JPH024551Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a stereo playback device equipped with at least two signal sources, such as a tape recorder with a radio, and in particular, to a stereo playback device that is equipped with at least two signal sources, such as a tape recorder with a radio. This is a stereo playback device configured to perform the following functions, and its switching circuit can be configured to be compact.

<Prior Art> For example, there is a tape recorder with a radio that is configured so that a radio broadcast can be emitted from a speaker and the reproduced signal from the tape recorder can be listened to through headphones.

The configuration of this switching circuit is shown in FIG. In the figure, 1 is a radio receiving circuit, 2 is a tape recorder, 3 is a signal switching circuit, 4 is a power amplifier group, 5A and 5B are speakers, 6 is a stereo headphone jack, and 7 is a stereo headphone.

The signal switching circuit 3 includes switches S ₁ , S ₂ , S ₃ , S ₄ ,
It is composed of a total of eight switches: S ₅ , S ₆ , S ₇ , and S ₈ . Each of these switches has three contacts a, b, and c.
It is assumed that the movable contacts d all operate in conjunction with each other. When the movable contact d of each switch is in contact with the contact a, the stereo reproduction signal (which may not be stereo) output from the radio receiving circuit 1 is transmitted through the power amplifier group 4 to the speakers 5A and 5.
B is supplied. Therefore, the user can listen to radio broadcasts through the speakers 5A and 5B. Furthermore, by inserting stereo headphones 7 into the jack 6, radio broadcasts can be listened to through the stereo headphones 7.

When the movable contact d is brought into contact with the contact b, the stereo playback signal of the tape recorder 2 is switched to the switches S ₁ and S ₂
The outputs of the line amplifiers 8A and 8B are supplied through switches S ₃ and S ₄ and S ₅ and S ₆ , and further through the power amplifier group 4 to speakers 5A and 5B. Furthermore, by inserting the headphone 7 into the headphone jack 6, the reproduced signal from the tape recorder 2 can also be heard through the headphone 7.

When the movable contact d is switched to the state where it is in contact with the contact c, the switches S _{3 and 5} are connected to the speakers 5A and 5B.
A reproduction signal of the tape recorder 2 is applied through _S4 . Further, the stereo headphone jack 6 is supplied with a reception signal from the radio reception circuit 1 through switches _S5 and _S6 .

By switching the switches S ₁ to _{S 8} in this way, the stereo headphone jacks 5A and 5B are given a state in which the signal from the radio receiving circuit 1 is given (hereinafter this state is referred to as radio mode), and a state in which the signals from the radio receiving circuit 1 are given to the stereo headphone jacks 5A and 5B, and a state in which the signals from the tape recorder 2 are played back are changed. Switching between a state in which a signal is given (hereinafter referred to as tape mode) and a state in which each signal is given separately to tape recorder 2 and radio receiving circuit 1 (hereinafter referred to as dual mode). Can be done. Having this dual mode has the advantage that one tape recorder with radio can be used by two people at the same time for different purposes. Note that switches S ₁₁ and S ₁₂ indicate recording/reproduction changeover switches.

<Disadvantages of the Prior Art> As described above, when switching between the radio mode, tape mode, and dial mode, the switching circuit 3 is an 8-circuit, 3-contact switching switch. Since this 8-circuit, 3-contact changeover switch has a large number of circuits, only large-sized switches exist.

For this reason, conventional tape recorders with radios to which this switching circuit 3 can be added have a disadvantage that they are limited to those with relatively large cases.

In other words, in order to apply it to a small tape recorder exclusively for headphones, the switches S ₁ to
Since the _S8 is too large, it has the disadvantage that small tape recorders cannot be equipped with this switching function.

<Purpose of the invention> This invention is constructed so that a dual mode can be added to a small tape recorder.

<Summary of the invention> In this invention, the switching circuit 3 explained in FIG. The recorder is also configured so that the dual mode can be switched.

<Example of the invention> Fig. 2 shows an example of the invention. In FIG. 2, parts corresponding to those in FIG. 1 are designated by the same reference numerals.

