Abstract: Described is a system for detecting toxic levels of a contaminate in a monitored area. The system controls an air evacuation device that operates in response to the detection of a predetermined level of contamination. The system also acts to deactivate appliances that may be contributing to the level of contamination. In addition, the system alerts local emergency units with a pre-recorded message of the emergency situation.

Abstract: A clock and ambient air condition sensing apparatus includes an alarm and ambient air sensor positioned in a housing and operatively connected to a logic circuit. The logic circuit is capable of evaluating air sensor data and energizing the alarm upon a preselected ambient air condition. A first battery is connected to the circuit for powering the air sensor. The housing includes a front cover pivotally movable between open and closed configurations. A clock is mounted to the front cover for displaying a relative time and is releasably electrically connected to the circuit. A second battery is connected to the circuit for powering the clock. The circuit is capable of evaluating the strength of the first and second batteries and of directing current from the second battery to the air sensor if the first battery is inoperable.

Abstract: A self-contained smoke detector system has internal self-diagnostic capabilities and accepts a replacement smoke intake canopy (14) without a need for recalibration. The system includes a microprocessor-based self-diagnostic circuit (200) that periodically checks sensitivity of the optical sensor electronics (24, 28) to smoke obscuration level. By setting tolerance limits on the amount of change in voltage measured in clean air, the system can provide an indication of when it has become either under-sensitive or over-sensitive to the ambient smoke obscuration level. An algorithm implemented in software stored in system memory (204) determines whether and provides an indication that for a time (such as 27 hours) the clean air voltage has strayed outside established sensitivity tolerance limits. The replaceable canopy is specially designed with multiple pegs (80) having multi-faceted surfaces (110, 112, 114).

Abstract: A smoke detection chamber for use in a photoelectric smoke detector. The smoke detection chamber comprises a side wall with a double row of generally rectangular vanes arranged to provide a labyrinth extending generally around the entire side wall for ingress and egress of smoke particles, a top and a bottom. A mounting arrangement for a photoemitting diode is provided in the side wall of the smoke detection chamber so that a light beam from a photoemitting diode is transmitted across the smoke detection chamber. The mounting arrangement extends from and is spaced from the bottom to provide minimal interference for entry of smoke particles. The bottom of the smoke detection chamber has an opening therein with a shielding arrangement thereabout open to the chamber for a photodiode detector, the opening and shielding arrangement being located between the centerline of the smoke detection chamber and the mounting arrangement in the side wall of the chamber.

Abstract: A microcontroller-based hazardous condition detector having an intelligent hush feature is presented. The microcontroller controls the operational mode of the detector by monitoring a single user-actuated switch, the inputs from a smoke chamber and a carbon monoxide detector circuit, and the current operating mode of the detector. When in a normal or no-alarm mode, actuation of the switch will cause the microcontroller to place the detector in a test mode of operation. If the detector is in a carbon monoxide alarm mode, actuation of the switch will act to reset the accumulator function of the microprocessor for the carbon monoxide alarm sensing. If the detector is in a smoke alarm mode, actuation of the switch may place the detector in a hush mode if the level of smoke is sufficiently low, or will have no effect if the level of smoke is too high. Once in the hush mode, actuation of the switch will place the detector into the smoke alarm mode.

Abstract: An improved fire detector unit has a plastic base defining a smoke chamber for detection of a smoke density in terms of light scattering due to the smoke particles in the smoke chamber. The base carries a circuit board mounting a light emitting element, a light receiving element, and other components forming a fire detecting circuit responsible for generating a fire warning signal based upon the detected smoke density. A metal-made electromagnetic shield is molded into the base to protect the light receiving element from electromagnetic radiation noises. The electromagnetic shield includes a ground terminal for connection with a ground line of the circuit board. In addition, terminal pins are molded into the base for electrical and physical connection of the circuit board to the base.

