JP2001081504A - Powder metal parts having gear part, its manufacture, and device using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a powder metal parts by forming a metal parts having a gear part in a discontinuous range through the MIM(Metal Injection Molding method). SOLUTION: A metal parts of a partial gear part, one end of which on a tooth flank side is closed, is manufactured by the MIM. When a product of a U-shaped metal parts is obtained using two stay parts 58 and 59, and an oscillation supporting part, a connection part to connect two stay parts to the oscillation supporting part is provided on a gear part side in a compacted condition, and the connection part is removed after the sintering.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal powder part formed by a metal injection molding method on a metal part forming a gear portion in a discontinuous range, and a method for manufacturing the same and a method for manufacturing the same. The present invention relates to a used apparatus, for example, a three-dimensional ultrasonic diagnostic apparatus.

[0002]

2. Description of the Related Art In order to manufacture a complicated part, there has been a method such as resin molding. However, depending on the use environment such as the strength of the part, it may be necessary to use a metal part. In particular, metal parts are used for optical transmission parts and optical amplifier parts, fuel injection system parts for automobiles, medical equipment, and the like, whose market scale is expanding with the progress of optical communication.

[0003] The metal part is a metal injection molding method (metal powder injection molding method, Metal I
njection Molding (hereinafter referred to as MIM).

[0004] 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 metal processing method. The dimensional tolerance is about ± 0.05 mm for a general tolerance of 10 mm or less, and about ± 0.03 mm for a special tolerance. The precision cannot be obtained by other metal die casting.

[0005] This MIM technique is still a new technique, has a high manufacturing cost, is used in some fields, and watches and scalpels of medical equipment are well known.

[0006] Japanese Patent Application Laid-Open No. 9-154269 and
As disclosed in JP-A-154250 and JP-A-9-233737, a method for manufacturing a motor core is described as MI.
A component using M is configured.

[0007] As disclosed in Japanese Patent Application Laid-Open No. 9-233737, the core of the motor is generally in the form of a cylindrical portion because it is related to rotation, and has a slit for winding a coil. Specifically, since the split structure of the mold in the vertical method is used, the product shape is not so complicated, but it is important that the material to be used is a material through which magnetic flux can easily pass.

In JP-A-9-154269 and JP-A-9-154250, a motor core is manufactured for each piece by MIM, and the pieces are assembled into a motor. The piece forms a portion around which the coil is wound and a salient pole portion for converging the magnetic flux of the magnet, and has no components such as a gear portion. Since it has a purpose as a magnetic circuit member rather than a strength member, it is necessary that the material be easy to pass magnetic flux.

In Japanese Patent Application Laid-Open No. Hei 8-196091, a moving element of an ultrasonic actuator is manufactured by MIM, and a gear is formed on an outer peripheral portion of the moving element. This gear is formed on the entire circumference, and the torque transmission to this mover is performed by applying a signal to the piezoelectric body with the elastic body to which the piezoelectric body is joined, and the elastic body deforms and vibrates. Torque is transmitted to the moving member in pressure contact, and the moving member rotates about the center axis of the elastic body. With the rotation of the slider,
The torque is transmitted to the gear connected to the gear of the mover. Further, since the gear formed on the entire circumference does not have a part for regulating in the tooth surface direction, a mold for the gear part can be easily manufactured.

[0010] As shown in JP-A-10-155264 and JP-A-10-234172, the gear is formed over the entire circumference with respect to the rotating shaft. Since there is no member constrained in the gear tooth surface direction, hobbing for machining the gear is possible, and the manufacture of a mold such as MIM can be facilitated. Further, since the rotating shaft is formed by the hole, the accuracy of the gear can be measured by inserting the shaft. Since the gear is formed on the entire circumference, the diameter of the addendum circle, the diameter of the root circle, and the like can be directly measured.

Japanese Unexamined Patent Publication No. Hei 6-302098 proposes that a frame of a motor is formed by MIM, a cutting portion is reduced, a tool life is extended, and a frame is manufactured at low cost. A bearing insertion portion into which a bearing is inserted is formed in a central cylindrical portion of the frame. This frame does not move because it is fixed to the apparatus so that there is no component such as a gear portion or a component such as a swing rail.

As disclosed in Japanese Patent Application Laid-Open No. Hei 6-253498, a motor shaft is formed by MIM. For a shaft requiring a tolerance of several μm such as a shaft, MIM molding sintering is performed. In addition to the need for post-metal working and the need for a punch taper for mold release, cutting is necessary in most cases because the diameter of the shaft varies from place to place.

Further, as described in JP-A-9-87702 and JP-A-9-188570, MIM
When a metal part is manufactured by the method described above, a measure for stabilizing the shrinkage is described because part shrinkage occurs in a molded product during degreasing or sintering. In Japanese Patent Application Laid-Open No. 9-87702, since the density of the metal powder is partially different, the shrinkage ratio at the time of sintering is partially different. It controls the temperature of the mold so that nothing happens.

In order to reflect the shrinkage in the molding of the mold in consideration of the shrinkage, it is desired that the thickness is uniform and the density is uniform.

Japanese Patent Application Laid-Open No. 9-188570 describes a laying board for carrying out a degreasing step and a sintering step with a molded article (or molded article) placed thereon. There is a description that the warpage or the like of the laying board causes a reduction in the size of the molded body, and the method of placing the molded body on the laying board must also be sufficiently studied.

Japanese Patent Application Laid-Open No. 7-3304 discloses a method for manufacturing a comb-shaped part in order to prevent abnormal deformation during degreasing and sintering. After obtaining a molded body in which a connecting part formed by connecting part or all of the open part of the part is formed by a mold, this is degreased and sintered to obtain a metal sintered body, and thereafter, the connecting part is removed. This is a method for manufacturing a comb-shaped part. In this manufacturing method, the comb portions are connected.

Further, metal parts manufactured by MIM are used in medical equipment such as surgical scalpels. Medical devices are not often used in ultrasonic diagnostic equipment.

A conventional ultrasonic diagnostic apparatus will be described.

Ultrasonic probes for use in an ultrasonic diagnostic apparatus for a living body are roughly classified into a linear scanning method and a sector scanning method. The sector scanning method is mainly an electronic sector scanning method and a mechanical sector scanning method. There is. 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.

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.

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. Due to the rotation of the drive motor, the ultrasonic transmission / reception unit rotates about the shaft, and the beam of the ultrasonic transducer is reflected by the acoustic mirror, so the beam on the surface reflected with respect to the rotation 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 rotation axis because the tilt plane is generally 45 degrees. Since the drive motor is configured on the handle side compared to the ultrasonic transducer, an acoustic mirror that converts the axis of rotation to the rotation axis is required to rotate the mounting base of the ultrasonic transducer with the shaft. The beam trajectory plane is an ultrasonic tomographic image which 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, the ultrasonic transducer is mounted so as to extend radially with respect to the handle axis direction 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. The rotation of the drive motor causes the ultrasonic vibrator mount to rotate in accordance with the axis of the shaft, and the beam trajectory plane of the ultrasonic vibrator becomes a plane perpendicular to the rotation axis.

Since the drive motor is arranged on the handle portion side compared with the ultrasonic transducer, the beam trajectory plane is set in the handle axis direction of the ultrasonic probe in order to rotate the mount of the ultrasonic transducer with the shaft. An ultrasonic tomographic image, which is a plane perpendicular to the plane, is obtained.

JP-A-7-184888, JP-A-7-184888
Since the ultrasonic diagnostic apparatus described in JP-A-163562 and JP-A-7-289550 does not have another axis, only a two-dimensional ultrasonic tomographic image can be obtained.

The ultrasonic probe disclosed in Japanese Patent Publication No. 1-33733 includes a drive motor and a gear clutch for switching the rotation direction of the drive motor and transmitting the rotation to the vibrator in a probe main body. A rotation drive mechanism is built in. The ultrasonic vibrator connected by the signal cable can reciprocate and rotate by automatic or manual operation within a range of at least 180 degrees in the window case. This ultrasonic probe uses a gear clutch for switching the rotation direction of the ultrasonic transducer. Therefore, the tomographic image on the beam trajectory plane of the ultrasonic vibrator swings in a certain angle range because the movement is mechanically restricted.

[0026]

The MIM is a metal injection molding method capable of obtaining a complicated tertiary shape by mixing a metal powder and an organic binder and performing injection molding. For injection molding, a large amount of organic binder is required, and since the shrinkage in the degreasing and sintering steps after molding is large, the thickness of the parts is made uniform or the density is made uniform, Isotropic shrinkage is a major issue.

[0027] As in the present invention, in a metal part having a gear portion formed in a discontinuous range, since the gear portion of the metal part requires accuracy for torque transmission, abnormalities occur in the degreasing and sintering steps after molding. It is also an issue to prevent deformation.

Further, as in the present invention, the metal part is a U-shaped metal part composed of two pillars and a swing support part, and it is difficult to stably finish the spacing between the pillars in the degreasing and sintering steps.
Since the accuracy of the gear portion and the curvature of the sliding rail are not stable due to the variation in the interval between the support portions, the standard of the secondary processing such as metal processing changes, and the processing dimensional accuracy of the secondary processing varies. Issues arise.

As a method for preventing deformation during degreasing and sintering, for example, as described in JP-A-3-218983, a filling powder such as ceramic powder or the like is used to maintain the shape during degreasing and sintering. According to the method of embedding in the device, the interval between the pillar portions is not stable in the case of a U-shaped member having no symmetrical structure as in the present invention. Therefore, there is no other way than to enforce regulations.

As described in JP-A-3-13501, a method of using a jig for holding a shape has been proposed, but when applied to the present invention, a partial gear portion is held by a jig. It can be inferred from the contents of Japanese Patent Application Laid-Open No. 9-87702 that there is a problem that the density of the gear portion is increased by the holding jig and the accuracy of the sintered gear is deteriorated.

In order to prevent deformation due to friction generated on the laying plate surface and the degreased molding contact surface with the laying plate surface due to shrinkage during sintering described in the prior art of JP-A-7-3304. There is a method of laying ceramic powder on a laying plate, but if there is a partial gear as in the present invention, or if the support portion and the swinging support portion are U-shaped, lay the molded body on the laying plate as it is However, it is difficult to prevent deformation because the parts are not stable.

Japanese Patent Application Laid-Open No. 7-3304 discloses a method for manufacturing a comb-shaped component in order to prevent abnormal deformation during degreasing and sintering. After obtaining a molded body in which a connecting part formed by connecting part or all of the open part of the part is formed by a mold, this is degreased and sintered to obtain a metal sintered body, and thereafter, the connecting part is removed. This is a method for manufacturing a comb-shaped part. In this manufacturing method, since the comb portions are connected to each other, they are generated in the comb portions such as processing burrs at the time of the secondary processing.

The connecting portion must be a connecting portion which is not provided in a functional portion requiring accuracy and shape.

Many methods for preventing deformation during degreasing and sintering have been proposed. However, metal parts forming a gear portion in a discontinuous range, and further having a partial gear portion and a sliding rail are used. In order to obtain a U-shaped metal component product using the metal component, the two pillars, and the swing support portion, a technique of isotropic contraction is required. The present invention relates to a metal part forming a gear part in a discontinuous range, a metal part having a partial gear part and a sliding rail, and the like, a U-shape including two support parts and a swing support part. It is an object of the present invention to provide a manufacturing method capable of preventing deformation of a metal part product during degreasing and sintering, and a metal powder part having a shape with little deformation.

There is a problem to be solved in an ultrasonic diagnostic apparatus using a metal part made of MIM. By using a metal part made of MIM for the base housing, it is possible to move three-dimensionally. An object of the present invention is to provide an ultrasonic transducer drive motor device having a mechanism and an ultrasonic diagnostic apparatus using the same.

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, it can obtain only a two-dimensional ultrasonic diagnostic image.

A three-dimensional structure can be realized by rotating the entire components of the ultrasonic transducer and the drive motor for driving the same. However, in order to make the 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. Since the ultrasonic transducer is configured outside the range of the internal axis of the drive motor, it becomes a very large ultrasonic probe in order to make the mechanism to rotate the whole,
It will not be practically usable.

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.

