JP2009135842A - Movable transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a movable transmission device in a novel structure capable of making the structure simple and compact while restraining noise caused by an interference of a magnetic path upon transmitting a plurality of electric signals. <P>SOLUTION: A pair of coil heads 18a, 18b is composed of first coil members 14a, 14b assembled to a groove section 22 in a core member 12 and second coil members 16a, 16b assembled to an outer-periphery surface 30 of an external wall section 28. In this case, axial end faces 34, 34 and 36, 36 on the opening side of the groove section 22 in the pair of coil heads 18a, 18b are oppositely positioned. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a movable transmission device that is provided between members that are relatively displaced and performs transmission of an electrical signal using electromagnetic induction.

  Conventionally, a movable transmission device has been used as one of means for transmitting an electric signal such as electric power or a signal between members that can be relatively displaced, such as a joint portion of a robot. In general, such a movable transmission device has a pair of coil heads each provided with a coil member inside a core member made of a magnetically permeable material, facing each other with a predetermined gap therebetween so as to be relatively displaceable. Electric signals are transmitted by electromagnetically coupling the members.

  By the way, when transmitting both electric power and signals using such a movable transmission device, or when transmitting signals of two or more channels, a set of coil heads corresponding to the number of electric signals to be transmitted is used. There is a problem in that it is necessary to provide the space efficiency.

  In order to cope with such a problem, for example, Patent Document 1 discloses a movable transmission device in which a core member that transmits electric power and a core member that transmits a signal are arranged on the same central axis. However, in the movable transmission device as described in Patent Document 1, in order to avoid the occurrence of noise due to mutual interference of magnetic paths, a core member that transmits power is connected to a core member that transmits a signal and a shaft. It is still difficult to realize a sufficiently compact size because it needs to be formed large enough not to overlap in the direction. Furthermore, the positioning of the power core member and the signal core member and the positioning of the other core member facing each other must be performed with high accuracy, resulting in an increase in the manufacturing process. there were.

  On the other hand, Patent Document 2 and Patent Document 3 disclose a movable transmission device in which a power coil member and a signal coil member are provided on a common core member. In this way, it is not necessary to provide separate core members for power and signals, so that further compactness can be achieved. However, in the movable transmission device as described in Patent Documents 2 and 3, the generation of noise due to interference between the magnetic flux generated from the power coil member and the magnetic flux generated from the signal coil member is avoided. Therefore, since it is necessary to form a gap such as a groove for separating these magnetic paths between the power coil member and the signal coil member in the core member, it is difficult to realize sufficient compactness. It was. In addition, since special processing and a special mold are required to form the gap, the manufacturing is difficult and the manufacturing cost is increased.

JP-A-9-298121 Japanese Patent Laid-Open No. 7-66057 JP 11-354348 A

  Here, the present invention has been made in the background as described above, and the problem to be solved is to suppress noise caused by magnetic path interference during transmission of a plurality of electric signals. Another object of the present invention is to provide a movable transmission device having a novel structure that can be simplified and made compact.

  Hereinafter, embodiments of the present invention made to solve the above-described problems will be described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible.

  That is, the first aspect of the present invention is a magnetic permeability in which an outer wall portion is formed on the outer peripheral side of the central wall portion, and a groove portion opened on one end surface in the axial direction is formed between the central wall portion and the outer wall portion. While the first coil member is assembled to the groove portion with respect to the core member made of a material, and the second coil member is assembled to the outer peripheral surface of the outer wall portion, a coil head is configured. A pair of heads is used, and the pair of coil heads are arranged on the same central axis, and the axial end surfaces of the opening portions of the groove portions of the core members of the coil heads are positioned to face each other. A pair of the first coil members in the pair of coil heads are coupled in an electromagnetically coupled state, thereby forming a first transmission path for transmitting at least one of electric power and signals. And a pair of the second coil members in the pair of coil heads are coupled in an electromagnetically coupled state to form a second transmission path for transmitting at least one of electric power and signals. The movable transmission device is characterized in that it has the above.

  In the movable transmission device structured according to this aspect, the first transmission path and the second transmission path are configured using a common core member. Thereby, the movable transmission device having a plurality of transmission paths can be realized more compactly. At the same time, since it is not necessary to form a gap such as a groove, the outer diameter of the core member can be reduced, and the compactness can be realized more advantageously, and a simpler configuration can be achieved. The manufacturing efficiency can be improved.

  Furthermore, in this aspect, since both the coil heads are opposed to each other, power and signals can be transmitted, so that physical fitting such as a connector is unnecessary. Thereby, for example, if a movable transmission device having a structure according to the present embodiment is used for electrical connection between substrates, the possibility of physical damage due to repeated connection can be advantageously avoided.

  In particular, in this embodiment, the second coil member is provided on the outer peripheral surface of the core member, so that the magnetic flux generated from the first coil member and the second coil member can be used while using the common core member. Thus, it is possible to transmit an electric signal while suppressing the occurrence of noise while avoiding as much as possible interference with the magnetic flux generated from the magnetic field. That is, in this aspect, the second coil member is provided on the outer peripheral surface of the core member. In other words, the core member is not provided outside the second coil member. As a result, the magnetic permeability on the outside of the second coil member is made smaller than that of the core member, and most of the lines of magnetic force generated from the first coil member do not jump out of the core member to the outside. It is made to pass. As a result, the magnetic field lines generated from the first coil member jump out of the outer wall portion of the core member, wrap around the outside of the second coil member, and interfere with the magnetic field lines generated from the second coil member. Is suppressed.

  At the same time, the inventor of the present application pays attention to the fact that the magnetic field lines generated from the coil member take the shortest path where the magnetic resistance is minimized, and the magnetic field lines generated from the first coil member and passing through the outer wall portion of the core member are It was predicted that it would pass through the inside of the outer wall and hardly pass through the outside of the outer wall. And by using the outside of the outer wall part, which is expected to hardly pass magnetic lines, as the magnetic path of the second coil member, it is possible to use a common core member without forming a special gap such as a groove. This enables transmission while suppressing the generation of noise due to mutual magnetic flux interference. In addition, since the core member is not provided outside the second coil member, the size of the core member can be further reduced, and further downsizing can be achieved.

  According to a second aspect of the present invention, in the movable transmission device according to the first aspect, a circumferential groove as the groove portion is formed on the substantially ring-shaped magnetically permeable material as the central wall portion. The core member is formed with an inner peripheral wall portion of the peripheral groove and an outer peripheral wall portion of the peripheral groove as the outer wall portion, and the first coil member is formed between the inner peripheral wall portion and the outer peripheral wall portion. The core member is assembled to the core member so as to extend in the circumferential direction along the circumferential groove between the opposing surfaces, while the core is configured such that the second coil member extends in the circumferential direction on the outer peripheral surface of the outer peripheral wall portion. It is characterized by being assembled to the member.

  In the movable transmission device having the structure according to this aspect, since the core member has an annular shape, even when the opposed core member is displaced in the circumferential direction, the opening side of the circumferential groove is not provided. By maintaining the opposed state of the end faces in the axial direction, the electromagnetic coupling state between the first and second coil members can be maintained. As a result, it is possible to eliminate the need for circumferential alignment between the coil heads, and to allow relative displacement in the circumferential direction between the opposed core members.

