DE2157851A1 - Tape recorder - Google Patents

Description

215705t

PATENT ADVERTISER DR. GERHARD SCHAEFER DIPLOMA PHYOIC

ύ . ^ went

<J> J - tf 6 mi'A Munich I ¹ IiIId ₁ h

Seitneisüaße U Telephone 7! KiOi) UI

OLYMPUS OPTICAL CO., LTD. No.4,5-2, Hatagaya 2-chome Shibuya-ku, Tokyo / JAPAN

Tape recorder '

The invention relates to a tape recorder which can be connected to this electrically operated additional devices, the tape recorder having a headphone socket and a Pern switch socket, Such additional devices are, for example, a loudspeaker, a microphone and a frequency-modulated tuner. These accessories need electrical energy for their operation. They are supposed to be removable be connected to a tape recorder which is provided with an electrical power source, so that they are their electrical Energy received from the electrical device when using this are connected.

Sch / Kp

209825/098

9 ί

L / - 'iuit i'Iiniaturconbanagei'Ube to be built extremely small can, speakers and output trouücr eis of the associated Amplifier aur; removed from the housing of the tape recorder and A headphone was provided that can be connected to the tape recorder via a headphone socket. If with such a miniature tape recorder If the use of a loudspeaker is desired, an output circuit and a loudspeaker are connected via the headphone socket connected to the tape recorder, so that the output signal of the tape recorder is sent to the loudspeaker via the output circuit, which amplifies the output signal, is supplied.

in this case it becomes an electrical power source for the output circuit needed. This makes it necessary to make the housing of the output circuit large enough to accommodate the battery can accommodate. Furthermore, it is necessary to switch off the power source from the output circuit every time it is in operation is finished. The operation of the tape recorder becomes cumbersome. Alternatively, the electrical energy for the output circuit be supplied by the tape recorder. For this, however, it is necessary to provide separate terminals for the supply of electrical energy to the output circuit in the tape recorder, whereby the construction and operation of the tape recorder is complicated and cumbersome.

BATH

209825/0989

51

Measurement input impedance of the microphone circuit of a tape recorder with an amplifier containing a transistor is at most a few kilo-ohms. Hence dynamic or magnetic microphones is used with an impedance whose value in tape recorders of the type described above is approximately the input impedance of the microphone circuit of the tape recorder.

Recently, condenser microphones or ceramic microphones have been developed which are very small and inexpensive. A condenser microphone has a characteristic by which the lower frequency range is cut off when the impedance is made small, .is is desirable, therefore, an element, such as a field effect transistor (hereinafter called FET) having a high input impedance and a low output impedance between the condenser microphone and to switch the amplifier of the tape recorder to have a low output impedance of about a few kilo-ohms for the amplifier of the tape recorder, while the condenser microphone has a high power and the lower frequencies are not cut off, as would be the case with a low impedance.

When a condenser microphone is in the microphone circuit of a tape recorder the above-described type is connected, then no serious problems arise when this condenser microphone in the

209825/0989

Main body of the tape recorder is housed. However, if the condenser microphone is used as a portable microphone is used and is connected to the microphone socket, the tape recorder must be built so that the condenser microphone can be connected to it without degrading its performance. This makes it impossible to use a condenser microphone as a moving one Using the microphone with a conventional tape recorder «

It is therefore desirable to use condenser microphones by providing a PET with common conventional tape recorders, whereby the output impedance of the condenser microphone is reduced by the FET to one to a few kilo ohms that of the input of the amplifier of the tape recorder are adapted, which has an input impedance of several kiloohms. Furthermore, it is desirable to place the FET close to the microphone to vibrate the same to prevent.

For this purpose, it is advantageous to arrange the condenser microphone and the FET in a single housing so that the low The output impedance of the FET is at the amplifier of the tape recorder, while the condenser microphone is operated at high efficiency and vibration is prevented.

ORIGINAL

209825/0989

In this case, an electric power source for the FET is required. A small silver or mercury cell can be used for this be built into the microphone housing. However, it requires its own electrical power source, albeit a very one may have low capacity. Furthermore, it is desirable that the turn off the electric power source every time after the operation of the microphone, which makes the operation of the tape recorder difficult power. Alternatively, the electrical energy for the FET can be drawn from the electrical power source of the tape recorder. In this case, however, it is necessary to provide separate terminals on the tape recorder in order to connect the FET to the tape recorder associate. This results in a complicated construction of the tape recorder.

In the case of the electric power for the FET, which is housed in the case of the condenser microphone, from the main body of the tape recorder comes, electrical noise can be the electrical

circle

Power source of the tape recorder cause the microphone to vibrate. It is therefore necessary to provide a decoupling circuit comprising a capacitor and a resistor, the are connected to the electrical power source, so that the

Vibration is prevented. However, it is disadvantageous to have one To arrange the decoupling circuit in the housing of the tape recorder, since the resistance of this decoupling circuit is permanently in the load circuit of the tape recorder. ■

209825/0989

~ ⁶ ~ 215705]

If, on the other hand, the capacitor and the resistor, which form the decoupling circuit, are arranged in the housing of the microphone a special space is required, which makes it necessary to enlarge the case. This is a major disadvantage for a miniature microphone.

