JPH0814911B2 - Capstanless recording / playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is most suitable for application to, for example, a recording / reproducing apparatus of a digital data signal of a PCM (Pulse Code Modulation) system. The present invention relates to a recording / reproducing device of a capstanless (a tape is run at a constant speed without using a capstan).

[Outline of Invention]

According to the present invention, a pair of reels on which both ends of a tape are wound are mounted on a pair of reel bases, the tape is pulled out from the reel by a tape loading means and loaded into a recording / reproducing section, and the tape is loaded. In a recording / reproducing device for recording / reproducing by running a tape, a pair of tension regu- lators, at least one tape speed detector, one drive wheel for selectively driving both reel stands, and its drive wheel. By using one motor that drives the tape in forward and reverse directions, it becomes possible to record and reproduce the digital data signal by moving the tape in the forward direction and the reverse direction at a constant speed without using the capstan. The present invention relates to a small and thin recording / reproducing device.

[Conventional technology]

2. Description of the Related Art Conventionally, in an 8 mm video tape recorder, a pair of reels having both ends of the tape wound are mounted on a pair of reel bases, and the tape is pulled out from the reel by a tape loading means to form a recording / reproducing unit. A rotating head drum is loaded into an approximately M-shape, and the loaded tape is run at a constant speed by a single capstan or pinch roller system, and recording or reproducing is performed by the rotating head.

[Problems to be solved by the invention]

By the way, in recent years, there has been an increasing need for a particularly small recording / reproducing apparatus for recording and reproducing digital data signals such as digital audio signals and digital video signals.

Therefore, by utilizing the tape running system of the 8 mm video tape recorder described above, while the tape is running forward or reverse, a digital data signal is recorded or played back by the rotary head on the tape running forward or reverse. Conceivable. In this case, for example, the forward running and the reverse running are alternately performed, and recording is performed alternately in the width direction of the tape and in multiple channels.

However, in this case, the following problems occur.

(1). During reverse running, the tape tension on the peripheral surface of the rotating head drum changes according to the change in the winding diameter of the supply reel (usually, in a video tape recorder, a constant torque winding is used for winding the tape on the reel). Therefore, stable running of the tape on the peripheral surface of the rotating head drum and stability of hitting of the rotating head against the tape are difficult.

(2). In the configuration in which the tape is run at a constant speed by the single capstan or pinch roller system, generally, the stability point in the width direction of the tape changes between the forward run and the reverse run. Then, in order not to change the stable point in the width direction of the tape, it is necessary to increase the pressure force of the pinch roller against the capstan, which leads to an increase in size and complexity of the pinch roller pressure mechanism.

(3). When deciding the layout of the rotating head drum, reel stand, tape loading device, etc., the capstan flywheel and capstan drive motor are usually arranged on the back side of the chassis, and the recording / reproducing device cannot be made thin. .

From the above, when recording and reproducing digital data signals,
A conventional small-sized recording / reproducing apparatus such as an 8 mm video tape recorder cannot be used as it is.

In consideration of the above points, the present invention pays attention to the fact that some fluctuations in the tape running speed can be allowed because the signals to be recorded and reproduced are digital data signals. The digital data signal can be recorded or reproduced while the vehicle is running at a constant speed in the forward or reverse direction.

[Means for solving problems]

According to the present invention, a pair of reels on which both ends of a tape are wound are mounted on a pair of reel bases, the tape is pulled out from the reel by a tape loading means, and the tape is loaded into a recording / reproducing unit having a rotary head. In a recording / reproducing apparatus for running a tape and recording or reproducing by the rotary head, the rotary head is connected to the recording / reproducing unit and supplies a digital data signal for recording on the tape by the rotary head. Digital data signal processing means for receiving a digital data signal reproduced from the tape; a pair of tension regulators arranged between the reel bases and the recording / reproducing section to apply a predetermined tension to the tape; At least one of the tension regulators and the recording / reproducing And a tape speed detector for detecting the running speed of the tape, which is provided between the reel base and the reel base, and is selectively engaged with the reel bases to selectively rotate the reel bases. Drive wheel, one motor that drives the drive wheel in forward or reverse rotation, and rotation of the one motor is controlled based on the output of the tape speed detector during recording or reproduction of the digital data signal. Tape speed control means for controlling the running speed of the tape is provided, and by selectively rotating the both reel bases by the drive wheels that are normally or reversely driven by the motor, The tape is configured to run in the forward direction or the reverse direction, and at this time, the back tension of the tape is adjusted by the pair of tension regulators according to the running direction of the tape. The tape speed control means controls the motor to drive the tape at a constant speed, and the digital data is recorded by the recording / reproducing unit on the tape which is run in the forward direction or the reverse direction. A capstanless recording / reproducing apparatus configured to record or reproduce a signal.

