GB1567306A - Light activated control system - Google Patents
Light activated control system Download PDFInfo
- Publication number
- GB1567306A GB1567306A GB19376A GB19376A GB1567306A GB 1567306 A GB1567306 A GB 1567306A GB 19376 A GB19376 A GB 19376A GB 19376 A GB19376 A GB 19376A GB 1567306 A GB1567306 A GB 1567306A
- Authority
- GB
- United Kingdom
- Prior art keywords
- vehicle
- light
- control system
- comparator
- warning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/0017—Devices integrating an element dedicated to another function
- B60Q1/0023—Devices integrating an element dedicated to another function the element being a sensor, e.g. distance sensor, camera
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
- B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
- B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
- B60Q1/1415—Dimming circuits
- B60Q1/1423—Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
- B60Q1/26—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
- B60Q1/48—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for parking purposes
- B60Q1/486—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic for parking purposes for indicating that vehicle is in a parked state
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
- B60Q2300/05—Special features for controlling or switching of the light beam
- B60Q2300/052—Switching delay, i.e. the beam is not switched or changed instantaneously upon occurrence of a condition change
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
- B60Q2300/30—Indexing codes relating to the vehicle environment
- B60Q2300/31—Atmospheric conditions
- B60Q2300/314—Ambient light
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
- B60Q2300/30—Indexing codes relating to the vehicle environment
- B60Q2300/33—Driving situation
- B60Q2300/332—Driving situation on city roads
- B60Q2300/3321—Detection of streetlights
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
- B60Q2300/40—Indexing codes relating to other road users or special conditions
- B60Q2300/41—Indexing codes relating to other road users or special conditions preceding vehicle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
- B60Q2300/40—Indexing codes relating to other road users or special conditions
- B60Q2300/42—Indexing codes relating to other road users or special conditions oncoming vehicle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
- B60Q2300/40—Indexing codes relating to other road users or special conditions
- B60Q2300/43—Indexing codes relating to other road users or special conditions following vehicle
Description
(54) LIGHT ACTIVATED CONTROL SYSTEM
(71) I, GRAHAM CHIVERS, a British subject, of 29 Higher Audley Avenue,
Torre, Torquay, Devon, do hereby declare the invention, for which I pray that a patent may be granted to me, and the method by which it is to be performed, to be particularly described in and by the following statement: The present invention relates to a light activated control system, particularly, but not exclusively, for use in vehicles to control a warning device.
At present there is no legal obligation in the United Kingdom to provide warning lights for vehicles parked at night in builtup areas, despite the fact that street lighting, especially in minor roads, is often insufficient and visibility is often reduced tem
porarily, even in major roads, by, for example, bad weather conditions or head light glare from oncoming vehicles. This results in a number of accidents due to vehicles colliding at night with unlit parked vehicles.
At present vehicle owners are reluctant to light parked vehicles overnight since the only effective method is to leave the sidelights on, with consequent drain on the battery. An object of the present invention is to provide a light activated control system which will operate a warning device, such as the sidelights of a stationary vehicle, only in response to a change in light level, for example due to the light from headlights of an approaching vehicle.
According to the present invention there is provided a vehicle-mounted light activated control system comprising photo-electric ambient visible light sensing means, a comparator circuit having a first input connected to said sensing means and a second input connected to a reference voltage level, a capacitive shunt connected to the first comparator input to exclude from said input transient signals from said sensing means due to rapid changes in ambient light level at alternating current mains frequency and higher frequencies, and switch means connected to an output of the comparator circuit for switching on parking or other external lamps of the vehicle when tripped by the comparator circuit in response to a change in the first input corresponding to the detection of the lights of an approaching vehicle by the photoelectric sensing means.
In use of the invention to control the lights on a parked vehicle at night the light sensing means may include a sensor or sensors at the rear of the vehicle, the control system being connected to operate the tail lights,, brake lights, parking lights, and/or the front side lights of the vehicle. Preferably a further sensor is provided which can be located at the front of the vehicle and which will trigger the control system independently of the rear sensor or sensors provided the light on each sensor is sufficient to trip the comparator circuit.
