JP4356393B2 - Electronic device and method for mounting capacitor in electronic device - Google Patents

Description

The present invention relates to a mounting method of a capacitor in an electronic machine Utsuwa及 beauty electronic devices, for example, an electronic still camera, a cellular phone, can be applied a PDA (Personal Digital Assistants) or the like. In the present invention, an anode electrode and a cathode electrode are alternately stacked to form a capacitor in a flat plate shape, and the capacitor is disposed along the surface of the exterior of the device, thereby allowing a large capacity capacitor to be formed. Even when the electronic device is provided, the electronic device can be thinned.

  2. Description of the Related Art Conventionally, portable electronic devices such as an electronic still camera have been thinned to improve portability. Therefore, thin electronic components are also applied to electronic components used for mounting. However, an electrolytic capacitor, which is a large-capacity capacitor, is thicker than other components, and this type of electronic device cannot avoid mounting such a large-capacity capacitor.

  That is, this type of electronic device is operated by a power source such as a secondary battery or a solar battery. However, these power supplies have a disadvantage that they have a relatively large internal resistance. With these power supplies, when a large current flows instantaneously, the power supply voltage drops drastically. For this reason, this type of electronic device is designed to reduce the impedance of the power source by reducing the power source voltage drop due to the instantaneous current by the power charged in the large-capacity capacitor, thereby ensuring stable operation.

  In addition, this type of electronic equipment is designed to boost such a power supply by a booster circuit such as a DC-DC converter to ensure a desired power supply voltage, and even in such a booster circuit, the power supply voltage is smoothed. A large-capacitance capacitor has been used for the purpose of achieving the above.

  In addition, some electronic still cameras illuminate a subject with a flash. In such an electronic device, a light source such as a xenon lamp is responsive to a shutter operation to generate a high voltage (about 250 [V] in the case of a xenon lamp). ), Which is driven instantaneously with a large electric power, and a driving power is supplied to such a light emitting body by the discharge of electric power charged in a large-capacitance capacitor (several hundreds [μF]). ing.

  As a result, in this type of electronic device, the overall thickness is limited by the thickness of such a large-capacitance capacitor, and as a result, there is a problem that it is difficult to reduce the thickness.

With respect to such portable electronic devices, for example, a method for storing batteries is proposed in Japanese Patent Application Laid-Open No. 2-79373.
JP-A-2-79373

The present invention has been made in view of the above, even when providing a large-capacity capacitor, and to propose a method of mounting a capacitor in an electronic machine Utsuwa及 beauty electronic device can be made thinner Is.

In order to solve the problem, the invention of claim 1 is applied to an electronic device and is formed into a flat plate shape by alternately laminating a case, an anode electrode and a cathode electrode, and has flexibility, A pair of terminals respectively connected to the anode electrode and the cathode electrode are provided on one surface, and the other surface is disposed in the case with a capacitor bonded to the inner surface of the case. An electronic component is mounted on the other surface, and a pair of elastic contact terminals is provided on the other surface, and the pair of contact terminals press the pair of terminals provided on the one surface of the capacitor, respectively. A wiring board for connecting an electronic circuit of the electronic component to the capacitor .

According to a sixth aspect of the present invention, the present invention is applied to a method for mounting a capacitor in an electronic device, wherein an anode electrode and a cathode electrode are alternately laminated to form a flat plate shape and have flexibility. The other surface of the capacitor provided with a pair of terminals connected to the anode electrode and the cathode electrode on the surface is bonded to the inner surface of the case, and a desired electronic component is mounted on the other surface. A wiring board provided with a pair of elastic contact terminals on the surface is disposed in the case, and the pair of terminals provided on the one surface of the capacitor with the pair of elastic contact terminals, respectively. The electronic circuit by the electronic component is connected to the capacitor by pressing .

  According to the configuration of the first aspect, the capacitor formed in a flat plate shape by alternately stacking the anode electrode and the cathode electrode can be reduced in thickness when applied to an electronic device. Thus, if the capacitor is disposed along the surface of the exterior so that the exterior surface and the anode electrode are substantially parallel, the shape can be reduced.

