JPH0828014B2 - Recording and playback device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus having a phase adjusting mechanism, and more particularly to a recording / reproducing apparatus having a phase adjusting mechanism suitable for video continuous shooting.

Background Art and its Problems For example, in a video movie driven by a single motor, a rotary head drum is accurately rotated to lock the phase, and a tape is sent at a predetermined speed for recording. However, when playing this, if the relationship between the tape feed during playback and the rotational position of the rotary head must be matched to the relationship during recording, what was written on the tape and what the rotary head traces The phase of is out of order and a beautiful screen cannot be played. For this adjustment,
A signal indicating the rotating position of the rotating head is recorded on the tape as a control signal.When the rotating head drum is rotated at a constant speed, the phase of the rotating head at this time (indicating the rotating position of the rotating head is shown). If the phase of the control signal recorded on the tape at the time of recording is matched with (Phase), a beautiful screen cannot be reproduced as described above.

The same thing can be said for the continuous shooting of the video newly recorded on the already recorded tape, that is, 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 If the phase of the rotating head does not match exactly, you will not be able to take beautiful continuous shots.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a recording / reproducing apparatus in which a driving system and a control system are simplified by rotationally driving a rotary head and a capstan in common by one motor. , A capstan flywheel in which at least one of an upper surface and a lower surface of a capstan flywheel, which is concentrically and integrally coupled to the capstan and has a drive belt applied to its outer peripheral surface, is braked by a braking means. Provided is a recording / reproducing apparatus having a phase matching mechanism capable of matching the phase of a control signal recorded on a tape and the phase of a rotary head of a rotary head drum with a very simple structure of slipping on the outer peripheral surface of the rotary head. Especially.

SUMMARY OF THE INVENTION Recording and / or reproduction of a tape by winding a tape from both reels through a rotary head drum having a rotary head and a capstan to a predetermined tape traveling path and rotationally driving the rotary head and the capstan. In the recording / reproducing apparatus, a phase adjusting mechanism for adjusting the phase of the control signal recorded on the tape and the phase of the rotary head indicating the rotational position of the rotary head to each other is provided. A motor for rotationally driving the rotary head, a capstan flywheel concentrically and integrally connected to the capstan, and a capstan flywheel that is hung on the outer peripheral surface of the capstan flywheel and driven by the motor. Rotate the capstan via the capstan flywheel The capstan flywheel is provided with at least one of the upper surface (upper bottom surface) and the lower surface (lower bottom surface) of the capstan flywheel. And a braking means for applying a brake such as an electromagnetic brake to slip the belt against the outer peripheral surface of the capstan flywheel, and a control signal recorded on the tape to reproduce the phase of the control signal. Comparing means for comparing the phase of the rotary head, respectively, at least one of the upper surface and the lower surface of the capstan flywheel by the braking means until the phase of the control signal and the phase of the rotary head match each other. Control of the tape by braking on the It was constructed issue of the phase and of the rotary head phase so as to match one another.

With the above configuration, in the recording / reproducing apparatus in which the driving system and the control system are simplified by rotating the rotary head and the capstan in common by one motor, the recording / reproducing apparatus is concentrically and integrally formed with the capstan. At least one of the upper surface and the lower surface of the capstan flywheel, which is coupled to the outer peripheral surface of which the drive belt is hung, is braked by braking means to cause the drive belt to slip with respect to the outer peripheral surface of the capstan flywheel. With a simple configuration, the phase of the control signal recorded on the tape and the phase of the rotary head can be matched with each other.

Embodiment An embodiment 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 at a lower portion is pivotally supported by a capstan bearing 4 on a mechanical chassis 3 and a sub chassis 5. A flywheel, that is, a capstan flywheel 1 is rotatably driven by a motor rotatively driving a rotary head drum (not shown) via a flat belt 6, and a boss 7 of the flywheel 1 is rotatably driven by a brake wheel 8. It is fitted. The brake wheel 8 is frictionally coupled to the flywheel 1 by means of a felt 9 and a compression coil spring 10 which are interposed between the brake wheel 8 and the flywheel 1. The spring retainer 12 fixed at a predetermined position of the boss 7 and the brake wheel 8 are interposed.