Further, when a cable is directly connected to the ultrasonic vibrator, the measuring range is narrowed because the image range of the ultrasonic vibrator is limited, and the ultrasonic probe is inserted for diagnosis of an affected part. It is necessary to measure the image many times by changing the direction, and the range in which the diagnosis cannot be made mechanically increases.

By using the metal part of the present invention, the above-mentioned conventional problems can be solved, and ultrasonic scanning can be ensured three-dimensionally. A vibrator drive motor device and a three-dimensional scanning ultrasonic diagnostic apparatus using the same can be provided.

[0041]

According to the present invention, in order to achieve the above object, (1) a metal part forming a gear portion in a discontinuous range is formed by MIM. (2) A metal part which has a gear part, the gear part is formed with a gear in a part having a discontinuous range, and one surface of the gear orthogonal to the tooth surface of the gear part is covered with the same metal as MI.
M. (3) The central axis of the gear portion is a virtual axis of a hollow shaft, and the gear portion is formed by MIM of a metal part having a partial gear having a range not continuous with the central axis. (4) The center axis of the gear section is a swing axis. (5) On both sides of the swing support portion of the metal component, swing rails having an arc shape around the central axis are formed. (6) A metal part having a gear portion formed between two swing rails. (7) Prop portions are formed on both sides of the gear portion of the swing support portion, and a U-shaped metal part is formed by the two support portions and the swing support portion. (8) A cylindrical hole is formed at the tip of the two pillars. (9) A notch is provided in a part of the cylindrical hole at the tip of the two pillars. (10) The cylindrical holes at the tips of the two pillars are the rotation shafts of the motor device. (11) The rotation axis is orthogonal to the swing axis. (12) The two pillar portions and the swing support portion are U-shaped metal parts, and a portion (connecting portion) that connects the two pillar portions and the swing support portion is formed on the gear portion side. Is a shape that forms a plane perpendicular to the swing axis. (13) The metal component is stabilized by setting the connection plane of the connection portion to a surface to be placed on a laying plate of the component during degreasing or sintering in the forming process by MIM. (14) After sintering of the MIM, a portion (connecting portion) connecting the two support portions on the gear portion side and the swing support portion is removed by metal working, and the swing support portion having the gear portion and the two swing support portions are removed. A metal part having a shape composed of a support is formed by MIM.

That is, according to the present invention, a molded body having a U-shaped connection part provided partially from a kneaded body of a metal powder and a binder is obtained by a molding machine, and the molded body is degreased and sintered to obtain a sintered body. This is a manufacturing method in which a U-shaped part is obtained by forming a united body and then removing the connecting part by metal working. (15) The connecting portion is configured to be partially connected to the swing rail on the gear portion side. (16) A metal component having a partial gear formed of MIM was used for a base housing of an ultrasonic vibrator drive motor device. (17) An ultrasonic diagnostic apparatus is manufactured using an ultrasonic vibrator motor device using a MIM base housing. (18) The material of the base housing is a stainless steel material.

Using one or more of the above means, a metal part forming a gear portion in a discontinuous range is
Formed.

A metal base using the MIM is adopted for a motor device to produce a compact base housing.
By incorporating a three-dimensionally movable mechanism into the ultrasonic probe, a three-dimensional ultrasonic diagnostic apparatus capable of displaying three-dimensionally can be provided.

Although it cannot be realized only by the base housing made of MIM, it was realized because of the complicated MIM molded product.

Examples of the means will be described below.

The metal part is used for a base housing of an ultrasonic vibrator drive motor device, the ultrasonic vibrator and the ultrasonic wave propagating medium are included, and a window case made of a window material having ultrasonic transparency and the above-mentioned ultra-fine window material An ultrasonic probe having a drive motor for driving an ultrasonic vibrator, the metal part is applied, the ultrasonic vibrator is attached to an outer peripheral portion of a rotor frame of the drive motor, and rotated by a rotation axis of the drive motor. A base housing formed on a track plane (referred to as track plane a) of the ultrasonic vibrator and supporting a bearing of a drive motor extends on a plane perpendicular to the track plane a through a drive shaft. A rail having a swing radius of curvature is provided on the base housing so that the housing can swing, while supporting the swing of the base housing on which the drive motor is mounted. Ultrasonic transducers were receiving structure on the chassis forming the guide portion of the serial rail drive motor unit.

A three-dimensional ultrasonic diagnostic apparatus capable of displaying three-dimensionally by synthesizing an ultrasonic tomographic image of an orbit plane at an arbitrary swing angle with an ultrasonic vibrator drive motor device.

According to the present invention, the rotating shaft and the beam surface of the drive motor are swung in the window case by enclosing the sound wave propagation medium by the electro-mechanical scanning type ultrasonic transducer drive motor device for three-dimensional scanning. Ultrasonic drive motor device having two axes of swing axes for performing the operation, an ultrasonic tomographic image is obtained on a beam trajectory plane parallel to the handle axis of the ultrasonic probe, and the tomographic image is obtained. By swinging the base housing about the swing axis, a three-dimensional ultrasonic tomographic image can be synthesized and displayed.

The most distinctive feature of the MIM manufacturing method of the present invention is that, as described above, the shape of the MIM is not easily deformed in the degreasing / sintering process. , Sintering, and removing the connection after sintering. In particular, the U-shape between the supporting part of the metal part and the swing supporting part is U-shaped, and the spacing between the facing supporting parts varies, and the accuracy of the partial gear formed on the swing supporting part is affected by the deformation of the supporting part. There is provided a connecting portion connected to the support portion and the swing support portion so as not to cause the problem.

The connecting portion is provided on the gear portion side to prevent the accuracy of the gear portion from deteriorating.

Although the molded product with the connecting portion does not have the perfect product shape required in the molding and degreasing / sintering steps, it is also an issue to reduce the secondary processing as much as possible.

[0053]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is characterized in that the metal component is a metal powder component formed by a metal injection molding method, and has a gear portion.
The gear portion is a metal powder component having a gear portion characterized by forming a gear in a portion having a discontinuous range, and a gear strength that can not be obtained with resin or the like is obtained, and In addition to molding defects such as welds,
Since it is a partial gear, even if it is a complicated shape in which gear processing is difficult, as long as the mold can be released, there is an effect that a low-cost metal part can be formed by MIM molding.

According to a second aspect of the present invention, the metal component is a metal powder component formed by a metal injection molding method, and has a gear portion, and the gear portion has a gear portion that has a discontinuous range. 2. A metal powder component having a gear portion according to claim 1, wherein one surface of the gear orthogonal to the tooth surface of the gear portion is covered with the same metal. Because the end of is closed, the tooth surface cannot be machined with a gear cutter,
The MIM has an effect that a part can be created with high accuracy.

According to a third aspect of the present invention, the metal part is a metal powder part formed by a metal injection molding method, has a gear portion having a central axis, and the central axis of the gear portion is hollow. A metal powder part having a gear part, wherein the gear part is a virtual axis of the shaft, and the gear part is partially formed in a part having a range not continuous with the center axis. If the central axis of the gear is an imaginary axis, it is difficult to perform stable metal processing. However, since the metal is formed by MIM, a stable metal part is obtained by molding with a metal mold, and the gear is formed. Even if it is partial, it can be easily formed, and the accuracy of the gear with respect to the center axis is determined by the degree of contraction of the MIM, but has an effect that a sufficient one for use can be obtained.

According to a fourth aspect of the present invention, the metal component is a metal powder component formed by a metal injection molding method, has a gear portion having a central axis, and the central axis of the gear portion is hollow. The gear part is a virtual axis of the shaft, and the gear part partially forms a gear in a part that is not continuous with the center axis, and one surface of the gear perpendicular to the tooth surface of the gear part is the same metal 4. A metal powder part having a gear portion according to claim 3, wherein one end of the gear is closed, so that the tooth surface cannot be machined with a gear cutting machine. However, the MIM has an effect that a part can be created with high accuracy.

According to a fifth aspect of the present invention, the metal part is a metal powder part formed by a metal injection molding method, has a gear portion having a central axis, and the central axis of the gear portion is hollow. The gear part is a virtual axis of the shaft, and the gear part partially forms a gear at a part (hereinafter referred to as a swing support part) having a range not continuous with the center axis, and the swing support part of the metal part Is formed as a metal powder part having a gear part, characterized in that an arc-shaped swing rail is formed around a central axis, and the swing rail is formed on both sides of a swing support portion. When the rotational torque is transmitted to the gear, the metal component swings by using the swing rail as a guide. Since the swing rails are located on both sides of the swing support portion of the metal component, the swing movement is stabilized.

According to a sixth aspect of the present invention, the metal part is a metal powder part formed by a metal injection molding method, has a gear portion having a central axis, and the central axis of the gear portion is hollow. The gear part is a virtual axis of the shaft, and the gear part partially forms a gear at a part (hereinafter referred to as a swing support part) having a range not continuous with the center axis, and the swing support part of the metal part Is formed with an oscillating rail having an arc shape around a central axis, and the oscillating rail is formed on both sides of an oscillating support portion, a gear portion is formed between the oscillating rails, and a tooth surface of the gear portion is formed. One surface of the gear that is orthogonal to is connected to the swing support,
6. A metal powder part having a gear portion according to claim 5, wherein the gear is covered with the same metal, and since one end of the gear is closed, the tooth surface is machined with a gear cutting machine. However, the MIM has an effect that a part can be created with high accuracy.

According to a seventh aspect of the present invention, the metal part is a metal powder part formed by a metal injection molding method, has a gear having a central axis, and has a central axis (oscillation) of the gear. Is a virtual shaft of a hollow shaft, and the gear portion partially forms a gear at a portion (referred to as a swing support portion) having a range that is not continuous with respect to the center axis thereof. An oscillating rail having an arc shape around the central axis is formed on the oscillating support portion of the metal component, and the oscillating rail is formed on both sides of the oscillating support portion, and a gear portion of the oscillating support portion is formed. Support portions are formed on both sides, and cylindrical holes are formed at the tips of the two support portions. The center axes (rotational axes) of the holes of these support portions are relative to the swing axis of the gear. And the swinging support part which is orthogonal to the rotation axis is present on one side. It is a metal powder part having a gear part, which can transmit torque to the gear part, swing the metal part around the swing axis, and can rotate on the rotating shaft on the support part of the metal part Parts (for example, motors)
By attaching the MIM, the rotating shaft can be swung by swinging the metal component of the MIM, and the component rotatable by the rotating shaft can be swung. Since the swing axis and the rotation axis are orthogonal to each other, it is possible to swing a plane rotating with the rotation axis, and the figure formed by the rotation plane represents a three-dimensional space. Has an effect that the swing shaft and the rotation shaft can be configured.

According to an eighth aspect of the present invention, the metal part is a metal powder part formed by a metal injection molding method, and has a gear portion having a central axis, and the central axis of the gear portion (oscillation). Is a virtual shaft of a hollow shaft, and the gear portion partially forms a gear at a portion (referred to as a swing support portion) having a range that is not continuous with respect to the center axis thereof. An oscillating rail having an arc shape around the central axis is formed on the oscillating support portion of the metal component, and the oscillating rail is formed on both sides of the oscillating support portion, and a gear portion of the oscillating support portion is formed. 8. A pillar portion is formed on both sides, a cylindrical hole is formed at a tip portion of the two pillar portions, and a part of the cylindrical hole has a cutout. The metal powder part has a gear part. It can be inserted from the direction lacking Ri. The component to be inserted has an effect that even if the component is longer than the interval between the two support portions, it can be inserted.

According to a ninth aspect of the present invention, the metal part is a metal powder part formed by a metal injection molding method, and has a gear part having a central axis, and the central part of the gear part (oscillation). Is a virtual shaft of a hollow shaft, and the gear portion partially forms a gear at a portion (referred to as a swing support portion) having a range that is not continuous with respect to the center axis thereof. The gear portion is formed on one side of the swing support portion of the metal component, and a support portion is formed on both sides of the gear portion of the swing support portion, and the two support portions and the swing support portion form a U.
It is a metal part having a U-shape and is characterized in that a portion connecting the two support portions and the swing support portion is formed on the gear portion side, and a part of the portion forms a plane orthogonal to the swing axis. A metal powder component having a gear portion, and a metal component forming a gear portion in a discontinuous range is intended to obtain a U-shaped metal component product by two pillars and a swing support portion. In such a case, a portion (connecting portion) connecting the two support portions and the swing support portion is formed on the gear portion side in the state of the molded body, so that the degreasing is performed.
The deformation during sintering can be performed in a state of isotropic contraction as much as possible.

