JPH10163047A - Contactless signal transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contactless signal transmission device enabling both rotation movement and slide movement, and multichanneling. SOLUTION: Grooves 1a, 1b for a first winding and grooves 1c, 1d for a second winding are formed on the surface of an anchoring member 1, and the first winding 2 and the second winding 3 formed of rectangular windings and circular windings respectively are wound. Also grooves 4a, 4b for a third winding and grooves 4c, 4d for a fourth winding are formed on the internal surface of a moving member 4, and the third winding 5 and the fourth winding 6 are placed. And the moving member 4 can be moved on the anchoring member 1. Signals are transmitted by a slide operation at a slide zone, and by a rotary operating at a rotary zone.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact signal transmission device for transmitting a signal without contact between two members relatively moving in a rotational direction and a linear direction.

[0002]

2. Description of the Related Art A print head of a printer, a reading head of a scanner, and the like move while being mounted on a carriage. When transmitting a signal to such a head or receiving a signal from the head, there is a method in which a flexible cable is used to transmit and receive a signal in response to the movement of the head. However, the method of electrically connecting the head with a flexible cable has a problem in that the cable is disconnected after a long use because the cable is used in a bending motion. In addition, there is also a problem that a high mechanical movement of the cable is required for high-speed movement.

To cope with this problem, a method using a rotary transformer is being adopted instead of a method of making direct electrical connection by wires.

FIG. 6 is an explanatory diagram of an example of a rotary transformer. In the figure, 21 is a rotor part, 22 is a rotor part winding, 23
Denotes a stator unit, and 24 denotes a stator unit winding. The rotor winding 22 and the stator winding 24 face each other so as to be wound in a cylindrical shape and electromagnetically coupled. Since the coupling coefficient hardly changes even when the rotor 21 rotates about its central axis as a rotation axis, a fixed size between the rotor winding 22 and the stator winding 24 regardless of the rotation of the rotor 21. Signals can be transmitted.

[0005] Such a rotary transformer is also used in video and audio equipment, but the operation capable of transmitting a signal without contact is usually only in the rotational direction.

On the other hand, there is also known a method of transmitting a signal between members performing a sliding motion without contact. FIG.
FIG. 3 is an explanatory diagram of an example of a sliding transformer. In the figure, 31 is a fixed member, 32 is a fixed side winding, 33 is a moving member, and 34 is a moving side winding. The fixing member 31 is fixed to a mounting member such as a frame (not shown) together with the fixed-side winding. The moving member 33 is provided with a through hole through which the fixed member 31 and the fixed-side winding 32 penetrate, and is movable in the direction of the arrow shown in the figure. The movable member 33 is provided with a movable winding 34, and the movable winding 34 is electromagnetically coupled to the fixed winding 32. Since the length of the fixed winding 32 in the longitudinal direction is sufficiently larger than the length of the fixed winding in the moving direction, even if the moving winding 34 moves, the coupling coefficient hardly changes. Therefore, even if the moving member 33 moves, the signal transmitted between the fixed winding 32 and the moving winding 34 hardly changes.

The above-mentioned conventional rotary transformer and slide type transformer can realize only one channel. Also,
The operation capable of transmitting a signal has been limited to either a rotary motion or a slide motion.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and provides a non-contact signal transmission device capable of performing both rotational motion and slide motion and capable of realizing multiple channels. It is intended to provide.

[0009]

According to a first aspect of the present invention, in a contactless signal transmission device, a circular first winding portion and an opposing member extending in a direction perpendicular to the circumference of the first winding portion. Do 2
A first winding in which a second winding portion having a side is connected in series or in parallel; a third winding portion having a circular shape coaxial with the first winding portion and having a different diameter; A second winding portion having two opposite sides extending in a direction perpendicular to the circumference of the third winding portion and having a fourth winding portion different in length from the first winding portion connected in series or parallel; Having a winding, wherein the first winding and the second winding are relatively movable in a central axis direction,
It is characterized by being relatively rotatable about a central axis.

According to a second aspect of the present invention, in the non-contact signal transmission device according to the first aspect, a plurality of pairs of the first winding and the second winding are provided, and a plurality of pairs of the first winding and the second winding are provided. First
And the third winding portion are arranged in the central axis direction for each pair, and the second and fourth winding portions of a plurality of pairs are arranged at different angles for each pair, so that signals of a plurality of channels are provided. Is transmitted.