The reference level of the comparator is preferably set substantially at that light level below which lights are required for moving vehicles. In operation of the control system, when the ambient light intensity falls below this level, the vehicle's warning lights will remain switched off. If, thereafter, a lighted moving vehicle approaches the parked ve hicle and the light falling on one of the sensors is such as to trip the comparator circuit the switch means will switch on the warning lights.
In a preferred embodiment of the invention the comparator provides a triggering output for operation of a time delay device when the said output signal has a predetermined relationship to the reference voltage level, the time delay device, when triggered, operating the switching means for a predetermined time interval. The predetermined time interval is preferably of the order of ten seconds, which is sufficient for a vehicle moving at 30 miles per hour from a position sufficiently close to the parked vehicle for its headlights to activate the control system, to pass the parked vehicle. At the end of the predetermined time interval the vehicle lights will automatically be switched off, to. be reactivated when another lighted moving vehicle passes the parked vehicle.Even if an approaching vehicle stops near the parked vehicles, with its headlights playing on a sensor, the warning lights will go off after the predetermined time interval and will not be reactivated while the headlights remain on as the control circuit is triggered only by a change in light intensity. The parked vehicle should by then have been noticed and the danger of accidental collision avoided.
The control system will also remain inactive if street lights which give sufficient illumination to raise the ambient light level above a threshold level corresponding to the said reference level are switched on. Should the street lights later be switched off, as is common at about 1 a.m. in minor streets, the control system will then be available to switch on the vehicle lights necessary.
Clearly the use of a system according to the invention should ensure that the vehicle lights are switched on at times when they are required, and not for the major part of the night or in well lit areas. Depending on the time interval used, the lights may for example operate for between ten and thirty minutes a night (corresponding to the passage of say sixty to one hundred and eighty cars) which, even considering the additional drain on the battery due to repeated switching of the circuit, should result in a considerable saving of energy over continuous use of the lights for between six and twelve hours.
The present control system offers a further advantage over the continuous illumination of the vehicle lights as it has been found that flashing lights are more noticeable to the human brain than continuous lights. The switching on of the vehicle lights on the approach of a motorist thus draws greater attention to the presence of the parked vehicle than would a continuous light. Attention could be further maintained by including a flasher unit in the control system for connection to the vehicle lights, or by connecting the control circuit to a hazard light flasher unit already installed in the vehicle.
In the absence of any modification, a control system according to the invention would operate to switch on the vehicle lights, upon any increase in the ambient light intensity through, for example, due to the rising of the sun at dawn. As explained above with reference to street lighting, the warning device preferably operates only for a predetermined time interval and thereafter, provided the light level remains above the threshold level, the warning device will not be reactivated even on the approach of a lighted vehicle. Should the light level again fall below the threshold level, however, due for example to heavy cloud, the vehicle lights will operate as described above. The system is therefore automatically rendered inoperative when the ambient light level exceeds the threshold level.Since the control system will activate the vehicle lights only when required, that is, after nightfall, it may be connected to operate permanently, although a master control switch for the circuit may be provided on the dashboard of the vehicle.
In alternative embodiments of the invention, however, control means are provided to prevent triggering of the control circuit in daylight. For example, a further sensor may be provided which is either arranged, in use, to receive light only from the sky, or is sensitive specifically to ultra violet light and is operative to prevent triggering of the control circuit due to an increase in the ambient light level, or specifically of the ultra violet light intensity, respectively, through a respective predetermined level. Alternatively the control means may comprise a circuit operative to detect the rate of increase in light level and to prevent triggering of the warning device unless the rate is greater than a predetermined rate.This predetermined rate would be substantially greater than the rate of increase occurring at sunrise but less than that produced by the approach of a slow moving, lighted vehicle.
