JPH024462Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention includes a first changeover switch that performs a switching operation during plug insertion, and a second changeover switch that performs a switching operation when plug insertion is completed. The present invention relates to a jack that ensures a time difference in switching timing and increases the contact force of the tip contact piece that contacts the tip electrode of the plug.

Usually, potable radios called "radio cassette players" that incorporate a cassette tape recorder into a transistor radio, etc., have a structure in which a speaker and a microphone are placed on the front panel, and when recording through the microphone, the speaker is Monitoring via the speaker will cause a howling phenomenon, so when a record button or the like is operated, a muting circuit is activated in conjunction with this to prevent sound output from the speaker.

However, there is a strong desire on the part of users to actually monitor the recording state with their ears when recording with a microphone, and there are some devices that allow monitoring using a headphone or the like.

In this case, for the purpose of improving operability, a changeover switch that operates in conjunction with the insertion of the plug is installed so that the output of the amplifier side can be automatically switched from the speaker side to the headphone side as soon as the headphone plug is inserted. In many cases, a switch built into the jack is used, but as mentioned above, when the record button is operated, the muting circuit operates at the same time, so a switch to cancel this muting operation is installed inside the jack. It needs to be built-in.

By the way, there is a switch between the switch for canceling this muting operation and the switch for switching the output from the amplifier side to the headphone side.
It is necessary to ensure a certain shift in switching timing. Now, if the changeover switch that cancels the muting operation when the plug is inserted switches earlier than the changeover switch that changes the output on the amplifier side, the mutating operation will be canceled before the speaker circuit is cut off, and the plug This results in a howling phenomenon, even if only temporarily, during insertion. Conversely, if the switch that changes the output on the amplifier side operates earlier than the switch that cancels the muting operation when the plug is removed, a howling phenomenon will similarly occur during removal of the plug.

In this type of plug and jack, the force that prevents the plug from coming off, so-called plug removal force, is determined by the contact pressure that acts between the plug-side conductor and the contact piece that contacts the plug-side conductor.
Therefore, in the past, in order to increase this removal force, for example, a coil spring or the like was inserted on the back of the tip contact piece that contacted the tip electrode on the plug side, and the elastic force of the tip contact piece was supplemented by this coil spring. There are some things. However, with this method, the number of parts increases, and the assembly work becomes complicated, resulting in an increase in product cost.

The present invention was developed in view of the above circumstances, and includes two types of mutually independent changeover switches that are operated by inserting and removing a plug in the jack, and the switching timing between the two changeover switches is fixed. By ensuring a time lag between
The object of the present invention is to provide a jack that can eliminate the howling phenomenon that occurs when inserting and removing a plug as described above, and can improve the plug removal force.

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

In the figure, 1 is a resin-molded jack case with an open rear end, and a cylindrical holder part 2 for plug insertion is provided protruding from the front wall 1a of the jack case. The sexual sleeve 3 is fitted. Reference numeral 11 denotes a ground contact piece that contacts the ground side electrode part P ₁ of the electrode parts of the plug P inserted into the jack case 1, and the main part 11 is in the shape of a rectangular plate.
The ends 11 are bent into a dogleg shape of a tongue portion 11b that extends from the front edge of the main portion 11a by press-fitting both side edges of a into a housing groove 12 provided in the jack case 1.
c faces into the cylindrical holder portion 2.

Further, a terminal portion 11d is made to protrude from the rear end portion of the main portion 11a in a direction perpendicular to the main portion 11a.

Reference numeral 13 denotes a ring contact piece that contacts the ring electrode part _P2 constituting the electrode part of one channel among the electrode parts of the plug P, and both side edges of the rectangular plate-shaped main part 13a are provided inside the jack case 1. A tongue piece part 13c is press-fitted into the housing groove 14 and punched out from the front end of the main part 13a at the lower rear part leaving one side remaining.
The terminal portion 13d is formed by extending the main portion 13a and bending the rear end portion of the main portion 13a at a right angle.

Reference numeral 15 denotes a tip contact piece that contacts the tip electrode part _P3 constituting the electrode part of the other channel among the electrode parts of the plug P, and the both side edges of the rectangular plate-shaped main part 15a are connected to the ground contact piece 11. Similarly, a tongue piece 15b is press-fitted into the housing groove 12 and punched out from the front end of the main part 15a in the upper rear direction from the main part 15a, leaving one side.
The terminal portion 15c is made to extend from the rear end portion of the main portion 15a in a direction perpendicular to the main portion 15a.

