JPH05182153A - Video tape recorder - Google Patents

Abstract

PURPOSE:To make a head cleaning possible even when a temporary stop is repeated for a long time by executing the head cleaning pressing the cleaning roller to a rotary drum at a specified timing when a video signal is recorded on a magnetic tape intermittently. CONSTITUTION:A video signal SV outputted from a computer 2 is given to a recording/reproducing circuit 12 and converted into a recording signal. Thus, an image recording signal is outputted to magnetic heads 15A and 15B and the video signal SV is recorded. Entire operations are controlled by a mode controller 21 constituted of an arithmetic processing circuit and a magnetic tape 16 is intermittently driven. That is, a control S1 is outputted to a mechanism controller 22 responding to an operation signal S2 outputted from a key switch 23 by the controller 21 to control the magnetic tape travelling system. Further, a control signal S3 is outputted to a cleaning device 30 by the controller 21 at a specified timing and the magnetic heads 15A and 15B are cleaned at a specified timing.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Field of Industrial Application Conventional Technology Problem to be Solved by the Invention (FIG. 5) Means for Solving the Problem (FIGS. 1 and 4) Action (FIGS. 1 and 4) Example (1) Overall Configuration (FIG. 1) (2) Cleaning device (Fig. 2) (3) Intermittent recording mode (Fig. 3) (4) Cleaning operation (Fig. 4) (5) Effect of the embodiment (6) Effect of the other embodiment of the invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video tape recorder, and can be applied, for example, to a case where a computer is connected to successively record images created by the computer.

[0003]

2. Description of the Related Art Conventionally, in a video tape recorder, a rotating drum equipped with a magnetic head is rotated at a predetermined speed, and a magnetic tape wound around the rotating drum is run at a predetermined speed so that a gap between the magnetic tape and the magnetic head is increased. It is designed to improve the relative speed of and to record a wideband video signal. In the video tape recorder for this purpose, when loading and unloading the magnetic tape, a predetermined cleaning roller is pressed against the rotating drum, thereby cleaning the magnetic head,
It is designed to prevent head claws and the like.

[0004]

By the way, in this type of video tape recorder, it would be convenient if a computer could be connected and the images created by the computer could be recorded sequentially.

That is, as shown in FIG. 5, in the computer 2, when the image data is sequentially generated under the condition set by the user and the image data is accumulated for one frame,
The video signal SV is converted and output. On the other hand, the video tape recorder 3 is held in the pause state in the recording mode, and when the video signal SV is output, the pause state is released and the video signal SV is recorded.

In this way, the video signal intermittently output by the computer 2 at a predetermined cycle can be recorded in a continuous recording track, and the recorded magnetic tape is reproduced, as if processed in real time. A computer graph can be created.

In reality, however, the computer 2 requires about 30 seconds to generate one frame of image data. For this reason, in the video tape recorder 3, even when a computer graphic with a short time is created, the pause state is repeated for a long time, and there is a problem that the head cleaning is not carried out for a long time.

The present invention has been made in consideration of the above points, and a video can be head-cleaned by intermittently recording a video signal and repeating a paused state for a long time. It is intended to propose a tape recorder.

[0009]

In order to solve such a problem, in the present invention, the magnetic tape 16 wound around the rotary drum 13 is intermittently run while the rotary drum 13 is rotated at a predetermined rotational speed. As a result, in the video tape recorder 10 in which the recording tracks are sequentially formed on the magnetic tape 16 obliquely in accordance with the running of the magnetic tape 16 and the video signal SV is recorded on the recording tracks, during a period other than the period for forming the recording tracks, The cleaning roller 25 is pressed against the rotary drum 13 at a predetermined timing, and the magnetic heads 15A, 1A mounted on the rotary drum 13 are attached.
Clean 5B.

[0010]

If the cleaning roller 25 is pressed against the rotary drum 13 at a predetermined timing and the magnetic heads 15A and 15B mounted on the rotary drum 13 are cleaned during a period other than the period for forming the recording track, the image is intermittently displayed. Head cleaning can be performed even when a signal is recorded and the pause state is repeated for a long time.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings.

(1) Overall Configuration In FIG. 1, reference numeral 10 denotes an image recording apparatus using a computer as a whole, and the video signal SV created by the computer 2 is recorded on a magnetic tape 16.

