JP2010278842A - Earphone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a canal type earphone which can prevent the generation of atmospheric discharge and surface creepage. <P>SOLUTION: The length of the fitting portion between a front case 1 and a rear case 17 which house a speaker 5 is lengthened, a sound aperture formed by the front case 1 and an ear chip 2 fitted to the front case 1 is lengthened, and the length of a neck-like portion 17a in which a cable through-hole of the rear case 17 is formed is lengthened, so that the discharging path of the atmospheric discharge as well as the discharging path formed by the atmospheric discharge and the surface creepage are made to be 10 mm or more in length. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an earphone, and more particularly to an electrostatic discharge prevention means thereof.

  An example of a conventional earphone will be described with reference to FIGS. 6 is an exploded perspective view showing an example of a conventional earphone, FIG. 7 is a perspective view showing a discharge location of the earphone, FIG. 7A is a perspective view seen from the front side, and FIG. 7B is a rear side. It is the perspective view seen from.

  This earphone is an inner-type earphone that is inserted into an ear hole, and accommodates a speaker 101 to which a cable 102 is connected by fitting a front case 103 and a rear case 104 with a fitting portion 104c. The front case 103 is arranged at the ear hole entrance position, and the sound generated from the speaker 101 is used as a state where the sound is transmitted to the ear through the sound path 103a of the front case 103.

  The static electricity generated by friction with clothes during the dry period and accumulated in the human body is discharged when the potential difference between the conductor part of the electronic device having the ground level potential becomes the discharge start potential difference. There are two types of discharge: air discharge, which has a discharge path in the air, and creeping discharge, which has a discharge path along the surface of the dielectric (insulator). Greater than the spatial distance of

  In the case of the earphones shown in FIG. 6 and FIG. 7 described above, the human body discharges to the metal part of the speaker 101 or the soldered part of the cable 102. The discharge path is from the ear through the sound path 103a of the front case 103 to the speaker. When the rear case 104 is plated, the air discharge to the metal part of the speaker 101 via the plating when the plating 104b is touched by hand, or the air of the rear case 104 Air discharge to the metal part of the speaker 101 when the hole 104a or the cable insertion hole 104 is touched by hand, or creeping discharge to the metal part of the speaker 101 when the fitting part 104c of the rear case 104 is touched by hand. Arise.

  And in this conventional speaker, since measures to increase the spatial distance of the air discharge and the creepage distance of the creeping discharge are not taken, the discharge from the human body is likely to occur, and when the discharge occurs, discomfort, pain, Symptoms similar to burns may occur.

  The electroacoustic transducer disclosed in Japanese Patent Application Laid-Open No. 62-91100 is a handset receiver. An example is shown in FIG. In the speaker 231 shown in FIG. 8, a front case 238, a partition plate 232, and an attached body (handset) 233 are stacked on the front side of the vibrator 235. A front air chamber 236 and a rear air chamber 237 are formed above and below the vibrator 235, respectively, and the semiconductor circuit 234 is connected to the vibrator 235.

  In this electroacoustic transducer, the positions of the sound hole 239, the sound hole 240, and the sound hole 241 provided in the front case 238, the partition plate 232, and the mounted body 233 are shifted. The space distance of the air discharge when discharging from the human body to the speaker 231 or its soldering portion becomes oblique and long because it passes through each sound hole.

  In the electroacoustic transducer disclosed in Japanese Patent Laid-Open No. 62-91100, the path of the air discharge is only slanted. Therefore, a pad-type earphone with a short distance between the speaker 231 and the attached body 233 has sufficient space. It is difficult to be a distance. Or, in order to obtain a sufficient spatial distance, the thickness direction dimension of the earphone is increased, and there is a problem that the product becomes larger and the weight increases. In addition, measures against creeping discharge were not taken.

JP-A-62-91100, specification, pages 2 to 3, FIG.

  The present invention has been made in view of the above points, and an object thereof is to provide a pad-type earphone and a canal-type earphone that can prevent the occurrence of air discharge and creeping discharge.

The canal-type earphone according to the present invention is a canal-type earphone including a speaker inside a case. When
The length of the discharge path formed in the fitting portion between the front case and the rear case that accommodates the speaker, and the length of the discharge path formed in the fitting portion between the rear case and the bush that holds the cord The length of the discharge path formed in the cable insertion hole in the bush;
The length of the discharge path from the air hole provided in the rear case to the metal part of the speaker is set to 10 mm or more.

  In the canal type earphone, the outer surface of the front case and the rear case is not plated.

