WO2004043113A1 - Portable electronic apparatus with diaphragm type speaker - Google Patents

Abstract

When a diaphragm type speaker (10) is contained in a speaker containing chamber (20), a side band body (2) is clued with a rear cover (5). Opening (5a) of the rear cover (5) becoming a sound discharge port P is sealed liquidtightly using adhesives P with a speaker diaphragm (22) functioning as a waterproof film. The speaker diaphragm (22) is a corrugated waterproof resin diaphragm inflating outward. A magnetic circuit constitutive member (24) is held movably in the axial direction by a tubular speaker casing (21) through a spring member (25). The magnetic circuit constitutive member (24) forms the magnetic path of a voice coil (23) and also functions as a protective member for regulating downward movement of the speaker diaphragm (22) when a hydraulic pressure is applied. According to the arrangement, the speaker diaphragm (22) also functions as a waterproof film and a pressure regulation film.

Description

 Description Portable electronic equipment with diaphragm-type speaker

 The present invention relates to a diaphragm-type waterproof structure provided in a portable electronic device such as a wristwatch-type cellular phone. Background art

 Small portable electronic devices such as mobile phones, especially wrists that are worn on the wrist. Portable electronic devices such as watch-type mobile phones have many opportunities to come into contact with water when used in the rain or when washing hands. Therefore, it is required to adopt a waterproof structure. This is because water easily penetrates into portable equipment without or with low waterproof performance, which can cause failure.

 By the way, in a general electronic device having a diaphragm type speaker, the opening of the speed force storage chamber formed in the device housing is closed by a lid member, and is not a completely sealed type. The cover member has a large-diameter spur mounting hole and a small-diameter through hole. The speaker is fixed to the lid member by closing the speaker mounting hole with a speed diaphragm. Through the small-diameter through-hole, the spike force storage chamber is always kept at the pressure of the outside air. However, such an imperfectly sealed structure has low waterproof performance, and water easily enters the equipment, which causes a failure.

Therefore, a diaphragm-type speaker with a completely sealed waterproof structure was developed. This conventional completely sealed waterproof speaker has a pressure regulating chamber in which the volume changes according to the pressure of the outside air and the pressure of the inside without providing the small-diameter through-hole, and is provided in the speed force storage chamber. Things. The pressure adjustment chamber, For example, it is a rubber tube that is thinner and more flexible than the speed diaphragm. The structure of such a completely sealed type with a pressure adjustment chamber is complicated, and it is difficult to fit it in a limited space such as a part of a portable device. Therefore, there is a problem that it cannot be applied to a small-sized portable electronic device in which a large-sized speaker storage room cannot be formed (for example, refer to Japanese Patent Application Laid-Open No. 11-131967). ― '

 In addition, the speed of a completely sealed waterproof structure using a deformable resin film as a waterproof film has already been disclosed. In this completely sealed waterproof speaker, the opening of the speaker housing is liquid-tightly closed by the deformable film. The piezoelectric speaker is adhered to the back side of the deformable film, that is, to the surface of the inside waterproof area. ”(See, for example, Japanese Patent Application Laid-Open No. 2001-36982).

 Also disclosed is a completely sealed type waterproof speaker in which the opening of the speaker storage room is closed with a waterproof film and a protective member having air permeability for regulating deformation of the waterproof film is provided in the speaker storage room. . However, a speaker having a completely sealed waterproof structure using a waterproof film like this has a problem that the presence of the waterproof film causes deterioration of the acoustic performance (see, for example, Japanese Patent Application Laid-Open No. 2000-101). -See Japanese Patent Application Publication No. 128282 /; -The problem to be solved by the present invention is to provide a portable electronic device equipped with a diaphragm-type speaker that maintains high waterproof performance in a daily living environment without deteriorating acoustic performance. Disclosure of the invention

