JP4951366B2 - Microphone output connector and condenser microphone - Google Patents

Description

 The present invention relates to an output connector for a microphone and a condenser microphone. More specifically, the present invention relates to a technique for preventing pin misalignment during assembly of an output connector.

  The condenser microphone has a built-in impedance converter such as an FET (field effect transistor) or a vacuum tube because the impedance of the microphone unit is extremely high. Normally, a phantom power supply is used in a condenser microphone, and a microphone sound signal is output via a balanced shield cable for the phantom power supply.

  In order to connect the above balanced shielded cable, the 3-pin type output connector defined in EIAJ RC-5236 “Sound Locking Round Connector for Acoustic Equipment” is provided on the microphone case (microphone grip for handheld microphone) side. Provided.

  By the way, if the microphone or microphone cable is exposed to strong electromagnetic waves with the balanced shield cable (microphone cable) drawn from the phantom power supply connected to this output connector, the electromagnetic waves enter the microphone from the output connector. The signal may be demodulated by the impedance converter and output from the icphone as audible noise.

  In particular, mobile phones that have been rapidly spread in recent years are considerably strong electromagnetic waves when used (for example, in the range of several centimeters to several tens of centimeters, tens of thousands of times the electric field strength generated in the city by commercial radio waves). Therefore, measures for mobile phones are an important issue in the field of microphones.

  The present applicant has proposed an invention relating to an output connector for solving this problem as Patent Document 1. This will be described as a conventional example with reference to FIGS.

  4 is a cross-sectional view showing the output connector, FIGS. 5A and 5B are plan views showing the front and back surfaces of the printed wiring board applied to the output connector as a measure against unwanted electromagnetic waves, and FIG. 6 is the printed wiring. It is a top view which shows the soldering state of each pin with respect to a board.

  As shown in FIG. 4, the output connector 10 includes a connector base 11 formed in a disk shape from a synthetic resin such as PBT (polybutadiene terephthalate). The connector base 11 has a first pin E for grounding and a signal signal. Three pins, the second pin SH on the hot side and the third pin SC on the cold side of the signal, are provided by press-fitting.

  In FIG. 4, the second pin SH on the hot side is disposed on the front side of the first pin E for grounding. Further, the connector base 11 is provided with a male screw 12 for fixing to the connector storage portion 20 shown in a chain line. The connector housing 20 is screwed to the end of a microphone case (not shown).

  The male screw 12 is moved outwardly in the radial direction of the connector base 11 by rotating with a screwdriver (not shown) from the opening 21 formed in the connector housing portion 20, and abuts on the edge of the opening 21. The output connector 10 is firmly fixed to the connector storage portion 20.

  In this conventional example, a printed wiring board 100 and a shield cover 200 are provided on the inner surface (surface disposed inside the microphone case) side of the connector base 11 in order to prevent electromagnetic waves from entering the microphone case.

  The printed wiring board 100 is a double-sided board. FIG. 5A shows a pattern on the lower surface (surface facing the inner surface of the connector base 11) 110, and FIG. 5B shows an upper surface (component mounting surface) 120. Side pattern is shown.

  As shown in FIG. 5, the printed wiring board 100 has three pin insertion holes, that is, a first pin insertion hole 101 through which the first pin E for grounding is inserted, and a second pin through which the second pin SH on the hot side is inserted. A pin insertion hole 102 and a third pin insertion hole 103 into which the third pin SC on the cold side is inserted are provided.

  Referring to FIG. 5A, on the lower surface 110 of the printed wiring board 100, except for the second pin insertion hole 102 and the third pin insertion hole 103, the shield layer 111 is substantially the entire surface as a solid pattern made of copper foil. Is formed over. The shield layer 111 shields an electromagnetic wave that tries to enter the microphone from between the pins of the connector base 11 through a microphone cable (not shown), for example.

  The shield layer 111 is non-conductive between the signal 2nd pin SH and the 3rd pin SC, but enters the first pin insertion hole 101 by through-hole plating and is electrically connected to the grounding 1st pin E. . In the second pin insertion hole 102 and the third pin insertion hole 103, through-hole plating is applied to ensure electrical continuity with the signal pins SH and SC.

  Referring to FIG. 5B, a shield electrode 121 is formed on the entire periphery of the upper surface 120 of the printed wiring board 100, and the shield electrode 121, the shield layer 111 on the lower surface side, and a plurality of through holes 122. Conducted through.

