Hand-held bar code scanner with jointly mounted scanning mirrors

• US 5,021,641 A
• Filed: 12/21/1989
• Issued: 06/04/1991
• Est. Priority Date: 02/28/1985
• Status: Expired due to Term

• Current Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Original Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Inventors: Swartz, Jerome, Shepard, Howard M., Darkan, Eric F.
• Primary Examiner(s): Trafton, David
• Application Number:
  US07/454,144
• Time in Patent Office: 530 Days
• Field of Search: 235/467, 235/472, 235/462
• US Class Current: 235/462.36
• CPC Class Codes: G06K 2207/1011 Aiming
• CPC Class Codes: G06K 7/10633 by oscillation
• CPC Class Codes: G06K 7/10881 constructional details of hand-held scanners

Abstract

A portable laser diode scanning head, aimable at each symbol to be read, emits and receives non-readily-visible laser light, and is equipped with a trigger-actuated aiming light arrangement for visually locating and tracking each symbol. A compact laser diode optical train and an optical folded path assembly, as well as an interchangeable component design and an integral window construction for the head also are disclosed.

Claims

1. A hand-held bar code scanning device for reading bar code symbols, comprising:

(a) a laser light source mounted in the hand-held device for generating a light beam, said light beam being directed along a path toward a bar code symbol located exterior of the hand-held device to result in reflected light traveling back to the device;

(b) a scanner in said hand-held device including a moving mirror assembly in said path driven by a motor, said scanner causing said light beam and a field of view for said reflected light to move along a scan line across the bar code symbol;

(c) a sensor mounted in said hand-held device detecting said reflected light via said moving mirror assembly and generating an electrical signal responsive to said reflected light;

(d) wherein said moving mirror assembly includes a curved mirror for focusing said reflected light on said sensor, and a generally-flat scan mirror different from said curved mirror for scanning said light beam along said scan line, and wherein said scan mirror and curved mirror are jointly supported and driven jointly by said motor;

(e) a housing having a gun-like shape with a barrel portion containing said light source, said scanner and said sensor, the housing having a pistol-grip type of handle, said sensor being mounted in said barrel portion forward of said moving mirror assembly.

2. A hand-held bar code scanning device according to claim 1 wherein said path of said reflected light includes a fixed mirror and said moving mirror assembly.

3. A hand-held bar code scanning device according to claim 1 wherein said moving mirror is driven in an oscillating motion by said motor.

4. A hand-held bar code scanning device according to claim 1 including a controller in said device responsive to a trigger switch mounted on said handle to activate said light source and said motor.

5. A hand-held bar code scanning device according to claim 1 in combination with a remotely located receiver for receiving bar code data from said device.

6. A hand-held bar code scanning device according to claim 1 wherein said light source is a laser.

7. A hand-held bar code scanning device according to claim 1 wherein said pistol-grip type of handle is removable from said barrel portion.

8. A hand-held bar code scanning device according to claim 1 wherein said curved mirror and said scan mirror are of one-piece construction.

9. A hand-held bar code scanning device for reading bar code symbols, comprising:

(a) a gun-shaped housing having a barrel portion and a piston-grip type of handle, the forward end of the barrel portion being pointed toward the bar code symbol;

(a) a light source mounted in said housing for generating a light beam, said light beam being directed along a path exiting a forward end of said barrel portion toward a bar code symbol located exterior of the hand-held device resulting in reflected light traveling back to the device;

(b) a scanner in said housing including a moving mirror assembly in said path driven by a motor, said scanner moving said light beam and a field of view for said reflected light along a scan line across the bar code symbol;

(c) a sensor mounted in said hand-held device detecting said reflected light for said scanned field of view via said moving mirror assembly, and generating electrical signals responsive to the reflected light, said sensor being positioned toward said forward end of said barrel portion of said housing with respect to said moving mirror assembly;

(d) a trigger switch located at an upper part of said pistol-grip handle for activating said light source and said motor;

(e) wherein said moving mirror assembly includes a curved mirror for focusing said reflected light on said sensor, and a scan mirror for scanning said light beam along said scan line, and wherein said scan mirror is different from said curved mirror, and said scan mirror and curved mirror are mounted and driven jointly.

10. A hand-held bar code scanning device according to claim 9 wherein said sensor is mounted facing said moving mirror assembly and facing rearward away from said bar code symbol.

11. A hand-held bar code scanning device according to claim 9 wherein said moving mirror assembly is driven in an oscillating motion by said motor.

12. A hand-held bar code scanning device according to claim 9 including a controller in said device responsive to said trigger switch to activate said light source and said motor.

13. A hand-held bar code scanning device according to claim 9 in combination with a remotely located receiver for receiving bar code data from said device.

14. A hand-held bar code scanning device according to claim 9 wherein said light source is a laser.

15. A hand-held bar code scanning device according to claim 9 wherein said flat mirror is smaller than, and mounted on, said curved mirror.

16. A hand-held bar code scanning device according to claim 9 wherein said curved mirror and said flat mirror are of one-piece construction.