According to a third aspect of the present invention, in the non-contact signal transmission device according to the first or second aspect, two opposing sides of the second winding portion have a diameter of the first winding portion. , And two opposing sides of the fourth winding portion are positioned on a line passing through the diameter of the third winding portion.

According to a fourth aspect of the present invention, in the non-contact signal transmission device according to the first or second aspect, two opposing sides of the second winding portion are located close to each other on a cylindrical surface. It is characterized by the following.

[0013]

1 and 2 illustrate a first embodiment of a contactless signal transmission device according to the present invention. FIG. 1A is a side view of a fixing member, and FIG. 1 (B) is FIG.
1A is a cross-sectional view taken along the line BB, FIG. 1C is a perspective view schematically showing a fixed part winding, FIG. 1D is a side view of a moving member, and FIG.
(E) is a sectional view taken along line EE of FIG. 1 (D), FIG. 1 (F) is a perspective view showing an outline of a moving part winding, and FIG. 2 is a perspective view showing a combination of a fixed part and a moving part. In the figure, 1 is a fixing member, 1
a and 1b are grooves for the first winding, 1c and 1d are grooves for the second winding,
2 is a first winding, 2a is a rectangular winding, 2b is a circular winding, 3 is a second winding, 3a is a rectangular winding, 3b is a circular winding, and 4 is a moving member. Reference numerals 4a and 4b denote third winding grooves, 4c and 4d denote fourth winding grooves, 5 denotes a third winding, 5a denotes a rectangular winding part, 5b denotes a circular winding part, and 6 denotes a fourth winding groove. Winding,
6a is a rectangular winding part, and 6b is a circular winding part.

The fixing member 1 is made of, for example, a synthetic resin. As shown in FIGS. 1 (A) and 1 (B),
First winding grooves 1a, 1b and second winding grooves 1c, 1d are formed. The first winding groove 1a is formed in the generatrix direction of the fixing member 1, the first winding groove 1b is formed in the circumferential direction of the fixing member 1, and the base of the first winding groove 1a is the first winding groove. Groove 1
b. Similarly, the second winding grooves 1c and 1d are also formed in the generatrix direction and the circumferential direction, and the base of the second winding groove 1c extends under the winding wound around the first winding groove 1b. It is connected to the second winding groove 1d so as to dive. The first winding groove 1a and the second winding groove 1c are 9
It is formed so as to be located at 0 degrees away from the generatrix direction.

The shape of the winding wound on the fixing member 1 is shown in FIG.
As shown in (C), it is composed of a rectangular winding and a circular winding. The first winding 2 is a rectangular winding 2
a and the circular winding portion 2b, the rectangular winding portion 2a is wound around the first winding groove 1a, and the circular winding portion 2b is wound around the first winding groove 1b. The two windings are connected in series, but may be connected in parallel. Similarly, the second winding 3 also includes a rectangular winding portion 3a and a circular winding portion 3b, and is wound around the second winding grooves 1c and 1d similarly to the first winding 2, and is similarly connected. ing. These windings may be left wound in the respective grooves, but may be filled with, for example, a synthetic resin so that the surface of the fixing member 1 has a smooth cylindrical surface.

The moving member 4 is made of, for example, a synthetic resin, and as shown in FIGS.
Third winding grooves 4a, 4b and fourth winding grooves 4c, 4d are formed. The third winding groove 4a is formed in the generatrix direction of the moving member 4, the third winding groove 4b is formed in the circumferential direction of the moving member 4, and the base of the third winding groove 4a is connected to the third winding groove. Groove 4
b. Similarly, the fourth winding grooves 4c and 4d are also formed in the generatrix direction and the circumferential direction, and the base of the fourth winding groove 4c extends over the winding wound around the third winding groove 4b. It is connected to the fourth winding groove 4d so as to dive. The third winding groove 4a and the fourth winding groove 4c are 9
It is formed so as to be located at 0 degrees away from the generatrix direction.

