JP2002017731A - Three-dimensional drive motor device, and ultrasonic vibrator drive motor device and ultrasonograph using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a three-dimensional ultrasonic vibrator drive motor device and an ultrasonograph. SOLUTION: This motor device is built in an ultrasonic probe with a driving shaft and an oscillating shaft orthogonal without an intersection to constitute a three-dimensional drive mechanism device to thereby provide the three- dimensional ultrasonograph.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a three-dimensional drive motor device, and more particularly to a three-dimensional ultrasonic transducer drive motor device and a three-dimensional ultrasonic diagnostic apparatus using the same.

[0002]

2. Description of the Related Art Ultrasonic probes used for ultrasonic diagnostic apparatuses for living bodies are roughly classified into a linear scanning system and a sector scanning system. The sector scanning system mainly includes an electronic sector scanning system and a mechanical sector. There is a scanning method. As the mechanical sector scanning ultrasonic probe, the types and methods described in “Introduction to Ultrasound Inspection (Second Edition)”, page 54, published by Medical and Dental Drug Publishing Co., Ltd. are known. The mechanical sector scanning ultrasonic probe is also described in Table 3.11 on page 91 of "Revised Medical Ultrasound Equipment Handbook" (published by Corona Co., Ltd.), edited by Japan Electronics and Machinery Industries Association. Have been.

Conventionally, an ultrasonic probe (also referred to as an ultrasonic probe or an ultrasonic diagnostic probe) is disclosed in, for example,
Japanese Patent Application Laid-Open Nos. 184888, 7-163562, and 7-289550 are known.

[0004] JP-A-7-184888, JP-A-7-184888
An ultrasonic probe disclosed in Japanese Patent No. 289550 discloses an ultrasonic transmitting and receiving unit in which an ultrasonic vibrator is mounted so as to face the handle axis of the ultrasonic probe, and an acoustic mirror is provided facing the ultrasonic vibrator. And a drive motor that rotationally drives a shaft connected to a mount for the vibrator. The rotation of the drive motor causes the ultrasonic transmission / reception unit to rotate about the shaft, and the beam of the ultrasonic transducer is reflected by the acoustic mirror, so that the beam on the surface reflected with respect to the drive axis of the ultrasonic transducer It becomes a track surface. Although it depends on the tilt angle of the acoustic mirror, the beam trajectory plane is a plane perpendicular to the drive axis because it is generally a 45-degree inclined plane.

[0005] Since the drive motor is provided on the handle portion side compared to the ultrasonic vibrator, an acoustic mirror for axis conversion with respect to a drive shaft for rotating the mount of the ultrasonic vibrator by the shaft is provided. In addition to the necessity, the beam trajectory plane is an ultrasonic tomographic image that is a plane perpendicular to the handle axis direction of the ultrasonic probe.

In the ultrasonic probe disclosed in Japanese Patent Application Laid-Open No. Hei 7-163562, an ultrasonic transducer is mounted so as to extend radially with respect to the axial direction of the handle of the ultrasonic probe. The acoustic mirror described in -289550 is not required. The axis of the mount for the ultrasonic transducer is indirectly connected to the shaft of the drive motor. By the rotation of the drive motor, the ultrasonic vibrator mount rotates along the axis of the shaft, and the beam trajectory plane of the ultrasonic vibrator becomes a plane perpendicular to the drive axis.

The position of the drive motor is located on the handle side relative to the position of the ultrasonic vibrator, and the beam trajectory plane is used to rotate the mounting table of the ultrasonic vibrator with the shaft. An ultrasonic tomographic image that is a plane perpendicular to the direction is obtained.

[0008] JP-A-7-184888, JP-A-7-184888
The ultrasonic diagnostic apparatuses described in JP-A-163562 and JP-A-7-289550 can obtain only a two-dimensional ultrasonic tomographic image because there is only one drive axis.

The realization of a multi-degree-of-freedom actuator other than the ultrasonic diagnostic apparatus has been considered. For example, according to published patents, Japanese Patent Application Laid-Open Nos. Hei 7-274484 and
177724 and JP-A-8-275472.

Japanese Patent Application Laid-Open No. Hei 7-274484 has a structure in which three sets of wound magnetic poles are provided in three axial directions, has two ring-shaped frames, and the frames are supported by shafts. A rotor is formed in a frame inside the frame, and the rotor is supported by the frame. Driving force of the rotor is given from three sets of magnetic poles. With such a structure, the rotor can be rotated 360 degrees. However, when connecting the ultrasonic vibrator to the rotor, it is difficult to draw out electric wiring and the like, and a frame portion is generated on an image. Since a measurement unit is generated, such a structure cannot be used as a drive unit in an ultrasonic diagnostic apparatus.

In the case of Japanese Patent Application Laid-Open No. 7-177724,
The point that a large number of magnetic vehicles can be linked to one magnetic vehicle can be devised depending on the purpose of use. However, as a motor device used for an ultrasonic diagnostic apparatus for three-dimensional images, ultrasonic vibration The child cannot be controlled to the desired angle.

In the case of Japanese Unexamined Patent Publication No. Hei 8-275472, similarly to the case of Japanese Unexamined Patent Publication No. Hei 7-274484, when the ultrasonic vibrator is connected to the spherical rotating member, it is difficult to draw out electric wiring and the like from the rotating member. In addition, since a frame portion appears on the image, a non-measurement portion is generated on the image, and therefore, such a structure cannot be used for the drive unit of the ultrasonic diagnostic apparatus.

[0013]

However, the mechanical sector scanning type ultrasonic probe of the above-mentioned conventional example can obtain a two-dimensional ultrasonic tomographic image, but cannot obtain a three-dimensional ultrasonic tomographic image. Since the conventional ultrasonic probe has only one drive motor axis, only a two-dimensional ultrasonic diagnostic image can be obtained.

In the present invention, in order to solve the problem, the entire structural members of the ultrasonic vibrator and the drive motor for driving the ultrasonic vibrator are rotated. With this method, three-dimensionalization is possible. However, in order to make a three-dimensional mechanism compact, it is necessary to configure the ultrasonic vibrator within the range of the internal axis of the drive motor based on the positional relationship between the drive motor and the ultrasonic vibrator. However, in order to make the conventional example a three-dimensional device, since the ultrasonic vibrator is configured outside the range of the internal axis of the drive motor, a very large ultrasonic probe is required for a mechanism for rotating the whole. However, it becomes practically unusable.

In the conventional two-dimensional tomographic image, the beam trajectory plane of the ultrasonic transducer is a plane perpendicular to the handle axis of the ultrasonic probe and is not a beam trajectory plane parallel to the handle axis. However, there is a problem that a sufficient diagnosis cannot be made in intracavity scanning used in the departments and urology.

In the case where a cable is directly connected to the ultrasonic vibrator, for example, the image range of the ultrasonic vibrator is limited, so that the measuring range is narrowed. There is a problem that the image needs to be measured many times by changing the direction, and that the range in which the diagnosis cannot be made mechanically increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is possible to secure ultrasonic scanning in a three-dimensional manner, and it is a small and lightweight ultrasonic-transducer driving motor device capable of scanning. And a three-dimensional scanning ultrasonic diagnostic apparatus using the same.

[0018]

According to the present invention, in order to achieve the above object, a drive shaft of a drive motor is provided so that a beam trajectory plane of an ultrasonic transducer can be formed in a plane parallel to a handle axis. It is configured perpendicular to the handle axis.

Further, a motor device for driving an ultrasonic vibrator including a drive shaft of a drive motor and a swing shaft for swinging a beam surface in a window case and containing a sound propagation medium therein. It is what constituted.

For this purpose, a beam surface is formed within the range of the motor rotated by the drive shaft of the drive motor, and the ultrasonic transducer is mounted on the rotor case of the drive motor.

Further, the drive shaft of the drive motor and the swing axis for swinging the beam surface are orthogonal to each other to constitute an ultrasonic vibrator drive motor device, and to constitute a probe of an ultrasonic diagnostic apparatus having a small window case radius. It was done.

A beam orbit plane (orbit plane a) of the ultrasonic transducer rotated by the drive shaft of the drive motor and a swing plane (oscillation plane b) orthogonal to the orbit plane a and passing through the drive shaft are formed. The base housing which supports the bearing of the drive motor can swing on a swing plane b perpendicular to the orbit plane a of the ultrasonic vibrator rotated by the drive shaft of the drive motor through the drive shaft. For this purpose, a rail having a swing radius of curvature is provided on the base housing.

The oscillating shaft is configured within two bearing points in the base housing of the drive motor.

The base housing on which the drive motor is mounted is swung, and the chassis is formed with a guide portion for supporting the swinging portion swing shaft with rails, and the drive motor portion is stably supported. .

The present invention provides a mechanism in which the ultrasonic vibrator is configured within the range of the internal axis of the drive motor in terms of the positional relationship between the drive motor and the ultrasonic vibrator in order to make the drive motor three-dimensionally compact. A drive motor device provided with a mechanism for swinging the entire unit on a member supporting the drive motor unit,
A motor device in which an internal drive shaft of a drive motor and a swing axis are orthogonal to each other, and a distance between the drive shaft and the swing shaft is finite.