On the other hand, a brake lever 14 that is rotatable around the fulcrum shaft 13
One end 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 pressed against the peripheral surface of the brake wheel 8. The brake lever 14 is normally urged to rotate in the counterclockwise direction in FIG. 1 by the return spring 18, but when the solenoid 15 is operated, the brake lever 14 is rotated in the clockwise direction against the urging spring 18. , Is configured to brake the brake wheel 8.

Accordingly, when the brake wheel 8 is braked, the flywheel 1 and the capstan shaft 2 that are integrally frictionally coupled with the brake wheel 8 are also braked, and the flat belt 6 moves while slipping. For this reason, the feeding of the tape is stopped, but the rotary head drum (not shown) continues to rotate, and the phase of the rotary head of the rotary head drum deviates. Accordingly, the control signal recorded on the tape is reproduced by the control head (not shown),
If the phase of the rotary head is compared with the comparison circuit and the brake is released when the phases of both phases match, the relationship between the tape and the rotational position of the rotary head matches the relationship during recording.
Therefore, if reproduction or recording is performed in this state, it is possible to reproduce a beautiful screen and to make a beautiful continuous shooting.

Next, a second embodiment of the present invention using an electromagnetic brake will be described with reference to FIGS. The flywheel 1, the capstan shaft 2, the mechanical chassis 3, the capstan bearing 4, the sub chassis 5, the flat belt 6 and the boss 7 have the same or the same functions as those in the first embodiment, and therefore, the same reference numerals are given to them. And its description is omitted.

As shown in FIG. 4, the hiss plate 20 has a notch on its outer periphery.
21 is formed, and this notch 21 is used for the flywheel 1
When it is inserted into the projection 22 on the inner circumference and slightly rotated in a predetermined direction, the hiss plate 20 is attached rotatably 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 is formed in a donut shape having an inner wall 24 and an outer wall 25 with an inverted U-shaped cross section. A bobbin 27, around which the electromagnetic coil 26 is wound, is attached to the inside of the bobbin 27 via a caulking portion 28. A pair of thick-walled 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 with screws 31, and the hiss plate
Keeping a certain gear gap between 20 and.

On the other hand, on the inner wall 24 and the outer wall 25 of the magnetic path coupling 23,
Notches 32 at equal intervals and facing each other in the radial direction,
33 is formed in the shape of an incisor. Therefore, when the electromagnetic coil 26 is energized, for example, the inner wall 24 is magnetized to the S pole and the outer wall 25 is magnetized to the N pole, and the intensity of the magnetization is distributed in the circumferential direction as shown in FIG. Therefore, the magnetic path coupling on the fixed side
Since a magnetic path as shown in FIG. 10 is formed between 23 and the his plate 20 on the rotating side, a braking force acts on the rotating his plate 20. Therefore, the capstan shaft 2 can be braked in this way to perform the phase matching.

In the second embodiment, since there is no contact, there is no consumption of parts, the rising and falling gradients of the brake can be controlled arbitrarily, and the braking force can be freely selected. In addition, it has advantages that the first embodiment does not have, such as extremely fast response speed.

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

An electromagnetic coil 36 wound around an iron core 35 as shown in FIG.
Is suspended from the magnetic path cup ring 37 in a state where the iron core 35 passes through the magnetic path cup ring 37 having a hollow disk shape and is fixed at equal intervals in the circumferential direction. As shown in FIG. 12, the penetrating iron cores 35 are arranged so as to be alternately magnetized into S poles and N poles, and the magnetic path coupling 37 is insulated as in the second embodiment. It is fixed to the mechanical chassis 3. Accordingly, when the electromagnetic coil 36 is energized, the state of magnetization of the magnetic path coupling 37 becomes as shown in FIG. 13, and as a result, the magnetic path coupling 37 and the iron core 35 fixed between the rotating hiss plate 20 are provided. , The magnetic path shown in FIG. 14 is formed. Therefore, the braking force acts on the rotating capstan shaft in the same manner as in the second embodiment.

