JPH0574008A - Reel motor controller for tape player - Google Patents

Abstract

PURPOSE:To stably raise the rotation of a reel motor to the high speed state in a setting of high speed search mode. CONSTITUTION:An electric power to be supplied to a driving motor Ma or Mb is increased at a specified rate based on a driving signal of the high speed search mode, and also a reel rising control means 10 to changeover the increasing rate of electric power which is supplied to the reel driving motor based on an FG detection signal detecting the start of tape reel movement, and a reel stopping means 15 to supply a stopping force to the rotation of tape reel are provided. By providing a delay means 31, at this stage, the stop of reel movement made by the reel stopping means 15 is released before the driving power is supplied to the reel driving motor by the aforementioned reel rising control means 10. Thus, the reel rising control means 10, is prevented from the erroneous operation caused by the FG detecting signal which is effected at the time when the reel motor Ma or Mb is erroneously rotated by the stop release operation of the reel stopping means 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel motor controller for a VTR or DAT rotary head tape player, and more particularly to a reel stop means when a drive signal in a high speed search mode is issued. The present invention relates to a reel motor control device that prevents a reel start-up control circuit from malfunctioning due to a stop release operation.

[0002]

2. Description of the Related Art FIG. 5 is a circuit block diagram showing a reel motor control device in a conventional rotary head type tape player such as a DAT, and FIGS. 6A to 6E are parts of the reel motor control device shown in FIG. It is a diagram showing a signal of. In FIG. 5, reference numerals 1 and 2 are tape reels, around which the magnetic tape T is wound and stored in a cassette pack (not shown). Reference numerals 3 and 4 are reel stands, and the tape reels 1 and 2 are installed on the reel stands 3 and 4. Further, the reel bases 1 and 2 are provided with, for example, disks 2a and 3a on which a pattern (not shown) for optical rotation detection is formed so as to rotate integrally. And
The reel stands 3 and 4 have separate reel motors Ma and M.
driven by b.

The motors Ma and Mb have an FG
(Frequency Generator) Detector 5
And 6 are installed to detect the number of rotations of the motors Ma and Mb as a frequency. Code 1
A brake pad 5 is driven by the solenoid 14, and when the rotary head type tape player is in the stop mode, the brake pad 15 presses the outer peripheral surfaces of the disks 2a and 3a to bring the reel stands 3 and 4 into a stopped state. It is designed to hold. Reference numeral 16 is a solenoid driver, which supplies a drive current to the solenoid 14.

Reference numerals 7 and 8 are FG amplifiers, and
The FG signals detected from the G detectors 5 and 6 are output to the reel speed control unit 9 and the reel start-up control unit 10.
The reel speed control unit 9 outputs a speed control signal to the reel offset control unit 11 and the adder 12 so as to always maintain the reference rotation speed based on the FG signal. The reel start-up control section 10 controls the reel-off control of the control output for controlling the operation of the reel motors Ma and Mb from the start-up state to the high-speed stable state after the high-speed search mode signal is input based on the FG signal. It is output to the unit 11 and the adder 12.

Reference numeral 11 is a reel offset control section, which is based on signals from the reel speed control section 9 and the reel start-up control section 10 and which are the reel motors Ma and Mb.
Is output to the adder 12 for rotating the motor at a predetermined rotation speed. The adder 12
Is the sum of the motor control output from the reel offset control unit 11, the speed control output from the reel speed control unit 9 and the start control output from the reel start control unit 10 and is added to the reel motor driver 13 as an added output. Output.
The motor driver 13 outputs a motor drive current to the reel motors Ma and Mb based on the input addition output. Reference numeral 17 in the drawing is a main controller that controls the entire rotary head device. Reference numeral D is a rotary drum device equipped with a magnetic head.

Next, the control operation in the high speed search mode of the reel motor control device having the above construction will be described with reference to FIG. First, when a high-speed search mode signal (denoted as "switching signal" in the figure) 18 is input to the main control unit 17 (see FIG. 6A), the main control unit 17 controls the reel start-up. Control signals (operation start signals) 18a and 18b are output to the section 10, the reel motor driver 13, and the solenoid driver 16, and this state is held (see FIGS. 6B and 6C). When the control signals 18a and 18b are input, the solenoid driver 16 outputs a drive current to output the solenoid 14
Drive. As a result, the brake pad 15 is separated from the outer peripheral surfaces of the disks 2a and 3a, and the reel bases 3 and 4 (reels 1 and 2) are made rotatable.

