JPH0676419A - Method for adjusting constant speed tape traveling servo system in recording or reproducing device and tape cassette for adjustment - Google Patents

Abstract

PURPOSE:To easily make rapid and accurate adjustment possible by regenerating the cassette for adjustment recorded with a prescribed fixed frequency signal, measuring a frequency of a regenerative output obtained from a magnetic head and adjusting it to coincide with the prescribed frequency. CONSTITUTION:The tape cassette for adjustment wound with a magnetic tape having a short length of approximately 30sec recorded with the prescribed fixed frequency signal is loaded into the device, and the tape is traveled at a rated speed by the servo system. Then, the frequency of the regenerative signal from the tape cassette for adjustment is measured by a frequency counter FC. Subsequently, a deviation amt. between the measured regenerative frequency and the prescribed frequency is calculated, and when the deviation amt. is more than a prescribed value, a semifixed resistor RV is adjusted to make the deviation amt. less than the prescribed value. By this adjusting operation, a range of the number of revolutions of a motor is adjusted at a proper value. Consequently, the need of management of a tape position of the tape cassette for adjustment is eliminated, and rapid and accurate measurement can thus be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for a tape-shaped recording medium, and more particularly to a so-called reel drive type recording / reproducing apparatus for controlling a reel rotation speed to run the tape-shaped recording medium at a constant speed. is there.

[0002]

2. Description of the Related Art For example, a recording or reproducing apparatus using a magnetic tape housed in a tape cassette housing as a recording medium is widely used. In these recording or reproducing apparatuses, a capstan and a pinch roller are usually pressed against the magnetic tape. Then, the magnetic tape is run at a constant speed by controlling the rotation speed of the capstan at a constant speed. A reel drive system is also known in which the capstan and the pinch roller are omitted and the reel itself around which the magnetic tape is wound is driven to rotate at a constant speed.

[0003]

In the reel drive system, when the take-up reel (the reel shaft meshing with the take-up reel) is rotationally driven at a constant speed, the tape winding diameter on the reel gradually changes. As a result, the tape running speed changes. For example, depending on the tape length, the tape running speed at the tape top and the tape running speed at the tape end may change twice or more.

Therefore, even if the same recording medium is used, compatibility cannot be obtained between the reel drive type recording / reproducing apparatus and the capstan type recording / reproducing apparatus which is widely used at present. The reel drive method is not suitable as a recording / reproducing apparatus that requires fidelity in sound quality because the frequency characteristics and the S / N change from the tape top to the tape end due to changes in the tape running speed. . For these reasons, the reel drive type recording / reproducing apparatus has a problem that it is not practical although it has an advantage that the apparatus configuration is simplified by capstanless.

Therefore, in order to realize the constant speed running of the tape in the reel drive system, it is conceivable to adopt the servo system in which the tape running speed is detected and the reel motor rotational speed is variably controlled accordingly. In this case, the tape running speed information is obtained by, for example, a rotary encoder having a roller that is pressed against the tape and rotates as the tape runs. For example, the rotation cycle of the roller is measured and used as tape running speed information. Then, an error signal is obtained according to the difference between the detected tape running speed information and a predetermined speed of tape constant speed running, and a reel motor drive voltage corresponding to the error signal is generated to variably control the motor rotation speed. That is, the number of rotations of the reel motor is gradually reduced from the tape top to the tape end.

By the way, in order to realize accurate traveling speed servo, the variable range (N _{MAX to} N _MIN ) of the motor rotation speed in the reel motor must be appropriately adjusted with respect to the servo control range. For example, in the case of a device compatible with a compact cassette tape, the number of rotations of the motor differs between the tape top and the tape end by nearly twice, and the range of the error signal that is the servo control value is finite.
There is an optimum range as the variable range of the motor rotation speed. And if this motor rotation speed range is inappropriate,
The proper constant speed running servo will not be performed.

Since the variable range of the motor rotational speed can be adjusted by shifting a semi-fixed resistance inserted in a motor drive system circuit, for example, while the reproducing operation is usually performed by the adjusting tape cassette, for example, the tape top. It was adjusted so that the number of revolutions N _MAX could be obtained.