An electro-mechanical scanning type ultrasonic vibrator driving motor device for three-dimensional scanning according to the present invention includes a sound wave propagating medium, and oscillates a driving shaft of a driving motor and a beam surface in a window case. An ultrasonic transducer drive motor device having two axes, the swing axis and the oscillation axis, is configured to obtain an ultrasonic tomographic image on a beam trajectory plane parallel to the handle axis of the ultrasonic probe, and to oscillate the tomographic image. By oscillating the base housing about the axis of motion, an ultrasonic diagnostic apparatus capable of synthesizing and displaying a three-dimensional ultrasonic tomographic image becomes possible.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An invention according to claim 1 of the present invention is directed to an outer rotor type drive motor in which a rotor rotates, a drive shaft of the drive motor is supported on a base housing, and the base housing is mounted on a chassis. A three-dimensional drive motor device, characterized in that the drive shaft of the drive motor and the swinging part swing axis are orthogonal to each other without having an intersection. The drive shaft of the drive motor is fixed to the base housing, and the drive motor is swung by swinging the base housing. If the drive shaft of the drive motor is one axis and the swing axis is another axis, the motor device will be two axes, and the drive motor will swing the base housing. Will move. Furthermore, since the drive shaft and the oscillation axis are orthogonal without any intersection, and the drive axis and the oscillation axis are orthogonal at a certain distance, when the oscillation is made by the oscillation axis for that distance. There is an effect that the locus of the drive motor can be reduced and a compact motor device can be manufactured.

According to a second aspect of the present invention, an ultrasonic transducer and an ultrasonic wave propagation medium are included, and a window case made of a window material having ultrasonic transparency and the ultrasonic transducer are driven. In an ultrasonic probe including a drive motor, a drive shaft of the drive motor for driving the ultrasonic transducer mounted on an outer peripheral portion of a rotor frame of the drive motor, and a swing for swinging a base housing for supporting the drive motor. The ultrasonic vibrator drive motor is characterized in that the drive unit is built in the window case at the tip of the ultrasonic probe, and the drive shaft of the drive motor and the swing unit swing axis are orthogonal to each other without having any intersection. It is a device that has an ultrasonic vibrator within the range of the internal axis of the drive motor due to the positional relationship between the drive motor and the ultrasonic vibrator. Rukoto can.

Further, since the drive shaft and the oscillating shaft are orthogonal to each other with a certain distance, there is an effect that an ultrasonic vibrator drive motor device having a small window case and a large oscillating angle can be constructed.

According to a third aspect of the present invention, there is provided a window case including an ultrasonic vibrator and an ultrasonic wave propagating medium and made of a window material having ultrasonic transparency, and a drive motor for driving the ultrasonic vibrator. In the ultrasonic probe having
The drive shaft of the drive motor that drives the ultrasonic transducer mounted on the outer periphery of the rotor frame of the drive motor, and the swing part that swings the base housing that supports the drive motor are the tip end window case of the ultrasonic probe. The drive shaft of the drive motor is supported at both ends by bearings, and the oscillating part oscillating shaft is configured within the distance between the bearings, and the drive shaft of the drive motor and the oscillating part oscillating shaft intersect. So that the base housing can be swung orthogonally without
3. A structure in which a rail having an oscillating radius of curvature is provided on both sides of an oscillating support portion of the base housing and a guide portion for supporting a rail of the base housing on which a drive motor is mounted is formed. Ultrasonic vibrator drive motor device as described in the above, and the mechanism is such that the ultrasonic vibrator is configured within the range of the internal axis of the drive motor due to the positional relationship between the drive motor and the ultrasonic vibrator. A three-dimensional mechanism can be realized.

Further, since the drive shaft and the oscillating shaft are orthogonal to each other with a distance, an ultrasonic vibrator drive motor device having a small window case and a large oscillating angle can be constructed.

Further, the base housing on which the rocking motor is mounted has a rail for rocking, and the strength of the rocking portion of the base housing can be sufficiently secured by receiving the guide portion of the rail with the chassis. Has an action.

According to a fourth aspect of the present invention, there is provided a window case including an ultrasonic vibrator and an ultrasonic wave propagating medium and made of a window material having ultrasonic transparency, and a drive motor for driving the ultrasonic vibrator. In the ultrasonic probe having
The drive shaft of the drive motor and the swinging part swing axis are perpendicular to each other without any intersection, and the distance between the drive shaft and the swing axis is within one quarter of the inner radius of the window case. Claim 2,
3. The ultrasonic vibrator drive motor device according to item 3, wherein the ultrasonic vibrator is configured within the range of the internal axis of the drive motor due to the positional relationship between the drive motor and the ultrasonic vibrator. A three-dimensional mechanism can be made compact.

Further, the drive shaft and the swing shaft have a distance,
Since they are orthogonal, the window case can be made smaller and the swing angle can be made larger. Therefore, there is an effect that a small-sized ultrasonic diagnostic probe having a large swing angle can be configured.

According to a fifth aspect of the present invention, there is provided a window case including an ultrasonic vibrator and an ultrasonic wave propagation medium and made of a window material having ultrasonic transparency, and a drive motor for driving the ultrasonic vibrator. In the ultrasonic probe having
A drive shaft and the oscillating member pivot shaft of the drive motor is perpendicular to the no intersection, the distance between the drive shaft and the pivot shaft (a e), _{(R sa -R mo) / e} <0. 5. The ultrasonic vibrator drive motor device according to claim 2, wherein R _sa is a swing radius and R _mo is an inner radius of the window case. Since the shaft has a distance and is perpendicular to the shaft, the window case can be made smaller and the swing angle can be made larger. Therefore, there is an effect that a small-sized ultrasonic diagnostic probe having a large swing angle can be configured.

The invention according to claim 6 is the invention according to claims 2, 3,
An ultrasonic diagnostic apparatus using the ultrasonic vibrator drive motor device according to any one of claims 4 and 5, wherein the ultrasonic vibrator is positioned within the range of the internal axis of the drive motor in a positional relationship between the drive motor and the ultrasonic vibrator. Is constituted, so that a three-dimensional mechanism can be made compact.

Further, since the drive shaft and the oscillating shaft have no intersection and are orthogonal to each other with a distance, the window case can be made smaller and the oscillating angle can be made larger. Therefore, there is an effect that a small-sized ultrasonic diagnostic probe having a large swing angle can be configured.

According to a seventh aspect of the present invention, there is provided a window case including an ultrasonic vibrator and an ultrasonic wave propagating medium and made of a window material having ultrasonic transparency, and a drive motor for driving the ultrasonic vibrator. In the ultrasonic probe having
The ultrasonic vibrator is attached to the outer periphery of the rotor frame of the drive motor, and a beam trajectory plane (referred to as a trajectory plane a) of the ultrasonic vibrator rotated by the drive shaft of the drive motor is formed. An ultrasonic tomographic image of a human body can be obtained, and a base housing for supporting a drive motor moves on a swing plane (swing plane b) perpendicular to the track plane a through a drive shaft. Can be oscillated, and the drive shaft of the drive motor that drives by attaching the ultrasonic vibrator and the oscillating part oscillating axis that oscillates the base housing that supports the drive motor are orthogonal to each other without intersection. The ultrasonic transducer drive motor device is characterized in that it is a three-dimensional ultrasonic diagnostic apparatus capable of displaying three-dimensionally by synthesizing an ultrasonic tomographic image of a trajectory plane at an arbitrary swing angle. Is intended, the base housing supports the drive motor can be configured with a mechanism for oscillating compactly.

With the positional relationship between the drive motor and the ultrasonic transducer,
Since the mechanism is such that the ultrasonic vibrator is configured within the range of the internal shaft of the drive motor, a three-dimensional mechanism can be made compact.

Since the ultrasonic vibrator is attached to the outer periphery of the rotor of the drive motor, the distance between the window case and the ultrasonic vibrator can be shortened, the attenuation of the ultrasonic signal is small, and a clear tomographic image can be obtained. .

Furthermore, the beam trajectory plane is moved by oscillating the beam trajectory plane by driving the ultrasonic vibrator, so that a polyhedron is formed. By synthesizing the image of the polyhedron, three-dimensional display is possible. An ultrasonic tomographic image can be obtained.

By oscillating the drive motor, the beam trajectory can be traversed about the oscillating axis. Therefore, an ultrasonic tomographic image of a plurality of beam trajectory planes can be obtained, and these tomographic images can be synthesized and displayed in a three-dimensional image, thereby improving the convenience of diagnosis.

[0043]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment) FIG. 1 is a schematic block diagram showing an entire ultrasonic diagnostic apparatus using a mechanical sector scanning ultrasonic probe according to an embodiment of the present invention.

The ultrasonic diagnostic apparatus according to the present embodiment includes an ultrasonic probe section and a main body system section. A drive motor 3 for rotating and driving the ultrasonic transducers 1 and 2 and a base housing 4 for supporting the drive motor 3 are built in the tip of the ultrasonic probe, and the handle of the ultrasonic probe swings the base housing 4. The swing motor 5 and the handle shaft 6 are configured.

The ultrasonic vibrators 1 and 2 are attached to the outer peripheral portion of the rotating part of the drive motor 3, and radiate the beams of the ultrasonic vibrators 1 and 2 to the drive shaft in the radial direction. The ultrasonic vibrators 1, 2 generated by the rotation of the drive motor 3
Is a plane orthogonal to the drive axis.
That is, the axis perpendicular to the trajectory plane of the beam is the drive axis of the drive motor 3.

Knowing the rotational position information of the drive motor 3 is based on the ultrasonic transducers 1, 2 attached to the drive motor 3.
Will know the location information.

