JPWO2009087780A1 - Jaw movement measuring device and sensor coil manufacturing method used therefor - Google Patents

Abstract

An X-axis coil, a Y-axis coil, and a Z-axis coil are arranged at right angles to each other while accurately mass-producing sensor coils efficiently, and the relative positions of the upper jaw and the lower jaw are accurately detected. A jaw movement measuring device detects a relative position of a tooth by detecting an alternating current induced from an exciting coil connected to an alternating current power source with a sensor coil. The exciting coil 1 and the sensor coil 2 include X-axis coils 1a and 2a, Y-axis coils 1b and 2b, and Z-axis coils 1c and 2c wound in directions orthogonal to each other. The measuring device excites the exciting coil 1 with the AC power source 3, and the arithmetic circuit 4 calculates the AC signal induced in the sensor coil 2 to calculate the position of the tooth fixing the sensor coil 2 in three dimensions. Further, the sensor coil 2 including the X-axis coil 2a, the Y-axis coil 2b, and the Z-axis coil 2c includes a loop coil 8 wound in a coil shape and an orthogonal plane 7A of a core material 7 having three planes orthogonal to each other. It is fixed to. [Selection] Figure 11

Description

  The present invention relates to a device for measuring jaw movement and a method of manufacturing a sensor coil used in the device.

  The inventor has developed a device for measuring jaw movement by inducing alternating current from an excitation coil to a sensor coil (see Patent Document 1).

As shown in FIG. 1, this apparatus has an exciting coil 91 rigidly coupled to the teeth of either the upper jaw or the lower jaw, and a rigid body to the teeth of the jaw opposite to the jaw to which the exciting coil 91 is rigidly coupled. A sensor coil 92 to be coupled, an AC power source 93 for passing an alternating current through the exciting coil 91, a signal induced from the exciting coil 91 excited by the alternating current to the sensor coil 92, and a sensor coil 92 for the exciting coil 91 are calculated. And an arithmetic circuit 94 for detecting the relative positions of the upper jaw and the lower jaw from the relative positions of the upper jaw and the lower jaw. The exciting coil 91 and the sensor coil 92 are arranged apart from each other. As shown in FIG. 2, the excitation coil 91 and the sensor coil 92 include three sets of coils 91a, 91b, 91c, (92a, 92b, 92c) wound in directions orthogonal to each other. In this jaw movement measuring device, an AC power source 93 is connected to each of the coils 91 a, 91 b, 91 c of the excitation coil 91, and the AC induced by each of the coils 92 a, 92 b, 92 c of the sensor coil 92 is calculated by the arithmetic circuit 94. The relative position between the lower jaw and the upper jaw is detected by calculation.
2004-229943

  In the jaw movement measuring device of Patent Document 1 previously developed by the present inventor, it is extremely difficult to manufacture an excitation coil and a sensor coil, particularly a sensor coil. This is because, as shown in FIG. 2, it takes time to wind three sets of coils so as to be perpendicular to each other on the surface of a specific solid body that is a sphere. Further, the sensor coil 92 having this structure has a drawback that it is extremely difficult to wind three sets of coils 92a, 92b, and 92c in a posture orthogonal to each other so that the central axes thereof are located on the X axis, the Y axis, and the Z axis. is there. Deviations from the orthogonal postures of the three sets of coils cause detection errors. This is because the relative positions of the lower jaw and the upper jaw in the X, Y, and Z axes are detected three-dimensionally with three sets of coils wound in orthogonal postures. Further, the exciting coil 91 of FIG. 3 has three sets of coils 91a, 91b, 91c wound around the outer periphery of the three surfaces along the outer peripheral edge of the three surfaces gathered at one vertex of the rectangular parallelepiped. The structure of the coil is also very laborious to manufacture. In particular, there is a drawback that it takes much time to wind the coil so as to surround the outside of the three surfaces.

  Furthermore, coils such as an excitation coil and a sensor coil can be directly fixed to the teeth by making them small and light, and this structure can increase the measurement accuracy. However, when the coil is made smaller, the inductance becomes smaller. This is because the inductance decreases as the winding diameter decreases. If the inductance of the coil becomes small, it becomes difficult to achieve high measurement accuracy. This is because as the inductance of the coil decreases, the level of the AC signal induced in the sensor coil decreases in proportion to the inductance. In addition, reducing the size of the coil makes it difficult to accurately arrange the three sets of coils in a posture orthogonal to the X, Y, and Z axes.

  The present invention was developed for the purpose of solving such drawbacks, and an important object of the present invention is to produce an X-axis coil while mass-producing sensor coils simply, easily, efficiently and inexpensively. And a jaw motion measuring device capable of accurately detecting the relative positions of the upper jaw and the lower jaw by arranging the Y-axis coil and the Z-axis coil at right angles to each other, and a method for manufacturing the sensor coil used in the device. There is.