Abstract: An apparatus and method for detecting a connection to a data transmission network functions by detecting the network signal energy on a network cable while avoiding the problems of excessive power consumption and generation of excessive electrical noise. By monitoring the receive network lines and determining if there is electrical energy on the cable in the form particular to the type of network supported by the network adaptor card, the host computing device can power-down the transceiver associated with the network adaptor card until an active network connection is detected.

Abstract: In a sampling tube-type smoke detector equipped with a smoke detection device detects smoke particles contained in the air suctioned from a monitored area through a sampling tube by an aspirator positioned in the downstream. The smoke detection device the sampling tube forms a lead-in tube and suctions air through the sampling tube in an almost straight line. The lead-in tube is formed with a smoke sensor unit to detect smoke particles contained in the air. The aspirator comprises a rotating part which forms an actuator mechanism that discharges the air. The central axis of the lead-in tube and the rotational axis of the actuator mechanism of the aspirator are almost the same axle. The sampling tube-type smoke detector is provided to reduce pressure loss in the airflow traveling from the smoke detection device to the aspirator and to supply a low cost, compact smoke detection device driven by a small-sized fan.

Abstract: A mounting kit and smoke detecting apparatus releasably mountable to a distant support surface, including a smoke detector weighing W, a support plate securable to the support surface and releasably securable to the smoke detector by a separating force of Y, and a longitudinal member having a proximate end graspable by a user and a distal end releasably securable to the smoke detector. A selectable first connector on the distal end is releasably securable to the smoke detector for mounting the smoke detector to the support plate and a selectable second connector is securable to the smoke detector for detaching the smoke detector from the support plate. The first connector is secured to the smoke detector by a separating force no greater than X and the second connector is secured to the smoke detector by a separating force no less than Z. At least one of X<(Y−W) and X<Y is true, and at least one of Y<Z and (Y−W)<Z is true.

Abstract: A smoke detector includes a housing defining a dark chamber admitting test atmosphere. A light receiver is disposed within the chamber. A scatter emitter is positioned within the chamber such that light strikes the receiver when reflected off particles suspended in the test atmosphere. An obscuration emitter is positioned within the chamber such that light emitted is directed to the receiver unless obstructed by particles suspended in the test atmosphere. A smoke detect signal is generated responsive to a measurement made responsive to the scatter emitter and/or the obscuration emitter.

Abstract: An apparatus for testing a smoking or fire detector includes an open-topped housing for receiving a detector under test. A stream of fluid for activating the detector is generated in a portion of the housing below the detector and is directed by a duct up one side of the interior of the housing to flow across the housing in a direction of the detector. A spacer can be provided in order to ensure that the direction of flow is precisely located at a point that is a predetermined distance above the bottom of the detector. Also, a heating element may be provided in the duct if required.

Abstract: The present invention relates to a method for detecting fire with light section image to sense smoke. Infrared radiation arrays (1) and infrared cameras (2) are provided in a monitored area. The images of the infrared light spots transmitted by the infrared radiation arrays (1) are converted into video signals by the infrared cameras (2), and transferred to a video switcher (3). The video switcher sends the video signals received from the infrared cameras to a computer (4) one by one. The computer processes the signals. If fire is sensed, the computer controls the alarm unit (5) to alarm by a linkage.

Abstract: A light scattering type smoke sensor comprising a holder with openings embedded with light emitting part and light detecting part respectively, which do not protrude into the smoke detection chamber. The optical axis of light emitting part intersects at a predetermined first angle &agr; in the horizontal direction with the optical axis of the light detecting part at a predetermined second angle &bgr; in the vertical direction. The optical axis of the light emitting part and optical axis of the light detecting part further comprise a configuration angle &dgr; in the range of 90˜120 degrees used as the supplementary angle for the scattering angle &thgr;. Accordingly, the smoke detection part is further constituted in a thin-shaped light scattering smoke sensor which enables the setup of a scattering angle with no directivity in the smoke influx to the smoke detection chamber.