The shape of the winding wound on the moving member 4 is shown in FIG.
As shown in (F), it is composed of a rectangular winding and a circular winding. The third winding 5 is a rectangular winding 5
a and a circular winding portion 5b, the rectangular winding portion 5a is housed in the third winding groove 4a, and the circular winding portion 5b is
It is housed in the winding groove 4b. The rectangular winding portion 5a is formed in a semicircular shape at the end thereof, avoiding the fixing member 1 so as not to contact the fixing member 1. When there are a plurality of turns, the turns need not necessarily be semicircular in the same direction, and may be wound in two semicircular shapes divided on both sides. The two windings are connected in series, but may be connected in parallel. Similarly, the fourth winding 6
It is composed of a rectangular winding part 6a and a circular winding part 6b.
Like the winding 5, it is housed in the fourth winding grooves 4c and 4d, and is similarly connected. These windings may be housed in their respective grooves and remain fixed with an adhesive or the like, but may be filled with, for example, a synthetic resin so that the inner surface of the moving member 1 has a smooth cylindrical surface. It may be.

The length of the rectangular winding portion 5a of the third winding 5 and the rectangular winding portion 6a of the fourth winding 6 in the axial direction is equal to the rectangular winding portion 2a of the first winding 2. And the rectangular winding portion 3a of the second winding 3 are formed to be considerably shorter than the length of the rectangular winding portion 3a, and both lengths are designed in accordance with the moving distance in the sliding direction. The diameters of the circular winding portion 5b of the third winding 5 and the circular winding portion 6b of the fourth winding 6 are the same as those of the circular winding portion 2b of the first winding 2 and the second winding 3. It is larger than the diameter of the rectangular winding 3b, thereby enabling the moving member 4 to move around the fixed member 1.

FIGS. 1 (C) and 1 (F) schematically show the winding on the fixed member side and the winding on the moving member side. However, in order to make the figures easier to understand, the number of turns is reduced. However, the number of turns is not limited as shown in the figure, but can be an appropriate number of turns.

FIG. 2 shows a state in which the fixed member 1 and the moving member 4 on which the windings are wound are combined. FIG. 2 shows a state in which the moving member 4 is in a sliding section with respect to the fixed member 1. As shown in FIG. 1A, the sliding section is a section in which the electromagnetic coupling of the circular winding between the fixed member 1 and the moving member 4 is weakened. In this section, signal transmission is performed in the sliding operation. Is possible. In this section, the angular position of the moving member 4 in the rotational direction with respect to the fixed member 1 is the same as the rectangular winding portion 2a of the first winding 2 and the rectangular winding portion 5a of the third winding 5. This is the position where the coupling coefficient of the electromagnetic coupling becomes the maximum value. In this position, the rectangular winding portion 3a of the second winding 3 and the fourth
It is clear that the rectangular winding portion 6a of the winding 6 has the same angular position. Although there may be some deviation in the angular positions, it is preferable that the angular positions be the same in consideration of the condition that the magnitude of the transmitted signal is maximized.

In FIG. 2, when the moving member 4 is moved to the upper right of the figure, the position where the circular winding portion of the fixed member 1 and the circular winding portion of the moving member 4 overlap is the rotary section. 1 (A) is a section in which the first winding groove 1b and the second winding groove 1d are formed. In this section, signals can be transmitted in the rotary operation. In this section, the circular winding part 2b of the first winding 2 and the circular winding part 5b of the third winding 5 overlap, and the circular winding part 3 of the second winding 3
b and the circular winding portion 6b of the fourth winding 6 are overlapped with each other, and are the positions where the coupling coefficient of the electromagnetic coupling between the respective coils becomes the maximum value.

In the rotary section, there is an electromagnetic coupling between the rectangular winding of the moving member 4 and the rectangular winding of the fixed member 1. For example, considering a case where a signal from the circular winding portion 2b of the first winding is received by the circular winding portion 5b of the third winding, the rectangular winding portion 5a has the first winding in half a rotation. The signal from the rectangular winding 2a of the line 2 is added, and in the other half-turn the signal from the rectangular winding 2a of the first winding 2 is reduced. Also, shifted 90 degrees from this, the second
The signal from the rectangular winding 3a of the winding 3 is added or subtracted. Therefore, the electromagnetic coupling coefficient of the circular winding portion is made larger than the electromagnetic coupling coefficient of the rectangular winding portion, so that the influence of the signal transmitted from the rectangular winding portion in the rotary section is reduced. For this purpose, the number of turns of the circular winding portion is increased with respect to the number of turns of the rectangular winding portion.
Alternatively, a method such as increasing the magnetic permeability of the circular winding portion can be adopted.

