JP6555008B2 - Electronic device having a cap that can be attached to a housing - Google Patents

Description

  The present invention relates to an electronic device having a cap that can be attached to a housing.

  In many cases, a small electronic device such as a mobile phone terminal includes a connector for connecting various cables or a small IC card. The connector includes a USB connector for connecting a USB cable, a card connector for connecting a SIM card or a memory card, and the like. The connector includes an insertion hole formed in the side surface of the housing so as to receive a terminal portion such as a cable or an IC card, and a terminal portion on the housing side installed at the bottom of the insertion hole. In many cases, an electronic device having the above connector includes a detachable lid that prevents foreign matter such as water droplets and dust from entering the insertion hole when a cable or an IC card is not connected. Such a lid is also called a connector cap. Usually, the connector cap is formed so as to seal the insertion hole when the connector cap is attached to the casing, so that the waterproof performance of the casing can be improved.

  The above-mentioned connector cap is manually attached / detached by the user. However, if the connector cap is not properly attached to the housing, foreign matter may enter the insertion hole, resulting in damage to the terminal portion and poor contact. Etc. may occur. In this regard, in an electronic device having a connector cap to which a variable resistance rubber is attached, a technique for detecting the open / close state of the connector cap based on a change in the resistance value of the variable resistance rubber due to deformation of the connector cap is known. Yes. However, when the above method is adopted, the wiring connection for detecting the change in resistance value may be complicated, and the variable resistance rubber is easily damaged by the deformation of the connector cap, so the detection reliability is high. May decrease. Further, in the above method, since the resistance change between the state where the connector cap is completely closed and the state where the connector cap is slightly opened is very small, the threshold value for detecting the open / close state is set large. . For this reason, in the above method, since the detection signal is generated only when the connector cap is largely opened, it cannot be accurately determined whether or not the connector cap is properly attached.

  By the way, in recent years, with the demand for miniaturization and thinning of mobile phone terminals, there are cases where the arrangement of the power switch in the housing, the size of the battery incorporated in the housing, and the like are restricted. FIG. 1 is a plan view showing an internal structure of a casing of a mobile phone terminal in the related art. In the example of FIG. 1, the substrate SB is disposed in the upper portion of the internal space of the housing HS, and the battery BT is disposed in the lower portion of the internal space of the housing HS. When such a structure is adopted, the rod antenna RA is disposed on one side surface of the substrate SB in the left-right direction, and the USB connector CN1 and the SIM / SD connector CN2 are disposed on the opposite side surface of the substrate SB. As a result, since the arrangement of the power switch BS is limited to the side of the battery BT, the lateral dimension of the battery BT is reduced by the amount of space in the housing HS for installing the power switch BS.

  In this connection, in a portable device having an openable / closable transparent cover and a circuit pattern built in the cover, the circuit pattern operates as an antenna when the cover is open, and operates as a capacitance switch when the cover is closed. The technique of making it known is known. However, in the above method, since the openable transparent cover is hinged to the main body, the structure of the apparatus main body is complicated, and the size of the entire apparatus may be increased. Further, in the above method, since the means for switching the function of the circuit pattern in the cover is built in the main body in addition to the means for determining whether the transparent cover is opened or closed, the system configuration of the entire device may be complicated.

JP 2014-11035 A JP 2008-270862 A

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an electronic device that can reduce a space in a housing for installing a push switch such as a power switch.

  According to one embodiment of the present invention, a housing, a cap that is attachable to the housing, and is formed so that the distance to the housing changes when pressed while attached to the housing, and the cap Connected to a second conductive part installed at a position of the cap opposite to the first conductive part when mounted on the housing, and a variable capacitor formed by the first conductive part and the second conductive part And an electronic device comprising: a detection circuit that determines whether or not the cap is pressed in a state where the cap is mounted on the housing based on a comparison between the resonance frequency of the resonance circuit and a predetermined reference value. Provided.

  The disclosed electronic device detects a resonance frequency of a resonance circuit including a variable capacitor formed by a conductive portion on the housing side and a conductive portion on the cap side, and is based on a comparison between a detected value of the resonance frequency and a predetermined reference value The cap is pressed. The capacitance of the variable capacitor increases as the distance between the two conductive portions decreases, and the resonance frequency of the resonance circuit decreases as the capacitance of the variable capacitor increases. Therefore, according to the disclosed electronic device, it is possible to accurately determine whether or not the movement distance of the cap with respect to the housing exceeds a predetermined threshold value, and as a result, the cap is pressed in a state where the cap is mounted on the housing. It can be accurately determined whether or not. As described above, according to the disclosed electronic device, a cap that can be attached to the housing can be used as a push switch such as a power switch, thereby reducing a space in the housing for installing the push switch. be able to.

FIG. 1 is a plan view showing an internal structure of a casing of a mobile phone terminal in the related art. FIG. 2 is a perspective view showing the electronic apparatus of the first embodiment. FIG. 3A is a perspective view showing the vicinity of the connector cap in the electronic apparatus of the first embodiment. FIG. 3B is a perspective view of the electronic device of FIG. 3A viewed from another angle. 4A is a plan view showing a receiving surface of the housing in FIG. 3A. FIG. 4B is a plan view showing a facing surface of the connector cap in FIG. 3B. FIG. 5A is a cross-sectional view illustrating a housing and a connector cap of the electronic device according to the first embodiment. FIG. 5B is a cross-sectional view similar to FIG. 5A, and shows a state where a connector cap is attached, which is different from FIG. 5A. FIG. 5C is a cross-sectional view similar to FIGS. 5A and 5B, and shows a state where the connector cap 2 is mounted differently from FIGS. 5A and 5B. FIG. 6 is a block diagram illustrating a system configuration of the electronic apparatus according to the first embodiment. FIG. 7 is a circuit diagram of a resonance circuit in the resonance frequency detection circuit in FIG. FIG. 8 is a graph showing a correspondence relationship between the frequency of the AC power supply of the resonance circuit of FIG. 7 and the detection signal output from the output amplifier. FIG. 9 is a flowchart illustrating the procedure of the state determination process performed by the electronic apparatus according to the first embodiment. FIG. 10 is a cross-sectional view similar to FIG. 5A showing a modification of the electronic apparatus of the first embodiment. FIG. 11A is a perspective view showing the vicinity of the connector cap in the electronic apparatus of the second embodiment. FIG. 11B is a perspective view of the electronic device of FIG. 11A viewed from another angle. 12A is a plan view showing a receiving surface of the housing in FIG. 11A. FIG. 12B is a plan view showing a facing surface of the connector cap in FIG. 11B. FIG. 13A is a cross-sectional view of the housing and connector cap of the electronic device of the second embodiment. FIG. 13B is a cross-sectional view similar to FIG. 13A and shows a state where a connector cap is attached, which is different from FIG. 13A. FIG. 13C is a cross-sectional view similar to FIGS. 13A and 13B, and shows a state in which a connector cap is attached, which is different from FIGS. FIG. 14 is a circuit diagram of a resonance circuit in the resonance frequency detection circuit of the electronic device of the second embodiment. FIG. 15 is a graph showing a correspondence relationship between the frequency of the AC power supply of the resonance circuit of FIG. 14 and the detection signal output from the output amplifier.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an electronic device according to the present application will be described in detail based on specific examples with reference to the accompanying drawings. In the embodiment described below, a small and portable electronic device such as a mobile phone terminal or a wearable terminal is illustrated as the electronic device according to the present application. However, the electronic device according to the present application may be a medium-sized or large-sized electronic device such as a tablet terminal or a mobile PC, or may be a non-portable electronic device such as a desktop PC or a server.