  Although the second and third pin insertion holes 102 and 103 are connected in parallel to the first pin insertion hole 101, in this example, the shield electrode 121 is interposed therebetween. That is, the first pin insertion hole 101 is connected to two locations of the shield electrode 121 by lead wires 123a and 123b extending in opposite directions from the edge.

  In contrast, the second pin insertion hole 102 is connected to the shield electrode 121 by the lead wiring 130, and the third pin insertion hole 103 is connected to the shield electrode 121 by the lead wiring 140. In this conventional example, A capacitor element 151 and a Zener diode element 152 are mounted in parallel on the lead wires 130 and 140, respectively.

  The capacitor element 151 is for preventing high-frequency intrusion, and the Zener diode element 152 is for preventing circuit destruction due to static electricity. Further, as shown in FIG. 4, a shield cover 200 made of, for example, press working of a metal plate is put on the upper surface 120 side of the printed wiring board 100.

  Although not shown, the shield cover 200 has three pin insertion holes through which the first pin E for grounding, the second pin SH for signals, and the third pin SC are inserted. Only the first pin E for soldering is soldered to the shield cover 200, and the second pin SH and the third pin SC for signal penetrate the shield cover 200 without contact with the shield cover 200.

  In this manner, by covering the upper surface 120, which is the component mounting surface of the printed circuit board 100, with the shield cover 200, high-frequency radiation from the wiring leading to the capacitor element 151 toward the inside of the microphone can be prevented. .

  This output connector 10 is a first step in which the printed wiring board 100 on which the capacitor element 151 and the Zener diode element 152 are mounted is disposed on the inner surface of the connector base 11, and the first to third pins E, SH, SC are printed wiring. Second step of press-fitting into the connector base 11 through each pin insertion hole of the board 100, connecting terminals formed in a ring around each pin insertion hole of the printed wiring board 100, the first to third pins E, SH, SC Assembling is performed through a third step of soldering 101a, 102a, and 103a (see FIG. 6) and a fourth step of covering the shield cover 200 and soldering the first pin E for grounding to the shield cover 200.

  In this assembling process, soldering is performed at three locations S1 to S3 between the pins E, SH, SC and the connection terminals 101a, 102a, 103a in the third process shown in FIG. 6, and the fourth process shown in FIG. The process is performed at four places in total at one place S4 between the first pin E for grounding and the shield cover 200 in the process.

  From the viewpoint of environmental protection in recent years, lead-free solder that does not contain lead tends to be used for soldering. However, in the case of lead-free solder, the melting point is high, so it is heated at a higher temperature for a longer time than conventional leaded solder. There is a need.

  For example, PBT resin having heat resistance is used as the material of the connector base 11. However, when the soldering is performed over three locations S1 to S3 in the third step and a high temperature is applied for a long time, the connector base 11 is used. The pin that is press-fitted into the screw may be loosened and displaced.

  In addition, since soldering must be performed within a limited space in the printed wiring board 100, careful attention is required not to come into contact with other pins or wiring. It takes time.

  In addition, the first pin E for grounding and the shield cover 200 are soldered in the fourth step, but the solder is reduced in volume (reduced meat) when it hardens, and a force that draws between the parts works. Particularly, regarding the first pin E for grounding, the displacement becomes larger when the press-fitting is loosened in the third step.

  When the microphone is used, the plug on the microphone cable side is inserted into the output connector 10. However, when the pin is loosened and displaced due to heat during soldering as described above, the worst plug cannot be inserted. Can happen.

  In addition, in a handheld microphone, the stress associated with the routing of the microphone cable is applied to the pin, but although the pin moves microscopically due to the stress, the soldered part causes poor contact, resulting in poor electrical contact noise. May occur. This poor contact noise occurs more frequently when the pin is loose.

JP 2005-311752 A

  Accordingly, an object of the present invention is to provide a grounding, signal hot-side and cold-side pins that are press-fitted into the connector base in a state in which printed wiring boards with unnecessary electromagnetic wave countermeasures are arranged on the connector base. In the microphone output connector, the looseness and displacement of the pin at the time of assembly are eliminated, and even if the pin is displaced by a stress applied from the outside at the time of use of the microphone, no contact failure noise is generated.

