JPH0636403A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To exactly detect tape traveling speed information by setting a contact position of the roller of an adopted tape traveling speed detecting means with a tape-shaped recording medium. CONSTITUTION:The tape traveling speed detecting means 12 is arranged so as to be pressed to a tape on a tape traveling path between a recording or reproducing head 10 and a reel in a winding side 3. Or, the roller is arranged so as to press in the state of inserting and holding the tape between the roller and a pad. Consequently, the state of slipping is solved.

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 device using a magnetic tape or an open reel tape housed in a tape cassette housing as a recording medium is widely used. In these recording or reproducing devices, a capstan and a pinch roller are usually used. The magnetic tape is run at a constant speed by pressing it against the magnetic tape and 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 detect the tape running speed and execute the rotation speed servo control of the reel motor based on this. As a means for detecting the tape running speed, it is preferable to employ a rotary encoder having a roller that is pressed against the tape and rotates as the tape runs.

However, when speed is detected by the rotary encoder, it is difficult to perform accurate speed detection because slip occurs between the tape and the roller, and thus it is difficult to perform accurate servo control. There was a problem.

For example, when the back tension of the supply reel is insufficient, the contact pressure and contact area between the roller and the tape become unstable, and slip occurs. On the other hand, in order to obtain sufficient back tension of the supply-side reel to eliminate slippage, the structure is complicated, the torque of the winding-side reel is increased, the motor is increased accordingly, and the power consumption is increased. And so on, which is not preferable.

[0008]

In view of the above problems, the present invention is adopted in a reel drive type recording or reproducing apparatus for recording / reproducing by running a tape-shaped recording medium at a constant speed. By setting the contact position of the roller of the tape running speed detecting means with respect to the tape-shaped recording medium, it is possible to accurately detect the tape running speed information.

That is, the tape running speed detecting means is arranged so that the roller is pressed against the tape-shaped recording medium on the tape running path in the section from the recording or reproducing head to the take-up reel.

Alternatively, the recording medium accommodates the tape-shaped recording medium wound around a reel in a cassette housing, and a pad is provided which contacts the back surface of the tape-shaped recording medium on the running path of the tape-shaped recording medium. If it is a tape cassette,
The tape traveling speed detection means is arranged such that the roller is pressed against the tape-shaped recording medium at a position facing the pad, and the tape-shaped recording medium can be sandwiched between the roller and the pad.

[0011]

In the section of the tape running path between the take-up reel and the recording or reproducing head, the tension of the tape-shaped recording medium is extremely stable, and the pressure contact force is sufficient to rotate the roller of light weight and light rotation torque. Is obtained. Further, the pressure contact force and the contact area between the roller and the tape-shaped recording medium are also stabilized by bringing the roller into pressure contact with the pad via the tape-shaped recording medium.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, in a reel drive type recording or reproducing apparatus shown in FIGS. 18 to 23, a servo which obtains tape running speed information by using a rotary encoder and controls the reel rotation speed to realize tape constant speed running. A method example will be described, and then various embodiments will be described with respect to the arrangement state of the rotary encoder.

FIG. 18 is a block diagram showing a reel servo system of the recording or reproducing apparatus of the present invention. Reference numeral 1 denotes a magnetic tape wound and housed on a supply reel 2 and a take-up reel 3 in a tape cassette, which is loaded into the recording or reproducing apparatus of the embodiment and is run, so that the magnetic head 10 causes audio information and the like. The recording / reproducing operation 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. 20, 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. 18 and 20 denotes a rotary encoder provided to detect the tape traveling speed, and includes a roller 12a, a shield plate 12b provided on the roller 12a, and a photodiode 1 as a light output section.
2c, 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. As shown in FIG. 21C, the photo reflector 12f has a photodiode 12c.
A window 12f ₁ for outputting the light from and a window 12f ₂ for allowing the detection light to enter by the phototransistor 12d are provided.

A shield plate 12b is formed on the lower surface side of the roller 12a facing the photo reflector 12f as shown in FIG. 21 (b), and the angle of the shield plate 12b with respect to the photo reflector 12f depends on the rotational position of the roller 12a. Is changed so that the light emitted from the photodiode 12c is blocked or made incident on the phototransistor 12d.

