JPH10255352A - Information signal recording / reproducing device - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To employ a direct drive in which a reel and a motor are directly connected in helical scan recording to simplify the mechanism and reduce tape damage. A constant speed control and a tension control of a tape without a camping stun are performed by controlling a winding and supply reel motor (9, 3) to an angular velocity corresponding to a tape winding radius at that time. The winding radius of the tape is calculated from the angular speeds of the winding and supply reels 7, 1 with respect to the total winding amount of the tape. The total winding amount of the tape can be calculated from the known hub diameter and the angular velocity at the start or end of the tape. Since the detection of the speed of the reel motor requires a very high sample frequency due to the specifications, the magnetic detectors are arranged at intervals less than the magnetization interval of the magnetization layer in the generator, and the frequency of the apparently multiplied frequency is Try to get a signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel drive system in which a take-up reel and a supply reel are connected to a reel motor, respectively. The present invention relates to a small and thin information recording / reproducing apparatus which can perform the information recording / reproducing.

[0002]

2. Description of the Related Art In a conventional 8 mm data recorder, a pair of reels, both ends of which are wound on a magnetic tape, are mounted on a pair of reel bases, and the tape is pulled out from the reels by a tape loading means. The tape is loaded on a drum, the loaded tape is sandwiched between a capstan and a pinch roller, and the capstan is driven to rotate so that the tape runs at a constant speed, and recording or reproduction is performed by the rotary head.

In order to run a tape at high speed,
The pinch roller is separated from the capstan, and the tape runs only by the pair of reels. The above known example is described in JP-A-57-176558.

[0004]

The 8 mm data recorder is affected by downsizing, personal use and the like, and is required to be downsized. Further, in order to promote large-capacity data, tape running with less tape damage has become indispensable as tapes become thinner.

An object of the present invention is to eliminate the above-mentioned problems of the prior art and to run a tape by a pair of reel drive systems in which a reel motor and a reel are directly connected, and to transmit a digital signal obliquely on the tape by a rotating head. An object of the present invention is to provide a tape running system in which recording and reproduction are performed by helical scanning to reduce a complicated tape running mechanism and reduce tape damage.

[0006]

In order to solve the above-mentioned problems, a supply reel table to which the supply reel is fitted, a take-up reel table to which the take-up reel is fitted, and a supply reel table to which the take-up reel is fitted. A supply reel driving means connected coaxially with the rotation axis thereof to rotationally drive the supply reel table; and a supply reel driving means connected coaxially with the rotation axis to the take-up reel table to rotationally drive the take-up reel table. Take-up reel drive means, and a capstan motor for running the magnetic tape is not mounted, and the magnetic tape is provided with the supply reel drive means and the take-up reel drive means. Prepare.

[0007] Further, first detecting means for detecting a rotational angular velocity of the supply reel driving means, second detecting means for detecting a rotational angular velocity of the take-up reel driving means,
Detecting means for detecting the total winding amount of the magnetic tape from the output result of the detecting means and the output result of the second detecting means; the output of the first detecting means and the second detecting means Fourth detecting means for detecting the running speed of the tape based on the output of the third detecting means, and controlling the rotational angular velocity of the take-up reel motor based on the output of the fourth detecting means. Magnetic tape speed control means, means for sending the output signal of the magnetic tape speed control means to the take-up reel drive means, tape tension detection means disposed between the supply reel and the recording and reproducing unit, A tension control unit is provided for sending a tension control signal to the supply reel driving unit so that the tape has a predetermined tension based on the output of the tape tension detection.

[0008] Further, the diameter of the rotating portion of the supply reel motor and the take-up reel motor is not less than 30 mm and not more than 47 mm.

[0009] The diameters of the rotating parts of the supply reel motor and the take-up reel motor are not less than 38 mm and not more than 42 mm.

[0010] The diameters of the rotating parts of the supply reel motor and the take-up reel motor are approximately 40 mm.

[0011] Further, a center distance between the take-up reel motor and the supply reel motor is located at 46.2 mm ± 3 mm.

Further, the center distance between the take-up reel motor and the supply reel motor is located at 46.2 mm ± 1.5 mm.

Further, the center distance between the take-up reel motor and the supply reel motor is located at about 46.2 mm.

[0014] Further, there is provided means for mounting the take-up reel motor and the supply reel motor on a base, and the base is dimensioned such that one side is 80 mm or more and 110 mm or less and the other side is 6 mm or more.
It is between 0 mm and 90 mm.

[0015] Further, one side of the base is 90 mm.
100 mm or less, and the other side is 70 mm or more and 80 mm or less.

[0016] Further, there is provided means for mounting the take-up reel motor and the supply reel motor on a substrate, and the dimensions of the substrate are approximately 95 mm on one side and approximately 75 mm on the other side.

Further, the height dimension of the take-up reel motor and the supply reel motor with the lower surface of the base as a reference plane,
It is configured to be 15mm or more and 23mm or less.

Further, the height dimension of the take-up reel motor and the supply reel motor with the lower surface of the base as a reference plane,
It is configured to be 17mm or more and 21mm or less.

Further, the height dimension of the take-up reel motor and the supply reel motor with the lower surface of the base as a reference plane,
It is configured to be approximately 19mm.