The ground contact piece 11 and the tip contact piece 15 are press-fitted into the same housing groove 12, but the ground contact piece 11 is placed on the front end side of the jack case 1, and the tip contact piece 15 is placed on the rear end side of the jack case 1. The two are separated from each other by being placed in the

Also, a pair of contact switches 16 constituting a first changeover switch are installed on both sides of the jack case 1.
and 17 are provided respectively.

The contact switch 16 is composed of a switching contact 18, a make contact 19, and a break contact 20. A contact portion 18c is provided by bending to have a step at the tip of a tongue portion 18b that is press-fitted and extends forward from the center of the main portion 18a at a predetermined angle with the main portion 18a. A separator 18d made of an insulating material is attached to the back side of the insulating material.

Further, a terminal portion 18e is integrally provided on the lower edge of the main portion 18a.

The make contact piece 19 is formed by press-fitting both side edges of a rectangular plate-shaped main part 19a into a housing groove (not shown), and
A tongue portion 19c is extended from the front edge of the tongue portion 9a, the tip of which is branched into two limbs and bent into a square shape to form contact portions 19b, 19b. Note that the contact portions 19b, 19b are the contact portion 18c of the switching contact piece 18 when the plug P is not inserted.
A predetermined gap is maintained between the plugs and the plugs so that they contact each other when the plug P is inserted. Further, a terminal portion 19d is integrally provided to protrude from the lower edge of the rear end portion of the main portion 19a.

The break contact piece 20 has a rectangular plate-like main portion 20a.
A notch groove 20b is provided at the center of the front end of the notch groove 2.
Contact portions 20c, 20c are provided at the upper and lower portions with the main portion 20a sandwiched therebetween, and both side edges of the main portion 20a are press-fitted into a housing groove (not shown). Further, a terminal portion 20d is integrally provided to protrude from the lower edge of the front end portion of the main portion 20a.

On the other hand, the armature switch 17 is also the armature switch 1.
Similarly to 6, the switching contact piece 18 of the contact piece switch 16,
It consists of a switching contact piece 25, a make contact piece 26, and a break contact piece 27, which are symmetrical to the make contact piece 19 and the break contact piece 20, respectively, and the same alpha alphabet is attached after each number in the corresponding part. explain.

Also, a cover 3 made of resin is integrally provided with a switch case 31 that accommodates a second changeover switch 30 on the back side of the opening 1b on the rear end side of the jack case 1.
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Further, a partition wall 33 is provided integrally with the cover 32 and separates the jack case 1 and the switch case 31 from each other.
A slit 34 is provided to communicate with the inside.

The cover 32 connects the jack case 1 with fitting convex portions 35, 35 protruding from the upper end of the partition wall 33.
The protrusions 36, 36 provided on both side edges of the base 37 of the cover 32 are fitted into the fitting holes 36, 36 provided on the top surface, and the protrusions 36, 36 provided on both side edges of the base 37 of the cover 32 are fitted into the fitting grooves 38, 38 provided on both side walls of the jack case 1. By fitting, the cover 32 can be fixed to the jack case 1.

Further, the base portion 37 is provided with through holes 39 through which the terminal portions of the contact pieces described above are inserted, and by inserting the respective terminal portions into the through holes 39, alignment of the terminals can be ensured. In other words, each terminal is covered with 3
By supporting the base portion 37 of 2, each terminal portion protrudes straight at a predetermined position, making it easy to attach it to a printed circuit board or the like.

By the way, the first changeover switch 30 includes a changeover contact piece 40, a make contact piece 41, a break contact piece 42, and a separator 43 made of an insulating material inserted between the changeover contact piece 40 and the break contact piece 42.

The switching contact piece 40 has a tongue piece portion 40b bent into an L-shaped cross section from the lower edge of the rectangular plate-shaped main portion 40a.
is extended and a T-shaped contact portion 40c is provided at the tip thereof.Both side edges of the main portion 40a are accommodated in accommodation grooves 44 provided on the inner wall of the switch case 31, and the main portion 40a is inserted into the jack case 1. It stands out. Note that the terminal portion 40d extends from one side of the main portion 40a and protrudes from the bottom of the switch case 31 to the outside.