In order to solve the above-mentioned problems, a diaphragm-type speaker having a waterproof corrugated diaphragm speaker diaphragm, a voice coil, and a magnetic circuit component is housed in a speaker force storage chamber formed in an equipment housing. In the portable electronic device, the speed diaphragm is made to function as a waterproof film, and the lid portion is formed. A pressure-controlling film is formed by forming a completely closed-type speed force storage chamber covered with a material, and by holding the magnetic circuit components in the speaker housing so as to be movable in the axial direction. It works very well. That is, a portable electronic device provided with a diaphragm-type speaker that solves the above-described problem stores a diaphragm-type speed force ′ having a wave-shaped diaphragm speaker diaphragm in a speed force storage room formed in a device housing. In addition, the portable electronic device is a completely sealed type in which the speed storage chamber functions as a waterproof film of the speed force diaphragm and is covered with a cover member.

The diaphragm loudspeaker is made of a cylindrical speaker housing and an outer periphery at an upper opening of the cylindrical speaker housing. A diaphragm speaker diaphragm; a concentric voice coil mounted on the back surface of the speed diaphragm; and A magnetic circuit component that functions as a seating surface on which the spin force diaphragm is seated when the magnetic force is applied, and the circular spin component that can move the magnetic circuit component in the axial direction. panel members to the body [this ^holding; etc. also of a is constructed from.

 In the portable electronic device having the diaphragm-type speed force, the seating surface of the magnetic circuit component is a flat surface on which the back surface of the resin speed force diaphragm is seated when high water pressure is applied.

 In the portable electronic device provided with the diaphragm-type speaker, the resin-made diaphragm is bonded to a cylindrical opening formed in the lid member with a flexible waterproof adhesive.

In the portable electronic device having the diaphragm-type speed, the magnetic circuit component is held at three points in the cylindrical speed housing by three panel panels. In the portable electronic device having the diaphragm-type speed, the cover member that covers a part of the device housing has a plurality of sound emission ports formed therein, and corresponds to an upper opening of the cylindrical speed housing. The rear surface is composed of a horizontal flat surface at the center and an inclined surface at the periphery.

 -In the portable electronic device provided with the diaphragm type speaker, the diaphragm type speaker is mounted on a bottom surface of the speaker storage chamber via an annular buffer member. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is a sectional view of an embodiment of a wristwatch-type mobile phone to which the present invention is applied.

 FIG. 2 is a cross-sectional view of a main part of a wristwatch-type mobile phone having a diaphragm-type speed according to the first embodiment.

 FIG. 3 is a plan view of one embodiment of a plate panel for holding a diaphragm-type speed diaphragm.

 FIG. 4 is a cross-sectional view of a main part of a wristwatch-type mobile phone having a diaphragm-type speed according to the first embodiment when a high water pressure is applied. FIG. 5 is a cross-sectional view of a main part of a wristwatch type mobile phone having a diaphragm type speed according to a second embodiment.

 FIG. 6 is a cross-sectional view of a main part of a wristwatch-type mobile phone having a diaphragm type speed of the second embodiment when a high water pressure is applied. BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 is a sectional view of a wristwatch-type mobile phone to which a waterproof diaphragm-type speaker 10 of the present invention is applied. In FIG. 1, the device housing of the wristwatch-type mobile phone is composed of a main body case portion in which a functional portion including an electronic circuit is stored, and a housing. 12:00 o'clock band where diaphragm-type speed force 10 is stored, 6 o'clock band where microphone 11 is stored, and the body case and 1 o'clock band are connected 1 It comprises a 2 o'clock side hinge 7 and a 6 o'clock side hinge 8 that connects the main body case portion and the 6 o'clock side band portion. The main body case portion includes a body main body 1 and a back cover 4 thereof, and the 12 o'clock side band portion includes a 12 o'clock side band main body 2 and a back cover 5 thereof. The 6 o'clock band is composed of the 6 o'clock band main body 3 and the back cover 6 thereof. The body 1 has a display window 12 such as a liquid crystal panel. The operation button 9 is provided on the 6 o'clock side band body 3.

