JPS59699A - Movable draw device in twin focus x-ray tube device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a twin-focus type X-ray device, that is, one or more focal points are provided at a predetermined interval, and X-rays are emitted alternately from these two focal positions. This relates to a diaphragm device that can be used in common for each radiation from the image point position when performing so-called stereo imaging as well as enlarged imaging, and is a well-known line diaphragm device with a set of four lenses for the conventional single focus X11M tube device. The two sets of upper and lower limiting blades can be used in common for the diaphragm operation of two twin-focus type radiation beams with the same handling as before, simplifying the diaphragm device in this type of device and simplifying the handling and operation. This is a twin-focus type X-ray tube device that alternately emits X-rays to the subject from two focal positions, first and second, which are spaced apart from each other. , four left, right, upper and lower beam limiting blades made of lead or other X-ray attenuating material are used to block the left, right, upper and lower sides of the effective beam from each focal position to obtain a rectangular irradiation field of the desired size. A pair of upper blades and lower blades are provided with an interval in the xm irradiation direction, and left and right limiting blades of the lower blade are composed of a main blade and a sub blade overlapped with the main blade so as to be movable in the diaphragm operation direction, The left and right limiting blades on both sides of the lower blade are respectively linked to the aperture opening and closing operations of the left and right limiting blades on the same side of the upper blade, and are moved at a small ratio to the amount of aperture movement of the left and right restricting blades of the upper blade,
The left and right limiting blades of the upper blade and the lower blade, which are placed on standby outside the radiation on the idle side, are moved toward the first radiation as a restricting action for the radiation on the use side, and the inner ends of the left and right restriction blades of the upper blade are moved toward the first radiation. When the edge reaches the outside position of the first radiation, an actuation mechanism that detects this and starts moves the sub blade that overlaps with the main blade of the left and right limiting blades of the lower blade to protrude and move the inner end edge to the first radiation position. The present invention is characterized in that the left and right limiting blades on both sides of the upper blade and the lower blade are positioned outside the radiation and set at the diaphragm operating position of the maximum irradiation field for the first radiation.

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

In Fig. 1, A%B is the focal position of the xm tube arranged at a predetermined interval, each position has one or more focal points, and the focus points are alternately moved from each focal point toward the subject. The conical radiation Nap b is irradiated, and both radiation IAa,
The object is observed three-dimensionally using a film that has been enlarged and photographed by the alternating irradiation of b, and therefore the radiation from the image point position forms radiation fields at angles that intersect with each other.

For both of these radiation Ma% b, four blades are placed at these outside standby positions to restrict the left and right and top and bottom sides of the wire.
Two sets of diaphragm devices, an upper blade and a lower blade, were provided.

That is, in FIG. 1, (1111+ is the left and right limiting blade in the upper blade, (4) (4) is the vertical limiting blade, and (
2) (2) is the left and right limiting blade in the lower blade, (Fl (
53 indicates an upper and lower restriction blade.

The left and right limiting blades 12J and 121 of the lower blade are provided by superimposing secondary blades +31 and +31 so as to move in the diaphragm operation direction with respect to the main blade. Use a lead plate or other Xi damping material of appropriate thickness.

In addition, the upper blade is placed on the line that includes the point where the outer line of each - side of both number rays &S1) intersects the center line of the other ray, and the lower blade is placed on the first point where both number rays aXb intersect with each other. Provided on the line that includes the position.

As a left and right set of upper and lower blades arranged as above, the left and right restriction blades +21 (2) of the lower blade are moved in conjunction with the aperture opening and closing operations of the left and right restriction blades +11+11 of the upper blade. The left and right limiting blades 121 + 21 of the lower blade are moved at a smaller ratio than the amount of movement of the blade (11(1)).

In addition, the left and right limiting blades (11 (11) of the upper blade are bent in the middle, and when they move outward, the outer plate (11)
a) (1a) was bent inward and folded into the small turret.

