JP2007096843A - Mobile terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile terminal device which can increase the volume of a back cavity of an acoustic converter and the hermeticity of the same, and can be improved in sound quality without structural restrictions along with the reduction in size and thickness of the overall device. <P>SOLUTION: A holding member 13 is for holding a speaker 4, and it comprises a holder 13a for holding the speaker 4, an extended portion 13b which is extended in the outer peripheral direction of the speaker 4 from the opening 2-side end of the holder 13a and is abutted against the internal surface of a housing 1, and a rib 13c which is extended from the edge of the extended portion 13b and is abutted against a circuit board 3. The holding member 13 is so arranged as to seal the back cavity 12 as a back face-side space of the speaker 4 which is formed between the holding member 13 and the circuit board 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mobile terminal device such as a mobile phone, and more particularly to a mobile terminal device capable of improving sound quality during reproduction of music or the like.

  In general, a portable terminal device such as a mobile phone has a built-in speaker as an acoustic transducer inside the housing, and from the speaker, a ring tone for a telephone or mail is emitted during standby, or a voice is output during a call. It has come to be.

  FIG. 8 shows an example of a conventional portable terminal device. An opening 2 that communicates the outside with the inside is formed at a required surface of the housing 1, and the opening 2 of the housing 1 is provided. A circuit board 3 is disposed inside the casing 1 so as to face and parallel to the surface to be formed, and from the opening 2 to the inside of the casing 1 between the circuit board 3 and the opening 2. A speaker 4 for inputting and outputting audio is arranged via a holder member 5.

  The holder member 5 is formed in a substantially ring shape with an arrangement hole 6 provided in the center thereof, and a fitting groove 7 is provided in the inner peripheral portion thereof, so that the front side holding portion that holds the front side peripheral portion of the speaker 4 is provided. 8 and a rear side holding portion 9 that holds the rear peripheral edge portion of the speaker 4, the surface of the front side holding portion 8 is brought into close contact with the inner surface of the housing 1, and the rear side holding portion 9 The board-side mounting portion 10 that is continuously provided is brought into close contact with the surface of the circuit board 3, thereby holding the outer peripheral portion of the speaker 4.

For example, Patent Document 1 shows a general technical level related to the mobile terminal device having the structure shown in FIG.
Japanese Patent Laid-Open No. 10-42383

  By the way, in the case of a conventional portable terminal device, it was sufficient if it had only a function capable of ringing a ringtone, so the sound quality was not considered so important, and it was valid even if the sound was somewhat broken However, in recent mobile terminal devices, specifications for listening to music such as “Ringtone (registered trademark)” and “Chaku-Uta (registered trademark)” are required, and how loud and high-quality sound is. How to improve it is a very important point in the development.

  Here, in order to improve the sound quality, the size and the sealing degree of the front cavity 11 as the front side space of the speaker 4 are secured, and the size and the sealing degree of the back cavity 12 as the back side space of the speaker 4 are secured. There is a need to.

  However, in the conventional portable terminal device as shown in FIG. 8, the front cavity 11 on the front side of the speaker 4 is made larger due to the structural restrictions accompanying the overall downsizing and thinning that have recently been increasing in demand. In addition to mounting many electronic components (not shown) on the surface of the circuit board 3 facing the inner surface of the housing 1, the holder member 5 is a speaker. Since the back side holding part 9 for holding the back side of 4 and the substrate side mounting part 10 are connected in series, the back cavity 12 cannot be enlarged and it is difficult to improve sound quality. .

  In view of such circumstances, the present invention can increase the volume of the back cavity of the acoustic transducer and improve the sealing performance without being restricted by the structure due to the overall downsizing and thinning, thereby improving the sound quality. An object of the present invention is to provide a portable terminal device that can be realized.

