Strobe notification appliance

A notification appliance is disclosed. The notification appliance may be a strobe notification appliance, such as an LED strobe notification appliance. The notification appliance may be wall-mounted or ceiling-mounted. Further, the notification appliance may include an optic that is configured to shape the light output from the notification appliance. For example, in a wall-mount, the optic may be mounted off-axis of a plane defined by a back plate of the notification appliance. Further, the notification appliance may be composed of a back plate, a driver board, and a front housing, with the front housing being attached to one or both of the back plate and the driver board. Moreover, the notification appliance may be used with an adapter bracket, which may be used to connect the notification appliance with one or more types of junction boxes.

TECHNICAL FIELD

This application generally relates to notification appliances for a fire alarm system, and more specifically to an LED strobe notification appliance in a fire alarm system.

BACKGROUND

Fire alarm devices such as audible horns (audible/visible or A/V), loudspeakers (speaker/visible or S/V) and visible strobes (visible only or V/O), are referred to as “notification appliances.” Typically, a fire alarm control panel (FACP) drives these devices over one or more “notification appliance circuits” (NACs). The strobes are used, for example, as an alert for the hearing-impaired, or for those in a high noise environment.

One type of strobe uses a flash tube (also called a flash lamp). Typically, the flash tube is an electric glow discharge lamp designed to produce extremely intense, incoherent, full-spectrum white light for very short durations. Flash tubes are made of a length of glass tubing with electrodes at either end and are filled with a gas that, when triggered, ionizes and conducts a high voltage pulse to produce the light. Xenon is an example of the gas that can fill the flash tube, with a Xenon flash tube producing a high-intensity light (such as hundreds of thousands of lumens) for a very short duration pulse (such as hundreds of milliseconds). Xenon flash tubes use a high voltage storage element, such as an electrolytic capacitor, that can be charged several hundred volts to provide energy for the flash. Xenon flash tubes also use a trigger voltage that is in the several thousand volt range to start the gas discharge.

The lifetime of the flash tube can depend on both the energy level used for the lamp in proportion to its discharge energy, and on the pulse duration of the lamp. Failures can be catastrophic or can be gradual, reducing the performance of the lamp below a usable rating.

Another type of strobe is Light Emitting Diode (LED)-based. An LED-based strobe includes an LED that is high power, and greater than typical display LEDs. However, even with a high power LED, the LED-based strobe cannot generate light at as high of an intensity as a Xenon-based strobe. Instead, LED-based strobes generate a lower intensity light (such as hundreds of lumens) for a longer period of time (such as tens to hundreds of milliseconds). In this way, the LED-based strobes can generate a comparable amount of light energy, as measured in candela, as a Xenon-based strobe. In contrast to flash-tube based strobes, LED-based strobes typically have a longer usable lifetime.

SUMMARY

In one aspect, a notification appliance is disclosed. The notification appliance includes: a back plate configured to abut a junction box; a driver board connected to the back plate; a front housing connected to the back plate; one or more LED strobe elements electrically connected to the driver board; and an optic configured to shape light generated by the one or more LED strobe elements, the optic in a predetermined configuration with respect to the one or more LED strobe elements, wherein the driver board is configured to drive the one or more LED strobe elements, and wherein the driver board is mounted between the back plate and the front housing.

In another aspect, a notification appliance is disclosed. The notification appliance includes: a back plate configured to abut a junction box, the back plate includes a hole, the junction box including a screw receptacle; a driver board connected to the back plate and including a hole; a front housing comprising a screw opening; one or more LED strobe elements electrically connected to the driver board; and an optic configured to shape light generated by the one or more LED strobe elements, the optic abutting the front housing, wherein the driver board is configured to drive the one or more LED strobe elements, wherein the driver board is mounted between the back plate and the front housing, and wherein the screw opening in the front housing, the hole in the driver board and the hole in the back plate are configured such that when a screw traverses the screw opening in the front housing, the hole in the driver board and the hole in the back plate and engages the screw receptacle in the junction box, the front housing is configured to press the driver board against the back plate.

In still another aspect, a method is disclosed. The method is for attaching a notification appliance to a junction box, the junction box including a plurality of screw receptacles configured to receive screws. The method includes: screwing screws only partly into the screw receptacles of the junction box; attaching wires from the junction box to a terminal block of the notification appliance; looping the partly screwed screws through keyholes of a front housing of the notification appliance; and fully screwing the screws into the screw receptacles of the junction box.

DETAILED DESCRIPTION

A system embodying one example of the present invention is illustrated inFIG. 1. The system includes one or more notification appliance circuits (NACs), e.g., networks16, having alarm condition detectors D and alarm system notification device A. Alternatively, the detectors and notification devices may be on separate networks. A system controller (such as a fire alarm control panel (FACP))14may monitor the detectors D.

The system controller14may monitor the alarm condition detectors D. When an alarm condition is sensed, the system controller14may signal the alarm to the appropriate notification appliances A through the one or more appliance circuits. Notification devices may include, for example, a visual alarm (such as a strobe), an audible alarm (such as a horn or a speaker), or a combination thereof.

Although not necessary for carrying out the invention, as shown, all of the notification devices in a network are coupled across a pair of power lines18and20that advantageously also carry communications between the system controller14and the detectors D and notification devices A.

The system controller14may comprise a fire alarm control panel and may use one or more commands to signal the alarm to the appropriate notification appliances A. Examples of commands issued for a system with addressable notification appliances are disclosed in U.S. Pat. No. 6,426,697, which is hereby incorporated by reference in its entirety. Alternatively, the communication line to the device may be separate from the power line. In still an alternative embodiment, the system may include non-addressable notification appliances. The communications channel may comprise, for example, a wireless link, a wired link or a fiber optic link.

Further, the system controller14may send one or more commands relating to diagnostics, status, or other non-alarm type events. For example the system controller14may send a command related to the identification, the configuration, and/or the status of the notification appliances A. Moreover, the notification appliances A may respond in kind.

FIG. 2is a schematic diagram of a part of the system shown inFIG. 1, further illustrating details of the system controller14and one of the notification appliances. The system controller14includes a processor36, a memory38, a user interface40, and a device interface42. The processor36may comprise a microprocessor, a microcontroller, a digital signal processor, an application specific integrated circuit (ASIC), a field programmable gate array, a logical digital circuit, or other now known or later developed logical processing capability. The processor36may work in combination with the memory38in order to monitor part or all of the fire alarm system, including one or more of the appliance circuits (such as one or more notification appliance circuits, one or more detector circuits, and/or one or more notification appliance/detector circuits). In addition, the memory may include one or more look-up tables (or other data structures) used for configuration.

User interface40may be used by an operator to control configuration and/or operation of the alarm condition detectors D and alarm system notification appliances A. And, device interface42may be an example of a communications interface, and may comprise the interface between the system controller14and the alarm condition detectors D and alarm system notification appliances A in the one or more appliance circuits.

FIG. 2further depicts a strobe device30in greater detail. The strobe device30connects to the network16via a network interface (communication connection)24. The strobe device30receives one or more commands from the system controller14. The controller26processes the one or more commands, as discussed in more detail below. Although shown separately, the memory32may be integrated with the controller26.

The strobe device30further includes LED strobe element and associated circuitry44. In some embodiments, in addition to an LED-based strobe element, another output light source may be present. For example, an indicator34, such as a flashing LED (separate from the LED strobe element and associated circuitry44), may be used as a visual output, for example during diagnostic testing, on the strobe device30. The indicator34may be activated, for example, upon command from the system controller14, upon a local manual command such as a pushbutton (not shown). In this regard, the strobe device30may include one or more strobe LEDs (shown inFIG. 2as LED strobe element and associate circuitry44) and one or more communication LEDs (shown as indicator34).

After the controller26determines to activate the LED strobe element, the controller26sends one or more control signals to LED strobe element and associated circuitry44in order to control the operation of the LED strobe element. One example of an LED-based strobe element is disclosed in U.S. Patent Application No. 2008/0272911, herein incorporated by reference in its entirety.

The strobe device30may optionally include candela selector46and configuration selector48. Candela selector46may be an input device, such as a multi-position switch, on the strobe device30. An example of the multi-position switch is disclosed in U.S. Pat. No. 7,456,585, incorporated by reference herein in its entirety. Examples of candela settings include 15, 30, 75, and 110. Configuration selector48may also be an input device to configure strobe device30. Configuration selector48may comprise a multi-position switch and may input the address of the strobe device, may input the grouping of the strobe device (see for example, U.S. Published Application No. 2012/0154160, incorporated by reference herein), may configure the horn, etc. As discussed in more detail below, the configuration selector48may be located on a front side (such as shown inFIG. 13A) or a side of the strobe device30(sides of the strobe device are shown inFIGS. 6A-C). Optionally, the configuration selector may be positioned on a backside of the strobe device (the side that abuts the wall) or may be positioned on a top side of the strobe device.

One, some, or all of the notification devices A may comprise a strobe device, a strobe/horn device, a strobe/speaker device, or the like. As discussed herein, a strobe device may include strobe functionality (such as LED strobe functionality) or may include strobe functionality and additional notification functionality (such as horn or speaker functionality). The strobe device may be an addressable strobe notification device (e.g., the strobe notification device has a uniquely assigned address) or a non-addressable strobe notification device.

FIG. 3illustrates an expanded block diagram of the strobe device illustrated inFIG. 2. The network interface24includes a strobe power control input60that receives the command to activate the strobe device30and receives power to power the strobe device30. The strobe power control input60sends the received command to the LED flash circuit controller26. The LED flash circuit controller26includes LED control drive58and flash timing control62, which controls the timing of the flashes of the LED strobe element. The flash timing control62may receive as an input the candela selector46, which may input the candela setting. Based on the candela setting, the flash timing control62may control the strobe element and associated circuitry44to generate an output with the desired candela setting. One example of the strobe element and associated circuitry44is illustrated inFIG. 3, which includes an LED flash circuit56, a power conversion circuit52, and energy storage circuit54. The power conversion circuit52provides the proper regulated voltage to the energy storage circuit54. An example of the power conversion circuit52may be a voltage regulator (such as a DC-DC converter or current regulator), and an example of the energy storage circuit54may be a capacitor. The flash timing control circuit62generates an output to the LED control drive58. Based on the output, the LED control drive58provides the proper current to the LED flash circuit56in order for the LED flash circuit56to generate the desired intensity. Further, the flash timing control62generates an output to LED flash circuit56, which dictates the duration of the output of the LED flash circuit56. Thus, the flash timing control62may control both the intensity and the duration in order generate an output with the requested candela rating (as dictated by candela selector50) and at the fixed pulse width. The flash timing control62further may communicate with the power conversion circuit52in order for the power conversion circuit52to provide the proper voltage to energy storage circuit54.