In this invention, the switches constituting the switching circuit 3 are divided into two: main switches S ₁ , S ₂ , S ₃ , S ₄ , S ₇ , S ₈ and auxiliary switches S ₅ , S ₆ , S ₉ , S ₁₀ . These 2
The divided main switches S ₁ , S ₂ , S ₃ , S ₄ , S ₇ , and S ₈ and the auxiliary switches S ₅ , S ₆ , S ₉ , and S ₁₀ are each composed of two-contact type switches. Therefore, in this example, contact b becomes a movable contact. Main switch S ₁ , S ₂ ,
It is assumed that S ₃ , S ₄ , S ₇ , and S ₈ operate in conjunction with each other, and auxiliary switches S ₅ , S ₆ , S ₉ , and S ₁₀ also operate in conjunction with each other. Each switch is held at the switching position shown in FIG. 2 by the biasing force of a spring, and is switched by a lever mechanism as shown in FIG. 3 or 4, for example.

That is, in FIGS. 3 and 4, 11 is a switch case housing main switches S ₁ , S ₂ , S ₃ , S ₄ , S ₇ , S ₈ , and 12 is a switch case containing auxiliary switches S ₅ , S ₆ , S ₉ ，
Shows the switch case containing the S ₁₀ . Operators 11A and 12A protrude from switch cases 11 and 12, and a lever 13 is attached to these operators 11A and 12A.
engage. In the example of FIG. 3, the lever 13 is a rotating lever, and in the example of FIG.
This shows the case where is used as a sliding lever.

Each operator 11A, 12A is connected to cases 11 and 12.
It is assumed that biasing forces are applied in opposite directions in the directions of arrows A and B by a spring provided inside the housing.
Therefore, the two operators 11A and 12A are biased to opposite positions, and the operator 1 in that state
The lever 13 is sandwiched between 1A and 12A. Reference numeral 15 indicates a printed board, and the switch cases 11 and 12 are soldered to and supported by this printed board 15.

In the example shown in FIG. 3, if the lever 13 is rotated clockwise about the fulcrum 14, only the operator 11A can be moved in the opposite direction to the arrow A. A click hole 1 provided in the lever 13 when the operator 11A moves to the other end of the switch case 11
For example, a steel ball (not shown) engages 3A to maintain its operating position. Further, when the lever 13 is rotated counterclockwise, the steel ball engages with the click hole 13B, and the operating position is maintained by this click mechanism.

When the lever 13 is rotated clockwise, the main switches S ₁ , S ₂ , S ₃ , S ₄ , S ₇ , and S ₈ are switched from the state shown in FIG. 2 to the state in which they contact contact a. In this state, the power supply voltage is applied from the power supply 16 to the radio receiving circuit 1 through the switch _S8 , and the radio receiving circuit 1
operates, and the stereo playback signal output from the radio receiving circuit 1 is given to the two headphone jacks 6A, 6B through switches _S3 , _S4 and _S5 , _S6 , and radio broadcasting is performed by the two headphone jacks 7A, 7B. can be heard. Therefore, the rotational position of the lever 13 in this state will be referred to as the radio mode.

When the lever 13 is returned to its original position, the operator 11A is operated in the direction of arrow A by the force of its own return spring, and the switches S ₁ , S ₂ , S ₃ , S ₄ , S ₇ , and S ₈ are The state is changed to the state shown in FIG. 2, that is, the state in which the movable contact b is in contact with the contact c.

In this state, the power supply voltage is cut off to the radio receiving circuit 1, and the power supply voltage is applied from the power supply ₁₆ only to the tape recorder 2 through the switch S8, so that the tape recorder 2 becomes operational. At the same time, the stereo playback signal of tape recorder 2 is switched on.
The signals are applied to the power amplifier group 4 through S ₃ , S ₄ and S ₅ , S ₆ , amplified, and applied to two stereo headphone jacks 6A and 6B. Therefore, the stereo signal reproduced from the tape recorder 2 can be heard by the two stereo headphones 7A and 7B. Therefore, this switching position will be referred to as tape mode.