[Action]

In the present invention, the tape is made to run forward or reverse by selectively rotating the pair of reel stands by the motor via the drive wheels. Moreover, at that time, while adjusting the tape back tension with a pair of tension regulators, the motor is controlled according to the tape speed detected by the tape speed detector, and the tape is removed without using a capstan. The digital data signal is recorded or reproduced while the vehicle is running at a constant speed in the forward or reverse direction.

〔Example〕

Examples of the present invention will be described below. Note that this embodiment is a compact, capstanless recording / reproducing apparatus in which a small tape cassette used for an 8 mm video tape recorder is used for audio and recording / reproducing of the PCM system is performed.

First, the embodiment shown in FIGS. 1 and 2 will be described.

First, when the small tape cassette 1 is mounted in the cassette mounting position, the pair of left and right reels 3 and 4 housed inside the magnetic tape (tape width of 8 mm) 2 are wound. It is mounted (engaged) on the pair of left and right reel stands 5, 6. Next, the magnetic tape 2 is pulled out of the tape cassette 1 from either reel 3 or 4 by a pair of left and right tape loading means 7 and 8 and loaded on the recording / reproducing section 9. The recording / reproducing unit 9 is composed of a rotary drum 11 having a plurality of recording / reproducing rotary heads 10. Although not shown, a recording signal formed by a separately provided digital data signal processing circuit. Is recorded on the magnetic tape 2 by the rotary head 10 for recording and reproducing, and the signal reproduced from the magnetic tape 2 by the rotary head 10 is supplied to the digital data signal processing circuit. The rotary drum 11 of the recording / reproducing unit is loaded in a substantially spiral shape on the peripheral surface of the rotary drum 11 at a predetermined spiral angle.

Next, a pair of left and right tension regulators 13 and 14 are provided on the supply side 2a and the winding side 2b of the magnetic tape 2 between the reel stands 5 and 6 and the rotary drum 11. Each of these tension regulators 13 and 14 has a tension arm 16 having a tension detection pin 15, and a tension spring 18 for biasing the tension arm 16 to rotate about a fulcrum shaft 17. It is configured by a reel stand brake 19 such as a band brake controlled by the tension arm 16.

Next, a pair of left and right tape speed detectors 21 and 22 are provided between the rotary drum 11 and both tension regulators 13 and 14 on the supply side 2a and the winding side 2b of the magnetic tape 2. In addition,
Each of these tape speed detectors 21 and 22 has a rotation guide 24 for guiding the magnetic tape 2 rotatably attached to the upper portion of a fixed tape height regulation table 23, and the rotation guide 24 has its upper end attached to the top.
The FG ring 25 is integrally provided, and the sensor 26 is provided close to the outer periphery of the FG ring 25. At this time, FG ring
In the case where a large number of teeth are formed on the outer circumference of 25, an optical sensor such as a photo coupler is used as the sensor 26, and magnetic poles (S and N are alternately arranged) are formed on the outer circumference of the FG ring 25. In this case, a magnetoresistive effect element or the like is used as the sensor 26. Then, in order to eliminate the slip of the magnetic tape 2 with respect to the rotation guide 24, the friction torque of the rotation guide 24 is reduced in order to match the tape speed and the FG frequency, and the diameter of the rotation guide 24 and the magnetic tape 2 are reduced.
Although the winding angle of the magnetic tape 2 is set, the magnetic tape 2 may be pressed against the rotation guide 24 by a pinch roller if necessary.