  Note that the first transmission path and the second transmission path may transmit power or may transmit signals. For example, both the first and second transmission paths may be power transmission paths that transmit power, or both the first and second transmission paths may be signal transmission paths that transmit signals. . Preferably, as a third aspect of the present invention, in the movable transmission device according to the first or second aspect, the first transmission path is a power transmission path for transmitting power, A mode is adopted in which the second transmission path is a signal transmission path for transmitting a signal.

  In other words, since the first coil member is provided with the central wall portion and the outer wall portion of the core member on both the inner and outer sides, the first transmission path configured using the first coil member has a core on the outer side. Stable transmission can be performed as compared with the second transmission path configured by using the second coil member exposed to the outside of the member. Therefore, stable transmission can be performed by using the first transmission path as a power transmission path that requires a larger induced electromotive force than the signal.

  According to a fourth aspect of the present invention, in the movable transmission device according to any one of the first to third aspects, the pair of coil heads are arranged to be relatively rotatable around the central axis. , Feature. In the movable transmission device structured according to this aspect, one of the coil heads is attached to one of the members that rotate relative to each other, and the other of the coil heads is attached to the other, so that between the members that rotate relative to each other. Electric power and signal transmission can be performed.

  According to a fifth aspect of the present invention, in the movable transmission device according to any one of the first to fourth aspects, the core members constituting the pair of coil heads are spaced apart from each other. It is characterized by being.

  In the movable transmission device having the structure according to this aspect, it is possible to transmit power and signals in a state where both core members are not in contact with each other. As a result, wear due to rubbing accompanying relative displacement of both core members can be avoided, and therefore, it can be suitably used for a joint portion of a robot. In addition, since power and signals can be transmitted while the core members are not in contact with each other, for example, if a movable transmission device having a structure according to this embodiment is used for connection between substrates, the substrates can be brought into contact with each other. The two substrates can be electrically connected without any trouble, and the possibility of physical damage during the connection can be advantageously reduced.

  According to a sixth aspect of the present invention, in the movable transmission device according to any one of the first to fifth aspects, a noise suppressing coil member is provided on the core member in at least one of the pair of coil heads. It is characterized by that.

  In the movable transmission device structured according to this aspect, a magnetic field that generates a back electromotive force in the transmission line that cancels the noise electromotive force generated in the first transmission line or the second transmission line is used for noise suppression. By causing the coil to be energized, noise generated in the first transmission path and the second transmission path can be further reduced or eliminated with a simple configuration without using a complicated structure such as a filter circuit. I can do it.

  Here, the arrangement position and the number of turns of the noise suppression coil are appropriately determined in consideration of whether the transmission path targeted for noise suppression is the first or the second, the size and frequency of the noise to be suppressed, etc. Is set. For example, the noise suppressing coil may be disposed between the opposed surfaces of the central wall portion and the outer wall portion of the core member in the same manner as the first coil member, or the outer wall of the core member as in the second coil member. You may arrange | position on the outer peripheral surface of a part. For example, the number of turns of the noise suppression coil may be the same as that of the first coil member or the second coil member, or may be more or less. Furthermore, the noise suppression coil does not necessarily have to be wound more than once, and may be wound only, for example, by a half turn.

  According to a seventh aspect of the present invention, in the movable transmission device according to the sixth aspect, the first transmission path is a power transmission path for transmitting power, and the second transmission path is One of the pair of coil heads is a signal transmission path that transmits a signal, and the noise suppression coil member is provided on the outer peripheral surface of the outer wall portion.

  In the movable transmission device structured according to this aspect, the noise electromotive force generated from the first coil member to the second transmission path is reduced by the noise suppressing coil member, and noise mixed in the signal is reduced. It can be reduced. In other words, in this aspect, the first coil member that generates a large induced electromotive force as compared with the second coil member is used as the power transmission path, thereby forming the signal transmission path. Noise electromotive force is likely to occur. Therefore, by providing a coil member for noise suppression corresponding to the second coil member, it is possible to reduce the generation of noise in the second coil member that is likely to generate noise and perform more stable signal transmission. Become.

  According to an eighth aspect of the present invention, in the movable transmission device according to the seventh aspect, in response to a noise electromotive force generated in the signal transmission path along with power transmission through the power transmission path. The noise suppression power supply means is provided, which causes a magnetic field sufficient to generate a back electromotive force in the signal transmission path to reduce the noise electromotive force by energizing the noise suppression coil member. And

  In the movable transmission device structured according to this aspect, noise generated in the signal transmission path is generated by generating a back electromotive force corresponding to the noise electromotive force generated in the signal transmission path in the signal transmission path. It can be advantageously reduced. Here, as the noise suppression power supply means, a noise electromotive force that can be generated in the signal transmission path is measured in advance, and predetermined power may be supplied to the noise suppression coil based on the measured value. Alternatively, the energization amount to the noise suppression coil may be changed according to the noise electromotive force generated in the signal transmission path.

  According to a ninth aspect of the present invention, in the movable transmission device according to any one of the first to eighth aspects, an electromagnetic shielding member is provided outside the core member in at least one of the pair of coil heads. It is characterized by being. According to this aspect, the influence of electromagnetic waves generated from the coil head on other electronic components can be suppressed, and noise received from other electronic components can be reduced, so that transmission and reception of power and signals can be further improved. It can be performed stably.

  According to a tenth aspect of the present invention, in the movable transmission device according to any one of the first to ninth aspects, a low magnetic permeability member is provided outside the core member in at least one of the pair of coil heads. It is characterized by being provided. According to this aspect, the magnetic flux leakage from the core member is suppressed by making the relative permeability around the core member provided with the second coil member sufficiently lower than that of the core member. The possibility that the magnetic flux generated from the interference with the magnetic flux generated from the second coil member can be more advantageously suppressed. Here, as the low magnetic permeability member, for example, a conventionally known member such as polytetrafluoroethylene or epoxy resin can be appropriately employed.

  In this aspect, in the movable transmission device according to the ninth aspect, an aspect in which a low magnetic permeability member is interposed between the core member and the electromagnetic shielding member is suitably employed. . In this way, the eddy current generated in the electromagnetic shielding member by the magnetic flux generated from the coil head can be suppressed, and the magnetic energy of the coil head can be prevented from being absorbed by the eddy current.

  According to an eleventh aspect of the present invention, in the movable transmission device according to any one of the first to tenth aspects, the pair of core members has an annular shape having a through hole penetrating on a central axis. And a pair of third coil members that are inserted over the through holes of the pair of core members and wound around the pair of core members are provided, and a pair of the third coil members is provided. Are connected in an electromagnetically coupled state to form a third transmission path for transmitting at least one of electric power and signals.

  In the movable transmission device structured according to this aspect, the pair of third coil members are electromagnetically coupled using a magnetic path extending in the circumferential direction of the core member. Thereby, it is possible to transmit an electric signal between the pair of third coil members. That is, the magnetic moment in the circumferential direction of the core member is synthesized by the third coil member with respect to the magnetic moment in the axial direction of the core member exerted on the core member by the first coil member and the second coil member. . The first coil member and the second coil member can transmit electric signals by mutual induction using the axial component of the synthesized magnetic moment, and the third coil member It is possible to transmit and receive electrical signals by mutual induction using the circumferential component of the synthesized magnetic moment. As a result, it is possible to configure the first to third transmission paths using a common core member, and to obtain better space efficiency.

