JPH0243367Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is based on the invention, for example, in a twin-focus type X-ray apparatus, before setting the field of view using the ray cones from each focal point, a mirror is moved from a standby position to each beam cone. The present invention relates to a swing switching control device for each mirror in a case where two mirrors are provided so that the field of view irradiated by visible light can be predicted by positioning the mirrors.

When two mirrors are used and only one of them is selected for activation, the aperture field of each mirror overlaps, so if the two mirrors are inadvertently set to the activated position, the mirrors may become damaged due to a malfunction. In many cases, the mirrors collided with each other, damaging the mirror itself or the operating mechanism.

In view of this, the present invention uses a simple mechanism in a device that uses two mirrors to control the swing switching so that when one mirror is in use, the other mirror is always in standby. A pair of operating rotation shafts 3 and 4 to which mirrors 1 and 2 are fixed are arranged parallel to each other, and the other end of a connecting link 5 eccentrically attached to one shaft 3 is connected to both shafts. It is characterized in that the mirrors 1 and 2 are connected eccentrically to the other shaft 4 with an angular play that corresponds to the amount of rocking of the mirrors 1 and 2.

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

The illustrated example shows a case where two mirrors 1 and 2 are used in a twin-focus type X-ray apparatus. are rotated by the knobs 6 and 7, respectively, and the standby position is set so that both the mirrors 1 and 2 are opened outwardly opposite to each other as shown in the second figure. Irradiation from each focal point AB is performed with the operating position in which the irradiation beams from X-ray focal points A and B are moved out of the cone and each mirror 1 and 2 is swung inward as shown by the phantom lines in Fig. 1. Although not shown, the standby position and the operating position of each mirror 1, 2 are regulated by a stopper.

Disks 8 and 9 are fixed to both rotating shafts 3 and 4, respectively, one end of a connecting link 5 is pivotally attached to one disc 8 at an eccentric position 10, and a pin 11 at the other end of the link 5 is attached to the other end of the link 5. They were connected by engaging with an arcuate hole 12 provided in the disc 9 of the. The length of the arcuate hole 12 is set to correspond to the swing angle of the mirrors 1 and 2 from the standby position to the operating position. It is connected to the shaft 4 with an angular play corresponding to the amount of rocking of the mirror.

In the figure, reference numerals 13 and 14 indicate light sources for irradiating visible light provided corresponding to the respective mirrors 1 and 2.

The operating state of the device of the present invention will now be explained.

In the normal state, both mirrors 1 and 2 are in a standby position in which they are withdrawn outward from the cone of radiation from the focal points A and B, as shown by solid lines in FIG. In this state, mirror 1,
2 can be swung to the operating position shown by the dotted lines, regardless of which one is selected. That is, knob 6
By rotating shaft 3 counterclockwise, mirror 1
The pin 11 at the other end of the connecting link 5 only moves counterclockwise in the arcuate hole 12, and the rotation is not transmitted to the shaft 4. Therefore, the mirror 2 Remain still. Matatamami 7
When the mirror 2 is swung to the operating position by clockwise rotation of the shaft 4, the arcuate hole 12 of the disc 9, which rotates together with the shaft 4, moves freely relative to the pin 12 of the connecting link 5. The other mirror 1 therefore remains stationary.

Next, as shown in FIG. 3, when the mirror 2 is in the operating position and the mirror 1 is to be swung to the operating position in the direction of the arrow, the connecting link 5 moves to the left as the disc 8 rotates. Due to the movement, the pin 11 rotates the disk 9 counterclockwise, so the shaft 4 rotates in the same direction, and therefore, as the mirror 1 swings counterclockwise, the mirror 2 rotates.
The mirror 1 is placed in the operating position while being rotated in the same direction and swung away from the operating position toward the standby position. When the other mirror 2 is to be swung toward the operating position, the pin 11 is pushed by the movement of the arcuate hole 12 in the disc 9 as the shaft 4 rotates, and the link 5 is moved. Since the shaft 3 is rotated clockwise via the shaft 8, the mirror 1 is swung from the operating position to the standby position, and the mirror 2 is swung to the operating position.

5 to 7 show the operation mode of another embodiment. In this case, the shaft 3 of the mirror 2 and the disk 9 are rotatably fitted loosely and are connected to each other through an arc-shaped recessed hole. 12' and the protrusion 12'', and both ends 10 and 11 of the connecting link 5 were both pivoted to the disks 8 and 9.The length of the arc-shaped recessed hole 12' was set to
It was made into an arc shape with a length corresponding to the swing angle of 2.

In this embodiment, when both mirrors 1 and 2 are in the standby position as shown in the fifth figure, one of the mirrors can be selected and freely swung to the operating position regardless of the other mirror. As shown in the figure, when the mirror 2 is in the operating position and the mirror 1 is to be swung to the operating position, the protrusion 12'' is pushed by the concave hole 12' of the disc 9 rotated by the link 5. When the mirror 1 is swung to the standby position and the mirror 1 is put into the operating state, and when the mirror 1 is in the operating position and the mirror 2 is put into the operating state as shown in FIG. The disc 9 is rotated through the concave hole 12', and the disc 8 on the other side is then rotated through the connecting link 5, so that the mirror 1 is in the operating position.
While the mirror 2 is swung toward the standby position, the mirror 2 is placed in the operating position.

Incidentally, visible light is irradiated onto the mirror stopped at the operating position through the respective optical gaps 13 and 14, and the irradiated field of view is confirmed by the reflected light from the mirror.

In this way, according to the present invention, when the two mirrors 1 and 2 are both in the standby position, one of the mirrors can be freely swung or returned to the operating position regardless of the other, and When either mirror is in the operating position and the other mirror is swung to the operating position, the mirror in the operating position is automatically returned to the standby position, so even if there is a malfunction, both mirrors 1 and 2 will be activated. Therefore, it is possible to prevent damage caused by collision between the two mirrors and failure of the operating mechanism, and the structure is extremely simple and has the effect of accurately operating.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the present invention, Figs. 2 to 4 are diagrams showing the operation of the above embodiment, and Fig. 5 is a perspective view showing an embodiment of the present invention.
7 to 7 are diagrams showing operations in other embodiments. 1, 2...Mirror, 3, 4...Operation rotation axis, 5...Connection link.

Claims (1)

[Scope of utility model registration request] Operation rotation shafts 3 and 4 to which mirrors 1 and 2 are fixed, respectively
A pair of connecting links 5 are arranged in parallel, and the other end of the connecting link 5, which is eccentrically attached to one shaft 3, is connected to both mirrors 1,
A rocking switching control device for two mirrors connected eccentrically to the other shaft 4 with an angular play that corresponds to the rocking amount of the second mirror.