JPS6020226Y2 - A small tape recorder with a detachable radio tuner. - Google Patents

Description

[Detailed description of the invention] This invention is a small tape recorder that detachably connects a radio tuner. Specifically, the invention utilizes an amplifier and a speaker inside the tape recorder, and connects a radio tuner circuit to the tape recorder. The present invention relates to a small tape recorder that constitutes a small tape recorder.

As is well known, a compact cassette tape recorder using a microcassette tape developed by the present applicant is constructed to be ultra-compact and can fit into a clothes or shirt pocket for convenient portability.

Additionally, accessory devices such as a radio tuner, a remote control device, and a voice activation device can be attached to and detached from the outside of the tape recorder, thereby expanding its range of use.

When the radio tuner in the attached device is combined to form a tape recorder with a radio, the amplification circuit and speaker in the electric circuit in the recorder are used, and the radio tuner circuit is connected to this. The radio is now configured.

The ultra-compact cassette tape recorder with a radio configured in this way is similar to the cassette tape recorder with a radio that uses large cassette tapes, and can operate only the tape recorder, operate only the radio, or play the tape while receiving radio broadcasts. It is possible to carry out the operation of reproducing, and the operation of turning the tape recorder into a recording state to receive and record radio broadcasts.

However, when recording radio broadcasts, the recording can only be monitored using the tape recorder's monitor earphones, and even though there are speakers,
This was not used and this point was very inconvenient.

The purpose of the present invention is to solve the above-mentioned drawbacks when a radio tuner is removably connected to an ultra-compact cassette tape recorder to make it an ultra-compact cassette tape recorder with a radio. A radio tuner that cleverly utilizes a switch opening/closing member that is linked to an operating button, and also provides a single normally open switch, allowing the speaker to operate as a monitor when recording radio broadcasts. The aim is to provide a compact tape recorder that can be attached and detached.

The present invention will be explained below with reference to an illustrated embodiment.

In this example, a case will be described in which an FM radio tuner is combined as the radio tuner.

As shown in FIGS. 1 and 2, the ultra-small cassette tape recorder 1 is provided with a cassette device chamber lid 3 having a viewing window 3a for viewing the cassette tape at the top of its top surface 1a.
This lid 3 is opened and closed by a hinge 4.

A speaker window 5 is provided below the hinge 4.

On the front 1b, there are operation buttons 7 for fast forwarding and rewinding the tape.
, a built-in microphone window 8, and a pause operation button 9 are arranged, and furthermore, on the upper part of the right side surface 1C, there are operation buttons 10at for recording, playing, and stopping the tape recorder.
10b and 10c, and an eject button 11 for opening the lid 3 and ejecting the cassette tape are provided on the left side surface 1d.

Further, a display member 6 for displaying the recording status and battery check is disposed near the lid 3 on the top surface 1a.

The back surface 1e of this tape recorder 1 serves as a connection surface for attached devices.

This coupling surface has a screw hole 12 into which a coupling screw for an accessory device is screwed, and a positioning groove 1 for coupling the accessory device.
3a, 13b and electrical circuit connection terminals 14a to 14g
and an AC adapter connection jack 15 are respectively provided.

The FM radio tuner L, which is detachably connected as an accessory device to the ultra-compact cassette tape recorder 1 configured in this way, has a radio operation operation button 16 and a tuning diana 19 on its top surface 2a. An indicator 20 and a radio operation display section 18 are respectively provided, and a radio tuning knob 21 is provided on the right side surface 2c.

Further, an antenna support member 23 is attached to the left side surface 2d, and a rod antenna 24 is supported by this.

A coupling screw (not shown) protrudes from the center of the coupling surface 2b opposite to the coupling surface of the tape recorder 1, and the positioning screw 113a is provided on the right and left sides of the coupling surface 2b.
, 13b, a positioning protrusion (not shown) that fits into the
Further below, there are electric circuit connection terminals 17a to 17a corresponding to the connection terminals 14a to 4g of the tape recorder 1.
7g (see FIG. 3) and a terminal 17h (see FIG. 3) which is connected to the body ground by the screw described above are provided.

The coupling surface screw is rotatably attached through the housing of the radio tuner 2, and its head 22a is located on the back surface 2e of the tuner.

The radio tuner 2 configured in this way has first and second
As shown in the figure, the coupling surface 2b of the tuner 2 is brought into contact with the back surface 1e of the tape recorder 1, the protrusions are fitted into the positioning grooves 13a and 13b, and then the coupling screw is tightened. The radio tuner 2 is connected to the tape recorder 1 as shown in FIG. 1 by screwing the screw into the screw hole 12.

When these are combined, the connection terminal 17a of the tuner 2
~17g are connection terminals 14a~ on the recorder, respectively.
14g, the electric circuit of the tuner 2 is connected to the electric circuit of the recorder 1.

At this time, since the connection terminal 17h of the radio tuner 2 and the electric circuit connection terminal 14h of the tape recorder 1 are shared by a body-earthed coupling screw, the earth of both electric circuits is formed in common. .

After connecting in this way, the radio operation button 16
When the tape recorder 1 is turned on and the tape recorder 1 is put into the playback state without a tape cassette installed, the power battery in the recorder 1 is also connected to the tuner circuit, so both electric circuits are activated.

Therefore, turn the tuning knob 21 and adjust the dial 19.
If the desired radio waves are received, the recorder can be operated as a radio.

The electrical circuit of the FM radio tuner 2 coupled to the tape recorder 1 is constructed as shown in FIG.

That is, in FIG. 3, the FM radio tuner L has:
An FM tuner circuit 30 indicated by a block indicated by a chain double-dashed line;
A power switch 31, a normally open switch 32 according to the present invention, and a light emitting diode as a radio operation display member 18 are built in.

The upper yM tuner circuit 30 is well known and is comprised of a frequency converter, an intermediate frequency amplifier, an amplitude controller (none of which is shown), and an FM detector.

The above FM detector has detection coils I, L2 and a diode D□.

D2, capacitors C1, C2, C3, C4 and resistor R□
~R1, and its output is extracted by a series circuit of a resistor R3 and a capacitor q.

The connection point between the resistor R5 and the capacitor 〇 is connected to the connecting terminal 17f via the capacitor 〇, and is also connected to the connecting terminal 17b through the capacitor 〇 and the resistor R6.

The connection terminal 17f is a terminal for introducing the radio reception output of the tuner 2 into the second amplifier of the recorder 1 when the tape recorder 1 is in the playback state, and the connection terminal 17b is a terminal for introducing the radio reception output of the tuner 2 into the second amplifier of the recorder 1. When the recorder 1 is in the recording state and records the radio reception No. 4, it serves to introduce the same signal to the first amplifier of the recorder 1.

Further, a decoupling circuit including a transistor Tr1, capacitors C7 and C8, and resistors R7 and R8 is disposed in the tuner circuit 30 to prevent fluctuations in the power supply voltage.

The power switch 31 is constituted by a normally open switch having conductive groove movable contacts 31a and 31b supported by an electrically insulating support member 33.

The opening/closing member of this switch 31 is formed of an electrically insulating member 34 that moves in conjunction with the radio operation button 16 (see Figures 1 and 2). When the switch 31 is moved to the insulating member 34
It is designed to be closed by the movement of.

One movable contact piece 31a of this switch 31 is connected to the connection terminal 17e, and the other movable contact piece 31b is connected to the resistor R8 of the decoupling circuit inside the tuner circuit 30.
It is connected to the connection point of capacitor C7.

Moreover, a series circuit of a radio operation display member 18 and a resistor R9 is connected between the movable contact piece 31b and the ground.
When the switch 31 is turned on, the display member 18 lights up to indicate that the tuner 2 is in an operating state.

The normally open switch 32 according to the present invention is the power switch 3
1.

That is, this switch 32 is composed of conductive movable contact pieces 32a and 32b supported by the electrically insulating member 33, and one movable contact piece 32a is connected to the connection terminal 1.
7c, and the other movable contact piece 32b is connected to the connection terminal 1.
7d, respectively.

The opening/closing member of this switch 32 is formed of a conductive member 35 arranged in parallel with the insulating member 34 that opens and closes the switch 31, and this conductive member 35 is grounded.

Note that the terminals 17a and 17g among the connection terminals 17a to 17h are terminals used when the audio activation device is connected to the tape recorder 1, and when the radio tuner 2 is connected as in the present invention. If it is, it becomes a loose terminal.

In contrast to the electrical circuit of the tuner 2 constructed as described above, the electrical circuit of the tape recorder 1 is constructed as shown in FIG. 4.

The electric circuit shown in FIG. 4 shows only the parts necessary for connecting the electric circuit of the radio tuner 2, and the recording/reproducing magnetic head, bias circuit, etc. are omitted.

In FIG. 4, the output end 36a of the built-in microphone 36
is connected to the switching movable contact piece 37a of the external microphone connection jack 37, and the fixed contact piece 37b in contact with the indirect piece 37a is connected to the input of the AGC circuit (automatic gain control circuit) 38 through the resistor R1o and the capacitor C1o. connected to the end.

Further, the other output end 36b of the microphone 36 is grounded together with the fixed terminal 37c of the jack 37.

An operating voltage is applied to the output end 36a of the microphone 36 by a switching circuit including a transistor Tr2 and resistors R1□ and R1°.

In the recording input circuit configured in this manner, the connection terminal 14b is connected to the fixed contact piece 37b of the jack 37, and the connection terminal 14c is connected to the base of the transistor Tr2.

The output terminal of the AGC circuit 38 is connected to the input terminal of a first amplifier 39, and the output terminal of the first amplifier 39 is connected to the recording terminal through a series circuit of a capacitor C11 and a resistor R13.
It is connected to the fixed terminal S1a of the reproduction selector switch S1.

Recording/playback selector switch S1. S2. S3 are interlocked, and when the tape recorder is in the playback state (see Figure 4), the switching contact piece Sid of the switch S1 is set to the fixed terminal S, a to S1b, and the switching contact piece S2d of the switch S2 is set to the fixed terminal. S2a is connected to S2b, and a switching contact piece S3d of switch S3 connects fixed terminal S3a to S3b.

Then, when the tape recorder 1 enters the recording state, the switching contact S1d of the switch S1 connects the fixed terminal 521a to S1C.
, the switching contact piece S2d of the switch S2 connects the fixed terminal S2a to the fixed terminal S2C, and the switching contact piece S3d of the switch S3 connects the fixed terminal S2a to the fixed terminal S2C.
are connected by switching the fixed terminal S3a to S3C.

Recording/playback selector switch S1 configured in this way
The fixed terminal S1b is connected to one end of a variable resistor R14 for volume adjustment, and the other end of the resistor 'iNj' 14 is grounded.

Furthermore, the fixed terminal S1C is connected to resistors R15 and R1 connected in series between the fixed terminal S2C of the changeover switch S2 and the ground.
It is connected to the connection point of 6.

The fixed terminal S2a of the switch S2 is connected to the input terminal of the second amplifier 40, and the fixed terminal S2b is connected to the adjustable movable terminal of the variable resistor R14.

Further, the changeover switch S3 is configured to change over the output circuit.

This output circuit is composed of a monitor jack 41 connected to the output transformer T and a speaker 42 connected via this monitor jack 41, and the fixed terminal S3b of the changeover switch S3 is connected to the speaker 42. One end of the fixed terminal S3C is connected to the other end of the speaker 42 via a resistor R1□.

The fixed terminal S3a is grounded.

The manner in which the jack 41 and the speaker 42 are connected is such that the fixed contact piece 41b of the jack 41 is connected to the output transformer T, and the movable switching contact piece 41a is connected to the other end of the speaker 42.

A fixed terminal 41c of the jack 41 is connected to ground.

Further, 1. The fixed terminal S3b of the switch S3 to which one end of the beaker 42 is connected is connected to the connection terminal 14d, and the fixed terminal S1b of the switch S1 is connected to the connection terminal 1.
Connected to 4f.

Further, the terminal 14a among the connection terminals 14a to 14h is connected to the battery check circuit 43, the terminal 14g is connected to the positive terminal of the power supply battery E, and the terminal 14h is connected to the ground.

The connection terminal 14e connects the power source battery E to the tuner through the radio tuner connection terminal 17e (see FIG. 3), and serves to supply operating voltage to the tuner. Switch S that opens in conjunction with the auto-shutoff device when the end of the tape is detected
4 to the fixed contact piece 15b of the AC adapter jack 15.

The jack 15 has a switching movable contact piece 15a connected to the positive terminal of the power battery E, and a fixed terminal 15c.
is connected to the negative terminal of the power supply battery E.

The above switch S is the playback operation button 1 of the tape recorder 1.
It is closed in conjunction with the push-in operation of the tape 0b (see FIG. 1), and is opened when the end of the tape is detected during recording by the recorder and an auto-shutoff device (not shown) is activated.

Therefore, in the recording state of the tape recorder 1 connected to the tuner to record radio reception number 4, when there is no more tape to record, the auto shut-off device is activated, so this switch S is opened and the radio tuner The power to 2 is also cut off.

If the switch S4 that operates in this manner is provided, the recording time of the recording tape is <3 types: 3C@, 45 minutes, and 6@, so the radio tuner 2 is connected to the tape recorder 1 to configure a radio, If tape recorder 1 is set to recording mode and the above recording tape is attached, 3 or 4
Since the auto-shutoff device is activated to automatically stop the operation of the tape recorder 1 and radio tuner 2 after the powder or 6 powder has been released, the switch S4 can be used as a timer switch.

In addition, the fixed contact piece 1 of the AC adapter jack 15 is
5b is connected to a movable contact piece S5a of a normally open switch which is closed by pressing the playback operation button 10b (see FIG. 1) of the tape recorder.

The switch S has three movable contact pieces S5a. S5b,
The movable contact pieces S and b are connected to the motor control circuit 45 via a temporary stop switch S6, and the movable contact piece S5C is directly connected to the motor control circuit 45.
is bordered by

This switch S5 is activated by pressing the playback operation button 10b.
The movable contact pieces S5a and S, b come into contact and the motor control circuit 4
An electric battery E is connected to 5 and the circuit is operated to rotate a tape transport motor (not shown) at a constant speed.

In addition, when fast forwarding the tape or rewinding the tape, the movable contact pieces S5a, S5b,
By bringing all S5Cs into contact, it works to switch the motor rotation to high speed.

The electric circuit of the tape recorder 1 is constructed as described above.

Next, let's talk about the case where this tape recorder 1 and the above FM radio tuner business are combined to receive radio broadcasts and record them.First, when the two are combined as shown in Figure 1, each of the tuner business Connection terminals 17a-17
h represents each connection terminal 14a to 14 of the tape recorder 1;
Since each contacts h, the electric circuits of both are connected.

In this state, when the recording/playback selector switches S□ to S3 of the tape recorder 1 are switched to the recording mode, the switch S1 switches between the switching contact piece S1d and the fixed terminals S1a and S1.
The switch S2 has a switching contact piece S2d that connects the fixed terminals S2a and S2C, and the switch S3 has a switching contact piece S3.
d connects to fixed terminals S3a and S3C.

Then, attach the recording tape and press the recording operation button 10a again.

When the raw operation button 10b is pressed, the switch S and the movable contacts S5a, S, and b of the switch S close, and the tape recorder 1 enters the recording state.

On the other hand, radio operation button 1 of FM radio tuner L
When the switch 6 is turned on, the switch opening/closing member formed of the electrically insulating member 34 and the conductive member 35 is turned on, so that the power switch 31 and the normally open switch 32 are turned on. are respectively closed.

When the normally open switch 32 is closed, the conductive member 35
is grounded, and the movable contact piece 3 of the switch 32
The base of the transistor Tr2 connected to the terminal 2a through the connection terminals 17c and 14c is grounded, the transistor becomes non-conducting, the supply of operating voltage to the built-in microphone 36 is cut off, and the microphone 36 is in a non-operating state. becomes.

Therefore, this prevents howling caused by the microphone 36 working when recording the radio reception No. 4.

On the other hand, when the movable contact piece 32b of the switch 32 is grounded, the other end of the speaker 42 is grounded through the connection terminals 17a and 14d, so that the speaker 42 is activated at the same time as the tape recorder 1 is playing. .

Since the tuner circuit 3° is activated when the power switch 31 is closed, if the radio dial knob 21 (see Fig. 1) is turned and the dial 19 receives the desired radio wave, this reception signal 4 is connection terminal 1
It is introduced into the AGC circuit 38 through 7b and 14b.

Therefore, this radio signal is transmitted to the first amplifier 39 - capacitor c, 1A - resistor R13 - fixed terminal S, a - switching contact S, d - fixed terminal 51c - resistor R16 - fixed terminal 52C.
It reaches the second amplifier 40 through the path of the switching contact piece 52d and the fixed terminal 52ai, and is output from the speaker 42 via the output transformer T1 motor jack 41.

Further, the output of the second amplifier 40 is recorded on a recording tape by a recording magnetic head (not shown).

Therefore, the speaker can be operated for monitoring purposes when recording radio broadcasts.

However, when a monitor earphone is connected to the monitor jack 41, the speaker 42 becomes inactive.

Further, in this coupled state, when the recording/playback selector switches S1 to S3 of the tape recorder 1 are switched to the playback mode and the tape recorder 1 is placed in the playback mode, an FM radio is configured.

That is, each switching contact piece S1d of the switching switches S1 to S3,
S2d and S3d are in the switching state shown in FIG. 4, and the fixed terminals S1a, S, and c.

The connections between S2a and 52C1 and S3a and S3c are broken, and the fixed terminals S1a and 51bXS2a and 52b1 and S3a and S3b are connected.

When the switches S and -S3 are switched in this way, the output of the tuner circuit 30 is now transferred to the connection terminals 17f and 14.
Since this output signal is applied to the volume control variable resistor 14 through the fixed terminal S1b through the fixed terminal S1b, this output signal can be adjusted to an appropriate thickness with the resistor R, and then connected to the fixed terminal 52b of the switch S2. The voltage is applied to the second amplifier 40 through the path from the piece 52d to the fixed terminal S2d.

Therefore, the radio reception output amplified by this amplifier 40 is
The signal is output from the speaker 42 via the output transformer T1 monitor jack 41.

Therefore, when the tape recorder 1 functions as a radio, the second amplifier 40 and the speaker 42 are used as an amplifier circuit and an output device of the radio.

Furthermore, if the installed cassette tape has been recorded during this radio playback, the recorded tape is also played back at the same time, so that mixed playback can be performed.

In addition, when the tuner l and the tape recorder 1 are connected, if the radio operation button 16 is turned off, the switch opening/closing member consisting of the electrically insulating member 34 and the conductive member 35 will also open and close. Since the switch is moved to the off side, the power switch 31 and the normally open switch 32 are opened, and the CM tuner 2 is inactive, as shown in FIG.

Therefore, in this state, the tape recorder 1 can perform the recording and reproducing functions of the recorder itself without any hindrance.

As described above, according to the present invention, when a radio tuner is detachably connected to an ultra-compact cassette recorder to make it a cassette tape recorder with a radio, the button for operating the radio provided on the radio tuner is By skillfully utilizing a switch opening/closing member that is linked to the switch, the radio tuner can be attached and detached, allowing the speaker to function as a monitor when recording radio broadcasts by simply opening and opening a single normally open switch. We can provide a small tape recorder that

[Brief explanation of the drawing]

Figure 1 is a front view of a radio tuner combined with an ultra-small cassette tape recorder, and Figure 2 is a perspective view of the tape recorder and radio tuner shown in Figure 1 separated. 3 is a diagram showing an example of an electrical circuit of a radio tuner to which the present invention is applied, and FIG. 4 is an electrical circuit diagram of a tape recorder to which the tuner is coupled, having the electrical circuit of FIG. 3. 1... Tape recorder 2... Radio tuner, E... Power supply, 16...
Radio operation operation button, 31...Power switch,
32... Normally open switch, 34... Electrically insulating member, 35... Conductive member, 42...
····speaker

Claims (1)

[Scope of Claim for Utility Model Registration] A small tape recorder in which a radio tuner is detachably connected to a small tape recorder, and a radio tuner circuit is connected to an electric circuit inside the waist tape recorder to constitute a radio. A normally open switch that is installed inside the tuner and connects the power supply inside the tape recorder to the radio tuner circuit, and also serves as a monitor by grounding the speaker terminal inside the tape recorder when the tape recorder is recording. is installed next to it and is linked to the radio operation button. The opening/closing members of both of the above switches are made of an electrically insulating member that opens and closes the power switch, and a grounded conductive member that opens and closes the normally open switch. A compact tape recorder to which a radio tuner is detachably connected, characterized in that when in a recording state, the conductive member closes the normally open switch and causes the speaker to function as a monitor.