Furthermore, in order to make a secret recording, it is necessary to operate the tape recorder away from the microphone, for example in a pocket of the operator's clothing. This requires the switch of the tape recorder to be operated remotely

When the tape recorder with microphone is in recording mode, the recording usually does not only contain the sound that is being recorded should, but also unwanted noises from the environment, which degrades the quality of the recording.

Therefore, if a recording is made, for example in a lecture where the lecturer's electrical signal generated by the microphone is transmitted through a frequency-modulated transmitter (hereinafter referred to as FM transmitter for short) is transmitted via an antenna, the recording is made by connecting a frequency-modulated tuner (hereinafter referred to as FM tuner) to the microphone socket of the tape recorder, the electrical signal transmitted by the FM transmitter

209825/0989

" ⁷ " 215785T

received, so that the lecture without undesired noise generated in the area at the lecture, is recorded. In this case, however, an electric power source is required for the FM tuner. If the battery is arranged in the housing of the PM tuner, no serious problems arise, except that a special space in the housing is required for this battery. The operation of the tape recorder is made more difficult because the electrical power source must be switched off each time after the tape recorder has finished operating.

Alternatively, the electrical energy for the FM tuner can be drawn from the tape recorder.

In this case, however, separate clamps are required on the tape recorder. This complicates the construction of the tape recorder and the FM tuner cannot work with a conventional tape recorder which does not have such terminals.

When performing a secret recording, the size of the various additional devices that must be connected to the main body of the tape recorder, which is in a pocket, for example in the clothes of the operator, is kept as small as possible. '

209825/0989

The invention is based on the object of avoiding the above-described disadvantages of known electrical devices and a To create a tape recorder to which electrically operated additional devices, such as loudspeaker equipment, microphone equipment, frequency-modulated tuners and the like can be connected in a simple manner without further connecting means. this will achieved in that both sockets are connected to the power source of the tape recorder that they are used as a power source for the Serve additional equipment.

According to one feature of the invention, a loudspeaker is provided, the one with an output circuit for amplifying the electrical Signal coming from the tape recorder connected to it, the tape recorder being a source of electrical power, a headphone jack and a remote switch jack and wherein the loudspeaker device is provided with two plugs which can be plugged into the remote switch socket and the headphone socket of the tape recorder. This is the electrical, energy, which is provided for the operation of the loudspeaker device, by simply plugging in two plugs of the loudspeaker device into the jacks of the tape recorder taken from this.

According to a further feature of the invention is the microphone device for connection to a tape recorder with an electrical

209825/0989

Power source and an amplifier with a transistor, a remote switch socket and a microphone socket are designed in such a way that that they consist of a condenser microphone, an element for adaptation the output impedance of the microphone to the input impedance of the amplifier of the tape recorder, for example FET, and two plugs are provided which can be connected to the remote switch socket and the microphone socket of the tape recorder. As a result, the electrical energy that is required for the operation of the FET of the microphone device is only obtained by inserting two plugs of the microphone device into the sockets of the tape recorder, taken from the tape recorder.

According to a further feature of the invention is the microphone device provided with a decoupling circuit and a remote switch, so that the vibration of the microphone device as a result possible electrical noise from the electrical power source of the tape recorder is prevented while the remote control of the Tape recorder is possible through the remote switch of the microphone device, which facilitates the operation of the tape recorder.

According to a further feature of the invention is an FM tuner with a tape recorder that has an electrical power source, an amplifier, a remote switch socket and a microphone socket has, connectable in such a way that the FM tuner with

209825 / Q9Ö9

-ίο- 2157051

two plugs are provided, one in the remote switch socket and one in the Microphone jack of the tape recorder can be plugged in, whereby the electrical energy required for operating the FM tuner is supplied by the tape recorder. This enables information transmitted from a PM transmitter to be recorded without being superimposed by any undesired noises from the vicinity of the tape recorder, to be recorded by the tape recorder.

According to a further feature of the invention is a microphone device with a condenser microphone and an associated PET for adapting the output impedance of the microphone device arranged with the singing impedance of the tape recorder in the same housing. Here, the electrical source for the FET is im Plugs arranged, which reduces the size of the microphone.

Further details and advantages of the invention can be found in the The following description of the exemplary embodiments shown in the drawings can be taken.

Show it:

Fig. 1 is a block diagram showing the arrangement of the microphone a remote switch and headphones that can be connected to a conventional tape recorder;

209825/0989

-η-

2157351

Fig. 2 is the Pig. 1 corresponding block diagram, in which, however, according to the invention, the electrical energy for the Loudspeaker from the tape recorder via the remote switch socket is removed;

J shows the block diagram of a modification of the circuit of Fig. 2;

I ^? Fig. 4 is a block diagram of the electrical circuit of the microphone in the tape recorder according to the invention, in which the electrical energy is supplied to the microphone from the tape recorder through the remote switch socket, as is the case with the loudspeaker shown in Fig. 2 or 5;

5 shows a block diagram of a modified circuit of the microphone with a remote switch of the tape recorder according to the invention;

Fig. 6 is a schematic general view showing the appearance of the microphone used in Fig. 5;

7 is a block diagram of another embodiment of the Switching the microphone with a remote switch;

