JPH0413215A - Rotary head device - Google Patents

Abstract

PURPOSE:To miniaturize the device constitution by tracing a subtrack formed continuously to a main track trace by a head chip for main track by a head chip for subtrack. CONSTITUTION:The main track is formed by the head chip 2 for main track, and the subtrack is formed continuously to the main track by the head chip 4 for subtrack with the mounting height different from that of th head chip 2 for main track. Therefore, it is enough to wind a recording tape 101 on a rotary drum 1 only extending over an angle range to form the main track by the head chip 2 for main track. Thereby, it is possible to reduce a lapping angle without increasing the outside diameter of the rotary drum 1, and also, to form the main track and the subtrack satisfactorily, therefore, the constitution of the device can be miniaturized.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Industrial Field of Application The present invention relates to a recording and/or reproducing apparatus that records and/or reproduces information signals using a recording tape, such as a video tape recorder or a digital audio recorder. The present invention relates to a rotating head device used for.

89 Summary of the Invention The present invention provides a rotary head device used in a recording and/or reproducing apparatus that records and/or reproduces information signals using a recording tape, in which a recording tape is wound around a rotating drum at an angle. In addition to installing the head chip for the main track, the head chip for the sub-track is installed at a different height from the head chip for the main track, and this tip knob for the sub-track allows the main track to be traced to the main track. The recording tape is wound around the rotating drum so that information signals can be written to and/or read out from the subtracks without increasing the angle of the recording tape. This allows the configuration to be made smaller.

C1 Prior Art Conventionally, in video tape recorders, digital audio recorders, etc., recording and reading systems have been used to write and/or read high-density, high-frequency information signals onto and from magnetic tapes that serve as recording tapes. /Or in the playback device, information signals are written on the magnetic tape and/or
Alternatively, a magnetic head, which is a head chip that performs reading, is configured to perform so-called helical scanning (diagonal scanning) on the magnetic tape.

In such a recording and/or reproducing apparatus, a rotary head device is used to cause the magnetic head to perform a helical scan on the magnetic tape.

This rotating head device includes a rotating drum formed in a cylindrical shape. This rotating drum is rotatably supported around a central axis, and is rotated around the axis by a rotation drive device such as a motor. A magnetic head is attached to this rotating drum. This magnetic head has a distal end portion provided with a magnetic gap, for example, 20 to 30 mm away from the circumferential surface of the rotating drum.
It is attached so that it protrudes by a certain microscopic amount on the order of μm.

In a recording and/or reproducing apparatus using such a rotating head device, when the recording and/or reproducing mode is set, the magnetic tape is wound around the rotating drum at an angle and is fed. , the rotating drum is rotated. Then, the tip of the magnetic head comes into sliding contact with the magnetic tape in a direction inclined to the side edge of the magnetic tape, and a helical scan is performed.

By the way, in a recording and/or reproducing apparatus configured using such a rotary head device, the angular range in which the magnetic tape is wound around the rotary drum, the so-called ramp angle, is approximately 210 degrees, and the above-mentioned When the magnetic head moves within a range of 180° of the wrap angle, it writes, for example, a video signal to form a main track, and when it moves within the remaining approximately 30° range, it writes a video signal, for example, into a digital signal. Some devices are configured to write audio signals to form sub-tracks. A main track and a sub-track formed by such a recording and/or reproducing device are formed continuously with each other.

Further, Japanese Patent Application Laid-Open No. 60-70883 describes a rotary head device previously proposed by the applicant. This rotary head device has four magnetic heads mounted on a rotary drum at angular intervals of 90° from each other. In a recording and/or reproducing apparatus using this rotary head, the magnetic tape is wound around the rotary drum over an angular range of (270+α) degrees and is fed. In this recording and/or reproducing apparatus, when the magnetic head is moved within an angular range of 270° in which the magnetic tape is wound around the rotating drum, A video signal corresponding to the magnetic tape is supplied to form a main track, and the magnetic head is moved within the angular range α, for example, 40° to 50° within the angular range in which the magnetic tape is wound around the rotating drum. Sometimes audio signals are provided to form sub-tracks.

In this rotary head device, four magnetic heads are installed at the same height, so the outer diameter of the rotary drum is smaller than in the above-mentioned rotary head device with a wrap angle of approximately 210°. It can be made smaller, and the device configuration can be made smaller.

