JPH09251688A - Information recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the damage on a recording surface at the time of running by jetting a pressurized fluid to an information medium when the speed after the running of the information medium is started is lower than a prescribed speed, or in a certain time after the running of the information medium is started. SOLUTION: The control timing of a changeover valve 10 for forwarding the pressurized fluid generated by a pump 9 to an information recording/ reproducing head 3 is decided in a digital controller 20. When the mode is a tape running mode, the running speed of the information medium is detected by using the output of a tachometer. When the relation between the running speed V of the information medium and a certain speed Vp is V<Vp, the signal for supplying the pressurized fluid to the head 3 is transmitted to the changeover valve 10. By this procedure, the information medium 1 is floated from the head 3, thereby the running performance with a little influence of running friction is obtained, and the damage on the recording surface of the information medium 1 is drastically suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape device,
An information recording / reproducing apparatus using a web-shaped information medium such as an optical tape or a magneto-optical tape, and particularly suitable for preventing the traveling performance from deteriorating in a frictional traveling system and preventing the information medium from sticking to a recording / reproducing head. It is an information recording / reproducing apparatus.

[0002]

2. Description of the Related Art An information recording / reproducing apparatus for recording / reproducing a signal on / from a tape has been used as a backup apparatus for a magnetic disk for computer data recording, which has become extremely large in capacity in recent years.

Usually, the working surface of the recording / reproducing head and the recording surface of the information medium are sufficiently polished to prevent wear and improve the output electric signal. Therefore, when the information medium is stopped, the recording surface of the information medium sticks to the working surface of the recording / reproducing head, and when the information medium travels from the stuck state, the recording surface of the tape is damaged. May occur.

As a countermeasure against this, there is a means for spraying the pressurized fluid onto the information medium which is stopped so that the information medium floats above the working surface of the recording / reproducing head in a tent shape. It is described in JP-A-58-199427, which is widely used in general information recording / reproducing devices.

Further, the recording / reproducing head may be worn due to friction during traveling.

As a countermeasure against this, the pressurized fluid is sprayed onto the information medium for a certain time after the traveling of the information medium to levitate the information medium above the recording / reproducing head. Means for levitating by the relative speed of the recording / reproducing head and the information medium is disclosed in JP-A-61-19205.
No. 9 is described.

[0007]

In recent years, downsizing is rapidly progressing in the computer market, and there is a demand for downsizing and cost reduction of an information recording / reproducing apparatus as well.

In order to reduce the size and cost of the device, it is necessary to save space and reduce the number of parts used, but reliability, functionality, and basic specifications are equivalent to those of the conventional one. Securing is essential.

FIG. 6 shows an information medium traveling system of a conventional general information recording / reproducing apparatus, and FIG. 7 shows a tape traveling system of an information recording / reproducing apparatus according to the present invention which is miniaturized.

In FIG. 5, the air D bearing 31, tape buffer 32, and tension sensor 33 used in FIG. 4 are eliminated, and a tape guide 34 is used instead. As a result, the air supply amount of the pump used for air supply is reduced as compared with the conventional one, and a small-sized and low-priced pump can be used.

Further, the motor is downsized by increasing the start / stop time and reducing the transfer acceleration of the information medium.

However, in the case of an apparatus which does not use the air D bearing or tape buffer used for reducing the friction between the traveling system and the information medium, the following problems occur.

In the spraying means, since the information medium is in contact with the peripheral portion of the recording / reproducing head, the recording surface of the information medium may be different from the recording / reproducing head depending on the condition of the information medium and the use environment of the apparatus. There is a case where it strongly sticks to the action surface, and it was not possible to completely prevent damage to the recording surface of the information medium at the start of running.

Further, in the conventional apparatus, the controller issues an instruction to end the spraying of the pressurized fluid at the time of startup, and the spraying of the pressurized fluid is continued for a minute time with a mechanical time delay. Alternatively, the method of spraying the pressurized fluid for a certain period after the start of running does not consider the running speed of the information medium.

Therefore, when the start-up time is delayed, the spraying of the pressurized fluid is completed before the traveling speed of the information medium reaches a sufficient speed that is not affected by friction, which adversely affects the traveling performance. There was a problem to give.