According to the configuration of claim 6, even when providing a large-capacity capacitor can provide a capacitor that can be thinner electronic devices. According to the ninth aspect of the present invention, it is possible to provide a method for mounting a capacitor in an electronic device that can reduce the thickness of the electronic device even when a large-capacity capacitor is provided.

  According to the present invention, even when a large-capacity capacitor is provided, the thickness can be reduced.

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

(1) Configuration of Embodiment 1 FIG. 1 is a perspective view showing an electronic still camera which is a portable electronic apparatus according to Embodiment 1 of the present invention. The electronic still camera 1 is formed in a thin horizontally long rectangular shape. When viewed from the front side, the electronic still camera 1 is provided with a lens 2 on one end of the horizontally long side, a finder window 3 and a flash 4 on the upper end side, and a microphone in the vicinity of the lens 2 at substantially the center. 5. A self-timer lamp 6 is provided. As a result, the electronic still camera 1 is configured such that an area where no electronic components exposed to the outside are provided is formed in a portion excluding the left side and the upper end side from the center on the front side. The electronic still camera 1 is further provided with a shutter button 7 and a power switch 8 on the upper end surface, and a liquid crystal screen, various operators, and the like on the back side.

  The electronic still camera 1 has a front case 10A on which the lens 2 and the like are provided in this way, and a back case 10B facing the front case 10A, and an exterior is formed on the cases 10A and 10B. A wiring board on which components are mounted is stored. In the front case 10A that forms the exterior as described above, the electronic still camera 1 has a large capacity along the inner side surface of the region where no electronic components exposed to the outside except for the upper left side from the center on the front side are provided. A capacitor 11 is provided.

  Here, as shown in FIG. 2A, the basic configuration of the capacitor is such that the electrodes 16A and 16B are opposed to each other with the dielectric 15 interposed therebetween. Conventionally, in an electrolytic capacitor that is a large-capacity capacitor, as shown in FIG. 2B, an anode electrode 16A formed with a dielectric film made of an oxide film, an electrolytic paper 17 containing an electrolytic solution, A laminated body in which cathode electrodes 16B made of aluminum foil are sequentially laminated is formed in an elongated sheet shape, and this laminated body is wound to form a cylindrical shape. As a result, in conventional large-capacitance capacitors, the thickness of these laminates is reduced and the width is further reduced to reduce the size, and the area of the laminate is increased to increase the capacitance. Has been made. In this case, in this conventional capacitor, the width of the laminated body × the diameter of the columnar shape is roughly the outer shape, and the thickness of the device to be mounted is limited by the width or the diameter.

  On the other hand, the large-capacity capacitor 11 applied to the electronic still camera 1 is an electrolytic capacitor, and as shown in FIGS. 2C and 2D, an electrolytic paper (not shown) is sandwiched therebetween. Thus, the anode electrode 16A and the cathode electrode 16B made of a sheet material are alternately stacked for the required capacity, and the whole is formed in a flat plate shape by sealing with a protective sheet. As a result, the capacitor 11 has a projected area of the electrodes 16A and 16B that is significantly larger than that of the conventional capacitor, and is extremely thin.

  Capacitor 11 has both electrodes 16A and 16B connected internally and connected to external terminals 18A and 18B (FIG. 2D), and connected to a desired circuit block via external terminals 18A and 18B. It is formed as possible. The capacitor 11 is formed such that these external terminals 18A and 18B are formed in a rectangular shape, and are provided side by side with such a flat plate shape so as to be substantially flat with the surrounding surface.

  Correspondingly, in the front case 10A (FIG. 1), the inner side surface of the region where no electronic parts exposed outside except for the upper left side from the center on the front side are provided along the capacitor 11. It is formed with a flat surface so that a useless space is not created by disposing the capacitor 11. Further, a step or protrusion for positioning is formed at a portion corresponding to the entire circumference of the capacitor 11 or formed at a part of the corresponding portion, thereby positioning the capacitor 11 having a flat plate shape easily and reliably. It is made to hold.

