JPH03105701A - Video tape recorder - Google Patents

Abstract

PURPOSE:To realize the recording in the same format with a small diameter cylinder by using plural heads disposed at intervals of a prescribed angle on the rotary cylinder and performing the recording at a specific tape wrapping angle and cylinder revolving speed. CONSTITUTION:Plural (n) channels as one channel is denoted as two heads disposed opposite to each other on the rotary cylinder having a diameter L, and consequently 2n heads ((n)=2, 3, 4, 5...) are used while the tape wrapping angle is specified as approximately 180 deg., and cylinder revolving speed as M, whereas it is constituted that when the head R1 in use for each channel is separated from the tape, the other head L1 is started to come into contact with the tape, and in this case, during an operation for changing the using head R1 over to the other head L1, the recording is carried out at the specified tape wrapping angle and cylinder revolving speed by using plural heads R1 and L1 disposed at the prescribed angle intervals on the rotary cylinder having the specified diameter in order to be identical with the 1st recording format to be obtained at the time of recording. By this method, the recording is feasible with a small diameter cylinder, and miniaturization with light weight can be realized for constituting a cam coder.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to video tape recorders such as high-definition camera-integrated VTRs.

Conventional technologyConventional consumer camera type V that records NT80 signals
For TR (camcorders), various methods have been proposed and put into practical use to reduce the cylinder diameter. for example,
In contrast to the basic VTR shown in Figure 5▲, Figure 6B has 4 heads and 3/2 times the cylinder rotation speed, and Figure 6C has 2 heads and approximately doubled the cylinder rotation speed. It is.

However, in order to record and record high-definition television signals,
Consumer-use camera-integrated VTR that records conventional NTSC signals
With this head configuration, the recording capacity was insufficient and, of course, it was impossible to realize a camcorder. multiple n channels as one channel;
2n heads (n: 2, 3, 4.6...) are used, the tape winding angle is approximately 180, the cylinder rotational speed is set as the axis, and when the head in use is attached to each channel and leaves the tape, A predetermined diameter is formed so that the other head begins to contact the tape, and at that time, while performing an operation of switching the head in use to the other head, a predetermined diameter is formed so as to be identical to the first recording format obtained when recording. By recording at a predetermined tape winding angle and cylinder rotation speed using a plurality of heads arranged at a predetermined angle on a rotating cylinder having It is configured to generate the same format as .

As a result, the recording capacity is increased by n times compared to a conventional VTR that records NTSC signals, and by increasing the housing and cylinder rotational speed V by p times that of the conventional VTR, the recording capacity is further increased compared to the conventional PN.
The number of cylinders has doubled, making it possible to record and reproduce high-definition television signals, and also to realize recording in the same format using a small-diameter cylinder.

Embodiment FIGS. 1 to 4 show the head arrangement of an embodiment of the present invention. Here, it means a head in which the R and L azimuth angles are opposite to each other.

The system shown in Figure 1 has a cylinder diameter L and 4 heads e.
The head arrangement is 180", the tape winding angle is 1eao, and the cylinder rotation speed is westward. The R, , and L heads each record one track at the same time, and the next half rotation is performed by R2.
, L2 heads will record.

The system shown in FIG. 2 has a cylinder diameter of LX 3/4, six heads, a head arrangement of 120 degrees, a tape winding angle of 240 degrees, and a cylinder rotation speed of M X 4/3 rotations. R
Heads 1 and L simultaneously record one track for 2/3 cylinder revolutions, and the next 2/3 revolutions are recorded by heads R2,
The L2 head will record the next 273 rotations, and the R5 and L3 heads will record.

The system shown in FIG. 3 has a cylinder diameter LX2/3, the number of heads 8, a head arrangement 90, an Arp winding angle 270, and a Zolinda rotation speed Mx3/2. R,,
The L and L heads simultaneously record one track for 3/4 of a cylinder revolution, then the R2 and L2 heads record one track for the next 374 revolutions, and the R3 and L3 heads record the next 374 revolutions for the next 374 revolutions. will be recorded by head R4, L.

