Data reading device

• US 4,041,279 A
• Filed: 08/04/1975
• Issued: 08/09/1977
• Est. Priority Date: 08/04/1975
• Status: Expired due to Term

• Current Assignee: DBS, Inc.
• Original Assignee: Addressograph Multigraph Corporation
• Inventors: Foote, Francis C.
• Primary Examiner(s): Cook, Daryl W.
• Application Number:
  US05/601,541
• Time in Patent Office: 736 Days
• Field of Search: 235/61.12 R, 235/61.12 N, 235/61.12 M, 235/61.11 D, 235/61.11 E, 235/61.7 B, 340/146.3 D
• US Class Current: 235/440
• CPC Class Codes: G06K 7/016 Synchronisation of sensing process
• CPC Class Codes: G06K 7/084 sensing magnetic material by relative movement detecting flux changes without altering its magnetised state
• CPC Class Codes: G06K 7/14 using light without selection of wavelength, e.g. sensing reflected white light G06K7/10831 - G06K7/1097 take precedence

Abstract

A device is provided for reading optical and magnetic data and providing signals representative thereof, said device including means for establishing a predetermined time or spacial reference between the optical and magnetic data sets. In one embodiment the optical and magnetic read heads are mounted in parallel alignment with the path of document travel to reduce timing errors due to skewing. In a second embodiment the heads are mounted side-by-side such that timing errors due to speed variations and thermal expansions are reduced.

Claims

1. A device for reading documents containing optical data elements and magnetic data elements separate from said optical data elements and with fixed spacial relationships between said optical and magnetic data elements, said device comprising:

magnetic read means for sensing magnetic data elements from a document and providing first signals representative thereof,

optical read means for sensing said optical data elements from the document and providing second signals representative thereof, and

means associated with said magnetic and optical read means for establishing a predetermined reference between said first and second signals whereby the presence or absence of the spacial relationship between the optical and magnetic data elements may be determined.

2. The device set forth in claim 1 wherein said predetermined reference defines at least in part a perceived spacial base.

3. The device set forth in claim 1 wherein said predetermined base defines at least in part a predetermined time base.

4. The device set forth in claim 3 wherein said means for establishing the time base between said first and second signals includes time delay circuit means.

5. The device set forth in claim 3 wherein said means for establishing the time base between said first and second signals includes logic means for digitally establishing the time base.

6. The device set forth in claim 1 wherein said means for establishing the reference between said first and second signals comprises means for establishing a predetermined spacial relationship between said optical read means and magnetic read means.

7. The device set forth in claim 6 wherein said magnetic read means includes a magnetic read head having an effective reading aperture at a first location, said optical read means including a radiation source providing radiation which intersects the data area at a second location and a radiation sensor for sensing radiation reflected therefrom, said spacial relationship being defined at least in part by the distance between said first and second locations.

8. The device set forth in claim 7 wherein said optical and magnetic data elements are disposed in a common data area on the document being read, said device further including motive means for effecting relative movement between the document being read and said magnetic and optical read means, said first and second locations lying along a line substantially parallel to said direction of relative movement.

9. The device set forth in claim 8 wherein the data area on the document being read is of generally elongated configuration, said direction of relative movement being substantially parallel to the data area during reading.

10. In combination:

a document containing optical data elements and magnetic data elements separate from said optical data elements and with a fixed spacial relationship between said optical and magnetic data elements, and

a device for reading document, said device comprising;

magnetic read means for sensing said magnetic data elements from a document and providing for signals representative thereof,

optical read means for sensing said optical data elements from the document and providing second signals representative thereof;

motive means for effecting relative movement between said document being read and said magnetic and optical read means, and

means associated with said magnetic and optical read means for establishing a predetermined reference between said first and second signals whereby the presence or absence of the spacial relationship between the optical and magnetic data elements may be determined.

11. The combination set forth in claim 10 wherein said optical and magnetic data elements are disposed in a common area on said document, said data area being of generally elongated configuration and said direction of relative movement being substantially parallel to said data area during reading.