Thus, upon receiving the activation signal (such as in the form of a command received by network interface24), the power conversion circuit52may charge up the storage capacitor in energy storage circuit54. Alternatively, the power conversion circuit54may charge up the storage capacitor in energy storage circuit54prior to receipt of the activation signal. Regardless, the strobe element may be activated in response to receipt of the activation signal. When the strobe element is activated, the flash timing control62may initialize the power conversion circuit52to charge the energy storage circuit54, as well as configure the LED control drive58. This may be applicable to a notification appliance that is addressable. In a non-addressable notification appliance, the flash timing control may be set directly (such as locally on the non-addressable notification appliance).FIG. 3further includes the configuration selector48. The LED flash circuit controller26may poll the configuration selector48in order to determine one or more settings of the configuration selector48. As discussed above, the configuration selector48may be configured to input a unique address, a grouping, or the like.

Various standards may be promulgated for strobe devices. One such standard in Underwriting Laboratories (UL) Specification 1971, which relates to requirements that cover emergency-signaling devices for the hearing impaired.FIGS. 4A-Dillustrate various requirements for wall mounted strobe devices. For example,FIG. 4Aillustrates the required minimum percentage in US Specification 1971 for horizontal dispersion for a wall mounted strobe. As shown, on axis (0°) requires a 100% rating output. As the angle increases off-axis, the percent rating decreases.FIG. 4Billustrates the light output with regard to horizontal dispersion and the various angles depicted inFIG. 4A.FIG. 4Cillustrates the required minimum percentage in US Specification 1971 for vertical dispersion for a wall mounted strobe.FIG. 4Dillustrates the various angles listed in the chart depicted inFIG. 4C.

FIGS. 5A-Billustrate various requirements for ceiling mounted strobe devices.FIG. 5Aillustrates the required minimum percentage in US Specification 1971 for vertical dispersion in both X and Y planes for a ceiling mounted strobe.FIG. 5Billustrates the light output with regard to vertical dispersion and the various angles depicted inFIG. 5A.

FIG. 6Ais an exploded view of various parts of the LED notification device600. The LED notification device600may be configured for mounting to a wall, and may be configured to generate a strobe output. The notification device600includes an optic604that is attached to front housing610via one or more screws, bolts or fasteners602. When optic604is attached to front housing610, the LED printed circuit board (PCB)608is sandwiched between the optic604and the front housing610. As shown inFIG. 6A, LED PCB608includes a notch606, discussed in detail below with respect toFIG. 6J. Further, LED PCB608includes 2 LEDs. Different numbers of LEDs, such as 4 LEDs, are contemplated.

FIG. 6Afurther illustrates cover641that may sit over a movable switch612, which may be moved to one of a plurality of positions to indicate the candela setting for the strobe device600. Switch612is an example of candela selector46illustrated inFIG. 2.FIG. 6Aalso includes main PCB614, which is discussed in further detail inFIGS. 14A-B. Connector620is configured to electrically connect LED PCB608with main PCB614.

Main PCB614may comprise the driver board. As discussed in more detail below, the driver board may be configured to drive one or more electronics on main PCB614or on other boards. For example, main PCB614may include a speaker (such as speaker1010illustrated inFIG. 10A). Main PCB614may include electronics to drive speaker. As another example, main PCB614may drive one or more LEDs (such as LED(s) illustrated in LED PCB608).

As illustrated in the exploded view ofFIG. 6A, main PCB614may be connected to back cover616. For example, main PCB614may be connected to back cover616via a snap-fit. More specifically, back cover616may include one or more structures used to engage main PCB614, such as one or more tabs and/or one or more snaps. In a more specific embodiment, back cover616includes tab639, so that a part of main PCB614, such as one side of main PCB614, may slot into tab639. Further, back cover616may include snaps635,637, which may snap onto the front of main PCB614. As another example, main PCB614may be connected to back cover616via one or more screws. Back cover616, in turn, is configured to connect with a junction box, as discussed in more detail below.

In one embodiment, front housing610may likewise be connected to back cover616. Thus, the front cover610is connected directly to back cover616(instead of in a separate embodiment in which the front cover is indirectly connected to main PCB614, which is in turn connected to back cover616). Using the direct connection to the back cover616, the front housing610may be more securely fastened. Similar to main PCB614, front housing610may be connected to back cover in one of several ways, including via snap-fit or via one or more screws. For example, back cover may include an opening633, into which a tab on the front housing610may slot into. As another example, back cover616may include holes629,631, into which tabs on the front housing may fit into, as discussed in more detail below. In this regard, in one embodiment, the main PCB614and the front housing610may both be connected to the back cover616in a similar manner (e.g., via a snap fit). Alternatively, the main PCB614and the front housing610may be connected to the back cover616in different manners.

Though not illustrated inFIG. 6A, an escutcheon may be attached to front housing610(such as via a snap fit, discussed in more detail below). For example, front housing610may include snaps627,628, into which the escutcheon may attach. In one embodiment, the front housing610includes four snaps equally spaced, such as spaced at noon, 3 o'clock, 6 o'clock, and 9 o'clock (with snap628illustrating the positioning at noon and snap627illustrating the positioning at 3 o'clock). In an alternate embodiment, the front housing610includes two snaps equally spaced, such as spaced at noon and 6 o'clock.

The front housing610and/or main PCB614may be connected to back cover616in one or more additional ways. As discussed in more detail below, the notification appliance600may be connected to a junction box via one or more screws. In this regard, the screws may screw through holes603,605in the front housing610, holes607,609in the main PCB614, and holes621,623in back cover616to be received in screw sockets of the junction box (such as holes1224,1228, which serve as screw receptacles, in junction box1220). In order for the screws not to touch main PCB614(and potentially short circuit main PCB614), protrusions621,623on back cover616are used. Protrusions621,623may be composed on non-conducting material, such as rubber. When main PCB614is attached to back cover616, protrusions621,623push through holes607,609so that the interior edge of holes607,609are covered by protrusions621,623. In this regard, protrusions621,623serve as a buffer so that screws do not touch the interior edge of holes607,609. Further, an underside of front housing610may have one or more surfaces that mate with protrusions621,623. For example, the area on an underside of the front housing610around keyholes1308,1310may mate with protrusions621,623. The area(s)1360,1362, highlighted by dashed circles inFIG. 13F, may be flat surfaces. Thus, the screws inserted into the junction box, which traverse through the front housing610, the main PCB614, and the back cover616, may be isolated from interior electronics of the notification appliance.

When the screws are received in the screw sockets, the front housing610is pushed into main PCB614and back cover616, so that the front housing610creating a pressing force onto main PCB614and back cover616. With the additional manner in which front housing is connected to the notification appliance600, the notification appliance600may have additional structural integrity.

Main PCB614may include jumper611. Jumper611may comprise a wire used to configure Main PCB614. Jumper611may be visible from the front of notification appliance (with the escutcheon removed), such as illustrated inFIG. 13A, discussed below. In this regard, the technician may readily see a configuration of Main PCB614by viewing front housing610without the need to remove front housing610.

Jumper may be input into different holes or points in main PCB614in order to indicate to the main PCB614(such as firmware resident in the main PCB614) of a particular desired configuration of the notification appliance. Jumper611may likewise be selected for a particular color to indicate the particular configuration of the notification appliance. In a more specific example, upon manufacture (or after manufacture), a jumper may be used to connect to a hole on main PCB614that indicates to the firmware that the notification appliance is to be configured as a mass notification appliance. As discussed in more detail below, the firmware may modify the operation of the notification appliance in response to the configuration information indicated by the jumper. In order to visually provide this indication, a yellow jumper may be used to indicate to an operator that the notification appliance is configured as a mass notification appliance. Conversely, a jumper may be used to connect to a hole on main PCB614that indicates to the firmware of the notification appliance that the notification appliance is to be configured as a fire notification appliance, with the color of the jumper being white to indicate to the operator that the notification appliance is configured as a fire notification appliance. In this regard, jumper611may serve one or more purposes. In one purpose, jumper611provides a visual indication of the configuration of the notification appliance. In another purpose, jumper611is used by main PCB for the configuration.

As discussed above, jumper611provides configuration information to the firmware. The firmware may modify the operation of the notification appliance in response thereto. In the example of jumper611indicating that the notification appliance is configured for mass notification (which can result in the light output being yellow in color), the firmware may drive the LED(s)622differently than if the firmware determines that the mass notification appliance is configured for fire notification. More specifically, since the light output for mass notification is yellow in color (with the yellow light output potentially resulting from filtering, thereby reducing the spectrum of light output as compared to light output for fire notification), the firmware may drive the LED(s)622differently (e.g., at a greater current and/or at a higher PWM rate) in a mass notification configuration than for a fire notification appliance in order to meet the desired candela setting. For example, for a setting of 30 candela, the firmware may drive a notification appliance in a fire notification configuration at a lower drive current and/or at a lower PWM rate than a 30 candela setting for a notification appliance configured for mass notification. As discussed below, the firmware may determine the drive currents and/or the PWM rates for the different configurations based on a lookup table, which may correlate an indication of the drive currents and/or PWM rates at which to operate the one or more strobe LEDs with different configurations.