The rotation position information of the drive motor 3 can be known by using both reference position means as a reference for one rotation and position means of relative position information. The reference position means includes a magnetic material pin (37 in FIG. 11) and an MR element (not shown). An encoder 7 is incorporated as relative position information means. The encoder 7 includes an encoder magnet (40 in FIG. 12) on the drive motor 3 side and an MR element (41 in FIG. 12) on the base housing 4 side. The drive motor 3 is rotated and driven in several steps from 5 Hz to 17 Hz. To extract signals from the ultrasonic transducers 1 and 2 to the outside of the drive motor 3, a slip ring is formed in a rotor section of the drive motor 3. Ultrasonic transducer 1
The ultrasonic wave radiated from (or 2) advances radially to the center of the ultrasonic transducer 1 (or 2) and enters the living tissue.
After a part of the ultrasonic wave incident on the tissue is reflected in the tissue, the ultrasonic wave is received by the ultrasonic vibrator 1 (or 2), converted into an electric signal, and passed through the slip ring 8 to the outside of the drive motor 3. It is taken out and sent to the amplifier in the system body.

The conventional two-dimensional case has one axis,
In the case of this embodiment, there are two axes, a drive axis and a swing axis.

The base housing 4 supporting the drive motor 3 has a swingable mechanism, and the swing surface is a surface orthogonal to the beam trajectory surface and passing through the drive shaft. The swing angle can swing left and right by about 55 degrees.

The drive motor 3, the base housing 4, and the swing mechanism on the side of the base housing 4 are formed at the distal end of the ultrasonic probe, and are entirely formed in a window case 9 made of a window material having ultrasonic transparency. It is included in the ultrasonic propagation medium.

Torque can be transmitted using the handle shaft 6 with the ultrasonic wave propagation medium sealed. The handle shaft 6 is a torque transmission shaft for swinging the base housing 4 and is connected to the swing motor 5 on the handle portion side.
Since the swing motor 5 can know the swing angle,
An encoder 10 using an MR element having reference position information means and position information means is mounted.

A drive motor drive circuit 11 for driving the drive motor 3 and a swing motor drive circuit 12 for driving the swing motor 5 are formed in the system body.

Next, the transmission / reception circuit portion in the system body will be described. When transmitting an ultrasonic wave into a living body, the pulse generator 13 first outputs a rate pulse for determining a repetition period of the ultrasonic pulse, and sends the rate pulse to the transducer driving circuit 14. In the vibrator driving circuit 14, a driving pulse is formed to drive the ultrasonic vibrators 1 and 2 to generate ultrasonic waves. Ultrasonic waves radiated into the living body from the ultrasonic vibrator 1 (or 2) are reflected by the tissue in the living body, received by the ultrasonic vibrator 1 (or 2) used at the time of transmission, and the received signal is transmitted to the system main body. After being amplified by the amplifier 15 inside, it is sent to the B-mode signal processing circuit. In the B-mode signal processing circuit, the oscillator output is a logarithmic amplifier 16
, And are log-compressed, detected by the detection circuit 17, A / D converted by the A / D converter 18, and stored in the image memory 19. A plurality of images obtained by the swing are also stored in the image memory 19, and a three-dimensional image synthesizing process is performed by using a high-speed 3D image DSP 20. The image processing signal is output in a television format, and the three-dimensional image is output by the TV monitor 21. It is displayed as an ultrasonic tomographic image.

FIG. 2 is an external perspective view of the ultrasonic probe. In FIG. 2, reference numeral 22 denotes a handle portion, in which a relay electronic circuit board such as a swing motor is built. Reference numeral 23 denotes a distal end portion of the ultrasonic probe. A window case 9 made of a window material having ultrasonic transparency is attached to the distal end, and a drive motor and an ultrasonic vibrator are built in.
The ultrasonic probe is connected to the main body by a cable 24. The distal end has a smooth, streamlined cylindrical shape to facilitate insertion into a body cavity. The cable 24 includes an input / output line (I / O line) connecting the ultrasonic transducers 1 and 2 and the ultrasonic diagnostic apparatus main body, an electric control line for driving and controlling the drive motor 3 and the oscillating motor 5, and A cable that connects the signal line of the encoder and the signal line for shock detection to the main body of the ultrasonic diagnostic equipment, is protected by the cable coating, and only the input / output lines are shielded. Side and both ends of the ultrasonic diagnostic apparatus main body side are grounded.

First, there are various dimensional restrictions in order to configure the three-dimensional drive unit in the window case.
FIGS. 3 and 4 show models of the motor device in order to obtain the dimensional restrictions.

FIG. 3A is a model diagram (schematic motor device diagram) of a motor device in which the drive shaft of the motor device is parallel to the paper surface and the swing axis is perpendicular to the paper surface. FIG. 3B is a side view of FIG. 3A in which the drive shaft is perpendicular to the paper surface.

The drive axis of the drive motor and the swing axis are orthogonal to each other with a distance. When the distance between the drive axis and the swing axis is e, the drive center of the drive shaft is a point O ((b) in FIG. 3). )), The center of oscillation of the oscillation axis is point O _s (FIG. 3 (a)).

Since the ultrasonic vibrator is mounted in a cylindrical guide ring, the ultrasonic vibrator is described as having a shape including the guide ring. The ultrasonic vibrator is attached to the outer periphery of the rotor case of the drive motor, and the cylindrical axis of the ultrasonic vibrator is a plane orthogonal to the drive axis and is an axis in the radial direction with respect to the drive axis. .
In FIG. 3A, the cylindrical axis of the ultrasonic transducer is a point O on the drive shaft.
Since the beam passes through _p , the beam trajectory circle of the ultrasonic transducer is orthogonal to the drive axis, and the axis perpendicular to the plane of the trajectory circle is the drive axis. The radius of circular path of the point u by points u of the ultrasonic vibrator is driven to rotate around the drive center point O of the drive shaft becomes R _u of FIG. 3 (b).

[0060] around the point O _p in FIG. 3 (a), the distance among the drive motor member if g a point having the maximum distance from the point O _p and R _g.

_If the larger of R _u and R _g is R _m , R _m = max (R _u , R _g ) The inner dimension of the window case that this R _m covers with the hemispherical window case of the drive motor unit. Is the minimum radius of Actually, since the drive unit is rotating, it is necessary to provide a gap between the window case and the drive motor unit,
R _m is the minimum value of the inner dimension radius of the window case,
In practice, the window casing inside diameter is slightly larger design than R _m.

[0062] base housing of the oscillating member from FIG. 3 (a), the member position where the distance is maximum with respect to the axial center O _s of the pivot axis and the point s, the swinging radius of the point s R _sa And Assuming that the center point of the swing member at the point s is s ₀ , FIG.
Point from s is a point distant dimension c from the center s ₀ of the swinging member. In FIG. 3A, since the point s and the point s ₀ are expressed in an overlapping manner, it can be said that the swing radius R _sa is the swing radius of the point s ₀ .

FIG. 3A is a model diagram in which swinging is symmetrical, and is displayed in the state of the center of symmetry.

[0064] In the model for the analysis of FIG. 4, the center of the hemisphere of the window casing with a point O _k. In order for the base housing to swing in the window case, it is necessary to determine a swing angle at which the base housing can swing.

[0065] If the base housing in the window casing is swung, if s is point contact of the base housing to the cylindrical portion of the window casing, point to the contact point s _m
And

[0066] Since the minimum value of the inner dimension radius of the window casing is a R _m, the radius of the actual window case is greater than R _m. The actual radius of the window case is designed in consideration of a gap or the like.

The radius of the adopted window case is defined as R _mo
If a relationship of R _mo> R _m.

The window case has a hemispherical shape with a radius _Rmo and R
_Let it be a cylinder with a radius of _mo .

[0069] circular cross-section of the cylinder through the points s _m in the foregoing (FIG. 4
In the horizontal section) f, if the center O _f of the circular cross-section, ∠s ₀ O _f s _m = a δ, sinδ = c / R _mo distance _{s 0 O f = R mo ·} cosδ maximum rocking position angle ∠s ₀ O _s O if _f = theta to the sin [theta = a _{(R mo · cosδ) / R} sa initial rocking position angle = gamma, swing angle = 2 (θ-γ) Further, FIGS. 3 (a) Assuming that the total width of the base housing is 2d (the width d of the base housing), the relationship with the initial swing position angle is as follows.

[0070] Further _{sinγ = d / R sa, R} s is the swing radius by about a point O _p in FIG. 3 (a), when there is no offset is R _s is the swing radius,
By providing the offset, in order to swing even a small swing radius than R _s, distinguishes JitsuYurado radius as R _sa, and R _sa ≒ R _s -e.

In this case, the position of the drive shaft moves with the swing in relation to the shaft distance e (e is an offset amount).

From the center of the swing member, the swing angle (θ−
The drive shaft is located at a position shifted by γ). Therefore, the distance from the window case is shortened accordingly.

That is, R _mo is not the trajectory sphere diameter of the entire drive motor unit, but the trajectory sphere diameter = R _mo− e · sin (θ−γ). Actually, although slightly different, the trajectory sphere diameter is regarded as the above equation.

In an ultrasonic diagnostic apparatus, a transvaginal probe is limited in size to be inserted into a vagina. About 2 in probe outer diameter
Since it is about 5 mm or less, it is about 23 mm or less of the inner diameter of the window case in the probe.

Therefore, in the calculation, R _mo is 11 mm
The following is valid.

A calculation model is considered below. (1) Model Ac c = 3.5 mm d = 4 mm, R _mo = 9-11 mm e = 0 mm, 0.5 mm, 1 mm, 1.5 mm, 2 m
m, 2.5 mm The relationship between the trajectory sphere diameter of the entire drive motor unit and the swing angle is shown in FIG.
become that way. When the offset amount e increases, the same R _mo
The swing angle increases.

What is the actual diameter of the trajectory sphere?
Is difficult to measure, so the case radius R _moUse
Estimating the relationship between the swing angle and the ratio of the cut amount e
Is realistic. Therefore, e / R_moIs used as a scale
Therefore, considering the relationship with e, e / R_moAnd swing angle
Is as shown in FIG.

