摘要:
According to the present invention, an optimum value of a laser power for recording data on a high-density optical disk can be set with high accuracy. A test signal whose erase power Pe is fixed and recording power Pw is varied is recorded on the optical disk. The recorded signal is reproduced and a β value representing asymmetry of the reproduced signal is obtained for each recording power. An optimum recording power Pwo is set from a recording power with which the obtained β value becomes a target β value. Hereby, the fixed erase power Pe is determined from measurement results of a value of a modulation factor M of another test signal recorded. Alternatively, the fixed erase power Pe follows strategy information defined in advance for the optical disk. Or Pe≈0 is used regardless of the optical disk.
摘要:
An objective of the present invention is to enhance reliability of recorded data by preventing deterioration of OPC (Optimum Power Calibration) accuracy due to an influence of inter-layer interference in an optical disk device capable of writing in a multilayer optical disk. Aiming at the objective, a relationship between asymmetry and a signal modulation depth, which are measured by use of a standard driver is referred, and thereby an offset caused by a device, a disk, a writing state of another layer and the like is compensated. Thus, OPC is executed.
摘要:
An objective of the present invention is to enhance reliability of recorded data by preventing deterioration of OPC (Optimum Power Calibration) accuracy due to an influence of inter-layer interference in an optical disk device capable of writing in a multilayer optical disk. Aiming at the objective, a relationship between asymmetry and a signal modulation depth, which are measured by use of a standard driver is referred, and thereby an offset caused by a device, a disk, a writing state of another layer and the like is compensated. Thus, OPC is executed.
摘要:
An image forming apparatus includes: an image carrier that is rotatably arranged and carries an image on an outer circumferential surface thereof; a transfer member that is rotatably arranged to face the image carrier and transfers the image carried on the image carrier onto a sheet held between the transfer member and the image carrier; a leading edge gripping member that is secured to the transfer member and grips a leading edge side of the sheet in a transport direction thereof on an outer circumferential surface of the transfer member; and a trailing edge holding member that is arranged to be rotatable around the transfer member, holds a trailing edge side of the sheet in the transport direction thereof between the trailing edge holding member and the outer circumferential surface of the transfer member, and bends to release the trailing edge side of the sheet in the transport direction thereof.
摘要:
The present invention achieves an optical recording and reproducing apparatus focusing two opposed beams of light at a same place in an optical recording medium to record a standing wave generated by interference of the two beams of light. In the apparatus, phase information is recorded in the optical recording medium by a phase modulating means for modulating phase of one of the two beams of light. The reproduction reference light generated from a light source is allowed to interfere with reproduced light generated by projecting one of the two beams of light onto the optical recording medium to generate three or more beams of interfering light having different interference phases are simultaneously generated. The three or more beams of interfering light are then detected, and the phase modulated by the phase modulating means is demodulated from an output of the detector.
摘要:
To solve the problem of deterioration in recording quality due to a change of a write waveform caused by changes of temperature and recording powers, aged deterioration and the like. A driver having a function of controlling rise/fall times and an overshoot amount of an optical waveform is used to optimize an optical waveform that changes in recording under the influence of a component of a laser and the like. Specifically, the rise/fall times and the overshoot amount of the optical waveform are optimized by obtaining a waveform control register value from test recording or a table.
摘要:
A solid secondary battery that includes a positive electrode layer, a solid electrolyte layer including an oxide-based solid electrolyte, and a negative electrode layer. At least one of the positive electrode layer and the negative electrode layer, and the solid electrolyte layer are joined by sintering. At least one of the positive electrode layer and the negative electrode layer includes an electrode active material, and a conductive agent containing a carbon material, and the conductive agent includes a carbon material which has a specific surface area of 1000 m2/g or less.
摘要:
A power adjustment method in which a modulation index is calculated from reproduced signals of patterns recorded by irradiating light onto an optical information recording medium with a recording power varied and an optimum power of irradiation light is set up using the modulation index. The power adjustment method includes calculating an optimum value PcO of a predetermined correction term Pc using a relation of a value obtained by subtracting the predetermined correction term Pc from the recording power and the modulation index, finding a value Pth of the recording power at which the modulation index becomes substantially zero in the relation of the value obtained by subtracting the optimum value PcO from the recording power and the modulation index, and setting up a value obtained by multiplying the value of Pth by a predetermined constant as a recording power of each of the recording patterns.
摘要:
A write power adjustment method and optical read/write apparatus for accurate optimum write power setup. Different levels of write power Pwm are used to perform a test write and calculate a modulation Mm corresponding to each level of write power Pwm. Different write power compensated values Pcn are used to calculate an evaluated value Smn=Mm×(Pwm−Pcn). Pcn that maximizes the linearity of the relationship between compensated write power (Pwm−Pcn) and evaluated value Smn is determined as an optimum write power compensated value PcO. Compensated write power PthO that provides a modulation of zero, that is, an evaluated value SmO of zero, when the relationship between compensated write power (Pwm−PcO) for PcO and evaluated value SmO is subjected to linear approximation is determined. PthO and optimum write power compensated value PcO are used to calculate a write power threshold Pth=PthO+PcO. A predetermined calculation is performed on Pth to determine optimum write power Popt. In contrast to a conventional write power adjustment method (κ method), the present invention makes it possible to accurately adjust for the optimum write power even when the optical disc's write power Pwm-to-evaluated value M×Pw relationship is not linear or its modulation M varies.
摘要:
Objectives of the present invention are to prevent a reduction in the accuracy of an OPC which would otherwise occur due to an influence of a change in temperature, and to increase the reliability of a recording data. To this end, in the OPC using a modulation, the OPC is performed with at least one of multiplication coefficients necessary for calculation changed according to temperature.