  First, the electronic device 1 according to the first embodiment of the present application will be described. FIG. 2 is a perspective view of the electronic apparatus 1 according to the first embodiment. As shown in FIG. 2, the electronic device 1 includes a housing 10 having an overall shape of a thin rectangular parallelepiped. The housing 10 intersects the front wall portion F including the thin display panel DP, the rear wall portion R arranged in parallel with the front wall portion F, the front wall portion F and the rear wall portion R, and the housing 10. And a pair of side wall portions L1 and L2 extending along the longitudinal direction. In addition, the electronic device 1 includes a connector cap 2 that is detachably attached to the side wall portion L1 of the housing 10. The connector cap 2 is an example of a cap of the electronic device 1 according to the present application.

  FIG. 3A is a perspective view showing the vicinity of the connector cap 2 in the electronic apparatus 1 of this embodiment. FIG. 3A shows the electronic device 1 with the connector cap 2 removed from the housing 10. As shown in FIG. 3A, the side wall L1 of the housing 10 is provided with an insertion hole I for electrical connection between the electronic device 1 and an external device. Inside the insertion hole I, a connector (not shown) that can be coupled with a terminal of a connection tool such as a cable used for connection with an external device is installed. The external device includes a charger for charging a secondary battery built in the housing, an external storage that can transfer data in a memory built in the housing, and the like. In addition to or instead of the above connector, a slot-like connection portion to which a small (particularly thin) device such as a memory card or a SIM card (Subscriber Identity Module Card) is directly connected has an insertion hole. It may be installed inside I.

  In the electronic device 1 of the present embodiment, the connector cap 2 is formed so as to close the insertion hole I of the housing 10 by being attached to the side wall portion L1 of the housing 10. As shown in FIG. 3A, the connector cap 2 is movably attached to the side wall portion L <b> 1 of the housing 10 via a rod-like connecting member CM and a guide member GM that guides the movement of the connecting member CM. One end of the connecting member CM is fixed to the surface of the connector cap 2 facing the housing 10. The guide member GM has a hole TH through which the connecting member CM is inserted, and is fixed inside the insertion hole I of the housing 10. FIG. 3B is a perspective view of the electronic device 1 of FIG. 3A viewed from another angle. 3A and 3B, when the connector cap 2 and the connecting member CM are pushed in the direction of the arrow A30, the connecting member CM is stored inside the housing 10 through the hole TH of the guide member GM. 2 is mounted on the side wall L1 of the housing 10 (see also FIG. 2).

  As shown in FIGS. 3A and 3B, the connector cap 2 is fixed to the flat lid portion 21, the protruding portion 22 formed on the surface of the lid portion 21 facing the housing 10, and the outer peripheral surface of the protruding portion 22. And an annular elastic seal member 23. The lid portion 21 of the connector cap 2 is formed so as to cover the insertion hole I of the housing 10 when the connector cap 2 is attached to the housing 10. In particular, the surface of the lid portion 21 that faces the housing 10 includes a facing surface 210 that faces the receiving surface P1 on the housing 10 side when the connector cap 2 is attached to the housing 10. As shown in FIG. 3B, the facing surface 210 of the lid portion 21 is formed in an annular shape so as to surround the outer periphery of the protruding portion 22.

  The protrusion 22 of the connector cap 2 is formed so as to be fitted inside the insertion hole I when the connector cap 2 is mounted on the housing 10. The lid 21 and the protrusion 22 can be formed by, for example, integral molding of various resin materials. The elastic seal member 23 is locked in an annular groove formed on the outer peripheral surface of the protrusion 22, and when the protrusion 22 is fitted inside the insertion hole I, the outer peripheral surface of the protrusion 22 and the insertion hole I are inserted. It plays the role of the sealing member which seals between the inner peripheral surfaces. Further, the elastic seal member 23 serves as an elastic member that gives a restoring force to the connector cap 2 when the connector cap 2 is pressed in a state where the connector cap 2 is mounted on the housing 10. This restoring force will be described later with reference to FIGS. 5A to 5C and the like. The elastic seal member 23 can be formed of, for example, a rubber material such as silicon rubber or nitrile rubber.

  3A and 3B, the receiving surface P1 of the housing 10 has a shape corresponding to the facing surface 210 of the connector cap 2, and is in the depth direction of the insertion hole I from the outer surface of the side wall portion L1. Are depressed. In FIG. 3A, the depth direction of the insertion hole I is represented by an arrow A30 (the same applies to other drawings). Hereinafter, the depth direction of the insertion hole I may be simply referred to as “depth direction”. The distance in the depth direction from the outer surface of the side wall portion L1 to the receiving surface P1 is made larger than the thickness of the lid portion 21 of the connector cap 2. Thereby, when the connector cap 2 is attached to the housing 10, the lid portion 21 can be prevented from projecting outward with respect to the side wall portion L1.

  As shown in FIG. 3A, the electronic device 1 has a first conductive portion 31 installed in a predetermined pattern on the receiving surface P <b> 1 of the housing 10. The first conductive part 31 may have a conductive film form formed by direct patterning such as LDS (Laser Direct Structure). Such a conductive film may be formed by plating a resin product manufactured by two-color molding. Further, as shown in FIG. 3B, the electronic device 1 has the second conductive portion 32 installed in a predetermined pattern on the facing surface 210 of the connector cap 2. Similar to the first conductive portion 31, the second conductive portion 32 may have a conductive film formed by direct patterning or a combination of two-color molding and plating.

  FIG. 4A is a plan view showing the receiving surface P1 of the housing 10 in FIG. 3A. As shown in FIG. 4A, the first conductive portion 31 on the housing 10 side includes first and second electrode portions E <b> 1 and E <b> 2 disposed on both sides of the insertion hole I in the longitudinal direction of the housing 10. . The first and second electrode portions E1 and E2 have the same dimensions and shape and are located on the same plane parallel to the receiving surface P1. The first and second electrode portions E1, E2 are electrically separated from each other.

  4B is a plan view showing the facing surface 210 of the connector cap 2 in FIG. 3B. As shown in FIG. 4B, the second conductive portion 32 on the connector cap 2 side is disposed so as to face the first and second electrode portions E1 and E2 when the connector cap 2 is attached to the housing 10. The third and fourth electrode portions E3 and E4 are included. The third and fourth electrode portions E3 and E4 have the same dimensions and shape and are located on the same plane parallel to the facing surface 210 of the connector cap 2. The third and fourth electrode portions E3 and E4 are electrically connected to each other by a connection portion EC extending along the longitudinal direction of the connector cap 2. The first to fourth electrode portions E <b> 1 to E <b> 4 form a variable capacitor whose electrostatic capacity changes according to the positional relationship between the housing 10 and the connector cap 2. The variable capacitor will be described in detail with reference to FIGS. 5A to 5C and FIG.

  FIG. 5A is a cross-sectional view illustrating the housing 10 and the connector cap 2 of the electronic apparatus 1 according to the present embodiment. In particular, FIG. 5A shows a cross section of the housing 10 and the connector cap 2 along the line VV in FIGS. 4A and 4B. In FIG. 5A, the structure of the protrusion 22 of the connector cap 2 is simplified, and the connecting member CM and the guide member GM are omitted. As shown in FIG. 5A, the first and second electrode portions E1 and E2 are disposed inside the grooves GR1 and GR1 formed in the receiving surface P1 of the housing 10, and the third and fourth electrode portions. E3 and E4 are disposed inside the grooves GR2 and GR2 formed in the facing surface 210 of the connector cap 2.

  As shown in FIG. 5A, the housing 10 faces the inner peripheral surface P <b> 2 of the insertion hole I that faces the outer peripheral surface of the protrusion 22 when the connector cap 2 is mounted, and the tip of the protrusion 22 when the connector cap 2 is mounted. The bottom surface P3 of the insertion hole I to be included. In the state of FIG. 5A, since the elastic seal member 23 is in close contact with the inner peripheral surface P2 of the insertion hole I, the sealing performance of the insertion hole I is sufficiently ensured. That is, FIG. 5A shows an example of a state in which the connector cap 2 is properly attached to the housing 10. In the state of FIG. 5A, a gap of a distance d exists between the first and third electrode portions E1, E3 and the second and fourth electrode portions E2, E4, and the protrusion 22 of the connector cap 2 There is also a gap CR between the tip and the bottom surface P3 of the insertion hole I.

