JPH0799600B2 - Motor control circuit for tape recorder - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to motor on / off control of a tape recorder.

2. Description of the Related Art In recent years, in tape recorders, for example, in a tape recorder having two tape running systems, a continuous playback function for continuously running each tape running system by turning on / off a tape driving motor of each tape running system, etc. Has been realized.

An example of a conventional motor control circuit for a tape recorder will be described below with reference to the drawings.

FIG. 3 shows an example of a motor control circuit of a conventional tape recorder. In FIG. 3, 1 is a power supply terminal, 2 is a first switch element, which operates in conjunction with operation buttons for play, fast forward, rewind, etc. of a first tape running system 9 which will be described later. A switch element that closes when the button is pressed. Reference numeral 3 denotes a second switch element, which is a switch element that operates in conjunction with the fast-forward and rewind buttons of the first tape running system 9 and closes when the button is pressed. Reference numeral 4 denotes a motor control unit, which is composed of a fourth switch element 41, a reversing unit 42, and a second tape running system 43 which will be described later. Reference numeral 43 is a second tape running system, 41 is a fourth switch element, which operates in conjunction with operation buttons such as play, fast forward, and rewind of the second tape running system 43, and presses any button. Is a switch element that closes. Reference numeral 42 denotes an inversion unit, to which the voltage from the power supply terminal 1 is input via the fourth switch element 41. Reference numeral 5 is a first AND section, which is the output of the motor control section 4, that is, the output of the inverting section 42 and the first from the power supply terminal 1.
The voltage is input via the switch element 2. 6 is
This is an OR section, and the output of the first AND section 5 and the voltage from the power supply terminal 1 via the second switch element 3 are input.
Reference numeral 7 denotes a motor driving unit, which drives a motor 8 described later by the output signal of the OR unit 6. Reference numeral 9 is a first tape running system, and 8 is a motor, and the tape running of the first tape running system 9 is performed.

The operation of the motor control circuit configured as described above will be described below.

When the second traveling system 43 is stopped, the fourth switch element 41 is off because the button is not pressed, and the reversing unit 42
Is low, the output of the motor controller 4 is high. When the second traveling system 43 is in the play state or the like, the button is pressed, so the fourth switch element 41 is turned on,
Since the input of the inverting section 42 is high, the output of the motor control section 4 is low. When the second traveling system 43 is currently stopped,
That is, when the output of the motor control unit 4 is high and the first traveling system 9 is in the stopped state, the first switch element 2 is off and one input of the first AND unit 5 becomes low. Therefore, its output also goes low. At this time, since the second switch element 3 is also off, both inputs of the OR section 6 are low and their outputs are also low, so the motor is stopped. At this time, if the play button of the first traveling system 9 is pressed,
Since the first switch element 2 is turned on and the two inputs of the first AND section 5 become high, its output becomes high,
The motor 8 is rotated by the motor drive unit 7 through the OR unit 8 and the tape running of the first running system 9 is started.

Next, when the second tape running system 43 is in a play state, that is, when the output of the motor control unit 4 is low, even if the first running system 9 is in the play state, the first AND section 5 Since one input is always low, its output is always low and the motor 8 is stopped. That is, when the second traveling system 43 is in the play state, the first tape traveling system 9 is stopped even if the play button of the first traveling system 9 is pressed. At this time, when the second tape running system 43 automatically stops at the end of the tape, the first tape running system 9 starts running from there,
It is designed to perform continuous playback operation. On the other hand, when the second tape running system 43 is in the play state, the first tape running system 9 cannot be in the play state, but the fast forward / rewind button is pressed in response to the request for fast forward / rewind of the tape. When the second switch element 3 is turned on, the motor 8 is driven so that one input of the OR section 6 becomes high and its output becomes high, and fast forward / rewind can be performed. Is configured.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, when the above-described configuration is used for a traveling system configured to switch the traveling state of the tape traveling system by the driving force of the tape driving motor 8, the second tape traveling system is used. When the play button is pressed from the fast-forward / rewind state of the first tape running system 9 while the system 43 is in the play state, the fast-forward / rewind is canceled, so that the second switch element 3 is turned off and the motor 8 is turned on. Although stopped, the motor 8 continues to rotate for a while due to the inertia of the motor 8 and tries to switch the first tape running system 9 to the play state. At this time, if the motor 8 is stopped before the first running system 9 is completely in the play state, the running state switching of the first tape running system 9 is stopped in the middle of the switching, so that the first tape running system 9 is stopped. There is a problem that the operation buttons cannot be operated and the tape cannot be taken out.