  A twelfth aspect of the present invention is a liquid crystal display comprising the cholesteric liquid crystal element and a drive circuit for the cholesteric liquid crystal element in the movable transmission device according to any one of the first to eleventh aspects. A control circuit for mounting one of the pair of coil heads on the device and separately forming the liquid crystal display device and transmitting / receiving a display control signal to / from the drive circuit of the liquid crystal display device; One of the pair of coil heads is mounted on a display control device configured to include a power supply circuit for supplying power, and the first transmission path is a power transmission path for transmitting power. In addition, the second transmission path is a signal transmission path for transmitting a signal.

  In the movable transmission device structured according to this aspect, it is possible to transmit both power and signal to a liquid crystal display device including a cholesteric liquid crystal element using a common core member. As a result, the liquid crystal display device can be further reduced in size. In addition, since the liquid crystal display device and the display control device are electrically connected by causing the pair of coil heads to face each other, the risk of damage due to physical fitting of a connector or the like is reduced and the connection is free. The degree of improvement is also improved and the connection can be made easily.

  In addition, cholesteric liquid crystals have characteristics that can maintain display contents without supplying voltage due to bistability. Therefore, when a signal necessary for rewriting is transmitted using the second transmission path, the power necessary for driving the cholesteric liquid crystal element is also supplied using the first transmission path, thereby Therefore, it is possible to eliminate the need for a built-in power supply in the liquid crystal display and to further reduce the size and power consumption of the liquid crystal display.

  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

  First, FIGS. 1 and 2 show a movable transformer 10 as a movable transmission device according to a first embodiment of the present invention. The movable transformer 10 includes a coil head 18a configured by assembling a power coil 14a as a first coil member and a signal coil 16a as a second coil member to the core member 12; The power coil 14b as one coil member and the signal coil 16b as a second coil member are assembled to each other so that a pair of the coil head 18b and the coil head 18b are opposed to each other.

  The core member 12 constituting the coil head 18a is a so-called pot-type core made of a ferromagnetic material such as ferrite, and has a substantially annular shape as a whole with a through hole 20 penetrating on the central axis. Has been. Furthermore, the core member 12 is formed with a lead groove 22 as a circumferential groove that forms a groove portion that opens on one end face in the axial direction (vertical direction in FIG. 2) and extends over the entire circumference. The bottom wall portion 24 of the lead groove 22, the inner peripheral wall portion 26 as a central wall portion extending over the entire periphery of the lead groove 22, and the outer periphery as an outer wall portion extending over the entire periphery of the lead groove 22 A wall portion 28 is formed. Thus, in the present embodiment, the lead groove 22 is formed between the inner peripheral wall portion 26 and the outer peripheral wall portion 28, in other words, the lead groove 22 is separated on both sides in the radial direction of the inner peripheral wall portion 26. An outer peripheral wall portion 28 is disposed.

  A power wire 14a is formed by winding a lead wire formed of copper or the like in the lead groove 22 a predetermined number of times. Thus, as shown in FIG. 3, the power coil 14 a is assembled to the core member 12 so as to extend in the circumferential direction of the core member 12 along the lead groove 22 between the inner peripheral wall portion 26 and the outer peripheral wall portion 28. It has been. In the present embodiment, the lead wire constituting the power coil 14a is wound directly around the core member 12. For example, the lead wire is wound around a bobbin prepared separately from the core member 12. Then, the power coil 14a may be formed, and the bobbin provided with the power coil 14a may be mounted in the lead groove 22 to assemble the power coil 14a to the core member 12 or the like.

  A signal coil 16a is formed on the outer peripheral surface 30 of the outer peripheral wall portion 28 constituting the outer peripheral surface of the core member 12 by winding a lead wire made of copper or the like a predetermined number of times. . Thereby, as shown in FIG. 3, the signal coil 16 a is assembled on the outer peripheral surface 30 of the core member 12 so as to extend in the circumferential direction of the core member 12.

  FIG. 3 shows a model for clarifying the extending direction of the power coil 14a and the signal coil 16a, and the number of turns of the power coil 14a and the signal coil 16a is required. It can be appropriately set in consideration of transmission characteristics and the like. For example, the power coil 14a and the signal coil 16a may be wound only around a half circumference of the core member 12, or the power coil 14a is wound in layers in the lead groove 22 so that there is almost no gap. It may be turned.

  Next, the coil head 18b will be described. Since the coil head 18b has substantially the same structure as the above-described coil head 18a, members and parts having substantially the same structure as the coil head 18a are denoted by the same reference numerals in the drawing. Detailed description thereof will be omitted.

  In the coil head 18 b, a power coil 14 b having a structure substantially similar to the power coil 14 a in the coil head 18 a is assembled in the lead groove 22 of the core member 12, and the coil head 18 b In addition, a signal coil 16b having substantially the same structure as the signal coil 16a in the coil head 18a is assembled. The number of turns of the power coil 14b and the signal coil 16b can be appropriately set in consideration of the required transmission characteristics and the like, and is not limited at all, and is provided in the coil head 18a. The number of turns may be the same as or different from the number of power coils 14a and signal coils 16a.

  Further, a cancel coil 32 as a noise suppression coil is assembled to the outer peripheral surface 30 of the core member 12 of the coil head 18b. The cancel coil 32 is formed by winding a lead wire formed of copper or the like a predetermined number of times, substantially the same as the signal coil 16b, whereby the cancel coil 32 is formed on the outer peripheral surface of the core member 12. 30 is assembled so as to extend in the circumferential direction of the core member 12. Here, the number of turns of the cancel coil 32 is appropriately set in consideration of a noise electromotive force that may be generated in the signal coil 16b. For example, only one half of the core member 12 may be wound. Then, the core member 12 may be overlapped and wound a plurality of times.

  For example, the coil heads 18a and 18b having such a structure are mounted on one member 33a of members 33a and 33b (see FIG. 4) in which one coil head 18a is rotated relative to each other and the other coil head. 18b is mounted on the other member 33b and is coaxially arranged with the end surfaces of the opening side of the lead groove 22 facing each other with a predetermined distance. As a result, as shown in FIGS. 1 and 2, the end surfaces 34, 34 on the opening side of the inner peripheral wall portions 26, 26 and the end surfaces 36, 36 on the opening side of the outer peripheral wall portions 28, 28 in both the coil heads 18 a, 18 b The coil heads 18a and 18b are opposed to each other in a non-contact state with a predetermined distance in the axial direction of the coil heads 18a and 18b.

  In the movable transformer 10 in this embodiment, for example, as shown in FIG. 4, the lead wire forming the power coil 14a in the coil head 18a is electrically connected to the inverter 38 provided in the member 33a. At the same time, the lead wire forming the signal coil 16a is electrically connected to the communication circuit 40 provided on the member 33a. On the other hand, the lead wire forming the power coil 14b in the coil head 18b is electrically connected to the rectification stabilization circuit 42 provided on the member 33b, and the lead wire forming the signal coil 16b is connected to the member 33b. Is electrically connected to a communication circuit 44 provided in Further, the lead wire forming the cancel coil 32 provided in the coil head 18b is electrically connected to the noise removal circuit 46 provided in the member 33b. Thereby, transmission of electric power and a signal is enabled between the coil head 18a and the coil head 18b.

