Abstract: A tilt control method and an optical disc apparatus can perform tilt control after quickly finding the tilt angle of a recording surface at any position in a radial direction of an optical disc corresponding to a rotational velocity of the optical disc during a read/write. A first overall angle of warping ?1 of a recording surface of an optical disc D at a first reference rotational velocity X1 is measured, and a second overall angle of warping ?2 of the recording surface of the optical disc D at a second reference rotational velocity X2 is also measured. An angle of warping increase/decrease coefficient K is calculated based on a ratio of a difference between the first reference rotational velocity X1 and the second reference rotational velocity X2 to a difference between the first overall angle of warping ?1 and the second overall angle of warping ?2.

Abstract: The contents delivery system is capable of delivering multimedia contents efficiently, securely, easily and economically. In the contents delivery system, a data transmitter transmits the contents, and the data transmitter is connected to a communication network. A data receiver receives the contents, and the data receiver is connected to the communication network. The contents are attached to electronic mail, which is transmitted from the data transmitter to the data receiver. Commands for processing the contents in the data receiver are written in the electronic mail. The data receiver has a unit for executing the commands and processing the contents.

Abstract: The optical disk player of the present invention is capable of controlling rotational speed of an optical disk, on the basis of a shape of the optical disk, so as to stably and efficiently write data in and read data from the optical disk. The optical disk player comprises: a motor for rotating the optical disk; and an optical pickup for irradiating a laser beam to the optical disk and receiving a reflected beam reflected therefrom. A CPU analyzes signals included in the reflected beam so as to recognize a shape of the optical disk. A servo processor controls rotational speed of the optical disk on the basis of the shape of the optical disk recognized by the CPU.

Abstract: The commutator is capable of reducing contact resistance between the brush and a commutator, improving efficiency of an electric rotary device and restricting exhaustion of the commutator. The commutator comprises: a plurality of commutating pieces having outer faces; and a plurality of sliding members fixed on the outer faces of the commutating pieces, the sliding members including carbon nano fibers or carbon nano tubes whose outermost layers have electric conductivity.

Abstract: The compact motor is capable of improving characteristics of torque. In the motor, a stator core includes a main core and a sub-core. The main core is constituted by piling a plurality of first core plates, which respectively have first extended pole sections of the same number. The sub-core is provided on the base plate side of the main core and is constituted by at least one second score plate, which has second extended pole sections whose number is less than that of the first extended pole sections of each of the first core plates.

Abstract: The optical disk player is capable of correctly restarting to write data. Data protection means returns an optical pick-up from an interruption address to a synchronization starting address. The data protection means reads data from the synchronization starting address to the interruption address at a reading velocity equal to a former writing velocity. The data protection means restarts writing data from the interruption address if a phase of data read is synchronized with a phase of data to be written. The data protection means returns the optical pick-up to the synchronization starting address and reads data from there to the interruption address at a reading velocity slower than the former writing velocity so as to synchronize the phases if the synchronization is failed.

Abstract: The disk drive unit of the present invention comprises: a main body; a tray including a disk accommodating section in which an optical disk is held, the tray being retracted into and ejected from the main body; and a driving mechanism for driving the tray. The driving mechanism automatically retracts the tray into and ejects the tray from the main body. The driving mechanism moves the tray when the tray is pushed toward inside of the main body. With this structure, no button for ejecting and retracting the tray is required, and the tray can be ejected and retracted by the same action.

Abstract: The method of sampling wobble components of the present invention is capable of realizing a disk drive unit, which can write data at high speed, and reducing manufacturing cost of the disk drive unit. The wobble components are sampled from laser beams reflected from an optical disk so as to write data on the optical disk. The laser beams are low power laser beams for reading data and high power laser beams for writing data. The method is characterized in that the wobble components of the reflected low power laser beams and the reflected high power laser beams are continuously sampled.

Abstract: The image printing system is capable of properly defining amount of ink without adjusting ink clearance. The image printing system includes an offset printing machine, in which proper amount of ink is supplied to a plate drum via an ink fountain roller on the basis of image data. A memory stores the image data of an original image and an ink amount table, in which rotational speed data of the ink fountain roller correspond to rate of area of picture in the original image. A control unit calculates the rate of area of picture on the basis of the image data, reads the rotational speed of the ink fountain roller from the ink amount table on the basis of the rate of area of the picture, corrects the rotational speed so as to define proper control data for rotating the ink fountain roller, and sends the proper control data to the offset printing machine so as to control the amount of ink to be supplied to the plate drum.

Abstract: In the disk drive unit of the present invention, an eject button for ejecting and retracting a tray can be easily pushed while the tray is ejected, and the tray can be ejected and retracted by same action. The disk drive unit comprises: a main body; a tray for holding an optical disk, the tray retracted into and ejected from the main body; a moving mechanism for moving the tray, the moving mechanism including a motor for retracting the tray into and ejecting the same from the main body; and an eject button actuating the moving mechanism so as to eject the tray into and eject the same from the main body, the eject button provided in a front face of the tray.

Abstract: In the disk clamping mechanism of the present invention, a turntable has a columnar section capable of fitting a disk-shaped medium and a circular supporting section capable of supporting the disk-shaped medium. A damper has a circular pressing section and is magnetically drawn toward the turntable so as to hold the disk-shaped medium. A circular hole is formed in the columnar section of the turntable. A positioning boss is provided in the bottom face of the clamper and inserted into the circular hole. An outer circumferential face of the positioning boss is formed into a tapered face. The tapered face contacts an inner edge of the circular hole when the clamper is held on the turntable on which no disk-shaped medium is mounted. The insertion of the positioning boss into the circular hole is stopped when a distance between the pressing section of the clamper and a supporting section of the turntable is shorter than thickness of the disk-shaped medium.