On the other hand, in this tape mode, when the lever 13 is rotated counterclockwise about the fulcrum 14, only the operator 12A moves in the opposite direction of the arrow B while the operator 11A remains in the same position. As a result, switches S ₅ , S ₆ , S ₉ , and S ₈ are brought into contact with contact point c.

When the switches S ₅ , S ₆ , S ₉ and S ₁₀ are in contact with the contact c, power supply voltage is applied to the radio receiving circuit 1 through the switches S ₉ and S ₇ , and the radio receiving circuit 1 becomes operable. Further, the power supply voltage is applied to the tape recorder 2 through the switches _S10 and _S8 , so that the tape recorder 2 is also in an operable state. Therefore, by operating the radio receiving circuit 1 and the tape recorder 2, a radio stereo signal outputted from the radio receiving circuit 1 is applied to the headphone jack 6B through the switches _S5 , _S6 and the power amplifier group 4. Further, the stereo reproduction signal from the tape recorder 2 is applied to the headphone jack 6A through switches S ₃ and S ₄ and the power amplifier group 4. Therefore, by inserting the headphone 7A into the headphone jack 6A, you can listen to the playback signal of the tape recorder 2 from the headphone 7A, and by inserting the headphone 7B into the headphone jack 6B, you can listen to radio broadcasts from the headphone 7B. Can be done.
Therefore, this switching position is called the dial mode.

In the case of FIG. 4, when the lever 13 is moved upward, it becomes the radio mode, when it is in the center position, it is the tape mode, and when it is moved downward, it is switched to the dial mode.

<Effects of the invention> As mentioned above, according to this invention, the switch can be switched to three modes: tape mode, radio mode, and dial mode using a 6-circuit, 2-contact type changeover switch and a 4-circuit, 2-contact type changeover switch. Circuit 3 can be configured. These 6-circuit, 2-contact type changeover switches and 4-circuit, 2-contact type changeover switches exist in shapes that are sufficiently smaller than the 8-circuit, 3-contact type changeover switches described above, so they can be used, for example, in small tape recorders exclusively for headphones. We can provide something with a dual mode. Therefore, it is possible to provide a small tape recorder that is small but has a large number of functions, and its effects are extremely large in practical use.

In the above description, the radio receiving circuit 1 and tape recorder 2 are used as signal sources, but it is easy to understand that the present invention can be applied to other signal sources such as a combination of a tape recorder and a record player, or a combination of a radio receiver and a record player. Good morning.

[Brief explanation of the drawing]

Figure 1 is a connection diagram to explain the switching circuit of a conventional tape recorder with dual mode.
The figure is a connection diagram for explaining the switching circuit according to this invention, and FIGS. 3 and 4 are perspective views for explaining the structure of the main part of this invention. 1... Radio receiving circuit, 2... Tape recorder, 3... Switching circuit, 4... Power amplifier group, 6
A, 6B... Headphone jack, 11, 12...
...Switch case, 11A, 12A...Operator.

Claims (1)

[Claims for Utility Model Registration] A. A stereo playback device equipped with two stereo signal sources and two stereo headphone jacks, B. Two fixed contacts to which stereo signals output from the two stereo signal sources are applied. a first movable contact that selects the stereo signal applied to these two fixed contacts and switches the selected stereo signal to one of the stereo headphone jacks;
a main switch equipped with an operator that converts the movable contact into the two fixed contacts, and a biasing spring that biases the operator to one switching position in a non-operated state; A fixed contact to which a signal is applied, a fixed contact to which a stereo signal of a signal source different from the stereo signal source selected by the main switch in the non-operated state is applied, and a stereo signal applied to these two fixed contacts. a second movable contact that selects and switches the second movable contact to the other stereo headphone; an operator that converts the second movable contact into two fixed contacts; D. an auxiliary switch equipped with a biasing spring that converts the switch into a fixed contact to which a stereo signal is applied, and biases the operator in a direction closer to the operator of the main switch in an inoperable state; an operating lever that is inserted between the respective operating elements of E and operates the main switch and the auxiliary switch separately against the biasing force of the spring; and a click mechanism that supports the operating position of the operating lever; This is a stereo playback device.