[0016]

[Table 1]

[0017]

In order to solve the above problems, in an information recording / reproducing apparatus according to the present invention, a pressurized fluid is applied to an information medium at a certain speed or less after the information medium is started after the apparatus is started. It is equipped with a spraying means.

Further, another information recording / reproducing apparatus according to the present invention is provided with means for obtaining an arrival time to a certain speed after the information medium starts running and spraying a pressurized fluid onto the information medium until the arrival time. is there.

Further, another information recording / reproducing apparatus according to the present invention is provided with means for weakening the tension of the information medium on the recording / reproducing head at a certain speed or less after the start of traveling of the information medium as compared with the steady traveling. is there.

Further, in another information recording / reproducing apparatus according to the present invention, the arrival time to a certain speed after the start of traveling of the information medium is obtained, the arrival time to the certain speed after the start of traveling of the information medium is obtained, and the arrival time is reached. A means for weakening the tension of the information medium on the recording / reproducing head with respect to the steady running is provided.

Even when the start-up time is delayed in the small-sized information recording / reproducing apparatus, the pressurized fluid is sprayed until the traveling speed of the information medium reaches a sufficient speed that is not affected by friction. It is possible to obtain excellent running performance.

Also, in the tape running system in which the air D bearing and the tape buffer are eliminated, the damage of the recording surface of the information medium at the start of running of the information medium can be largely suppressed by spraying the pressurized fluid onto the information medium. be able to.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail. FIG. 1 is a block diagram of an embodiment of the present invention, FIG.
FIG. 3 is an operation flow chart of the embodiment of FIG.

In FIG. 1, an information medium 1 is unwound from a supply reel 2 and wound around a take-up reel 4 via an information recording / reproducing head 3. Supply reel 2 is drive motor 5
Thus, the take-up reel 4 is driven by the drive motor 6 to phase the information medium 1 from the supply reel 2 to the take-up reel 4 or from the take-up reel 4 to the supply reel 2 at a predetermined speed, thereby recording information. The reproducing head 3 records or reproduces a signal on the information medium 1. A tachometer 7 is attached to the drive motor 5, which detects the rotation amount of the supply reel 2 directly connected to the drive motor 5 and generates a number of pulses proportional to the rotation amount of the supply reel 2. Similarly, a tachometer 8 is attached to the drive motor 6, which detects the rotation amount of the take-up reel 4 directly connected to the drive motor 6 and outputs a number of output pulses proportional to the rotation amount of the take-up reel 4. To do. Since the number of pulses from the tachometer within these fixed time intervals is directly proportional to the angular velocity of the reel, the velocity of the information medium 1 at the positions of the supply reel 2 and the take-up reel 4 can be calculated.

The drive motors 5 and 6 are driven by the drive currents output from the power amplifiers 15 and 16 which are constant current amplifiers, respectively. On the other hand, the inputs of the power amplifiers 15 and 16 are the outputs of the DA converters 17 and 18. DA converter 1
7 and 18 are output ports 2 of the digital controller 20.
The motor current command value output from 2 is input, and this is converted to analog and output.

The information recording / reproducing head 3 has a pressurized fluid outlet (not shown). The pump 9 generates a pressurized fluid to be sprayed on the information medium 1. By the switching valve 10, the pressurized fluid generated by the pump 9 is sent to the lifter pipe 11 for supplying the pressurized fluid to the information recording / reproducing head 3 or the discharge pipe 12 for discharging the pressurized fluid to the atmosphere. decide.

The supply pressure of the pressurized fluid is such that the running resistance is constant and the running performance is stable.

The digital controller 20 controls the motors 5 and 6 and the switching valve 10.

The input port 23 inputs the pulses generated by the tachometers 7 and 8 and sends them to the calculator 21. Calculator 2
Reference numeral 1 has a function of controlling the entire digital controller 20.

That is, by driving the drive motors 5 and 6,
The supply reel 2 and the take-up reel 4 are rotated, and a motor current command value for controlling the speed and tension of the information medium 1 when passing through the information recording / reproducing head 3 to predetermined target values is determined and output. Port 22 to DA converter 17,
Output to 18.

