JPH0325358Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a tape recorder, and particularly to a counter device that displays the running distance of a magnetic tape.

(b) Prior art Tape recorders are generally equipped with a counter device that displays the running distance of the magnetic tape, but there are two types of counter devices: mechanical ones and electronic ones. An example of such a device is disclosed in Japanese Patent Application Laid-Open No. 59-42680. In addition, in tape recorders that use commercial power as a power source, such as a tape recorder called a tape deck that is connected to an amplifier with a large output, it is possible to power the electric motor etc. even when the power switch is stopped. However, in portable tape recorders that use batteries as a power source, in order to prevent battery consumption, the electric motor is powered by a switch that is closed when each operation such as playback, fast forwarding, or rewinding is performed. The configuration is such that power is supplied to the devices, etc.

(c) Problems to be solved by the invention A portable tape recorder with a built-in electronic counter device has a counter other than a memory circuit that stores the count value of the counter circuit when, for example, a stop operation is performed from the playback state. The circuit is configured to cut off power supply to the circuit. Such a counter device is equipped with a pulse signal generation circuit that generates a pulse signal as the reel shaft rotates, but the pulse signal counting operation in such a device is configured to count the rising edge of the pulse signal. has been done. The pulse signal generation circuit is configured to output a pulse signal by shaping the waveform of a signal obtained from a switch that opens and closes as the reel shaft rotates. In such a pulse signal generating circuit, when the rotation of the reel shaft is stopped by a stop operation, the above-mentioned switch becomes either open or closed. When the switch is in either the open or closed state, an H (high) level signal is output, so a regeneration operation is performed from the stopped state and power is supplied to the counter circuit including the pulse signal generation circuit. If this occurs, a pulse signal will be output from the pulse signal generation circuit, and as a result, the same pulse signal will be counted twice, resulting in a count error. The present invention aims to provide a counter device that is improved in this respect.

(d) Means for Solving the Problems The counter device of the present invention includes a pulse signal generation circuit that generates a pulse signal as the reel shaft rotates, and a pulse signal from the pulse signal generation circuit is inputted. A counter circuit that counts up during playback and fast-forwarding operations and downcounts during rewinding operations, and a memory circuit that stores count values associated with the counting operations of the counter circuit and is constantly supplied with power. , a display that displays a count value accompanying the counting operation of the counter circuit, and a power supply that is closed when the tape recorder is in operation and supplies power to the pulse signal generation circuit, the counter circuit, and the display. The counter circuit is comprised of a switch and a delay circuit that delays the start of the counting operation of the counter circuit for a predetermined period of time when power is supplied upon closing of the power switch.

(E) Function The present invention counts pulse signals input as the reel shaft rotates using a power switch that is closed during playback, fast forwarding, and rewinding operations and is provided to supply power to an electric motor, etc. In addition to supplying power to the counter circuit, a delay circuit delays the start of the counting operation of the counter circuit.

(F) Embodiment The illustrated circuit is an embodiment of the counter device of the present invention. In the figure, 1 is a battery that is a power source;
2 is a power switch that is closed when playback, fast forwarding, and rewinding operations are performed and supplies power to an amplifier circuit (not shown); 3 is a motor that drives the magnetic tape; 4 is the power switch 2; This is a motor drive circuit that is supplied with power when the motor 3 is in a closed state and enters an operating state, and drives the motor 3 at a constant speed. Reference numeral 5 denotes a light emitting diode constituting the photocoupler 6 , whose anode is connected to a power supply line 8 via a resistor 7 and whose cathode is grounded. 9 is the photocoupler 6
It is a phototransistor that becomes conductive when the light emitted from the light emitting diode 5 is intermittently irradiated with the light emitted from the light emitting diode 5 when the reel shaft is in a rotating state, and the emitter is grounded and the collector is connected to resistors 10 and 11. It is connected to the power supply line 8 via the power supply line 8. Reference numeral 12 designates a switching transistor whose base potential is connected to be controlled by the phototransistor 9, whose emitter is connected to the power supply line 8 and whose collector is grounded via a resistor 13. The photocoupler 6 and the switching transistor 1
2 constitutes a pulse signal generation circuit 14 that generates a pulse signal in accordance with the rotation of the reel shaft.
Reference numeral 15 denotes a counter circuit which has an input terminal 16 to which a pulse signal obtained from the collector of the switching transistor 12 constituting the pulse signal generation circuit 14 is applied, and which counts the number of pulse signals applied to the input terminal 16. It is configured to count up when the control terminal 17 is not grounded, and to count down when the control terminal 17 is grounded.
Reference numeral 18 denotes a control switch connected between the control terminal 17 of the counter circuit 15 and the ground, and is opened when in the playback and fast-forward state, that is, when the magnetic tape is running in the positive direction, and when it is in the rewinding state, that is, when the magnetic tape is running in the positive direction. It is associated with a drive or operating mechanism to be closed when the direction is in the opposite direction. 19 is the power supply circuit 8 and the counter circuit 1
This delay circuit is connected between the power supply terminal 20 of the counter circuit 15 and the power supply terminal 20 of the counter circuit 15, and delays the power supply operation to the counter circuit 15 when the power switch 2 is closed, thereby starting the counting operation of the counter circuit 15. It has the effect of delaying the Reference numeral 21 denotes a memory circuit that stores the count value associated with the counting operation of the counter circuit 15 and is constantly supplied with power from the battery 1. Reference numeral 22 denotes a reset switch that resets the count value stored in the memory circuit 21. , 23 is a display that receives a signal corresponding to the up count value stored in the memory circuit 21 and displays the count value, and is configured so that power is supplied through the power switch 2. There is. Further, the counter circuit 15 is configured to count the rising edge of the pulse.

