Infrared network transceiver apparatus

• US 5,191,461 A
• Filed: 05/16/1991
• Issued: 03/02/1993
• Est. Priority Date: 11/14/1988
• Status: Expired due to Fees

• Current Assignee: US Photonics, Inc.
• Original Assignee: US Photonics, Inc.
• Inventors: Sacherman, James E., Cranshaw, Charles L., Toor, John W., Piccone, John, Allen, Richard C.
• Primary Examiner(s): Coles, Sr., Edward L.
• Assistant Examiner(s): NEGASH, KINFE MICHAEL
• Application Number:
  US07/702,448
• Time in Patent Office: 656 Days
• Field of Search: 455/603-604, 455/606-607, 455/613, 455/617, 455/618, 362/227, 362/234, 362/252, 362/296, 362/301, 359/154, 359/152, 359/142, 359/159, 359/169, 359/170, 359/172, 359/833, 359/118, 250/552
• US Class Current: 398/131
• CPC Class Codes: H04B 10/50 Transmitters

Abstract

The present invention is for an illumination transmitter. The transmitter projects a signal onto a planar reflective surface such as the ceiling of an open office environment. The transmitter includes a plurality of illumination sources positioned in a line wherein the line has a predetermined orientation to the planar surface. The illumination sources are preferably infrared LEDs. The transmitter has means for jointly aiming the illumination sources toward a desired location on the planar surface. The location on the planar surface is usually used to allow multiple transmitters coupled to infrared receivers to allow communication between computers in a LAN. The transmitter also includes means for maintaining the predetermined orientation between the planar surface and the line. The orientation is usually parallel to allow transmitters located large distances from the illumination to project a relatively small illumination spot onto the planar surface.

Claims

1. An illumination transmitter for projecting a signal onto a planar reflective surface comprising:

a. a plurality of illumination sources positioned in a line having a substantially parallel orientation to the planar surface;

b. means for jointly aiming the illumination sources at an acute angle toward a desired location on the planar surface while maintaining the substantially parallel orientation between the planar surface and the line so that a collective projection image is formed by the illumination sources on the planar surface which is substantially an isosceles trapezoid having a base and wherein the line is substantially parallel to the base.

2. The transmitter according to claim 1 wherein the signal is an infrared signal.

3. The transmitter according to claim 2 wherein the illumination sources are light emitting diodes.

4. The transmitter according to claim 1 further comprising a clamping means for mounting the transmitter to a wall.

5. The transmitter according to claim 4 wherein the clamping means also serves to house electronic circuitry.

6. The transmitter according to claim 1 wherein the means for aiming comprises a means for rotating the line about an axis which is normal to the planar surface and a means for tilting the line about its longitudinal axis.

7. The transmitter according to claim 6 wherein the means for rotating comprises a circular bearing.

8. The transmitter according to claim 6 wherein the means for tilting comprises a hinge.

9. An apparatus for transmitting information between components in a communication network within an enclosure having at least one diffuse planar reflection surface, comprising:

a. a plurality of illumination sources arranged in a substantially linear arrangement;

b. means for jointly aiming the sources at a location on the reflection surface, wherein the linear arrangement of the sources is maintained in a substantially parallel relationship to the planar surface, and wherein a beam emanating from the sources forms an acute angle with the reflection surface such that a projection image is formed on the reflection surface which is substantially an isosceles trapezoid; and

c. at least one illumination receiver aimed at the location on the reflection surface.