US1471081A - Vibrating buckey diaphragm for scattered X-ray radiation - Google Patents

Description

H. F. WAITE VIBRATING BUCKEY DIAPHRAGM FOR SCATTERED X-RAY RADIATION Filed Sept. 28 1921 INVENTOR Q goRNEY l Patented Get. 16, 1923.

HARRY r. wma, or NEW Yoan, N. fr.

'.VIBItTIhTG BUCKEY DI-APHRAGM FOR SCTTERED X-RAY RADIATION;

Application led September 28, 1921. Serial No. 503,947.

To all whom t 'may concern."

lBe it known that ll, HARRY F. WAITE, a citizen of the United States, and a resident of the city of New York, county of Queens, and State of New York, have invented a new and useful Improvement in Vibrating Buckey Diaphragms for Scattered X-Ray Radiation, of which the following is a specication. The object of m invention is to nullify the eifect of secon ary radiations and stray rays so thatv when a radiograph is made with the use of my device it will be clear and sharply defined and free from all blurring. This and other objects are accomplished by my" invention, one embodiment of which is hereafter more particularly set forth.

For a more detailed description of my invention, reference is to be had to the accompanying drawings, forming a part hereof, in which Figure .1 is a diagrammatic and-perspecf tive view of my device.

Figure 2 is-"a longitudinal section of the same with the wiringomitted, and

Figure 3 is a transverse section taken on the line 3-3 of VFigure 2, looking vin the direction of the arrows.

' Throughout the various views of the drawings, similar reference characters designate similar parts.

My improved diaphragm 1 is provided with rollers or other suitable devices 2 which run -on rails 3, which rails have inwardly extending flanges 4to receive and support a cassette 5 in which is mounted a` sensitive medium, as a plate or a film which is adapted to receive the X-rays in the conventional manner, which rays are generated by any suitable generator as a hot cathode tube 6 which is supplied with three lead in wires 7, 8 and 9 respectively. The wires 7 and -8 run .to the secondary 10 of a step up transformer' 11 and the primary 12 of this transformer is l 15 which is a;

connected in the conventional manner with a suitable source .of energy lthrough wires 13 land le, this latter wire running to a wire if to an alternating generator, not shown, or any other i supply, and-the wire 13 runs to a c is connected to a brush 17 that runs on the rotatin switch 18 which is so arranged and dispo that twice in each revolution the brush 17 will be on a contact 19 of the switch and when so on the eontact will be connected to a second brush 20 at current source o the end of a wire 21 which runs to the same source of supply as does the wire 15. rlhe switch 18 is provided with a crank pin 22 and a link 23 which is connected to the diaphragm 1 so that this diaphragm will reciprocate and the parts are so arranged and disposed that the diaphra m will reciprocate while the brushes 17 an 20 arev connected through the contacts 19 and not-otherwise. The switch 18 is preferably placed at the upper end of the armature shaft 24 of the motor 25 which has its leads in wires 26 and 27 connected to the wires 15 and 21, las shown.

The wires 8 and9 which supply the current for heating the hot cathode run to the secondary 28 of the'step down transformer 29 which las its primary 30 connected by wires 31 and 32 to the wires 26 and 27,

parent that the transformer 11 will be energized onl when the brushes 17 and 20 are electrical y connected and the transformer 29 will be energized at all times when the apparatus is in use so that the cathode will not'cool in the tube 6. l.

The switch 18, the motor 25 and the diaphragm 1y and their connected parts are pref erably concealed beneathV the protecting cover 33 and between the depending sides 34. `The top 33 .may carry a body 35 through which the radiograph is taken, and this body may contain a part 36 which will set up secondary radiations. These secondary radiations will blur the radiographand make the same diilcult to read or may seriously fog the same. To overcome this difficulty, in addition to making the diaphragm l reciprocate, it is made in a peculiar manner which will now be described. Assuming that thel tube 6 has an anode or target 37 which generates X-rays which pass from the tube 6 along radial lines and thereby'cause secondary rays from a part 36, it is apparent that these secondary radiations Iwill be propagated in radial lines from' the object 36 and not from the target 37. Now

the diaphragm 1 is made up of wood and to the secondary X-rays which are generated from the part 36, only a few of which will get by the strips 39 and throughV the strips 38 so that the fogging or injury to the radiograph will be a minimum. If the screen l were fixed in position, the radiograph would be objectionable because it would have lines running across the same. This difficulty is overcome by causing the diaphragm l to reciprocate rapidly under the influence of the motor 254 by which it is driven through the switch 18 and link 23. As this'movement is short the strips 38 will offer a very limited interference with the X-rays generated by the' target 37.

It `will be observed that the table r top 3 3 is flat so that the object 35 can rest thereon easily and comfortably. It will also be noted that the diaphragm l is fiat and so is the cassette 5 so that all parts may be used in the conventional manner with the results above noted and no change is required in the cassette or the radiograph.

In -view of the foregoing, the operation of my improved diaphragm will be readily understood, assuming that the cassette with its plate or film is in position, as indicated, and that X-rays are generated in the conventional manner. This being the case the motor will run continuously and .drive the switch 18 with a constant rotary motion, and the diaphragm l will reciprocate to correspond. While it reciprocate-,s X-rays will be generated through a limited part of its movement and not while it is at rest SG that the person making the radiograph need give the diaphragm no considerationvwhat' soever as it automatically acts as it should act so as to screen the radiograph and eliminate the undesirable secondary radiations and yet not mar the radiograph with lines due to the metal laminae 39.

While I have shown and described one embodiment of my invention, it is obvious that it is not restricted thereto,` but that it is broad enough to cover all structures that come within the scope of the annexed claims.

What I claim is:

l. In a system of the class described, means for generating primary X-rays, means for recording X-rays, movable, repeatedly reciprocating 'means for eliminating said secondary X-rays and not obstructing said primary X-rays and a rotary switch for preventing the generation of said primary X- rays when the moving, eliminating means is at rest.

2. In a system of the class described, means 'for generating X-rays, a laminated diaphragm and means for repeatedly reciprocating the same containing in its construction a switch and contacts, this switch and contacts being s0 arranged and disposed and connected to the reciprocating means so that a circuit is opened when the diaphragm is at rest at and about the time it changes its direction of movement.

3. In an X-ray system of the class described,v rotating segments with fixed contacts adapted to bear on 4the same so that said contacts will be connected twice in each. revolution of the disc' and dis-connected twice, a diaphragm and means for mounting HARRY F. WAITE.

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