An additional use of a control system according to the invention would be to operate a dashboard-mounted lamp, or a buzzer located within a vehicle, to provide a warning to the vehicle drive of the desirability of using lights. The system could be set to operate at the same threshold level as the system descdribed above, to be triggered by the lights of approaching vehicles or by street lighting, and it could be arranged to operate only when the lights of the vehicle carrying the system were switched off. No additional warning lamps or buzzers need be provided if the system is arranged to operate the existing lamps in the instrument panel of the vehicle.
In one embodiment of the invention the switch means are operated in response to an increase in the sensed light intensity through a predetermined threshold level at a rate greater than a predetermined rate, the switch means being maintained closed as long as the sensed light intensity increases at a rate greater than the said predetermined rate.
This embodiment of the control system switches on the parking or other warning lights on a parked vehicle on the approach of another vehicle and will continue to operate the lights while the vehicle continues to approach. It will however switch the warning lights off if the vehicle stops, or when it passes the parked vehicle. The predetermined rate may conveniently be arranged to be greater than that produced by the sun at dawn.
One embodiment of the invention will now be more particularly described, by way of example, with reference to the accompanying diagrammatic drawings, in which:
Figure 1 is a circuit diagram of a control system according to the invention; and
Figure 2 is a sectional view of a lamp unit fitted with the control system of Figure 1.
Referring to the drawings, the illustrated light-activated control system for a warning device includes an electronic control circuit, generally indicated 1, the major part of which is carried on a printed circuit board 2 which is shown in Figure 2 fitted in a lamp unit 3 adapted to be mounted on a vehicle.
The circuit board 2 is mounted within a housing 4 and behind a reflector 5 of the lamp unit 3. A photocell 6 forming part of the control system is attached to the rear face of a lens 7 of the lamp unit 3.
Referring to Figure 1 the photocell 6, which in this example is a photoresistive element, forms with a resistor Rl part of a potential divider connected across a D.C.
supply, in this case the vehicle battery (12 volts). The junction of the photocell 6 and resistor R1 is connected to a first input of a comparator 8. A second input of the comparator 8 is connected to a further potential divider, constituted by a resistor VR1 and a resistor R2 connected in series across the
D.C. supply, and arranged to provide a reference input level. The resistor VRl shown is a variable resistor but it may alternatively be a fixed resistor.
The comparator 8 is an operational amplifier, formed by an integrated circuit type 741, which acts as a Schmitt trigger. Thus (he comparator 8 provides a steady output voltage at a positive level when the voltage at the first input, derived from the photocell 6, is less than the reference input level, and a steady output voltage at a negative level when the voltage at the first input exceeds the reference input level. The variable resistor VRl is adjusted so that the reference input level balances the first input to the comparator 8 when the photocell 6 is illuminated by a light intensity at a predetermined threshold level.
A capacitor Cl is connected across the resistor Rl to remove from the first comparator input transient signals resulting from intermittent illumination of the photocell 6 by, for example, lightning flashes or alternating current fluorescent lighting.
The output from the comparator 8 is passed through a capacitor C2 which acts to block direct current to a monostable 9, constituted by an integrated circuit type 555.
The monostble 9 receives an input pulse each time the first input to the comparator 8 passes through the reference level, a negative pulse being received each time the light intensity at the photocell 6 increases through the threshold level, and a positive pulse being received each time the said light level falls through the threshold level.
The monostable 9 responds only to negative pulses, that is pulses due to the output from the comparator 8 changing from positive to negative as a result of an increase in the sensed light intensity through the threshold level. A resistor R3 provides a positive bias voltage at the monostable input to prevent a negative direct current voltage leaking through capacitor C2 and activating the monostable 9 continuously.
The monostable 9 is connected to a timing circuit comprising a resistor R4 and capacitor C3 connected in series across the power supply, the time constant of the circuit R4, C3 determining the interval timed by the monostable 9, that is, the interval between the triggering of the monostable and its reversion to its stable state. The output from the monostable 9 is fed through a resistor R5 which acts as a current limiter to the base of a transistor T1 which acts as an inverter. The transistor Tl controls a switching transistor T2 through a current limiting resistor R6. The collector of the transistor
T2 is connected to a warning device 10, in this case constituted by a lamp bulb 11 in the lamp unit 3.