Further, the both reel bases are located at a height of 5 mm or more and 8 mm or less from a rotating portion of the both reel motors.

Further, the both reel bases are positioned at a height of 6 mm or more and 7 mm or less from the rotating portions of the both reel motors.

Further, the both reel bases are located at a height of approximately 6.5 mm from the rotating parts of the both reel motors.

The first detecting means for detecting the rotational angular velocity of the supply reel motor and the second detecting means for detecting the rotational angular velocity of the take-up reel motor detect the entire circumference of the rotating parts of the two reel motors. , 470 or more and 738 or less, further comprising frequency generating means for detecting the divided part, and means for multiplying the frequency of the take-up reel.

The first detecting means for detecting the rotational angular velocity of the supply reel motor and the second detecting means for detecting the rotational angular velocity of the take-up reel motor are provided for detecting the entire circumferences of the rotating parts of the two reel motors. , 595 or more and 600 or less, further comprising a frequency generating means for detecting the divided part, and a means for multiplying the frequency of the take-up reel.

The first detecting means for detecting the rotational angular velocity of the supply reel motor and the second detecting means for detecting the rotational angular velocity of the take-up reel motor detect the entire circumference of the rotating parts of the two reel motors. , And a frequency generating means for detecting the divided part, and a means for multiplying the frequency of the take-up reel.

The take-up reel motor has a torque constant as a torque generating capability of not less than 200 gcm / A and not more than 500 gcm / A.

The take-up reel motor has a torque constant of 260 gcm / A or more and 450 gcm / A or less. Further, the take-up reel motor has a torque constant as a torque generation ability of: It is composed of almost 320gcm / A.

[0028] The torque constant of the supply reel motor as a torque generating capability is in the range of 50 gcm / A to 200 gcm / A.

Further, the torque constant of the supply reel motor as a torque generating capability is set to be 70 gcm / A or more and 180 gcm / A or less.

Further, the torque constant of the supply reel motor as a torque generating capability is configured to be approximately 100 gcm / A.

The inertial mass of the take-up reel motor and the supply reel motor is configured to be 0.05 gcms2 or more and 0.24 gcms2 or less.

The inertia mass of the take-up reel motor and the supply reel motor is configured to be 0.10 gcms2 or more and 0.20 gcms2 or less.

Further, the inertial mass of the take-up reel motor and the supply reel motor is configured to be approximately 1.15 gcms2.

Further, the steady loss torque of the supply reel motor is configured to be 1 gcm or more and 4 gcm or less.

Further, the steady loss torque of the supply reel motor is set to be 1.5 gcm or more and 3 gcm or less.

Further, the steady loss torque of the supply reel motor is configured to be approximately 2 gcm.

Further, the supply reel drive means includes current drive means for changing a current value flowing to the supply reel motor based on a voltage value input to the supply reel drive means. Comprises a voltage drive means for changing a voltage value applied to the take-up reel motor based on a voltage value inputted to the take-up reel drive means.

Further, the tape tension at the time when the take-up reel winds the magnetic tape is configured to be 12 gf or more and 40 gf or less.

Further, the tape tension when the take-up reel winds the magnetic tape is configured to be 12 gf or more and 30 gf or less.

The tape tension when the take-up reel winds the magnetic tape is configured to be approximately 12 gf.

The tape tension at the time when the supply reel supplies the magnetic tape is set to 2 gf or more and 6 gf or less.

The tape tension at the time when the supply reel supplies the magnetic tape is set to 2 gf or more and 4 gf or less.

Further, the tape tension when the supply reel supplies the magnetic tape is configured to be approximately 3 gf.

Further, eight to twelve tape guides are provided between the supply reel and the take-up reel to guide the running of the magnetic tape, and at least one of the tape guides is movable. It is comprised in.

Further, eight to ten tape guides for guiding the running of the magnetic tape are arranged between the supply reel and the take-up reel, and at least one of the tape guides is movable. It is comprised in.

The magnetic tape has a width of 8 mm.

Further, there are provided an integrating means for sequentially integrating the output result of the speed control means, and an adding means for adding the output result of the magnetic tape speed control means and the output result of the integrating means.

An information signal recording / reproducing apparatus in which a 3.5-inch half-height size, that is, its outer shape can be accommodated in a size having a width of about 101.6 mm, a height of about 41.3 mm, and a depth of about 158.2 mm. It is.

According to the above configuration, the take-up reel motor and the supply reel motor can be stably controlled at a low speed of 0.5 rad / sec to 0.1 rad / sec, and each directly connected reel base is directly driven. The tape can be stably driven at a constant speed.

Also, there is an effect that the 3.5-inch half-height size, that is, the outer shape can be stored in a size having a width of approximately 101.6 mm, a height of approximately 41.3 mm, and a depth of approximately 158.2 mm.

Since the switching of the tape running direction does not use the capstan, the response is improved and the tape is more effectively reduced.