Abstract: The disk player is capable of preventing a shift of an object lens in an optical pickup and a poor action caused by the shift. In the disk player, a first servo mechanism drives a motor, which moves an optical pickup in a radial direction of a disk. A second servo mechanism moves an object lens in a radial direction in the optical pickup so as to trace tracks of the disk. A control unit controls the first and second servo mechanisms so as to move the optical pickup from a current track to an object track. The control unit moves the optical pickup to the object track by the steps of: driving the motor without driving the second servo mechanism so as to move the optical pickup to a track near the object track; driving the second servo mechanism after the optical pickup reaches near the object track; stopping the second servo mechanism; and driving the first servo mechanism and the second servo mechanism after the laps of a prescribed time so as to move the optical pickup to the object track.

Abstract: In a method of reproducing audio signals of the present invention, audio reproducing speed can be changed without changing tone and quality of audio signals. Audio signals are filtered to extract basic audio signals. Zero-cross points in the basic audio signals are detected. The original audio signals are divided into a plurality of frames on the basis of the zero-cross points on a time axis. The frames are thinned out, and the original audio signals are reproduced as voice on the basis of the frames left so as to accelerate reproducing speed. On the other hand, the original audio signals are reproduced by repeating the frame so as to make reproducing speed slower.

Abstract: In a method of reproducing audio signals of the present invention, audio reproducing speed can be changed without changing tone and quality of audio signals. Audio signals are filtered to extract basic audio signals. Zero-cross points in the basic audio signals are detected. The original audio signals are divided into a plurality of frames on the basis of the zero-cross points on a time axis. The frames are thinned out, and the original audio signals are reproduced as voice on the basis of the frames left so as to accelerate reproducing speed. On the other hand, the original audio signals are reproduced by repeating the frame so as to make reproducing speed slower.

Abstract: An audio player is capable of reading written data of introduction parts of groups of sentences written on a recording medium. The audio player includes a reading section for reading written data and a retrieving table. The retrieving table includes data indicating interrelationships between each group of sentences and a reproduction-starting position for each group. An input section allows inputting a command for reading an introduction part of the group of sentences. A memory section is provided for storing the retrieving table. An audio reproducing section converts the written data into audio signals, and a control section oversees the retrieving, reading, and reproducing of the written data.

Abstract: An audio-book player includes a member capable of indicating to a blind person that a recording medium is loaded in or unloaded from the body proper. The audio-book player, which reproduces written data recorded on a recording medium as voice, includes a body proper into which the recording medium can be unloadably loaded and a member for identifying a loading state, in which the recording medium is loaded in the body proper, and an unloading state, in which the recording medium is unloaded therefrom. With this structure, the identifying member identifies the states by changing its tactile impression, so that blind persons can understand the states wherein recording medium is loaded in or unloaded from the body proper.

Abstract: An object of the present invention is to provide an audio player, which is capable of efficiently retrieving writing data of groups of sentences and noticing the present writing data by audio signals. In the audio player, a control section reads a plurality of retrieving tables in a recording medium by a reading section and stores the same in a memory section. The control section selects a selected retrieving table and retrieves the group of sentences therein when the input section inputs commands for selecting the selected retrieving table and retrieving the same. The control section reads a reproduction-starting position of the retrieved group of sentences and the writing data of the retrieved group by the reading section. Then the control section reproduces the writing data thereof, as audio signals, by an audio reproducing section.

Abstract: In a life span detector of the present invention, a current detecting circuit detects current intensity through a laser diode. The current detecting circuits is provided between an electric source and the laser diode. A comparing circuit compares the current intensity detected with a predetermined value. The comparing circuit outputs a predetermined signal when the current intensity detected is greater than the predetermined value. In a compact disc player of the present invention, an optical pick-up includes a laser diode, and a life span detector which detects a life span of the laser diode. By the life span detector, the life span of the laser diode can be timely known. Thus, the occurrence of sound skip and missing data which result from a deteriorated laser diode can be prevented.

Abstract: A disk player, which is capable of making a casing smaller and preventing dust from entering into the casing. The disk player includes a casing having an opening section, through which a disk cartridge is inserted and taken out, in a front face; a door member being pivotably attached ho the casing, the door member being capable of rotating outside of the casing between a first position, at which the door member closes the opening section of the casing, and a second position, at which the door member opens the same; and an elastic member for biasing the door member toward the first position.

Abstract: The object of the present invention is to provide a disk player, which is capable of changing the playing linear velocity by multiple stages to shorten the reading time. The disk player comprises includes an optical pick-up for reading data and outputting data signals; a first clock section for generating master clock signals, the first clock section being capable of changing the frequency of the master clock signals by multiple stages; a second clock section for generating second clock signals; a comparing section for comparing frequency and phase of the master clock signals and the second signals and generating deviation signals; and a drive section for sending drive signals, whose voltage level changes according to voltage changes of the deviation signals, to a motor for rotating a disk, whereby the drive section controls the motor so as to synchronize the frequency and the phase of the second clock signals with those of the master clock signals.