  First, a transmission path of electric power supplied from the coil head 18a to the coil head 18b will be described. As the inverter 38 to which the power coil 14a of the coil head 18a is connected, for example, a conventionally known inverter of CVCF type or VVVF type can be appropriately employed. Then, a DC voltage of a power supply circuit (not shown) provided on the member 33a is converted into a high frequency voltage by the inverter 38. Here, the frequency (output frequency) of the high-frequency voltage converted by the inverter 38 varies depending on the power to be supplied, the usage environment, etc., but in the present embodiment, it is appropriately set within a range of about 100 Hz to 500 MHz. Has been.

  Then, when the high frequency voltage converted by the inverter 38 is fed to the power coil 14a, a magnetic flux BP (see FIG. 2) that passes through the power coil 14a and changes according to the output frequency is generated. The magnetic flux BP penetrating through the power coil 14a passes through the inner peripheral wall portion 26, the bottom wall portion 24, and the outer peripheral wall portion 28 of the core member 12, and the end surfaces of the inner peripheral wall portion 26 that are opposed to each other. 34 and 34 and the end faces 36 and 36 of the outer peripheral wall portion 28 enter and exit, and are linked to the power coil 14b provided on the opposing coil head 18b. As described above, in the present embodiment, the end surface 34 on the opening side of the inner peripheral wall portion 26 and the end surface 36 on the opening side of the outer peripheral wall portion 28 in the core member 12 are used as transmission and reception surfaces.

  As a result, the power coils 14a and 14b are electromagnetically coupled, and an induced electromotive force is generated in the power coil 14b due to the mutual induction action. The high-frequency voltage supplied to the power coil 14a is converted into the power coil. 14b. In this way, power is transmitted from the power coil 14a to the power coil 14b in a non-contact state. The high-frequency voltage extracted from the power coil 14b is converted to a DC voltage by the rectifying and stabilizing circuit 42 and then supplied to the communication circuit 44, the noise removal circuit 46, and the like. Thus, in this embodiment, a pair of first coil members is configured by the power coils 14a and 14b, and the first transmission path configured by the power coils 14a and 14b supplies power. The transmission line for power transmission is used.

  Next, transmission paths for signals transmitted and received between the coil head 18a and the coil head 18b will be described. First, after a signal generated by a control circuit (not shown) provided on the member 33a is superimposed on a high-frequency voltage by the communication circuit 40 to which the signal coil 16a of the coil head 18a is connected, the signal coil 16a To be supplied. The high-frequency voltage on which the signal is superimposed is generated by the communication circuit 40, and the frequency varies depending on the data size of the signal, the usage environment, etc. It is appropriately set within a range of about 100 Hz to 10 GHz.

  When a high frequency voltage is supplied to the signal coil 16a, a magnetic flux BS (see FIG. 2) that passes through the signal coil 16a and changes according to the output frequency is generated. The magnetic flux BS penetrating the signal coil 16a passes through the outer portion of the outer peripheral wall portion 28 of the core member 12 and the outside of the core member 12, and is also opposed to the end faces 36 and 36 of the outer peripheral wall portion 28 and the outer periphery. The surface 30 enters and exits and interlinks with the signal coil 16b provided on the opposing coil head 18b.

  As a result, the signal coils 16a and 16b are electromagnetically coupled, and an induced electromotive force is generated in the signal coil 16b due to the mutual induction action. The high-frequency voltage supplied to the signal coil 16a is converted into the signal coil. 16b. In this manner, electric power is transmitted from the signal coil 16a to the signal coil 16b in a non-contact state. The signal superimposed on the high-frequency voltage extracted from the signal coil 16b is extracted by the communication circuit 44 and then transmitted to various control circuits (not shown) provided on the member 33b. Thus, in the present embodiment, a pair of second coil members is configured by the signal coils 16a and 16b, and the second transmission path configured by the signal coils 16a and 16b transmits signals. It is a transmission path for signals to be transmitted.

  For example, a signal can be transmitted from the member 33b to the member 33a. In such a case, in contrast to the case where a signal is transmitted from the member 33a to the member 33b as described above, a signal generated by a control circuit (not shown) provided in the member 33b is generated by the communication circuit 44 at a high frequency. After being superimposed on the voltage and transmitted from the signal coil 16b to the signal coil 16a via the core members 12 and 12 in a non-contact state, the signal is extracted from the high-frequency voltage by the communication circuit 40.

  Further, particularly in the present embodiment, the cancel coil 32 provided in the coil head 18b is electrically connected to a noise removal circuit 46 as a noise suppression power supply means provided in the member 33b. The noise removing circuit 46 supplies a predetermined high-frequency voltage having a preset frequency and voltage to the cancel coil 32. Here, the predetermined high-frequency voltage supplied by the noise removal circuit 46 is a back electromotive force that reduces the noise electromotive force generated in the signal coil 16b due to the magnetic flux BP generated by the power coil 14a. A high-frequency voltage that can cause the magnetic flux BC generated in the signal coil 16b by energizing the cancel coil 32 is employed. Further, as the back electromotive force for reducing the noise electromotive force, a high frequency voltage having the same voltage in the opposite phase to the noise electromotive force or a high frequency voltage close to it is desirable. The frequency of the high-frequency voltage supplied to the cancel coil 32 and the preferred value of the voltage are, for example, the frequency of the high-frequency voltage supplied to the cancel coil 32 while measuring the amount of noise mixed in the electrical signal extracted from the signal coil 16b Further, by gradually changing the voltage and measuring the increase or decrease of the noise amount, it is possible to tune to a suitable value.

  As a result, a predetermined high-frequency voltage is supplied from the noise removal circuit 46 to the cancel coil 32, and the magnetic flux BC that passes through the cancel coil 32 and changes according to the output frequency is generated. The magnetic flux BC generated from the cancel coil 32 is linked to the signal coil 16b, so that the signal electromotive force is reduced in the signal coil 16b due to the magnetic flux BP generated from the power coil 14a. Causes an induced electromotive force to be eliminated. As a result, it is possible to reduce or eliminate noise mixed in the signal extracted from the signal coil 16b.

  In the movable transformer 10 having such a structure, by providing the signal coils 16a and 16b on the outer peripheral surface 30 of the core member 12, the magnetic flux BP generated from the power coil 14a and the signal coil Interference with the magnetic flux BS generated from 16a can be reduced as much as possible. That is, in this embodiment, since the core member is not provided outside the signal coils 16 a and 16 b, the relative permeability around the signal coils 16 a and 16 b is sufficiently higher than the relative permeability of the core member 12. Has been made smaller. The magnetic flux BP generated from the power coil 14a cooperates with the characteristics of the magnetic field lines taking the shortest path that minimizes the magnetic resistance, so that almost no magnetic flux BP passes through the outer portion of the outer peripheral wall portion 28 of the core member 12. While passing through the inner portion of the wall portion 28, the magnetic flux BS generated from the signal coil 16 a passes through the outer portion of the outer peripheral wall portion 28. Thus, in the movable transformer 10 according to the present embodiment, a gap such as a groove that separates the magnetic path formed by the power coil 14a and the magnetic path formed by the signal coil 16a is not formed in the core member 12. In both cases, it is possible to reduce the interference between the magnetic flux BP that transmits power and the magnetic flux BS that transmits signals as much as possible, and to transmit power and signals while suppressing the generation of noise. As a result, further downsizing of the movable transmission device that transmits power and signals is realized.

