 21a to which the operation substrate 20 is attached, a sealed space is formed in the housing 21, and the operation substrate 20 is accommodated in the sealed space. In the center of the front surface of the housing 21, one infrared transmission portion 16 described later is provided.

  A design panel 22 is attached to the front side of the substrate holder 21a. The substrate holder 21a and the design panel 22 are provided with through holes for inserting the power switch 11, the thermal power adjustment dials 13A to 13C, and the like. It has been. Similarly, a power lamp 12 and a button 15 made of a light transmissive material are attached to the substrate holder 21a and the design panel 22. On the operation board 20, a power LED 20 a that is turned on when the power switch 11 is in an ON state is disposed at a position facing the power lamp 12, and a position indicating the state of the grill room is disposed at a position facing the button 15. Display LEDs 20b and 20c are attached.

  The heating cooker 1 has a function of performing infrared communication with the ventilator 50 installed above shown in FIG. Specifically, as shown in FIG. 3, the front operation unit 10 includes an infrared transmission unit 30 that transmits an infrared signal. The infrared transmission unit 30 is a unit separate from the operation board 20 and is disposed on the back surface of the board holder 21a. An infrared transmitting portion 16 made of a material that transmits infrared light is attached to a position of the substrate holder 21a and the design panel 22 facing the substrate holder 21a. The infrared light emitted from the infrared transmission unit 30 passes through the infrared transmission unit 16 and is emitted to the front of the front operation unit 10.

  On the other hand, the ventilating apparatus 50 in FIG. 1 includes a hood part 51 in which a ventilation fan is accommodated, and a light receiving part 52 that is provided at the top end of the hood part 51 and receives an infrared signal transmitted from the heating cooker 1. Have. The infrared signal transmitted from the front operation unit 10 is reflected by the operator, transmitted to the ventilation device 50 side, and received by the light receiving unit 52. Then, the ventilation device 50 performs control such as starting or stopping the driving of the ventilation fan in accordance with the control information included in the infrared signal.

  4 is a schematic view showing an example of the infrared transmission unit in FIG. 3, FIG. 5 is a cross-sectional view showing a VV cross section in the infrared transmission unit in FIG. 4, and the infrared transmission unit 30 with reference to FIGS. Will be described. As described above, the infrared transmission unit 30 transmits an infrared signal for controlling the operation of the ventilation device 50, and includes a unit substrate 30A and a plurality of infrared light emitters 31a to 31c mounted on the unit substrate 30A. And.

  The infrared light emitters 31a to 31c are made of, for example, a bullet-type LED, and are electrically connected to the light emitting element 31x that emits infrared light, the sealing member 31y that seals the light emitting element 31x, and the light emitting element 31x, A lead wire 31z extending from the sealing member 31y. The plurality of infrared light emitters 31 a to 31 c are arranged linearly along the width direction of the main body case 2, for example. In addition, although illustrated about the case where each infrared rays light-emitting body 31a-31c has the same structure, what is necessary is just to radiate | emit infrared rays, and each may have a different shape.

  FIG. 6 is a schematic diagram showing an example of a unit substrate in the infrared transmission unit of FIG. The unit substrate 30A in FIG. 6 is made of, for example, a glass epoxy substrate, and a predetermined wiring pattern is formed thereon. The unit substrate 30A is formed with a plurality of through holes 30h for inserting the lead wires 31z of the infrared light emitters 31a to 31c. The lead wires 31z of the infrared light emitters 31a to 31c are inserted into the through holes 30h and soldered. Attached. Further, the unit substrate 30A is formed with a mounting hole 32 into which a screw or the like is inserted when fixing to the substrate holder 21a, a positioning hole 33 and a locking hole 34 used for positioning and fixing the light emitting element holder 40. Yes.

  Moreover, as shown in FIGS. 3-5, the infrared rays transmission unit 30 is attached to the unit board | substrate 30A, and the light emitting element holder (LED holder) for the fall prevention etc. by force being added to the infrared rays light emitters 31a-31c. 40. The light emitting element holder 40 has, for example, a rectangular parallelepiped shape, and has a plurality of insertion holes 41 to 43 into which the infrared light emitting bodies 31a to 31c are respectively inserted. The positioning pins 44 are formed in, for example, a cylindrical shape, and are provided on the diagonal lines at the four corners of the light emitting element holder 40. The positioning pins 44 are inserted into the positioning holes 33 of the unit substrate 30A, so that the light emitting element holder 40 is positioned at a predetermined position on the unit substrate 30A. The locking piece 45 is provided with a hook portion at the tip, and is inserted and locked in a locking hole 34 provided in the unit substrate 30A, and the light emitting element holder 40 is fixed to the unit substrate 30A.