The present invention includes a housing having an opening that communicates the outside with the inside;
A circuit board disposed inside the casing so as to face a surface on which the opening of the casing is provided;
An acoustic transducer that is disposed inside the housing between the circuit board and the opening and that inputs and outputs audio through the opening;
In a portable terminal device comprising a holding member that holds the acoustic transducer,
The holding member is
Holding the side portion of the acoustic transducer, and a holding portion disposed with a gap between the circuit board;
An extending portion that extends from the opening-side end of the holding portion in the outer peripheral direction of the acoustic transducer and contacts the inner surface of the housing;
The acoustic transducer that includes a rib portion that extends from a peripheral edge of the extending portion toward the circuit board and whose end is in contact with the circuit board, and is formed between the circuit board and the acoustic transducer. The present invention relates to a portable terminal device that is configured to seal a rear side space of the portable terminal device.

  In addition, the holding unit is configured to hold the acoustic transducer so that a front-side space is formed between the acoustic transducer and an inner surface of the housing in which the opening is provided, thereby increasing the volume. Effective in planning.

  In addition, the acoustic transducer is effective in simplifying the electrical wiring structure by having an electrical connection member electrically connected to the circuit board between the circuit board and the circuit board.

  Further, the acoustic transducer is configured to be biased toward the inner surface of the housing by a biasing member provided between the circuit board and the holding portion, the extending portion, and the inner surface of the housing. It is effective in ensuring contact and improving the degree of sealing of the front side space or the back side space.

  Further, the holding member is made of a material having self-adhesiveness, so that the contact between the holding member, the inner surface of the housing and the circuit board is further ensured, and the front side space and the rear side space are sealed. It is effective in improving the degree.

The circuit board has an electronic component mounted on a surface facing the inner surface of the housing.
The holding member is arranged so as to house the electronic component in the back side space, thereby increasing the degree of freedom in arranging the holding member and increasing the volume of the back side space to improve sound quality. Effective in planning.

  Further, the holding member has a portion where the rib portion abuts on the circuit board and a portion abuts on the electronic component, and is formed to have a step shape along the abutting electronic component. This is effective in improving the sound quality by further improving the degree of freedom of arrangement of the holding members and increasing the volume of the back side space.

  According to the portable terminal device of the present invention, the volume of the back cavity of the acoustic transducer can be increased and the sealing performance can be enhanced without being restricted by the structure due to the overall downsizing and thinning, thereby improving the sound quality. An excellent effect can be achieved.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  The embodiment described here is a case where the present invention is applied to a mobile phone as a mobile terminal device.

  As shown in FIG. 1, a mobile phone 20 according to this embodiment includes a first casing 1 and a second casing 1 ′ that can be overlapped in the thickness direction of the first casing 1. A hinge portion 21 is provided for connecting the two casings 1 and 1 'so that they can be folded together. In addition, the said hinge part 21 is distribute | arranged so that each base end part 1a, 1a 'of two housing | casing 1,1' may be connected.

  Various pressures can be applied to the surface of the first casing 1 (the surface of the first casing 1 facing the second casing 1 ′ when the two casings 1 and 1 ′ are folded). A key operation unit 23 including an operation key 22 and a microphone unit 24 for calling are provided. On the inside of the first casing 1, various controls are performed in accordance with the operation of the operation key 22 and the like. A circuit board 3 (shown in FIGS. 2 to 6) constituting the means is provided, and a speaker (not shown) is disposed on the back surface of the first casing 1. A speaker mounting structure is taken as an example.

  In addition, on the surface of the second casing 1 ′ (the surface of the second casing 1 ′ facing the first casing 1 when the two casings 1 and 1 ′ are folded), various information Is provided with a display unit 25 such as an LCD (Liquid Crystal Display) and a speaker unit 26 for receiving a call.

  FIG. 2 is a first example of an embodiment for carrying out the present invention. In the figure, the portions denoted by the same reference numerals as those in FIG. 8 represent the same thing, and are formed of a rubber-based material having elasticity. The holding member 13 having the holding portion 13a, the extending portion 13b, and the rib portion 13c and holding the speaker 4 and the back cavity 12 as a back side space of the speaker 4 formed between the circuit board 3 and the holding member 13 are provided. It is arranged so as to be sealed.