However, for example, in a normal adjusting tape cassette for 30 minutes of one-sided running, management of the tape running position is complicated, and there is a problem that the adjustment process becomes inefficient. For example, in order to make an adjustment with the tape top as a reference, it is necessary to make the change in the tape winding diameter of the take-up side reel substantially constant so as not to hinder the adjustment.
It is necessary to repeat the operation of playing back for a short time of about 0 seconds and then rewinding and playing again.

[0009]

In view of the above problems, the present invention provides a motor suitable for a reel drive type recording or reproducing apparatus which records / reproduces by moving a tape-shaped recording medium at a constant speed. An object of the present invention is to provide a method of adjusting the rotation speed range and a tape cassette for adjustment.

That is, the reel is rotationally driven with respect to the tape-shaped recording medium wound around the reel to execute the traveling operation of the tape-shaped recording medium, and the variable range of the rotational speed of the motor for rotationally driving the reel is adjusted. Reel drive means having an adjusting section, tape running speed detecting means for detecting tape running speed information of the tape-shaped recording medium, and a servo control value for a predetermined running speed of the tape-shaped recording medium is calculated based on the tape running speed information. Servo information capable of controlling the number of rotations of the motor in the reel drive means so that the traveling speed of the tape-shaped recording medium becomes a predetermined traveling speed, and information is provided to the tape-shaped recording medium traveling at a predetermined speed. For the recording or reproducing device for performing the recording or reproducing operation of the tape, first, from the tape top of the running position of the tape-shaped recording medium to the tape The tape length is short enough that the winding diameter of the take-up reel does not fluctuate and the adjustment tape cassette on which a predetermined constant frequency signal is recorded is loaded for playback, and then the adjustment tape cassette. The frequency of the reproduction output obtained from the magnetic head while the tape-shaped recording medium is running is measured by a frequency counter. Then, the adjusting section in the reel drive means is adjusted so that the frequency measured by the frequency counter becomes the predetermined frequency recorded on the tape-shaped recording medium in the adjusting tape cassette. The tape constant speed servo system, specifically, the variable range of the motor rotation speed is adjusted by the above procedure.

Further, regarding the recording or reproducing apparatus having fixed value generation means capable of cutting off the supply of the servo control value from the servo means to the reel drive means and supplying the set fixed servo control value, First, after the servo control value from the fixed value generation means is supplied to the reel drive means, the variable range of the motor rotation speed is adjusted in the same manner as above.

As the adjusting tape cassette, the tape length is short so that the winding diameter of the take-up reel does not substantially change from the tape top at the running position of the tape-shaped recording medium to the tape end. It is assumed that a predetermined constant frequency signal is recorded.

[0013]

In the adjusting method executed by using the adjusting tape cassette, it is possible to adjust the motor rotation speed range very efficiently because it is not necessary to manage the tape running position.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tape constant speed running servo system in a reel drive system will be described below, and then an embodiment of an adjusting method for a tape constant speed running servo system and an adjusting tape cassette of the present invention will be described.

First, the tape constant speed running servo system will be described with reference to FIGS. 1 and 3 to 6. In FIG. 1, reference numeral 1 denotes a magnetic tape wound and accommodated on a supply reel 2 and a take-up reel 3 in a tape cassette, and the magnetic head 10 is loaded by the recording or reproducing apparatus of the embodiment and run. By this, recording / reproducing operation of voice information and the like is performed.

The running of the magnetic tape 1 is performed by driving the take-up reel 3 by the reel motor 11. That is, as shown in FIG. 3, the rotational force of the reel motor 11 is transmitted to the flywheel 13 by the belt 12, and the drive shaft 14 provided on the flywheel 13 rotates. A take-up reel stand 15 is pressed against the drive shaft 14 via a rubber belt 16 on its peripheral surface, and the take-up reel stand 15 is rotated by the rotation of the drive shaft 14, and the reel mounted on the take-up reel stand 15 is rotated. The drive shaft 17 rotates.

