JP3870083B2 - Grid attachment / detachment mechanism of radiography equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a grid attaching / detaching mechanism of a radiographic apparatus capable of attaching / detaching a grid used for removing scattered rays.
[0002]
[Prior art]
Conventionally, a radiation imaging apparatus capable of detaching a grid from a radiation imaging apparatus is disclosed in Japanese Patent Application Laid-Open No. 2000-139887.
[0003]
As another example of the radiation imaging apparatus, one that can freely switch the attitude of the imaging apparatus is known. For example, in a so-called C-arm imaging apparatus, an X-ray generation source and an X-ray imaging unit are provided at both ends of the C arm, respectively, and the rotation of the C arm around the support shaft that supports the C arm and the C arm. In accordance with this shape, slide rotation or the like in which the C-arm slides is possible, and the subject can be photographed from various directions and angles by switching the posture of the X-ray photographing unit.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional example, since the operator performs an operation of attaching or detaching the grid to the photographing apparatus, the grid may be dropped in the same manner due to an erroneous operation or carelessness during the operation.
[0005]
In addition, when the grid of the radiation imaging unit attached to the C-arm is made detachable, depending on the posture of the radiation imaging unit, the grid attachment / detachment direction and the gravity direction are substantially the same. There is a risk of dropping the grid due to carelessness during operation.
[0006]
As a result, an impact is applied to the grid and the characteristics of the grid change, and if a picture is taken using the grid with the changed characteristics, the image quality may be deteriorated. Further, in order to avoid a change in characteristics due to impact, the grid needs to have a strong structure.
[0007]
The objective of this invention is providing the grid attachment / detachment mechanism of the radiography apparatus which has the mechanism which solves the above-mentioned subject and prevents the fall of the grid at the time of grid attachment / detachment operation.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the grid attaching / detaching mechanism of the radiation imaging apparatus according to the present invention is a radiation imaging apparatus that allows the grid to be attached / detached, and fixing means for fixing the grid to at least two predetermined positions in the imaging apparatus. Or it has a position control means, The said predetermined position was provided during the attachment or detachment process of the said grid, It is characterized by the above-mentioned.
[0009]
Further, the grid attaching / detaching mechanism of the radiation imaging apparatus according to the present invention includes a fixing means or a position restricting means for fixing the grid to at least two or more predetermined positions in the imaging apparatus in the radiation imaging apparatus that allows the grid to be attached and detached. And a release means for releasing the fixing means or the position restricting means, wherein the predetermined position is provided during the attaching / detaching process of the grid.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail based on the illustrated embodiment.
FIG. 1 is a cross-sectional view as viewed from above the radiation imaging apparatus provided with the grid attaching / detaching mechanism in the first embodiment, and FIG. 2 is a cross-sectional view as viewed from the side. The imaging apparatus 1 is disposed in front of the X-ray generation side of the X-ray generation unit 2, and the subject provided outside is disposed between the imaging apparatus 1 and the X-ray generation unit 2. The photographing apparatus 1 is connected to a control unit including a signal processing unit, a power supply unit, a display unit, and the like (not shown) via a cable. An opening 3 a is provided on one side surface of the housing 3 of the photographing apparatus 1, and a cover 4 for opening and closing the opening 3 a is attached to the housing 3 via a hinge 5.
[0011]
Inside the housing 3, a grid 6 and an X-ray image receiving unit 7 are sequentially arranged from the X-ray generation unit 2 side. The grid 6 is for removing scattered X-rays from the subject, and is disposed on the front surface of the X-ray image receiving unit 7 and is detachably disposed on the housing 3. Furthermore, a handle 8 having a grip portion for facilitating attachment / detachment is attached to the grid 6. Further, a guide member (not shown) for guiding the grid 6 in parallel with the X-ray image receiving unit 7 is provided in the space in which the grid 6 inside the housing 3 is accommodated.
[0012]
Inside the X-ray image receiving unit 7, a radiographic image digital detector 7a and a reading circuit 7b are sequentially arranged from the grid 6 side. The reading circuit 7b is connected to the radiographic image digital detector 7a and photographed images. The signal is output as a digital signal.
