Split optics focusing apparatus for CCD-based bar code scanner

• US 5,744,790 A
• Filed: 01/25/1996
• Issued: 04/28/1998
• Est. Priority Date: 01/25/1996
• Status: Expired due to Term

• Current Assignee: Symbol Technologies, LLC (Zebra Technologies Corporation)
• Original Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Inventors: Li, Yajun
• Primary Examiner(s): Hajec, Donald T.
• Assistant Examiner(s): Rodriguez, Douglas X.
• Application Number:
  US08/591,099
• Time in Patent Office: 824 Days
• Field of Search: 235/462, 235/472, 359/629, 250/205, 250/568, 250/201.4, 356/153
• US Class Current: 235/462.24
• CPC Class Codes: G06K 7/10792 Special measures in relation to the object to be scanned

Abstract

A bar code scanner comprises a radiant energy source for generating a radiant energy beam of a given configuration, a detector for generating output electrical signals indicative of radiant energy incident thereon, an optical system having a focus portion for transmitting segments of the radiant energy beam in separate optical paths extending from the scanner to a bar code to be scanned and a scan portion for collecting radiant energy transmitted by the focus portion as modified by the bar code and applying the same to the detector and a decoder for decoding the output electrical signals of the detector to provide indication of information contained in the bar code.

Claims

1. A bar code scanner comprising:

a) a focusing energy source for generating a focusing energy beam of a given configuration;

b) a radiant energy source for generating a radiant energy for illuminating a bar code to be scanned,

c) a detector for generating output electrical signals indicative of said radiant energy incident thereon;

d) an optical system having

1) a focus portion for transmitting segments of said focusing energy beam in separate optical paths extending from said scanner to said bar code and

2) a scan portion for collecting said radiant energy incident on said bar code and applying said collected radiant energy to said detector; and

e) a decoder for decoding said output electrical signals of said detector to provide indication of information contained in said bar code.

2. The bar code scanner claimed in claim 1, wherein said focus portion of said optical system comprises first and second focusing energy reflection means respectively for reflecting said segments of said focusing energy beam into first parts of said separate optical paths.

3. The bar code scanner claimed in claim 2, wherein said first and second focusing energy reflection means are fixedly supported in said bar code scanner and wherein said first parts of said separate optical paths are in alignment.

4. The bar code scanner claimed in claim 3, wherein said optical system has an optical axis and wherein said first parts of said separate optical paths are orthogonal to said optical axis.

5. The bar code scanner claimed in claim 4, wherein said focus portion of said optical system further includes third and fourth focusing energy reflection means disposed respectively in said first parts of said separate optical paths and in focusing energy receiving relation respectively with said first and second focusing energy reflection means.

6. The bar code scanner claimed in claim 5, wherein said third and fourth focusing energy reflection means are fixedly supported in said bar code scanner and reflect focusing energy received respectively from said first and second focusing energy reflection means into respective second parts of said separate optical paths.

7. The bar code scanner claimed in claim 6, wherein said second parts of said separate optical paths intersect one another.

8. The bar code scanner claimed in claim 1, wherein said scan portion of said optical system includes at least one lens.

9. The bar code scanner claimed in claim 1, wherein said detector comprises a CCD array.

10. The bar code scanner claimed in claim 1, wherein said focusing energy source comprises at least one light-emitting diode.

11. The bar code scanner claimed in claim 1, wherein said focusing energy source issues said focusing energy beam in circular configuration.

12. The bar code scanner claimed in claim 1, wherein said focusing energy source issues said focusing energy beam in rectangular configuration.

13. The bar code scanner claimed in claim 11, further including lens means for converting said circular configuration focusing energy beam into rectangular configuration.

14. The bar code scanner claimed in claim 1, wherein said radiant energy source generates said radiant energy in isolation from said separate optical paths.

15. The bar code scanner claimed in claim 14, wherein said radiant energy source comprises a plurality of radiant energy generators generating said radiant energy.

16. The bar code scanner claimed in claim 14, wherein said scan portion of said optical system includes at least one lens and wherein said radiant energy generators are disposed circumferentially of said lens.

17. The bar code scanner claimed in claim 14, further including a controller for energizing said focusing energy source to provide generation of said focusing energy beam and for energizing said radiant energy source to provide for generation of said radiant energy.

18. The bar code scanner claimed in claim 1, including a housing jointly supporting said focusing energy source, said radiant energy source, said detector, said optical system and said decoder.

19. The bar code scanner claimed in claim 18, wherein said housing is of pistol-like configuration having a barrel axis, said optical system having its portions disposed along respective first and second axes parallel to said barrel axis.