When the tape cassette 4 is loaded as shown by the alternate long and short dash line, the hub of the take-up reel 3 meshes with the reel drive shaft 17 so that the hub rotates and the magnetic tape 1 runs. Reference numeral 18 denotes a reel shaft for the supply reel 2.

Reference numeral 12 in FIGS. 1 and 3 denotes a rotary encoder provided for detecting the tape running speed, and includes a roller 12a, a shield plate 12b provided on the roller 12a, and a photodiode 12 as a light output section.
c, a phototransistor 12d for detecting an optical output from the photodiode 12c and converting it into an electric signal.

The structure of the rotary encoder 12 is shown in FIG.
As shown in (a), the roller 12a is connected to the frame 12
The photoreflector 1 is rotatably attached to the roller e and includes a photodiode 12c and a phototransistor 12d below the roller 12a and is made into one chip.
2f is mounted on the substrate 12g. Photo reflector 12f is window 12f ₂ for detecting light incident by the window 12f ₁ and the phototransistor 12d outputs the light from the photodiode 12c is provided as shown in FIG. 4 (c).

On the lower surface side of the roller 12a facing the photo reflector 12f, as shown in FIG. 4B, the shield plate 1 is provided.
2b is formed, and the angle of the shield plate 12b with respect to the photo reflector 12f changes depending on the rotation position of the roller 12a, so that the light emitted from the photodiode 12c is blocked or made incident on the phototransistor 12d. Eggplant

That is, since the roller 12a and the shielding plate 12b are rotatably mounted on the frame 12e about the shaft portion 12a ₁ as shown in FIGS. 5 (a) and 5 (b), as shown in FIG. When the roller 12a is pressed against the magnetic tape 1, the roller 12a is rotated as the magnetic tape 1 runs, and the shield plate 12b is also rotated. Here, when the shield plate 12b is in the rotation position of FIG. 5A with respect to the photo reflector 12f, the light from the photodiode 12c output through the window portion 12f ₁ is shielded by the shield plate 12b,
It is not detected by the phototransistor 12d. However, when the shielding plate 12b is in the rotation position of FIG. 5B with respect to the photo reflector 12f, the light from the photodiode 12c output through the window 12f ₁ is emitted from the shielding plate 1b.
The light is not blocked by 2b and enters the phototransistor 12d through the window 12f ₂ .

Therefore, in the phototransistor 12d,
The incidence and non-incidence of light are repeated every 1/4 rotation of the roller 12a.
The detected waveform Sa as shown in (a) is output.
The diameter of the roller 12a is set such that the roller 12a rotates 4 times per second when running at the rated speed (4.76 cm / sec in a compact cassette tape).

In FIG. 1, 20 is a waveform shaping circuit,
The output of the phototransistor 12d with distortion is shaped into a square wave. That is, the output Sa of the rotary encoder 12 of FIG. 6A has a predetermined threshold value having a hysteresis, and the waveform shaping output Sb as shown in FIG. 6B is obtained.

Reference numeral 21 denotes a rotation time measuring unit, which is a roller 12
The time required for one rotation of a is calculated. 1 of roller 12a
The rotation corresponds to the period T in FIG. 6B, that is, the period from the rising (or falling) of the pulse to the rising (or falling) of the pulse two pulses after.

Reference numeral 22 denotes a deviation calculating section, which calculates one rotation cycle information (hereinafter, referred to as rated cycle information T ₀₂₅ ) of the roller 12a according to the rated speed of the magnetic tape running, and the input actual one rotation. The deviation d is calculated using the period T.
It should be noted that the rated cycle information T ₀₂₅ is 0.25 seconds because the roller 12a makes four revolutions per second when traveling at the rated speed. Deviation d
Is calculated by the following (Equation 1).

[Equation 1]

Reference numeral 23 is a gain coefficient generator, which outputs a coefficient K for setting the servo gain. Note that the coefficient K is always 1
In this case, it is not necessary to provide the gain coefficient generating section 23. However, by setting the coefficient K to a predetermined value, the servo gain is set, and the response of the servo operation described later can be set.