The system shown in Figure 4 has a cylinder diameter of approximately LIX 1/2, two heads, a tape winding angle of 36o, and a nolinda rotation speed of MX.
Consists of 2 rotations. This system always uses R, L, heads, but the tape wrapping angle is not completely 3600, and there is an angle at a very small angle K where the head and tape do not make contact, and here the signal may be lost. become. Therefore, the synchronization signal period of the video signal generated by the camera section is approximately (3
The cylinder rotation phase is controlled so that the tape is compressed to 60-K)/360 to take advantage of the time that can be lost, and the tape and head are not in contact at that time.

The recording formats recorded by the systems of FIGS. 1 to 4 of the above embodiments can all be the same.

In the above embodiment, the cylinder rotation speed V is, for example, 1800.
rpm, or 3600 rpm.

Further, in the above embodiment, the number of channels of the VTR is 2 channels, but the number of channels is not limited to 3 channels, 4 channels, or the like.

Effects of the Invention As described above, the present invention provides a rotary cylinder having a diameter L, a rotary cylinder having a plurality of n channels, two of which are arranged facing each other as one channel, and 2n heads (n: 2, 3, 4). ,5...
), the tape winding angle is approximately 180, the cylinder rotation speed is V, and the configuration is such that when the head in use in each channel leaves the tape, the other head begins to contact the tape, and at that time, the head in use A plurality of heads are arranged at a predetermined angle on a rotating cylinder having a predetermined diameter so that the first recording format is the same as the first recording format obtained when recording. Use the head to wrap the tape at a predetermined angle,
By recording at the cylinder rotation speed, the same format as the first recording format is generated while reducing the diameter of the cylinder. It has the advantage of being compact and lightweight when constructing a camcorder.

[Brief explanation of drawings]

1 to 4 are diagrams showing the head arrangement and recording pattern of a first embodiment of the present invention, and FIG. S is a head arrangement diagram of a conventional example.

Claims (3)

[Claims] (1) The tape winding angle is determined by using n channels and 2n heads (n is a natural number of 2 or more...), two of which are placed facing each other on a rotating cylinder with a diameter L. The cylinder rotation speed is approximately 180 degrees, the cylinder rotation speed is M, and the configuration is such that when the head in use in each channel leaves the tape, the other head begins to contact the tape, and at that time, the head in use is switched to the other head. One channel consists of three cylinders arranged at 120° intervals on a rotating cylinder having a diameter of L×3/4 so as to be the same as the first recording format obtained when recording. Using 3n heads, the tape winding angle is approximately 240°,
The cylinder rotation speed is M x 4/3, and in each channel, when the head in use leaves the tape, it is 1 in the rotation direction.
The present invention is characterized in that the head leading by 20 degrees starts to come into contact with the tape, and at that time, the head in use is switched to the head leading by 120 degrees to generate the same format as the first recording format. videotape recorder. (2) A plurality of n channels in which one channel is two disposed facing each other on a rotating cylinder having a diameter L, 2n
The tape winding angle is approximately 180°, the cylinder rotation speed is M, and when the head in use in each channel leaves the tape, the other head moves away from the tape. and has a diameter L x 2/3 so as to be the same as the first recording format obtained when recording while performing the operation of switching the used head to the other head at that time. One channel consists of four heads arranged at 90° intervals on a rotating cylinder. Using 4n heads, the tape winding angle is approximately 270°, the cylinder rotation speed is M x 3/2, and in each channel. , the head in use is configured so that when the head in use leaves the tape, the head that precedes the tape by 90° in the rotational direction begins to contact the tape;
A video tape recorder characterized in that the video tape recorder performs an operation of switching to a preceding head and generates the same format as the first recording format. (3) A plurality of n channels in which one channel is two disposed facing each other on a rotating cylinder having a diameter L, 2n
The tape winding angle is approximately 180°, the cylinder rotation speed is M, and when the head in use in each channel leaves the tape, the other head moves away from the tape. At that time, while switching the head being used to the other head, a diameter of approximately L x 1/2 is set so that it becomes the same as the first recording format obtained when recording. Using n heads arranged on a rotating cylinder, the tape winding angle is approximately 360°, the cylinder rotation speed is approximately M x 2, and K is the minute angle at which the heads do not contact the tape in each channel. , a video signal is generated by compressing the synchronization signal interval of the camera unit to a microscopic amount (360-K)/360°, and video information is not recorded at the microscopic angle of K, thereby achieving the first recording format. A videotape recorder characterized in that it produces identical formats.