Since the connecting portion is formed on the gear portion side, the accuracy of the gear is stabilized.

Further, since the plane of the connecting portion is orthogonal to the swing axis, the plane is a surface on which a U-shape is projected, and is a surface that is not easily deformed even during degreasing and sintering. That is, 2
There is an effect that a product of a U-shaped metal part can be obtained as a shape with little deformation by the three support portions and the swing support portion.

According to a tenth aspect of the present invention, the metal component is a metal powder component formed by a metal injection molding method, and has a gear portion having a central axis.
The gear part has a central axis (hereinafter referred to as a swing axis) which is a virtual axis of a hollow shaft, and the gear part has a portion which is not continuous with the central axis (hereinafter referred to as a swing support part). The gear portion is formed on one side of the swing support portion of the metal part, and the support portion is formed on both sides of the gear portion of the swing support portion, and the two support portions are formed. It is a U-shaped metal part with the swing support part, and forms a part connecting the two support parts and the swing support part on the gear part side, and a part of the part forms a plane orthogonal to the swing axis. 10. A metal powder part having a gear part according to claim 9, wherein a connection plane of the part is a surface on which a part is placed during degreasing or sintering in a forming process by a metal injection molding method. Yes, due to shrinkage during sintering, it is generated on the surface of the It is possible to prevent the deformation by friction, also can be laid stably molded body laying plate.

In the case where there is a partial gear as in the present invention, or when the support and the swing support have a U-shape, the parts are not stable even if the molded body is laid on the laying plate as it is in the state of the connection. However, there is an effect that deformation can be prevented due to the presence of the connecting portion.

According to an eleventh aspect of the present invention, the metal component is a metal powder component formed by a metal injection molding method, and has a gear portion having a central axis.
The gear part has a central axis (hereinafter referred to as a swing axis) which is a virtual axis of a hollow shaft, and the gear part has a portion which is not continuous with the central axis (hereinafter referred to as a swing support part). The gear portion is formed on one side of the swing support portion of the metal part, and the support portion is formed on both sides of the gear portion of the swing support portion, and the two support portions are formed. It is a U-shaped metal part with the swing support part, and forms a part connecting the two support parts and the swing support part on the gear part side, and a part of the part forms a plane orthogonal to the swing axis. 11. A metal powder part having a gear portion according to claim 9, wherein one surface of the gear perpendicular to the tooth surface of the gear portion is connected to the swing support portion and is covered with the same metal. Since one end of the gear is closed, the tooth surface cannot be machined with a gear cutting machine. It has an effect of the M accurately can create components.

According to a twelfth aspect of the present invention, the metal part is a metal powder part formed by a metal injection molding method, and has a gear portion having a central axis.
The gear part has a central axis (hereinafter referred to as a swing axis) which is a virtual axis of a hollow shaft, and the gear part has a portion which is not continuous with the central axis (hereinafter referred to as a swing support part). The gear portion is formed on one side of the swing support portion of the metal part, and the support portion is formed on both sides of the gear portion of the swing support portion, and the two support portions are formed. It is a U-shaped metal part with the swing support part, and forms a part connecting the two support parts and the swing support part on the gear part side, and a part of the part forms a plane orthogonal to the swing axis. After the sintering by the metal injection molding method, a portion connecting the two support portions on the gear portion side and the swing support portion is removed by metal working, and the portion where the gear portion is formed from the swing support portion and the two support portions is removed. It is a metal powder part having a gear part characterized by being constituted, and in the product shape Since the shape is easily deformed in the degreasing and sintering process, a molded part is provided with a connecting part for reinforcement, and after the sintering, the connecting part is removed to produce a metal part product with less deformation. Is obtained. By providing the connecting portion connected to the support portion and the swing support portion, especially the support portion of the metal component and the swing support portion are U-shaped, the interval between the opposed support portions varies, and the swing support portion has The precision of the formed partial gear can be prevented from being affected by the deformation of the column. Further, this connecting portion is provided on the gear portion side, and has an effect that deterioration of accuracy of the gear portion can be prevented.

According to a thirteenth aspect of the present invention, the metal part is a metal powder part formed by a metal injection molding method, and has a gear portion having a central axis.
The central axis (hereinafter referred to as a swing axis) of the gear portion is a virtual axis of a hollow shaft, and the gear portion has a portion which is not continuous with the central axis (hereinafter referred to as a swing support portion). The gear portion is formed on one side of the swing support portion of the metal part, and the support portion is formed on both sides of the gear portion of the swing support portion, and the two support portions are formed. It is a U-shaped metal part with the swing support part, and forms a part connecting the two support parts and the swing support part on the gear part side, and a part of the part forms a plane orthogonal to the swing axis. After sintering by the metal injection molding method, a portion connecting the two support portions on the gear portion side and the swing support portion is removed by metal working or the like, and the swing support portion formed with the gear portion and the two support portions are removed. A method for manufacturing a metal powder part having a gear portion characterized by comprising Since the product shape is easily deformed in the degreasing and sintering process, a connecting part for reinforcement is provided on the molded product and molded, and after the sintering, the connecting part is deleted. The product of the metal part with few is obtained. By providing the connecting portion connected to the support portion and the swing support portion, especially the support portion of the metal component and the swing support portion are U-shaped, the interval between the opposed support portions varies, and the swing support portion has The precision of the formed partial gear can be prevented from being affected by the deformation of the column. Further, this connecting portion is provided on the gear portion side, and is a manufacturing method having an operation of preventing deterioration in accuracy of the gear portion. Claim 1
The invention described in Item 4 is a metal powder part formed by a metal injection molding method,
There is a gear part having a central axis, and the gear part is a virtual axis of a central axis (referred to as a swing axis) of a hollow shaft, and the gear part has a range that is not continuous with the central axis. A gear is partially formed on a portion (referred to as a swing support portion), and the gear portion is formed on one side of the swing support portion of the metal component. An arc-shaped oscillating rail is formed, and the oscillating rail is formed on both sides of the oscillating support portion, and a support portion is formed on both sides of a gear portion of the oscillating support portion. A cylindrical hole is formed between the two swing rails at the ends of the two support portions, and the center axis (the rotation axis) of the holes of these support portions is formed.
Is a U-shaped metal part which is orthogonal to the swing axis of the gear and has two columns and a swing support portion, and connects the two columns and the swing support portion to the gear portion side. Form the site,
A part of the part is a metal powder part having a gear part characterized by having a plane perpendicular to the oscillation axis, transmitting torque to the gear part, and forming a metal part around the oscillation axis. When a rotatable component (for example, a motor or the like) is attached to the supporting portion of the metal component on the rotating shaft, the rotating shaft can be swung by swinging the metal component of the MIM. A part rotatable around the rotating shaft can be swung. Since the swing axis and the rotation axis are orthogonal,
A plane that rotates on the rotation axis can be swung, and the figure formed by the rotation plane by the swing represents a three-dimensional space, and the swing axis and the rotation axis can be configured in the metal part of the MIM. .

When a metal part forming a gear part in a non-continuous range is to be obtained as a U-shaped metal part product by two pillars and a rocking support part, the gear part is formed in a molded state. The part connecting the two pillars and the swinging support on the side (connecting part)
By forming, deformation during degreasing and sintering can be performed in a state of isotropic contraction as much as possible.

Since the connecting portion is formed on the gear portion side, the accuracy of the gear is stabilized.

Further, since the plane of the connecting portion is orthogonal to the swing axis, the plane is a surface on which a U-shape is projected, and is a surface that is not easily deformed even during degreasing and sintering. That is, 2
There is an effect that a product of a U-shaped metal part can be obtained as a shape with little deformation by the three support portions and the swing support portion.

According to a fifteenth aspect of the present invention, the metal part is a metal powder part formed by a metal injection molding method, and has a gear having a central axis.
The gear part has a central axis (hereinafter referred to as a swing axis) which is a virtual axis of a hollow shaft, and the gear part has a portion which is not continuous with the central axis (hereinafter referred to as a swing support part). The gear part is formed on one side of the swing support part of the metal part, and the swing support part of the metal part is formed with a swing rail having an arc shape around a central axis. The oscillating rails are formed on both sides of the oscillating support portion, and form struts on both sides of a gear portion of the oscillating support portion, and the gear portion is present between the two oscillating rails. Cylindrical holes are formed at the tip portions of the two support portions, and the central axes (referred to as rotation axes) of the holes of these support portions are orthogonal to the swing axis of the gear, and the two support portions are provided. Part and a rocking support portion are a U-shaped metal part, forming a portion connecting the two support portions and the rocking support portion on the gear portion side, Part of the part is a plane orthogonal to the swing axis, and after sintering by the metal injection molding method, the part connecting the two support parts on the gear part side and the swing support part is deleted by metal processing, and the gear is removed. 15. A metal powder component having a gear portion according to claim 14, comprising a swing support portion having a portion formed therein and two support portions. The metal part can be swung around the moving axis, and when a rotatable part (for example, a motor) is attached to the supporting part of the metal part, the metal part of the MIM is swung so that the rotating shaft is rotated. It can be swung, and a part rotatable about a rotating shaft can be swung. Since the swing axis and the rotation axis are orthogonal to each other, it is possible to swing a plane rotating with the rotation axis, and the figure formed by the rotation plane represents a three-dimensional space. The swing shaft and the rotation shaft can be configured.

When a metal part forming a gear part in a discontinuous range is to be obtained as a U-shaped metal part product by two pillars and a rocking support part, the gear part is formed in a molded state. The part connecting the two pillars and the swinging support on the side (connecting part)
By forming, deformation during degreasing and sintering can be performed in a state of isotropic contraction as much as possible. Since the connecting portion is formed on the gear portion side, the accuracy of the gear is stabilized.

Further, since the plane of the connecting portion is orthogonal to the swing axis, the plane is a surface on which a U-shape is projected, and is a surface which is not easily deformed even during degreasing and sintering.

Since the product shape is easily deformed in the degreasing and sintering process, a connecting portion for reinforcement is provided on the molded article, molded, and after sintering, the connecting portion is deleted. A product of a metal part with little deformation can be obtained. By providing the connecting portion connected to the support portion and the swing support portion, especially the support portion of the metal component and the swing support portion are U-shaped, the interval between the opposed support portions varies, and the swing support portion has This has an effect that the accuracy of the formed partial gear can be prevented from being affected by the deformation of the support portion.

According to a sixteenth aspect of the present invention, the metal part is a metal powder part formed by a metal injection molding method, and has a gear portion having a central axis.
The gear part has a central axis (hereinafter referred to as a swing axis) which is a virtual axis of a hollow shaft, and the gear part has a portion which is not continuous with the central axis (hereinafter referred to as a swing support part). The gear part is formed on one side of the swing support part of the metal part, and the swing support part of the metal part is formed with a swing rail having an arc shape around a central axis. The oscillating rails are formed on both sides of the oscillating support portion, and form struts on both sides of a gear portion of the oscillating support portion, and the gear portion is present between the two oscillating rails. Cylindrical holes are formed at the tip portions of the two support portions, and the central axes (referred to as rotation axes) of the holes of these support portions are orthogonal to the swing axis of the gear, and the two support portions are provided. Part and a rocking support portion are a U-shaped metal part, forming a portion connecting the two support portions and the rocking support portion on the gear portion side, Part of the part is a plane orthogonal to the swing axis, and after sintering by the metal injection molding method, the part connecting the two support parts on the gear part side and the swing support part is deleted by metal processing, and the gear is removed. 16. A method for manufacturing a metal powder part having a gear portion according to claim 14, wherein the method comprises a swing support portion having a portion formed thereon and two support portions. Transmitting torque,
The metal part can be swung around the swing axis, and when a rotatable part (for example, a motor) is attached to the support part of the metal part, the metal part of the MIM is swung. Can be swung, and a component rotatable about the rotating shaft can be swung. Since the swing axis and the rotation axis are orthogonal to each other, it is possible to swing a plane rotating with the rotation axis, and the figure formed by the rotation plane represents a three-dimensional space. The swing shaft and the rotation shaft can be configured.