Similarly, the ON / OFF signal of the switching valve 10 for sending the pressurized fluid generated by the pump 9 to the information recording / reproducing head 3 is determined at a predetermined timing and is output from the output port 22.

The computing unit 21 calculates the control variables and constants necessary for determining the motor current command value, using the input port 2
Calculation is performed using a combination of several state quantity measurement values sent from the device 3 and a mechanism characteristic constant stored in advance in a ROM (Read Only Memory) 25. Then, the control parameters, which are the outputs thereof, are transferred to a RAM (Random Acces Mem) at an appropriate time timing.
ory) 24 updates the feed control variables and constants.

Next, the operation of FIG. 1 will be described with reference to FIG.
FIG. 2 is an operation flow chart for determining the control timing of the switching valve 10 for sending the pressurized fluid generated by the pump 9 to the information recording / reproducing head 3 in the digital controller 20, at predetermined sample times. To be executed.

First, the process of step F10 is performed. In step F10, it is determined whether the tape is in the running mode.

If it is not the tape running mode, step F5
0 is executed and a signal for supplying a pressurized fluid to the information recording / reproducing head 3 is sent to the switching valve 10.

In the tape running mode, step F20
Then, the traveling speed of the information medium is detected using the tachometer output described above.

In step F30, the traveling speed V of the information medium is a certain speed Vp (for example, a target traveling speed of 2 m / s is 80 m / s).
%) Is determined.

If V> Vp, step F40 is executed and a signal for discharging the pressurized fluid into the atmosphere is supplied to the switching valve 1.
Send to 0.

If not, step F50 is executed and a signal for supplying the pressurized fluid to the information recording / reproducing head 3 is sent to the switching valve 10.

As a result, the information medium 1 is levitated from the information recording / reproducing head 3 so that it is possible to obtain a running performance less affected by running friction, and it is possible to significantly suppress damage to the recording surface of the information medium.

In the above embodiment, the signal is supplied to the switching valve 10 at the traveling speed of the information medium, but it may be supplied at the elapsed time from the start of traveling of the information medium 1.

FIG. 3 is another operation flow chart for determining the control timing of the switching valve 10 for sending the pressurized fluid generated by the pump 9 to the information recording / reproducing head 3 in the present invention. 3 is different from FIG. 2 in that it is determined by the traveling speed of the information medium 1, but is determined by the elapsed time from the start of traveling of the information medium 1. The different processing between FIG. 2 and FIG. 3 will be described below.

In the tape running mode, step F12
0 is executed to calculate the elapsed time T from the start of traveling of the information medium 1.

In step F130, it is determined whether or not the elapsed time T has reached a certain time Tp (for example, 80% of 100 msec, which is the time required to reach the target traveling speed).

If T> Tp, step F40 is executed and a signal for discharging the pressurized fluid into the atmosphere is sent to the switching valve 10.

If not, step F50 is executed and a signal for supplying the pressurized fluid to the information recording / reproducing head 3 is sent to the switching valve 10.

In FIG. 4, in the present invention, the control timing of the switching valve 10 for sending the pressurized fluid generated by the pump 9 to the information recording / reproducing head 3 is determined, and the tension of the information medium is further adjusted when the pressurized fluid is sprayed. It is an operation | movement flow diagram which added weakening with respect to the time of a steady running state. FIG. 4 differs from FIG. 2 in that tension is set depending on whether or not a pressurized fluid is sprayed. The different processing between FIG. 2 and FIG. 4 will be described below.

After the execution of step F40, the tension during steady running is set in step 60.

After the execution of step F50, a tension weaker than the tension set in step 60 is set in step 70 to facilitate the information medium 1 to float above the information recording / reproducing head 3.

Further, similarly to the operation flow chart of FIG. 3 with respect to FIG. 2, the supply of the signal to the switching valve 10 in FIG. 4 may be performed at the elapsed time from the start of traveling of the information medium 1.

In the present invention, the control timing of the switching valve 10 for sending the pressurized fluid generated by the pump 9 to the information recording / reproducing head 3 is determined in the present invention, and the tension of the information medium is further adjusted when the pressurized fluid is sprayed. It is another operation | movement flowchart which added weakening with respect to the time of a steady running state.

