JPH081713B2 - Magnetic recording / reproducing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a magnetic recording / reproducing apparatus suitable for application to a video tape recorder, and particularly when a so-called continuous shooting is performed by the video tape recorder, the reproduction screen is This is to avoid discontinuity in the screen due to discontinuity.

[Conventional technology]

In the case of so-called continuous shooting of one scene and the next scene by a video tape recorder, the tape is returned by a certain amount at the end of the one scene and waits. Running the tape, the reference signal of the video tape recorder,
The CTL signal, rotary magnetic head device, capstan servos, etc. are automatically switched to the recording state while their phase relationships are matched, and the ones that continue recording the next scene are already available. Proposed.

For example, as shown in Japanese Utility Model Laid-Open No. 51-150107, after temporarily stopping recording of a video signal, an idler is pressure-bonded between a capstan (for running a tape at a constant speed) and a pinch roller. In some cases, the tape wound around the pinch roller is moved in the direction opposite to that during recording. In this case, there is a problem that it is difficult to keep the tape return amount constant.

Further, as shown in JP-A-53-82403,
After temporarily stopping the recording of the video signal, the moving plate is moved to move the magnetic tape path from the solid line position (straight line state) to the dotted line position (two sides of the triangle), and thus the tape is extended by the length of the path. Some are configured to return.
In this case, a mechanism for returning the tape is additionally required, and there are problems that the lap angle with respect to the head is different because the tape path is different.

[Problems to be solved by the invention]

According to the present invention, when the recording is temporarily stopped, the tape is returned by an accurate amount, the amount of return is always constant, and the amount can be changed as necessary. Therefore, it does not require a particularly complicated mechanism.

[Means for solving problems]

In the present invention, when the recording is temporarily stopped, or when the recording is paused,
The tape loading guide (6) is moved in the unload direction by a predetermined amount (angle α) from the recording state (see FIG. 1) as shown in FIG. 2, and the magnetic tape (4) is wound. A brake is applied to the take-up side, the slack of the magnetic tape (4) generated at this time is taken up on the supply reel (2) side of the magnetic tape (4), and the magnetic tape (4) is wound around the tape guide drum (5). After releasing the brake on the take-up side while fixing it with the brake device (12) so that it will not slide, the tape loading guide (6) is fed while the magnetic tape (4) is being fed out from the take-up side and the supply side. The position of the magnetic tape (4) on the tape guide drum (5) is displaced in the rewinding direction by a length corresponding to a predetermined amount by moving it to the position of the recording state again (third part). See figure).

[Work]

By moving the tape loading guide (6) by an angle α in the unloading direction from the state shown in FIG. 1 to the state shown in FIG. 2, the tape (6) guided by the tape loading guide (6) ( 4) Slack occurs, and by winding (rewinding) this on the supply reel (2) side,
There is no slack.

In this state, the magnetic tape (4) is wound around the tape guide drum (5) and fixed by a brake device (12) so as not to slide, and the tape loading guide (6) is again moved to the recording position. By
The tape (4) is fed from the take-up reel on the take-up side and from the supply reel on the supply side around the fixed portion by the brake device (12), and the tape (4) to the tape guide drum (5)
Can be shifted to the supply reel (2) side from the position when recording is stopped, and the amount of this movement can be determined by the rotation angle α of the tape loading guide (6). It is a thing.

〔Example〕

An example of the magnetic recording / reproducing apparatus according to the present invention will be described below with reference to FIGS. 1 to 4.

(1) is a tape cassette, (2) and (3) are tape supply reels and take-up reels therein, and (4) is a magnetic tape wound around them. (5) is a tape guide drum of the rotary magnetic head device, and (6) is a tape loading guide, and in this example, a so-called loading ring is used, which will be described below as a ring. The ring (6) has a double structure (not shown) in the vertical direction, and will be described with reference numerals (6a) and (6b). The upper and lower rings (6a) and (6b) rotate about their centers in opposite directions. The rotation (drive) of this ring is performed by a loading motor (not shown).
Performed by. (7a) shows the guide pin attached to the upper ring (6a), and (7b) shows the Gaio pin attached to the lower ring (6b).

FIG. 1 shows the loading state of the tape (4) at the time of recording. The tape (4) fed from the supply reel (2) is a tension regulator (not shown).
The tension is imparted by the guide pin (8) attached to the tape, guided through the guide pin (9) to the pin (7a) of the ring (6a), goes around the tape guide drum (5), and further the ring (6b). The tape is driven at a constant speed by a tape constant speed drive device (10) including a capstan (10a) and a pinch roller (10b), and is wound on a take-up reel (3). Has been done. (11)
Is the control head. The loading state of the magnetic tape during reproduction is the same as in FIG.