20. The bar code scanner claimed in claim 19, wherein said scan portion of said optical system includes a lens disposed along said second axis.

21. The bar code scanner claimed in claim 20, wherein said radiant energy source includes radiant energy generating means for generating said radiant energy isolated from said segments of said focusing energy beam.

22. The bar code scanner claimed in claim 21, wherein said radiant energy generating means comprises a plurality of radiant energy generators supported in said housing in locations circumscribing said lens.

23. The bar code scanner claimed in claim 21, including an operating member for separately causing said radiant energy source to generate said radiant energy beam and said focusing energy source to generate said focusing energy beam.

24. The bar code scanner claimed in claim 23, wherein said operating member comprises a switch actuator disposed on said grip of said pistol-shaped housing.

25. A method for use in bar code scanning comprising said steps of:

a) generating a focusing energy beam with a given geometric configuration;

b) segmenting said generated focusing energy beam into segments;

c) projecting said segments of said generated focusing energy beam onto said bar code;

d) moving a scanner housing, in which said generating and segmenting steps are practiced, relative to said bar code; and

e) discontinuing moving said scanner housing when it is moved into a position wherein said segments form, on said bar code, said generated focusing energy beam in its given geometric configuration.

26. The method claimed in claim 25, including said further step of scanning said bar code when said scanner housing is located at said position.

27. The method claimed in claim 26, wherein said scanning step is performed by transmitting onto said bar code a radiant energy generated separately from said focusing energy beam.

28. The method claimed in claim 25, wherein said given geometric configuration is selected to be circular and wherein said segments are selected to be of respective half-circles.

29. The method claimed in claim 25, wherein said given configuration is selected to be rectangular and wherein said segments are selected to be of respective half rectangles.

30. A bar code scanner comprising:

a) a focusing energy source for generating a focusing beam of a circular configuration;

b) a radiant energy source for generating a radiant energy for illuminating a bar code to be scanned;

c) a detector for generating output electrical signals indicative of said radiant energy incident thereon;

d) an optical system having

1) a focus portion for transmitting different half-circles of said focusing beam in separate optical paths extending from said scanner to said bar code, said focus portion comprising first and second focusing energy reflection means respectively disposed to reflect said different half-circles of said focusing beam into first parts of said separate optical paths and

2) a scan portion for collecting said radiant energy incident on said bar code and applying said collected radiant energy to said detector; and

e) a decoder for decoding said output electrical signals of said detector to provide indication of information contained in said bar code.

31. A bar code scanner comprising:

a) a focusing source for generating a focusing beam of a rectangular configuration;

b) a radiant energy source for generating a radiant energy for illuminating a bar code to be scanned;

c) a detector for generating output electrical signals indicative of said radiant energy incident thereon;

d) an optical system having

1) a focus portion for transmitting different half-rectangles of said focusing beam in separate optical paths extending from said scanner to said bar code, said focus portion comprising first and second focusing energy reflection means respectively disposed to reflect said different half-rectangles of said focusing beam into first parts of said separate optical paths and

2) a scan portion for collecting radiant energy incident on said bar code and applying said collected radiant energy to said detector; and

e) a decoder for decoding said output electrical signals of said detector to provide indication of information contained in said bar code.

32. A bar code scanner comprising:

a) a focusing source for generating a focusing beam of a circular configuration;

b) a radiant energy source for generating a radiant energy for illuminating a bar code to be scanned;

c) a detector for generating output electrical signals indicative of said radiant energy incident thereon;

d) an optical system having

1) a lens means for converting said circular configuration radiant energy beam into rectangular configuration;

2) a focus portion for transmitting different half-rectangles of said focusing beam in separate optical paths extending from said scanner to said bar code, said focus portion comprising first and second focusing energy reflection means respectively disposed to reflect said different half-rectangles of said focusing beam into first parts of said separate optical paths and

3) a scan portion for collecting radiant energy incident on said bar code and applying said collected radiant energy to said detector; and

e) a decoder for decoding said output electrical signals of said detector to provide indication of information contained in said bar code.

33. A bar code scanner for reading a bar code, said bar code scanner having a split beam focusing mechanism, said bar code scanner comprising:

a) a single focusing energy source for generating a focusing beam of a known geometrical shape;

b) a segmenting optical system for splitting the geometrical shape of said focusing beam into at least two beam segments; and

c) a transmitting optical system for recomposing said beam segments at a predetermined distance away from the scanner.

34. A bar code scanner of claim 33, wherein the geometrical shape of said focusing beam is a circle.

35. A bar code scanner of claim 33, wherein the geometrical shape of said focusing beam is a rectangle.