GB1122725A - Electrical circuit having an inductive load - Google Patents

Electrical circuit having an inductive load

Info

Publication number
GB1122725A
GB1122725A GB47517/66A GB4751766A GB1122725A GB 1122725 A GB1122725 A GB 1122725A GB 47517/66 A GB47517/66 A GB 47517/66A GB 4751766 A GB4751766 A GB 4751766A GB 1122725 A GB1122725 A GB 1122725A
Authority
GB
United Kingdom
Prior art keywords
windings
deflection
magnitude
switches
resistors
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
Application number
GB47517/66A
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB1122725A publication Critical patent/GB1122725A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G1/00—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data
    • G09G1/06—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows
    • G09G1/08—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows the beam directly tracing characters, the information to be displayed controlling the deflection and the intensity as a function of time in two spatial co-ordinates, e.g. according to a cartesian co-ordinate system
    • G09G1/10—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data using single beam tubes, e.g. three-dimensional or perspective representation, rotation or translation of display pattern, hidden lines, shadows the beam directly tracing characters, the information to be displayed controlling the deflection and the intensity as a function of time in two spatial co-ordinates, e.g. according to a cartesian co-ordinate system the deflection signals being produced by essentially digital means, e.g. incrementally
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G1/00—Control arrangements or circuits, of interest only in connection with cathode-ray tube indicators; General aspects or details, e.g. selection emphasis on particular characters, dashed line or dotted line generation; Preprocessing of data
    • G09G1/04—Deflection circuits ; Constructional details not otherwise provided for

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Details Of Television Scanning (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

1,122,725. Cathode-ray tube circuits; semiconductor switching circuits. INTERNATIONAL BUSINESS MACHINES CORP. 24 Oct., 1966 [26 Nov. 1965], No. 47517/66. Headings H3T and H4T. The deflection windings of an electromagnetically - deflected cathode-ray tube and to which a current of varying magnitude is supplied are shunted by a plurality of resistors the number of which is varied directly as the magnitude of the current. The invention is concerned with a display system in which the tube beam is deflected in straight lines between X, Y co-ordinate positions specified by digital signals from a computer, such signals being converted to analogue form to provide the deflection currents for the tube windings, the operation of the arrangement according to the invention resulting in a variation of the damping of the windings in accordance with the magnitude of the deflection currents so that the trace produced is of uniform velocity and therefore of constant intensity independently of the length of such trace. Thus, considering the X deflection circuit, the two halves X 1 X of the pushpull deflection windings which are shunted by respective adjustable resistors R R, are connected to one end of binary weighted resistors R/1, R/2 . . . R/8 and #R/1, #R/2 ... #R/8 the other ends of which are connected via diodes D1 . . . D8 to transistor switches 21 ... 28 which, when conductive, connect such ends to the potential +V which is the potential at the mid point of windings X 1 , X. Thus, in accordance with the state of the switches the latter are shunted by one or more of the resistors. The switches are operated by the outputs of a counter 30 the four stages of which are set by the four most significant digits in the " word " which specifies the larger of the X, Y co-ordinates of the end-point of the intended trace. This, which may be a ten " bit " word, is supplied from a computer to register 11 and after conversion to analogue form in D/A converter 12 is supplied via buffer amplifiers 14, 15 to the deflection windings. The counter thus sets the switches in accordance with the magnitude of the larger of the X and Y deflections (the Y circuitry 201 being similar to the X circuitry 20) and this setting is then reduced to zero by an oscillator 34 connected to the counter via AND gate 36 which is enabled by a signal from the computer at an appropriate time.
GB47517/66A 1965-11-26 1966-10-24 Electrical circuit having an inductive load Expired GB1122725A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US50971765A 1965-11-26 1965-11-26

Publications (1)

Publication Number Publication Date
GB1122725A true GB1122725A (en) 1968-08-07

Family

ID=24027822

Family Applications (1)

Application Number Title Priority Date Filing Date
GB47517/66A Expired GB1122725A (en) 1965-11-26 1966-10-24 Electrical circuit having an inductive load

Country Status (9)

Country Link
US (1) US3431457A (en)
BE (1) BE689050A (en)
CH (1) CH439816A (en)
DE (1) DE1524435B2 (en)
ES (1) ES333739A1 (en)
FR (1) FR1499819A (en)
GB (1) GB1122725A (en)
NL (1) NL153346B (en)
SE (1) SE336482B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4254468A (en) * 1979-05-03 1981-03-03 Eltra Corporation Typesetter character generating apparatus
US4298945A (en) * 1978-05-12 1981-11-03 Eltra Corporation Character generating method and apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3983453A (en) * 1974-05-08 1976-09-28 Sperry Rand Corporation Switchable constant current sink
DE102006035793B8 (en) * 2006-07-28 2011-01-05 Global Beam Technologies Ag Electron beam system for material processing and Stromaddieranordnung for rapid control of an inductance

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3325803A (en) * 1964-10-01 1967-06-13 Ibm Deflection control circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4298945A (en) * 1978-05-12 1981-11-03 Eltra Corporation Character generating method and apparatus
US4254468A (en) * 1979-05-03 1981-03-03 Eltra Corporation Typesetter character generating apparatus

Also Published As

Publication number Publication date
DE1524435B2 (en) 1971-09-16
US3431457A (en) 1969-03-04
ES333739A1 (en) 1967-10-01
SE336482B (en) 1971-07-05
DE1524435A1 (en) 1970-10-01
CH439816A (en) 1967-07-15
BE689050A (en) 1967-03-31
FR1499819A (en) 1967-10-27
NL153346B (en) 1977-05-16
NL6616129A (en) 1967-05-29

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