Abstract: A gas ejection apparatus ejects gas by use of a compressor that compresses the gas, and the gas ejection apparatus includes a detector and a microcomputer. The detector detects a signal relating to an ejection target device. The microcomputer controls the compressor to change a number of times of ejection of the gas in accordance with an amount of time elapsing between a detection of the signal by the detector and a next detection of the signal by the detector.

Abstract: A gas ejection apparatus ejects gas by use of a compressor that compresses the gas, and the gas ejection apparatus includes a detector and a microcomputer. The detector detects a signal relating to an ejection target device. The microcomputer controls the compressor to change a number of times of ejection of the gas in accordance with an amount of time elapsing between a detection of the signal by the detector and a next detection of the signal by the detector.

Abstract: A gas ejection apparatus ejects gas by use of a compressor that compresses the gas, and the gas ejection apparatus includes a detector and a microcomputer. The detector detects a signal relating to an ejection target device. The microcomputer controls the compressor to change a number of times of ejection of the gas in accordance with an amount of time elapsing between a detection of the signal by the detector and a next detection of the signal by the detector.

Abstract: A gas ejection apparatus ejects gas using a compressor that compresses the gas by a rotating body inside a cylinder, and includes a detector and a microcomputer. The detector detects a position of the rotating body inside the cylinder based on positions of gears which are coupled to the rotating body. When the microcomputer receives an ejection instruction, the microcomputer controls intake and exhaust of the compressor according to detection results of the detector, and causes the compressor to wait in an intake completion state upon completion of ejection of the gas that was performed in response to the ejection instruction.

Abstract: A controller includes a position detecting unit, switching unit, vibration controlling unit, and vibration detecting unit. The position detecting unit detecting a contact position with an operation surface. The switching unit switches between vibration and detection modes of at least one vibration element in accordance with temporal change in contact position detected by position detecting unit, the vibration mode being a mode wherein at least one vibration element vibrates, and detection mode being a mode wherein at least one vibration element detects vibration. The vibration controlling unit causes one or more first vibration elements to vibrate so as to vibrate the operation surface, at least one vibration element including one or more first vibration elements. The vibration detecting unit detects an operation surface's vibration based on vibration's detection results detected by one or more second vibration elements, at least one vibration element including the one or more second vibration elements.

Abstract: A gas ejection apparatus ejects gas by use of a compressor that compresses the gas, and the gas ejection apparatus includes a detector and a microcomputer. The detector detects a signal relating to an ejection target device. The microcomputer controls the compressor to change a number of times of ejection of the gas in accordance with an amount of time elapsing between a detection of the signal by the detector and a next detection of the signal by the detector.

Abstract: A gas ejection apparatus ejects gas using a compressor that compresses the gas by a rotating body inside a cylinder, and includes a detector and a microcomputer. The detector detects a position of the rotating body inside the cylinder based on positions of gears which are coupled to the rotating body. When the microcomputer receives an ejection instruction, the microcomputer controls intake and exhaust of the compressor according to detection results of the detector, and causes the compressor to wait in an intake completion state upon completion of ejection of the gas that was performed in response to the ejection instruction.

Abstract: A controller includes a position detecting unit, switching unit, vibration controlling unit, and vibration detecting unit. The position detecting unit detecting a contact position with an operation surface. The switching unit switches between vibration and detection modes of at least one vibration element in accordance with temporal change in contact position detected by position detecting unit, the vibration mode being a mode wherein at least one vibration element vibrates, and detection mode being a mode wherein at least one vibration element detects vibration. The vibration controlling unit causes one or more first vibration elements to vibrate so as to vibrate the operation surface, at least one vibration element including one or more first vibration elements. The vibration detecting unit detects an operation surface's vibration based on vibration's detection results detected by one or more second vibration elements, at least one vibration element including the one or more second vibration elements.

Abstract: A focus error signal which is a differential signal indicative of a difference between a sum of amounts of reflected light detected by photodetector elements A and C of a four-split photodetector, and that of amounts of reflected light detected by photodetector elements B and D is measured. The level of the focus error signal at a timing when the amount of reflected light from the optical disc and detected by the four-split photodetector is at the maximum is set as a reference level. The gains of amplifiers 23 and 24 are individually adjusted so that the maximum and minimum values of the focus error signal are substantially symmetrical about the reference level. According to the configuration, the focus control can be performed by using the balance-adjusted focus error signal, and therefore can be stably conducted.

Abstract: According to the method, the focusing servo is activated at the zero-crossing point of a focusing error signal FE immediately after the focusing error signal FE has exceeded the first threshold th1 or has dropped below the second threshold th2. The absolute value of the first threshold th1 and the second threshold th2 is reduced each time a predetermined time t is elapsed until the focusing servo is activated.