That is, since the roller 12a and the shielding plate 12b are rotatably attached to the frame 12e about the shaft portion 12a ₁ as shown in FIGS. 22 (a) and 22 (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. 22A 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 transistor 12d. However, when the shielding plate 12b is in the rotation position of FIG. 22B with respect to the photo reflector 12f, the light from the photodiode 12c output through the window portion 12f ₁ is not shielded by the shielding plate 12b and the window is not blocked. The light is incident on the phototransistor 12d from the portion 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. 18, reference numeral 20 denotes a waveform shaping circuit, which shapes the output of the phototransistor 12d with distortion into a square wave. That is, a waveform shaping output Sb as shown in FIG. 23B is obtained, which has a predetermined threshold value having a hysteresis with respect to the output Sa of the rotary encoder 12 shown in FIG.

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. 23B, 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 calculation unit, which holds in advance 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. 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.

The deviation d is calculated by using the rated cycle information T ₀₂₅ and the input actual one rotation cycle T. That is,

[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 to a desired value, and the response of the servo operation 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).

[0028]

[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 denotes a motor servo circuit, which converts, for example, the supplied PWM signal into a voltage value (or resistance value), and the converted voltage value (or resistance value) is fed back 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.

Reference numeral 30 denotes a tape position calculating unit, which calculates the tape position T _P by the following (Equation 4).

[Equation 4] Here, R _T : rotation period of the roller 12a (second) T _T : tape thickness of the magnetic tape 1 (mm) v ₀ : rated running speed (mm / sec) T _END : time required from tape top to tape end ( Second) H: Radius (mm) of take-up reel 3 π: Circular ratio (However, this is the value when the reel motor 11 is rotating at the above initial value, and the initial value gives the rated speed at the tape top. If it is a value, T _END = 0)

Reference numeral 31 is a motor rotation speed calculation unit for calculating the rotation speed of the reel motor 11 based on the calculated tape position T _P. The motor rotation speed calculation unit 31 calculates a magnification M with respect to the initial value of the motor rotation speed, and multiplies this magnification M with the initial value to obtain a servo control value L _N corresponding to the motor rotation speed.
To get The magnification M is obtained by the following (Equation 5).

[Equation 5]

That is, if the initial value of the motor rotation speed (for example, the rotation speed at which the rated speed is obtained at the tape end) and the reel diameter are known, the current winding diameter of the winding reel 3 can be calculated from the output of the rotary encoder 12. Can be calculated.
Then, the number of rotations of the reel motor 11 for making the running of the magnetic tape 1 the rated speed can be calculated according to the tape winding diameter.

40 counts the rising edges of the pulse (Sb) output from the waveform shaping circuit 20,
This is a one-rotation detection unit that detects that the roller 12a has made one rotation since the start of tape running. In this embodiment, the roller 12
Since the detection pulse is obtained every 1/4 rotation of a, one rotation detection output is made at the time of the third counting of the pulse rise.

A switching circuit 44 supplies the contact SW ₁ with the servo control value L _N calculated by the control output calculator 25 based on the deviation d output from the deviation calculator 22.
Further, a servo control value L _N calculated based on the motor rotation speed obtained by multiplying the magnification M by the initial value in the motor rotation speed calculation unit 31 is supplied to the contact SW ₂ . The switching circuit 44 is connected to the contact SW ₂ at the time of starting the tape running, but is switched to the contact SW ₁ by the one-rotation detection output from the one-rotation detection unit 40.

In the recording or reproducing apparatus of the present embodiment constructed as described above, the deviation calculating section 2 is used except when the tape running is started.
In addition to performing the servo based on the servo control value L _N obtained by the calculation of (Equation 3) based on the deviation d calculated from one rotation cycle of the roller 12a obtained from
The current running position of the magnetic tape 1 is calculated from the rotation cycle of 2a, the number of rotations M of the reel motor 11 is calculated from the calculated running position, and the servo control value L _N is calculated based on this. . The rotation speed of the reel motor 11 is controlled so that the running speed of the magnetic tape 1 is kept substantially constant from the tape top to the tape end.

