Code symbol scanner using a double X bar pattern

• US 4,093,865 A
• Filed: 04/29/1977
• Issued: 06/06/1978
• Est. Priority Date: 04/29/1977
• Status: Expired due to Term

• Current Assignee: National Semiconductor Corporation (Texas Instruments, Inc.)
• Original Assignee: National Semiconductor Corporation (Texas Instruments, Inc.)
• Inventors: Nickl, Franklyn George
• Primary Examiner(s): Nelms, David C.
• Assistant Examiner(s): Tokar, Michael J.
• Application Number:
  US05/792,393
• Time in Patent Office: 403 Days
• Field of Search: 350/6, 350/7, 350/285, 250/566, 250/568, 340/146.3 F, 340/146.3 G, 340/146.3 Z, 340/146.3 AH, 235/61.11 E
• US Class Current: 250/566
• CPC Class Codes: G06K 2207/1012 Special detection of object
• CPC Class Codes: G06K 7/10871 randomly oriented data-fields, code-marks therefore, e.g. concentric circles-code

Abstract

A system for scanning a code symbol consisting of a combination of spaced parallel bars affixed to an object for providing coded information related to the object. A flat panel defines a scanning region adjacent the panel for receiving objects having the code symbol. Light transmissive areas in the panel surface define a "double X bar" pattern consisting of a predetermined configuration of five bars, such as shown in the Drawing. A laser beam is sequentially scanned at an acute angle to the panel surface in planes extending through the five bars into the defined scanning region at prescribed angles in relation to a first direction. When a received object containing said code symbol is moved within the defined scanning region from the first direction with the code symbol facing the panel or facing within almost ninety degrees of a second direction, opposite to the first direction, light scanned into the defined scanning region is reflected by the code symbol to a detection system, and the detection system provides an electrical signal indicative of the coded information.

Claims

1. A system for scanning a code symbol consisting of a combination of spaced parallel bars affixed to an object for providing coded information related to said object, and for providing an electrical signal indicative of said coded information in response to scanning said code symbol, comprising

a housing for defining a scanning region adjacent the housing for receiving objects having said code symbol;

means for providing a light beam;

means for scanning said light beam in a predetermined scanning pattern within said defined scanning region;

means for detecting light having at least a predetermined intensity and for providing an electrical signal in response to detection of said light; and

means for directing light from said scanned light beam that is reflected from a said code symbol on a said received object to the detecting means;

characterized by

the scanning means including an optical system for scanning said light beam at an acute angle to a reference plane defining a boundary of said defined scanning region and in a predetermined scanning pattern that includes

a first bar in said reference plane extending normal to a first direction;

second and third bars in said reference plane disposed along lines that intersect with each other and disposed symmetrically in relation to the first bar; and

fourth and fifth bars in said reference plane disposed along lines that intersect with each other and disposed symmetrically in relation to the first bar;

wherein the second and third bars intersect with each other and/or the fourth and fifth bars intersect with each other; and

wherein the second bar intersects with the fifth bar and the third bar intersects with the fourth bar; and

said pattern further includes

a first plane extending through the first bar into said defined scanning region at an acute angle to said reference plane in said first direction, a second plane extending through the second bar into said defined scanning region at an acute angle to the reference plane at an acute angle to said first direction, a third plane extending through the third bar into said defined scanning region at an acute angle to said reference plane and at an acute angle to said first direction, a fourth plane extending through the fourth bar into said defined scanning region normal to said reference plane and at an acute angle to said first direction, and a fifth plane extending through the fifth bar into said defined scanning region normal to said reference plane and at an acute angle to said first direction,

whereby when a said received object containing a said code symbol is moved within said defined scanning region from said first direction with said code symbol facing said reference plane or facing opposite said first direction, light scanned into said defined scanning region by the scanning means is reflected by said code symbol to the detecting means, and the detecting means provides an electrical signal indicative of said coded information.

