Abstract: A keyboard with N-key rollover has a matrix of key columns and lines for successively issuing key codes for depressed keys. When first and second keys on the same column are detected as being depressed and then a third key on the same line as one of the first and second keys is detected as being depressed, or when first and second keys on the same line are detected as being depressed and then a third key on the same column as one of the first and second keys is detected as being depressed, a key code for the third key or a key code for a fourth key detected in error upon depression of the third key are prevented from being issued.

Abstract: A communication apparatus for a remote control apparatus, for example, in order to lock or unlock doors or a trunk of a vehicle selects a radio signal or optical signal in accordance with the conditions between the transmitter and receiver. Its transmitter is provided with a radio signal sending circuit, an optical signal sending circuit and a selection circuit which selects any one circuit for operation and a receiver which is provided with a radio signal receiving circuit which receives a radio signal transmitted from said radio signal sending circuit and an optical signal receiving circuit which receives an optical signal transmitted from said optical signal sending circuit.

Abstract: Disclosed is here an apparatus for automatically adjusting a length of the antenna of the radio receiver in which the antenna is disposed to be integral with a high-frequency circuit section and a tuning circuit is configured to be in a variable capacity system. The apparatus includes a unit for detecting a condition that an intensity of an antenna input electric field is at least an optimal range so as to generate a first signal, a unit for detecting a condition that the intensity of the antenna input electric field is at most an optimal range so as to generate a second signal, a unit for detecting a condition that an interference signal is at least at a predetermined level so as to generate the second signal, a device for elongating the antenna based on the first signal, and a device for shortening the antenna based on the second signal.

Abstract: A coordinate system input device provides automatic calibration between coordinates detected and display coordinates and also provides a mouse function wherein movement of an object adjacent a display screen acts to move a displayed cursor an amount proportional to the movement of the object adjacent the display screen. In its automatic calibration function, the coordinate input device compares the coordinates of a displayed test cursor with the coordinates of a detected object adjacent the display screen and calculates a correction amount to correct subsequent detected coordinate positions. In its mouse function, the coordinate input device detects movement of an object adjacent the display screen and amplifies this movement to control a cursor displayed on the display screen. When the object is removed from the display screen, the procedure to be implemented, as indicated by the position of the cursor, is automatically initiated.

Abstract: A disk cassette loading mechanism for a disk driving apparatus, capable of preventing the accidental removal of a disk cassette from the disk driving apparatus.

Abstract: An electronic device for generating an activation signal in response to detection of an acoustic signal having parameters within respective predetermined ranges, and then automatically dialing a prestored telephone number and transmitting a prerecorded message over the telephone line in response to the activation signal. The device includes a transducer for transducing an acoustic signal into an electrical signal; a detector for outputting an activation signal in response to detection of an acoustic signal having parameters within respective predetermined ranges; and a telephone module for automatically dialing a prestored number and transmitting a prerecorded message in response to the activation signal. The detected parameters include the amplitude of the acoustic signal, the frequency of the acoustic signal, the duration of each burst of the acoustic signal, and the duration of each interval between successive bursts of the acoustic signal.

Abstract: A push button switch is disclosed having a case in which fixed contacts are arranged on an inner bottom surface of the case. A pair of terminals, formed integrally with the fixed contacts, project through the case and into a pair of recesses having vertical walls formed in a lower portion of the case. The terminals projecting into the recesses are both bent at substantially right angles to said fixed contacts so as to be arranged along the vertical walls of the recesses. The pair of terminals are thus formed to be in a same plane and enable the push button switch to be installed in a printed circuit board by an automatic inserter for radial lead type electronic parts.

Abstract: A dimmer control circuit having time constant regulating means provided in a multivibrator for regulating the load time ratio of the output pulse signal of the multivibrator to control ON, OFF the voltage of a battery applied to a lamp by the output pulse signal to thereby regulate the luminous intensity of the lamp comprising stopping means provided in the multivibrator for operating near the end of the regulation in a direction for increasing the luminous intensity of the lamp by the time constant regulating means and stopping the operation of the multivibrator. Thus, the dimmer control circuit can stop the operation of the multivibrator near the end of regulation in a direction for increasing the luminous intensity of a lamp to control the connection of a battery directly to the lamp with a fine current.

Abstract: A signal amplifier circuit which can amplify, with a simple construction, an AC component having an amplitude of one polarity with accuracy from a composite signal which contains a DC component combined with the AC component. The circuit comprises a comparing amplifier circuit connected to receive such a composite signal at an input terminal thereof via a capacitor, means connected to the other input terminal of the comparing amplifier circuit for providing a reference voltage to the latter, and a clamping circuit for clamping the signal which has passed the capacitor to the reference voltage.