  That is, in the electronic still camera 1, as shown in FIG. 3 by cutting FIG. 1 along the line AA, the capacitor 11 has a surface on which the external terminals 18A and 18B are not provided facing the inner surface of the front case 10A. Thus, it hold | maintains along the inner surface of 10 A of front cases. In this embodiment, the capacitor 11 is provided on the inner surface of the case 10A by adhesion with an adhesive. For this reason, the capacitor 11 is supplied with a release sheet attached after an adhesive is applied in advance to the surface of the capacitor 11 where the electrodes 18A and 18B are not provided.

  Further, in the electronic still camera 1, in the assembly process of the front case 10A, the release sheet relating to the adhesive is removed and the capacitor 11 is pressed against the inner surface of the case 10A, so that the capacitor 11 is mounted on the case 10A. ing. After that, in the electronic still camera 1 (FIG. 3), the wiring board 22 on which various electronic components 21 are mounted is mounted on the case 10A so as to face the capacitor 11 substantially in parallel. The terminals 23A and 23B are in contact with the electrodes 18A and 18B of the capacitor 11, respectively, so that the capacitor 11 is connected to a circuit block formed on the wiring board 22.

  That is, FIG. 4 is an enlarged front view (FIG. 4A) and side view (FIG. 4B) showing the portions of the terminals 23A and 23B indicated by reference numeral B in FIG. The terminals 23A and 23B are formed in the same shape, and are formed into a V-shaped cross section in this embodiment by bending an elastic metal plate such as a phosphor bronze plate. As a result, the terminals 23A and 23B are flexed as a whole and are pressed against the electrodes 18A and 18B of the capacitor 11 with an appropriate pressing force, so that the terminals 23A and 23B are surely brought into contact with the electrodes 18A and 18B.

  Similarly, in the electronic still camera 1, after various electronic components, a wiring board, and the like are mounted on the back case 10B, the wiring board 22 on the front case 10A side and the wiring board on the back case 10B side are connected to each other. And the back case 10B is integrated and assembled. As a result, the electronic still camera 1 is designed to be reduced in thickness without being limited by the thickness of the conventional large-capacitance capacitor 11.

  FIG. 5 is a block diagram showing a peripheral circuit of the capacitor 11 in the electronic still camera 1. In the electronic still camera 1, a battery 25 that is detachably held is connected to a wiring board 22 on the front case 10 </ b> A side, and power of a secondary battery 26 built in the battery 25 is supplied to the wiring board 22. . The wiring board 22 supplies this power to a power circuit (not shown) via an electrolytic capacitor C1 and a bypass capacitor C2, and supplies power for operation to each circuit block from this power circuit. In FIG. 5, the symbol Rs is the internal resistance of the secondary battery 26.

  Further, the wiring board 22 starts up the operation of the DC-DC converter 28 in response to the shutter operation by the user under the control of a controller (not shown), and generates a high voltage for flash from the power supply supplied from the battery 25. To do. The wiring board 22 gradually charges the large-capacity capacitor 11 with this high voltage and gradually raises the terminal voltage of the capacitor 11. The wiring board 22 is configured to drive the flash 4 by discharging electric power stored in the capacitor 11 and thereby illuminate a desired subject.

(2) Operation of Example In the above-described configuration, the capacitor 11 applied to the electronic still camera 1 (FIG. 2) is an anode electrode 16A made of a sheet material by the required capacity with the electrolytic paper interposed therebetween. The cathode electrodes 16B are alternately laminated to form a flat plate shape. As a result, in the electronic device in which the capacitor 11 is mounted, for example, the capacitor 11 is arranged along the outer and inner side surfaces of the device, and the electronic device is remarkably compared with the case where a capacitor having a conventional shape is used. Can be made thinner.

