JPS5877006A - Recording device - Google Patents

Abstract

PURPOSE:To obtain a dividing line which is set substantially along a slant track to separate the erasion from non-erasion for both start and end terminals of erasion, by successively turning on plural erasion heads which are arrayed with inclination to the carrying direction of a belt-shaped recording medium. CONSTITUTION:The signal CLK of a clock generator CLG is divided by a frequency divider SEP, and the pulse signal SE1 is fed to the input terminal at one side of AND circuits AND1 and AND2 respectively. When an erasion-video record ON switch SW1 is turned on, the other input terminal of the AND1 is set at a high level. Thus the signal SE1 is fed to a ring counter RCSA and a delaying circuit DL1 respectively, and the output of the DL1 is fed to a ring counter RCSB. Therefore the erasing current is applied to erasion heads EH1A- EHnA and EH1B-EHnB. Then the gate of the AND2 is opened when an erasion/video record OFF switch SW2 is turned off. Thus the pulse SE1 is fed to the clock terminal CK of a reset ring counter RCRA as well as to a delaying circuit DL2. On the contrary, the above-mentioned erasion heads are successively opened.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording device for recording video signals 3 and the like on a strip-shaped recording medium, and particularly relates to a recording device equipped with a recording means that records at a predetermined angle with respect to the conveyance direction of the medium. Conventionally, in such an intermediary recording apparatus, an erasing head has been used which has a gap across the entire width of the recording tape as a strip-shaped recording medium and erases the entire recording tape at the same time. When such an erasing head is used, the oblique recording trajectory of the recorded signal is shown in FIGS. 1 and 2. In FIG. Cao-rutokuta, 110d
vocal) is a tic. Further, 12 is an erased portion, 16 is a recorded portion, and 14 is an oblique recording locus. Further, TE indicates the erase start end of the T-company, TE indicates the erase end end, and an arrow indicates the transport direction of the Ad magnetic tape. As shown in FIGS. 1 and 2, the erasure start end Ts and the end end TE intersect with the plural slanted sickle tracks (hereinafter referred to as slant l tracks).

Therefore, if you want to record a new signal, some erased stent tracks will be overlapped by new signals on the rack, or if you want to avoid overlapping, the blank space will be In the former case, line beat noise occurs and cracks occur (because the recorded signal is recorded as a frequency or phase modulated wave), while in the latter case, a signal that is intermittent for a predetermined period of time is reproduced, and at the same time there is a break in the intermittent section. No signal noise occurs.

Therefore, the signal content cannot be edited as a continuous signal without noise. In view of the above-mentioned drawbacks, the present invention has been designed to provide a continuous signal with no noise, and as shown in FIG.
The object of the present invention is to provide a sickle device in which the erasing/non-erasing division line at the end TEK is arranged approximately along the stent track.

An embodiment of the present invention will be described in detail below according to the drawings. Qli
do. FIG. 1 is a plan view of a home-use cassette playback device (hereinafter referred to as VTR).

In the figure, 21 is a cassette containing the magnetic tape 11, 22 is a take-up reel, 26 is a supply reel, and 24 to 26 are guide bins for loading, of which 24.26
is a vertical guide bin, 25°27 is an inclined guide bin, 28
is an inclined cylinder with a built-in rotating magnetic head for recording and playback, 29°60 is an impedance trailer, 61 is an audio and control signal head, 32a is a pinch rotor, 6 is
6 is a capstan, and 64 is an erasing head.

Since these operations are already well known, they will be briefly explained.

When the cassette 21 is attached, the tape 11 and the guide bins 24 to 27 are at the position indicated by the broken line, and then the guide bins 24 to 27 are moved by the operation of a loading motor (not shown).
27 is moved to the positions indicated by solid lines 24' to 27', and the tape 11 is attached to the cylinder 28. Then, when the playback or recording mode is selected, the vinyl recorder 62 moves from the position indicated by the broken line to the position indicated by the solid line 62', and the tape 1 is read.
1 in the direction shown by arrow A.

