Abstract: A motor-driven automobile antenna equipped with a timer which stops a motor for extending and retracting a rod antenna via a rack rope after a lapse of time which is longer than the period of time required by the antenna to be fully extended or retracted.

Abstract: A rod antenna including a plurality of rods of respectively different diameters which are coupled with each other in a manner to be slidable. Each of the larger diameter rods is provided with a rectangular strip of film made of resin such that it is mounted in a ring shape at least at the inside joint area for coupling the larger diameter rod with the smaller diameter rod. The rod antenna can be low in cost since the cutting process done for the conventional antennas is eliminated, and the rectangular film strip is inexpensive and can be easily mounted. Besides, a satisfactory waterproofing can be obtained as the rectangular strip of film is excellent in heat resistance, cold resistance, water repellency, wear resistance, etc. Furthermore, the operating noise of rods during the extension or retraction of the antenna is low and the appearance of the rod can be kept clean.

Abstract: A rod antenna control system for automobiles wherein electric current is supplied continuously to a motor which pushes up an antenna motor when a current below a predetermined value is flowing to the motor, and the current is supplied intermittently to the motor when a current above a predetermined value flows to the motor, and whether or not the electric current is over or below the predetermined value is determined by integrating the motor current for certain period of time and comparing such integrated value to the predetermined value.

Abstract: An automobile antenna fastening device comprising an inner fastening assembly and outer fastening assembly. The inner fastening assembly includes a gland washer made of an elastic material and a gland base, and the outer fastening assembly includes a pad and fastening nut. An antenna is mounted on the automobile body wall by clamping the automobile body wall between the outer and inner fastening assemblies, and the clamping force of the fastening assemblies is maintained by the elastic deformation of the gland washer of the inner fastening assembly.

Abstract: An automobile antenna control device generating a reset pulse which starts the operation of a microcomputer. The pulse is generated when an automobile radio power source is switched from "off" to "on," or when the power source is switched from "on" to "off," so that a so-called runaway of the microcomputer can be prevented. The power source is connected to an input port of the microcomputer; the antenna is extended when the power source is "on," and is retracted when the power source is "off." The extending or retracting action of the antenna is stopped when the starter power source of the master key switch of the automobile is "on.

Abstract: Inductance coupling type transmission channel couplers mounted on either side of an insulator such as window glass of a vehicle including a pair of resonator, each including a cylindrical outer conductor and a helical conductor coaxially provided in the outer conductor with one end connected thereto. The resonant frequency of the tuning inductance circuit thus constructed is set at 1/3 of an objective frequency, and the ratio between the inner diameter and the outer diameter of the helical conductor is set at 1.1-2.0.

Abstract: A non-grounded type ultrahigh frequency antenna including an antenna element having a length of .lambda./2 at a working frequency, a casing provided at the base of the antenna element, a metal section of the casing having a length of approximately .lambda./4 at the working frequency, and a metal plate provided in the casing and parallel to the metal section, one end of the metal plate being connected to the metal section and other end to the antenna element. The antanna is made parallel-resonant within a working frequency band by an electrostatic capacitance created between the metal plate and metal section and an inductance of the metal plate. The antenna element can be made slightly shorter than a length .lambda./2 at the working frequency and another metal plate can be provided between the antenna element and the metal plate so that a constant K-filter is formed by an electrostatic capacitance created by the another metal plate and the metal plate and a residual inductance of the antenna element.

Abstract: An automobile antenna including a high frequency signal processing unit provided near an antenna where the processing unit only tunes in a designated frequency band and amplifies it and further detects the amplified signal. The high frequency signal processing unit also adjusts the tuned frequency band at the high frequency signal processing unit based upon a tracking signal sent from an automobile receiver. Since the high frequency signal processing unit is provided adjacent to antennas, that is, near a glass antenna or mounted on an antenna mast, a loss which occur between the antenna and the receiver can be fully compensated for and noise interference can be avoided.

Abstract: An antenna for portable radiotelephones including an antenna element and antenna holder. The antenna element is covered by a non-conductive cover except for the tip and base ends which respectively have a cap and a sleeve, both made of conductive materials thereon. The antenna holder is made of conductive materials, fixed in a case of the telephone and is connected to a matching device. The antenna holder includes a fastening section and an engaging section and holds therein the antenna element so the antenna element can be pulled outside of and pushed back into the case. The fastening section engages with the cap of the antenna element when the antenna element is pulled outside of the case. Thus, the antenna element can be kept in a state of electrical continuity with the antenna holder, which is electrically connected to the matching device, at all times.

Abstract: A toroidal coil device used in a circuit of an automobile radio receiver as an element for blocking AM waves, including a ring core, U shaped first conductive members arranged on the core at circumferentially equal intervals, and second conductive members mounted on the first conductive members such that the inner end of each first conductive member is connected to the outer end of the next first conductive member.