At the same time, a drive current 21 is output from the reel motor driver 13 to start the reel motor Ma or Mb (see FIG. 6 (d)). Here, immediately after the reel start controller 10 gives a start output to the reel motor driver 13 and the reel motor driver 13 receives the operation start signal 18a, the reference numeral 21a in FIG. The drive current is controlled so as to be applied to the reel motor in which the current value increases at a relatively steep gradient as shown in FIG. The reel motor Ma or Mb starts rotating at a certain point due to the increase in the current value of the drive current 21a. When the reel motor starts rotating, the first FG signal 19 detected by the FG detector 5 or 6 is detected.
(See FIG. 6E) is input to the reel speed control unit 9 and the reel start-up control unit 10 via the FG amplifiers 7 and 8. In the reel start-up control unit 10, when the first FG signal 19 is obtained, the start-up output given to the reel motor driver 13 is switched, and the reel motor driver 13 outputs the reference numeral 21 in FIG. 6D.
As indicated by b, the drive current 21b whose current value increases due to the gentle gradient is output, and this is the reel motor Ma.
Or given to Mb. In FIG. 6D, the switching point of the drive current is indicated by P.

Thus, by switching the gradient of the drive current 21 from the reel motor driver 13 as indicated by 21a and 21b in accordance with the detection timing of the first FG signal 19, the tape running speed rises at the start of the high speed search mode. And the timing at which the rotary servo of the rotary head of the rotary drum device D stabilizes can be synchronized.

[0009]

However, in the conventional reel motor control device described above, the reel motor control signal 18a and the solenoid control signal 18 are supplied from the main control section 17.
Since b and b are output at the same time, the brake pad 15 is separated from the outer peripheral surfaces of the disks 2a and 3a at the same time when the start-up control of the reel motor is started.

However, when the brake pad 15 is separated from the disks 2a and 3a, the disks 2a and 3a may rotate at the same time as the brake pads 15 are separated from each other. Alternatively, if the tension of the tape T when the brake is applied is large, the reel base may rotate slightly due to this tension immediately after the brake pad is released. In such a case, since the motors Ma and Mb also rotate together, the FG signal 20 is generated before the original first FG signal 19 is generated at the time indicated by P by the rising control (Fig. 6 (e) is indicated by a chain line).

When this FG signal 20 is input to the reel start-up control section 10, the output of the motor driver at this point becomes a drive current whose current value increases with a gentle gradient as indicated by reference numeral 21b in FIG. 6 (d). It will be switched. As a result, it takes a long time for the reel motor Ma or Mb to rise to the original high rotation speed, and the rise in the high-speed search mode becomes extremely slow.

The present invention has been made to solve the above problems, and provides a reel motor control device for a tape player, which can bring the reel motor into a stable state at a high speed without causing a malfunction and can normally perform a high speed search. It is intended to be provided.

[0013]

A reel motor control device for a tape player according to the present invention increases a power supplied to a reel drive motor at a predetermined rate based on a drive signal in a high speed search mode and starts a tape reel. Reel motor control of a tape player, which is provided with reel start-up control means for switching the increase rate of electric power supplied to the reel drive motor based on a detection signal for detecting The apparatus is characterized in that means for releasing the reel stop by the reel stop means before the drive power is applied to the reel drive motor based on the reel start-up control means is provided.

Further, the reel motor control device of the tape player according to the present invention detects the start of the tape reel by increasing the power supplied to the reel drive motor at a predetermined rate based on the drive signal in the high speed search mode. In a reel motor control device of a tape player, which is provided with reel start-up control means for switching an increase rate of electric power supplied to the reel drive motor based on a signal and reel stop means for giving a stopping force to the rotation of the tape reel,
It is characterized in that means is provided for stopping the detection operation of the detection signal for a predetermined time after the drive power is supplied to the reel drive motor based on the reel start-up control means.

[0015]

In the first means, the reel stop by the reel stop means is released before the start-up control of the motor is started. Therefore, after the start-up control of the motor is started, the reel base and the reel motor are not accidentally started to rotate due to the stop release by the reel stop means,
It is possible to prevent the malfunction of the motor startup control from occurring due to the rotation detection.

