JPS60242541A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To perform clean picture reproduction and consecutive video recording by braking a capstan through a brake means and matching the phase of a rotary head with the phase of a control signal recorded on a tape. CONSTITUTION:One terminal part of a brake lever 14 which is rotatable around a support shaft 13 is fitted to the plunger 16 of a solenoid 15 and the lever 14 rotates clockwise against an energizing spring 18 when the solenoid 15 operates to brake a brake wheel 8. When the wheel 8 is braked, a frictionally coupled flywheel 1 and a capstan shaft 2 are also braked and a flat belt 6 moves over a slip. For the purpose, the control signal recorded on the tape is reproduced and its phase is compared by a comparing circuit with the phase of the rotary head; and the braking operation is released when both become in-phase, and consequently the relation between the tape and rotational position of the rotary head coincides with that in recording. Thus, clean picture reproduction and consecutive video recording are performed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a recording/reproducing device having a phase matching mechanism.
In particular, the present invention relates to a recording and reproducing apparatus having a phase matching mechanism suitable for video splicing.

BACKGROUND TECHNOLOGY AND PROBLEMS For example, in a video movie driven by a single motor, recording is achieved by precisely rotating a rotary head drum to lock the phase and feeding the tape at a predetermined speed. However, when playing back this, the relationship between the tape advance and the rotational position of the rotating head during playback must be matched to the relationship during recording, otherwise the rotating head will trace what is written on the tape. The phase with the object gets out of sync, making it impossible to reproduce a clear screen. For this adjustment, a signal indicating the rotational position of the rotating head is recorded on the tape as a control signal, but when the rotating head drum is rotating at a constant speed, the phase of the rotating head at this time ( If the phase of the control signal recorded on the tape during recording is not matched to the phase (indicating the rotational position of the rotating head), it will not be possible to reproduce the clear screen as described above.

The same can be said for splicing video to be newly recorded on an already recorded tape, and the phase of the control signal of the already recorded tape and the phase of the control signal of the newly recorded tape, that is, the above-mentioned If the phase of the rotating head does not match exactly, it will not be possible to take beautiful continuous shots.

Purpose of the Invention The present invention has been made in view of the above-mentioned circumstances, and its purpose is to control the phase of the control signal recorded on the tape and the phase of the rotary head of the rotary head drum by using a relatively simple braking means. It is an object of the present invention to provide a recording/reproducing device having a phase matching mechanism capable of matching the above.

SUMMARY OF THE INVENTION In order to achieve the above-mentioned objects, the present invention has a method in which a tape is passed from both reels to a predetermined tape running path via a rotary head drum having a rotary head and a capstan. In a recording/playback device that records and/or plays back a tape by rotationally driving the
A brake means is provided for applying a brake to the capstan, and a control signal recorded on the tape is reproduced, and this control signal is compared with the phase of the rotary head indicating the rotational position of the rotary head using a comparison means. The present invention has a phase matching mechanism in which the brake means applies a brake to the capstan so that the phase of the rotary head matches the phase of the tape control signal.

With the above configuration, it is possible to apply a brake to the capstan using a relatively simple brake means, thereby matching the phase of the rotary head with the phase of the control signal recorded on the tape.

EXAMPLE An example in which the present invention is applied to a video movie will be described below with reference to the drawings.

First, a first embodiment of the present invention using a mechanical friction brake will be described with reference to FIGS. 1 and 2. A capstan shaft 2 to which a flywheel 1 is fixedly attached is pivotally supported by a capstan bearing 4 on a mechanical chassis 3 and a subchassis 5. The flywheel 1 is rotationally driven via a flat belt 6 by a motor that rotationally drives a rotary head drum (not shown), and a brake wheel 8 is loosely fitted into a boss 7 of the flywheel 1 so as to be freely rotatable. The brake wheel 8 is connected to the flywheel by a felt 9 and a compression coil spring 10 interposed between the brake wheel 8 and the flywheel 1.
The compression spring 10 is interposed together with a spring holder 11 between a spring retainer 12 fixed at a predetermined position of the post 7 and the brake wheel 8.

On the other hand, the brake lever 1 is rotatable around the fulcrum shaft 13.
One end of the brake wheel 4 is attached to the plunger 16 of the solenoid 15, and the other end is provided with a brake shoe 17 made of rubber or the like that is press-fitted to the curved surface of the brake wheel 8. This brake lever 14 is normally biased to rotate counterclockwise in FIG. It is configured to brake the wheel 8.

Therefore, when braking is applied to the brake wheel 8, the flywheel 1, which is frictionally coupled with the brake wheel 8 and rotates integrally with it,
Braking is also applied to the capstan shaft 2, and the flat belt 6
moves while slipping. For this reason, the feeding of the tape is stopped, but since the rotary head drum (not shown) continues to rotate, the phase of the rotary head of the rotary head drum becomes out of phase. Therefore, the control signal recorded on the tape is reproduced by a control head (not shown) and compared with the phase of the rotary head by a comparator circuit.

If the brake is released when the two phases match, the relationship between the rotational positions of the tape and the rotary head will match the relationship during recording. Therefore, if playback or recording is performed in this state, it is possible to play back a beautiful screen or to take beautiful continuous shots.

Next, a second embodiment of the present invention using an electromagnetic brake will be described with reference to FIGS. 3 to 10.

Flywheel 1, capstan shaft 2, mechanical chassis 3
, the capstan bearing 4, the sub-chassis 5, the flat belt 6, the boss 7, etc., have the same or the same functions as those in the first embodiment, so they will be given the same reference numerals and their explanation will be omitted. do.

