JP4436292B2 - Electronics - Google Patents

Description

  The present invention relates to an electronic device including a key operation unit and an electroacoustic transducer inside a casing.

Conventionally, in an electronic device, an electroacoustic transducer such as a microphone is electrically connected to the surface of a circuit board disposed inside the substrate, or electroacoustic conversion is performed at a position away from the key operation unit. There is something which arranged the vessel. Portable electronic devices such as mobile phones, PDAs (Personal Digital Assistants), digital cameras, digital video cameras, notebook personal computers, and the like are required to be small and thin. .
Japanese Utility Model Publication No. 4-61991

However, in the above-described conventional electronic device, since the electroacoustic transducer is arranged at a position away from the key operation unit, it is indispensable to reduce the size and thickness of the electroacoustic transducer when miniaturizing the electronic device. There was a problem that the improvement was difficult.
The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide an electronic device that can reduce the size of the electronic device without depending on the size and thickness of the electroacoustic transducer. It is said.

In order to solve the above problems, the present invention proposes the following means.
An electronic apparatus according to the present invention covers a circuit board, a substantially plate-like key operation unit, and the circuit board and the key operation unit in a casing, covering the surface of the circuit board. a support member for supporting the key operation unit with an electric-acoustic transducer, between said circuit board and said support member, and the electro-acoustic transducer mounted on the circuit board, is provided, wherein the housing The body includes an opening formed so as to communicate between the inside and the outside, and the electroacoustic transducer is provided with a sound hole at one end surface facing the support member, and at least a part of the sound hole and the sound hole The opening of the housing communicates with the support member, and the support member includes a substantially cylindrical communication member that divides a space including the opening and the sound hole from another space inside the housing. It is characterized by.
The electroacoustic transducer refers to a microphone unit that changes the sound that has reached from the outside into an electric signal, and a speaker unit that converts the electric signal into sound and emits the sound to the outside.

The communication member has one end in the longitudinal direction contacting the inner surface of the casing located around the opening, and the other end in the longitudinal direction located around the sound hole. It abuts on one end surface of the converter, the surface of the circuit board, or the surface of the support member.
Further, the communication member is formed integrally with the key operation unit.

  Further, the electroacoustic transducer is formed such that the support member is formed with a notch that is recessed in a direction substantially perpendicular to the direction overlapping the circuit board, and at least a part of the sound hole is exposed from the notch. It is characterized by arranging.

According to the present invention, since a part of the electroacoustic transducer and the key operation unit can be arranged in the thickness direction via the support member, the electroacoustic transducer can be reduced in size without reducing the size. The device can be easily downsized.
When the electroacoustic transducer is mounted on the circuit board, it can be mounted on the circuit board simultaneously with other electronic components that control various functions of the electronic device. The number of steps for incorporating the electroacoustic transducer can be reduced, and the manufacturing efficiency of the electronic device can be improved.

FIGS. 1 to 3 show an embodiment according to the present invention, and the embodiment described here is a case where the present invention is applied to a mobile phone.
As shown in FIG. 1, a mobile phone (electronic device) 1 according to this embodiment includes a first housing 2 and a second housing that can be overlapped in the thickness direction of the first housing 2. A body 3 and a hinge portion 5 that foldably connects the two casings 2 and 3 to each other are provided. In addition, the hinge part 5 is distribute | arranged so that each edge part 2a, 3a (henceforth base end part 2a, 3a) of the two housing | casing 2 and 3 may be connected.

  Inside the second housing 3, a display unit 7 having a display surface 7a for displaying various information on the surface, such as an LCD (Liquid Crystal Display), and a speaker unit 9 for calling are provided. The display surface 7a of the display unit 7 is exposed on the facing surface 3c side of the second housing 3 facing the first housing 2 in a state where the two housings 2 and 3 are overlapped with each other. The speaker unit 9 is disposed on the distal end portion 3b of the second housing 3 located on the opposite side to the base end portion 3a, and from the facing surface 3c of the second housing 3 to the second housing 3. It is exposed to the outside through an opening 3d that penetrates the internal space.

Inside the first housing 2, there are a key operation unit 11 including various pressable operation keys 10 such as a call key and a call end key, a call microphone unit (electroacoustic transducer) 13, and A built-in antenna unit 15 for communication is provided. Each operation key 10 of the key operation unit 11 is exposed to the outside from the facing surface 2c of the first housing 2 facing the second housing 3 in a state where the two housings 2 and 3 are overlapped with each other. is doing. The microphone unit 13 is disposed on the distal end portion 2b side of the first housing 2 located on the side opposite to the base end portion 2a, and from the facing surface 2c of the first housing 2 to the first housing 2. It is exposed to the outside through the opening 2d penetrating into the internal space.
The built-in antenna unit 15 is for performing wireless communication with the base station, and is arranged further to the distal end 2b side of the first housing 2 than the microphone unit 13 is.