In order to achieve the above object, a jaw movement measuring apparatus according to the present invention comprises the following arrangement.
The jaw movement measuring device includes an excitation coil 1 connected to an AC power source 3, a sensor coil 2 that is rigidly coupled to a tooth and detects an AC induced from the excitation coil 1, and an AC induced by the sensor coil 2. An arithmetic circuit 4 is provided that calculates the relative position of the sensor coil 2 with respect to the excitation coil 1 from the signal and detects the relative position of the teeth that rigidly couple the sensor coil 2. The exciting coil 1 includes an X-axis coil 1a wound in a direction orthogonal to each other, a Y-axis coil 1b, and a Z-axis coil 1c, and the sensor coil 2 is also wound in a direction orthogonal to each other. A coil 2a, a Y-axis coil 2b, and a Z-axis coil 2c are provided. The measuring apparatus excites an exciting coil 1 composed of an X-axis coil 1a, a Y-axis coil 1b, and a Z-axis coil 1c with an AC power source 3, and an X-axis coil 2a, a Y-axis coil 2b of the sensor coil 2, and a Z-axis coil 1c. The arithmetic circuit 4 calculates the AC signal induced in the shaft coil 2c, and three-dimensionally calculates the positions of the teeth for fixing the sensor coil 2 on the X, Y, and Z axes. Further, the measuring apparatus is a core having three planes orthogonal to each other, a loop coil 8 in which a sensor coil 2 composed of an X-axis coil 2a, a Y-axis coil 2b, and a Z-axis coil 2c is wound in advance in a coil shape. The material 7 is fixed to a plane 7A perpendicular to the material 7.
In this specification, a tooth is used in a broad sense including a denture.

  The jaw movement measuring apparatus according to claim 2 of the present invention is configured such that an exciting coil 1 composed of an X-axis coil 1a, a Y-axis coil 1b, and a Z-axis coil 1c has a loop coil 8 wound in a coil shape in advance. The core material 7 having three orthogonal planes is fixed to the orthogonal plane 7A.

  In the jaw motion measuring device according to claim 3 of the present invention, the loop coil 8 is a planar coil wound in a planar shape. Further, in the jaw movement measuring device according to claim 4 of the present invention, the core material 7 is a rectangular parallelepiped. Furthermore, in the jaw movement measuring device according to claim 5 of the present invention, the loop coil 8 is circular.

  In the jaw movement measuring apparatus according to the sixth aspect of the present invention, the excitation coil 1 is rigidly coupled to the upper jaw 11 and the sensor coil 2 is rigidly coupled to the lower jaw 12 to detect the relative positions of the upper jaw 11 and the lower jaw 12. . Further, in the jaw movement measuring apparatus according to claim 7 of the present invention, the sensor coil is rigidly coupled to the upper jaw, and the excitation coil is rigidly coupled to the lower jaw, thereby detecting the relative positions of the upper jaw and the lower jaw.

  The measuring device for jaw movement according to claim 8 of the present invention has a fixed base 20 for fixing the exciting coil 1, and a subject formed by rigidly connecting the sensor coil 2 to the teeth at a fixed position of the fixed base 20. Then, the tooth position is detected by detecting the relative position of the tooth with respect to the fixed base 20. Furthermore, in the jaw movement measuring device according to claim 9 of the present invention, the fixing base 20 has a head fixing mechanism 21 for fixing the head of the subject, and the sensor coil 2 is rigidly coupled to the lower jaw 12 of the subject. Yes.

  In the jaw movement measuring apparatus according to the tenth aspect of the present invention, the sensor coil 2 is directly fixed to the teeth. In the jaw movement measuring apparatus according to claim 11 of the present invention, the exciting coil 1 is directly fixed to the teeth.

  The method for manufacturing a sensor coil according to claim 12 of the present invention includes an exciting coil 1 connected to an AC power source 3, a sensor coil 2 that is rigidly coupled to a tooth and detects an alternating current induced from the exciting coil 1, and the sensor. Jaw movement provided with an arithmetic circuit 4 for calculating the relative position of the sensor coil 2 with respect to the exciting coil 1 from the alternating current signal induced in the coil 2 and detecting the relative position of the teeth that rigidly couple the sensor coil 2 It is a manufacturing method of the sensor coil used for a measuring device. This measuring apparatus includes an X-axis coil 1a, a Y-axis coil 1b, and a Z-axis coil 1c in which an exciting coil 1 is wound in a direction orthogonal to each other, and a sensor coil 2 is also wound in a direction orthogonal to each other. The X-axis coil 2a, the Y-axis coil 2b, and the Z-axis coil 2c. Further, the measuring apparatus excites the exciting coil 1 composed of the X-axis coil 1a, the Y-axis coil 1b, and the Z-axis coil 1c with the AC power source 3, and the X-axis coil 2a of the sensor coil 2, the Y-axis coil 2b, The arithmetic circuit 4 calculates an AC signal induced in the Z-axis coil 2c, and three-dimensionally calculates the positions of the teeth that fix the sensor coil 2 in the X-axis, Y-axis, and Z-axis. Further, in the method of manufacturing the sensor coil, a conductive wire is wound into a coil shape to form three sets of loop coils 8, and the three sets of loop coils 8 are orthogonal surfaces of the core material 7 having three orthogonal surfaces orthogonal to each other. The three loop coils 8 are fixed in a posture orthogonal to each other with the core material 7.

