JPH04128449U - telephone receiver - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a telephone receiver with improved electrostatic withstand voltage by lengthening the electrostatic discharge path and covering parts that are susceptible to electrostatic discharge with plastic. [Structure] In a receiver equipped with a diaphragm 14 that vibrates together with the voice coil when the voice coil is energized, a static electricity jump prevention plate 13 having an opening in the center is placed above the diaphragm 14 with a slight gap in between. . Also,
A metal cover 12 for preventing DC magnetic flux covered with plastic is provided on the outside of the static electricity jump prevention plate 13.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a telephone receiver with an improved structure capable of improving electrostatic withstand voltage.

0002

[Conventional technology]

Figure 2 shows a hearing aid compatible telephone receiver. The receiver has a magnetic circuit consisting of a circular permanent magnet 2 and a plate 3 around a yoke 1. A frame assembly 4 is provided on the outer periphery of this magnetic circuit. And this A diaphragm 5 is attached to the periphery of the frame assembly 4 so as to be able to vibrate.

0003 A voice coil 6 is integrally connected to the center of the diaphragm 5 and is connected to the yoke 1. It is inserted into the gap between the plate 3 and the magnetic circuit and the diaphragm 5. The upper part of is covered with a unit cover 7. Note that reference numeral 8 designates a hearing aid coil provided near the diaphragm 5.

0004

[Problem that the idea aims to solve]

By the way, conventionally, for example, when using a telephone in a dry area with low humidity, Static electricity charged on the user may discharge onto the metal parts of the handset inside the handset. , there was a risk that the electronic circuit built into the phone would be destroyed, making it impossible to make calls.

[0005] That is, in FIG. 2 described above, for example, if the unit cover 7 is made of resin, the static Electricity flows into the handset through the opening of the unit cover 7, and flows through the lines A→B→C in the same figure. Hearing aid coil 8 is reached at the top. Also, if the unit cover 7 is metal, If so, the discharge will reach the hearing aid coil 8 via route A'→C, which has the shortest discharge path. Ru.

[0006] Furthermore, in the case of a normal telephone, when the handset 9 is brought close to the ear as shown in Figure 3, etc. It is known that an electric discharge occurs, and the shock caused by the electric discharge causes great discomfort.

[0007] This invention was devised to solve this problem, and its purpose is However, it is necessary to lengthen the discharge path of static electricity, and to replace parts that are easily discharged with plastic. It is an object of the present invention to provide a telephone receiver whose electrostatic withstand voltage can be improved by covering it with a.

[0008]

[Means to solve the problem]

In order to achieve the above object, the present invention provides voice control by energizing the voice coil. In a handset equipped with a diaphragm that vibrates with the diaphragm, there is a slight Features a static electricity jump prevention plate with an opening in the center across a gap. In addition, by covering the metal cover for preventing DC magnetic flux with plastic, static It is possible to reduce the leakage magnetic flux from the magnet without reducing the withstand voltage. It is characterized by

[0009]

[Effect]

With the above configuration, according to the present invention, a static electricity jump prevention plate is placed above the diaphragm. As shown in Figure 1, the discharge path of static electricity charged on the human body is From the opening of the front cover 11 of the body to the center opening 13 of the static electricity jump prevention plate 13 The route to reach the hearing aid coil 15 is to move on the back side of the coil through a. (A→B→C→D→E→F in Figure 1).

0010 In other words, according to the present invention, the discharge path becomes significantly longer than the conventional one. This makes it difficult for discharge to occur and also weakens the discharge voltage, so the internal electronic Electrostatic damage to circuit elements is prevented. In addition, the metal cover 12 is covered with plastic. This prevents the discharge path from becoming short.

[0011]

【Example】

Hereinafter, preferred embodiments of the present invention will be described based on the drawings. FIG. 1 shows an embodiment in which the present invention is applied to a hearing aid type telephone receiver. In the same figure, a static electricity jump prevention plate 1 is placed above the diaphragm 14 with a slight gap in between. 3 is arranged, and a hearing aid coil 15 is provided inside this and on the outer peripheral side. It is being In the embodiment, the static electricity jump prevention plate 13 is made of synthetic material such as ABS resin. It is made of fat and has a circular opening 13a formed in the center. And outside of that A metal cover 12 covered with plastic is provided on the side, and this metal cover 1 2 is integrated with the front cover 11. In addition, the structure of the magnetic circuit, etc. As is well known.

0012 Next, the operation of this embodiment will be explained. In Figure 1, the static electricity charged on the human body, etc. (point A) outside the handset is as follows: A→B→C → Discharge along the path of D → E → F. In other words, the static electricity at point A is From the opening (point B) formed on the front surface of 11 to the center opening of static electricity jump prevention plate 13 Pass through part 13a (point C, point D), then move on the back side and reach the outer periphery (point E). , from here the hearing aid coil 15 (point F) is reached. And finally reaches an internal electronic circuit element (not shown) from this hearing aid coil 15. .

[0013] Also, if the metal cover 12 is not covered with plastic, The path becomes A→G→G'→H→I. In other words, the static electricity at point A is removed by the metal cover. Jump into the G point of 12, move inside the metal cover 12 to the G' point, and connect the external terminal from here. Reach Null 16.

[0014] As is clear from the above, due to the presence of the static electricity jump prevention plate 13, the discharge history of static electricity is It can be seen that the route is significantly longer than the route shown in Figure 2 described above. Also By covering the metal cover 12 with plastic, the discharge path is shortened. It is now possible to prevent direct current magnetic flux leakage (magnet leakage magnetic flux). This also makes it possible to create a handset with high electrostatic withstand voltage. According to this embodiment, It was confirmed that the receiver's withstand voltage was over 20KV.

[0015] In the above embodiment, the present invention is applied to a hearing aid type telephone receiver. As mentioned above, for example, in a standard type handset, the hearing aid coil is This will cause discharge to the voice coil lead wire hidden below the Of course, the same effect can be obtained even if the present invention is applied to this type of handset. be.

[0016]

[Effect of the idea]

As explained above, this idea works by energizing the voice coil. In a handset equipped with a diaphragm 14 that vibrates at By arranging the static electricity jump prevention plate 13 having an opening in the center across a gap, This makes it possible to lengthen the discharge path for static electricity, thereby improving the static electricity withstand voltage. can be achieved.

[0017] Furthermore, by covering the metal cover 12 with plastic, the discharge path can be shortened. This makes it possible to prevent electrostatic discharge from occurring even in DC magnetic flux leakage prevention handsets. This allows for high-pressure handsets.

[Brief explanation of drawings]

FIG. 1 shows an embodiment in which the present invention is applied to a hearing aid type telephone receiver.

FIG. 2 is a sectional front view of a conventional hearing aid type telephone receiver.

FIG. 3 is a diagram showing a state when static electricity is discharged between a human body and a telephone handset.

[Explanation of symbols]

11 Front cover 12 Metal cover 13 Static electricity jump prevention plate 13a opening 14 Vibration plate 15 Hearing aid coil

Claims (2)

[Scope of utility model registration request] Claim 1: A telephone receiver equipped with a diaphragm 14 that vibrates together with the voice coil when the voice coil is energized,
A telephone receiver characterized in that a static electricity jump prevention plate 13 having an opening in the center is arranged above the diaphragm 14 with a slight gap in between. 2. The handset according to claim 1, wherein a metal cover 12 for preventing DC magnetic flux covered with plastic is provided on the outside of the plate 13 for preventing static electricity from entering.