  In the electronic apparatus 1 of the present embodiment, the connector cap 2 is formed so as to move in the depth direction with respect to the housing 10 when pressed down while being attached to the housing 10. In particular, the connector cap 2 can move in the depth direction until the gap CR is eliminated. That is, when the connector cap 2 in FIG. 5A is pressed by the user's fingertip or the like, the depth between the first electrode portion E1 on the housing 10 side and the third electrode portion E3 on the connector cap 2 side. The directional distance d will decrease. As described above, when the electronic device 1 is not connected to an external device, the connector cap 2 receives a predetermined instruction from the user in addition to the role of the covering member that prevents foreign matter from entering the insertion hole I. Can act as a switch. Hereinafter, the distance d in the depth direction between the first electrode part E1 and the third electrode part E3 is referred to as an interelectrode distance d. The distance in the depth direction between the second electrode portion E2 and the fourth electrode portion E4 is equal to the inter-electrode distance d.

  The push switch realized by the connector cap 2 is, for example, a power switch for switching on / off the power supply of the electronic device 1. Alternatively, the push switch may be an operation switch for operating an imaging device such as a digital camera built in the housing 10 or various applications installed in the electronic device 1. The above-mentioned push switch does not need to be always operated, and for example, it may be controlled to start when a predetermined application is started and to end when the application ends. When the connector cap 2 is removed from the housing 10 (see FIGS. 3A and 3B), the electronic device 1 communicates with an external device via a cable inserted into the insertion hole I, for example. The user's instruction is accepted by.

By the way, the capacitance C of the parallel plate capacitor can be obtained from the following formula (1). In the equation, S is the area of each electrode, d is the distance between the two electrodes, and ε is the dielectric constant of the dielectric disposed between the two electrodes.

  As can be seen from the above formula (1), the first to fourth electrode portions E1 to E4 form a variable capacitor whose capacitance increases as the interelectrode distance d decreases. In the example of FIG. 5A, the left capacitor in the figure formed from the first and third electrode portions E1 and E3, and the right capacitor formed from the second and fourth electrode plates E2 and E4, A synthetic capacitor connected in series is handled as the variable capacitor. The value of the interelectrode distance d in FIG. 5A is d = d0, and the value of the capacitance C of the variable capacitor is C = C0. In the state of FIG. 5A, the elastic seal member 23 is in contact with not only the inner peripheral surface P2 of the insertion hole I but also the bottom surface P3. However, the external force in the depth direction does not act on the connector cap 2 in FIG. 5A. The values of the interelectrode distance d and the capacitance C of the variable capacitor in FIG. 5A may be hereinafter referred to as initial values d0 and C0.

  In the electronic device 1 of this embodiment, the elastic seal member 23 is compressed by receiving a reaction force from the bottom surface P3 of the insertion hole I when the connector cap 2 receives the external force in the depth direction and moves from the position of FIG. It is formed to be deformed. FIG. 5B is a cross-sectional view similar to FIG. 5A, and shows a mounting state of the connector cap 2 different from FIG. 5B. Specifically, FIG. 5B shows a state in which the connector cap 2 in FIG. 5A has moved by a slight distance due to an external force in the depth direction. Therefore, the inter-electrode distance d1 in FIG. 5B is smaller than the initial value d0 in FIG. 5A (d1 <d0), and the capacitance C1 of the variable capacitor in FIG. 5B is smaller than the initial value C0 in FIG. Large (C1> C0). However, in the state of FIG. 5B, since the moving distance of the connector cap 2 is insufficient, the connector cap 2 has not been pressed yet, and the user's instruction for the connector cap 2 as a press switch has not been received yet. .

  The value (d1) of the interelectrode distance d in FIG. 5B is an example of a boundary value of the interelectrode distance d that represents a state where the connector cap 2 is not pressed. That is, in the electronic device 1 of this embodiment, when the inter-electrode distance d is less than the value (d1) in FIG. 5B, the connector cap 2 is pressed down (that is, the connector cap 2 as a pressing switch is used by the user). Is accepted). 5B, the elastic seal member 23 is compressed and deformed by receiving a reaction force from the bottom surface P3 of the insertion hole I. Therefore, when the external force applied to the connector cap 2 is released, the connector cap 2 returns to the state shown in FIG. 5A due to the restoring force of the elastic seal member 23. In the electronic device 1 of the present embodiment, the resonance frequency of the resonance circuit including the variable capacitor is detected, and the pressed state of the connector cap 2 is determined based on the detected value of the resonance frequency. Such a determination process is hereinafter referred to as a state determination process. Details of the state determination process will be described later with reference to FIG.

  FIG. 5C is a cross-sectional view similar to FIGS. 5A and 5B, and shows a state where the connector cap 2 is mounted differently from FIGS. 5A and 5B. Specifically, FIG. 5C shows a state in which the connector cap 2 in FIG. 5A has moved a small distance in the opposite direction of the depth direction. However, since the elastic seal member 23 of the connector cap 2 is in close contact with the inner peripheral surface P2 of the insertion hole I even in the state of FIG. 5C, the sealing performance of the insertion hole I is sufficiently ensured. Since the inter-electrode distance d2 in FIG. 5C is larger than the initial value d0 in FIG. 5A (d2> d0), the capacitance C2 of the variable capacitor in FIG. 5C is smaller than the initial value C0 in FIG. 5A (C2 <C0).

  The value (d2) of the inter-electrode distance d in FIG. 5C is an example of a boundary value of the inter-electrode distance d that represents a state in which the connector cap 2 is properly attached. That is, when the connector cap 2 in FIG. 5C further moves in the direction opposite to the depth direction, the elastic seal member 23 does not adhere to the inner peripheral surface P2 of the insertion hole I, so that the sealing performance of the insertion hole I is sufficiently secured. It will not be done. Hereinafter, such a state may be referred to as a state in which the connector cap 2 is erroneously attached. In the state determination process described above, the mounting state of the connector cap 2 is further determined based on the detected value of the resonance frequency.

  Next, FIG. 6 is a block diagram illustrating a system configuration of the electronic apparatus 1 according to the present embodiment. As shown in FIG. 6, the electronic device 1 includes a processor 11, a wireless communication unit 12, an audio input / output unit 13, a storage unit 14, a touch sensor unit 15, a display unit 16, a vibration generation unit 17, a resonance frequency detection circuit 18, and The connector part CN is included. The above components will be described in detail below.

  The processor 11 is an MPU (Micro Processing Unit) that controls the operation of each unit by executing a program in the storage unit 14. The control process executed by the processor 11 includes the mounting determination process described above. The wireless communication unit 12 is a communication interface that performs wireless communication with an external device using a wireless communication antenna. In particular, the wireless communication unit 12 can perform wireless communication with a base station according to a communication method such as W-CDMA (Wideband Code Multiple Access), CDMA2000, or LTE (Long Term Evolution). The wireless communication unit 12 can also communicate with an access point in accordance with a wireless LAN (Local Area Network) standard such as Wi-Fi (Wireless Fidelity).

  The audio input / output unit 13 includes a microphone (not shown) that functions as an audio input device and a speaker (not shown) that functions as an audio output device. The audio input / output unit 13 has a function of converting an audio signal input from the microphone into an electric signal and outputting the electric signal to the processor 11, and a function of converting the electric signal input from the processor 11 into an audio signal and outputting the audio signal from the speaker. Have. The storage unit 14 is a data storage area including a RAM (Random Access Memory) and a ROM (Read Only Memory). For example, the storage unit 14 stores various control programs executed by the processor.

