Instant portable bar code reader

• US 6,158,661 A
• Filed: 06/06/1995
• Issued: 12/12/2000
• Est. Priority Date: 12/28/1981
• Status: Expired due to Term

• Current Assignee: Intermec IP Corporation (Honeywell International Inc.)
• Original Assignee: Intermec IP Corporation (Honeywell International Inc.)
• Inventors: Chadima, Jr., George E., Laser, Vadim
• Primary Examiner(s): Pitts, Harold I.
• Application Number:
  US08/476,543
• Time in Patent Office: 2,016 Days
• Field of Search: 235/472.01, 235/462.46
• US Class Current: 235/472.01
• CPC Class Codes: G06K 7/10851 Circuits for pulse shaping, amplifying, eliminating noise signals, checking the function of the sensing device basic electronic circuitry H03

Abstract

In an exemplary embodiment, a hand-held bar code reader has a handle portion and a reader head portion which may be held spaced from a bar code data carrier during a reading operation. Light energy is directed outwardly through a window so as to illuminate a bar code sensing region in front of the window having a depth dimension of at least about ten millimeters, and an optical system focuses bar code patterns in the sensing region onto an image photosensor in the reader unit with a resolution so as to read e.g., bar code formats with a minimum bar or space width of about 0.0075 inch, or even less. Preferably the light source is of an electronically triggerable instant response type and is located substantially within the reader head portion. The bar code image is converged through a generally rectangular optical aperture and is decoded by a battery powered programmable decoder located substantially within the handle portion.

Claims

1. A portable bar code reader system capable of reading bar codes of a plurality of bar code types, said reader system comprising:

(a) a hand-held bar code reader unit;

(b) said hand-held bar code reader unit having a bar code sensing region, and having a window to be directed toward a bar code of one of a plurality of bar code types in said sensing region and providing for transmission of light between the bar code sensing region and the interior of said hand-held bar code reader unit;

(c) a photodetector positioned within said hand-held bar code reader unit for sensing light reflected from a bar code located within said bar code sensing region, so as to generate a bar code signal representing the illuminated bar code;

(d) said hand-held bar code reader unit having a light path from the window to the photodetector, said light path oriented to permit said phtotdetector to sense light reflected from the bar code along said path while the reader unit is variably spaced from the bar code and free of any contact with the bar code as a whole during reading of a complete line of bar code information;

(e) a printed circuit board in said hand-held bar code reader unit having circuitry thereon connected with said photodetector, said circuitry receiving said bar code signal generated by said photodetector; and

(f) a bar code signal processor located in said hand-held reader unit responsive to said bar code signal for determining the type of bar code in said sensing region and for decoding the information contained in said bar code signal into a usable form, said processor permitting the successive reading of different ones of said bar code types.

2. A portable bar code reader system according to claim 1 wherein said bar code signal processor is a programmed decoder.

3. A portable bar code reader system according to claim 2 wherein said programmed decoder includes a storage means for storing programmed information.

4. A portable bar code reader system according to claim 3 wherein said storage means includes an application program means, said application program means for determining whether said bar code signal matches type information contained within said application program means thereby providing an autodiscrimination function for determining which type of said bar code said bar code signal matches.

5. A portable bar code reader system according to claim 4 wherein said programmed decoder includes a microprocessor means for operating said application program means to determine the type of said bar code and the contents of said bar code.

6. A portable bar code reader system according to claim 5 wherein said storage means is a programmable read only memory external to said microprocessor means.

7. A portable bar code reader system according to claim 6 wherein said storage means is a read only memory internal to said microprocessor means.

8. A portable bar code reader system according to claim 1 wherein said bar code signal processor uses a decision tree for determining the type of bar code said bar code signal represents.

9. A portable bar code reader system according to claim 1 wherein said type of bar code includes UPC type bar codes.

10. A portable bar code reader system according to claim 1 wherein said type of bar code includes EAN type bar codes.

11. A portable code reading system for reading a plurality of code types each having elements of different light reflectivity, said code reading system comprising:

(a) a user-supported reader unit;

(b) said user-supported reader unit having a window, and having a code sensing region located in front of said window, said window providing for the transmission of light between the code sensing region and the interior of said user-supported reader unit;

(c) a photodetector positioned within said user-supported reader unit for sensing light reflected from code element located within said code sensing region while the user-supported reader unit is variably spaced from and free of any contact with the code elements as a whole during the sensing, said photodetector generating electrical code signals in accordance with light received from said code elements located within said code sensing region;

(d) a light source assembly positioned within said user-supported reader unit for illuminating code elements located within said code sensing region; and

(e) circuitry including a microprocessor located within said user-supported reader unit responsive to said electrical code signals for automatically discriminating between and identifying each of a plurality of code types successively presented in said code sensing region, and resolving said electrical code signals into a usable form regardless of which one of said plurality of code types said electrical code signals represent.

12. A portable code reading system for reading a plurality of code types each having elements of different light reflectivity, said code reading system comprising:

(a) a user-supported reader unit;

(b) said user-supported reader unit having a window, and having a code sensing region located in front of said window, said window providing for the transmission of light between the code sensing region and the interior of said user-supported reader unit;

(c) a photodetector positioned within said user-supported reader unit for sensing light reflected from code element located within said code sensing region while the user-supported reader unit is variably spaced from and free of any contact with the code elements as a whole during the sensing, said photodetector generating electrical code signal, in accordance with light received from said code elements located within said code sensing region;

(d) a light source assembly positioned within said user-supported reader unit for illuminating code elements located within said code sensing region; and

(e) an actuator;

(f) control circuitry including a microprocessor located within said reader unit, said control circuitry responsive to said actuator for initiating the reading of a code, and operable to terminate the reading of a code upon successful conversion of said electrical signals into a usable form by said control circuitry; and

(g) said control circuitry completing the successive reading of each of a plurality of codes, each of said plurality of codes of a different code type, upon corresponding successive actuations of said actuator as each of said plurality of codes is successively presented in said code sensing region without requiring any user input or modification to said portable code reading system between said successive actuations.