GB374913A - Improvements in and relating to x-ray equipments - Google Patents
Improvements in and relating to x-ray equipmentsInfo
- Publication number
- GB374913A GB374913A GB5423/31A GB542331A GB374913A GB 374913 A GB374913 A GB 374913A GB 5423/31 A GB5423/31 A GB 5423/31A GB 542331 A GB542331 A GB 542331A GB 374913 A GB374913 A GB 374913A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tube
- current
- filament
- transformer
- focal spot
- Prior art date
- 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
Links
- 238000007689 inspection Methods 0.000 abstract 2
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
- H05G1/52—Target size or shape; Direction of electron beam, e.g. in tubes with one anode and more than one cathode
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- X-Ray Techniques (AREA)
Abstract
374,913. R÷ntgen-ray tubes. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London.-(Assignees of Kersley, W. K. ; 1606, Randolph Road, Schenectady, New York, U.S.A.) Feb. 20, 1931, No. 5423. Convention date, Feb. 21, 1930. [Class 39 (i).] The area of the focal spot on the anode 2 of the X-ray tube 1 is automatically varied as the space current through the tube and the voltage of the supply 22 vary. A focusing device 11 surrounding the thermionic cathode 6 of the tube 1 is connected to a vacuum tube 27 which is connected in series with the hightension circuit through the transformer 20 and rectifier or translator 21. The voltage drop across the tube 27 determines the negative bias on the device 11 and is controlled by varying the current in the filament 30. A variable resistance 24 varies simultaneously the current in the cathode 6 and in the filament 30 to increase the current through the tube 1 and the area of the focal spot. A transformer 60 increases the current through the filament 30, to increase the focal spot, as the voltage of the supply 22 increases. A variable resistance 33 is included in the circuit of the filament 30 and another may be included in the lead 28. The Specification as open to inspection under Sect. 91 (3) (a) comprises also an arrangement with the transformer 60 omitted and other automatic focusing arrangements similar to those described in Specification 355,978 as open to inspection under Sect. 91 (3) (a). This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US430418A US1946287A (en) | 1930-02-21 | 1930-02-21 | X-ray equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB374913A true GB374913A (en) | 1932-06-20 |
Family
ID=23707477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5423/31A Expired GB374913A (en) | 1930-02-21 | 1931-02-20 | Improvements in and relating to x-ray equipments |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US1946287A (en) |
| BE (1) | BE377546A (en) |
| GB (1) | GB374913A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4594630A (en) * | 1980-06-02 | 1986-06-10 | Electric Power Research Institute, Inc. | Emission controlled current limiter for use in electric power transmission and distribution |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2421994A (en) * | 1943-03-23 | 1947-06-10 | Gen Electric | Electric valve system |
| US2518539A (en) * | 1944-09-27 | 1950-08-15 | Picker X Ray Corp Waite Mfg | Filament current stabilizer |
| US2878393A (en) * | 1955-01-12 | 1959-03-17 | Picker X Ray Corp Waite Mfg | X-ray tube with variable focal spot and control means therefor |
| US4104530A (en) * | 1976-04-01 | 1978-08-01 | Thoro-Ray Inc. | Dental and medical X-ray apparatus |
| DE3025107A1 (en) * | 1980-07-02 | 1982-01-14 | Siemens AG, 1000 Berlin und 8000 München | X-RAY DIAGNOSTIC DEVICE FOR RECORDING AND SCANNING |
-
1930
- 1930-02-21 US US430418A patent/US1946287A/en not_active Expired - Lifetime
-
1931
- 1931-02-01 BE BE377546A patent/BE377546A/fr unknown
- 1931-02-20 GB GB5423/31A patent/GB374913A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4594630A (en) * | 1980-06-02 | 1986-06-10 | Electric Power Research Institute, Inc. | Emission controlled current limiter for use in electric power transmission and distribution |
Also Published As
| Publication number | Publication date |
|---|---|
| US1946287A (en) | 1934-02-06 |
| BE377546A (en) | 1931-03-31 |
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