  In the present invention, the central axes of the X-axis coil, the Y-axis coil, and the Z-axis coil are arranged at right angles to each other, while mass-producing sensor coils in a simple, easy and efficient manner at low cost. There is a feature that can accurately detect the relative position of the lower jaw. In particular, the present invention is characterized in that the X-axis coil, the Y-axis coil, and the Z-axis coil are arranged in a posture that is accurately orthogonal to each other while the sensor coil is extremely small, and can be mass-produced at low cost. In the present invention, a loop coil wound in a coil shape in advance is fixed to an orthogonal plane of a core material having three planes orthogonal to each other, and an X-axis coil, a Y-axis coil, and a Z-axis coil This is because the sensor coil becomes. The sensor coil having this structure can be mass-produced at low cost by fixing three sets of loop coils that are mass-produced by a winding machine to a flat surface of a core material separately produced by a method such as molding. In particular, the sensor coil of this structure is such that the X-axis coil, the Y-axis coil, and the Z-axis coil are fixed to the mutually orthogonal planes of the core material so as to be orthogonal to each other. There is no need to wind each coil in a posture orthogonal to each other. This is because the coil can be fixed to the plane of the core material having planes orthogonal to each other, and the center line of the coil can be arranged on the X axis, Y axis, and Z axis. Conventionally, since the center line of each coil is arranged on the X axis, the Y axis, and the Z axis in the step of winding the coil, it is difficult to arrange each coil in a posture that is accurately orthogonal to each other. In contrast, in the present invention, since the right angle posture of the coil is specified by the plane of the core material, the X axis coil, the Y axis coil, and the Z axis coil are set as postures that are orthogonal to the plane of the core material accurately. The center line can be in a posture that is exactly orthogonal. The core material can be in a posture that is exactly perpendicular to the plane by molding or cutting. Moreover, since the loop coil can be mass-produced at low cost separately from the core material by a winding machine, by fixing it to the surface of the core material that can be mass-produced at low cost by a method such as molding, the X-axis coil and Y There is a feature that a sensor coil in which the axial coil and the Z-axis coil are arranged in an accurately orthogonal posture can be mass-produced inexpensively.

  Further, since the sensor coil can be manufactured by manufacturing a loop coil with a winding machine and fixing the loop coil to the plane of the core material, there is a feature that the sensor coil can be made extremely small. In addition, since the wound loop coil is fixed to the surface of the core material, the inductances of the X-axis coil, the Y-axis coil, and the Z-axis coil can be evenly arranged if necessary.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment described below exemplifies a jaw movement measuring device for embodying the technical idea of the present invention and a method of manufacturing a sensor coil used therefor. The measuring device and the manufacturing method of the sensor coil are not specified as follows.

  Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  The jaw movement measuring device shown in FIG. 4 includes an excitation coil 1 and a sensor coil 2 rigidly coupled to upper and lower jaw teeth, an AC power source 3 for passing an alternating current to the excitation coil 1, and an excitation coil 1 excited by an alternating current. A calculation circuit 4 is provided that calculates a signal induced in the sensor coil 2 and detects the relative positions of the upper jaw 11 and the lower jaw 12 from the relative position of the sensor coil 2 with respect to the excitation coil 1. In the illustrated measuring apparatus, the excitation coil 1 is rigidly coupled to the teeth of the upper jaw 11, and the sensor coil 2 is rigidly coupled to the teeth of the lower jaw 12. However, the jaw movement measuring device can also rigidly couple the sensor coil to the maxillary teeth and rigidly couple the excitation coil to the lower jaw teeth. Excitation coil 1 and sensor coil 2 are rigidly connected to the teeth of the jaw via attachment members 5 and 6. However, the excitation coil and the sensor coil can also be fixed to the gums via an attachment member.

  FIG. 5 shows a state where the measuring device shown in FIG. 4 is attached to the subject. In the measuring apparatus shown in this figure, the excitation coil 1 is disposed in front of the upper jaw 11 via the mounting member 5 of the upper jaw 11, and the sensor coil 2 is disposed outside the cheek via the mounting member 6 of the lower jaw 12. Has been established. However, in the measuring apparatus, the excitation coil can be disposed outside the cheek and the sensor coil can be disposed in front of the upper jaw. Furthermore, the measuring device of the present invention does not necessarily need to arrange the exciting coil and the sensor coil at these positions, and may be arranged at a position slightly deviated from the above positions or at positions facing each other. You can also. For example, as shown in FIG. 6, the measuring apparatus of the present invention can also arrange both the exciting coil 1 and the sensor coil 2 in the oral cavity. The exciting coil 1 and the sensor coil 2 arranged in the oral cavity can be directly fixed to teeth and rigidly coupled to the upper jaw 11 and the lower jaw 12. The exciting coil 1 and the sensor coil 2 in FIG. 6 are directly bonded and rigidly bonded to the tooth surface. In particular, the excitation coil 1 and the sensor coil 2 arranged in the oral cavity are preferably arranged inside or outside the front teeth in order to make it easy to measure the movement of the upper and lower jaws. In the measuring apparatus shown in FIG. 6, the exciting coil 1 is rigidly coupled directly to the outside of the front teeth of the upper jaw 11, and the sensor coil 2 is directly rigidly coupled to the inside of the front teeth of the lower jaw 12. In the measurement apparatus of FIG. 6, both the excitation coil 1 and the sensor coil 2 are arranged in the oral cavity, but the measurement apparatus can also arrange only one of the excitation coil and the sensor coil in the oral cavity.

