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JPS55118395

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DESCRIPTION JPS55118395
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing an example of a car
radio equipped microcassette according to the present invention, and FIG. 2 is a circuit diagram
showing another embodiment of the same. M・・・マイクロカセット1. R・・・カーラジオ、
1A。 1B: stereo head, 2A, 2B: preamp, 3: monophonic reproduction main amplifier, 4: speaker,
5: internal battery, 6A to 6D, 6'A to 6 / D · · · Connection terminals, 7.8, 9, 11, ... switches, 10 ...
power switches, 12 ... changeover switches, 13 ... projections, 21 ... power supplies, 22 ... radio
circuits, 23A, 23B: main amplifier, 24A, 24B: speaker, 25.31 ° 32. 33A, 33B: switch, 26:
detector.
[Detailed description of the invention] This invention relates to a microcassette tape recorder of a
car radio wearing type and performs monaural reproduction at the time of usual use at 1% of the
portable radio, and when attached to a car radio, the car radio side It is intended to perform
stereo reproduction using a power supply and a speaker. . As is well known, the main feature of
the microcassette tape recorder is that it is easy to carry in a / "\ form. Therefore, this micro
cassette is to be avoided, as much as possible, from adding value-added functions to cause
enlargement. For example, a stereo reproduction in which a plurality of parts which can be
limited to miniaturization, such as a speaker, is required is an example. In the past, small-sized
and highly portable tape recorders were exclusively used, although only monaural reproduction
was possible. However, recently, even with such a microcassette one, there is no need to carry a
tape recorder, etc. In the room of a self-propelled car, etc., it is possible to enjoy stereo
reproduction that can enjoy excellent sound quality performance. There was a demand to be able
to do it. The car stereo mounted microcassette of the present invention has been proposed by
refinement as described above. A stereo cassette for left and right channels and its preamplifier
are incorporated into a microcassette, and a main amplifier and speaker for monaural
reproduction operated by internal battery are provided, while a force-radio is paired with a pair
of main amplifiers and a speaker connected thereto When carrying the microcassette, the audio
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signal from the stereo head is sent to the main amplifier to carry out monaural reproduction
from the speaker, while when the microcassette is mounted on a car radio, the left, right, and left
The audio signal of the channel is supplied to the main amplifier of the car radio and reproduced
in stereo from the speaker. Next, the present invention will be specifically described as 1i 5i +
based on the illustrated embodiment. In FIG. 1, the code M is a micro cassette. R shows a car
radio. In the microcassette M, stereo head + IIA, (++ n, its preamplifier f 21 A, (2) B, main
amplifier for monaural reproduction (3), monaural reproduction speaker (4), internal battery (5),
and car radio And connection terminals (6) A to (6) D. Among the connection terminals, (61A is
for the right channel, (6) B is for the left channel, f61c is for grounding, and + 61D is for external
power.
A switch (7) is disposed between one (--right channel as an example) of stereo hard (1) A and its
preamplifier (2) A. The 841 point t- preamp of this switch (7) (2) To A, connect the b contact to
the other (left channel)) preamp + 2) BKli-. The output terminal of the preamplifier for left
chicken drum + 21A is connected to the connection terminal (6) AK with the car radio, and the
power supply terminal of the preamplifier (21A) is connected to the connection terminal for
external power (61D) via the switch (8). On the other hand, connect the switch (9) to the output
terminal of the left chicken nel's preamplifier (2) B, and connect the a contact of the switch (9) to
the connection terminal (6) B at the back of the microcassette and monaural 7tb contact. Connect
to the main amp (3) for playback. Also, the power supply terminal of the preamplifier (2) B
extends this to the connection terminal (6) D for external power supply and, via the b contact of
the switch (8) and the power supply switch of the microcassette, Connect to). This internal
battery (5! To the power supply terminal of the monaural main speaker (3) is also connected, and
the b contact of the% L power supply terminal switch Oυ of the main amplifier (3) is connected,
and the switch 0υ is connected via the power supply switch OI. It connects to the internal
battery (5). The other end of the inner battery case is connected to the connection terminal (6) C
for external grounding as well as the connection. The respective switches +7) f8 + (91 and aυ
are interlocked with the changeover switch O2 that operates according to the insertion and
removal of the microcassette y with respect to the car radio, and are pushed by the projections
Q31 provided on the car radio RIill When the switch θ2 is activated, each switch i7i +) 1 · (9)
and 01) switches from the b-contact to the a-contact. Car radio R side, the source (211, of the
radio circuit. Connection terminals (6) A to (6) D corresponding to main amplifiers (2M, (HA) B
and suby, force a41A, hn, and connection terminals (6) A to (6) D of microcassettes for stereo
reproduction Set up. The switch (i) 2 is connected to the power source, and the contact b is
connected to the radio circuit C '21 and the contact a is connected to the connection terminal (6)
D to the microcassette. なお、スイッチ(ハ)は。 The sensor is operated by the command of a
detector that detects the mounting state of the micro cassette, and switches from the b-contact to
the a-contact when the micro cassette is loaded. また。 This power source is the main amp for
stereo playback (C) A, c!