209825/0 98

Figure 8 is a schematic general view of the appearance of the microphones used in Fig. 7;

Fig. 9 is a block diagram of the circuitry of the FM tuner for the Use with a tape recorder according to the invention,

10 shows a circuit diagram of another embodiment of a W erfindungsgernäßen microphone;

Figure 11 is a schematic general view of the appearance of the Microphone plug according to the invention;

Fig. 12 is a section along the line A-A in Fig. 11; Fig. 13 is a section along the line B-B in Fig. 12;

Figure 14 is a general view of the appearance of another embodiment a microphone plug according to the invention;

Fig. 15 is a section along the line C-C in Fig. 14;

Flg. l6 is a circuit diagram of the electrical circuit of another Embodiment of a microphone according to the invention;

P 359

209825/0989

~ ¹³ ~ 215785 t

Pig. 17 is a perspective view of a tie pin in which the microphone according to FIG. 6 is installed;

18 shows a longitudinal section through the tie pin according to FIG. 17;

19 is a perspective view of a modified form. of the microphone shown in Fig. 17, which is in a Tie pin is housed;

Fig. 20 is a circuit diagram of another embodiment a microphone according to the invention;

21 is a perspective view of a tie pin, in which the microphone shown in Fig. 20 is housed;

22 shows a longitudinal section through the interior of the tie pin according to FIG. 21j

Fig. 25 is a circuit diagram showing another modification of the electrical Circuit of the microphone according to the invention;

24 is a perspective view of the appearance of the microphone plug; that is used in the microphone shown in Fig. 25;

0 9 8 2 5/0989

2157857

! • 'ig. 25 is an enlarged section through the interior of the FIG Pig. 24 microphone plug shown

Pig. 2β a circuit diagram showing the circuit of the tape recorder represents according to the invention;

27 shows a perspective view of a modified embodiment Guide form of a microphone plug, as it is in the

Circuit of the Pig. 2β is used j

Fig <28 a section αμΓΟίι the interior of the microphone plug after Pig. 27

Pig. 1 shows a conventional tape recorder with an electrical one Power source 1, an amplifier unit 2, a motor 3 and a Main switch 4, the one with the plus terminal of the electrical power source 1 is connected. As shown, there is a remote switch socket 5 between the main switch 4, the amplifier unit 2 and the motor j5 and a microphone jack 6 is between the input terminal the amplifier unit 2 and earth connected. the Microphone unit 7 is provided with a remote switch 10 which is connected to the remote switch connector 8. This one is so ex-

P 359

209825/0989

formed that it can be plugged into the remote switch socket 5. The remote switch 10 is connected between the shielding terminal and the middle terminal of the remote switch plug 8. The microphone unit 7 includes a microphone 12 and a matching transformer 11, the primary winding of which is connected to the microphone 12 as shown. The terminals of the secondary winding of the matching transformer 12 are connected to the shielding terminal and the middle terminal of the microphone plug 9, the. with the Microphone jack 6 can be engaged. The headphone 15 is with the shielding clamp and the middle clamp of the headphone plug 14 connected to the microphone socket 13 of the tape recorder is pluggable.

Since in such a conventional tape recorder the plug of the microphone unit 7 is connected to the microphone socket 6 of the tape recorder and the remote switch plug 8 is connected to the remote switch socket 5, the input circuit of the microphone is connected to the electrical circuit of the remote switch plug, so that when the main switch 4 is closed , the tape recorder can be switched ON or OFF by operating the remote switch 10. The headphone 15 can be operated by connecting the plug 14 to the headphone jack 1J>. When the speaker

209825/0989

-i6- 2157351

should not be operated, an output circuit and the loudspeaker connected to the headphone jack 13 to output the Feed loudspeakers after amplification by the output circuit. In this case a separate electrical power source is necessary, to supply the output circuit with energy.

Fig. 2 shows the electrical circuit according to the invention, at the the output circuit and the speaker without a separate electric power source can be operated by using the remote switch socket 5 and the headphone socket 13 of the tape recorder.

In FIG. 2 the loudspeaker comprises an output circuit 21 for amplifying the output signal of the amplifier unit 2 of the tape recorder and a loudspeaker 22 which is designed so that it is supplied by the output circuit 21 with power ) will. The plus line of the output circuit 21 is with the shielding terminal of the plug 23 connected to the remote switch socket 5 is engaged and the shield clamp of the Connector 23 is connected to the middle terminal of connector 23, while the earth line of the output circuit 21 is connected to the shielding terminal of the plug 24, which is connected to the headphone socket 13 is engaged. The middle clamp of the connector 24

P 359

209825/0989

Is connected to the input terminal of the output circuit 21.

If, in the arrangement shown in FIG. 2, the plug 23 is connected to the remote switch socket 5 and the plug 24 with the headphone jack 13, the plus side becomes the electrical Power source for the output circuit 21 from the tape recorder via the Plug 23 and the socket 5 applied to this, while the -irdseite the electrical power source via the connector 24 and the socket 13 is applied to the output circuit 21.

Between the middle clamp and the shield clamp of the connector can - as shown in Fig. 3 - instead of a direct short circuit of the middle terminal and the shield terminal of the plug 23 a switch 25 may be provided. In this case, the Switch 25 as a remote switch for the loudspeaker circuit.