  Further, as shown in FIG. 7, the excitation coil 1 is disposed outside the subject, and the sensor coil 2 is rigidly coupled to both the upper jaw 11 and the lower jaw 12, or the subject is excited as shown in FIG. Fixing the sensor coil 2 so as not to move relative to the coil 1 and rigidly coupling the sensor coil 2 to the lower jaw 12 to detect the relative positions of the lower jaw 12 and the upper jaw 11 in the X, Y, and Z axes. You can also. The measuring apparatus of FIG. 7 includes a fixing base 20 that fixes the excitation coil 1 on the outside of the subject, and a subject formed by rigidly coupling the sensor coil 2 to the teeth of the upper jaw 11 and the lower jaw 12 is provided inside the fixing base 20. Arranged at fixed positions, the relative positions of the teeth of the upper jaw 11 and the lower jaw 12 with respect to the fixed base 20 are detected by the arithmetic circuit 4 to detect the position of the teeth. Further, in the measuring apparatus of FIG. 8, the fixing base 20 includes a head fixing mechanism 21 that fixes the subject's head in a fixed position. In this measuring apparatus, a subject's head is fixed to a fixed position of a fixing base 20 to which the excitation coil 1 is fixed via a head fixing mechanism 21, and the sensor coil 2 is rigidly coupled to the lower jaw 12 of the subject. Yes. This measuring apparatus detects the relative position of the teeth of the lower jaw 12 with respect to the fixed base 20 on which the subject's head is fixed.

  Furthermore, as shown in FIGS. 9 and 10, the exciting coil 1 is arranged outside the subject and in a posture orthogonal to each other so that the central axes thereof are located on the X axis, the Y axis, and the Z axis. You can also. The excitation coil 1 shown in these figures includes a circular air-core coil arranged on the rear surface, right surface, and upper surface of the subject, and an X-axis coil 1a, a Y-axis coil 1b, and a Z-axis coil. 1c. The exciting coil 1 shown in FIG. 9 has an X-axis coil 1a, a Y-axis coil 1b, and a Z-axis coil 1c fixed to the back surface, side surface, and ceiling surface of a rectangular parallelepiped box that is a fixed base 20, and its central axis is It is located on the X axis, Y axis, and Z axis. 10 has an X-axis coil 1a, a Y-axis coil 1b, and a Z-axis coil 1c, which are a fixed base 20, a rear wall surface 20A of the subject, a right wall surface 20B, and an upper top plate 20C. It is fixed to the surface so that its central axis is located on the X, Y, and Z axes. This structure is characterized in that the winding diameter of the exciting coil 1 can be increased, the inductance can be increased, and the strength of the magnetic field generated from the exciting coil 1 can be increased. The exciting coil 1 of FIG. 10 has a fixed base 20 in which three fixed plates are arranged in a posture orthogonal to each other at the rear, right side, and upper side of the subject. The exciting coil 1 can be moved by disassembling and transporting a large fixing base 20 for each fixing plate. However, the exciting coil can also fix the X-axis coil, the Y-axis coil, and the Z-axis coil on the surface of the room wall or ceiling to be measured as a fixed base.

  The measurement apparatus shown in FIGS. 9 and 10 has a subject formed by rigidly coupling the sensor coil 2 to the teeth of the upper jaw 11 and the lower jaw 12 at a fixed position inside the fixed base 20, and the upper jaw 11 with respect to the fixed base 20. The relative position of the teeth of the lower jaw 12 is detected by the arithmetic circuit 4 to detect the position of the teeth. However, the measuring device places the subject having the sensor coil rigidly connected to the lower jaw teeth at a fixed position inside the fixed base, and fixes the subject's head to the fixed base via the head fixing mechanism. It is also possible to detect the relative position of the lower jaw teeth with respect to the fixed base.

