Portable instrument for electro-optically reading indicia and for projecting a bit-mapped color image

• US 6,655,597 B1
• Filed: 06/27/2000
• Issued: 12/02/2003
• Est. Priority Date: 06/27/2000
• Status: Expired due to Term

• Current Assignee: Microvision, Inc.
• Original Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Inventors: Joseph, Eugene, Tan, Chinh, He, Duanfeng, Katz, Joseph, Swartz, Jerome
• Primary Examiner(s): Lee, Diane I.
• Application Number:
  US09/604,197
• Time in Patent Office: 1,253 Days
• Field of Search: 235/462.45, 235/462.43, 235/462.36, 235/462.38, 235/462.48, 235/462.49, 235/469, 235/472.01, 235/472.03, 348/67-70, 348/108, 348/203, 359/443, 359/460
• US Class Current: 235/462.45
• CPC Class Codes: G06K 7/10574 Multiple sources
• CPC Class Codes: G06K 7/10673 Parallel lines
• CPC Class Codes: G06K 7/10772 Moved readers, e.g. pen, wand
• CPC Class Codes: G06K 7/12 using a selected wavelength, e.g. to sense red marks and ignore blue marks

Abstract

A portable instrument incorporates an electro-optical assembly for reading indicia during a reading mode, and for projecting a bit-mapped color image during a display mode. A manually operable switch on the instrument is disposed for selecting one of the modes. The color image is formed by pulsing a plurality of differently colored lasers at selected times on selected scan lines.

Claims

1. An arrangement for displaying a bit-mapped two-dimensional color image for viewing by a human eye on a target, comprising:

a) a plurality of energizable lasers of different wavelengths for projecting respective laser beams toward the target when energized;

b) a scanner for sweeping the laser beams along a plurality of light paths over the target; and

c) a controller operatively connected to, and operative for energizing and deenergizing, the lasers while the laser beams are swept along the light paths, the controller being operative for energizing the lasers at selected positions of the laser beams in at least one of the light paths to illuminate individual light pixels overlapping at the selected positions, and at a refresh rate at which the overlapping pixels persist to enable the eye to steadily view the bit-mapped two-dimensional color image, the controller being operative for deenergizing the lasers at other selected positions of the laser beams in at least one of the light paths to non-illuminate individual light pixels overlapping at the other selected positions, the image being comprised of a light pattern of the overlapping illuminated and non-illuminated pixels on the target.

2. The arrangement of claim 1, wherein the scanner includes a first scan mirror for sweeping the laser beams along a first direction along said at least one of the light paths, and a second scan mirror for sweeping the laser beams along a second direction generally orthogonal to the first direction, and wherein the controller is operative for energizing and de-energizing the lasers as the laser beams are swept along a plurality of each of the light paths.

3. The arrangement of claim 2, wherein the first scan mirror is moved at a first rate of speed through a first angular distance, and wherein the second scan mirror is moved at a second rate of speed slower than said first speed, and wherein the second scan mirror is moved through a second angular distance greater than said first angular distance.

4. The arrangement of claim 1, and further comprising a housing for supporting the lasers, the scanner, and the controller, the housing having a light-transmissive element through which the swept laser beams are directed toward the target.

5. The arrangement of claim 4, wherein the housing has a size and a shape configured to be held in a user'"'"'s hand.

6. The arrangement of claim 5, wherein the housing is elongated and extends between opposite end regions, and wherein the element is located at one of the end regions.

7. The arrangement of claim 5, wherein the housing has a panel having a front surface to which the swept laser beams are projected.

8. The arrangement of claim 7, wherein the panel is mounted on the housing for movement to a display position in which the swept laser beams are incident on the front surface of the panel.

9. The arrangement of claim 1, wherein the controller is operatively connected to a memory having stored fonts and timing data as to when to energize and de-energize the lasers to display the color image as font characters.

10. The arrangement of claim 1, wherein the lasers, the scanner and the controller are mounted on a common support to constitute a module.

11. A method of displaying a bit-mapped two-dimensional color image for viewing by a human eye on a target, comprising the steps of:

a) providing a plurality of energizable lasers at different wavelengths for projecting respective laser beams toward the target;

b) sweeping the laser beams along a plurality of light paths over the target;

c) energizing the lasers at selected positions of the laser beams in at least one of the light paths to illuminate individual light pixels overlapping at the selected positions, and at a refresh rate at which the overlapping pixels persist to enable the eye to steadily view the color image; and

d) deenergizing the lasers at other selected positions of the laser beams in at least one of the light paths to non-illuminate individual light pixels overlapping at the other selected positions, the image being comprised of a light pattern of the overlapping illuminated and non-illuminated pixels on the target.

12. The method of claim 11, wherein the sweeping step is performed by sweeping the laser beams along two mutually orthogonal directions.

13. The method of claim 11, wherein the steps are performed in a housing having a light-transmissive element through which the swept laser beams are directed.

14. The method of claim 13, wherein the swept laser beams are directed at a front surface of a panel mounted on the housing.

15. The method of claim 11, wherein step (c) is performed by displaying font characters.

16. A hand-held, electronic device for displaying a bit-mapped two-dimensional color image, comprising:

a) a housing having a display panel on the housing;

b) a plurality of energizable lasers of different wavelengths in the housing for projecting respective laser beams toward the display panel when energized;

c) a scanner in the housing for sweeping the laser beams along a plurality of light paths over the display panel; and

d) a controller in the housing operatively connected to, and operative for energizing, the lasers at selected positions of the laser beams in at least one of the light paths to generate individual light pixels overlapping at the selected positions on the display panel, and at a refresh rate at which the overlapping pixels persist to enable a human eye to steadily view the color image comprised of a light pattern of the overlapping pixels on the display panel, the display panel being stationary during display of the image.

17. The device of claim 16, wherein the device is a telephone, and wherein the display panel is hinged to the telephone.

18. A wearable, electronic device for displaying a bit-mapped two-dimensional color image, comprising:

a) a wearable housing having a display surface positioned on the housing in front of a human eye;

b) a plurality of energizable lasers of different wavelengths in the housing for projecting respective laser beams toward the display surface when energized;

c) a scanner in the housing for sweeping the laser beams along a plurality of light paths over the display surface; and

d) a controller in the housing operatively connected to, and operative for energizing, the lasers at selected positions of the laser beams in at least one of the light paths to generate individual light pixels overlapping at the selected positions on the display surface, and at a refresh rate at which the overlapping pixels persist to enable the eye to steadily view the color image comprised of a light pattern of the overlapping pixels on the display surface, the display panel being stationary during display of the image.