JP5409418B2 - Electronics - Google Patents

Description

  The present invention relates to an electronic device including a speaker and a microphone, such as a digital camera or a mobile phone.

  Conventionally, a technique has been proposed in which a microphone and a speaker are assembled to one holding member, and the assembled microphone and speaker are elastically held to make it difficult to come off (Patent Document 1). Further, since the output signal of the microphone is susceptible to noise from other signal lines or the like, a technique has been proposed in which it is difficult to receive noise using a differential amplifier (Patent Document 2).

JP-A-9-271090 JP 2005-252945 A

  The above-mentioned Patent Document 1 does not disclose a measure for suppressing noise superposition on the microphone output signal. Wiring between the speaker and the microphone is performed using a cable or a flexible printed board, but when the cable is used, noise from the speaker or the outside is easily superimposed on the microphone output signal. When a flexible printed circuit board is used, a microphone output signal line is disposed on one surface of the double-sided flexible printed circuit board, and a ground (GND) pattern is disposed on the other surface, so that noise to the microphone output signal can be reduced. It is necessary to suppress superposition, and the cost increases.

  On the other hand, in Patent Document 2, by using a differential amplifier, it is possible to suppress noise from being superimposed on the microphone output signal. However, since a differential circuit is required, the cost increases.

Accordingly, an object of the present invention is to provide an electronic device that can improve the assembly efficiency of the speaker and the microphone to the holding member and can suppress the superposition of noise on the microphone output signal at low cost. To do.

In order to achieve the above object, an electronic device of the present invention includes a single-sided flexible wiring board on which a speaker and a microphone are mounted, a speaker holding unit that holds the speaker, and a holding member that has a microphone holding unit that holds the microphone. , wherein the retaining member is in a state where the single-sided flexible wiring board is folded, each of the speaker and the microphone is more retained in the speaker holding portion and the microphone holder, of the single-sided flexible wiring board the output signal line for the microphone is disposed adjacent to the signal line for the speaker, and characterized in that the previous SL ground signal line microphone is disposed between the signal line and the output signal line To do.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to improve the assembly | attachment efficiency to the holding member of a speaker and a microphone, the superimposition of the noise to a microphone output signal can be suppressed at low cost.

It is a disassembled perspective view of the principal part of the digital camera which is 1st Embodiment of the electronic device of this invention. It is the disassembled perspective view which looked at FIG. 1 from the downward direction. It is a perspective view which shows the state before attaching a speaker and a microphone to a holding member. It is the perspective view seen from the downward direction of FIG. It is a perspective view which shows the state after attaching a speaker and a microphone to a holding member. It is the sectional view on the AA line of FIG. It is a perspective view which shows the example of a connection of a single-sided flexible wiring board and a main wiring board. It is a figure which shows the state of the single-sided flexible wiring board before folding the mounting part of a speaker. It is an enlarged view of the mounting part of a microphone. In the digital camera which is 2nd Embodiment of the electronic device of this invention, it is a figure which shows the state of the single-sided flexible wiring board before folding the mounting part of a speaker. It is a figure which shows the state of the single-sided flexible wiring board after folding the mounting part of a speaker.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is an exploded perspective view of essential parts of a digital camera which is a first embodiment of an electronic apparatus according to the present invention, and FIG. 2 is an exploded perspective view of FIG. 1 viewed from below.

  As shown in FIG. 1, the digital camera according to the present embodiment has a hole 101 a for releasing sound output from the speaker 102 a to the upper surface of the front cover 101. Holes 101bL and 101bR for collecting sounds input from the outside by the left audio input microphone 102bL and the right audio input microphone 102bR are formed on the left and right sides of the hole 101a of the front cover 101. The microphones 102bL and 102bR are composed of, for example, silicon microphones.

  A release button groove 101c (not shown) for operating the release switch 102c and a power button hole 101d (not shown) for operating the power switch 102e are formed on the upper surface of the front cover 101. Yes. Furthermore, a zoom lever hole 101e (not shown) for operating the zoom switch 102d is formed on the upper surface of the front cover 101.