  In the measurement apparatus shown in FIGS. 7 to 10, the X-axis coil 1a, the Y-axis coil 1b, and the Z-axis coil 1c are arranged with the excitation coil 1 so that their center axes are orthogonal to each other. However, the measuring apparatus can measure the subject's jaw movement even when the central axes of the X-axis coil, the Y-axis coil, and the Z-axis coil of the exciting coil are slightly deviated from each other. 7 to 10, the exciting coil 1 is arranged so that the central axes of the X-axis coil 1a, the Y-axis coil 1b, and the Z-axis coil 1c intersect at one point. These measuring devices can measure the jaw movement most ideally by placing the subject inside the fixed base 20 so that the sensor coil 2 is positioned in the vicinity of the intersection of the central axes of the exciting coils 1. However, the measuring device can measure the jaw movement of the subject even if the position of the sensor coil fixed to the subject is slightly deviated from the intersection of the central axes of the exciting coils.

  In the jaw movement measuring apparatus shown in FIGS. 4 to 6, the same sensor coil 2 and exciting coil 1 are used. These measuring devices can be used for the exciting coil 1 and the sensor coil 2 by producing the same coil. For this reason, it can be mass-produced efficiently and inexpensively. Further, the sensor coil and the excitation coil can be optimized by changing the wire diameter and the number of turns. For example, a thick wire can be used for the exciting coil to pass a strong current, and a thin wire can be used for the sensor coil to increase the number of turns and increase the sensitivity. As shown in FIGS. 11 and 12, the sensor coil 2 and the excitation coil 1 are composed of X-axis coils 2a and 1a, Y-axis coils 2b and 1b, and Z-axis coil 2c wound in directions orthogonal to each other. 1c. The X-axis coils 2a and 1a, the Y-axis coils 2b and 1b, and the Z-axis coils 2c and 1c are composed of a loop coil 8 wound in a circle by a winding machine, and the loop coil 8 is placed on the surface of the core material 7 The sensor coil 2 and the exciting coil 1 are fixed. The sensor coil 2 shown in FIGS. 7 to 10 has the same structure as the sensor coil 2 shown in FIGS. However, the measuring device can measure the jaw movement of the subject even when the X-axis coil, the Y-axis coil, and the Z-axis coil of the excitation coil and the sensor coil are slightly deviated from each other. The loop coil 8 is manufactured by winding a conductive wire having an insulated surface a plurality of times in a circular shape and fixing it with an adhesive. However, the loop coil does not necessarily have to be wound in a circular shape. For example, the wire may be wound into a polygon a plurality of times and fixed with an adhesive. Furthermore, as shown in FIG. 13, the loop coil 8 can be manufactured by winding it around the outer periphery of a core 9 made of a magnetic material.

  The X-axis coils 2a and 1a, the Y-axis coils 2b and 1b, and the Z-axis coils 2c and 1c have an inductance specified by the number of turns and the winding diameter of the loop coil 8. The X-axis coils 2a and 1a, the Y-axis coils 2b and 1b, and the Z-axis coils 2c and 1c can increase the number of turns of the loop coil 8 and increase the winding diameter to increase the inductance. The loop coil 8 of the exciting coil 1 determines the strength of the magnetic field generated by the inductance, and the strength of the magnetic field generated from the X-axis coil 1a, the Y-axis coil 1b, and the Z-axis coil 1c increases as the inductance increases. The exciting coil 1 having a large inductance increases the magnetic field strength and increases the AC voltage induced in the sensor coil 2. The loop coil 8 of the sensor coil 2 increases the inductance to increase the voltage level of the AC signal induced in the X-axis coil 2a, the Y-axis coil 2b, and the Z-axis coil 2c. When the voltage level of the AC signal induced in the sensor coil 2 is increased, the measurement accuracy for detecting the position of the sensor coil 2 can be increased. Therefore, increasing the inductance of the loop coil 8 serving as the X-axis coil 2a, the Y-axis coil 2b, and the Z-axis coil 2c is effective in increasing the measurement accuracy.

  However, increasing the inductance of the loop coil makes the loop coil larger and heavier. The sensor coil and excitation coil should be small and light. This is because it can be easily attached to the patient and the patient can freely move the jaw in the attached state. In particular, as shown in FIG. 6, it is important that the sensor coil 2 and the excitation coil 1 that are directly bonded to the surface of the tooth in the oral cavity of the subject and are rigidly coupled to the upper jaw 11 and the lower jaw 12 are particularly small. is there. Therefore, the inductance of the loop coil, that is, the number of turns and the winding diameter are set to optimum values in consideration of the position where the sensor coil and the exciting coil are rigidly coupled, the measurement accuracy, and the like. For example, in the sensor coil 2 and the excitation coil 1 that are fixed in the oral cavity, the loop coil 8 has a winding diameter of 10 mm or less, preferably 5 mm or less, and an inductance of about 200 μH or more, preferably 500 μH or more.

