JP6558144B2 - 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. Such a connector includes an insertion hole formed in a 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. . When the distal end portion of the cable is inserted into the insertion hole and the terminal portion on the cable side contacts the terminal portion on the housing side, electrical connection between the electronic device and the external device is established through the cable. Similarly, when the terminal part on the IC card side comes into contact with the terminal part on the housing side, an electrical connection between the electronic device and the IC card is directly established.

  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.

  By the way, the connector cap is manually attached / detached by the user. However, if the connector cap is not properly attached to the housing, the foreign substance enters the insertion hole, and the terminal portion is thereby damaged and has 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. 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. ing. For this reason, in the above method, since a detection signal is generated only when the connector cap is largely opened, it has not been possible to accurately determine whether the connector cap is properly attached.

JP 2014-11035 A

  The present invention has been made in view of the above problems, and an object of the present invention is an electronic device having a cap that can be attached to a housing, and whether or not the cap is properly attached to the housing. It is to provide an electronic device that can accurately determine.

  According to one aspect of the embodiment, a cap that can be attached to the housing, a first conductive portion that is installed on a receiving surface of the cap in the housing, and the first conductive member when the cap is attached to the housing. Detecting a resonance frequency of the resonance circuit including a second conductive part installed at a position of the cap facing the part, a resonance circuit including a variable capacitor formed from the first conductive part and the second conductive part, An electronic device is provided that includes a detection circuit that determines whether a cap is attached to a housing based on a comparison between a reference value of a predetermined resonance frequency and a detection value of the resonance frequency.

  According to the disclosed electronic device, the resonance frequency of the resonance circuit including the variable capacitor formed by the conductive portion on the housing side and the conductive portion on the cap side is detected, and the detected value of the resonance frequency is compared with a predetermined reference value. Based on the above, the mounting state of the cap to the housing is determined. The capacitance of the variable capacitor decreases as the distance between the two conductive portions increases, and the resonance frequency of the resonance circuit increases as the capacitance of the variable capacitor decreases. Therefore, according to the disclosed electronic device, it is possible to accurately determine whether the distance between the two conductive portions is within a predetermined allowable range, and as a result, whether the cap is properly attached to the housing. Whether or not can be determined accurately.

FIG. 1A is a perspective view illustrating an electronic apparatus according to a first embodiment. FIG. 1B is a perspective view of the electronic device of FIG. 1A viewed from another angle. FIG. 2A is a perspective view showing the electronic apparatus with the connector cap removed from the housing. FIG. 2B is a perspective view of the electronic device in FIG. 2A viewed from another angle. FIG. 3A is an enlarged view showing the vicinity of the connector cap in FIG. 2A. FIG. 3B is an enlarged view showing the vicinity of the connector cap in FIG. 2B. 4A is a plan view showing a receiving surface of the housing in FIG. 3A. 4B is a plan view showing the contact 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 mounting state of the connector cap 2 different from FIG. 5A. 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 the correspondence 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 mounting determination process performed by the electronic device according to the first embodiment. FIG. 10A is a plan view illustrating a receiving surface of a housing of the electronic device according to the second embodiment. FIG. 10B is a plan view illustrating the contact surface of the connector cap of the electronic device according to the second embodiment. FIG. 10C is a plan view illustrating the upper surface of the connector cap of the electronic device according to the second embodiment. FIG. 11A is a cross-sectional view of the housing and connector cap of the electronic device of the second embodiment. FIG. 11B is a cross-sectional view similar to FIG. 11A, and shows a mounting state of the connector cap 2 different from FIG. 11A. FIG. 11C is a cross-sectional view similar to FIG. 11A and shows a state of the pressing portion of the connector cap different from FIG. 11A. FIG. 12 is a circuit diagram of a resonance circuit in the resonance frequency detection circuit of the electronic device of the second embodiment. FIG. 13 is a graph showing a correspondence relationship between the frequency of the AC power supply of the resonance circuit of FIG. 12 and the detection signal output from the output amplifier. FIG. 14 is a flowchart illustrating a procedure of state determination processing by the electronic apparatus of the second embodiment. FIG. 15 is a perspective view showing an electronic device to which a modified example of the pressing portion of the connector cap is applied. 16 is a cross-sectional view similar to FIG. 11A, showing the housing and connector cap in FIG. 15.