D6 Problems to be Solved by the Invention By the way, as mentioned above, writing and/or reading of information signals to the main track and writing and/or reading of information signals to the sub-tracks that follow this main track, In a rotary head device configured to use the same magnetic head, it is possible to reduce the angle at which the magnetic tape is wound around the rotary drum, that is, the wrap angle, without increasing the outer diameter of the rotary drum. Can not do it.

When this wrap angle becomes large, the running resistance when feeding the magnetic tape increases, making it impossible to downsize the drive mechanism for feeding the magnetic tape. Also, when this wrap angle becomes large, The torque required to rotate the rotary drum increases, making it impossible to downsize the rotary drive mechanism for rotating the rotary drum. Therefore, in a recording and/or reproducing apparatus using such a rotary head device, it is not possible to downsize the device configuration and reduce power consumption.

Therefore, the present invention is proposed in view of the above-mentioned circumstances, and it is possible to reduce the wrap angle without increasing the outer diameter of the rotating drum, and to form a main track and a sub-track well. An object of the present invention is to provide a rotary head device that can reduce the size and power consumption of a recording and/or reproducing device.

Means for Solving the E0 Problems In order to solve the above-mentioned problems and achieve the above-mentioned objects, a rotary head device according to the present invention includes a rotary drum around which a recording tape is wound at an angle, and a rotary drum on which a recording tape is wound at an angle. The head chip for the main track is installed with the tip facing the circumferential side of the rotating drum, and the head tip for the main track is mounted on the rotating drum with the tip facing the circumferential side of the rotating drum. and a sub-track head chip attached to the sub-trunk head chip, and the sub-trunk hent chip traces a sub-track formed continuously to the main track formed on the recording tape, which is traced by the main track hent chip. It is what it is.

F0 effect In the rotary head device according to the present invention, the main track is formed by the main track head chip,
The head chip for the main track is attached to a head chip for the sub-track that has a different height to form a sub-track continuous to the main track, so the recording tape is attached to the rotating drum by the head chip for the main track It is sufficient to wrap it only over the angular range for forming the main track.

G. Examples Specific examples of the present invention will be described below with reference to the drawings.

In this example, a rotary head device according to the present invention is used to write and read video signals to and from a main track on a magnetic tape serving as a recording tape, and to write and read audio signals to and from a sub-trunk on the magnetic tape. This is an example configured as a rotary head device used in a recording and reproducing apparatus configured to perform the following operations.

This rotary head device uses a plurality of video signal magnetic heads, which serve as main track chips, and a plurality of audio No. 3 magnetic heads, which serve as sub-track head chips, to perform so-called helical scanning ( (diagonal operation).

This rotary head device, as shown in FIG. Two audio signal magnetic heads 4 and 5 are attached.

The rotating drum 1 is made of a metal material such as aluminum and is formed into a cylindrical shape with a radius r. This rotating drum 1 is connected to a chassis (not shown) of a recording and reproducing apparatus in which this rotating head device is used.
It is rotatably supported around an axis, and is driven at a predetermined constant angular velocity ωrad/s by a rotational drive device (not shown).
It is rotated by ec.

Each of the magnetic heads 2, 3, 4.5 has a magnetic gap at its tip, and the tip is placed outward from the circumferential surface of the rotating drum 1 with a predetermined gap of, for example, about 20 to 30 μm. It is attached to this rotating drum 1 with a minute amount of protrusion.

As shown in FIGS. 1 and 2, the first and second video signal magnetic healds 2.3 are mounted at equal height positions with respect to the rotating drum 1, as shown in FIG. As shown by arrow A, they are attached with an angular interval of πrad (180°) from each other.

- the first and second audio signal magnetic heads 4.
Reference numeral 5 indicates that each of the video signal magnetic heads 2.3 is mounted at the same height position with respect to the rotating drum 1.
The mounting positions differ by a distance d as shown by the arrow d in Figures 2 and 3, and the mounting positions have an angular spacing of πrad from each other, as shown by the arrow B in Figure 1. installed. Furthermore, each of these magnetic heads 2, 3,
4.5 includes the first video signal magnetic head 2 and the first audio signal magnetic head 4, and the second video signal magnetic head 3 and the second audio signal magnetic head 5. are attached so as to form a predetermined angle Φrad, as shown by the arrows in FIG.