As discussed above, the notification appliance may be configured for a candela output. In one embodiment, the notification appliance is configured for a discrete number of candela outputs. Typical candela ratings include, but are not limited to, 15, 30, 75, and 110 candela. In a more specific embodiment, the configuration of the candela output for the notification appliance is via input proximate to the notification appliance (such as a manual setting of a switch, such as using cover641to manually set the candela output or via a near-field communication to the notification appliance). In another specific embodiment, the configuration of the candela output for the notification appliance is via input remote to the notification appliance (such as by the fire alarm control panel sending a command to configure the notification appliance to the candela output).

Further, in one embodiment, all of the potential candela outputs may be available in each of the different configurations of the notification appliance. For example, if the potential candela outputs are 15, 30, 75, and 110 candela, the notification appliance may output all of the potential candela outputs in either a fire notification configuration or in a mass notification configuration.

In an alternative embodiment, the potential candela ratings may be different depending on the configuration of the notification appliance. As discussed above, a fire notification appliance may use a clear lens and may emit a broad spectrum of light. Other types of notification appliances, such as a mass notification appliance, may have a colored lens and may emit a narrower spectrum of light. Because of the narrower spectrum, the notification appliance in the mass notification configuration may emit less light than the notification appliance in the fire notification configuration (with the drive current and PWM rate being equal). In certain configurations (such as in the mass notification configuration), the notification appliance may be unable to generate sufficient light to meet the candela requirements, such as at the highest candela setting (e.g., 110 candela). More specifically, the notification appliance may be unable to generate the drive current for a sufficient period of time to meet the candela setting at the narrower spectrum of light. In these situations, the notification appliance may have different available candela settings for different configurations. In the example of available candela settings of 15, 30, 75, and 110 candela, the notification appliance in the fire notification configuration may be configured to any of the available candela settings of 15, 30, 75, and 110 candela, whereas in the mass notification configuration may be configured to any of the available candela settings of 15, 30, and 75 (but not at the 110 candela setting). In this regard, the notification appliance in the mass notification configuration has a narrow set of available candela settings than in the fire notification configuration.

Further, in one embodiment, a notification may be generated in the event of an error in the candela setting. For example, in the event that the notification appliance is set to an unavailable candela setting, the notification appliance may generate an error signal. More specifically, in a notification appliance in which the 110 candela setting is unavailable in the mass notification configuration, and in the event that the notification appliance is in the mass notification configuration and the desired candela setting is set to 110 candela (either via a switch on the notification appliance or via a command to configure the candela setting set by a fire alarm control panel), the notification appliance may generate an error indication. The error indication may be output locally (such as on a display resident on the notification appliance) and/or may be output remotely (such as sending a communication to the fire alarm control panel indicating the error).

In addition to (or instead of) notifying of an error in the candela setting, the fire alarm control panel may notify of an error in the configuration of the notification appliance. As discussed above, the jumper, indicating the configuration of the notification appliance to the main PCB614, may be installed at manufacture. After which, the notification appliance is installed at the site and the fire alarm control panel is programmed. The fire alarm control panel may thereafter poll one, some or all the notification appliances in the system for the respective configurations. For example, the fire alarm may send a command to a particular notification appliance, and, responsive to the command, the particular notification appliance may poll the jumper611to determine the configuration and send a response that includes an indication of the configuration, such as a mass notification configuration or a fire notification configuration. The fire alarm control panel may compare the configuration, as reported by the notification appliance, with the configuration, as programmed at the fire alarm control panel. In the event of a discrepancy in the comparison, the fire alarm control panel may indicate an error. For example, the fire alarm control panel may have programmed therein that notification appliance #20is a fire notification appliance. In response to the fire alarm control panel polling notification appliance #20, the notification appliance may receive the configuration of notification appliance #20. In the event that notification appliance #20responds with configuration information indicating a mass notification appliance, the fire alarm control panel may indicate an error. In this regard, the fire alarm control panel may perform testing to ensure that the proper equipment is installed.

As discussed above, the firmware may access the drive settings and/or PWM rates for the LED(s)622depending on the configuration and the candela setting of the notification appliance. In one example, a 2-dimensional look-up table may be used in order for the firmware to determine the correct drive currents and/or PWM rates. More specifically, inputs to the look-up table may include: (1) the notification appliance configuration (e.g., fire or mass notification configuration); and (2) the candela setting (e.g., 15, 30, 75 or 110). Responsive to the inputs, the look-up table may output an indication as to the drive current and/or PWM rate at which to operate the one or more strobe LEDs. For example, the look-up table may output an indication of a drive current, which may be used to drive the one or more strobe LEDs at the indicated drive current. In one embodiment, the look-up table may be resident in the notification appliance upon manufacture. In an alternate embodiment, the indication of the drive current and/or PWM rate may be received from a device external to the notification appliance. For example, responsive to receiving the notification appliance configuration and optionally the candela setting, the fire alarm control panel may send the notification appliance the drive current and/or PWM rate to produce the desired candela output for the notification appliance configuration. More specifically, in the instance where the candela setting is input locally to the notification appliance, the notification appliance may send both the notification appliance configuration and the candela setting to the fire alarm control panel. In response thereto, the fire alarm control panel may send the drive current and/or the PWM rate. In the instance where the candela setting is input via a command from the fire alarm control panel to the notification appliance, the notification appliance may send only the notification appliance configuration to the fire alarm control panel. In response thereto, the fire alarm control panel may send the indication of the drive current and/or the PWM rate.

FIG. 6Bis a back view of LED notification device as assembled.FIG. 6Billustrates wire connecting mechanism618, discussed below with respect toFIGS. 9B-D.FIG. 6Bfurther illustrates inset619. Inset619comprises an indentation, cutout, or channel in the back of back cover616. Inset619may completely encircle a center portion of back cover. Adapter bracket1200, discussed below with respect toFIGS. 12A-B, may mate with inset619. In one embodiment, when adapter bracket1200is pressed against the back of back cover616, adapter bracket sits flush with the back of the back cover. For example, another portion of back cover616, such as at617, and the adapter bracket may be in the same plane. In this regard, when adapter bracket1200connects between notification appliance and junction box, the notification appliance may at least partly abut or touch junction box. In one embodiment, the adapter bracket1200mating with inset619at least partly seals or weatherproofs a backside of the notification appliance. In an alternate embodiment, the adapter bracket1200mating with inset619fully seals or weatherproofs the backside of the notification appliance.

As discussed above, front housing610may be attached to back cover616. Slot643illustrates one manner in which front housing610may be attached to back cover616. Further, the escutcheon may be attached to front housing610, such as using tabs645,647,649,651on front housing.

FIGS. 6C-Eillustrate side views of a wall mounted notification device, withFIG. 6Cillustrating the notification device without the optic attached andFIG. 6Dillustrating the notification device with the optic attached.FIG. 6Eillustrates an expanded view ofFIG. 6D.FIG. 6Fillustrates a cross-section view of the optic as installed.

As discussed above, there may be requirements for a vertical dispersion of wall mounted strobes, such as illustrated inFIGS. 4C-D. In this regard, one manner in which to achieve a desired vertical dispersion is by configuring the notification device such that one or more of the LED strobe elements in the notification device is offset. As illustrated inFIGS. 6C-E, the LED strobe element in the notification device is offset at 25° below the vertical plane. Typically, the LED strobe element is positioned such that its mounting is perpendicular to the wall (i.e., 0° from vertical). In one embodiment, the angle of mounting is greater than 0°, such as equal to or greater than 5°, equal to or greater than 10°, equal to or greater than 15°, equal to or greater than 20°, equal to or greater than 25°, equal to or greater than 30° or equal to or greater than 35°.

There are various ways in which to achieve the desired angle of mounting of the strobe element. One way, illustrated inFIG. 6D, is to mount the one or more LED(s)622, being used as the strobe element, perpendicularly onto a printed circuit board (PCB), such as LED PCB608illustrated inFIG. 6A. In this regard, the light emitted at companion angles across 180° (such as 45° and 135°) are the same. The LED PCB608may then be mounted at the desired offset (such as at 25° discussed above) so that the light emitted from the LED(s) (after the PCB is mounted) is at the desired offset angle. Another way is to mount the LED PCB such that the LED PCB (when the notification device is mounted to the wall) is parallel to the wall. The LEDs may be mounted to the LED PCB at the desired offset (such as at 25°). Thus, when installed, the LED(s) are at the predetermined offset. Still another way is to offset the mounting of the PCB and the LED(s) related to the wall.

As discussed above, the optic may be used in the notification device. Examples of the optic are illustrated inFIGS. 6C-I,7A-B,8A-C,13,17A-B,19A-B and21A.FIG. 6Gillustrates a front view of the optic,FIG. 6Hillustrates a bottom view of the optic, andFIG. 6Iillustrates a front perspective view of the optic.

The optic604is configured to work in combination with one or more LEDs in order for the light to have a predetermined distribution. More specifically, the light, after emission through the optic installed at a certain angle below the vertical plane, such as 25° below the vertical plane (seeFIGS. 6C-D), has a distribution at least as much as listed inFIGS. 4A and 4C. In this regard, the optic is shaped on the interior portion (e.g., when installed the surface of the optic closer to the LEDs) and/or on the exterior portion to generate the desired light distribution.

The optic604further includes one or more structures in order to accomplish one or both of the following objectives: correctly position the optic relative to the LED PCB608; and correctly secure the LED PCB608to the notification device (such as to front housing610illustrated inFIG. 6A). The optic604includes one or more holes642configured to receive one or more screws, bolts or fasteners. The optic604may be placed on top of housing610(illustrated inFIG. 6A) and screws may be screwed through hole642, and through hole625on front housing610to affix optic604to front housing610. In this regard, when optic604is affixed to front housing610, LED PCB608may be pressed against front housing610(shown in exploded view inFIG. 6A). Further, the optic604includes one or more keys configured for proper orientation of the optic604. For example,FIGS. 6G and 6Hillustrate posts636and638. In one embodiment, posts636and638are in line with holes642, as illustrated by dotted line644.