 The microphone storage room in which the microphone 1-1 is stored is a storage room formed in the 6 o'clock side band main body 3 and having an opening of a predetermined shape and size. On the back cover 6 of the 6 o'clock side band, the sound receiving Q of the microphone 11 is formed.

The speaker storage chamber 20 is formed by closing a bottomed cylindrical chamber formed in the 12 o'clock side band main body 2 with a back cover 5. The only opening of the spike storage chamber in which the diaphragm type speaker 10 is stored is the opening of the bottomed cylindrical chamber. The back cover 5 of the 12 o'clock side band is provided with a speaker sound output port Ρ. In the waterproof structure of the first embodiment shown in FIGS. 2 to 4, the diaphragm speaker 10 is an electrodynamic speaker, and includes an upper annular step 21 a and a lower annular step 21 b. A cylindrical speaker housing 21 having an annular bottom 21 c formed on the inner peripheral surface, and a waterproof resin speaker having an outer peripheral end fixed to an upper annular step 2 la of the cylindrical speaker housing 21. Vibrating plate 22, speaker Concentric cylindrical voice coil 23 fixed to the back of diaphragm 22, and magnetic circuit component 2 magnetically coupled to voice coil 23 to which voice signal current is input 4 and a leaf spring 25 for holding the magnetic circuit component 24 in the lower annular step 21b of the cylindrical speed housing 21. The waterproof resin-made speaker diaphragm 22 is a waterproof corrugated diaphragm having a plurality of concentric irregularities and swelling substantially outward. That is, in the resin speaker diaphragm 22, the surface between the mounting position of the voice coil 23 and the outer peripheral end is curved to the front side, and the surface between the mounting position of the voice coil 23 and the center is also It curves to the front and consequently the central surface is concave inward. Therefore, the corrugated resin, speaker diaphragm 22 has a plurality of irregularities between the ends of the longitudinal section passing through the center. In this embodiment, the diaphragm-type speed force diaphragm used in the small-sized portable electronic device is formed of a polyimide film having a thickness of 38 m. Of course, the material and thickness of the diaphragm are not limited to the above, and any material having water resistance and flexibility can be applied.

 • The magnetic circuit components 24 shown by the blocks are disk-shaped magnetic members incorporating permanent magnets (not shown). For example, a disk-shaped permanent magnet is fixed to a magnetic yoke. ing. The magnetic circuit component 24. Is formed with an annular groove 2 ′ 4 a through which the concentric cylindrical voice coil 23 approaches and exits. In addition, an annular protrusion 24 b is formed on the outer peripheral surface of the magnetic circuit component 24. The magnetic circuit component 24 is provided by a plate panel 25 disposed between the annular projecting portion 24b and the lower annular step 21b of the cylindrical speaker housing 21; It is held in a cylindrical speaker housing 21.

 In the present invention, the magnetic circuit constituent member 24 is one of electro-acoustic conversion members that vibrate the resin speaker diaphragm 22 by magnetically coupling with the voice coil 23 to which the audio signal current is input. However, as described later, the resin-made vibrating plate 22 functions as a protective member when it expands inward due to water pressure.

The diaphragm-type speed force 10 is formed on the 12:00 o'clock side band body 2. It is housed in the speaker housing room 20 of the bottomed cylindrical room. The diaphragm-type speaker 10 has upper and lower ends of the cylindrical speaker housing 21 sandwiched between the back cover 5 of the 12 o'clock side band and the 12 o'clock side band body 2 to which the cushion 26 is fixed. And is fixed to the device housing. That is, the diaphragm-type speaker 10 is housed in the speed force storage chamber 20 such that the annular bottom 21 c of the cylindrical speaker housing 21 abuts on the cushion 26, and The upper end of the speed-shaped housing 21 is pressed by the back cover 5 of the 12 o'clock side band. The back cover 5 is formed with one sound emission port 5 a having a diameter slightly smaller than the speaker diaphragm 22 of the diaphragm type speaker 10.

