-
公开(公告)号：JPH07296315A
公开(公告)日：1995-11-10
申请号：JP8474194
申请日：1994-04-22
Applicant: SONY CORP
Inventor： YAMASHITA KEITARO , SHIRAI TOSHIO , KUBODERA HISAMITSU
Abstract: PURPOSE:To provide a bias magnetic field generating head with which necessary bias magnetic field frequency and bias magnetic field intensity can be obtained easily. CONSTITUTION:Ferrite is employed as the material of cores 9 and 10. Metal magnetic elements 21 and 22 having high saturation flux densities and high permeabilities are attached to the end surfaces of the poles 12 and 13 of the cores 9 and 10. Metal magnetic material such as soft iron, silicon steel, permalloy, Sendust or amorphous steel is applied to the end surfaces of the poles 12 and 13 by adhesion, sputtering, etc., and subjected to a heat treatment to form the metal magnetic elements 21 and 22. As ferrite which has the excellent frequency characteristics are employed as the material of the cores 9 and 10, a necessary bias magnetic field frequency can be obtained easily. Further, as the metal magnetic elements 21 and 22 are attached to the end surfaces of the poles 12 and 13, the flux saturation in the pole end surface where the flux density is large can be suppressed and a necessary bias magnetic field intensity can be obtained easily.
-
公开(公告)号：JPH06139614A
公开(公告)日：1994-05-20
申请号：JP31144692
申请日：1992-10-27
Applicant: SONY CORP
Inventor： YAMASHITA KEITARO
IPC: G02B27/58 , G11B7/135 , G11B11/10 , G11B11/105
Abstract: PURPOSE:To obtain light beam spots smaller and larger in diameter from one optical head. CONSTITUTION:A parallel plane plate 31 whose cross section has a triangular recessed part 44 and a parallel plane plate 32 whose cross section has a triangular projected part 54 are arranged opposing to each other and the parallel plane plate 31 is made to separate from the parallel plane plate 32 by a prescribed distance apart by driving an electromechanical converter element 82 when a super-high resolution beam is realized. When the realization of the super-high resolution beam is not required, the parallel plane plate 31 is joined to the parallel plane plate 32 by driving the electro-mechanical converter element 82.
-
公开(公告)号：JPH04302294A
公开(公告)日：1992-10-26
申请号：JP8940091
申请日：1991-03-29
Applicant: SONY CORP
Inventor： TAKAHASHI TAKAO , ISHIMARU HIROYOSHI , YAMASHITA KEITARO
Abstract: PURPOSE:To obtain a VTR which can execute an optimum waveform correction processing based on a reproduced reference signal even in the case of reproduction after dubbing as well. CONSTITUTION:TDM digital signals reproduced from the reproducing side VTR by an output connector part 48 are extracted, connected to an input connector part 19 of the input side VTR and supplied through terminals T2 of selector parts 18a and 18b to a synchronizing signal addition processing part 20. Those signals are supplied to heads 33a and 33b after executing D/A conversion and FM modulation or the like, dubbing recording can be executed to a magnetic tape 34, and it is not necessary to generate base band video signals and to transmit them between equipments. Thus, since dubbing is executed in this way, dubbing signals are not passed through a TDM decoder 44 of a reproducing system, D/A converters 45Y, 45B and 45R, LPF 46Y, 46B and 46R, LPF 12, 15B and 15R of a recording system, A/D converters 13, 16B and 16R circuit such as a TDM encoder 17, etc., other additional operational amplifiers and various filters, and the picture quality degradation of the clubbing signals is almost eliminated.
-
公开(公告)号：JPH04254913A
公开(公告)日：1992-09-10
申请号：JP3678391
申请日：1991-02-05
Applicant: SONY CORP
Inventor： YAMASHITA KEITARO , SAITO TAKEHIKO
Abstract: PURPOSE:To prevent an impact error which occurs when an erasing head approaches or leaves a tape wound around a rotary drum from adversely affecting image quality. CONSTITUTION:A pair of recording/reproducing heads 71 and 72 are provided on a rotary drum 70 at an interval of 180 deg., and a pair of erasing head 73 is provided on the rotary drum 70 at an interval of 180 deg.. A magnetic tape is wound around the rotary drum 70 by the amount of 180 deg. and some, and the recording or reproducing of a video signal and an audio signal is performed in time division within a winding angle of 180 deg.. The heads 71 and 72 and the erasing head 73 are arranged so that the erasing head can approach or leave inside a tape lap while the heads 71 and 72 scan outside a video area on a tape 18.
-
公开(公告)号：JPH04254912A
公开(公告)日：1992-09-10
申请号：JP3678291
申请日：1991-02-05
Applicant: SONY CORP
Inventor： YAMASHITA KEITARO , SAITO TAKEHIKO
Abstract: PURPOSE:To prevent erasing current to be made to flow to a rotational erasing head at the time of audio after-recording of the VTR from disturbing the recording/reproducing a video. CONSTITUTION:A tape 18 is wound around a rotary drum 70 provided with recording/reproducing heads 71 and 72 and erasing heads 73A and 73B, and the recording of a video signal and audio signals on several channels is performed to one track in time division within a winding angle of 18 deg.. The recording/reproducing heads 71 and 72 and the erasing heads 73A and 73B are arranged so that the recording/reproducing heads 71 and 72 can scan outside a video area while the erasing heads erase one channel of audio area out of the several channels.
