Abstract: The access window of a slot scanning data capturing system, or the gun of a hand held data capturing system, is fitted with a deactivation system of the type which is generally used to deactivate the tags or labels of an electronic article surveillance system so that the tag or label which is provided on the goods (to be purchased) is deactivated in the course of capturing the data at the point of sale.
Abstract: A lightning and strobe light detector and warning system capable of distinguishing strobe light and lightning flashes and indicating to an operator of the existence of a flash even under high illumination background conditions. The device may comprise a plurality of detectors and therefore not only distinguish between the strobe and lighting flashes but also indicate the direction of a flash.
Abstract: An optical security system is disclosed for one or more appliances such as a network of computers, terminals, and associated peripheral devices. The system comprises an optical fiber cable that is attached to an appliance through attachment devices that are secure from physical attack. The ends of the optical fiber are connected to a control box to form an optical fiber circuit which senses the amount of light within the fiber at any given time. The alarm device sounds if light within the fiber cable is attenuated through bending or breaking of the fiber cable in an attempted theft of the secured computer. The attachment devices comprise a two piece unit which holds the optical fiber. The first piece is a solid cone that is fastened to the computer component by a screw or adhesive. The second piece is a hollow cone that fits entirely over the solid inner cone. The cones include slots for holding the optical fiber between the cones.
Abstract: An automatic frequency control system, for an optical coherent communication system, in which an output frequency of a local oscillator is swept by a frequency sweep signal FM-modulated with a frequency shift signal. The FM-modulated local frequency is combined with an input optical signal and heterodyne-detected. A frequency shift signal component derived from a heterodyne detection output is compared with the frequency shift signal to verify whether or not the local oscillation frequency is in a predetermined range with respect to the input signal frequency. When it is in the predetermined range, the system operates to terminate the frequency sweep signal and remove the frequency shift signal and is switched to oscillation frequency control of the local oscillator by using a d.c. component of the hterodyne detection output.
Abstract: A wide band RF mixer includes a first bifilar balun transformer coupling a high level source of RF signal to the input winding of a trifilar balun transformer. The two output windings of the trifilar balun transformer are connected in series with the drain-source circuits of a pair of GaAs FET transistors. The source of each FET transistor is connected to ground. A local oscillator has a symmetric output signal that is coupled to a self-bias network and also to the gate electrodes of said FETs. An IF output signal is taken between ground and a common junction of the output balun windings. The arrangement provides a high level mixer with good intermodulation characteristics for ultra high frequencies.
Abstract: A security device for the prevention of theft is described. It comprises an alarm, a motion detector which provides a signal, effective through an electrical circuit for actuation of the alarm. The motion detector includes a tubular cylinder, a sphere and a tether which are conductive and connected in series across an electrical potential. Movement of the detector, from any initial orientation and in any direction results in an increase in contact resistance between the sphere and cylinder and generates a motion signal. After actuation of an arming switch, a motion signal energizes the alarm. Once armed, a disarming switch must be actuated to prevent or halt energization of the alarm. The device is detachably mounted on a brief case, with the switches on the exterior and connected by conductors to the remaining elements of the device mounted on the interior of the brief case.
March 8, 1988
Date of Patent:
June 25, 1991
Thomas A. Dailey, Alfred A. Dailey, Richard J. Dailey
Abstract: Nonlinear optical devices and techniques are used to provide heterodyne detection for coherent optical communications. Heterodyne detection is achieved by matching the wave front of a local oscillator beam with the wave front of a received optical signal. Precise wave front matching provides high heterodyne efficiency and a wide field of view. In one embodiment, the received signal and a reference beam of the same frequency are directed into a nonlinear medium to form a volume hologram that contains the spatial information of the received signal. The reference beam is alternated with a local oscillator beam that has the same wave front and is parallel to the reference beam but at a different frequency. The hologram matches the wave fronts of the signal beam and the local oscillator beam to produce a large heterodyne signal. In an alternative embodiment, the received signal beam and the local oscillator beam are directed into a mutually pumped phase conjugator (MPPC).
Abstract: An alarm lock particularly suitable for use with a bicycle or similar article to be secured, comprising a casing having an integral clamping device and containing an alarm siren which can be actuated either by an internal motion sensitive device, or by breaking or disconnecting a security loop which is connected around the article. Both of the alarm devices are connected to an automatically resettable detector circuit which includes a timer for resetting after a predetermined period. A battery for the circuit is contained in a compartment which is closed by abutment of the alarm lock against the body of the article, when it is attached by the integral clamping device.
Abstract: A self-contained and portable door answering and intruder alert apparatus having a magnetic tape recording device comprised of a highly sensitive microphone receiving circuit for capturing noise generated by a person located at the door of a structure and including a tape cassette operated in a timed sequential manner by an appropriate electronic circuit for transmitting to the person one of a plurality of messages prerecorded on the cassette prior to the unauthorized entry of the structure by the person, the timed sequence being synchronized and the apparatus being switched in order to permit each message to play in its entirety for preventing loss of continuity of each message.