In the second means, the rotation detection of the motor is stopped for a certain period of time immediately after the start-up control of the reel motor is started. Therefore, it is possible to prevent the startup control from malfunctioning due to incorrect rotation detection of the reel base after the startup control is started.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit block diagram showing an embodiment of a reel motor control device in a rotary head type tape player such as a DAT according to the present invention, and FIGS. 2A to 2E show the reel motor control device shown in FIG. It is a diagram which shows the signal of each part. Since the reel motor control device shown in FIG. 1 is almost the same as that shown in FIG. 5, its characteristic portions will be described, and the same members will be denoted by the same reference numerals and detailed description thereof will be omitted. In the reel motor control device shown in FIG. 1, the reel motor driver 13 is in the high speed search mode after a predetermined time has elapsed after the control signal 18b based on the high speed search mode signal 18 is input to the solenoid driver 16 (reel stopping means). A control signal 18a based on the signal 18 is input. In order to provide a time difference between the control signals 18a and 18b, the delay means 31 is provided in the path of the control signal 18a for starting the motor from the output control signals 18a and 18b from the main controller 17 in the embodiment of FIG. It is provided.
The means for providing the time difference between the control signals 18a and 18b may be a computer program in the main controller 17.

Next, the control operation of the reel motor control device will be described with reference to FIG. FIG. 2 shows the case of shifting from the stopped state to the high speed search mode. First, the high speed search mode signal 18 is sent to the main controller 1
7 (see FIG. 2 (a)), the main controller 1
7 to the solenoid driver 16 and the delay means 3
Control signals (operation start signals) 18a and 18b for 1
Is output. The control signal 18b is immediately input to the solenoid driver 16, but the input of the control signal 18a to the reel start-up control unit 10 and the reel motor driver 13 by the delay means 31 is delayed by a predetermined time t shown in FIG. When the control signal 18b is input, the solenoid driver 16 outputs a drive current to drive the solenoid 14. As a result, the brake pad 15 is separated from the outer peripheral surfaces of the disks 2a and 3a, and the reel bases 3 and 4 (reels 1 and 2) are rotatable.

Thereafter, after a lapse of a predetermined time (indicated by "t" in FIG. 2), the delay means 31 outputs a control signal 18b from the main controller 17 to the reel motor driver 13 ( FIG. 2C). Then, the reel motor driver 13 outputs a drive current (which is obtained by converting a supply voltage into a current) 21 to output the reel motor Ma.
And Mb are started (see FIG. 2 (d)). At this time, under the control of the reel start-up control unit 10, the reel motor driver 13 first outputs a drive current 21a whose current increases relatively steeply to the reel motor Ma or Mb.

The reel motor Ma or Mb starts to rotate due to an increase in the current value of the drive current 21a,
First FG signal 19 detected from G detector 5 or 6
When the reel speed control unit 9 and the reel start-up control unit 10 are input via the FG amplifiers 7 and 8 (see FIG. 2E), the reel start-up control unit 10 controls the timing. The reel motor driver 13 provides the reel motor Ma or Mb with a drive current 21b that increases in current with a gentle gradient. When this drive current 21b is output (the middle point P in FIG. 6D)
Indicates that the reel motor Ma or Mb gradually approaches high-speed stable rotation and reaches a predetermined rotation speed,
The reel speed control unit 9 brings about a stable rotation state.

According to this embodiment, the disks 2a and 3 are
Since the FG signal 20 generated when the discs 2a and 3a rotate due to the friction of the brake pad 15 and the tension of the tape T when separated from the outer peripheral surface of a is generated before the reel motor is started ( 2 (e) (indicated by a chain line in FIG. 2E), the reel start-up control unit 10 detects the first FG signal 19 at an appropriate time point P without malfunctioning, and drives the reel motor Ma or Mb. A control signal can be issued so that the high speed stable state is gradually achieved. Therefore, as shown in FIG. 6 (d), the output of the reel motor driver 13 is not fixed in a low state, the motor Ma or Mb is favorably brought into a stable state at high speed, and the high speed search mode is It is possible to prevent delay in stability.

Next, another embodiment of the present invention will be described. FIG. 3 is a circuit block diagram showing another embodiment of a reel motor control device in a rotary head type tape player such as a DAT according to the present invention, and FIGS. 4 (a) to 4 (e) are reel motor control devices shown in FIG. 3 is a diagram showing signals of respective parts of FIG. Since the reel motor control device shown in FIG. 3 is substantially the same as that shown in FIGS. 1 and 5, its characteristic portions will be described, and the same members will be denoted by the same reference numerals and detailed description thereof will be omitted. In the reel motor control device shown in FIG. 3, the control signal 1
After 8a and 18b are input to the solenoid driver 16 (reel stopping means) and the reel motor driver (or after the high speed search mode signal 18 is obtained),
Initial signal cutoff means 41 for cutting off the output signal output from the reel motor Ma or Mb to each control unit for a predetermined time.
Has been established. In the present embodiment, the initial signal blocking means 41 is provided behind the FG amplifiers 7 and 8, but it may be configured according to the computer program of the main controller 17.

