Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1993-10-12
1995-06-13
Epps, Georgia Y.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4435, 369 4437, 369 4429, 369 53, 369 54, 369120, G11B 713
Patent
active
054250110
ABSTRACT:
In response to a test signal received at a test terminal, one terminal of a first computation circuit and three terminals of a second computation circuit are each provided with a reference voltage, or a ground potential, which is available at reference voltage supply terminals associated with photo detectors. Another terminal of the first computation circuit and the second computation circuit are each provided with a detected voltage. If the functions of the computation circuits are not defective, function signals will be obtained each having a value which corresponds to an imbalance between the detected voltage and the reference voltage. Thus, only one test terminal is required, which reduces the size of the semiconductor integrated circuit.
REFERENCES:
patent: 5151888 (1992-09-01), Shikichi et al.
patent: 5235583 (1993-08-01), Jongenelis et al.
Patent Abstracts of Japan, vol. 12, No. 457 (E-688), Nov. 30, 1988, JP-A-63 181 372, Jul. 26, 1988.
Patent Abstracts of Japan, vol. 12, No. 217 (E-624), Jun. 21, 1988, JP-A-63 013 368, Jan. 20, 1988.
Patent Abstracts of Japan, vol. 12, No. 417 (P-782), Jul. 11, 1988, JP-A-63 153 733, Jun. 27, 1988.
Transactions of Japan Society of Mechanical Engineers, Apr. 1990, "Recent Directions in Digital Audio Storage Media", Tadao Yoshida, pp. 21-27.
Mitsubishi Denki Kabushiki Kaisha In-House Technical Bulletin, "A General Compilation of Technology in the Field of Photo-Memory and Photo-Electro-Magnetic Memory", Section Three Digital Audio Disk, pp. 2/27-19/27.
Kusano Toshiaki
Takahara Seiji
Edun Muhammad N.
Epps Georgia Y.
Kyoei Sangyo Co. Ltd.
Mitsubishi Denki & Kabushiki Kaisha
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