  The pad type earphone of the present invention forms a speaker accommodation space for accommodating a speaker by fitting a front case and a rear case, and in the pad type earphone in which a pad portion is attached to the front case, at the center of the front case A central closed portion is formed, a plurality of external insertion holes are formed around the central closed portion, and a cylindrical rib provided with a notch extending from the periphery of the central closed portion toward the speaker housing space is provided. In the air formed between the metal portion of the speaker and the pad portion, the edge of the central portion of the sound path diaphragm component interposed between the front case and the speaker is brought close to the surface of the central blocking portion. The discharge path formed by discharge or creeping discharge is 10 mm or more.

  Further, in the pad type earphone, when a path of air discharge or creeping discharge formed between an external surface of the pad type earphone and a metal part of the speaker is a discharge path, a front case for housing the speaker; The length of the discharge path formed in the fitting portion of the rear case, the length of the discharge path formed in the fitting portion of the rear case and the bush holding the cord, and the cable insertion hole in the bush The lengths of the discharge paths formed are each 10 mm or more.

  Further, in the pad type earphone, in the pad type earphone provided with a speaker inside the case, an air hole between the inside of the case and the outside of the case is provided by providing a slit in a fitting portion between the front case and the rear case for housing the speaker. Is formed.

  In each of the pad type earphones, the outer surface of the front case and the rear case is not plated.

  According to the earphone of the present invention, even if it touches the human body, no electrostatic discharge occurs, so that the user is not uncomfortable.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a canal-type earphone that is Embodiment 1 of the present invention, with a half cut away. It is a disassembled perspective view which cuts out the canal type earphone by half and shows it. It is sectional drawing which cuts off and shows the pad type earphone which is Example 2 of this invention half. It is a disassembled perspective view which shows the pad type earphone. It is a disassembled perspective view which cuts out the same pad type earphone by half. It is a disassembled perspective view which shows the example of the conventional earphone. It is the perspective view which shows the discharge location of the same earphone, Fig.7 (a) is the perspective view seen from the front side, FIG.7 (b) is the perspective view seen from the rear side. It is sectional drawing which shows the other example of the conventional handset receiving part.

  Hereinafter, modes for carrying out the present invention will be described with reference to examples.

  FIG. 1 is a cross-sectional view showing a canal (sound hole) type earphone according to Embodiment 1 of the present invention with a half cutaway, and FIG. 2 is an exploded perspective view showing the canal type earphone with a half cutout. The front case 1, the rear case 17, and the resin holder 28 shown in FIG. 1 or FIG. 2 are rigid structural members that are insulators, and are formed of synthetic resin. The ear tip 2 is formed of a soft insulator.

  The speaker metal portion (yoke) 6 fitted to the resin holder 28 is formed in the front case 1 in the internal space formed by fitting the rear case 17 and the front case 1 with the fitting portions 17e and 1a. It is housed in a held state. Note that the outer surfaces of the rear case 17 and the front case 1 are not plated to prevent electrostatic discharge.

  Further, the bush part 22 made of rubber is inserted into the bush part insertion hole 17c formed inside the neck-shaped part 17a of the rear case 17, and the tip of the cable 19 through which the cable through hole 22b of the bush part 22 is inserted is covered. The conductor exposed portion 19a from which the solder is peeled is soldered to the board pad portion 29.

  A nylon dustproof net 3 is attached to the entrance edge of the front case 1, and a sound-absorbing sponge 4 is packed in a space surrounded by the front case 1 behind the dustproof net 3. In the figure, the sound deadening sponge is not drawn, and a space filled with the sound deadening sponge 4 is given a reference numeral.

  The discharge path of the canal-type earphone is indicated by arrows A to F in FIG. 1, and the reference numerals a to f of the portions surrounded by dotted lines so that the discharge path configuration portion corresponds to the arrows A to F of the discharge path in FIG. It is shown in

  The discharge path A is an air discharge path that passes through the air and dust-proofing net 3 and the muffling sponge 4 and reaches the speaker metal part 6. By adopting the resin holder 28 on the sound path side of the speaker, the sound path length is reduced. It is equivalent to a conventional product, and the discharge path A can be 10 mm or longer.

  The discharge path B is an air discharge and creeping discharge path from the lower edge of the skirt portion of the ear tip 2 to the inside of the skirt portion and the air hole 5 of the rear case 17 to the speaker metal portion 6. Therefore, the discharge path B can be 10 mm or longer.

  The discharge path C is a path of creeping discharge and aerial discharge that passes through the fitting portions 1a and 17e and reaches the board pad portion 29 or the speaker metal portion 6, and the discharge path C is set to 10 mm by lengthening the fitting portions 1a and 17e. It can be set as the above length.