  That is, usually, in an electronic device, in most cases, the inner surface of the case is formed by a flat surface, and a gap is provided between the flat surface and other electronic components. Thus, if the capacitor 11 is formed in a flat plate shape and the space of the gap is effectively used, a large-capacity capacitor can be arranged by effectively using the internal space of the device. This makes it possible to reduce the thickness of the device without being limited by the thickness of the capacitor, and to arrange this type of capacitor with almost no increase in internal space, compared to the case where no capacitor is provided. Can do.

  In addition, since such a gap is a portion having a relatively large area along the inside of the exterior of the device, particularly in a portable electronic device, the entire device is formed in a plate shape so as to be the size of the entire device. By contrast, since the area of such a flat region is large, even if the capacitor 11 is thinned, a sufficient electrode area can be ensured in the capacitor 11, thereby ensuring a sufficient capacity.

  That is, in a conventional capacitor having a cylindrical shape, if the area of the bottom surface related to the cylindrical shape is S1 and the height is H1, the capacitance is substantially proportional to S1 × H1. On the other hand, in the capacitor 11, when the area of the flat region that can be attached is S2, the thickness is S1 × H1 / S2 on the assumption that the same capacitance as that of the capacitor according to this conventional example is secured. As a result, for example, if S1 / S2 = 1/10, the thickness of the entire capacitor is 1/10, and in a general device, a larger ratio can be secured. The thickness can be drastically reduced to ensure a sufficient capacity.

  Further, when the capacitor 11 is formed in such a laminated structure, the efficiency can be improved by a so-called edge effect, and the capacity with respect to the volume can be increased also by this. As a result, it can be applied to a small portable device or the like, and can be used for a circuit having a large instantaneous current change. Specifically, the present invention can be applied to a circuit in which a current that flows instantaneously is large but a normal operation current is small, or a circuit in which such a normal operation current hardly flows.

  In addition, since the thickness can be reduced in this way, the capacitor 11 can be formed so as to have flexibility. Thus, even when the inner surface of the case is not a flat surface, the capacitor 11 can be used as long as it is a cylindrical surface. It is possible to effectively use the internal space of the device by arranging. Even when the thickness is increased and the flexibility is lost, when the inner side surface of the exterior is a cylindrical surface, the capacitor 11 can be curved along the inner side surface. The capacitor 11 can be arranged by effectively using the internal space of the device. Accordingly, in this embodiment, even when a large-capacity capacitor is provided, the electronic device can be made thin.

  The capacitor 11 is provided with terminals 18A and 18B of the anode electrode 16A and cathode electrode 16B on a surface parallel to the anode electrode 16A, and can be connected to a desired circuit block via the terminals 18A and 18B. Created on. Thereby, in the capacitor | condenser 11, after arrange | positioning inside the exterior of an apparatus, for example, it becomes possible to connect with a wiring board, and an assembly operation can be simplified (FIG. 3). In addition, in the case of being arranged inside the exterior of the device in this way, although it will be tinged to a certain extent with the dedicated parts specific to the device related to the mounting, if it is connected by the terminal in this way, for example The capacitor 11 is used in common between these devices even when the thickness of the gap with the wiring substrate is variously different by selecting the height of the terminal provided on the wiring substrate side according to the device. The versatility of the capacitor 11 can be improved. In addition, even when the capacitor 11 vibrates due to an impact from the outside of the case, the connection with the substrate can be ensured reliably, thereby improving the reliability.

  In this embodiment, the capacitor 11 is supplied with an adhesive and a release sheet provided on the surface where the electrodes 18A and 18B are not disposed. In the manufacturing process of the electronic still camera 1 (FIG. 3), after the release sheet is peeled off in the assembly process of the front case 10A, no electronic components are provided on the inner surface of the front case 10A, or on the case surface side. The capacitor 11 is pressed against the region, and the capacitor 11 is mounted on the case 10A. Thereafter, a wiring board 22 on which various electronic components 21 are mounted is incorporated in the case 10A, and at this time, a circuit in which the capacitor 11 is formed on the wiring board 22 by terminals 23A and 23B provided on the capacitor 11 side of the wiring board 22 at this time. Connected to the block (FIGS. 3 and 4). Further, the assembly is completed in combination with the rear case 10B which is assembled (FIG. 1).

