JP2001135950A - Cord device and x-ray imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cord device that does not apply excessive force to a cord, improves durability, and allows smooth rotation at a turning side. SOLUTION: Between an external cylinder 64 and an internal one 63 which is turned in the external cylinder 64, a spiral guide 65 is provided spirally for dividing and forming a spiral groove 66. One end side of a cord 62 is supported at the internal cylinder 63, and the other is led from the side of the external cylinder 64, and a middle part is arranged spirally along the inside of the spiral groove 66. When the internal cylinder 63 is turned with respect to the external cylinder 64, the spiral middle part of the cord 62 is extended and shrunk in the spiral groove 66, thus preventing excessive force from being applied to the cord 62, and allowing the smooth turning of the internal cylinder 63 with respect to the external cylinder 64.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cord device and an X-ray imaging device for connecting a rotating side and a fixed side with a cord.

[0002]

2. Description of the Related Art Conventionally, for example, in an X-ray imaging apparatus,
In order to photograph the patient from each direction, the apparatus body equipped with a camera is moved with respect to the patient, and at this time, the image taken by the camera according to the photographing direction from the place where the apparatus body has moved. It is necessary to change the direction by, for example, 90 °, and the camera is configured to rotate around the optical axis with respect to the apparatus main body. Then, the camera converts the X-ray image into an electric signal, and sends the electric signal to the apparatus main body through a cord connected to the camera.

[0003]

However, since one end of the cord is connected to the camera which is a rotating side and the other end of the cord is connected to the apparatus body which is a fixed side, when the camera is rotated, The one end of the cord rotates together with the camera, but the other end of the cord is restricted from rotating by the apparatus main body, and an excessive force is applied to the cord to cause kinking, lowering the durability of the cord, The smooth rotation of the camera may be hindered.

[0004] The present invention has been made in view of such a point, and it is possible to improve the durability without exerting an excessive force on a cord.
It is an object of the present invention to provide a cord device and an X-ray imaging device that allow smooth rotation on the rotation side.

[0005]

According to a first aspect of the present invention, there is provided a cord device comprising: a rotating inner cylinder; a cord having an intermediate portion spirally disposed around the inner cylinder and one end connected to the inner cylinder;
The other end of the cord is led out, and around the inner cylinder, covers the helical intermediate portion of the cord, and the helical diameter of the helical intermediate portion of the cord is expandable and contractable with the rotation of the inner cylinder. And an outer cylinder disposed with a gap therebetween.

[0006] Even if one end of the cord is on the inner cylinder and the other end is on the outer cylinder, the middle part of the cord is spirally arranged between the outer cylinder and the inner cylinder, and the helical diameter of the cord is enlarged or reduced. As the inner cylinder rotates with respect to the outer cylinder, the helical middle part of the cord expands and contracts to absorb the twisting of the cord, and no excessive force is applied to the cord. To allow the inner cylinder to rotate smoothly.

According to a second aspect of the present invention, there is provided a cord device in which a rotating inner cylinder, a cord having an intermediate portion spirally disposed around the inner cylinder and one end connected to the other end, and the other end of the cord being led out. Around the inner cylinder, there is provided a gap that covers the helical intermediate portion of the cord and that allows the helical diameter of the helical intermediate portion of the cord to expand and contract with the rotation of the inner cylinder. And a spiral groove in which a spiral intermediate portion of the cord is disposed between the inner cylinder and the outer cylinder. It has a spiral guide.

[0008] Even if one end of the cord is on the inner cylinder and the other end is on the outer cylinder, the middle part of the cord is helically arranged in the spiral groove between the outer cylinder and the inner cylinder. Since the helical diameter can be expanded and contracted in the helical groove, the helical middle part of the cord expands and contracts when the inner cylinder is rotated with respect to the outer cylinder, thereby absorbing the occurrence of kinking of the cord and making it impossible for the cord. No force is applied, and smooth rotation of the inner cylinder with respect to the outer cylinder is allowed.