  The discharge path D is a path of creeping discharge and air discharge that passes through the air hole 17b provided in the rear case 17 and reaches the conductor exposed portion 19a. This path has a length of 10 mm or more by making the air hole 17b longer. Can be of length.

  The discharge path E is a path of creeping discharge and air discharge of the bonding portion 17d with the bush part 22 that contacts the bush part insertion hole 17c of the rear case 17, and the discharge path E is increased by making the bush part insertion hole 17c longer. E can be a length of 10 mm or more.

  The discharge path F is a path of creeping discharge and air discharge that passes between the cable 19 and the cable passage hole 22a of the bush part 22 and the hole of the rear case 17 and reaches the board pad portion 29 or the conductor exposed portion 19a. The length of the discharge path F can be made 10 mm or longer by lengthening the neck-shaped portion 17a of the rear case 17 and the cable passage hole 22a of the bush 22.

  Even if the plug connected to the tip of the cable 19 of the canal type earphone of the first embodiment configured as described above is grounded and a voltage of +10 kV / −10 kV is applied to the outer surface of the earphone with an electrostatic surge tester, discharge is generated. Did not occur.

  Further, even when the earphone was attached to the human body and a voltage of +10 kV / −10 kV was applied to the plug with an electrostatic surge tester, no discharge pain was felt.

  3 is a cross-sectional view showing a pad-type earphone according to a second embodiment of the present invention by cutting it out in half, FIG. 4 is an exploded perspective view showing the pad-type earphone, and FIG. 5 is an exploded view showing the pad-type earphone in half. It is a perspective view.

  The front case 9 and the rear case 20 shown in FIG. 3, FIG. 4, or FIG. 5 are insulating rigid body structural members and are formed of synthetic resin. The sound path diaphragm component 10 is formed of a soft insulator. And the speaker metal part 8 fitted by the front case 9 is accommodated in the internal space formed by the rear case 20 and the front case 9 being fitted by the fitting parts 20c and 9f. The outer surfaces of the rear case 20 and the front case 9 are not plated to prevent electrostatic discharge. The front side of the front case 9 is covered with a sponge-like ear pad 7.

  Further, the bush part 22 made of rubber is inserted into the bush part insertion hole 20b formed inside the neck-shaped part 20a of the rear case 20, and the end portion of the cable 19 through which the cable through hole 22a of the bush part 22 is inserted is covered. The conductor exposed portion 19a from which the solder is peeled is soldered to the board pad portion 29.

  As shown in FIG. 4, slits 9 c, 9 c... Functioning as air holes are formed at equal intervals on the outer surface of the cylindrical rib of the front case 9. A disk-shaped central blocking portion 9b without a hole is formed. Around the central blocking portion 9b, ribs divided into partial cylindrical shapes by six notches 9e, 9e,... Shown in FIG. Further, a plurality of external insertion holes 9a, 9a are provided at equal intervals on the outside of the central blocking portion 9b.

  A central hole 10a that forms a cylindrical inner surface is formed at the center of the sound path diaphragm component 10, and the edge of the central hole 10a is close to the plane of the central blocking portion 9b of the front case 9.

  The discharge path of this pad-type earphone is indicated by arrows G to J in FIG. 3, and the reference numerals of the portions surrounded by dotted lines so that the discharge path constituent parts correspond to the arrows G to J of the discharge path in FIGS. It is shown by gj.

  The discharge path G passes through the sponge-like ear pad 7, passes through the external insertion holes 9 a, 9 a... Of the front case 9, the peripheral surface of the space 9 d between the front case 9 and the sound path diaphragm component 10, the notch 9 e, This is a path of creeping discharge and air discharge passing through the inner surface of the center hole 10a of the diaphragm part 10 and reaching the speaker metal part 6, and this path is opposite in the direction between the front case 9 and the sound path diaphragm part 10. The discharge path G can be made to have a length of 10 mm or more even if the thickness of the portion covering the ear is reduced.

  The discharge path H is a path for air discharge and creeping discharge that enters the inside of the front case 9 from the front case 9 and the rear case 20 fitting portions 9f and 20c and reaches the speaker metal part 8, and this path is the path of the front case 9. It is folded back so that the directions are opposite to each other before and after the cylindrical rib, and the discharge path H can be 10 mm or longer. Further, by providing the front case 9 with the slit 9c, the function of the air hole on the rear side of the speaker can be obtained.