Further, a brake device (12) for the tape (4) wound around the tape guide drum (5) is provided so as to face the tape guide drum (5). As an example of this brake device (12), the rod (14) of the solenoid (13) is shown in FIG.
One end of the sub brake lever (15) is pivotally supported by the shaft (16), and a substantially middle portion of the sub brake lever (15) is rotatably supported by the shaft (18) with respect to the fixed portion (17). , And the main brake lever (19) for this shaft (18)
Of the spring (23) wound around the shaft (18) with respect to the projections (21) and (22) projecting on both levers. The end is locked. Therefore, the main brake lever (19) is rotatably biased clockwise about the shaft (18) in FIG. The rod (14) is always biased to the right in the figure by the return spring (25) installed between the rod (14) and the fixed portion (24). In this way, the brake device (12) is formed.

This brake device (12) is always a solenoid (13)
When not energized, the auxiliary brake lever (15) is inclined as shown by the dotted line in FIG. 4, so that the pad (20) is separated from the tape guide drum (5). When the solenoid (13) is energized, the rod (14) moves to the left against the tension of the return spring (25) and the auxiliary brake lever (1
5) rotates from the position shown by the dotted line to the position shown by the solid line. Along with this, the main brake lever (19) also rotates, and at this time, the pad (20) contacts the tape guide drum (5) via the tape (4). The contact pressure at this time is determined by the tension of the spring (23). In the tape guide drum (5), at least one of the upper and lower guide drums is formed as a so-called fixed drum, and the main brake lever (19) described above is used.
The pad (20) of (1) is abutted against the fixed drum while avoiding the rotating part including the rotating magnetic head. This is the braking device (1
This is because when the brake is applied to the tape (4) by 2), the tape is securely fixed (stopped) and the rotating magnetic head is not damaged.

When the tape cassette (1) is ejected, the rings (6a) and (6b) are rotated in the unloading direction, that is, the guide pin (7a) is rotated counterclockwise and the guide pin (7b) is rotated. This is unloaded because it is rotated clockwise and positioned in the cassette (1) as shown by the alternate long and short dash line, and at the same time, the tape (4) is wound around the cassette (1) (due to the rotation of the reel). Not only when the tape (4) is loaded onto the tape guide drum (5) but also when the tape is loaded on the brake device (12), the brake is prevented from being locked. The mounting position of the device (12) is selected.

 Next, the operation will be described.

In the recording state shown in FIG. 1, when the guide pins (7a) and (7b) are viewed from the center of the tape guide drum (5),
An angle θ is maintained for each center line, whereby the tape (4) is wound around the tape guide drum (5) with a predetermined winding angle. When shifting from this state to the pause state (for example, when releasing the fingertip from the push switch for recording in the video camera), the rolling contact of the pinch roller (10b) to the capstan (10a) is released, and the tape (4) is transferred. Stops. However, the rotating magnetic head device continues to rotate. At this time, the CTL signal is recorded on the tape (4) by the control head (11) in a portion before this. Fig. 1 ~
In FIG. 3, the tape portion on which the CTL signal is recorded is shown by a dotted line in order to make it easy to understand. Also CTL
The point at the end of the recording of the signal is indicated by P.

Next, the rings (6a) and (6b) are rotated in the unloading direction by a predetermined amount, that is, a predetermined angle α in this example (see FIG. 2). At this time, the tape take-up reel (3)
A slack in the tape (4) caused by the guide pins (7a) and (7b) moving in the unloading direction with a brake applied to the tape to prevent the tape (4) from being pulled out Is wound on the supply reel (2) by rotating it. Therefore, in this state, the tape (4) is guided between the reels (2) and (3) between the guide pins (8), (9), (7a), the tape guide drum (5) and the CT.
It is stretched around the L head (11) and the pinch roller (10b). In this case, in order to wind up the slack of the tape (4) by the supply reel (2), the supply reel (2)
Can be performed by rotating the tape in the tape rewinding direction by a motor (not shown), but it is composed of a plurality of gears between one of the rings (6a) or (6b) and the supply reel (2). A so-called gear train is interposed, and any meshing portion of the gear train is not meshed at all times, but meshes with each other only when the ring (6) is rotated in the unloading direction. It is also possible to rotate the supply reel (2) in the winding direction of the tape (4) along with the rotation of the 6) in the unloading direction. Since this means is well known, its detailed description is omitted. In the state shown in FIG. 2, point P is still
Located opposite the CTL head (11).