  The holding portion 13 a is disposed at a substantially central portion of the holding member 13 with a gap between the holding portion 13 and the circuit board 3, holds the side portion of the speaker 4, and the speaker 4 and the opening 2 are provided. A front cavity 11 as a front side space is formed between the inner surface of the casing 1 to be formed.

  The extending portion 13b extends from the end of the holding portion 13a on the opening 2 side in the outer peripheral direction of the speaker 4 and is in contact with the inner surface of the housing 1.

  The rib portion 13c extends from the peripheral edge of the extended portion 13b to the circuit board 3 side, and an end thereof is in contact with the circuit board 3.

  On the other hand, the speaker 4 has an electrical connection member 14 electrically connected to the circuit board 3 between the speaker board 4 and the electrical connection member 14 as a spring terminal (elastic member as shown in FIG. 2). The speaker 4 is urged toward the inner surface of the housing 1 by the urging means. Instead of configuring the electrical connecting member 14 with a spring terminal, a wire with a connector is used, the connector is connected to the circuit board 3 to electrically connect the speaker 4 and the circuit board 3, and the connector is attached. An urging member such as an elastic member may be provided in addition to the electrical connection member 14 as the wire, and the speaker 4 may be urged toward the inner surface of the housing 1 by the urging member.

  Various electronic components 15 are mounted on the surface of the circuit board 3 facing the inner surface of the housing 1, and the holding member 13 is disposed so as to accommodate the electronic components 15 in the back cavity 12. It is.

  Next, the operation of the illustrated example will be described.

  By providing the holding member 13 with the extending portion 13b and the rib portion 13c that contacts the circuit board 3, it is possible to increase the volume of the speaker 4 with the back cavity 12 sealed, Sound quality can be improved.

  Since the holding portion 13a holds the speaker 4 so that the front cavity 11 is formed between the speaker 4 and the inner surface of the housing 1 where the opening 2 is provided, the volume can be increased. Become.

  Since the speaker 4 includes an electrical connection member 14 that is electrically connected to the circuit board 3 between the speaker 4 and the circuit board 3, it is possible to simplify the electrical wiring structure, and the electrical connection. Since the member 14 is configured by a spring terminal which is an urging member such as an elastic member, the speaker 4 is urged toward the inner surface side of the housing 1, so that the holding portion 13 a and the extending portion 13 b are connected to the housing. The contact with the inner surface of the body 1 can be ensured, and the degree of sealing of the front cavity 11 can be improved.

  An electronic component 15 is mounted on the surface of the circuit board 3 facing the inner surface of the housing 1, and the holding member 13 is mounted in the back cavity 12 on the electronic component 15 on the circuit board 3. Therefore, it is possible to increase the degree of freedom of arrangement of the holding member 13 and increase the volume of the back cavity 12 to improve sound quality.

  Incidentally, when the holding member 13 is formed of a rubber-based material having elasticity, if the thickness t of the extending portion 13b of the holding member 13 is about 1 [mm], the holding portion 13a and the extending portion are formed. 13b becomes a form firmly stuck to the inner surface of the housing 1 without bending.

  Further, the thickness T of the rib portion 13c of the holding member 13 can be brought into close contact with the surface of the circuit board 3 by setting it to about 2 [mm].

  In this manner, the volume of the back cavity 12 of the speaker 4 can be increased and the sealing performance can be improved without being restricted by the structure accompanying the overall reduction in size and thickness, and sound quality can be improved.

  FIG. 3 shows a second example of an embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 2 denote the same components, and the basic configuration is the same as that shown in FIG. However, as shown in FIG. 3, the present embodiment is characterized in that the flange portion 13d is formed by increasing the width W of the portion of the rib portion 13c that contacts the circuit board 3, and the flange portion 13d. In that the rib 16 is extended from the inner surface of the housing 1 so as to be sandwiched with the circuit board 3.