In view of the above problems, the present invention allows the second tape running system 43 to operate when the second tape running system 43 is in the play state even when the play button is pressed from the fast forward / rewind state of the first tape running system 9. It is intended to provide a motor control circuit that does not stop during the switching of the traveling state.

Means for Solving the Problems In order to solve the above problems, the present invention detects that the second switch element interlocking with the fast-forward / rewind button of the first traveling system is turned off, and thereafter, for a certain period of time. During the output of the OFF detection holding unit for generating an output pulse during the OFF period, and the first switch element interlocked with the operation button of the first tape running system is turned ON, Set the output for driving the motor of the tape running system, and drive the motor by the flip-flop section which is reset by the third switch element which is turned on when the first tape running system is completely in the play state. It is configured.

Operation The present invention has the above-described configuration, and when the second tape running system is in the play state, the first tape running system presses the play button from the fast forward / rewind state to interlock with the fast forward / rewind button. If the first switch element that interlocks with the operation button is turned on before the switch element is turned off and the motor is stopped, the first switch element is turned on while the off detection holding unit is being output. When the first tape running system is in the play state and the play state is completely in play, the third switch element is turned on and the flip-flop section is reset and the motor is stopped. Therefore, it is possible to prevent the inconvenience that the first tape running system stops during the switching of the running state.

Embodiment A motor control circuit for a tape recorder according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a main part of a motor control circuit of a tape recorder according to an embodiment of the present invention. In FIG.
1 is a power supply terminal, 2 is a first switch element, 3 is a second switch element, 4 is a motor control section, 5 is a first AND section, 6
Is an OR section, 7 is a motor drive section, 8 is a motor, and 9 is a first tape running system, which is constructed in the same manner as the conventional example of FIG. Reference numeral 10 is a third switch element, which is a switch element which is opened / closed in association with the movement of the magnetic head substrate installed in the first tape running system 9 so that the first tape running system 9 is completely in a play state. Turn on when. Reference numeral 11 denotes an OFF detection holding unit, which is configured to detect that the second switch element 3 has been switched from ON to OFF, and thereafter output a high level for a certain period of time. Reference numeral 12 is a second AND section, which receives the output of the OFF detection holding section 11 and one end of the first switch element 2 which is not connected to the power supply terminal 1. Reference numeral 13 denotes a flip-flop unit, which is configured such that the output is set to high by the set input and the output is reset to low by the reset input. The set input is the output of the second AND unit 12 and the reset input is The output terminals are connected to the power supply terminals 1 via the third switch elements 10 and are input to the OR section 6.

The operation of the motor control circuit of the tape recorder configured as described above will be described below. When the output of the motor control unit 4 is high while the second tape running system is stopped, the motor 8 operates in response to the operation of the operation button of the first tape running system 9 as in the conventional example of FIG. . Even when the second tape running system is in the play state and the output of the motor control unit 4 is low, the operation is the same as in the conventional example of FIG. 3 and the first switch is operated by operating the operation button of the first tape running system 9. Even if the element 2 is opened / closed, the output of the first AND section 5 is always low, so the motor does not rotate, while the second switch element 3 is turned on when the fast forward / rewind button is pressed. The motor rotates to perform fast forward / rewind operation. At this time, when the fast forward / rewind button is released and the second switch element 3 is turned off, the motor 8 is stopped and the output of the off detection holding unit 11 becomes high for a certain period of time after the second switch element 3 is turned off. When the play button of the first tape running system 9 is pressed while the output of the off detection holding section 11 is high, the first switch element 2 is turned on and both inputs of the second AND section 12 are high. Therefore, the output becomes high, the flip-flop unit 13 is set, the output is input to the motor drive unit 7 through the OR unit 6, the motor 8 rotates, and the first tape running system 9 enters the play state. When the first tape running system 9 enters the play state, the third switch element 10 that opens and closes in conjunction with the movement of the magnetic head turns on and resets the flip-flop unit 13, so the output of the flip-flop unit 13 becomes low and the motor Will stop.