Fig. 4 shows a microphone circuit in which a condenser microphone by using the remote switch socket 5 and the microphone socket 6 is used with an FET as shown in FIG is.

209825/008 »

Each / - ¹⁸ - 2 7 57851

In Pig. 4, the condenser microphone unit 31 has a condenser microphone 32 and an FET 33. The grid of the FET 33 is connected to the condenser microphone 32, while the output (drain) of the PET 33 is connected to the shielding contact of the plug 34, similar to the plug 8 in Pig. 1 and the source of the FET 33 is connected via a resistor to the disconnecting contact of the plug 35, which is similar to the plug 9 in FIG. "The remote switch J> 6 is connected between the shielding contact and the center contact of the plug 34.

If in the arrangement shown in FIG the remote switch socket 5 is connected and the plug 35 with the Microphone socket 6 of the conventional tape recorder is the plus side of the electrical energy for the FET 33 from the tape recorder applied to the FET 33 via socket 5 and plug 34, while the south side of the electrical energy via the socket 6 and the connector 35 is applied to the FET 33. The remote switch 3β can be omitted and the shielding contact and the center contact of the plug 34 can be short-circuited to make the arrangement compact close.

Fig. 5 shows a microphone circuit with a decoupling circuit, in which the remote switch according to the invention is switched on to

P 359

209825/0 989

2157351

to prevent the vibration of the microphone circuit. The headphone circuit is removed here; However, it can also be present.

Fig. 6 shows the Pig microphone view. 5 ·

The tape recorder shown in Fig. 5 is similar to that in 4 except that the headphone circuit is removed. The condenser microphone circuit is similar to that shown in Fig. 4, only that the remote switch 3β is removed. Between the microphone unit 31 and the plugs 34 and 35 is a remote switch housing 4l provided, which includes a remote switch 32, which between the shielding contact and the center contact of the plug 34 are switched is. In the remote switch housing 41 there is also a capacitor C and a resistor R is provided. The capacitor C is between the drain of FET 33 and condenser microphone 32 - as shown - switched, while the resistor R is connected between the output of the FET 33 and the remote switch 42, so that the capacitor C and the resistor R form a decoupling circuit.

In the arrangement according to FIG. 5, the microphone unit can be built compactly because the decoupling circuit is in the remote switch housing is housed instead of in the microphone unit.

209825/09

Pig. 7 shows a modification of the microphone unit of FIG. FIG. 8 shows the appearance of the microphone unit according to FIG.

As can be seen from the drawings, separate lines extend from the plugs 34 and 35. Here are those from the plug outgoing lines connected to the microphone unit j51, while the remote switch housing 4l with the lines of the Connector 34 is connected so that the remote switch housing is disconnected from the microphone unit 31 is arranged.

Fig. 9 shows the electrical circuit of the invention in which a PM tuner is coupled to the tape recorder without a own electrical power source is required for the FM tuner. The FM tuner uses the remote switch socket and the Microphone socket of the tape recorder.

In FIG. 9, the tape recorder itself is similar to that in FIG. 5 shown. The FM transmitter unit for use with the FM tuner, as shown in Fig. 9, comprises a microphone 51, for example for a lecturer in a lecture, a transmitter 52 which is connected to the microphone 51 and a electrical power source 53 connected to transmitter 52, to supply it with energy.

An antenna 54 is connected to the transmitter 52, so that the The audio signal picked up by the microphone 51 is amplified,

P 359. .-.

209825/098 9

-21.- 2157651

frequency modulated and then transmitted by the antenna 54. The FM tuner unit comprises an FM tuner 55 and an antenna 56, which is associated with this. The FM tuner 55 has plugs 57 and 58, which are designed so that they can be connected to the remote switch socket 5 and the microphone socket β of the tape recorder. the The plus side of the output of the FH tuner 55 is with the center contact of the plug 57 and the center contact 57 is connected to the shielding contact of the plug 57. The earth side is with your shielding contact of the plug 58 is connected and its center contact to the output contact of the FM tuner 55 · The FM tuner unit therefore receives the frequency-modulated audio signal via the Antenna 56 and demodulates it by the FM tuner 55

When in operation the plug 57 with the remote switch socket 5 and the plug 58 with the microphone socket 6 of the tape recorder connected, is the plus side of the electrical energy for the FM tuner 55 applied from the electrical power source 1 of the tape recorder via the socket 5 and the plug 57; the earth side is applied via socket 6 and plug 58. The motor> and the amplifier unit of the tape recorder are from the electrical Power source 1 via socket 5 and plug 57 powered.

209825/098

If - as in the case of the recording of a lecture - the antenna of the FM tuner 55 receives the input signal from the antenna 54 of the transmitter unit it is sufficient to simply plug the plugs 57 and 58 of the FM tuner 55 into the corresponding sockets 5 and β of the tape recorder to make a recording on the tape recorder.