When a metal part forming a gear part in a discontinuous range is to be obtained as a U-shaped metal part product by using two pillars and a rocking support part, the gear part is formed in a molded state. The part connecting the two pillars and the swinging support on the side (connecting part)
By forming, deformation during degreasing and sintering can be performed in a state of isotropic contraction as much as possible. Since the connecting portion is formed on the gear portion side, the accuracy of the gear is stabilized.

Further, since the plane of the connecting portion is orthogonal to the swing axis, the plane is a surface on which a U-shape is projected, and is a surface that is not easily deformed even during degreasing and sintering.

Since the product shape is easily deformed in the degreasing / sintering process, a connecting portion for reinforcement is provided on the molded product, molded, and after sintering, the connecting portion is deleted. A product of a metal part with little deformation can be obtained. By providing the connecting portion connected to the support portion and the swing support portion, especially the support portion of the metal component and the swing support portion are U-shaped, the interval between the opposed support portions varies, and the swing support portion has This has an effect that the accuracy of the formed partial gear can be prevented from being affected by the deformation of the support portion.

According to a seventeenth aspect of the present invention, the metal part is a metal powder part formed by a metal injection molding method, and has a gear portion having a central axis.
The gear part has a central axis (hereinafter referred to as a swing axis) which is a virtual axis of a hollow shaft, and the gear part has a portion which is not continuous with the central axis (hereinafter referred to as a swing support part). An ultrasonic vibrator rocking motor device characterized by using a metal part having a gear formed in the base housing of the ultrasonic vibrator drive motor device, wherein the base housing supports the drive motor. The swing mechanism must be made compact, and the mechanism is complicated and the drive mechanism is inserted into the body cavity, so it becomes a small part and cannot be used for general turning. In order to obtain a possible shape, the rotating base is manufactured by the MIM method, which has an effect that the strength and the like are sufficient and a rotating base having a stable shape can be easily manufactured.

According to an eighteenth aspect of the present invention, the metal component is a metal powder component formed by a metal injection molding method, and has a gear portion having a central axis.
The gear part has a central axis (hereinafter referred to as a swing axis) which is a virtual axis of a hollow shaft, and the gear part has a portion which is not continuous with the central axis (hereinafter referred to as a swing support part). An ultrasonic diagnostic apparatus characterized by using a metal part having a gear formed in the base housing of the ultrasonic vibrator drive motor device, and using the ultrasonic vibrator motor device. The housing must support the drive motor and have a compact mechanism for swinging.The mechanism is complicated and the drive mechanism is inserted into the body cavity. In order to obtain a shape that cannot be achieved by conventional turning, etc., the rotating base is manufactured by the MIM method, and the strength is sufficient, and the rotating base having a stable shape can be easily manufactured. Have.

According to a nineteenth aspect of the present invention, the metal part is a metal powder part formed by a metal injection molding method, and the metal part is a metal part having the features of claims 1 to 16, The metal case is used for a base housing of an ultrasonic vibrator drive motor device, the ultrasonic vibrator and an ultrasonic wave propagation medium are included, and a window case made of a window material having ultrasonic transparency and the ultrasonic vibrator. The above-described metal parts are applied to an ultrasonic probe having a drive motor for driving the ultrasonic motor, an ultrasonic vibrator is attached to an outer peripheral portion of a rotor frame of the drive motor, and an ultrasonic wave is rotated by a rotation axis of the drive motor. A base housing formed on the track plane of the vibrator (referred to as track plane a) and supporting a bearing of the drive motor is perpendicular to the track plane a through the drive shaft. On the surface, a rail having a swing radius of curvature is provided on the base housing so that the base housing can swing, and guides the rail while supporting the swing of the base housing on which the drive motor is mounted. An ultrasonic vibrator drive motor device having a structure received by the formed chassis, 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. Since it is a mechanism, it can be made compact and three-dimensional. Since the handle axis and the chassis axis are oriented in the same direction, the beam trajectory plane of the ultrasonic transducer is perpendicular to the handle axis, and the beam trajectory plane is a plane parallel to the handle axis. An ultrasonic tomographic image serving as a certain scanning plane can be obtained. In addition, the swing axis is orthogonal to the drive axis and the swing plane is orthogonal to the beam trajectory plane. By swinging, the beam trajectory traces about the swing axis. be able to. Furthermore, since the base housing on which the swing motor is mounted has a rail for swing and the guide portion of the rail is received by the chassis, the strength of the swing portion of the base housing can be sufficiently secured. Having.

According to a twentieth aspect of the present invention, there is provided the ultrasonic vibrator drive motor device according to the nineteenth aspect, wherein the material of the base housing manufactured by the metal injection molding method is a stainless steel material. Yes, it has the effect of being resistant to oil and chemicals when used in an ultrasonic propagation medium, and of not having to worry about the generation of rust.

According to a twenty-first aspect of the present invention, the metal part is a metal powder part formed by a metal injection molding method, and the metal part is a metal part having the features of the first to sixteenth aspects, The metal case is used for a base housing of an ultrasonic vibrator drive motor device, the ultrasonic vibrator and an ultrasonic wave propagation medium are included, and a window case made of a window material having ultrasonic transparency and the ultrasonic vibrator. The above-described metal parts are applied to an ultrasonic probe having a drive motor for driving the ultrasonic motor, an ultrasonic vibrator is attached to an outer peripheral portion of a rotor frame of the drive motor, and an ultrasonic wave is rotated by a rotation axis of the drive motor. A base formed on the orbit plane (referred to as orbit plane a) of the vibrator, capable of obtaining an ultrasonic tomographic image of a human body on the orbit plane, and further supporting a bearing of a drive motor. The base housing has a swing radius of curvature so that the base housing can swing on a swing plane (referred to as a swing plane b) perpendicular to the track plane a through the drive shaft with respect to the track plane a. The ultrasonic vibrator drive motor device composed of a chassis formed with a guide portion for supporting the swing of the base housing, on which the drive motor is mounted, with the rail, is provided on the track plane at an arbitrary swing angle. 3 by combining ultrasonic tomographic images
This is a three-dimensional ultrasonic diagnostic apparatus that can be displayed three-dimensionally, and is a mechanism in which the ultrasonic vibrator is configured within the range of the internal axis of the drive motor according to the positional relationship between the drive motor and the ultrasonic vibrator. Because of this, a three-dimensional mechanism can be made compact. Since the handle axis and the chassis axis are oriented in the same direction, the beam trajectory plane of the ultrasonic transducer is perpendicular to the handle axis, and the beam trajectory plane is a plane parallel to the handle axis. An ultrasonic tomographic image serving as a certain scanning plane can be obtained. In addition, the swing axis is orthogonal to the drive axis and the swing plane is orthogonal to the beam trajectory plane. By swinging, the beam trajectory traces about the swing axis. be able to. 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.

[0085]

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

The ultrasonic diagnostic apparatus according to the embodiment comprises an ultrasonic probe and a main system unit. 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 in the radial direction with respect to the rotation axis. When the drive motor 3 rotates, the trajectory plane of the beams of the ultrasonic transducers 1 and 2 is a plane orthogonal to the rotation axis. That is, the axis perpendicular to the trajectory plane of the beam is the rotation 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 rotational position of the drive motor 3 can be known by using the reference position means as a reference for one rotation and the relative position information together with the position means. The reference position means includes a magnetic material pin (37 in FIG. 3) 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. 4) on the drive motor side and an MR element (41 in FIG. 4) on the base housing 4 side. The drive motor 3 is rotated and driven in several steps from 5 Hz to 17 Hz. In order to take out signals from the ultrasonic transducers 1 and 2 to the outside of the drive motor 3, a slip ring is formed in a rotor portion of the drive motor. The ultrasonic wave radiated from the ultrasonic transducer 1 (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.

In the conventional two-dimensional case, one axis is used.
In the case of the present embodiment, there are two shafts, a drive rotation shaft and a swing shaft.

The base housing 4 supporting the drive motor 3 has a swingable mechanism, and the swing plane is a plane orthogonal to the beam trajectory plane 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 are formed at the tip of the ultrasonic probe, and are entirely formed of a window case 9 made of a window material having ultrasonic transparency. It is included in the sound wave propagation medium.

[0092] 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. In order to be able to know the swing angle, the swing motor 5 is provided with an encoder 10 using an MR element having reference position information means and position information means.

A drive circuit 11 for driving the drive motor and a drive circuit 12 for driving the oscillating motor 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 are subjected to a three-dimensional image synthesizing process using the high-speed image DSP 20, and the image processing signal is output in a television format. It is displayed as an acoustic 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 so that it can be easily inserted 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 and the swing motor, an encoder, and the like. This cable connects the signal line and the signal line for shock detection to the main body of the ultrasonic diagnostic apparatus.It is protected by the cable coating, and only the input and output lines are shielded. Both ends of the main body of the ultrasonic diagnostic apparatus are grounded.

FIGS. 3 and 4 are structural diagrams of the ultrasonic vibrator driving motor device according to the present embodiment on the driving motor side. For description, casings such as a window case and a handle are omitted in FIGS.

3 and 4, reference numeral 3 denotes a driving 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 in 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 shaft 34 of the drive motor, and the ultrasonic vibrators 1 and 2 are mounted on the outer periphery of the rotor frame 35. The ultrasonic transducer is also called a transducer and is a core component of the ultrasonic probe. An acoustic lens 36 is provided at the tip of the ultrasonic transducer. 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. In addition to the concave acoustic lens, an ultrasonic transducer to which a flat acoustic lens or a convex acoustic lens is attached is used.

The beams of the ultrasonic transducers 1 and 2 are orthogonal to the rotation axis (shaft 34) of the drive motor 3 in the radial direction. The trajectory of the beam is therefore perpendicular to the axis of rotation. Although it is orthogonal to the rotation axis of the drive motor 3,
When considered as a swing center, an ultrasonic tomographic image of a beam trajectory plane parallel to the axis of the handle 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 pin 37 made of a magnetic material as a reference position means for finding reference position information.
It is attached to the outer peripheral portion of a rotor frame made of a magnetic material such as SUY or SUY. The pin 37 has a cylindrical portion attached to the rotor frame, and a cut surface 38 is provided on both sides so as to be 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. 3 and 4) that detects the pin 37 is attached to the base housing 4. The signal of the Z-phase MR element is supplied to a flexible printed circuit 39 (hereinafter referred to as a flexible substrate).
Connected to the electronic circuit board 28 through the electronic circuit board 2
8 is connected to the handle of the ultrasonic probe and further to the ultrasonic apparatus main body side.

An 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 flux of the main magnet on the encoder output, the encoder magnet 4
0, MR of AB phase attached to the base housing 4 side
The gap with the element 41 is set very small. Since the gap is narrow, it is necessary to reduce the influence of the encoder magnet 40 such as swelling. To this end, the ferrite content of the plastic magnet of the encoder magnet 40 is 79% or more containing a magnetic material in consideration of the swelling effect since it is used in the ultrasonic wave propagation medium.

When an oil containing an additive is used for the ultrasonic wave propagation medium, a plastic magnet other than 12 nylon, such as 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 to the handle portion of the ultrasonic probe and further to the ultrasonic apparatus main body side.

The transmission and reception signals to the ultrasonic vibrators 1 and 2 are provided outside the drive motor 3 by a slip ring 8. A rotary transformer may be used instead of the slip ring. The slip ring 8 has a required number of electrodes 42 with an insulating material such as an insulating sheet interposed therebetween on the drive motor side, and the ultrasonic transducers 1 and 2 are connected to the electrodes 42. The electrode 42 is a brush 4 for contacting and electrically connecting each electrode.
3 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 wires 82 of the drive motor 3 are also connected to the electronic circuit board 28 through the flexible board 47, and are connected from the electronic circuit board 28 to the handle portion of the ultrasonic probe and further to the ultrasonic apparatus main body.

A base housing 4 which supports the drive motor 3 so as to be capable of swinging rotation supports bearing portions on both sides of the drive motor and has a U-shape. The base housing 4 has a rail for swinging. 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 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 be swung by the swing motor.

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 oscillating motion.