  The touch sensor unit 15 is an input device that accepts a user's operation, and includes a capacitive or resistive touch panel built in the display panel DP (see FIGS. 2 and 3B and the like). The touch panel may employ other methods such as a matrix method, a surface acoustic wave method, an infrared method, or an electromagnetic induction method. The display unit 16 has a function of displaying a still image or moving image video signal input from the processor 11 on the display panel DP. The vibration generating unit 17 includes a vibrator such as a vibration motor, and has a function of generating vibration that can be sensed by the user in the housing 10 in accordance with a control signal input from the processor 11.

  The connector part CN is a circuit component including the first to fourth electrode parts E1 to E4. As described with reference to FIGS. 5A to 5C, the capacitance C of the first to fourth electrode portions E1 to E4 varies depending on the positional relationship between the casing 10 and the connector cap 2 in the depth direction. A variable capacitor is formed.

  The resonance frequency detection circuit 18 is an electronic circuit including a resonance circuit including the variable capacitor and a frequency converter that arbitrarily changes the frequency of the AC power supply of the resonance circuit. The resonance frequency detection circuit 18 is an example of a detection circuit for an electronic device according to the present application. FIG. 7 is a circuit diagram of the resonance circuit 181 in the resonance frequency detection circuit 18 in FIG. The points a and b located on both sides of the variable capacitor 4 in FIG. 7 correspond to points a and b in the housing 10 in FIG. 3A, respectively. As shown in FIG. 7, the resonance circuit 181 is an RLC series resonance circuit, and further includes an output amplifier AMP that amplifies the current signal of the circuit and outputs a detection signal G having a resonance frequency.

FIG. 8 is a graph showing a correspondence relationship between the frequency f of the AC power source E of the resonance circuit 181 of FIG. 7 and the detection signal G output from the output amplifier AMP. The resonance frequency detection circuit 18 detects the resonance frequency of the resonance circuit 181 based on the change of the detection signal G shown in the graph of FIG. Specifically, the resonance frequency detection circuit 18 detects the maximum value of the detection signal G obtained while changing the frequency f of the AC power source E within a predetermined range as the resonance frequency fr of the resonance circuit 181. ing. Generally, the resonance frequency of the RLC series resonance circuit is obtained from the following formula (2). C in the equation is the capacitance of the capacitor, and L in the equation is the inductance of the coil.

  A first waveform W1 in FIG. 8 shows a change in the detection signal G corresponding to the position of the connector cap 2 in FIG. 5A. That is, the first waveform W1 shows a change in the detection signal G when the value of the capacitance C of the variable capacitor 4 is C = C0. Further, the second waveform W2 in FIG. 8 shows a change in the detection signal G corresponding to the position of the connector cap 2 in FIG. 5B. That is, the second waveform W2 shows a change in the detection signal G when the value of the capacitance C of the variable capacitor 4 is C = C1 (C1> C0). As can be seen from the above equation (2), the resonance frequency f of the RLC series resonance circuit is inversely proportional to the square root of the capacitance C of the capacitor. That is, since the resonance frequency f decreases as the capacitance C increases, the resonance frequency fr1 of the resonance circuit 181 corresponding to the position of the connector cap 2 in FIG. 5B is the resonance frequency fr0 corresponding to the position in FIG. 5A. Smaller than.

  Subsequently, a third waveform W3 in FIG. 8 shows a change in the detection signal G corresponding to the position of the connector cap 2 in FIG. 5C. That is, the third waveform W2 shows a change in the detection signal G when the value of the capacitance C of the variable capacitor 4 is C = C2 (C2 <C0). As can be seen from the above equation (2), the resonance frequency f increases as the capacitance C decreases. Therefore, the resonance frequency fr2 of the resonance circuit 181 corresponding to the position of the connector cap 2 in FIG. It becomes higher than the resonance frequency fr0 corresponding to the middle position.

Table 1 below shows an example of the detection result of the resonance frequency fr by the resonance frequency detection circuit 18. The dielectric constant ε in Table 1 is the dielectric constant of air. As can be seen from Table 1, when the inter-electrode distance d decreases, the capacitance C of the variable capacitor 4 increases, so the resonance frequency fr of the resonance circuit 181 decreases. On the other hand, when the inter-electrode distance d increases, the capacitance C of the variable capacitor 4 decreases, so that the resonance frequency fr of the resonance circuit 181 increases.

  Referring to FIG. 6 again, the resonance frequency detection circuit 18 is in a state in which the connector cap 2 is attached to the housing 10 based on a comparison between the detection value of the resonance frequency fr and a predetermined first reference value. It has a function to determine whether or not it has been pressed. In particular, the resonance frequency detection circuit 18 determines whether or not the detected value of the resonance frequency fr is lower than the first reference value. For example, the resonance frequency detection circuit 18 may employ a resonance frequency value (fr1) corresponding to the interelectrode distance d1 in FIG. 5B as the first reference value. In this embodiment, when the inter-electrode distance d is in the range from the value d0 in FIG. 5A to the value d1 in FIG. 5B, the connector cap 2 is not pressed because the moving distance of the connector cap 2 is insufficient. I think. Therefore, when the detected value of the resonance frequency fr is equal to or greater than the value (fr1) corresponding to the interelectrode distance d1 in FIG. 5B (when fr ≧ fr1), the resonance frequency detection circuit 18 does not press the connector cap 2. It is judged. On the other hand, the resonance frequency detection circuit 18 determines that the connector cap 2 has been pressed when the detected value of the resonance frequency fr falls below the value (fr1) corresponding to the interelectrode distance d1 in FIG. 5B (when fr <fr1). doing.

  In the electronic apparatus 1 according to the present embodiment, the resonance frequency detection circuit 18 appropriately connects the connector cap 2 to the housing 10 based on a comparison between the detection value of the resonance frequency fr and a predetermined second reference value. It has a function of further determining whether or not it is attached. In particular, the resonance frequency detection circuit 18 determines whether or not the detected value of the resonance frequency fr exceeds the second reference value. For example, the resonance frequency detection circuit 18 can employ the value (fr2) of the resonance frequency fr corresponding to the interelectrode distance d2 in FIG. 5C as the second reference value. As described above, when the inter-electrode distance d is equal to or smaller than the value (d2) in FIG. 5C, the sealing performance of the insertion hole I of the housing 10 is sufficiently ensured. Therefore, when the detected value of the resonance frequency fr is equal to or smaller than the value (fr2) corresponding to the interelectrode distance d2 in FIG. 5C (when fr ≦ fr2), the resonance frequency detection circuit 18 attaches the connector cap 2 to the housing 10. It is determined that it is properly worn.

  On the other hand, when the inter-electrode distance d is larger than the value (d2) in FIG. 5C, the sealing property of the insertion hole I of the housing 10 is not sufficiently ensured. Therefore, when the detected value of the resonance frequency fr exceeds the value (fr2) corresponding to the inter-electrode distance d2 in FIG. 5C (when fr> fr2), the resonance frequency detection circuit 18 causes the connector cap 2 to be attached to the housing 10. It is determined that it was installed incorrectly. The first and second reference values of the resonance frequency fr used for the above series of determinations are detected in advance by the resonance frequency detection circuit 18 and stored in the storage unit 14. The resonance frequency detection circuit 18 reads and temporarily stores the first and second reference values in the storage unit 14 when the above determination is performed. Note that the resonance frequency detection circuit 18 may be a dedicated circuit separate from the processor 11 or may be realized as a function of the processor 11.

  Subsequently, the state determination process will be described. FIG. 9 is a flowchart illustrating the procedure of the mounting determination process executed in the electronic device 1 of the present embodiment. As shown in FIG. 9, in step S901, the resonance frequency detection circuit 18 reads the first reference value (fr1) and the second reference value (fr2) of the resonance frequency fr from the storage unit 14. In step S902, the resonance frequency detection circuit 18 detects the resonance frequency fr of the resonance circuit 181. In step S903, the resonance frequency detection circuit 18 determines whether or not the value of the resonance frequency fr detected in step S902 is lower than the first reference value (fr1) read in step S901.

  If the detected value of the resonance frequency fr is lower than the first reference value (fr1) (YES in step S903), the resonance frequency detection circuit 18 outputs an output signal indicating that the connector cap 2 has been pressed to the processor. 11 (step S904). In response to the output signal transmitted in step S904, the processor 11 executes a control process for switching on / off the power supply of the electronic device 1. Further, the processor 11 transmits a predetermined control signal to the vibration generating unit 17 in response to the output signal transmitted in step S904. Next, the vibration generator 17 generates a vibration for notifying the user that the connector cap 2 has been pressed in accordance with the control signal of the processor. Thereafter, one loop of the state determination process ends (return). On the other hand, when the detected value of the resonance frequency fr is equal to or higher than the first reference value (fr1) (NO in step S903), the flowchart proceeds to step S905 described later. In step S905, the resonance frequency detection circuit 18 determines whether or not the value of the resonance frequency fr detected in step S902 exceeds the second reference value (fr2) read in step S901.

  When the detected value of the resonance frequency fr exceeds the second reference value (fr2) (YES in step S905), the resonance frequency detection circuit 18 outputs an output signal indicating that the connector cap 2 is erroneously attached. It is transmitted to the processor 11 (step S906). The processor 11 transmits a predetermined control signal to the display unit 16 in response to the output signal transmitted in step S906. Next, the display unit 16 displays a predetermined warning message on the display panel DP indicating that the connector cap 2 is erroneously attached according to the control signal of the processor 11. Thereafter, one loop of the state determination process ends (return). On the other hand, when the detected value of the resonance frequency fr is equal to or lower than the second reference value (fr2) (NO in step S905), the procedure after step S902 is executed again. The above loop is repeatedly executed at a predetermined cycle. The state determination process is realized by a daemon (monitoring program) that always operates in the electronic device 1.

  As described above, in the electronic apparatus 1 according to the present embodiment, the resonance frequency detection circuit 18 includes the variable capacitor 4 formed by the conductive portion 31 on the housing 10 side and the conductive portion 32 on the connector cap 2 side. A resonance frequency fr of 181 is detected. The resonance frequency detection circuit 18 determines the pressed state of the connector cap 2 based on the comparison between the detected value of the resonance frequency fr and the first reference value (fr1). As described above, the capacitance C of the variable capacitor 4 increases as the inter-electrode distance d decreases, and the resonance frequency fr of the resonance circuit 181 decreases as the capacitance C of the variable capacitor 4 increases. Therefore, according to the electronic apparatus 1 of the present embodiment, it can be accurately determined whether or not the movement distance of the connector cap 2 with respect to the housing 10 exceeds a predetermined threshold, and as a result, the connector cap 2 is attached to the housing 10 It is possible to accurately determine whether or not the button is pressed in the pressed state. As described above, according to the electronic apparatus 1 of the present embodiment, the connector cap 2 that can be mounted on the housing 10 can be used as a push switch such as a power switch. The space in the body 10 can be reduced.

  Furthermore, in the electronic apparatus 1 of the present embodiment, the resonance frequency detection circuit 18 determines the mounting state of the connector cap 2 based on the comparison between the detection value of the resonance frequency fr and the second reference value (fr2). . As described above, the capacitance C of the variable capacitor decreases as the inter-electrode distance d increases, and the resonance frequency fr of the resonance circuit 181 increases as the capacitance C of the variable capacitor 4 decreases. Therefore, according to the electronic apparatus 1 of the present embodiment, it is possible to accurately determine whether the inter-electrode distance d of the variable capacitor 4 is equal to or less than the predetermined boundary value (d2). 10 can be accurately determined whether or not it is properly mounted.

  Then, the modification of the electronic device 1 of 1st Example is demonstrated. FIG. 10 is a cross-sectional view similar to FIG. 5A, showing a modification of the electronic apparatus 1 of the first embodiment. As shown in FIG. 10, the electronic apparatus 1 of this example includes a spring member 5 installed in the housing 10 so as to be compressed by the connector cap 2 when the connector cap 2 is pressed. The spring member 5 is formed to generate a click feeling when pressed by the connector cap 2. Here, the click feeling means a sound or touch for notifying the user that the push switch has been pressed.

  As shown in FIG. 10, the spring member 5 has a form of a dome-shaped leaf spring installed on the bottom surface P <b> 3 of the insertion hole I so as to protrude in the opposite direction of the depth direction. The connector cap 2 has a columnar portion 24 that further protrudes from the surface of the protruding portion 22 facing the bottom surface P3 of the insertion hole I, and the spring member 5 is pressed by the columnar portion 24 when the connector cap 2 is pressed. Are arranged as follows. According to the electronic device 1 of this example, the spring member 5 gives a good click feeling to the user's fingertip or the like via the connector cap 2 when the connector cap 2 is pressed, so that the operability of the connector cap 2 as a press switch is improved. Can be improved.

  Next, the electronic apparatus 1 according to the second embodiment of the present application will be described. The electronic device 1 of the present embodiment has the same structure as the electronic device 1 of the first embodiment described above, except for the portions described with reference to FIGS. 11A to 15 and the like.

  FIG. 11A is a perspective view showing the vicinity of the connector cap 2 in the electronic apparatus 1 of the present embodiment. As shown in FIG. 11A, the electronic device 1 is installed in a predetermined pattern on the first conductive portion 31 installed in a predetermined pattern on the receiving surface P1 of the housing 10 and on the inner peripheral surface P2 of the insertion hole I. A third conductive portion 33. FIG. 11B is a perspective view of the electronic device 1 of FIG. 11A viewed from another angle. As shown in FIG. 11B, the electronic device 1 includes a second conductive portion 32 installed in a predetermined pattern on the facing surface 210 of the connector cap 2 and a fourth conductive device installed in a predetermined pattern on the outer peripheral surface of the protrusion 22. And a conductive portion 34. The first to fourth conductive portions 31 to 34 may have a form of a conductive film formed by direct patterning or a combination of two-color molding and plating.

  12A is a plan view showing the receiving surface P1 of the housing 10 in FIG. 11A. As illustrated in FIG. 12A, the first conductive portion 31 includes first and second electrode portions E <b> 1 and E <b> 2 that are disposed on both sides of the insertion hole I in the longitudinal direction of the housing 10. The first and second electrode portions E1 and E2 have the same size and shape, and are electrically connected to each other by a first connection portion EC1 extending along the longitudinal direction of the housing 10. The third conductive portion 33 has a U-shaped thin plate extending along the inner peripheral surface P2 of the insertion hole I. The third conductive portion 33 is not electrically connected to the first and second electrode portions E1 and E2.

  FIG. 12B is a plan view illustrating the facing surface 210 of the connector cap 2 of the electronic device 1 according to the present embodiment. As shown in FIG. 12B, the second conductive portion 32 includes third and second electrodes disposed so as to face the first and second electrode portions E1 and E2, respectively, when the connector cap 2 is attached to the housing 10. 4th electrode part E3, E4 is included. The third and fourth electrode portions E3 and E4 have the same size and shape, and are electrically connected to each other by a second connection portion EC2 extending along the longitudinal direction of the connector cap 2. The fourth conductive portion 34 has a U-shaped thin plate extending along the outer peripheral surface of the protruding portion 22. The fourth conductive portion 34 is disposed so as to face the third conductive portion 33 when the connector cap 2 is attached to the housing 10. The fourth conductive portion 34 is electrically connected to the third and fourth electrode portions E3 and E4 by a third connection portion EC3 extending in a direction crossing the longitudinal direction of the connector cap 2.

  FIG. 13A is a cross-sectional view illustrating the housing 10 and the connector cap 2 of the electronic apparatus 1 according to the present embodiment. In particular, FIG. 13A shows a cross section of the housing 10 and the connector cap 2 along the line XIII-XIII in FIGS. 12A and 12B. In FIG. 13A, the structure of the protrusion 22 of the connector cap 2 is simplified, and the connecting member CM and the guide member GM are omitted. In the state of FIG. 13A, since the elastic seal member 23 is in close contact with the inner peripheral surface P2 of the insertion hole I, the sealing performance of the insertion hole I is sufficiently ensured. That is, FIG. 13A shows an example of a state in which the connector cap 2 is properly attached to the housing 10.

  Similar to the example of FIGS. 5A to 5C6C described above, the connector cap 2 is formed so as to move in the depth direction with respect to the housing 10 when pressed down while being attached to the housing 10. That is, when the connector cap 2 in FIG. 13A is pressed by the user's fingertip or the like, the depth between the first electrode portion E1 on the housing 10 side and the third electrode portion E3 on the connector cap 2 side. The directional distance d will decrease. As described above, when the electronic device 1 is not connected to an external device, the connector cap 2 receives a predetermined instruction from the user in addition to the role of the covering member that prevents foreign matter from entering the insertion hole I. Can act as a switch. Hereinafter, the distance d in the depth direction between the first electrode portion E1 and the third electrode portion E3 is referred to as an interelectrode distance d, as in the examples of FIGS. 5A to 5C. The distance in the depth direction between the second electrode part E2 and the fourth electrode part E4 is equal to the inter-electrode distance d. In addition, the area of the portion facing the fourth conductive portion 34 on the surface of the third conductive portion 33 is hereinafter referred to as an electrode area S.

  Similar to the example of FIGS. 5A to 5C, the first to fourth electrode portions E1 to E4 form a variable capacitor in which the capacitance C decreases according to the inter-electrode distance d. Hereinafter, this variable capacitor is referred to as a first variable capacitor. Further, the third and fourth conductive portions 33 and 34 form a variable capacitor in which the capacitance C ′ changes according to the electrode area S. Hereinafter, this variable capacitor is referred to as a second variable capacitor. In the state of FIG. 13A, the value of the interelectrode distance d of the first variable capacitor is d = d0, and the value of the capacitance C is C = C0. In the state of FIG. 13A, the value of the electrode area S of the second variable capacitor is S = S0, and the value of the capacitance C ′ is C ′ = C0 ′.

  In the state of FIG. 13A, the elastic seal member 23 is in contact with not only the inner peripheral surface P2 of the insertion hole I but also the bottom surface P3. However, an external force in the depth direction is not applied to the connector cap 2 in FIG. 13A. In the following, the interelectrode distance d and the capacitance C of the first variable capacitor in FIG. 13A may be referred to as initial values d0 and C0. Similarly, the values of the electrode area S and the capacitance C ′ of the second variable capacitor in FIG. 13A may be hereinafter referred to as initial values S0 and C0 ′. Similar to the example of FIGS. 5A to 5C described above, the elastic seal member 23 is removed from the bottom surface P3 of the insertion hole I when the connector cap 2 receives the external force in the depth direction and moves from the position in FIG. It is formed so as to compress and deform under force.

  FIG. 13B is a cross-sectional view similar to FIG. 13A, and shows a state where the connector cap 2 is mounted differently from FIG. 13A. Specifically, FIG. 13B shows a state in which the connector cap 2 in FIG. 13A has moved by a slight distance in response to an external force in the depth direction. Therefore, the interelectrode distance d1 in FIG. 13B is smaller than the initial value d0 in FIG. 13A (d1 <d0), and the capacitance C1 of the first variable capacitor in FIG. 13B is the initial value in FIG. 13A. It is larger than C0 (C1> C0). 13B is larger than the initial value S0 in FIG. 13A (S1> S0), and the capacitance C1 ′ of the second variable capacitor in FIG. 13B is the initial value in FIG. 13A. It is larger than C0 ′ (C1 ′> C0 ′). In the state of FIG. 13B, since the moving distance of the connector cap 2 is insufficient, the connector cap 2 has not been pressed yet, and the user's instruction for the connector cap 2 as a press switch has not been received yet.

  The value (d1) of the inter-electrode distance d in FIG. 13B is an example of a boundary value of the inter-electrode distance d that represents a state where the connector cap 2 is not pressed. That is, in the electronic device 1 of the present embodiment, when the inter-electrode distance d is less than the value (d1) in FIG. 13B, the connector cap 2 is pressed (that is, the connector cap 2 as a pressing switch is used by the user). Is accepted). In the state of FIG. 13B, the elastic seal member 23 is compressed and deformed by receiving a reaction force from the bottom surface P3 of the insertion hole I. Therefore, when the external force on the connector cap 2 is released, the connector cap 2 returns to the state shown in FIG. 13A by the restoring force of the elastic seal member 23.

  13C is a cross-sectional view similar to FIGS. 13A and 13B, and shows a state where the connector cap 2 is mounted differently from FIGS. 13A and 13B. Specifically, FIG. 13C shows a state in which the connector cap 2 in FIG. 13A has moved by a slight distance in the direction opposite to the depth direction. Therefore, the interelectrode distance d2 in FIG. 13C is larger than the initial value d0 in FIG. 13A (d2> d0), and the capacitance C2 of the first variable capacitor in FIG. 13C is the initial value in FIG. 13A. It is smaller than C0 (C2 <C0). Further, the electrode area S2 in FIG. 13C is smaller than the initial value S0 in FIG. 13A (S2 <S0), and the capacitance C2 ′ of the second variable capacitor in FIG. 13C is the initial value in FIG. 13A. It is smaller than C0 ′ (C2 ′ <C0 ′).

  Since the elastic seal member 23 of the connector cap 2 is in close contact with the inner peripheral surface P2 of the insertion hole I even in the state of FIG. 13C, the sealing performance of the insertion hole I is sufficiently ensured. The value (d2) of the interelectrode distance d in FIG. 13C is an example of a boundary value of the interelectrode distance d that represents a state in which the connector cap 2 is properly attached. That is, if the connector cap 2 in FIG. 13C further moves in the direction opposite to the depth direction, the sealing performance of the insertion hole I is not sufficiently ensured. In the electronic device 1 of the present embodiment, the resonance frequency of the resonance circuit including the composite capacitor in which the first and second capacitors are connected in series is detected, and the connector cap 2 is mounted based on the detected value of the resonance frequency. And the pressed state is determined. The specific procedure of such determination processing is the same as that in the example of FIG. 9 described above.

  Next, the system configuration of the electronic device 1 according to the present embodiment will be described. The system configuration of the electronic apparatus 1 of the present embodiment is the same as that of the above-described example of FIG. That is, the electronic device 1 according to the present embodiment includes a processor 11, a wireless communication unit 12, an audio input / output unit 13, a storage unit 14, a touch sensor unit 15, a display unit 16, a vibration generation unit 17, a resonance frequency detection circuit 18, and The connector part CN is included. The functions of the processor 11, the wireless communication unit 12, the audio input / output unit 13, the storage unit 14, the touch sensor unit 15, the display unit 16, and the vibration generation unit 17 of the electronic device 1 of the present embodiment are the same as the example of FIG. 6 described above. It is the same. Therefore, the remaining components of the electronic device 1 will be described below.

  The connector part CN is a circuit component including the first to fourth conductive parts 31 to 34 described above. As shown in FIGS. 12A and 12B, the first conductive portion 31 includes first and second electrode portions E1 and E2, and the second conductive portion 32 includes third and fourth electrode portions E3 and E4. Is included. As described with reference to FIGS. 13A to 13C, the first to fourth electrode portions E1 to E4 form a first variable capacitor in which the capacitance C changes according to the inter-electrode distance d. The third and fourth conductive portions 33 and 34 form a second variable capacitor whose electrostatic capacity C ′ changes according to the electrode area S.

  The resonance frequency detection circuit 18 is an electronic circuit including a resonance circuit including the first and second variable capacitors 41 and 42 and a frequency conversion circuit that arbitrarily changes the frequency of the AC power supply of the resonance circuit. FIG. 14 is a circuit diagram of the resonance circuit 181 of the resonance frequency detection circuit 18 in the electronic apparatus 1 of the present embodiment. As shown in FIG. 14, the resonance circuit 181 is an RLC series resonance circuit, and further includes an output amplifier AMP that amplifies a current signal of the circuit and outputs a detection signal G having a resonance frequency. The resonance circuit 181 includes a composite capacitor 40 formed by connecting first and second variable capacitors 41 and 42 in series. The points a and b located on both sides of the composite capacitor 40 in FIG. 14 correspond to points a and b in the housing 10 in FIG. 11A, respectively.

  FIG. 15 is a graph showing a correspondence relationship between the frequency f of the AC power source E of the resonance circuit 181 of FIG. 14 and the detection signal G output from the detection amplifier AMP. The resonance frequency detection circuit 18 detects the resonance frequency fr of the resonance circuit 181 based on the change of the detection signal G shown in the graph of FIG. Specifically, the resonance frequency detection circuit 18 detects the maximum value of the detection signal G obtained while changing the frequency f of the AC power source E within a predetermined range as the resonance frequency fr of the resonance circuit 181. ing.

  A first waveform W1 in FIG. 15 shows a change in the detection signal G corresponding to the connector cap 2 in FIG. 13A. That is, in the first waveform W1, the value of the capacitance C of the first variable capacitor 41 is C = C0, and the value of the capacitance C ′ of the second variable capacitor 42 is C ′ = C0 ′. The change of the detection signal G when is is shown. A second waveform W2 in FIG. 15 shows a change in the detection signal G corresponding to the connector cap 2 in FIG. 13B. That is, in the second waveform W2, the value of the capacitance C of the first variable capacitor 41 is C = C1 (C1> C0), and the value of the capacitance C ′ of the second variable capacitor 42 is When C ′ = C1 ′, the change of the detection signal G is indicated (C1 ′> C0 ′). In the resonance circuit 181 of FIG. 14, the resonance frequency fr decreases as the capacitance C of the first variable capacitor 41 increases, and the resonance frequency fr increases as the capacitance C ′ of the second variable capacitor 42 increases. Is formed to decrease. Therefore, the resonance frequency fr1 of the resonance circuit 181 corresponding to the state of FIG. 13B is smaller than the resonance frequency fr0 corresponding to the state of FIG. 13A (fr1 <fr0).

  Subsequently, a third waveform W3 in FIG. 15 shows a change in the detection signal G corresponding to the connector cap 2 in FIG. 13C. That is, in the third waveform W3, the value of the capacitance C of the first variable capacitor 41 is C = C2 (C2 <C0), and the value of the capacitance C ′ of the second variable capacitor 42 is A change in the detection signal G when C ′ = C2 ′ (C2 ′ <C0 ′) is shown. In the resonance circuit 181 of FIG. 14, the resonance frequency fr increases as the capacitance C of the first variable capacitor 41 decreases, and the resonance frequency fr increases as the capacitance C ′ of the second variable capacitor 42 decreases. Is formed to increase. Therefore, the resonance frequency fr2 of the resonance circuit 181 corresponding to the state of FIG. 13C is larger than the resonance frequency fr0 corresponding to the state of FIG. 13A (fr2> fr0).

Table 2 below shows an example of the detection result of the resonance frequency fr by the resonance frequency detection circuit 18. The dielectric constant ε in Table 2 is the dielectric constant of air. As can be seen from Table 2, when the inter-electrode distance d decreases, the capacitance Cs of the composite capacitor 40 increases, so that the resonance frequency fr of the resonance circuit 181 decreases. Further, when the electrode area S increases, the capacitance Cs of the composite capacitor 40 increases, so that the resonance frequency of the resonance circuit 181 decreases. On the other hand, when the inter-electrode distance d increases, the capacitance Cs of the composite capacitor 40 decreases, so that the resonance frequency fr of the resonance circuit 181 increases. Further, when the electrode area S decreases, the electrostatic capacitance Cs of the composite capacitor 40 decreases, so that the resonance frequency fr of the resonance circuit 181 increases.

  As can be seen from Tables 1 and 2, in the electronic apparatus 1 of this example, the resonance frequency (f0) corresponding to the initial value (d0) of the interelectrode distance d and the boundary value (d1) of the interelectrode distance d are supported. The difference (f0−f1) from the resonance frequency (f1) is relatively large. Similarly, in the electronic apparatus 1 of the present embodiment, the resonance frequency (f0) corresponding to the initial value (d0) of the interelectrode distance d and the resonance frequency (f2) corresponding to the boundary value (d2) of the interelectrode distance d The difference between (f2−f0) becomes relatively large. Therefore, according to the electronic apparatus 1 of the present embodiment, it is possible to more accurately determine the pressed state and the mounted state of the connector cap 2.

  Subsequently, whether the resonance frequency detection circuit 18 is pressed in a state where the connector cap 2 is attached to the housing 10 based on a comparison between the detection value of the resonance frequency fr and the predetermined first reference value. It has a function to determine whether or not. In particular, the resonance frequency detection circuit 18 determines whether or not the detected value of the resonance frequency fr is lower than the first reference value. For example, the resonance frequency detection circuit 18 can employ the value (fr1) of the resonance frequency corresponding to the inter-electrode distance d1 in FIG. 13B as the first reference value (see also FIG. 15). In this embodiment, when the inter-electrode distance d is in the range from the initial value (d0) in FIG. 13A to the value (d1) in FIG. 13B, the movement distance of the connector cap 2 is insufficient, so the connector cap 2 Assumes that it is not pressed. Therefore, when the detected value of the resonant frequency fr is equal to or greater than the value (fr1) corresponding to the interelectrode distance d1 in FIG. 13B (when fr ≧ fr1), the resonance frequency detection circuit 18 does not press the connector cap 2. It is determined. On the other hand, the resonance frequency detection circuit 18 determines that the connector cap 2 has been pressed when the detected value of the resonance frequency fr falls below the value (fr1) corresponding to the interelectrode distance d1 in FIG. 13B (when fr <fr1). doing.

  In the electronic apparatus 1 according to the present embodiment, the resonance frequency detection circuit 18 appropriately connects the connector cap 2 to the housing 10 based on a comparison between the detection value of the resonance frequency fr and a predetermined second reference value. It has a function of further determining whether or not it is attached. In particular, the resonance frequency detection circuit 18 determines whether or not the detected value of the resonance frequency fr exceeds the second reference value. For example, the resonance frequency detection circuit 18 can employ the value (fr2) of the resonance frequency fr corresponding to the interelectrode distance d2 in FIG. 13C as the second reference value. In this embodiment, when the inter-electrode distance d is equal to or less than the value (d2) in FIG. 13C, the sealing performance of the insertion hole I of the housing 10 is sufficiently ensured. Therefore, when the detected value of the resonance frequency fr is equal to or smaller than the value (fr2) corresponding to the interelectrode distance d2 in FIG. 13C (when fr ≦ fr2), the resonance frequency detection circuit 18 attaches the connector cap 2 to the housing 10. It is determined that it is properly worn.

  On the other hand, when the inter-electrode distance d is larger than the value (d2) in FIG. 13C, the sealing property of the insertion hole I of the housing 10 is not sufficiently ensured. Therefore, when the detected value of the resonance frequency fr exceeds the value (fr2) corresponding to the inter-electrode distance d2 in FIG. 13C (when fr> fr2), the resonance frequency detection circuit 18 causes the connector cap 2 to be attached to the housing 10. It is determined that it was installed incorrectly. The first and second reference values of the resonance frequency fr used for the above series of determinations are detected in advance by the resonance frequency detection circuit 18 and stored in the storage unit 14. The resonance frequency detection circuit 18 reads and temporarily stores the first and second reference values in the storage unit 14 when the above determination is performed. Note that the resonance frequency detection circuit 18 may be a dedicated circuit separate from the processor 11 or may be realized as a function of the processor 11.

