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公开(公告)号：DE2312977A1
公开(公告)日：1973-09-27
申请号：DE2312977
申请日：1973-03-15
Applicant: ELECTRO SIGNAL LAB
Inventor： ENEMARK ROBERT BRUUN
IPC: G08B17/107 , G08B23/00
Abstract: In a smoke detector a regulated, half-wave rectifier supplies power for an exciter lamp, a photocell shielded from the lamp but viewing an area illuminated by the lamp, and a relay switching circuit triggered by the cell for applying the half-wave current to the winding of a horn so as to cause the horn to sound at the half-wave frequency when the cell senses smoke scattered from the illuminated area. The switching circuit for the horn can also be triggered by a thermostatic switch responsive to high ambient temperature. Failure of the exciter lamp or voltage regulator deenergizes the relay, switching in a pulsing circuit which sounds the horn at a distinctively different frequency than the smoke alarm.
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公开(公告)号：FR2141655A1
公开(公告)日：1973-01-26
申请号：FR7147163
申请日：1971-12-28
Applicant: ELECTRO SIGNAL LAB
IPC: G01N21/53 , G08B17/107 , G01N15/00 , A62C39/00
Abstract: A smoke detector with a first cell sensing light scattered from matter to be detected and a second compensating cell has an adjustable plug for varying light from a source to the compensating cell and a diffuser for spreading the adjusted light over the same area of the compensating cell as the area of the first cell exposed to scattered light.
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公开(公告)号：DE2355784C2
公开(公告)日：1983-10-27
申请号：DE2355784
申请日：1973-11-08
IPC: G01N21/47 , G01N21/53 , G08B17/10 , G08B17/107
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公开(公告)号：IT1000987B
公开(公告)日：1976-04-10
申请号：IT971273
申请日：1973-12-06
Applicant: ELECTRO SIGNAL LAB
IPC: G01J1/02 , G01N21/53 , G08B17/10 , G08B17/107 , A62C
Abstract: An optical smoke detector comprises split optical block mounting an exciter lamp and a smoke sensing photocell in two passages directed toward an intersection zone in a dark chamber formed by one side of the block, a base with a bottom and side wall and a cover, all secured together by one screw. A light pipe from the lamp extends outside the cover to indicate lamp operation. A second photocell is in a third passage communicating with the lamp passage, the third passage mounting diffuser and pin hole apertured disks for spreading a controlled light intensity over the second photocell. The optical block assembly includes an alarm circuit board operatively connected to the photocells and physically positioning the block on the base.
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公开(公告)号：FR2239169A5
公开(公告)日：1975-02-21
申请号：FR7341045
申请日：1973-11-19
Applicant: ELECTRO SIGNAL LAB
IPC: G01J1/02 , G01N21/53 , G08B17/10 , G08B17/107 , G01N15/06
Abstract: An optical smoke detector comprises split optical block mounting an exciter lamp and a smoke sensing photocell in two passages directed toward an intersection zone in a dark chamber formed by one side of the block, a base with a bottom and side wall and a cover, all secured together by one screw. A light pipe from the lamp extends outside the cover to indicate lamp operation. A second photocell is in a third passage communicating with the lamp passage, the third passage mounting diffuser and pin hole apertured disks for spreading a controlled light intensity over the second photocell. The optical block assembly includes an alarm circuit board operatively connected to the photocells and physically positioning the block on the base.
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Patent Agency Ranking
公开(公告)号：FR2141655B1
公开(公告)日：1973-07-13
申请号：FR7147163
申请日：1971-12-28
Applicant: ELECTRO SIGNAL LAB
IPC: G01N21/53 , G08B17/107 , G01N15/00 , A62C39/00
Abstract: A smoke detector with a first cell sensing light scattered from matter to be detected and a second compensating cell has an adjustable plug for varying light from a source to the compensating cell and a diffuser for spreading the adjusted light over the same area of the compensating cell as the area of the first cell exposed to scattered light.
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公开(公告)号：IT942068B
公开(公告)日：1973-03-20
申请号：IT980371
申请日：1971-12-18
Applicant: ELECTRO SIGNAL LAB
Inventor： STEELE D
IPC: G01N21/53 , G08B17/107 , G08B
Abstract: A smoke detector with a first cell sensing light scattered from matter to be detected and a second compensating cell has an adjustable plug for varying light from a source to the compensating cell and a diffuser for spreading the adjusted light over the same area of the compensating cell as the area of the first cell exposed to scattered light.
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公开(公告)号：CA1022644A
公开(公告)日：1977-12-13
申请号：CA185558
申请日：1973-11-13
Applicant: ELECTRO SIGNAL LAB
Inventor： STEELE DONALD F , ENEMARK ROBERT B
IPC: G01J1/02 , G01N21/53 , G08B17/10 , G08B17/107
Abstract: An optical smoke detector comprises split optical block mounting an exciter lamp and a smoke sensing photocell in two passages directed toward an intersection zone in a dark chamber formed by one side of the block, a base with a bottom and side wall and a cover, all secured together by one screw. A light pipe from the lamp extends outside the cover to indicate lamp operation. A second photocell is in a third passage communicating with the lamp passage, the third passage mounting diffuser and pin hole apertured disks for spreading a controlled light intensity over the second photocell. The optical block assembly includes an alarm circuit board operatively connected to the photocells and physically positioning the block on the base.
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公开(公告)号：GB1410283A
公开(公告)日：1975-10-15
申请号：GB1052673
申请日：1973-03-05
Applicant: ELECTRO SIGNAL LAB
IPC: G01N21/25 , G08B17/107 , G01N21/48
Abstract: 1410283 Photo-electric particle detectors ELECTRO SIGNAL LAB Inc 5 March 1973 [3 March 1972] 10526/73 Heading G1A Apparatus for detecting fluid borne particles, e.g. a smoke detector, includes a dark chamber 6 whose walls are transmissive of fluid borne particles, a plurality of solid state lamps 22, e.g. l.e.d.'s, mounted in an elongate array and electrically connected in series, a first elongate cylindrical lens 30 disposed parallel to the lamp array for projecting a ribbon of light into the chamber, a bar-shaped photo-detector 26 having a single photo-conductive surface of substantially the same length as the array of lamps and mounted parallel to the lamp array, a second cylindrical lens 31 disposed parallel to the photo-detector between the photo-detector and the chamber so as to view the chamber on a ribbon-like path having a substantially linear intersection with the ribbon of light, the photo-detector being responsive to light modulated by particles at the intersection, and means for detecting the response of the photo-detector to the modulated light. As shown the apparatus includes a base 2 of wood or plastics supporting the lamp array and the detector, and a wall 3 e.g. of polyurethane foam. The lamps 22 are arranged in series on a phenolic base 21, Figs.4 and 5 (not shown). The detector 26, Fig.3 (not shown), consists of two electrode areas connected to output terminals 28 and separated by a zig-zag photo-conductive surface. As shown in Fig.6, the diodes 22 are connected to a single constant current source and the output terminals 28 are connected to a circuit 32 for providing an alarm.
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