Abstract: An ambient condition detector incorporates a common radiant energy source to carry out a first, sensing, function and a second, information transmitting function. The source can generate a beam to implement a fire sensing function. In addition, modulated radiant energy emitted from the source can be remotely sensed to determine detector status or internal parameter values. In an alternate embodiment, a source of radiant energy can be configured at an exterior periphery of the detector and information can be wirelessly transmitted therefrom using one or more analog modulation processes.

Abstract: A smoke density monitor for mounting on a ship smokestack. The smoke density monitor provides a transmitter head and a receiver head mounted to a smokestack. The transmitter head and receiver head are optically connected with a density monitor by means of fiber-optic lines. The density monitor is electrically connected to an alarm monitor, which at pre-set smokestack smoke densities activates an alarm and/or shuts down the ship's burner(s). An optional recorder may be connected to the alarm monitor to preserve a record of smoke density. Each transmitter and recorder head has an optical head slidably attached to a head housing for ease of servicing and maintenance.

Abstract: A non-imaging optical coupler that is a figure of revolution combining a light-transmitting body defining a recessed input cavity, a transparent droplet-shaped encapsulant of a light-emitting diode, or array of diodes in the cavity, the body having a curved side wall shaped to totally internally reflect all the light emitted from the LED and encapsulant, traveling toward the side wall, within a predetermined distance from the diode or center of array, the body having a cylindrical transition section extending from a curved side wall and forwardly, and a planar exit face at the forward end of the body, transverse to the central axis of the figure of revolution.

Abstract: A method of fabricating various models of fire detectors only from a limited number of common parts or unit in accordance with user's specific needs but at a reduced cost. The method utilizes a smoke sensor unit (1), a thermal sensor unit (2), a signal processing unit (3), a signal transmission unit (4), and a power unit (5), and then combines at least one of the smoke sensor unit and the thermal sensor unit with the power unit and optionally with at least one of the signal processing unit and the signal transmission unit.

Abstract: A flame-sensing element and supporting circuitry is disguised by installing it in an object normally found within the type of room in which it is to monitor. In the best example, a lavatory is monitored by installing a mock fire-safety sprinkler head on the ceiling; the glass-bulb trigger element of a sprinkler head is replaced with a glass bulb flame-sensing element. Alternatively, the glass bulb flame-sensing element and associated electronics may be concealed in a housing designed to house a room deodorant, an air purifier of the ultraviolet or ozone-generating type, a reservoir for a liquid toilet bowl or urinal deodorant, behind the grille of a ventilating air vent, behind the grille of a loudspeaker housing, or within the housing of a smoke detector. The disguise or concealment is meant to hide the apparatus from notice by a surreptitious smoker who would smoke tobacco in an area wherein smoking is prohibited, especially in school lavatories.

Abstract: A smoke detector is provided with a light emission section holder having a light-emission element and a light receiving section holder having a light-receiving element. The light emission section holder and the light-receiving element are provided in a smoke detection section constituting a smoke detection space. The light emitted from the light-emission element is scattered by smoke entered the smoke detection space. The thus-scattered light is received by the light-receiving element,thereby detecting occurrence of fire. An insect screen is formed from soft fiber having a mesh pattern and is arranged so as to cover the entirety of the smoke detection section.

Abstract: A scattering light smoke alarm has a light transmitter and a light receiver arranged so that a scattering point of the light transmitter and the light receiver are located outside the scattering light smoke alarm in a free space, a cover for protecting the light receiver and the light transmitter, and an element for distinguishing between smoke and other foreign bodies which are located in an area around the scattering point.

Abstract: A self-contained smoke detector system has internal self-diagnostic capabilities and accepts a replacement smoke intake canopy (14) without a need for recalibration. The system includes a microprocessor-based self-diagnostic circuit (200) that periodically checks sensitivity of the optical sensor electronics (24, 28) to smoke obscuration level. By setting tolerance limits on the amount of change in voltage measured in clean air, the system can provide an indication of when it has become either under-sensitive or over-sensitive to the ambient smoke obscuration level. An algorithm implemented in software stored in system memory (204) determines whether and provides an indication that for a time (such as 27 hours) the clean air voltage has strayed outside established sensitivity tolerance limits. The replaceable canopy is specially designed with multiple pegs (80) having multi-faceted surfaces (110, 112, 114).