[0078] e / R _mo but also increases larger the pivot angle, on the other hand, the trajectory spherical diameter for R _mo decreases. That is, the distance between the window case and the ultrasonic transducer increases, the degree of influence of the attenuation of the ultrasonic signal in the window case increases, and the ultrasonic image is easily deteriorated. Therefore, the offset amount e cannot be too large. In consideration of the inventor's experience, the shape of the window case, and the like, the offset amount e is determined to be about 1/4 or less of the inner radius of the window case. Actually, the thickness of the window case varies depending on the location, but is about 1 mm. Therefore, the offset amount e is determined to be equal to or less than a quarter of the radius of the window case. (2) Model B c = 3.5 mm d = 4 mm, R _mo = 9-11 mm e = 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5
mm, in 3 mm, if the model B that the condition is R _s -R _mo = e, the relation between the locus spherical diameter and swing angle of the entire drive motor unit Figure 7, e / R _mo and swing angle of FIG. 8 shows the relationship.

The same result as that of the model A is obtained. That is, as the offset amount e increases, the swing angle increases for the same _Rmo . swing angle is also increased when the e / R _mo increases, on the other hand, the trajectory spherical diameter for R _mo decreases. (3) Model C c = 3.5 mm d = 4 mm, R _mo = 9-11 mm e = 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5
mm, in 3 mm, if the model C which is a condition which is R _s -R _mo = 2e, the relationship between the trajectory spherical diameter and swing angle of the entire drive motor unit Figure 9, e / R _mo and swing angle of The relationship is shown in FIG.

The results different from those of the models A and B are obtained. That is, as the offset amount e increases, the same R _mo
The swing angle becomes smaller. As e / _Rmo increases, the swing angle decreases.

Therefore, there is a condition that the offset amount e cannot be increased so much.

Of the conditions of model C, (R _s -R _mo ) / e
Is calculated as a parameter, a result like model A can be obtained under the condition of (R _s −R _mo ) / e <1.2 to 1.5. Thus, to design a three-dimensional drive motor device _{(R s -R mo) / e} <1.5 conditions.

Since R _s ≒ R _sa + e, the above equation is also expressed as follows.

(R _sa −R _mo ) / e <0.5 Therefore, in order to design a three-dimensional drive motor device, the following conditions were noted: (a) R _mo / 4> e (b) (R _sa −R _mo ) / e <0.5 FIGS. 11 and 12 are structural diagrams of the ultrasonic vibrator driving motor device according to the present embodiment on the driving motor side. 11 and 12 do not show casings such as a window case and a handle.

11 and 12, 3 is a drive motor, 4 is a base housing, 25 is a chassis body, 26
Is a side chassis, 27 is a screw, 28 is an electronic circuit board,
29 is a gear shaft, 30 is a bevel gear, 31 is a spur gear, 32 is a bevel gear, 6 is a handle shaft, 33 is a gear provided on the base housing 4, and 34 is a drive shaft of the drive motor 3. 1 and 2 are denoted by the same reference numerals.

The rotating part of the drive motor 3 rotates about the drive shaft 34 of the drive motor 3 and the rotor frame 35
Ultrasonic vibrators 1 and 2 are attached to the outer peripheral portion of.
The ultrasonic transducers 1 and 2 are also called transducers, and are components that form the core of an ultrasonic probe. An acoustic lens 36 is provided at the tip of each of the ultrasonic transducers 1 and 2.
The acoustic lens 36 effectively utilizes the phenomenon of refraction. Since ultrasonic waves have a higher sound velocity in a solid than in a liquid, the ultrasonic beam is focused on a vibrator surface by a concave acoustic lens. I have. An ultrasonic transducer to which a flat acoustic lens or a convex acoustic lens is attached in addition to the concave acoustic lens is used.

The beams of the ultrasonic transducers 1 and 2 are orthogonal to the drive shaft (drive shaft 34) of the drive motor 3 in the radial direction. The trajectory of the beam is therefore perpendicular to the drive axis. An ultrasonic tomographic image of a beam trajectory plane that is orthogonal to the drive axis of the drive motor 3 but parallel to the axis of the handle when considered as a swing center can be obtained. The ultrasonic tomographic image is a tomographic image of a plane parallel to the handle axis when located at the center of the swing range.

The drive motor 3 is provided with a magnetic material pin 37 as a reference position means for finding reference position information.
It is attached to the outer peripheral portion of a rotor frame 35 made of a magnetic material such as SUY or SUY. The pin 37 has a cylindrical portion attached to the rotor frame 35, and a cut surface 38 is provided on each of the pins 37 so that the distal end thereof is at an acute angle with respect to the driving rotation direction. The magnetic flux to this pin 37 is obtained from the main magnet of the drive motor 3. A Z-phase MR element (not shown in FIGS. 11 and 12) for detecting the pin 37 is attached to the base housing 4. The signal of the Z-phase MR element is connected to the electronic circuit board 28 through a flexible printed circuit 39 (hereinafter referred to as a flexible board), and from the electronic circuit board 28 to the handle portion of the ultrasonic probe and further to the ultrasonic apparatus main body side. Connected.

The encoder 7 is incorporated as relative position information means for knowing the rotational position information of the drive motor 3. The encoder 7 has an encoder magnet 40 on the drive motor 3 side. The material of the encoder magnet 40 is a plastic magnet, and 12 nylon is used as a base resin.

In order not to be affected by the leakage magnetic flux of the main magnet on the encoder output, the encoder magnet 4
The gap between 0 and the AB phase MR element 41 attached to the base housing 4 side is set very small. Since the gap is narrow, it is necessary to reduce the influence of the encoder magnet 40 such as swelling. Therefore, taking into account the swelling effect of being used in the ultrasonic propagation medium,
The encoder magnet 40 is made of a plastic magnet having a ferrite content of 79% or more.

When an oil containing an additive is used for the ultrasonic wave propagation medium, a plastic magnet other than nylon 12 and made of polyphenylene sulfide (commonly called PPS) is used.

The signal of the AB phase MR element 41 is connected to the electronic circuit board 28 through the flexible board 45, and is connected from the electronic circuit board 28 to the handle portion of the ultrasonic probe and further to the ultrasonic apparatus main body. .

A slip ring 8 is provided for extracting signals transmitted to and received from the ultrasonic transducers 1 and 2 to the outside of the drive motor 3. Instead of the slip ring 8, a rotary transformer may be used. The slip ring 8 has an insulating material such as an insulating sheet interposed therebetween on the drive motor 3 side,
The required number of electrodes 42 are formed, and the electrodes 42 are connected to the ultrasonic transducers 1 and 2. A brush 43 for contacting and electrically connecting the electrode 42 to each electrode is attached to the base housing 4 via a brush holder 44 made of an electrically insulating material such as a phenol resin material. The signal (I / O signal) from the brush 43 passes through the flexible substrate 46 and is connected to the ultrasonic diagnostic apparatus main body.

The motor wire 82 of the drive motor 3 is also connected to the electronic circuit board 28 through the flexible board 47, and is connected from the electronic circuit board 28 to the handle of the ultrasonic probe and further to the ultrasonic apparatus main body.

The base housing 4 which supports the drive motor 3 so as to be able to swing and rotate has a U-shape to support the bearings on both sides of the drive motor 3 and swings on the base housing 4. Rails are provided on both sides, and the rails are supported by the chassis body 25 and the side chassis 26 so as to be rotatable. Further, a gear 33 is integrally provided to transmit the swinging torque to the base housing 4. The gear 33 is partially formed with respect to the swing axis of the base housing 4 instead of the entire circumference.

The torque from the oscillating motor 5 is transmitted to the handle shaft 6, and the bevel gear 32 attached to the tip of the handle shaft 6 is rotated to be transmitted to the bevel gear 30 of the bevel gear 32. The bevel gear 30 is fixed to the gear shaft 29 by press fitting or the like, and the flat gear 31 is fastened to the gear shaft 29 by press fitting or the like. The gear shaft 29 is rotatably supported by a ball bearing attached to the chassis body 25 and a ball bearing attached to the side chassis 26. Therefore, the torque transmitted to the bevel gear 30 is transmitted to the mating gear 33 of the spur gear 31 via the spur gear 31, so that the base housing 4 can swing by the swing motor 5.

The spur gear 31, the bevel gear 30, and the bevel gear 32 are gear-processed with a copper-based material, and are subjected to electroless nickel plating from the viewpoint of gear wear due to swinging motion. Further, in order to reduce the sliding resistance, a surface treatment consisting of electroless nickel plating containing Teflon (registered trademark) with an electrolyte solution in which Teflon is composited is applied to the flat gear 31, bevel gear 30, bevel gear 32, etc., which are swing gears. Sometimes it is applied. The flat gear 31 and the bevel gear 3 which are rocking gears are formed by electroless nickel plating with boron.
0, it may be applied to the bevel gear 32.

If abrasion powder of the gear enters between the electrode of the slip ring and the brush, the signal enters the signal of the ultrasonic vibrators 1 and 2 as noise. Pay attention. In the case of a copper-based material, processing burrs are removed by pickling or the like.

The swing of the base housing 4 supports the rail provided on the base housing 4 so as to be rotatable by rail guide grooves of the chassis main body 25 and the side chassis 26.
Acts as an integrated chassis.

The chassis body and the side chassis may be integrated.

