Funai Electric Company Ltd.

Shoji Saito

Yasunori Kuwayama

Tadashi Tachibana

When a break in data is detected by a detection unit, an audio output stoppage command unit commands a digital audio processing device connected to an audio output unit to stop output of audio. A sampling frequency checking unit checks whether or not the sampling frequency of the audio data before the break, and the sampling frequency of the audio data after the break, are the same. When the sampling frequency checking unit detects that these sampling frequencies are the same, an audio output stoppage elimination command unit waits until a fixed time period has elapsed, and then returns the reading position upon the optical disk at which the reading unit reads in data to a position directly after the break, and also commands the digital audio processing device to eliminate the stoppage of output of audio.

Optical disk device

A ball grid array is mounted on a wiring board in a rectangular shape provided with screw insertion holes and fixed with screws to a mounting member at four points. Solder banks are formed around the screw insertion holes and pressed contact with a ground connecting face on the mounting member. The screw insertion holes are located in corners of an imaginary rectangular outline imagined on a board surface of the wiring board. Two of the holes diagonally positioned on the outline are located in one of corners and at an inward position of the wiring board, while the remaining two are located at intermediate parts of two sides embracing the corner. The wiring board is divided into a rectangular first zone surrounded by the four points and an L-shape second zone. The ball grid array is mounted on an intersecting area between vertical and transverse areas defining the L-shape.

Mounting structure of ball grid array

A disc reading apparatus includes a microcomputer. The microcomputer calculates, based on amount data, an outer radius (RM) of an area that is recording data. The reading speed on the determined outer radius is set to a previously set speed (V.sub.2) for the outer circumference. When reading desired data, a radius of an inner circumference (r) of the data-recorded area is calculated from time information (identification data) to calculate a reading speed (V.sub.n) for reading the data. That is, since the disc contains data recorded such that the linear velocity per unit area becomes constant, the position of a pick-up and the reading speed are represented by a generally inversely proportional linear equation. Therefore, the reading speed (V.sub.n) can be calculated based on the inner radius (r) of the area recording the data to be read, the inner and outer radii (RS, RM) of the data-recorded area, and previously set inner and outer speeds (V.sub.1, V.sub.2).

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Daito, Japan

Shoji Saito