Posts636,638may act as locating structure configured to properly position or locate optic604in notification appliance. As shown, post636has a diamond shaped cross-section and post638has a circular shaped cross-section. In addition, LED PCB608includes slots or openings (one opening with a diamond shape to receive post636and one opening with a circular shape to receive post638). In this regard, posts636and638ensure that the optic is in the proper orientation. More specifically, the optic604may be configured in a first orientation and a second orientation 180° from the first orientation. The posts636and638may be used to ensure a proper orientation. More specifically, in the event an operator attempts to install the optic604in an improper orientation (e.g., 180° out of alignment), the posts636and638will not fit properly into LED PCB608, thereby indicating that the selected orientation is not proper.

In addition, one or both of posts636and638may perform functions other than proper orientation. In one embodiment, one or both of posts636and638may be used as a light guide. In one more specific embodiment, one or both of posts636and638may be in light communication with at least another part of the notification appliance. More specifically, one or both of posts636and638may guide light generated from strobe LED(s) back to main PCB614. As discussed in more detail below, the light from the strobe LED(s) may be sensed by a circuit element on main PCB614in order to determine whether strobe LED(s) are operating correctly. In another more specific embodiment, one or both of posts636and638may guide light generated from a light source (such as a communication LED) on main PCB614to the optic. As discussed in more detail below, the optic may be used for multiple purposes, such as for shaping the light generated by the strobe LED(s), and also for outputting light from a communication LED. The communication LED may reside on main PCB614, and transmit its light via a light pipe and via the post so that the light from the communication LED is visible by a technician viewing the optic. This is, for example, illustrated inFIG. 8C, in which posts636or638may guide light generated from strobe LED to a light pipe704or802, and may also guide light generated by a communication LED to optic700or800.

Optic604may further include gate640. As discussed in more detail below, gate640may be used to locate optic with respect to LED PCB608(seeFIG. 6J). Similar to posts636or638, gate640may guide light to (or may receive light from) main PCB614. For example, gate640may guide light generated from strobe LED(s) back to main PCB614. As another example, gate640may receive light generated from a light source (such as a communication LED) on main PCB614to the optic.

As discussed above, the optic is configured to shape the light generated from the LED array into a light output distribution with at least a predetermined pattern. In this regard, a first optic may be used to shape the light output from a first LED array and a second optic may be used to shape the light output from a second LED array. For example, a 2×1 LED array may be mounted on the LED PCB (with 2 LEDs in a line). As another example, a 2×2 LED array may be mounted on the LED PCB (with 4 LEDs arranged in a square shape).

In one embodiment, the general shape of the optic (e.g., the footprint of the optic) used in combination with a first LED array is the same as the general shape of the optic used in combination with a second LED array. In the example given, the footprint of the optic for use with the 2×1 LED array is generally the same as the footprint for the optic for use with the 2×2 LED array. However, the optic used with the first LED array is different from the optic used with the second LED array in at least one aspect, such as the interior surface or the exterior surface. In the example given, the optic for the first LED array may have a different racetrack632or flange630. In one embodiment, for example, the racetrack632for the optic for use with the 2×1 LED array is wider than the racetrack632for the optic for use with the 2×2 LED array. Similarly, the gate640for the optic for use with the 2×1 LED array is longer than the gate640for the optic for use with the 2×2 LED array.

Given that there are multiple optics with the same footprint, there is a possibility that the wrong optic may be installed. In the example given, an optic designed for installation with a 2×1 LED array may be mistakenly installed with a 2×2 LED array. To avoid a mistaken installation of the wrong optic, a key634may be used. The key634may have a companion opening with the LED PCB. For example, an optic designed for installation with a 2×1 LED array may have a key634at 2:00 (as illustrated inFIG. 6G). The LED PCB (upon which the 2×1 LED array is installed) may likewise have an opening to receive the key634on the optic. As another example, an optic designed for installation with a 2×2 LED array may have a key at 10:00. The LED PCB (upon which the 2×2 LED array is installed) may likewise have an opening to receive the key on the optic.

The optic thus may be used to seal one or more parts of the notification appliance. In one way, the optic may be used to press LED PCB608against front housing610. In another way, the optic may be used to seal an opening on escutcheon. As discussed in more detail below, a part of the optic, such as racetrack632, may be used to seal an underside of escutcheon.

The optic includes a center portion, through which at least a part of the light generated from the mounted LED(s) is transmitted. Further, when mounted, the center portion of the optic is positioned proximate to and directly above the LED(s)622mounted to LED PCB608. Further, as shown inFIGS. 6G-I, the optic includes a shaped surface on the interior of the optic (i.e., when installed, the surface of the optic closer to the mounted LED(s)) and a shaped surface on the exterior of the optic. At least one of the shaped surfaces, such as the shaped surface on the interior of the optic, may comprise an asymmetrical shape. For example, the center portion of the optic is skewed such that a top portion shape is different from a bottom portion shape. Optic604further includes flange630, racetrack632, and gate640. Gate may be configured to abut or mate with a part of the LED PCB608, such as illustrated inFIG. 6J. In this regard, gate640may be used as an alignment guide. Alternatively, or in addition, gate640may guide light generated from strobe LED(s) back to main PCB614and/or may guide light generated from a light source (such as a communication LED) on main PCB614to the optic.

When the escutcheon is mounted to front face610, flange630is configured to seal with an underside of the escutcheon. This is discussed in more detail with respect toFIGS. 10C-D. In addition, it may be desirable that the optic604blends with the escutcheon. In this regard, the racetrack632may be configured so that it sits flush with an outer side of the escutcheon. To accomplish this, the amount of rise648between the flange630and the racetrack632may be selected such that the flange630seals the underside of the escutcheon and such that the racetrack632sits flush with the outer surface of the escutcheon.

Optic604may include flat surface646. As discussed above, wall mounted notification appliances have a desired distribution, such as illustrated inFIG. 4D. In order to reduce the light traveling upward, flat surface646is used. Flat surface is horizontal with respect to optic604. When optic is installed, such as illustrated inFIG. 6D, the flat surface is 25° from vertical.

Optic604further includes bends650,652which may comprise a curved portion configured to conform to a curve in front housing610.

As discussed above, the optic may be designed such that the optic's free form surfaces, including the shaped surface on the interior of the optic and/or the shaped surface on the exterior of the optic, may work in combination with the LED axis directed at 25° below the vertical plane. The luminous intensity distribution dictated by the UL specification in the vertical plane, shown inFIG. 4C, has a center weighting that is approximately 20° below the vertical plane. In this regard, if the LED axis is tipped further up or down from the 25° as illustrated, it may result in performance deterioration and may result in the optic thickness becoming too large to be molded.

One or more LED(s) may be housed in the notification device. In one embodiment, a single LED may be housed in the notification device. In an alternate embodiment, multiple LEDs may be housed in the strobe device. The multiple LEDs may be arranged in an array, such as a 2×1 array, a 2×2 array, etc. One example of an LED is Cree XM-L2 LED.

In the embodiment in which multiple LEDs are positioned proximate to one another, the extreme angle rays from either one of the LEDs are incident on the adjacent LED lens dome. This modifies the overall directional output characteristics.

FIG. 6Jillustrates LEDs side by side (e.g., 2 LEDs side by side). The side by side LED configuration may be effective because in the horizontal plane where the effective source size is largest the rate of change of illumination is relatively small and in the vertical plane where the rate of change of illumination is much larger the effective source size is relatively small. With regard to horizontal beam distribution, the output of the strobe device that is configured for wall mounting is designed to meet or exceed the UL 1971 specification requirements as illustrated inFIG. 4A. To ensure that the output at 90° meets the required 25% of peak value (seeFIG. 4A), some light is directed at angles greater than 90°. This extra coverage is a consequence of the emitting size of the LED. There is also a deliberate excess of light above the requirement at 90° to allow for the effect of positional tolerances which have a greater effect at 90° than on the axis.

Further, optic604may be designed to be attached to the strobe device in fixed relation to the one or more LED strobes. Optic604has a shaped inner surface, a shaped outer surface, and a predetermined distance between the inner and outer surfaces in order to distribute the light from the LEDs such that the output from the LEDs is at least (or exceeds) the UL 1971 specifications as detailed inFIGS. 4A-D(for wall mounted strobe devices) and inFIGS. 5A-B(for ceiling mounted strobe devices). At least a part of the optic, such as the flange630and/or the racetrack632, may further be configured to act as a seal around the LED(s). The optic may be composed of Polycarbonate or other material with a predetermined refractive index (e.g., a high refractive index) that improves the amount of light that can be gathered by the optic.

Optic604in the notification device may be used for a variety of purposes. One purpose may be to channel light from one, or multiple, light generating devices.FIG. 7Aillustrates one example block diagram of an optic700and multiple light generating devices, such as strobe LED702and communications LED706. Strobe LED702and communications LED706are different in at least one aspect. For example, strobe LED702may be configured to generate a higher light output than communications LED706and/or may be configured to generate light in a different frequency spectrum than communications LED706. More specifically, strobe LED702may be configured to generate light output in order to comply with UL Specification 1971. In contrast, communications LED706may be used for display only, such as providing a visual indicator indicative of a status of the strobe device. For example, the notification device may be configured to test itself. In response to a determination that a part of the notification device is faulty, the notification device may activate the communications LED706in order to provide a visual indication of the fault. As another example, communications LED706may blink when the notification device is being polled. An operator visually inspecting various notification devices may readily notice the light generated by the communications LED706, and in turn recognize that the particular notification device is faulty. In order to assist the operator in noticing the light, the frequency spectrum of the communications LED706may be different from the strobe LED702. For example, the communications LED706may output light in the red color frequency range.

Both strobe LED702and communications LED706may be positioned relative to the optic700such that light output from either strobe LED702or communications LED706may pass through the optic700. In one embodiment, the light output from strobe LED702may be directed at a different portion of the optic than light output from communications LED706. For example, the light output from strobe LED702may be directed to a center portion of the optic700, and the light output from communications LED706may be directed to an off-center portion of the optic700, such as the gate640of the optic.