  The core material 7 has three planes orthogonal to each other, the loop coil 8 is fixed to the three planes 7A, and the X axis coils 2a and 1a, the Y axis coils 2b and 1b, and the Z axis coil are orthogonal to each other. 2c and 1c are provided. The core material 7 of FIG. 11 is a rectangular parallelepiped, and the loop coil 8 is fixed to three planes 7A of the rectangular parallelepiped that are orthogonal to each other. In order to fix the loop coil 8 at a fixed position, the core material 7 is provided with a recess 7B for inserting the loop coil 8 in a plane as shown in the cross-sectional view of FIG. The recess 7B has the inner shape as the outer shape of the loop coil 8, and the loop coil 8 is fitted and fixed in place. Further, the depth of the recess can be made deeper than the thickness of the loop coil, and the loop coil can be put into the recess so that the loop coil does not protrude from the core material. The core material in which the loop coil is placed in the recess so as not to protrude can be structured to protect the loop coil by coating the surface with the loop coil inserted.

  The sensor coil 2 and the excitation coil 1 that fix the X-axis coils 2a and 1a, the Y-axis coils 2b and 1b, and the loop coil 8 serving as the Z-axis coils 2c and 1c to the rectangular parallelepiped core material 7 make the core material 7 magnetic. As a material, the core material 7 can increase the inductance of the loop coil 8. However, the core material does not necessarily need to be a magnetic material, and a loop coil can be used as an air-core coil as a non-magnetic material such as plastic.

  Moreover, as shown in FIG. 13, the loop coil 8 wound around the core 9 can fix the loop coil 8 in a fixed position by making the inner shape of the recess 7B provided on the plane into a shape in which the core 9 can be fitted.

  Furthermore, the core material 7 shown in FIG. 14 has planes 7A orthogonal to each other arranged in the X-axis direction, and the loop coil 8 is fixed to this plane. The core material 7 in this figure connects three plate materials 10 so as to be orthogonal to each other. The core material 7 fixes a loop coil 8 serving as a Z-axis coil 2c, 1c, X-axis coil 2a, 1a, Y-axis coil 2b, 1b to the core material 7 from left to right in the drawing. The core material 7 can also be provided with a recess 7B in a portion where the loop coil 8 is fixed, and the loop coil 8 can be inserted into the recess 7B and fixed in place.

  The AC power source 3 excites the X-axis coil 1a, the Y-axis coil 1b, and the Z-axis coil 1c of the excitation coil 1 with alternating currents having different frequencies. The AC power supply 3 has built-in oscillating means for exciting the X-axis coil 1a at an angular velocity ω1, the Y-axis coil 1b at ω2, and the Z-axis coil 1c at a frequency ω3. The AC power source 3 can generate alternating currents having different frequencies by a plurality of oscillation circuits, but can also generate sine waves having different frequencies by using a microcomputer and a D / A converter. This AC power supply generates a digital amount of a sine wave by a microcomputer and converts it into an analog amount by a D / A converter.

  The arithmetic circuit 4 calculates the relative position and orientation of the excitation coil 1 and the sensor coil 2 from the alternating current induced by the X-axis coil 2a, the Y-axis coil 2b, and the Z-axis coil 2c of the sensor coil 2, that is, the excitation coil. The relative positions and relative postures of the upper jaw 11 and the lower jaw 12 that rigidly connect the sensor coil 1 and the sensor coil 2 are calculated. The arithmetic circuit 4 calculates the distance and posture of the sensor coil 2 with respect to the excitation coil 1 from the amplitude of the AC signal induced in the X-axis coil 2a, Y-axis coil 2b, and Z-axis coil 2c of the sensor coil 2. The further away the sensor coil 2 is from the exciting coil 1, the smaller the amplitude of the alternating current induced in the X-axis coil 2a, Y-axis coil 2b and Z-axis coil 2c of the sensor coil 2, and the sensor coil 2 with respect to the exciting coil 1 This is because the ratio of the amplitude of alternating current induced in each X-axis coil 2a, Y-axis coil 2b, and Z-axis coil 2c varies depending on the posture. Therefore, the arithmetic circuit 4 determines the magnitude of the amplitude of the AC signal induced in each X-axis coil 2a, Y-axis coil 2b, and Z-axis coil 2c of the sensor coil 2 with respect to the excitation coil 1 of the sensor coil 2. The relative position and relative posture can be calculated.

  The arithmetic circuit 4 calibrates the relative position and relative orientation of the sensor coil 2 and the excitation coil 1, stores the calibration result in the storage circuit, and stores the sensor coil 2 and the excitation coil 1 from the stored calibration data. The position of is calculated. The arithmetic circuit 4 changes the relative position by gradually separating the sensor coil 2 from the excitation coil 1, and further changes the relative posture of the sensor coil 2 with respect to the excitation coil 1 at each relative position. In the posture, the amplitude of the alternating current induced in each X-axis coil 2a, Y-axis coil 2b, and Z-axis coil 2c of the sensor coil 2 is stored in the storage circuit as calibration data. Based on the calibration data, the relative positions of the sensor coil 2 and the excitation coil 1 are determined from the amplitudes of the AC signals induced in the X-axis coil 2a, the Y-axis coil 2b, and the Z-axis coil 2c of each sensor coil 2. And relative posture. Further, when an AC amplitude that is not stored in the calibration data is detected, the arithmetic circuit 4 interpolates the stored calibration data to determine the relative position and relative orientation of the sensor coil 2 with respect to the excitation coil 1. To detect.