That is, in the image recording apparatus 10, the video signal SV output from the computer 2 is given to the recording / reproducing circuit 12 and converted into a recording signal here. As a result, in the image recording apparatus 10, the recording signal can be output to the magnetic heads 15A and 15B to record the video signal SV.

On the other hand, in the image recording apparatus 10, at the time of reproduction, the reproduction signal S5 output from the magnetic heads 15A and 15B is demodulated by the recording / reproducing circuit 12, and thereby the video signal recorded on the magnetic tape 16 is reproduced. It is designed to be able to do.

The magnetic tape 16 is wound around the rotary drum 13 via the guide posts 14A and 14B, and the rotary drum 13 is mounted with the magnetic heads 15A and 15B and is rotated at a predetermined speed. As a result, at the time of recording, the magnetic tape 16 runs intermittently at a predetermined cycle to sequentially form recording tracks. Therefore, in the image recording apparatus 10, the mode controller 21 having the arithmetic processing circuit configuration is used.
The entire operation is controlled by using the magnetic tape 16 during recording.
Drive intermittently.

That is, the mode controller 21 controls the entire operation in response to the operation signal S2 output from the key switch 23, and at this time outputs the control signal S1 to the mechanism controller 22 to control the magnetic tape running system and the like. To do. Further, the mode controller 21 outputs the control signal S3 to the cleaning device 30 at a predetermined timing, thereby intermittently recording the video signal and repeating the paused state for a long time. Heads 15A and 15B are head-cleaned.

(2) Cleaning Device Here, in the cleaning device 30, the plunger 24 is driven by the control signal S3 of the mode controller 21,
The cleaning roller 25 is driven by the driving force of the plunger 24.
Is pressed against the rotary drum 13. At this time, in the cleaning device 30, the cleaning roller 25 is pressed against the rotating drum 13 from the side surface on which the magnetic tape 16 is not wound, whereby the magnetic heads 15A and 15A are wound with the magnetic tape 16 wound around the rotating drum 13.
Head clean B.

That is, as shown in FIG. 2, the cleaning device 30 fixes the plunger 24 to the chassis via the supporting member 31, and the movable iron core tip 2 of the plunger 24 is fixed.
The connecting member 33 is connected to 4A.

Here, the connecting member 33 is rotatably supported on the support member 31 via a predetermined rotation center shaft 33A, and a protrusion 33C is formed on the cut-and-raised portion 31A of the support member 31. By hitting, the rotation range is limited. Further, the connecting member 33 has an oval through hole 33B, and the pin 24B that is set up at the movable iron core tip 24A of the plunger 24 is held so as to pass through the through hole 33B. The driving force of the plunger 24 is transmitted via the. As a result, when the plunger 24 is driven and the movable iron core tip 24A moves as shown by the arrow a, the connecting member 33 rotates about the rotation center shaft 33A as shown by the arrow b. Has been done.

Further, the connecting member 33 has a cut-and-raised portion in an extended portion of the plunger 24, and the driving force of the plunger 24 is transmitted to the roller support member 36 via a spring 35 hooked on the cut-and-raised portion. .. That is, the roller support member 36 is rotatably supported on the support member 31 via a predetermined rotation center shaft 36A, and the roller support member 36 is erected from the support member 31 and extends through the through hole 36B. The rotation range is limited by 31B.

Further, the roller support member 36 has a tip portion 3
The cleaning roller 25 is rotatably held by 6C, and the cleaning roller 25 comes into contact with the side surface of the rotary drum 13 on which the magnetic tape 16 is not wound. As a result, when the plunger 24 is driven to move the movable iron core tip 24A as indicated by the arrow a, the roller support member 36 is rotated via the spring 35 as indicated by the arrow c, thereby cleaning. The roller 25 is pressed against the rotating drum 13.

At this time, in the roller support member 36,
Since the driving force is transmitted through the spring 35, the cleaning roller 2 is pressed with a pressing force determined by the strength of the spring 35.
5 is pressed against the rotary drum 13, so that in the cleaning device 30, the spring 35 can be selected to easily set the pressing force of the cleaning roller 25 to an optimum value.

