JPH0329785Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control circuit used when performing a so-called cueing operation in a magnetic recording/reproducing apparatus.

2. Description of the Related Art Some magnetic recording and reproducing devices, such as tape recorders and tape decks, have a function to locate the beginning of signals recorded on a magnetic tape. This cueing function is a function of detecting the start position and end position of a signal that is intermittently recorded on a magnetic tape at desired intervals. In conventional tape recorders and the like, the following two methods are used to perform cue operations.

The first method is to provide a key switch or review switch, turn it on, and then perform a fast forward or rewind operation to locate the top of the disc. The second method is to simultaneously turn on a playback switch and a fast-forward switch, or a playback switch and a rewind switch to perform the above-mentioned cueing. In order to carry out the first method, a control circuit configured as a special logic circuit is required, and a special key switch or review switch must be provided.

The second method described above can be carried out using a circuit configuration as shown in FIG. In other words, the IC (for example, MSM5836RS manufactured by Oki Electric Co., Ltd.), which is a semiconductor integrated circuit that constitutes the control circuit, has functions such as rewind (REW), fast forward (FF), playback (PLAY), and recording (REC). ), and control signal input terminals for temporarily stopping (PAUSE) are provided. Switches S ₁ , S ₂ , S ₃ , S ₄ , S ₅ and S ₆ are connected to each of the above input terminals in a corresponding manner. These switches
By switching S ₁ to _{S 6} to the on state, a control signal (voltage signal) is supplied to each of the above input terminals,
A desired mode can be selected.
On the other hand, this IC has output terminals T ₁ , T ₂ , T ₃ , T ₄ ,
A cassette mechanism 1 including a _plunger and a motor (both not shown) is connected to these terminals. In addition,
The AUTOSTOTOP input signal is for stopping the drive of the magnetic tape regardless of the mode of the tape recorder, V _cc indicates the power supply voltage, and in queue or review operation, fast forward or winding starts when cued. The return operation is canceled and the playback state is entered.

In the control circuit configured as above, when each switch S ₁ to S ₆ is selectively turned on, an output signal corresponding to the above switches S ₁ to _{S 6} is obtained from each output terminal T ₁ to _{T 5} . Based on this output signal, the plunger and motor operate to drive the cassette mechanism 1. Also, when cuing up,
Turn on switch S ₁ connected to the rewind (REW) control signal input terminal and switch S ₃ connected to the playback (PLAY) control signal input terminal at the same time, or turn on the fast forward (FF) control signal input terminal. Switch S ₂ connected to the input terminal and switch S ₃ connected to the playback (PLAY) control signal input terminal were turned on at the same time. For this reason, in the tape recorder of the conventional structure as described above, the cueing operation requires double effort, which is extremely inconvenient.

Therefore, the inventor of the present application combined the playback control signal input terminal and the rewind control signal input terminal of the semiconductor integrated circuit IC, and also combined the playback control signal input terminal and the fast-forward control signal input terminal, so that each combined input terminal We have focused on the fact that by supplying a control signal, cueing operations can be performed without using a particularly complex logic circuit, and have come up with the idea described below.

An embodiment of the control circuit of the present invention will be described below with reference to FIG. Note that since the semiconductor integrated circuit IC has the same functions as the conventional example, the explanation thereof will be omitted, and the illustration and explanation of Mechanism 1 will also be omitted. The switches _S3 to _S6 have the same structure as the switches described in the conventional example.

SW ₁ surrounded by the dotted line in Figure 2 is the first 2
SW 2 is a step-operated switch, and SW ₂ is a second
These are step-operated switches, each consisting of a so-called double-action switch. The first and second two-stage operation switches SW ₁ and SW ₂ are connected to a first opening/closing section 1 consisting of a first contact and a first movable contact.
stSW, and a second opening/closing part 2ndSW consisting of a second contact and a second movable contact. This first
Let A be the operating stroke of the opening/closing part 1stSW, and B be the operating stroke of the second opening/closing part 2ndSW, then the above strokes are configured to satisfy A<B.
Note that the first and second opening/closing parts 1stSW, 2
The movable contacts of the ndSW are each operated by the same operation unit (operation button). Therefore, by operating (for example, pushing) the operating part, the first opening/closing part 1stSW is first switched to the on state, and by further pushing the operating part, the second opening/closing part 2ndSW is turned on.
is switched to the on state. On the other hand, the first and second
When turning off the two-stage operation switches SW ₁ and SW ₂ , by operating (for example, pushing) the operation part, first the second opening/closing part 2ndSW is turned off, and then the first switch is turned off. The opening/closing part 1stSW is switched to the OFF state.