Abstract: A drive control device for an electrically-driven extending and retracting antenna such as an antenna on an automobile including a motor-driven rotary plate which makes approximately one revolution during the time for complete extension or retraction and has attached, on one side, a disk-shaped conducting part with a small cut-out. Of the three contacts, the first is ordinarily in contact with the disk-shaped conducting part, maintaining a state of electrical continuity, the second contact contacts the small cut-out when extension of the antenna is completed; and the third contact contacts the small cut-out when retraction of the antenna is completed. As a result, electrical continuity is maintained during extension or retraction of the antenna, but not when extension or retraction has been completed. The first and second contacts thus constitute a limit switch for antenna extension; and the first and third contacts constitute a limit switch for antenna retraction.

Abstract: A clutch system for a motor driven telescopic antenna, a first rotor provided on a main shaft for moving an antenna drive cord of a telescopically adjustable antenna, a second rotor fitted over the main shaft and rotated by an electric motor, first and second clutch discs which are inserted over the main shaft and kept pressed in the shaft direction by a clamp in order to press hold both end surfaces of the second rotor in between by applying a pressurizing force to the second rotor. The clutch system further includes a clutch pressure setter for dissociating the first and second clutch discs from the second rotor when the force exceeding a specified clutch pressure that is set in relation to the engagement with the main shaft acts on the holding surfaces between the second rotor and the first and second clutch discs.

Abstract: An antenna system for a portable radiotelephone which does not require an expensive mechanical and bulky change-over switch to switch between the transmitting and receiving main antenna element and the call signal-receiving sub-antenna element. This is accomplished by a rod-shaped transmitting and receiving main antenna element within an antenna retaining mechanism so designed that the antenna element is free to slide in and out of the case of the radiotelephone. This case also houses a sub-antenna element which is in constant electrical contact with the antenna retaining mechanism. Conductive components in the elements provide the switching function, and one of them, a conductive tube, is constantly connected to the transmitter-receiver set in the case so that there is no deterioration of the characteristics of the main antenna element.

Abstract: An improved transmitting and receiving antenna for a portable radiotelephone with an antenna element which can be accommodated inside of the case of the portable radiotelephone, compensating for the drop in reception sensitivity that occurs when the antenna element is located inside of the case. The rod-shaped antenna element freely insertable into and removable from the case, and electrically connected to an antenna retaining mechanism both when the antenna element is retracted and extended. Thus, the antenna element functions even when it is located inside of the case. Moreover, an auxiliary antenna element is connected to the antenna element when the latter is located inside the case. The inductive reactance component of the auxiliary antenna element compensates for deterioration of the Standing Wave Ratio caused by the increased stray capacity resulting from the antenna element being located of inside the case.

Abstract: A small size broad-band ultra high frequency antenna including a dielectric substance in the sleeve of an antenna body whereby approximating resonance frequency of the sleeve portion to resonance frequency of the body of the antenna so that a double-tuning circuit is formed thereby causing the impedance characteristics of the antenna to have double-peak characteristics within the working frequency band. The antenna further includes an impedance matching transformer for matching the impedance of the antenna to the characteristic impedance of a feeder line connected to the antenna, the matching transformer being composed of a coaxial type impedance transducer which has an opposite reactance component sufficient to offset the reactance component of the antenna and has the characteristic impedance convertible to the feeder line impedance.

Abstract: A motor driven antenna for vehicles including an antenna element, an antenna housing tube which stores the antenna element and is fixed to a mounting hole of the vehicle body, a motor mechanism mounted on the base of the antenna housing tube, which retracts and extends the antenna element housed in the antenna housing tube, and a coupling mechanism for coupling the casing for the motor mechanism to the antenna housing tube. The coupling mechanism includes a first vibration absorber provided between a housing tube holding section of the motor mechanism casing and the base portion of the antenna housing tube, a second vibration absorber which fits on the antenna housing tube at a position away from the first vibration absorber a specified distance toward the tip of the end of the antenna housing tube and a coupling member for connecting the second vibration absorber and the motor mechanism casing so that the coupling member holds the second vibration absorber therein.

Abstract: A CATV system for a guest facility such as a hotel including a monitor installed in each room of the facility, an activator for activating the monitor with a signal sent from the front office of the facility, a sensor for detecting a guest who has entered the room and comes close to the monitor, and a display controller for displaying guest information such as a hotel guide on the monitor when the sensor detects the presence of the guest proximity of the monitor.

Abstract: A cooking appliance having a weight measuring device for measuring the weight of a container and the contents thereof, a storing device for memorizing the weight of the container and the content data, a weight variation detector for detecting the weight lost from the container and contents thereof at a specified ratio or by a specified weight from the weight of the container and contents thereof at the start of cooking, and a heating operation stopping device for stopping the heating of the container and contents thereof when the weight thereof is reduced to a specified ratio or by a specified weight from the weight of container and contents thereof at the start of cooking.

Abstract: A controlling device for an automobile motor driven antenna including a motor for extending and retracting an antenna by the power from a battery, and a control circuit for controlling the power. The control circuit includes a current detector for detecting the power flowing into and out of the motor and a current breaker which breaks the current when it is over a predesignated level so that a pair of relay contacts in the circuit changes the direction of the current so that the motor may make a forward or reverse rotation for extending or retracting the antenna and automatically make a stop of such rotation.