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DESCRIPTION JPS55169617

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DESCRIPTION JPS55169617
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an equivalent circuit diagram of a main part of
a tape recorder provided with an earphone jack according to an embodiment of the present
invention, FIG. 2 is a rear view of the earphone jack of the embodiment, FIG. The figure is a crosssectional view taken along the line II-- in FIG. 2, FIG. 4 is an equivalent circuit diagram similar to
FIG. 1 related to the earphone jack according to another embodiment, and FIG. It is a rear view of
the earphone jack. 1 ииииии Muting switch, 1a иии и и и Movable contact piece, 1b и и и и и и и и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и и и и и и и и и и и и и и и и и и и 2 ... Movable contact, 2b и и и и и и и Fixed contact.
DETAILED DESCRIPTION OF THE INVENTION The present invention is an earphone jack for a
tape recorder provided with a miter tinter switch and an earphone / speaker selector switch, and
operating the miter tinter switch in conjunction with the switching function of the earphone and
the speaker. In general, as an earphone shutter of the present invention, one that is configured so
that the mute switch and the earphone / speaker changeover switch are turned on directly when
the earphone plug is inserted, is known. . Then, both switches are operated by the mini-ting
switch after the earphone / speaker changeover switch is turned on, that is, after the connection
with the reproduction amplifier is switched from the speaker to the earpiece 4i town) It is desired
for prevention. However, it is difficult to ensure that the operation timings of both switches are
satisfied with the above-mentioned request by means of an earphone jack in which both switches
are driven by a plug as in the prior art. I и Ulling due to fatigue, deformation? And there are two
disadvantages: Therefore, for the purpose of this proposal, the mini-ting switch can be activated
after the operation of the earphone / speaker changeover switch even with some manufacturing
errors, fatigue due to use, or deformation, and it is possible to reliably prevent /) wringing It is to
provide an earphone jack for a tape refender. An earphone jack according to an embodiment of
the present invention will be described below with reference to the attached drawings. FIG. 1 is a
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circuit diagram of the muting switch incorporated in the earphone jack and the relationship
between the earphone switch 1j2 switcher switch and other circuit elements of the tape recorder.
In the figure, reference numeral J0 denotes a reproduction amplifier. One input end of t is
connected to a power source JJ [adhered, and the other input end is connected to a flexure of a
transistor 2 whose emitter is grounded h. Then, the fixed contact piece 1b of the base Kid
reducing switch ? of the transistor 12 is connected, and the switch 1 of the switch 12 is closed.
Meanwhile, before i. (Power end is earphone ? ? ? ? ?, l; ????? E, ? W ? t ? ? ? (?
? ? ? ? ? ? ? bt bt bt bt bt bt bt bt bt bt bt bt bt bt * * * * * * * j j j j j j j j j The first contact
piece 2e and the movable contact piece 311 are electrically separated from each other.
In the circuit configured as described above, the recording mode PC switching is performed from
the L8IK (not shown) to make the mechanical switch unnecessary. At the same time, by inserting
the earphone plug into the jack at the same time as the recording monitor, the movable contact
piece 2a of the earphone j and the f-force switch 2 is moved first, and it is forcefully separated
from the fixed contact piece 2b for the speaker. Instead, they are electrically connected to the
earphone fixed contact piece 2c. Then, the movable contact piece 1a of the muting switch 1 is
moved by this movement and electrically connected to the fixed contact 1b. As a result, the
transistor 120 pace is grounded and the conduction L-1 is activated to enable the recording
monitor. In this series of operations, it is necessary to prevent the howling that the mating switch
1 is turned on after the on / off operation of the earphone / speaker changeover switch 2, and
the arrangement shown in FIG. This operation is ensured in the earphone jack. A housing made
of synthetic resin is shown according to the figure, and the inside of the buying hole is provided
with the outpost muting switch 1 and the earphone / speaker switching switch as described
below. 2 is provided. The movable contact piece 1 and the proximal end of the mute switch 1 are
fixed by being inserted into a recess f formed at one lower side in the NORJING j3, and the free
end crosses the through hole of the housing 30. It has been extended. The quantity fixed contact
piece 1b is formed in a U-shape and fitted and fixed to the state side ?C formed recess in the
housing 3 and the lower end portion is opposed to the free end of the front F movable contact
piece JaC1 and is 7 . Thus, when the free contact # 1 of the movable contact 1a is pushed down,
it abuts on the lower part of the contact + 1-foot contact 1b and the switch 1 is turned on. An
electrically insulating member 4 is attached on the movable contact 7s of the switch l, on which
the free end of the movable contact 2IL of the front P earphone / nu-force switch 2 is located.