  Here, among the plurality of infrared light emitters 31 a to 31 c, the optical axis La of the infrared light emitter 31 a and the optical axes Lb and Lc of the infrared light emitters 31 b and 31 c are in a direction orthogonal to the front surface of the main body case 2. Different from each other in the horizontal direction. Specifically, among the plurality of infrared light emitters 31 a to 31 c, the infrared light emitter 31 a has an optical axis La in a direction orthogonal to the front surface of the main body case 2. On the other hand, the infrared light emitters 31 b and 31 c have optical axes Lb and Lc inclined in the horizontal direction toward the center CL side of the main body case 2. As described above, when the front operation unit 10 is installed on the right side of the main body case 2 (see FIG. 1), the optical axes Lb and Lc are inclined to the left side by a predetermined angle α with respect to the optical axis La. The predetermined angle α can be appropriately set depending on the mounting position of the front operation unit 10 and the installation position of the infrared transmission unit 16 in the front operation unit 10.

  Then, when the operator operates the front operation unit 10 while being positioned in front of the front operation unit 10, the operator is irradiated with an infrared signal emitted along the optical axis La. On the other hand, when the operator stands at the center CL of the main body case 2 and operates the front operation unit 10 with his hand extended, an infrared signal emitted along the optical axis La is emitted from the wrist of the operator to the forearm. At the same time, an infrared signal emitted along the optical axes Lb and Lc is also irradiated to the trunk of the operator. In this way, the infrared signal can be reliably radiated to the operator and reflected to the ventilator 50 side regardless of the standing position of the operator.

  The plurality of infrared light emitters 31a to 31c are linearly arranged in the width direction of the main body case 2, and the infrared light emission located on the center CL side of the main body case 2 among the plurality of infrared light emitters 31a to 31c. When the bodies 31b and 31c have the optical axes Lb and Lc inclined toward the center of the main body case 2, the operator can be irradiated without the optical axes La to Lc intersecting each other.

  Further, the inclination of the optical axes Lb and Lc is formed by pressing the infrared light emitters 31b and 31c so as to be inclined when the light emitting element holder 40 is attached to the unit substrate 30A. Specifically, as shown in FIG. 5, inclined surfaces 42 a and 43 a are formed on the inner walls of the insertion holes 42 and 43 of the light emitting element holder 40 so as to be narrowed from the lower end toward the upper end. When the light emitting element holder 40 is mounted on the unit substrate 30A on which the infrared light emitters 31a to 31c are mounted, the infrared light emitters 31b and 31c are pushed by the inclined surfaces 42a and 43a of the insertion holes 42 and 43, and light is emitted. The axes Lb and Lc are inclined. As described above, since the tilt can be provided when the light emitting element holder 40 is attached, a process for tilting the optical axes Lb and Lc is not necessary in the manufacturing process, and the optical axes Lb and Lc can be tilted efficiently. Can do.

  Furthermore, the light emitting element holder 40 is formed so that the height position Hh is lower than the height position Hc of the light emitting element 31x in the infrared light emitters 31a to 31c when attached to the unit substrate 30A. Thereby, the light emitted from the infrared light emitters 31a to 31c is not shielded by the light emitting element holder 40, and the reduction of the light amount of the infrared signal can be prevented.

  7 is a schematic diagram showing a state in which an infrared light emitter is mounted on the unit substrate of FIG. 6, FIG. 8 is a perspective view showing a state in which a light emitting element holder is attached to the unit substrate on which the infrared light emitter of FIG. 7 is mounted, and FIG. FIG. 10 is a top view showing a state in which the light emitting element holder is attached to the unit substrate on which the infrared light emitter shown in FIG. 7 is mounted. FIG. 10 is a side view showing a state in which the light emitting element holder is attached to the unit substrate on which the infrared light emitter is mounted. 11 is a cross-sectional view showing a state in which the light emitting element holder is attached to the unit substrate on which the infrared light emitter shown in FIG. 7 is mounted. An example of assembling the infrared light emitting unit 30 will be described with reference to FIGS. First, as shown in FIG. 7, the lead wire 31z of the infrared light emitters 31a to 31c is inserted into the through hole 30h of the unit substrate 30A vertically and soldered to the through hole 30h using an automatic insertion machine. A plurality of infrared light emitters 31a to 31c are mounted on the substrate 30A. At this time, the optical axes La to Lc of the plurality of infrared light emitters 31a to 31c are not inclined and are orthogonal to the unit substrate 30A.

