公开(公告)号：JPS5528581A

公开(公告)日：1980-02-29

申请号：JP10205178

申请日：1978-08-22

Applicant: SONY CORP

Inventor： YAMADA TOSHIROU ,  HAYAKAWA KIYONORI

IPC: G11B5/02 ,  G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To increase both the picture quality and the sound quality for the reproducing device by securing a square form for the signal magnetic field distribution on the magnetic recording medium. CONSTITUTION:The information signal to be recorded is supplied to signal input terminal 10 and then supplied to modulator 11 such as the frequency modulator or the like. The square wave signal of the output side of modulator 11 is supplied to rectangular wave converter 12 consisting of the integrating circuit to be changed into the rectangular wave, and this output signal is supplied to nonlinearity compensation circuit 13 to secure recording at the saturation magnetizing region to obtain a sufficient signal magnetic field. The signal magnetic field obtained at the output side of circuit 13 is supplied to recording head 18 via recording amplifier 16 and bias trapping circuit 17. And the bias signal obtained at the output side of bias oscillator 19 is supplied to head 8 via bias adjuster 20, and then the bias signal is piled on the recording signal. The signal magnetic field thus obtained features a square magnetic field distribution, and as a result the using signal wavelength band can be increased to enhance both the picture quality and the sound quality.

公开(公告)号：JPS5525811A

公开(公告)日：1980-02-23

申请号：JP9649178

申请日：1978-08-08

Applicant: SONY CORP

Inventor： HIMURO MASAMI ,  YAMADA TOSHIROU

IPC: G11B5/02 ,  G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To improve the disturbance of the signal magnetic domain for the magnetic regenerated signal using the photomagnetic effect by recording the signals after applying the specific DC magnetic field vertically to the magnetic recording medium. CONSTITUTION:Magnetic tape 1 receives the vertical DC magnetic field of more than the anti-magnetism force Hc of the magnetic powder of the tape itself. Soft magnetic film surface vertical easy-to-magnetize film device 2 is installed at the position touching tape 1 running in the direction of the arrow markings. Thus the light generated from light source generator 3 is condensed on the magnetized film of device 2 via polarizer 4, beam splitter 5 and object lens 6 each and then reflected by the reflecting film to be supplied to light detector 7 via lens 6 and splitter 5. During this, the light receives the right or left Faraday optical rotation in accordance to the magnetizing direction of the domain of the magnetized film. As a result, the light modulated signal received the width modulation according to the domain width is supplied to photoelectric converter 8, and the electric signal obtained at the output terminal 9 of element 8 is regenerated through the FM regenerator.

公开(公告)号：JPS52135788A

公开(公告)日：1977-11-14

申请号：JP5266976

申请日：1976-05-07

Applicant: SONY CORP

Inventor： ISHIKAWA REIJI ,  SETO NOBUYOSHI ,  KOJIMA CHIAKI ,  KODERA YOUICHI ,  YAMADA TOSHIROU ,  TAMURA HIDEO ,  MORI TOSHIO ,  ASO KOUICHI ,  MAKINO YOSHIMI

IPC: G01N21/90 ,  G01N33/00

Abstract: PURPOSE:To provide a method for detecting impurities or contaminants adhered on vessels for cosmetics or foods, glasses or ceramics for electric materials with good precision by having a specific substance adsorbed on impurities to be remained and irradiating excited light to effect luminescence of said substance.

公开(公告)号：JPS51118096A

公开(公告)日：1976-10-16

申请号：JP4307575

申请日：1975-04-09

Applicant: SONY CORP

Inventor： TANAKA RIICHI ,  SHIMIZU MASAHIKO ,  ITOU TAKEO ,  NAGAI TOORU ,  YAMADA TOSHIROU

IPC: C04B35/26 ,  G11B5/133 ,  G11B5/255 ,  H01F1/34

Abstract: PURPOSE:Ferrite for magnetic head in which contained oxygen is more than chemical or logical quantity and so abrasionproof and break resistance are improved.