  Although not shown, the arithmetic circuit 4 includes an amplifier that amplifies an AC signal induced in each of the X-axis coil 2a, the Y-axis coil 2b, and the Z-axis coil 2c of the sensor coil 2 at a constant amplification factor, and an amplifier. An A / D converter that converts an analog signal output from the digital signal into a digital signal, an arithmetic unit that calculates a signal converted into a digital value by the A / D converter, and a storage circuit that stores calibration data . The memory circuit is guided to the X-axis coil 2a, the Y-axis coil 2b, and the Z-axis coil 2c by changing the relative positions of the exciting coil 1 and the sensor coil 2 and further changing the relative postures at the respective relative positions. AC amplitude is detected, and the detected result is stored as calibration data.

  The arithmetic circuit 4 amplifies the alternating current induced in the X-axis coil 2a, Y-axis coil 2b, and Z-axis coil 2c of the sensor coil 2 to a predetermined amplitude by an amplifier, and converts the amplified analog signal to A / A The digital value is converted by the D converter, and the digital value converted by the computing unit is compared with the calibration data stored in the storage circuit, and the relative position between the exciting coil 1 and the sensor coil 2 is calculated from the nearest calibration data. The relative position and relative attitude are calculated by specifying the relative attitude or interpolating the calibration data. A measuring device that stores calibration data in a storage circuit and calculates the relative position and orientation of the excitation coil 1 and the sensor coil 2 based on the calibration data corrects an error caused by the excitation coil 1 and the sensor coil 2. In other words, the dimensional error, shape error, position error, and the like of the exciting coil 1 and the sensor coil 2 in the manufacturing process are corrected, and the relative position and relative posture of the exciting coil 1 and the sensor coil 2, that is, the upper jaw 11 and the lower jaw 12 are corrected. It is possible to detect the relative position and relative posture of the lens with extremely high accuracy.

  However, the arithmetic circuit 4 uses a mathematical method such as FFT to convert the alternating current induced in the X-axis coil 2a, the Y-axis coil 2b, and the Z-axis coil 2c of the sensor coil 2 regardless of the calibration data. Thus, the relative position and the relative attitude of the sensor coil 2 and the exciting coil 1 can be calculated from the Fourier series. This jaw movement measuring device can detect the relative position and relative posture of the exciting coil 1 and the sensor coil 2 without calibration. Furthermore, the relative position and the relative attitude of the exciting coil 1 and the sensor coil 2 can be calculated by both calibration data and a mathematical method to detect the relative position and the relative attitude with higher accuracy.

The jaw movement measuring device of the present invention can be effectively used for dental prosthesis because it can accurately detect the movement of the lower jaw and the upper jaw and measure the meshing of teeth.

It is a schematic block diagram of the measuring apparatus of jaw movement which this inventor developed previously. It is an expansion perspective view of the exciting coil of the measuring apparatus shown in FIG. It is a perspective view which shows another example of an exciting coil. It is a schematic block diagram of the measuring apparatus of the jaw movement concerning one Example of this invention. It is a schematic perspective view which shows the state which mounts | wears a test subject with the measuring apparatus shown in FIG. It is a schematic block diagram of the measuring apparatus of the jaw movement concerning the other Example of this invention. It is a schematic block diagram of the measuring apparatus of the jaw movement concerning the other Example of this invention. It is a schematic block diagram of the measuring apparatus of the jaw movement concerning the other Example of this invention. It is a schematic block diagram of the measuring apparatus of the jaw movement concerning the other Example of this invention. It is a schematic block diagram of the measuring apparatus of the jaw movement concerning the other Example of this invention. It is an expansion perspective view which shows an example of a sensor coil. It is AA sectional view taken on the line of the sensor coil shown in FIG. It is sectional drawing which shows another example of a sensor coil. It is a perspective view which shows another example of a sensor coil.

Explanation of symbols

1 ... Excitation coil 1a ... X-axis coil
1b ... Y-axis coil
1c ... Z-axis coil 2 ... Sensor coil 2a ... X-axis coil
2b ... Y-axis coil
2c ... Z-axis coil 3 ... AC power supply 4 ... Arithmetic circuit 5 ... Mounting member 6 ... Mounting member 7 ... Core material 7A ... Flat surface
7B ... Recessed portion 8 ... Loop coil 9 ... Core 10 ... Plate material 11 ... Upper jaw 12 ... Lower jaw 20 ... Fixed base 20A ... Wall surface
20B ... Wall surface
20C ... Top plate 21 ... Head fixing mechanism 91 ... Excitation coil 91a ... Coil
91b ... Coil
91c ... Coil 92 ... Sensor coil 92a ... Coil
92b ... Coil
92c ... Coil 93 ... AC power supply 94 ... Arithmetic circuit

Claims (12)