  In the electronic still camera 1 (FIG. 5), the capacitor 11 is connected to a DC-DC converter 28 that is a driving circuit of the flash 4 and used to charge a power source for driving a flash that is a light emitter. In the still camera 1, even when a large-capacity capacitor for driving such a light emitter is mounted, the overall shape can be reduced. As a result, the electronic still camera 1 can be carried in various places and image a desired subject with a sufficient amount of light, for example, in the evening, at night, or indoors where light is insufficient.

  In addition, in a flash applied to a normal electronic still camera, the energy consumption during light emission is about 7.8 [Wsec], the arc length is about 13.5 [mm], and the minimum light emission voltage is 240 [V] or less. Applies. When such a flash 4 is caused to emit light at a rating, the capacitor 11 is required to have a capacity of 42 to 250 [μF] and a withstand voltage of 315 [V]. The capacitor 11 according to this embodiment can be made with a small thickness.

  In addition, by providing such a capacitor 11 inside the exterior, in the electronic still camera 1, it is expected that unnecessary radiation is reduced by the capacitor 11.

(3) Advantages of the embodiment According to the above configuration, the anode electrode and the cathode electrode are alternately laminated to form a capacitor with a flat plate shape, and along the inner side surface that is the exterior surface of the device. By arranging the lever capacitor, the electronic device can be thinned even when a large-capacity capacitor is provided.

  Further, by providing a terminal on the capacitor, and further connecting the capacitor to a corresponding circuit block by bringing the terminal of the wiring board into contact with the terminal, the assembling work can be simplified.

  In addition, since this capacitor is a capacitor that temporarily drives an electronic component by discharging the charged power, and since this electronic component is a light-emitting device, it is necessary to drive a light-emitting device or the like. Even when a capacitor having a capacitance is provided, the electronic device can be thinned.

  FIG. 6 is a connection diagram showing capacitors applied to the electronic still camera according to the second embodiment of the present invention together with corresponding circuit blocks. In this electronic still camera, a large-capacity capacitor 11 is mounted in the same manner as described above for the first embodiment, and this capacitor 11 is applied to the circuit block shown in FIG. The electronic still camera according to this embodiment is configured in the same manner as the electronic still camera according to the first embodiment except that the configuration according to FIG. 6 is different.

  That is, in this electronic still camera, the DC-DC converter 38 mounted on the wiring board 22 boosts the power supply of the battery 25 to generate a power supply with a desired voltage, and the capacitor 11 smoothes the power supply. Applied for.

  Even when a large-capacitance capacitor is provided for smoothing as in this embodiment, the same effect as in the first embodiment can be obtained.

  FIG. 7 is a connection diagram showing capacitors applied to the electronic still camera according to the third embodiment of the present invention together with corresponding circuit blocks. In this electronic still camera, a large-capacity capacitor 11 is mounted in the same manner as described above for the first embodiment, and this capacitor 11 is applied to the circuit block shown in FIG. The electronic still camera according to this embodiment is configured in the same manner as the electronic still camera according to the first embodiment except that the configuration according to FIG. 7 is different.

  That is, in this electronic still camera, the capacitor 11 is applied for power supply decoupling by the battery 25 input to the wiring board 22 to alleviate the power supply voltage drop caused by the instantaneous current.

  Even when a decoupling capacitor is applied as in this embodiment to reduce the power supply voltage drop due to the instantaneous current, the same effect as in the first embodiment can be obtained.

In the above-described embodiment, the case where the capacitor is connected to the substrate by the terminal having the V-shaped cross section is described. However, the present invention is not limited to this, and various shapes can be applied to the terminal shape. It is Ru can.

  In the above-described embodiments, the case where one capacitor is arranged on the inner surface of the exterior has been described. However, the present invention is not limited to this, and a plurality of capacitors are also provided side by side. May be. Further, in this case, as shown in FIG. 8 in comparison with FIGS. 6 and 7, two types of capacitors are integrated to form a composite capacitor 41, and this capacitor 41 is arranged on the inner surface of the exterior. May be.