The handle shaft 6 is attached to the chassis body 25.
Is fixed. Since the handle shaft 6 is longer than the drive shaft 34 and the gear shaft 29, the handle shaft 6 is rotatably supported by two bearing portions. The two bearings are used without applying preload so that alignment is possible. One bearing is formed near the center of the chassis main body 25, and the other bearing is formed on the handle portion side.

The ultrasonic vibrators 1 and 2 are rotated by the drive motor 3, and the beam trajectory plane (drive beam trajectory plane) of the ultrasonic vibrators 1 and 2 is orthogonal to the drive axis of the drive motor 3. It is a side to do. As can be seen from FIG. 11, the ultrasonic tomographic image acquisition area in the ultrasonic transducer array direction obtained by transmitting and receiving ultrasonic waves from the ultrasonic transducers 1 and 2 is not a 360-degree whole circumference but a chassis body 25 and a side chassis. 26
To a certain range (the angle α). The range represents an ultrasonic scannable area where the ultrasonic transducers 1 and 2 can scan. In an actual ultrasonic diagnostic apparatus, the angle is set slightly smaller than the geometric angle α in consideration of the problem of reflection and the like. In the case of this embodiment, it is 230 degrees.

The ultrasonic vibrators 1 and 2 are provided between the two bearings of the drive motor 3 and are mounted on the outer periphery of the rotor frame 35 of the drive motor 3 having the dual support.
The ultrasonic tomographic image is orthogonal to the drive motor axis and never to the handle axis.

Assuming that the swing range is the entire circumference, the range in which the tomographic image can be scanned in the beam trajectory planes of the ultrasonic transducers 1 and 2 due to the swing (referred to as the swing beam trajectory plane) is as shown in FIG.
As can be seen from FIG. 1, a wide angle is possible because a space is open for a component such as a flexible substrate in the central portion where the chassis main body 25 and the side chassis 26 are combined. The range of gears is limited. The swing angle is set to the same angle on both sides with the handle axis as the center, and the swing angle β is an angle distributed at the handle axis center. In this embodiment, the angle is 100 degrees. The oscillating beam trajectory plane is a plane orthogonal to the drive beam trajectory plane and passing through the drive axis.
The oscillating beam trajectory plane is parallel to the handle axis.

When the drive motor 3 is rotated to obtain an ultrasonic tomographic image on the drive beam trajectory surface and is oscillated, the drive beam surface can be scanned about the oscillating axis while being orthogonal to the oscillating beam surface. An ultrasonic tomographic image of a three-dimensional area is obtained.

As described above, in this embodiment, a three-dimensional scanning ultrasonic probe can be realized. For example, it is possible to obtain an unprecedented wide measurement range in which an ultrasonic tomographic image in a range in which the 230-degree region is swung by 100 degrees can be obtained.
Further, when the ultrasonic probe for three-dimensional scanning is used by inserting it into the body cavity, the ultrasonic transducer can be arranged at the distal end of the insertion part, so that the insertion part can be made more compact. Having.

In this embodiment, two ultrasonic transducers are used. The codes are 1 and 2.

Therefore, two types of ultrasonic transducers can be mounted, and one ultrasonic probe can handle two different distance resolutions.

In general, the distance resolution is improved when the frequency is high. However, when the frequency is high, the attenuation of the ultrasonic wave increases, so that diagnosis cannot be performed in a deep part, and a single ultrasonic probe has a different ultrasonic frequency. Since ultrasonic transducers can be switched and used, better ultrasonic diagnosis is possible.

The ultrasonic vibrators 1 and 2 mounted on the rotor frame 35 are mounted at a position 180 degrees away from the drive rotation axis. In order to prevent the ultrasonic wave radiated from one ultrasonic vibrator from being received by the other ultrasonic vibrator and to enter into the ultrasonic wave reception as noise, 180
Two ultrasonic transducers are attached in pairs of degrees. In the case of a slip ring, there is almost no effect, but in the case of a rotary transformer or the like, crosstalk causes image noise, so that sufficient consideration is required.

FIG. 13 is a diagram for explaining a slip ring. In FIG. 13, the electrode 42 (same as the reference numeral in FIG. 12) is composed of three electrodes 42a, 42b, and 42c, each of which is a polyester insulating sheet 4.
Insulated by 8a, 48b, 48c. The electrode 42 is formed by cutting or pressing brass by metal working into a ring having a protrusion 49 on the inside, and the protrusion 49 has a small hole 83 for soldering a lead wire. Further, the projection 49 has a step 50 which is thinner than the thickness of the outer peripheral ring. The step 50 is formed on one surface of the projection 49 and extends to a radius smaller than the inner diameter of the ring of the electrode. When the lead wire is soldered, the solder stays on the stepped portion and does not flow to the ring side of the electrode, the electrode does not tilt due to the solder when assembling the slip ring, and the sliding position with the brush 43 fluctuates with rotation. There are effective effects such as no.

The ultrasonic transducer has two lead wires,
One is an electric ground (GND) and the other is a signal line. In the ultrasonic probe of this embodiment, the driving motor 3
Since there are two ultrasonic vibrators attached thereto, there are four leads, but the electric ground can be treated as three leads because they are handled in common. Since the ultrasonic vibrators are 180 degrees apart, the electric ground lines cannot be easily connected to each other, so they are connected via the electrode 42. Four lead wires protrude from the electrode 42.
Two of them emerge from the same electrode in directions about 180 degrees apart. Therefore, three electrodes are required for two ultrasonic transducers. Of the three electrodes, the electrode 42c of the electric ground is formed on the window case side, and the frequency of the ultrasonic transducer becomes higher toward the inside.

The ultrasonic transducer emits an ultrasonic wave in response to an electric signal sent from the ultrasonic diagnostic apparatus main body via the I / O line, receives the ultrasonic wave reflected from the subject, and detects a change in the charge amount. Occurs. The electrical change of the ultrasonic transducer is transmitted to the ultrasonic diagnostic apparatus main body via the I / O line. Since the electric signal flowing through the I / O line is a frequency signal in the range of 3 kHz to 8 kHz, it becomes a main noise source of unnecessary radiation. In this embodiment, a part of the I / O line is constituted by the flexible substrate 46. Since the I / O line is shielded by using a shield line or the like, it has an effect of preventing unnecessary radiation, but the electrode portion of the slip ring cannot be shielded. The unnecessary radiation is reduced by examining the position of the electrode at the frequency to be used. That is, of the three electrodes, the electrode of the electric ground is formed on the window case side, and the frequency of the ultrasonic transducer is increased toward the inside.

FIGS. 14 and 15 are views for explaining the relationship between the brush and the flexible substrate in the brush holder.
14 and 15, reference numeral 44 denotes a brush holder;
Is a brush, and 46 is a flexible substrate.

The brush holder 44 is made of an electrically insulating material such as a phenol resin material, and has a threaded hole 84 so that it can be attached to the base housing 4. A concave portion 51 having a step corresponding to the thickness of the flexible substrate 46 is formed at a position where the flexible substrate 46 is bonded and fixed to the brush holder 44. The presence of the concave portion 51 allows the brush 43 to be in close contact with and fixed to the surface 52 of the brush holder. The brush holder 44 has a hole 53 through which the brush 43 is attached.
After attaching the brush 43 to the hole 53, the hole 53 is fixed with an adhesive. The I / O line flexible substrate 46 has brushes at positions facing the three electrodes, and the lands 85a, 8 are provided for soldering the brush 43 to the flexible substrate 46.
5b and 85c are not arranged at right angles to the brush. In the figure, the lands 85a, 85b, and 85c change places in the longitudinal direction of the brush, and the lands 85a located inside the motor are arranged on the left side in FIG. The land 85c near the window case is arranged on the right side in FIG. This is because, for example, the pitch between the brushes is 0.688 mm and the brush wire diameter is 0.15 mm, and the arrangement at right angles to the brush is about 0.3 mm in land diameter, which makes soldering workability difficult. is there.

The flexible substrate 46 is a double-sided through-hole substrate. The electric ground line is brought to one side from a little distance by a brush holder, and the signal line is configured on the opposite side. By forming this electric ground on one surface, the effect of the electric shield is obtained.

The flexible substrate 47 for the motor line 82 and the flexible substrates 39 and 4 for the signal lines of the AB phase detection MR element 41
5 is connected to the electronic circuit board 28, but the flexible board 46 of the I / O line goes out of the drive motor 3 in a state of being stacked with the three flexible boards 47, 39 and 45. Therefore, the electric ground plane of the flexible substrate 46 is connected to the position information signal line so that unnecessary radiation generated from the flexible substrate 46 of the I / O line does not jump into the signal line (position information signal line) of the MR element 41. It is located towards.

The position information signal line of the drive motor 3 driven to rotate in the ultrasonic wave propagation medium (acoustic medium liquid) is a signal line for knowing the scanning position of the ultrasonic transducer from the encoder. When noise enters from the flexible substrate, the position information becomes unstable and the control of the drive motor 3 becomes unstable. However, since the flexible substrate 46 of the I / O is electrically shielded, the influence of the noise is reduced. I will not receive it.

The swing motor 5 uses a brushless motor so as not to be affected by brush noise or the like generated by a brush motor.

The transmission and reception of electric signals between the ultrasonic transducer and the apparatus main body are performed correctly, and an accurate ultrasonic image with less noise can be obtained.

The base housing 4 is made of a metal powder injection molding method (Metal Injection Molding = M).
IM hereinafter referred to as MIM).