Further, at this time, the cleaning device 30
In the above, since the cleaning roller 25 is disposed so as to contact the side surface of the rotating drum 13 on which the magnetic tape 16 is not wound, head cleaning can be performed while the magnetic tape 16 is still wound on the rotating drum 13. As a result, head cleaning can be performed as necessary even in a still state or the like.

(3) Intermittent recording mode In the intermittent recording mode, the mode controller 21
By pre-rolling the magnetic tape to form recording tracks, recording tracks are sequentially formed obliquely according to the recording format, and thereby the video signal SV output intermittently is recorded.

That is, as shown in FIG. 3, in the mode controller 21, when the intermittent recording mode is set after the magnetic tape 16 is indexed (FIG. 3A), the operation mode of the image recording apparatus 10 concerned. Is switched to the reproduction mode, and after rewinding the magnetic tape 16 for a predetermined time PR1 from the cueed position based on the time code,
The still image reproduction STILL1 is maintained (see FIG. 3).
(B)).

Subsequently, when a recording start command is input from the computer 2, the mode controller 21 takes in a video signal that is input subsequently to a frame memory circuit (built in the recording / reproducing circuit 12) and stops the operation. The image reproduction state is released and the magnetic tape 16 is reproduced, whereby the running speed of the magnetic tape 16 is raised to a steady state. As a result, when the running speed of the magnetic tape 16 rises to a steady state, the mode controller 21 sequentially counts the time codes, and when the magnetic tape runs to the indexing position after the preroll period PR1 has elapsed (FIG. 3).
(C)), switching to the recording mode.

As a result, the mode controller 21 converts the image data stored in the frame memory circuit into a recording signal and outputs the recording signal to the magnetic heads 15A and 15B, and records the video signal FR1 for one frame from the position where the head is located.

Further, when the recording of the video signal FR1 is completed, the mode controller 21 switches to the reproduction mode again, rewinds the magnetic tape 16 for a predetermined time PR2, and then switches to the state of still image reproduction STILL2 ( FIG. 3D). When a recording start command is further input from the computer 2, the video signal is taken into the frame memory circuit, and the magnetic tape 16 starts running,
After the lapse of the pre-roll period PR2, the mode is switched to the recording mode (FIG. 3 (E)), and the video signal FR2 for the subsequent one frame is recorded.

Thus, by repeating the recording / reproducing operation (FIGS. 3F and 3G), the image recording apparatus 1
At 0, the video signals SV intermittently output from the computer 2 can be sequentially recorded, and when the magnetic tape 16 is reproduced, a computer graphic as if created in real time can be obtained.

(4) Cleaning Operation Further, when the power is turned on, the mode controller 21 executes the processing procedure shown in FIG. 4 to perform head cleaning at a predetermined timing.

That is, in the processing routine RTO, the mode controller 21 outputs a control signal to the mechanism controller 22 in step SP1 to take in the operation mode of the image recording apparatus 10, and then proceeds to step SP2.

Here, the mode controller 21 determines whether or not the rotary drum 13 is rotating. That is, in the image recording apparatus 10, when the magnetic tape 16 is wound around the rotary drum 13, the rotation of the rotary drum 13 is started and then loaded, and when the rotary drum 13 is rotating, the magnetic tape 16 is rotated. Can be determined to be wound, immediately before being wound, or immediately after being unwound. If a positive result is obtained here, the mode controller 21 moves to step SP3, counts up the built-in counter, and then moves to step SP4. On the other hand, when a negative result is obtained in step SP2, the mode controller 21 directly moves to step SP4. As a result, the mode controller 21
The count value of the counter is sequentially counted up according to the presence or absence of rotation of the rotary drum 13, and the time during which the rotary drum 13 is rotating can be detected based on the count value.

Subsequently, the mode controller 21 determines in step SP4 whether or not the operation mode of the image recording apparatus 10 is the still image reproducing mode. If a negative result is obtained here, the mode controller 21 proceeds to step SP5. Here, the mode controller 21 uses the key switch 2 of the image recording apparatus 10.
3 is operated, and if a positive result is obtained here, it is determined whether the operation mode input via the key switch 23 corresponds to stop, magnetic tape loading or magnetic tape unloading. Judge whether or not.