An excitation coil (1) connected to the AC power supply (3), a sensor coil (2) that is rigidly connected to the teeth and detects the AC induced from the excitation coil (1), and an induction to the sensor coil (2) An arithmetic circuit (4) for calculating the relative position of the sensor coil (2) with respect to the excitation coil (1) and detecting the relative position of the teeth that are rigidly coupled to the sensor coil (2) Prepared,
The excitation coil (1) includes an X-axis coil (1a), a Y-axis coil (1b), and a Z-axis coil (1c) wound in directions orthogonal to each other, and the sensor coil (2) is also provided. An X-axis coil (2a) wound in a direction orthogonal to each other, a Y-axis coil (2b), and a Z-axis coil (2c),
The excitation coil (1) composed of an X-axis coil (1a), a Y-axis coil (1b), and a Z-axis coil (1c) is excited by an AC power source (3), and the arithmetic circuit (4) The X-axis coil (2a) of (2), the Y-axis coil (2b), the X-axis of the teeth that fix the sensor coil (2) by calculating the AC signal induced in the Z-axis coil (2c), In a jaw movement measuring device that three-dimensionally calculates the position in the Y-axis and Z-axis,
The sensor coil (2) made up of an X-axis coil (2a), a Y-axis coil (2b), and a Z-axis coil (2c) is crossed perpendicularly to a loop coil (8) wound in a coil shape in advance 3 A jaw movement measuring device characterized by being fixed to a plane (7A) perpendicular to a core member (7) having two planes.   The exciting coil (1) composed of an X-axis coil (1a), a Y-axis coil (1b), and a Z-axis coil (1c) is crossed perpendicularly to a loop coil (8) wound in a coil shape in advance. The jaw movement measuring device according to claim 1, characterized in that it is fixed to an orthogonal plane (7A) of a core material (7) having two planes.   The jaw motion measuring device according to claim 1 or 2, wherein the loop coil (8) is a planar coil wound in a planar shape.   The jaw movement measuring device according to claim 1 or 2, wherein the core material (7) is a rectangular parallelepiped.   The jaw movement measuring device according to claim 1 or 2, wherein the loop coil (8) is circular.   The excitation coil (1) is rigidly coupled to the upper jaw (11), and the sensor coil (2) is rigidly coupled to the lower jaw (12) to detect the relative positions of the upper jaw (11) and the lower jaw (12). The jaw movement measuring device according to claim 1.   The apparatus for measuring jaw movement according to claim 1, wherein the sensor coil is rigidly coupled to the upper jaw and the excitation coil is rigidly coupled to the lower jaw to detect a relative position between the upper jaw and the lower jaw.   A fixed base (20) for fixing the excitation coil (1) is provided, and a test subject formed by rigidly coupling the sensor coil (2) to a tooth is disposed at a fixed position of the fixed base (20), and the fixed base The jaw movement measuring device according to claim 1, wherein the tooth position is detected by detecting a relative position of the tooth with respect to (20).   The said fixing base (20) has a head fixing mechanism (21) which fixes a test subject's head, A sensor coil (2) is rigidly connected with the test subject's lower jaw (12). Jaw movement measuring device.   The jaw movement measuring device according to claim 1, wherein the sensor coil (2) is directly fixed to a tooth.   The jaw movement measuring device according to claim 1 or 10, wherein the exciting coil (1) is directly fixed to a tooth. An excitation coil (1) connected to the AC power supply (3), a sensor coil (2) that is rigidly connected to the teeth and detects the AC induced from the excitation coil (1), and an induction to the sensor coil (2) An arithmetic circuit (4) for calculating the relative position of the sensor coil (2) with respect to the excitation coil (1) and detecting the relative position of the teeth that are rigidly coupled to the sensor coil (2) The excitation coil (1) comprises an X-axis coil (1a), a Y-axis coil (1b), and a Z-axis coil (1c) wound in directions orthogonal to each other, and the sensor coil (2) The X-axis coil (2a), the Y-axis coil (2b), and the Z-axis coil (2c) are wound in directions orthogonal to each other. The X-axis coil (1a) and the Y-axis coil (1b) The excitation coil (1) composed of the Z-axis coil (1c) is excited by an AC power source (3), and the arithmetic circuit (4) is connected to the X-axis coil (2a) of the sensor coil (2) and the Y-axis. With coil (2b) An AC signal that is induced in the Z-axis coil (2c) is calculated, and the jaw movement of the tooth that fixes the sensor coil (2) on the X-axis, Y-axis, and Z-axis is calculated three-dimensionally. A method of manufacturing a sensor coil used in a measuring device,
Three sets of loop coils (8) are formed by winding conductive wire in a coil shape, and three sets of loop coils (8) are placed on the surfaces of the orthogonal surfaces of the core material (7) having three orthogonal surfaces orthogonal to each other. A method for producing a sensor coil for use in a jaw movement measuring device, comprising fixing and fixing three sets of loop coils (8) in a posture orthogonal to each other with a core material (7).

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