Here, while the output pulse of the off detection holding unit 11 is high, the second switch element 3 is turned off and the motor 8
Is set to a little longer than the time it takes for the motor 8 to turn off and the motor 8 to actually stop rotating. Therefore, the second
The switch element 3 of is turned off, the power of the motor 8 is turned off,
The play button is pressed while the motor 8 rotates due to inertia,
When the first switch element 2 is turned on, the flip-flop section 13 is always set and high is output, so that the motor 8
After turning the tape running system 9 to the completely play state, the third switch element 10 is turned on, the flip-flop unit 13 is reset, and the rotation of the motor 8 is stopped. on the other hand,
After the fast-forward / rewind button is released and the motor 8 is completely stopped, the play button is pressed after the output of the off detection holding unit 11 becomes low and the motor 8 is turned on even if the first switch element 2 is turned on.
Does not rotate and the drive mode is not changed. Further, since the output pulse time of the OFF detection holding unit 11 is set to be longer than the actual stop time of the motor 8, from the time when the motor 8 is completely stopped until the output of the OFF detection holding unit 11 becomes low. There may be a case where the play button is pressed on, but in this case as well, the output of the second AND section 12 outputs a high pulse for a moment, so the flip-flop section 13 is set and the first tape running system 9 The motor 8 is rotated until the third switch element 10 is turned on and the flip-flop unit 13 is reset in the completely play state, so that the first tape running system 9 is stopped during the mode transition. No serious problems occur.

FIG. 2 shows a change with time of the above operation.
In FIG. 2, (a) is the output signal of the first switch element 2, (b) is the output signal of the second switch element 3, (c).
Is the output signal of the motor control unit 4, and (d) is the first AND unit 5
Output signal, (e) is the output signal of the off detection holding unit 11,
(F) is the output signal of the flip-flop unit 13, (g) is the output signal of the third switch element 10, (h) is the output signal of the OR unit 6, and (h) is the output signal of the OR unit 6 in the conventional example. Output signal,
(I) represents the rotation speed of the motor 8. As shown in this figure, if the play button is pressed before the rotational speed (i) of the motor 8 reaches 0 after the fast-forward / rewind is released, the motor 8 is driven again and the first traveling system 9 Since the motor 8 is stopped after being completely in the play state, the running state of the first tape running system 9 does not stop during switching. Further, when the play button is pressed after the number of rotations (i) of the motor 8 becomes 0 after the fast-forwarding / rewinding which is a normal use state is released, the motor 8 does not rotate, that is,
Since the first tape running system 9 does not stop in a play state and does not come into contact with the capstan of the first tape running system 9 and the pinch roller, the pinch roller is deformed. Perform an operation that is less dangerous, such as

EFFECTS OF THE INVENTION As described above, according to the present invention, it is detected that the second switch element interlocking with the fast-forward / rewind button is turned off, and that the off-detection holding section holds the off-time for a certain period of time, and the off-detection holding section detects and holds the off-switch holding section. When the first switch element that interlocks with the operation button is turned on within a certain period of time, the rotation of the motor is started and the third switch element that operates in conjunction with the movement of the magnetic head is turned on. At this time, by providing a flip-flop portion for stopping the rotation of the motor, it is possible to prevent inconveniences such as the tape running system being stopped during the operation state switching and being unable to take out the tape. Is. Further, when the motor control circuit of these tape recorders is implemented by a microcomputer, the configuration of the present invention can be configured very easily.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main part of a motor control circuit of a tape recorder in one embodiment of the present invention, FIG. 2 is a waveform diagram showing a time course of operation in the embodiment of FIG. 1, and FIG.
The figure is a block diagram of a motor control circuit of a conventional tape recorder. 2 ... First switch element, 3 ... Second switch element, 4 ... Motor control section, 5 ... First AND section, 6 ... O
R part, 7 ... motor drive part, 9 ... first tape running system, 10 ... third switch element, 11 ... off detection holding part, 12 ... second AND part, 13 ... flip floc Section.

Claims (1)

[Claims] Claim: What is claimed is: 1. A tape running system for driving the running of a tape and a movement of a head substrate by a driving force of a motor;
Switch element, a second switch element that opens and closes in conjunction with the fast forward and rewind buttons of the tape running system, and a third switch element that opens and closes in conjunction with the movement of the recording / playback head installed in the tape running system. Of the switch element, the motor control section, the first AND section that receives the output of the motor control section and the open / close signal of the first switch element, and the open / close signal of the second switch element as input And an off-detection holding section that outputs an output signal only for a certain period of time after the rewind button is turned off, and a second AND section that receives the output of the off-detection holding section and the open / close signal of the first switch element. A flip-flop unit set by the output of the second AND unit and reset by an open / close signal of the third switch element, an output of the first AND unit, an open / close signal of the second switch element, Previous OR unit and the motor control circuit of the tape recorder, characterized in that said and a motor driving unit for driving the tape running system of the motor outputs of the OR portion as an input that receives the output of flip-flop unit.