[0052]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an information signal recording / reproducing apparatus according to the present invention, wherein 1 is a supply reel,
2 is a reel base on which a supply reel is mounted, 3 is a supply reel motor, 4 is an angular velocity detector for detecting the angular velocity of the supply reel motor, 5 is a motor driver for driving the supply reel motor, 6 is a tension controller, 7 is Take-up reel, 8 is a reel base on which the take-up reel is mounted, 9 is a take-up reel motor, 10 is an angular velocity detector that detects the angular velocity of the take-up reel motor, 11
Is a motor driver for driving the take-up reel, 12 is a speed controller, 13 is a tape, 14 is a drum motor, 15 and 16 are rotary heads, 17 is an output terminal, 18 is an input terminal, 19 is a reproducing circuit, and 20 is A recording circuit, 21 is a tension detector, 22 is a drum, 23 is a tape winding amount detector, and 24 is a tape speed detector.

The digital signal input from the input terminal 18 is signal-processed by the recording circuit 20 and then helically recorded on the tape 13 by the rotary heads 15 and 16 attached to the outer periphery of the drum 22. During playback, the rotating head 1
The reproduction signals read from the tape 13 by the signals 5 and 16 are processed by the reproduction circuit 19 and output from the output terminal 17.

Next, a tape drive control of a reel direct drive system in which a supply reel and a take-up reel are directly connected to a reel base and a reel motor, respectively, will be described below.

In order to control the tape winding speed by the winding reel 7 to be constant, information on the tape winding radius of the winding reel 7 is essential.

If the tape speed at which the take-up reel 7 winds the tape 13 is vt, the rotation frequency of the take-up reel 7 is ft, and the current tape winding radius of the take-up reel 7 is Rt0, the tape winding of the take-up reel is performed. The takeoff speed vt is given by the following equation (1). Similarly, the speed vt at which the supply reel 1 feeds the tape is given by the following equation (2).

When the tape speed at the time of normal recording and reproduction of a data recorder using a tape having a tape width of 8 mm described in the present invention is, for example, 23.6633 mm / sec, the rotation frequency ft of both reels is 0.47 Hz to 0.17 Hz. It can be seen that the reel rotates at a very constant speed. Here, the tape winding radius of the take-up reel 7 and the supply reel 1 is, for example, in a range from a minimum radius of 8 mm to a maximum radius of 21.6 mm.

[0059]

(Equation 1)

[0060]

(Equation 2)

The constant tape speed control in the reel-directed drive can be realized by changing the rotational angular velocity of the take-up reel in accordance with the radius of the take-up reel which sequentially changes as the tape runs.

The rotation frequency of both reels required for the above calculation is detected by the supply reel motor rotation angular velocity detector 4 and the take-up reel motor rotation angular velocity detector 10 shown in FIG.

The rotation angular velocity information of the two reel motors is
Each is sent to the tape winding amount detector 23, and the projected area of the supply reel and the winding reel (hereinafter referred to as the total tape winding amount) and the tape winding radius of the winding reel 7 are calculated.

The result of calculation of the winding radius of the take-up reel 7 and the result of detection of the rotational angular velocity of the take-up reel motor 9 are sent to a tape speed detector 24 to calculate the tape speed vt.

The detection result of the tape speed detector 24 is sent to the speed controller 12, and the speed error information from the target tape speed is amplified and sent to the motor driver 11. That is, the rotation angular speed of the take-up reel motor 9 is controlled so that the tape speed runs at the target speed.

The take-up reel motor 9 is connected to the motor driver 1
1 is driven to rotate in accordance with the output signal from the control unit 1.

Next, the drive of the supply reel motor 3 applies a driving force in a direction opposite to the running direction of the tape 13 (hereinafter referred to as a back torque) so that the tape 13 can run with a constant tension. Perform tension control. In order to detect the tension of the tape, a tension detector 21 is provided between the drum 22 and the supply reel 1 as shown in FIG. 1, and the result of the tension detection is sent to the tension controller 6 via the motor driver 5. Thus, the back torque of the supply reel motor 3 is controlled so as to always reach the target tension. Here, an example of the radius calculating means of both reels in the reel direct drive tape driving method taken up in the embodiment of the present invention will be described below.

First, in calculating the radius of the reel, the total tape winding amount information is indispensable. The tape total winding amount information indicates the projected area of both reels on which the tape is wound.

The means for calculating the total tape winding amount information is performed in the following steps.

The total area S0 of the projection area Ss of the supply reel and the projection area St of the take-up reel (hereinafter referred to as the total projection area) is constant regardless of the tape position. This relationship is shown in equation (3).

[0071]

(Equation 3)

From the above equations (1) to (3), the take-up reel radius
Rt0 is calculated by equation (4).

[0073]

(Equation 4)

In the case of a reel direct drive having no means for directly detecting the actual tape speed, such as a timer roller or a capstan, as in the embodiment of the present invention, the radius of the reel hub around which the tape is wound is known. From that
It is necessary to calculate the total winding amount of the tape at the beginning or end of the tape.

Next, a description will be given of a means for calculating the total tape winding amount at the beginning or end of the tape in this embodiment.

Assuming that the radius of the supply reel is Rs0, the tape thickness is Td, the number of rotations of the supply reel is s, and the number of rotations of the take-up reel is Nt, the tape movement amount Ls from the supply reel is calculated by equation (5). You.

[0077]

(Equation 5)

The amount Lt of the tape moved to the take-up reel is calculated by equation (6).

[0079]

(Equation 6)

Since the amount of tape movement of both reels is equal,
Rs0 and Rt0 are calculated by equations (7) and (8).

[0081]

(Equation 7)

[0082]

(Equation 8)

Through the above calculation process, the total tape winding amount calculation is performed.