Next, between the reel stands 5 and 6, one drive wheel 29 and
There is provided one motor 30 for driving the drive wheel 29 in forward and reverse directions. In this case, the drive wheel 29 is rotatably supported by a link 32 configured to be swingable around the motor shaft 31 via a support shaft 33, and is fixed to the motor shaft 31 by a motor wheel 34. Always engaged. And the motor 30
While the drive wheel 29 is driven to rotate normally and reversely by the motor wheel 34 by the normal rotation drive and the reverse rotation drive, the outer circumference of the motor wheel 34 is rotated in the left-right direction by the swinging motion. The drive wheel 29 is configured to be selectively engaged with reel base wheels 35 and 36 provided on both reel bases 5 and 6 as shown by a solid line and a chain line in FIG. In this case, the drive wheel 29, the motor wheel 34, and the reel base wheels 35 and 36 are all configured by gears.

And each sensor of both tape speed detectors 21 and 22
The detection signal (tape speed information) from 26 is the sensor amplifier
It is configured to be supplied to the servo circuit 39 of the motor 30 through 38.

Next, the running drive of the magnetic tape 2 in the capstanless recording / reproducing apparatus configured as described above will be described.

First, in the forward running drive, the motor 30 is driven to rotate in the forward direction so that the drive wheel 29 is engaged with the reel base wheel 36 on the winding side as shown by the solid line in FIG. Is rotationally driven in the direction of arrow a.

By the rotational drive of the reel base 6 on the winding side, the magnetic tape 2 is forward run in the direction of arrow b in FIG. 1 so that the magnetic tape 2 is wound from the reel 3 on the supplying side to the reel 4 on the winding side.

At this time, the back tension of the magnetic tape 2 is automatically adjusted by the tension regulator 13 on the supply side. At this time, the tension arm 16 of the tension regulator 14 on the winding side is moved to the non-actuated position shown by the chain line in FIG. 1 by the tape tension and brought into contact with the stopper 41 to be locked. , The reel base brake 19 of the reel base 6 on the winding side is turned off.

Further, the tape speed information detected by the sensor 26 of the tape speed detector 22 on the winding side (which may be the tape speed detector 21 on the supply side) is supplied to the servo circuit 39 through the sensor amplifier 38. The servo circuit 39 controls the motor 30. That is, the servo circuit 39 controls the speed of the motor 30 so that the reel 4 on the winding side can wind the magnetic tape 2 at a constant speed.

As a result of the above, the magnetic tape 2 is always run in a constant tension state and a constant speed state (constant speed). Then, the magnetic tape 2 is recorded or reproduced by the rotating head 10 of the rotary drum 11 which is rotationally driven at the same time as the magnetic tape 2 is running forward. In this case,
At the time of recording, servo is applied to the motor 30 so that the FG frequency (tape speed information) detected by the sensor 26 of the tape speed detector 22 becomes a specified value. Also, during playback,
Phase (ATF) servo is applied in addition to the servo during recording.

Next, in the reverse traveling drive, the motor 30 is driven to rotate in the reverse direction so that the drive wheel 29 is engaged with the reel base wheel 35 on the supply side as shown by the chain line in FIG. Arrow c
It is performed by rotationally driving in the direction.

By this rotational drive of the reel table 5 on the supply side, the magnetic tape 2 is reversely run in the direction of arrow d in FIG. 1 so that the reel 4 on the winding side can be wound on the reel 3 on the supply side.

At that time, the back tension of the magnetic tape 2 is automatically adjusted by the tension regulator 14 on the winding side.
At this time, the tension arm 16 of the supply side tension regulator 13 is moved to the non-actuated position indicated by the chain line in FIG. 1 by the tape tension and brought into contact with the stopper 40 to be locked. The reel base brake 19 of the supply-side reel base 5 is turned off.

The tape speed information detected by the sensor 26 of the tape speed detector 21 on the supply side (may be the tape speed detector 22 on the winding side) is supplied to the servo circuit 39 through the sensor amplifier 38. The servo circuit 39 controls the motor 30 in the same manner as during the forward running drive.

As a result, the magnetic tape 2 is always reverse-traveled in a constant tension state and a constant speed state (constant speed) as in the case of the forward running drive. Recording or reproduction of the magnetic tape 2 is performed by the rotary head 10 of the rotary drum 11 which is rotationally driven simultaneously with the reverse running of the magnetic tape 2.

Next, FIG. 3 shows a modified example. In this case, the drive wheel 29 and the motor 30 are arranged in the space between the reel stands 5 and 6 and the rotary drum 11, and recording is performed. This is a compact playback device. In this case,
A pair of left and right intermediate wheels (gears) 43 and 44, which are constantly engaged with both reel base wheels 35 and 36, are adapted to selectively engage a driving wheel 29 that swings.