The servo operation is shown in the flow chart of FIG. That is, when the tape running is started, the switching circuit 44 is first controlled to be connected to the contact SW ₂ (F101). Therefore, the rotation cycle (T) measured by the rotation time measuring unit 21.
Based on the above, the tape position T _P is calculated by the tape position calculation unit 30 by the above (Formula 4) (F102, F103), and the magnification M is obtained by the motor rotation speed calculation unit 31 by the above (Formula 5).
Then, the servo control value L _N is calculated (F104).

This servo control value L _N is stored in the output storage unit 26.
Is stored as a servo control value L (F105), and the stored servo control value L is PWM by the data conversion unit 27.
It is converted to a signal (F106). The motor servo circuit 28 is PW
The servo output E _M is generated based on the M signal, and the drive control of the reel motor 11 is performed (F107). In other words, since this servo operation is not a feedback method using the deviation d,
The reel motor 11 is suddenly started up (for example, 1 second or less) near the proper motor rotation speed for the current tape position.

This servo control is executed, the switching circuit 44 is connected to the contact SW ₁ by the one-rotation detection signal from the one-rotation detecting section 40 (F108, F109), and thereafter, the deviation d is minimized by using the deviation d. Servo control is performed so that the servo control is converged so that

That is, one rotation cycle T of the roller 12a is determined by the output of the rotary encoder 12 and the rotation time measuring unit 21
(F110), the deviation calculation unit 22 obtains the deviation d as described above using one rotation period T, and the deviation d is supplied to the control output calculation unit 25 (F111). The control output calculation unit 25 calculates the current servo control value L _N by the calculation of (Equation 3).
(F112), which is supplied to the output storage unit 26 and stored as the servo control value L (F113). The stored servo control value L is converted into a PWM signal by the data conversion unit 27 (F114), and the motor servo circuit 28 makes a servo output E _M based on the PWM signal to control the drive of the reel motor 11 (F115). .

By continuing the above operation, the number of rotations of the reel motor 11 is gradually decreased according to the tape traveling position, that is, the winding diameter of the take-up reel 3, and therefore the tape traveling speed is substantially constant. Kept in. Therefore, the recording medium such as a compact cassette tape used in the recording or reproducing apparatus of the present embodiment is compatible with the recording or reproducing apparatus of the capstan system, and the frequency characteristic from the tape top to the tape end. A faithful recording / reproducing operation is performed without changing the S or N.

Further, since the tape traveling speed information is obtained in units of one rotation cycle of the roller 12a, the accuracy of the roller 12a (eccentricity of the shaft portion 12a ₁ and the shading plate 12b) is obtained.
Molding error or mounting error, roller roundness error etc.)
Even if the value is a little bad, these influences are cancelled, and accurate information (one rotation cycle T) can be obtained as the tape running speed information, and stable servo control can be performed. Further, the number of output pulses of the rotary encoder is not required to be large by setting one rotation cycle as a unit, and a pulse output of two cycles per rotation is sufficient as in the embodiment. It suffices to obtain a pulse output for one cycle at least once. This makes it possible to reduce the size and cost of the rotary encoder.

For example, in the servo control system of the reel motor in which the rotary encoder 12 is used as the tape running speed detecting means as described above, various embodiments of the present invention will be described with reference to FIGS. Will be explained. As shown in each figure, the magnetic head 1
0 (10a, 10b, 10c, 10a _(F) , 10a
_{(R )} , 10b _(F) , 10b _(R) 10c _(F) 10c _(R) )
And rotary encoder 12 (12 _(F) , 12 _(R) )
Is a head base 19 mounted on the mechanical chassis 19a
When the head base 19 slides in this state, the head base 19 is inserted into the tape cassette through the front window portion and pressed against the magnetic tape. A compact cassette tape or a microcassette tape is used as a recording medium in each embodiment, and its structure is shown in FIGS. 24 and 25.