Next, the configuration and operation of the erasing head 3 related to the present invention will be explained in the fifth section.
This will be explained with reference to the circuit diagram shown in the figure and the timing chart shown in FIG. The erase head 64 consists of two multi-erase head units IcI (UA, EHUB).
KHUB is the erase head EHIB~1
Consists of cHsB. Head KHI B cane head 1c
All the heads are arranged in a staggered manner so that they are sandwiched between H1 and 1cH2. Each erasing head unit is arranged in a staggered manner in the width direction of one hellard tape using the well-known Parta method, allowing all heads of 137 units to operate and completely erasing the entire width of Rekechi 111. can do.

Next, v; regarding the circuit will be explained.

In the figure, r, TRIA-TRsA, TRIB-TRs
B) Liac, AC8 is AC power supply for erasing, LGi
A~L G' A * LGI B-LGs B Hiro 5
')? m road 1. RC8A.

RORA, RC8B, RCRB are 9>/
:h t >, J, GjLGd connection generator, 5Epa minute M unit, SWI expansion erase mode and recording jj-E
The need selection switch SW2 is a selection switch that turns off the erase mode and recording mode, ANDl, AND2
It is a DL1゜DL2Fi delay circuit.

Explain the operation.

The black ivy (3
LK is frequency-divided by a divider 5ICp and becomes a pulse signal SE.
1 is obtained and the AND circuit AND1, MND2 is 0 which is manually input to one input terminal, and the selection switch S! 1 is turned on, the other input of the AND circuit AND1 becomes high level (hereinafter referred to as ``H''), so the pulse signal 4sx1 is applied to the Lindaka Kunta RO8A and the delay circuit DLIK, and the output of the delay circuit DLi is It is input to the ring kakunta RGSB. The ring capacitor RC8A sequentially connects latch circuits LGI A and LG2 according to the input clock P1.
A, . B.

..., LGsB turns on. Therefore, the triggers are sequentially activated TR1, TRIB, TR2A, TR2B, TR3A,
ee・, TR(s-1)B.

TR5A, TR5B Can L Te, Erase IE flow from power supply AO3 #I [Next ICHIA-, ICHIB, 1
H2A, EH2B, EH3A, *-1CH(m-1)B
JHaA, EHsB K11 primary application tL. In this embodiment, assuming that each head in the erasing head unit RHUAIcH'UB is at the same position in the tape transport direction, as shown in FIG. The head of the unit EHUB is turned on at the timing of . However, if it is not possible to position the heads KHUM and EHUB P3 at the same position in the tape transport direction, or if the positions cannot be determined with mechanical precision, adjust the delay time using the variable resistor VRI. be able to.

When the erase and record mode switch S102 is turned off, the gate of the AND circuit ND2 opens and the frequency divider S
The output pulse signal SKI of the EP is input to the tarok terminal of the reset circuit RGR and the delay circuit DLIK. Output signal of switch SW2 @ Linda counter RC8A for H″ company set.

It is input as a reset signal to the RGSB terminal, and Lindakakunta RC8A' and RGSB are reset. Here, the delay time of the delay circuit DL2 is 11 as described above.
゜Similar to the delay circuit DL1, it can be adjusted using the variable resistor VR2. It is input to the output loop reset cylinder counter RCRBK of the delay circuit DL2. Therefore, the gate circuit LGIA is sequentially gated according to the pulse signal P2.

LG2, . . . , LGsA are reset. Also,
According to the pulse signal PL)2, the latch circuit LGI
B.

LG2B, ---, LGsB are reset. As a result, ``T, Tia Tsuk is TRI A, TRI B,
TR2mu, TR2B,...

Since TR5A and TR5B are turned off, the erase current is 5
Tsudo KHIA, W) IIB, KH2AJH2B,...
-, ICH%, KHsB JIK cutoff.