  As described above, the flange portion 13d is formed by increasing the width of the portion of the rib portion 13c that contacts the circuit board 3, and the rib 16 that holds the flange portion 13d so as to be sandwiched between the circuit board 3 and the rib 16 is provided. When extending from the housing 1, the flange portion 13 d is securely attached to the surface of the circuit board 3, and the sealing degree of the back cavity 12 of the speaker 4 is further improved even if the rib portion 13 c of the holding member 13 is thin. It becomes possible to make it.

  Incidentally, in the case of the holding member 13 formed of an elastic rubber-based material, the width W of the flange portion 13d of the rib portion 13c may be about 5 [mm].

  FIG. 4 is a third example of an embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 2 denote the same components, and the basic configuration is the same as that shown in FIG. However, the feature of this illustrated example is that the holding member 13 is made of a self-adhesive material such as styrene polymer or styrene elastomer as shown in FIG. In addition, ribs 17 corresponding to the outer shape of the holding member 13 are provided on the inner surface of the housing 1 so as to facilitate positioning of the holding member 13.

  The styrenic polymer or styrenic elastomer is a material having high elasticity and tensile strength over a wide temperature range and having self-adhesiveness, and has high flexibility with respect to removal from the mold during molding. It is easy to form and has a high degree of molding freedom.

  As described above, when the holding member 13 is formed of a self-adhesive material such as a styrene polymer or a styrene elastomer, the holding portion 13a and the extending portion 13b of the holding member 13 are firmly attached to the inner surface of the housing 1. Therefore, the thickness t of the extending portion 13b can be reduced to about 0.5 [mm].

  Further, the thickness T of the rib portion 13c of the holding member 13 can be brought into close contact with the surface of the circuit board 3 even when the thickness T is about 1 to 1.5 [mm].

  As a result, the contact between the holding member 13 and the inner surface of the housing 1 and the circuit board 3 can be further ensured, and the degree of sealing of the front cavity 11 and the back cavity 12 of the speaker 4 can be further improved.

  2, 3, and 4, an example in which the rib portion 13 c is closely attached to the circuit board 3 so as to surround the outer periphery so as not to interfere with the electronic component 15 mounted on the surface of the circuit board 3. However, as shown in FIG. 5, without avoiding the electronic component 15, the rib portion 13 c of the holding member 13 has a portion that contacts the circuit board 3 and a portion that contacts the electronic component 15. May be. The flat cross-sectional shape of the rib portion 13c of the holding member 13 does not necessarily have to be a square, and can be set freely according to the arrangement of the electronic component 15. In FIG. 5, reference numeral 18 denotes a speaker pattern as a contact point formed on the circuit board 3, and when the electrical connecting member 14 is constituted by a spring terminal which is an urging member such as an elastic member, the spring The terminal is in contact with the speaker pattern 18.

  Here, for example, as shown in FIG. 6A, the rib portion 13 c is formed from the top to the outside of the electronic component 15 at a location where the rib portion 13 c collides with the electronic component 15, as in the VIa-VIa cross section of FIG. 5. By inflating it so as to have a stepped shape and covering the electronic component 15, it can be brought into close contact with the circuit board 3.

  Further, when there is a large electronic component 15 such as the VIb-VIb cross section and the VIc-VIc cross section in FIG. 5, as shown in FIGS. 6 (b) and 6 (c), The rib portion 13c can be brought into close contact with the upper surface as it is. As in the case shown in FIG. 6A, if there is a space for expanding the rib portion 13 c from the top to the outside of the electronic component 15, that may be used.