In the compact cassette tape, as shown in FIG. 24, the magnetic tape 1 is wound around the supply reel 2 and the take-up reel 3 and housed in the housing 4, and the tape path is set by the guide rollers 5 and 5. The vehicle runs while being exposed in the windows 8a to 8e on the front surface of the housing 4. Also,
The pad 6 that is in contact with the back surface of the magnetic tape 1 in the window portion 8c is fixed to the leaf spring 6a and is arranged on the front surface of the shield plate 7.

As shown in FIG. 25, the microcassette tape accommodates the magnetic tape 1 wound around the supply reel 2 and the take-up reel 3 in the housing 4, and the tape path is set by the guide rollers 5 and 5. Then, the vehicle travels in a state of being exposed in the windows 9a to 9e on the front surface of the housing 4. Pads 6 and 6 which are brought into contact with the back surface of the magnetic tape 1 in the windows 9b and 9d are fixedly arranged on the leaf spring 6a.

The head 10 and the rotary encoder 12 of each embodiment in the recording / reproducing apparatus of the present invention using such a compact cassette tape or micro cassette tape as a recording medium are arranged as follows.

<Example 1 (FIG. 1)> Recording medium: Compact cassette tape Tape running: One direction running Magnetic head: Erasing / recording / playback combined head 10a ... Inserted through window 8c Rotary encoder: Rotary encoder 12 ...
Therefore, the rotary encoder 12 is pressed against the magnetic tape 1 in the tape path section between the magnetic head 10 and the take-up reel 3.

<Embodiment 2 (FIG. 2)> Recording medium: Compact cassette tape Tape running: One direction running Magnetic head: Erasing / recording / playback combined head 10a ... Inserted through window 8e Rotary encoder: Rotary encoder 12 ...
Therefore, the rotary encoder 12 is inserted into the pad 6 (see FIG. 24).
And the magnetic tape 1 is pressed against the magnetic tape 1 in a sandwiched state.

<Example 3 (FIG. 3)> Recording medium: Compact cassette tape Tape running: One direction running Magnetic head: Recording / playback head 10b ...
Inserted from Erase head 10c ... Inserted from window 8b Rotary encoder: Rotary encoder 12 ...
Therefore, the rotary encoder 12 is pressed against the magnetic tape 1 in the tape path section between the magnetic head 10 and the take-up reel 3.

<Example 4 (FIG. 4)> Recording medium: Compact cassette tape Tape running: One direction running Magnetic head: Recording / playback head 10b ... Window 8c
Inserted from Erase head 10c ... Inserted from window 8a Rotary encoder: Rotary encoder 12 ...
Therefore, the rotary encoder 12 is pressed against the magnetic tape 1 in the tape path section between the magnetic head 10 and the take-up reel 3.

<Example 5 (FIG. 5)> Recording medium: Compact cassette tape Tape running: Normal / reverse bidirectional running Magnetic head: Recording / playback head 10b ... Window 8c
Insert from Normal direction erasing head 10c _(F) ··· Insert from window 8b Reverse direction erasing head 10c _(R) ··· Insert from window 8d Rotary encoder: Normal direction rotary encoder 12 _(F) ..Inserted from window 8e Reverse direction rotary encoder 12 _(R) ... Inserted from window 8a Therefore, when traveling in the normal direction, the normal direction rotary encoder 12 _(F) includes the magnetic head 10 and the take-up reel. 3 is pressed against the magnetic tape 1 in the tape path section, and the reverse direction rotary encoder 12 _(R) is provided between the magnetic head 10 and the supply reel 2 which functions as a take-up reel at the time of running in the reverse direction. It is pressed against the magnetic tape 1 in the tape path section.

<Example 6 (FIG. 6)> Recording medium: Compact cassette tape Tape running: normal / reverse bidirectional running Magnetic head: Normal direction erasing / recording / playback combined head 10a _(F) ... From window 8e Insertion Reverse direction erasing / recording / playback combined head 10a _(R) ... Inserted from window 8a Rotary encoder: Normal / reverse bidirectional rotary encoder 12 ... Inserted from window 8c Therefore normal / reverse bidirectional The rotary encoder 12 includes the pad 6 (see FIG. 24) and the magnetic tape 1
Is pressed against the magnetic tape 1 in a sandwiched state.