Here, the mounting height position of the magnetic head refers to the distance from the end of the rotating drum 1 to the magnetic head in the axial direction of the rotating drum 1, for example.

Further, the first video signal magnetic head 2 and the first audio signal magnetic head 4 have the same azimuth angle. The second video signal magnetic head 3 and the second audio signal magnetic head 5 have different azimuth angles from those of the first video signal magnetic head 2, but have mutually equal azimuth angles. have.

In a recording and reproducing apparatus configured using this rotary head device, the magnetic tape 101 is connected to first and second tape guides 6 arranged in pairs on both sides of the rotary drum 1. 7, the rotating drum 1 is guided by the rotating drum 1 over an angular range of πrad, which is a so-called wrap angle, as shown by the arrow C in FIG. 1, and as shown in FIG. As shown by the middle arrow θWmAF in FIGS. 2 and 3, the winding is inclined at a predetermined angle θ□1 with respect to the axial center of the winding. This magnetic tape 101 has a constant width as indicated by arrow W in FIGS. 2 and 3. Further, this magnetic tape 101 is fed at a constant speed υ7 by a drive device (not shown).

In the recording and reproducing apparatus configured using this rotary head device as described above, when the magnetic tape 101 is fed and the rotary drum 1 is rotated, the first or second Video signal magnetic head 2
．． 3 is a portion of the width of 6/7 of the magnetic tape 101, that is, (6/7).
It is in sliding contact with a portion having a width of W. The sliding contact trajectory of each video signal magnetic head 2.3 with respect to the magnetic chip 1101 becomes the main track TM.

In this main track ray, the rotating drum 1 is
During the time (π/ω) required for the magnetic tape 101 to be rotated d, the magnetic tape 101 is fed a distance of (π/ω)·υ, so as shown in FIG. On the other hand, it is formed to be inclined by a predetermined angle θ, indicated by an arrow θIIEc in FIG.

Note that the distance 1ial (π/ω) by which the magnetic tape 101 is sent when the rotating drum 1 is rotated by πrad,
υ7 corresponds to the track pitch of the main track TM.

In this way, by continuing the rotation of the rotary drum 1 and the feeding operation of the magnetic tape 101, a main track formed by the first video signal magnetic head 2 is formed on the magnetic tape 101. T9 and the second
The main tracks TM formed by the video signal magnetic head 3 are arranged alternately at a distance (π/ω)/0 tracks in the feeding direction of the magnetic tape 101. In this way, when recording information signals on the magnetic tape 101 using this recording and reproducing apparatus, the first and second video signal magnetic heads 2.
3, as shown in FIG.
For each time π/ω is rotated by ad, that is,
Video signals are supplied alternately.

On the other hand, sub-tracks T are formed on the magnetic tape 101, each corresponding to each main track TM formed as described above.

The audio signal written on this sub-track T is the main track Tll corresponding to this sub-track T, that is, the main track T that is formed in a continuous state with this sub-track T. This signal corresponds to the video signal written to the . This sub-track T is formed by rotating the rotating drum 1 by (π/6) rad, which is 1/6 of the wrap angle, so that the sub-track T is a portion of the width of 1/7 of the magnetic tape 101, that is, (1 /7)・It is formed in the width part of W. This sub track T, and the above main track T
9 is formed in a continuous state, and the magnetic tape 10 is
The state is similar to that of a track formed by rotating the rotary drum 1 by (7/6) π rad with respect to the entire width of 1, that is, the width of W.

By the way, in this rotary head device, the first video signal magnetic head 2, the first audio signal magnetic head 4, the second video signal magnetic head 3, and the second audio signal magnetic head 4 are used. The magnetic heads 5 are mounted at different heights by a distance Md. Therefore, as shown in FIG. 3, the first video signal magnetic head 2 and the first audio signal magnetic head 4 form the main track TM and the sub-track T in parallel. can do. Here, as shown in FIG. 4, if the formation of the main track T and the sub-track T formed in parallel is completed at the same time, the formation start position of the main track T and the sub-track It is separated from the formation end position of T by a distance of 11tn·(π/ω)·υT. However, in the above formula, n is a natural number. And here, the above distance d is d=(n+1)・(π/ω)−vl・Sin
It is set so that θWIIAP (Equation 1).