Next, the most important shape, performance and controllability of the reel motor in the present invention will be described.

First, the shape of the reel motor will be described.

FIGS. 2 and 3 are external views of a reel motor used in the present invention.

In FIG. 2, 25 is an angular velocity detector for detecting the angular velocity of the supply reel motor, 26 is an angular velocity detector for detecting the angular velocity of the take-up reel motor, and 27 is mounted on the outer periphery of the rotating rotor of the supply reel motor. It is a magnetic layer and its outer periphery is magnetized at equal intervals. Reference numeral 28 denotes a magnetic layer attached to the outer periphery of the rotary rotor of the take-up reel motor, and the outer periphery is magnetized at equal intervals. 2
Reference numerals 9 and 30 denote a rotating rotor of a reel motor, 31 denotes a base on which the motor is mounted, 32 denotes a projection for fitting the reel motor and the reel base, 33 denotes a projection for positioning a reference surface of the reel base, and 34 denotes a reel rotating rotor. The part 35 is an armature of the motor mounted on the base 31.

The device size of the capstanless information signal recording / reproducing device (hereinafter referred to as an 8 mm data recorder) of the present invention is a 3.5 inch half-height size, that is, a width of approximately 101.6 mm, a height of approximately 41.3 mm, and a depth of approximately 41.6 mm. The dimensions are almost 158.2mm.

Therefore, in order to accommodate the mechanism and reel motor of the 8 mm data recorder in the 3.5-inch half-height size, at least the dimensions of the reel motor and mechanism need to be as follows.

First, the shape of the reel motor was the same as that shown in FIGS. The rotating rotor diameter of both reel motors should be at least 30mm-47mm, preferably 38mm-42mm
Limited to. In terms of the servo control performance, the control performance improves as the diameter of the reel motor increases. However, in the configuration for the purpose of miniaturization as in the present embodiment, the diameter of the reel motor cannot be determined to be at least 30 mm to 47 mm due to a mechanism not shown.

The rotation center distance between the two reel motors is
It is determined from the tape car set dimensions of the 8mm data recorder and is limited to an accuracy of at least 46.2mm ± 3mm or less.

Next, the dimensions of the base of the reel motor are limited to dimensions of at least 80 mm to 110 mm in width and 60 mm to 90 mm in height because the width of the apparatus is set to 3.5 inches.

Next, the height of the reel motor is at least 15 mm to 23 mm from the base 31.

Further, the dimension from the surface of the reel motor rotating rotor section to the projection 32 for fitting the reel motor and the reel base is limited to at least 5 mm to 8 mm, and the motor for exclusive use of the reel direct drive used in the present invention.

Next, the performance of the reel motor will be described below.

As described in the operation description of FIG. 1, in the reel direct drive of the present invention, the take-up reel motor 9 controls the speed so that the speed of the take-up tape is constant, and the supply reel motor 3 Gives a back torque to the tape to control the tension of the tape. Therefore, a reel motor having a different performance between the supply side and the winding side is required.

First, the required performance of the take-up reel motor will be described.

In the present invention, the winding radius of the winding reel is 0.8c
m to 2.16 cm, and the take-up torque is 12 gfcm or more and 40 gfcm or less.
At least 200 gcm / A or more and 500 gcm / A or less are required.

Further, the rotation frequency of the reel is 0.47 Hz to 0.17.
Since the rotation speed is very low (Hz), the larger the inertial mass of the reel, the more stable the rotation. However, in the present invention, the inertia mass of the take-up reel is 0.05 gcms2 or more and 0.24 gcm due to the problem of the response performance of the reel and the relationship with a mechanism configuration not shown.
The configuration was limited to s2 or less.

Next, the required performance of the supply reel motor will be described.

In this embodiment, since the reel winding radius of the supply reel changes from 0.8 cm to 2.16 cm, and the tape tension on the supply reel during normal recording and reproduction is, for example, 3 gf to 5 gf, the back torque of the supply reel motor is reduced. Minimum value is 2.4gcm ~
4 gcm.

Generally, as the torque constant of the motor increases, the loss torque of the motor tends to increase. Therefore, in order to reduce the motor loss torque to 2.4 gcm to 4 gcm, the motor torque constant of the supply reel must be at least 50 gc.
It is determined to be not less than m / A and not more than 200 gcm / A.

FIG. 7 shows the characteristics of the take-up reel motor and the supply reel motor configured on the basis of the above. This figure generally shows the number of rotations and the current with respect to the motor-generated torque indicating the performance of the motor.
el and the supply reel are indicated by S-Reel. Also,
The rotation speed with respect to the generated torque of the motor is denoted by τ-N, and the current with respect to the generated torque of the motor is denoted by τ-I.

Here, the torque constant of the take-up reel is 320 g
cm / A, and the torque constant of the supply reel is 110 gcm / A.

Next, the angular velocity detector of the reel motor will be described. Generally, when controlling the angular velocity of a motor to a constant speed, negative feedback speed control is applied to the motor. The higher the response frequency of the negative feedback control, the more stable the negative feedback control can be performed.

In order to increase the response frequency, it is necessary to increase the sampling rate for detecting the rotational angular velocity of the motor. That is, the object is to increase the number of frequency generators detected during one rotation of the motor. In the present invention, the number of frequency generators of the take-up reel and the supply reel is set to at least 47
Limited to 0p / r or more and 738p / r or less.