[0052]

EFFECTS OF THE INVENTION Recording of the information medium at the start of traveling of the information medium by spraying a pressurized fluid onto the information medium for a certain speed or less after the traveling of the information medium or for a certain time after the start of traveling of the information medium The surface damage can be suppressed significantly.

When the startup time is delayed,
Since the pressurized fluid is sprayed until the traveling speed of the information medium reaches a sufficient speed that is not affected by friction, it is possible to obtain the same traveling performance as before even in a device that has been downsized and reduced in price. it can.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an information recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is an operation flow chart of the embodiment of FIG.

FIG. 3 is another operational flowchart of the embodiment of FIG.

FIG. 4 is another operational flowchart of the embodiment of FIG.

5 is another operational flowchart of the embodiment in FIG. 1. FIG.

FIG. 6 shows an information medium running system of a conventional information recording / reproducing apparatus.

FIG. 7 is an information medium traveling system of the information recording / reproducing apparatus according to the present invention, which is miniaturized.

[Explanation of symbols]

1 ... Information medium, 2 ... Supply reel, 3 ... Information recording / reproducing head, 4 ... Take-up reel, 5, 6 ... Drive motor, 7, 8 ... Tachometer, 9 ... Pump,
10 ... Switching valve, 11 ... Lifter pipe, 12 ... Discharge pipe, 20 ... Digital controller, 21
... arithmetic unit, 22 ... output port, 23 ... input port, 24 ... random access memory (RAM),
25 ... Read Only Memory (ROM),
31 ... Air D bearing, 32 ... Tape buffer, 33
… Tension sensor, 34… Tape guide.

Claims (6)

[Claims] 1. A recording / reproducing head for recording / reproducing a signal is used to record / reproduce information on / from the information medium by running a web-shaped information medium on the recording / reproducing head. In an information recording / reproducing apparatus having a mechanism for spraying, when the information medium is in a stopped state and the traveling speed of the information medium is not higher than a certain speed, a means for spraying a pressurized fluid on the information medium is provided. Information recording / reproducing apparatus. 2. A recording / reproducing head for recording / reproducing a signal is used, and a web-shaped information medium runs on the recording / reproducing head to record / reproduce information on / from the information medium. In an information recording / reproducing apparatus having a mechanism for spraying, a means for spraying a pressurized fluid onto the information medium until the arrival time is obtained, in which the arrival time to the information medium in a stopped state and a traveling speed of the information medium is reached. An information recording / reproducing apparatus characterized by comprising: 3. A recording / reproducing head for recording / reproducing a signal is used, and a web-shaped information medium travels on the recording / reproducing head to record / reproduce information on / from the information medium. An information recording / reproducing apparatus having a mechanism for spraying the information recording / reproducing apparatus, comprising means for spraying a pressurized fluid onto the information medium when recording and reproducing are not performed on the information medium. 4. A recording / reproducing head for recording / reproducing a signal is used, and a web-shaped information medium runs on the recording / reproducing head to record / reproduce information on / from the information medium. In an information recording / reproducing apparatus having a mechanism for spraying, when the information medium is in a stopped state and the traveling speed of the information medium is a certain speed or less, a pressurized fluid is sprayed on the information medium,
An information recording / reproducing apparatus comprising means for weakening the tension of the information medium on the recording / reproducing head during steady running. 5. A recording / reproducing head for recording / reproducing a signal is used, and a web-shaped information medium travels on the recording / reproducing head to record / reproduce information on / from the information medium. In an information recording / reproducing apparatus having a mechanism for spraying, the information medium is in a stopped state and the arrival time to a certain speed of the traveling speed of the information medium is obtained, and a pressurized fluid is sprayed onto the information medium until the arrival time, An information recording / reproducing apparatus comprising means for weakening the tension of the information medium on the recording / reproducing head during steady running. 6. A recording / reproducing head for recording / reproducing a signal is used to record / reproduce information on / from the information medium by running a web-shaped information medium on the recording / reproducing head, and pressurizing fluid on the information medium. In an information recording / reproducing apparatus having a mechanism for spraying, a pressurized fluid is sprayed on the information medium when recording and reproducing are not performed on the information medium, and the tension of the information medium on the recording / reproducing head is kept constant. An information recording / reproducing apparatus characterized in that it is provided with means for weakening it during running.