The first housing 2 includes a front case 17 constituting the facing surface 2c side of the first housing 2 and a rear case 19 constituting the outer surface 2e side of the first housing 2. The front case 17 and the rear case 19 can be coupled to each other in the thickness direction of the first housing 2.
As shown in FIGS. 2 and 3, the first housing 2 has a circuit board 21 and a substantially plate-shaped shield case (supported) from the inner surface 19 a side of the rear case 19 located on the opposite side of the outer surface 2 e. Member) 23 and the key operation unit 11 described above are arranged in an overlapping manner. The microphone unit 13 described above is mounted on the surface 21 a of the circuit board 21 facing the shield case 23 together with other electronic components that control various functions of the mobile phone.
The microphone unit 13 converts sound that reaches the sound hole 13b from the outside of the first housing 2 into an electric signal, and the sound hole 13b is formed in a substantially circular shape. Moreover, the area of the sound hole 13b is formed smaller than the area of the one end surface 13a of the microphone part 13.

The shield case 23 is disposed between the circuit board 21 and the key operation unit 11 so as to cover the surface 21 a of the circuit board 21 and support the key operation unit 11. The shield case 23 has conductivity and is configured to be electrically connected to a ground pattern (not shown) of the circuit board 21.
Further, the end of the shield case 23 located on the front end 2b side of the first housing 2 is substantially perpendicular to the surface 23a direction (the direction in which the shield case 23 and the circuit board 21 overlap (thickness direction)). A substantially concave cutout 25 that is recessed in the direction is formed. The sound hole 13b formed in the one end surface 13a of the microphone part 13 facing the shield case 23 is arranged so as to overlap the notch part 25 in the thickness direction. That is, the microphone part 13 has the sound hole 13b notched. It is arranged between the shield case 23 and the circuit board 21 so as to overlap the thickness direction of the portion 25 and the shield case 23, and at least a part of the sound hole 13 b is exposed from the notch 25. The The other part of the microphone part 13 excluding the part where the sound hole 13b is formed is disposed between the circuit board 21 and the shield case 23 so as to overlap the shield case 23 in the direction in which the circuit board 21 and the shield case 23 overlap. As a result, the shield case 23 is covered.

The key operation unit 11 includes the plurality of operation keys 10 described above and a rubber sheet 27 having a substantially rectangular plate shape that can be elastically deformed. The rubber sheet 27 is made of a resin material that can be elastically deformed in the thickness direction.
The plurality of operation keys 10 are arranged on the surface 27a of the rubber sheet 27 and are exposed to the outside from a plurality of through holes 17b penetrating in the thickness direction of the front case 17.
The key operation unit 11 includes a thin film switch sheet (not shown) disposed on the back surface 27 b side of the rubber sheet 27, and when the operation key 10 is pressed toward the front surface 23 a of the shield case 23. The rubber sheet 27 is elastically deformed and comes into contact with the switch pattern formed on the surface of the switch sheet. This switch pattern is electrically connected to the circuit board 21 described above.

A substantially cylindrical rib (communication member) 29 having a through-hole 29a extending in the thickness direction of the rubber sheet 27 is integrally formed at the end of the rubber sheet 27 located on the front end 2b side of the first housing 2. Is formed. That is, the rib 29 is also formed so as to be elastically deformable. The rib 29 is inserted into the cutout portion 25 of the shield case 23, and one end in the longitudinal direction of the rib 29 contacts the inner surface 17 a of the front case 17 positioned around the opening 2 d of the first housing 2. It touches. The other end of the rib 29 in the longitudinal direction is in contact with one end surface 13a of the microphone portion 13 located around the sound hole 13b. That is, the rib 29 is sandwiched between the front case 17 and the microphone portion 13 and is pressed against the inner surface 17 a of the front case 17 and the one end surface 13 a of the microphone portion 13 by the elastic force of the rib 29.
As a result, the space including the opening 2d of the first housing 2 and the sound hole 13b of the microphone portion 13 and the other space inside the first housing 2 are partitioned from each other. The sound hole 13 b of the microphone unit 13 communicates with the outside of the first housing 2 through the through hole 29 a of the rib 29 and the opening 2 d of the first housing 2.