4 is a magnetic detector, 37 is a doubler,
38 is a plastic magnetic layer, and 39 is a rotating rotor of the motor. A plastic magnetic layer 38 is provided on the outer periphery of the rotating rotor of the motor, and the N and S poles are magnetized at equal intervals.

The magnetic layer 39 is rotated with the rotation of the motor, and the magnetic field variation is converted into an electric signal by the magnetic detector 36 disposed close to the magnetic layer 39. The output of the magnetic detector 36 tends to decrease as the magnetization interval of the magnetic layer 38 decreases, and the plastic magnetic layer 38 has a limit in the magnetization interval.

The limit value of the magnetization interval is approximately 200 μm for the plastic magnetic layer.

Therefore, for example, when the diameter of the rotating rotor of the motor is
If it is 40 mm, the magnetization number of the magnetic layer 39 is 628 p / r.

In the information signal recording / reproducing apparatus according to the embodiment of the present invention, for example, since the tape speed is 23.6 mm / sec and the radius of the take-up reel is 8 mm to 21.6 mm, the rotational frequency of the take-up reel is , 0.47 Hz to 0.17 Hz.

In order to rotate the take-up reel stably at a speed variation of 2% or less, a sample frequency for controlling the speed of the take-up reel needs to be approximately 850 Hz or more.

A frequency generator of a take-up reel motor determines the sample frequency of the take-up reel.
However, from the sample frequency of the take-up reel and the rotational frequency of the take-up reel, it is clear that the whole number of divisions of the take-up reel motor is required to be 5000 p / r or more.

However, the frequency generator of the reel motor according to the embodiment of the present invention is 628 pp / r.

A method of apparently increasing the frequency generator (hereinafter referred to as "multiplication") will be described below.

Here, a case where the multiple is 4 will be described as an example with reference to FIG.

In FIG. 5, 41 is a plastic magnetized layer, 42 is N-pole magnetized, 43 is S-pole magnetized, and 44 to 47.
Is a magnetic detector. For example, when the magnetization interval is 100 μm, four magnetic detectors are arranged at an interval of 25 μm. In this way, four pulse waveforms having a phase difference of 45 deg can be obtained. Waveforms 1 to 4 in FIG. 6 are obtained waveforms. By inputting the four waveforms to the multiplication circuit 37, a waveform 5 of 4 times can be obtained. With the above configuration, it is possible to obtain a 2512 p / r reel motor in which the apparent number of magnetizations is quadrupled.

Next, by detecting the edge information of the waveform 5, it is possible to obtain a 5024p / r reel motor (not shown) which is increased to eight times.

The tacho pulse multiplying means need not be limited to the method described above.

Next, a drive circuit for the take-up reel motor 9 and the supply reel motor 3 will be described with reference to FIGS. 9 and 10.

In FIG. 9, 48 is an input terminal, 49 is a voltage drive circuit, 50 is an armature of a take-up reel motor, 51 is a supply reel motor, 52 is an input terminal, 53 is a current drive circuit, and 54 is a supply reel motor. The armature 55 is a supply reel motor. FIG. 10 is a diagram showing input / output characteristics of the voltage drive circuit and the current drive circuit.

Motor driving methods are roughly classified into a current driving method and a voltage driving method.

The embodiment of the present invention is characterized in that the take-up reel motor is of a voltage drive type and the supply reel motor is of a current drive type.

In the voltage driving method, a voltage Vtout applied to an armature 50 of a motor is output by a voltage Vt input to a voltage driving circuit 49, and the rotational angular velocity of the motor is uniquely determined by the value of Vtout. This is a driving method suitable for speed control of the motor. However, it is not suitable for controlling the torque of a motor.

On the other hand, the current driving method is a current driving circuit 5
The current Is flowing through the armature 54 of the motor is output according to the voltage Vs input to 3, and the generated torque of the motor is uniquely determined by the value of Is. This drive method is suitable for controlling the tension of the tape. However, it is not suitable for controlling the angular velocity of a motor.

The operation of the current driving method and the voltage driving method will be described below.

The take-up reel motor is driven by the input terminal 48.
, And the control voltage Vt is input to the voltage drive circuit 49. The output voltage Vtout of the voltage drive circuit 49 is proportional to the control voltage Vt, and a current flows through the armature 50 of the take-up reel motor to drive the motor. As an example, FIG. 10 shows the output voltage Vto with respect to the input voltage Vt.
4 shows the characteristics of ut.

On the other hand, for driving the supply reel motor, the control voltage Vs is input from the input terminal 52 and is input to the current drive circuit 53. The output current Is from the current drive circuit 53 is proportional to the control voltage Vs, and the current Is flows through the armature 54 of the supply reel motor to drive the mater. As an example, FIG. 10 shows a characteristic of the output current Is with respect to the input control voltage Vs.

Next, the tape running mechanism of the capstanless information recording / reproducing apparatus of the present invention will be described with reference to FIG.

In FIG. 8, reference numeral 60 denotes tape guides 1 and 6.
1 is a tension detector, 62 is a tape guide 2, 63 is a tape guide 3, 64 is a tape guide 4, 65 is a tape guide 5, 66 is a tape guide 6, and 67 is a tape guide 7, 6.
Numeral 8 is a tape rotation guide 8, 69 is a rotating drum, 70 is a supply reel, and 71 is a take-up reel.