The circuit of Figure 1 is designed for use with a vehicle having a negative earth or chassis. In the case of a vehicle having a positive earth or chassis the inverter stage
Tl would be omitted: to prevent rapid current surges, which could damage the bulb 11 a damping capacitor may be connected between the base of the transistor Tl and earth.
The arrangement described with reference to Figures 1 and 2 is a self-contained unit which is responsive to increases in the illumination of the photocell 6 through a threshold level to switch on the lamp bulb 11. This unit may be mounted on a convenient part of a vehicle and connected to the vehicle battery.
In an alternative installation, the lamp unit may comprise a side, head or tail light unit of a vehicle. Alternatively, the control circuit itself may be fitted to a vehicle to switch on existing side, head and tail lights in response to light sensed by a photocell mounted externally. Two or more light-sensing photocells may be connected in parallel to the input of the control circuit, the photocells being positioned on different parts of the vehicle, for example at the front and rear. Thus in Figure 1 a further photocell 12 is shown connected by broken lines in parallel with the photocell 6.
In use of the control system the variable resistor VRl is first set as described earlier to predetermine the threshold light level for operations of the system.
In operation, light falling on the photocell 6 decreases its resistance, increasing the input voltage at the first input (negative input terminal) of the comparator 8. When this voltage increases from a lower value to equal and then exceed the reference voltage level determined by resistor VRl, the output of the comparator 8 changes from positive to negative and triggers the monostable 9.
The monostable 9, through the transistors T1 and T2, switches on the warning device 10, for example the bulb 11, for the period predetermined by the timing circuit constituted by the resistor R4 and capacitor C3.
The warning device remains switched on for the full length of the predetermined period, typically ten seconds, irrespective of whether or not the photocell 6 continues to receive the increased light intensity which triggered the system. At the end of this period the monostable 9 reverts to its stable state and switches the warning device 10 off.
When the light intensity received by the photocell 6 drops from a higher to a lower level, through the threshold level at which the input voltages to the input terminals of the comparator 8 are the same, the monostable 9, being positively biased, is not triggered and the warning device is not switched on.
As an alternative, or in addition to the warning lamp 11, the warning device 10 may comprise, as shown diagrammatically in
Figure 1, the vehicle head and tail (or brake) lamps 14, and possibly also an energising circuit for a buzzer 15 and dashboard warning lamp 16 which may comprise the lamp of the vehicle instrument panel. It may be arranged that the buzzer 15 and warning lamp 16 are not energised if the vehicle lamps 14 are already switched on by closure of a dashboard switch 17. Such an arrangement would provide the driver of the vehicle with a warning if he were driving at night without the vehicle lights switched on.
The control system may also include a normally open relay switch 13 which is energised when the monostable 9 is triggered to complete a power supply circuit for a flasher unit 18, shown in broken outline, which may be incorporated in the circuit. The flasher unit 18 may be arranged to switch vehicle hazard warning lights on and off periodically. The hazard warning lights would usually be constituted by the direction indicator lights of the vehicle.
A resistor R7 and capacitor C4 are provided in the control circuit 1 to provide alternating current decoupling for any variation in current in the circuit due, for example, to the operation of the flasher unit 18 or the pulsed current to an electric clock.
The bulb 11 particularly for use with commercial vehicles, may be a forty Watt bulb providing much greater illumination than is usual for motor vehicles.
WHAT WE CLAIM IS:- 1. A vehicle-mounted light-activated control system comprising photo-electric ambient visible light sensing means, a comparator circuit having a first input connected to said sensing means and a second input connected to a reference voltage level, a capacitive shunt connected to the first comparator input to exclude from said input transient signals from said sensing means due to rapid changes in ambient light level at alternating current mains frequency and higher frequencies, and switch means connected to an output of the comparator circuit for switching on parking or other external lamps of the vehicle when tripped by the comparator circuit in response to a change in the first input corresponding to the detection of the lights of an approaching vehicle by the photoelectric sensing means.
