GB166097A - Creación de Inventos y Patentes con Inteligencia Artificial

GB166097A – Improvements in or relating to x-ray apparatus
– Google Patents

GB166097A – Improvements in or relating to x-ray apparatus
– Google Patents
Improvements in or relating to x-ray apparatus

Info

Publication number
GB166097A

GB166097A
GB28092/20A
GB2809220A
GB166097A
GB 166097 A
GB166097 A
GB 166097A
GB 28092/20 A
GB28092/20 A
GB 28092/20A
GB 2809220 A
GB2809220 A
GB 2809220A
GB 166097 A
GB166097 A
GB 166097A
Authority
GB
United Kingdom
Prior art keywords
voltage
switch
cathode
current
time
Prior art date
1920-07-09
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)

Expired

Application number
GB28092/20A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Individual

Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1920-07-09
Filing date
1920-10-04
Publication date
1921-12-15

1920-10-04
Application filed by Individual
filed
Critical
Individual

1921-12-15
Publication of GB166097A
publication
Critical
patent/GB166097A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

Classifications

H—ELECTRICITY

H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR

H05G—X-RAY TECHNIQUE

H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor

H05G1/08—Electrical details

H05G1/26—Measuring, controlling or protecting

H05G1/30—Controlling

H05G1/38—Exposure time

H05G1/40—Exposure time using adjustable time-switch

Abstract

166,097. Coolidge, W. D. July 9, 1920. [Convention date]. Transformers.- R÷ntgenray apparatus operated by a source of current subject to fluctuations of voltage, is provided with means for controlling the emission of rays from the tube tc secure a predetermined radiographic exposure or effect over a working range of voltage even though the voltage of the source varies. In one arrangement an ordinary time switch is used and the heating current of the incandescent cathode of the tube is automatically varied as the supply voltage changes. In another arrangement the heating current for the cathode is maintained constant and a time switch automatically varies the predetermined time necessary to produce the desired effect with a steady voltage. In the first arrangement, the heating current for the cathode 2, Fig. 1, is obtained from a double transformer 3, wound on separate cores. The core 6, Fig. 4, of the main part 4, 8, provides a highly saturated magnetic circuit while the core 7 of the auxiliary part 5, 9 is open and operates far below saturation. The winding of the auxiliary secondary 9 is such that the E.M.F. in the two parts oppose each other and by properly proportioning the windings the resultant E.M.F. supplying the current to the cathode may be made to increase as the primary current decreases and vice versa, and so that the resultant radiographic effect for an exposure controlled by a time switch 25 is substantially constant over a wording range. In the second alternative method the cathode is heated with a current of substantially constant voltage and a time switch is used by which the time of operation is varied inversely with the square of the primary voltage. The current for heating the cathode may be obtained from a separate source of constant voltage, as from a. battery, or the arrangement above described may be used in which the secondary windines 8, 9 are properly proportioned to give a substantially constant voltage in the filament lighting circuit over a working range as described in Specification 104,404. In the time switch an induction disc 30, Fig. 3, is driven by the electromagnets 32, 33 in the primary circuit 12, 13. A movable plate 43 carrying the contact elements 54, 55 of the switch is adapted to be moved into gear with the pinion 44 on the shaft of the disc 30, by an electromagnet 45 when the control switch 50 is closed. A time pointer 56, mounted on the disc 43, is set to the period of exposure or operation required and a pin 53 on the gear wheel 52 is thereby separated to this extent from the switch 54, 55 which is normally closed and is in the circuit 48, 49 which is connected with the primary circuit. On closing the contact switch 50 the time switch gearing 51, 52, is brought into gear with the pinion 44, and the actual time of operation before the pin 53 opens the switch 54, 55 will depend upon and vary inversely as the square of the voltage in the primary circuit 12, 13 which control the disc 30.

GB28092/20A
1920-07-09
1920-10-04
Improvements in or relating to x-ray apparatus

Expired

GB166097A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

US395088A

US1550507A
(en)

1920-07-09
1920-07-09
X-ray apparatus

Publications (1)

Publication Number
Publication Date

GB166097A
true

GB166097A
(en)

1921-12-15

Family
ID=23561644
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB28092/20A
Expired

GB166097A
(en)

1920-07-09
1920-10-04
Improvements in or relating to x-ray apparatus

Country Status (3)

Country
Link

US
(1)

US1550507A
(en)

FR
(1)

FR540823A
(en)

GB
(1)

GB166097A
(en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US4961903A
(en)

1989-03-07
1990-10-09
Martin Marietta Energy Systems, Inc.
Iron aluminide alloys with improved properties for high temperature applications

US6436163B1
(en)

1994-05-23
2002-08-20
Pall Corporation
Metal filter for high temperature applications

DE10332417A1
(en)

2003-07-16
2005-02-24
Sirona Dental Systems Gmbh

Method for controlling an X-ray device and X-ray device

1920

1920-07-09
US
US395088A
patent/US1550507A/en
not_active
Expired – Lifetime

1920-10-04
GB
GB28092/20A
patent/GB166097A/en
not_active
Expired

1921

1921-07-08
FR
FR540823D
patent/FR540823A/en
not_active
Expired

Also Published As

Publication number
Publication date

FR540823A
(en)

1922-07-18

US1550507A
(en)

1925-08-18

Información de contacto