If the radiation a is emitted from the first focal position A located on the left side in FIG. 1, and the radiation mb from the other focal position B is stopped, the first radiation lIj! In order to set the irradiation field by a, it is necessary to move the left and right limiting blades tlH2) of the upper and lower blades on one side located outside the second radiation IIAb inward, and perform a diaphragm action to restrict the left and right of these radiation a. Therefore, the left and right limiting blades (1) of the upper blades are moved inward, and the inner edges of the upper blades are moved to the second radiation II as shown in the same figure (11).
When reaching the center line of Mb and the outside of the first radiation Na, the inner edge of the main blade (2) of the left and right limiting blades of the lower blade that is linked to this moves proportionally as shown in the same figure (2I). is located at the center line of the second ray #, but at this position the first ray #
The ripple operation of ila is impossible, and therefore, as described above, the left and right limiting blades (1) of the upper blades are moved to the first radiation fi1i!
By means of an operating mechanism activated by a signal that detects this when reaching the outside of point a, the auxiliary blade (3) overlaps the main blade (2) of the left and right limiting blades of the lower blade, as shown by (5I) in Figure 1. It is moved inward to position its inner edge outside the first radiation Jia. Therefore, the upper and lower left and right limiting blades on one side (1
1 (21131 is ('t) (2 violet) (St
) position and move to the center line of the first radiation a to perform the aperture operation. In this case, the main blade ( 2
) and the auxiliary blade (3) move together in a flat state, and each blade performs an aperture operation up to the center line of the first radiation a, as shown by (1g), (2g), and (31), respectively.

To restore one side of the blade (11t21 (31) to its original position from the above-mentioned ripple operation, the above-mentioned opposite operation is performed, and the upper blade (1) is moved to the outer position of the first radiation fi1m (flit (
1t), the inner edge of the sub-wing (3) of the lower blade also returned to the outer position of the first radiation l1lila @ (5 鳳), and when it moved further from this position, this was detected. The secondary blade (3) is activated by the reverse operation of the starting operating mechanism.
It is superimposed on the vane (2) and thereafter returns to its original position in a superposed state in conjunction with the return movement of the vane (1). The aperture operation of the left and right limiting blades on the right side in the 11iJ has been described above, but it goes without saying that the aperture operation of the left side blades is performed in the same way.

In addition, the upper and lower restriction blades 141 in the upper and lower blades
(51 (41) The throttling operation of 51 can be performed individually by a conventionally known appropriate means, or by the two sets 4 described above.

In Figure 1, 0Q is the X-ray tube, 0υ is the housing with a built-in marking device that attaches to the front surface of the tube 0 track, @ is each focal point position A
Two truncated pyramid-shaped shielding cylinders are installed on the rear surface of the housing Uυ facing the SB.廿ji Mm board, which corresponds to the conventional cross-ruled board attached to the front of the aperture device housing aυ, 0ω is a visible light lamp, (161Q7
) is a mirror, and when setting each irradiation field of the first and second radiation gas b by the curving operation by the limiting blade, two sets of left and right are used to predict the size and position etc. of the field using visible light in advance. The first mirror ON is provided so that it can be tilted so that one of the mirrors can be positioned within the irradiation field from the standby position at any time.
When not in use, it is located outside of the radiation range to reduce the inherent radiation of X-rays.

Next, an embodiment of the inventive operating mechanism will be described with reference to FIGS. 2 to 8.

Figure 2 shows the left and right restrictions on the upper and lower blades.Hang the operating shaft (A) with an operating M aIl (211) on the 1% terminal, and hang the endless chaino c161 @ (C) (2) on the shaft (
On the 2) side, the limiting blade (
1) was installed and the shaft was installed. Therefore, if the operation shaft (211 circles) is rotated in the direction of the arrow, the blades (1) and (1) will each face inward izC, that is, in the aperture operating direction, and the fixed guide rod 0ol
It moves guided by cto, and each operating wheel (21+(2υ
If you rotate it in the opposite direction, it will return to its original direction and the blade (11
(Limit the left and right sides of the radiation pancreas by 11.