According to a third aspect of the present invention, there is provided a cord device according to the second aspect, wherein at least one of the inner surface of the outer cylinder, the outer surface of the inner cylinder, the surface of the spiral guide, and the cord has a small coefficient of friction. A surface layer is formed.

[0010] Since a surface layer having a small friction coefficient is formed on at least one of the inner surface of the outer cylinder, the outer surface of the inner cylinder, the surface of the spiral guide, and the cord, the outer cylinder, the inner cylinder, and the spiral guide are formed. The contact resistance between the cord and the cord is reduced, and the expansion and contraction of the spiral intermediate portion of the cord is made smooth.

An X-ray imaging apparatus according to a fourth aspect of the present invention includes a main body of the apparatus, a camera rotatably mounted around the optical axis with respect to the main body of the apparatus, and which captures an X-ray image. The cord according to any one of claims 1 to 3, wherein a camera rotating means for rotating a camera, an inner cylinder is attached to the camera side, one end of the cord is connected, and an outer cylinder is attached to the apparatus body. And a device.

Since the cord device according to any one of claims 1 to 3 is provided, the inner cylinder is attached to the camera and the outer cylinder is attached to the apparatus main body, so that the camera can be smoothly rotated with respect to the apparatus main body.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a code apparatus and an X-ray image apparatus according to the present invention.

FIG. 1 is a bottom view of a part of the X-ray imaging apparatus.
FIG. 2 is a side view showing a part of the X-ray imaging apparatus, and FIG.
It is a front view showing the whole line image device.

1 to 3, an X-ray imaging apparatus 11 includes an apparatus main body 12, a collimator lens 13, a focus adjusting device 14, and an image intensifier tube (not shown).
Then, for example, the X-rays that have passed through the patient are received by an image intensifier and converted into light output. , And is guided to a camera 15 built in the apparatus main body 12. The camera 15 is configured to convert a captured X-ray image into an electric signal and output the electric signal.

The apparatus main body 12 has a base 21, and the base 21
A holder 23 is fixed to the inner periphery of the opening 22, and a front side (FIG. 1) is formed on the inner periphery of the holder 23.
The left side, which is the input side of the X-ray image, will be described hereinafter with the left end on the left side in FIG. 1 as the front and the other end on the right side in FIG.
The bearing 24 is held in the holder 23 by a bearing retainer 25 attached to the front surface of the holder. bearing
A lens holding cylinder 26 is fitted into the inner circumference of the lens 24 from the rear side, and the lens holding cylinder 26 is rotatably held by the bearing 24 by a bearing retainer 27 attached to the front surface of the lens holding cylinder 26. Inside the lens holding tube 26,
The camera 15 and a lens 15a of the camera 15 are held.

The apparatus main body 12 is provided with a camera rotating means 31 for rotating the camera 15 held by the lens holding tube 26. The camera rotating means 31 has a large-diameter gear 32 fixed to the lens holding cylinder 26, and a driving gear 35 fixed to a driving shaft 34 of a motor 33 is engaged with the gear 32. The motor 33 is fixed in the apparatus main body 12, and the lens holding cylinder is
26 rotates, and the camera 15 rotates forward and backward about the optical axis L.

The apparatus main body 12 is provided with camera rotation detecting means 39 for detecting the rotation of the camera 15. The camera rotation detecting means 39 has an encoder plate 40 attached to the gear 32, and an encoder plate 41 attached to the encoder plate 40, and a sensor facing the rotation region of each of the encoder plates 40, 41. 42 and 43 are provided respectively. The encoder plate 40 is for detecting the rotation angle of the camera 15 and is formed in an annular shape, and a plurality of concave portions 44 and convex portions 45 are formed on the peripheral edge thereof at equal intervals. With the rotation of 40, a pulse signal is output from the sensor 42, and the rotation angle of the camera 15 is detected based on the pulse signal. The encoder plate 41 is for detecting a fixed position of the rotation of the camera 15 and is formed in a protruding piece shape protruding in the outer diameter direction. When the sensor 43 detects the encoder plate 41, the encoder plate 41 The home position is detected. Each sensor
Reference numerals 42 and 43 denote light sensors having a light emitter and a light receiver for projecting and receiving the detection light. The detection light is shielded by the projection 45 of the encoder plate 40 and the encoder plate 41, respectively. Supported by the base 21.

