Abstract: An inspection method for a recordable optical disc includes focusing laser light on a recording layer and obtaining a data signal dependent on the laser light reflected by the recording layer. The inspection method also includes determining whether the optical disc includes a defect or not by identifying a first period every second period in the obtained data signal obtained, the first period being a period in which a signal level of the data signal is lower than a predetermined value, and each of the second periods corresponding to an ECC block, and outputting a result of the determination.

Abstract: An inspection method for a recordable optical disc includes focusing laser light on a recording layer and obtaining a data signal dependent on the laser light reflected by the recording layer. The inspection method also includes determining whether the optical disc includes a defect or not by identifying a first period every second period in the obtained data signal obtained, the first period being a period in which a signal level of the data signal is lower than a predetermined value, and each of the second periods corresponding to an ECC block, and outputting a result of the determination.

Abstract: The present invention provides a signal processing device for optical discs that is capable of more accurately check signal quality at a higher speed than the conventional technique, even if a playback RF signal is deteriorated. A short recording mark detecting unit 115 detects short recording marks in an RF signal read from an optical disc 101, the short recording mark counting unit 116 counts a first short recording mark number as the number of the detected short recording marks, an error number counting unit 110 counts errors in the RF signal, an error number converting unit 111 converts the number of the errors to a second short recording mark number equivalent to the number of the errors, and a signal quality judging unit 112 judges recording quality based on a total of the first and second short recording mark numbers.

Abstract: A disk drive apparatus for a disk having helically-formed or concentric circle-like formed tracks includes a spindle motor for controlling a rotation of the disk; a pick-up device for recording or reproducing information on or from the disk; a stepping motor for moving the pick-up device in a radial direction of the disk in accordance with a drive current; a system controller for tracking a rotation speed of the spindle motor and for outputting command signals according to the rotation speed of the spindle motor; and a stepping motor controller for controlling the stepping motor by changing a slope of a rising part and a falling part of a waveform of the drive current of the stepping motor according to the command signals.

Abstract: A disk apparatus includes a pick-up for reading/writing signals from/on a disk; a pick-up base provided with the pick-up; a traverse motor for moving the pick-up in a radial direction of said disk; a feed screw rotated by the traverse motor and provided with a thread groove on its periphery; a rack having a fixing portion fixed to the pick-up base and a nut portion engaged with the thread groove; a guiding mechanism for guiding the pick-up movably in a radial direction of the disk; and a cantilever parallel spring for connecting the fixing portion to the nut portion of the rack, displaceably in a radial direction of the feed screw.

Abstract: In a DVD player, when data information in a DVD disk is played back, it is judged whether the data information is protected by a copyright or not on the basis of disk control information. Further, it is judged whether the DVD disk is writable or not, based on whether the DVD disk is provided with a wobble or not. Thus, if the data information is protected by the copyright and the DVD disk is writable, a playback of the DVD disk is prevented so that an illegal use of the DVD disk, which infringes the copyright, is effectively prevented.

Abstract: A driving circuit of a liquid crystal display device includes driver output lines connected to outputs of a data line driver, m pieces of block selection signal lines for sequentially selecting m pieces of blocks, and data lines for supplying data to a display area. A switch sequentially connects an ith driver output line to ith, i+2jth, . . . , and i+2jx(m?1)th data lines in response to signals on the m pieces of block selection signal lines when j is a positive integer smaller than m.

Abstract: An information recording method of recording information, in which laser light is applied to a recording medium while depending on predetermined information said laser light is modulated and the intensity of said light is controlled to form recording mark areas at which reflectivity of said recording medium changes, depending on the intensity of said applied light, wherein before starting data recording, said light is applied to said recording medium at predetermined light intensity, reflection light from said recording mark areas of said recording medium is received, the amount of said reflection light is detected, and a light intensity controlling reference value is calculated on the basis of the amount of said detected light, and during data recording, reflection light from said recording mark areas of said recording medium is received, the amount of said reflection light is detected, and a light intensity controlling detection value is calculated on the basis of the amount of said detected light, correcte

Abstract: In order to determine a laser emission waveform rule for a recording medium, such as a write-once optical disc, the present invention provides an information recording apparatus, an information recording method and an information recording system capable of determining optimal recording conditions by recording data for approximately one rotation, by reproducing the recorded area, by measuring a phase error for each combination of the length of a mark and the length of a space immediately before or after the mark and by changing an emission waveform rule on the basis of the measured phase error.

Abstract: A disk drive apparatus for a disk having helically-formed or concentric circle-like formed tracks includes a spindle motor for controlling a rotation of the disk; a pick-up device for recording or reproducing information on or from the disk; a stepping motor for moving the pick-up device in a radial direction of the disk in accordance with a drive current; a system controller for tracking a rotation speed of the spindle motor and for outputting command signals according to the rotation speed of the spindle motor; and a stepping motor controller for controlling the stepping motor by changing a slope of a rising part and a falling part of a waveform of the drive current of the stepping motor according to the command signals.

Abstract: A liquid crystal display panel of the active matrix drive type is disclosed. Each pixel is provided with an storage capacitor, wherein capacitors for stabilizing the voltage are added to the common storage capacitor bus line that applies a predetermined potential to the storage capacitor bus lines provided for each of the rows to absorb noise that mixes into the storage capacitor bus lines through parasitic capacitances, thereby to decrease fluctuation in the voltage of the storage capacitor bus lines and to prevent the occurrence of display unevenness and crosstalk. Capacitors Ccs for stabilizing the voltage are added to a common storage capacitor bus line (vertical Cs line) 5 that applies a predetermined potential (storage capacitor bus line voltage Vcs) to the storage capacitor bus lines (horizontal Cs lines) 4 provided for each of the rows to form a common side of the storage capacitors Cs formed in each of the pixels.

