JPS606898Y2 - tape recorder circuit - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tape recorder that can use magnetic tapes with different characteristics in an optimal state.

Currently, there are three types of magnetic tape in general use: normal tape, ferrichrome tape, and chrome tape, but recently a new magnetic tape called metal tape has been on the market.

Since each magnetic tape has different characteristics, it is necessary to change the recording equalizer etc. to match the characteristics of each magnetic tape.In high-grade tape recorders called tape decks, the recording equalizer etc. must be changed to suit the three types of tapes mentioned above. It has a switching function.

Comparing the aforementioned chrome tape and metal tape, although the sensitivity difference is different, the equalizer characteristics are similar to each other.

The present invention has been developed in view of these points, and will be described in detail below with reference to the drawings.

The illustrated circuit is one embodiment of the present invention.

In the figure, 1 is a current setting circuit that sets the amount of current of the recording signal applied to the recording head (not shown), and is used for normal tape, ferrichrome tape, chrome tape, etc.
and first, second, third, and fourth current setting circuits whose resistance values are determined according to the characteristics of the metal tape.2. 3.
The current setting circuit consists of 2.4 and 2. 3. 4
and 5, first, second, third, and fourth current setting circuit switching transistors 6, 7, 8, and 9 whose collectors and emitters are connected are inserted as signal paths.

10 is a frequency characteristic setting circuit for correcting the frequency characteristics, and the first, second and third frequencies are determined in accordance with the characteristics of normal tape, ferrichrome tape, chrome tape and metal tape. 11th second and third frequency characteristic setting circuit switching device consisting of characteristic setting circuits 11, 12 and 13, with collectors and emitters connected to the frequency characteristic setting circuits 11, 12 and 13 as signal paths; Transistors 14, 15 and 16 are inserted.

17, a control voltage is applied to a movable terminal 17a, and first, second, and third fixed terminals 17b, 17c, and 17d.
A first control switch 18 having a movable terminal 18a is connected to a third fixed terminal 17d of the first control switch 17, and first and second fixed terminals 18b, 18c.
A second control switch having a second control switch.

The first fixed terminal 17b of the first control switch 17 is connected to the bases of the switching transistor 6 for the first current setting circuit and the switching transistor 14 for the first frequency characteristic setting circuit, and the second fixed terminal 17c is connected to the base of the switching transistor 6 for the first current setting circuit and the switching transistor 14 for the first frequency characteristic setting circuit. Switching transistor 7 for setting circuit and switching transistor 1 for second frequency characteristic setting circuit
It is connected to the base of 5.

The first fixed terminal 18b of the second control switch 18 is connected to the third
connected to the base of the switching transistor 8 for the current setting circuit and the base of the switching transistor 16 for the third frequency characteristic setting circuit via the diode 19;
The second fixed terminal 18c is connected to the base of the switching transistor 9 for the fourth current setting circuit and the base of the switching transistor 16 for the third frequency characteristic setting circuit via the diode 20.

21 is a light emitting diode for display, the anode of which is connected to the second fixed terminal 18c of the second control switch 18 via a resistor 22, and the cathode of which is grounded.

The present invention is constructed as described above, and its operation will be explained next.

The illustrated state is a normal tube use state, and in this state, the switching transistor 6 for the first current setting circuit is connected through the first fixed terminal 17b of the first control switch 11.
A bias current is supplied to the base of the switching transistor 14 for the first frequency characteristic setting circuit, and the transistor 6.14 is turned on.

Therefore, the first current setting circuit 1 and the first frequency characteristic setting circuit 1
1 is in the operating state, and recording is performed in a state that matches the characteristics of the normal tape.

Further, when using ferrichrome tape, this is done by switching the first control switch 11 to the second fixed terminal 17c.

Furthermore, when using chrome tape, turn the first control switch 17 while leaving the second control switch
This is done by switching the terminal to the third fixed terminal 17d.

That is, in this state, the third fixed terminal 17d of the first control switch 17 and the first fixed terminal 18b of the second control switch 18
A bias current is supplied to the base of the third frequency characteristic setting circuit switching transistor 16 through the third current setting circuit switching transistor 8 and the diode 19, and the transistors 8 and 16 are in an on state.

Therefore, the third current setting circuit 4 and the third frequency characteristic setting circuit (2) are activated, and recording is performed in a state that matches the characteristics of the chrome tape.

As described above, switching is performed when using normal tape, ferrichrome tape, and chrome tape. Next, the case when using metal tape will be explained.

In this case, this is done by switching the second control switch 1 to the second fixed terminal 18c while keeping the first control switch 11 switched to the third fixed terminal 17d side.

That is, in this state, the power for the third frequency characteristic setting circuit is passed through the third fixed terminal 17d of the first control switch 11 and the second fixed terminal 18c of the second control switch, and the switching transistor 9 for the fourth current setting circuit and the diode 20. A bias current is supplied to the base of the switching transistor 16, turning the transistor 9.16 on.

Therefore, the fourth current setting circuit 1 and the third frequency characteristic setting circuit 13 are put into operation, and recording is performed in a state that matches the characteristics of the metal tape.

In addition, when this metal tape is used, the light emitting diode 21
turns on and lights up to indicate that the metal tape is in use.

In this embodiment, a case has been described in which a transistor is used as a switching element, but other elements such as a diode can be used.

As explained above, the present invention uses the frequency characteristic setting circuit for two magnetic tapes with different characteristics and the current setting circuit for each magnetic tape in the tape recorder, which simplifies the circuit configuration. Although four types of magnetic tapes are used, a three-contact switch is used, so it can be manufactured at low cost, and the practicality of the present invention is very high.

[Brief explanation of drawings]

The illustrated circuit is one embodiment of the present invention. Explanation of main drawing numbers, 1...Current setting circuit, 1o.
...Frequency characteristic setting circuit, 17...1st
Control switch, 18...Second control switch.

Claims (1)

[Scope of utility model registration request] In a tape recorder that can use four types of magnetic tapes with different characteristics, first, second, third, and fourth current settings set the amount of current of the recording signal applied to the recording head in accordance with each magnetic tape. circuit, first, second, and third frequency characteristic setting circuits for correcting frequency characteristics in accordance with the characteristics of each magnetic tape, and a first frequency characteristic setting circuit inserted in each of the current setting circuits.
, switching elements for second, third, and fourth current setting circuits, and a first switching element inserted in each of the frequency characteristic setting circuits.
A control voltage is applied to the second and third frequency characteristic setting circuit switching elements and the movable terminal, and the first,
a first control switch having second and third fixed terminals; and a second control switch having a movable terminal connected to the third fixed terminal of the first control switch and having first and second fixed terminals. More carefully, the first fixed terminal of the first control switch is connected to the control electrodes of the first current setting circuit switching element and the first frequency characteristic setting circuit switching element, and the second fixed terminal of the first control switch is connected to the control electrode of the first current setting circuit switching element and the first frequency characteristic setting circuit switching element. Connect the terminal to the second
The switch is connected to the control electrodes of the current setting circuit switching element and the second frequency characteristic setting circuit switching element, and the first fixed terminal of the second control switch is connected to the control electrode of the third current setting circuit switching element and the diode. is connected to the control electrode of the switching element for the third frequency characteristic setting circuit, and the second fixed terminal of the second control switch is connected to the third frequency through the control electrode of the switching element for the fourth current setting circuit and the diode. A tape recorder circuit, characterized in that it is connected to a control electrode of a switching element for a characteristic setting circuit.