The counter device of the present invention is constructed as described above, and its operation will be explained next. The illustrated state is a stopped state, and the power switch 2 and control switch 18 are in an open state. In addition, in this state, power is supplied to the memory circuit 21 from the battery 1, and when the reset switch 22 is operated in this state, the memory circuit 21 is reset and its count value becomes zero. In such a state, when a regeneration operation is performed, the drive mechanism enters a regeneration state and the power switch 2 is closed. When the power switch 2 is closed, power is supplied to the motor drive circuit 4, and the motor drive circuit 4 becomes operational, and at the same time, power is supplied to an amplifier circuit (not shown), and the motor drive circuit 4 becomes operational.
When the motor drive circuit 4 is brought into operation, the electric motor 3 connected as a load is driven at a constant speed to drive the magnetic tape at a constant speed, and as a result, the tape recorder enters a playback operation state. Further, when the power switch 2 is closed, the pulse signal generating circuit 14 ,
Power is supplied to the counter circuit 15 and the display 23, and each circuit becomes operational. In the reproducing operation state, the phototransistor 9 is intermittently irradiated with light emitted from the light emitting diode 5 as the reel shaft rotates, so the phototransistor 9 repeatedly performs conductive and non-conductive operations. become. In addition, the phototransistor 9
When the phototransistor 9 is in a conductive state, the transistor 12 is biased into a conductive state, and when the phototransistor 9 is in a non-conductive state, it is reverse biased into a non-conductive state.
Therefore, when the reel shaft is in a rotating state, the switching transistor 12 repeatedly conducts conduction and non-conduction operations, and a pulse signal is output to the collector of the switching transistor 12. The pulse signal output to the collector of the switching transistor 12 is input to the input terminal 16 of the counter circuit 15 and is counted by the counter circuit 15, but when in the reproducing state, the control terminal 17 is in the non-grounded state. Therefore, the counter circuit 15 is in a state of up-counting. Therefore, the counter circuit 15 operates to count up the pulse signal output from the pulse signal generation circuit 14 as the reel shaft rotates.
The count value is input to the memory circuit 21 and stored therein, and the count is displayed on the display 23. Therefore, the user can recognize the running distance of the magnetic tape by checking the count value displayed on the display 23. In this manner, the counter device operates during the reproducing operation. Furthermore, the operation during the fast-forward operation is the same as that during the playback operation, although the rotational speed of the reel shaft is increased, so a description thereof will be omitted.

As described above, the operation when the magnetic tape runs in the forward direction is performed, but next, the operation when the magnetic tape runs in the reverse direction, that is, the rewinding operation will be explained. When the user performs a rewinding operation, the drive mechanism enters the rewinding state, and the power switch 2 and control switch 1 are turned on.
8 is closed. When the power switch 2 is closed, power is supplied to the motor drive circuit 4 and the motor 3
is rotated, so that the magnetic tape is rewinded. In such a rewinding operation state, the phototransistor 9 repeatedly conducts conduction and non-conduction operations as the reel shaft rotates, so that the collector of the switching transistor 12 is activated in the same way as in the above-mentioned reproducing operation. A pulse signal is output from the counter circuit 15, and the pulse signal is input to the input terminal 16 of the counter circuit 15. In this rewinding state, the control terminal 17 of the counter circuit 15 is grounded by closing the control switch 18, so that the counter circuit 15 is in a state of counting down. Therefore, the counter circuit 15 counts down the pulse signal output from the pulse signal generation circuit 14 as the reel shaft rotates, and the count value is input to the memory circuit 21 and stored, and the count value is will be displayed on the display 23. Therefore, the user can recognize the running distance of the magnetic tape by checking the count value displayed on the display 23.

