JP3685397B2 - Capstan motor for video tape recorder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the arrangement of motor drive circuits of a capstan motor, a drum motor, and a loading motor of a video tape recorder (hereinafter referred to as VTR) for a deck.
[0002]
[Prior art]
A configuration of a motor mounted on a conventional deck VTR and a motor driving circuit thereof are shown together with the drawings.
FIG. 7 shows a top view of a conventional capstan motor 3, and FIG. 8 shows a bottom view of FIG.
7 and 8, 1 is a rotor yoke, 2 is a capstan shaft, 7 is a rotor, 8 is a core, 9 is a coil, 10 is a drive magnet, 11 is a bearing holder, 13 is a thrust cap, 16 is a metal plate, 17A is a capstan printed circuit board, 23 is a capstan motor drive integrated circuit (below the heatsink and is not directly visible), and 25 is a pulley.
[0003]
As shown in FIGS. 7 and 8, a coil 9 is wound around the core 8, and a multi-pole magnetized drive magnet 10 is provided on the inner peripheral surface of the rotor yoke 1 that is opposed to the outer periphery of the core 8. Is provided.
The capstan shaft 2 passes through the bearing holder 11, and one end thereof is erected and fixed at the rotation center of the rotor yoke 1.
The capstan shaft 2 is rotatably held by a pair of sintered oil-impregnated bearings fitted and fixed to through holes provided at the upper and lower ends of the bearing holder 11, respectively.
When a drive current is applied to the coil 9 in this state, the rotor 7 fixing the drive magnet 10 is rotated by the magnetic interaction between the coil 9 and the drive magnet 10, and the capstan shaft 2 is rotated accordingly.
[0004]
The lower end side of the capstan shaft 2 passes through the rotor yoke 1, and the lower end thereof stands up at the rotation center of the pulley 25. The rotation center of the pulley 25 coincides with the rotation center of the rotor yoke 1.
The pulley 25 is provided for mounting a tape reel driving belt of the VTR.
[0005]
The capstan shaft 2 rotates at a rated rotational speed of 180 r / min (3 r / sec) during normal playback, but at a high speed search, it rotates at 1260 r / min (21 r / sec), which is 7 times the normal playback speed. Rotate by number.
Further, at the time of fast forward (FF) / rewind (REW), forward / reverse rotation is performed at a rotational speed of 4000 r / min (66.7 r / sec) in order to rotate the tape reel at a high speed.
[0006]
FIG. 6 is a block circuit diagram showing a circuit board on which a conventional video tape recorder capstan motor is mounted, a signal circuit board for a VTR deck, and a connection relationship between the motors.
As shown in FIG. 6, generally three types of capstan motor 3, drum motor 4, and loading motor 5 are used for the VTR.
As functions of each motor in the VTR, the capstan motor 3 drives the magnetic tape at a constant speed, the drum motor 4 drives the rotating magnetic head at a constant speed, and the loading motor 5 sets the tape cassette in and out of the video deck. Working.
A system for generating an optimum speed and torque is constructed for each of these motors by each motor drive circuit power supply and drive control signal supplied from the VTR circuit board 6A.
[0007]
The voltage (Vcc) of the drive circuit of the capstan motor 3 is 28V, and the voltages (Vcc) of the drive circuits of the drum motor 4 and loading motor 5 are 12V, respectively.
A circuit board 17A having a capstan motor drive circuit 23 is mounted on the capstan motor 3. However, the drive circuits for the drum motor 4 and the loading motor 5 are separated from the capstan printed circuit board 17A. It is incorporated in the deck (signal) circuit board 6A.
[0008]
And the drive circuit power supply of each motor and the control signal of the motor are output from the signal circuit board 6A for VTR decks.
The number of connecting lead wires is 8 between the capstan motor 3 and the VTR deck signal circuit board 6A, and between the drum motor 4 and the VTR deck signal circuit board 6A, including the control signal lead wires. 7 and two between the loading motor 5 and the signal circuit board 6A for the VTR deck.