  The speaker 102a, the left and right voice input microphones 102bL and 102bR, the release switch 102c, the zoom switch 102d, and the power switch 102e are mounted on a flexible printed circuit board (hereinafter referred to as "FPC") 102. The FPC 102 is electrically connected to a main wiring board 106 described later. The speaker 102a and the microphones 102bL and 102bR mounted on the FPC 102 are held by a holding member 104 formed of an elastic body such as rubber.

  A fixing plate 103 is disposed on the lower surface side of the FPC 102, and the fixing plate 103 is fixed to the FPC 102 with a double-sided tape or the like. The fixed plate 103 has a pin-like crimped portion 103c. The fixed plate 103 is attached to the FPC 102 by inserting the crimped portion 103c into a positioning hole 102f formed in the FPC 102 and crimping. Positioned against.

  Further, a positioning hole 103b is formed in the fixed plate 103, and a positioning hole 102i is also formed at a position corresponding to the hole 103b of the FPC 102. By fitting these holes 103 b and 102 i into the protrusion 101 f (FIG. 2) of the front cover 101, the fixing plate 103 and the FPC 102 are positioned with respect to the front cover 101. Then, screws 105 are inserted into a plurality of screw holes 103 a formed in the FPC 102 corresponding to the plurality of screw holes 103 a formed in the fixing plate 103 and the screw holes 103 a and fastened to the front cover 101. Thereby, the FPC 102 is fixed to the front cover 101 together with the fixing plate 103.

  Next, a method of assembling the speaker 102a and the microphones 102bL and 102bR mounted on the FPC 102 to the holding member 104 will be described with reference to FIGS.

  3 is a perspective view showing a state before the speaker 102a and microphones 102bL and 102bR mounted on the FPC 102 are assembled to the holding member 104, and FIG. 4 is a perspective view seen from below in FIG.

  In the holding member 104, an opening 104a into which the speaker 102a is fitted is formed at the center, and openings 104b into which the microphones 102bL and 102bR are fitted are formed on the left and right sides. The opening 104a corresponds to an example of the speaker holding portion of the present invention, and the opening 104b corresponds to an example of the microphone holding portion of the present invention. The speaker 102a and the microphones 102bL and 102bR are assembled into the holding member 104 by inserting the speaker 102a and the microphones 102bL and 102bR from below the holding member 104 into the opening 104a and the left and right openings 104b, respectively.

  FIG. 5 is a perspective view showing a state after the speaker 102a and the microphones 102bL and 102bR mounted on the FPC 102 are assembled to the holding member 104. FIG.

  As shown in FIG. 5, an elastic cylindrical body 102j protruding to the upper surface portion side is attached to the periphery of the speaker 102a on the side facing the upper surface portion of the front cover 101. Further, around the sound output surfaces of the microphones 102bL and 102bR of the holding member 104, a substantially quadrangular annular convex portion 104c is doubled. In addition, you may arrange | position three or more annular convex parts 104c.

  FIG. 6 is a cross-sectional view of a main part in a state where the FPC 102 and the fixing plate 103 in which the speaker 102a and the microphones 102bL and 102bR are assembled to the holding member 104 are attached to the front cover 101. Equivalent to.

  As shown in FIG. 6, the fixing plate 103 is disposed so as to press the holding member 104 against the upper surface portion of the front cover 101, so that the annular convex portion 104 c of the holding member 104 It is pressed and stuck in an elastically deformed state. As described above, since the annular protrusion 104c is arranged in a double manner, the sealing performance with the front cover 101 can be improved, and the sound input characteristics of the microphones 102bL and 102bR can be improved.

  Further, since the fixing plate 103 is arranged so that the elastic cylindrical body 102j around the speaker 102a is also pressed against the upper surface portion of the front cover 101, the elastic cylindrical body 102j is also elastically applied to the back surface of the upper surface portion of the front cover 101. Pressed in a deformed state to make close contact.

