Abstract: A method of issuing a wireless tag includes a step of printing visual information corresponding to at least part of predetermined information to be stored in a nonvolatile memory of the tag on an image recording area of the tag, a step of writing the predetermined information into the memory by transmitting the information to the wireless tag by radio, and a step of reading the information written into the memory therefrom by radio and checking the read information with the predetermined information before writing. The number of checks made on a wireless tag is counted. A wireless tag for which the number of checks made reaches a predetermined number is recalled as defective.

Abstract: A wireless data storage medium comprising an image recording section for rewritably recording and displaying a visible image, and wireless data storage means less in flexibility produced by bonding the wireless data storage section with the image recording section in such a manner that only part of a whole structure of the wireless data storage section is superposed on part of a whole structure of the image recording section, for storing and reading data on a memory for storing data by performing communication with an external system by use of the memory and an antenna.

Abstract: A no-battery information storage medium has a radio communication function of receiving power while receiving an externally transmitted radio wave as modulated data, and transmitting data outside the medium. One transmission/reception antenna coil performs transmission/reception. A first full-wave rectifying circuit is constituted by four rectifying elements connected to each other by bridging connection and connected to the two terminals of the transmission/reception antenna coil. A second full-wave rectifying circuit is constituted by four rectifying elements, including two shared rectifying elements of the four rectifying elements constituting the first full-wave rectifying circuit, connected to each other by bridging connection and connected to the two terminals of the transmission/reception antenna coil. A power generating section is connected to the output of the first full-wave rectifying circuit to generate power to be used inside the information storage medium.

Abstract: An information processing apparatus has a transmission antenna and a reception antenna and performs radio transmission/reception with a radio card via the two antennas, thereby performing predetermined information processing. Each of the transmission antenna and reception antenna is formed of a loop antenna. Both antennas are made to overlap each other by a predetermined length so as to prevent mutual electromagnetic interference and are situated in substantially the same plane. Accordingly, even if the transmission antenna and reception antenna are situated close to each other, a signal radiated from the transmission antenna is prevented from interfering with the reception antenna. Thus, the reception antenna can surely receive only a signal radiated from the radio card or an object of communication.

Abstract: A reader/writer transmits power and modulated data to a no-battery information storage medium having a communication function in a noncontact state, and receives modulated data from the no-battery information storage medium. The reader/writer has a driver, a loop antenna, and a current detection unit. The driver transmits the power and the modulated data. The loop antenna is connected to the output line of the driver. The current detection unit is arranged between the loop antenna and the output line of the driver. While the reader/writer supplies a transmission carrier current from the driver to the loop antenna, if it receives the modulated data from the no-battery information storage medium, it uses the current detection unit to extract, as a reception signal, a change in transmission carrier current of the loop antenna caused by the modulated data signal received by the loop antenna.

Abstract: A wireless communication system performs wireless transmitting and receiving of data between first and second communication devices. The device transmits from the first communication device to the second communication device a prescribed signal by a prescribed carrier signal having a prescribed carrier frequency. The prescribed signal transmitted from the first communication device is received in the second communication device. The device generates in the second communication device a signal of prescribed frequency which is phase synchronous with the prescribed carrier signal. Transmission data is spread spectrum modulated using the signal of prescribed frequency generated in the generating step. The spread spectrum modulated signal is transmitted from the second communication device to the first communication device. The first communication device receives the spread spectrum modulated signal transmitted from the second communication device.

Abstract: A first full-wave rectifier circuit generates a power supply voltage from a received modulated radio wave signal and a second full-wave rectifier circuit binarizes the voltage to obtain a binary signal. A continuous clock signal is generated from the binary signal. The modulated radio wave signal is also binarized and demodulated using the continuous clock signal. This demodulation is performed simultaneously with the generation of the power supply voltage. A command can be received continuously and data can be read or written continuously. Therefore, the reception of power or the reception/transmission of data need not be performed intermittently, but rather a large amount of data can be received or transmitted continuously at high speed.

Abstract: A read request signal containing a command, an address, etc. is subjected to two-phase modulation with the first carrier of a first frequency and the resultant signal is then transmitted to a radio card. After the transmission of the read request signal, the first carrier is kept transmitted to the radio card. Upon reception of the read request signal, the radio card generates a power supply voltage and an operation clock and sends response data to the read request signal to a radio card reader/writer. Unlike in the prior art, therefore, the reception of power or the reception/transmission of data need not be performed intermittently so that a large amount of data can be received or transmitted continuously at a high speed.

Abstract: An optical disk apparatus records data on an optical disk or reproduces data therefrom. The optical disk has a plurality of zones each including a plurality of tracks, and the optical disk apparatus records or reproduces data with respect to the zones on the basis of clock signals having different frequencies. The optical disk apparatus comprises first and second phase comparators. The first phase comparator is a pull-in type and outputs a signal corresponding to the phase difference between a clock signal generated by a PLL circuit and a binary signal of reproduction data. The second phase comparator is a lock-in type and outputs a signal corresponding to the phase difference between a signal obtained by frequency-dividing the clock signal generated by the PLL circuit and a signal obtained by frequency-dividing a fundamental clock signal.