In order to solve the above-mentioned problems, the present invention provides a first pin for grounding, a second pin and a third pin used as a signal hot side and a cold side, and A connector base made of an electrical insulator having three press-fitting holes into which the pins are press-fitted, and a printed wiring board having three insertion holes through which the respective pins are inserted and provided with unnecessary electromagnetic wave countermeasures. Each of the pins is integrally provided with a head having a larger diameter than the insertion hole, a taper portion for preventing the press-fitting hole from being removed, and a pin body connected to the plug of the microphone cable, and one of the connector bases. the printed wiring board is arranged on the surface, each pin is press-fitted into said press-fit hole through the through hole from the printed circuit board side, and is press-fitted state held by the tapered portion Rutotomoni, each Down of the head is at the microphone output connector that is above the insertion hole electrically to the connection terminal formed in the connection around the printed circuit board, the pins of said head portion and said printed circuit board The connection terminal is electrically connected by a conductive washer fitted to the pin as an electrical connection means instead of soldering , and the washer is connected between the head and the printed wiring board. It is characterized by being clamped by the press-fit holding force by the taper portion .

In addition, as described in claim 2 , a dish-shaped or corrugated washer is preferably used for the washer.

Further, the present invention also includes condenser microphone includes a microphone output connector according to claim 1 or 2.

  According to the present invention, each of the pins 1 to 3 and the connection terminal formed on the printed wiring board are electrically connected not via soldering but via a conductive washer fitted on the pin. By doing so, the pins press-fitted into the connector base do not loosen.

  Further, since the washer has elasticity, even if the pin is microscopically displaced due to a stress applied from a microphone cable or the like, good electrical connection is maintained and no contact noise is generated. Further, since it is only necessary to fit the washer to the pin, the assembling workability can be greatly improved as compared with soldering.

  Next, an embodiment of the present invention will be described with reference to FIGS. 1 is an exploded perspective view showing an output connector according to the present invention, FIG. 2 is an enlarged perspective view showing a washer fitted to each pin, and FIG. 3A is a sectional view in an assembled state showing the output connector. 3 (b) is an enlarged cross-sectional view showing a main part of the present invention. In the description of this embodiment, the same reference numerals are used for components that may be considered the same as or the same as the attack examples described with reference to FIGS.

  As shown in FIG. 1, an output connector 10A according to the present invention is a connector defined by EIAJ RC-5236 "Latch Lock Round Connector for Acoustic Equipment", and its basic configuration is such as PBT (polybutadiene terephthalate). A connector base 11 formed in a disc shape from a synthetic resin, a first pin E for press-fitting into the connector base 11, a second pin SH on the signal hot side, and a third pin SC on the signal cold side It has three pins.

  In addition to the three press-fit holes 14a, 14b, and 14c into which the pins E, SH, and SC are press-fitted, the connector storage portion 20 (see FIG. 4) is provided in the connector base 11 as shown in FIG. A male screw 12 is provided for fixing to. In addition, when it is not necessary to distinguish each press-fit hole 14a, 14b, 14c, it is set as the press-fit hole 14 as a general term.

  Each of the pins E, SH, and SC is a pin having the same shape made of brass or the like, and includes a head portion P1, a reduced diameter portion P2, a tapered portion P3, and a pin body P4.

  Among these, the head P1 is disposed in a microphone case (not shown), and is connected to a predetermined terminal of an audio signal output unit provided in the case via a lead wire.

  The reduced diameter portion P2 and the taper portion P3 are portions embedded in the press-fitting hole 14, and the reduced diameter portion P2 has a slightly smaller outer diameter than the head P1 in order to escape meat during press-fitting. A step portion P2a is formed between P1 and P1. The taper portion P3 functions as a stopper.

  The pin body P4 protrudes from the outer surface side of the connector base 11, and a plug provided on a microphone cable (not shown) is detachably fitted.

  Also in the present invention, the printed circuit board 100 and the shield cover 200 are used as in the conventional example described above in order to prevent the external electromagnetic wave from entering the microphone case through the output connector 10A.

  The printed circuit board 100 is mounted with a capacitor element 151 for preventing high-frequency intrusion and a Zener diode element 152 for preventing circuit destruction due to static electricity, and three pin insertion holes 101 through which the pins E, SH, and SC are inserted. , 102, 103 are perforated.

  Around each pin insertion hole 101, 102, 103, connection terminals 101a, 102a, 103a that are electrically connected to the pins E, SH, SC are formed in an annular shape with copper foil. Other configurations of the printed circuit board 100 may be the same as those of the conventional example.

  In this output connector 10A, the printed circuit board 100 is placed on the inner surface of the connector base 11, and the pins E, SH, SC are press-fitted into the connector base 11 through the pin insertion holes 101, 102, 103 of the printed circuit board 100. After press-fitting into the holes 14a, 14b, 14c, the shield cover 200 is put on and assembled.