Further, by making the output coefficient K variable based on the calculated deviation d, the servo response is changed according to the tape running speed. For example, when the deviation d is large, that is, the tape running speed. The gain coefficient K is increased when the difference between the rated speeds is large, while the gain coefficient K is decreased when the tape running speed is close to the rated speed. As a result, it is possible to accelerate the pulling up to the rated speed and improve the servo stability at the rated speed.

Reference numeral 24 is a control constant generator, which generates a control constant A obtained by a functional expression of a rotation speed range of the reel motor 11 and a servo control value L described later. That is, it is a constant for obtaining the servo control value L that properly matches the variable rotation range of the reel motor, and thus the control constant A is a fixed value for each device. The control constant A is calculated as in the following (Equation 2).

[0029]

[Equation 2] However, N _MAX : Reel motor speed at tape top N _MIN : Reel motor speed at tape end L _MAX : Servo control value at tape top L _MIN : Servo control value at tape end

Reference numeral 25 denotes a control output calculation unit for calculating and outputting the servo control value L _N , and 26 stores the servo control value L _N output from the control output calculation unit 25, and supplies it to a data conversion unit 27 described later. Output storage unit. In the output storage unit 26, the supplied servo control value L _N is stored as the servo control value L, and this servo control value L is fed back to the control output calculation unit 25 as the previous servo control value L _N to obtain the servo control value L _N. Is used for calculation.

In the control output calculator 25, the deviation d
Using the gain coefficient K, the control constant A, and the fed back servo control value L, the current servo control value L _N is calculated as in the following (Equation 3).

[Equation 3]

The data conversion unit 27 converts the servo control value L supplied from the output storage unit 26 into a reference value for servo operation. For example, a resistance value corresponding to the servo control value L,
Convert to voltage value, pulse width, pulse period, etc. In this embodiment, it is assumed that the servo control value L is converted into a PWM (pulse width modulation) signal having "L period" (when "H period" is constant). Therefore, L _MAX and L _MIN used to calculate the control constant A are values corresponding to the pulse width of the “L period” at the tape top and the tape end in the PWM signal.

Reference numeral 28 is a motor servo circuit, for example, a drive for converting the supplied PWM signal into a voltage value (or resistance value) and feeding back the converted voltage value (or resistance value) from the reel motor 11. Servo output E _M is provided to the reel motor 11 so as to match the voltage value (or resistance value), and drive control of the reel motor 11 is performed so as to minimize the deviation d.

[0034] In the motor servo circuit 28 RV represents a semi-fixed resistor for adjusting a rotational speed range of the reel motor 11, the motor rotation N _{MA X} to N _MIN by adjusting the resistance value of the semi-fixed resistor RV The number range can be shifted. Therefore, when adjusting the motor rotation speed range, which will be described later, for example, at the time of tape top, N _MAX is adjusted so that the motor rotation speed at that time is a speed at which the tape rated traveling speed (4.76 cm / sec) is obtained. It may be set after being set.

In the recording or reproducing apparatus having the above circuit configuration, the rotation speed of the reel motor 11 is servo-controlled so that the running speed of the magnetic tape 1 is kept substantially constant from the tape top to the tape end. That is, when the roller 12a is rotated as the tape travels, the rotary encoder 12 outputs the rotation speed information Sa, and the waveform is shaped and output (Sb), the rotation time measuring unit 21 measures one rotation cycle T of the roller 12a. To be done. Then, the deviation d is calculated by the deviation calculator 22 using one rotation cycle T as described above, and is supplied to the control output calculator 25. The control output calculation unit 25 calculates the current servo control value L _N from the deviation d, the gain coefficient K, the control constant A, and the previous servo control value L, and supplies it to the output storage unit 26 for storage. The stored servo control value L is converted into a PWM signal by the data conversion unit 27, and the motor servo circuit 28 produces a servo output (motor drive voltage output) E _M based on the PWM signal to control the drive of the reel motor 11. To do.

By continuing the above operation, the number of revolutions of the reel motor 11 is gradually decreased from N _MAX to N _MIN according to the tape traveling position, that is, the winding diameter of the take-up reel 3, and the tape traveling. The speed is kept approximately constant.