Abstract: An ambient condition detector incorporates a common radiant energy source to carry out a first, sensing, function and a second, information transmitting function. The source can generate a beam to implement a fire sensing function. In addition, modulated radiant energy emitted from the source can be remotely sensed to determine detector status or internal parameter values. In an alternate embodiment, a source of radiant energy can be configured at an exterior periphery of the detector and information can be wirelessly transmitted therefrom using one or more analog modulation processes.

Abstract: An improved fire detector unit has a plastic base defining a smoke chamber for detection of a smoke density in terms of light scattering due to the smoke particles in the smoke chamber. The base carries a circuit board mounting a light emitting element, a light receiving element, and other components forming a fire detecting circuit responsible for generating a fire warning signal based upon the detected smoke density. A metal-made electromagnetic shield is molded into the base to protect the light receiving element from electromagnetic radiation noises. The electromagnetic shield includes a ground terminal for connection with a ground line of the circuit board. In addition, terminal pins are molded into the base for electrical and physical connection of the circuit board to the base.

Abstract: A smoke alarm device has an ASIC (1) with an integrated photo detector (3) and control circuit. The photo detector output is compared every ten seconds with an alarm threshold level in a comparator circuit (10), with a sensitivity-decrease threshold in a comparator circuit (11), and with a sensitivity-increase threshold in a comparator circuit (12). A logic block (2) causes sensitivity to be increased or decreased in which decreases take place at intervals of six hours and increases take place after 40 secs. The logic block (2) provides for least sensitivity at power-up with rapid increases to the appropriate level according to the level of back-scatter caused by dust contamination. The logic block (2) maintains a high signal on an interconnect terminal (9) for four seconds after a test button (7) is pressed so that a maintenance person can hear remote interconnected devices after the local device has stopped sounding.

Abstract: A smoke sensor and a carbon monoxide sensor are integrated into a common detector housing. The smoke sensor is coupled to a smoke detector control integrated circuit which generates a binary output signal indicative of the presence of smoke. This signal is coupled to a programmed microprocessor in the detector housing. The carbon monoxide sensor is also coupled to the microprocessor. Outputs from the two sensors are processed substantially independently. In the presence of smoke, the smoke alarm is generated by the microprocessor. In the presence of sufficient levels of carbon monoxide, in the absence of smoke, a carbon monoxide alarm will be generated.

Abstract: A test apparatus for testing a detector such as a smoke detector or the like comprises a housing member pivotally mounted on the end of a pole and containing a test element for testing the detector. The housing member has an opening and is adapted to be placed over the detector under test. The presence of the detector within the housing member is sensed using a non-contact arrangement such as a photo-electric system and causes the tests to be activated to test the detector. A power supply for the test element is mounted in or on the pole adjacent the housing member and power is supplied to the test element using electrically conductive members which provide both mechanical and electrical connection between the housing member and the pole.

Abstract: A smoke detecting chamber for use in a light-scattering type smoke detector is provided which includes a chamber cover that forms one side of the smoke detecting chamber. The chamber cover includes a plurality of first baffles that prevent external light from entering the smoke chamber. The smoke detector further includes a chamber base that forms another side of the smoke detecting chamber, the chamber base including a plurality of second baffles that intermesh with the first baffles when the smoke detecting chamber is formed.

Abstract: A smoke detection chamber for use in a photoelectric smoke detector. The smoke detection chamber comprises a side wall with a double row of generally rectangular vanes arranged to provide a labyrinth extending generally around the entire side wall for ingress and egress of smoke particles, a top and a bottom. A mounting arrangement for a photoemitting diode is provided in the side wall of the smoke detection chamber so that a light beam from a photoemitting diode is transmitted across the smoke detection chamber. The mounting arrangement extends from and is spaced from the bottom to provide minimal interference for entry of smoke particles. The bottom of the smoke detection chamber has an opening therein with a shielding arrangement thereabout open to the chamber for a photodiode detector, the opening and shielding arrangement being located between the centerline of the smoke detection chamber and the mounting arrangement in the side wall of the chamber.