FIG. 7Billustrates another example block diagram of optic700, strobe LED702and communications LED706, and light pipe704. In this regard,FIG. 7Bdiffers fromFIG. 7Awith the addition of light pipe704. Light generated by communications LED706may be channeled to optic700using light pipe704.

Another purpose of the optic may be to channel light to one or more sensors resident in the notification device. Sensor(s) may be used in order to determine various light levels, such as an indication of the amount of light emitted from the strobe LED and/or an indication of the amount of ambient light. In this regard, the optic may be used to transmit light generate by strobe LED and may also be used to channel light to the sensor.FIG. 8Aillustrates one example block diagram of an optic800, strobe LED702and sensor804. As shown, the light from strobe LED702may be transmitted to optic800. Light transmitted from strobe LED702is transmitted to optic800, part of which is reflected back to sensor804and another part of which is transmitted through the optic800.

FIG. 8Billustrates another example block diagram of optic800, strobe LED702, sensor804, and light pipe802. In this regard,FIG. 8Bdiffers fromFIG. 8Awith the addition of light pipe804. Light reflected from optic800may be channeled to sensor804using light pipe702.

FIG. 8Cis a cross-sectional view illustrating the optic700or800, the light pipe704or802, the communications LED706and sensor804. In one embodiment, the light pipe704or802may be used for a single purpose. For example, the light pipe704or802may be used to channel light generated from the communications LED706to optic700. As another example, the light pipe704or802may be used to channel light reflected from optic800to sensor804. Alternatively, the light pipe704or802may be used for multiple purposes. For example, the light pipe704or802may be used for both channeling light generated from the communications LED706to optic700or800and for channeling light reflected from optic700or800to sensor804.

FIG. 9Aillustrates an underside of the front housing610of the notification device. As discussed above with regard toFIG. 6A, the notification appliance may include front housing610. The underside of front housing610may include a post904. The post904may provide structural support for front housing610. Post904is configured to contact (or nearly contact) a part of main PCB614. For example, post904is configured to contact at point613on main PCB614, thereby touching at least a part of main PCB614. As another example, when front housing610, main PCB614, and back cover616are connected, post904is configured to be proximate to point613. In this regard, if excessive pressure is applied to main PCB614(such as by excessive force applied to wire connecting mechanism618opposite to point613), post904may provide additional structural support to main PCB614. Point613is inside four pins615on main PCB614(such as geometrically in the center of the four pins615). Four pins615are used to connect wire connecting mechanism618(e.g., the terminal block) to main PCB614. In use, pressure will be applied to wire connecting mechanism618. Thus, since post904abuts one side of main PCB614, the opposite side of which resides the wire connecting mechanism resides. In this regard, post904may provide additional structural support when pressure is applied to main PCB614. Likewise, post904may provide support from pressure applied via the front face of the notification appliance. As discussed above, the front face of the notification appliance may include one or more elements through which to input information. For example, the elements may comprise switches or the like, such as illustrated inFIG. 13A. In this regard, the operator may apply force to the front face of the notification appliance when manually setting the switches. The post904may provide the additional structural support to withstand the operator's pressure applied to the front face.

The underside of the front housing610may further include a slot902which may receive a light pipe, such as light pipe704,802. Also, the underside of the front housing610may further include slot901for light pipe (FIG. 11Billustrates light pipe1100being inserted into slot901). Slot902comprises a screw receptacle in which a screw, such as screw602inFIG. 6A, is inserted through hole642of optic and is mounted into slot902.

FIG. 9Afurther illustrates holes903,905. When front housing is connected to main PCB914and/or back cover616, at least a part of the electronics on main PCB914may be accessible via holes903,905. In one embodiment, the electronics may comprise manually configurable input devices (such as switches or the like).FIG. 13Aillustrates examples of manual configurable input devices1302,1304.

FIG. 9Billustrates a first view of wire connecting mechanism618on the back cover616of the notification device, illustrated inFIG. 6A.FIG. 9Cillustrates a second opposing view of wire connecting mechanism618on the back cover616of the notification device. In one embodiment, wire connecting mechanism618may be part of main PCB614. In this regard, when main PCB614is connected to back cover616, wire connecting mechanism618is pushed through hole654of back cover616. Main PCB614may include one or wire connecting mechanism618in which wires may be connected. One example of wire connecting mechanism comprises a terminal block. The wire may be held within the terminal block by the tightening of a screw. The wire may be wrapped directly under the head of a screw or may be held by a metal plate forced against the wire by a screw.

FIGS. 9B-Cillustrate wire connecting mechanism618in which two separate wires may be connection. Alternatively, wire connecting mechanism618may be configured with a single slot for insertion of only a single wire, or may be configured with a plurality of slots for insertion of multiple wires, such as 2 slots for insertion of two wires (seeFIGS. 9B and 9C), 3 slots for insertion of three wires, etc. Wire connecting mechanism618includes screws906,908, which may be turned (such as turned counter-clockwise) in order to enable the sliding of a wire into hole (illustrated inFIG. 9D). Upon insertion of the wire into the hole, the screw906,908may be turned (such as turned clockwise) in order to press the screw against the inserted wire. In this regard, electrical contact with the inserted wire may be made.

Insertion of wires into the hole(s) of wire connecting mechanism618may be difficult. In one embodiment, back cover616may include a ramp and/or a valley may be used in order to assist in the insertion of the wires into hole(s) of wire connecting mechanism618. More specifically,FIGS. 9B-Dillustrate a section of back cover616that includes ramps902,904, valleys912,914, and wall910. Ramps902,904may provide a gradual decline from an upper surface916to the valley912,914. In order to ease the insertion, ramps902,904may be used. Further, wall910may separate valleys912,914in order to assist in the insertion of a wire into the respective slot.

FIG. 9Cillustrates screws906,908unscrewed so that wire connecting mechanism618includes holes922,924through which wires may be inserted. After insertion of the wires, screws906,908may be screwed down in order to hold wires in place and maintain electrical contact. As shown inFIG. 9C, bottom926,928of terminal block is level with valleys912,914. Thus, there is no bump or obstruction when inserting wires into wire connecting mechanism618. Alternatively, bottom926,928may be lower than valleys912,914.

FIG. 10Aillustrates a part of an underside of the escutcheon1000, which is configured to connect with the front housing610illustrated inFIG. 6A. The underside of escutcheon1000includes a speaker grille1002and a raised lip1004. The speaker grille1002is configured to protect the speaker, which is mounted on main PCB614, from dust or dirt, and may be in a variety of patterns. The raised lip1004may be around part, or all, of the perimeter of the speaker grille1002. As shown inFIG. 10A, the speaker grille1002is circular in shape. In this regard, the raised lip1004may likewise be circular in shape. Similarly, the speaker grille1002may be rectangular in shape, with the raised lip following the rectangular shape.

FIG. 10Billustrates a part of the main PCB614illustrated inFIG. 6A. As illustrated inFIG. 10B, the speaker1010is fitted with a gasket1012. Gasket1012may be composed of rubber or other flexible material. As shown, gasket1012covers an entire perimeter of the upper side of speaker1010. Alternatively, gasket1012may cover less than all of the perimeter of the upper side of speaker1010.

When the escutcheon1000attached to front housing610, the raised lip1004may contact the gasket1012. In this regard, contact between the raised lip1002and the gasket1012may form a seal, thereby reducing the likelihood of dirt or debris entering an interior of the notification device.

FIG. 10Cillustrates another view of an underside of the escutcheon1020with gasket1022. As discussed above, the escutcheon1020is configured for mounting to front housing610. The underside of the escutcheon1020includes gasket1022. In this regard, the gasket1022may act as a shaped piece or ring sealing the junction between the escutcheon1020and the optic604. Gasket1022may be composed of rubberized or other type of sealing material.FIG. 10Eillustrates another view of an underside of the escutcheon1020without gasket1022. As illustrated inFIG. 10E, the underside of the escutcheon1020includes an inset1050or cutout in which the gasket1022may be seated. In one embodiment, when the gasket1022is seated in inset1050, the gasket is flush with the surrounding area on the underside of the escutcheon1020. In an alternate embodiment, when the gasket1022is seated in inset1050, the gasket is not flush with the surrounding area on the underside of the escutcheon1020.

As illustrated inFIGS. 10C and 10E, the inset1050includes one or more corners (three of which are illustrated inFIG. 10Cas1032,1034, and1036and four of which are illustrated inFIG. 10Eas1032,1034,1036,1038). The corners may be formed such that a part on the optic other than flange630may engage the underside of the escutcheon1020. More specifically, gasket1022may form a seal with flange630. In addition, corners1032,1034,1036,1038may engage with edges1040,1042,1044of optic604. In this way, the optic604may be held more securely in position by using two different points of contact to optic604.

In one embodiment, gasket may have a width that matches the width of flange630of optic604. Upon mounting, the gasket contacts a part of the optic604, such as the flange630of optic604.FIG. 10Dillustrates the contact of gasket1022with flange630of optic604. The sealing may thus prevent water or the like from entering via the escutcheon opening.

FIG. 10Cfurther illustrates the manner in which the escutcheon1020may be attached to the front housing610. Escutcheon1020includes one or more ways in which to be attached to the front housing610. For example, clasps1024,1030may be used to snap into a part of front housing610, such as into tabs649,651. Further, holes1026,1028may likewise be slotted into or mate with protrusions on front housing610, such as into tabs645,647,1326. In this regard, the escutcheon1020may be connected to the front housing610in one or multiple ways.

FIG. 11Aillustrates a perspective view of the light pipe1100. Light pipe1100may be the light pipe704illustrated inFIG. 7Bor may be the light pipe802illustrated inFIG. 8B. As discussed above, the light pipe may serve one function or multiple functions. For example, the light pipe1100may be used to channel light generated from the communications LED to an optic and/or may be used to channel light reflected from the optic to a sensor. The light pipe1100includes a shaft1102through which light is channeled. One end1108of the shaft1102may angled. The angle of the one end1108may be similar, or match the angle of the LED PCB. For example,FIG. 8Cillustrates the plane formed by end1108is perpendicular to the plane formed by LED PCB.