The MIM is described in R. E. FIG. Wiech developed the Whitec process, a technology that was put into practical use in 1972, and was able to accurately produce three-dimensional parts with complex shapes. This is the fifth generation after machining, die casting, precision casting, and powder metallurgy. This method is attracting attention as a metalworking method, which is comparable to metalworking accuracy and has a dimensional tolerance of ± 0.05 mm at a general tolerance of 10 mm or less and ± 0.05 mm at a special tolerance.
The accuracy is about 0.03 mm, which cannot be obtained by other metal die casting or the like. The base housing 4 (reference numeral 4 in FIGS. 3 and 4) of the present embodiment partially forms a gear portion, has a three-dimensionally complex shape, and is required to have stable dimensional accuracy. I made it.

In order to manufacture the MIM, the shape of the mold and the molding conditions of the product were examined at the following points. See FIG. 16 to FIG. 19 for the manufactured parts. (1) Unnecessary parts were removed so that the thickness of the parts was as uniform as possible. (2) In order to reduce the taper to zero by using a spur gear, the resistance at the time of releasing the mold was reduced, and a tapered portion of approximately one degree was formed at a dimension where accuracy was allowed. (3) The base housing having a large number of arc shapes constitutes a portion having a shape that can be deleted by secondary processing in order to stabilize a molded product at the time of sintering. (4) In the process of mold release, degreasing, sintering, etc., the gear part is reduced in the product size with respect to the mold release dimension, so the gear part is not easily affected by the reduction. Shape. (5) The rail portion of the base housing is not deformed. (6) A portion having a shape that can be deleted by the secondary processing is added to the product shape, and the added portion is provided on the gear side. (7) Assuming secondary processing, the rail portion has a shape that can be deleted by secondary processing. (8) To reduce the number of secondary processing parts as much as possible.

From the above viewpoint, the product shape and the mold product shape were designed.

The MIM is similar to a plastic molding method for producing a part or the like by injecting a heated and melted thermoplastic substance into a mold at a high pressure and a high speed and cooling it. By pulverizing into fine powder (metal powder), kneading the metal powder and an organic substance such as a resin or wax serving as a binder to impart fluidity,
The obtained material is heated and melted, granulated, and injection molded in the same manner as plastic. Thereafter, the obtained molded body is degreased by a thermal decomposition method or the like, and then sintered to produce a metal part.

The material of the base housing 4 is a non-magnetic material, which is required to be strong, and is a material having a stable physical property with respect to the ultrasonic wave propagation medium, such as SUS303, SUS304, SUS304L, SUS304 of austenitic stainless steel.
316, SUS316L and other non-ferrous materials WC-Co, W
-Cu-Ni, W-Fe-Ni, Ti and the like can be selected. SUS316L stainless steel powder, which is a fine powder having a powder particle diameter of 5 to 10 μm, was used.

On the other hand, examples of the binder include olefin resins such as polyethylene and polypropylene, styrene resins such as acrylic resin and polystyrene, and various thermoplastics such as polyamide, polyimide, polyester, polyether, liquid crystal polymer, and polyphenylene sulfide. One or more of resins, various waxes, paraffins and the like can be used in combination.

As a result of an experiment in which an acrylic resin and polystyrene were blended as an example of the binder of the base housing 4 and the addition amount was generally used at about 60 vol%, a decrease in the dimensions was observed. When the addition amount is about 10 vol%, the molding fluidity becomes poor, the injection molded product becomes defective, and the parts are not degreased due to the influence of micro cracks and the like at the time of molding release and when the molded body is placed in a vacuum furnace. Missing occurs.

The addition amount is set from the viewpoint of molding stability of the molded body, and is set to about 15 to 50 vol% in order to improve the dimensional accuracy of the gear portion due to shrinkage when the molded body is sintered. I have.

Further, the gear tooth surface and M
Since the molded part has a straight part without a taper in the mounting part of the R element and the mounting part of the brush holder, a small amount of additives such as a plasticizer and a lubricant are added to the kneaded product of the metal powder and the binder. .

FIG. 1 is a perspective view of a mold product (MIM blank product) of the base housing 4 which is considered based on the points for designing the product shape and the mold product shape described above.
6, shown in FIG. FIG. 16 is a perspective view from the gear 33 side,
FIG. 17 is a perspective view from the opposite side of the gear 33. Figure 1
6, in FIG. 17, the MIM blank 55 of the base housing 4 has columns 58, 5 on which cylindrical portions 56, 57 to which bearings for supporting the drive motor 3 are attached are formed.
The cylindrical portion 56 is a hole for bearing support on the slip ring 8 side, and the column portion 58 is provided with two mounting holes 60 for fixing the brush holder 44 with screws.
In order to stably slide the brush 43 and the electrode of the slip ring 8, a mold is manufactured without a taper so that the brush holder 44 can be mounted on the brush holder mounting portion surface 61 so as not to be inclined. In order to take out the I / O flexible substrate 46 (FIG. 15) outside the base housing 4,
An I / O flexible board hole 63 having a rectangular shape is formed near the boundary between the support portion 58 and the swing support portion 62. Since the strength of the connecting portion of the support portion 58 tends to be weakened due to the hole 63, the connection portion of the swing support portion 62 and the support portion 58 should have the thickness of the base housing 4 as thin as possible without contacting the brush 43. The inclined portion 64 is provided so as to be thick. The inclined portions 64 formed on both sides of the hole 63 improve the impact resistance of the column portion 58.

The bearing on the encoder 7 side is attached to the cylindrical portion 57 for attaching the bearing of the column portion 59. The cylindrical portion 57 is a hole in the cylindrical portion for bearing support on the encoder 7 side, and the support portion 59 has a mounting hole 65 for mounting the MR element 41 for fixing the AB phase MR element 41 with a screw. Two are provided. AB phase detection MR element 41
Also, a mold was manufactured without a taper so that the gap between the encoder magnet (reference numeral 40 in FIG. 12) and the AB phase MR element (reference numeral 41 in FIG. 12) could be adjusted in parallel. ing. In order to take out the flexible substrate 45 connected to the AB-phase MR element, hooks 66 are integrally formed on both sides of the column 59 with MIM.

Rail portions are formed on both sides of the swing support portion 62 of the base housing 4 for swinging. A hole 67 for fixing the Z-phase MR element and a hole 68 for taking out the flexible substrate 45 of the Z-phase MR element from the base housing 4 are formed in the swing support portion 62.

The rail of the base housing 4 is manufactured by adding a processing allowance to the dimensional accuracy of the MIM blank 55 by secondary processing (also referred to as machining).

[0135] The MIM blank 55 has a reduced thickness in order to improve the dimensional accuracy by reducing the shrinkage when the molded body is fired and to improve the dimensional accuracy by reducing the porosity of the sintered body. The inner meat of the swing support portion 62 and the like is adjusted so as to be as uniform as possible.

The tooth surface of the gear 33 is provided with a knock pin in the vicinity of the gear 33 at the time of releasing the mold in order to reduce the draft taper to zero.

The connection with the portion 72 which can be removed by the secondary processing is made up of the portion 69 connected to the tip of the column 58, the portion 70 connected to the tip of the column 59, and the portion connected to the rail on the gear 33 side. 71 at three locations.
Spaces 73 and 74 are provided in a portion 72 of a shape that can be deleted in the secondary processing because of the releasability of the gear 33 portion and the ease of setting the processing tool in the secondary processing.

Since the surface of the portion 72 of the shape that can be deleted by the secondary processing is made large, the molded body can be stably placed, and the working efficiency of the parts in the degreasing process and the sintering process is improved. In addition, the finished product is stable.

FIGS. 18 and 19 show the secondary processing MI of the product shape.
It is a perspective view of M goods. FIG. 18 is a perspective view from the gear portion, and FIG. 19 is a perspective view from the opposite side of the gear. Figure 1
The secondary processing MIM product shown in FIGS. 8 and 19 shows the base housing 4 used for the ultrasonic diagnostic apparatus by performing secondary processing on the MIM blank product 55 shown in FIGS. 18 and 19, the same reference numerals are used for the parts. FIG. 20 shows a bearing collar.

In FIGS. 18 and 19, reference numeral 33 denotes a gear,
6, 57 are cylindrical portions for supporting bearings, 58, 59 are support portions, 60 is a mounting hole for fixing the brush holder, 62 is a swing support portion, 63 is a hole for a flexible substrate of I / O, 64 Is an inclined portion, 65 is a mounting hole for mounting an AB-phase MR element, 66 is a hook, 67 is a hole for fixing a Z-phase MR element, and 68 is Z
A hole for taking out the flexible substrate 39 of the phase from the base housing 4.

Next, the secondary processing will be described.

In order to mount the bearing collar 75 on the support portions 58, 59, the holes 56, into which the bearing collar 75 is inserted, are provided.
57 is provided with a slight processing allowance. The inner diameters of the holes 56 and 57 are finished so that they can be rotatably engaged with a small gap.

In the MIM blank 55 of the base housing 4, the inside of the support portions 58 and 59 has a taper of about 1 degree. To assemble the drive motor 3, if the inside of the support portions 58 and 59 is tapered, trouble will occur in motor assembly. Therefore, in order to mount the drive motor 3 assembled with the distance between the bearing collars 75 according to the dimensions to the base housing 4, the inside of the support columns 58 and 59 should not be inclined in accordance with the distance between the bearing collars 75. To 2
The following processing is given. The secondary processing surfaces of the support portions 58 and 59 are 76 and 77, respectively. The surface 77 is shown in FIGS.
In the figure, it cannot be represented as a surface, but is represented by a ridgeline of a step due to processing. Since the axial preload stably acts on the bearing, the drive motor 3 can be mounted in a state of good reliability.

The large part of the secondary machining deletion part is the part 69-
72, and the part is deleted by the secondary processing. The swing races 86 and 87 of the base housing 4 are finished using the same chuck as that for the removal operation. The swing race 86 indicates a race on the gear 33 side in the base housing 4, and the swing race 87 indicates a race on the opposite side of the gear 33 in the base housing 4.