  Further, the fixed plate 103 is provided with a diaphragm convex portion 103d at a position facing the opening 104b into which the microphones 102bL and 102bR of the holding member 104 are fitted. After the speaker 102a and the microphones 102bL and 102bR are assembled to the holding member 104, the microphone 104bL and 102bR make it difficult for the microphones 102bL and 102bR to pick up the sound inside the camera by closing the opening 104b with the diaphragm convex portion 103d.

  FIG. 7 is a perspective view showing an example of connection between the FPC 102 and the main wiring board 106. The main wiring board 106 is connected to the inter-board connector 102g of the FPC 102. An audio circuit block including an audio IC 106a is mounted on the main wiring board 106.

  The audio circuit block 106b includes a microphone amplifier that amplifies an electrical signal of sound output from the microphones 102bL and 102bR. In addition, the audio circuit block 106b converts an audio analog electrical signal output from the microphone amplifier into a digital signal by the A / D conversion unit and records it as audio data.

  Also, the audio circuit block 106b processes and converts the digital audio data sent from the A / D converter in the audio signal processor, and converts the processed digital signal into an analog signal in the D / A converter. Furthermore, the audio circuit block 106b amplifies the analog signal sent from the D / A converter in the audio output amplifier. The analog signal amplified by the audio output amplifier is output from the speaker 102a or an audio cable (not shown).

  Here, in this embodiment, as the FPC 102, a single-sided flexible wiring board in which a copper pattern is wired on a base film made of polyimide and the surface thereof is covered with a cover lay made of polyimide is also used. Then, by folding the mounting portion of the speaker 102a on the single-sided flexible wiring board, the speaker 102a is disposed between the left and right microphones 102bL and 102bR as shown in FIGS.

  This will be specifically described below. FIG. 8 is a diagram illustrating a state of the FPC 102 before the mounting portion of the speaker 102a is folded back.

  As shown in FIG. 8, before the speaker 102a is mounted, the speaker 102a and the left and right microphones 102bL and 102bR are mounted side by side. From this state, the mounting portion of the speaker 102a is folded back, for example, at a position L1 between the speaker 102a and the left microphone 102bL. Accordingly, the speaker 102a is disposed between the left and right microphones 102bL and 102bR, and the sound output surface of the speaker 102a and the sound input surface of the microphones 102bL and 102bR are disposed in the same direction.

  Here, when the speaker 102a and the microphones 102bL and 102bR are assembled to the holding member 104, the microphone 102bL and 102bR are assembled to the holding member 104, and then the mounting portion of the speaker 102a is folded and the speaker 102a is assembled to the holding member 104.

  That is, first, before folding the mounting portion of the speaker 102a of the FPC 102, the microphones 102bL and 102bR are respectively pressed and assembled from below the holding member 104 into the left and right openings 104b. Thereafter, the mounting portion of the speaker 102a of the FPC 102 is folded back at, for example, the position L1, and the speaker 102a is pushed into the opening 104a from the lower side of the holding member 104 and assembled. Thereby, by adjusting the folding position L1 according to the position of the opening 104a, the assembly efficiency is improved as compared with the case where the speaker 102a and the microphones 102bL and 102bR are assembled to the holding member 104 at once, and the FPC 102 The disconnection can also be suppressed.

  The FPC 102 is directly soldered to the outer peripheral side 208 of the back surface of the speaker 102a, and the FPC 102 is attached to the center portion 208a of the back surface of the speaker 102a with a double-sided tape or the like. Thereby, even when a load is applied when assembling the speaker 102a to the holding member 104, the stress acting on the soldered portion can be reduced.

  Next, a wiring example of the FPC 102 will be described with reference to FIGS. FIG. 9 is an enlarged view of a portion where the microphones 102bL and 102bR of the FPC 102 shown in FIG. 8 are mounted.

  In FIG. 9, the output signal line 202 is connected to the output signal terminal 202a of the left microphone 102bL, and the output signal line 205 is connected to the output signal terminal 205a of the right microphone 102bR.

