Sanyo Electric Co., Ltd.

Zojirushi Corporation

Tadashi Okajima

Shigekazu Minechika

Takanobu Hisamitsu

Kazuhiko Sugimoto

Kazuhiro Tsujino

Kenji Asano

Koichi Tada

Toshihide Hamaguchi

Hideaki Yano

Keiji Nagata

Yuzuru Goto

Takuma Tokuoka

Yoshihiro Aoi

Ichizo Sakamoto

Yoichi Sakaguchi

Takumi Kura

Sadamu Utsunomiya

Inner pot for electric rice cooker

Electric pot

A disc apparatus () includes an optical lens (). A laser beam is irradiated onto a recording surface of the magneto-optical disc () through the optical lens (), and a TE signal or an RF signal is detected on the basis of the laser beam reflected by the recording surface. Herein, an MPU () replaces the optical lens () in an optical axis direction, and a TE signal detection circuit () or an RF signal detection circuit () detects the TE signal or the RF signal at each of lens positions. A laser power is adjusted by the MPU () such that amplitude of each of the TE signal or the RF signal detected is below a saturation value. When a parameter is adjusted, a position of the optical lens () is controlled such that the amplitude of the TE signal or the RF signal detected thereafter is maximized.

Disc apparatus for reproducing a signal on a disc using a laser beam

A disk apparatus () includes an optical lens (). A seek operation is performed by moving the optical lens in a radius direction of a recording surface of a magnetooptical disk (). When the seek operation is being operated, a TE signal detection circuit () generates a TE signal based on a laser beam reflected from the recording surface, and applies a generated TE signal to a DSP () via an A/D converter (). The DSP detects a peak level of the TE signal and a level change amount of the TE signal in a unit time, and generates a tracking actuator control voltage based on the detected peak level and the level change amount. A moving speed of the optical lens is controlled by a generated tracking actuator control voltage.

Disk apparatus for projecting a laser beam onto a recording surface of a disk recording medium

In a case of recording data into an optical disk (), a disk apparatus () rotates the optical disk () by a ZCLV system, and in a case of reading out the data from the optical disk, the disk apparatus rotates the optical disk by a ZCAV system. By rotating the optical disk by the ZCLV system, a DSP () performs a read of a modified read carried out before recording, and a read of a verification carried out after the recording, and thereby, no occurrence of a change of a rotating speed of the optical disk among the modified read, the recording, and the verification.

Disk apparatus

A disk apparatus () includes an optical pick-up () and a DSP (), and irradiates a laser beam onto a recording surface of a disk recording medium () by the optical pick-up. In a case that a time period (access time period) required for a seek is shorter than a time period (changing time period) required for the number of rotations, the DSP does not simultaneously perform a change of the number of rotations and the seek. To the contrary, the DSP delays the seek by |access time period&#x2212;changing time period|, and performs a recording and a reproduction after the change of the number of rotation is ended.

Disc apparatus

A disk apparatus includes a DSP core. If given an instruction to skip music during reproducing with an MO disk, the DSP core sets to a counter a count value corresponding to the number of tracks to jump over. Then, tracking servo is turned off and an optical pickup is moved in a radial direction of the MO disk. The DSP core detects rising and trailing edges in a TZC signal and counts down the counter. When the count value becomes 1, a level of the TZC signal is determined to judge whether there is variation in offset value or not. If there is variation in offset value, edges are considered counted incorrect. Accordingly, the count value is incremented. Thus, jump can be made to a desired land or groove, i.e. access can be made positively to a target position.

Based on a video signal from a CCD ( ), an exposure evaluation value producing circuit ( ) produces an exposure evaluation value for automatic exposure, a focus evaluation value producing circuit ( ) produces a focus evaluation value for autofocus, a prescribed value is set as a threshold value if the aperture area of an iris detected by a diaphragm amount detecting circuit ( ) is equal to or higher than a prescribed value, and a threshold value is set according to the aperture area of the iris if the area is equal to or smaller than the prescribed value. If a luminance signal is larger than the reference value, integration of the high frequency component of a region having a luminance level equal to or higher than the threshold value is excluded.

Automatic focusing device

The present invention is aimed to provide an autofocus device and a correction method of correcting a zoom tracking curve for an intermediate subject distance without increase in storage capacity. A plurality of zoom tracking curves L1(Z) and L2(Z) corresponding to a plurality of different subject distance and correction data &agr;(Z) calculated in advance are stored in a memory . A control circuit carries out a predetermined interpolation process using the stored plurality of zoom tracking curves and correction data to calculate a zoom tracking curve L(Z) corrected with respect to a subject distance differing from the plurality of subject distance. Tracking control of focus is carried out according to this calculated zoom tracking curve.

Automatic focusing device of image pickup device and method of correcting zoom tracking curve

A disk apparatus includes a DSP core, and executes processing for focal point positioning when turning on the power to the apparatus main body or exchanging the MO disk. The DSP core detects maximum and minimum values of outputs (focus error signal) of an FE signal detector circuit while moving the objective lens from an uppermost position of not contacted with a disk surface to a lowermost position. The DSP core calculates a middle position using positions of the objective lens upon fetching maximum and minimum values (uppermost and lowermost positions). Subsequently, the DSP core determines a range narrower than a range to be determined by the uppermost and lowermost positions, by the use of the middle point and amount of surface deflection of the MO disk. Then, the DSP core wobbles the objective lens within the narrow range and detects a focal point based on a level of the focus error signal.

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Osaka, Japan

Tadashi Okajima