By examining the mold shape, etc., the base housing 4 has a three-dimensionally irregular shape. However, it is possible to achieve the required dimensional accuracy with little or no secondary processing and the accuracy of the MIM mold molded product. To be able to get out.

The bearing collar 75 shown in FIG. 20 comprises a flange 78, cylindrical portions 79 and 80, and a notch 81.
The flange 78 is disposed so as to face the inner surface of the support portion of the base housing 4 to prevent the drive motor 3 from falling off or moving from the base housing 4. Cylindrical portions 79 and 80 are provided on both sides of the flange 78, and the cylindrical portion 79 is assembled in contact with the inner ring of the ball bearing of the drive motor 3, and thus has a size corresponding to the outer diameter of the inner ring. The cylindrical portion 80 engages with the holes 56 and 57 provided in the support portion of the base housing 4. The cylindrical portion 80 is provided with notches 81 at two locations on the outer periphery of the cylindrical portion 80 for inserting the drive motor 3.

FIG. 21 is an explanatory view for engaging the bearing collar 75 with the holes 56 and 57 provided in the support portion of the base housing 4. There are two bearing collars 75 on both sides of the drive motor 3. The bearing collar 75 has a bearing collar 75a on the encoder 7 side and a slip ring 8a.
The bearing collar on the side is identified as 75b. When referring to both of the bearing collars, the description is made with reference numeral 75. FIG.
Reference numeral 1 denotes a bearing collar 75a for explanation of the cylindrical portion 57 of the column portion 59 on the encoder 7 side. The bearing collar 75b is not shown. FIG. 21A shows a bearing collar 75a.
FIG. 9 is an explanatory diagram of an insertion method for engaging the cylinder with a cylindrical portion 57. In the circular cylindrical portion 57 provided on the support portion 59 of the base housing 4, an opening parallel to the side opposite to the swing support portion 62 is provided to the outside of the support portion. The opening 8
Reference numeral 8 denotes a configuration connected to the cylindrical portion 57 and the outside. The notch 81 of the bearing collar 75a is connected to the opening 88 of the support 59.
Is inserted from above the support portion 59 so as to be parallel to. In practice, the drive motor 3 with the bearing collars 75 mounted on both sides is inserted into the base housing 4, so it is not the case that only the bearing collar 75 is inserted alone, but the description will be made with the bearing collar 75 for explanation. If the bearing collar 75 can be inserted, the drive motor 3 can be inserted, and the drive motor 3 can be incorporated in the base housing 4.

Further, the center of the bearing collar 75a is aligned with the center of the cylindrical portion 57 of the support portion 59 by inserting the bearing collar 75a. The bearing collar 75a is rotated by 90 degrees with its axes aligned, and the surface of the notch 81 of the bearing collar 75a is made orthogonal to the surface of the opening 88 of the column 59. In this state, the bearing collar 75a does not fall off. That is, the mounting of the drive motor 3 on the base housing 4 is completed.

FIG. 22 shows a view of the chassis main body. The chassis main body 25 is provided with a rail groove 89 that guides and swings a swing rail of the base housing 4. The guide rail groove is designed to have a swingable range as wide as possible. A hole 90 is formed in the side surface of the chassis body 25 for mounting a bearing of the gear shaft 29 that transmits the swing torque to the chassis body 25. The central portion of the chassis body 25 also serves as a connecting portion with the side chassis 26, and the mating surface 91 with the side chassis 26 affects the swinging performance, so that it does not have an inclination with respect to the swing axis. The processing of the rail groove 89 and the processing of the mating surface 91 are performed by the same chuck. The mating surface 91 has a screw hole 92 for attaching the side chassis 26, and further has a parallel guide groove 93 for positioning with the side chassis 26.

The chassis body 25 has a guide hole 94 for mounting a bevel gear for transmitting the swinging torque. This guide hole 94 is penetrated. Chassis body 2
5 is formed with a screw hole 95 for mounting the electronic circuit board 28.

The chassis body 25 is cast by brass die-casting, and the cast product is metal-processed to finish it to the required dimensional accuracy. In addition, since there are places where sliding performance is required, the surface is subjected to electroless nickel plating containing Teflon. In order to reduce the sliding resistance, the chassis main body 25 may be subjected to electroless nickel plating with Teflon using an electrolyte solution in which Teflon is composited. In addition, electroless nickel plating with boron
5 may be applied.

The rail groove 89 of the chassis body 25 is used by being immersed in an ultrasonic wave propagation medium,
Since 8 is in the air, the chassis body 25 also has a purpose as a sealing member, and the chassis body 25 needs to be airtight. Therefore, a brass die-casting method used for a clock or the like is used for the chassis body 25. did.

If the purpose is to reduce the weight, a chassis body made of aluminum die-cast or magnesium alloy is used.

FIG. 23 shows a view of the side chassis. The side chassis 26 is provided with a rail groove 96 that guides and swings a swing rail of the base housing 4.
The guide rail groove 96 is designed so that the swingable range is as wide as possible, and is larger than the range of the rail of the base housing 4. By making the rail angle range of the rail groove 96 larger than the rail angle range of the base housing 4, the rocking resistance is stabilized, and the rocking stability is increased.

Since the mating surface 97 with the chassis body 25 affects the rocking performance, the rail groove 96 and the mating surface 97 should be machined in the same chuck so as not to be inclined with respect to the swing axis. Done. The mating surface 97 has a screw hole 98 for attaching the side chassis 26 to the chassis main body 25, and further engages with a parallel guide groove for positioning the chassis main body 25 for positioning with the chassis main body 25. A convex portion 99 having a parallel portion is formed.

The side chassis 26 is also cast by brass die-casting similarly to the chassis body 25, and the cast product is metal-worked and finished to the required dimensional accuracy. In addition, since there are places where sliding performance is required, the surface is subjected to electroless nickel plating containing Teflon. In order to reduce the sliding resistance, the side chassis 26 may be subjected to electroless nickel plating with Teflon using an electrolyte solution in which Teflon is composited. Further, the side chassis 26 may be subjected to an electroless nickel plating process containing boron.

The rail groove 96 of the side chassis 26 is used by being immersed in an ultrasonic wave propagation medium, and the ultrasonic probe is configured so that the convex portion 99 side is in the air. Since the side chassis 26 also needs to be air-tight because it has a purpose as a sealing member, a brass die-cast method is used.

When the purpose is to reduce the weight, a side chassis using an aluminum die-cast or magnesium alloy may be used.

As described above, the ultrasonic probe for three-dimensional scanning in this embodiment is lightweight and small, and the main mechanism of the swinging unit and the driving unit is built in the tip of the probe. According to the ultrasonic transducer, an ultrasonic tomographic image in a wide angle range can be obtained. Further, when the ultrasonic probe for three-dimensional scanning is used by inserting it into the body cavity, the ultrasonic transducer can be arranged at the distal end of the insertion part, so that the insertion part can be made more compact. Having.

The three-dimensional scanning by the three-dimensional scanning ultrasonic probe of this embodiment is possible, and the rotation angle signal from the encoder on the driving motor side is superimposed with the rotation of the driving motor to which the ultrasonic transducer is fixed. Transmitted to the ultrasound diagnostic device,
A two-dimensional ultrasonic tomographic image is obtained. A rotation angle signal is transmitted to an ultrasonic diagnostic apparatus from an encoder mounted on the rocking motor side in accordance with the rotation of the rocking motor in order to rock the base housing supporting the drive motor, and ultrasonic vibration is performed at predetermined angles. By performing electronic scanning of the child, a plurality of ultrasonic tomographic images can be obtained. A three-dimensional ultrasonic tomographic image can be obtained from the obtained plural ultrasonic tomographic images.

The same effect can be obtained if the drive motor of the three-dimensional drive motor device of this embodiment is not a rotary drive motor that makes one rotation but a swing motor that can swing at a fixed angle.

Further, by using a swing motor as the driving motor, a small-sized eyeball-type surveillance camera system becomes possible, and the present invention can be applied to a small-sized security sensor device.

[0163]

As is clear from the description of the above embodiment,
According to the first aspect of the present invention, the drive shaft of the drive motor is fixed to the base housing, and the drive motor is swung by swinging the base housing. If the drive shaft of the drive motor is one, the swing shaft is another, and the motor device is two. Since the base housing of the drive motor swings, the drive motor moves three-dimensionally when viewed from the chassis. Further, since the drive shaft and the swing axis are orthogonal without any intersection, the drive shaft and the swing axis are orthogonal at a certain distance, and the swing By doing so, the trajectory of the drive motor can be reduced, and an advantageous effect that a compact motor device can be manufactured can be obtained.

According to the second aspect of the present invention, since the ultrasonic transducer is configured within the range of the internal axis of the drive motor in accordance with the positional relationship between the drive motor and the ultrasonic transducer, it is possible to reduce the size of the ultrasonic transducer. It can be dimensionalized.

Further, since the drive shaft and the oscillating shaft are orthogonal to each other with a certain distance, an advantageous effect that an ultrasonic vibrator drive motor device having a small window case and a large oscillating angle can be obtained.

According to the third aspect of the present invention, since the drive shaft and the oscillating shaft are orthogonal to each other with a distance, the ultrasonic vibrator driving motor device having a small window case and a large oscillating angle is constituted. it can.

Further, the base housing on which the rocking motor is mounted has a rail for rocking, and the guide portion of the rail is received by the chassis, so that the strength of the rocking portion of the base housing is sufficiently ensured. can do.