  Further, in the present embodiment, the power coils 14a and 14b forming the power transmission path are disposed in the lead groove 22 of the core member 12, so that the cores are formed on both the inner and outer sides of the power coils 14a and 14b. An inner peripheral wall portion 26 and an outer peripheral wall portion 28 of the member 12 are disposed. As a result, almost the entire power transmission path that requires a larger magnetic flux than that of signal transmission is formed in the core member 12, and a large amount of magnetic flux is stably secured. The power transmission can be performed stably.

  Furthermore, in the present embodiment, the cancel coil 32 is provided in the coil head 18b, and the magnetic flux generated from the power coil 14a by the high frequency voltage supplied from the noise removal circuit 46 to the cancel coil 32 is used. This can reduce the noise electromotive force generated in the signal coil 16b. As a result, it is possible to more effectively reduce or eliminate noise mixed in a signal extracted from the signal coil 16b with a simple configuration without using a complicated configuration such as a filter circuit. Even when signals are transmitted simultaneously, stable signal transmission / reception can be performed.

  Of course, it is also possible to transmit power and signals in a state where the two coil heads 18a and 18b are in contact with each other in the axial direction. In this way, the end surfaces 34, 34 and 36, 36 serving as the transmitting and receiving surfaces are brought into contact with each other, so that the leakage magnetic flux from the core member 12 can be more effectively suppressed and more stable transmission can be performed. Is possible.

  Next, FIG. 5 shows a movable transformer 60 as a movable transmission apparatus according to the second embodiment of the present invention. In the following description, members substantially the same as those in the above-described embodiment are denoted by the same reference numerals as those in the above-described embodiment, and detailed description thereof is omitted.

  The movable transformer 60 includes coil heads 18a and 18b having a structure substantially similar to that of the first embodiment described above. In particular, in this embodiment, the entire outer peripheral portion excluding the end faces 34 and 36 serving as the transmitting and receiving surfaces in the core member 12 of each of the coil heads 18a and 18b has a substantially bottomed cylindrical shape that opens in one axial direction. The gap member 62 as a magnetic permeability member is covered. Accordingly, the signal coils 16 a and 16 b and the cancel coil 32 provided on the outer peripheral surface 30 of the core member 12 are covered with the gap member 62. Here, as the gap member 62, a conventionally known member having a small relative magnetic permeability can be appropriately employed, and specifically, polytetrafluoroethylene, epoxy resin, or the like is exemplified. More preferably, a non-conductive member is employed as the gap member 62. In the present embodiment, polytetrafluoroethylene is used as the gap member 62.

  Further, in each of the coil heads 18a and 18b, a shield member 64 as an electromagnetic shielding member having a substantially bottomed cylindrical shape opening in one axial direction is provided outside the gap member 62. The shield member 64 is made of a nonmagnetic material such as aluminum or copper. The outer side of the gap member 62 is covered with the shield member 64, so that the outer peripheral portion excluding the end faces 34 and 36 that are the transmitting and receiving surfaces of the core member 12, the outer peripheral portion of the signal coils 16 a and 16 b, and the outer peripheral portion of the cancel coil 32. Is covered with the shield member 64.

  According to the movable transformer 60 having such a structure, an electromagnetic shielding structure is configured by the shield member 64, and the magnetic lines of force that leak from the core member 12 are applied to electronic components and the like provided outside the shield member 64. The risk of influencing and the risk of magnetic lines of force from electronic components provided outside the shield member 64 affecting the electromagnetic induction effects of the power cores 14a and 14b and the signal cores 16a and 16b are reduced.

  Further, by providing the gap member 62 having a low magnetic permeability on the outer peripheral surface 30 of the core member 12, it is more advantageous that the magnetic flux generated from the power coil 14a jumps out of the core member 12. It can be suppressed. Thereby, it can suppress more effectively that the magnetic flux produced | generated from the coil 14a for electric power interferes with the magnetic flux produced | generated from the coil 16a for signals, and can perform more stable transmission.

  Further, particularly in the present embodiment, a gap member 62 is interposed between the core member 12 and the shield member 64, and the gap member 62 is formed of a non-conductive material. As a result, the eddy current is prevented from being generated in the shield member 64 due to the influence of the magnetic lines of force, and the possibility that the magnetic energy of the power coils 14a and 14b and the signal coils 16a and 16b may be reduced by the eddy current is reduced. Has been.

  The gap member 62 and the shield member 64 are not necessarily provided in both the coil heads 18a and 18b, and may be provided only in one of the coil heads 18a and 18b. Further, only one of the gap member 62 and the shield member 64 can be provided. In addition, although the gap member 62 and the shield member 64 in the present embodiment are both in a bottomed cylindrical shape, the bottom portion is not necessarily required, and the gap member 62 and the shield member 64 are opened to both sides in the axial direction. You may make it a shape.

  Next, FIG. 6 shows a movable transformer 70 as a movable transmission apparatus according to the third embodiment of the present invention. In the movable transformer 70, a pair of coil heads 18a and 18b having substantially the same structure as that of the first embodiment described above are opposed to each other with a predetermined distance in the axial direction. And especially in this embodiment, the lead wire formed with copper etc. is penetrated across the through-holes 20 and 20 of both the core members 12 and 12 positioned coaxially, The signal coils 72a and 72b as third coil members are provided by being wound a predetermined number of times across 12. In other words, the core members 12 and 12 of the coil heads 18a and 18b are inserted into the signal coils 72a and 72b. In FIG. 6, for the sake of easy understanding, the number of turns of the signal coils 72a and 72b is less than one turn, but the number of turns of the signal coils 72a and 72b is required transmission characteristics, etc. Can be set appropriately in consideration of, for example, it may be wound several times in layers.

  Here, the movable transformer 70 in this embodiment is mounted on one member 74a of members 74a and 74b (see FIG. 7) in which one coil head 18a and one signal coil 72a are rotated relative to each other, for example. At the same time, the other coil head 18b and the other signal coil 72b are attached to the other member 74b. Thereby, the coil head 18a and the signal coil 72a, and the coil head 18b and the signal coil 72b can be rotated around the central axes of the coil heads 18a and 18b, respectively. In particular, in the present embodiment, the signal coils 72a and 72b are wound without contacting the core member 12, but for example, one of the signal coils 72a is integrally formed therewith. It may be fixed only to the core member 12 of the coil head 18a to be displaced, and the other signal coil 72b may be fixed only to the core member 12 of the coil head 18b to be displaced integrally therewith. Even in this case, the coil head 18a and the signal coil 72a can be rotated around the central axes of the coil heads 18a and 18b with respect to the coil head 18b and the signal coil 72b.