  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. 1A is a perspective view of the electronic apparatus 1 according to the first embodiment. As shown in FIG. 1A, 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. 1B is a perspective view of the electronic device 1 of FIG. 1A viewed from another angle. As shown in FIG. 1B, the electronic device 1 has a power button P installed on the other side wall L2 of the housing 10.

  FIG. 2A is a perspective view showing the electronic device 1 with the connector cap removed from the housing. As shown in FIG. 2A, 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. 2A, the connector cap 2 is movably attached to the side wall portion L1 of the housing 10 via a rod-like connecting member CM and a guide member GM for guiding 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. 2B is a perspective view of the electronic device 1 in FIG. 2A viewed from another angle. In the example of FIGS. 2A and 2B, when the connector cap 2 and the connecting member CM are pushed in the direction of the arrow A20, the connecting member CM is stored inside the housing 10 through the hole TH of the guide member GM. 2 is attached to the side wall L1 of the housing 10 (see also FIG. 1A).

  3A and 3B are enlarged views showing the vicinity of the connector cap 2 in FIGS. 2A and 2B, respectively. 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. An annular 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 facing the housing 10 includes a contact surface 210 formed so as to contact the receiving surface S on the housing 10 side when the connector cap 2 is attached to the housing 10. It is out. As shown in FIG. 3B, the contact 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 seal member 23 is locked in an annular groove formed on the outer peripheral surface of the protruding portion 22, and when the protruding portion 22 is fitted inside the insertion hole I, the outer peripheral surface of the protruding portion 22 and the insertion hole I It plays the role of sealing between the inner peripheral surface. The seal member 23 can be formed of a rubber material such as silicon rubber or nitrile rubber, for example.

  3A, the receiving surface S of the housing 10 described above has a shape corresponding to the contact 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 S 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 S 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 a second conductive portion 32 installed in a predetermined pattern on the lid portion 21 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 S of the housing 10 in FIG. 3A. As shown in FIG. 4A, the first conductive portion 31 installed in the housing 10 includes first and second electrode portions E1 and E2 disposed on both sides of the insertion hole I in the longitudinal direction of the housing 10. It is out. 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 S. The first and second electrode portions E1, E2 are electrically separated from each other.

  4B is a plan view showing the contact surface 210 of the connector cap 2 in FIG. 3B. As shown in FIG. 4B, the second conductive portion 32 installed on the connector cap 2 faces the first and second electrode portions E1 and E2 when the connector cap 2 is attached to the housing 10. Includes third and fourth electrode portions E3 and E4. The third and fourth electrode portions E3 and E4 have the same size and shape and are located on the same plane parallel to the contact surface 210 of the lid portion 21. 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 capacitance changes according to the mounting state of the connector cap 2 to the housing 10. The variable capacitor will be described in detail with reference to FIGS. 5A, 5B, 7 and the like.

  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, E2 are arranged inside the groove formed in the receiving surface S of the housing 10, and the depth of the groove of the receiving surface S is the first depth. It is made larger than the thickness of the 1st and 2nd electrode parts E1 and E2. Similarly, the third and fourth electrode portions E3 and E4 are disposed inside the groove formed in the contact surface 210 of the connector cap 2, and the depth of the groove of the contact surface 210 is the third depth. And it is made larger than the thickness of 4th electrode part E3, E4. Therefore, even if the contact surface 210 of the connector cap 2 is in contact with the receiving surface S of the housing 10 as shown in FIG. 5A, the first and second electrode portions E1 and E2 on the housing 10 side are connected to the connector cap 2. There is no contact with the third and fourth electrode portions E3 and E4 on the side.