Although the embodiments of the present invention have been described above, the present invention is not limited to the embodiments, and various effective changes can be made based on the technical idea of the present invention.

For example, in the embodiment, a pair of tape speed detectors 21, 22
However, it is also possible to control the motor 30 by detecting the tape speed for both forward running and reverse running by a single tape speed detector.

〔The invention's effect〕

INDUSTRIAL APPLICABILITY The present invention does not require a capstan and a pinch roller to perform recording or reproduction of a digital data signal while moving the tape forward and backward at a constant speed without using a capstan, thereby reducing the size, weight and thickness. Thus, it is possible to realize a digital data signal recording / reproducing apparatus which has been reduced in cost and cost.

Also, by selectively engaging the drive wheels with the pair of reel stands,
Since the pair of reel bases is configured to be selectively driven, it is possible to drive the pair of reel bases by one motor, which means that the capstan and the pinch roller are unnecessary. As a result, the size and weight of the recording / reproducing apparatus for digital data signals can be greatly reduced.

Further, according to the present invention, while the tape back tension is alternately adjusted by the pair of tension regulators, the tape is directly driven by the pair of reels whose speed is controlled by the motor, and the forward running and Since the tape is run in reverse, the tape is stably run on the peripheral surface of the rotating drum and the stability of hitting the rotating head against the tape is very high. Despite this, it is possible to record and reproduce with a precision suitable for digital data signals.

Further, since the drive wheels driven by one motor are selectively engaged with the pair of reel bases to selectively drive the pair of reel bases, the pair of reel bases is Since the motor can be driven and the capstan and the pinch roller are not required, the recording / reproducing apparatus can be greatly reduced in size, weight and thickness.

Furthermore, since it is not necessary to detect the looseness of the tape, which is indispensable in the tape drive system using the capstan, the reel stand
FG can be omitted. The tape speed detector can also be used as a simple tape linear counter. Since the tape can be stably run on the peripheral surface of the rotating drum, the rotary head or the like does not hit the tape when switching between forward running and reverse running.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is an overall plan view, FIG. 2 is a perspective view of a part of FIG. 1, and FIG.
The figure is an overall plan view showing a modified example. In the reference numerals used in the drawings, 2 ... magnetic tape 3 ... reel 4 ... 〃 5 ...... reel stand 6 …… 〃 7 …… tape loading means 8 …… 〃 9 …… recording / reproducing unit 10…. … Rotating head 11 …… Rotating drum 13 …… Tension control 14 …… 〃21 …… Tape speed detector 22 …… 〃29 …… Drive wheel 30 …… Motor 39 …… Servo circuit.

Claims (1)

[Claims] 1. A pair of reels having both ends of the tape wound thereon are mounted on a pair of reel bases, the tape is pulled out from the reels by a tape loading means, and is loaded into a recording / reproducing section having a rotary head, and the loading is performed. A recording / reproducing apparatus for recording or reproducing the tape recorded by the rotary head by running the recorded tape, and supplying the digital data signal for recording on the tape by the rotary head, and the rotary head. A digital data signal processing means for receiving a digital data signal reproduced from the tape by means of a pair of tension regulators arranged between the reel base and the recording / reproducing section to apply a predetermined tension to the tape; At least one of a pair of tension regulators and the recording A tape speed detector for detecting the running speed of the tape, which is provided between the reel unit and the reel unit, and selectively engaged between the reel units by selectively engaging the reel units. A drive wheel that rotates, a motor that drives the drive wheel in a forward or reverse direction, and a rotation of the one motor based on the output of the tape speed detector during recording or reproduction of the digital data signal. And a tape speed control means for controlling the traveling speed of the tape by controlling the tape, and by selectively rotating the both reel stands by the drive wheels that are normally or reversely driven by the motor, The tape is configured to run in the forward direction or in the reverse direction, and at that time, the tape backing is performed by the pair of tension regulators according to the running direction of the tape. The tape speed control means controls the motor to drive the tape at a constant speed, and the digital data is recorded by the recording / reproducing unit on the tape running in the forward direction or the reverse direction. A capstan-less recording / reproducing apparatus characterized in that a signal is recorded or reproduced.