  Then, as shown in FIG. 7, for example, as shown in FIG. 7, the movable transformer 70 in this embodiment includes a lead wire and a signal coil 16a that form the power coil 14a in the coil head 18a. The lead wires to be formed are electrically connected to the inverter 38 and the communication circuit 40 provided on the member 74a, respectively, and the lead wire and the signal coil 16b that form the power coil 14b in the coil head 18b are formed. The lead wires to be connected are electrically connected to the rectifying and stabilizing circuit 42 and the communication circuit 44 provided on the member 74b, respectively. Furthermore, the lead wire forming the signal coil 72a that is displaced integrally with the member 74a is electrically connected to the communication circuit 76 provided on the member 74a, while being displaced integrally with the member 74b. A lead wire forming the signal coil 72b is electrically connected to a communication circuit 78 provided on the member 74b. The communication circuits 76 and 78 have substantially the same structure as the communication circuits 40 and 44 in the first embodiment described above.

  As in the first embodiment described above, power is transmitted between the power coils 14a and 14b and signals are transmitted and received between the signal coils 16a and 16b. In addition, particularly in this embodiment, signals can be transmitted and received between the signal coils 72a and 72b.

  First, a signal generated by a control circuit (not shown) provided on the member 74a by the communication circuit 76 to which the signal coil 72a is connected is superimposed on the high frequency voltage and then supplied to the signal coil 72a. . The high-frequency voltage on which the signal is superimposed is generated by the communication circuit 76, and the frequency varies depending on the data size of the signal, the usage environment, and the like. It is appropriately set within a range of about 100 Hz to 10 GHz.

  When a high frequency voltage is supplied to the signal coil 72a, a magnetic flux that passes through the signal coil 72a and changes according to the output frequency is generated. Here, in the present embodiment, the core members 12 and 12 are inserted into the signal coil 72 a so that substantially all of the magnetic flux passing through the signal coil 72 a passes through the core members 12 and 12. Has been. A closed magnetic circuit is formed by the core members 12 and 12, and the magnetic flux generated in the signal coil 72a is linked to the signal coil 72b extrapolated to the core members 12 and 12. Become. As a result, the signal coils 72a and 72b are electromagnetically coupled, and an induced electromotive force is generated in the signal coil 72b due to the mutual induction action. The high-frequency voltage supplied to the signal coil 72a is converted into the signal coil 72b. Taken from.

  In this way, power is transmitted in a non-contact state from the signal coil 72a to the signal coil 72b. The signal superimposed on the high-frequency voltage extracted from the signal coil 72b is extracted by the communication circuit 78 and then transmitted to various control circuits (not shown) provided on the member 74b. Thus, in the present embodiment, a pair of third coil members is configured by the signal coils 72a and 72b, and the third transmission path configured by the signal coils 72a and 72b transmits signals. It is a transmission path for signals to be transmitted.

  For example, a signal can be transmitted from the member 74b to the member 74a. In such a case, in contrast to the case where a signal is transmitted from the member 74a to the member 74b as described above, a signal generated by a control circuit (not shown) provided in the member 74b is generated by the communication circuit 78 at a high frequency. After being superimposed on the voltage and transmitted from the signal coil 72 b to the signal coil 72 a through the core members 12 and 12 in a non-contact state, the signal is extracted from the high-frequency voltage by the communication circuit 76.

  In the movable transformer 70 having such a structure, the signal coils 72a and 72b are electromagnetically coupled using a magnetic path extending in the circumferential direction of the core member 12, and the signal coils 72a, 72b, It is possible to transmit signals between 72b. That is, with respect to the axial magnetic moment exerted on the core member 12 by the power coil 14 a and the signal coil 16 a extending in the axial direction of the core member 12, the coil core moves in the circumferential direction of the core member 12. A magnetic moment in the circumferential direction of the core member 12 is synthesized by the extending signal coil 72a. An induced electromotive force is generated in the signal coil 72b by the circumferential component of the synthesized magnetic moment, and signals can be transmitted and received between the signal coil 72a and the signal coil 72b. It is. Thereby, in this embodiment, it is possible to form the first to third three transmission paths using the common core member 12, and the power transmission path by the first transmission path; The 2ch signal transmission path by the second and third transmission paths can be compactly formed.

  In the present embodiment, for the sake of easy understanding, the mode excluding the cancel coil 32 in the first embodiment described above is illustrated, but it is of course possible to provide such a cancel coil 32.

  Hereinafter, application examples of the movable transmission apparatus having the structure according to the present invention will be described by taking the movable transformer 10 in the first embodiment as an example. However, it should be understood that the application examples described below are merely examples, and do not indicate that the application examples of the movable transmission device configured according to the present invention are limited to the following.

  For example, a movable transmission device having a structure according to the present invention is preferably applied to a driving device 90 as shown in FIG. The driving device 90 has a structure in which a rotating plate 94 is rotatably attached to a base 92. The base 92 is provided with an electric motor 96, and a rotating plate 94 is attached to an output shaft 98 of the electric motor 96. As a result, the rotating plate 94 can rotate indefinitely around the output shaft 98 with a predetermined distance from the base 92.

  The base 92 is provided with one coil head 18a of the movable transformer 10 in the first embodiment described above, and the rotating plate 94 is provided with the other coil head 18b. Here, both the coil heads 18a and 18b are arranged coaxially with the end faces 34 and 36 facing each other, and the output shaft 98 of the electric motor 96 passes through the coil heads 18a and 18b. The holes 20 and 20 are inserted into the rotating plate 94. Thereby, both the coil heads 18a and 18b can be relatively rotated infinitely around the central axis.

  In this way, power and signals can be transmitted between the base 92 and the rotating plate 94 that are in non-contact with each other and are allowed to rotate indefinitely relative to each other. By using the movable transformer 10 having a structure according to the present invention, it is possible to more compactly configure the electric signal transmission path between the base 92 and the rotating plate 94.

  FIG. 9 shows an application example of the movable transformer 10 in the first embodiment described above to the cholesteric liquid crystal display device 100. The cholesteric liquid crystal display device 100 includes a liquid crystal display 102 as a liquid crystal display device that is formed separately from each other, and supplies power to the liquid crystal display 102 and transmits and receives control signals. And a controller 104 as a display control device for controlling the operation.

  More specifically, a liquid crystal module 106 shown in FIGS. 10 and 11 is accommodated in the liquid crystal display 102. In the liquid crystal module 106, a liquid crystal panel 110 as a cholesteric liquid crystal element is provided on one surface of an insulating substrate 108 formed of, for example, silicon, and the liquid crystal panel 110 is disposed on the opposite surface of the liquid crystal panel 110. Various electronic components such as a drive circuit 112 for controlling the operation of 110 and the rectification stabilization circuit 42 and the communication circuit 44 in the first embodiment described above are provided. In the following description, unless otherwise specified, the front surface refers to the surface on which the liquid crystal panel 110 is provided, and the back surface and the back surface refer to surfaces opposite to the liquid crystal panel 110.

  The liquid crystal panel 110 is a liquid crystal panel using a conventionally known cholesteric liquid crystal, and by using the bistability characteristic of the cholesteric liquid crystal, the display content can be maintained even when no voltage is applied. . The liquid crystal panel 110 includes a scanning driver circuit 114 that sequentially scans row electrodes row by row, and a column electrode corresponding to a desired column on the scanned row electrode based on image data to be displayed. A data driver circuit 116 for applying a voltage is connected. The scan driver circuit 114 and the data driver circuit 116 are electrically connected to a flat cable 118, and the flat cable 118 wraps around the substrate 108 and is provided on the surface of the substrate 108 opposite to the liquid crystal panel 110. By being connected to the connector 120, it is electrically connected to the drive circuit 112 and the like.