ing. In this embodiment, the free end of the movable contact 2 and the insulating member 4 are
in contact with each other in advance, but it is essential that the free end of the movable contact
2 and the insulating member 4 be located near each other. The movable contact piece 2a is
formed with a cut-and-raised portion at the base end portion of the dwarf, and this and the
central portion of the contact piece 211 are respectively fixed to the front and back sides in the
housing 3 by pressing K I'm lying. The fixed contact piece 2b of the switch 2 is fixed to the recess
formed on the upper side of the housing 3 by press-fitting its base portion.
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And, as is apparent from FIG. 3, before the plug is inserted, it is in electrical contact with the free
end of the front F movable contact 2a. The second fixed contact piece 2c of the switch JO, that is,
the fixed contact piece for earphones is protruded from the plug insertion opening of the housing
3 as in the prior art. In the jack having the above configuration, when the Kf plug is inserted as
shown by the phantom line in FIG. 3, the movable contact piece 2a of the earphone / speaker
changeover switch 2 is pushed down by the tip t + o tip to fix the first The electrical connection
with the contact piece 2b is broken and turned off, and the movable contact piece 1m of the
mini-ting switch J is pressed down via the insulating member 4 by the depression of the movable
contact piece 2a and the fixed contact thereof It is electrically connected to the piece 1b. That is,
the earphone j speaker switch 2 is actuated by the plug jK, and the microphone switch J is
actuated by this switch 20 #. As a result, these switches 1.2 are operated in a reliable manner
one after another regardless of their timing accuracy and fatigue and deformation of the contact
piece due to use. In the above example F, although the case where the mini-tapping switch 1 or
the syn- chronous feed is turned off is described, the earphone plug is turned on beforehand and
turned off when the insertion is tl. An example is described with reference to FIGS. 4 and 5. In
FIG. 4 showing an equivalent circuit similar to FIG. 1, the miter switch 1 is directly connected to
the base of the transistor 11 to which the 7 amplifier 10 rIC collector is connected, and the
switch l is turned on. Sometimes the #: The fxo is turned off so that it is not activated. The jack
shown in FIG. 5 has a configuration for the above circuit, and the free end of the movable contact
1 of the mini-ting switch 1 is biased upward by its own elasticity 71 and fixed contact Jb. In
contact with the top of the The insulating member и attached to the upper surface of the movable
contact piece 1a, -1: "4 has a predetermined distance j above it, and the movable contact piece 2a
of the earphone / speaker switching switch 2 Is located. As in the first embodiment, the movable
contact piece 2a is in electrical contact with the fixed contact piece 2b, and the speaker 3 and the
pin J0 are electrically connected to each other. In the jack having the above-described
configuration, when the earphone plug is inserted and enjoyed, the movable contact 2 & of the
earphone / speaker changeover switch 2 is pressed, and the switch 2 is turned off. [1] When the
predetermined distance is pressed, the movable contact piece 1m of the meeting switch 1 is
completely pressed down via the insulating member 4, and the free end of the harrow C
separates from the fixed contact piece 1b.
As a result, this muting switch J is also turned off, and monitoring by the earphone becomes
possible. Qi related to this invention described above! In the earphone jack for referrer, the
earphone / speaker switch is operated by the earphone plug, and the miee-tainder switch is
operated by this operation, so even if there are some manufacturing errors in the parts
constituting the switch, Even if fatigue or deformation occurs due to prolonged long-term use,
housing can be reliably prevented and monitoring by earphones can be made possible.
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