Therefore, in a recording and reproducing apparatus configured using this rotary head device, corresponding video and audio signals are written in the main track T and the sub-trunk T, which are formed in a continuous manner. , the audio signal is delayed, and each of the video signal magnetic heads 2.
3 and each audio signal magnetic head 4.5.

That is, as shown in FIG. 4, the main track Tel@ formed by the first video signal magnetic head 2 is
of the audio signal corresponding to the video signal written in the first
sub-track T by the magnetic head 4 for audio signals. Writing is performed on the main track T by the first video signal magnetic head 2.

The process ends when the time nπ/ω has elapsed since the end of writing the audio signal to the audio signal. Similarly, sub-tracks T and 1 are formed by the second audio signal magnetic head 5 of the audio signal corresponding to the video signal written in the main track TMI formed by the second video signal magnetic head 3. From the time when the second video signal magnetic head 3 finishes writing the audio signal to the main tracks T and l,
The process is terminated when the time nπ/ω has elapsed. In addition, here, the above natural number n is obtained from the above first equation as follows: n=dω/(π・od・Sin θ−RAP)
1...(2nd formula) Therefore, the above time nπ/ω is nx/ω=d/(vd・Sin θ−++ar)
K/a+ (3rd formula) % formula % In this way, the recording and reproducing apparatus configured using the rotary head device according to the present invention records on the magnetic tape 101. In reproducing the information signal,
When using the rotary head device according to the present invention, the video signals written in the main track T9 are read out by the video signal magnetic heads 2.3, and in parallel, the video signals are read out from the video signal magnetic heads 2.3. The audio signal written on the subtrack T is read out by the magnetic head 4.5. In this case, it is necessary to use the video signal with a delay among the read video signal and audio signal, contrary to the case of writing.

In addition, the above-mentioned magnetic head is operated using a rotary head device configured to continuously read the video signal written on the main track TM and the audio signal written on the sub-track T with the same magnetic head. When reproducing the information signal recorded on the tape 101, the video signal and audio signal corresponding to each other are read out successively, so there is no need to delay the signals as described above.

In addition, in such a rotary head device configured to read the main track TN and the sub-track T continuously with the same magnetic head,
The so-called wrap angle needs to be (7/6)π rad.

The rotary head device according to the present invention, as in the above-mentioned embodiment,
The present invention is not limited to a structure in which a video signal is written to the main track TH and an audio signal is written to the sub-track T. That is, the main track T and the sub track T.

It can be configured to write various information signals in addition to video signals and audio signals.

H0 Effects of the Invention As described above, in the rotary head device according to the present invention, the main track is formed by the main track head chip, and the sub-track head chip is installed at a different height from the main track head chip. Thus, a sub-track that is continuous with the main track is formed.

Therefore, in this rotary head device, the recording tape only needs to be wound around the rotary drum over an angular range in which the main track is formed by the main track head chip.

Therefore, in this rotary head device, the wrap angle can be reduced without increasing the outer diameter of the rotary drum, and the main track and sub-track can be formed well.

That is, the present invention can provide a rotary head device that makes it possible to downsize the configuration of a recording and/or playback device and reduce power consumption.

[Brief explanation of drawings]

FIG. 1 is a plan view schematically showing the structure of a rotary head device according to the present invention, and FIG. 2 is a side view schematically showing the structure of the rotary head device. FIG. 3 is a side view schematically showing the shapes of the main track and sub-trunk formed on the magnetic tape by the rotary head device. FIG. 4 is a time chart showing the timing of supplying information signals to each magnetic head of the rotary head device when forming main tracks and sub-tracks on the magnetic tape.

Claims (1)

[Scope of Claims] A rotating drum on which a recording tape is wound at an angle; a main track head chip attached to the rotating drum with its tip facing the circumferential surface of the rotating drum; A sub-track head chip is provided, the tip of which faces the circumferential surface of the rotating drum, and is mounted at a different mounting height position from the main track head chip, and the sub-track head chip is attached to the main track. A rotary head device in which a sub-track formed continuously with a main track formed on the recording tape traced by a head chip for tracing is traced.