-
Patent Agency Ranking
公开(公告)号：JPH04245063A
公开(公告)日：1992-09-01
申请号：JP3164291
申请日：1991-01-31
Applicant: SONY CORP
Inventor： YAMASHITA KEITARO , KONO MASATOSHI
Abstract: PURPOSE:To surely inhibit copying of video signals upon which a spurious signal, which is superimposed upon the video signals in an interleave relation, is superimposed by inhibiting recording operations when the spurious signal is detected at the time of reproducing the video signals. CONSTITUTION:In the recording system 2 of a VTR 1, analog luminance signals Y and color difference signals PR and PB from a decoder, another VTR, etc., are supplied to the VTR 1. The color difference signals PR and PB are respectively supplied to a recording signal process circuit 6 through terminals 3 and 4 and the luminance signals Y are supplied to the circuit 6 and a detection circuit 7 through a terminal 5. The detection circuit 7 detects whether or not a spurious signal SSP which is used as a copy inhibit signal is superimposed upon the signals Y in an interleave relation and, when the spurious signal SSP is detected, supplies, for example, a high-level signal to a controller 8 as a detect signal. As a result, a control signal Sc which inhibits the recording operations of the processing circuit 6 is supplied to the circuit 6.
-
公开(公告)号：JPH04219664A
公开(公告)日：1992-08-10
申请号：JP41153590
申请日：1990-12-18
Applicant: SONY CORP
Inventor： SAITO TAKEHIKO , SHINDO NORIO , YAMASHITA KEITARO
IPC: G11B15/61
Abstract: PURPOSE:To uniformize the thickness of the air film of a tape, which travels on the traveling surfaces of a rotating drum and a fixed drum, extending over a whole circumference from the entrance part to the exit part of a tape winding position in a tape recorder or the like provided with the rotating drum and the fixed drum. CONSTITUTION:A spiral-like groove 4 is formed on either of the faced surfaces of the rotating drum 2 and the fixed drum 1. Then, the width of a groove 7 formed in the circumferential direction of the drum 2 is made wide. Besides, a plane surface 11 whose width is changed is formed on the outside circumferential part of the faced surface to the surface where the spiral-like groove 4 is formed.
-
公开(公告)号：JPH04211596A
公开(公告)日：1992-08-03
申请号：JP5967391
申请日：1991-03-01
Applicant: SONY CORP
Inventor： NISHIMURA AKIRA , NISHIKATA YUTAKA , TAUCHI YOICHIRO , YAMASHITA KEITARO
Abstract: PURPOSE:To satisfactorily record and reproduce HDTV signals by distributing the time divided multiplexed signals of brightness signals and chroma signals to two channels and defining the chroma signals of each of the respective channels to one. CONSTITUTION:Line memories 6r, 6b extract the 1st and 2nd chroma signals alternately in one horizontal period each from the video signals consisting of the brightness signals and the 1st and 2nd chroma signals and subject the extracted chroma signal to time base compression. The brightness signals are subjected to time base expansion in line memories 3A, 3B. Adders 10A, 10B time divided multiplex the brightness signals subjected to the time base expansion and the chroma signals. The time divided multiplexed signals are distributed to the two channels in such a manner that the kinds of the chroma signals of the respective channels are made single in a frame memory 11. The distributed signals are sequentially recorded with two times of scanning for one field by two channel heads 17A, 17B having the azimuth angles varying from each other by each of the two channels.
-
公开(公告)号：JPH04170293A
公开(公告)日：1992-06-17
申请号：JP29793590
申请日：1990-11-02
Applicant: SONY CORP
Inventor： NISHIKATA YUTAKA , YAMASHITA KEITARO
Abstract: PURPOSE:To improve the stability of signal reproduction by integrating an identification signal and a burst signal so as to reduce an identification signal area. CONSTITUTION:A burst signal BURST being a pulse of a maximum width is generated from a signal generation ROM 153 and a pulse with a width in response to the identification state such as color discrimination and segment discrimination, that is, a burst signal ID-BURST subjected to ID control is outputted by an ID control signal IDC. Thus, the ID control signal IDC is fed to a control circuit 152, from which a window signal WINDR1 subjected to timing adjustment with the burst signal BURST is outputted, and a window signal is given to a gate circuit 154, which gates the burst signal BURST from the signal generation ROM 153 to decide the output pulse number of the burst signal BURST.
-
公开(公告)号：JPH0427286A
公开(公告)日：1992-01-30
申请号：JP13204990
申请日：1990-05-22
Applicant: SONY CORP
Inventor： YAMASHITA KEITARO , SAITO TAKEHIKO
Abstract: PURPOSE:To always execute satisfactory recording even if the diameter of a rotary drum by using one piece of rotary head in which a pair of magnetic gaps whose azimuth angles are different are formed by one body, and changing a time base of a signal in accordance with the rotating speed of the head and the winding angle of a magnetic tape. CONSTITUTION:In a rotary drum 70, a magnetic head device 71 in which a pair of magnetic gaps whose azimuth angles are different are formed is provided by only one piece. This drum 70 is rotated at a speed of natural number folds of a field frequency. In accordance with a rotating speed of this drum 70 and such a winding angle as winding length to the drum 70 of a magnetic tape 18 becomes constant, a time base of a signal distributed to plural channels is changed, and even if the drum diameter is changed arbitrarily, satisfactory recording is always executed. As a result, the VTR can be miniaturized by changing the rotary drum diameter by a simple configuration.
-
-
-
-
-
-
-
-
-
Search Results
141
records
(took 0.028 seconds)