[0009]
[Problems to be solved by the invention]
In FIG. 6, the drive circuit of the capstan motor 3A includes a capstan drive IC (23) incorporated in a printed circuit board 17A of the capstan motor 3A and other related electronic components.
The motor drive circuits of the drum motor 4 and the loading motor 5 are provided on the VTR deck signal circuit board 6A at different locations.
For this reason, since the motor drive current higher than the VTR signal level flows in the VTR deck signal circuit board 6A of FIG. 6 including ripples, the circuit pattern has a low VTR signal system circuit of several volts and its pattern 29. When the circuit through which the current of the motor drive circuit and the circuit pattern 30 are adjacently arranged, the VTR signal system circuit and the pattern 29 are affected, and the video recording / playback signal is adversely affected. There is.
[0010]
In addition, since the capstan motor drive circuit, drum motor drive circuit, and loading motor drive circuit have been separately integrated into an integrated circuit (IC) in the past, the unit price for three ICs and the number of mounting assembly steps are required separately. There is a problem that the total cost becomes high.
[0011]
The present invention has been made in view of the above problems. In particular, a circuit board integrated with a capstan motor includes a capstan motor drive circuit that generates a motor drive current to be supplied to a VTR capstan motor, and a VTR. A drum motor driving circuit for generating a motor driving current to be supplied to the drum motor for driving and a loading motor driving circuit for generating a motor driving current to be supplied to the loading motor for the VTR. By being supplied from outside the circuit board,
Alternatively, by mounting an integrated circuit in which the capstan motor driving circuit, the drum motor driving circuit, and the loading motor driving circuit are integrated, the video signal of the VTR circuit board is not adversely affected, and the assembly time of the IC is reduced. An object of the present invention is to provide a VTR capstan motor that can reduce the cost and cost.
[0012]
[Means for Solving the Problems]
In order to solve the above problems, the invention described in claim 1 is directed to a capstan motor (3) for a video tape recorder mounted on a video tape recorder including a drum motor (4) and a loading motor (5). Because
Capstan shaft (2) and the capstan shaft rotor (7) having a rotor yoke (1) formed by upright (2), rotatably supported motor base (19) and said capstan shaft (2) and a stator (15) having a bearing (22) to said motor base (19) is made in superposed metal plate circuit board (17) and (16), said circuit board (17), this a first drive circuit (26) for generating a capstan motor drive current supplied to the video tape recorder capstan motor (3), the drum motor (4) second generating a drum motor drive current supplied to the driving circuit (27), and having a third driving circuit and (28) for generating a loading motor driving current supplied to the loading motor (5), the drum motor Providing capstan motor for video tape recorder (3), characterized in that it has a dynamic current and a first output terminal for supplying the loading motor drive current to the outside, respectively (32) and a second output terminal (33) To do.
The invention described in claim 2 is the capstan motor for a video tape recorder described in claim 1,
A video comprising an integrated circuit (24) in which the first drive circuit (26), the second drive circuit (27), and the third drive circuit (28) are integrated together. A capstan motor (3) for a tape recorder is provided.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
A preferred embodiment of the VTR capstan motor according to the present invention will be described below with reference to the drawings.
FIG. 1 is a circuit board integrated with a VTR capstan motor of the present invention, a signal circuit board for a VTR deck, and a board connection layout diagram showing a connection relationship between the motors.
FIG. 2 is a half sectional side view of an embodiment of the capstan motor 3 of the present invention.
3 and 4 are a top view and a bottom view of an embodiment of the capstan motor of the present invention.
FIG. 5 is a block diagram showing a three-motor drive integrated circuit (IC) 24 of the present invention.
[0014]
1 to 4, 1 is a rotor yoke, 2 is a capstan shaft, 3 is a capstan (C) motor, 4 is a drum (D) motor, 5 is a loading (L) motor, and 6 is a signal for a VTR deck. Circuit board, 7 is a rotor, 8 is a core, 9 is a coil, 10 is a drive magnet, 11 is a bearing holder, 12 is an FG magnet, 13 is a thrust cap, 14 is an oil reflector, 15 is a stator, 16 is a metal plate, 17 Is a capstan printed circuit board, 20 is a Hall element, 21 is an MR element, 22 is a bearing, 24 is a three-motor drive integrated circuit (IC), and 25 is a pulley.