<Example 7 (FIG. 7)> Recording medium: Microcassette tape Tape running: One-way running Magnetic head: Recording / playback head 10b ...
Insert from Erase head 10c ... Insert from window 9e Rotary encoder: Rotary encoder 12 ...
Therefore, the rotary encoder 12 is pressed against the magnetic tape 1 in the tape path section between the magnetic head 10 and the take-up reel 3.

<Embodiment 8 (FIG. 8)> Recording medium: microcassette tape Tape running: running in one direction Magnetic head: recording / playback head 10b ... Window portion 9d
Insert from Erase head 10c ... Insert from window 9e Rotary encoder: Rotary encoder 12 ...
Therefore, the rotary encoder 12 is inserted into the magnetic tape 1 in the tape path section between the magnetic head 10 and the take-up reel 3 and in a state where the magnetic tape 1 is sandwiched between the pad 6 (see FIG. 25). Pressed.

<Example 9 (FIG. 9)> Recording medium: Microcassette tape Tape running: One-way running Magnetic head: Erase / record / playback combined head 10a ... Inserted through window 9d Rotary encoder: Rotary encoder 12 ...
Therefore, the rotary encoder 12 is pressed against the magnetic tape 1 in the tape path section between the magnetic head 10 and the take-up reel 3.

<Example 10 (FIG. 10)> Recording medium: Microcassette tape Tape running: One-way running Magnetic head: Erase / recording / playback combined head 10a ... Inserted through window 9d Rotary encoder: Rotary encoder 12 ...
Therefore, the rotary encoder 12 is inserted into the magnetic tape 1 in the tape path section between the magnetic head 10 and the take-up reel 3 and in a state where the magnetic tape 1 is sandwiched between the pad 6 (see FIG. 25). Pressed.

<Embodiment 11 (FIG. 11)> Recording medium: Microcassette tape Tape running: One-way running Magnetic head: Erase / record / playback combined head 10a ... Inserted through window 9d Rotary encoder: Rotary encoder 12 ...
Therefore, the rotary encoder 12 is pressed against the magnetic tape 1 in the tape path section between the magnetic head 10 and the take-up reel 3. Further, in this case, the pressure contact location is the guide roller
(See FIG. 25).

<Embodiment 12 (FIG. 12)> Recording medium: Microcassette tape Tape running: One direction running Magnetic head: Recording / playback head 10b ...
Insert from Erase head 10c ... Insert from window 9e Rotary encoder: Rotary encoder 12 ...
Therefore, the rotary encoder 12 is pressed against the magnetic tape 1 in the tape path section between the magnetic head 10 and the take-up reel 3. Further, in this case, the pressure contact location is the guide roller
(See FIG. 25).

<Example 13 (FIG. 13)> Recording medium: Microcassette tape Tape running: normal / reverse bidirectional running Magnetic head: Normal direction recording / playback combined head 10b
_(F)・ ・ ・ ・ Inserted from window 9d Reverse direction recording / playback combined head 10b _(R)・ ・ ・ ・ Inserted from window 9b Normal direction erase head 10c _(F)・ ・ ・ ・ ・ ・ Inserted from window 9e Reverse Direction erasing head 10c _(R) ··· Inserted from window 9a Rotary encoder: normal / reverse bidirectional rotary encoder 12 ··· Inserted from window 9c Therefore, normal / reverse bidirectional rotary encoder when traveling in normal direction 12 is a magnetic head 1
0 (10b _(F) ) to the magnetic tape 1 in the tape path section between the take-up reel 3 and the normal / reverse bidirectional rotary encoder 12 when traveling in the reverse direction, the magnetic head 10 (10b _(R)) ) And the supply reel 2 that functions as a take-up reel at the time of reverse, the magnetic tape 1 is pressed against the tape path section.