According to the fourth and fifth aspects of the present invention,
Since the drive shaft and the swing shaft have a distance and are orthogonal to each other, the window case is small and the swing angle can be increased. Accordingly, an effect is obtained that the motor device for an ultrasonic diagnostic probe, which is small and has a large swing angle, can be made compact and three-dimensional.

According to the sixth aspect of the present invention, since the drive shaft and the swing shaft have a distance and are orthogonal to each other, the window case can be small and the swing angle can be increased. Therefore, an effect is obtained that the ultrasonic diagnostic probe having a small size and a large swing angle can be compactly formed into a three-dimensional mechanism.

According to the seventh aspect of the present invention, a small-sized ultrasonic vibrator driving motor device having a large oscillating angle is used because the driving shaft and the oscillating axis are orthogonal without any intersection. An ultrasonic diagnostic apparatus can be configured.

Further, by tracing the beam trajectory plane about the swing axis, ultrasonic tomographic images of a plurality of beam trajectory planes can be obtained, and these tomographic images can be synthesized and displayed in a three-dimensional image. This has the effect of improving the convenience of diagnosis.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram showing an entire ultrasonic diagnostic apparatus using a mechanical sector scanning ultrasonic probe according to an embodiment of the present invention.

FIG. 2 is an external perspective view of an ultrasonic probe according to an embodiment of the present invention.

3A is a model diagram of a motor device according to an embodiment of the present invention. FIG.

FIG. 4 is an explanatory diagram of a model of a motor device according to an embodiment of the present invention.

[5] relationship diagram between the trajectory spherical diameter _{(R mo -esin (θ-γ} )) and the rocking angle

FIG. 6 is a diagram showing a relationship between (R _mo / e) and a swing angle.

FIG. 7 is a diagram showing the relationship between the trajectory sphere diameter ( _Rmo− e · sin (θ−γ)) and the swing angle.

FIG. 8 is a diagram showing the relationship between (R _mo / e) and the swing angle.

FIG. 9 is a diagram showing the relationship between the trajectory sphere diameter ( _Rmo− e · sin (θ−γ)) and the swing angle.

FIG. 10 is a diagram showing the relationship between (R _mo / e) and the swing angle.

FIG. 11 is a structural diagram of a drive motor side of an ultrasonic transducer drive motor device according to an embodiment of the present invention.

FIG. 12 is a structural diagram of a driving motor side of an ultrasonic transducer driving motor device according to an embodiment of the present invention.

FIG. 13 is a diagram illustrating a slip ring according to an embodiment of the present invention.

FIG. 14 is a view for explaining a relationship between a brush and a flexible substrate in the brush holder according to the embodiment of the present invention.

FIG. 15 is a view for explaining a relationship between a brush and a flexible substrate in the brush holder according to the embodiment of the present invention.

FIG. 16 illustrates a base housing M according to an embodiment of the present invention.
Perspective view from the gear side of an IM blank product

FIG. 17 is a perspective view from the opposite side of the gear of the MIM blank product in the base housing according to the embodiment of the present invention.

FIG. 18 is a perspective view from the gear side of a secondary processed MIM product in the base housing according to the embodiment of the present invention.

FIG. 19 is a perspective view of the secondary processed MIM product in the base housing according to the embodiment of the present invention, as viewed from the side opposite to the gear;

FIG. 20 is a perspective view of a bearing collar according to an embodiment of the present invention.

FIG. 21 is an explanatory diagram for engaging a bearing collar according to an embodiment of the present invention with a cylindrical portion provided on a support portion of a base housing.

FIG. 22 is a diagram of a chassis body according to an embodiment of the present invention.

FIG. 23 is a diagram of a side chassis according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 2 Ultrasonic vibrator 3 Drive motor 4 Base housing 5 Swing motor 6 Handle shaft 7 Encoder 8 Slip ring 9 Window case 10 Encoder 11 Drive motor drive circuit 12 Swing motor drive circuit 13 Pulse generator 14 Transducer drive circuit REFERENCE SIGNS LIST 15 amplifier 16 logarithmic amplifier 17 detection circuit 18 A / D converter 19 image memory 20 image DSP 21 TV monitor 22 handle part 23 tip part 24 cable 25 chassis body 26 side chassis 27 screw 28 electronic circuit board 29 gear shaft 30, 32 bevel gear 31 flat gear 33 gear provided on base housing 34 drive shaft 35 rotor frame 36 acoustic lens 37 pin 38 cut surface 39, 45, 46, 47 flexible substrate 40 encoder magnet 4 DESCRIPTION OF SYMBOLS 1 MR element 42, 42a, 42b, 42c Electrode 43 Brush 44 Brush holder 48, 48a, 48b, 48c Insulating sheet 49 Projection part 50 Step part 51, 54 Depression 52 Brush holder surface 53, 83, 90 hole 55 MIM blank product 56, 57, 79, 80 Cylindrical part 58, 59 Support part 60 Mounting hole for fixing brush holder 61 Brush holder mounting part surface 62 Swing support 63 I / O flexible substrate hole 64 Inclined part 65 For mounting MR element Mounting hole 66 Hook 67 Hole for fixing Z-phase MR element 68 Hole taken out from base housing 69 Portion connected to tip end 70 Portion connected to tip end of support portion 71 Portion connected to gear side rail 72 2 73, 74 Space 75 Bearing collar 75a Encoder-side bearing Lever 75b Slip ring side bearing collar 76, 77 Secondary machining surface 78 Flange 81 Notch 82 Motor wire 84, 92, 95, 98 Screw hole 85a, 85b, 85c Land 86, 87 Swing race 88 Opening 89 Rail Grooves 91, 97 Mating surface 93 Guide groove 94 Guide hole 96 Rail groove 99 Convex portion

Claims (7)

[Claims] 1. An outer rotor type drive motor in which a rotor rotates, wherein a drive shaft of the drive motor is supported by a base housing, and the base housing can be swung with respect to a chassis. A three-dimensional drive motor device, wherein the drive shaft of the drive motor and the swinging part swing axis are orthogonal to each other without having any intersection. 2. An ultrasonic probe comprising a window case including an ultrasonic vibrator and an ultrasonic wave propagating medium and made of a window material having ultrasonic transparency, and a drive motor for driving the ultrasonic vibrator. The drive shaft of the drive motor that drives the ultrasonic vibrator mounted on the outer peripheral portion of the rotor frame of the drive motor, and the swing part that swings the base housing that supports the drive motor include a tip window of the ultrasonic probe. An ultrasonic vibrator drive motor device built in a case, wherein a drive shaft of the drive motor and a swing portion swing axis are orthogonal to each other without having an intersection. 3. An ultrasonic probe comprising a window case including an ultrasonic transducer and an ultrasonic wave propagation medium and made of a window material having ultrasonic transparency, and a drive motor for driving the ultrasonic transducer. The drive shaft of the drive motor that drives the ultrasonic vibrator mounted on the outer peripheral portion of the rotor frame of the drive motor, and the swing part that swings the base housing that supports the drive motor include a tip window of the ultrasonic probe. The drive shaft of the drive motor is built-in and supported by bearings. A swing part swing shaft is formed within the distance between the bearings, and the drive shaft of the drive motor and the swing part swing shaft are Rails having an oscillating radius of curvature are formed on both sides of the oscillating support portion of the base housing so that the base housing can oscillate at right angles without having an intersection, Ultrasonic transducer driving motor according to claim 2, wherein the dynamic motor has a structure comprising a chassis forming a guide portion for supporting the rails of the base housing is mounted. 4. An ultrasonic probe including an ultrasonic transducer and an ultrasonic wave propagation medium, and having a window case made of a window material having ultrasonic transparency and a drive motor for driving the ultrasonic transducer. The drive shaft of the drive motor and the swinging part swing axis are perpendicular to each other without any intersection, and the distance between the drive shaft and the swing axis is within one quarter of the inner radius of the window case. Claim 2,
4. The ultrasonic vibrator drive motor device according to 3. 5. An ultrasonic probe which includes an ultrasonic oscillator and an ultrasonic wave propagation medium, and includes a window case made of a window material having ultrasonic transparency and a drive motor for driving the ultrasonic oscillator. , the drive shaft and the oscillating member pivot shaft of the drive motor is perpendicular to the no intersection, the distance between the drive shaft and the pivot shaft (a e), _{(R sa -R mo) / e} <0 5. The ultrasonic vibrator drive motor device according to claim 2, wherein R _sa is a swing radius R _mo is an inner radius of the window case. 6. An ultrasonic diagnostic apparatus using the ultrasonic vibrator driving motor device according to claim 2, 3, 4, or 5. 7. An ultrasonic probe including a window case including an ultrasonic transducer and an ultrasonic wave propagation medium and made of a window material having ultrasonic transparency and a drive motor for driving the ultrasonic transducer. The ultrasonic vibrator is attached to the outer peripheral portion of the rotor frame of the drive motor, and the beam orbit plane (referred to as orbit plane a) of the ultrasonic vibrator rotated by the drive shaft of the drive motor is formed. An ultrasonic tomographic image of a human body can be obtained, and the base housing supporting the drive motor passes through a drive shaft with respect to the track plane a through a drive shaft (hereinafter referred to as a swing plane b).
Above, the base housing can swing, and a drive shaft of a drive motor that is mounted and driven by an ultrasonic vibrator and a swing part swing axis that swings a base housing that supports the drive motor have an intersection point. The ultrasonic vibrator drive motor device, which is orthogonal to each other, can be three-dimensionally displayed by synthesizing an ultrasonic tomographic image of an orbit plane at an arbitrary swing angle. Dimensional ultrasonic diagnostic equipment.