The make contact piece 41 has a rectangular plate-like main portion 41.
A tongue portion 41b extends from the lower side of the switch case 31, and a T-shaped contact portion 41c is provided at the tip of the tongue portion 41b. 45 so that the tongue portion 41b projects into the jack case 1 through the slit 34, and the contact portion 41c
is opposed to the contact portion 40c of the switching contact piece 40 at a predetermined distance. Note that the terminal portion 41d extends from the lower side of the main portion 41a and the switch case 3
It is made to protrude outside from the bottom of 1.

Further, the break contact piece has a rectangular plate-like main portion 42a.
A tongue portion 42b extends from the lower side in a direction perpendicular to the main portion 42a, and a contact portion 42c that is branched into two limbs and bent downward is provided at the tip of the main portion 41a. Both side edges are accommodated in accommodation grooves (not shown) provided in the inner wall of the switch case 31, and the tongue portion 42b is made to protrude into the jack case 1 through the slit 34, and the contact portion 42c is inserted into the switch case 31. It is brought into contact with the contact portion 40c of the contact piece 40. Note that the terminal portion 42d extends from one side of the main portion 42a and protrudes from the bottom of the switch case 31 to the outside. Furthermore, the separator 43 is connected to the upper opening 31a of the switch case 31.
An operating section 43b having an L-shaped cross section extends from the lower side of the base section 43a, which also serves as a lid for closing the cell. A cylindrical protrusion 43c is provided in a protruding manner.

Further, the operating portion 43b is made to protrude into the jack case 1 through the slit 34, and the protruding portion 43c, which is the operating end, is inserted into the tip contact piece 15.
The tongue portion 15b is located close to the back surface of the tongue portion 15b. In other words, the plug P is inserted into the jack case 1,
The tip electrode portion _P3 of the plug P is connected to the tongue portion 15.
When b is pressed, the tongue portion 15b is pushed downward, the operating portion 43b also moves downward, and the contact portion 40c of the switching contact piece 40 separates from the contact portion 42c of the break contact piece 42 to make a make contact. Contact portion 41c of piece 41
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Note that a notch 47 having a semicircular cross section is provided on the proximal end side of the operating portion 43b of the separator 43 to increase the flexibility of the operating portion 43b.

Further, a pair of locking portions 48, 48 are provided on the front wall of the base portion 43a of the separator 43, so that when the cover 32 is locked to the jack case 1, the locking portions 48
8 and 48 are pressed by the opening edge on the rear end side of the upper end of the jack case 1 to prevent each contact piece constituting the separator 43 and the second changeover switch 30 from coming out of the switch case 31. That's what I do.

According to such a configuration, when the plug P is inserted into the jack case 1, the contact switches 16 and 17, which are the first changeover switches, are switched, and the changeover contacts 18 and 25 are switched to the break contacts 20 and 27. Then, it switches to the make contacts 19 and 26.

When the plug P is further inserted, the tip electrode portion _P3 contacts the tongue portion 15b of the tip contact piece 15, and the operating portion 43b of the separator 43 is pressed down.
The changeover switch 30 operates to switch the changeover contact piece 40.
is switched from the break contact piece 42 to the make contact piece 41 side.

That is, when the plug P is inserted, first the contact switches 16 and 17, which are the first changeover switches, are switched, and then the second changeover switch 30 is switched. Conversely, when the plug P is removed, the second changeover switch 30 first operates, and then the first changeover switch operates.

Therefore, according to the jack of the present invention, the first
contact piece switches 16 and 17, which are changeover switches for
A time lag in switching timing can be ensured between the switch and the second switch 30.

Next, one of the jack connection circuits based on the present invention will be explained.
An example is shown in FIG.

Both output terminals of amplifier R and amplifier L are connected to respective break contacts 20 and 27 of contact switches 16 and 17, which are first changeover switches, and to respective changeover contacts 18 and 25 of contact switches 16 and 17.
are connected to speakers 50 and 51, respectively. In addition, the break contacts 20 and 27 are connected to the chip contact piece 1 through attenuator resistors _R1 and _R2 .
5 and ring contact piece 13, respectively.
Further, lead terminals for canceling the muting operation of the muting circuit 52 are connected to the switching contact piece 40 and the break contact piece 42 of the second changeover switch 30, respectively.