[0015]
As shown in FIG. 2, the stator 15 of the capstan motor 3 includes a motor base 19 in which a metal plate 16 made of iron or a silicon steel plate and a capstan printed circuit board 17 are stacked, and a capstan shaft 2. A bearing holder 11 that is rotatably held, a bearing 22, and a core 8 that is fastened together with the bearing 22 and the motor base 19 and is wound with a coil 9.
[0016]
On the other hand, the rotor 7 of the capstan motor 3 includes a capstan shaft 2, a rotor yoke 1, a drive magnet 10, an FG magnet 12, and a pulley 25.
Mounted on the capstan printed circuit board 17 are a Hall element 20 for detecting a rotational position and an MR element 21, which are electrical components that drive a voltage applied to the coil 9.
The MR element 21 reads a signal from a magnetized portion magnetized on the outer peripheral portion of the FG magnet 12, and generates a control signal for controlling the rotation of the capstan motor based on the read signal.
[0017]
In the block diagram of the three-motor driving integrated circuit (IC) shown in FIG. 5, the three-motor driving integrated circuit (IC) 24 mounted on the circuit board 17 integrated with the capstan motor 3 is a capstan motor driving circuit unit. 26, a drum motor drive circuit unit 27, and a loading motor drive circuit unit 28.
[0018]
The block configuration of the three-motor driving integrated circuit (IC) 24 is such that a capstan motor driving circuit unit 26, a drum motor driving circuit unit 27, and a loading motor driving circuit unit 28 are integrally arranged.
[0019]
In FIG. 1, an output terminal 32 of the drum motor driving circuit and an output terminal 33 of the loading motor driving circuit are arranged on the outer peripheral edge of the circuit board 17 on which the three-motor driving integrated circuit (IC) 24 is mounted.
The output terminal 32 is connected to the drum motor 4 by a lead wire (wire), and the output terminal 33 is connected to the loading motor 5 by a lead wire. These lead wires are not connected via the signal circuit board 6 for the VTR deck.
Further, the motor drive current generated by the capstan motor drive circuit unit 26 is directly supplied (connected) to the capstan motor 3, and it is not necessary to lead out the circuit board 17.
[0020]
Therefore, the motor drive current higher than the VTR signal level does not flow including ripples on the signal circuit board 6 for the VTR deck, and the circuit pattern is adjacent to the low VTR signal system circuit of several volts and the pattern. Since the circuit through which the current of the motor drive circuit flows and its circuit pattern are not arranged, the VTR signal system circuit and its pattern are not affected, and the video recording / reproducing signal is not adversely affected.
[0021]
Heat generated by the three-motor driving integrated circuit 24 mounted on the capstan printed circuit board 17 is superposed on the capstan printed circuit board 17 and is radiated through the metal plate 16 that also serves as a heat radiating plate.
[0022]
The three-motor drive integrated circuit (IC) 24 is composed of 48 pins except for the heat dissipation terminal. The capstan motor drive circuit unit 26 has a power supply (Vcc) terminal voltage of 28V and a drive control signal voltage of 2.5V to 3V.
In the drum motor drive circuit unit 27, the terminal voltage of the power source (Vcc) is 12V, which is the same voltage as the terminal voltage 12V of the power source (Vcc) of the loading motor drive circuit unit 28.
[0023]
The power supply and drive control signal voltage used in each of these motor drive circuit units are supplied from the power supply unit 34 of the VTR deck signal circuit board 6 to the capstan printed circuit board 17 at a predetermined voltage via lead wires.
[0024]
By using this three-motor driving integrated circuit (IC) 24, the output terminal of the drum motor driving circuit of the capstan printed circuit board 17 of the capstan motor 3 including the control signal lead wire from the signal circuit board 6 for the VTR deck. 7 to the drum motor 4 through 32, two to the loading motor 5 through the output terminal 33 of the loading motor drive circuit of the capstan printed circuit board 17 of the capstan motor 3, and the capstan print of the capstan motor 3 Twelve of the VTR deck signal circuit boards 6 are connected to the input terminal 31 of the board 17, respectively.