2. A light-activated control system according to Claim 1, in which the comparator provides a triggering output for operation of a time delay device when the said output signal has a predetermined relationship to the reference voltage level, the time delay device, when triggered, operating the switching means for a predetermined time interval.
3. A light-activated control system according to Claim 2, in which the comparator includes a Schmitt trigger.
4. A light-activated control system according to Claim 2 or Claim 3, in which the time delay device includes a monostable.
5. A light-activated control system according to Claim 2, Claim 3 or Claim 4, in which the predetermined time interval is of the order of ten seconds.
6. A light-activated control system according to any preceding Claim, in which the switch means comprises a relay switch controlling the operation of a warning device in addition to the vehicle lamps.
7. A light-activated control system according to any preceding Claim, in which the switch means control the operation of a flasher unit connected to the said vehicle
lamps for intermittent energisation thereof upon operation of the switch means.
8. A light-activated control system according to any preceding Claims, in which the light sensing means comprise at least one photo-resistive element.
9. A light-activated control system according to any preceding Claim, in which the switch means are inoperative in response to increase in the light intensity sensed by the sensing means due to sunrise.
10. A vehicle fitted with a control system according to any one of the preceding claims, in which the photoelectric light sensing means comprise photo-sensitive elements mounted at the front and rear of the vehicle and connected to the comparator circuit.
11. A vehicle according to Claim 10 in which the switch means are connected to front and rear mounted lamps on the vehicle
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (13)
1. A vehicle-mounted light-activated control system comprising photo-electric ambient visible light sensing means, a comparator circuit having a first input connected to said sensing means and a second input connected to a reference voltage level, a capacitive shunt connected to the first comparator input to exclude from said input transient signals from said sensing means due to rapid changes in ambient light level at alternating current mains frequency and higher frequencies, and switch means connected to an output of the comparator circuit for switching on parking or other external lamps of the vehicle when tripped by the comparator circuit in response to a change in the first input corresponding to the detection of the lights of an approaching vehicle by the photoelectric sensing means.
2. A light-activated control system according to Claim 1, in which the comparator provides a triggering output for operation of a time delay device when the said output signal has a predetermined relationship to the reference voltage level, the time delay device, when triggered, operating the switching means for a predetermined time interval.
3. A light-activated control system according to Claim 2, in which the comparator includes a Schmitt trigger.
4. A light-activated control system according to Claim 2 or Claim 3, in which the time delay device includes a monostable.
5. A light-activated control system according to Claim 2, Claim 3 or Claim 4, in which the predetermined time interval is of the order of ten seconds.
6. A light-activated control system according to any preceding Claim, in which the switch means comprises a relay switch controlling the operation of a warning device in addition to the vehicle lamps.
7. A light-activated control system according to any preceding Claim, in which the switch means control the operation of a flasher unit connected to the said vehicle
lamps for intermittent energisation thereof upon operation of the switch means.
8. A light-activated control system according to any preceding Claims, in which the light sensing means comprise at least one photo-resistive element.
9. A light-activated control system according to any preceding Claim, in which the switch means are inoperative in response to increase in the light intensity sensed by the sensing means due to sunrise.
10. A vehicle fitted with a control system according to any one of the preceding claims, in which the photoelectric light sensing means comprise photo-sensitive elements mounted at the front and rear of the vehicle and connected to the comparator circuit.
11. A vehicle according to Claim 10 in which the switch means are connected to front and rear mounted lamps on the vehicle
and/or to a warning lamp or buzzer located inside the vehicle.
12. A light activated control system, according to Claim 1, in which the switch means are operated in response to an increase in the sensed light intensity through a predetermined threshold level at a rate greater than a predetermined rate, the switch means being maintained dosed as long as the sensed light intensity increases at a rate greater than the said predetermined rate.