Abstract: A scattering light smoke alarm has a light transmitter and a light receiver arranged so that a scattering point of the light transmitter and the light receiver are located outside the scattering light smoke alarm in a free space, a cover for protecting the light receiver and the light transmitter, and an element for distinguishing between smoke and other foreign bodies which are located in an area around the scattering point.

Abstract: A method and apparatus is provided for detecting airborne particles in an electronic enclosure. The electronic enclosure may be used to house one or more electronic devices or components of an electronic system, such as a computer or data storage system. A particle detection system is provided to monitor the air within the enclosure and to generate an alarm signal in response to detection of a threshold level of airborne particles within the enclosure that is indicative of an operational anomaly associated with at least one of the electronic devices or components. In response to the alarm signal, the electronic devices housed within the enclosure may be automatically shut down to reduce potential damage to at least the devices housed within the enclosure. The detection system is particularly suited for detecting the presence of smoke within an electronic enclosure, such as may be generated during a combustion event by overheated or electrically shorted electronic components.

Abstract: A self-contained smoke detector system has internal self-diagnostic capabilities and accepts a replacement smoke intake canopy (14) without a need for recalibration. The system includes a microprocessor-based self-diagnostic circuit (200) that periodically checks sensitivity of the optical sensor electronics (24, 28) to smoke obscuration level. By setting tolerance limits on the amount of change in voltage measured in clean air, the system can provide an indication of when it has become either under-sensitive or over-sensitive to the ambient smoke obscuration level. An algorithm implemented in software stored in system memory (204) determines whether and provides an indication that for a time (such as 27 hours) the clean air voltage has strayed outside established sensitivity tolerance limits. The replaceable canopy is specially designed with multiple pegs (80) having multi-faceted surfaces (110, 112, 114).

Abstract: An improved self-cleaning oven (10) is provided having an assembly (12) to control the cleaning cycle time of the oven (10) depending upon the degree of oven contamination and soil present therein. The assembly (12) includes a measuring chamber (16) as well as a passageway (18) communicating the interior (14) of the oven (10) and the chamber (16). A smoke detector (32) (preferably an infrared smoke detector) is associated with the chamber (16) and is coupled with a controller (20) so as to measure a parameter of smoke passing through the chamber during at least a portion of the cleaning cycle. This parameter is then used to determine the proper duration of the cleaning cycle. In preferred forms, measuring chamber (16a) is equipped with an ambient air inlet (52) and outlet (54) so as to draw an ambient air stream through the chamber (16a) between the smoke detector (32) and the oven gas stream.

Abstract: A smoke detector includes a housing defining a dark chamber admitting test atmosphere. A light receiver is disposed within the chamber. A scatter emitter is positioned within the chamber such that light strikes the receiver when reflected off particles suspended in the test atmosphere. An obscuration emitter is positioned within the chamber such that light emitted is directed to the receiver unless obstructed by particles suspended in the test atmosphere. A smoke detect signal is generated responsive to a measurement made responsive to the scatter emitter and/or the obscuration emitter.

Abstract: A smoke detector that is easily attached to the limb of a Christmas tree that includes a smoke detector circuit and an audible alarm circuit for generating an audible alarm in response to detecting smoke. The smoke detector circuit is capable of detecting small amounts of smoke and triggering an alarm. An additional fire detector element is also provided in the form of an infrared detector that detects rapid changes in infrared levels and generate an activation signal for causing the speaker to generate an audible alarm. The housing of the smoke detector has a Christmas decoration theme so as to not detract from the decorations on the Christmas tree.