Hereinafter, the distance in the depth direction between the first electrode portion E1 and the third electrode portion E3 is referred to as an interelectrode distance dwp. 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 dwp. That is, when the connector cap 2 is mounted on the housing 10, the contact surface 210 of the connector cap 2 is always maintained in a posture parallel to the receiving surface S of the housing 10. Generally, the capacitance C of a 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 decreases as the interelectrode distance dwp increases. In this example, a capacitor on the left side in the figure formed from the first and third electrode portions E1 and E3 and a capacitor on the right side formed from the second and fourth electrode plates E2 and E4 are connected in series. The connected composite capacitor is treated as the variable capacitor. In the state of FIG. 5A, the value of the interelectrode distance dwp is dwp = dwp0, and the value of the capacitance Cwp of the variable capacitor is Cwp = Cwp0. 5A, the contact surface 210 of the connector cap 2 is in contact with the receiving surface S of the housing 10 and the seal member 23 of the connector cap 2 is in close contact with the inner peripheral surface of the insertion hole I. The sealing property of the hole I is ensured to the maximum. That is, FIG. 5A shows an example of a state in which the connector cap 2 is properly attached to the housing 10. In particular, FIG. 5A shows a state in which the connector cap 2 is most appropriately mounted.

  FIG. 5B is a cross-sectional view similar to FIG. 5A, and shows a mounting state of the connector cap 2 different from FIG. 5A. More specifically, the contact surface 210 of the connector cap 2 is in contact with the receiving surface S of the housing 10 in the state of FIG. 5A, whereas the contact surface of the connector cap 2 is in the state of FIG. 5B. The surface 210 is separated from the receiving surface S of the housing 10 in the direction opposite to the depth direction. However, since the seal member 23 of the connector cap 2 is in close contact with the inner peripheral surface of the insertion hole I even in the state of FIG. 5B, the sealing performance of the insertion hole I is sufficiently ensured. That is, FIG. 5B shows another example of a state in which the connector cap 2 is properly attached to the housing 10 as in FIG. 5A. Since the interelectrode distance dwp1 in FIG. 5B is larger than the interelectrode distance dwp0 in FIG. 5A (dwp1> dwp0), the capacitance Cwp1 of the variable capacitor in FIG. 5B is the capacitance Cwp0 of the variable capacitor in FIG. (Cwp1 <Cwp0).

  The value (dwp1) of the interelectrode distance dwp in FIG. 5B is an example of the upper limit value of the interelectrode distance dwp that represents a state in which the connector cap 2 is properly attached. That is, when the connector cap 2 in FIG. 5B further moves in the direction opposite to the depth direction, the seal member 23 does not adhere to the inner peripheral surface of the insertion hole I, so that the sealing performance of the insertion hole I is not sufficiently ensured. . Hereinafter, such a state may be referred to as a state in which the connector cap 2 is erroneously attached. In the electronic device 1 of the present embodiment, the resonance frequency of the resonance circuit including the variable capacitor is detected, and the mounting state of the connector cap 2 is determined based on the detected value of the resonance frequency. Hereinafter, such a determination process may be referred to as a mounting determination process. Details of the mounting determination process will be described later with reference to FIGS.

  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 receives a user's operation, and includes a capacitive or resistive touch panel built in the display panel DP (see FIGS. 1A and 1B 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 (see FIGS. 1A and 1B and the like). 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 and 5B, the first to fourth electrode portions E1 to E4 are variable capacitors whose capacitance Cwp changes according to the mounting state of the connector cap 2 to the housing 10. Forming.

  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 FIGS. 2A and 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 supply E of the resonance circuit 181 resonance circuit 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 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 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 Cwp of the variable capacitor 4 is Cwp = Cwp0. On the other hand, the second waveform W2 in FIG. 8 shows a change in the detection signal G corresponding to the connector cap 2 in FIG. 5B. That is, the second waveform W2 shows the change of the detection signal G when the value of the capacitance Cwp of the variable capacitor 4 is Cwp = Cwp1 (Cwp1 <Cwp0). As can be seen from Equation (2) above, the resonance frequency f of the RLC resonance circuit is inversely proportional to the square root of the capacitance C of the capacitor. That is, since the resonance frequency f increases as the capacitance C decreases, the resonance frequency fr1 of the resonance circuit 181 corresponding to the wearing state of FIG. 5B is larger than the resonance frequency fr0 corresponding to the wearing state of FIG. 5A. .