As described above, the counter device operates during playback, fast-forwarding, and rewinding operations.Next, the operation at the start of the counter operation will be explained. First, a description will be given of the operation when the tape recorder is brought to a stopped state by a stop operation and the tape recorder is stopped in a state where the light from the light emitting diode 5 is not irradiated to the phototransistor 9.
When a reproducing operation is performed in such a state, the power switch 2 is closed and power is supplied to the pulse signal generating circuit 14 . When power is supplied to the pulse signal generating circuit 14 , the light emitting diode 5 constituting the photocoupler 6 emits light, but the light is not irradiated onto the phototransistor 9, so the phototransistor 9 is in a non-conducting state. Therefore, the switching transistor 12 controlled by the phototransistor 9 is in a non-conducting state, and the potential of its collector is at the L (low) level. Therefore,
In such a state, when the power is turned on, the counter circuit 15
Since a signal that rises to an H (higher) level than an L level is never input to the input terminal 16 of the input terminal 16, a count error does not occur. light emitting diode 5
The operation is as described above when the regeneration operation is performed when the phototransistor 9 is not irradiated with light from the light emitting diode 5. The operation when the system stops is explained below. When a reproducing operation is performed in such a state, the power switch 2 is closed and power is supplied to the pulse signal generating circuit 14 . When power is supplied to the pulse signal generating circuit 14 , the light emitting diode 5 constituting the photocoupler 6 emits light, and the light is irradiated onto the phototransistor 9, so that the phototransistor 9 becomes conductive. a switching transistor 12 controlled by the phototransistor 9 when the phototransistor 9 becomes conductive;
becomes conductive, and an H level signal is output to its collector. Therefore, when the power is turned on, a signal rising from the L level to the H level is input to the input terminal 16 of the counter circuit 15. However, when the power is turned on, the operation of supplying power to the power terminal 20 of the counter circuit 15 is delayed due to the action of the delay circuit 19.
5 is delayed by a predetermined period of time, and as a result, the counter circuit 15 does not count the signal that rises to the H level upon power-on. Therefore, even if the reproduction operation is performed in such a state, that is, in a state in which the light from the light emitting diode 5 is irradiated onto the phototransistor 9, a count error will not occur in the number counted by the counter circuit 15. Further, although the case where a reproduction operation is performed has been described, a count error does not occur even when a fast-forwarding or rewinding operation is performed.

Each operation in this embodiment is performed as described above, but when the power switch 2 is opened by the stop operation, the pulse signal generation circuit 14 and the counter circuit 1
5 and the display 23 are cut off, and each circuit becomes inactive. On the other hand, since the memory circuit 21 that stores the count value of the counter circuit 15 is constantly supplied with power from the battery 1, the count value remains stored as is.

In this embodiment, a photocoupler is used as a means for obtaining a pulse signal accompanying the rotation of the reel shaft, but it is also possible to use the opening/closing operation of a reed switch or the like.

(g) Effect of the invention The counter device of the invention supplies power to the pulse signal generation circuit and the counter circuit by a switch that is closed when each operation such as playback, fast forwarding, rewinding, etc. is performed. With this structure, it is possible to prevent counting errors in the electronic counter device, and its practical value is very great.

[Brief explanation of the drawing]

The illustrated circuit is one embodiment of the counter device of the present invention. Explanation of main drawing numbers, 1... Battery, 2... Power switch, 5... Light emitting diode, 6 ... Photo coupler, 9... Photo transistor, 12... Switching transistor, 14 ... Pulse signal generation circuit , 15...Counter circuit, 18...Control switch, 19...Delay circuit, 21...Memory circuit, 22...Reset switch, 23...Display device.

Claims (1)

[Scope of utility model registration request] A pulse signal generation circuit generates a pulse signal as the reel shaft rotates, and the pulse signal from the pulse signal generation circuit is inputted and counts up during playback and fast-forwarding operations, and counts down during rewinding operations. counter circuit,
A memory circuit that stores count values associated with the counting operation of the counter circuit and is constantly supplied with power, a display that displays the count values associated with the counting operation of the counter circuit, and a tape recorder. A power switch that is closed when the power supply switch is in an operating state and supplies power to the pulse signal generating circuit, the counter circuit, and the display, and a counting operation of the counter circuit when the power supply is supplied as the power switch is closed A tape recorder counter device comprising a delay circuit that delays the start by a predetermined period of time.