, each small rotation width c3ω (binion value) was provided coaxially with the pinion, and a rack piece c3η0η was engaged with each small rotation width c3ω.

The main blades (2) (2) of the left and right limiting blades of the frame piece-8IOVc lower blade were attached so as to move in the same direction as the movement of the recording blade (11 (1)). It performs aperture operation in the same direction in synchronization with the blades (1) and (1) on the same side of the upper blade, and the rotation ratio of the small wheel oa C32oω0ω, Bi=A value) of this lifting system is Since the ratio is 2:1, as described above, the left and right limiting blades of the upper blade (main blade of the lower blade +21 +2 with respect to IHII) move at a predetermined small ratio.

A rack piece (41) that moves in the direction is provided, and a frame (2
), and the sub-wing (3) was attached to this.

The frame pieces (38 cm) moving in the aperture direction were brought into contact with and separated from each switch at the front position to open and close each switch.

In Figure 1, for example, when radiating xi from the B focal point position, when performing aperture operation to set the irradiation field of the radiation &lb, rotate the operating wheel (2υ in the direction of the arrow and turn the upper blade (11). Move in the direction of the arrow, and when the inner edge reaches the outside of the ray, the main blade on the same side of the lower blade (
2) is linked to this and moves at a ratio of 2:1, so the inner edge of the main blade (2) is moved in the direction of the arrow in Figure 3 until it reaches the center line position of the resting radiation a. The auxiliary blade (3) is made to protrude inward in the aperture operating direction from the overlapping state with the main blade (2), and its inner edge is advanced to the outer position of the radiation sb, thus making the upper blade +1) and the lower blade The main blade (2) and the sub blade (3) are ready to throttle the radiation ib, and 1
At this time, the limit switch (46) is opened by means of the rack piece (4()) and the motor is operated to freely set the size and position of the irradiation field in the radiation tray.

By rotating the operating wheel Qυ in the opposite direction, it moves back to the outer position of the blade line. When the inner edge of the main blade reaches the center line position of the line a, the frame piece (2) switches. As a result, the motor (41) is driven in the reverse direction, rotates, and stops with the secondary blade (3) twisted together with the main blade (lower blade + 2).
When moving the rack piece C3H, the end opposite to the rack piece C3H was supported by the fixed receiving groove piece 01 to stably guide it, but since the first sub-wing +31 +31 is relatively short and lightweight, it is cantilevered. Although it is movable, if necessary, the main blade +23 (a fixed receiving groove piece can be used like 21).

Although the aperture operation described above is performed manually, the operation mechanism is not limited to manual operation, but other functional means such as a motor or the like may be used.

FIG. 4 shows the upper and lower blades in this device. Generally speaking, the upper and lower diaphragm operations of the radiation are set to the upper and lower diaphragm blades on one side, +41 and +5), respectively. In other words, two mutually parallel shafts are mounted with an interval between them, and a shaft piece 521 having one operating wheel 6υ is provided in close proximity to and parallel to the writing shaft, and on the shaft piece 153. wheel 63) and shaft ←1
The rotating wheel 6a fixed on the top is connected with a chain 65), and the shaft is rotated in the same direction vCffl by rotating the operating wheel 6υ in the direction of the arrow.
2), and lock the operating G (gear 67) on the shaft with the gear 6 on the 6 strips 511, and rotate the shaft wheel by rotating the operating wheel 6i) in the direction of the arrow. Rotating in the opposite direction, the upper and lower limiting blades +41 +4) of the upper blade are connected to each shaft 15104 separately, so that they mutually move in the direction indicated by the arrow of the aperture operation. , and on each shaft m) are engaged, and the upper and lower side root blades of the lower blade VC (4H41 and the same side blades of the lower blade VC) are moved in a diaphragm setting to operate the diaphragm. I do.