Next, hold the pad (20) of the brake device (12) and put the tape (4) between it and the tape guide drum (5).
The tape (4) is fixed so as not to slide on the drum (5) (the braking force by the brake device (12) in this case is the take-up reel (3) and the supply reel (2) of the tape (4). Since the difference in tension in each direction is about several tens of grams, a small one is sufficient.) After releasing the brakes on the take-up reel (3) side and the supply reel (2) side, open the ring (6). The recording state is again carried out, that is, the recording position described in FIG. 1 is loaded (see FIG. 3). As a result, the tape (4) is fed from the cassette around the fixed portion by the brake device (12) from the take-up reel (3) on the take-up side and from the supply reel (2) on the feed side, respectively. Moves a distance L in the rewinding direction of the tape (4). This so-called rewind amount L corresponds to the scanning angle α of the ring (6).

After that, the brake by the brake device (12) is released, and the system enters the standby state. Then, in accordance with the next recording operation (pressing the record button), the transfer of the tape (4) first starts in the reproducing state, the CTL signal on the tape (4), the rotary servo of the rotary magnetic head device, the capstan servo, and the After the phase relationship of the reference signal for recording is matched, the recording state is automatically switched. This switching is performed before the point P on the tape (4) passes through the CTL head (11). Thus, by continuing the recording, the preceding and following recording signals become continuous, and the image is not disturbed during reproduction.

In addition, after entering the pause state during recording, the ring (6)
Since the electric control circuit for unloading the angle α by the angle α, turning on the brake device (12), and setting the ring (6) in the recording state is not directly related to the gist of the present invention,
Detailed description thereof will be omitted.

It should be noted that the brake device (12) may be any brake device within the range in which the tape (4) is wound around the tape guide drum (5) in the state shown in FIG.

〔The invention's effect〕

According to the present invention described above, the tape (4) is wound around the fixing portion by the braking device (12) around the tape guide drum (5) when the recording operation is resumed from the pause or stop in the recording state. Since the take-up side is fed from the take-up reel (3) and the supply side is fed from the supply reel (2), the tape (4) can be used at any part from the top to the end.
By the so-called return amount (angle α in this example) of the ring (6) shown in FIG. 3, the finally required return amount (L in this example) of the tape (4) can be determined. In this case, it is possible to have a characteristic that there is almost no variation, in other words, a substantially reliable constant amount L of the return amount can be obtained.

In addition, when returning this tape, it has been considered that the number of CTL pulses is counted and returned by a fixed value. This is effective when a large amount of return is desired. An expensive circuit such as a number counting circuit is required, which is not preferable. However, according to the present invention, there is also a feature that a relatively large return amount L can be obtained simply by the mechanical deviation amount.

Furthermore, according to the present invention, a loading guide for loading the tape (4) onto the tape guide drum (5) is used for returning the tape (4) without any new mechanism. Therefore, there is a feature that there is no possibility of being expensive as a whole and there is no possibility of being mechanically complicated.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a recording state of the device according to the present invention, FIGS. 2 and 3 are partial plan views showing other states, and FIG. 4 is a side view showing an example of a braking device. It is a figure. (2) is a supply reel, (3) is a take-up reel, (4) is a magnetic tape, (5) is a tape guide drum, (6) is a tape loading guide, and (7a) and (7b) are guide pins. ,
(11) is a control head (CTL head), and (12) is a brake device.

Claims (1)

[Claims] 1. A tape loading guide for winding a magnetic tape around a tape guide drum of a rotary magnetic head device when a recording state is paused or when the recording state is stopped. A predetermined amount is moved in the unloading direction and a brake is applied to the winding side of the magnetic tape, and the slack of the magnetic tape caused by this is taken up on the supply side of the magnetic tape, and the magnetic tape is guided. After releasing the brake on the take-up side in a state where it is fixed by a brake device so as not to slide while being wound around the drum, the tape loading guide is again fed while feeding the magnetic tape from the take-up side and the supply side. By moving to the position of the recording state, the position of the magnetic tape on the tape guide drum is adjusted to the predetermined amount. Magnetic recording and reproducing apparatus being characterized in that the stagger the back by a length wound that response direction.