  A GND signal line (ground signal line) 201 is connected to the GND signal terminals 201a and 201b of the left microphone 102bL, and a GND signal line 204 is connected to the GND signal terminals 204a and 204b of the right microphone 102bR. A GND signal line 201 is wired with a solid surface on the lower surface side of the left microphone 102bL, and a GND signal line 204 is wired with a solid surface on the lower surface side of the right microphone 102bR. Prevents contamination.

  The power signal line 203 for driving the left microphone 102bL and the right microphone 102bR is connected to the power signal terminal 203a of the left microphone 102bL and the power signal terminal 203b of the right microphone 102bR. In the present embodiment, the power signal line 203 is a common signal line for the left and right microphones 102bL and 102bR. For this reason, the power supply signal line 203 can be wired between the output signal line 202 of the left microphone 102bL and the output signal line 202 of the right microphone 102bR to facilitate wiring on a single-sided flexible wiring board.

  In addition, by wiring the common power signal line 203 between the output signal line 202 of the left microphone 102bL and the output signal line 205 of the right microphone 102bR, the output signals of the left and right microphones 102bL and 102bR can influence each other. It is preventing. Further, by sharing the power supply even in the single-sided flexible wiring board, the number of pins of the inter-board connector 102g when connecting to the main wiring board 106 can be reduced, and the cost can be reduced.

  In addition, the GND signal line 201 of the left microphone 102bL is disposed between the plus signal line 206 of the speaker 102a and the output signal line 202 of the left microphone 102bL. The negative signal line 207 of the speaker 102a is disposed along the GND signal line 201 of the left microphone 102bL with the positive signal line 206 interposed therebetween. Thus, by arranging the GND signal line 201 of the left microphone 102bL between the plus signal line 206 of the speaker 102a and the output signal line 202 of the left microphone 102bL, the noise of the speaker signal is added to the output signal of the left microphone 102bL. Can be prevented from overlapping.

  In FIG. 8, an operation system switch signal line group 209 includes signal lines of a power switch 102e, a release switch 102c, and a zoom switch 102d, and is disposed adjacent to the output signal line 205 of the right microphone 102bR. Between the operation system switch signal line group 209 and the output signal line 205 of the right microphone 102bR, the GND signal line 204 of the right microphone 102bR is arranged, so that the output signal of the right microphone 102bR is transmitted from the operation system. It is possible to prevent noise such as static electricity from being superimposed.

  In the check pad group 210, the signal lines of the speaker 102a and the microphones 102bL and 102bR are exposed in a circle. By applying a probe to the check pad group 210, it is possible to detect each signal of the speaker 102a and the microphones 102bL and 102bR and confirm whether there is a disconnection due to a mounting failure in the unit assembly state. Further, by applying a probe to the check pad group 210, it is possible to check whether the left and right microphones 102bL and 102bR have a sensitivity difference greater than a specified value.

  As described above, in this embodiment, after the microphones 102bL and 102bR are assembled to the opening 104b of the holding member 104, the mounting portion of the speaker 102a is folded and the speaker 102a is assembled to the opening 104a of the holding member 104. Yes. Thereby, compared with the case where the speaker 102a and microphone 102bL, 102bR are assembled | attached to the holding member 104 at once, assembly | attachment efficiency can be improved.

  In the present embodiment, the GND signal line 204 is arranged between the operation system switch signal line group 209 and the output signal line 205 of the right microphone 102bR using a single-sided flexible wiring board. Further, a GND signal line 201 is disposed between the plus signal line 206 of the speaker 102a and the output signal line 202 of the left microphone 102bL. Thereby, it is possible to suppress the superimposition of noise on the output signals of the left and right microphones 102bL and 102bR at low cost.

(Second Embodiment)
Next, a digital camera which is a second embodiment of the electronic apparatus of the invention will be described with reference to FIGS. FIG. 10 is a diagram showing a state of the FPC 102 before the mounting portions of the speakers 102aL and 102aR are folded back, and FIG. 11 is a diagram showing a state of the FPC 102 after the mounting portions of the speakers 102aL and 102aR are folded back. In the present embodiment, only the parts different from the first embodiment will be described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted. To do.