  The coil head 18b in the first embodiment described above is provided at the corner on the same surface of the substrate 108 as the liquid crystal panel 110 (in this embodiment, the lower right corner in FIG. 10). The lead wire forming the signal coil 14 b is electrically connected to the rectification stabilization circuit 42, while the lead wire forming the signal coil 16 b is electrically connected to the communication circuit 44. Further, the above-described noise removal circuit 46 is provided on the substrate 108 and is electrically connected to a lead wire forming the cancel coil 32 provided in the coil head 18b. However, the cancel coil 32 and the noise removal circuit 46 are not necessarily required. In the coil head 18 b, end surfaces 34 and 36 serving as transmission and reception surfaces are exposed to the surface of the liquid crystal display 102 through the opening 124 opened on the surface of the case 122 that accommodates the liquid crystal module 106. Yes.

  On the other hand, the controller 104 has a structure in which a transmitter 128 is connected to the input device 126. The input device 126 includes an input unit 130 configured with a keyboard and buttons capable of inputting numerical values and characters, and a display unit 132 configured with a liquid crystal display panel capable of displaying input contents and various information.

  The input device 126 is supplied with drive power for the input device 126 and also based on input information from the power supply circuit 134 as a power supply circuit for supplying drive power to the liquid crystal display 102 and the input unit 130. A control circuit 136 as a control circuit for controlling the operation of the liquid crystal display 102 is incorporated.

  Further, a transmitter 128 is connected to the input device 126 via a connection cable 138. The transmitter 128 has a grip portion 140 having a substantially rod shape, and a connection cable 138 extends from one end portion of the grip portion 140, while a grip portion is held at the other end portion. An opening 142 is formed which is bent at a substantially right angle from the extending direction of the portion 140 and has a tip opened. The coil head 18a according to the first embodiment described above is disposed in the opening 142 with the end faces 34 and 36 serving as transmission and reception surfaces exposed, and the power coil 14a is formed. The lead wire to be connected is electrically connected to the inverter 38, while the lead wire forming the signal coil 16 a is electrically connected to the communication circuit 40.

  The cholesteric liquid crystal display device 10 having such a structure, when updating the display content of the liquid crystal display 102, inputs appropriate rewrite information to the controller 104, and then the coil head 18a provided in the transmitter 128. And the coil head 18b provided on the liquid crystal display 102 are overlapped to be opposed to each other in the axial direction of both the coil heads 18a and 18b, whereby the end surfaces 34 and 34 and the end surfaces 36 and 36 of both the coil heads 18a and 18b are formed. They are opposed to each other with a predetermined distance from each other.

  Then, when power is supplied from the power supply circuit 134 of the controller 104 through the power coils 14a and 14b, each electronic component such as the drive circuit 112, the scan driver circuit 114, and the data driver circuit 116 of the liquid crystal display 102 can operate. State. Further, a control signal is transmitted from the control circuit 136 of the controller 104 to the drive circuit 112 through the signal coils 16a and 16b. In addition, by supplying a predetermined high-frequency voltage from the noise removal circuit 46 to the cancel coil 32, noise mixed in the control signal transmitted to the drive circuit 112 is reduced. Thereby, the drive circuit 112 displays the target image on the liquid crystal panel 110 by controlling the operations of the scan driver circuit 114 and the data driver circuit 116 based on the received control signal. In this application example, since the cholesteric liquid crystal is used as the liquid crystal panel 110, even if the coil heads 18a and 18b are separated and the supply of power to the liquid crystal display 110 is stopped, the display contents are displayed. Maintained.

  Of course, for example, a control signal for notifying that the rewriting of the liquid crystal panel 110 has been completed can be transmitted from the liquid crystal display 102 to the controller 104. In such a case, contrary to the case where the control signal is transmitted from the controller 104 to the liquid crystal display 102, the control signal generated by the drive circuit 112 of the liquid crystal display 102 is a communication circuit on the liquid crystal display 102 side. After being superimposed on the high frequency voltage at 44 and transmitted to the communication circuit 40 on the controller 104 side via the signal coils 16 b and 16 a, the high frequency voltage is taken out by the communication circuit 40 and transmitted to the control circuit 136. .

  In this way, by using the common core member 12 to transmit both power and signal, the electrical connection between the liquid crystal display 102 and the controller 104 can be made compact. Accordingly, the liquid crystal display 102 can be further reduced in size, and is particularly suitable when the liquid crystal display 102 is configured with a relatively small member size such as a price tag attached to a supermarket shelf. Can be used.

  In addition, since the liquid crystal display 102 and the controller 104 can be electrically connected only by placing both the coil heads 18a and 18b facing each other, the connection can be easily performed. Further, since physical fitting such as a connector is not required, it is possible to reduce the possibility of physical damage to the connection portion by repeated connection. In addition, since both the coil heads 18a and 18b can be relatively displaced in the circumferential direction, it is not necessary to be aware of the circumferential position at the time of connection, and the connection can be made more easily.

  In addition, since the liquid crystal display device 102 in this application example includes a cholesteric liquid crystal as the liquid crystal panel 110, it is possible to maintain display contents without supplying power. Therefore, by using the movable transformer 10 and supplying the electric power necessary for the operation together with the control signal from the outside of the liquid crystal display 102, it is not necessary to incorporate a power supply device in the liquid crystal display 102. Thus, the liquid crystal display 102 can be further reduced in size and power consumption.

  Although some embodiments and application examples of the present invention have been described in detail above, these are merely examples, and the present invention is limited in any way by specific descriptions in the embodiments and application examples. It is not interpreted.

  For example, the signal coils 16a and 16b and the cancel coil 32 do not necessarily have to be wound around the core member 12, but are formed to extend in the circumferential direction around the core member 12 with a predetermined distance therebetween. You may do it.

  Further, the cancel coil 32 is not necessarily provided only on the outer peripheral surface 30 of the core member 12, and may be provided in the lead groove 22, for example. The noise removing circuit 46 is configured to supply a predetermined high-frequency voltage set in advance to the canceling coil 32. For example, the noise removing circuit 46 detects the noise electromotive force generated in the signal coil 16b and detects the noise. Depending on the result, the frequency or voltage of the high-frequency voltage supplied to the cancel coil 32 may be changed.

  Further, the core members 12 and 12 positioned opposite to each other have the same structure and have substantially the same inner diameter and outer diameter, but these dimensions do not necessarily have to be equal to each other. Therefore, it may be made different to such an extent that transmission is not hindered.

  In addition, the core member in the above-described embodiment is a so-called pot-type core having a substantially annular shape, but the core member used in the present invention is not necessarily limited to the pot-type core. For example, FIGS. 13 and 14 show a movable transformer 150 as still another embodiment of the present invention.