Abstract: A smoke detector has a geometry that locates a sensor or sensors at or near a boundary layer of smoke movement thus facilitating smoke entry into the sensor and/or sensors. The sensors are mounted so as to protrude from the bottom of a cover instead of into the cover of the detector.

Abstract: A smoke detector that is insensitive to moisture, such as for use in aircraft cargo bays and the like, is provided. The smoke detector includes a housing defining a chamber that is sealed from outside light sources yet is capable of receiving smoke. The smoke detector also includes a light source that is positioned inside the chamber and a detector for receiving diffusely scattered light within the chamber. Advantageously, the smoke detector also includes a moisture compensating device that reflects a substantially consistent percentage of light incident thereupon regardless of moisture on the surfaces thereof such that the operation of the light source can be reliably tested even in environments where moisture has condensed or otherwise collected on the walls of the housing.

Abstract: A sounder assembly comprising a housing, means for providing a sounder plate; a base for attaching the sounder assembly to a support surface, and an electrical sounder mounted generally within the housing, the arrangement being such that, in use, the sounder plate is spaced from the housing and is located between the housing and the support surface, with the electrical sounder facing the sounder plate such that sound is generated towards the sounder plate and is directed away from the housing so that the sound emerges generally laterally of the sounder plate, and wherein the sounder plate is concave and the center of the electrical sounder is displaced from the center of the sounder housing.

Abstract: A smoke alarm having both an ionization detector and a photoelectric detector coupled to each other to generate an alarm signal when either of the detectors senses a potential fire. The smoke detector includes a power supply circuit having both an AC power supply and a DC battery power supply. During normal operating conditions, the AC power supply operates both the ionization detector and the photoelectric detector of the smoke alarm. Upon power interruption, the DC battery supply provides power to operate both the ionization detector and the photoelectric detector. The smoke alarm includes an interconnect that allows multiple smoke alarms to be coupled together.

Abstract: A smoke detection system comprising video camera monitoring means, video frame comparison means, signal processing means, and alarm generating means dependant on an output from the signal processing means; the signal processing means being arranged to analyse successive frames acquired by the video camera monitoring means and to compare the intensity and/or colour of individual pixels or group of pixels so as to consider the overall characteristics and inter-relationships of these pixels so as to detect the presence of smoke characterised in that the signal processing means analyses a plurality of different types of change in the said characteristics and inter-relationships.

Abstract: A photoelectric smoke detector includes a photoelectric chamber having a housing fabricated from an electrically conductive material.

Abstract: An energy efficient, easily manufacturable, multi-sensor detector incorporates a smoke sensor and a thermal sensor. A single die programmed processor with integrally formed storage circuits for programs and parameters senses sensor signals, from different types of sensors, during a common activation cycle and processes those signals during the same cycle. The processor can also monitor the condition of an energy supplying battery and provide modulation signals to an audible output device. Other detector functions can be interleaved between output device modulation signals to minimize the cost of the programmed processor and thereby provide the required functionality very cost effectively.

Abstract: An improved self-cleaning oven (10) is provided having an assembly (12) to control the cleaning cycle time of the oven (10) depending upon the degree of oven contamination and soil present therein. The assembly (12) includes a measuring chamber (16) as well as a passageway (18) communicating the interior (14) of the oven (10) and the chamber (16). A smoke detector (32) (preferably an infrared smoke detector) is associated with the chamber (16) and is coupled with a controller (20) so as to measure a parameter of smoke passing through the chamber during at least a portion of the cleaning cycle. This parameter is then used to determine the proper duration of the cleaning cycle. In preferred forms, measuring chamber (16a) is equipped with an ambient air inlet (52) and outlet (54) so as to draw an ambient air stream through the chamber (16a) between the smoke detector (32) and the oven gas stream.

Abstract: A control device and method provides control of at least one operating feature of a cooking device in response to measured smoke and/or gas produced by item(s) being cooked. The device and method may control the temperature and cooking time of the device, and may also shut off the device or provide a fire alarm.