In the cellular phone 1 configured as described above, when the microphone unit 13 is incorporated into the first housing 2, first, the microphone unit 13 and other electronic components are mounted on the surface 21 a of the circuit board 21. . In this case, since the microphone unit 13 can be attached to the circuit board 21 in the same manner as other electronic components, the microphone unit 13 and other electronic components can be mounted simultaneously.
Next, the circuit board 21, the shield case 23, and the key operation unit 11 are sequentially stacked from the inner surface 19 a side of the rear case 19. Finally, the front case 17 is coupled to the rear case 19 so that the key operation unit 11 is pressed against the shield case 23, whereby the assembling work of the microphone unit 13 is completed. In this state, since the rib 29 is sandwiched between the inner surface 17a of the first housing 2 and the one end surface 13a of the microphone unit 13, the rib 29 is elastically deformed.

  As described above, according to the mobile phone 1, a part of the microphone unit 13 is covered with the shield case 23, whereby a part of the microphone unit 13 and the key operation unit 11 are connected via the shield case 23. They can be arranged in the thickness direction. In particular, since the key operation unit 11 is supported by the shield case 23, the microphone unit 13 and the operation key 10 that can be pressed down can be arranged in the thickness direction. Accordingly, it is possible to reduce the size of the mobile phone 1 without reducing the size of the microphone unit 13.

In particular, by forming the cutout portion 25 of the shield case 23, the operation keys 10 of the key operation unit 11 are arranged so as to overlap the surface 23a of the shield case 23 located around the cutout portion 25 and the sound hole 13b. Therefore, the mobile phone 1 can be easily downsized.
In addition, since part of the microphone unit 13 and the key operation unit 11 can be arranged in the thickness direction through the shield case 23, the first casing 2 can be arranged without increasing the size. The built-in antenna unit 15 and the microphone unit 13 arranged at the front end 2b of the housing 2 can be arranged apart from each other. Therefore, it is possible to reliably prevent the microphone unit 13 from adversely affecting the antenna characteristics of the built-in antenna unit 15.

Furthermore, since the microphone unit 13 can be mounted on the surface 21a of the circuit board 21 simultaneously with other electronic components, the number of steps for assembling the microphone unit 13 into the first housing 2 is reduced, and the cellular phone 1 is reduced. The production efficiency can be improved. Further, since the microphone unit 13 is fixed to the circuit board 21, it is not necessary to separately form positioning ribs or the like in the first casing 2, the shield case 23, the key operation unit 11, and the like. Manufacturing costs can also be reduced.
In addition, the substantially cylindrical rib 29 having the through hole 29a allows the space between the sound hole 13b of the microphone portion 13 and the opening 2d of the first housing 2 and the other inside of the first housing 2 to be Since the space is partitioned from each other, the sound that enters the first housing 2 from the outside of the first housing 2 through the opening 2d can efficiently reach the sound hole 13b. That is, since sound does not escape to other spaces inside the first housing 2, the sound collection performance of the microphone unit 13 can be improved.

Furthermore, since the rib 29 is formed so as to be elastically deformable, the space between the sound hole 13b and the opening 2d is surely sealed with respect to other spaces inside the first housing 2 by the elastic force. be able to. Further, by bringing the other end of the rib 29 into contact with the one end surface 13a located around the sound hole 13b, the space between the sound hole 13b and the opening 2d can be minimized. Therefore, the sound collecting performance of the microphone unit 13 can be further improved.
Further, as described above, the space between the sound hole 13b and the opening 2d and the other space inside the first housing 2 are partitioned, so that the dust can be collected in the other space via the opening 2d. Can easily be prevented from entering.
Further, since the rib 29 is formed integrally with the rubber sheet 27, the positioning of the rib 29 is simultaneously performed only by positioning the key operation portion 11 with respect to the first casing 2, the circuit board 21, and the shield case 23. Therefore, the rib 29 can be easily incorporated into the first housing 2.

In the above-described embodiment, the rib 29 is arranged so that the other end is in contact with the one end surface 13a of the microphone unit 13. However, the present invention is not limited to this, and at least the first casing 2 has the rib 29. The opening 2d and the sound hole 13b of the microphone 13 are communicated with each other so that a space including the opening 2d and the sound hole 13b is separated from other spaces inside the first housing 2. Just do it. That is, for example, as shown in FIG. 4, the other end of the substantially cylindrical rib (communication member) 41 having the through hole 41 a is brought into contact with the surfaces 21 a and 23 a of the circuit board 21 and the shield case 23. You may make it partition the space containing the part 2d and the sound hole 13b with the other space inside the 1st housing | casing 2. FIG.
In the case of this configuration, the space including the opening 2d and the sound hole 13b is made the other inside the first housing 2 without causing the other end of the rib 41 to contact the microphone 13 as in the above embodiment. Therefore, it is possible to prevent the microphone part 13 from generating stress, that is, the microphone part 13 can be protected.