  The movable transformer 150 is a coil formed by assembling the power coil 14a as the first coil member and the signal coil 16a as the second coil member to the core member 152 in substantially the same manner as in the previous embodiment. A coil formed by assembling a head 154a, a power coil 14b as a first coil member, a signal coil 16b as a second coil member, and a cancel coil 32 as a noise suppressing coil member on the core member 152 The head 154b is structured to be opposed to each other. Here, in particular, the core member 152 in this embodiment is a so-called E-type core having an E-shaped cross-sectional shape, and protrudes in one of the axial directions (vertical direction in FIG. 14) at the center portion thereof. A central protrusion 156 as a central wall is formed, and an outer wall that protrudes in the same direction as the central protrusion 156 across a lead groove 158 as a groove on both sides of the central protrusion 156 is formed. The outer protrusion 160 is integrally formed.

  The power coils 14 a and 14 b are wound around the central protrusion 156 of the core member 152, whereby the power coils 14 a and 14 b are disposed in the lead groove 158, while the outer surface 162 of the outer protrusion 160. Signal coils 16a and 16b are wound on the outermost peripheral surface of the core member 152 including The cancel coil 32 is wound on the outermost peripheral surface of the core member 152 constituting the coil head 154b. Thus, the coil heads 154a and 154b are configured, and the axial end surfaces 164 on the opening side of the lead grooves 158 in the coil heads 154a and 154b are opposed to each other in the axial direction of the coil heads 154a and 154b.

  In the movable transformer 150 having such a structure, the magnetic flux BP generated from the power coil 14a is prevented from jumping out from the outer surface 162 of the core member 152 in substantially the same manner as in the above embodiment. The magnetic flux BS generated from the signal coil 16 a passes through the outer portion of the outer protrusion 160 while passing through the inner portions of the protrusion 156 and the outer protrusion 160. As a result, interference between the magnetic flux BP generated from the power coil 14a and the magnetic flux BS generated from the signal coil 16a is reduced, and transmission with reduced noise mixing is enabled. Similarly to the above-described embodiment, the magnetic flux generated from the cancel coil 32 reduces the noise electromotive force generated in the signal coil 16b. Thus, the core member used in the present invention is not necessarily limited to the pot-type core, and conventionally known various shapes of core members can be appropriately employed.

  In addition, although not enumerated one by one, the present invention can be carried out in a mode to which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art. It goes without saying that all are included in the scope of the present invention without departing from the spirit of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing for demonstrating the movable transmission apparatus as 1st embodiment of this invention. Sectional explanatory drawing for demonstrating the movable transmission apparatus. Explanatory drawing for demonstrating one side of the coil head which comprises the movable transmission apparatus. FIG. 2 is a block diagram schematically illustrating the movable transmission device. Cross-sectional explanatory drawing for demonstrating the movable transmission apparatus as 2nd embodiment of this invention. Explanatory drawing for demonstrating the movable transmission apparatus as 3rd embodiment of this invention. FIG. 2 is a block diagram schematically illustrating the movable transmission device. The partial cross section explanatory drawing for demonstrating the application example of the movable transmission apparatus of this invention. Explanatory drawing for demonstrating the different application example of the movable transmission apparatus of this invention. Explanatory drawing for demonstrating the surface of the liquid crystal module in the example of application. Explanatory drawing for demonstrating the back surface of the liquid crystal module. FIG. 11 is a block diagram schematically illustrating the application example illustrated in FIG. 10. Explanatory drawing for demonstrating the different aspect of the movable transmission apparatus of this invention. Sectional explanatory drawing for demonstrating the movable transmission apparatus.

Explanation of symbols

10: movable transformer, 12: core member, 14a, b: power coil, 16a, b: signal coil, 18a, b: coil head, 20: through hole, 22: lead groove, 24: bottom wall, 26: inner peripheral wall, 28: outer peripheral wall, 30: outer peripheral surface, 32: cancel coil, 34: end surface, 36: end surface

Claims (12)

  An outer wall portion is formed on the outer peripheral side of the central wall portion, and the groove portion is formed with respect to a core member made of a magnetically permeable material in which a groove portion opened on one axial end surface is formed between the central wall portion and the outer wall portion The coil head is constructed by assembling the first coil member and the second coil member on the outer peripheral surface of the outer wall portion. On the other hand, a pair of the coil heads is used. The coil heads are arranged on the same central axis, and the axial end surfaces on the opening side of the groove portions of the core members of the coil heads are opposed to each other. A pair of first coil members are coupled in an electromagnetically coupled state, thereby forming a first transmission path for transmitting at least one of electric power and signals. A movable transmission characterized in that a second transmission path for transmitting at least one of electric power and a signal is configured by connecting a pair of each of the second coil members in the magnetic head in an electromagnetically coupled state. apparatus.   By forming a circumferential groove as the groove portion on the substantially ring-shaped magnetically permeable material, an inner circumferential wall portion of the circumferential groove as the central wall portion and an outer circumferential wall portion of the circumferential groove as the outer wall portion are formed. The first coil member is assembled to the core member so as to extend in the circumferential direction along the circumferential groove between the opposing surfaces of the inner peripheral wall portion and the outer peripheral wall portion. The movable transmission device according to claim 1, wherein the second coil member is assembled to the core member so as to extend in the circumferential direction on the outer peripheral surface of the outer peripheral wall portion.   The movable type according to claim 1 or 2, wherein the first transmission path is a power transmission path for transmitting power, and the second transmission path is a signal transmission path for transmitting a signal. Transmission equipment.   The movable transmission device according to any one of claims 1 to 3, wherein the pair of coil heads are disposed so as to be relatively rotatable around the central axis.   The movable transmission device according to any one of claims 1 to 4, wherein the core members constituting the pair of coil heads are spaced apart from each other and face each other.   The movable transmission device according to any one of claims 1 to 5, wherein a noise suppressing coil member is provided on the core member in at least one of the pair of coil heads.   The first transmission path is a power transmission path for transmitting power, and the second transmission path is a signal transmission path for transmitting a signal, and at least one of the pair of coil heads The movable transmission device according to claim 6, wherein the noise suppressing coil member is provided on an outer peripheral surface of the outer wall portion.   Corresponding to the noise electromotive force generated in the signal transmission line along with the power transmission through the power transmission line, the counter electromotive force for reducing the noise electromotive force is only generated in the signal transmission line. The movable transmission apparatus according to claim 7, further comprising a noise suppression power feeding unit that causes a magnetic field to be generated by energization of the noise suppression coil member.   The movable transmission device according to claim 1, wherein an electromagnetic shielding member is provided outside the core member in at least one of the pair of coil heads.   The movable transmission device according to claim 1, wherein a low magnetic permeability member is provided outside the core member in at least one of the pair of coil heads.   The pair of core members has a ring shape having a through hole penetrating on the central axis, and is inserted over the through holes of the pair of core members and wound around the pair of core members. A third transmission path for transmitting at least one of electric power and signal is configured by providing a pair of third coil members and connecting the pair of third coil members in an electromagnetically coupled state. The movable transmission device according to any one of claims 1 to 10.   One of the pair of coil heads is mounted on a liquid crystal display device including a cholesteric liquid crystal element and a drive circuit for the cholesteric liquid crystal element, and the liquid crystal display device is formed separately from the liquid crystal display device. One configured by mounting the other of the pair of coil heads on a display control device configured to include a control circuit that transmits and receives display control signals to and from the drive circuit of the display device and a power supply circuit that supplies power The first transmission path is a power transmission path for transmitting power, and the second transmission path is a signal transmission path for transmitting a signal. The movable transmission device according to item.

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