Abstract: A disk apparatus includes a pick-up for reading/writing signals from/on a disk; a pick-up base provided with the pick-up; a traverse motor for moving the pick-up in a radial direction of said disk; a feed screw rotated by the traverse motor and provided with a thread groove on its periphery; a rack having a fixing portion fixed to the pick-up base and a nut portion engaged with the thread groove; a guiding mechanism for guiding the pick-up movably in a radial direction of the disk; and a cantilever parallel spring for connecting the fixing portion to the nut portion of the rack, displaceably in a radial direction of the feed screw.

Abstract: A liquid crystal display device includes a display circuit having data lines and scanning lines arranged in two-dimensional matrix, and switching elements connected between the data lines and the scanning lines. A first inspection circuit is also provided, including an inspection voltage input and/or output terminal for inputting and/or outputting an inspection voltage to/from one ends of the data lines via a first analog switch. A second inspection circuit includes an inspection voltage input and/or output terminal for inputting and/or outputting an inspection voltage to/from the other ends of the data lines. The display circuit, the first inspection circuit, and the second inspection circuit are provided on one substrate, and the first inspection circuit is constructed to be separated from the rest of the display circuit.

Abstract: An LCD apparatus has a control circuit 40 which makes a timing of the rear edges of scanning pulses provided to predetermined scanning lines coincide with the time when the display potential is renewed, wherein each of the predetermined scanning lines corresponds to an addition of a picture line to a picture or a reduction from two picture lines to one picture line on a picture in order to compensate for a difference between the number of scanning lines of the LCD and the number of lines of the picture to be displayed. In the control circuit, a circuit detects cycle times of the vertical and horizontal sync pulses, an MPU determines the reference value REF on the basis of the detected value and count CH of the horizontal sync pulse *HS from a counter, and a circuit generates a signal AE which makes the time when the pulse count CD of pixel clock CLKD from the counter becomes equal to the REF that coincides with the timing of the rear edge of scanning pulse.

Abstract: An information recording method of recording information, in which laser light is applied to a recording medium while depending on predetermined information said laser light is modulated and the intensity of said light is controlled to form recording mark areas at which reflectivity of said recording medium changes, depending on the intensity of said applied light, wherein

Abstract: In a method of the present invention for controlling stepping motor, the stepping motor driving current is increased or reduced at a fixed inclination in proportion to the time to control the stepping motor effectively, and, a stepping motor driving current pattern is changed by ¼ cycle or more to synchronize the state of excitation between the stepping motor driving means and the stepping motor to control the pick-up very accurately. In addition, the disk apparatus of the present invention, which uses a stepping motor is provided with a pulse rate pattern variable means, a pulse rate change proportion measuring means, and a driving voltage variable means, and when the pulse rate and the pulse rate change proportion are low, the driving voltage amplitude is lowered to reduce surplus torque generation in the stepping motor.

Abstract: A disk apparatus includes a disk having helically-formed tracks and storing information on said tracks; a motor for rotating said disk; a pick-up means having a focus servo means and a tracking servo means for reading information recorded on said disk by following the information stored on said tracks; traverse means having a stepping motor for moving said pick-up means by a specified distance; pulse generating means for generating pulse signals for controlling said stepping motor; stepping motor driving means for driving said stepping motor according to said pulse signals received from said pulse generating means; a step-out detecting means for detecting a step-out of said stepping motor; and a driving voltage changing means for changing a driving voltage of said stepping motor when said step-out detecting means detects the step-out in said stepping motor driving means.

Abstract: A liquid crystal display panel of the active matrix drive type in which each pixel is provided with an storage capacitor, wherein capacitors for stabilizing the voltage are added to the common storage capacitor bus line that applies a predetermined potential to the storage capacitor bus lines provided for each of the rows to absorb noise that mixes into the storage capacitor bus lines through parasitic capacitances, thereby to decrease fluctuation in the voltage of the storage capacitor bus lines and to prevent the occurrence of display unevenness and crosstalk. Capacitors Ccs for stabilizing the voltage are added to a common storage capacitor bus line (vertical Cs line) 5 that applies a predetermined potential (storage capacitor bus line voltage Vcs) to the storage capacitor bus lines (horizontal Cs lines) 4 provided for each of the rows to form a common side of the storage capacitors Cs formed in each of the pixels.

Abstract: In order to determine a laser emission waveform rule for a recording medium, such as a write-once optical disc, the present invention provides an information recording apparatus, an information recording method and an information recording system capable of determining optimal recording conditions by recording data for approximately one rotation, by reproducing the recorded area, by measuring a phase error for each combination of the length of a mark and the length of a space immediately before or after the mark and by changing an emission waveform rule on the basis of the measured phase error.

Abstract: A liquid crystal display device comprises: a display circuit including data lines and scanning lines arranged in a two-dimensional matrix, and switching elements connected between the data lines and the scanning lines; a first inspection circuit including an inspection voltage input and/or output terminal for inputting and/or outputting an inspection voltage to/from one end of the data line via a first analog switch; and a second inspection circuit including an inspection voltage input and/or output terminal for inputting and/or outputting an inspection voltage to/from the other end of the data line. The display circuit, the first inspection circuit, and the second inspection circuit are provided on one substrate, and the first inspection circuit is separable from the display circuit.