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Also connect to 31B. The pair of output terminals taken out of the radio circuit are connected to
the main amplifiers (HA) A and (HA) B, respectively, and this main amplifier c13A. Connection
terminals f6 + A, (6: B) to the microcassette are connected to CI '31B. The microcassette of this
embodiment has the above-described configuration, and the operation thereof will be described
below. First, the microcassette M acts as a tape recorder for monaural reproduction in a state
where it is taken out from a car radio and carried. That is, when carrying the microcassette M,
the changeover switch 02 is not pressed against the protrusion (131 of the car radio R). f71 fs
B91 a υ uf b b contact I11. KiUt、”cイル。 When the C1 power switch 011 is turned on,
the power of the internal battery (5) is supplied to the left channel preamplifier (2) B and the
monaural reproduction main amplifier (3). Therefore, the audio signal from the recording tape
has a stereo head5. First, when adding to the fi + A and mB, the stereo head for the right channel
(4N picked up by IIA passes through the switch (7) turned to the b contact side to the Priane 7
'for the left channel (21B) After being supplied there and amplified with the signal from the left
channel stereo head (1) B. A monaural signal is supplied to the main amplifier (3) through the
contact b of the switch (9) and is output as an audio output from the speaker (4). In this case, on
the side of the car radio R with the microcassette M removed, the switch □□□ switches to the b
contact side by the command of the detector し た which confirmed the absence of the
microcassette, and the radio circuit QzK power supply Qυ The voltage is applied and the radio
circuit 2 operates. Therefore, the output from the radio circuit (C) is the main amplifier (21A). (C)
After being amplified by B, speaker! It is loudened to the outside from 241A and C141B. On the
other hand, when the microcassette M1 is mounted in the car radio R, as shown in FIG. 1, the
projections 0 to 63 of the car radio push the changeover switch O2 of the microswitch. The
respective switches + 71 + 81F9) αυ are switched to the alli point, and on the car radio R side,
the switch C) 51 is switched to the a contact according to a command from the detector (c). At
the same time, the connection terminals (6) A to (6) D provided in the microcassette M are
present. The connection terminals (6 · A to (6) D of the car radio R are respectively connected. In
this state, the voltage of the internal battery (5) of the microcassette has not been applied to the
monaural reproduction main amplifier (3) since the switch αυ has been switched to the ai
point, so monaural regeneration of the microcassette is Not done.
Further, in the car radio R, since the switch ~ is connected to the a contact, the radio circuit F3 is
not supplied with power and does not operate. However, the preamplifier (2) A in the
microcassette M. (2) For BK, a car radio power supply is supplied via the switch (d), connection
terminals + 61D, + 61D, (and the switch (8)), so one preamplifier + 21A, (21B1) Can operate.
Therefore, when the audio signal from the recording tape is applied to the stereo heads fllA and
fllB, the stereo head for the right channel (the signal picked up by IIA passes through the switch
(7) switched to the a contact and passes through to the preamplifier (2) A Join. After being
amplified here, it passes through the connection terminals + 61A, f61A and the main amplifier Q
to A in the car radio R and comes out from the speaker 041A as an audio output of the right
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channel. On the other hand, the signal ti from the left channel stereo head (1) B is added to the
preamplifier (2) B as it is and amplified there, then the a contact of the switch (9), connection
terminals +61 B, f 61 B, and car radio Since it comes out as an audio output of the left channel
from the speaker 241B through the main amplifier (ha) B in R, both speakers c241A, G! Stereo
reproduction is performed by the sound of 41B Kara. The car radio equipped microcassette of
the present invention. By way of example, while having the construction and operation as
described above, a first alternative embodiment will now be described according to FIG. In the
first embodiment described above, the stereo head (IIA, (a modification from IIB was
concentrated on one preamplifier (2) B) by using the switch (7) as the 1 j before amplification But
this second embodiment 1, both stereo heads (1) A, preamp + 21 A respectively from the signal
from fllB. (2) Lead to B, and after amplification, short each pair. It is sent to the main amplifier (3)
for monaural reproduction as a monaural signal. That is, a switch 0υ is connected to the output
terminal of the right channel preamplifier (21A, the at & point of this switch Gυ is connected to
the connection terminal (6) A with the car radio R, and the b contact is to the main amplifier for
monaural writing (3) Connecting. The main ito 3t-is connected to the output terminal of the left
channel preamplifier (2) B, and its ai point is connected to the connection terminal (6) B with the
car radio R, and its b contact is the preamplifier (2) A Make a short circuit to the b contact of 9
switches 6 附 attached.