[0131] As shown in FIG.
The tape is then transferred to the take-up reel 71 via the tape guides 1 to 8 and the tension detector 61.

In this embodiment, the tape tension on the drum is 10
In order to satisfy gf, it is necessary to set the winding tension of the winding reel and the supply tension of the supply reel.

The winding tension is at least 12 gf or more due to friction between the tape guide and the magnetic tape.
Limited to 40gf or less. On the other hand, by limiting the tape tension from the supply reel to at least 2 gf or more and 6 gf or less, the contact state between the rotary head and the tape can be optimized.

According to the above description, for example, the number of tape guides is eight, and one of the guides that rotates with the transfer of the tape is described. However, in the embodiment of the present invention,
The tape is constituted by at least 8 or more and 12 or less tape guides from the supply reel to the take-up reel, and the tape guide is limited to be constituted by at least one or more movable guides. With the above-described tape guide configuration, a mechanism most suitable for the capstanless tape transport can be configured.

Next, recording tape speed control in the embodiment of the present invention will be described with reference to FIG.
11, the description of the same functional blocks as those in FIG. 1 is omitted here. In FIG. 11, 57 is an integrator, and 55 is an adder.

In order to control the rotational angular velocity of the take-up reel with high accuracy, position control (hereinafter referred to as integral control) is generally required in addition to angular velocity control. Conventionally, for example, the phase error information between a frequency-divided tach pulse obtained by dividing a capstan tach pulse indicating the rotation angular velocity of a capstan and a reference signal having the same cycle as the frequency-divided tach pulse is used as the integration output signal, Had been added. However, in the embodiment of the present invention, the conventional method cannot be applied because the tacho pulse of the reel changes according to the tape winding radius of the take-up reel.

Therefore, in the embodiment of the present invention, the signal from the speed controller 12 is sequentially accumulated by the integrator 57, and the integrated signal is substituted by the adder 55 for the speed control of the speed controller 12 instead of the integrated signal. The signal is added to the signal and sent to the motor driver 11.

The integrator can be realized by, for example, a digital filter and operating so as to sequentially accumulate the speed error signals.

[0139]

As described above, according to the present invention, the 3.5-inch half-height size, that is, the outer shape is almost
1.6mm, height dimension is almost 41.3mm, depth dimension is about 158.2mm
There is an effect that can be stored in the size of.

[Brief description of the drawings]

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

FIG. 2 is a top view of the reel motor.

FIG. 3 is a side view of the reel motor.

FIG. 4 is a diagram showing a rotation frequency detection mechanism of a reel motor.

FIG. 5 is a diagram showing a magnetization rate multiplication mechanism of a reel motor.

FIG. 6 is an operation waveform diagram of a magnetization rate multiplying mechanism of the reel motor.

FIG. 7 is a characteristic diagram of a take-up reel motor and a supply reel motor.

FIG. 8 is a diagram showing a tape transport of the capstanless information signal recording / reproducing apparatus.

FIG. 9 is a diagram showing a drive configuration of a reel motor.

FIG. 10 is a diagram showing input / output characteristics of a reel motor.

FIG. 11 is a block diagram showing a second embodiment of the present invention.

[Explanation of symbols]

 1. Supply reel 2. Reel base 3. Supply reel motor 4. Angular velocity detector 5. Motor driver 6. Tension controller 7. Take-up reel 9. Take-up reel motor 12. Speed controller 15,16. Rotary recording / playback head 19. Playback circuit 20. Recording circuit 21. Tension detector 22. Drum 23. Tape winding amount detector 24. Tape speed detector 49. Voltage drive circuit 50. Current drive circuit 55. Adder 57. Integration vessel

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Seiki Imagawa 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture, Japan Multimedia Systems Development Division, Hitachi, Ltd.

Claims (44)

