JPS6325546Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an electronic control means for the mechanism of a magnetic recording/reproducing device, and its purpose is to enable stop operation and eject operation to be activated by the same operation button. An object of the present invention is to provide a control circuit for a magnetic recording/reproducing device that can selectively perform operations according to the requirements.

Recently, many electronically controlled magnetic recording and reproducing devices have come onto the market because of their excellent operability.

However, in conventional devices, recording,
Selection of operation modes such as playback and rewind can be performed electronically with a light touch, but only the eject function to eject the cassette is performed mechanically, and therefore the eject operation button is significantly heavier than the other operation buttons and is difficult to operate. In my senses, it felt unbalanced.

This invention is intended to replace the manual eject operation with an electrical eject operation using a solenoid, and furthermore, the stop operation button is also used for ejecting.

Figure 1 shows the outline of the control circuit of a general magnetic recording/reproducing device. Therefore, a latch circuit that holds an electrical output for performing a predetermined operation, C is a logic circuit that generates an output that operates each part according to the output of this latch circuit B, and D is a solenoid that uses the output of this logic circuit C. This is a drive circuit for driving motors, display units, etc.

FIG. 2 shows the circuit configuration of an embodiment of this invention, and FIG. 3 is a timing chart showing the operation level of each part of the circuit in FIG.
1 becomes a low level when each operation such as recording, playback, rewinding, etc. a first monostable multivibrator circuit that serves as an output; 2 is a logic circuit (hereinafter referred to as an AND circuit) that takes the AND of the output from the first monostable multivibrator circuit and an inverter circuit described below;
3 is an inverter circuit for inverting the output of the latch circuit, and 4 is an inverter circuit for inverting the output of the above-mentioned latch circuit; 4, when the high-level output from the AND circuit is applied to the control terminal, a low-level input is made by operating the stop operation button (switch) described later. 5 is a drive circuit for an eject solenoid, 6 is a stop operation button (switch), and 7 is a display section.

Next, the operation of the above circuit will be explained. First, in the stopped state, as shown in FIG. level (hereinafter referred to as H level).

In this case, the output level is set so that the output of the monostable multivibrator circuit 1 is at H level, so the two inputs of AND circuit 2 are each at H level, and its output is at H level.

This output is applied to a control terminal that controls the operation and non-operation of the monostable multivibrator circuit 4, and in the case of the embodiment, it is assumed that the monostable multivibrator circuit 4 operates at H level and does not operate at L level.

Therefore, the monostable multivibrator circuit 4 is enabled to operate, and when the stop operation button 6 is pressed, the monostable multivibrator circuit 4 operates for a certain ejectable period t ₁ as shown in FIG.
An L level output is obtained, which activates the drive circuit 5 of the eject solenoid to perform the eject operation.

Next, when an operation such as recording, reproducing, or rewinding is being performed, the output from the latch circuit goes to H level and the output of the inverter circuit 3 goes to L level, so that the output of the AND circuit 2 goes to L level.

Therefore, the monostable multivibrator circuit 4 becomes inoperative and cannot perform an eject operation.

Next, when the stop operation button 6 is pressed to stop the above operation, the output of the latch circuit becomes L level, and the output of the inverter circuit 3 becomes H level at the same time as the stop operation, but the monostable multivibrator 4 Due to the operation of the stop operation button 6, the output of the AND circuit ₂ is at the L level for a certain period of time t2 due to the L level of the output of the monostable multivibrator 1 so as to eliminate this because it operates at the same time. After that, it becomes H level.

Therefore, at this time, the output becomes L level and cannot be ejected. Further, if the stop operation button 6 is held down, the eject operation is not performed even if the output of the AND circuit 2 becomes H level, and when the stop button 6 is pressed again, the eject operation is performed.

This is because the monostable multivibrator circuit 4 is configured to operate at the moment the input changes from H level to L level.

The reason for delaying the above output for a certain period of time _t2 is to prevent the eject operation from being performed before the mechanism is not completely stopped, and to prevent the eject operation from occurring if the stop operation button 6 is accidentally touched. This is to prevent eject operation. In addition, the display section 7 is for displaying that ejection is not possible, and is for displaying that the output of the AND circuit 2 is
By lighting it at the level, it is possible to visually notify the user that ejection is impossible.

In addition, the operation level in the above embodiment is shown as an example, and the operation level can be arbitrarily set according to the logic.

In addition, the latch circuit that is the input to the monostable multivibrator circuit 1 has one output in the embodiment, but when using a latch circuit without such an output, the output terminals of each operation of the latch circuit It is only necessary to obtain the OR logic of the necessary output from and add it to the monostable multivibrator circuit 1.

This invention is an electronically controlled magnetic recording and reproducing device that performs recording, reproducing, and
The first latch circuit output has a low level when each operation such as rewinding is stopped, and a high level when each operation is started, and the high level of the latch circuit output becomes low level for a predetermined period of time when the high level of the latch circuit output changes to low level by the stop operation. a monostable multivibrator circuit, an inverter circuit for inverting the output of the latch circuit, a logic circuit for ANDing the outputs from the first monostable multivibrator circuit and the inverter circuit, and a circuit for stopping or disabling each of the above operations. a stop operation switch that performs an eject operation when the stop operation is stopped;
A second monostable device in which when a high level output from the logic circuit is applied to the control terminal, a low level input is applied by operating the stop operation switch, so that the output becomes low level for a predetermined time. It consists of a multivibrator circuit and an eject drive circuit that performs an eject operation when the output of the second monostable multivibrator circuit is at a low level, and the stop operation and eject operation are selectively performed by the stop operation switch. By configuring the control circuit for the magnetic recording and reproducing device as described above, it is possible to perform both a stop operation and an eject operation with the same operation button, and moreover, when the magnetic recording and reproducing device is in operation, the stop operation can be performed. However, in a stopped state, an automatic operation selection is performed so that an eject operation is performed.

Furthermore, regardless of how the stop operation button is pressed, the eject operation is performed after a delay time until each operation is completely stopped, so there is no risk of damaging the drive mechanism of the apparatus, the tape, etc.

Furthermore, by using the stop and eject operation buttons, there is an advantage that the entire device can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the outline of a control circuit of a magnetic recording/reproducing apparatus, FIG. 2 is a circuit block diagram of an embodiment of this invention, and FIG. 3 is a timing chart showing the operating level of each circuit. 1...first monostable multivibrator circuit,
2...AND circuit, 3...Inverter circuit, 4...
...Second monostable multivibrator circuit, 5...
Eject solenoid drive circuit, 6...stop operation button (switch), 7...display section.

Claims (1)

[Scope of utility model registration request] In an electronically controlled magnetic recording and reproducing device, the high level of the latch circuit output, which becomes low level when each operation such as recording, playback, rewinding, etc. of the magnetic recording and reproducing device is stopped, and becomes high level when each operation is performed, stops. a first monostable multivibrator circuit that outputs a low level for a predetermined period of time when changed to a low level by operation; an inverter circuit for inverting the output of the latch circuit;
A logic circuit that takes the AND of the outputs from the monostable multivibrator circuit and the inverter circuit, a stop operation switch that stops each of the above operations or performs an eject operation at the time of the stop, and a high-level output from the logic circuit. a second monostable multivibrator circuit whose output becomes low level for a predetermined period of time when a low level input is applied by operating the stop operation switch when the voltage is applied to the control terminal; A magnetic device comprising an eject drive circuit that performs an eject operation when the output of the stable multivibrator circuit is at a low level, and configured so that the stop operation and the eject operation are selectively performed by the stop operation switch. Control circuit for recording/playback equipment.