The above is a mechanism for moving the upper radiation limiting blade +4115) and the lower part, but as shown in the same figure, by connecting the operating wheel 5+1 to the wheel ←η fixed to the shaft - by the chino 161. (The rotation of either of 511 can simultaneously rotate the shaft gQ or If the wheel is allowed to freely rotate, the synchronized interlocking type of the four blades described above can be changed to the above-mentioned blade 2.
It is convenient to be able to convert a set of sheets into different operating formats.

The guide fixed groove piece at the end is shown.

Next, FIG. 5 shows the reversing mechanism of the mirror αD. In order to target twin-focus type X-ray equipment, two sets of light sources (151 and mirror devices, left and right) are provided, but when not in use, they are placed in standby at a position unrelated to radiation, and are faced to the xlvIil, thereby increasing the inherent filtration rate. When in use, the left and right movable mirrors an are selectively tilted into the irradiation field according to the use of the eleventh and second radiations, and the irradiation field is set using visible light in cooperation with the aperture device.

The mirror (1'/I is the rotation of the operating axis υ by the grip piece 6'r VC. The operating axis VC is tilted from the standby position shown by the solid line to the operating position shown by the temporary line by TMJ operation, but there are two circles on the operating axis συ. Board σ”
Cl4J is fixed and each peripheral VC recessed notch (75) (7
6) are provided with their positions changed, and when the mirror α7) is in the inactive standby position, the recess 65) of the disc σ is connected to the switch 6'0.
The operating piece (1) engages with the switch ση to open the electric circuit, and the sharpening disk σ tilts the mirror Q7 to the operating position.
The concave notch σ0 of the switch 081 engages with the actuating piece of the switch 081 to open the electric circuit through the switch 081, and therefore the switch (7
Since ησ~ open and close each other, during use of mirror 07),
The non-operating state can be indicated by a flashing lamp.The operation part of each switch has a concave hole σ5) (When engaged with 7e, it becomes a stopper to prevent the disc from moving.

In the drawing, the glue is applied to one disc (73) or both discs, and the fc spring is activated to create a concave notch (75) (7G) in both discs.
(and switch 177) (The locking state of the actuating piece σ1 stage of 7al is ensured to prevent the disk from stopping in an unstable position. In addition, the switch 0 opens the electric circuit when the mirror αD is in the inoperative position.
7) intervened in the electric circuit of the light source lamp (15J) to prevent the lamp from being turned on when the mirror was inactive.

Figure 6 shows the operating mechanism of the opening/closing shutters o, i (13) for the truncated pyramid-shaped shielding cylinder 0202, in which each shutter a3ti is engaged with the tip of a lever branch activated by the excitation of the rotary solenoid QG. Shutoff cylinder Q2
When the rotary solenoid's base opening is closed and the rotary solenoid's electrical circuit is opened, the rotary solenoid's return spring (not shown) causes it to return and open. The other shielding tube (121) was closed to prevent the scattered radiation from entering the irradiation field through the shielding tube.In addition, the rotary solenoid @4 is selectively activated in synchronization with the X-ray emission operation button. Either one of them is energized and excited.

Furthermore, Figures 7 and 8 show a heat dissipation cooling device for a visible light source lamp (+51), and a halogen lamp is usually used as the light source lamp (1 to 1). Because of this, it is desirable to dissipate this heat outside of the diaphragm, but as mentioned above, there are many different parts converging as part of the diaphragm mechanism inside the diaphragm housing. Therefore, the space required to provide the heat dissipation equipment for the above purpose is limited.

To deal with this, a wind conduit with an axial blower hn installed in the middle was installed in each compartment (C) with both open ends extending across the left and right compartments (C) each equipped with a lamp α. They were attached to the ventilation holes (c) in a removable manner.