The apparatus main body 12 is provided with rotation restricting means 50 for restricting the rotation range (rotation angle) of the camera 15.
The rotation restricting means 50 is disposed at a position 180 ° opposite to the position of the pin 51 projecting from the outer peripheral surface of the lens holding cylinder 26 and the position of the pin 51 when the camera 15 is at the fixed position. It has a stopper 52 provided. The stopper 52 is attached to the base 21
A pair of stoppers 54 are rotatably supported by a support shaft 55 on the base 53 so as to face the lens holding cylinder 26, and each stopper 54 is attached to the base 53. The stopper body 54 is urged by a spring (not shown) so as to protrude toward the lens holding cylinder 26, and a stopper surface 56 is formed on the opposing surfaces of the stopper body 54. For example, in FIG. 2, when the lens holding cylinder 26 rotates counterclockwise, the pin 51 pushes the one stopper body 54 against the spring and pushes the stopper body 54 against the stopper surface 56 of the other stopper body 54. The rotation is regulated by the contact, and similarly, when the rotation is made in the clockwise direction, the pin 51 pushes the other stopper body 54 against the spring and pushes the other stopper body 54 against the stopper surface 56 of the one stopper body 54. The rotation is regulated by the contact. Therefore,
The rotation range of the lens 15 is 1 in both directions with respect to the home position.
80 ° each.

A code device for electrically connecting the camera 15 to external devices of the apparatus main body 12 is provided at the rear of the apparatus main body 12.
61 is installed. This cord device 61
62, an inner cylinder 63, and an outer cylinder 64.

The cord 62 has a flexibility in which a plurality of electric wires are accommodated in a tubular insulator having an insulating property and has a substantially circular cross section. One end is connected to the camera 15 and the other end is an outer cylinder.
64 is drawn out to the outside and connected to an external device of the apparatus main body 12, and an intermediate portion is spirally wound between the inner cylinder 63 and the outer cylinder 64.

The inner cylinder 63 is formed in a hollow cylindrical shape, and has a front end attached to the lens holding cylinder 26 and rotates integrally. A single spiral spiral guide 65 is attached to the outer peripheral surface of the inner cylinder 63, and the spiral guide 65 defines a single spiral groove 66 in which an intermediate portion of the cord 62 is spirally arranged. At the rear end of the spiral groove 66, a groove 68 is formed in which one end of the cord 62 is supported via a bushing 67.
One end of the cord 62 is inserted through the inside of the inner cylinder 63 and connected to the camera 15. A plurality of ventilation holes 69 for radiating heat from the camera 15 are formed in the inner cylinder 63,
The plurality of ventilation holes 69 are formed in parallel with each other along the axial direction at, for example, four locations in the circumferential direction of the inner cylinder 63.

The outer cylinder 64 is formed in a cylindrical shape having a front face opened and a rear face closed, and a front end is attached to a cover 70 covering the periphery of the apparatus main body 12. An opening for drawing the other end of the cord 62 to the outside at a part of the front end side of the outer cylinder 64
71 is formed and covers the periphery of this opening 71
The cover 72 is provided with a hole 74 for supporting the other end of the cord 62 via a bushing 73, and the cord 62 is drawn out through the hole 74.

The distance L1 (radial width of the spiral groove 66) between the outer peripheral surface of the inner cylinder 63 and the inner peripheral surface of the outer cylinder 64 is larger than the diameter R of the cord 62, for example, about 3 times the diameter R of the cord 62. The spiral pitch (width in the parallel direction of the spiral grooves 66) L2 of the spiral guide 65 is formed to be larger than the diameter R of the cord 62, and the outer peripheral portion of the spiral guide 65 and the outer cylinder 64 are formed. The gap L3 with the inner peripheral surface is formed smaller than the diameter R of the cord 62. Therefore, between the inner cylinder 63 and the outer cylinder 64, the code
A gap is formed so that the helical diameter D (showing the outer diameter) of the helical intermediate portion of 62 can expand and contract with the rotation of the inner cylinder 63.