As described above, the non-contact signal transmission device of this embodiment is capable of transmitting two channels of signals to the rotary operation, and at a predetermined rotational position, to the two channels of the slide operation. Can be transmitted. For the rotary operation and the sliding operation, a guide mechanism for regulating the moving position of the moving member 4 with respect to the fixed member 1 may be provided to allow a predetermined operation.

The present invention is not limited to two channels. Also in this embodiment, if only one winding is used for the fixed member 1 and the moving member 4, a one-channel non-contact signal transmission device is obtained. Further, by providing three or more windings on the fixed member 1 and the moving member 4, a non-contact signal transmission device with three or more channels can be configured. For example, in the case of a three-channel non-contact signal transmission device, three circular winding portions are installed in the axial direction so that a crosstalk with an adjacent channel can be substantially separated.
The two rectangular windings are arranged at an angle of 60 degrees. When two rectangular winding portions are arranged at an angle of 90 degrees, crosstalk with another channel does not matter. On the other hand, in the case of 60 degrees, crosstalk that cannot be ignored occurs, but since it is smaller than the target signal component, it is possible to take out a desired signal in a circuit or separate the crosstalk component. is there.

Although the moving member is moved outside the fixed member, the moving member may be moved inside the fixed member. Also, the example has been described in which the moving part and the rotating part are established only at different positions, but if the moving part coil and the rotating part coil are alternately arranged, movement and rotation can be performed at any position.

FIG. 3 is a view for explaining a second embodiment of the non-contact signal transmission device of the present invention. FIG. 3 (A) is a perspective view showing a combination of a fixed portion and a moving portion, and FIG. FIG. 3B is a perspective view schematically showing a fixed part winding, and FIG. 3C is a perspective view schematically showing a moving part winding. In the figure, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted. FIG.
The number of turns of the winding in (B) and (C) is as shown in FIG.
As in (F), the figure is shown with a small number of turns to make the figure easier to see. In the first embodiment, two sides parallel to the axial direction of the rectangular winding portion are located on a line passing through the diameter of the circular winding portion. Two sides parallel to the axial direction were arranged at close positions on the cylindrical surface, and the two sides parallel to the axial direction of the rectangular winding portion were narrow. The operation is the same as that described in the first embodiment. In this embodiment, since the rectangular winding portion is a rectangular winding having a narrow width on the cylindrical surface, a large number can be arranged side by side on the cylindrical surface, which is advantageous for multi-channel. Although FIG. 3 does not show a groove for accommodating the rectangular winding portion, the groove may not be provided.

FIG. 4 is a circuit diagram for explaining the principle of the method for electrically driving the windings in the contactless signal transmission device. In the figure, 7 and 8 are electric circuits, Lf is a fixed part winding, Lm
Is a moving part winding, Cf and Cm are capacitors, and Rf and Rm are resistors. FIG. 4 shows how a signal is transmitted from the electric circuit 7 to the electric circuit 8 using a non-contact signal transmission device. It is preferable that the coupling coefficient between the fixed part winding Lf and the moving part winding Lm be as close to 1 as possible. Assuming that the frequency of the signal transmitted by this circuit is f, the values of the capacitors Cf and Cm are as follows: f = 1 / 2π (Lf · Cf) ^1/2 = 1 / 2π (Lm · C
m) A value that satisfies ^1/2 . Note that Lf, Lm, Cf, Cm
Are the fixed part winding Lf, the moving part winding Lm, and the capacitor C
f and Cm. The resistances Rf and Rm are adjusted according to the operation purpose. As described above, in the case of multiple channels, the frequency of the signal transmitted for each channel may be changed. Crosstalk can be easily separated. The transmitted signal may be modulated and its carrier frequency may be set to f.

FIG. 5 shows an example of a circuit configuration used for transmitting a digital signal by the non-contact signal transmission device of the present invention. In the figure, 10 and 12 are buffer amplifiers, 11 is a differentiating circuit, 13 is a contactless signal transmission device, 14 is a full-wave rectifier circuit, and 15 is a flip-flop circuit. The rectangular pulse signal input to the buffer amplifier 10 is differentiated by the differentiating circuit 11, amplified by the buffer amplifier 12, and transmitted from the fixed unit side to the moving unit side by the non-contact signal transmission device 13 (the non-contact signal transmission device). A signal may be transmitted from the moving unit side to the fixed unit side, with the left side of 13 as the moving unit side and the right side as the fixed unit side. The output of the non-contact signal transmission device 13 is full-wave rectified by the full-wave rectifier circuit 14, and the flip-flop circuit 15 can obtain a rectangular pulse signal as an output signal.

