Linked scanner imaging system and method

• US 6,583,772 B1
• Filed: 08/05/1998
• Issued: 06/24/2003
• Est. Priority Date: 08/05/1998
• Status: Expired due to Term

• Current Assignee: Microvision, Inc.
• Original Assignee: Microvision, Inc.
• Inventors: Tegreene, Clarence T., Lewis, John R., Melville, Charles D.
• Primary Examiner(s): Hjerpe, Richard
• Assistant Examiner(s): Eisen, Alexander
• Application Number:
  US09/129,739
• Time in Patent Office: 1,784 Days
• Field of Search: 345/7-9, 348/53, 348/54, 359/196-199, 359/201, 359/202, 359/212-214, 359/223-225, 359/13, 359/629-633, 359/169, 359/170, 359/143, 349/11, 358/408, 358/409, 358/474, 382/321, 382/323
• US Class Current: 345/7
• CPC Class Codes: G02B 27/017 Head mounted

Abstract

A device for image transmission includes a first scanner at a first location and a second scanner at a second location, with an optical fiber linking the scanners. The first scanner scans the first location and couples light from the first location to the optical fiber. The fiber transmits the light to the second location where the second scanner constructs an image of the second location from the light. The two scanners are synchronized so that the constructed image corresponds directly to the scanned scene. The second scanner may be part of a retinal scanner, so that the image is formed directly on the user'"'"'s retina. In another embodiment, the each of the scanners acts as a transceiver so that imaging is bi-directional.

Claims

1. A method of producing an image for viewing by a user, comprising the steps of:

acquiring light from a first location by optically scanning the first location in a selected pattern at a first rate;

transmitting the acquired light to a second location remote from the first location;

at the second location, constructing the image by scanning the transmitted acquired light at a second rate substantially synchronously with the first rate;

generating a synch signal indicative of a scanning orientation in the first location;

transmitting the synch signal from the first location to the second location; and

scanning the transmitted acquired light at a second rate substantially synchronously with the first rate includes driving a second scanner with the synch signal.

2. The method of claim 1 wherein the step of acquiring light from a first scene by optically scanning the first scene in a selected pattern at a first rate includes scanning in a substantially raster pattern.

3. The method of claim 1 wherein the step of constructing the image by scanning the transmitted acquired light at a second rate substantially synchronously with the first rate includes scanning the transmitted acquired light onto a viewer'"'"'s retina.

4. A method of producing an image for viewing by a user, comprising the steps of:

acquiring light from a first location by optically scanning the first location in a selected pattern at a first rate;

transmitting the acquired light to a second location remote from the first location;

at the second location, constructing the image by scanning the transmitted acquired light at a second rate substantially synchronously with the first rate;

generating a synch signal indicative of a scanning orientation in the first location;

transmitting the synch signal from the first location to the second location; and

scanning the transmitted acquired light at a second rate substantially synchronously with the first rate includes

adjusting a scanning frequency of an output scanner in response to the synch signal; and

scanning the transmitted acquired light with the output scanner.

5. The method of claim 4 wherein the step of acquiring light from a first scene by optically scanning the first scene in a selected pattern at a first rate includes scanning in a substantially raster pattern.

6. The method of claim 4 wherein the step of constructing the image by scanning the transmitted acquired light at a second rate substantially synchronously with the first rate includes scanning the transmitted acquired light onto a viewer'"'"'s retina.

7. A method of producing an image of a remote location for viewing by a user, comprising the steps of:

receiving light from the remote location with a first scanner;

transmitting the received light to a second location separate from the remote location;

outputting the transmitted received light from a local end of the optical fiber;

constructing the image from the transmitted received light, and illuminating the remote location;

wherein the step of transmitting the received light to a second location separate from the remote location includes the steps of;

coupling the received light into an optical fiber at the remote location at a remote end of the optical fiber opposite the local end of the optical fiber; and

transmitting the coupled light to the second location with the optical fiber; and

wherein the step of illuminating the remote location includes the steps of;

coupling input light into the optical fiber at a third location along the fiber between the remote and local ends;

transmitting the input light to the remote location with the optical fiber; and

scanning the transmitted light into the remote location.

8. The method of claim 7 wherein the third location is different from the first and second locations.

9. An apparatus for remotely viewing an image, comprising:

a first scanner, having a first light input alignable to the image and a first light output, the first scanner being configured to capture light from the image when the first light input is aligned to the image, the first scanner having a first natural frequency of oscillation that varies within an expected frequency range in response to an expected range of environmental conditions;

a second scanner having a second light input and a second light output, the second scanner being configured to construct a virtual image at the second light output from light received at the second light input; and

an optical fiber coupled to the first scanner and extending from the first light output to the second light input,

wherein the second scanner is a tunable scanner having an adjustable scanning rate, that encompasses the expected frequency range.