[0025]
There are 12 lead wires between the capstan motor 3 and the signal circuit board 6 for the VTR deck.
(1) For drum motor and loading motor power signal,
(2) For drum speed signal
(3) For drum motor control signal,
(4) More than 4 lead wires for loading motor control signal increase.
[0026]
【The invention's effect】
As described above, according to the invention of the capstan motor for a video tape recorder described in claim 1, since the drive circuits of the motors are collectively mounted on the capstan motor board, each drive of the drum motor and the loading motor is performed. The current flows through the VTR circuit board and does not adversely affect others, and the S / N of the recording / reproducing signal of the VTR equipped with the capstan motor of the present invention is improved.
[0028]
According to the invention of the capstan motor for a video tape recorder described in claim 2, the motor drive current does not flow through the VTR circuit board, and the S / N of the recording / reproducing signal of the VTR is improved. In addition, since the drive circuits of the capstan motor, drum motor, and loading motor are combined into one integrated circuit (IC), the number of assembly steps and the cost can be reduced .
[Brief description of the drawings]
FIG. 1 is a board connection layout diagram showing a capstan printed circuit board integrated with a VTR capstan motor of the present invention, a signal circuit board for a VTR deck, and a connection relationship between the motors.
FIG. 2 is a half sectional side view of an embodiment of a capstan motor for VTR of the present invention.
FIG. 3 is a top view of one embodiment of a VTR capstan motor of the present invention.
FIG. 4 is a bottom view of an embodiment of a VTR capstan motor of the present invention.
FIG. 5 is a diagram showing a block configuration of an embodiment of a three-motor driving integrated circuit (IC) mounted on a capstan printed circuit board formed integrally with a VTR capstan motor of the present invention.
FIG. 6 is a block circuit diagram showing a capstan printed circuit board on which a conventional VTR capstan motor is mounted, a signal circuit board for a VTR deck, and a connection relationship between the motors.
FIG. 7 is a top view of an example of a conventional VTR capstan motor.
FIG. 8 is a bottom view of an example of a conventional VTR capstan motor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotor yoke 2 Capstan shaft 3 Capstan motor 4 Drum motor 5 Loading motor 6 Signal circuit board for VTR (video tape recorder) deck 7 Rotor 8 Core 9 Coil 10 Drive magnet 11 Bearing holder 12 FG magnet 13 Thrust cap 14 Oil reflector 15 Stator 16 Metal plate 17 Capstan printed circuit board 19 Motor base 20 Hall element 21 MR element 22 Bearing 23 Capstan motor drive integrated circuit (IC)
24 Three-motor integrated circuit (IC)
25 Pulley 26 Capsule motor drive circuit unit 27 Drum motor drive circuit unit 28 Loading motor drive circuit unit 29 VTR signal system circuit and its pattern 30 Motor drive circuit and its pattern 31 Capsule board input terminal 32 Drum motor drive circuit output terminal 33 Output terminal of loading motor drive circuit 34 Power supply section

Claims (2)

A capstan motor for a video tape recorder mounted on a video tape recorder having a drum motor and a loading motor,
And a stator having a rotor having a rotor yoke which is formed by upright capstan shaft and the capstan shaft, a motor base and a bearing for rotatably supporting the capstan shaft,
The motor base is formed by superimposing a circuit board and a metal plate,
The circuit board is
A first driving circuit for generating a capstan motor drive current supplied to the video tape capstan motor recorder, a second driving circuit for generating a drum motor drive current supplied to the drum motor, the loading motor and having a third driving circuit for generating the loading motor driving current supplied, having a first output terminal and a second output terminal for supplying the drum motor driving current and the loading motor drive current to the outside, respectively Capstan motor for video tape recorders. The capstan motor for a video tape recorder according to claim 1,
A capstan motor for a video tape recorder, comprising an integrated circuit in which the first drive circuit, the second drive circuit, and the third drive circuit are integrated.

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