GB1490764A - Automated draughting equipment - Google Patents

Automated draughting equipment

Info

Publication number
GB1490764A
GB1490764A GB1316675A GB1316675A GB1490764A GB 1490764 A GB1490764 A GB 1490764A GB 1316675 A GB1316675 A GB 1316675A GB 1316675 A GB1316675 A GB 1316675A GB 1490764 A GB1490764 A GB 1490764A
Authority
GB
United Kingdom
Prior art keywords
index mark
ordinates
cursor
feature
array
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
GB1316675A
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.)
Ferranti International PLC
Original Assignee
Ferranti PLC
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 Ferranti PLC filed Critical Ferranti PLC
Priority to GB1316675A priority Critical patent/GB1490764A/en
Priority to DE19762612979 priority patent/DE2612979A1/en
Publication of GB1490764A publication Critical patent/GB1490764A/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
    • G06F3/0304—Detection arrangements using opto-electronic means
    • G06F3/0317—Detection arrangements using opto-electronic means in co-operation with a patterned surface, e.g. absolute position or relative movement detection for an optical mouse or pen positioned with respect to a coded surface
    • G06F3/0321—Detection arrangements using opto-electronic means in co-operation with a patterned surface, e.g. absolute position or relative movement detection for an optical mouse or pen positioned with respect to a coded surface by optically sensing the absolute position with respect to a regularly patterned surface forming a passive digitiser, e.g. pen optically detecting position indicative tags printed on a paper sheet

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)
  • Length Measuring Devices By Optical Means (AREA)
  • Position Input By Displaying (AREA)

Abstract

1490764 Determining co-ordinates of position FERRANTI Ltd 15 March 1976 [1 April 1975] 13166/75 Heading G1A In equipment for digitizing the co-ordinates of a feature on a drawing the need for precise alignment of an index mark 11 on cursor 10 with the said feature is avoided by providing an array of photodiodes 16 on the cursor, the outputs of which are sequentially scanned to provide electrical signals indicative of the position of the feature relative to the index mark 11, these signals then being combined with coarse position signals from transducers 20, 21 to provide the accurate co-ordinates. Array 16 may be a monolithic optoelectronic array on a silicon chip and may be located away from the index mark from which it receive light by a mirror (19), Fig. 3 (not shown). It may alternatively comprise photodiodes arrayed to form a ring centred on the index mark Fig. 4 (not shown) or a square "patch". In the latter case logic circuit 18 may determine the co-ordinates of many points of a line constituting the said feature to deduce its characteristics. Transducers 20, 21 may be of the moirÚ fringe type or may be replaced by a grid of wires located beneath the drawing and arranged to detect a magnetic field produced by a coil in the cursor. A second sensing coil may be provided in the cursor to sense its angular orientation. The index mark may comprise a cross-shaped area illuminated by light fibres.
GB1316675A 1975-04-01 1975-04-01 Automated draughting equipment Expired GB1490764A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1316675A GB1490764A (en) 1975-04-01 1975-04-01 Automated draughting equipment
DE19762612979 DE2612979A1 (en) 1975-04-01 1976-03-26 DEVICE FOR DIGITAL REPRESENTATION OF INFORMATION CONTAINED IN A DRAWING

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1316675A GB1490764A (en) 1975-04-01 1975-04-01 Automated draughting equipment

Publications (1)

Publication Number Publication Date
GB1490764A true GB1490764A (en) 1977-11-02

Family

ID=10018074

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1316675A Expired GB1490764A (en) 1975-04-01 1975-04-01 Automated draughting equipment

Country Status (2)

Country Link
DE (1) DE2612979A1 (en)
GB (1) GB1490764A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0031502A2 (en) * 1979-12-31 1981-07-08 International Business Machines Corporation Hand-held apparatus for sensing non-coded images

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0031502A2 (en) * 1979-12-31 1981-07-08 International Business Machines Corporation Hand-held apparatus for sensing non-coded images
EP0031502A3 (en) * 1979-12-31 1982-03-24 International Business Machines Corporation Hand-held apparatus for sensing non-coded images

Also Published As

Publication number Publication date
DE2612979A1 (en) 1976-10-14

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee