JP2012190574A - Cover member for electronic apparatus and battery cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cover member for an electronic apparatus which protects the electronic apparatus against falling or collision and brings about high convenience to wireless charging, and to provide a battery cover.SOLUTION: A cover member 1 for an electronic apparatus 70 which covers the outside of the electronic apparatus 70 while opening an operation surface 71 side thereof comprises a tray 10 opening at least in the direction of the operation surface 71, and an elastic member 30 having a hardness lower than that of the tray 10 and covering at least the surface on the reverse side of the inner surface of the tray 10 on the opening side. The tray 10 or the elastic member 30 is provided with at least power reception components 50, 51 for wireless charging.

Description

  The present invention relates to an electronic device cover member and a battery lid.

  Recently, there are more and more opportunities to carry small electronic devices such as mobile phones, portable game devices, and e-books, and along with this, the opportunity to drop the small electronic devices or damage them by touching them while moving Is also increasing. One method of protecting a small electronic device from being damaged when it is dropped or brought into contact with something is a method of covering the small electronic device with a highly cushioned cover or case. For example, a cover for an electronic device is known in which only the operation surface of a small electronic device is opened and covered from the side surface to the back surface, and the opening portion is stretchable so that the small electronic device can be easily attached and detached. (See Patent Document 1). In addition, a container and a holder for a mobile phone made of a relatively hard material (plastic or metal) having an opening on the operation surface side of the mobile phone are also known (see Patent Document 2).

  On the other hand, recently, wireless charging, in which a secondary battery in an electronic device is charged without connecting the electronic device and a charger by wire, has attracted attention. Wireless charging methods include a conventional electromagnetic induction method, a magnetic resonance method in which power is supplied using resonance between coils (see, for example, Patent Document 3), and an electric field generated between electrodes. There is known an electric field coupling method (also referred to as a capacitance method) in which electric power is supplied using (see, for example, Patent Document 4).

  The electromagnetic induction method uses Faraday's law in which a magnetic field is generated on the coil side of the power receiving side and current flows when the coil on the power feeding side is brought close enough to change the magnetic field on the power feeding side coil. It is a charging method. The magnetic resonance method is common to the electromagnetic induction method in that power is supplied between the coils, but is different in that a resonance phenomenon between the coils is used. In the magnetic resonance method, the vibration of the magnetic field generated by the current flowing through the coil on the power feeding side is transmitted to the coil on the power receiving side that resonates at the same frequency, and the current flows through the coil on the power receiving side. The electric field coupling method is a method in which electrodes are installed on the power feeding side and the power receiving side, respectively, and energy is transmitted using an electric field generated between the electrodes. Compared to the electromagnetic induction method, the magnetic resonance method can supply power even when the power feeding unit and the power receiving unit are not close to each other. In the electric field coupling method, the power feeding unit and the power receiving unit are slightly offset in plan from the electromagnetic induction method. Recently, it has been particularly in the spotlight because it can supply power.

JP 2002-027076 A JP 2000-201210 A JP 2010-154700 A Special table 2009-531009

  However, when a protective cover is attached to the electronic device, the protective cover is interposed between the electronic device and the charger. For this reason, when performing the above-mentioned non-contact charge, the distance of an electronic device and a charger becomes large, and charge efficiency will fall. If the protective cover is removed from the electronic device and charged, the problem of a decrease in charging efficiency is less likely to occur, but the troublesomeness of removing the protective cover occurs every time the battery is charged. In addition, if there is a problem with a part of the power receiving component in the electronic device, there is also a problem that the entire electronic device must be repaired or replaced.

  The present invention has been made to solve such a problem, and provides a cover member for an electronic device and a battery lid that protects the electronic device from dropping or colliding and provides high convenience for wireless charging. Objective.

  In order to solve the above-described object, an aspect of the present invention is an electronic device cover member that opens an operation surface side of an electronic device and covers the outside of the electronic device, and includes a tray that opens at least in the direction of the operation surface. A cover member for an electronic device having a hardness lower than that of the tray and covering at least the surface opposite to the inner surface on the opening side of the tray, and having at least a power receiving component for wireless charging on the tray or the elastic member. .

  Further, another embodiment of the present invention is an electronic device cover member in which the power receiving component for wireless charging includes a coil.

  Another embodiment of the present invention is an electronic device cover member in which the coil further includes a power receiving resonance coil.

  Another embodiment of the present invention is a cover member for an electronic device further including a connection portion for electrically connecting the electronic device to the tray.

  Another embodiment of the present invention is a cover member for an electronic device that further includes a connection portion on an inner surface on the opening side of the bottom plate of the tray.

  One embodiment of the present invention is a battery lid in which any one of the above-described electronic device cover members also serves as a lid that covers the opening surface of the battery housing portion.

  ADVANTAGE OF THE INVENTION According to this invention, the cover member and battery cover for electronic devices which protect an electronic device from the fall and collision, and bring high convenience to wireless charging can be provided.