[0013]
When the subject is photographed without using the grid 6, the cover 4 is opened, the handle 8 is grasped, the grid 6 is taken out from the housing 3, and the cover 4 is closed to photograph.
[0014]
FIG. 3 is a front view of the grid 6 viewed from the X-ray generation unit 2 side, and FIG. 4 is a plan view. The grid body 11 is fixed to a frame-shaped grid holding part 13 via a fixing member 12. The outer periphery of the grid holding portion 13 has a wall, and both corners on the other surface of the surface to which the handle 8 is attached are tapered. In addition, the first and second fitting holes 14 and 15 are spaced at a distance L from the side close to the handle 8 on the upper surface of the outer peripheral wall of the grid holding portion 13 that is orthogonal to the surface to which the handle 8 is attached. Is formed.
[0015]
FIG. 5 shows a front view of the grid 6 attached to the imaging apparatus 1 as seen from the X-ray generator 2 side. Guide members 21 and 22 for guiding the grid 6 are provided inside the photographing apparatus 1. Further, an L-shaped fixing pin 23 for fixing the grid 6 is provided in the upper right part of the photographing apparatus 1, and the tip of the fixing pin 23 is tapered on the opening 3a side, and is guided by a guide member. It is slidable in the directions of arrows A and B, and is further urged in the direction of position A by urging means (not shown). The fixing pin 23 engages with the first fitting hole 14 provided in the grid holding portion 13 to fix the grid 6 in the first position. When the grid 6 is used, the grid 6 Shooting is performed with the position fixed at position 1.
[0016]
On the other hand, the other end of the fixing pin 23 is exposed to the outside from the housing 3 and serves as a release lever 24. When the release lever 24 is slid in the direction of the arrow, the fixing pin 23 is pushed up to the position B against the urging force of the urging means, and the grid 6 can be released.
[0017]
When the grid 6 is removed from the photographing apparatus 1, the grid 6 is fixed to the first fitting hole 14 by the fixing pin 23 by operating the release lever 24, and when the handle 8 is grasped and pulled rightward, the grid 6 The grid 6 moves in parallel by the guidance of the guide members 21 and 22 arranged so as to sandwich the 6 up and down, and the fixing pin 23 abuts against the outer wall of the grid holding portion 13 and maintains the state at the position B. . Further, when the grid 6 is moved rightward, the fixing pin 23 is engaged with the second fitting hole 15 by the action of the urging means as shown in FIG. 6, and the grid 6 is fixed at the second position. . That is, the grid 6 is temporarily fixed in a state where the grid 6 is pulled out from the photographing apparatus 1 by a substantially distance L. In order to completely remove the grid 6 from the photographing apparatus 1, the release lever 24 is operated again to release the fixation of the grid 6 with respect to the second fitting hole 15, and the grid 6 is completely pulled out.
[0018]
On the contrary, when the grid 6 is inserted into the photographing apparatus 1, when the grid 6 is inserted into the photographing apparatus 1 from the opening 3a, the grid 6 enters the photographing apparatus 1 while being guided by the guide members 21 and 22, The tapered tip provided on the grid holding portion 13 and the tapered tip of the fixed pin 23 come into contact with each other, and the fixed pin 23 biased to the position A is pushed up to the position B. Further, when the grid 6 is inserted, the grid 6 is temporarily fixed at the second position as shown in FIG.
[0019]
Subsequently, when the grid 6 is released by the operation of the release lever 24 and the grid 6 is further inserted, the fixing pin 23 is engaged with the second fitting hole 15 as shown in FIG. The position is fixed at position 1, and photographing using the grid 6 is possible.
[0020]
For example, in a photographing apparatus having a C-arm provided with a grid attaching / detaching mechanism having such a configuration, the posture of the photographing apparatus 1 is substantially the same in the grid attaching / detaching direction and the gravitational direction with the grid 6 fixed at the first position. The grid 6 is switched to the matching direction, and the release of the grid 6 is released by operating the release lever 24. Even if the grid 6 starts to fall from the opening 3a, the grid 6 is fixed again at the second position. Therefore, even if the grid 6 is accidentally forgotten to be held when the release lever 24 is operated, it does not immediately fall to the floor.