  Next, as shown in FIGS. 8 to 11, the positioning pins 44 of the light emitting element holder 40 are inserted into the positioning holes 33 of the unit substrate 30 </ b> A, so that the infrared light emitters 31 a to 31 c and the light emitting element holders 40 have respective parts. Positioning with the insertion holes 41 to 43 is performed. At this time, the infrared light emitters 31b and 31c are pushed by the inclined surfaces 42a and 43a of the insertion holes 42 and 43, and the optical axes Lb and Lc are inclined. Then, the locking piece 45 is inserted and locked in the locking hole 34 of the unit substrate 30A, whereby the light emitting element holder 40 is mounted on the unit substrate 30A. Thereafter, the infrared light emitter 31a is protected by the light emitting element holder 40 in a state where the optical axis La is orthogonal to the unit substrate 30A, and the infrared light emitters 31b and 31c are protected in a state where the optical axes Lb and Lc are inclined. Then, it is attached to the front side of the housing 21 (see FIG. 3).

  According to the above-described embodiment, the plurality of infrared light emitters 31 a to 31 c include infrared light emitters 31 a to 31 a having optical axes La and optical axes Lb and Lc that are different from each other in the horizontal direction with respect to the direction orthogonal to the front surface of the main body case 2. Since 31c is included, it is not necessary to provide the infrared light emitters 31a to 31c and the infrared transmission part 16 at a plurality of locations of the front operation unit 10, respectively, and the infrared signal is reliably transmitted while reducing the number of parts. 50 side can be transmitted. In particular, since the plurality of infrared light emitters 31a to 31c include infrared light emitters 31b and 31c whose optical axes Lb and Lc are inclined toward the center CL of the main body case 2, the operator can operate the front operation unit. When operating 10, the infrared signal can be reliably transmitted to the ventilator side in consideration of being located near the center CL of the main body case 2.

  That is, when the infrared light emitter and the infrared transmission part are provided at the left and right ends of the front operation part as in the conventional case, the number of components in the substrate holder 21a and the design panel is increased, and the design is impaired and the cleaning property is reduced. It will decline. On the other hand, when an infrared signal is transmitted only from one place in a direction orthogonal to the front surface, the infrared signal may not reach the infrared receiving unit of the ventilator depending on the position of the operator.

  Therefore, the front operation unit 10 in FIG. 2 is configured such that infrared signals are emitted from the plurality of infrared light emitters 31 a to 31 c through one infrared transmission unit 16. In particular, it has infrared emitters 31b and 31c whose optical axes Lb and Lc are inclined so that an infrared signal is included toward the center CL of the main body case 2. For this reason, even if the operator is in any standing position, one or more infrared signals among the plurality of infrared signals can reflect the operator and be transmitted to the ventilator 50. Therefore, it is possible to reduce the number of components in the substrate holder 21a and the design panel 22, and it is possible to improve design and cleaning properties.

  Further, in the insertion holes 42 and 43 of the light-emitting element holder 40, when the light-emitting element holder 40 is mounted on the unit substrate 30A, inclined surfaces 42a and 43a that incline the optical axes Lb and Lc are formed. Since the optical axes Lb and Lc can be tilted when the element holder 40 is attached, a process for tilting the optical axes Lb and Lc is not required, and the infrared transmission unit 30 can be manufactured efficiently.

  Further, when the light emitting element holder 40 is formed so as to be at the height position Hh lower than the height position Hc of the light emitting element 31x when attached to the unit substrate 30A, the light emitting element holder 40 is disposed at the light emitting element 31x. It is possible to prevent the infrared rays emitted from the light from being blocked, and to prevent a reduction in the amount of infrared rays emitted toward the operator.

  Further, since the infrared transmission unit 30 is a separate unit from the operation board 20, that is, the unit board 30 </ b> A is a separate body from the operation board 20, from the operation board 20 to the infrared transmission unit 16. An optical path for passing an infrared signal is not required between the two. Therefore, the space in the housing 21 can be used for arrangement of other parts, and the front operation unit 10 can be reduced in size and thickness.

  Further, the plurality of infrared light emitters 31a to 31c are linearly arranged in the width direction of the main body case 2, and the infrared light emission located on the center CL side of the main body case 2 among the plurality of infrared light emitters 31a to 31c. When the bodies 31b and 31c have the optical axes Lb and Lc inclined toward the center of the main body case 2, the operator can be irradiated without the optical axes La to Lc intersecting each other.

  The embodiment of the present invention is not limited to the above embodiment. For example, in the above embodiment, the infrared light emitters 31a to 31c are illustrated as being made of so-called bullet-type LEDs, but may be made of surface-mounted LED elements. Even in this case, among the plurality of infrared light emitters 31a to 31c, there may be infrared light emitters 31a to 31c mounted such that the optical axes Lb and Lc are inclined toward the center CL side of the main body case 2. . Moreover, although the infrared rays transmission unit 30 has illustrated about the case where it has three infrared light-emitting bodies 31a-31c, what is necessary is just to have two or more.