  FIG. 3A shows the assembled state. In the present invention, the electrical connection between the pins E, SH, SC and the printed circuit board 100 is made by the conductive washer 300 instead of soldering.

  That is, as shown in FIG. 1, before the pins are press-fitted, conductive washers 300 are fitted to the pins E, SH, SC, and the pins E, SH, SC are inserted into the press-fitting holes 14a, 14b, 14c. With the press-fitting, each washer 300 is brought into contact with the connection terminals 101a, 102a, 103a formed around the pin insertion holes 101, 102, 103.

  FIG. 3B shows an electrical connection state with the connection terminal 103a through the washer 300 of the third pin SC on the signal cold side. The same applies to the other pins E and SH.

  As shown in the enlarged view of FIG. 2, a flat washer can be used as the washer 300. Actually, when a washer with a thickness of 0.1 mm made of stainless steel (SUS304) was used, a good electrical connection state was obtained.

  In order to improve the reliability of the electrical connection between the washer 300 and the connection terminals 101a, 102a, 103a, the washer 300 is placed between the pin step P2a and the printed wiring board 100 as shown in FIG. It is preferable to pinch.

  In this way, the pins E, SH, SC and the connection terminals 101a, 102a, 103a of the printed wiring board 100 are electrically connected to the connector base 11 by performing the electrical connection with the washer 300 instead of soldering. There is no loosening of the pin. Therefore, problems such as poor plug insertion due to pin displacement do not occur as in the prior art.

  In addition, even if the pin is microscopically displaced due to the stress applied to the pin by the handheld microphone, even if the pin is microscopically displaced, the pin is connected to the printed wiring by the washer 300. There is no noise due to poor contact of the plates.

  In addition, it is preferable to use a dish-shaped washer or a corrugated washer that exhibits elasticity as the washer 300. According to this, even if the pin is microscopically displaced as described above, its displacement is caused by the elasticity of the washer. Therefore, the reliability of electrical connection can be further improved.

  Further, as shown in FIG. 3A, the first pin E for grounding is soldered to the shield cover 200 at a portion indicated by S4. However, the force that draws between the components due to volume reduction when the solder is solidified. Even if is operated, since the first pin E is firmly planted on the connector base 11, no displacement due to soldering occurs.

The disassembled perspective view which shows embodiment of the output connector by this invention. The expansion perspective view which shows an example of the washer applied to this invention. (A) Sectional drawing in the assembly state which shows the output connector by this invention, (b) is an expanded sectional view which shows the principal part of this invention. Sectional drawing which shows the output connector as a prior art example. The top view which shows each surface of the surface of a printed wiring board applied to an output connector as an unnecessary electromagnetic wave countermeasure means, and a back surface. The top view which shows the soldering state of each pin with respect to a printed wiring board in the said prior art example.

Explanation of symbols

10A Output connector 11 Connector base 12 Male screw 14 Press-fit hole 100 Printed wiring board 101, 102, 103 Pin insertion hole 101a, 102a, 103a Connection terminal 151 Capacitor element 152 Zener diode element 200 Shield cover 300 Washer
E Pin 1 for grounding SH Pin 2 on the hot side SC Pin 3 on the cold side

Claims (3)

A connector base comprising a first pin for grounding, a second pin and a third pin used as a signal hot side and a cold side, and an electrical insulator having three press-fitting holes into which the respective pins are press-fitted, Including a printed wiring board having three insertion holes through which each of the pins is inserted and in which unnecessary electromagnetic wave countermeasures are taken,
Each of the pins is integrally provided with a head having a larger diameter than the insertion hole, a taper portion for retaining the press-fitting hole, and a pin body connected to the plug of the microphone cable, and one surface of the connector base the printed wiring board is disposed above the respective pin is press-fitted into said press-fit hole through the through hole from the printed circuit board side, and is press-fitted state held by the tapered portion Rutotomoni, of each pin In the microphone output connector in which the head is electrically connected to the connection terminal formed around the insertion hole of the printed wiring board,
The head of each pin and the connection terminal of the printed wiring board are electrically connected by a conductive washer fitted to the pin as an electrical connection means instead of soldering , and the washer is An output connector for a microphone, wherein the output connector is sandwiched between the head and the printed wiring board by a press-fit holding force by the tapered portion . The microphone output connector according to claim 1, wherein the washer has a dish shape or a corrugated shape. Condenser microphone includes a microphone output connector according to claim 1 or 2.

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