13. A light activated control system substantially as herein described with reference to, and as shown in, the accompanying drawings.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB19376A GB1567306A (en) | 1976-01-05 | 1976-01-05 | Light activated control system |
| US05/909,816 US4249160A (en) | 1975-11-21 | 1978-05-26 | Vehicle mounted light activated control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB19376A GB1567306A (en) | 1976-01-05 | 1976-01-05 | Light activated control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1567306A true GB1567306A (en) | 1980-05-14 |
Family
ID=9700069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB19376A Expired GB1567306A (en) | 1975-11-21 | 1976-01-05 | Light activated control system |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1567306A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0067256A1 (en) * | 1981-06-15 | 1982-12-22 | G.R.K. Products Limited | Light activated control system |
| GB2155620A (en) * | 1984-03-06 | 1985-09-25 | Holophane Europ Limited | Photocell and method for calibration thereof |
| GB2185102A (en) * | 1986-01-03 | 1987-07-08 | Lawrence Corbett | Safe overtaking indicator |
| GB2203240A (en) * | 1984-10-18 | 1988-10-12 | Sean Noone | Photoelectric controller |
| GB2244129A (en) * | 1990-04-25 | 1991-11-20 | Laszlo Hamar | Warning light |
| GB2291183A (en) * | 1994-06-30 | 1996-01-17 | Meulen Albert Cornelis V D | Automatic light up system for vehicles |
| GB2307740A (en) * | 1993-12-08 | 1997-06-04 | Gerhard William Pretorius | Device for activating a warning lamp on a vehicle |
| GB2302732B (en) * | 1995-06-28 | 1997-06-04 | John Anthony Hardwick | Vehicle automatic low light level warning unit |
| EP0884216A3 (en) * | 1997-06-10 | 2001-04-18 | Jesag | Vehicle lighting with glare preventing device |
| EP1950089A1 (en) | 2007-01-23 | 2008-07-30 | Delphi Technologies, Inc. | Vehicle illumination |
| EP3815973A1 (en) * | 2019-10-29 | 2021-05-05 | odelo GmbH | Vehicle lamp with active reflex reflector function and method for implementing active reflex reflector function |
-
1976
- 1976-01-05 GB GB19376A patent/GB1567306A/en not_active Expired
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0067256A1 (en) * | 1981-06-15 | 1982-12-22 | G.R.K. Products Limited | Light activated control system |
| GB2155620A (en) * | 1984-03-06 | 1985-09-25 | Holophane Europ Limited | Photocell and method for calibration thereof |
| GB2203240A (en) * | 1984-10-18 | 1988-10-12 | Sean Noone | Photoelectric controller |
| GB2203240B (en) * | 1984-10-18 | 1989-06-07 | Sean Noone | A photoelectric control unit |
| GB2185102A (en) * | 1986-01-03 | 1987-07-08 | Lawrence Corbett | Safe overtaking indicator |
| GB2244129A (en) * | 1990-04-25 | 1991-11-20 | Laszlo Hamar | Warning light |
| GB2307740A (en) * | 1993-12-08 | 1997-06-04 | Gerhard William Pretorius | Device for activating a warning lamp on a vehicle |
| GB2291183A (en) * | 1994-06-30 | 1996-01-17 | Meulen Albert Cornelis V D | Automatic light up system for vehicles |
| GB2302732B (en) * | 1995-06-28 | 1997-06-04 | John Anthony Hardwick | Vehicle automatic low light level warning unit |
| EP0884216A3 (en) * | 1997-06-10 | 2001-04-18 | Jesag | Vehicle lighting with glare preventing device |
| EP1950089A1 (en) | 2007-01-23 | 2008-07-30 | Delphi Technologies, Inc. | Vehicle illumination |
| EP3815973A1 (en) * | 2019-10-29 | 2021-05-05 | odelo GmbH | Vehicle lamp with active reflex reflector function and method for implementing active reflex reflector function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |