Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Jun Kikuchi

Takeharu Yamamoto

Kenji Fujiune

Katsuya Watanabe

Yuu Okada

Takashi Kishimoto

Yoshihiro Kanda

Noriharu Kobayashi

Yasumasa Isshiki

Mutsuhiko Takeda

Fumihiro Itoh

In management device () for managing power storage device () in which a plurality of power storage blocks (Bto B) in which a plurality of series circuits of fuses and power storage cells is connected in parallel is connected in series, equalization controllerperforms, when a voltage difference among the power storage blocks exceeds a set voltage difference, a control for equalizing power storage blocks (Bto B). Fuse blowout determination unitdetermines, based on a frequency of equalization performed by equalization controller, whether one of the fuses is blown.

Management device and power storage system

A battery block for use in a power source system including battery blocks is provided with: a secondary battery; a communication circuit which outputs voltage information outside, the voltage information relating to a terminal voltage Vt of the secondary battery; a communication circuit which acquires the voltage information output from another battery block as other voltage information; and a discharge controller which discharges the secondary battery in a host battery block when a host voltage, which is the terminal voltage Vt of the secondary battery in the host battery block, is higher than a terminal voltage indicated by the other voltage information.

Battery block, and power source system

A disk motor which rotationally drives an optical disk; a rotational phase detector which detects a rotational phase thereof; an optical head having a collecting lens which collects an optical bean; a light detector and an LE signal generator which detect a position of the collecting lens in the optical head as a position signal; an LE signal memory recorder and an LE signal memory which store, in synchronization with a rotational phase to be detected by the rotational phase detector, the positional signal from the LE signal generator; an LE signal memory regenerator which outputs as a correction signal, in synchronization with a rotational phase to be detected, the positional signal which has already been detected; a subtractor; an LE signal filter, a drive circuit and a Tk actuator which move the collecting lens using a signal from the subtractor; and a low pass filter which reduces a high-frequency component of the correction signal are provided.

Optical disk apparatus, control method of optical disk apparatus, and integrated circuit

Before initiation of tracking control, an optical disk device performs an offset amount obtaining operation, in which a difference between a middle value of the amplitude of a tracking error signal and a predetermined reference value is obtained as an offset amount. After the initiation of the tracking control, the optical disk device initiates an attenuation operation, in which an offset amount attenuation section attenuates the offset amount obtained by the offset amount obtaining operation to obtain an attenuated offset amount, while initiating, with an initial value being 0, an estimation operation, in which an observer estimates the offset amount according to a tracking driving signal to obtain an estimated offset amount. The optical disk device corrects the tracking error signal by using the attenuated offset amount obtained by the attenuation operation and the estimated offset amount obtained by the estimation operation.

Integrated circuit, optical disk device, and signal processing method

An optical disc apparatus includes: a converging section for converging a light beam and irradiating a rotating information medium with the converged light beam; a moving section for moving the converging section, thereby moving a converging point of the converged light beam in a direction perpendicular to an information surface of the information medium; a converging state detection section for generating a focus servo signal which represents a converging state of the light beam on the information medium based on reflected light or transmitted light of the light beam from the information medium; a focus servo control section for controlling the moving section based on the focus servo signal, so that the light beam reaches a predetermined converging state on the information medium; and a focus pull-in section for turning ON the control by the focus servo control section, wherein the focus pull-in section turns ON the control by the focus servo control section in a case where the focus pull-in section determines that the converging point of the light beam is located in the vicinity of the minimum velocity position on the information medium axial deviation.

Optical disc apparatus

An optical disc drive includes: an optical head with an actuator and a photodetector; a tracking driver outputting a drive signal to the actuator; a first tracking error signal generator for generating a first tracking error signal based on an output signal of the photodetector; first and second lens position control sections for respectively outputting first and second lens position control signals to the tracking driver; and a selector for selectively supplying the first tracking error signal to the first or second lens position control section according to a moving velocity of the optical head during a seek operation. The first lens position control signal is obtained by extracting signal components, of which the frequencies are equal to or lower than a predetermined frequency, from the first tracking error signal. The second lens position control signal is obtained by extracting DC components of the first tracking error signal at on-track points thereof.

Optical disc drive and optical disc controller

The present invention provides an optical disk device that reduces a track lead-in time associated with a seek time. A switching means includes a multiplier A for multiplying an output of a speed control means by &agr; and a multiplier B for multiplying an output of a position control means by (1&minus;&agr;), and an adder for adding an output of the multiplier A and an output of the multiplier B to output a result of the addition as control input to an actuator driving means . At the time of movement of an optical pickup toward a target track, the multiplier factor &agr; for the multipliers A and B is set at 0, thereby performing control of the actuator driving means by means of the position control means . After the optical pickup reaches the vicinity of the target track, the multiplier factor &agr; is set to be gradually increased from 0 to 1 at a predetermined ratio, whereby the speed control means is gradually made operate to make the lens follow the eccentricity of the optical disk

Growing community of inventors

Osaka, Japan

Jun Kikuchi