Abstract: A personal locator transmitter adapted to be worn on the wrist and having the size and appearance of a conventional wrist-watch. This transmitter is provided with a programmable memory, a transmitter controlled by the memory, an antenna for reliably radiating signals from the transmitter regardless of orientation of the wrist of a user and including both a manually operable alarm activated by pressing a button, and an automatic alarm actuated by an attempt to remove the unit from the wrist of the wearer. The unit is controlled by a control memory comprised of an EEPROM encoded with unique identification codes and other information as required in the specific application.
October 16, 1989
Date of Patent:
May 7, 1991
Philip W. Weaver, Kamal Fakhry, Shin Saito
Abstract: An optical signal transmitter controls the intensity of a light which is transmitted over an optical fiber. The transmitter splits a light beam into two substantially equal parts which pass through two separate paths in a LiNbO.sub.3 substrate. The intensity of the light is separately switched back and forth between high and low intensitites in response to binary electrical signals. At the output ends of the two paths, the signals are recombined and sent over an optical fiber. The resultant recombined signal is a three level signal of (a) the light in both paths at a low level, (b) the light in one path at a high level and in the other path at a low level, and (c) the light in both paths at a high level.
Abstract: A patient ambulation motion detector is intended for attachment to a lateral generally vertical surface of a patient'body. The detector includes a motion sensor switch and a detachment detector switch which are mounted on a circuit board, the circuit board being in turn enclosed within an attachment casing which is attachable to a lateral surface of the patient's body. The motion sensor switch is a mercury switch mounted to the circuit board and having the axis of movement of the mercury contained therein oriented generally parallel to the circuit board so as to be responsive to declination of that portion of the patient's body to which the detector is attached and which declination is indicative of impending ambulation. The detachment detector switch is a spring contact switch which is openable and closable by a plunger acting thereon and sensitive to detachment of the detector from the patient's body. The detector may be wired to a conventional switched nurse call system.
Abstract: A deactivatable tag useable with an electronic article surveillance system and method of making such a tag. The tag includes a resonant circuit and a provision for promoting the permanent deactivation of the tag. The solution according to the present invention has been to render the deactivator more difficult to operate. A higher level of excess energy is applied to the resonant circuit before the breakdown material breaks down. This higher level of energy in the resonant circuit is applied to the improved deactivator and operates the deactivator much more completely. This arrangement promotes permanent deactivation of the resonant circuit to prevent the resonant circuit from becoming active again or "coming back to life" as time passes. The deactivator adjacent the resonant circuit can include a vacuum metalized conductive coating.
Abstract: The device has a source of acoustic signals placed beneath the hull of the boat, a beacon, an alarm pack worn by the navigator around the neck. If the navigator falls overboard, an acoustic sensor built into the pack detects the emission of the source and actuates the jettisoning of the beacon by remote control. This beacon has a measuring head fitted out with a directional acoustic sensor and a compass capable of computing information on the position of the beacon, transmitted by radio to a control box fixed in the boat. As the beacon is supposed to be near the castaway or man overboard, he is thus found.
Abstract: A system for protecting portable articles from unwanted use. The system includes a portable transmitter external to the article for transmitting coded signals of fixed radio frequency pulses to an electronic mechanism installed in the article. The mechanism includes a mode selector for operating the system in a first, second or third mode. There is also a device for activating an electronic flash, an alarm or other similar protective mechanisms during any of the modes, and a device for neutralizing the activating device.
Abstract: An earthquake detector is provided, which can sound an alarm several seconds before the arrival of the major shock of an earthquake, and which can be easily adjusted for sensitivity. For detecting local earth shaking of at least a predetermined dangerous acceleration level that constitutes a significant danger, a detector is provided that responds to shaking motion of an acceleration level between one-half and one-eighth the predetermined dangerous acceleration level to detect P-waves that arrive before the destructive S-waves, and which generates an audible alarm upon such detection. In one detector, two mercury-type switches are mounted with their directions of sensitivity both horizontal but perpendicular, the switches being mounted on a circuit board that can be tilted to alter their sensitivities.
Abstract: A method and an arrangement of automatic remote identification of separate objects or separate objects in a set of objects, each object being provided with identifier means comprising identifiers made by material with high magnetomechanical coupling, the identifiers preferably comprising a plurality of strips of said material, the resonant frequency thereof being tuned to correspond to the desired information specific to the object, said objects being disposed in an interrogation zone when identification is requested.
Abstract: A portable water-resistant device for signaling vehicles such as a taxi is formed of a lightweight, transparent plastic and is battery powered. The signaling device is provided with a first housing, a second housing movable relative to the first housing, the first housing containing a light source and a power source and reflective symbols affixed to the outer face of the first housing. The light source is selectively electrically connectable to a power source, such as a battery, which is activated when the second housing moves relative to the first housing and contact points extending from battery terminals and protruding through the first housing meet with contact points of the second housing. Additionally, in another embodiment the signaling device may be provided with an outer movable housing having a switch, an inner housing containing a light source and a power source electrically connected to the switch, and reflective symbols on the outer face of the inner housing.
Abstract: A system for protecting skis from theft which includes a digital transmitter, a timer, and a motion sensor all attached to the ski binding itself, and a hand held digital receiver. The system is fully enabled when the user removes the ski boot from the binding and manually turns on the receiver. Subsequent movement of the skis, for a length of time predetermined by the timer, allows the transmitter to send a unique digital code by standard radio frequency. The digital code is detected by only one receiver which in turn produces an audible alarm to alert the person carrying the receiver.