2. A system according to claim 1, wherein said acute angle to said first direction at which the second, third, fourth and fifth planes respectively extend is approximately 45°

.

3. A system according to claim 1, wherein said acute angle to said reference plane at which the first plane extends is 45°

plus or minum 15°

.

4. A system according to claim 1, wherein said acute angle to said reference plane at which the second and third planes extend is 45°

plus or minus 15°

.

5. A system according to claim 1, wherein said acute angle to said reference plane at which said light beam is scanned in the fourth and fifth planes is 45°

plus or minus 15°

.

6. A system according to claim 1, wherein said acute angle to said reference plane at which the first plane extends is 45°

plus or minus 15°

;

wherein said acute angle to said reference plane at which the second and third planes extend is 45°

plus or minus 15°

; and

wherein said acute angle to said reference plane at which said light beam is scanned in the fourth and fifth planes is 45°

plus or minus 15°

.

7. A system according to claim 6, wherein said acute angle to said first direction at which the second, third, fourth and fifth planes respectively extend is approximately 45°

.

8. A system according to claim 7, wherein said point of intersection between the second and third bars is in a second direction opposite said first direction from the first bar;

and/or

said point of intersection between the fourth and fifth bars is in said first direction from the first bar.

9. A system according to claim 8, wherein the first bar intersects with the second, third, fourth and fifth bars.

10. A system according to claim 9, wherein the ends of the second, third fourth and fifth bars in said first direction from the first bar are approximately equidistant in said first direction from a straight line extending along and beyond the length of the first bar and the ends of the fourth and fifth bars in said second direction from the first bar are approximately twice the distance in the second direction from said straight line as the ends of the second and third bars in said second direction from said straight line.

11. A system according to claim 10, wherein the first, second, and third bars are at least 6 inches (15 centimeters) long, the fourth and fifth bars are at least 8 inches (20 centimeters) long, the distance between the intersection of the second and fifth bars and the intersection of the third and fourth bars is approximately 2 inches (5 centimeters);

and the distance by which the second and third bars extend past their point of intersection is at least 11/2 inches (33/4 centimeters) and/or the distance by which the fourth and fifth bars extend beyond their point of intersection is at least 11/2 inches (33/4 centimeters).

12. A system according to claim 1, wherein said acute angle to said first direction at which the second, third, fourth and fifth planes respectively extend is approximately 45°

; and

wherein said point of intersection between the second and third bars is in a second direction opposite said first direction from the first bar; and

/or

said point of intersection between the fourth and fifth bars is in said first direction from the first bar.

13. A system according to claim 12, wherein the first bar intersects with the second, third, fourth and fifth bars.

14. A system according to claim 13, wherein the ends of the second, third, fourth and fifth bars in said first direction from the first bar are approximately equidistant in said first direction from a straight line extending along and beyond the length of the first bar and the ends of the fourth and fifth bars in said second direction from the first bar are approximately twice the distance in the second direction from said straight line as the ends of the second and third bars in said second direction from said straight line.

15. A system according to claim 14, wherein the first, second and third bars are at least 6 inches (15 centimeters) long, the fourth and fifth bars are at least 8 inches (20 centimeters) long, the distance between the intersection of the second and fifth bars and the intersection of the third and fourth bars is approximately 2 inches (5 centimeters);

and the distance by which the second and third bars extend past their point of intersection is at least 11/2 inches (33/4 centimeters) and/or the distance by which the fourth and fifth bars extend beyond their point of intersection is at least 11/2 inches (33/4 centimeters).