1 The back cover 5 of the 2 o'clock band is fitted and fixed to the 1.2 o'clock band main body 2, but the back cover 5 of the 2 o'clock band is a cylindrical speaker housing 2 1: also mated. That is, on the back cover 5 of the 12 o'clock side band, an inner annular projection 5b and an outer annular projection 5c for fitting the 'spiger storage chamber 20' are formed. The upper end of the cylindrical speaker housing 21 is fitted between the annular projections 5b and 5c. An adhesive R is filled in a fitting surface between the inner annular projection 5b and the outer annular projection 5c 'and the upper end' of the cylindrical speed housing 21. The adhesive R is also applied to the annular portion where the inner peripheral surface of the opening 5a of the back cover 5 of the 2 o'clock side band contacts the outer peripheral portion of the surface of the resin speaker diaphragm 22. . ′ In this way, the diaphragm-type spur 10 is housed and fixed in the 12 o'clock side band, which is the equipment housing, and the speaker storage room formed in the 12 o'clock side band main body 2. The 20 openings are sealed in a liquid-tight manner. Although not shown, a necessary waterproof seal is applied to the engagement portion between the 12 o'clock side band main body 2 and the back cover 5 in addition to the waterproof seal with the adhesive R. . Therefore, the speaker storage room 20 is completely sealed, and the diaphragm-type speaker force 10 housed and fixed in the 12 o'clock side band is a completely sealed type waterproof speaker. The cushion 26 is an annular cushioning member fixed to the bottom surface 20b of the speed storage chamber 20 with an adhesive or the like, and is made of silicon rubber or the like. The cushion 26 is a cushioning member that acts to prevent the speaker 10 from peeling off the back cover 5 of the 12 o'clock side band when water pressure is applied. That is, when the water pressure is applied, the pressure 10 is depressed so that the cylindrical speaker housing 21 is peeled off from the inner peripheral surface of the outer annular projection 5c of the 12 o'clock side band back cover 5. In the cushion 26, a force ^s to which a strong downward force is applied, an upward force is applied to the cylindrical force housing 21. By the action of the cushion 26, the speaker 10 does not peel off from the back cover 5 of the 12 o'clock side band even when water pressure is applied.

 'The cushion 26 is formed in an annular shape as described above. This is to increase the volume of the rear acoustic space 27 as much as possible in the narrow internal space of the speaker storage room 20 formed in the device housing of a small portable electronic device, and to secure a predetermined acoustic performance. That's why.

-The panel panel 25 that holds the magnetic circuit components 24 on the lower annular step 21b of the cylindrical speaker housing 21 is a ring-shaped outer panel panel 25 as shown in the plan view of FIG. This is a three-point holding type leaf spring composed of a, a ring-shaped inner leaf spring 25b, and a ring-shaped connection leaf spring 25c. The ring-shaped inner leaf springs 25b are higher than the ring-shaped outer leaf springs 25a, and the ring-shaped connecting leaf springs 25c that connect them are inclined. I have. The cross-sectional views of the leaf spring 25 shown in FIGS. 2, 4, 5, and 6 are cross-sectional views cut along AA ′ in FIG.

Note that the number of panel members that can move the magnetic circuit component 24 in the axial direction and hold the magnetic circuit component 24 in the cylindrical pressure housing 21 is not limited to the three-point holding plate panel 25, but is two. It is sufficient that a plurality of points can be held as described above. For example, an ordinary coil spring can be used. In this case, the inner diameter portion of the coil panel The magnetic circuit component 24 is fitted into the cylindrical speaker housing 24 so that the magnetic circuit component 24 is movable and held in the cylindrical speaker housing 21.