Further, the light pipe1100includes a collar1104, which may be positioned toward a top of the light pipe1100. The collar1104may be shaped to mate with a part of the front housing610of the notification device. For example, the collar1104may include one or more sides1106, which may mate a hole1110on front housing610.FIG. 11Billustrates light pipe1100seated in hole1110of front housing610illustrated inFIG. 6A. As shown, hole1110includes a flat face1112. For installation, the light pipe1100may be rotated until the flat face1106on collar of light pipe1100matches the flat face1112of hole1110. When slotted properly, the end1108is parallel to the LED PCB. The shape of the collar1104and of hole1110are merely for illustration purposes. Other shapes are contemplated such that light pipe1100seats properly in hole1110.

An electrical junction box is a container for electrical connections. The electrical junction box may be used to conceal the electrical connections from sight and to deter tampering. The electrical junction box may be installed in walls or in ceilings, such that the electrical junction box is recessed into the wall or the ceiling or flush with the wall or the ceiling. Electrical junction boxes may vary in size depending on the geographic location. For example, the size electrical junction boxes in the United States may differ from the size of electrical junction boxes in Europe or the Middle East. An example of a single gang electrical junction box for the United States is illustrated inFIGS. 13B-E, discussed below. As shown, the notification appliance is connected at the top and the bottom of the junction box (i.e., at 12:00 and 6:00). However, different types of junction boxes may be configured differently.

Instead of configuring different notification appliances to connect to different junction boxes, a notification appliance may be designed to connect to a single type of junction box (such as the single gang electrical junction box for the United States), and an adapter bracket1200may be used so that the notification appliance may be connected to other types of junction boxes. In this regard, rather than connecting the notification device directly to the junction box, an intermediate piece, such as adapter bracket1200, may be used to connect the notification appliance to the junction box1210.

Adapter bracket1200includes one or more holes that enable connection of the adapter bracket1200to junction box1220.FIGS. 12A-Billustrate one type of junction box1220, which is rectangular in shape and includes holes1224,1230. Other types of junction boxes may have different shapes, such as circular, and may have different placement of holes (such as at 2:00 and 8:00).

Adapter bracket1200may include one set of holes to mate with the holes in the junction box. Alternatively, adapter bracket1200may have multiple sets of holes in which to mate with the holes in different types of junction boxes. For example, as shown inFIGS. 12A-B, adapter bracket1200includes holes1202,1204, which match (or nearly match) the size of holes1224,1230on the connection elements1222,1228. Holes1202,1204may comprise keyholes for ease of installation. When the adapter bracket1200abuts the junction box1220, such as illustrated inFIG. 12B, screws may be screwed through holes1202,1204and1222,1228, respectively. Adapter bracket may further include holes1232,1234, which may match (or nearly match) holes for a type of junction box not illustrated inFIGS. 12A-B(in which the holes in the junction box are at 2:00 and 8:00). As shown inFIGS. 12A-B, holes1232,1234are not keyholes. In an alternative embodiment, holes1232,1234may be keyholes.

Adapter bracket1200may further include one or more sidebars1236,1238. As shown inFIGS. 12A-B, two sidebars1236,1238are shown, which are proximate to holes1202,1204. In this regard, sidebars1236,1238may provide additional strength or rigidity to the portion of adapter bracket1200near or proximate to holes1202,1204. Alternatively, only one sidebar may be included. In still an alternate embodiment, sidebars may be included on each side of adapter bracket1200.

Junction box1220includes an opening1226. As shown inFIGS. 12A-B, the opening1226of the junction box1220is rectangular. Alternatively, the opening of the junction box may be square in shape. Likewise, the adapter bracket1200includes an opening1208. As shown inFIGS. 12A-B, the opening1208of the adapter bracket1200is rectangular. Alternatively, the opening of the adapter bracket may be square in shape. The opening1208of the adapter bracket1200may be sized differently than the opening1226of the junction box1220. In one embodiment, the opening1208of the adapter bracket1200has a dimension that is different from a dimension of the opening1226of the junction box1220. In a more specific embodiment, at least one dimension of the opening1208of the adapter bracket1200is larger than the dimension of the opening1226of the junction box1220. For example, the opening1208may be larger in the x-direction, may be larger in the y-direction, or may be larger in both the x-direction and the y-direction. As illustrated inFIGS. 12A-B, the opening1208is larger in the y-direction only. Further, a total area of the opening1208may be larger than a total area of the opening1226. Alternatively, the opening1208of the adapter bracket1200may be smaller than the opening1226of the junction box1220. As discussed in more detail below, the different dimensions of openings1208,1226enables the adapter bracket1200to install notification appliances with different types of junction boxes.

In one embodiment, adapter bracket includes two different types of connection elements by which to connect the notification appliance to the adapter bracket. For example, adapter bracket1200includes standoff1206, which may be a threaded standoff through which a screw may be inserted, and tab1210, using which the notification appliance may be hooked to the adapter bracket1200. Standoff1206may be a through-hole or a raised screwhole. In one embodiment, standoff1206is mounted on a solid part of bracket. Alternatively, standoff1206is mounted on a hole so that a screw may be screwed through standoff1206and into junction box1220.

With regard to standoff1206, a part of the notification appliance, such as back cover616, may likewise include a hole. A screw may be inserted through the hole on the back cover616, and through standoff1206in order to attach the notification appliance to the adapter bracket1200(and in turn to junction box1220). Alternatively, instead of attaching a part of the notification appliance to standoff1206of adapter bracket1200, the hole (or holes) on the back cover616may be positioned such that the hole (or holes) line up with holes1202,1204and1222,1228. In this regard, the screws may pass through each of the holes on the back cover616, through holes1202,1204on adapter bracket1200, and through holes1222,1228on junction box1220.

Adapter bracket1200further includes tab1210. Tab1210may have at least one curved portion. As shown inFIGS. 12A-B, tab1210includes two curved portions1212,1214. In this regard, the tab may engage a hole on a back part of the notification appliance, such as a hole (or other opening) on the back cover616of the notification appliance. In a specific embodiment, the hole on the back cover616of the notification appliance may comprise a keyhole opening. When the tab, with its one or more curved portions, is engaged in the hole of the notification appliance, the tab acts to hook the hole, resulting in one or both of the following: the tab at least partly supports or holds up the notification device; and the tab reduces the possibility that the notification appliance can be pulled away from the wall or ceiling.

In practice, the notification appliance may be hooked to adapter bracket1200using tab1210. After which, one or more screws may be used to attach the notification appliance to the adapter bracket1200(such as inserting a screw through standoff1206). In this regard, in one embodiment, only a single screw is needed for attachment of the notification appliance to adapter bracket1200. Further, there may be instances where it is inadvisable to have the screw, which engaging standoff1206does not enter an interior of the junction box. In this regard, the single screw, when engaged in standoff1206, is not inserted into an interior of the junction box since the screwhole is raised. Alternatively, in the event that a hole (instead of a standoff1206is used), when a screw is screwed through the hole, the screw is inserted into an interior of the junction box. As discussed above, the junction box1220may be installed flush with the wall or ceiling. Thus, in instances where the notification appliance is larger than the opening of the junction box, the adapter bracket enables the insertion of the single screw, which is in the interior of the junction box. Further, tab1210does not require an additional screw, thereby avoiding inserting a screw into the wall or ceiling outside of the junction box1220.

The adapter bracket1200may sit flush between the junction box1220and the backside of the notification appliance. In this regard, the adapter bracket may be inconspicuous when the notification appliance is installed. Further, a gasket may be used to seal the backside of the notification appliance in order to weatherproof the notification appliance.

As illustrated inFIGS. 12A-B, a single junction box is shown. Alternatively, there may be multiple junction boxes, such as two junction boxes abutting one another, four junction boxes abutting one another in a square configuration, etc.

FIG. 13Aillustrates the notification device1300without the escutcheon, which may include front housing610, optic604, LED PCB608, input devices1302,1304, speaker1306, and keyhole openings1308,1310. The input devices1302,1304may be manually configurable. For example, the input devices1302,1304may comprise manual switches (e.g.,2position switches) in order for a technician to configure the notification device. As illustrated inFIG. 13A, the number of switches for input device1302is different than the number of switches for input device1304. Alternatively, the number of switches for input device1302may be the same as the number of switches for input device1304. In one embodiment, input device1302may be for input of the address of the notification device, and input device1304may be for input to configure the audio output, in the event that the notification appliance includes an audio output, such as a horn. In this regard, the controller of the notification device may poll both of input device1302,1304in order to determine the address and the audio configuration of the notification device, respectively. Thereafter, the address and the audio configuration of the notification device may be stored in a memory within notification device and/or may be transmitted external to the notification device (e.g., to a fire alarm control panel responsive to a command from the fire alarm control panel querying the notification device).

The speaker1306may be positioned in one of several places in the notification device. As one example, the speaker1306may be positioned off-center from the front housing. More specifically, the speaker1306is shown inFIG. 13Aas being off-center in the X-direction. As another example, the speaker1306may be positioned out of alignment with respect to the positioning of the LEDs622on LED PCB608. More specifically, the LEDs622on LED PCB608are shown as being centered in the X-direction, whereas the speaker1306is shown inFIG. 13Aas being off-center in the X-direction.

Front housing610may further include holes, such as keyholes1308,1310. In one embodiment, keyholes1308,1310may be in different orientations (such as keyhole1308being disposed horizontally and keyhole1310being disposed vertically. In an alternate embodiment, keyholes1308,1310may be a same orientation (such as keyholes1308,1310both being disposed horizontally or both being disposed vertically). Screws1312,1314may thus be inserted through keyholes1308,1310to connect to the junction box. In this regard, in addition to connecting front housing610to back cover616(discussed above), front housing610may likewise be connected to junction box via screws1312,1314. More specifically, front housing610may be squeezed or forced against junction box using screws1312,1314, which may provide structural support separate from attaching housing to back cover616. More specifically, screws1312,1314may press the front housing610against one or both of main PCB614or back cover616. Further, in one embodiment, connection of main PCB614to back cover616, such as via635,637,639, may be considered temporary or sufficient only until installation of the notification appliance to the junction box via screws1312,1314. Screws1312,1314, pressing the notification appliance together (including pressing front housing610against main PCB614onto back cover616), may thus hold various parts within the notification appliance (such as main PCB614) more permanently.