Abstract: Disclosed is a signal processing apparatus comprising a sensor whose impedance varies according to changes in quantity sensed thereby, a power source applying a voltage to the sensor, a current/voltage conversion circuit for converting an output of current flowing through the sensor to a voltage signal, and a feedback means for passing a current corresponding to the output voltage of the current/voltage conversion circuit through the sensor.

Abstract: A photoelectric touch panel comprising arrays of equally spaced light emitting elements and photosensitive elements disposed in a frame configuration on the circumference of a CRT display screen in which a matrix of infrared beams is formed in front of the screen. The photoelectric touch panel has a light shielding plate formed into a comblike shape disposed such that each comb tooth thereof is interposed between said photosensitive elements.

Abstract: A communication apparatus is used in a radio control apparatus for remotely controlling the locking and unlocking of the doors or trunk of a vehicle and other uses. In this communication apparatus, a leader pulse having a predetermined duration is transmitted from the transmitter to the receiver prior to transmission of data. The receiver is intermittently operated for a period shorter than the duration of the leader pulse by periodic operating pulses issued for connecting its circuits to a battery power source, and detects the transmission of a leader pulse in order to hold the receiver in the operating condition for a predetermined period sufficient to receive the following data pulses.

Abstract: In a vehicle speed control apparatus for an internal combustion engine vehicle, in which the first amount of fuel supply required for maintaining the vehicle speed at a desired speed and the second amount of fuel supply corresponding to the amount of depression of an accelerator pedal are separately calculated, the apparatus comprises a selector for selecting the larger of the first and second amount of fuel supply to control the fuel adjusting member, and a modifying circuit for modifying the output data showing the first amount of fuel supply to cause it to slowly change, taking into account the value of the second data showing the second amount of fuel supply just before the second amount of fuel supply becomes smaller than the first amount of fuel supply, whereby the vehicle speed is prevented from being rapidly decelerated when the mode of vehicle speed control is changed from that by the second data to that by the first data.

Abstract: In a capacitive-type switch having two capacitive levels, a relatively thin blade of a desired dielectric material is interposed between two capacitive plates by downward actuation of a push-button switch so that the plates become separated by the blade. When the push button is released, the blade is removed from between the two capacitive plates and a high capacitance level is once again achieved.

Abstract: A printer which includes a latent image carrier in the form of an endless belt, a carriage moveable parallel to a lengthwise dimension of the endless belt, and a paper transport device for moving a sheet of paper perpendicular to the direction of movement of the belt. Mounted on the carriage is a condition control mechanism for putting the latent image carrier in a condition ready for writing a latent image on it, a writing mechanism for forming a latent image on the latent image carriage, a transfer unit for transferring a toner image from the latent image carrier to a recording medium, and a fixing unit for fixing the toner image on the recording medium. After a write operation, the belt is rotated on-half its length and held immoveable.

Abstract: In a motor speed controll apparatus for a DC motor, there are provided a frequency signal generating circuit for outputting a signal at a time period corresponding to a rotation speed of a motor, a sawtooth wave output circuit for outputting a sawtooth wave, the voltage of which increases in a constant time-constant at said time period, a holding circuit for holding a substantially peak voltage of said sawtooth wave as a signal voltage corresponding to the rotation speed of the motor, a differential amplifier circuit for comparing said signal voltage with a speed setting voltage and for outputting a speed control signal in accordance with a difference in this comparison, said speed control signal being supplied to a motor drive apparatus, an amplifier circuit interposed between the output of said holding circuit and input of said differential amplifier circuit, and an operation control circuit for controlling said amplifier circuit to an operative mode and a non-operative mode selectively, the motor being dri

Abstract: A transistor protective circuit includes a transistor transmitting a current to a load to drive same, and a switching element provided in a preceding stage of the transistor and responsive to an abnormal current in the load to turn off the transistor to protect it against destruction.

Abstract: A brushless motor is disclosed having a plurality of stator coils disposed circumferentially around a rotatable shaft and a rotor magnet supported to a yoke fixed to the rotatable shaft and opposed to the stator coils. A radial bearing, for radially supporting the shaft, is supported at the center of a coil supporting member supporting the plurality of stator coils. The coil supporting member is formed integral with the radial bearing and is fixed to a casing having a thrust bearing at its center for axially supporting the shaft. Thus, the relative positional accuracy between the stator coil, thrust bearing, and radial bearing can be made high resulting in a stable rotating speed.

Abstract: An automobile remote-control system is disclosed.

Abstract: In a shield structure of an electronic equipment including a printed circuit board on which electronic parts are mounted, a box having an upper opening for receiving the printed circuit board, and a shielding planar cover for shieldably covering the upper opening of the box, the cover being soldered at its peripheral edge to a side wall of the box; the improvement is characterized in that the peripheral edge of the cover is arcuately downwardly bent.