 In the first embodiment of the present invention configured as described above, when water pressure is applied, the corrugated speed force diaphragm 22 is deformed and comes into contact with the upper surface of the magnetic circuit component 24. In a state where a higher water pressure is applied, the magnetic circuit constituent member 24 moves in a direction in which the plate panel 25 is compressed by the water pressure applied to the corrugated speed force diaphragm 22. The amount of movement of the magnetic circuit component 24 is up to the upper surface of the annular bottom portion 21 c which is a contact position provided on the cylindrical speaker housing 21. That is, the magnetic circuit component 2 moves from the position shown in FIG. 2 to the position shown in FIG. 4 in a state in which the corrugated speaker diaphragm 22 is seated. In other words, the internal volume of the completely closed speaker storage room 20 is larger than the size shown in FIG. It is compressed to the size shown in Figure 4 'with the amount regulated. '

 Due to the compressed volume, the internal pressure of the speed force accommodating chamber 20 rises, and the water pressure applied to the wavy speaker diaphragm 22 is balanced. Therefore, the wave-shaped speaker diaphragm 22 is only deformed, and the material is not elongated and plastically deformed.

At a higher water pressure than this, the portion where the wall of the magnetic circuit component 24 does not exist, that is, the outer peripheral portion where the corrugated speaker diaphragm 22 is not seated on the magnetic circuit component 24 comes to withstand water pressure. Since the internal pressure of the speaker storage chamber 20 also increases due to the deformation of the one-way vibration plate 22, the difference between the pressure applied to the front surface and the back surface of the wavy speaker vibration plate 22 is reduced. I have. Therefore, by adopting an appropriate material and shape, in the range of use, the outer peripheral portion of the corrugated force diaphragm 22 that is not seated on the magnetic circuit component 24 can be plastically deformed. Absent. Thus, the waterproof wave-shaped speaker diaphragm 2 2 Has a structure that functions simultaneously as a waterproof film, pressure control film, and speaker diaphragm, and can withstand relatively high water pressure.

 In short, the magnetic circuit component 24 is fixed by the spring 25 when operating as a speed force, but the speed is increased when water pressure is applied to the corrugated speed diaphragm 22. It functions as a protection member that supports the deformation of the force diaphragm 22 and prevents the plastic deformation of the wave-shaped speed force diaphragm 22. As a result, the corrugated spike diaphragm 22 that is deformed by being supported by the magnetic circuit component 24 that functions as a protective member functions as a waterproof film and functions as a pressure adjusting film. It works.

 When the water pressure is removed, the magnetic circuit component 2.4 moves to its original position due to the elasticity of the panel 2.5, and the corrugated speaker diaphragm 22 returns to its original shape. Therefore, the acoustic performance of the speaker is not impaired. '

 Next, the waterproof structure of the second embodiment shown in FIGS. 5 and 6 is the same as the waterproof structure of the first embodiment described above, except that a means for preventing plastic deformation of the speed diaphragm in a high-temperature environment is provided. Things. That is, in the waterproof structure of the above-described fifth embodiment, the back cover 5 covering the 12 o'clock side band main body 2 in which the speaker storage chamber 20 is formed is the same as the sway force diaphragm 22. It is a lid member with one sound emission port 口 with a slightly smaller diameter. On the other hand, in the waterproof structure according to the second embodiment, the back cover 5 that covers the 11 o'clock side band body 5 in which the speaker storage chamber 20 is formed is larger than the speed force diaphragm 22. This is a lid member with a plurality of very small diameter sound output ports. Moreover, in the back cover 5, the back surface of the portion where the plurality of sound output holes are formed is composed of a central portion 5b of a horizontal flat surface and a peripheral portion 5c of an inclined surface.