As described above, it becomes possible to set the erasure end line SE and erasure start line SL along the stent track as shown in FIG. 7.

As described above, in the helical scan type recording apparatus of the present invention, a plurality of erasing heads are arranged obliquely with respect to the conveyance direction of the recording medium, and the erasing heads are sequentially turned on or off.

According to the present invention, the erasure start line and the end of erasure can be determined with a simple configuration without having to have structural complexity such as moving the erasure head or moving the erasure head to the stent track IIcG diagonally. It is possible to set the line roughly along the stencil) tick. Therefore, editing such as dubbing can be performed on the tape without generating noise, which has been a problem in the past.

In this embodiment, two erasing head units are arranged in a staggered manner, but if the erasing width of one erasing head is wider than the gap interval, only one unit may be used. Although the erasing heads are arranged in a direction perpendicular to the tape transport direction, they may be tilted to some extent. Furthermore, although an AC power source is used as the erasing power source, a DC power source may also be used. In addition, it is not limited to magnetic recording or helical scan type recording.
All recording formats in which tracks run obliquely on a strip-shaped recording medium are within the scope of the present invention.

Also, regarding the number N of erasing heads, consider the number M as follows:
Let T be the time taken for the recording/playback head to scan M number of vines. In other words, when there is only one erasing head, noise will appear on the screen for a period of time T. However, if the number of erasing heads is 2 and the first erasing head is turned on and the second erasing head is turned on 2 times later,
In the same way below the stepped eraser, if N erase heads are used, the erase line has one slan in M))) When it intersects with the rack, it becomes K.
Therefore, the time at which the noise occurs becomes a ball. In other words, when M=N, it is possible to completely suppress the occurrence of noise, which is very effective in editing such as continuous shots.

As shown in the above, the larger the number N of erasing heads, the shorter the noise generation time, but even if N is 2 or more, the effect can be fully exhibited.

[Brief explanation of drawings]

1 and 2 are diagrams showing the manner of recording and erasing on a magnetic tape by a conventional erasing head, FIG. 3 is a diagram showing the manner of recording and erasing on a magnetic tape according to the present invention, and FIG. 4 is a diagram showing the manner of recording and erasing on a magnetic tape according to the present invention. FIG. 5 is a plan view of the VTR of the example, FIG. 5 is an electrical path diagram of this embodiment, FIG. 6 is a diagram showing a timing chart of the circuit of FIG. 5, and FIG. It is a figure showing an erasing mode. In the figure, 11 is a magnetic tape, EHUA, ii:
HUB is erase unit, KHIA-KHsA, g
HIB ~EHnBiji left, TRIA-TRs
A, TRIB-TRsB Hiro triac, AC8 is the AC power supply for erasing, LG1A to LG%A, LGI B-L
(, %B is a latch circuit, RC8A, RO8B set ring switch, RCRA-RGRB d reset ring switch, CLG is a tally generator, 5
ICP frequency divider, DLl, DL2 are delay circuits, VRl
, VR2 ha l'Tffim anti, S I4 erasure 1tl
a! The beginning! , SICIC unerased end. Applicant: Canon Co., Ltd. Agent: Gi Marushima
:j, 'l+': Figure 1 Figure 2

Claims (2)

[Claims] (1) In a recording device equipped with a recording means for recording a video signal or the like on a strip-shaped recording medium at a certain angle tilted with respect to the conveyance direction of the medium, a plurality of nine erasures arranged at an angle with respect to the conveyance direction are provided. 2. A recording device according to claim 1, further comprising a head, and when the eraser head is turned on, erasing of information on the recording medium is started approximately along a recording trajectory. (2) In a Kuki Kama device that includes recording means for recording video signals and the like on a strip-shaped recording medium at a predetermined angle with respect to the transport direction of the medium, a plurality of erasing heads are arranged at an angle with respect to the transport direction. 1. A recording apparatus characterized in that erasing is completed approximately along the recording locus of information on the recording medium by sequentially turning off the erasing head.