Emitter assembly for use in an optical traffic preemption system

• US 5,187,373 A
• Filed: 09/06/1991
• Issued: 02/16/1993
• Est. Priority Date: 09/06/1991
• Status: Expired due to Term

• Current Assignee: Global Traffic Technologies LLC (Vontier Corp.)
• Original Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Inventors: Gregori, George A.
• Primary Examiner(s): Nelms, David C.
• Assistant Examiner(s): ALLEN, STEPHONE B
• Application Number:
  US07/756,321
• Time in Patent Office: 529 Days
• Field of Search: 250/551, 340/471, 340/472, 340/906, 340/907, 359/354-356, 359/127, 359/129, 359/130, 359/131, 359/641
• US Class Current: 250/551
• CPC Class Codes: G08G 1/087 Override of traffic control, e.g. by signal transmitted by an emergency vehicle

Abstract

An optical signal emitter assembly emits light pulses which are received by an optical traffic preemption system detector. The optical signal emitter assembly employs a honeycomb element positioned in front of a light source which collimates light emitted by the optical signal emitter assembly. The optical signal emitter assembly is convertible from a stand-alone unit containing power supply circuitry, timing circuitry, and a light source in a single housing, to a unit wherein the light source can be mounted independently from a housing containing the power supply circuitry and the timing circuitry.

Claims

1. An optical signal emitter assembly for remotely controlling traffic signal lights and adapted to be affixed to an authorized vehicle, the optical emitter assembly comprising:

a housing;

a light source for converting a supply voltage into a power signal capable of activating the light source;

timing means coupled to the power supply and the light source, for controlling the repetition rate and duration of light pulses; and

collimating means including a honeycomb element having a plurality of cells, with each cell having an opening that extends form a front through to a rear of the cell, said element being positioned in front of the light source, for collimating the light pulses emitted by the light source thereby resulting in a pulsed light beam capable of activating a first photodetector channel coupled to the traffic signal lights to be controlled, while not activating other photodetector channels proximate to the first photodetector channel, but coupled to other traffic signal lights which are not to be controlled.

2. The optical signal emitter assembly of claim 1 and further comprising a lens positioned in front of the collimating means.

3. The optical signal emitter assembly of claim 2 wherein the lens is formed from a material that is transparent to visible and infra-red light.

4. The optical signal emitter assembly of claim 2 wherein the lens is formed from a material that is opaque to visible light and transparent to infra-red light.

5. The optical signal emitter assembly of claim 1 wherein a longest distance across the opening of a cell is approximately 0.25 inches and a distance between the front and the rear of a cell is approximately 0.375 inches.

6. The optical signal emitter assembly of claim 5 wherein the pulsed light beam is generally non-divergent at distances greater that 500 feet from the optical signal emitter assembly.

7. The optical signal emitter assembly of claim 1 wherein the honeycomb element is formed from aluminum.

8. The optical signal emitter assembly of claim 1 wherein surfaces of the honeycomb element are formed from a material which absorbs visible and infra-red light.

9. The optical signal emitter assembly of claim 1 wherein surfaces of the honeycomb element are formed form a material which reflects visible and infra-red light, thereby scattering the light and resulting in the pulsed light beam having an arc of divergence of approximately 160 degrees at distances less than 300 feet from the optical signal emitter assembly.

10. The optical signal emitter assembly of claim 1 and further comprising a window positioned in front of the collimating means, the window having the shape of a circle with the top and bottom of the circle truncated.

11. An optical signal emitter assembly for remotely controlling traffic signal lights and adapted to be affixed to an authorized vehicle, the optical emitter assembly comprising:

a housing having first joining means;

a front bezel having second joining means, wherein the second joining means is adapted to be joined with the first joining means;

electrical connection means for connecting components in the housing with components in the front bezel;

a light source positioned in the front bezel, for emitting light pulses;

a power supply for converting a supply voltage into a power signal capable of activating the light source;

timing means coupled to the power supply and the light source, for controlling the repetition rate and duration of light pulses; and

collimating means including a honeycomb element having a plurality of cells, with each cell having an opening that extends from a front through to a rear of the cell, said element being positioned in the front bezel and in front of the light source, for collimating the light pulses emitted by the light source thereby resulting in a pulsed light beam capable of activating a first photodetector channel coupled to the traffic signal lights to be controlled, while not activating other photodetector channels proximate to the first photodetector channel, but coupled to other traffic signal lights which are not to be controlled.

12. The optical signal emitter assembly of claim 11 wherein the power supply is positioned in the housing.

13. The optical signal emitter assembly of claim 11 wherein heat sensitive components of the power supply are positioned in the front bezel, and a remainder of power supply components are positioned in the housing.

14. The optical signal emitter assembly of claim 11 wherein the timing means is positioned in the housing.

15. The optical signal emitter assembly of claim 11 and further comprising a lens positioned in front of the collimating means.

16. The optical signal emitter assembly of claim 11 and further comprising mounting means coupled to the housing, for mounting the housing to a vehicle.

17. The optical signal emitter assembly of claim 11 wherein the first joining means is joined with the second joining means.

18. The optical signal emitter assembly of claim 11 and further comprising:

conversion means for allowing the housing to be mounted separately from the front bezel, the conversion means comprising;

a housing cover having third joining means, wherein the third joining means is joined with the first joining means; and

a front bezel base having fourth joining means, wherein the second joining means is joined with the fourth joining means.

19. The optical signal emitter assembly of claim 18 wherein the bracket spacer has a hole through which the electrical connection means passes.

20. The optical signal emitter assembly of claim 18 wherein the front bezel is located on an exterior of a vehicle, the housing is located at another location of the vehicle and the connection means is of sufficient length to connect the housing to the front bezel.

21. The optical signal emitter assembly of c)aim 18 and further comprising mounting means coupled to the front bezel base, for mounting the front bezel base to a vehicle.