GB1214981A - Control means using light filters - Google Patents
Control means using light filtersInfo
- Publication number
- GB1214981A GB1214981A GB2102267A GB2102267A GB1214981A GB 1214981 A GB1214981 A GB 1214981A GB 2102267 A GB2102267 A GB 2102267A GB 2102267 A GB2102267 A GB 2102267A GB 1214981 A GB1214981 A GB 1214981A
- Authority
- GB
- United Kingdom
- Prior art keywords
- light
- door
- polarising
- filters
- cells
- 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
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 239000011521 glass Substances 0.000 abstract 1
- 238000005286 illumination Methods 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 239000010703 silicon Substances 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
- G08C23/04—Non-electrical signal transmission systems, e.g. optical systems using light waves, e.g. infrared
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
- H01H47/24—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil having light-sensitive input
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Power-Operated Mechanisms For Wings (AREA)
Abstract
1,214,981. Photoelectric door operating mechanism. J. HORROCKS. 4 July, 1968 [5 May, 1967], No. 21022/67. Heading E2M. [Also in Division G1] Photoelectric control apparatus comprises one or more polarising filters and two or more photoelectric cells which are arranged to produce a control signal only when light polarised in one or more particular directions of polarisation is incident thereon. The aparatus could be used to control movement of a machine tool, a window, lift, crane, &c., but is described with reference to the automatic opening of a garage door or doors. The arrangement of Fig. 2, for example, is mounted adjacent the door to be controlled and comprises a tubular housing 22 containing a protective glass lens or plate 24, a two-way mirror or red filter 26, to reduce the overall light intensity, a polarising filter 28 and two sulphide photoresistors 30, 32 one mounted in front of and one behind, the filter. The cells 30, 32 are connected in the collector-base and emitter-base circuits, respectively, of a switching transistor, (40) Fig. 6 (not shown), mounted on circuit board 34. When ordinary unpolarised light is shone onto the tube 22, the cells 30, 32 are substantially equally illuminated, having no effect on the transistor (40). However, if polarised light of a polarisation plane orientated at 90‹ to that of filter 28 is directed at the device, the cell 32 receives no light and the transistor circuit is unbalanced causing it to conduct and energise a relay resulting in starting of a motor controlling opening of the garage door. Light of this preferred direction of polarisation may be provided from the vehicle to be garaged 'by fitting the vehicle headlamp with a polarised lens of the required characteristics. In a second arrangement, Fig. 3 (not shown), two polarising filters (56), mounted with their polarisation directions at different angles, are positioned in front of two photocells (50, 52) and a further photocell (54) is provided with no polarising filter in front of it. The cells (50, 52) are conected in parallel in the anode circuit of a silicon controlled rectifier and the cell (54) in its cathode circuit, Fig. 7 (not shown). On illumination of the device by ordinary unpolarised light, again no triggering occurs, but light from a headlight having a lens with two polarising sections of different polarisation directions, causes triggering of the SCR since the light reaching cells (50, 52) through the filters is of much lower intensity than that incident on cell (54). The angular settings of filters (56) and the head-lamp lens sections can be adjustable to give unique operation. This selectivity is further improved if three filters and four photocells are used with a headlamp having three polarising sections. To operate the headlamps, a press button switch on the vehicle is operated, being pressed continuously to keep the transistor of the Fig. 6 circuit energised, but only instantaneously for the SCR circuit. The latter may be switched off by a mechanical switch operated by the motor driving the door. A warning device may be connected to the circuits to be energised when unpolarised light is used to illuminate the photocell 32 or photocells (50, 52). Manual switching of the motor to open the door is possible, e.g. by the vehicle ignition key. Limit switches may provide automatic stopping of the motor when the door is opened or closed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2102267A GB1214981A (en) | 1967-05-05 | 1967-05-05 | Control means using light filters |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2102267A GB1214981A (en) | 1967-05-05 | 1967-05-05 | Control means using light filters |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1214981A true GB1214981A (en) | 1970-12-09 |
Family
ID=10155876
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2102267A Expired GB1214981A (en) | 1967-05-05 | 1967-05-05 | Control means using light filters |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1214981A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0200186A2 (en) * | 1985-04-30 | 1986-11-05 | Cerberus Ag | Light barrier |
-
1967
- 1967-05-05 GB GB2102267A patent/GB1214981A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0200186A2 (en) * | 1985-04-30 | 1986-11-05 | Cerberus Ag | Light barrier |
EP0200186A3 (en) * | 1985-04-30 | 1987-01-21 | Cerberus Ag | Light barrier |
US4734575A (en) * | 1985-04-30 | 1988-03-29 | Cerberus Ag | Light barrier utilizing two radiation branches each having differently polarized filters |
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