On the surface of the cord 62, an inner cylinder 63, an outer cylinder
A surface layer having a small coefficient of friction is formed to make it slippery in contact with the screw 64 and the spiral guide 65, and the surface layer is formed of a tape wound around the peripheral surface of the cord 62, a surface treatment, or the like. Is done.

On the outer peripheral surface of the inner cylinder 63, the inner peripheral surface of the outer cylinder 64, and the surface of the spiral guide 65, a surface layer having a small coefficient of friction is formed so as to make it slippery in contact with the cord 62. The surface layer is formed by a surface treatment for coating a material having a low coefficient of friction.

The friction coefficients of the surface layers of the cord 62, the inner cylinder 63, the outer cylinder 64 and the spiral guide 65 are as follows.
It is smaller than the friction coefficient of the surface material of the outer cylinder 64 and the spiral guide 65.

A slit-shaped ventilation hole (not shown) is formed in the rear end surface of the outer cylinder 64, and an exhaust fan for exhausting the air in the outer cylinder 64 from the ventilation hole to the outside inside the rear end surface of the outer cylinder 64. 81 are arranged.

As shown in FIGS. 1 to 3, when the encoder plate 41 for detecting the fixed position is detected by the sensor 43, the camera 15 is positioned at a fixed position with respect to the apparatus main body 12. The inner cylinder 63 of the cord device 61 that rotates integrally with the camera 15 is also at the fixed position. In the fixed state of the cord device 61, the cord 62 arranged in the spiral groove 66 is
Is located approximately in the middle between the outer cylinder 64 and the outer cylinder 64, and the helical diameter at this time is D1.

The driving of the motor 33 causes the camera 15 to rotate via the gears 35 and 32 and the lens holding tube 26,
The encoder plate 40 that rotates together with 26 is detected by the sensor 42, and the rotation angle of the camera 15 is detected. In FIG. 2, when the camera 15 rotates counterclockwise from the home position by about 180 °, the pin 51 pushes the one stopper body 54 against the spring, and the stopper surface 56 of the other stopper body 54 is pressed.
When the camera 15 rotates about 180 ° in the clockwise direction from the home position, the pin 51 pushes the other stopper body 54 against the spring, thereby causing the camera 15 to rotate. The rotation is stopped by abutting the stopper surface of the stopper body 54 of FIG.

The cord device 61 when the camera 15 is rotated about 180 ° in one direction (counterclockwise direction in FIG. 2) from the home position.
4 is shown in FIG. When the inner cylinder 63 rotates in one direction together with the camera 15, one end of the cord 62 rotates together with the inner cylinder 63 to draw the cord 62 to one end, but the other end of the cord 62 passes through the bushing 73. Since it is supported at a fixed position on the side of the apparatus main body 12, the intermediate portion of the cord 62 drawn to one end side is reduced in diameter while moving in the spiral groove 66, and is smaller than the spiral diameter D 1 of the cord 62 at the fixed position. A small spiral diameter D2 results.
Therefore, the cord device 61 can allow the camera 15 to rotate in one direction.

FIG. 5 shows the state of the cord device 61 when the camera 15 is rotated from the home position by about 180 ° in the other direction (clockwise direction in FIG. 2). When the inner cylinder 63 rotates in the other direction together with the camera 15, one end of the cord 62 rotates together with the inner cylinder 63 and pushes the cord 62 back to the other end, but the other end of the cord 62 connects the bushing 73. Since the intermediate portion of the cord 62 pushed back to the other end side expands while moving in the spiral groove 66, the spiral diameter of the cord 62 at the fixed position is supported. The spiral diameter D3 is larger than D1. Therefore, the cord device 61 can allow the camera 15 to rotate in the other direction.

As described above, in the code device 61, the code 62
Even if one end of the cord 62 is on the inner cylinder 63 and the other end is on the outer cylinder 64, the middle part of the cord 62 is spirally arranged in the spiral groove 66 between the outer cylinder 64 and the inner cylinder 63, and The diameter D in the spiral state is a spiral groove
Since it is possible to expand and contract within 66, when the inner cylinder 63 rotates with respect to the outer cylinder 64, the helical intermediate portion of the cord 62 expands and contracts, so that the occurrence of twisting of the cord 62 can be absorbed, and Durability can be improved without applying excessive force, and the inner cylinder against the outer cylinder 64
63 smooth rotation can be tolerated. Therefore, in the X-ray imaging apparatus using the code device 61, a smooth rotation of the camera 15 with respect to the apparatus main body 12 can be allowed.

Further, the surface of the cord 62, the outer surface of the inner cylinder 63,
Since the inner surface of the outer cylinder 64 and the surface of the spiral guide 65 are formed with a surface layer having a small friction coefficient, the cord 62 and the inner cylinder
63, the contact resistance between the outer cylinder 64 and the spiral guide 65 can be reduced, and the spiral intermediate portion of the cord 62 can be smoothly expanded and contracted in the spiral groove 66.

Further, since the inner cylinder 63 is attached to the camera 15 side, hot air generated by the heat of the camera 15 is likely to be trapped in the inner cylinder 63. However, since a plurality of ventilation holes 69 are formed in the inner cylinder 63, Through the vent hole 69, the air permeability inside and outside the inner cylinder 63 is improved, and the retention of hot air in the inner cylinder 63 can be reduced. In addition, the hot air in the inner cylinder 63 can be exhausted to the outside of the outer cylinder 64 by the exhaust fan 81 arranged facing the end face of the inner cylinder 63.

The spiral guide 65 is not limited to the case where the spiral guide 65 is attached to the inner cylinder 63, and may be attached to the outer cylinder 64.
A similar effect can be obtained.

Further, the surface layer is provided only on one of the cord 62, the inner cylinder 63, the outer cylinder 64, and the spiral guide 65, so that the contact resistance is reduced, and the spiral intermediate portion of the cord 62 has a spiral shape. Expansion and contraction in the groove 66 can be performed smoothly.

In addition, by forming not only one spiral groove 66 but also a plurality of spiral grooves 66, a plurality of cords 62 can be handled simultaneously.

Further, the cord device 61 does not have the spiral guide 65, and may simply arrange the intermediate portion of the cord 62 between the inner cylinder 63 and the outer cylinder 64 in a spiral shape. Since the intermediate portion is helically arranged between the inner cylinder 63 and the outer cylinder 64 and its helical diameter can be expanded or contracted, the spiral of the cord 62 when the inner cylinder 63 rotates with respect to the outer cylinder 64. By expanding and contracting the middle part of the shape, the occurrence of kinking of cord 62 can be absorbed,
Excessive force is not applied to 62, durability can be improved, and smooth rotation of the inner cylinder 63 with respect to the outer cylinder 64 can be allowed.

The code device 61 is an X-ray image device.
The present invention is not limited to 11, and can be used for various electric devices that connect the rotating side and the fixed side with a cord 62.

[0041]

According to the cord device of the first aspect, even if one end of the cord is on the inner cylinder and the other end is on the outer cylinder, the middle portion of the cord is spirally formed between the outer cylinder and the inner cylinder. And the helical diameter can be expanded and contracted, so that when the inner cylinder rotates with respect to the outer cylinder, the helical intermediate portion of the cord expands and contracts, so that the occurrence of kinking of the cord can be absorbed. And the durability can be improved, and smooth rotation of the inner cylinder with respect to the outer cylinder can be tolerated.