  The discharge path I is a path of creeping discharge and air discharge that passes between the cable 19 or the conductor exposed portion 19a and the cable through hole 22a of the bushing part 22 and the hole of the rear case 20 and reaches the board pad portion 29. The discharge path I can be made 10 mm or longer by increasing the length of the neck-shaped portion 20a of the rear case 20.

  The discharge path J is a path of creeping discharge and air discharge from the contact part with the bush part 22 that contacts the bush part insertion hole 20b provided in the rear case 20 to the board pad part 29 or the conductor exposed part 19a. The discharge path J can be made 10 mm or longer by lengthening the bush part insertion hole 20b.

  Even if a plug connected to the tip of the cable 19 of the pad type earphone of Example 2 configured as described above is grounded and a voltage of +10 kV / −10 kV is applied to the outer surface of the earphone with an electrostatic surge tester, discharge is generated. Did not occur.

  Further, even when the earphone was attached to the human body and a voltage of +10 kV / −10 kV was applied to the plug with an electrostatic surge tester, no discharge pain was felt.

  The earphone of the present invention does not cause discomfort to the user because it does not discharge static electricity even when touched by a human body, and can be suitably used for audio equipment.

DESCRIPTION OF SYMBOLS 1 Front case, 1a Fitting part 2 Eartip 3 Dust-proof net 4 Silence sponge 5 Air hole 6 Speaker metal part (yoke)
7 Ear pad 8 Speaker metal part 9 Front case, 9a External insertion hole, 9b Center closed part, 9c Slit, 9d Space 9e Notch, 9f Fitting part 10 Sound path diaphragm part 10a Center hole 17 Rear case, 17a Neck shape part 17b Air hole, 17c Bush part insertion hole 17d Adhesion part, 17e Fitting part 19 Cable, 19a Conductor exposed part 20 Rear case, 20a Neck shape part, 20b Bush part insertion hole, 20c Fitting part 22 Bush part, 22a Cable passage hole, 22b Cable passage hole entrance 28 Resin holder 29 Substrate pad part A, B, C, D, E, F, G, H, I, J Discharge path a, b, c, d, e, f, g, h, i, j Discharge path component 101 Speaker 102 Cable 103 Front case, 103a Sound path hole,
104 Rear case, 104a Air hole, 104b Plating, 104c Fitting part 104d Cable insertion hole 231 Speaker 232 Partition plate 233 Mounted body (handset)
234 Semiconductor circuit 235 Vibrator 236 Front air chamber 237 Back air chamber 238 Front case 239 Sound hole 240 Sound hole 241 Sound hole

Claims (6)

In the canal type earphone with a speaker inside the case,
When the path of air discharge or creeping discharge formed between the external surface of the canal type earphone and the metal part of the speaker is a discharge path,
The length of the discharge path formed in the fitting portion between the front case and the rear case for housing the speaker;
The length of the discharge path formed in the fitting portion between the rear case and the bush holding the cord;
The length of the discharge path formed in the cable insertion hole in the bush;
The length of the discharge path from the air hole provided in the rear case to the metal part of the speaker,
Canal-type earphones designed to be at least 10 mm each. The canal type earphone according to claim 1, wherein the outer surface of the front case and the rear case is not plated. In the pad type earphone for fitting the front case and the rear case to form a speaker housing space for housing the speaker, and mounting the pad portion on the front case,
Forming a central blocking portion at the center of the front case;
Forming a plurality of external insertion holes around the central blocking portion;
A cylindrical rib provided with a notch extending in the direction of the speaker housing space from the periphery of the central blocking portion is erected,
The edge of the central part of the sound path diaphragm part interposed between the front case and the speaker is brought close to the surface of the central blocking part,
A pad-type earphone in which a discharge path formed by air discharge or creeping discharge formed between a metal portion and a pad portion of the speaker is 10 mm or more. When the path of air discharge or creeping discharge formed between the external surface of the pad-type earphone and the metal part of the speaker is a discharge path,
The length of the discharge path formed in the fitting part of the front case and the rear case for housing the speaker,
The length of the discharge path formed in the fitting portion between the rear case and the bush holding the cord;
The length of the discharge path formed in the cable insertion hole in the bush,
The pad type earphone according to claim 3, wherein each of the pad type earphones is 10 mm or more. In the pad type earphone with a speaker inside the case,
The pad-type earphone according to claim 4, wherein a slit is provided in a fitting portion between the front case and the rear case for housing the speaker, thereby forming an air hole between the inside of the case and the outside of the case. The pad type earphone according to any one of claims 3 to 5, wherein the outer surface of the front case and the rear case is not plated.

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