US648660A - X-ray apparatus. - Google Patents

X-ray apparatus. Download PDF

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Publication number
US648660A
US648660A US72639699A US1899726396A US648660A US 648660 A US648660 A US 648660A US 72639699 A US72639699 A US 72639699A US 1899726396 A US1899726396 A US 1899726396A US 648660 A US648660 A US 648660A
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plate
rays
cathode
anticathodic
osmium
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US72639699A
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Reginald A Fessenden
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
    • H01J35/08—Anodes; Anti cathodes
    • H01J35/112—Non-rotating anodes

Definitions

  • the invention described herein relates to certain improvements in apparatus for the generation of Roentgen or X rays.
  • the invention has for its object a large increase in the quantity of X-rays generated by a current of given potential and frequency
  • the Roentgen or X' rays are generated by the impact of electrically-charged particles from the cathode-pole on a suitable surface such as glass, aluminium, platinum, &c.
  • the cathode is usually made in the form, of a plate 1, suitably secured within the vacuum tube or bulb 2, at or near one end thereof, and is connectedelectrically to the negative pole of the electric generator.
  • the X-ray generator is preferably made in the form of a metal plate or disk 3,suitably supportedin the bulb opposite the cathode 1, which preferably has the side toward the plate 3 made convex, so as to focus the cathode-currents on the plate 8.
  • the generating or anticathodic plate is generally arranged at an angle to the axis'of the cathode-plate, so that the X-rays will be directed through the side of the bulb, and the plate will operate more efficiently in the production of X-rays if it is olectricallyconnected to the positive pole of the electric generator.
  • the anticathodic surface has heretofore been formed by a plate or'disk formed of or coated with platinum. I have found that a surface formed of osmium is much more eflicient in the production of X-rays.
  • the generating or transforming surface is formed of osmium, and by preference such surface is formed by the faceof a metal plate coated with and formed entirely of osmium. While it is considered to be the better practice to connect the anticathodic plate to the positive pole of the electric generator, I do not limit myself :3
  • an antieathodic plate having the surface exposed to the cathode-currents formed of osmium, substantially as setforth.
  • an anticathodic plate formed of osmium substantially as set forth.
  • an anticathodic plate connected to the positive pole of an electric generator and having the surface exposed to cathode-currents, form ed of OlnllllhflilbStR-lltially as set forth.

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  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Description

No. 648,660. f Patented May I, I900.
B.. 'A. Fessmdnm. X-RAIY APPARATUS.
(Application flle'd Aug. 7, 1899'.
(No Model.)
' wuinzsszs: mvs'wrorse, 3
UNITED STATES PATENT Orrrcs.
X- RAY AP PAR ATU S.
SPECIFICATION forming part of Letters Patent hi o.,64=8,660, dated Application filed August 7,1399. SerialNo.7-.6,398. Nomndel.)
To all 7071/0721. it 112107 concern/.-
Be it known that I, REGINALD A. FESSEN- DEN, a citizen of the United States, residing at Allegheny, in the county of Allegheny and State of Pennsylvania, have invented or discovered certain new and useful Improvements in X-Ray Apparatus, of which improvements the following. is a specification.
The invention described herein relates to certain improvements in apparatus for the generation of Roentgen or X rays.
The invention has for its object a large increase in the quantity of X-rays generated by a current of given potential and frequency,
as will be hereinafter more fully described and claimed.
In the accompanying drawing, forming a part of this specification, is shown a Crookes or focus tube having my improvements applied thereto.
As is well known to those skilled in the art,
the Roentgen or X' rays are generated by the impact of electrically-charged particles from the cathode-pole on a suitable surfacesuch as glass, aluminium, platinum, &c. The cathode is usually made in the form, of a plate 1, suitably secured within the vacuum tube or bulb 2, at or near one end thereof, and is connectedelectrically to the negative pole of the electric generator. The X-ray generator is preferably made in the form of a metal plate or disk 3,suitably supportedin the bulb opposite the cathode 1, which preferably has the side toward the plate 3 made convex, so as to focus the cathode-currents on the plate 8. The generating or anticathodic plate is generally arranged at an angle to the axis'of the cathode-plate, so that the X-rays will be directed through the side of the bulb, and the plate will operate more efficiently in the production of X-rays if it is olectricallyconnected to the positive pole of the electric generator. By the impact of the electrically-charged par tieles from the cathode upon the anticathodic surface the energy istransforined to X-rays or the X-rays are generated at points of impact'of the particles. 7
The anticathodic surface has heretofore been formed by a plate or'disk formed of or coated with platinum. I have found that a surface formed of osmium is much more eflicient in the production of X-rays. In the practice of-my invention the generating or transforming surface is formed of osmium, and by preference such surface is formed by the faceof a metal plate coated with and formed entirely of osmium. While it is considered to be the better practice to connect the anticathodic plate to the positive pole of the electric generator, I do not limit myself :3
to such an arrangement.
, I claim herein as my invention 1. As an'improvement in an apparatus for the production of X-rays, an antieathodic plate having the surface exposed to the cathode-currents formed of osmium, substantially as setforth.
' 2. As an improvemcntin apparatus for the production of X-rays, an anticathodic plate formed of osmium, substantially as set forth.
As an improvement iii apparatus for the production of X-rays, an anticathodic plate connected to the positive pole of an electric generator and having the surface exposed to cathode-currents, form ed of OlnllllhflilbStR-lltially as set forth. 1
In testimony whereof I have hereunto set my hand.
' v REGINALD. A. FESSENDEN. \Vitnesses:
DARWIN S.- WoLooT'r, F. EGAIT ER.
US72639699A 1899-08-07 1899-08-07 X-ray apparatus. Expired - Lifetime US648660A (en)

Priority Applications (1)

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US72639699A US648660A (en) 1899-08-07 1899-08-07 X-ray apparatus.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US72639699A US648660A (en) 1899-08-07 1899-08-07 X-ray apparatus.

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US648660A true US648660A (en) 1900-05-01

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US72639699A Expired - Lifetime US648660A (en) 1899-08-07 1899-08-07 X-ray apparatus.

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397338A (en) * 1964-02-26 1968-08-13 Siemens Ag Rotary anode plate for X-ray tubes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397338A (en) * 1964-02-26 1968-08-13 Siemens Ag Rotary anode plate for X-ray tubes

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