However, if it cannot be determined when the incoming " signal is applied to the antenna 56 of the FM tuner 55, it is necessary to leave the tuner 55 connected to the tape recorder and thus in the operating position, both electrical energy and tape in the tape recorder being consumed. In such a case, it is preferred to provide a circuit or a sound start circuit in the tape recorder designed in this way is that the operation of the electrical circuit for the motor begins when an audible signal is input. In this case it will the motor j5 is not driven, although the main switch 4 is closed is until an audible signal is given to the circuit. As a result, the energy consumed is reduced to that of the FM tuner 55 and the Amplifier unit 2 reduced while the tape recorder is not in operation. When an audible input signal on the FM tuner is given, the motor 2 starts through the in the tape recorder to rotate the existing circuit, so that the * consumption of tape is kept to a minimum.

P 359

209825/0989

2157051

Pig. 10 shows an alternative embodiment of the electrical circuit of the microphone device according to the invention for use with a conventional tape recorder in which a condenser microphone and an FST are housed in the same housing and the FET through an electrical power source, which is housed in the microphone plug of the microphone device, is powered. This makes it possible to keep the size of the microphone apparatus minimal, so that it suitable i _s ^ fy _re i _ne secret recording, wherein the high impedance of the output of the FET is applied to the microphone and the output is matched with low impedance to the tape recorder.

Similarly in FIG. 10 1st the circuit of the microphone apparatus substantially shown in Fig. 4 except that the remote control switches of Fig. Omitted 25 and the output of the FET 33 is connected to the shield of the microphone plug 66 via the line 87. Furthermore, an electrical power source 67, for example a mercury cell, a silver cell or the like with a relatively small capacity is provided and a terminal of the microphone 32 opposite to that which is connected to the grid of the FET 33 is via the line 86 to the shielding contact of the Connector 66 connected. The source of the FET 33 is connected to the center contact of the plug 66 via the line 88, the lines 86, 87, 88 together forming an electrical braid 64.

P 359 .-.

209825/0989

The electrical power source 67 is housed in the body 68 of the plug 66, which is provided from a non-conductive plastic material.

The exact construction of the body 68 of the microphone plug 66 is shown in FIGS. 11 to 13 shown. ._ As shown in these drawings, the go Steckor 66 and the strand 64 from the body 68 out, on one side of a cover 6. "5 for the electric power source υ is removably attached. The plug 66 consists of an inner pin 75 and outer one Tube 76 surrounding inner pin 75 and isolation rings 77 and 78 disposed between inner pin 75 and outer tube 76 at the respective ends to electrically isolate pin 75 from tube 76. A leaf spring 80, which serves as the negative pole of the electric cell, which is accommodated in a recess of the body 68, is attached to the inner surface of the cover 6> and is in contact with the negative pole of the cell 79. In a recess of the body 68 is a housing 81 made of electrically conductive material W. The positive pole of the cell 79 is in contact with an electrically conductive pin 82, which serves as a positive pole, which is attached to the housing 81 »Das Ge Housing 81 is electrically connected to the outer tube 76, while the inner pin 75 is connected to the contact plate 85, which, like the cell 79 *, is connected by a spiral-shaped insulation

559

"'20982 5/098

strip 84 is electrically isolated from the housing 81. The pin 82 is electrical with the line 87 and the housing 8l is with the Line 86 connected, while the contact plate 85 with the line 88 is connected. The lines 86, 87, 88 run through the Strand 64.

The microphone device shown in FIGS. 11 to 13 can be made very small. This allows it to be conveniently used for secret recordings with a miniature tape recorder.

FIGS. 14 and 15 show another embodiment of the microphone plug according to the present invention, in which a cylindrical electrical standard cell is accommodated. As shown, the body 92 of the plug is made of molten electrically non-conductive plastic material. The electrically conductive cylindrical housing 99 is arranged in the body 92 and the flange 76a, which is formed in the outer tube 76 ^{1 of} the plug, is screwed into the housing 99, which, similar to the line 86 in FIG connected is. Its electrically non-conductive plate 102 is attached to the open end of the housing 99 near the connector, and electrically conductive layers 102a, 102b are provided on the respective sides of the plate 102; whereby

BATH ORIGINAL 209825 / ü989

? 157351

the layer 102a is in contact with the housing 99 while the layer 102b is electrically insulated from it. The layer 102 has a contact 103 * connected to it is in contact with the negative pole of the cell. The inner pin 75 of the plug is in contact with layer 102b and layer 102b is connected to line 10o, similar to line 88 in FIG. 1.0. An isolation plate 100 is connected to the other end of the housing 99 and one electrical Conductive leaf spring 101 is connected to plate 100, which is connected to line 105, similar to line 87 in FIG. The leaf spring 101 is in contact with the positive pole of the cell 98.

The cell 79 in FIG. 12 and the cell 98 in FIG. 15 can be exchanged together with the inner pin 75 by removing the cover 63 in FIG. 12 or the removable outer tube 76 'in FIG.

In the embodiments shown in FIGS. 10 to 15 is made by having the microphones 32 and the FET 33 in the same Housings are placed close together to prevent vibration, and the size of the microphone itself can be kept to a minimum because the electrical power source is housed in the body of the microphone plug.

BATH ORIGINAL

209825 / Ü989

Figures 16 to 18 show a further embodiment of a Microphone device according to the invention, which is extremely compact, so that it is convenient for secret recording can be used.

The electrical circuit shown in FIG. 16 is essentially similar to that shown in FIG. 10, except that the electrical cell 67 'is arranged separately from the body of the plug 68 ^f .