  In the above-described embodiments, the case where the present invention is applied to an anode electrode formed by forming a dielectric film by an oxide film, electrolytic paper, and an electrolytic capacitor using a cathode electrode has been described. However, the present invention is not limited to this. For example, it can be widely applied to various electrolytic capacitors such as a capacitor using an electric double layer.

  In the above-described embodiments, the case where a capacitor is mounted for driving a flash has been described. However, the present invention is not limited to this. For example, power supplied by a USB (Universal Serial Bus) is primarily accumulated. Thus, the present invention can be widely applied when a large-capacity capacitor is mounted, for example, when an instantaneous current related to the startup of a hard disk is compensated.

  Further, in the above-described embodiments, the case where the capacitor is arranged by adhesion with an adhesive has been described. Various arrangement methods can be widely applied, for example, in a case where the arrangement is held in the case by means of, for example, or in the case where the arrangement is carried out by integral molding with the case.

  In the above-described embodiments, the case where the present invention is applied to an electronic still camera has been described. However, the present invention is not limited to this, and various portable electronic devices that are operated by a battery, such as a mobile phone, a PDA, and a video camera. Further, it can be widely applied to stationary electronic devices.

  The present invention can be applied to an electronic still camera, a mobile phone, a PDA, and the like.

It is a perspective view which shows the electronic still camera which concerns on Example 1 of this invention. It is a basic diagram with which it uses for description of the capacitor | condenser applied to the electronic still camera of FIG. It is sectional drawing with which it uses for description of the mounting method of the capacitor | condenser of FIG. It is the top view and side view with which it uses for description of the electrode of the capacitor | condenser of FIG. FIG. 3 is a connection diagram illustrating a peripheral circuit of the capacitor in FIG. 2. It is a connection diagram which shows the peripheral circuit of the capacitor | condenser applied to the electronic still camera which concerns on Example 2 of this invention. It is a connection diagram which shows the peripheral circuit of the capacitor | condenser applied to the electronic still camera which concerns on Example 3 of this invention. It is a connection diagram which shows the peripheral circuit of the capacitor | condenser applied to the electronic still camera which concerns on Example 4 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electronic still camera, 10A ... Front case, 10B ... Back case, 11, 41 ... Capacitor, 16A ... Electrode for anode, 16B ... Electrode for cathode, 18A, 18B, 23A, 23B ... Terminal , 22 …… Wiring board

Claims (6)

Case and
An anode electrode and cathode electrode are laminated alternately formed in a flat plate shape, having flexibility, each connected pair of pin is provided on the anode electrode and cathode electrode on one surface A capacitor having the other surface bonded to the inner surface of the case;
An electronic component is mounted on one surface of the case, a pair of contact terminals having elasticity is provided on the other surface, and the pair of contact terminals are provided on the one surface of the capacitor. An electronic device comprising: a wiring board that presses the pair of terminals and connects an electronic circuit of the electronic component to the capacitor . The electronic device according to claim 1, wherein the capacitor is a capacitor that reduces a drop in power supply voltage due to an instantaneous current of the electronic circuit. The electronic device according to claim 1, wherein the capacitor is a capacitor for smoothing a power supply voltage of the electronic circuit. The electronic device according to claim 1, wherein the capacitor is a capacitor that temporarily drives an electronic component constituting the electronic circuit by discharging charged power. The electronic device according to claim 4, wherein the electronic component is a light emitting element. The electrode for anode and the electrode for cathode are alternately laminated to form a flat plate shape, which is flexible and has a pair of terminals connected to the anode electrode and the cathode electrode on one surface. Bond the other side of the capacitor to the inner surface of the case,
A wiring board in which a desired electronic component is mounted on one surface and a pair of elastic contact terminals is provided on the other surface is disposed in the case.
A method of mounting a capacitor in an electronic device , wherein the pair of contact terminals having elasticity are pressed against the pair of terminals provided on the one surface of the capacitor to connect an electronic circuit of the electronic component to the capacitor.

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