Abstract: The recording scheme of an optical disk is initially determined by a cartridge identifier housing the optical disk. The optical disk is then rotated at a rotational speed corresponding to the initially determined recording scheme, and a signal processing circuit is switched. Management data recorded on the optical disk is read to also determine the recording scheme, thereby improving the reliability of the determination. When no management data can be read, a recording scheme and associated rotational speed are changed. The management data representing the recording scheme is then read according to the changed recording scheme. A medium type determined based on the management data has priority over that of the medium type obtained by the identifier of the cartridge.

Abstract: An apparatus, having a spindle motor for rotating a circular optical disk, for recording information on the optical disk rotated by the spindle motor, and reproducing information recorded on the optical disk, wherein whether the recording scheme of the optical disk is a mark interval or mark length recording scheme is discriminated, and information is recorded or recorded information is reproduced while the optical disk is rotated at a rotational speed corresponding to the discriminated recording scheme. In an apparatus for recording/reproducing information in accordance with both the mark interval and mark length recording schemes, a signal amplifier, a demodulation circuit, a modulation circuit, an error correction circuit, a buffer memory, an interface circuit, and the like can be commonly used between the two recording schemes, thereby decreasing the number of signal processing circuits.

Abstract: A laser driver outputs a drive current. A high frequency current generated by a HF current generator is superimposed to the drive current via a coupling capacitor. A laser diode is driven by the high-frequency-current superimposed drive current. This superimposed drive current has a period for performing a laser oscillation at the laser diode and a period for stopping the laser oscillation. The laser light is reflected at the surface of an optical disk and returned to the laser diode. When the reflected laser light is returned to the laser diode, the laser diode is in the laser oscillation stopping period of the superimposed drive current.

Abstract: In an apparatus for optically recording data on and reproducing it from an optical disk, the level of a laser beam in reproducing mode is subjected to feedback control and the level of a laser beam in recording mode is controlled in accordance with the output of a capacitor which stores the level of the laser beam in reproducing mode. This apparatus monitors the output of a photodetector in a feedback circuit, which receives reflection light from the optical disk, and disables emission of a laser beam when a predetermined amount of light is not detected in recording or reproducing mode.

Abstract: A memory device for recording information on a recording medium includes a recording mechanism for recording information on the recording medium. A control device controls the recording mechanism such that information is recorded in a first predetermined arrangement on a first portion of the recording medium and in a second predetermined arrangement on a second portion of the recording medium.

Abstract: An information recording medium of this invention comprises a plurality of concentric tracks or a spiral track, having a plurality of recording tracks for recording information, and record pits formed on the recording tracks, said record pits being formed at a predetermined pitch on an innermost recording track, and said record pits being formed in accordance with movement of a position of a target recording track from the innermost track toward an outermost track, while gradually increasing the predetermined pitch at a rate less than that at which linear velocity increases when said information recording medium is rotated at a constant velocity.

Abstract: A magneto-optical data reading member includes a transparent disk substrate, and land-shaped areas formed on the disk substrate in a spiral manner so as to be parallel with each other, and groove-shaped areas formed to be stepped with respect to the land-shaped areas, wherein each of the land-shaped and groove-shaped areas has, in a surface region thereof, a first magnetic film for reading data having a predetermined Curie temperature and a predetermined magnetic coercive force, and a second magnetic film for reading data, formed on the first magnetic film, having a Curie temperature higher than the predetermined Curie temperature and a magnetic coercive force higher than the predetermined magnetic coercive force, and having a plurality of memory pits in series according to the information data to be recorded.

Abstract: An information recording apparatus includes a rotating section for rotating an optical disk at a constant angular velocity, the disk including a spiral recording track or concentric recording tracks, a recording section for recording information with a light beam irradiated on the recording tracks of said optical disk, the light beam having an arbitrary recording frequency, and control means for controlling the recording section such that the information is recorded on the optical disk while a pitch between adjacent record pits is elongated as a position of a recording track is moved from an innermost track toward an outermost track, the pitch at the innermost track being a first pitch, the pitch at the outermost track being a second pitch, the pitch at a track between the innermost and outermost tracks being longer than the first pitch and shorter than the second pitch, and the second pitch being shorter than a third pitch expected at the outermost track when the optical disk is rotated at the constant angul

Abstract: In an apparatus for optically recording data on and reproducing it from an optical disk, the level of a laser beam in reproducing mode is subjected to feedback control and the level of a laser beam in recording mode is controlled in accordance with the output of a capacitor which stores the level of the laser beam in reproducing mode. This apparatus monitors the output of a photodetector in a feedback circuit, which receives reflection light from the optical disk, and a current flowing through a drive transistor for supplying a drive signal to the laser source. When a large amount of light or a large drive current is detected in a standby mode or in a period in which the optical disk is rotated in a low speed, emission of the laser beam is disabled and the kind of malfunction is recorded.

Abstract: Prior to emitting a light beam from an optical head, an information recording apparatus moves the optical head in the direction of the optical axis so as to render the light beam in a defocused state on an optical recording medium. Then, the size of the emitted light beam is detected by a detector.

Abstract: An optical disk apparatus includes an optical head for converting light reflected from an optical disk into a photoelectric signal, a linear motor for moving the optical head along a radial line of the optical disk and a position determining circuit for determining the position of a track on the basis of track information contained in the photoelectric signal. The distance between the present track that the optical head faces and a target track to which the optical head is to be moved is updated by moved distance information of the optical head. Reference speed information is read out of a memory addressed by the distance information. The speed of the linear motor is speed controlled in accordance with the reference speed information so that the optical head is moved to the target track.