According to the cord device of the second aspect, even if one end of the cord is located on the inner cylinder and the other end is located on the outer cylinder, the intermediate portion of the cord is located in the spiral groove between the outer cylinder and the inner cylinder. It is helically arranged and its helical diameter can be expanded and contracted in the helical groove, so that when the inner cylinder rotates with respect to the outer cylinder, the helical intermediate part of the cord expands and contracts, and the kinking of the cord is reduced. The generation can be absorbed, the cord can be applied without excessive force, and the durability can be improved.
Smooth rotation of the inner cylinder with respect to the outer cylinder can be allowed.

According to the cord device of the third aspect, in addition to the effect of the cord device of the second aspect, at least one of the inner surface of the outer cylinder, the outer surface of the inner cylinder, the surface of the spiral guide, and the cord. In addition, since the surface layer having a small coefficient of friction is formed, the contact resistance between the outer tube, the inner tube, and the helical guide and the cord can be reduced, and the helical intermediate portion of the cord can be smoothly expanded and contracted.

According to a fourth aspect of the present invention, there is provided the X-ray imaging apparatus according to any one of the first to third aspects, wherein the inner cylinder is mounted on the camera side and the outer cylinder is mounted on the apparatus main body. Can be allowed to rotate smoothly.

[Brief description of the drawings]

FIG. 1 is a bottom view of a part of an X-ray image apparatus, showing an embodiment of a code apparatus and an X-ray image apparatus of the present invention.

FIG. 2 is a side view showing a part of the X-ray imaging apparatus.

FIG. 3 is a front view showing the whole X-ray imaging apparatus.

4A and 4B show the same cord device, wherein FIG. 4A is a bottom view showing a state in which a spiral middle part of the cord is reduced in diameter, and FIG. 4B is a side view showing a state in which the spiral middle part of the cord is reduced in diameter. is there.

5A and 5B show the same cord device, wherein FIG. 5A is a bottom view of a state where a spiral middle part of the cord is expanded, and FIG. 5B is a side view of a state where the spiral middle part of the cord is expanded. is there.

[Explanation of symbols]

 11 X-ray imaging device 12 Main unit 15 Camera 31 Camera rotating means 61 Code device 62 Code 63 Inner tube 64 Outer tube 65 Spiral guide 66 Spiral groove

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Koichiro Niimura 4710 Nakasu, Suwa-shi, Nagano F-term in Chinontec Co., Ltd. (reference) 4E352 AA02 AA06 AA16 BB12 BB17 DD08 DD09 DR02 DR07 DR23 DR24 FF01 FF09 GG20

Claims (4)

[Claims] 1. A rotating inner cylinder, a cord in which an intermediate portion is spirally disposed around the inner cylinder and one end of which is connected, and the other end of the cord is led out, and a periphery of the inner cylinder is provided. An outer cylinder that covers the spiral intermediate portion of the cord, and is provided with a gap that allows the spiral diameter of the spiral intermediate portion of the cord to expand and contract with the rotation of the inner cylinder. A cord device, characterized in that: 2. A rotating inner cylinder, a cord in which an intermediate portion is spirally arranged around the inner cylinder and one end of which is connected, and the other end of the cord is led out to surround the inner cylinder. An outer cylinder that covers the spiral intermediate portion of the cord, and is provided with a gap that allows the spiral diameter of the spiral intermediate portion of the cord to expand and contract with the rotation of the inner cylinder; A spiral guide that is spirally disposed between the inner cylinder and the outer cylinder and that defines a spiral groove in which the spiral intermediate portion of the cord is disposed between the inner cylinder and the outer cylinder. A cord device, characterized in that: 3. A surface layer having a small coefficient of friction is formed on at least one of the inner surface of the outer cylinder, the outer surface of the inner cylinder, the surface of the spiral guide, and the cord. Cord device. 4. An apparatus main body, a camera arranged to be rotatable about the optical axis with respect to the apparatus main body, and taking an X-ray image, and a camera turn for rotating the camera with respect to the apparatus main body. 4. A cord device according to any one of claims 1 to 3, wherein a moving means, an inner cylinder is attached to the camera side, one end of a cord is connected, and an outer cylinder is attached to the apparatus main body side. X-ray imaging apparatus.