In FIGS. 17 and 18, the microphone housing 115 is in the

33 '

the microphone 32 and the FET are located, provided with a decorative pattern 119 and a sound transmission opening 120. The housing 115 is fixedly attached to the front of the body 121 of a tie pin which has a decoration 122 on its front, with the pattern II9 and the opening 120 facing outwards. .

On the rear side of the tie pin, an L-shaped extension 125 is provided, at the free end of which an annularly curved part 12Ja is arranged, in which a rotatable shaft journal 124 is located. The clamping part 125 of the tie pin is rotatably mounted on the shaft 124. A spring is arranged around this in order to press the clamping part 125 against the body 121 of the tie pin.

209826 / 09.09

BUILDING

The cell 67 ^f is accommodated in a housing 127 (schematically designated as j51a in Pig. 10) and the housing 127 is firmly attached to the rear side of the Klenimteiles 125. A leaf spring 129 in contact with the negative pole of the cell 67 'is mounted on the inner surface of the cover 128. A contact 130, which is in contact with the positive pole of the cell 6'f ', is provided in the housing 127. W in isolation ring 131 lies between the contact 130, the clamping part 125 and the housing 127. Lines 133 and Ij4 of the braid 64 * and a line (not shown) are connected to the microphone 32, the FET 33 and the cell 67 ' Make the electrical connection shown in Fig. 1-6.

19 shows a modification of FIG. 17 in which the microphone housing 115 and housing 127 housed in a tie pin are whose body 135 and clamping part 136 are one unit fc bil ien. In this arrangement the electrical connection is between the 6V wire and the microphone, the F2T and the electrical Cell produced by lines (not shown) as shown in FIG.

The tie pin itself can be made of metal and as an electric one Conductor used for the minus side of the electric current which makes their construction particularly easy.

P 359

BAD GRiGiNAL

20982 5/0989

In the embodiments shown in FIGS. 1 to 19 The size of the microphone has been made minimal in order to keep secret records by simply attaching the tie pin to the tie of the operator while a Vibration as described above is prevented.

Figures 20 to 22 show a further embodiment of the Microphone device according to the invention.

The electrical circuit shown in Fig. 20 is essential similar to that shown in Fig. ID except that the microphone 32 is accommodated in a separate housing 31 ″. Hence is the electrical power source 27 in the housing 68 of the connector housed.

As shown in Fig. 22, the housing 31 "of the condenser microphone 32 is on the outer surface of the body 14l of the tie pin by holding a part of the housing 31 "in the opening 142 of the body 14l, to increase the height of the housing 31" to reduce. The outer surface of the body l4l, as well as the of the housing 31 "covers a decorative plate 143, the Sound transmission opening 144 of the plate 143 to the microphone 32 in the housing 32 ". The tip of the U-shaped projection 145 of the body 14l is curved into a circular shape Part 146 formed in which the rotatable shaft 124 is fixed.

20982 Fj / U989

-30-? 1 5 7 9 5

The clamping part 148 is pivotally mounted on the shaft 124, around which a spring 126 is arranged, through which the clamping part is pressed against the body l4l.

The clamping part 1'48 has a U-shape in cross section in order to leave a space free in which) the base plate 149 on which the FET and other elements are arranged, attached. A cover 150 is provided to cover the elements on the base plate to cover. The housing Jl * in Fig. 20 is therefore supported by the clamping part 148 and the cover 150 are formed.

The microphone 32, the FET 33 and other elements are electrically connected to each other as shown in Fig. 20 by high quality shield wires 151 to prevent electrical vibration of the microphone device. Preferably, the clamp member 148 and the cover 150 made of metal is manufactured W represents, which has a high shielding effect.

The strand 64 is elastically held on the clamping part 148 by an elastic holder 152 made of rubber or plastic material.

The FET 33 and other elements may be housed in separate enclosure housings that are attached to the rear of the clamp member 148.

P 359

209 825/0989

Since the microphone device can be used without it is covered by a part of the operator's clothes, a high recording quality ensured.

Figures 23 to 25 show a further embodiment of the microphone device according to the invention, the one in Pig. 23 is essentially similar to that in Pig. IO shown, except that the electrical cell 67 ″ is accommodated in the same housing as the microphone j52 and the FET 33. Furthermore, a microswitch 157 is arranged via line 175 between the shielding contact of the plug 66 and the negative terminal of the electrical cell 67 ″. Lines 170, 171 and 172 extending through stranded wire 169 correspond to lines 86 and 87 of FIG. 10.

Figures 24 and 25 show the construction of the body 68 " of the plug 66 in which the switch 157 is arranged.

In these figures, the switch 157 has an elastically movable actuating member 160, at the tip of which an annular part is formed, through which the plug 66 extends loosely.

In Fig. 25, the chassis 164 of the tape recorder is with a socket P 359

209825/0989

O 1 r 7 O Γ 1

-32- I ! ) / · J O ί

which is attached to the chassis 164 by means of a groove I63 is. The inner, pin 75 and outer tube 76 act as the center contact and serve as a shield contact are electrically isolated by insulation rings 77 and 78, as in the preceding Examples. The microswitch 157 is embedded in the body 68 "of the plug, so that its actuating part 160 - as shown - extends downwards. The connector 66 itself is let in with its one end near the switch 157.

