Infrared data communications

• US 4,977,618 A
• Filed: 04/21/1988
• Issued: 12/11/1990
• Est. Priority Date: 04/21/1988
• Status: Expired due to Fees

• Current Assignee: US Photonics, Inc.
• Original Assignee: US Photonics, Inc.
• Inventors: Allen, Richard C.
• Primary Examiner(s): Orsino, Joseph A.
• Assistant Examiner(s): Van Beek, L.
• Application Number:
  US07/184,261
• Time in Patent Office: 964 Days
• Field of Search: 455/617, 455/603, 455/607, 370/1, 370/3, 370/4
• US Class Current: 398/127
• CPC Class Codes: H04B 10/1149 Arrangements for indoor wireless networking of information
• CPC Class Codes: H04B 10/40 Transceivers

Abstract

The present invention is an apparatus for wireless communications of information between two locations. A transmitter means modulates the information into infrared radiation at a first location. The infrared radiation is transmitted by the transmitter to a reflecting surface along a straight line path which is transparent to the infrared radiation. The infrared radiation is reflected at the reflecting surface forming reflected infrared radiation. A receiver means for receiving the reflected infrared radiation from the reflecting surface is positioned at a second location. The second location and the reflecting surface have a straight line path therebetween which is transparent to the infrared radiation.

Claims

1. An apparatus for transmitting information between components in a communication network within an enclosure having preexisting infrared reflecting characteristics comprising:

a. a plurality of transceivers, each having transmitter means for transmitting information modulated into infrared radiation, receiver means for receiving the infrared radiation, and focusing means for focusing the transmitter means and receiver means onto a target area; and

b. means for positioning the plurality of transceiver means at different locations in said enclosure with the focusing means of the plurality of the transceiver means focused onto the same target area which comprises a small spot of an inner surface of the enclosure which is not modified to alter its infrared reflective characteristics so that more than one network can operate within the enclosure and noise sources within the enclosure can be omitted from the target area.

2. The apparatus according to claim 1 wherein the entire target area is not modified to substantially alter the infrared reflective characteristics.

3. The apparatus according to claim 1 wherein said first transmitter means further comprises:

a. one or more infrared LEDs for forming an infrared radiation signal; and

b. a transmitter lens for passing and focusing said infrared radiation.

4. The apparatus according to claim 1 wherein said first receiver means further comprises:

a. a receiver lens for passing and focusing said infrared radiation; and

b. an infrared receptor for transforming said infrared radiation into an electronic signal.

5. The apparatus according to claim 4 wherein said receptor comprises a PIN diode.

6. The apparatus according to claim 5 wherein the diffuse reflecting surface comprises an acoustical ceiling tile.

7. The apparatus according to claim 1 further comprising a second receiver means positioned at said first location and a second transmitter means positioned at said second location wherein said first transmitter means and said second receiver means are combined into a first transceiver means and said second transmitter and said first receiver are combined into a second transceiver means.

8. The apparatus according to claim 7 wherein each said first transceiver means and said second transceiver each direct infrared radiation to or receives infrared radiation from a position which is approximately the same location on the reflecting surface.

9. The apparatus according to claim 1 wherein the plurality of transceivers is divided into first and second groups with the focusing means of one group focused on a first common area of the inner surface of the enclosure and the focusing means of the other group focused on a second common area of the interior of the enclosure where said enclosure has an unmodified diffusing surface.

10. A communication network for interconnecting a plurality of pieces of computer equipment including computers, computer terminals, printers, and computer peripherals to communicate an electronic signal representing information between said pieces of computer equipment where said network is located within an enclosure, comprising:

a. a diffuse reflecting surface which is not modified to alter its infrared reflective characteristics formed on a small portion of an inner surface of the enclosure for receiving infrared radiation impinging thereon and for reflecting infrared radiation therefrom;

b. a plurality of modulators, a first of said modulators being coupled to a first piece of computer equipment, for modulating a first electronic signal representing information received from said first piece of computer equipment to produce a first modulated electronic signal;

c. a plurality of infrared transmitters, a first of said transmitters being coupled to said first modulator for transforming said first modulated electronic signal into an infrared radiation signal, each of said transmitters having a path transparent to said infrared radiation signal to said reflecting surface where said infrared radiation is diffusely reflected and being focused on the diffuse reflecting surface;

d. a plurality of infrared receivers having a line of sight path from said surface, said receivers being focused to receive the infrared radiation reflected from the diffuse reflecting surface and for forming a second modulated electronic signal;

e. a plurality of demodulators, each of said demodulators coupled to each of said infrared receivers and also coupled to each of said computers, each of said demodulators for receiving said second modulated electronic signal and for demodulating it to form a second electronic signal representing said information; and

f. means for transmitting said second electronic signal to a second piece of computer equipment.

