GB1255001A - Improvements in and relating to electrographic writing apparatus - Google Patents

Improvements in and relating to electrographic writing apparatus

Info

Publication number
GB1255001A
GB1255001A GB3124367A GB3124367A GB1255001A GB 1255001 A GB1255001 A GB 1255001A GB 3124367 A GB3124367 A GB 3124367A GB 3124367 A GB3124367 A GB 3124367A GB 1255001 A GB1255001 A GB 1255001A
Authority
GB
United Kingdom
Prior art keywords
electrodes
lamina
pair
electrographic
potential
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
GB3124367A
Inventor
Brian Stanley Walker
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.)
National Research Development Corp UK
Original Assignee
National Research Development Corp UK
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 National Research Development Corp UK filed Critical National Research Development Corp UK
Priority to GB3124367A priority Critical patent/GB1255001A/en
Publication of GB1255001A publication Critical patent/GB1255001A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Recording Measured Values (AREA)

Abstract

1,255,001. Electrographic tablet. NATIONAL RESEARCH DEVELOPMENT CORP. Dec.6, 1968 [Sept. 6, 1967], No.31243/67. Heading G1N. An electrographic tablet comprises a lamine of resistive material 11 and four elongated resistive electrodes 14-17, connected in series approximately in the form of a rectangle and maintained in electrical contact with the lamina, each electrode having one or more terminals connected thereto and each pair of opposite electrodes arranged to produce in the lamina a substantially uniform potential gradient when energized, each pair of opposed electrodes converging towards one another over parts of the lengths thereof so that the non-uniformity of the potential gradient in the lamina, caused by charges of potential along the energized electrodes, is reduced. A squarewave generator 19 and phase splitter 20 produces two pulse trains in anti-phase which are fed through drivers 21, 22 to corners I, III of the rectangle to drive them in alternation at V volts and earth potential, the other corners II, IV being maintained continuously at V volts and earth. Thus a probe 23 in contact with the lamina is at potentials representative alternately of its x and y co-ordinates with corner IV as origin, which potentials are fed to respective terminals 30, 31 by an emitter follower and appropriate ones of gates 26, 27 and filters 28, 29. The electrodes are so shaped that for any pair of directly opposed points on opposite pairs of electrodes the sum of the resistance across the lamina between the points and the resistance of the lengths of electrode between each point and the nearest adjacent terminal is substantially a constant.
GB3124367A 1967-09-06 1967-09-06 Improvements in and relating to electrographic writing apparatus Expired GB1255001A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3124367A GB1255001A (en) 1967-09-06 1967-09-06 Improvements in and relating to electrographic writing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3124367A GB1255001A (en) 1967-09-06 1967-09-06 Improvements in and relating to electrographic writing apparatus

Publications (1)

Publication Number Publication Date
GB1255001A true GB1255001A (en) 1971-11-24

Family

ID=10320195

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3124367A Expired GB1255001A (en) 1967-09-06 1967-09-06 Improvements in and relating to electrographic writing apparatus

Country Status (1)

Country Link
GB (1) GB1255001A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2522425A1 (en) * 1982-02-26 1983-09-02 Spectec Analogue signal detector for e.g. joystick - has rectangular resistive panel with known time dependent voltages applied to X and Y coordinates

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2522425A1 (en) * 1982-02-26 1983-09-02 Spectec Analogue signal detector for e.g. joystick - has rectangular resistive panel with known time dependent voltages applied to X and Y coordinates

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