The lead 170 of the cable I69 is connected to the outer tube 76 of the plug 66, the line 171 is connected to the inner pin 75. The line 172 is connected to one terminal 173 of the Switch 157 and its other terminal 17 ^ · is to the outer Tube 76 connected to line 175, so that the connection is the electrical circuit of the pig. 23 results.

In operation, when the plug 66 is inserted into the socket 162, the actuating part 160 of the switch 157 is in single engagement with the protruding surface of the socket 162 and closes the switch 157. When the plug 66 is pulled up from the socket 162, the actuating part 160 reverses elastically back to its original position, so that the switch 157 is automatically opened,

BATH ORIGINAL

209825/098 9

which saves electrical energy.

Figures 26 to 28 show further embodiments of eggs Microphone device according to the invention.

The electrical circuit of FIG. 26 is similar to that in FIG 4, but the switch 36 of FIG. 4 is omitted and instead the output of the FET 33 with the center contact of the plug 179, the one with the remote switch socket connected by an electrical cell 67 ". The shield contact of the plug 179 is with the shielding contact of the plug connected, which is plugged into the microphone socket 6 of the tape recorder. The headphone jack 13 of FIG. 4 has been omitted from FIG. The lines 192, 193 and 194 run together and form the Strand 169. The electrical cell 67 ″ has a relatively small capacity and consists, for example, of a silver cell or a Mercury cell, since it only serves to supply the FET with energy, which effects the impedance conversion for the microphone 32.

FIG. 28 shows the structure of the body 185 of the one in FIG. 27 shown connector which includes the remote switch connector 179 and which is coupled to the tape recorder.

209 825/0989

In Pig. 28, the microphone plug 26 is similar to that shown in FIG. A socket 162 into which the plug 66 is inserted is fastened to the chassis 164 of the tape recorder by means of a groove, while a television holder socket 5 is arranged in the chassis 164 of the tape recorder.

The remote switch plug 179 includes an inner pin I83 with an insulating portion 184 at the outer end, while an insulating ^{tube 184 1 surrounds} the other end of the pin I83. An electrically conductive outer tube 186 is provided around the isolation tube 184 ″.

The socket 5 has an insulating base plate 187, which is on the Chassis 184 is attached. Its electrically conductive tube 188 for engagement with the inner pin 18j5 of the plug 179 is open attached to the base plate 187. An elastically movable contact piece 189 is arranged on the base plate I87. The encompassing Parts 19O, Ϊ.91 of the switching part I89 are designed so that they plug into the outer tube 186 while the other aide of the piece I89 is resiliently pressed against the base plate 187 so that the tube 188 with the other end of the part 189 in contact stands.

P 359

209825/0989

Line I92 is connected to outer tube 76, connection line 193 is connected to inner pin 75, and line 193 is connected to inner pin 183. Outer tube J6 of plug 66 is connected to outer tube 186 of plug 179 by line 204. Therefore, when the plug body 185 is coupled to the tape recorder, an electrical connection is made between the inner pin 183 of the tube 188, the switching part 189, the encompassing parts 190, 191 and the outer tube 186 so that the electrical cell 67 "is operational That is, the electrical .Energie is given from the cell 67 "by using the remote switch socket 5 to the FET 33 only by the fact that the plug body 185 is coupled to the tape recorder.

In the case of using a microphone other than a low impedance condenser microphone, it becomes an electrical power source not required for the FST. This makes it possible to use a conventional remote control system. In this case it will the length of the inner pin 183 or isolation tube 184 enlarged so that it presses against the switching member 189 and disengages it from the tube I88, around the circle of the electrical cell 67 ″ to open.

20 9 82 5/0989

-JiG-

The construction of the socket 5 is not different from that described above Embodiment is limited and can be changed in many ways will.

Preferably, a portion of the plugs 66 and 179 and the leads are molded into the body 185.

fe Uie construction described above can be used if a remote speaker facility, ordering au ;; a loudspeaker, an amplifier and an electrical power source, is used with a miniature tape recorder that does not have a speaker and output amplifier and that is provided to be used with headphones.

Ij5 claims

BAD OBtQtHAL

2 0 9 8 2 5 / 0989-

Claims (2)