As described above, according to the present invention, at least one of the upper surface and the lower surface of the capstan flywheel, which is concentrically and integrally connected to the capstan, is braked by the braking means to form the belt. By slipping on the outer peripheral surface of the capstan flywheel, the phase of the control signal recorded on the tape and the phase of the rotary head can be matched with each other, so that a beautiful screen reproduction and beautiful continuous shooting can be achieved. It is possible.

Further, the rotary head and the capstan are configured to be commonly driven and rotated by one motor, and the motor is hung on the outer peripheral surface of a capstan flywheel concentrically and integrally connected to the capstan. The driven belt rotationally drives the capstan via the capstan flywheel and is concentrically and integrally coupled to the capstan. At least one of the lower surfaces is directly braked by braking means so that the belt slips with respect to the outer peripheral surface of the capstan flywheel. Therefore, since the outer peripheral surface and at least one of the upper surface and the lower surface of the capstan flywheel, which generally has a large diameter and a small height, can be utilized extremely effectively, it is possible to reproduce a beautiful screen and to make a clean joint. Despite being able to take pictures, the braking force of the braking means can be used very efficiently, and both the drive system and control system of the recording / reproducing apparatus can be simplified. When the present invention is applied to a portable VTR such as a video movie, it is a very practical portable that is small, lightweight, inexpensive, and consumes less power.
VTR can be provided.

[Brief description 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 longitudinal sectional view of a capstan, and FIG. Figure ~
FIG. 10 shows a second embodiment of the present invention using an electromagnetic brake. FIG. 3 is a longitudinal sectional view of the capstan, which is a sectional view taken along the line III-III in FIG. 5, and FIG. The same exploded perspective view,
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 VII-VII of FIG. 5, and FIGS. 8 to 10 are formed. FIG. 11 to FIG. 14 are views showing a magnetic path, and FIG. 11 to FIG. 14 are views showing a third embodiment of the present invention which also uses an electromagnetic brake, and FIGS. 11 and 12 are perspective views of electromagnetic coils and arrangement of coils. 13 is a plan view showing a magnetic path to be formed, and FIG. 14 is a partially developed view developed in the circumferential direction. In the reference numerals 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 plate (braking means) 23,37 …… Magnetic path coupling (braking means) 26,36 …… Electromagnetic coil (braking means) 35 …… Iron core (braking means).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takao Kumagai 6-735 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (56) Bibliography 57-184323 51-41328 (JP, B1) JP-B-55-51257 (JP, B2)

Claims (1)

[Claims] 1. Recording and / or recording of a tape by winding a tape from both reels through a rotary head drum having a rotary head and a capstan to a predetermined tape running path, and rotationally driving the rotary head and the capstan. Alternatively, in a recording / reproducing apparatus which is configured to perform reproduction, and which is provided with a phase adjusting mechanism for adjusting the phase of the control signal recorded on the tape and the phase of the rotary head indicating the rotational position of the rotary head to each other. A motor for rotating the rotary head, a capstan flywheel concentrically and integrally coupled to the capstan, and a motor driven by being hung on an outer peripheral surface of the capstan flywheel. Drives the capstan via the capstan flywheel And a belt for slipping the belt against the outer peripheral surface of the capstan flywheel by braking at least one of the upper surface and the lower surface of the capstan flywheel. Means and a comparing means for reproducing the control signal recorded on the tape and comparing the phase of the control signal with the phase of the rotary head, and the phase of the control signal and the phase of the rotary head. Until the two are aligned with each other, the braking means applies a brake to at least one of the upper surface and the lower surface of the capstan flywheel, thereby recording the phase of the control signal of the tape and the phase of the rotary head with each other. Playback device.