Further, in order to reduce the sliding resistance, the electroless nickel-plating treatment with Teflon (registered trademark) is carried out using an electrolyte solution in which Teflon (registered trademark) is composited. 32. In some cases, the flat gear 31, the bevel gear 30, and the bevel gear 32, which are rocking gears, are subjected to an electroless nickel plating process containing boron.

[0111] Gear abrasion powder enters between the electrode of the slip ring and the brush and enters the signal of the ultrasonic vibrator as noise. Are paying.
In the case of copper-based materials, processing burrs are removed by pickling or the like.

The swing of the base housing 4 is provided on the base housing 4 so that the rail is rotatably supported by rail guide grooves of the chassis body 25 and the side chassis 26.
The chassis body 25 and the side chassis 26 are fixed by screws 27 and function as an integrated chassis.

The chassis body and the side chassis may be integrated.

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

Since the ultrasonic vibrators 1 and 2 are rotated by the drive motor 3, the trajectory plane of the beam of the ultrasonic vibrator at that time (referred to as a drive beam trajectory plane) is orthogonal to the rotation axis of the drive motor. It is. As can be seen from FIG. 3, the ultrasonic tomographic image acquisition area in the ultrasonic transducer array direction obtained by transmitting and receiving ultrasonic waves from the ultrasonic transducer is not 360-degree whole circumference but is hindered by the chassis body 25 and the side chassis 26. Being
A certain range. The range angle is α. The range represents an ultrasonic scannable area that can be scanned by the ultrasonic transducer. 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 vibrator is a drive motor 3 of a double-ended bearing.
Is mounted between the two bearings of the drive motor 3 because it is attached to the outer periphery of the rotor frame. Therefore, the ultrasonic tomographic image is orthogonal to the drive motor axis with respect to the drive rotation axis, and is not orthogonal to the handle axis.

Assuming that the swing range is the entire circumference, the range in which the tomographic image can be scanned out of the beam trajectory surface (hereinafter referred to as a oscillating beam trajectory surface) of the ultrasonic transducer due to the oscillating can be understood from FIG. A wide angle is possible due to the open space for the components such as the flexible substrate in the central portion where the chassis main body 25 and the side chassis 26 are combined, but depending on the range of gears formed on the base housing, The swing angle, which is subject to restrictions, is set to the same angle on both sides with the handle axis as the center, and if the range angle is β, the swing angle β is the 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 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. A three-dimensional region is obtained as a sound wave tomographic image.

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.
In addition, when the ultrasonic probe for three-dimensional scanning is used by inserting it into a body cavity, the ultrasonic transducer can be arranged at the distal end of the insertion portion, so that the insertion portion can be further miniaturized. Having.

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

Further, since two types of ultrasonic transducers can be mounted, one ultrasonic probe can be treated as having two 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 waves increases, so that diagnosis cannot be performed at a deep portion. Since ultrasonic transducers can be switched and used, better ultrasonic diagnosis can be performed.

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. Two ultrasonic vibrators are attached in pairs of 180 degrees so that the ultrasonic wave is received by the ultrasonic vibrator and does not enter the ultrasonic reception signal as noise. 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. 5 is a diagram for explaining a slip ring. In FIG. 5, the electrode 42 (same as the reference numeral in FIG. 4) is composed of three electrodes 42a, 42b, 43c, each of which is a polyester insulating sheet 48.
a, 48b, and 48c. The electrode 42 is formed by cutting or press-working brass by metal working and forming a projection 4 on the inside.
The protrusion 49 is provided with 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 electrode ring. When the lead wire is soldered, the solder stays at the stepped portion and does not flow to the ring side of the electrode. Therefore, when the slip ring is assembled, the electrode does not tilt due to the lamination during soldering. It has an effective effect such as not swinging with rotation.

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 electrical 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 about 180 degrees apart.

For two ultrasonic transducers, three electrodes are required. 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. 6 and 7 are views for explaining the relationship between the brush and the flexible substrate in the brush holder. 6 and 7, 44 is a brush holder, 43 is a brush, and 46 is a flexible substrate.

The brush holder 44 is made of an electric insulating material such as a phenol resin material, and has a screw hole 84 so that it can be attached to the base housing 4. The brush holder 44 has a concave portion 51 having a step corresponding to the thickness of the flexible substrate 46 at a position where the flexible substrate 46 is bonded and fixed. 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. Brush 4
3 is provided with a hole 53 to be attached. After attaching the brush 43 to the hole 53, the hole 53 is fixed with an adhesive. The I / O line flexible board 46 has brushes at positions corresponding to the three electrodes, and lands 85a, 85b, 85c for soldering the brush 43 to the flexible board.
Are not arranged at right angles to the brush. In the figure, land 85
a, 85b, 85c Change the location in the longitudinal direction of the brush,
A land 85a located inside the motor with the land 85b as the center is configured on the left side in FIG. 7, and a land 85c located outside the motor and close to the window case is shown in FIG.
Is configured on the right. For example, the pitch between the brushes is 0.688 mm and the brush wire diameter is 0.15 mm,
It is land diameter 0.3mm to arrange at right angles to the brush
And the workability of soldering becomes difficult.

Further, the flexible substrate 46 is a double-sided through-hole substrate. The electric ground line is provided on one side from a place slightly away from the 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 board 47 for the motor and the flexible boards 39 and 45 for the signal lines of the MR elements are connected to the electronic circuit board 28, while the flexible board 46 for the I / O lines is three. It goes out of the drive motor in a state of being stacked with the flexible substrates 47, 39, and 45. Therefore, the flexible substrate 4 of the I / O line
The electric ground plane of the flexible substrate 46 is disposed near the position information signal line so that unnecessary radiation generated from the signal line 6 does not jump into the signal line (referred to as a position information signal line) of the MR element.

The position information signal line of the drive motor which is 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. If noise enters from the flexible substrate, the position information becomes unstable and the control of the drive motor becomes unstable. However, since the flexible substrate 46 of the I / O is electrically shielded, it may be affected by the noise. There is no.

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 main body of the apparatus are correctly performed, 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) from a sintered metal.

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 metal processing method. The dimensional tolerance is about ± 0.05 mm for a general tolerance of 10 mm or less, and about ± 0.03 mm for a special tolerance. The precision cannot be obtained by other metal die casting. The base housing 4 of this embodiment (reference numeral 4 in FIGS. 3 and 4) has a complicated three-dimensional shape, and since the gear portion is partially formed, stability of dimensional accuracy is important. So, I made it with MIM.

In order to manufacture the MIM, the shape of the mold and the conditions for molding the product were examined at the following points. The manufactured parts are described in FIGS. 8 to 11 described later.

(1) Unnecessary portions were removed so that the thickness of the parts was as uniform as possible.

(2) In order to reduce the taper as much as possible with a flat gear, the gear portion was formed so that the resistance at the time of releasing the mold was reduced, and the tapered portion was tapered about once at a dimension allowed with high precision.

(3) Base housing 4 having many arc shapes
Therefore, in order to stabilize a molded product at the time of sintering, a portion having a shape that can be deleted by secondary processing is formed.

(4) Since the product size of the gear portion is reduced with respect to the mold release size in the process of mold release, degreasing, sintering, etc., the gear portion is hardly affected by the reduction. Mold 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. The added portion is provided on the gear side.

(7) Assuming the secondary processing, the rail portion has a shape that can be removed from the rail portion in a shape that can be deleted by the secondary processing.

(8) To reduce the number of secondary processing portions 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 in which a heated and melted thermoplastic substance is injected into a mold at high pressure and high speed and cooled to produce a part. Powder (metal powder) is pulverized, and the metal powder is kneaded with a binder or an organic substance such as a resin or wax that imparts fluidity, and the resulting material is heated and melted, granulated, and mixed with plastic. Similarly, injection molding is performed. 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, requires strength, has stable physical properties with respect to an ultrasonic wave propagation medium, and is made of austenitic stainless steel such as SUS303, SUS304, SUS30.
Non-ferrous material W such as 4L, SUS316, SUS316L
Materials that can use C-Co, W-Cu-Ni, W-Fe-Ni, Ti and the like can be selected.

As one example, the powder particle size is 5-10.
SUS316L stainless steel powder, which is a fine powder of 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 an example of the binder of the base housing 4, an acrylic resin and polystyrene were blended, and an experiment was carried out with a commonly used additive amount of about 40 vol%. As a result, a decrease in dimensions was observed. If the addition amount is about 1 vol%, the molding fluidity becomes poor, the injection molded product becomes defective, and parts are removed after degreasing or when placing the molded body in a vacuum furnace due to the influence of micro cracks and the like at the time of molding release. Is missing. The addition amount is set from the viewpoint of the molding stability of the molded body. The addition amount is set to about 3 to 30 vol% in order to improve the dimensional accuracy of the gear portion due to shrinkage when the molded body is sintered.

In the kneaded product of the metal powder and the binder, the gear tooth surface, the MR element mounting portion, and the brush holder mounting portion of the base housing 4 have a straight portion without a tapered portion. A small amount of additives such as are added.

FIGS. 8 and 9 are perspective views of a mold product (MIM blank product) of the base housing that is considered based on the points for designing the product shape and the mold product shape described above. FIG. 8 is a perspective view from the gear 33 side, and FIG. 9 is a perspective view from the opposite side of the gear 33. 8 and 9, the MIM blank 55 of the base housing has columns 58, 59 formed with holes 56, 57 for mounting a bearing for supporting the drive motor, and the hole 56 is a bearing support on the slip ring side. Two mounting holes 60 for fixing the brush holder with screws are provided in the pillar portion 58. The brush holder mounting portion surface 61 is manufactured without a taper so that the brush holder can be mounted so as not to be inclined in order to stably slide the brush and the electrode of the slip ring. I / O flexible substrate 46
In order to take out (FIG. 7) the outside of the base housing 55 (even in the case of the same meaning as the base housing 4 of FIG. 2, the reference numeral 55 is used for the description of FIGS. 8 and 9), the support portion 58 and the swing A hole 63 is formed near the boundary of the support portion 62 for passing an I / O flexible substrate having a shape similar to a rectangle. Since the connection strength of the support portion 58 tends to be weakened due to the hole 63, the connection portion between the swing support portion 62 and the support portion 58 is made as thick as possible so that the base housing 55 does not contact the brush. An inclined portion 64 is provided. The inclined portions 64 formed on both sides of the hole 63 improve the impact resistance of the column portion 58.

In the bearing mounting hole 57 of the column 59, a bearing on the encoder side is mounted. The hole 57 is a bearing support hole on the encoder side, and the support portion 59 is provided with two mounting holes 65 for fixing the AB-phase MR element mounting base with screws. The mounting surface of the AB-phase MR element mounting base is also a mold without taper so that the gap between the encoder magnet (40 in FIG. 4) and the AB-phase MR element (41 in FIG. 4) can be adjusted in parallel. Has been produced. AB phase MR
Hooks 66 are integrally formed on both sides of the column 59 with MIM to take out the flexible substrate connected to the element to the outside.

Rail portions are formed on both sides of the swing support portion 62 of the base housing 55 for swinging. The swing support portion 62 has a hole 67 for fixing a mount for the Z-phase MR element and a hole 68 for taking out the flexible substrate of the Z-phase MR element from the base housing.

The rail of the base housing is manufactured by adding a processing allowance to the dimensional accuracy in the secondary processing of the MIM blank 55.

The MIM blank 55 is used to reduce the shrinkage ratio when the molded body is fired and to improve the dimensional accuracy and to improve the dimensional accuracy of the component by reducing the porosity of the sintered body. The thickness of the inside of the swing support portion 62 and the like is adjusted so that the thickness becomes as uniform as possible.

A knock pin for releasing the mold was provided in the vicinity of the gear 33 in order to reduce the tooth taper of the gear 33 to zero.

The connection with the portion 72 which can be removed by the secondary processing is made up of a portion 69 connected to the tip of the column 58, a portion 70 connected to the tip of the column 59, and a 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 removed by the secondary processing is made large, the compact can be stably placed, and the work efficiency of the parts in the degreasing step and the sintering step is improved. In addition, the finished product is stable.

FIGS. 10 and 11 show the secondary processing MI of the product shape.
It is a perspective view of M goods. FIG. 10 is a perspective view from the gear portion, and FIG. 11 is a perspective view from the opposite side of the gear. FIG.
The secondary processed MIM products shown in FIGS.
FIG. 3 shows a base housing 4 used for an ultrasonic diagnostic apparatus by performing secondary processing on an M blank product. 8 and 9, the same reference numerals are used for parts. FIG. 12 shows a bearing collar.

In FIGS. 10 and 11, reference numeral 33 denotes a gear,
6, 57 are holes for supporting the bearings, 58, 59 are pillar portions, 60 is a mounting hole for fixing the brush holder, 62 is a swing support portion, 63 is a hole for an I / O flexible substrate, and 64 is a hole for a flexible substrate. Ramp,
65 is a mounting hole for mounting an AB phase MR element, 66 is a hook,
67 is a hole for fixing the Z-phase MR element, and 68 is a hole for taking out the Z-phase flexible substrate from the base housing.

The secondary processing will be described.

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

In order to mount the drive motor assembled with the distance between the bearing collars according to the dimensions on the base housing, the column portions 58, 59 are adjusted in accordance with the distance between the bearing collars.
Is subjected to secondary processing so that the inside of is not an inclined surface. Prop part 5
The inside of 8, 59 has a taper of about 1 degree in the MIM blank of the base housing. To assemble the drive motor, if the insides of the support portions 58 and 59 are tapered, trouble will occur in the motor assembly. The secondary processing surfaces of the support portions 58 and 59 are 76 and 77, respectively. The surface 77 cannot be expressed as a surface in the drawings of FIGS. 10 and 11, and a ridge line of a step is seen with the processing. Since the axial preload stably acts on the bearing, a highly reliable drive motor can be obtained.

As the large part of the secondary processing deletion part, the parts 69 to 72 are deleted by the secondary processing. In the same chuck as the removal work, the base housing swing race 8
Finish 6, 87. The swing race 86 indicates a race on the gear side of the base housing 4, and the swing race 87 indicates a race on the opposite side of the gear of the base housing 4.

Although the base housing has a three-dimensionally irregular shape, by examining the mold shape and the like, it is possible to obtain the required dimensional accuracy of the MIM mold molded product with almost no secondary processing. .

The bearing collar 75 shown in FIG. 12 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 column portion of the base housing, and prevents the drive motor from falling off or moving from the base housing.
On both sides of the flange 78, there are cylindrical portions 79, 80. Since the cylindrical portion 79 is incorporated in contact with the inner ring of the ball bearing of the drive motor, it has a size corresponding to the outer diameter of the inner ring. The cylindrical portion 80 is engaged with a hole provided in the column of the base housing. The cylindrical portion 80 is provided with notches 81 at two locations on the outer periphery of the cylindrical portion 80 for inserting a drive motor.

FIG. 13 is an explanatory view for engaging the bearing collar with a hole provided in the support column of the base housing. Because the bearing collar 75 is on both sides of the drive motor,
There are two. The bearing collar 75 distinguishes the bearing collar on the encoder side as 75a and the bearing collar on the slip ring side as 75b. When referring to both of the bearing collars, the description is made with reference numeral 75. FIG. 13 shows a bearing collar 75 for explanation of the hole 57 of the encoder side support 59.
a. The bearing collar 75b is not shown. FIG. 13A is an explanatory diagram of an insertion method for engaging the bearing collar 75a with the hole 57. The circular notch 57 provided in the column 59 of the base housing 4 has an insertion notch 88 in which a notch parallel to the swing support 62 is provided to the outside of the column. I have. The notch 81 of the bearing collar 75a is the notch 8 of the support 59.
8 and inserted from above the support portion 59. In practice, since the drive motor with the bearing collars mounted on both sides is inserted into the base housing, it is not the case that only the bearing collar is inserted alone, but the description will be made with the bearing collars for explanation. If a bearing collar can be inserted, a drive motor can also be inserted, and a drive motor will be built in a base housing. The motor wire 82 extends from the hollow portion of the shaft at the center of the bearing collar 75a.

FIG. 13B shows a bearing collar 75a.
It is an explanatory view in which the center of the bearing collar 75a is aligned with the center of the hole 57 of the support portion 59. The bearing collar 75a is rotated 90 degrees with its axes aligned, and the surface of the notch 81 of the bearing collar 75a is orthogonal to the surface of the notch 88 of the column 59. In this state, the bearing collar 75a does not fall off. That is, the drive motor is completely assembled in the base housing.

FIG. 14 is a perspective 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. 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 for mounting a bearing of a gear shaft for transmitting a swing torque to the base housing 25. The central portion of the chassis body 25 also serves as a connection portion with the side chassis, and the mating surface 91 with the side chassis affects the swing performance, so that the rail groove 89 is not inclined with respect to the swing axis. The processing and the processing of the mating surface 91 are performed with the same chuck. The mating surface has a screw hole 92 for attaching the side chassis, and further, a positioning parallel guide groove 93 for positioning with the side chassis is formed.

The chassis main body 25 has a guide hole 94 for mounting a bevel gear for transmitting the swing-side torque. This guide hole 94 is penetrated. Chassis body 25
Has a screw hole 95 for mounting an electronic circuit board.

The chassis main body 25 is cast by brass die-casting, and the cast product is metal-worked to finish to the required dimensional accuracy. In addition, the surface is subjected to electroless nickel plating treatment with Teflon because it is located at a place requiring sliding performance. In order to reduce the sliding resistance, the chassis main body 25 may be subjected to a process of performing electroless nickel plating with Teflon using an electrolyte solution in which Teflon is composited.
Further, the chassis body 25 may be subjected to an electroless nickel plating process containing boron.

The rail groove 89 of the chassis body 25 is used by being immersed in an ultrasonic wave propagation medium, and the electronic circuit board portion is in the air. Therefore, the chassis body 25 is also used as a sealing member. Since the airtightness of the chassis body is required, this chassis body uses a brass die-cast method used for watches and the like.

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

FIG. 15 is a perspective view of the side chassis.
The side chassis body 26 is provided with a rail groove 95 that guides and swings a swing rail of the base housing. The guide rail groove 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. By making the rail angle range of the rail groove 95 larger than the rail angle range of the base housing, the stability of swinging is increased. This is because the sliding resistance of the swing is stabilized.

The mating surface 96 with the chassis body affects the swinging performance, so that it does not have an inclination with respect to the swinging axis.
The processing of the rail groove 95 and the processing of the mating surface 96 are performed with the same chuck. The mating surface has a screw hole 97 for attaching the side chassis 26 to the chassis main body, and further has a convex portion 98 having a parallel portion engaging with a parallel guide groove for positioning the chassis main body for positioning with the chassis main body. Are engaged.

The side chassis 26 is also cast by brass die-casting similarly to the chassis main body 25, and the cast product is metal-worked and finished to the required dimensional accuracy. In addition, the surface is subjected to electroless nickel plating treatment with Teflon because it is located at a place requiring sliding performance. In order to reduce the sliding resistance, the side chassis 26 may be subjected to a process of performing 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 95 of the side chassis 26 is used by being immersed in an ultrasonic propagation medium, and the projection 98 is provided with an ultrasonic probe so as to be in the air. Because there is also a purpose of use,
Since the airtightness of the side chassis was required, a brass die-cast method was 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 three-dimensional scanning ultrasonic probe according to the first embodiment is lightweight and small, and has a main mechanism such as a swinging part and a driving part built in the tip of the probe. According to the ultrasonic transducer, an ultrasonic tomographic image in a wide angle range can be obtained. In addition, when the ultrasonic probe for three-dimensional scanning is used by inserting it into a body cavity, the ultrasonic transducer can be arranged at the distal end of the insertion portion, so that the insertion portion can be further miniaturized. Having.

It is possible to perform three-dimensional scanning by the three-dimensional scanning ultrasonic probe of this embodiment, and the rotation angle signal from the encoder on the drive motor side is superimposed with the rotation of the drive motor to which the ultrasonic transducer is fixed. The data is transmitted to the ultrasonic diagnostic apparatus, and 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.

[0183]

As is clear from the description of the above embodiment,
According to the first aspect of the present invention, a gear strength that cannot be obtained with a resin or the like can be obtained, there is no molding failure such as sink marks and welds, and since the gear is a partial gear, it has a complicated shape in which gear processing is difficult. Even so, if the structure allows the mold to be released, the advantageous effect that a low-cost metal part can be obtained by MIM molding can be obtained.

According to the second, fourth, sixth, and eleventh aspects of the present invention, since one end of the gear is closed, the tooth surface cannot be machined with a gear cutting machine. An effect that a part can be created can be obtained.

According to the third aspect of the present invention, if the central axis of the gear is an imaginary axis, it is difficult to perform metal processing stably. However, since the gear is formed by MIM, it is formed by a metal mold. Therefore, a stable metal part can be obtained, and even if the gear is partial, it can be easily formed. The accuracy of the gear with respect to the center axis is determined by the degree of shrinkage of the MIM, but a sufficient one for use is required. What you can get.

Further, according to the fifth aspect of the present invention, when the rotational torque is transmitted to the gear, the metal component swings with the swing rail as a guide. Since the swing rails are on both sides of the swing support portion of the metal component, an advantageous effect that the swing movement is stabilized can be obtained.

Further, according to the seventh aspect of the present invention, the torque can be transmitted to the gear portion, and the metal component can be swung around the swing shaft. When a possible component (for example, a motor or the like) is mounted, the rotating shaft can be swung by swinging the metal component of the MIM, and the rotatable component can be swung by the rotating shaft. Since the swing axis and the rotation axis are orthogonal to each other, it is possible to swing a plane rotating with the rotation axis, and the figure formed by the rotation plane represents a three-dimensional space. This has an advantageous effect that the swing shaft and the rotation shaft can be configured in the same manner.

According to the eighth aspect of the present invention, it is possible to insert a component rotating on the rotating shaft from a notch direction. An advantageous effect is obtained in that the part to be inserted can be inserted even if the part is longer than the interval between the two pillar portions.

According to the ninth aspect of the present invention, the metal part forming the gear part in a discontinuous range can be obtained as a U-shaped metal part product by the two pillar parts and the swing support part. In such a case, by forming a portion (connecting portion) connecting the two support portions and the swing support portion on the gear portion side in the state of the molded body, the deformation during degreasing and sintering is reduced as isotropic as possible. Can be done with

Since the connecting portion is formed on the gear portion side, the accuracy of the gear is stabilized.

Since the plane of the connecting portion is orthogonal to the swing axis, the plane is a surface on which a U-shape is projected, and is a surface that is not easily deformed even during degreasing and sintering. That is, 2
An advantageous effect is obtained in that a product of a U-shaped metal part can be obtained in a shape with little deformation by the three support portions and the swing support portion.

Further, according to the tenth aspect of the present invention, it is possible to prevent deformation due to friction generated on the laying plate surface due to shrinkage during sintering and the laying plate contact surface of the molded body after degreasing, Further, the molded body can be stably laid on the laying board.

In the case where there is a partial gear as in the present invention, or when the support and the swing support have a U-shape, the parts are not stable even if the molded body is laid on the spreading plate in the state of the connection. However, there is an advantageous effect that deformation can be prevented because of the connection portion.

According to the twelfth aspect of the present invention, since the shape of the product is easily deformed in the degreasing / sintering step, a connecting portion for reinforcement is provided on the molded product, and the product is molded. By removing the connecting portion after sintering, a product of a metal part with little deformation can be obtained. By providing the connecting portion connected to the support portion and the swing support portion, especially the support portion of the metal component and the swing support portion are U-shaped, the interval between the opposed support portions varies, and the swing support portion has The precision of the formed partial gear can be prevented from being affected by the deformation of the column. Further, since the connecting portion is provided on the gear portion side, an advantageous effect that accuracy deterioration of the gear portion can be prevented can be obtained.

According to the thirteenth aspect of the present invention, since the shape of the product is easily deformed in the degreasing / sintering step, a connecting portion for reinforcement is provided on the molded product, and the product is molded. By removing the connecting portion after sintering, a product of a metal part with little deformation can be obtained. By providing the connecting portion connected to the support portion and the swing support portion, especially the support portion of the metal component and the swing support portion are U-shaped, the interval between the opposed support portions varies, and the swing support portion has The precision of the formed partial gear can be prevented from being affected by the deformation of the column. Further, the connecting portion is provided on the gear portion side, and an advantageous effect is obtained that a manufacturing method capable of preventing deterioration in accuracy of the gear portion can be obtained.

According to the fourteenth aspect of the present invention, the torque can be transmitted to the gear portion, and the metal component can be swung around the swing shaft. When a possible component (for example, a motor or the like) is mounted, the rotating shaft can be swung by swinging the metal component of the MIM, and the rotatable component can be swung by the rotating shaft. Since the swing axis and the rotation axis are orthogonal to each other, it is possible to swing a plane rotating with the rotation axis, and the figure formed by the rotation plane represents a three-dimensional space. The swing shaft and the rotation shaft can be configured.

When a metal part forming a gear part in a non-continuous range is to be obtained as a U-shaped metal part product by using two pillars and a swinging support part, the gear part is formed in a molded state. The part connecting the two pillars and the swinging support on the side (connecting part)
By forming, deformation during degreasing and sintering can be performed in a state of isotropic contraction as much as possible.

Since the connecting portion is formed on the gear portion side, the accuracy of the gear is stabilized.

Since the plane of the connecting portion is orthogonal to the swing axis, the plane is a surface on which a U-shape is projected, and is a surface that is not easily deformed even during degreasing and sintering. That is, 2
An advantageous effect is obtained in that a product of a U-shaped metal part can be obtained in a shape with little deformation by the three support portions and the swing support portion.

[0200] According to the fifteenth aspect of the present invention, the torque can be transmitted to the gear portion, and the metal component can be swung around the swing shaft. When a possible component (for example, a motor or the like) is mounted, the rotating shaft can be swung by swinging the metal component of the MIM, and the rotatable component can be swung by the rotating shaft. Since the swing axis and the rotation axis are orthogonal to each other, it is possible to swing a plane rotating with the rotation axis, and the figure formed by the rotation plane represents a three-dimensional space. The swing shaft and the rotation shaft can be configured.

When the metal part forming the gear part in a discontinuous range is to be obtained as a U-shaped metal part product by the two support parts and the swing support part, the gear part is formed in the state of the molded body. The part connecting the two pillars and the swinging support on the side (connecting part)
By forming, deformation during degreasing and sintering can be performed in a state of isotropic contraction as much as possible. Since the connecting portion is formed on the gear portion side, the accuracy of the gear is stabilized.

Since the plane of the connecting portion is orthogonal to the swing axis, the plane is a surface on which a U-shape is projected, and is a surface that is not easily deformed even during degreasing and sintering.

Since the product shape is easily deformed in the degreasing and sintering process, a connecting portion for reinforcement is provided on the molded product, molded, and after sintering, the connecting portion is deleted. A product of a metal part with little deformation can be obtained. By providing the connecting portion connected to the support portion and the swing support portion, especially the support portion of the metal component and the swing support portion are U-shaped, the interval between the opposed support portions varies, and the swing support portion has An advantageous effect is obtained in that the precision of the formed partial gear can be prevented from being affected by the deformation of the support portion.

According to the sixteenth aspect of the present invention, the torque can be transmitted to the gear portion, and the metal component can be swung around the swing shaft. When a possible component (for example, a motor or the like) is mounted, the rotating shaft can be swung by swinging the metal component of the MIM, and the rotatable component can be swung by the rotating shaft. Since the swing axis and the rotation axis are orthogonal to each other, it is possible to swing a plane rotating with the rotation axis, and the figure formed by the rotation plane represents a three-dimensional space. The swing shaft and the rotation shaft can be configured.

When a metal part forming a gear part in a non-continuous range is to be obtained as a U-shaped metal part product by two pillars and a swing support part, the gear part is formed in a molded state. The part connecting the two pillars and the swinging support on the side (connecting part)
By forming, deformation during degreasing and sintering can be performed in a state of isotropic contraction as much as possible. Since the connecting portion is formed on the gear portion side, the accuracy of the gear is stabilized.

Since the plane of the connecting portion is orthogonal to the swing axis, the plane is a surface on which a U-shape is projected, and is a surface that is not easily deformed even during degreasing and sintering.

In the product shape, the shape is easily deformed in the degreasing / sintering process. Therefore, a connecting portion for reinforcement is provided on the molded article, molded, and after the sintering, the connecting portion is deleted. A product of a metal part with little deformation can be obtained. By providing the connecting portion connected to the support portion and the swing support portion, especially the support portion of the metal component and the swing support portion are U-shaped, the interval between the opposed support portions varies, and the swing support portion has An advantageous effect is obtained in that the precision of the formed partial gear can be prevented from being affected by the deformation of the support portion.

According to the seventeenth aspect of the present invention, the base housing must support the drive motor and have a compact mechanism for swinging the base housing. Because it is a drive mechanism to be inserted into
Since it becomes a small part and has a shape that is impossible with general turning, etc., the rotating base is manufactured by the MIM method,
An advantageous effect is obtained in that the strength and the like are sufficient and a rotating base having a stable shape can be easily manufactured.

According to the eighteenth aspect of the present invention, the base housing must support the drive motor and have a compact mechanism for swinging the base housing. Because it is a drive mechanism to be inserted into
Since it becomes a small part and has a shape that is impossible with general turning, etc., the rotating base is manufactured by the MIM method,
An advantageous effect is obtained in that the strength and the like are sufficient and a rotating base having a stable shape can be easily manufactured.

According to the nineteenth aspect of the present invention, since the ultrasonic vibrator is formed within the range of the internal axis of the drive motor in the positional relationship between the drive motor and the ultrasonic vibrator, the structure is compact. A three-dimensional mechanism can be realized. Since the handle axis and the chassis axis are oriented in the same direction, the beam trajectory plane of the ultrasonic transducer is perpendicular to the handle axis, and the beam trajectory plane is a plane parallel to the handle axis. An ultrasonic tomographic image serving as a certain scanning plane can be obtained. In addition, the swing axis is orthogonal to the drive axis and the swing plane is orthogonal to the beam trajectory plane. By swinging, the beam trajectory traces about the swing axis. be able to. Further, the base housing on which the swing motor is mounted has a rail for swing, and the guide portion of the rail is received by the chassis, so that the strength of the swing portion of the base housing can be sufficiently secured. Effects can be obtained.

According to the twentieth aspect of the present invention, there is an effect that when used in an ultrasonic wave propagation medium, it has oil resistance, chemical resistance, and no fear of rust. Things.

According to the twenty-first aspect of the present invention, since the ultrasonic vibrator is configured within the range of the internal axis of the drive motor in the positional relationship between the drive motor and the ultrasonic vibrator, the mechanism is compact. A three-dimensional mechanism can be realized. Since the handle axis and the chassis axis are oriented in the same direction, the beam trajectory plane of the ultrasonic transducer is perpendicular to the handle axis, and the beam trajectory plane is a plane parallel to the handle axis. An ultrasonic tomographic image serving as a certain scanning plane can be obtained. In addition, the swing axis is orthogonal to the drive axis and the swing plane is orthogonal to the beam trajectory plane. By swinging, the beam trajectory traces about the swing axis. be able to. Therefore, an ultrasonic tomographic image of a plurality of beam trajectory planes can be obtained, and these tomographic images can be synthesized and displayed as a three-dimensional image, thereby providing an advantageous effect that convenience of diagnosis can be improved. Can be

[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.

FIG. 3 is a structural diagram of a driving motor side of the ultrasonic vibrator driving motor device according to the embodiment of the present invention.

FIG. 4 is a structural diagram of a driving motor side of the ultrasonic vibrator driving motor device according to the embodiment of the present invention.

FIG. 5 is a diagram illustrating a slip ring according to an embodiment of the present invention.

FIG. 6 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. 7 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. 8 illustrates a MI of a base housing according to an embodiment of the present invention.
Perspective view from the gear side of M blank product

FIG. 9 shows an MI of a base housing according to an embodiment of the present invention.
Perspective view from the opposite side of the gear of the M blank product

FIG. 10 shows a base housing 2 according to an embodiment of the present invention.
Perspective view from the gear side of the next processed MIM product

FIG. 11 shows a base housing 2 according to an embodiment of the present invention.
Perspective view from the opposite side of the gear of the next processed MIM product

FIG. 12 is a perspective view of a bearing collar according to an embodiment of the present invention.

FIG. 13 is an explanatory view for engaging a bearing collar according to an embodiment of the present invention with a hole provided in a support portion of a base housing.

FIG. 14 is a perspective view of a chassis body according to an embodiment of the present invention.

FIG. 15 is a perspective view of a side chassis according to an embodiment of the present invention.

[Explanation of symbols]

 1, 2 Ultrasonic vibrator 3 Drive motor 4 Base housing 5 Swing motor 6 Handle shaft 7, 10 Encoder 8 Slip ring 9 Window case 11 Drive motor drive circuit 12 Swing motor drive circuit 13 Pulse generator 14 Vibrator 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 Reference Signs List 31 flat gear 33 gear provided in base housing 34 drive motor shaft 35 rotor frame 36 acoustic lens 37 pin 38 cut surface 39, 45, 46, 47 flexible substrate 40 encoder magnet 41 R element 42, 42a, 42b, 42c Electrode 43 Brush 44 Brush holder 48a, 48b, 48c Insulating sheet 49 Projection 50 Step 51 Depression 52 Surface of brush holder 53, 56, 57, 83, 90 Hole 55 MIM blank 58 Reference numeral 59 Support portion 60 Mounting hole for fixing the brush holder 61 Brush holder mounting portion surface 62 Swing support portion 63 I / O flexible substrate hole 64 Inclined portion 65 Mounting hole for mounting MR element 66 Hook 67 Fix Z-phase MR element Hole for removing from the base housing 68 Hole for removing from the base housing 69 Portion to be connected to the tip 70 Portion to be connected to the tip of the column 59 71 Portion to be connected to the gear side rail 72 Portion that can be removed by secondary processing 73 , 74 space 75 Bearing collar 75a Bearing collar on encoder side 75b Slip ring side Bearing collar 76, 77 Secondary processing surface 78 Flange 79, 80 Cylindrical part 81, 88 Notch 82 Motor wire 84, 92, 97 Screw hole 85a, 85b, 85c Land 86, 87 Swing rail 89, 95 Rail groove 91, 96 mating surface 93 guide groove 94 guide hole 98 protrusion

Claims (21)