Therefore, the recording medium such as a compact cassette tape used in the recording or reproducing apparatus is compatible with the recording or reproducing apparatus of the capstan system,
In addition, the frequency characteristic and the S / N do not change from the tape top to the tape end, and the faithful recording / reproducing operation is performed.

However, in order to realize this, the motor rotation speed range (N _{MAX to} N _MIN ) must be properly adjusted as described above. Therefore, in the present invention, the motor rotation speed range is adjusted by the adjusting method described below.

A first embodiment as an adjusting method will be described with reference to FIGS. In FIG. 1, 61 is a magnetic head 10.
The output of the reproduction amplifier 61 is a reproduction amplifier for extracting the reproduction signal from the recording / reproduction apparatus, and the output of the reproduction amplifier 61 is supplied to a frequency counter FC, which is an external device of the recording / reproduction apparatus, and the reproduction signal frequency is counted.

Here, since the adjustment tape cassette is used when adjusting the motor rotation speed range, this adjustment tape cassette will be described. When the motor rotation speed is adjusted with reference to the motor rotation speed at the tape top, an adjustment tape cassette 90 as shown in FIG. 7 is used. In the adjusting tape cassette 90, the magnetic tape 1A is very short, for example, about 30 seconds, and is wound from the supply reel 2A to the take-up reel 3A. Therefore, no matter what the tape running position is from the tape top to the tape end,
The reel winding diameter of the take-up reel 3A hardly changes. A constant frequency signal of, for example, 3 KHz is recorded on the magnetic tape 1A.

Therefore, when the adjusting tape cassette 90 is loaded and the reproducing operation is executed, 3 KHz is displayed as the frequency f displayed by the frequency counter FC if the vehicle is running at the rated speed.

The procedure of the adjusting operation is shown in FIG. At the time of the adjusting operation, the adjusting tape cassette 90 is loaded, and the tape running at the rated speed is executed by the servo system (F10
0, F101). Then, the frequency of the reproduction signal from the adjusting tape cassette 90 is measured by the frequency counter FC (F
102).

The reproduction frequency f (KHz) measured here is
The amount of deviation for 3 KHz is judged (F103). The deviation amount can be calculated, for example, as {(f-3) / 3} × 100, and if the absolute value of this deviation amount is, for example, 1 or less (= within deviation 1%), the motor rotation speed N _MAX becomes an appropriate value. Assuming that there is, the adjustment operation ends (F103 → F105). If there is a deviation of 1% or more, the semi-fixed resistance RV is adjusted (F104), and the resistance value is adjusted until the deviation amount is within 1%.

By the above adjusting operation, the motor rotation speed range is adjusted to an appropriate value, but at the time of this adjusting operation, it is not necessary to manage the tape position of the adjusting tape cassette 90, and the adjustment is performed in about 30 seconds. Even if the adjustment tape cassette 90 reaches the tape end without finishing, the adjustment work can be continued by directly reproducing the opposite surface of the adjustment tape cassette 90, and there is no need to rewind the tape.

The adjustment work of the semi-fixed resistance RV based on the measured value f of the frequency counter FC is performed manually by the adjusting operator, and the calculation means for calculating the deviation amount from the measured value f and the adjustment of the semi-fixed resistance RV are performed. It is also possible to provide control means to automate the adjustment device. Further, a frequency counter FC, a shift amount calculating means, and a semi-fixed resistor RV are provided inside the recording / reproducing apparatus.
A part or all of the adjustment control means may be provided.

By the way, when the adjustment of the motor rotation speed is executed with reference to the tape middle position or the tape end position, the adjusting tape cassette 90 shown in FIG. 7 is not suitable. When the tape middle position is used as a reference, the tape has a supply reel 2B and a take-up reel 3B whose reel diameter is equivalent to the tape winding diameter on the reel at the tape middle position as shown in FIG. A magnetic tape 1B having a tape length of about 30 seconds on which is recorded is prepared as an adjustment tape cassette 91. That is, the winding diameter of the take-up reel 3B (or the supply reel 2B which becomes the take-up reel during reverse reproduction) is always the diameter corresponding to the intermediate position of the tape, and similarly, the adjustment of the motor rotation speed range can be easily performed.