-With such a configuration, when the air inside the speaker housing 20 expands in volume under a high-temperature environment, the corrugated speaker diaphragm 22 further expands from the state shown in FIG. State. Lid member with multiple sound output ports P The distance between the back surface of 5 and the front surface of the corrugated speaker diaphragm 22 is determined in consideration of the state where the corrugated speaker diaphragm 22 expands to the maximum in the operating temperature range. Accordingly, in the corrugated speaker diaphragm 22 that has expanded in a high-temperature environment, the back surface of the lid member 5 in which the plurality of sound output ports P are formed serves as a wall, and further expansion is prevented. In this way, even in the high-temperature environment, even if the air volume inside the speaker storage chamber 2.0 expands and the pressure rises accordingly, the corrugated speaker diaphragm 2 2. There is no. ·

 When the temperature returns to the room temperature from the high-temperature environment, the corrugated single force diaphragm 22 immediately restores to its original shape, so that the speaker performance is not impaired. Industrial applicability

 : According to the present invention, a portable electronic device equipped with a diaphragm-type speaker that maintains high waterproof performance in a daily living environment without deteriorating acoustic performance can be provided. Moreover, in the portable electronic device provided with the diaphragm type speaker according to the present invention, the waterproof structure of the waterproof type is configured so that the wave type speaker diaphragm can also function as a waterproof film and a pressure adjusting film. The speaker has a relatively simple structure and a low-cost waterproof structure. Therefore, a speaker having a waterproof structure particularly suitable for small portable electronic devices has been realized.

Claims

The scope of the claims 1. A portable electronic device in which a diaphragm-type speaker having a speaker diaphragm of a wave-shaped diaphragm, a voice coil, and a magnetic circuit component is housed in a speed storage room formed in a device housing.  A completely enclosed speaker housing covered with a lid member is formed so that the speed force diaphragm functions as a waterproof film, and a speed force housing is provided by allowing the magnetic circuit component to move in the axial direction. A portable electronic device having a diaphragm-type speech force, characterized in that the diaphragm is also functioned as a pressure adjusting film by holding the diaphragm.  2. · The diaphragm type speaker provided with the wave type diaphragm force diaphragm is stored in the speaker storage room formed in the device housing, and the speaker storage room is formed by waterproofing the speaker diaphragm with the waterproof film. In a portable electronic device that is completely sealed with a lid so as to function as a lid,  The diaphragm type speaker force is a cylindrical speaker or a housing. A diaphragm, a concentric cylindrical voice coil attached to a back surface of the speaker diaphragm, and a voice coil disposed at a position opposite to the voice coil to form a magnetic path of the voice coil, and the speech force when water pressure is applied. A magnetic circuit component that functions as a seating surface on which the diaphragm is seated; and a spring member that allows the magnetic circuit component to move in the axial direction and holds the magnetic circuit component in the cylindrical speaker housing. A portable electronic device with a diaphragm-type speed that is characterized by the following features. 3. The diaphragm type spinning force according to claim 2, wherein the seating surface of the magnetic circuit component member is a flat surface on which the back surface of the resin-made force diaphragm is seated when high water pressure is applied. Portable electronic devices equipped with. 4. The portable electronic device having a diaphragm-type speed according to claim 2, wherein the cylindrical speaker housing is bonded to a lid member of the speaker storage chamber with a waterproof adhesive.  5. The portable electronic device having a diaphragm-type speaker according to claim 2, wherein the magnetic circuit component is held at a plurality of points by the plurality of panel panels in the cylindrical speaker housing. ·  6. The opening of the speaker storage chamber is a cover member having a plurality of sound emission openings, and the center of the back surface is covered with a cover member having a flat surface and a peripheral portion having an inclined surface. 3. The portable electronic device according to claim 2, wherein said portable electronic device is provided with a diaphragm type force. .  7: The portable electronic device having a diaphragm-type speaker according to claim 6, wherein the cover member is formed integrally with a part of the device housing. 8. The portable electronic device having a diaphragm-type speaker according to claim 2, wherein the diaphragm-type speaker is mounted on a bottom surface of the speaker storage chamber via an annular buffer member.