11. The communication medium according to claim 10 wherein each infrared receiver further comprises a lens for focusing said infrared radiation which is reflected.

12. The communication medium according to claim 11 wherein each infrared receiver further comprises a filter for excluding unwanted radiation.

13. The communication medium according to claim 10 wherein each infrared transmitter further comprises a lens for focusing said infrared radiation signal.

14. The apparatus according to claim 10 wherein the plurality of transceivers is divided into first and second groups with the focusing means of the first group focused on said same small portion of the inner surface of the enclosure and the focusing means of the second group focused on a different small portion of the inner surface of the enclosure where said enclosure has an unmodified diffusing surface.

15. A method for transmitting information from a first location to a second location, each of said first location and said second location being within an enclosure comprising:

a. transmitting information modulated into infrared radiation by directing it from said first location directly to a diffuse reflecting surface which is not modified to alter its infrared reflective characteristics positioned at a third location on a small portion of an inner surface of said enclosure along a first straight line path therebetween which is transparent to the infrared radiation; and

b. receiving the infrared radiation at said second location from said reflecting surface along a second straight line path therebetween which is transparent to the infrared radiation by focusing the receiver on the reflecting surface.

16. The method according to claim 15 wherein the step of receiving further comprises:

a. passing and focusing said infrared radiation through a second lens; and

b. transforming said infrared radiation into an electronic signal using an infrared receptor.

17. The method according to claim 16 wherein said receptor comprises a PIN diode.

18. The method according to claim 15 wherein the diffuse reflecting surface comprises a member of the group consisting of an acoustical ceiling tile, plaster, plasterboard or wood.

19. The method according to claim 15 wherein the step of transmitting further comprises:

a. activating one or more infrared LEDs for forming an infrared radiation signal; and

b. passing and focusing said infrared radiation through a first lens.

20. The apparatus according to claim 15 wherein the plurality of transceivers is divided into first and second groups with the focusing means of the first group focused on said same small portion of the inner surface of the enclosure and the focusing means of the second group focused on a different small portion of the inner surface of the enclosure where said enclosure has an unmodified diffusing surface.

21. A method for interconnecting a plurality of pieces of computer equipment including computers, computer terminals, printers and computer peripherals to communicate an electronic signal representing information between said pieces of computer equipment where the pieces of computer equipment are operating within an enclosure, comprising:

a. receiving a first electronic signal from a first piece of computer equipment;

b. modulating said first electronic signal to form a first modulated signal;

c. transforming said first modulated signal into a first infrared radiation signal;

d. focusing said first infrared radiation signal on a diffuse reflecting surface formed on a small portion of an inner surface of the enclosure which is not modified to alter its infrared reflective characteristics;

e. reflecting said first infrared signal from said diffuse reflecting surface forming a reflected infrared radiation signal;

f. focusing said reflected infrared radiation signal onto a receptor forming a focused reflected infrared radiation signal;

g. transforming said focused reflected infrared radiation signal into a second modulated signal;

h. demodulating said second modulated signal into a second electronic signal; and

i. transmitting said second electronic signal to a second piece of computer equipment.

22. The apparatus according to claim 21 wherein the plurality of transceivers is divided into first and second groups with the focusing means of the first group focused on said same small portion of the inner surface of the enclosure and the focusing means of the second group focused on a different small portion of the inner surface of the enclosure where said enclosure has an unmodified diffusing surface.

23. An apparatus for transmitting information between components of a local area network within an enclosure having preexisting infrared reflecting characteristics comprising:

a. a plurality of transceivers, each having transmitter means for transmitting information modulated into infrared radiation, receiver means for receiving the infrared radiation, and focusing means for focusing the transmitter means and receiver means onto a projection area of an inner surface of the enclosure; and

b. means for positioning the plurality of transceiver means at different locations in said enclosure with the focusing means of the plurality of the transceiver means focused onto the same portion of the inner surface of the enclosure forming a target area including all of each projection area comprising of an inner surface of the enclosure for which the target area, as a whole, is not modified to alter its infrared reflective characteristics.