16. A system for scanning a code symbol consisting of a combination of spaced parallel bars affixed to an object for providing coded information related to said object, and for providing an electrical signal indicative of said coded information in response to scanning said code symbol, comprising

a panel for defining a scanning region adjacent the panel for receiving objects having said code symbol;

means for providing a light beam;

means for scanning said light beam in a predetermined pattern throughout said defined scanning region;

means for detecting light having at least a predetermined intensity and for providing an electrical signal in response to detection of said light; and

means for directing light from said scanned light beam that is reflected from a said code symbol on a said received object to said detecting means;

characterized by

the panel having a surface containing light transmissive areas defining a pattern including

a first bar extending normal to a first direction;

second and third bars intersecting with each other and with the first bar and disposed symmetrically in relation to the first bar with the point of intersection with each other being in a second direction opposite the first direction from the first bar; and

fourth and fifth bars intersecting with each other and with the first bar and disposed symmetrically in relation to the first bar with the point of intersection with each other being in the first direction from the first bar;

wherein the second bar intersects with the fifth bar and the third bar intersects with the fourth bar; and

by the scanning means including an optical system for scanning the light beam at an acute angle to the panel surface and in a said predetermined scanning pattern that includes a first plane extending through the first bar into said defined scanning region at an acute angle to the panel surface in said first direction, a second plane extending through the second bar into said defined scanning region at an acute angle to the panel surface and at an acute angle to said first direction, a third plane extending through the third bar into said defined scanning region at an acute angle to the panel surface and at an acute angle to said first direction, a fourth plane extending through the fourth bar into said defined scanning region normal to the panel surface and at an acute angle to said first direction, and a fifth plane extending through the fifth bar into said defined scanning region normal to the panel surface and at an acute angle to said first direction;

whereby when a said received object containing a said code symbol is moved within said de fined scanning region from said first direction with said code symbol facing the panel or facing said second direction, light scanned into said defined scanning region by the scanning means is reflected by said code symbol to the detecting means, and the detecting means provides an electrical signal indicative of said coded information.

17. A system according to claim 16, wherein said acute angle to the panel surface at which the first plane extends is 45°

plus or minus 15°

;

wherein said acute angle to the panel surface at which the second and third planes extend is 45°

plus or minus 15°

; and

wherein said acute angle to the panel surface at which said light beam is scanned in the fourth and fifth planes is 45°

plus or minus 15°

.

18. A system according to claim 17, wherein said acute angle to said first direction at which the second, third, fourth and fifth planes respectively extend is approximately 45°

.

19. A system according to claim 18, wherein the ends of the second, third, fourth and fifth bars in said first direction from the first bar are approximately equidistant in said first direction from a straight line extending along and beyond the length of the first bar and the ends of the fourth and fifth bars in said second direction from the first bar are approximately twice the distance in the second direction from said straight line as the ends of the second and third bars in said second direction from said straight line.

20. A system according to claim 19, wherein the first, second and third bars are at least 6 inches (15 centimeters) long, the fourth and fifth bars are at least 8 inches (20 centimeters) long, the distance between the intersection of the second and fifth bars and the intersection of the third and fourth bars is approximately 2 inches (5 centimeters);

and the distance by which the second and third bars extend past their point of intersection is at least 11/2 inches (33/4 centimeters) and/or the distance by which the fourth and fifth bars extend beyond their point of intersection is at least 11/2 inches (33/4 centimeters).

21. A system according to claim 16, wherein said acute angle to said first direction at which the second, third, fourth and fifth planes respectively extend is approximately 45°

.

22. A system according to claim 21, wherein the ends of the second, third, fourth and fifth bars in said first direction from the first bar are approximately equidistant in said first direction from a straight line extending along and beyond the length of the first bar and the ends of the fourth and fifth bars in said second direction from the first bar are approximately twice the distance in the second direction from said straight line as the ends of the second and third bars in said second direction from said straight line.

23. A system according to claim 22, wherein the first, second and third bars are at least 6 inches (15 centimeters) long, the fourth and fifth bars are at least 8 inches (20 centimeters) long, the distance between the intersection of the second and fifth bars and the intersection of the third and fourth bars is approximately 2 inches (5 centimeters);

and the distance by which the second and third bars extend past their point of intersection is at least 11/2 inches (33/4 centimeters) and/or the distance by which the fourth and fifth bars extend beyond their point of intersection is at least 11/2 inches (33/4 centimeters).