<Example 14 (FIG. 14)> Recording medium: Microcassette tape Tape running: Normal / reverse bidirectional running Magnetic head: Normal direction erasing / recording / playback combined head 10a _(F) ... From window 9d Insert Reverse direction erasing / recording / playback combined head 10a _(R) ··· Insert from window 9b Rotary encoder: Normal / reverse bidirectional rotary encoder 12 ··· Insert from window 9c Therefore, when traveling in normal direction The normal / reverse bidirectional rotary encoder 12 is the magnetic head 1
0 (10a _(F) ) to the magnetic tape 1 in the tape path section between the take-up reel 3 and the normal / reverse bidirectional rotary encoder 12 when traveling in the reverse direction, the magnetic head 10 (10a _(R)) ) And the supply reel 2 that functions as a take-up reel at the time of reverse, the magnetic tape 1 is pressed against the tape path section.

<Example 15 (FIG. 15)> Recording medium: Microcassette tape Tape running: One-way running Magnetic head: Erase / recording / playback combined head 10a ... Inserted through window 9b Rotary encoder: Rotary encoder 12 ...
Therefore, the rotary encoder 12 is pressed against the magnetic tape 1 in the tape path section between the magnetic head 10 and the take-up reel 3. Further, in this case, the pressure contact location is the guide roller 5
(See FIG. 25).

<Example 16 (FIG. 16)> Recording medium: Microcassette tape Tape running: One direction running Magnetic head: Recording / playback head 10b ... Window portion 9b
Insert from Erase head 10c ... Insert from window 9d Rotary encoder: Rotary encoder 12 ...
Therefore, the rotary encoder 12 is pressed against the magnetic tape 1 in the tape path section between the magnetic head 10 and the take-up reel 3. Further, in this case, the pressure contact location is the guide roller
(See FIG. 25).

<Example 17 (FIG. 17)> Recording medium: Microcassette tape Tape running: One-way running Magnetic head: Recording / playback head 10b ... Window part 9b
Insert from Erase head 10c ... Insert from window 9d Rotary encoder: Rotary encoder 12 ...
Therefore, the rotary encoder 12 is inserted through the window 9c.
It is pressed against the magnetic tape 1 in the tape path section between the (erasing head 10c) and the take-up reel 3. Further, in this case, the pressure contact locations are the recording / playback head 10b and the erasing head 10.
It is a section between c.

As described above, in the present invention, the rotary encoder 12 (or 12 _(F) , 12 _{(R )} ) is the tape between the magnetic head 10 and the take-up reel 3 (the supply reel 2 in the case of reverse running). The magnetic tape 1 is pressed against the magnetic tape 1 in a pass section, that is, a section where a certain amount of tension is obtained irrespective of the magnitude of the back tension of the supply-side reel, and / or the magnetic tape 1 is sandwiched between the magnetic tape 1 and the pad 6. It is pressed against the tape 1.

Therefore, the roller 12a of the rotary encoder 12 and the magnetic tape 1 can be in a good pressure contact state (pressure contact force and pressure contact area), and slippage between the roller 12a and the magnetic tape 1 can be eliminated. Therefore, accurate tape running speed information can be obtained.

In addition to the above-mentioned arrangement, the rotary encoder 12 is inserted near the guide roller 5 where the tape tension is good as in the eleventh embodiment, the twelfth embodiment, and the sixteenth embodiment. By this, the pressure contact state can be improved. Also, when the rotary encoder 12 is inserted between the recording / playback head 10b and the erasing head 10c as in the seventeenth embodiment, the pressure contact state can be similarly improved.

Of course, the present invention is not limited to the above-mentioned 17 kinds of embodiments, and various other ideas are conceivable. The present invention can be widely applied to devices, read-only devices, recording / playback devices, and the like. Also for an open reel tape, it is also possible to provide a pad on the recording / reproducing apparatus side in contact with the back surface of the tape so that the pad and the roller of the rotary encoder come into contact with the tape in a sandwiched state.

[0070]

As described above, according to the present invention, the reel drive type recording or reproducing apparatus is provided with the tape running speed detecting means having the roller which is rotated in pressure contact with the tape-shaped recording medium. The pressure contact of the roller is configured to be performed in the traveling path section from the magnetic head to the take-up reel, so that a good pressure contact state between the roller and the tape-shaped medium can be obtained, and the slip is eliminated. Therefore, there is an effect that the tape running speed can be accurately detected.