  As described above, in the electronic apparatus 1 according to the present embodiment, the resonance frequency detection circuit 18 determines the pressed state of the connector cap 2 based on the comparison between the detection value of the resonance frequency fr and the first reference value (fr1). doing. Therefore, according to the electronic apparatus 1 of the present embodiment, it can be accurately determined whether or not the movement distance of the connector cap 2 with respect to the housing 10 exceeds a predetermined threshold, and as a result, the connector cap 2 is attached to the housing 10. It is possible to accurately determine whether or not the button is pressed in the pressed state. As described above, according to the electronic apparatus 1 of the present embodiment, the connector cap 2 that can be mounted on the housing 10 can be used as a push switch such as a power switch. The space in the body 10 can be reduced. In particular, in the electronic apparatus 1 of the present embodiment, the resonance frequency (f0) corresponding to the initial value (d0) of the interelectrode distance d and the resonance frequency (f1) corresponding to the boundary value (d1) of the interelectrode distance d. The difference between them (f0−f1) becomes relatively large (see Table 2). Therefore, according to the electronic apparatus 1 of the present embodiment, it is possible to determine the pressed state of the connector cap 2 more accurately.

  Furthermore, in the electronic apparatus 1 of the present embodiment, the resonance frequency detection circuit 18 determines the mounting state of the connector cap 2 based on the comparison between the detection value of the resonance frequency fr and the second reference value (fr2). . Therefore, according to the electronic apparatus 1 of the present embodiment, it is possible to accurately determine whether the inter-electrode distance d of the variable capacitor 4 is equal to or less than the predetermined boundary value (d2). 10 can be accurately determined whether or not it is properly mounted. In particular, in the electronic apparatus 1 of the present embodiment, the resonance frequency (f0) corresponding to the initial value (d0) of the interelectrode distance d and the resonance frequency (f2) corresponding to the boundary value (d2) of the interelectrode distance d. The difference between them (f2-f0) becomes relatively large (see Table 2). Therefore, according to the electronic apparatus 1 of the present embodiment, it is possible to determine the mounting state of the connector cap 2 more accurately.

  The present application has been described in detail with particular reference to preferred embodiments thereof. For easy understanding of the present application, specific forms of the present application are appended below.

(Supplementary note 1) Case and
A cap that is attachable to the housing and formed so that the distance to the housing changes when pressed in a state of being attached to the housing;
A first conductive portion installed on a receiving surface of the cap in the housing;
A second conductive portion installed at a position of the cap that faces the first conductive portion when the cap is attached to the housing;
A resonant circuit connected to a variable capacitor formed from the first conductive portion and the second conductive portion;
An electronic device comprising: a detection circuit that determines whether or not the cap is pressed in a state where the cap is attached to the housing based on a comparison between a resonance frequency of the resonance circuit and a predetermined reference value.

(Additional remark 2) The said detection circuit is an electronic device of Additional remark 1 which determines with the said cap having been pressed in the state with which the said housing | casing was mounted | worn when the said resonance frequency is less than the said reference value.
(Supplementary Note 3) The detection circuit further determines whether the cap is properly attached to the housing based on a comparison between the resonance frequency and another reference value different from the reference value. The electronic device according to appendix 1 or 2.
(Supplementary note 4) The electronic device according to supplementary note 3, wherein the detection circuit determines that the cap is not properly attached to the casing when the resonance frequency exceeds the other reference value.

(Additional remark 5) The 3rd electroconductive part installed in the surface of the said housing different from the said receiving surface facing the said cap when the said cap is mounted | worn with the said housing,
A fourth conductive portion installed at a position of the cap that faces the third conductive portion when the cap is attached to the housing; and
The resonance circuit includes any one of appendices 1 to 4, including a synthetic capacitor in which the variable capacitor and another variable capacitor formed from the third conductive portion and the fourth conductive portion are connected in series. The electronic device as described in.
(Supplementary Note 6) When the cap is attached to the casing, the cap is placed so as to be positioned between the cap and the casing, and the cap is pressed down while being attached to the casing. The electronic device according to any one of appendices 1 to 5, further comprising an elastic member formed so as to apply a restoring force to the cap.
(Supplementary note 7) The housing has an insertion hole for connection with an external device,
The electronic device according to any one of appendices 1 to 6, wherein the cap is formed so as to cover the insertion hole when attached to the housing.

(Supplementary Note 8) It is installed in the casing so as to be pressed by the cap when the cap is pressed in a state of being mounted on the casing, and a click feeling is generated when the cap is pressed by the cap. The electronic device according to any one of appendices 1 to 7, further comprising a spring member formed on the board.
(Supplementary note 9) The electronic device according to supplementary note 8, wherein the spring member is a dome-shaped leaf spring protruding in a direction opposite to a moving direction when the cap is pressed in a state where the cap is attached to the housing. .

DESCRIPTION OF SYMBOLS 1 Electronic device 10 Case 11 Processor 12 Wireless communication part 13 Audio input / output part 14 Storage part 15 Touch sensor part 16 Display part 17 Vibration generation part 18 Resonance frequency detection circuit 181 Resonance circuit 2 Connector cap 21 Cover part 210 Opposite surface 211 Upper surface 22 Protruding portion 23 Elastic seal member 24 Columnar portion 31 First conductive portion 32 Second conductive portion 33 Third conductive portion 34 Fourth conductive portion 4 Variable capacitor 41 First variable capacitor 42 Second variable capacitor 40 Composite Capacitor 5 Spring Member I Insertion Hole CM Connection Member DP Display Panel GM Guide Member TH Hole F Front Wall R Rear Wall P1 Receiving Surface P2 Inner Surface P3 Bottom L1 Side Wall L2 Side Wall E1 First Electrode E2 First 2 electrode part E3 3rd electrode part E4 4th electrode part EC connection part EC1 1st contact Part EC2 second connecting portion EC3 third connecting portion

Claims (6)

A housing,
A cap that is attachable to the housing and formed so that the distance to the housing changes when pressed in a state of being attached to the housing;
A first conductive portion installed on a receiving surface of the cap in the housing;
A second conductive portion installed at a position of the cap that faces the first conductive portion when the cap is attached to the housing;
A resonant circuit connected to a variable capacitor formed from the first conductive portion and the second conductive portion;
An electronic device comprising: a detection circuit that determines whether or not the cap is pressed in a state where the cap is attached to the housing based on a comparison between a resonance frequency of the resonance circuit and a predetermined reference value.   The electronic device according to claim 1, wherein the detection circuit determines that the cap is pressed in a state where the cap is attached to the housing when the resonance frequency is lower than the reference value.   The detection circuit further determines whether or not the cap is properly attached to the housing based on a comparison between the resonance frequency and another reference value different from the reference value. 2. The electronic device according to 2.   The electronic device according to claim 3, wherein the detection circuit determines that the cap is not properly attached to the housing when the resonance frequency exceeds the other reference value. A third conductive portion disposed on a surface of the housing different from the receiving surface, which faces the cap when the cap is attached to the housing;
A fourth conductive portion installed at a position of the cap that faces the third conductive portion when the cap is attached to the housing; and
The resonance circuit includes a synthetic capacitor in which the variable capacitor and another variable capacitor formed from the third conductive portion and the fourth conductive portion are connected in series. The electronic device of Claim 1.   When the cap is attached to the casing, the cap is installed so as to be positioned between the cap and the casing, and when the cap is pressed in a state of being attached to the casing, the cap The electronic device according to claim 1, further comprising an elastic member formed so as to apply a restoring force to the cap.

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