  Further, in the above embodiment, the front operation unit 10 is provided on the right side of the main body case 2 and the optical axes Lb and Lc are inclined to the left side. In this case, the infrared transmission unit 30 described above can be applied, and in this case, the optical axes Lb and Lc are inclined to the right side.

  3 illustrates the case where the infrared transmission unit 30 is provided in the upper part of the front operation unit 10 and substantially in the center. However, the present invention is not limited to this. It may be provided at a height position and a position in the width direction.

  Further, although the case where both the optical axes Lb and Lc have a predetermined angle α is illustrated, it is only necessary that the optical axis Lb and the optical axis Lc are inclined to the center side at different angles. For example, an infrared light emitter having an inclined optical axis may be disposed on the side end side of the main body case 2. Furthermore, in the said embodiment, although the some infrared rays light emitters 31a-31c illustrated about the case where it arranges linearly in the width direction of a main body case, it irradiates infrared rays in the direction different in the width direction of the main body case 2. If so, the height position may be shifted and arranged. Further, the optical axes Lb and Lc may be inclined in the horizontal direction, and may be inclined in the horizontal direction and also in the vertical direction.

  DESCRIPTION OF SYMBOLS 1 Heating cooker, 2 Main body case, 3 Heating part, 4 Grill door, 10 Front operation part, 11 Power switch, 12 Power lamp, 13A-13C Thermal power adjustment dial, 14 High temperature caution lamp part, 15 button, 16 Infrared transmission part 20 operation board, 20a-20c LED, 21 housing, 21a board holder, 21b board cover, 22 design panel, 30 infrared transmission unit, 30A unit board, 30h through hole, 31a-31c infrared emitter, 31x light emitting element, 31y Sealing member, 31z lead wire, 32 mounting hole, 33 positioning hole, 34 locking hole, 40 light emitting element holder, 41 to 43 insertion hole, 42a, 43a inclined surface, 44 positioning pin, 45 locking piece, 50 ventilator , 51 Hood part, 52 Light receiving part, CL Heart, Hc, Hh height position, KT kitchen table, La through Lc optical axis, alpha angle.

Claims (8)

A ventilation case installed on the upper side, comprising a main body case, a heating unit installed on the upper surface side of the main body case, and a front operation unit provided on the front side of the main body case for operating the heating unit; A heating cooker that performs infrared communication between,
The front operation unit is
A housing provided with an infrared transmitting portion that transmits infrared;
An infrared transmission unit including a plurality of infrared emitters housed in the housing and transmitting infrared signals from the infrared transmission part to the front surface of the main body case, respectively.
The heating cooker, wherein the plurality of infrared light emitters include the infrared light emitters having optical axes different from each other in a horizontal direction with respect to a direction orthogonal to the front surface of the main body case.   The cooking device according to claim 1, wherein the plurality of infrared light emitters include the infrared light emitter having an optical axis inclined in a horizontal direction toward a center side of the main body case. The plurality of infrared emitters are arranged linearly in the width direction of the main body case,
The infrared light emitter located on the center side of the main body case among the plurality of infrared light emitters has an optical axis inclined in a horizontal direction toward the center of the main body case. 2. The heating cooker according to 2.   The infrared light emitter having an optical axis in a direction perpendicular to the front surface of the main body case is included in the plurality of infrared light emitters. Cooker. Each of the infrared light emitters includes a light emitting element that emits infrared light, a sealing member that seals the light emitting element, and a lead wire that is electrically connected to the light emitting element and extends from the sealing member;
The infrared transmission unit is
A unit substrate on which the lead wire of the infrared emitter is inserted and mounted;
A plurality of insertion holes into which the plurality of infrared light emitters are respectively inserted, and a light emitting element holder attached to the unit substrate,
The insertion hole of the light emitting element holder is formed with an inclined surface that contacts the infrared light emitter and inclines the optical axis when the light emitting element holder is mounted on the unit substrate. The cooking device according to any one of claims 1 to 4.   The cooking device according to claim 5, wherein the light emitting element holder is formed to have a height lower than a height position of the light emitting element when attached to the unit substrate. An operation board is accommodated on the back side in the housing,
7. The unit board according to claim 5, wherein the unit board is electrically connected to the operation board, is separate from the operation board, and is attached to the front side of the housing. Cooking cooker.   The heating cooker according to any one of claims 1 to 7, wherein one infrared transmission portion is provided at a center of the housing.

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