Further, when the tape end is used as a reference, the diameter of the take-up reel 3C as the adjusting tape cassette 92 corresponds to the tape winding diameter on the reel at the tape end as shown in FIG. To do. Magnetic tape 1C is 3
KHz is a tape length of about 30 seconds recorded.

However, it is difficult to make the supply reel 2C have a size corresponding to the tape winding diameter on the reel at the tape end due to the size of the cassette housing. In this case, the adjustment by the reproducing operation in the reverse direction is based on the tape end. However, it can be used, for example, for adjustment based on the tape top standard.

A second embodiment of the adjusting method will be described with reference to FIGS. In addition, this embodiment can be added to the first embodiment.

During the adjusting operation in the above-described embodiment, it is possible to perform the quick adjustment by driving the reel motor 11 at a constant rotation speed without applying the tape constant speed servo to the reel motor 11. This is because if the motor rotation speed changes due to the servo control value L, adjustment with the semi-fixed resistance RV becomes difficult.

Therefore, as shown in FIG. 10, a fixed value generator 62 for generating a predetermined servo control value Li and a switching circuit SW for switching the output of the control output calculator 25 and the output of the fixed value generator 62 are provided. Set up.

In the adjusting operation of this embodiment, as shown in FIG. 11, when the adjusting operation is started (F200), first, the switching circuit SW is switched.
Is switched to the T ₂ terminal (F201). Then, thereafter, the servo control value Li from the fixed value generator 62 is changed to the data converter 2
7, the servo reference value E _M based on the servo control value Li is output from the motor servo circuit 28, and the reel motor 11 is continuously driven to rotate at a constant rotation speed.

It should be noted that the above-mentioned FIG.
When the adjustment is performed using the adjustment tape cassette 90, the servo control value Li from the fixed value generation unit 62 is L _MAX which is the servo control value at the tape top.
The value is equal to. The servo control value Li is set to L _MIN when the tape end is adjusted as a reference, and is set to a value equal to the servo control value according to the position when the tape end is adjusted.

The actual adjustment operation procedure is the same as in FIG.
For example, by performing the playback operation of the adjustment tape cassette 90
(F202), obtain the measured value f by the frequency counter FC (F20
3), the deviation between this measured value f (KHz) and 3KHz is 1%
Adjust the semi-fixed resistance RV so that it is within the range (F20
3, F204, F205). When the deviation amount is within 1%, the switching circuit SW is switched to the T ₁ terminal, and the adjustment is completed (F20
6, F207). By this adjusting operation, the motor rotation speed can be adjusted more accurately and quickly. In addition to the switching of the switching circuit SW being manually performed by the operator, when the adjustment process is automated, the switching of the switching circuit SW may be automated.

The present invention can be widely applied to a recording-only device, a reproduction-only device, a recording / reproducing device, etc. corresponding to a recording medium such as a compact cassette tape, a microcassette tape and a digital audio tape.

[0056]

As described above, in the adjusting method using the adjusting tape cassette of the present invention, the tape management and the tape rewinding at the time of adjustment are not required, and the operation is easy, quick, and accurate.
There is an effect that the motor rotation speed adjustment can be executed. Further, at the time of adjustment, the reel rotation servo function is turned off so that the reel motor is rotated at a predetermined speed, whereby the ease, speed, and accuracy of the adjustment work can be further improved.

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of a first embodiment of the present invention.

FIG. 2 is a flowchart of an adjusting operation according to the first embodiment.

FIG. 3 is an explanatory diagram of a reel drive system according to an embodiment.

FIG. 4 is an explanatory diagram of a rotary encoder according to an embodiment.

FIG. 5 is an explanatory diagram of a detection operation of the rotary encoder according to the embodiment.

FIG. 6 is an explanatory diagram of output signals of the rotary encoder according to the embodiment.

FIG. 7 is an explanatory view of an embodiment of the adjusting tape cassette of the present invention.

FIG. 8 is an explanatory view of an embodiment of the adjusting tape cassette of the present invention.