[Claims] 1. A tape cassette in which a magnetic tape is wound around two reels is used. The magnetic tape is loaded on a rotary drum having a rotary head and runs at a predetermined speed. An information signal recording / reproducing apparatus in which a signal is recorded on the magnetic tape or a signal is reproduced from the magnetic tape, wherein a supply reel base on which the supply reel is fitted, and the take-up reel are fitted. A take-up reel base, a supply reel driving means connected to the supply reel base coaxially with a rotation axis thereof, and configured to rotationally drive the supply reel base, and coaxial with the take-up reel base and the rotation axis thereof. And a take-up reel driving means for rotating the take-up reel base. The capstan motor for running the magnetic tape is not mounted. Both the magnetic tape, the supply reel drive means and the information signal recording and reproducing apparatus characterized by comprising been traveling is driven by the take-up reel driving means. 2. An information signal recording / reproducing apparatus according to claim 1, wherein said first detecting means detects a rotational angular velocity of said supply reel driving means, and said second detecting means detects a rotational angular velocity of said take-up reel driving means. Detecting means; third detecting means for detecting a total winding amount of the magnetic tape from an output result of the first detecting means and an output result of the second detecting means; and an output of the first detecting means. And fourth detection means for detecting the running speed of the tape based on the output of the second detection means and the output of the third detection means, and the winding based on the output of the fourth detection means. Magnetic tape speed control means for controlling a rotation angular speed of a reel motor; means for sending an output signal of the magnetic tape speed control means to the take-up reel driving means; and arrangement between the supply reel and the recording / reproducing unit. Theta Tension detecting means, based on the output of the tape tension detection, a tension control means for sending a tension control signal to the supply reel driving means so that the tape has a predetermined tension,
An information signal recording / reproducing apparatus comprising: 3. An information signal recording / reproducing apparatus according to claim 2, wherein said supply reel motor and said take-up reel motor have a rotating part diameter of 30 mm or more and 47 mm or less. Recording and playback device. 4. A capstanless information signal recording / reproducing apparatus according to claim 2, wherein a diameter of a rotating portion of said supply reel motor and said take-up reel motor is not less than 38 mm and not more than 42 mm. Information signal recording and reproducing device. 5. An information signal recording / reproducing apparatus according to claim 2, wherein said supply reel motor and said take-up reel motor each have a rotating part diameter of approximately 40 mm. . 6. The information signal recording / reproducing apparatus according to claim 2, wherein a center distance between the take-up reel motor and the supply reel motor is located at 46.2 mm ± 3 mm. Signal recording / reproducing device. 7. The information signal recording / reproducing apparatus according to claim 2, wherein a center distance between the take-up reel motor and the supply reel motor is 46.2 mm ± 1.5 mm. apparatus. 8. The information signal recording / reproducing apparatus according to claim 2, wherein a center distance between the take-up reel motor and the supply reel motor is approximately 46.2 mm. 9. The information signal recording / reproducing apparatus according to claim 2, further comprising: means for mounting the take-up reel motor and the supply reel motor on a base, wherein one side of the base is 80 mm or more and 110 mm or less. An information signal recording / reproducing apparatus, wherein the other side has a length of 60 mm or more and 90 mm or less. 10. The information signal recording / reproducing apparatus according to claim 2, further comprising: means for mounting the take-up reel motor and the supply reel motor on a base, wherein one side of the base is 90 mm or more and 100 mm or less. An information signal recording / reproducing device, wherein the other side has a length of 70 mm or more and 80 mm or less. 11. The information signal recording / reproducing apparatus according to claim 2, further comprising: means for mounting the take-up reel motor and the supply reel motor on a base, wherein one side of the base is approximately 95 mm and the other side is approximately 95 mm. An information signal recording / reproducing apparatus characterized in that one side of the information signal is approximately 75 mm. 12. The information signal recording / reproducing apparatus according to claim 2, wherein a height dimension of the take-up reel motor and the supply reel motor with respect to the lower surface of the base is set to be 15 mm or more and 23 mm or less. An information signal recording / reproducing apparatus characterized by the above-mentioned. 13. The information signal recording / reproducing apparatus according to claim 2, wherein the height dimension of the take-up reel motor and the supply reel motor is 17 mm or more and 21 mm or less with the lower surface of the base as a reference plane. An information signal recording / reproducing apparatus characterized by the above-mentioned. 14. The information signal recording / reproducing apparatus according to claim 2, wherein a height dimension of the take-up reel motor and the supply reel motor is substantially 19 mm with the lower surface of the base as a reference plane. Information signal recording and reproducing apparatus. 15. The information signal recording / reproducing apparatus according to claim 2, wherein the both reel bases are located at a distance of 5 from a rotating section of the both reel motors.
An information signal recording / reproducing apparatus characterized by being located at a height of not less than 8 mm and not more than 8 mm. 16. The information signal recording / reproducing apparatus according to claim 2, wherein said both reel bases are 6 m from a rotating portion of said both reel motors.
An information signal recording / reproducing apparatus characterized by being located at a height of at least m and at most 7 mm. 17. An information signal recording / reproducing apparatus according to claim 2, wherein said both reel bases are located at a height of approximately 6.5 mm from a rotating portion of said both reel motors. Playback device. 18. An information signal recording / reproducing apparatus according to claim 2, wherein said first detecting means for detecting a rotational angular velocity of said supply reel motor and said second detecting means for detecting a rotational angular velocity of said take-up reel motor are provided. And a dividing section that divides the entire circumference of the rotating section of the two reel motors into 470 or more and 738 or less, and further, frequency generating means for detecting the dividing section, and multiplying the frequency of the take-up reel. And an information signal recording / reproducing apparatus. 