Matsushita Electric Industrial Co., Ltd.

Hitachi Maxell, Limited

Fuji Sangyo Co., Ltd.

Kyoto Institute of Powder Technology, Limited

Hiroshi Sakamoto

Noriyuki Manabe

Yoshiyuki Iwamura

Fumio Sumi

Takeshi Matsuura

Yoshiro Funakoshi

Kenichi Kasuya

Shinjyo Higashino

Takeshi Takashima

Hirotaka Kawamura

Katsuhiro Inoue

Yoshiyuki Asaba

The optical disk controller of this invention that reduces the frequency of output of status reports to relieve the burden of a system controller includes: a status generator for generating status reports each representing the operation state of the optical disk controller every sector of a disk; and a status sampling section for sampling the status reports at a set sampling interval. When a generated status report matches with 'sampling abort' status stored in a sampling category storing portion, status sampling is aborted.

Optical disk controller which sets sampling interval according to rotational speed of optical disk

In modifying a program fixedly recorded in a ROM or the like, desired positions in the program can be modified with a little hardware. In order to achieve the object, the program modification device comprises the modifying address register which stores the addresses of program data to be modified prior to the execution of the data and the modifying address storage table which stores all the addresses of the modification source programs to be loaded to the modifying address register and all the addresses of the modification target programs in pairs, and further comprises a modification target program having instructions embedded therein so as to load necessary information from the modifying address storage table to the modifying address register before the program to be modified is executed.

Program modification device

The demodulated signal from the optical disk, containing a plurality of addresses is supplied to the address decoder which sets error detection flags when address decoding fails. If all addresses fail to decode, an address interpolator performs address interpolation up to a stored maximum number of iterations, thereby allowing data to be continuously read out from the demodulated signal. The maximum number is stored in memory. If at least one address is decoded, the address interpolator selectively updates the stored maximum number to achieve higher performance in reproducing data items from the optical disk.

Method and apparatus for performing address interpolation on optical disk

A magnetic recording tape comprising a nonmagnetic substrate and a magnetic layer which is formed on at least one surface of the substrate, the magnetic layer comprising a magnetic powder and a binder resin having a surface resistivity of not larger than 1.times.10.sup.9 .OMEGA./sq. cm and a thickness of not larger than 3.5 .mu.m, the magnetic recording tape having a light transmittance of not larger than 0.8% and a residual magnetic flux density of at least 1400 G, which has good light shielding, and reproduction output characteristics, a small number of dropouts and improved touch with a magnetic head.

Magnetic recording tape

A powder processing apparatus of the fluidized bed type wherein air is blown into a cylindrical container through its bottom to perform various treatments while keeping powder in the container in fluidized condition. Air fed in through an opening in the bottom surface of the container is introduced into a rotating hollow frusto-conical body and is allowed to blow out in the centrifugal direction from an air diffusion clearance defined between the skirt end of the frusto-concial body and the bottom surface of the container, thereby forming a fluidized bed of powder. The portion of the bottom surface around the opening rises and/or a member made of air-permeable material is installed in the opening in the bottom surface to prevent passage of powder; this arrangement, coupled with the air current blowing out of the air diffusion clearance, prevents entry and hence flow-out of powder.

Powder processing apparatus

Growing community of inventors

Osaka, Japan

Hiroshi Sakamoto