Manual image scanning system

• US 4,581,761 A
• Filed: 05/20/1985
• Issued: 04/08/1986
• Est. Priority Date: 05/22/1984
• Status: Expired due to Term

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Sato, Yoichi, Ichinokawa, Kazuo, Ohtsuka, Tadashi
• Primary Examiner(s): Boudreau, Leo H.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US06/736,274
• Time in Patent Office: 323 Days
• Field of Search: 382/3, 382/13, 382/59, 178/18, 178/19
• US Class Current: 382/313
• CPC Class Codes: G06F 3/03544 having dual sensing arrangement, e.g. two balls or two coils used to track rotation of the pointing device
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/046 by electromagnetic means
• CPC Class Codes: G06V 30/142 using hand-held instruments; Constructional details of the instruments

Abstract

A manual image scanning system is operative to read image data of figures or letters depicted on a sheet of paper based on manual operation to input them to a personal computer for data processing. The manual image scanning system comprises a data tablet or a digitizer in which magnetostriction pulses propagate, the data tablet being adapted so that a sheet of paper on which a figure is drawn is placed thereon, and a compact manual image scanner adapted to be manually movably placed on the data tablet, the manual image scanner having a first function to recognize the figure drawn on the paper to produce data indicative of image of the figure, and a second function to sense a position of the scanner to produce data indicative of the position of the scanner. The scanning system further comprises high speed image processing circuitry responsive to the image data and the position data from the scanner to compute coordinates of the scanner on the data tablet, thereby recognizing which portion of the data tablet the image data corresponds to. Thus, this system can sufficiently exhibit features provided by the data tablet and the optical figure recognition device.

Claims

1. A manual image scanning system comprising:

(a) tablet means in which magnetostriction pulses propagate, said tablet means being adapted so as to place thereon a sheet of paper on which a figure is drawn,

(b) manual image scanner means adapted to be manually movably placed on said tablet means, said scanner means having a first function to recognize said figure drawn on said paper to produce data indicative of image of said figure, and a second function to sense said magnetostriction pulses for detecting a position of said scanner means to produce data indicative of the position of said scanner means, and

(c) processor means responsive to said image data and said position data from said manual image scanner means to compute coordinates of said scanner means, thereby recognizing which portion of said tablet means the image data corresponds to.

2. A manual image scanning system as set forth in claim 1, wherein said tablet means is provided with magnetostriction pulse generating means for allowing first and second magnetostrction pulses to propagate in said tablet means in directions different from each other.

3. A manual image scanning system as set forth in claim 2, said magnetostriction pulse generating means comprises two one-turn coils for generating magnetostriction pulses in X- and Y-axes, respectively, a magnetostriction pulse propagation system being constituted by said tablet means and means for applying high voltage impulses to said one-turn coils.

4. A manual image scanning system as set forth in claim 3, wherein said tablet means comprises a magnetrostriction metal plate in which a magnetostriction wave based on said magnetostriction phenomenon propagates, and a magnetic plate provided on one side of said magnetostriction metal plate, said magnetic plate being magnetized so as to allow said magnetrostriction plate to be magnetized in a direction parallel to the plate surface thereof.

5. A manual image scanning system as set forth in claim 2, wherein said tablet means comprises a magnetrostriction metal plate in which a magnetostriction wave based on said magnetostriction phenomenon propagates, and a magnetic plate provided on one side of said magnetostriction metal plate, said magnetic plate being magnetized so as to allow said magnetostriction plate to be magnetized in a direction parallel to the plate surface thereof.

6. A manual image scanning system as set forth in claim 1, wherein said manual image scanner means comprises optical figure or letter recognition means for performing said first function, and magnetic detection means for performing said second function.

7. A manual image scanning system as set forth in claim 6, wherein said manual image scanner means is provided on the upper surface thereof with a plurality of function keys for allowing said processor means to effect predetermined image processings.

8. A manual image scanning system as set forth in claim 6, wherein said manual image scanner means is provided on the back side thereof with a switch for a figure recognition operation, a pair of magnetic signal sensing coils, and a window opened through the bottom portion for reading the image of said letter drawn on said paper.

9. A manual image scanning system as set forth in claim 6, wherein said optical figure or letter recognition means includes an image sensing circuit, said magnetic detector means includes a magnetic signal sensing circuit, and said switch is coupled to a mode detection circuit.

10. A manual image scanning system as set forth in claim 6, wherein said manual image scanner means further comprises a LED lamp array for irradiating light onto said paper, an optical lens system, a one-dimensional charge coupled sensor device, a height adjustment plate, and a binary coding circuit board.

11. A manual image scanning system as set forth in claim 1, wherein said processor means comprises a counter circuit, an infinitesimal signal detection circuit responsive to an output from said magnetic signal sensing circuit, a buffer memory circuit responsive to an output from said image sensing circuit, and a processing unit responsive to an output from said mode detection circuit and an output from said buffer memory circuit, said processing unit being operative to provide a command to said image sensing circuit and to transmit image processing data to an external computer or receive it therefrom.

12. A manual image scanning system as set forth in claim 1, wherein said tablet means comprises a magnetostriction metal plate in which a magnetostriction wave based on said magnetostriction phenomenon propagates, and a magnetic plate provided on one said of said magnetostriction metal plate, said magnetic plate being magnetized so as to allow said magnetostriction plate to be magnetized in a direction parallel to the plate surface thereof.

13. A manual image scanning system as set forth in claim 12, 5 or 4, wherein said metal plate is comprised of a nickel plate.