The trickle blower Ql power is directly connected to the small motor compass and installed inside the end of the tube, and there are two wind pipes on the left and right (86a) (B6
b) It is formed by dividing it into two parts and inserting it into both ends of the barrel, and by adjusting the degree of insertion, the left and right divisions II! The connection is made sure and easy according to the interval between the ventilation holes of the fi room. The axial flow blower Q17) blows air in one direction as shown by the arrow, so the younger brother 8
In the figure, if the right lamp ae is lit, the cabinet OD
The outside air introduced from the ventilation hole provided on the side wall of The outside air introduced from the right side ventilation hole ψυ cools the right lamp (151) and the left lamp (151).
In the case of lighting heat generation, the external cold air introduced from the right side ventilation hole 611) is injected into the left compartment (into) through the air pipe (86), and the lamp a51 is cooled by the cold air, and the heat is transferred to the left side. It is discharged to the outside from the pores 0υ, and the harmful effects caused by the heat generated by the lamp can be eliminated by using air cooling equipment that has a small volume.

According to the present invention, two sets of diaphragm mechanisms, the upper blade and the lower blade, each consisting of four left, right, upper, and lower line width limiting blades of the same type as the conventional single-focal type X-ray tube device, are adopted. The left and right limiting blades in the blade are composed of two blades, a main blade and a sub-blade, and the sub-blade is pulled out from the main blade at the appropriate time. It can be used in common for different aperture operations for each type of radiation, and therefore, the desired purpose can be achieved with a simple configuration as an aperture device in a twin focus X-ray tube device, and the handling operation is simple and easy. Do it.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and Figure 1 is a front view S2F1 showing the basic main parts of the present invention. J is a perspective view showing the operating mechanism of the left and right limiting blades. 1. FIG. 5 is a detailed perspective view of a part of FIG. 2. 1. FIG.
Fig. 5 is a perspective view of the mirror reversing mechanism, Fig. 6 is a perspective view of the opening/closing shutter operating mechanism, Fig. 7 is a front view of the lamp air cooling mechanism, and Fig. 8 is a plan view thereof. be. A, B...focal position fl! -% aSb...Upper/lower limit blade for radiation 1, 15) (51...Upper/lower @ limit blade of lower blade, (41) (4m)...Sub blade operating mechanism (small motor) Patent holder Obayashi Seisakusho Co., Ltd. Manager: Kin Kitamura - 2 other people

Claims (1)

[Claims] In a twin-focus type X-ray tube device that alternately emits X-rays to the subject from two focal positions, first and second, which are spaced apart, the radiation effect from each focal position is An upper blade made of four left, right, top and bottom beam limiting blades made of lead or other X#il damping material to obtain a rectangular irradiation field of the desired size by blocking the left, right and top of the line. and the lower blades are placed at a distance of 3° in the X-ray irradiation direction,
The left and right restriction blades of the lower blade are composed of a main blade and a sub blade that overlaps with the main blade so that they can move forward and backward in the diaphragm operation direction, and the left and right restriction blades on both sides of the lower blade are similar to the left and right restriction blades on the same side of the husband's upper blade. In conjunction with the opening and closing of the aperture, the left and right limiting blades of the upper blade are moved at a small ratio to the movement of the aperture 1, and the left and right limiting blades of the upper and lower blades are used, which are located on standby outside the radiation on the rest side. The actuating mechanism moves the radiation toward the first radiation as a restricting action of the side radiation, and detects and activates when the inner edge of the left and right limiting blades of the upper blade reaches a position outside the first radiation. The auxiliary blades that overlap the main blades of the left and right limiting blades of the lower blade are moved to protrude so that their inner edges are located outside the first radiation, and the left and right limiting blades on both sides of the lower blade are controlled as well as the upper blade. A movable aperture device in a twin focus X-ray tube device, characterized in that the aperture device is set at an aperture operating position of a maximum irradiation field for a first radiation.