GB1555182A - Smoke detector - Google Patents
Smoke detectorInfo
- Publication number
- GB1555182A GB1555182A GB47701/77A GB4770177A GB1555182A GB 1555182 A GB1555182 A GB 1555182A GB 47701/77 A GB47701/77 A GB 47701/77A GB 4770177 A GB4770177 A GB 4770177A GB 1555182 A GB1555182 A GB 1555182A
- Authority
- GB
- United Kingdom
- Prior art keywords
- smoke
- pulse
- pulses
- alarm
- reflected
- 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
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
Abstract
An alarm device (K) is actuated by an integrator (T) only if a photocell (C) receives a plurality of successive light pulses, reflected by smoke. In the disconnected mode, a light source (LED) is fed by a pulse generator (P) with low frequency. A first light pulse reflected by smoke occurring triggers via the photocell (C) a flip-flop (F), the output signal of which closes a switch (S1) in order to reduce the distance from the next pulse emitted by the pulse generator (P). Thus, if smoke persists, the number of pulses which the integrator (T) requires to set off the alarm is received in a shorter time. In another embodiment, the pulse frequency is increased by the first light pulse reflected by the smoke for the duration of a predetermined number of pulses or for the duration of a predetermined period of time. In both embodiments, the time required for the alarm to be set off is thus reduced, without increasing the power consumption of the detector device in the disconnected mode and without reducing the service life of the pulsating light source. <IMAGE>
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/742,225 US4068130A (en) | 1976-11-16 | 1976-11-16 | Smoke detector with means for changing light pulse frequency |
| US05/742,194 US4075499A (en) | 1976-11-16 | 1976-11-16 | Smoke detector with means for changing light pulse frequency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1555182A true GB1555182A (en) | 1979-11-07 |
Family
ID=27113981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB47701/77A Expired GB1555182A (en) | 1976-11-16 | 1977-11-16 | Smoke detector |
Country Status (14)
| Country | Link |
|---|---|
| JP (1) | JPS5387282A (en) |
| AR (1) | AR215485A1 (en) |
| AU (1) | AU512053B2 (en) |
| BR (1) | BR7707636A (en) |
| CA (1) | CA1085019A (en) |
| CH (1) | CH620038A5 (en) |
| DE (1) | DE2751073C2 (en) |
| FR (1) | FR2370974A1 (en) |
| GB (1) | GB1555182A (en) |
| IE (1) | IE46081B1 (en) |
| IL (1) | IL52977A (en) |
| IN (1) | IN147535B (en) |
| NZ (1) | NZ185220A (en) |
| SE (1) | SE421841B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2939139A1 (en) * | 1979-09-27 | 1981-04-09 | Agfa-Gevaert Ag, 5090 Leverkusen | DISTANCE MEASURING DEVICE |
| JPS56100343A (en) * | 1980-01-14 | 1981-08-12 | Matsushita Electric Works Ltd | Photoelectric type smoke sensor |
| JPS6225802U (en) * | 1985-07-31 | 1987-02-17 | ||
| DE3840277C2 (en) * | 1988-11-30 | 1997-04-17 | Diehl Gmbh & Co | Device for locating vehicles in the battlefield |
| DE102014110460B3 (en) | 2014-07-24 | 2015-05-13 | Eq-3 Entwicklung Gmbh | Optical smoke detector and method for optical smoke detection |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3917956A (en) * | 1974-03-08 | 1975-11-04 | Pyrotector Inc | Smoke detector |
| US3946241A (en) * | 1973-11-26 | 1976-03-23 | Pyrotector, Incorporated | Light detector with pulsed light source and synchronous data gating |
-
1977
- 1977-09-21 NZ NZ185220A patent/NZ185220A/en unknown
- 1977-09-21 IL IL52977A patent/IL52977A/en unknown
- 1977-10-04 IN IN291/DEL/77A patent/IN147535B/en unknown
- 1977-10-31 AR AR269786A patent/AR215485A1/en active
- 1977-11-07 CA CA290,290A patent/CA1085019A/en not_active Expired
- 1977-11-08 JP JP13403377A patent/JPS5387282A/en active Granted
- 1977-11-08 CH CH1362577A patent/CH620038A5/en not_active IP Right Cessation
- 1977-11-11 IE IE2298/77A patent/IE46081B1/en unknown
- 1977-11-14 SE SE7712831A patent/SE421841B/en unknown
- 1977-11-15 DE DE2751073A patent/DE2751073C2/en not_active Expired
- 1977-11-15 AU AU30668/77A patent/AU512053B2/en not_active Expired
- 1977-11-16 GB GB47701/77A patent/GB1555182A/en not_active Expired
- 1977-11-16 BR BR7707636A patent/BR7707636A/en unknown
- 1977-11-16 FR FR7734469A patent/FR2370974A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5724501B2 (en) | 1982-05-25 |
| NZ185220A (en) | 1981-10-19 |
| SE421841B (en) | 1982-02-01 |
| AU512053B2 (en) | 1980-09-18 |
| FR2370974A1 (en) | 1978-06-09 |
| CH620038A5 (en) | 1980-10-31 |
| IE46081L (en) | 1978-05-16 |
| AR215485A1 (en) | 1979-10-15 |
| JPS5387282A (en) | 1978-08-01 |
| AU3066877A (en) | 1979-05-24 |
| SE7712831L (en) | 1978-05-17 |
| BR7707636A (en) | 1978-08-01 |
| IL52977A (en) | 1979-09-30 |
| IE46081B1 (en) | 1983-02-09 |
| IL52977A0 (en) | 1977-11-30 |
| CA1085019A (en) | 1980-09-02 |
| DE2751073A1 (en) | 1978-05-24 |
| DE2751073C2 (en) | 1982-06-03 |
| IN147535B (en) | 1980-03-29 |
| FR2370974B1 (en) | 1983-12-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CO4771010A1 (en) | METHOD AND APPARATUS FOR GENERATING TIME REGULATED SIGNALS IN A RADIOCOMMUNICATION UNIT | |
| GB1555182A (en) | Smoke detector | |
| US4125779A (en) | Smoke detector | |
| US4068130A (en) | Smoke detector with means for changing light pulse frequency | |
| FR2258639A1 (en) | Short distance target detection system - uses pulsed semiconductor laser transmission with correlation in receiver | |
| JPS56101517A (en) | Pulse oscillator | |
| GB1374248A (en) | Control systems | |
| JPS5420697A (en) | Light beam type detector | |
| JPS5756830A (en) | Wireless lamp increasing system | |
| SU123348A1 (en) | Binary pulse counter on ferromagnetic elements | |
| CA1117201A (en) | Smoke detector | |
| JPS54111233A (en) | Optical code reader | |
| JPS6436116A (en) | Timing pulse generating circuit | |
| JPS5441099A (en) | Glass plate breakage detector | |
| JPS5454084A (en) | Photoelectric smoke detector | |
| JPS5540419A (en) | Flash device | |
| JPS53123985A (en) | Photoelectric type smoke detector | |
| JPS57188132A (en) | State display device for time limit relay | |
| JPS54151467A (en) | Light measuring pulse transmission apparatus | |
| JPS542116A (en) | Light source circuit for data imprinting of cameras | |
| JPS52133235A (en) | Judging circuit | |
| JPS5229287A (en) | Detection apparatus | |
| JPS5483395A (en) | Light beam warning unit | |
| JPS5672331A (en) | Smoke detector of photoelectric type | |
| JPS57130272A (en) | Recording body with program search signal generation part |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19931116 |