摘要:
The method includes a step of forming a mask having an opening, for forming an opening in multiple insulating films, above a semiconductor substrate on which a member becoming a first insulating film, a member becoming a second insulating film being different from the member becoming the first insulating film, a member becoming a third insulating film, and a member becoming a fourth insulating film being different from the member becoming the third insulating film are stacked in this order; a first step of continuously removing the member becoming the fourth insulating film and the member becoming the third insulating film at a portion corresponding to the opening of the mask; and a second step of removing the member becoming the second insulating film, after the first step, at a portion corresponding to the opening of the mask.
摘要:
It is desired to suitably carry out transmission processing and reception processing carried out when transmitting a multicarrier signal where specific subcarriers are omitted. Therefore, the present invention carries out transmission avoidance processing operable when transmitting a multicarrier signal to replace signals corresponding to subcarriers, in a plurality of subcarriers, at frequency positions where transmission is avoided with a null signal. Subsequently, an inverse Fourier transform is carried out on the output of the transmission avoidance processing, the transmission power of the multicarrier signal that has been transformed is amplified in accordance with the number of subcarriers replaced with the null signal and the multicarrier signal is transmitted. When this multicarrier signal is received, subcarriers where transmission was avoided are estimated, and when it is estimated in the estimation that subcarriers where transmission was avoided are present, despreading and demodulation are carried out without using the subcarriers where transmission was avoided.
摘要:
According to one embodiment, a pickup head includes a plurality of light sources, a first objective lens, second objective lens, a driving unit, a first control unit, a second control unit, light receiving units. The first objective lens focuses a first light beam at a first recording layer. The second objective lens focuses a second light beam at a second recording layer. The driving unit moves the first objective lens and the second objective lens in a first direction and a second direction. The first control unit corrects displacement from target track along the first direction. The second control unit controls a moving direction of a position of the second light spot in the second direction.
摘要:
The method includes a step of forming a mask having an opening, for forming an opening in multiple insulating films, above a semiconductor substrate on which a member becoming a first insulating film, a member becoming a second insulating film being different from the member becoming the first insulating film, a member becoming a third insulating film, and a member becoming a fourth insulating film being different from the member becoming the third insulating film are stacked in this order; a first step of continuously removing the member becoming the fourth insulating film and the member becoming the third insulating film at a portion corresponding to the opening of the mask; and a second step of removing the member becoming the second insulating film, after the first step, at a portion corresponding to the opening of the mask.
摘要:
A sensor apparatus includes a semiconductor sensor device including a first attachment surface, a base part being wire-bonded to the semiconductor sensor device and including a second attachment surface, and a spacer being interposed between the first and second attachment surfaces and having a target attachment surface to which at least one of the first and second attachment surfaces is adhered via a die-bond resin. A total area of the target attachment surface is smaller than a total area of the first attachment surface.
摘要:
According to one embodiment, an information reproduction apparatus includes an information acquisition unit, an error detection unit, and a control unit. The information acquisition unit is configured to irradiate a reference beam, convert the reference beam into a luminance signal, and output the luminance signal when reproducing an information recording Medium. The error detection unit is configured to detect at least one selected from a first error and a second error by extracting a feature extraction quantity from the luminance signal. The first error is of an irradiation angle of the reference beam. The second error is of at least one selected from a temperature and a wavelength of the reference beam. The control unit is configured to control at least one selected from the irradiation angle and the at least one selected from the reproduction temperature and the wavelength of the reference beam using the second error.
摘要:
According to one embodiment, an optical recording head device includes a light source which outputs such a relaxation oscillation optical pulse that a full width at half maximum of a single pulse is 820 ps or less, a driving unit for driving the light source, an objective lens which converges emission light from the light source on a recording layer of a recording medium, and captures reflective light which is reflected by the recording layer of the recording medium, a distribution unit, placed between the light source and the objective lens, for distributing incident light, and a photodetection unit for receiving via the distribution unit the reflective light which is reflected by the recording layer of the recording medium, wherein a resonator length of the light source is 6560 μm or less.
摘要:
Multi-carrier transmission is performed without inserting a repetitive signal into guard interval periods. A transmitter provides guard interval periods by using a null signal to save transmission power and prevent the deterioration of the SN ratio. Delayed waves at the head of each received symbol cause high-frequency waves to occur and carriers to interfere with one another. Accordingly, a receiver adds a component following each received symbol to a delayed-wave component at the head of the received symbol. As a result, the delayed-wave component at the head of the received symbol and the added component become continuous in wave form and subcarriers do not interfere with each other.
摘要:
According to one embodiment, to solve a new problem which has been produced due to adoption of a recording method using relaxation oscillation, the laser output control device suppresses unnecessary relaxation oscillation while increasing an averaged light quantity between recording pulses to obtain reflected light quantity which is necessary for tracking and focus controlling. A laser modulation control circuit includes a recording pulse output unit which outputs recording pulses for making relaxation oscillation as the recording pulses, a bias current output unit which outputs a constant bias current between the recording pulses, and a high-frequency overlap unit which overlaps the high-frequency signal on the constant bias current between the recording pulses, and controls so as to have times at which current values at a start edge and an end edge of the high-frequency signal are almost consistent with a value of the constant bias current.
摘要:
An automatic gain control circuit able to perform high speed and correct level acquisition, able to prevent occurrence of error, and able to prevent a crash of the system. An amplification gain controller outputs a gain control signal to an automatic gain control amplifier to amplify the received signal with maximum value when receiving a burst detection trigger signal. A second gain control signal based on the detected reception signal power is calculated when receiving a first burst synchronization detection signal; and this second gain control signal is output to the automatic gain control amplifier. A received digital signal is amplified with the second gain and integrated to find the reception signal power, from which a third gain control signal is calculated and outputted to the automatic gain control amplifier to amplify the received signal with this third gain.