[Claims] The metal part is a metal powder part formed by a metal injection molding method, has a gear portion, and the gear portion forms a gear in a portion having a discontinuous range. A metal powder component having a characteristic gear portion. 2. The metal part is a metal powder part formed by a metal injection molding method, has a gear part, and the gear part is formed with a gear in a part having a discontinuous range, and the gear part has a gear part. 2. The gear of claim 1, wherein one surface of the gear perpendicular to the tooth surface is covered with the same metal.
A metal powder part having the gear portion according to any one of the preceding claims. 3. The metal part is a metal powder part formed by a metal injection molding method, has a gear having a central axis, and the central axis of the gear is a virtual axis of a hollow shaft. A metal powder part having a gear portion, wherein the gear portion partially forms a gear at a portion having a range not continuous with the center axis. 4. The metal part is a metal powder part formed by a metal injection molding method, has a gear having a central axis, and the central axis of the gear is a virtual axis of a hollow shaft. , The gear part partially forms a gear in a portion having a range that is not continuous with the center axis,
The metal powder component having a gear portion according to claim 3, wherein one surface of the gear orthogonal to the tooth surface of the gear portion is covered with the same metal. 5. The metal part is a metal powder part formed by a metal injection molding method, has a gear having a central axis, and the central axis of the gear is a virtual axis of a hollow shaft. The gear portion partially forms a gear at a portion (hereinafter referred to as a swing support portion) having a range not continuous with the center axis, and the swing support portion of the metal part has a circle around the center axis. A metal powder component having a gear portion, wherein an arc-shaped swing rail is formed, and the swing rail is formed on both sides of a swing support portion. 6. The metal part is a metal powder part formed by a metal injection molding method, has a gear having a central axis, and the central axis of the gear is a virtual axis of a hollow shaft. The gear portion partially forms a gear at a portion (hereinafter referred to as a swing support portion) having a range not continuous with the center axis, and the swing support portion of the metal part has a circle around the center axis. An arc-shaped oscillating rail is formed, and the oscillating rail is formed on both sides of the oscillating support portion, a gear portion is formed between the oscillating rails, and one of the gears orthogonal to the tooth surface of the gear portion is formed. The metal powder component having a gear portion according to claim 5, wherein the surface is connected to the swing support portion and is covered with the same metal. 7. The metal part is a metal powder part formed by a metal injection molding method, has a gear portion having a central axis, and the central axis (referred to as a swing axis) of the gear portion is hollow. The gear part is a virtual axis of the shaft, and the gear part partially forms a gear at a part (hereinafter referred to as a swing support part) having a range not continuous with the center axis, and the swing support part of the metal part Is formed with an arc-shaped swing rail around the center axis, and the swing rail is formed on both sides of the swing support section, and forms a support section on both sides of the gear section of the swing support section. A cylindrical hole is formed at the tip of each of the two support portions, and the central axis (referred to as a rotation axis) of the holes of these support portions is orthogonal to the swing axis of the gear, and the rotation thereof is performed. Metal powder having a gear portion, characterized in that the swing supporting portion with respect to the shaft is present on one side. parts. 8. The metal part is a metal powder part formed by a metal injection molding method, has a gear portion having a central axis, and the central axis (referred to as a swing axis) of the gear portion is hollow. The gear part is a virtual axis of the shaft, and the gear part partially forms a gear at a part (hereinafter referred to as a swing support part) having a range not continuous with the center axis, and the swing support part of the metal part The swinging rail is formed on both sides of the swinging support part, and the swinging rail is formed on both sides of the gearing part of the swinging support part. 8. A metal powder having a gear portion according to claim 7, wherein a cylindrical hole is formed at a tip portion of each of the two support portions, and a part of the cylindrical hole has a notch. parts. 9. The metal part is a metal powder part formed by a metal injection molding method, has a gear portion having a central axis, and the central axis (referred to as a swing axis) of the gear portion is hollow. The gear part is a virtual axis of the shaft, and the gear part partially forms a gear at a part (hereinafter referred to as a swing support part) having a range not continuous with the center axis, and the gear part is formed of a metal part. The supporting member is formed on one side of the swing support portion, and the support portion is formed on both sides of the gear portion of the swing support portion.
U-shaped metal part with one support part and the swing support part. A part that connects the two support parts and the swing support part is formed on the gear part side, and a part of the part is orthogonal to the swing axis. A metal powder part having a gear portion, wherein the metal powder part has a flat surface. 10. The metal part is a metal powder part formed by a metal injection molding method, has a gear having a central axis, and the gear has a hollow central axis (referred to as a swing axis). The gear part is a virtual axis of the shaft, and the gear part partially forms a gear at a part (hereinafter referred to as a swing support part) having a range not continuous with the center axis, and the gear part is formed of a metal part. It is a U-shaped metal part that is formed on one side of the swing support portion, and that has support portions formed on both sides of the gear portion of the swing support portion, and the two support portions and the swing support portion. A part connecting the two support parts and the swing support part is formed on the gear part side, and a part of the part forms a plane perpendicular to the swing axis, and the connection plane of that part is formed by the metal injection molding method The feature is that it is on the surface where parts are placed during degreasing and sintering A metal powder part having a gear portion according to claim 9. 11. The metal part is a metal powder part formed by a metal injection molding method, has a gear part having a central axis, and the gear part has a hollow central axis (hereinafter referred to as a swing axis). The gear part is a virtual axis of the shaft, and the gear part partially forms a gear at a part (hereinafter referred to as a swing support part) having a range not continuous with the center axis, and the gear part is formed of a metal part. It is a U-shaped metal part that is formed on one side of the swing support portion, and that has support portions formed on both sides of the gear portion of the swing support portion, and the two support portions and the swing support portion. A portion connecting the two support portions and the swing support portion is formed on the gear portion side, and a portion of the portion forms a plane perpendicular to the swing axis, and one surface of the gear orthogonal to the gear surface of the gear portion is formed. 11. The device according to claim 9, which is connected to the swing support portion and is closed by the same metal. Metal parts having a gear portion. 12. The metal part is a metal powder part formed by a metal injection molding method, has a gear having a central axis, and the gear has a hollow central axis (hereinafter referred to as a swing axis). The gear part is a virtual axis of the shaft, and the gear part partially forms a gear at a part (hereinafter referred to as a swing support part) having a range not continuous with the center axis, and the gear part is formed of a metal part. It is a U-shaped metal part that is formed on one side of the swing support portion, and that has support portions formed on both sides of the gear portion of the swing support portion, and the two support portions and the swing support portion. A portion connecting the two support portions and the swing support portion is formed on the gear portion side, and a portion of the portion forms a plane orthogonal to the swing axis, and after sintering by the metal injection molding method, the portion on the gear portion side is formed. The part connecting the two support parts and the swing support part is A metal powder component having a gear portion, comprising: a swing support portion having an a portion formed thereon; and two support portions. 13. The metal part is a metal powder part formed by a metal injection molding method, has a gear portion having a central axis, and the central axis of the gear portion (referred to as a swing axis) is hollow. The gear part is a virtual axis of the shaft, and the gear part partially forms a gear at a part (hereinafter referred to as a swing support part) having a range not continuous with the center axis, and the gear part is formed of a metal part. It is a U-shaped metal part that is formed on one side of the swing support portion, and that has support portions formed on both sides of the gear portion of the swing support portion, and the two support portions and the swing support portion. A portion connecting the two support portions and the swing support portion is formed on the gear portion side, and a portion of the portion forms a plane orthogonal to the swing axis, and after sintering by the metal injection molding method, the portion on the gear portion side is formed. Remove the part connecting the two support parts and the swing support part with metalwork etc. A method of manufacturing a metal powder part having a gear portion, comprising a swing support portion having a gear portion and two support portions. 14. The metal part is a metal powder part formed by a metal injection molding method, has a gear having a central axis, and the gear has a hollow central axis (hereinafter referred to as a swing axis). The gear part is a virtual axis of the shaft, and the gear part partially forms a gear at a part (hereinafter referred to as a swing support part) having a range not continuous with the center axis, and the gear part is formed of a metal part. The swing support portion is formed on one side of the swing support portion, and the swing support portion of the metal part is formed with a swing rail having an arc shape around a central axis, and the swing rail is formed on both sides of the swing support portion. And a column is formed on both sides of the gear portion of the swing support portion, and the gear portion exists between the two swing rails,
Cylindrical holes are formed at the tip portions of the two support portions, and the center axes (rotational axes) of the holes of these support portions are orthogonal to the swing axis of the gear, and the two The support portion and the swing support portion are a U-shaped metal part, and a portion connecting the two support portions and the swing support portion is formed on the gear portion side, and a part of the portion is orthogonal to the swing axis. A metal powder part having a gear portion characterized by being flat. 15. The metal part is a metal powder part formed by a metal injection molding method, has a gear having a central axis, and the gear has a hollow central axis (hereinafter referred to as a swing axis). The gear part is a virtual axis of the shaft, and the gear part partially forms a gear at a part (hereinafter referred to as a swing support part) having a range not continuous with the center axis, and the gear part is formed of a metal part. The swing support portion is formed on one side of the swing support portion, and the swing support portion of the metal part is formed with a swing rail having an arc shape around a central axis, and the swing rail is formed on both sides of the swing support portion. And a column is formed on both sides of the gear portion of the swing support portion, and the gear portion exists between the two swing rails,
Cylindrical holes are formed at the tip portions of the two support portions, and the center axes (rotational axes) of the holes of these support portions are orthogonal to the swing axis of the gear, and the two The support portion and the swing support portion are a U-shaped metal part, and a portion connecting the two support portions and the swing support portion is formed on the gear portion side, and a part of the portion is orthogonal to the swing axis. After sintering by the metal injection molding method, a part connecting the two pillars on the gear part side and the swing support part is removed by metal working, and the swing support part with the gear part formed and two 15. The metal powder component having a gear portion according to claim 14, comprising a support portion. 16. The metal part is a metal powder part formed by a metal injection molding method, has a gear portion having a central axis, and the gear portion has a hollow central axis (hereinafter referred to as a swing axis). The gear part is a virtual axis of the shaft, and the gear part partially forms a gear at a part (hereinafter referred to as a swing support part) having a range not continuous with the center axis, and the gear part is formed of a metal part. The swing support portion is formed on one side of the swing support portion, and the swing support portion of the metal part is formed with a swing rail having an arc shape around a central axis, and the swing rail is formed on both sides of the swing support portion. And a column is formed on both sides of the gear portion of the swing support portion, and the gear portion exists between the two swing rails,
Cylindrical holes are formed at the tip portions of the two support portions, and the center axes (rotational axes) of the holes of these support portions are orthogonal to the swing axis of the gear, and the two The support portion and the swing support portion are a U-shaped metal part, and a portion connecting the two support portions and the swing support portion is formed on the gear portion side, and a part of the portion is orthogonal to the swing axis. After sintering by the metal injection molding method, a part connecting the two pillars on the gear part side and the swing support part is removed by metal working, and the swing support part with the gear part formed and two The method for producing a metal powder part having a gear part according to claim 14, wherein the method comprises a support part. 17. The metal part is a metal powder part formed by a metal injection molding method, has a gear part having a central axis, and the gear part has a hollow central axis (referred to as a swing axis). A metal part which is a virtual axis of a shaft and whose gear part is partially formed with a gear in a part (hereinafter referred to as a swing support part) having a range not continuous with its central axis,
An ultrasonic oscillator rocking motor device used for a base housing of an ultrasonic oscillator drive motor device. 18. The metal part is a metal powder part formed by a metal injection molding method, has a gear having a central axis, and the gear has a hollow central axis (hereinafter referred to as a swing axis). A metal part which is a virtual axis of a shaft and whose gear part is partially formed with a gear in a part (hereinafter referred to as a swing support part) having a range not continuous with its central axis,
An ultrasonic diagnostic apparatus which is used for a base housing of an ultrasonic vibrator drive motor device and uses the ultrasonic vibrator motor device. 19. The metal part is a metal powder part formed by a metal injection molding method, wherein the metal part is a metal part having the features of claims 1 to 16, and the metal part is subjected to ultrasonic vibration. Used in the base housing of the child drive motor device, contains an ultrasonic transducer and an ultrasonic propagation medium, a window case made of a window material having ultrasonic transparency, and a drive motor for driving the ultrasonic transducer. The above-mentioned metal parts are applied to the provided ultrasonic probe, the ultrasonic vibrator is attached to the outer peripheral portion of the rotor frame of the drive motor, and the orbit plane (orbit) of the ultrasonic vibrator rotated by the rotation axis of the drive motor The base housing is formed on a plane perpendicular to the track plane a through the drive shaft. A rail having a swing radius of curvature is provided on the base housing so that the jing can swing, and the rail is guided by a chassis formed with a guide portion for the rail while supporting the swing of the base housing on which the drive motor is mounted. Ultrasonic transducer drive motor device with structure. 20. The ultrasonic vibrator drive motor device according to claim 19, wherein the material of the base housing manufactured by the metal injection molding method is a stainless steel material. 21. The metal part is a metal powder part formed by a metal injection molding method, wherein the metal part is a metal part having the features of claims 1 to 16, and the metal part is subjected to ultrasonic vibration. Used in the base housing of the child drive motor device, contains an ultrasonic transducer and an ultrasonic propagation medium, a window case made of a window material having ultrasonic transparency, and a drive motor for driving the ultrasonic transducer. The above-mentioned metal parts are applied to the provided ultrasonic probe, the ultrasonic vibrator is attached to the outer peripheral portion of the rotor frame of the drive motor, and the orbit plane (orbit) of the ultrasonic vibrator rotated by the rotation axis of the drive motor And a base housing for supporting the bearing of the drive motor is provided on the track plane. A rail having a swing radius of curvature is provided on the base housing so that the base housing can swing on a swing plane (hereinafter referred to as a swing plane b) perpendicular to the drive shaft through the drive shaft. The ultrasonic transducer drive motor device, which is composed of a chassis formed with a guide portion for supporting the swing of the base housing on which the drive motor is mounted by rails, can be used to obtain an ultrasonic tomographic image of the orbit plane at an arbitrary swing angle. 3 that can be displayed three-dimensionally by combining images
Dimensional ultrasonic diagnostic equipment.