FIG. 1 is a perspective view of an electronic device cover member according to a first embodiment of the present invention as viewed from the opening surface side. FIG. 2 is a perspective view of the electronic device cover member shown in FIG. 1 as viewed from the side opposite to the opening surface. FIG. 3 is a plan view showing a configuration of a tray which is one of the constituent members of the electronic apparatus cover member shown in FIG. 4 is a plan view and a side view of the coil shown in FIG. FIG. 5 is a cross-sectional view taken along line AA around the coil of the tray shown in FIG. FIG. 6 is a perspective view showing a state where the electronic device cover member shown in FIG. 1 is attached to the electronic device. FIG. 7 is a perspective view of the electronic device cover member according to the second embodiment of the present invention as viewed from the opening side. FIG. 8 is an enlarged view of the thin coil shown in FIG. 9 is a cross-sectional view of the thin coil shown in FIG. 8 taken along line BB. FIG. 10 is a perspective view of a coil provided in a tray constituting a cover member for an electronic device according to a third embodiment of the present invention. FIG. 11 is an example of a circuit configuration for charging a secondary battery of an electronic device from a charger through a cover member for the electronic device by an electromagnetic induction method. FIG. 12 illustrates an example of a circuit configuration that is partly different from the circuit illustrated in FIG. FIG. 13: is the perspective view which looked at the cover member for electronic devices which concerns on the 4th Embodiment of this invention from the opening side. FIG. 14 is a cross-sectional view of the electronic device cover member shown in FIG. FIG. 15 is an example of a circuit configuration for charging a secondary battery of an electronic device from a charger through a cover member for the electronic device by a magnetic resonance method. FIG. 16: is the perspective view which looked at the cover member for electronic devices which concerns on the 5th Embodiment of this invention from the opening side. FIG. 17 is a perspective view of the electronic device cover member shown in FIG. 16 as viewed from the side opposite to the opening surface of the tray. FIG. 18 shows an example of a circuit configuration for charging a secondary battery of an electronic device from the charger through the electronic device cover member by the electric field coupling method.

  Next, embodiments of the electronic device cover member and the battery cover according to the present invention will be described with reference to the drawings.

<1. Form equipped with electromagnetic charging wireless charging function>
(1) First Embodiment FIG. 1 is a perspective view of an electronic device cover member according to a first embodiment of the present invention as viewed from the opening surface side. FIG. 2 is a perspective view of the electronic device cover member shown in FIG. 1 as viewed from the side opposite to the opening surface. FIG. 3 is a plan view showing a configuration of a tray which is one of the constituent members of the electronic apparatus cover member shown in FIG. 4 is a plan view and a side view of the coil shown in FIG. FIG. 5 is a cross-sectional view taken along line AA around the coil of the tray shown in FIG. FIG. 6 is a perspective view showing a state where the electronic device cover member shown in FIG. 1 is attached to the electronic device.

  The electronic device cover member 1 (hereinafter simply referred to as “cover member”) 1 according to the first embodiment opens the operation surface 71 side of the electronic device 70 to cover the outside of the electronic device 70, The tray 10 is opened at least in the direction of the operation surface 71, and the elastic member 30 is lower in hardness than the tray 10 and covers at least the surface opposite to the opening-side inner surface of the tray 10.

  As shown in FIGS. 1 and 2, the tray 10 is configured by connecting a bottom plate 11 located on the back side of the electronic device 70 and a side wall 12 extending from the bottom plate 11 toward the outer surface of the electronic device 70. It is a member. The side wall 12 sufficiently covers a pair of side surfaces of the electronic device 70, in this embodiment, both side surfaces on the short side, while the other pair of side surfaces, in this embodiment, both side surfaces on the long side are greatly cut out. Have a shape. The tray 10 has through-holes 15, 16, 17, and 12 in the bottom plate 11 and the side wall 12 according to the positions of switches, connection ports, camera lenses, and the like, which are examples of external access units provided on the side surface and bottom surface of the electronic device 70. 19 is provided. Here, the “external access part” refers to a part that is accessible from either one between the outside of the cover member 1 and the electronic device 70. Access methods include not only direct contact but also light and sound input / output.

  The tray 10 is preferably made of a resin, more preferably a thermoplastic resin, a thermosetting resin, an ultraviolet curable resin, or an electron beam curable resin, and particularly preferably a polycarbonate resin or a polyester. It consists of a series resin or a polyamide series resin. The thickness of the bottom plate 11 and the side wall 12 of the tray 10 can be designed to an appropriate thickness depending on the size and weight of the electronic device 70. For example, when the thickness of the electronic device 70 is in the range of 8 to 20 mm, the short side is 50 to 200 mm, and the long side is 80 to 300 mm, the bottom plate 11 and the side wall 12 of the resin tray 10 are at the thickest part. It can be designed in the range of 0.4 to 1.4 mm, more preferably 0.4 to 1.0 mm.

  The tray 10 includes one regulation plate 21 that is erected toward the electronic device 70 on each of the two side walls 12 having a cut-out portion on the long side of the electronic device 70. The restriction plate 21 is a part for ensuring the fixation between the tray 10 inside the cover member 1 and the outer surface of the electronic device 70 and preventing the electronic device 70 from easily falling off the cover member 1. The restriction plate 21 may be formed not on the side wall 12 on the long side of the tray 10 but on the long side of the bottom plate 11.

  As shown in FIGS. 1 to 3, the tray 10 has a connection part 50 that can be electrically connected to an electronic device 70 as a power receiving component for wireless charging, and a connection part 50 that is electrically connected to the bottom plate 11. And a coil 51 to be connected. The connection portion 50 is erected on the inner surface of the bottom plate 11 and is configured to be easily connected to a connection recess (not shown) on the electronic device 70 side when the electronic device 70 is fitted into the cover member 1. The connection unit 50 preferably has, for example, a form such as a connection plug connected to a coaxial cable, and can be plugged into the plug connection port on the electronic device 70 side, but is limited to that form. Not. Further, the connecting portion 50 is not limited to the bottom plate 11 of the tray 10 and may be disposed on the side wall 12.

  The coil 51 has a form in which a metal wire is covered with an insulating film, and an electrical short circuit does not occur even if the coils 51 contact each other. The coil 51 is preferably provided inward in the thickness direction of the bottom plate 11 with the ring surface facing the front and back directions of the bottom plate 11. As shown in FIGS. 3 and 5, the bottom plate 11 includes two concave portions 22 and 23 that are recessed in the thickness direction on the inner surface side. The recess 22 is a ring-shaped recess for fitting the winding portion 52 of the coil 51. On the other hand, the concave portion 23 is a line-shaped concave portion for arranging the two end portions 53a and 53b (53 in the case of generalization) of the coil 51. The recess 22 is formed deeper than the recess 23. The coil 51 is fitted into recesses 22 and 23 formed on the inner surface side of the bottom plate 11 of the tray 10. The openings of the recesses 22 and 23 are covered with a resin film 60. This is to prevent the electronic device 70 and the coil 51 from contacting each other, thereby protecting the coil 51 and preventing the frame of the electronic device 70 from being damaged. On the other hand, the connection part 50 is not covered with the film 60 but exposed. In addition, when forming the recessed parts 22 and 23 more deeply, or forming so that the coil 51 may be hard to damage, the film 60 is not necessarily required. Further, the coil 51 may be provided so as to be exposed not on the opening-side inner surface of the bottom plate 11 of the tray 10 but on the back-side surface thereof, or completely embedded in the bottom plate 11. Further, the coil 51 may be provided on the side wall 12. In addition, the coil 51 may be fixed to the surface of the elastic member 30 on the tray 10 side or the opposite surface thereof instead of the tray 10 or may be completely embedded in the elastic member 30.

  The elastic member 30 includes a bottom plate 31 located on the back side of the electronic device 70, a side wall 32 that covers the outer surface of the electronic device 70 from the bottom plate 31, and an operation surface side that covers the outer edge of the operation surface 71 of the electronic device 70 from the side wall 32. It is a member having a boat shape configured to be connected to the outer edge portion 33. The elastic member 30 is preferably configured from a thermoplastic elastomer, a thermosetting elastomer, or the like, and is particularly preferably configured from, for example, a urethane-based or silicone-based elastomer. When the thickest portions of the bottom plate 11 and the side wall 12 of the tray 10 are in the range of 0.4 to 1.4 mm, more preferably in the range of 0.4 to 1.0 mm, the bottom plate 31 and the side wall 32 of the elastic member 30 made of the elastomer. Can be designed in the range of 0.4 to 1.4 mm, more preferably in the range of 0.4 to 1.0 mm at the thickest part. The elastic member 30 is formed on the bottom plate 31 and the side wall 32 in accordance with the positions of the switch, connection port, camera lens, and the like provided on the side surface and the bottom surface of the electronic device 70, and the convex covering portion 34 and the through holes 35, 36, and 37. , 38, 39. The convex covering portion 34 is preferably formed to be thinner than other portions so that the electronic device 70 can be touched and operated from the cover member 1. The through holes 35, 36, 37, 38, and 39 are portions formed so as to be in contact with the electronic device 70 therethrough or allow light to pass therethrough. The size, shape, position, and number of the convex covering portion 34 and the through holes 35, 36, 37, 38, 39 vary depending on the form of the electronic device 70.

  The side wall 32 of the elastic member 30 is formed to be higher than the height of the side wall 12 of the tray 10. Even at the highest position in the side wall 12 of the tray 10, the position is in contact with the inner side of the operation surface side outer edge portion 33 of the elastic member 30. Thereby, at least the operation surface side outer edge portion 33 becomes a portion not in contact with the tray 10 and can be freely deformed when being attached to or detached from the electronic device 70. The through holes 35, 36, 37, 39 of the elastic member 30 are formed at substantially the same shape and size at the same positions as the through holes 15, 16, 17, 19 of the tray 10. The elastic member 30 completely covers each outer side of the bottom plate 11 and the side wall 12 of the tray 10, while exposing a part of the inner side without completely covering the inner side thereof. The elastic member 30 preferably covers part or all of at least one of the inner peripheral surfaces of the through holes 15, 16, 17, and 19 of the tray 10. However, the inner peripheral surfaces of the through holes 15, 16, 17, 19 may not be covered with the elastic member 30.

  The cover member 1 according to this embodiment also functions as a battery lid 1 ′ when attached to the electronic device 70 in a state where a secondary battery is put in the battery housing portion of the electronic device 70. For this reason, in addition to the cover member 1, the electronic device 70 does not require another lid for preventing the secondary battery from dropping off. However, it is not essential that the cover member 1 also serves as the battery lid 1 '. The battery housing part of the electronic device 70 may be provided with a dedicated battery lid, and the cover member 1 may be attached from above. The point that the cover member 1 can also serve as the battery lid 1 ′ is the same in the following embodiments.

(2) Second Embodiment Next, an electronic device cover member according to a second embodiment of the present invention will be described. The components common to the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 7 is a perspective view of the electronic device cover member according to the second embodiment of the present invention as viewed from the opening side. FIG. 8 is an enlarged view of the thin coil shown in FIG. 9 is a cross-sectional view of the thin coil shown in FIG. 8 taken along line BB.

  As shown in FIG. 7, the tray 10 can also include a thin coil 81 thinner than the coil 51 shown in FIG. 4 on the inner surface of the bottom plate 11 as a power receiving component for wireless charging. The thin coil 81 is preferably formed on the inner surface of the bottom plate 11 of the tray 10 by a technique such as metal vapor deposition, printing using ink containing metal powder, or attaching metal foil. The thickness of the thin coil 81 can be preferably set to 100 μm or less, for example. The thin coil 81 includes a winding portion 82 concentrically wound from the outside to the inside, and two end portions 83a and 83b (83 in the case of generalization). Unlike the coil 51 shown in FIG. 4, the thin coil 81 does not cover the coil wire with an insulating film. Therefore, as one method for preventing a short circuit between the end portion 83b (or the end portion 83a) and the winding portion 82, the end portion 83b is provided on the winding portion 82 via an insulating member 84 as shown in FIG. Crossed in three dimensions. The insulating member 84 can be formed by using an ink containing a pigment having a high insulating property and printing over the part of the winding portion 82. However, the insulating member 84 can also be formed by a technique such as attaching an insulating sheet or applying a highly insulating adhesive without using printing. Alternatively, a metal wire may be embedded in the bottom plate 11, and the inner end 83b of the winding portion 82 may be embedded toward the metal wire in the bottom plate 11 to be electrically connected to the metal wire.

  Although the cover member 1 shown in FIG. 7 does not include a film covering the thin coil 81, the thin coil 81 is damaged by the contact between the thin coil 81 and the electronic device 70 as in the case of the cover member 1 shown in FIG. In order to avoid this, a film may be attached on the thin coil 81. In that case, the connection part 50 is made not to be covered with a film from the necessity of electrical connection with the electronic device 70. The thin coil 81 may be provided so as to be exposed not on the opening-side inner surface of the bottom plate 11 of the tray 10 but on the back-side surface thereof, or completely embedded in the bottom plate 11. Further, the thin coil 81 may be provided on the side wall 12. Further, the thin coil 81 may be fixed to the surface of the elastic member 30 on the tray 10 side or the opposite surface thereof instead of the tray 10 or may be completely embedded in the elastic member 30.

(3) Third Embodiment FIG. 10 is a perspective view of a coil provided in a tray constituting a cover member for an electronic device according to a third embodiment of the present invention.

  The coil for wireless charging may include not only the inner surface of the bottom plate 11 of the tray 10 and the coil surface in parallel, but also the coil length direction parallel to the inner surface. A coil 91 shown in FIG. 10 is wound around a thin plate region 90a located substantially at the center of a core 90 made of a magnetic material. Both ends 90b, 90b of the core 90 serve as a magnetic flux input / output region from a primary coil (not shown) provided on the charger side. That is, the core 90 constitutes a part of a closed magnetic path through which the primary coil on the charger side and the magnetic flux in the coil 91 pass. Both the core 90 and the coil 91 are power receiving components for wireless charging. By winding the coil 91 around the core 90, the magnetic permeability can be improved. The magnetic material corresponding to the core 90 may be disposed in the coil 51 or the thin coil 81 in the above-described embodiments. The core 90 and the coil 91 may be provided so as to be exposed on the inner surface on the opening side of the bottom plate 11 of the tray 10, the surface on the back side thereof, or completely embedded in the bottom plate 11. Further, the core 90 and the coil 91 may be provided on the side wall 12. Further, the core 90 and the coil 91 may be fixed to the surface of the elastic member 30 on the tray 10 side or the opposite surface thereof instead of the tray 10 or may be completely embedded in the elastic member 30.

(4) Configuration of charging circuit (common to the first to third embodiments)
FIG. 11 is an example of a circuit configuration for charging a secondary battery of an electronic device from a charger through a cover member for the electronic device by an electromagnetic induction method.

  The power supply circuit on the charger 100 side includes a rectifying / smoothing circuit 101, a resonance circuit 102, a primary coil 103, a capacitor 104, and the like. As described above, the cover member 1 includes the coil 51, the thin coil 81, or the coil 91 (secondary coils 51, 81, 91). The power receiving circuit on the electronic device 70 side includes a capacitor 109, a rectifier circuit 110, a charge control circuit 111, and a secondary battery 120. The power receiving circuit includes both circuits in the cover member 1 and the electronic device 70. The capacitor 109 may be arranged on the cover member 1 side. Further, at least one of the rectifier circuit 110 and the charge control circuit 111 may be disposed on the cover member 1.

  The rectifying / smoothing circuit 101 rectifies alternating current from a commercial power supply (alternating current power supply) with a rectifying circuit using a diode, smoothes it with a smoothing circuit, and converts it into direct current. The resonance circuit 102 oscillates at a high frequency, and as a result, a magnetic field is generated around the primary coil 103 constituting the LC circuit. The magnetic flux generated by the magnetic field passes through the secondary coils 51, 81, 91 of the cover member 1, and current is induced in the secondary coils 51, 81, 91 by electromagnetic induction. The alternating current flowing through the LC circuit composed of the secondary coils 51, 81, 91 and the capacitor 109 is converted into direct current by the rectifier circuit 110. The charging control circuit 111 supplies direct current to the secondary battery 120 and the secondary battery 120 is charged. When the predetermined charging is completed, the charging control circuit 111 stops the charging.

  FIG. 12 illustrates an example of a circuit configuration that is partly different from the circuit illustrated in FIG.

  As shown in FIG. 12, on the electronic device 70 side, a switching circuit 130 that enables switching of the secondary coil 131, the capacitor 132, and the secondary coils 51, 81, 91, etc. on the cover member 1 side, The secondary battery 120 in the electronic device 70 can be charged regardless of the presence or absence of the cover member 1. When the cover member 1 and the electronic device 70 are connected via the connection unit 50, the switching circuit 130 connects the secondary coils 51, 81, and 91 to the power receiving circuit. In this case, the secondary coil 131 is disconnected from the charging circuit. On the other hand, when the cover member 1 is removed from the electronic device 70, the secondary coil 131 and the power receiving circuit are connected. With such a circuit configuration, the secondary battery 120 can be charged regardless of the presence or absence of the cover member 1.

(5) Manufacturing Method of Electronic Device Cover Member The tray 10 is formed by, for example, an injection molding method in which a molten resin is injected into a mold and molding, or a molding method in which a softened plate-shaped resin is clamped in the mold. Can be suitably manufactured. In the case of the latter molding method, a method of reducing the pressure from one mold side, a method of supplying high-pressure gas from the one mold side, or a method of combining the pressure reduction and the air supply may be used. For example, the elastic member 30 sets the molded tray 10 in a mold, supplies a composition capable of forming the elastic member 30 to the gap between the mold and the tray 10, and crosslinks the composition. It can be formed by a method or the like. When such a molding method is used, the tray 10 and the elastic member 30 can be easily integrated. In order to enhance the adhesion between the tray 10 and the elastic member 30, the elastic member 30 is configured by applying a primer to the adhesion region between the molded tray 10 and the elastic member 30 and then setting the primer. The composition may be supplied into the mold. After integrating the tray 10 and the elastic member 30, in the case of the cover member 1 according to the first embodiment, on the inner surface side of the bottom plate 11 of the tray 10, the connection portion 50 and the coil 51, which are power receiving components, and further A film 60 is provided. In the case of the cover member 1 according to the second embodiment, the connection portion 50 and the thin coil 81 that are power receiving components are provided on the inner surface side of the bottom plate 11 of the tray 10. In the case of the cover member 1 according to the third embodiment, the connection portion 50, the core 90, and the coil 91, which are power receiving components, are provided on the inner surface side of the bottom plate 11 of the tray 10. In any embodiment, part or all of the above components are attached to the inner surface of the bottom plate 11 of the tray 10 after the tray 10 is molded, and the elastic member 30 and the tray 10 are integrally molded. It can also be done before.

  Next, a preferred manufacturing method for manufacturing the cover member 1 by the two-color molding method using polycarbonate resin as the material of the tray 10 and silicone elastomer as the material of the elastic member 30 will be described.

  First, a molten polycarbonate resin is injected into a mold capable of shaping the tray 10. Thereafter, when the mold is opened, the tray 10 having the shape shown in FIG. 3 is obtained. Next, a primer is applied to the outer surface of the tray 10 and dried. Next, the tray 10 coated with the primer is set in another mold capable of shaping the cover member 1, and a molten silicone composition (manufactured by Shin-Etsu Chemical Co., Ltd., product number: KE-2090-40A / B). After the silicone composition is crosslinked, the mold is opened to obtain the cover member 1 including the tray 10 and the elastic member 30. When it is necessary to color or decorate the tray 10, prior to integral molding with the elastic member 30, the tray 10 is dipped into the paint, the paint is applied by spraying, printing, or a decorative sheet May be affixed. Further, when it is necessary to decorate the outer surface of the elastic member 30, after the integral molding with the tray 10, a paint may be applied to the outer surface by spraying, printed, or a decorative sheet may be attached. . The elastic member 30 may be decorated by kneading the pigment in a molten polycarbonate resin in advance. Thereafter, on the inner surface of the bottom plate 11 of the tray 10, components necessary for wireless charging such as a power receiving component (connection portion 50, coil 51 and film 60; connection portion 50 and thin coil 81; or connection portion 50, core 90 and coil 91. ).

<2. Form with magnetic resonance wireless charging function>
Fourth Embodiment Next, an electronic device cover member according to a fourth embodiment of the present invention will be described. The components common to the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

(1) Configuration of Electronic Device Cover Member FIG. 13 is a perspective view of the electronic device cover member according to the fourth embodiment of the present invention as viewed from the opening side. FIG. 14 is a cross-sectional view of the electronic device cover member shown in FIG.

  In this embodiment, the tray 10 is connected to the bottom plate 11 as a power receiving component for wireless charging, a connection portion 140 that can be electrically connected to the electronic device 70, and a power reception that is electrically connected to the connection portion 140. The coil 141 and the power receiving side resonance coil 151 as a resonance coil electrically connected with the said connection part 140 are provided. The power reception side resonance coil 151 is a coil which receives supply of electric power from the charger side by generating resonance with a power supply side resonance coil provided on the charger side. The power receiving coil 141 is a coil that receives magnetic flux energy from the power receiving resonance coil 151 by electromagnetic induction. The cover member 1 according to this embodiment is different from the cover member 1 according to each of the first to third embodiments in that the power receiving-side resonance coil 151 is provided. By arranging the power receiving side resonance coil 151 on the power receiving side and the power feeding side resonance coil on the power feeding side so as to receive energy between both resonance coils, the distance between the cover member 1 and the charger is relatively small. High efficiency charging is possible even when away from each other.

  The connecting portion 140 is erected on the inner surface of the bottom plate 11 and can be connected to a connecting recess (not shown) on the electronic device 70 side when the electronic device 70 is fitted into the cover member 1. The connecting portion 140 is not limited to the bottom plate 11 of the tray 10 and may be disposed on the side wall 12. The power receiving coil 141 is a substantially one-turn coil composed of only a metal film. The power receiving coil 141 is preferably formed on the inner surface of the bottom plate 11 of the tray 10 by a technique such as metal vapor deposition, printing using ink containing metal powder, or attaching metal foil. The thickness of the power receiving coil 141 can be suitably set to 100 μm or less, for example. However, the power receiving coil 141 is not necessarily composed of only a metal film, and may be a coil in which a metal wire is covered with an insulating film. The opening shape of the power receiving coil 141 may be a shape other than a rectangle such as a circle or an ellipse.

  The power receiving side resonance coil 151 is a coil in which a metal wire is covered with an insulating film and has a larger number of turns than the power receiving coil 141 (for example, the number of turns: 5 to 7). There is no electrical short circuit. The power receiving resonance coil 151 is a coil having an opening area smaller than that of the power receiving coil 141 described above, but may be a coil having the same or larger opening area as the power receiving coil 141. As shown in FIGS. 13 and 14, the tray 10 includes two concave portions 22 and 23 that are recessed in the thickness direction on the inner surface side of the bottom plate 11. The concave portion 22 is a ring-shaped concave portion for fitting the winding portion 152 of the power receiving side resonance coil 151. On the other hand, the concave portion 23 is a line-shaped concave portion for arranging the two end portions 153a and 153b (in the case of summarizing, 153) of the power receiving side resonance coil 151. The recess 22 is formed deeper than the recess 23. The power receiving side resonance coil 151 is fitted into the recesses 22 and 23 formed on the inner surface side of the bottom plate 11. The power receiving coil 141 and the power receiving side resonance coil 151 may be provided so as to be exposed not on the opening side inner surface of the bottom plate 11 of the tray 10 but on the back side surface thereof or completely embedded in the bottom plate 11. Further, the power receiving coil 141 and the power receiving side resonance coil 151 may be provided on the side wall 12. Further, the power receiving coil 141 and the power receiving resonance coil 151 are not fixed to the tray 10 but to the surface of the elastic member 30 on the tray 10 side or the opposite surface, or are completely embedded in the elastic member 30. Also good.

(2) Configuration of Charging Circuit FIG. 15 is an example of a circuit configuration for charging a secondary battery of an electronic device from a charger through a cover member for the electronic device by a magnetic resonance method.

  The power supply circuit on the charger 100 side includes a rectifying / smoothing circuit 101, a resonance circuit 102, a power supply coil 161, a capacitor 162, a power supply side resonance coil 171 and a capacitor 172. The feeding coil 161 and the capacitor 162 constitute an LC circuit. Similarly, the power supply resonance coil 171 and the capacitor 172 also constitute an LC circuit. Since the feeding coil 161 and the feeding-side resonance coil 171 need to efficiently supply magnetic flux energy from the feeding coil 161 to the feeding-side resonance coil 171 by electromagnetic induction, the opening surfaces of the feeding coil 161 and the feeding-side resonance coil 171 face each other as much as possible. It is preferably arranged in a non-contact state so as to be narrow.

  The cover member 1 includes the power receiving coil 141 and the power receiving side resonance coil 151 as described above. Since the power receiving coil 141 and the power receiving resonance coil 151 need to efficiently supply magnetic flux energy from the power receiving resonance coil 151 to the power receiving coil 141 by electromagnetic induction, the opening surfaces of the power receiving coil 141 and the power receiving resonance coil 151 are opposed to each other as much as possible. It is preferably arranged in a non-contact state so as to be narrow. The power reception resonance coil 151 is a coil having the same resonance frequency as that of the power supply resonance coil 171 because it is necessary to receive energy from the power supply resonance coil 171 due to a magnetic resonance phenomenon.

  The power receiving circuit on the electronic device 70 side receives the AC from the capacitor 142 constituting the LC circuit with the power receiving coil 141, the capacitor 155 constituting the LC circuit with the power receiving side resonance coil 151, and the power receiving coil 141. A rectifier circuit 110 that performs rectification, a charge control circuit 111 that controls charging, and a secondary battery 120 are included. The power receiving circuit includes both circuits in the cover member 1 and the electronic device 70. Note that at least one of the capacitor 142 and the capacitor 155 may be disposed on the cover member 1 side. Further, at least one of the rectifier circuit 110 and the charge control circuit 111 may be disposed on the cover member 1.

  The functions of the rectifying / smoothing circuit 101 and the resonance circuit 102 are common to the functions described above with reference to FIG. As a result of the magnetic flux generated around the power supply coil 161 passing through the power supply side resonance coil 171, a current is induced in the power supply side resonance coil 171 by electromagnetic induction. The power receiving resonance coil 151 resonates with the power supply resonance coil 171 and receives energy from the power supply resonance coil 171. As a result of the magnetic flux generated around the power receiving resonance coil 151 passing through the power receiving coil 141, a current is induced in the power receiving coil 141 by electromagnetic induction. The alternating current flowing through the LC circuit composed of the power receiving coil 141 and the capacitor 142 is converted into direct current by the rectifier circuit 110. The charging control circuit 111 supplies direct current to the secondary battery 120 and the secondary battery 120 is charged. When the predetermined charging is completed, the charging control circuit 111 stops the charging.

  In the fourth embodiment, the power receiving coil 141 and the power receiving resonance coil 151 are disposed in the cover member 1, but either one of the coils 141 and 151 may be disposed in the electronic device 70. good. Further, as described based on FIG. 12, the electronic device 70 further includes another set of the power receiving coil 141 and the power receiving side resonance coil 151 and a switching circuit similar to the switching circuit 130, You may make it the structure in which wireless charging is possible irrespective of the presence or absence.

(3) Manufacturing Method of Electronic Device Cover Member The two-color molding of the tray 10 and the elastic member 30 is common to the manufacturing methods described in the first to third embodiments. Thereafter, components (connection portion 140, power reception coil 141, and power reception side resonance coil 151) necessary for wireless charging such as power reception components are attached to the inner surface of bottom plate 11 of tray 10.

<3. Form with electric field coupling type wireless charging function>
Fifth Embodiment Next, an electronic device cover member according to a fifth embodiment of the present invention will be described. The components common to the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

(1) Configuration of Electronic Device Cover Member FIG. 16 is a perspective view of an electronic device cover member according to the fifth embodiment of the present invention as viewed from the opening side. FIG. 17 is a perspective view of the electronic device cover member shown in FIG. 16 as viewed from the side opposite to the opening surface of the tray.

  In this embodiment, the tray 10 has, as a power receiving component for wireless charging, a connection portion 50 that can be electrically connected to the electronic device 70 and a circuit that is electrically connected to the connection portion 50. A substrate 190 and a first electrode 180 electrically connected to the circuit substrate 190 are provided. The first electrode 180 and the circuit board 190 are connected by a wiring 181. The connection unit 50 and the circuit board 190 are connected by a wiring 191. As shown in FIG. 17, the connection portion 50 is exposed from the opening-side inner surface of the bottom plate 11 of the tray 10 because it is necessary to connect to the electronic device 70. On the other hand, the first electrode 180 and the wirings 181 and 191 are provided so as to be exposed on a surface (back surface) opposite to the opening-side inner surface of the bottom plate 11. The tray 10 includes a through hole 25 in the vicinity of the connection portion 50 and a through hole 28 in the side wall 12 to which the circuit board 190 is attached. The wiring 191 connects the connection portion 50 and the circuit board 190 through the through hole 25. The circuit board 190 is fitted into the through hole 28 and fixed to the side wall 12 using an adhesive or the like.

  The circuit board 190 may be fixed by fitting without using an adhesive. Further, the circuit board 190 is not limited to the side wall 12 and may be fixed to the bottom plate 11. For example, the circuit board 190 and the connection unit 50 may be a single connection unit. In that case, the wiring 191 is unnecessary. The first electrode 180 may be provided not on the back surface of the tray 10 but on the inner surface of the opening or embedded in the bottom plate 11. Further, the first electrode 180 may be provided on the elastic member 30 instead of the tray 10. In that case, the first electrode 180 may be fixed to the surface of the elastic member 30 on the tray 10 side or the opposite surface, or may be embedded in the elastic member 30. Although the 1st electrode 180 is arrange | positioned in the approximate center of the baseplate 11 of the tray 10, it is not limited to this place, As long as arrangement | positioning is possible, it may be arrange | positioned in any place of the tray 10. FIG.

(2) Configuration of Charging Circuit FIG. 18 is an example of a circuit configuration for charging a secondary battery of an electronic device from a charger through an electronic device cover member by an electric field coupling method.

  The power supply circuit on the charger 100 side includes a modulation circuit 200, a step-up / stabilization circuit 201, and a second electrode 210. The cover member 1 includes the first electrode 180, the wiring 181, the circuit board 190, and the wiring 191 as described above. The circuit board 190 includes a step-down / stable circuit 220 and a third electrode 221. The power receiving circuit on the electronic device 70 side includes a rectifier circuit 230, a charge control circuit 231, and the secondary battery 120. The power receiving circuit includes both circuits in the cover member 1 and the electronic device 70. Note that at least one of the rectifier circuit 230 and the charge control circuit 231 may be disposed on the cover member 1.

  The modulation circuit 200 modulates an AC frequency from a commercial power supply (AC power supply) and oscillates at a high frequency. The boost / stable circuit 201 includes a plurality of coils and boosts the voltage to a high voltage (for example, 2400 V). As a result, a high voltage is generated at the second electrode 210 at one end of the circuit separated in the booster / stable circuit 201. As a result, a high voltage is generated on the first electrode 180 side. The step-down / stable circuit 220 includes a plurality of coils, and sends the stepped-down power to the electronic device 70 side (for example, 12V). In the step-down / stable circuit 220, a plurality of coils are opposed to each other and are directed to the first electrode 180, the coil, and the third electrode 221, and the rectifier circuit 230 and the charging control circuit 231 in the electronic device 70 from another coil. The circuit including the secondary battery 120 is separated. The alternating current that has been stepped down by the step-down / stabilizing circuit 190 is converted into direct current by the rectifier circuit 230. The charging control circuit 231 supplies direct current to the secondary battery 120, and the secondary battery 120 is charged. When the predetermined charging is completed, the charging control circuit 231 stops charging.

  Also in the fifth embodiment, as described with reference to FIG. 12 described above, another set of the first electrode 180 and the circuit board 190 and a switching circuit similar to the switching circuit 130 are provided in the electronic device 70. The wireless charging may be performed regardless of the presence or absence of the cover member 1.

(3) Manufacturing Method of Electronic Device Cover Member The two-color molding of the tray 10 and the elastic member 30 is common to the manufacturing methods described in the first to third embodiments. Thereafter, components (connection portion 50, first electrode 180, wiring 181, circuit board 190, and wiring 191) necessary for wireless charging such as power receiving components are attached to the inner surface of bottom plate 11 of tray 10.

<Other embodiments>
The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. .

  For example, depending on the positions of buttons, speakers, camera lenses, and the like of the electronic device 70, the tray 10 may be provided with a notch instead of the through hole 16 or the like. The elastic member 30 does not necessarily have to have the side wall 32 formed higher than the height of the side wall 12 of the tray 10. Further, the elastic member 30 may not necessarily include the operation surface side outer edge portion 33 that is connected from the side wall 32 and covers a part or all of the outer edge of the operation surface 71 of the electronic device 70. The elastic member 30 may not cover the opposite surface of the tray 10 more widely than the inner surface on the opening side. Further, the elastic member 30 may cover a part of the inner surface on the opening side of the tray 10 more widely or expose the surface on the opposite side to the inner surface on the opening side of the tray 10 as compared with the first embodiment. good. In contrast, the elastic member 30 exposes a part of the inner surface on the opening side of the tray 10 more than the first embodiment, or more on the surface opposite to the inner surface on the opening side of the tray 10. It may be covered widely. In addition, the tray 10 and the elastic member 30 are preferably in close contact with each other, but there may be a region that is not in close contact. The tray 10 may open not only the operation surface 71 side of the electronic device 70 but also one of the side walls 12. In that case, when the connection portions 50 and 140 are provided on the inner surface of the side wall 12 opposite to the opening, the electronic device 70 is inserted from the opening and the electronic device 70 is attached to the cover member 1. 140 can be connected to the electronic device 70.

  The electrical connection between the electronic device 70 and the cover member 1 is realized via the connection portions 50 and 140, but the connection between the electronic device 70 and the cover member 1 is not provided without the connection portions 50 and 140. You may connect wirelessly.

  The present invention can be used as a protective cover that enables wireless charging of an electronic device.

1 Cover member (Cover member for electronic equipment)
1 'battery cover 10 tray 11 bottom plate 30 elastic member 50 connection part (one of the power receiving components for wireless charging)
51 Coil (one of the power receiving parts for wireless charging)
70 Electronic equipment 71 Operation surface 81 Thin coil (one of power receiving parts for wireless charging)
90 core (one of the power receiving parts for wireless charging)
91 Coil (one of the power receiving parts for wireless charging)
140 connecting portion 141 power receiving coil (one of power receiving components for wireless charging)
151 Receiving side resonance coil (resonance coil, one of power receiving parts for wireless charging)
180 First electrode (one of the power receiving parts for wireless charging)
181 Wiring (one of the power receiving parts for wireless charging)
190 Circuit board (One of the power receiving parts for wireless charging)
191 Wiring (one of the power receiving parts for wireless charging)

Claims (6)

An electronic device cover member that opens the operation surface side of the electronic device and covers the outside of the electronic device,
A tray that opens at least in the direction of the operation surface;
An elastic member that is lower in hardness than the tray and covers at least the surface on the opposite side of the inner surface on the opening side of the tray;
With
An electronic apparatus cover member comprising at least a power receiving component for wireless charging on the tray or the elastic member.   The electronic device cover member according to claim 1, wherein the power receiving component for wireless charging includes a coil.   The electronic device cover member according to claim 2, wherein the coil includes a power reception resonance coil.   The electronic device cover member according to any one of claims 1 to 3, wherein the tray includes a connection portion for electrical connection with the electronic device.   The electronic device cover member according to claim 4, wherein the connection portion is provided on an inner surface on the opening side of the bottom plate of the tray.   6. A battery cover, wherein the electronic device cover member according to claim 1 also serves as a cover that covers an opening surface of the battery storage unit.

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