Note that due to the difference in the muting operation cancellation method of the muting circuit 52, the lead terminal is connected to the switching contact piece 40 and the make contact piece 4 of the second changeover switch 30.
It can also be connected to 1.

To explain the operation of this embodiment, when recording is started by operating the normal recording button, the muting circuit 52 is activated at the same time, and the amplifier output becomes zero.

Next, when the headphone plug P is inserted into the jack case 1, the contact switches 16 and 17 that constitute the first changeover switch are operated to cut off the speaker circuits, and the amplifier R and amplifier L
Each output is switched to the headphone side.

Following this operation, the second changeover switch 30 performs a switching operation, so that the muting operation of the muting circuit 52 is canceled, and the amplifier R and amplifier L
The monitor output from is output to the headphone side.

During this time, since the speaker circuit is cut off before the muting operation is canceled, there is no risk of howling occurring when the plug is inserted.

Furthermore, even when the plug P is removed, the speaker circuit is connected after the muting operation is restarted, so there is no risk of howling occurring as in the case when the plug is inserted.

Further, according to the jack of the present invention, the operation end of the second changeover switch 30 is arranged on the back side of the tip contact piece 15, and the tip electrode _P3 on the plug side is in contact with the tip contact piece 15. , by its own elasticity, that is, by the elasticity of the switching contact piece 40 and the make contact piece 41 of the second changeover switch 30, the tip contact piece 15 is connected to the tip electrode portion _P3.
Since the tip contact piece 15 is biased in this direction, the contact force of the tip contact piece 15 with the tip electrode portion _P3 is improved, and the removal force of the plug is also significantly improved.

Moreover, there is no need to insert a coil spring or the like into the back side of the tip contact piece 15 as in the conventional case, and the second
Since the changeover switch 30 itself utilizes its own elastic force, no special parts are required and it can be manufactured at low cost.

FIG. 6 shows another embodiment of the present invention, in which a ring contact piece 60 and a tip contact piece 61 are provided with break contact pieces 62 and 63 constituting a first changeover switch.
The output ends of the amplifier R and the amplifier L are connected to the ring contact piece 60 and the chip contact piece 61, and the speakers 64 and 65 are connected to the break contact pieces 62 and 63, respectively.

Further, a second changeover switch 66 is provided on the back side of the tip contact piece 61 and is pressed by the tip contact piece 61 to move toward and away from the tip, and this second changeover switch 66 is connected to a muting circuit 67. .

Furthermore, the second changeover switch used to cancel the muting operation does not necessarily need to be a contact switch or the like as shown in the above embodiment.
Any material may be used as long as it is self-returning and has a strong restoring force.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing one embodiment of the present invention;
Fig. 2 is a sectional view of the same embodiment, Fig. 3 is a sectional view of the same embodiment showing the plug inserted state, Fig. 4 is a sectional view taken along line X-X' of the same embodiment, and Fig. 5 is a sectional view of the same embodiment. FIG. 6 is a circuit diagram showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Jack case, 2... Cylindrical holder part, 15... Chip contact piece, 16, 17... First changeover switch, 18, 25, 40... Changeover contact piece,
30...Second changeover switch, 18d, 25b,
43... Separator, P... Plug, P ₃ ... Chip electrode.

Claims (1)

[Scope of utility model registration request] a jack case 1 provided with a tip contact piece 15 that contacts at least a tip electrode P ₃ of a plug P;
Inside this jack case 1, from the plug insertion port side, the plugs are sequentially arranged at predetermined intervals in the plug insertion direction.
When the plug P is inserted, the switching contacts 18 and 25 are operated, and the first switching switches 16 and 17 are switched first. 40 is operated, this first changeover switch 16, 17
a second changeover switch 30 which is operated after the switching operation of the first changeover switch 16,
The switching contacts 18 and 25 of No. 17 are provided with separators 18d and 25d made of an insulating material that contact the plug P, and a flexible separator is provided on the side of the tip contact piece opposite to the surface that contacts the plug. The switching contact piece 40 of the second changeover switch 30 is provided through the separator 43 made of an insulating material, and when the tip electrode P ₃ of the plug P is in contact with the tip contact piece 15, the switching contact piece 40 is A jack characterized in that the tip contact piece 15 is pressed through a separator 43.