JPS4932581U - - Google Patents
Info
- Publication number
- JPS4932581U JPS4932581U JP1972072536U JP7253672U JPS4932581U JP S4932581 U JPS4932581 U JP S4932581U JP 1972072536 U JP1972072536 U JP 1972072536U JP 7253672 U JP7253672 U JP 7253672U JP S4932581 U JPS4932581 U JP S4932581U
- Authority
- JP
- Japan
- 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.)
- Pending
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
- G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
- G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
-
- 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
- G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
- G08B17/113—Constructional details
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1972072536U JPS4932581U (en) | 1972-06-21 | 1972-06-21 | |
| GB2739073A GB1400658A (en) | 1972-06-21 | 1973-06-08 | Light scattering type smoke detector |
| FR7322489A FR2189801B1 (en) | 1972-06-21 | 1973-06-20 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1972072536U JPS4932581U (en) | 1972-06-21 | 1972-06-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS4932581U true JPS4932581U (en) | 1974-03-22 |
Family
ID=13492157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1972072536U Pending JPS4932581U (en) | 1972-06-21 | 1972-06-21 |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS4932581U (en) |
| FR (1) | FR2189801B1 (en) |
| GB (1) | GB1400658A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5144384U (en) * | 1974-09-28 | 1976-04-01 |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2434178C2 (en) * | 1974-07-16 | 1983-12-08 | Matsushita Electric Works, Ltd., Kadoma, Osaka | Smoke alarm device based on the light scattering principle |
| GB2272760A (en) * | 1992-11-20 | 1994-05-25 | Thorn Security | Optical detection of combustion products |
| CN110148277B (en) * | 2019-04-20 | 2021-04-20 | 北京升哲科技有限公司 | MEMS smoke sensor based on dual-wavelength detection |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5230954U (en) * | 1975-08-27 | 1977-03-04 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3383670A (en) * | 1964-07-13 | 1968-05-14 | Gordon A. Roberts | Smoke and heat detection unit |
| US3505529A (en) * | 1968-02-08 | 1970-04-07 | Bliss Co | Radiation sensitive smoke detecting device |
| DE1915906A1 (en) * | 1968-04-03 | 1969-11-06 | Berkeley Scient Lab Inc | Smoke detector |
| US3708675A (en) * | 1969-09-19 | 1973-01-02 | Furukawa Electric Co Ltd | Smoke detector in which air entrance and egress are located in oppositely disposed surfaces which are shaped to cause an air velocity differential |
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1972
- 1972-06-21 JP JP1972072536U patent/JPS4932581U/ja active Pending
-
1973
- 1973-06-08 GB GB2739073A patent/GB1400658A/en not_active Expired
- 1973-06-20 FR FR7322489A patent/FR2189801B1/fr not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5230954U (en) * | 1975-08-27 | 1977-03-04 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5144384U (en) * | 1974-09-28 | 1976-04-01 |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2189801B1 (en) | 1977-07-29 |
| FR2189801A1 (en) | 1974-01-25 |
| GB1400658A (en) | 1975-07-23 |