Abstract: A smoke detector includes a housing defining a dark chamber admitting test atmosphere. A light receiver is disposed within the chamber. A scatter emitter is positioned within the chamber such that light strikes the receiver when reflected off particles suspended in the test atmosphere. An obscuration emitter is positioned within the chamber such that light emitted is directed to the receiver unless obstructed by particles suspended in the test atmosphere. A smoke detect signal is generated responsive to a measurement made responsive to the scatter emitter and/or the obscuration emitter.

Abstract: A compact particle sensor for detecting suspended particles includes a housing, a light source, a light receiver and a plurality of optical elements. The housing provides a test chamber and includes at least one opening for admitting particles into the test chamber, while simultaneously substantially preventing outside light from entering the test chamber. The light source is positioned for supplying a light beam within the test chamber. The plurality of optical elements are positioned to direct the light beam from the light source to the receiver, which is positioned to receive the light beam supplied by the light source.

Abstract: An alarm signaling device (5) operable to produce an alarm signal and, possibly, communicate emergency announcements when triggered by a signal from a central alarm control panel. The alarm includes a speaker or other sound producing device and a silencing circuit (14) that can be engaged by a person in the room to temporarily disable the speaker. The silencing circuit includes a timing circuit (30) and a switch (32) consisting of a pair of touch contacts (38, 40) that are activated by body resistance. The timing circuit (30) is operable to automatically re-enable the speaker after a predetermined time period has been measured. Furthermore, though the speaker has been silenced by the silencing circuitry (14), a reactivation circuit (15) continues to receive and process signals in order to identify a re-enablement signal by its particular frequency and duration.

Abstract: A fire detector which can be observed an operating state thereof from every direction and decrease a cost thereof as possible. The fire detector (10) comprises: the circuit board (32) in which the circuit for detecting a fire is formed; the LED (35) which is surface-mounted on the circuit board (32); and the indication lamp for indicating the fire detector being under detection by emitting the light emitted from the LED (35), wherein the indication lamp comprises the light guide member (20) for introducing the light emitted from the LED (35) to the indication lamp with a ring shape, the light guide member (20) comprises the light incident parts (21) and (21) and the ring member (22), notches (23) and (23) are formed in the vicinity of the light incident parts (21) and (21) of the ring member (22), and a plurality of small grooves (24), and (24) . . . are formed in the bottom surface (22d) of the ring member (22).

Abstract: The present invention is directed to a system and method for accessing home monitoring devices remotely via a distributed wide-area network (WAN). More specifically, the present invention is directed towards smoke detector system, which monitors for the presence of smoke and communicates the smoke condition to a remote location. The smoke detection system comprises a smoke detection device connected to a communication device. The smoke detection device outputs a signal or a change in a signal upon detection of smoke. This signal or change in signal is monitored by the communication device. The smoke condition is then communicated to the remote central location via a message system.

Abstract: A smoke detector includes a housing defining a dark chamber admitting test atmosphere. A light receiver is disposed within the chamber. A scatter emitter is positioned within the chamber such that light strikes the receiver when reflected off particles suspended in the test atmosphere. An obscuration emitter is positioned within the chamber such that light emitted is directed to the receiver unless obstructed by particles suspended in the test atmosphere. A smoke detect signal is generated responsive to a measurement made responsive to the scatter emitter and/or the obscuration emitter.

Abstract: A photoelectric smoke detector includes a smoke detecting section defining a smoke detecting space, a light emission section holder having a light-emission element disposed in the smoke detecting section, and a light receiving section holder having a light-receiving element disposed in the smoke detecting section. The light-receiving element receives light which has been emitted from the light-emission element and is scattered by smoke flowing in the smoke detecting space. A hybrid circuit board has an integrated circuit mounted thereon and is housed in the light receiving section holder. The integrated circuit including the light-receiving element and at least a received-light signal amplifying circuit. The hybrid circuit board is arranged so that the light-receiving surface of the light-receiving element is directed toward the smoke detecting space.