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41. 发明专利

JPH03276413A MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH03276413A
公开(公告)日：1991-12-06
申请号：JP7757590
申请日：1990-03-27
申请人： MITSUBISHI ELECTRIC CORP
发明人： KANEKAWA HIROSHI , NAGASAWA MASAHITO , YOKOYAMA EIJI , NAKATSU KIMIHIDE , MIYANOCHI TOSHIHARU
IPC分类号： G11B5/588
摘要： PURPOSE:To prevent overlap of recording tracks by performing the feedback control of an actuator abased on information of the magnetic field detected by each magnetic head so that the difference between respective heads is a prescribed extent. CONSTITUTION:A mobile head 16 detects magnetic fields Bf1 and Bf2 generated by AC magnetic field generating coils 45 and 45a to output a detection signal each time when passing the vicinity of an AC magnetic field generator 40. A BPF 42 allows a signal component S having a frequency F1 to pass through, and a BPF 43 allows a signal component T having a frequency f2 to pass through. A subtractor 44 operates the difference between two components S and T and feeds back this difference component to an actuator 7, and the mobile head 16 is moved in such direction that this difference is zero. Thus, the mobile head is positioned to a prescribed position independently of the hysteresis, the temperature characteristic, the secular change, or the like of the actuator 17.

42. 发明专利

JPH0281311A ROTARY HEAD ASSEMBLY OF MAGNETIC RECORDING AND REPRODUCING DEVICE 失效
公开(公告)号：JPH0281311A
公开(公告)日：1990-03-22
申请号：JP23291788
申请日：1988-09-17
申请人： MITSUBISHI ELECTRIC CORP
发明人： KANEKAWA HIROSHI
IPC分类号： G11B5/53
摘要： PURPOSE:To decrease the wear and damage of a magnetic tape and the unequal rotating load and rotation of a rotary cylinder by floating the magnetic tape by the air introduced by the grooves provided on the outer peripheral surface of the rotary cylinder. CONSTITUTION:The grooves 12 for air introduction which are juxtaposed in plural pieces on the outer peripheral surface 10 of the rotary cylinder 3 diagonally cross circumrotating grooves 10 from near the top end of the rotary cylinder 3, pass diagonally between a window 302 and the circumrotating grooves 10 and extend backward of the window 302. The front ends 12a thereof are formed to a V shape. Since the air is thereby introduced along the grooves 12 to the spacing between the window 302 and the grooves 10 and to the rear of the window 302, air films 11 between the window 302 and the grooves 10 and the rear of the window 302 are increased in thickness and the magnetic tape 1 is floated. The magnetic tape 1, does not, therefore, come into contact any more with the outer peripheral surface 301 of the rotary cylinder 3 between the window 302 and the grooves 10 and in the rear of the window 302. The wear and damage of the magnetic tape 1 generated by the contact and the unequal rotation of the rotary cylinder 3 are prevented in this way.

43. 发明专利

JPS6476444A PROGRAM TIMER DEVICE 失效
公开(公告)号：JPS6476444A
公开(公告)日：1989-03-22
申请号：JP23531487
申请日：1987-09-17
申请人： MITSUBISHI ELECTRIC CORP
发明人： OGURA MASANORI , KANEKAWA HIROSHI
IPC分类号： G11B15/02 , G11B15/03 , G11B27/02 , H04N5/76
摘要： PURPOSE:To record reserved programs on a magnetic tape in a desired editing order by adding data, which fast forwards/rewinds the magnetic tape by a prescribed extent at each time of the recording operation of a reserved program, to reservation data. CONSTITUTION:When broadcast programs having reservation numbers 5, 1, 2, 3, and 4 will be recorded on the magnetic tape in the editing order of reservation numbers 2, 3, 5, 4, and 1, a memory control circuit 2 outputs a recording start signal and a signal indicating a channel number to a CPU 11 at the recording start time in the recording day of the reservation number 5 and a clock generating circuit 4 counts the recording time to record the program in a memory 3 on a VTR 16. The magnetic tape is fast forwarded by an extent corresponding to the recording time of the reservation number 4 and is stopped at the recording start point of the reservation number 1. Recording operations of reservation numbers 1, 2, 3, and 4 and the magnetic forwarding operation are executed similarly, thus obtaining the magnetic tape on which respective programs are edited.

44. 发明专利

JPS6430918A THRUST BEARING 失效
公开(公告)号：JPS6430918A
公开(公告)日：1989-02-01
申请号：JP18593887
申请日：1987-07-24
申请人： MITSUBISHI ELECTRIC CORP
发明人： HONDA KATSUHIKO , KANEKAWA HIROSHI
IPC分类号： F16C17/04
摘要： PURPOSE:To stably obtain the performance of a bearing with small wearing and to improve the rigidity of a shaft by forming a spiral groove, surface symmetry with a bearing surface, in the opposite bearing surface. CONSTITUTION:A thrust bearing 1 forms a spiral groove 3 on a bearing surface 2 while a spiral groove 5, surface symmetry with the groove 3, on an opposite bearing surface 4. Accordingly, the bearing 1 stably obtains its performance with small wearing and enables the rigidity of a shaft to be improved because coining work can be simultaneously applied to both surfaces of a material of the bearing.

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