By connecting the first and second two-stage operation switches SW ₁ and SW ₂ having the above-described structure as shown in the figure, the above-mentioned cueing operation can be performed so easily as to be almost a one-touch operation.

That is, when the operating portion of the first two-step operation switch _SW1 is lightly pressed in the first step operation, first the first opening/closing portion 1stSW is switched to the on state. In this case, a control signal (voltage signal or so-called contact signal) is supplied only to the rewind (REW) control signal input terminal, and the tape recorder is switched to the rewind (REW) mode. Next, when the second stage operation is performed in which the operating part of the first two-stage operation switch SW ₁ is pushed in more than the first stage operation, the second opening/closing part 2
ndSW is switched on. in this case,
A control signal is simultaneously supplied to a rewind (REW) control signal input terminal and a playback (PLAY) control signal input terminal. Therefore, the tape recorder enters cue mode, ie, review operation.

Regarding the second two-step operation switch _SW2 , when the operation part is lightly pressed during the first stage operation, the first opening/closing part 1st SW is switched to the on state, and a control signal is sent to the fast forward (FF) control signal input terminal. When supplied, the tape recorder is switched to fast forward (FF) mode. Then, the second two-stage operating switch
If you perform the second step of pressing the operating part of SW ₂ more than the first step, the second opening/closing part 2nd SW
is switched to the on state. In this case, the control signal is simultaneously supplied to the fast forward (FF) control signal input terminal and the playback (PLAY) control signal input terminal. The tape recorder is therefore in cue mode or cue operation. Note that when only the playback (PLAY) mode is selected, switch _S3 is turned on. Additionally, if only STOP mode is selected, switch _S4 will switch to REC mode.
If only mode is selected, Switch S ₅
When PAUSE mode is selected, switch S ₆ is switched to the on state.

As described above, according to the present invention, a two-stage operation switch (double-action switch) is connected to the control signal input terminal of the control integrated circuit for selecting each mode of the magnetic recording and reproducing apparatus. By operating the operating section of the operating switch, cueing and playback modes can be selectively performed. Therefore, without using a control integrated circuit having a special function for cueing, signals recorded on a magnetic tape can be cued up by a simple switching operation that can be called almost one-touch.

[Brief explanation of the drawing]

FIG. 1 is a conventional cueing control circuit diagram of a magnetic recording/reproducing apparatus, and FIG. 2 is a cueing control circuit diagram of a magnetic recording/reproducing apparatus to which the present invention is applied. IC...control circuit, PLAY...playback control signal input terminal, REW...rewind control signal input terminal, FF
...Fast forward control signal input terminal, SW ₁ ...1st 2
Step operation switch, SW ₂ ...Second two-step operation switch, 1stSW...First opening/closing section, 2ndSW...
...Second opening/closing section, _S3 , _S4 , _S5 ...Switch.

Claims (1)

[Claims for Utility Model Registration] A control circuit comprising a semiconductor integrated circuit provided with control signal input terminals for rewinding, fast forwarding, and reproduction of a magnetic recording and reproducing device, and a first control circuit connected to the rewinding control signal input terminal. a first opening/closing part that is turned on by stepwise operation;
a first two-step operation switch comprising a second opening/closing section connected to the playback control signal input terminal and turned ON by the second-stage operation; and a second opening/closing section connected to the fast-forward control signal input terminal and turned ON by the second-stage operation; a first opening/closing part that is turned on by;
A second two-step operation switch comprising a second opening/closing section connected to the playback control signal input terminal and turned ON by a second-step operation. control circuit.