17. A method of reading bar code symbols or the like, comprising the steps of:

(a) generating a light beam in a hand-held device and directing said light beam along a path toward a bar code symbol located forward of the hand-held device to result in reflected light traveling back to the hand-held device;

(b) moving said light beam and a field of view for said reflected light along a scan line across the bar code symbol by a scanner in said hand-held device, said scanner including a moving mirror assembly in said path driven by a motor, said moving mirror assembly including a scanning mirror and a collecting mirror mounted together and moving together, said scanning mirror being relatively flat and said collecting mirror being concave;

(c) detecting said reflected light by a sensor mounted in said hand-held device forward of said moving mirror assembly, said reflected light traveling by a path including said collecting mirror of said moving mirror assembly.

18. A method according to claim 17 wherein said moving mirror assembly is driven in an oscillating motion by said motor.

19. A method according to claim 17 wherein said housing includes a pistol-grip type of handle, and including the step of activating said light source and motor by a trigger switch when the housing is pointed toward said indicia by a user.

20. A method according to claim 17 including the step of transmitting electrical signals representing an output of said sensor to a remotely-located data processing system.

21. An optical scanning apparatus including a light source and a light sensor for reading an indicia having parts of different light reflectivity, comprising:

a) a movable optical scanning element for reflecting a light beam from said light source in a path toward said indicia and scanning the light beam in a path across said indicia;

b) a movable, generally-concave optical collecting element for collecting light reflected from said indicia, and for directing said reflected light toward said sensor, said scanning element and said collecting element being mirrors secured to one another to move together; and

c) a motor for jointly and simultaneously moving said scanning and collecting elements.

22. Apparatus according to claim 21 wherein said indicia is a bar code or the like.

23. Apparatus according to claim 21 wherein said light source is a laser.

24. Apparatus according to claim 21 wherein said scanning element is a flat mirror.

25. Apparatus according to claim 21 wherein said motor reciprocally oscillates said scanning and collecting elements.

26. Apparatus according to claim 21 wherein said light source, light sensor, scanning and collecting elements and motor are all contained in a hand-held housing.

27. Apparatus according to claim 26 wherein said housing includes a pistol-grip type of handle, and a trigger switch for activating said light source and motor when the housing is pointed toward said indicia by a user.

28. Apparatus according to claim 26 in combination with a remotely-located data processing system for receiving electrical signals representing an output of said sensor.

29. Apparatus according to claim 21 wherein said motor for moving said elements is an electric motor.

30. A method of reading an indicia having parts of different light reflectivity, comprising the steps of:

a) generating a light beam from a light source;

a) reflecting said light beam by a movable optical scanning mirror in a path from said light source toward said indicia;

b) collecting reflected light from said indicia by a movable, generally-concave optical collecting mirror, and directing said reflected light toward a light sensor; and

c) jointly and simultaneously moving said scanning and collecting mirrors to scan the light beam and a field of view of said reflected light in a path across said indicia, said scanning and collecting mirrors being jointly mounted to move together.

31. A method according to claim 30 wherein said indicia is a bar code or the like.

32. A method according to claim 30 wherein said light source is a laser.

33. A method according to claim 30 wherein said step of moving includes reciprocally oscillating said scanning and collecting mirrors.

34. A method according to claim 30 wherein said light source, light sensor, scanning and collecting mirrors and motor are all contained in a hand-held housing.

35. A method according to claim 34 wherein said housing includes a pistol-grip type of handle, and including the step of activating said light source and motor by a trigger switch when the housing is pointed toward said indicia by a user.

36. A method according to claim 30 including the step of transmitting electrical signals representing an output of said light sensor to a remotely-located data processing system.

37. A lightweight bar code scanning device configured for reading bar code symbols, comprising:

a. a housing;

b. a laser light source supported in the housing for generating a laser beam, said laser beam being directed along a path towards the bar code located exterior to the housing to result in reflected light from the bar code traveling back to the housing;

c. a sensor supported in the housing for receiving said reflected light and generating an electrical signal responsive thereto;

d. a movably supported mirror assembly in said housing, said mirror assembly including (i) a curved collecting mirror for receiving said reflected light and directing it in a path to reach said sensor, and (ii) a scanning mirror for receiving the laser beam from the source and directing it toward the bar code symbols to be read, said scanning and collecting mirrors being supported for joint movement with one another, and

e. a drive mechanism for moving the mirror assembly, thereby to scan the laser beam and the field of view of the sensor across the bar code symbol.

38. The bar code scanning device according to claim 37 wherein the scanning and collecting mirrors are supported one on the other for joint movement.

39. The bar code scanning device according to claim 37 wherein the scanning and collecting mirrors are of one piece construction.

40. The bar code scanning device according to claim 37 wherein the scanning mirror is smaller than the collecting mirror.

41. The bar code scanning device according to claim 37 wherein the scanning mirror is substantially planar.

42. The bar code scanning device according to claim 37 wherein the drive mechanism includes an electric motor.

43. The bar code scanning device according to claim 42 wherein the electric motor has its output shaft coupled to the mirror assembly and wherein said electric motor is operated to reciprocally oscillate its output shaft and the mirror assembly.

44. The bar code scanning device according to claim 37 wherein the housing is configured to be handheld.

45. The bar code scanning device according to claim 44 where the housing is gun-shaped.

46. The lightweight bar code scanning device according to claim 37 and including a trigger switch supported from said housing for allowing energization of said light source.