Further, when a tape cassette having a pad is used as a recording medium, the roller may be pressed against the tape-shaped recording medium with the tape-shaped recording medium held between the pad and the roller. There is an effect that a good pressure contact state can be obtained and the tape running speed can be accurately detected. From these, the tape constant-speed running servo in the reel drive system is excellently realized.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram of a main part of a second embodiment of the present invention.

FIG. 3 is an explanatory diagram of a main part of a third embodiment of the present invention.

FIG. 4 is an explanatory diagram of a main part of a fourth embodiment of the present invention.

FIG. 5 is an explanatory diagram of a main part of a fifth embodiment of the present invention.

FIG. 6 is an explanatory diagram of a main part of a sixth embodiment of the present invention.

FIG. 7 is an explanatory diagram of a main part of a seventh embodiment of the present invention.

FIG. 8 is an explanatory diagram of a main part of an eighth embodiment of the present invention.

FIG. 9 is an explanatory diagram of a main part of a ninth embodiment of the present invention.

FIG. 10 is an explanatory diagram of a main part of a tenth embodiment of the present invention.

FIG. 11 is an explanatory diagram of a main part of an eleventh embodiment of the present invention.

FIG. 12 is an explanatory diagram of a main part of a twelfth embodiment of the present invention.

FIG. 13 is an explanatory diagram of a main part of a thirteenth embodiment of the present invention.

FIG. 14 is an explanatory diagram of a main part of a fourteenth embodiment of the present invention.

FIG. 15 is an explanatory diagram of a main part of a fifteenth embodiment of the present invention.

FIG. 16 is an explanatory diagram of a main part of a sixteenth embodiment of the present invention.

FIG. 17 is an explanatory diagram of a main part of a seventeenth embodiment of the present invention.

FIG. 18 is a block diagram of a configuration example of a servo system adopted in the embodiment.

FIG. 19 is a flowchart showing the operation of the servo system adopted in the embodiment.

FIG. 20 is an explanatory diagram of the reel drive structure of the embodiment.

FIG. 21 is an explanatory diagram of a rotary encoder according to an embodiment.

FIG. 22 is an explanatory diagram of a detection operation of the rotary encoder of the embodiment.

FIG. 23 is an explanatory diagram of output signals of the rotary encoder according to the embodiment.

FIG. 24 is an explanatory diagram of a compact cassette tape.

FIG. 25 is an explanatory diagram of a micro cassette tape.

[Explanation of symbols]

1 magnetic tape 2 supply reel 3 take-up reel 8a, 8b, 8c, 8d, 8e, 9a, 9b, 9c, 9
d, 9e Window part 10 Magnetic head 11 Reel motor 12, 12 _(F) , 12 _(R) Rotary encoder 12a Roller 12b Shield plate 12c Photodiode 12d Phototransistor

Claims (2)

[Claims] 1. A roller for recording or reproducing information on or from a tape-shaped recording medium wound on a reel, and being in pressure contact with the tape-shaped recording medium and rotating as the tape-shaped recording medium runs. In the recording or reproducing apparatus having the tape traveling speed detecting means having the tape traveling speed detecting means, the tape traveling speed detecting means includes the tape-shaped recording medium on the tape traveling path in a section from the recording or reproducing head to the winding reel. A recording or reproducing apparatus, which is arranged so as to be capable of being pressed into contact with. 2. A tape provided with a tape-shaped recording medium wound around a reel in a cassette housing, and provided with a pad that comes into contact with a back surface of the tape-shaped recording medium on a traveling path of the tape-shaped recording medium. A recording or reproducing apparatus having a tape running speed detecting means for performing a recording or reproducing operation of information with respect to a cassette and having a roller which is pressed against the tape recording medium and rotates as the tape recording medium runs. The recording / reproducing apparatus is characterized in that the tape traveling speed detecting means is arranged so that the roller can sandwich the tape-shaped recording medium at a position facing the pad.