Instant portable bar code reader

• US 4,282,425 A
• Filed: 07/25/1979
• Issued: 08/04/1981
• Est. Priority Date: 07/25/1979
• Status: Expired due to Term

• Current Assignee: Norand Technology Corporation
• Original Assignee: Norand Corporation (Baker Hughes Company)
• Inventors: Laser, Vadim, Chadima, George E. Jr.
• Primary Examiner(s): Cook, Daryl W.
• Application Number:
  US06/060,413
• Time in Patent Office: 741 Days
• Field of Search: 235/383, 235/454, 235/455, 235/462, 235/463, 235/472, 235/466, 250/555, 250/566, 250/568, 250/569
• US Class Current: 235/462.31
• CPC Class Codes: G06K 2207/1018 Source control
• CPC Class Codes: G06K 7/10881 constructional details of hand-held scanners

Abstract

A portable instant bar code reader including a hand-held reader unit having a flash type illuminator. The flash type illuminator is triggered to illuminate a bar code label positioned adjacent to a light receiving window of the reader. Reflections from the bar code label are transmitted through the light receiving window and are focused onto a photodiode array by means of a lens. The photodiode array is scanned automatically, and read-out pulses are developed into logic which represents the information contained in the bar code.

Claims

1. A portable instant bar code reader comprising:

a hand-held bar bode reader unit, said hand-held bar code reader unit having a portion thereof defining at least in part an illumination window, a flashable illuminator disposed near said illumination window and means for producing a flash of light therethrough;

said hand-held bar code reader unit having a portion thereof defining at least, in part, a light receiving window for receiving reflections of light emitted through said illumination window;

a photodiode array positioned within said hand-held bar code reader in the path of light rays reflected into and through said light receiving window;

a light gathering means positioned between said light receiving window and said photodiode array for receiving a light pattern from said light receiving window and focusing the same onto said photodiode array;

electronic means for reading out the photodiode array; and

means for producing logic signals which are indicative of the light pattern focused onto said photodiode array.

2. A portable instant bar code reader in accordance with claim 1 wherein said light receiving window is larger in at least one dimension than a label or part of a label with a bar code to be read by said reader and wherein at least a part of said window may be positioned proximate to a bar code label being read thereby.

3. A portable instant bar code reader in accordance with claim 2, wherein means are provided to cause siad flashable illuminator to flash when said light receiving window is positioned proximate to a bar code label to be read by said reader.

4. A portable instant bar code reader in accordance with claim 1, wherein said light receiving window comprises an elongated slot having a length greater than the length of a bar code to be read thereby wherein said illumination window having a slot like configuration with a length greater than the length of said bar code, said light receiving and illumination windows being located adjacent to each other or represented by the same single window and both being positionable adjacent to a bar code label being read by said reader.

5. A portable instant bar code reader in accordance with claim 4, wherein said light gathering means comprises a lens positioned to receive light reflected from a bar code through said light receiving window and to focus the same onto said photodiode array.

6. A portable instant bar code reader in accordance with claim 1, wherein means are provided to automatically clear said photodiode array immediately prior to initiation of a flash from said flashable illumination.

7. A portable instant bar code reader comprising:

a hand-held unit having an illumination window and a light receiving window positioned adjacent one end thereof (or being parts of the same window);

a flash illuminating device positioned behind said illumination window;

said flash illuminating device and illumination window being configured to distribute light across the surface of a bar code being read by said reader, said light receiving window being adjacent to said illumination window and being configured to receive light reflected from the surface of said bar code;

a self-scanning photodiode array disposed within the reader;

means for casting an image of light received through said light receiving window onto said photodiode array;

means to initiate a flash of the flash illuminating device at a desired read position and means for automatically reading out the photodiode array subsequent to a flash.

8. An electroptical pattern or character recognition reader comprising:

a flashable illuminator;

means for triggering the flashable illuminator;

means for positioning the flashable illuminator in such relation to a pattern or character label so as to illuminate the same and develope a reflected light signal therefrom upon the triggering of said flashable illuminator;

an optoelectronic spatial sensor;

means for producing an image of said pattern or character from said reflected light signal and focusing the same onto said optoelectronic spatial sensor;

means for reading out said optoelectronic spatial sensor, and

means for processing the output of said readout means to produce logic signals indicative of said image as focused on said optoelectronic spatial sensor.

9. An electroptical pattern or character recognition reader comprising:

an optical head;

an optoelectronic spatial sensor positioned within said optical head;

a flashable illuminator and means for triggering the same;

said optical head having an optical reflector and concentrator and an illumination window;

said flashable illuminator being disposed within said optical reflector and concentrator at a position to cause a high intensity of light to pass through said illumination window upon the triggering of said flashable illuminator;

said illumination window being positionable near a label bearing a pattern or character to be read,

a light receiving opening formed within said optical head for receiving reflected light from said label;

light gathering means positioned between said light receiving window and said optoelectronic spatial sensor;

means directing light from the light gathering means into said optoelectronic spatial sensor;

means for reading out said optoelectric spatial sensor; and

means for processing the output of said readout means to produce logic signals indicative of said image as focused on said optoelectronic spatial sensor.

10. An electroptical pattern or character recognition reader in accordance with claim 9 wherein said optical reflector is contoured as a portion of an eliptical cylinder, including

said flashable illuminator being disposed at the focal axis of said eliptical cylinder, and

said eliptical cylinder having end reflectors.

11. An electroptical pattern or character recognition reader in accordance with claim 10 wherein said flashable illuminator is disposed toward one side of said light receiving window.

12. An electroptical pattern or character recognition reader in accordance with claim 11 wherein a shield is provided to block a portion of light from the flashable illuminator from entering the light receiving window prior its being reflected from the pattern or character label to be read.