In addition, the sound hole 13b of the microphone unit 13 is communicated to the outside of the first casing 2 as a whole, but is not limited thereto, and at least a part of the sound hole 13b is the first hole. It only needs to communicate to the outside of the housing 2. That is, for example, a part of the sound hole 13b may be covered with the shield case 23 or the ribs 29 and 41.
Furthermore, although the substantially cylindrical ribs 29 and 41 are formed integrally with the rubber sheet 27, the present invention is not limited to this. For example, the substantially cylindrical ribs 29 and 41 may be configured by separate members or the first housing. It may be formed integrally with the body 2.

In addition, the microphone unit 13 is mounted on the surface 21 a of the circuit board 21, but the present invention is not limited to this, and at least a part of the sound hole 13 b communicates to the outside of the first housing 2. As long as it is provided between the circuit board 21 and the shield case 23. That is, the microphone unit 13 may be fixed to the shield case 23 so as to face the surface 21a of the circuit board 21, for example.
In addition, although the microphone part 13 was set as the structure arrange | positioned so that the sound hole 13b might be exposed from the notch part 25 formed in the shield case 23, without forming the notch part 25 in the shield case 23, a microphone part At least a part of the 13 sound holes 13 b is exposed so as to communicate with the opening 2 d of the housing 2, and at least a part of the microphone part 13 overlaps the shield case 23 in the direction in which the circuit board 21 and the shield case 23 overlap. Thus, it may be arranged between the circuit board 21 and the shield case 23.

Further, the microphone unit 13 is arranged between the circuit board 21 and the shield case 23. However, the present invention is not limited to this. For example, an electric signal is converted into sound, and the sound is converted into the sound hole 13b. You may arrange | position the speaker part discharged | emitted from the outside.
In addition, although the cellular phones 1 and 51 including the two casings 2 and 3 connected to each other by the hinge portion 5 have been described, the present invention is not limited to this. For example, the cellular phone is configured by a single casing. It doesn't matter.

Furthermore, the present invention is not limited to a mobile phone, and may be applied to, for example, a PDA, a digital camera, a digital video camera, or a notebook personal computer.
As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

It is a schematic perspective view which shows the state which opened the 1st, 2nd housing | casing of the mobile telephone which concerns on one Embodiment of this invention mutually. FIG. 2 is an exploded perspective view showing a key operation unit, a shield case, and a circuit board arranged inside a first housing in the mobile phone of FIG. 1. The enlarged perspective view which shows a mode that a part of 1st housing | casing was fractured | ruptured in the mobile telephone of FIG. FIG. 3 is an enlarged perspective view showing a state in which a part of the first housing is broken in the mobile phone according to the embodiment of the present invention.

Explanation of symbols

1 Mobile phone (electronic equipment)
2 1st housing | casing 2d Opening part 11 Key operation part 13 Microphone part (electroacoustic transducer)
13a one end surface 13b sound hole 17a inner surface 21 circuit board 21a surface 23 shield case (supporting member)
23a Surface 25 Notch 29, 41 Rib (communication member)

Claims (4)

A circuit board, a substantially plate-like key operation part, and a circuit board and the key operation part are arranged inside the housing to cover the surface of the circuit board and support the key operation part. A support member, an electroacoustic transducer, and an electroacoustic transducer mounted on the circuit board between the circuit board and the support member ;
The housing includes an opening formed so as to communicate between the inside and the outside,
The electroacoustic transducer is provided with a sound hole on one end surface facing the support member,
At least a part of the sound hole communicates with the opening of the housing,
The electronic device according to claim 1, wherein the support member includes a substantially cylindrical communication member that divides a space including the opening and the sound hole from another space inside the housing . The electro-acoustic transducer has one end in the longitudinal direction contacting the inner surface of the housing located around the opening, and the other end in the longitudinal direction located around the sound hole. 2. The electronic device according to claim 1 , wherein the electronic device is in contact with any one end surface of the substrate, the surface of the circuit board, or the surface of the support member. The electronic device according to claim 2 , wherein the communication member is formed integrally with the key operation unit. The support member is formed with a notch that is recessed in a direction substantially perpendicular to the direction overlapping the circuit board,
The electro-acoustic transducer, an electronic apparatus according to claims 1 in any one of the 3, wherein at least a portion of the sound hole is disposed so as to be exposed from the notch.

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