Next, the control operation of the reel motor control device having the above construction will be described with reference to FIG. FIG. 4 also shows the case of shifting from the stopped state to the high speed search mode. First, the high speed search mode signal 18 is input to the main controller 17 (see FIG. 4A). Then, from the main control section 17, to the reel motor driver 13, the solenoid driver 16, and the initial signal cutoff means 41, control signals (operation start signals) 18a and 18b (the diagram of the initial signal cutoff means 41 are omitted. 4 (e)) is output and this state is held. (See FIGS. 4B and 4C). The control signal 1
When 8a and 18b are input, the solenoid driver 16 outputs a drive current to drive the solenoid 14. As a result, the brake pad 15 is separated from the outer peripheral surfaces of the disks 2a and 3a, and the reel bases 3 and 4 (reels 1 and 2) are rotatable.

Then, the reel motor driver 13
Outputs a drive current (converted from a supply voltage to a current) 21 to start the reel motor Ma or Mb (see FIG. 4 (d)). At this time, the reel start control unit 10 controls the drive signals of the reel motor driver 13 as indicated by 21a and 21b as described above. At this time, as described above, the control signal is output from the main control unit 17 to the initial signal blocking means 41. For this reason,
The initial signal blocking means 41, to which the control signal is input, outputs the FG signal (output signal) output from the reel motor Ma or Mb to the reel start-up controller 10 and the reel speed controller 9 for a predetermined time (FIG. 4 (e)). (Indicated by "t1" in step 1). The predetermined time t1 is equal to the reel motor M.
The first F when a or Mb starts to rotate due to the drive current
It is desirable to set so that the process is completed before the G signal 19 is output.

By the action of the initial signal cutoff means 41,
An FG signal 20 generated when the disks 2a and 3a rotate due to the friction of the brake pad 15 and the tension of the tape T when they are separated from the outer peripheral surfaces of the disks 2a and 3a.
Occurs within the predetermined time t1 and prevents the erroneous FG signal 20 from being input to the reel start-up control section 10 (shown by a chain line in FIG. 4 (e)). In this way, the reel start-up control unit 10 detects the first FG signal 19 without malfunctioning, and the reel motor M
A control signal is output so that a and Mb are gradually brought into a stable state at high speed.

[0026]

As described above, according to the present invention, the reel motor can be brought into a stable state at high speed without causing a malfunction, and it is possible to prevent the rise of the high speed search mode from being delayed.

[Brief description of drawings]

FIG. 1 is a circuit block diagram showing an embodiment of a reel motor control device in a rotary head type tape player such as a DAT according to the present invention.

2A to 2E are diagrams showing signals of respective parts of the reel motor control device shown in FIG.

FIG. 3 is a circuit block diagram showing another embodiment of the reel motor control device in the rotary head type tape player such as DAT according to the present invention.

4A to 4E are diagrams showing signals of respective parts of the reel motor control device shown in FIG.

FIG. 5 is a circuit block diagram showing a reel motor control device in a conventional rotary head type tape player such as DAT.

6A to 6E are diagrams showing signals of respective parts of the reel motor control device shown in FIG.

[Explanation of symbols]

 1, 2 Tape reel 3, 4 Reel stand 5, 6 FG detector 7, 8 FG amplifier 9 Reel speed control unit 10 Reel start-up control unit 11 Reel offset control unit 13 Reel motor driver 14 Solenoid (reel stop means) 15 Brake Pad (reel stop means) 16 Solenoid driver (reel stop means) 31 Delay means 41 Initial signal cutoff means

Claims (2)

[Claims] 1. An electric power supplied to a reel drive motor is increased at a predetermined rate based on a drive signal in a high speed search mode, and an electric power supplied to a reel drive motor is increased based on a detection signal for detecting that a tape reel is started. In a reel motor control device of a tape player, which is provided with reel start-up control means for switching the ratio and reel stop means for giving a stopping force to the rotation of the tape reel, a reel drive motor based on the reel start-up control means. A reel motor control device for a tape player, characterized in that means is provided for releasing the reel stop by the reel stop means before drive power is supplied. 2. The power supplied to the reel drive motor is increased at a predetermined rate based on the drive signal in the high speed search mode, and the power supplied to the reel drive motor is increased based on the detection signal for detecting that the tape reel is started. In a reel motor control device of a tape player, which is provided with reel start-up control means for switching the ratio and reel stop means for giving a stopping force to the rotation of the tape reel, a reel drive motor based on the reel start-up control means. A reel motor control device for a tape player, which is provided with means for stopping the detection operation of the detection signal for a predetermined time after the drive power is supplied.