Meanwhile, each preamplifier + 21A, (21Ba it 3k. As it is connected to the connection terminal
for external power supply (61D. It is also connected to the internal battery (5) via the power
switch 翰. Further, to this internal battery (5), the power supply terminal of the monaural
reproduction main amplifier (3) is connected via the switch a and the power supply switch (101)
as in the first embodiment. Also in the second embodiment, the switch 03 operated by the
projection 03 of the car radio is provided as in the first embodiment, and each switch is
interlocked with the force of the switch 0 when the microcassette M is attached. 01) (To), and let
0υ switch a to a blink. Also, switches (G) A and COB are attached to the input ends of the main
amplifiers Q3A and (C) B on the car radio R side. Its a contact point micro power set) M
connection terminal siA. (6) Connect B and the b contact to a pair of output terminals extending
from the radio circuit (2). This switch α31A, αIB. In accordance with the instruction of (4)
detection of the presence of the micro cassette M similarly to the switch (c) for power supply
switching installed in the car radio R according to the rule, the b contact to the a contact side
Switch to The operation of the micro-cassette of the second embodiment having such a
configuration will be described as the first order. When carrying the microcassette M, turning on
the power switch αe adds the voltage of the internal battery (5) or the left and right preamps
f21A and + 2 + BK, and at the same time, plays monaural through switch 0υ switched to b &
point side Also added to the main amp (3). Therefore, when the audio signal from the recording
tape is applied to the stereo heads fllA and fllB of the left and right channels, this signal passes
through the switch pupa switched to the b contact side after being amplified by the respective
preamplifiers 12iA and (21B. Then, they are short-circuited with each other to be supplied as a
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monaural signal to the main amplifier (3) and to be loud-sounded from the speaker (4). In this
case, since switches (c) and (d) A, (d) are both connected to the Kb contact side according to the
instruction of the car radio Rti and detector (c), there is no power supply to the radio circuit Q3.
With 5 added, the signal from the radio circuit is the main amplifier 12: (IA, (fl supplied to 231 B
respectively, 1 c! 41A, c241 BK- Followed by loud voice. On the other hand, when the
microcassette M is attached to the car radio R, all the switches ctuc + aa 内 in the microswitch
are switched to the a-contact by the action of the changeover switch 0220 suppressed by the
projection 09.
Further, each switch 125ICAM, C (31B is also switched to the a-contact) in the car radio R
according to a command from the detector. As a result, the power supply to the radio circuit 断 is
cut off, and the voltage of the power source Qυ is switched to the preamplifier 12 + A of the
microcassette M through the switch terminal を 通 じ て, the connection terminal + 61D, and (6)
D. Activate this. Therefore, when the audio signal from the recording tape is applied to the
preamplifier + 2) Aj 21 B through the left and right stereo heads (1) A, (1) B, the signal is the a
contact of the switch ellt 32, the connection terminal (6 + A, + 61 B and t6 r *, Te) n, the left and
right main amplifiers e 141 A, c! Provided in the car radio R via the a-contacts of the switches (d)
A, (b) B sequentially. After being amplified by (B) B, the speakers [with] A, (stereo reproduction
through (241B). As shown in each of the above embodiments, the microcassette of the present
invention performs monaural reproduction at the time of carrying. At the time of attachment /
detachment to a car radio, stereo reproduction is performed using a main amplifier and a speaker
on the car radio side. Therefore, according to the present invention, since it is not necessary to
incorporate all the mechanisms for stereo reproduction in the microcassette, it is possible to
exert the features of the small and highly portable microcassette to light and at the same time the
car When attached to a radio, superior sound quality can be obtained by stereo reproduction.
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