10. The apparatus of claim 9 wherein the first scanner has a first field of view having a first angular size and the second scanner has a second field of view different from the first field of view having a second angular size different from the first angular size.

11. The apparatus of claim 10 wherein the second angular size is greater than the first angular size.

12. A remote viewing apparatus, comprising:

a first scanner having an optical input aligned with a viewing field and an output optical port, the first scanner being configured to scan the viewing field and to transmit light from the viewing field to the output optical port;

a second scanner having an optical output and an optical input port, the second scanner being operative to transmit light received at the optical input port to the optical input and to scan the light transmitted light through a two dimensional pattern substantially synchronously with the scanning of the first scanner; and

an optical fiber coupled between the output port of the first scanner and the input port of the second scanner;

wherein the second scanner includes a tuning assembly operative to adjust the scanning rate of the second scanner;

further comprising a scanning monitor coupled to the first scanner, the scanning monitor having a signal output and being operative to produce an output signal at the signal output indicative of the scanning rate of the first scanner, wherein the tuning assembly includes a signal input coupled to the signal output; and

wherein the tuning assembly is responsive to the output signal to adjust the scanning rate of the second scanner.

13. An apparatus for transmitting images bidirectionally, comprising:

a first scanner operative to scan light at a selected scanning frequency, the first scanner being optically aligned to a first environment;

a second scanner operative to scan light at the selected frequency, the second scanner being optically aligned to a second environment physically separated from the first environment; and

an optical transmission fiber having a first end optically coupled to the first scanner and a second end optically coupled to the second scanner;

a light emitter operative to produce illuminating light; and

a second optical fiber extending between the light emitter and the second scanner, the second optical fiber having a first end optically coupled to the light emitter and a second end optically coupled to the second scanner.

14. The apparatus of claim 13 wherein the first scanner is a resonant device having a resonant frequency equal to the selected frequency.

15. The apparatus of claim 13 wherein one of the first and second scanners has a tunable frequency.

16. The apparatus of claim 13 further comprising:

an output port; and

a beam splitter at the first end, the beam splitter being aligned to receive light from the optical transmission fiber, the beam splitter being configured to redirect a portion of light received from the transmission fiber to the output port.

20. The apparatus of claim 13 further comprising a photodetector aligned to receive light from the second scanner and operative to produce an electrical signal indicative of the received light.

21. The apparatus of claim 20 further comprising a display coupled to the photodetector to receive the electrical signal indicative of the received light, the display being operative to produce a video image corresponding to the electrical signal indicative of the received redirected light.

17. An apparatus for transmitting images bidirectionally, comprising:

a first scanner operative to scan light at a selected scanning frequency, the first scanner being optically aligned to a first environment;

a second scanner operative to scan light at the selected frequency, the second scanner being optically aligned to a second environment physically separated from the first environment; and

an optical transmission fiber having a first end optically coupled to the first scanner and a second end optically coupled to the second scanner;

an output port;

a beam splitter at the first end, the beam splitter being aligned to receive light from the optical transmission fiber, the beam splitter being configured to redirect a portion of light received from the transmission fiber to the output port; and

eye coupling optics aligned to receive the redirected light from the output port.

18. An apparatus for transmitting images bidirectionally, comprising:

a first scanner operative to scan light at a selected scanning frequency, the first scanner being optically aligned to a first environment;

a second scanner operative to scan light at the selected frequency, the second scanner being optically aligned to a second environment physically separated from the first environment;

an optical transmission fiber having a first end optically coupled to the first scanner and a second end optically coupled to the second scanner;

an output port;

a beam splitter at the first end, the beam splitter being aligned to receive light from the optical transmission fiber, the beam splitter being configured to redirect a portion of light received from the transmission fiber to the output port; and

coupling optics aligned to receive the redirected light from the output port and operative to produce an output beam from the redirected received light onto a photosensitive print medium.

19. The apparatus of claim 18 wherein the photosensitive print medium is a photographic film.

22. An optical viewing apparatus, comprising:

a first scanner having a first input port and a first output port, the first scanner operative to sweep through a first angular range along a first predetermined scan pattern; and

a second scanner having a second input port and a second output port, the second scanner operative to sweep through a second angular range along a second predetermined scan pattern, the second input port being optically coupled to the first output port, wherein one of the first and second angular ranges is variable;

wherein the second scanner includes an electrical input, and wherein the second scanner is responsive to an electrical signal at the electrical input to vary the second angular range; and

wherein the second scanner is tunable over a selected range of frequencies to slave to the first scanner.

23. The apparatus of claim 22 wherein the first scanner includes an electrical input, and wherein the first scanner is responsive to an electrical signal at the electrical input to vary the first angular range.

24. The apparatus of claim 22 wherein the first scanner is a resonant scanner.