As discussed above, escutcheon (such as escutcheon1020) may be connected to front housing610via one or more tabs, such as tab1316shown inFIG. 13B.

FIGS. 13B-Eillustrating the side view, the back view, the front perspective view, and the back perspective view ofFIG. 13A. The notification appliance1300is connected to junction box1320. Junction box1320is a different type of junction box than junction box1220illustrated inFIGS. 12A-B.

In practice, the keyholes1308,1310enable the screws1312,1314to be inserted or screwed at least partly into the screw receptacles of junction box1320prior to the notification appliance1300being affixed to the junction box1320. More specifically, junction box1320may include wires for connection to a part of the notification appliance1300, such as to the terminal block of the notification appliance. After the wires from the junction box1320are connected to the notification appliance1300, the notification appliance1300is connected to the junction box1320. In one embodiment, the notification appliance1300includes back cover616, main PCB614, front housing610, LED PCB608, and optic604. In this regard, after inserting screws1312,1314into the junction box, the major portions of the notification appliance (including back cover616, main PCB614, front housing610, LED PCB608, and optic604) may be threaded through screws1312,1314via holes1308,1310. In this instance, the mounting of the notification appliance may be made easier since the screws are already at least partially installed into the junction box before pressing the notification appliance onto the junction box for mounting. Further, since the entire assembled unit (e.g., all of the parts of the notification appliance1300except for the escutcheon) may be threaded through the already mounted screws1312,1314, installation of the notification appliance is made easier. More specifically, because the screws1312,1314are already partly screwed into the screw receptacles of junction box1320, the notification appliance1300may be maneuvered using keyholes1308,1310so that the notification appliance1300is connected to the junction box1320. Thereafter, the screws1312,1314may be tightened so that notification appliance1300is securely fastened to the junction box1320. In one embodiment, the screws1312,1314are affixed only partly (and not wholly screwed into) receptacles of the junction box1320prior to the wires emanating from the junction box1320are attached to the terminal block of the notification appliance1300. In an alternate embodiment, the screws1312,1314are affixed only partly (and not wholly screwed into) receptacles of the junction box1320after the wires emanating from the junction box1320are attached to the terminal block of the notification appliance1300.

This process of partly screwing the screws1312,1314(and then threading the screws1312,1314through holes1308,1310of the notification appliance) is in contrast to positioning the notification appliance1300adjacent to the junction box1320(and lining holes1308,1310with screw receptacles of the junction box1320, and inserting screws1312,1314through holes1308,1310into the screw receptacles of the junction box1320). In the latter case, it may be difficult to line up holes1308,1310with screw receptacles of the junction box1320and thread screws through the lined-up holes1308,1310and screw receptacles of the junction box1320.

FIG. 13Fillustrates the connection of the front housing610to the back cover616. Front housing610includes two features1350,1352, such as protrusions, and back cover616includes two recesses1354,1356. In connecting the front housing610to back cover616, the two features1350,1352of front housing610are dropped down into recesses1354,1356of back cover616when the front housing610is at an angle to back cover616. Then, front cover610is swung toward back cover616until the bottom latch643of front housing610engages the cutout1358in back cover616.

FIG. 14Aillustrates a side view of the LED PCB608.FIG. 14Billustrates the notification device being connected to junction box1320(either directly or using adapter bracket1200). As discussed above, in one embodiment, multiple LEDs are used in the notification device (such as 2 LEDs, 4 LEDs, etc.). In order to drive the multiple LEDs, an extra energy storage device (such as an extra capacitor) may be used. For example,FIG. 14Ashows LED PCB608including multiple energy storage devices, illustrated as Capacitor #1(Cap #1) and Capacitor #2(Cap #2).

In one embodiment, Capacitor #1and Capacitor #2may have the same capacitance and be in parallel, thereby doubling the capacitance. Alternatively, the capacitors may have different capacitance and/or may be in a series configuration. In operation, the notification device will flash the LEDs for a predetermined period (such as 20 mSec) every 1 second or every 2 seconds. The capacitors provide the current to the LEDs for the LEDs to produce the flash.

In order to stay in the same footprint, at least a part of the electronics of the notification device, upon attachment to the junction box1320, is within the junction box or resides in an interior of the junction box1320. For example, the additional capacitor may be positioned on the LED PCB608such that upon installation of the notification appliance, at least a part of the energy storage device is within the junction box1320. In one embodiment, to stay in the same footprint, Capacitor #1is installed on one side of LED PCB608and Capacitor #2is installed on an opposite side of LED PCB608, such as illustrated inFIGS. 14A-B. In this regard, upon installation of the notification device, at least a part of the electronics of the notification device, such as the energy storage device, is at least partly within the junction box1320. Alternatively, both capacitors may be installed on an underside of the LED PCB608such that, upon installation of the notification appliance, both capacitors at least partly are within the junction box1320. In still an alternative embodiment, the capacitor may reside entirely within junction box1320upon installation of the notification device.

There are instances where it is desirable to test the light output of the notification device. For example, certain standards, such as UL, dictate the light output at certain angles from the LED PCB, such as 0°. However, it may be difficult to determine where the certain angles are. In order to assist in the determination, an optical alignment tool1500may be used.FIG. 15Aillustrates a front perspective view of optical alignment tool1500.FIG. 15Billustrates a bottom perspective view of optical alignment tool1500.FIG. 15Cillustrates optical alignment tool1500as installed in notification device600.

Optical alignment tool1500includes one or more legs that are configured to connect or snap onto a part of notification device600.FIG. 15Billustrates four legs1502,1504,1506,1508. Alternatively, fewer or greater number of legs may be used. As illustrated inFIG. 15B, optical alignment tool1500includes two pairs of opposing legs, with1502and1504being curved, and with1506and1508being straight.

Front face of optical alignment tool1500, illustrated inFIG. 15A, include one or more indicia to indicate different angles or points respective to the LED(s) in notification device600. For example, line “E” is indicative of the vertical centerline of the LED(s). Line “C” is indicative of the horizontal centerline of the LED(s). Line “D” is indicative of a line that is in the same horizontal plane as the LED(s) when installed at an angle. Point “A” is the intersection of line “D” and line “E”. Point “B” is the intersection of line “C” and line “E”. Thus, using the optic alignment tool1500enables easier determination as to various points of potential measurement with respect to the LED(s). The various lines and points illustrated on front face of optical alignment tool are merely for illustration purposes only. The specific lines and points of interest depend on the LED(s) on the LED PCB and also on the angle of installation of the LED PCB.

In one embodiment, it may be advantageous to change the color of the light output from the notification device. For example, the color of the light output may indicate different types of notification. More specifically, a white light output may indicate a fire emergency, whereas an amber light output may indicate an intruder on the premises (or a similar type of mass notification). Rather than have two separate notification devices that output a predetermined and non-changeable frequency range of light (e.g., a first notification device that outputs white light and a second notification device that outputs amber light), the notification device may be configured to dynamically change the frequency range of the light output.

The notification device may be configured to dynamically change the frequency range of the light output in one of several ways. In one embodiment, the change of frequency range may be achieved by mechanically changing optics (e.g., mechanically positioning an optic of amber color on top of the LED(s)). In a second embodiment, the change of the frequency range may be achieved by electrically changing optics (e.g., changing the color of the optic by sending a current through the optic).

FIG. 16Aillustrates a block diagram configured to dynamically change the frequency range of the light output by mechanically changing optics. Controller1600is configured to send a command to energy device1606in order for energy device to power either actuator for optics1602and/or LED(s)1604.FIG. 16Billustrates an expanded block diagram of actuator for optics1602. Energy device1606may comprise capacitor(s), or the like. As illustrated inFIG. 16A, energy device1606may power both actuator for optics1602and LED(s).

The controller1600may receive a command, such as from a fire alarm control panel, from a switch on the notification device, and/or from an operator controlled wireless handheld proximate to the notification device. The command may indicate a particular wavelength band. In response to receiving the command, the controller may command the actuator1602to effect the command.

The notification device may include a plurality of optics, such as a clear optic, an amber optic, and a blue optic. The plurality of optics may be positioned on a movable wheel, whereby a selected optic may be pressed into contact with LED PCB608. As illustrated, for example, inFIGS. 6E-F, the LEDs may be proximate to the optic. In this regard, when mechanically moving the optic, one may first disengage the optic, such as by moving the optic in a direction perpendicular to the plane formed by the LED PCB608. In this regard, when it is desired for another optic to be pressed into contact with LED PCB608, functionality for disengaging the optic1610may be used to disengage the current optic from contact with LED PCB608. Thereafter, functionality for moving new optic into pace1612, which may comprise a cam or a solenoid, may move the movable wheel (either clockwise or counter-clockwise) until the desired optic is positioned over LED PCB608. Finally, functionality for engaging the new optic1614may then press the desired optic into contact with LED PCB608to engage the desired optic with LED PCB608.

As discussed above the notification device may include an escutcheon, which may sit on top of front housing610, may likewise move. Thus, when moving the optic, at least a part of the escutcheon may move as well. For example, the escutcheon may include a flap, which may be moved upward (e.g., in the direction perpendicular to and away from the plane formed by the LED PCB608). The new optic may be moved into position, and then engaged. Similar, upon engaging the new optic, the flap of the escutcheon may likewise move back into place (e.g., in the direction perpendicular to and toward the plane formed by the LED PCB608).

As discussed above, another manner in which to change the color of the light output is by modifying the color of the optic electrically.FIG. 16Cillustrates using an electrically alterable lens in order to configure the strobe to operate at one of the first wavelength band or the second wavelength band.FIG. 16Dillustrates the notification device using the electrically alterable optic depicted inFIG. 16Cin order to configure the notification device to operate at one of the first wavelength band or the second wavelength band.