P 359 claims 1. Tape recorder with electrically operated ones that can be connected to this Ancillary devices, the tape recorder having a headphone jack and a remote switch jack, thereby characterized in that both sockets are connected to the power source of the tape recorder that they are used as a power source serve for the additional device. 2. Tape recorder according to claim 1, characterized in that the additional device is a loudspeaker device (21, 22) which comprises two plugs (23 * 24), the shielding contact of the first plug (23) with the plus side of the output circuit and with its center contact is connected, while the shielding contact of the second plug (24) is connected to the Srdseite of the output circuit and its center contact is connected to the input terminal of the output circuit (21). (Fig. 2). ' Sch / Kp ^O; BATH ORIGINAL 2 09 825/0989 ? Ί K 7 ο ^ _Ί . 3. Tape recorder according to claim 2, characterized in that a remote switch (25) is switched on between the center contact and the shielding contact of the first plug (23). (Pig. 3). 4. Tape recorder according to claim 1, characterized in that the additional device is a microphone device which has two plugs (3 ^ ·, 33) and a microphone (22) high impedance and a field effect transistor (33), wherein the grid of the field effect transistor ( A5) is connected to the microphone (32), while its output is connected to the shielding contact of the first plug (34) and the power source (1) is connected to the center contact of the second plug (35), the shielding contact of which is connected to the microphone (32) where the remote switch (~ j> 6) is connected between the center contact and the shield contact of the first connector (3 ¹ O). * (Pig. 4). 5. Tape recorder according to claim 4, characterized in that in the cables that connect the plugs (34, 35) to the microphone (32) and connect the field effect transistor (33), a decoupling circuit (41, 42) is connected, wherein the remote switch (42) in Decoupling circuit (41, 42) is arranged. (Fig. 5). P 359 209825/0989 -39- 6. Tape recorder according to claim 4, characterized in that a decoupling circuit (4l) a unit with the remote switch (42), wherein the uncoupling circuit (4l) and the remote switch (42) are connected between the lines, which lead to the microphone (32) and to the field effect transistor (33) and which are separated from the lines that direct the second connector (35) with the microphone (32) and the Connect field effect transistor (33). (Fig. 7). 7. tape recorder according to claim 1, characterized in that the additional device an FM tuner device with an FM tuner (55) is
and an antenna (56r » which has two plugs (57 * 58), the plus side of the FM tuner (55) being connected to the center contact of the first plug (57) and its shielding contact, while the earth string of the FM tuner (55 ) is connected to the shielding contact of the second plug (58), the center contact of which is connected to the output terminal of the FM tuner (Fig. 9). 8. Tape recorder according to claim J, characterized in that a circuit is provided, dureh the tape recorder is only operational when the FM tuner receives a signal from the FM transmitter. (Fig. 9). P 359 .-. 209 825/0989 9. Tape recorder according to claim 4 to 6, characterized in that the microphone device comprises a plug in which an electrical power source (67) is housed, viobei the center contact of the plug (66) with the source of the field effect transistor (33) and its shielding contact with one Kler.ime of the microphone (32) is connected, the other terminal of which is connected to the grid of the field effect transistor (33) and the ψ plus terminal of the electrical power source (67) with the output of the field effect transistor and its minus terminal with the shielding contact of the Connector (66) is connected. (Fig. 10). 10. Tape recorder according to claim 9 »characterized in that the inner contact of the plug (66) is connected to the source of the field effect transistor (33), the grid of which is connected to one terminal of the microphone (32), the k other terminal of which is connected the shielding contact of the plug (66) is connected, the plus terminal of the electrical power source (ff ^% ) being connected to the output of the field effect transistor (33), while its minus terminal is connected to the shielding contact of the plug (66) and the microphone (32) \ and the field effect transistor (33) are arranged on the outer surface of the main body of a tie pin and the electrical source (67 *) is arranged on the rear surface of the clamping part of the tie pin. (Fig. 16). BATH ORIGINAL 209 8 25/0989 11. Tape recorder according to claim 10, characterized in that the microphone device has a plug (66) which is designed so that it can be brought into engagement with the microphone socket, the center contact of the plug (66) with the source of the field effect transistor (33 ), the grid of which is connected to one terminal of the microphone (32), the other terminal of which is connected to the shielding contact of the plug (66) , the plus terminal of the electrical power source (67) also being connected to the output of the field effect transistor (33) is, while the minus terminal is on the shielding contact of the plug and wherein the microphone (32) is arranged on the outer surface of the main body (l4l) of a tie pin and the field effect transistor (33) is attached to its clamping part (l48), while the electrical power source is in Body of the plug is arranged.
(Fig, 20). 12. Tape recorder according to one of claims 9 to 11, characterized in that that the microphone device has a normally open micro switch (157) and a plug (66), which can be coupled to the microphone device ,, where BAD ORIGINAL '2 09825/0989 the middle contact of the plug (66) is connected to the source of the field effect transistor (33), the source of which is connected to one terminal of the microphone (32), the other terminal of which is connected to the shielding contact of the plug (66), wherein the terminal of the electrical source (67 ¹ * ) is connected to the output of the field effect transistor, while its minus terminal is connected to one contact of the switch (157) and the other contact of the switch (157) is connected to the shielding contact of the plug (66) and wherein the switch (157) is arranged in the body of the plug (68 ") and an elastic actuating member (ΐβΟ) is provided on the body (68"), which is actuated and closes the switch when the plug is connected to the socket of the Tape recorder is coupled.
(Pig. 23). 13. Tape recorder according to one of claims 9 to Hf thereby marked. shows that the center contact of the first plug (179) is connected to the negative terminal of the electrical power source (67 "), the plug of which is connected to the output of the field effect transistor (33), the grid of which is connected to one terminal of the microphone (32) , the other terminal of which is connected to the shielding contact of the second plug (66) whose 209825/0989 215785 7 Means contact with the source of the field effect transistor (33) and is connected to the shield contact of the first connector (179) with the shield of the second connector (66), whereby the electrical power source (67 ") is only applied to the field effect transistor (33) when the first (179) and the second plug (66) are connected to the corresponding sockets (5; 6) of the tape recorder,
(Fig. 26). 2 098 2 5/0989 HH Blank page