19. An information signal recording / reproducing apparatus according to claim 2, wherein said first detecting means for detecting a rotational angular velocity of said supply reel motor and said second detecting means for detecting a rotational angular velocity of said take-up reel motor are provided. And a dividing unit that divides the entire circumference of the rotating unit of the two reel motors into 595 or more and 600 or less, further, frequency generating means for detecting the dividing unit, and multiplying the frequency of the take-up reel. And an information signal recording / reproducing apparatus. 20. The information signal recording / reproducing apparatus according to claim 2, wherein the first detecting means for detecting the rotational angular velocity of the supply reel motor and the second detecting means for detecting the rotational angular velocity of the take-up reel motor are provided. A dividing unit that divides the entire circumference of the rotating unit of the two reel motors into approximately 628, a frequency generating unit that detects the dividing unit, and a unit that multiplies the frequency of the take-up reel. An information signal recording / reproducing apparatus characterized by comprising: 21. The information signal recording / reproducing apparatus according to claim 2, wherein a torque constant as a torque generating capability of the take-up reel motor is configured to be 200 gcm / A or more and 500 gcm / A or less. Information signal recording / reproducing device. 22. The information signal recording / reproducing apparatus according to claim 2, wherein the take-up reel motor has a torque constant of 260 gcm / A or more and 450 gcm / A or less. Information signal recording / reproducing device. 23. The information signal recording / reproducing apparatus according to claim 2, wherein a torque constant as a torque generating capability of the take-up reel motor is configured to be approximately 320 gcm / A. apparatus. 24. The information signal recording / reproducing apparatus according to claim 2, wherein a torque constant as a torque generating ability of the supply reel motor is configured to be 50 gcm / A or more and 200 gcm / A or less. Signal recording / reproducing device. 25. The information signal recording / reproducing apparatus according to claim 2, wherein a torque constant as a torque generating capability of the supply reel motor is configured to be 70 gcm / A or more and 180 gcm / A or less. Signal recording / reproducing device. 26. The information signal recording / reproducing apparatus according to claim 2, wherein a torque constant as a torque generating ability of the supply reel motor is configured to be approximately 100 gcm / A. . 27. An information signal recording / reproducing apparatus according to claim 2, wherein said take-up reel motor and said supply reel motor have an inertial mass of 0.05 gcms2 or more and 0.24 gcms2 or less. Recording and playback device. 28. The information signal recording / reproducing apparatus according to claim 2, wherein said take-up reel motor and said supply reel motor have an inertial mass of 0.10 gcms2 or more and 0.20 gcms2 or less. Recording and playback device. 29. An information signal recording / reproducing apparatus according to claim 2, wherein said take-up reel motor and said supply reel motor have an inertial mass of approximately 1.15 gcms2. . 30. The information signal recording / reproducing apparatus according to claim 2, wherein the steady loss torque of the supply reel motor is 1 gcm or more and 4 g or more.
An information signal recording / reproducing apparatus characterized in that the information signal recording / reproducing apparatus is configured to be not more than cm. 31. The information signal recording / reproducing apparatus according to claim 2, wherein a steady loss torque of the supply reel motor is 1.5 gcm or more.
An information signal recording / reproducing apparatus characterized in that the information signal recording / reproducing apparatus is configured to be 3 gcm or less. 32. The information signal recording / reproducing apparatus according to claim 2, wherein a steady loss torque of the supply reel motor is approximately 2 gcm. 33. The information signal recording / reproducing apparatus according to claim 1, wherein the supply reel driving means changes a current value flowing to the supply reel motor based on a voltage value input to the supply reel driving means. Means, wherein the take-up reel drive means comprises voltage drive means for changing a voltage value applied to the take-up reel motor based on a voltage value inputted to the take-up reel drive means. Information signal recording and reproducing apparatus. 34. An information signal recording / reproducing apparatus according to claim 1, wherein a tape tension when said take-up reel winds said magnetic tape is configured to be 12 gf or more and 40 gf or less. Recording and playback device. 35. The information signal recording / reproducing apparatus according to claim 1, wherein a tape tension at a time when the take-up reel winds the magnetic tape is 12 gf or more and 30 gf or less. Recording and playback device. 36. An information signal recording / reproducing apparatus according to claim 1, wherein a tape tension when said take-up reel winds said magnetic tape is approximately 12 gf. apparatus. 37. The information signal recording / reproducing apparatus according to claim 1, wherein a tape tension when said supply reel supplies said magnetic tape is configured to be 2 gf or more and 6 gf or less. Information signal recording and reproducing device. 38. The information signal recording / reproducing apparatus according to claim 1, wherein the supply reel supplies the magnetic tape with a tape tension of 2 gf or more and 4 gf or less. Information signal recording and reproducing device. 39. The information signal recording / reproducing apparatus according to claim 1, wherein a tape tension when said supply reel supplies said magnetic tape is configured to be approximately 3 gf. Signal recording / reproducing device. 40. The information signal recording / reproducing apparatus according to claim 1, wherein 8 to 12 tape guides are provided between the supply reel and the take-up reel to guide the running of the magnetic tape. An information signal recording / reproducing apparatus, wherein at least one or more of the tape guides is configured as a movable guide. 41. The information signal recording / reproducing apparatus according to claim 1, wherein eight or more and ten or less tape guides for guiding the running of the magnetic tape are arranged between the supply reel and the take-up reel. An information signal recording / reproducing apparatus, wherein at least one or more of the tape guides is configured as a movable guide. 42. An information signal recording and reproducing apparatus according to claim 1, wherein said magnetic tape has a width of about 8 mm. 43. An information signal recording / reproducing apparatus according to claim 1, wherein: an integrating means for sequentially integrating an output result of said speed control means; an output result of said magnetic tape speed control means and an output result of said integrating means. An information signal recording / reproducing apparatus, comprising: an adding means for adding the information signal. 44. The information signal recording / reproducing apparatus according to claim 1, wherein the 3.5-inch half-height size, that is,
An information signal recording / reproducing apparatus characterized in that the information signal recording / reproducing apparatus can be accommodated in a size of about 101.6 mm in width, about 41.3 mm in height, and about 158.2 mm in depth.