Optic1650may include an electrically alterable layer1652. For example, the optic1650may comprise a liquid layer (such as1652) sandwiched between two layers of glass or other suitable material. Alternatively, a film (instead of a liquid layer) may be used, comprising a treated material applied to the film or a chemical layer between two films. The color of the optic1650may be controlled via a control wire1654attached to the layer. For example, the electrically alterable layer1652may be heated using control wire1654, causing a molecular change in the liquid, and thereby allowing different light wave lengths to pass and to be blocked. Alternatively the color of the optic could be altered by a current flowing through the film layer via control wire1654, causing a molecular change in the film allowing different light wavelengths to pass and to be blocked. Thus, the control wire1654may cause tinting or shading of the optic1650.

As discussed above, the command may indicate a particular wavelength band. The controller1660may send a signal to an optic configuration circuit1666indicating the wavelength band or color for the optic1650. Based on the signal from the controller1660, the optic configuration circuit1666may generate a control signal and send it on the control wire1654. The control wire1654may then be used to change the color of the optic1650from clear to amber or amber to clear. Though amber and clear colors are described, other colors may be used as well. Further, as shown inFIG. 16D, the notification appliance may only consist of one or multiple LEDs1664and a single LED drive circuit1662to drive the one or multiple LEDs1664. Thus, the electronics necessary for the notification device are less than a traditional strobe that requires multiple LEDs and multiple LED drive circuits to output light at different wavelengths.

The command to configure the strobe lens may be received at the notification device along with the command to activate the notification device. In that instance, the controller1660may first configure the optic1650, and then immediately thereafter activate the notification device (such as by sending a command to the LED drive circuit1662, which in turn, activates the one or multiple LEDs. Or, the command to configure the optic may be received at the notification device before the command to activate the notification device. In that instance, the command to configure the optic1650may be implemented immediately upon receipt at the notification device. Or, the command may be stored and implemented thereafter (such as when a subsequent command to activate the notification device is received). For example, a control signal may be sent (such as in a broadcast to multiple notification devices that are non-addressable) in which the control signal is a predetermined pattern indicative of the wavelength band for output on the multiple notification devices.

In notification device that are addressable, this process of changing the color of the optic1650may be initiated via communications from the fire alarm control panel14. In a non-addressable strobe device, this process of changing the color of the optic1650may be initiated via an additional wire from the control panel.

As discussed above, the notification device may be installed in a variety of environments and in a variety of ways. For example, the notification device may be installed on a wall, such as illustrated inFIG. 14B. As another example, the notification device may be installed on a ceiling.FIG. 17Aillustrates an exploded view of one example of a notification device1700configured for ceiling mount. The notification device1700includes a cover1702, optic1704, LED PCB1706, housing1708, speaker1710, driver board1712, insulator1718, and transformer board1722. Cover1702may be attached to the notification appliance via connection with housing1708. For example, housing1708may include protrusion(s)1724that mate with an underside of cover1702. In one embodiment, there are a plurality of protrusions1724, such as at 12:00, 3:00, 6:00 and 9:00. One type of mating comprises a snap-fit, whereby protrusion(s) comprise a small lip for hole(s) in cover1702to engage. Using a snap-fit allows for attachment without the use of screws, making attachment easier (no tools are required) and less obtrusive.

FIG. 17Aillustrates that the substrate1714of the driver board1712is crescent moon shaped. In this regard, the driver board1712is configured such that, when the speaker1710and driver board1712are installed in the notification device1700(illustrated inFIG. 17B), the speaker1710breaks the plane defined by the substrate1714of the driver board1712. Further, because the speaker1710is installed off-center from the housing (seeFIG. 18A), the driver board1712may be installed. In one embodiment, the speaker1710is installed to one side of the housing, and the driver board1712may be installed to another side of the housing (e.g., the center of the speaker1710may be off-center of the housing on one side and the center of the driver board may be off-center on an opposite side). In an alternate embodiment, the speaker1710is installed to one side of the housing, and the driver board1712may be installed such that the driver board1712is centered in the housing. Thus, at least a part of the driver board1712is around at least a part of the speaker (e.g., the substrate1714at least partly encircles a part of the speaker). This allows for a more compact assembly of the notification device1700, and thereby a smaller depth notification device. Further, the speaker1710may be offset (such as discussed below with respect toFIGS. 21A-B), thereby allowing the driver board to be positioned in a larger area around the speaker1710.

The electronics may be arranged on the substrate1714of the driver board1712such that the speaker1710can break the plane defined by the driver board1712. For example, capacitor(s)1716may be arranged on an underside (relative to the speaker1710) of the substrate1714. When installed, parts of the driver board1712(such as the capacitor(s)1716) and at least a part of the speaker1710may sit within a cavity1720of insulator1718. Insulator1718may be configured to insulate various parts of the notification device, such as the capacitor(s)1716and the magnet within speaker1710from the electrical junction box. For example,FIG. 17Ashows capacitor(s)1716are stood up on the underside of the substrate1714. The insulator1718may be molded such that the capacitors may sit within insulator1718. In this regard, the insulator creates an electrical barrier between electrical components installed on the driver board1712from wiring in the junction box. More specifically, insulator1718may keep transformer board1722and part or all of driver board1712(such as capacitors1716) conductively separate. In one embodiment, when installed within the electrical junction box, at least a part of the capacitor(s)1716may be contained within the electrical junction box, such as illustrated inFIG. 14B.

FIG. 17Cillustrates an exploded view of another example of a notification device1750configured for ceiling mount. The notification device1750includes a cover1752, optic1754, LED PCB1756, housing1758, speaker1760, driver board1762, insulator1768, transformer board1772, and junction box1774.

The substrate1764of the driver board1762is rectangular shaped with a small cutout. In this regard, the driver board1762is configured such that, when the speaker1760and driver board1762are installed in the notification device1750, the speaker1760breaks the plane defined by the substrate1764of the driver board1762.

FIG. 17Cillustrates an arrangement of the electronics on the substrate1764of the driver board1762slightly different from the arrangement illustrated inFIG. 17A. The capacitor(s)1766may be arranged on a topside (relative to the speaker1760) of the substrate1764. When installed, a part of the speaker1710(but not a part of the driver board1762) may sit within a cavity1770of insulator1768.

Transformer board1772may include on a backside (the side that faces the junction box) one or more switches to configure the notification appliance. The switches may be used to configure part or all of the notification appliance. For example, in a notification appliance that includes a speaker, such as illustrated inFIG. 17C, the speaker settings may be programmed using the switch(es) on the backside of transformer board1772.

FIG. 18Aillustrates a front view of the notification device with the cover1702removed. As discussed above, the notification device may include one or more input devices.FIG. 18Aillustrates multiple input devices1802(dip switch input configured to set an address),1804(candela switch configured to input the candela setting). The housing device of the notification device allows for easy access to the various input devices1802,1804.FIG. 18Billustrates a part of the notification device with the front cover1702. A hole in the front cover1702,1752enables viewing of the candela setting on input device1804.

The housing1708may be modeled such that a part of the housing includes one or more light pipes.FIG. 19Aillustrates front view of the housing1708of the notification device1700.FIG. 19Billustrates an expanded view of a portion ofFIG. 19A, including light pipe1904, which may be a part of the housing. In one embodiment, the housing1708may be a single molded piece that include the light pipe1904. For example, the housing1708may be partly or completely composed of clear plastic to act as a light pipe1904in designated areas. In this regard, the light pipe1904may provide at least some structural support to the housing1708. The light pipe1904may be configured to transmit light from LED PCB1706and optic1704to a light sensor (not shown) on the driver board1712.

FIG. 20Aillustrates a back view of the housing1708of the notification device1700.FIG. 20Billustrates an expanded view of a portion ofFIG. 20A, including light pipe2002, which, similar to light pipe1904, may be a part of the housing. The light pipe2002may transmit light from a communications LED (e.g., an LED indicator) on the driver board1712, through the cover1702, to a person inspecting the notification device1700.

FIG. 21Aillustrates a front view of the housing1708and the speaker1710of the notification device1700. The housing may include one or more support elements.FIGS. 20B and 21Aillustrate a plurality of support elements, such as2004,2006,2008,2010,2012. The speaker1710is mounted behind the housing1708. In this regard, the output from the speaker1710is at least partly blocked by the various parts within the notification device1700, such as parts of the housing (e.g.,2004,2006,2008,2010,2012), the optic1704, and the LED PCB1706. In order to reduce blocking the output from the speaker1710, the speaker1710is positioned within the notification device1700to be off-center. As shown inFIG. 21A, speaker1710includes a center portion2102. The center portion2102typically is the position where the voice coil of the speaker resides. In this regard, the center portion2102is typically the part that generates the most audio output. Offsetting the positioning of the speaker1710reduces blockage of the center portion2102from different parts of the notification device1700, thereby increasing the effective output of the speaker1710.

FIG. 21Billustrates a back view of the electrical junction box2104and the notification appliance1700, including the housing1708and the speaker1710of the notification device1700. The positioning of the speaker1710within the notification appliance enables improvement of use of the interior space within the electrical junction box2104. As discussed above, various parts of the notification appliance1700may be contained within the electrical junction box2104, such as part of the driver board1712(e.g., at least a part of capacitor(s)1716) and/or at least a part of speaker1710(e.g., the back part of the speaker1710that includes the magnet). Using the configuration as illustrated inFIGS. 17A-Band21A-B enables a more efficient placement of different parts of the notification device into the volume within the electrical junction box2104.

FIG. 22illustrates the notification device1700with the cover1702attached and installed within the electrical junction box2104. The cover1702includes holes2202which may be dispersed symmetrically around the cover2104. As shown, the speaker1710is positioned off center. In this regard, the position of the speaker1710is asymmetrical with respect to the cover2104and with respect to the holes2202in the cover2104.

The ceiling mounted notification appliance may likewise be weatherproofed in one of several ways. In one way, the optic Similar to the wall-mounted notification appliance (SeeFIGS. 10C-D), the ceiling mounted notification appliance may include a seal (such as gasket1022) between the optic and the escutcheon.