  In the present embodiment, as shown in FIG. 10, before the left and right speakers 102aL and 102aR of the FPC 102 are folded back, the right speaker 102aR, the left speaker 102L, the left microphone 102bL, and the right microphone 102bR are arranged in this order. ing. From this state, the mounting portions of the left and right speakers 102aL and 102aR are folded back, for example, at a position L2 between the left speaker 102aL and the left microphone 102bL.

  Accordingly, as shown in FIG. 11, the right speaker 102aR is disposed between the left and right microphones 102bL and 102bR, and the left speaker 102aL is disposed so as to sandwich the left microphone 102bL between the right speaker 102aR. In the state shown in FIG. 11, the sound output surfaces of the left and right speakers 102aL and 102aR and the sound input surfaces of the left and right microphones 102bL and 102bR are arranged to face the same direction.

  Note that the holding member 104 to which the left and right speakers 102aL and 102aR and the left and right microphones 102bL and 102bR are assembled is the same as in the first embodiment, except that an opening into which the left speaker 102aL is fitted is added. Therefore, also in this case, the assembling efficiency can be improved as compared with the case where the speakers 102aL and 102a and the microphones 102bL and 102bR are assembled to the holding member 104 at a time.

  The GND signal line 201 of the left microphone 102bL is disposed between the plus signal line 211 of the left speaker 102aL and the output signal line 202 of the left microphone 102bL. On the opposite side of the plus signal line 211 of the left speaker 102aL from the GND signal line 201, a minus signal line 212 of the left speaker 102aL, a plus signal line 213 of the right speaker 102aR, and a minus signal line 214 of the right speaker 102aR. Has been placed. Thereby, it is possible to prevent the noise of the speaker signal from being superimposed on the output signal of the left microphone 102bL. Other configurations and operational effects are the same as those of the first embodiment.

  The configuration of the present invention is not limited to those exemplified in the above embodiments, and the material, shape, dimensions, form, number, arrangement location, and the like are appropriately changed without departing from the gist of the present invention. Is possible.

  For example, in each of the above-described embodiments, the case where one or two speakers and two microphones are arranged has been illustrated. However, the present invention is not limited to this, and when at least one speaker and microphone are arranged, the same as above. The effect of this can be obtained.

  Further, in each of the above embodiments, the case where the speaker is arranged in the folded portion of the single-sided flexible wiring board is illustrated, but the present invention is not limited to this, and a microphone may be arranged in the folded portion, or the speaker is arranged in the folded portion. A microphone may be arranged.

101 Front cover 102 FPC
102a Speaker 102bL Microphone 102bR Microphone 104 Holding member

Claims (5)

A single-sided flexible wiring board on which a speaker and a microphone are mounted;
A holding member having a speaker holding part for holding the speaker and a microphone holding part for holding the microphone;
The holding member in a state where the single-sided flexible wiring board is folded, more holding each of said speaker and said microphone to said speaker holding portion and the microphone holder,
The output signal line for the microphone of the single-sided flexible wiring board is disposed adjacent to the signal line for the speaker ,
Electronic apparatus, characterized in that the pre-Symbol ground signal line microphone is disposed between the signal line and the output signal line. The multiple microphones are mounted on the single-sided flexible wiring board,
The holding member has a plurality of microphone holding portions for holding the plurality of microphones;
The speaker holding portion, an electronic apparatus according to claim 1, characterized in that it is placed between the plurality of microphones holding portion of the holding member. The ground signal lines microphone Rutotomoni the plurality of the operation system switches mounted is formed on the single-sided flexible wiring board,
One of the ground signal line for the plurality of microphones, according to claim 2, characterized in that disposed between the one of the operating system output signal line of the switch signal lines and the plurality of microphones of Electronic equipment. 4. The electronic apparatus according to claim 2, wherein a power signal line common to the plurality of microphones is formed on the single-sided flexible wiring board. The microphone and the speaker, any one of claims 1 to 4, characterized in that the voice input plane及beauty voice output surface before Symbol speaker of the microphone is held by the holding member so as to face the same direction The electronic device as described in the paragraph.

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