FIG. 9 is an explanatory view of an embodiment of the adjusting tape cassette of the present invention.

FIG. 10 is a block diagram of an essential part of a second embodiment of the present invention.

FIG. 11 is a flowchart of the adjusting operation of the second embodiment.

[Explanation of symbols]

 1, 1A, 1B, 1C Magnetic tape 2, 2A, 2B, 2C Supply reel 3, 3A, 3B, 3C Take-up reel 11 Reel motor 12 Rotary encoder 21 Rotation time measurement unit 22 Deviation calculation unit 25 Control output calculation unit 27 data Conversion unit 28 Motor servo circuit 61 Reproduction amplifier 62 Fixed value generation unit 90, 91, 92 Adjustment tape cassette SW switching circuit FC Frequency counter RV Semi-fixed resistance

Claims (3)

[Claims] 1. A tape-shaped recording medium wound around a reel is rotatably driven to perform a running operation of the tape-shaped recording medium, and a variable range of the rotational speed of a motor for rotationally driving the reel is adjusted. Reel drive means having an adjusting section, tape running speed detecting means for detecting tape running speed information of the tape recording medium, and servo control value for a predetermined running speed of the tape recording medium based on the tape running speed information. And a servo means capable of controlling the number of rotations of the motor in the reel drive means so that the traveling speed of the tape-shaped recording medium becomes the predetermined traveling speed, and the tape traveling at the predetermined speed. A recording or reproducing device for recording or reproducing information on a recording medium is described below (A) to
A method for adjusting a tape constant-speed running servo system, wherein the variable range of the motor rotation speed in the reel drive means is adjusted by the operation (C). (A) An adjustment tape cassette in which the tape length is short enough that the winding diameter of the take-up reel does not substantially change from the tape top at the running position of the tape-shaped recording medium to the tape end, and a predetermined constant frequency signal is recorded. Is loaded and the reproducing operation is performed. (B) The frequency of the reproduction output obtained from the magnetic head while the tape-shaped recording medium in the adjustment tape cassette is running is measured by a frequency counter. (C) The adjustment section in the reel drive means is adjusted so that the frequency measured by the frequency counter substantially matches the predetermined frequency recorded on the tape-shaped recording medium in the adjustment tape cassette. 2. A tape-shaped recording medium wound around a reel is rotationally driven to execute a traveling operation of the tape-shaped recording medium, and a variable range of the rotational speed of a motor for rotationally driving the reel is adjusted. Reel drive means having an adjusting section, tape running speed detecting means for detecting tape running speed information of the tape recording medium, and servo control value for a predetermined running speed of the tape recording medium based on the tape running speed information. And servo means for controlling the motor rotation speed in the reel drive means so that the traveling speed of the tape-shaped recording medium becomes the predetermined traveling speed, and the servo means for the reel drive means from the servo means. It has a fixed value generation means that can cut off the supply of servo control values and supply the set fixed servo control values. Then, for the recording or reproducing device that records or reproduces information on or from the tape-shaped recording medium running at the predetermined speed, the motor in the reel drive means is operated by the following operations (A) to (D). An adjusting method for a constant-speed tape running servo system, characterized in that a variable range of the number of revolutions is adjusted. (A) The servo control value from the fixed value generating means is supplied to the reel drive means. (B) An adjustment tape cassette in which the tape length is so short that the winding diameter of the take-up reel does not substantially change from the tape top at the running position of the tape-shaped recording medium to the tape end, and a predetermined constant frequency signal is recorded. Is loaded and the reproducing operation is performed. (C) The frequency of the reproduction output obtained from the magnetic head while the tape-shaped recording medium in the adjusting tape cassette is running is measured by a frequency counter. (D) The adjustment section in the reel drive means is adjusted so that the frequency measured by the frequency counter substantially matches the predetermined frequency recorded on the tape-shaped recording medium in the adjustment tape cassette. 3. The tape length is so short that the winding diameter of the take-up side reel does not substantially change from the tape top of the running position of the tape recording medium to the tape end, and the tape recording medium has a predetermined constant frequency. An adjustment tape cassette characterized in that signals are recorded.