[0021]
In addition, with the grid 6 inserted between the first position and the second position, the posture of the photographing apparatus 1 is switched to a direction in which the grid attaching / detaching direction and the gravity direction substantially coincide with each other, and the grid 6 starts to fall. However, since the grid 6 is fixed at the second position, even if the posture of the photographing apparatus is switched by mistake without holding the grid 6, it is not dropped on the floor.
[0022]
7 is a front view of the grid 6 in the second embodiment, FIG. 8 is a plan view, and FIG. 9 is a bottom view. The same members as those in the first embodiment are denoted by the same reference numerals. ing. A fitting hole 14 is provided on the side surface of the grid holding portion 13 at the same position as that of the first embodiment, and a handle is provided on the bottom surface separated by a depth distance L on the opposite side of the first fitting hole 14. A third fitting hole 31 having a tapered side surface on the side of 8 is provided.
[0023]
A fixing release mechanism 32 is provided on the bottom side of the grid holding portion 13 where the fitting hole 31 is provided in order to fix the grid 6 to the second position in the photographing apparatus 1. The fixing release mechanism 32 has a release cam 34 rotatably supported around a shaft 33 provided in the grid holding portion 13 as a rotation center. Further, the release knob 35 is connected to the release cam 34 via a shaft 36, and is slidable in the directions of arrows C and D in the drawing. The release knob 35 is biased toward the position C by the tension spring 37, and the release cam 34 is also rotated clockwise about the shaft 33.
[0024]
In order to allow the release knob 35 to be operated from the outside of the grid 6, the front surface of the grid 6 is opened, or the grid 6 is provided with a window for operating the release knob 35.
[0025]
FIG. 10 shows a front view of the grid 6 attached to the photographing apparatus 1. A fixing pin 41 is provided on the bottom surface side opposite to the fixing pin 23, and the tip end portion thereof is tapered on the opening 3a side, and can be slid in the directions of arrows E and F by a guide member (not shown). And biased in the position E direction by a biasing means (not shown). In a state where the grid 6 is fixed at the first position by the fixing pin 23, the grid 6 is positioned at the position F against the urging force of the urging means (not shown) by contacting the outer wall of the grid holding portion 13. is doing.
[0026]
When the grid 6 is removed from the photographing apparatus 1, the fixing by the fixing pin 23 is released by operating the release lever 24 as in the first embodiment. In the middle of the grid 6 being unfixed and moving in parallel to the right, the fixing pins 23 and 41 are both in contact with the outer wall of the grid holding part 13 and are maintained at positions B and F, respectively. . When the grid 6 is further moved to the right, the grid 6 is temporarily fixed at the second position by engaging the fixing pin 41 with the fitting hole 31 as shown in FIG.
[0027]
In order to completely remove the grid 6 from the photographing apparatus 1, the release knob 35 is slid from the position C to the position D. In conjunction with the sliding movement of the release knob 35, the release cam 34 rotates counterclockwise about the shaft 33, and the tip 34a of the release cam 34 pushes the position of the fixing pin 41 from the position E to the position F. Then, the grid 6 is fixed by the fixing pin 41 and the grid 6 is pulled out.
[0028]
In this case, one hand can grasp the handle 8 and the other hand can hold the grid holding part 13 near the release knob 35 while sliding the release knob 35 with the thumb, and hold the grid 6 with both hands. Therefore, the chance of dropping the grid 6 by mistake can be reduced as compared with the first embodiment.
[0029]
On the contrary, when the grid 6 is inserted into the photographing apparatus 1 from the opening 3a, the grid 6 moves to the left while being guided by the guide members 21 and 22, and is fixed to the tapered portion provided in the grid holding portion 13. The taper portions of the pins 23 and 41 come into contact with each other, and the fixed pins 23 and 41 urged to the positions A and E respectively slide to the positions B and F. When the grid 6 is further inserted, as shown in FIG. 11, the fixing pin 41 engages with the third fitting hole 31, and the grid 6 is temporarily fixed at the second position of the housing 1.