[0029]

As is apparent from the above description, according to the present invention, a signal can be transmitted in a non-contact manner by both a rotary motion and a slide motion, and a multi-channel non-contact signal transmission device is provided. You can also get Since there is no contact, the cable is not bent unlike the cable connected with the conventional connection cable, etc., and basically only the wear of the contact parts other than the signal transmission part affects the life, so the life is extended. Can be realized.

Further, in a portion where a cable is extended for a long time, an electromagnetic wave is generated depending on the frequency of a signal passing therethrough, which often causes a problem as unnecessary radiation noise from equipment. However, the present invention utilizes electromagnetic coupling by a counter winding as a signal transmission means. Therefore, there is an effect that the inductance of the formed coil is large and unnecessary radio waves are hardly generated.

[Brief description of the drawings]

FIG. 1 is a view for explaining a first embodiment of a non-contact signal transmission device according to the present invention. FIG. 1 (A) is a side view of a fixing member, and FIG. 1 (B) is FIG. 1 (A). 1 (C) is a perspective view schematically showing a fixed part winding, and FIG.
FIG. 1E is a side view of the moving member, and FIG.
FIG. 1F is a perspective view schematically showing a moving part winding.

FIG. 2 is a perspective view in which a fixed unit and a moving unit are combined.

3A and 3B are views for explaining a second embodiment of the non-contact signal transmission device of the present invention. FIG. 3A is a perspective view in which a fixed portion and a moving portion are combined, and FIG. FIG. 3C is a perspective view schematically showing a fixed part winding, and FIG. 3C is a perspective view schematically showing a moving part winding.

FIG. 4 is a circuit diagram for explaining the principle of an electric driving method of a winding in the non-contact signal transmission device.

FIG. 5 is a schematic diagram of an electric circuit when a digital signal is transmitted by the contactless signal transmission device of the present invention.

FIG. 6 is an explanatory diagram of an example of a rotary transformer.

FIG. 7 is an explanatory diagram of an example of a sliding transformer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fixed member, 1a, 1b ... 1st winding groove, 1c, 1d
... Second winding groove, 2 ... First winding, 2a ... Rectangular winding part, 2b ... Circular winding part, 3 ... Second winding, 3a ... Rectangular winding part, 3b ... Circular shape Winding part, 4 ... moving member, 4a,
4b: third winding groove, 4c, 4d: fourth winding groove, 5 ...
Third winding, 5a: rectangular winding part, 5b: circular winding part, 6: fourth winding, 6a: rectangular winding part, 6b: circular winding part, 7, 8: electric circuit , 10, 12 buffer amplifier, 11 differentiation circuit, 13 contactless signal transmission device, 1
4 ... full-wave rectifier circuit, 15 ... flip-flop circuit.

Claims (4)

[Claims] 1. A first winding part having a circular shape and a second winding part having two opposing sides extending in a direction perpendicular to the circumference of the first winding part are connected in series or in parallel. A first winding, a circular third winding part having a diameter different from that of the first winding part and two opposite sides extending in a direction perpendicular to the circumference of the third winding part; A second winding in which a fourth winding having a length different from that of the first winding is connected in series or in parallel, and wherein the first winding and the second winding are connected to each other; A non-contact signal transmission device characterized in that the line is relatively movable in the direction of the central axis and relatively rotatable about the central axis. 2. A plurality of pairs of the first winding and the second winding are provided, and a plurality of pairs of the first and third windings are shifted in a central axis direction for each pair. 2. The non-contact signal transmission according to claim 1, wherein a plurality of pairs of the second and fourth winding units are arranged at different angles for each pair and transmit signals of a plurality of channels. 3. apparatus. 3. Two opposing sides of the second winding part are located on a line passing through a diameter of the first winding part, and two opposing sides of the fourth winding part are The non-contact signal transmission device according to claim 1, wherein the non-contact signal transmission device is located on a line passing through a diameter of the third winding portion. 4. The non-contact signal transmission device according to claim 1, wherein two opposing sides of the second winding portion are located close to each other on a cylindrical surface.