Abstract: In a focusing servo apparatus for an optical pickup, an S-shaped wave of a focus error signal is measured at a point of time T1 to thereby calculate the time &Dgr;t1 required for shifting the position on the S-shaped wave from a local maximum value to a local minimum value. The speed of a lens relative to an optical disk is measured on the basis of the time &agr;t1. When the relative speed of the lens is higher than the speed allowed to lead the focus in, the motion of the lens is braked just before (a point of time T1′) the optical disk makes one rotation to thereby reduce the relative speed of the lens to make it possible to lead the focus in the optical disk steadily.

Abstract: Focusing balance adjustment of adjusting a servo mechanism is executed so that reproduction quality is optimum in a state where a focusing servo is active (#5). Thereafter, tracking balance adjustment of adjusting the servo mechanism is executed so that a tracking balance deviation is cancelled which is an amplitude difference between the upper side and lower side relative to a reference level of a waveform generated in a tracking error signal when the focal point of a light beam applied to the disk crosses a track of the disk (#7).

Abstract: A disk reading apparatus includes a binarizing unit 5 for binarizing a tracking error signal 21 with a hysteresis width and for generating a track count signal 22, a jump unit 8 for causing track-jump on the basis of the track count signal 22, a malfunction detecting unit 9 for transmitting a malfunction signal 24 when level inversion occurs to the track count signal 22 while follow of the track is being implemented, and a control unit 15 for widening the hysteresis width when the pickup 1 is caused to follow the track, and for narrowing the hysteresis width when the pickup 1 is caused to track-jump.

Abstract: A focus error signal which is a differential signal indicative of a difference between a sum of amounts of reflected light detected by photodetector elements A and C of a four-split photodetector, and that of amounts of reflected light detected by photodetector elements B and D is measured. The level of the focus error signal at a timing when the amount of reflected light from the optical disc and detected by the four-split photodetector is at the maximum is set as a reference level. The gains of amplifiers 23 and 24 are individually adjusted so that the maximum and minimum values of the focus error signal are substantially symmetrical about the reference level. According to the configuration, the focus control can be performed by using the balance-adjusted focus error signal, and therefore can be stably conducted.

Abstract: Focusing balance adjustment of adjusting a servo mechanism is executed so that reproduction quality is optimum in a state where a focusing servo is active (#5). Thereafter, tracking balance adjustment of adjusting the servo mechanism is executed so that a tracking balance deviation is cancelled which is an amplitude difference between the upper side and lower side relative to a reference level of a waveform generated in a tracking error signal when the focal point of a light beam applied to the disk crosses a track of the disk (#7).

Abstract: According to the method, the focusing servo is activated at the zero-crossing point of a focusing error signal FE immediately after the focusing error signal FE has exceeded the first threshold th1 or has dropped below the second threshold th2. The absolute value of the first threshold th1 and the second threshold th2 is reduced each time a predetermined time t is elapsed until the focusing servo is activated.

Abstract: In a focusing servo apparatus for an optical pickup, an S-shaped wave of a focus error signal is measured at a point of time T1 to thereby calculate the time &Dgr;t1 required for shifting the position on the S-shaped wave from a local maximum value to a local minimum value. The speed of a lens relative to an optical disk is measured on the basis of the time &agr;t1. When the relative speed of the lens is higher than the speed allowed to lead the focus in, the motion of the lens is braked just before (a point of time T1′) the optical disk makes one rotation to thereby reduce the relative speed of the lens to make it possible to lead the focus in the optical disk steadily.

Abstract: In a disk drive device, a CPU of a CD-R drive starts acceleration from low rotational driving towards a target rotational speed in a condition in which a tracking servo is in an OFF condition and simultaneously starts counting a number of tracking errors prior to performing recording or reproduction. Upon comparison of the number of counts and a specified threshold for determining vibration, in case the number of counts has exceeded the threshold, the tracking servo are turned ON for performing recording or reproduction at a rotational speed that is lower than the target rotational speed.

Abstract: A disk reading apparatus includes a binarizing unit 5 for binarizing a tracking error signal 21 with a hysteresis width and for generating a track count signal 22, a jump unit 8 for causing track-jump on the basis of the track count signal 22, a malfunction detecting unit 9 for transmitting a malfunction signal 24 when level inversion occurs to the track count signal 22 while follow of the track is being implemented, and a control unit 15 for widening the hysteresis width when the pickup 1 is caused to follow the track, and for narrowing the hysteresis width when the pickup 1 is caused to track-jump.

Abstract: An optical disc apparatus includes an optical pickup. When an optical disc is mounted, a focus search is carried out for a lens provided on the optical pickup, and the optical disc is discriminated as to its disc type. At this time, an AGC circuit of an RF amplifier is turned off. The reproduced signal from the RF amplifier is compared with a constant voltage. A measurement is made for a time for which an output from the comparator is at a high level. The high level time is compared with a reference time, thereby discriminating the type of the optical disc.