[0030]
When the grid 6 fixed at the second position is further inserted into the photographing apparatus 1, the taper portion of the fixing pin 41 and the taper portion of the third fitting hole 31 come into contact with each other, and the fixed portion biased to the position E is fixed. The pin 41 is pushed down to the position F. In other words, in the second position, the grid 6 is not restricted in movement in the mounting direction, and is restricted in movement only in the direction in which the grid 6 is removed, and is in a position-restricted state. When the grid 6 is further inserted, it is not necessary to operate the release knob 35 and the operation is easy. When the grid 6 is further inserted, the fixing pin 23 is engaged with the first fitting hole 14 of the grid 6 as shown in FIG. 10, and the grid 6 is fixed at the first position.
[0031]
In the grid attaching / detaching mechanism having such a configuration, fixing means and releasing means for fixing the grid 6 to the first position and the second position are provided at different positions. In addition, since the second releasing means for releasing the fixation of the grid 6 fixed at the second position substantially acts only when the second fixing means is fixed, the grid 6 is more reliably secured in the second position. It becomes possible to fix to.
[0032]
The form of the fixing means and the releasing means of the grid 6 described above are not limited to the first and second embodiments, and other modifications may be used as long as they do not depart from the object of the present invention. Absent. For example, three or more fixing means and releasing means may be provided in the process of attaching and detaching the grid 6, and all operating portions of the releasing means such as the releasing lever 24 may be provided on the grid 6 side. Further, although the radiation image digital detector 7a is used as the X-ray image receiving unit 7, the same effect can be achieved even when a cassette containing a radiographic film or a storage phosphor sheet is used.
[0033]
【The invention's effect】
As described above, the grid attaching / detaching mechanism of the radiographic apparatus according to the present invention can prevent or reduce the dropping of the grid due to an erroneous operation during the grid attaching / detaching operation or carelessness during the operation. Furthermore, it is possible to prevent or reduce the deterioration of the grid characteristics due to the drop and the deterioration of the photographed image quality.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a radiation imaging apparatus as viewed from above.
FIG. 2 is a cross-sectional view seen from the side.
FIG. 3 is a front view of a grid.
FIG. 4 is a plan view of a grid.
FIG. 5 is a front view of a grid attached to the radiation imaging apparatus.
FIG. 6 is a front view of a grid attached to the radiation imaging apparatus.
FIG. 7 is a front view of a grid.
FIG. 8 is a plan view of a grid.
FIG. 9 is a bottom view of the grid.
FIG. 10 is a front view of a grid attached to the radiation imaging apparatus.
FIG. 11 is a front view of a grid attached to the radiation imaging apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Radiographic apparatus 2 X-ray generation part 3 Case 3a Opening part 6 Grid 8 Handle 11 Grid main body 12 Fixing member 13 Grid holding | maintenance part 14,15,31 Fitting hole 21,22 Guide member 23,41 Fixing pin 24 Release lever 32 Release mechanism 33, 36 Shaft 34 Release cam 35 Release knob 37 Tension spring

Claims (6)

In the radiographic apparatus capable of attaching and detaching the grid, the radiographic apparatus includes fixing means or position restricting means for fixing the grid to at least two or more predetermined positions in the imaging apparatus, and the predetermined position is provided during the process of attaching and detaching the grid. A grid attachment / detachment mechanism for a radiation imaging apparatus. In the radiation imaging apparatus in which the grid is detachable, a fixing means or a position regulating means for fixing the grid to at least two or more predetermined positions in the imaging apparatus, and a releasing means for releasing the fixing means or the position regulating means. A grid attaching / detaching mechanism for a radiation imaging apparatus, wherein the predetermined position is provided during an attaching / detaching process of the grid. The grid attaching / detaching mechanism of the radiation imaging apparatus according to claim 2, wherein at least two releasing means are provided, and the releasing means are arranged at different positions. During stationary or position regulating action of the last fastening means or position regulating means in the removal stroke of the grid, grid removable radiation imaging apparatus according to claim 2, wherein the releasing means is characterized by being adapted to operate mechanism. The radiographic imaging according to claim 2, wherein a release unit that releases at least a final fixing unit or a position regulating unit during the removal process of the grid is provided in the grid among the fixing unit or the position regulating unit. Equipment grid attachment / detachment mechanism. The grid attachment / detachment mechanism of the radiation imaging apparatus according to claim 1, wherein one of the predetermined positions is a position of the grid at the time of imaging.

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