As shown in FIG. 4, the hissing plate 20 has a notch 21 formed on its outer periphery, and the notch 21 is inserted into the protrusion 22 on the inner periphery of the flywheel 1 to rotate it slightly in a predetermined direction. Then, the hissing plate 20 is attached so that it can rotate integrally with the flywheel 1 in a predetermined direction without coming off upward.

The magnetic path coupling 23 is made of pure iron or a similar iron-based material suitable for forming a magnetic path, and has an inner wall 24 and an outer wall 25.
The cross section is formed into an inverted U-shaped donut shape. A bobbin 27, around which an electromagnetic coil 26 is wound, is attached inside the bobbin 27 via a caulking portion 28. A pair of thick pin lands 29 are formed at predetermined positions on the bobbin 27, and terminal pins 30 are provided on the pin lands 29. The magnetic path coupling 23 is suspended from the insulated mechanical chassis 3 via screws 31, and maintains a predetermined gap with the hissing plate 20.

On the other hand, cutouts 32 and 33 are formed in the inner wall 24 and outer wall 25 of the magnetic path coupling 23 at equal intervals and facing each other in the radial direction t. Therefore, when the electromagnetic coil 26 is energized, the inner wall 24 is magnetized to the S pole, and the outer wall 25 is magnetized to the N pole, respectively, and the strength of the magnetization is distributed in the circumferential direction as shown in FIG. 9. Therefore, a magnetic path as shown in FIG. 10 is formed between the magnetic path coupling 23 on the fixed side and the hissing plate 20 on the rotating side, so the rotating hissing plate 20 is restricted. Power works. Therefore, this coordination can be performed.

In addition, in this second embodiment, since there is no contact, there is no wear and tear on parts, and the gradient of the rise and fall of the brake can be controlled arbitrarily, and the braking force can be freely selected. , the response speed is extremely fast, etc.
This embodiment has advantages not found in the other embodiments.

Next, a third embodiment of the present invention, which also uses an electromagnetic brake, will be described with reference to FIGS. 11 to 14. The third embodiment differs from the second embodiment only in the structure of the electromagnetic brake, so only this difference will be explained below.

The electromagnetic coil 3G wound around an iron core 35 as shown in FIG. 11 is in a state in which the iron core 35 passes through a hollow disk-shaped magnetic path coupling 37 and is fixed at equal intervals in the circumferential direction. in,
It is suspended from the magnetic path coupling 37. As shown in FIG. 12, the penetrating iron core 35 is arranged so as to be magnetized alternately into 8 poles and N poles, and the magnetic path coupling 3γ is the same as in the second embodiment. It is fixed to an insulated mechanical chassis 3. Therefore, the electromagnetic coil 36
When the magnetic path coupling 37 is energized, the state of magnetization of the magnetic path coupling 37 becomes as shown in FIG. The magnetic path shown in the figure is formed. Therefore, braking force is applied to the rotating capstan shaft in the same way as in the second embodiment.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, the capstan is braked by relatively simple braking means, thereby aligning the phase of the rotating head with the phase of the control signal recorded on the tape. This allows for beautiful screen playback and beautiful spliced shots.

Therefore, according to the present invention, the driving method and control method of the recording/reproducing device can be simplified.

[Brief explanation of drawings]

1 and 2 show a first embodiment of the present invention using a mechanical friction brake. FIG. 1 is a perspective view of the friction brake, FIG. 2 is a vertical sectional view of the capstan, and Figure 3~
Fig. 10 shows a second embodiment of the present invention using an electromagnetic brake, Fig. 3 is a longitudinal sectional view of the capstan, a sectional view taken along the line ■-■ in Fig. 5, and Fig. 4. is an exploded perspective view,
Fig. 5 is a top view of Fig. 3, Fig. 6 is a bottom view of Fig. 3, Fig. 7 is a sectional view taken along the line ■-■ of Fig. 5, and Figs. 8 to 10 are formed. Explanatory diagrams of the magnetic path, Figures 11 to 14 are the same (figures showing the third embodiment of the present invention using an electromagnetic brake, Figures 11 and 12 are perspective views of the electromagnetic coil and diagrams of the coil. A plan view showing the arrangement, FIGS. 13 and 14 are explanatory diagrams of the magnetic path formed, and FIG. 14 is a partially developed view developed in the circumferential direction. In addition, in the symbols used in the drawings, 2 ...... Capstan shaft 8...
...... Brake wheel (brake means) 14 ...... Brake lever (brake means) 15 ...... Solenoid (
Brake means) 17... Brake shoe (brake means) 20...
Hiss plates (braking means) 23, 37...
Magnetic path coupling (braking means) 26, 36...
... Electromagnetic coil (braking means) 35 ...
......It is an iron core (braking means). Agent Saturn Masaru Tsuneko Yoshi Man 4th Figure 3 Figure 7 Figure 9 Figure 11 Figure 12 Figure 13 Figure 1

Claims (1)

[Claims] The tape is passed from both reels to a predetermined tape running path via a rotary head drum having a rotary head and a capstan, and the rotary head drum and the capstan are rotationally driven to record and/or play back the tape. In the recording and reproducing apparatus, a brake means is provided for applying a brake to the capstan, and the control signal recorded on the tape is reproduced to read the control signal and the phase of the rotary head indicating the rotational position of the rotary head. and applying a brake to the capstan using the braking means until the two phases are matched by the comparison means, and
A recording/reproducing apparatus having a phase matching mechanism that matches the phase of the rotary head and the phase of the control signal of the tape.