  Furthermore, when the electronic parts 15 are densely packed as in the VII part of FIG. 5, the thickness of the rib part 13c is increased so as to cover the plurality of electronic parts 15 as shown in FIG. It is also possible to form a concave portion 19 as a step shape matching the shape of each electronic component 15 and make it closely contact. Even if the rib portion 13c of the holding member 13 is pressed against the electronic component 15, the styrene polymer or the styrene elastomer has high elasticity, so there is no fear of damaging the electronic component 15.

  That is, as described above, the rib portion 13c of the holding member 13 has a portion that contacts the circuit board 3 and a portion that contacts the electronic component 15, and has a step shape along the contacting electronic component 15. This is effective in improving the degree of freedom of arrangement of the holding member 13 and improving the sound quality by increasing the volume of the back cavity 12, while being added to the electronic component 15 when the mobile terminal device is dropped. The impact can be absorbed by the holding member 13 and the electronic component 15 can be prevented from being damaged.

  In addition, the portable terminal device of the present invention is not limited to the above-described illustrated examples, and various modifications can be made without departing from the scope of the present invention. Needless to say, the present invention can be applied to portable terminal devices other than cellular phones.

It is a perspective view which shows an example of the mobile telephone to which this invention is applied. It is a sectional side view of the 1st example of the form which carries out the present invention. It is a sectional side view of the 2nd example of the form which carries out the present invention. It is a sectional side view of the 3rd example of the form which carries out the present invention. It is a perspective view which shows the contact surface with respect to the circuit board of the holding member in each example of embodiment which implements this invention. 5A is a cross-sectional view taken along the line VIa-VIa in FIG. 5, FIG. 5B is a cross-sectional view taken along the line VIb-VIb in FIG. 5, and FIG. FIG. 7 is a perspective view showing a step shape of a holding member along an electronic component arranged on a circuit board, and is a view corresponding to a VII portion in FIG. 5. It is a sectional side view which shows an example of the conventional portable terminal device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2 Opening part 3 Circuit board 4 Speaker (acoustic transducer)
11 Front cavity (front side space)
12 Back cavity (back side space)
13 holding member 13a holding portion 13b extending portion 13c rib portion 14 electrical connecting member (biasing member)
15 Electronic Components 20 Mobile Phone (Mobile Terminal Equipment)

Claims (7)

A housing having an opening communicating with the outside and the inside;
A circuit board disposed inside the casing so as to face a surface on which the opening of the casing is provided;
An acoustic transducer that is disposed inside the housing between the circuit board and the opening and that inputs and outputs audio through the opening;
In a portable terminal device comprising a holding member that holds the acoustic transducer,
The holding member is
Holding the side portion of the acoustic transducer, and a holding portion disposed with a gap between the circuit board;
An extending portion that extends from the opening-side end of the holding portion in the outer peripheral direction of the acoustic transducer and contacts the inner surface of the housing;
The acoustic transducer that includes a rib portion that extends from a peripheral edge of the extending portion toward the circuit board and whose end is in contact with the circuit board, and is formed between the circuit board and the acoustic transducer. A portable terminal device configured to seal the back side space of the mobile phone.   2. The portable device according to claim 1, wherein the holding unit holds the acoustic transducer such that a front-side space is formed between the acoustic transducer and an inner surface of the housing in which the opening is provided. Terminal device.   The portable terminal device according to claim 1, wherein the acoustic transducer includes an electrical connection member that is electrically connected to the circuit board between the acoustic transducer and the circuit board.   4. The mobile terminal according to claim 1, wherein the acoustic transducer is urged toward the inner surface of the housing by an urging member provided between the circuit board and the circuit board. 5. apparatus.   The portable terminal device according to any one of claims 1 to 4, wherein the holding member is formed of a self-adhesive material. The circuit board has an electronic component mounted on a surface facing the inner surface of the housing,
The portable terminal device according to claim 1, wherein the holding member is disposed so as to accommodate the electronic component in the back side space.   The holding member has a portion where the rib portion abuts on the circuit board and a portion abuts on the electronic component, and is formed to have a step shape along the abutting electronic component. The mobile terminal device according to claim 6.

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