When a negative result is obtained here, the mode controller 21 returns to step SP1 and repeats the processing procedure. On the other hand, when a positive result is obtained in step SP5, the mode controller 21 moves to step SP7 and drives the plunger 24 to press the cleaning roller 25 against the rotary drum 13 for 1 second. As a result, in the image recording apparatus 10, the magnetic heads 15A and 15B are head-cleaned for 1 second when the magnetic tape 13 is loaded or unloaded when the reproducing operation or the like is stopped. It is designed to prevent this.

When the head cleaning is completed in this way, the mode controller 21 proceeds to step SP8 to clear the counter and then returns to step SP1 to repeat the processing procedure.

On the other hand, when the operation mode of the image recording apparatus 10 is set to the still image reproduction mode, a positive result is obtained in step SP4, and the mode controller 21 moves to step SP6. Here, the mode controller 21 detects the count value of the counter and determines whether or not the rotation of the rotary drum 13 has continued for 20 minutes or more. If a negative result is obtained here, the step S
While returning to P1 and repeating the processing procedure, if a positive result is obtained here, the process proceeds to step SP7.

As a result, in the image recording apparatus 10, for example, when the intermittent recording mode is continued for 20 minutes and the still image reproduction state is currently maintained (symbol ST in FIG. 3).
ILL1, STIL2, etc.) and when the still image reproduction mode has passed for 20 minutes or more, the plunger 24 is driven to perform head cleaning.

Therefore, in the image recording apparatus 10,
Even if the video signal is intermittently recorded and the paused state is repeated for a long time, the head cleaning can be performed, thereby preventing the head crossing and the like and preventing the deterioration of the quality of the reproduced image. be able to. Furthermore, in the intermittent recording mode, when the still image reproduction state is maintained, the image recording apparatus 10 outputs the video signal for one frame once fetched in the frame memory circuit as the reproduction output. ..

As a result, in the image recording apparatus 10, the creaming head 25 is pressed to rotate the rotary drum 1
Even if the rotation speed of No. 3 is decreased, the disturbed image is not output.

(5) Effects of the Embodiments According to the above configuration, when the intermittent recording mode continues for 20 minutes, the magnetic tape is wound on the rotary drum and the side surface not wound with the magnetic tape is cleaned. By pressing the roller to perform the head cleaning, the head signal can be intermittently recorded and the head cleaning can be performed even when the state of the pause state is repeated for a long time.

(6) Other Embodiments In the above embodiment, the case where the head cleaning is performed when the intermittent recording mode is continued for 20 minutes has been described, but the present invention is not limited to this, and the 20th embodiment is applicable.
You can freely set the minutes.

Further, in the above-mentioned embodiment, the case where the video signal is intermittently recorded by connecting to the computer 2 has been described, but the present invention is not limited to this, and the video signal is continuously output from, for example, a television camera. It can be widely applied to the case of intermittently capturing and recording a video signal.

[0043]

As described above, according to the present invention, when the video signal is intermittently recorded on the magnetic tape, the cleaning roller is pressed against the rotary drum at a predetermined timing to perform the head cleaning, so that the temporary stop state is obtained. Even when the above condition is repeated for a long time, a video tape recorder capable of head cleaning can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing an image recording apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view showing the cleaning device.

FIG. 3 is a schematic diagram used to describe an operation in the case of intermittently recording a video signal.

FIG. 4 is a flow chart used to explain a cleaning process.

FIG. 5 is a schematic diagram showing a configuration for recording an image created by a computer.

[Explanation of symbols]

2 ... Computer, 10 ... Image recording device, 13 ...
Rotating drum, 15A, 15B ... Magnetic head, 16 ...
Magnetic tape, 21 ... mode controller, 24 ... plunger, 25 ... cleaning roller.

Claims (1)

[Claims] 1. A magnetic tape wound around the rotary drum is intermittently run in a state where the rotary drum is rotated at a predetermined rotational speed, so that the magnetic tape is sequentially slanted in accordance with the running of the magnetic tape. In a video tape recorder for forming a recording track on the recording tape and recording a video signal on the recording track, in a period other than the period for forming the recording track,
A video tape recorder, wherein a cleaning roller is pressed against the rotary drum at a predetermined timing to clean the magnetic head mounted on the rotary drum.