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 dwp increases, the electrostatic capacitance Cwp of the variable capacitor 4 decreases, and as a result, the resonance frequency fr of the resonance circuit 181 increases.

  Referring again to FIG. 6, the resonance frequency detection circuit 18 of the electronic device 1 determines whether 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 reference value. It has the function to judge. Specifically, the resonance frequency detection circuit 18 determines whether or not the detection value of the resonance frequency fr exceeds the reference value. For example, the resonance frequency detection circuit 18 can employ the value (fr1) of the resonance frequency fr corresponding to the interelectrode distance dwp1 in FIG. 5B as the reference value. As described above, when the inter-electrode distance dwp between the housing 10 and the connector cap 2 is within the range from the value (dwp0) in FIG. 5A to the value (dwp1) in FIG. A sufficient sealing property is secured. Therefore, when the detected value of the resonance frequency fr is equal to or less than the value (fr1) corresponding to the interelectrode distance dwp1 in FIG. 5B (when fr ≦ fr1), the resonance frequency detection circuit 18 causes the connector cap 2 to be attached to the housing 10. It is determined that it is properly worn.

  On the other hand, when the inter-electrode distance dwp between the housing 10 and the connector cap 2 is larger than the value (dwp1) in FIG. 5B, the sealing performance 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 (fr1) corresponding to the interelectrode distance dwp1 in FIG. 5B (when fr> fr1), 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 reference value of the resonance frequency fr used for the above determination is 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 reference value in the storage unit 14 when performing the above determination. 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.

  Next, the mounting 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 illustrated in FIG. 9, in step S <b> 901, the resonance frequency detection circuit 18 reads the reference value (fr <b> 1) 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 exceeds the reference value (fr1) read in step S901.

  When the detected value of the resonance frequency fr exceeds the reference value (fr1) (YES in step S903), the resonance frequency detection circuit 18 sends an output signal indicating that the connector cap 2 is erroneously attached to the processor 11. It is transmitting (step S904). The processor 11 transmits a predetermined control signal to the display unit 16 in response to the output signal of the resonance frequency detection circuit 18. 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 mounting determination process ends (return). On the other hand, when the detected value of the resonance frequency fr is equal to or lower than the reference value (fr1) (NO in step S903), the procedure after step S902 is executed again. The above loop is repeatedly executed at a predetermined cycle. Note that the above attachment 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 mounting state of the connector cap 2 on the housing 10 based on a comparison between the detected value of the resonance frequency fr and a predetermined reference value (fr1). Here, the resonance frequency fr of the resonance circuit 181 increases as the capacitance Cwp of the variable capacitor 4 decreases, and the capacitance Cwp of the variable capacitor 4 increases the distance dwp between the electrodes of the housing 10 and the connector cap 2. Decreases as Therefore, according to the electronic apparatus of the present embodiment, it is possible to accurately determine whether the inter-electrode distance dwp between the housing 10 and the connector cap 2 is equal to or less than a predetermined upper limit value. It is possible to accurately determine whether or not is properly attached to the housing 10.

  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. 10A to 16 and the like. In particular, the structure of the housing 10 of the electronic apparatus 1 of the present embodiment is the same as the above-described examples of FIGS. 2A and 3A.

  FIG. 10A is a plan view illustrating the receiving surface S of the housing 10 of the electronic device 1 according to the present embodiment. As shown in FIG. 10A, the first conductive portion 31 installed in the housing 10 includes first and second electrode portions E1 and E2 disposed on both sides of the insertion hole I in the longitudinal direction of the housing 10. It is out. The structures of the first and second electrode portions E1 and E2 are the same as those in the example of FIG. 4A described above.

  FIG. 10B is a plan view illustrating the contact surface 210 of the connector cap 2 of the electronic device 1 according to the present embodiment. FIG. 10C is a plan view illustrating the upper surface 211 of the lid portion 21 of the connector cap 2 of the electronic apparatus 1 according to the present embodiment. The upper surface 211 of the lid 21 refers to the surface of the lid 21 facing away from the contact surface 210. As shown in FIGS. 10B and 10C, the second conductive portion 32 installed in the connector cap 2 is respectively connected to the first and second electrode portions E1 and E2 when the connector cap 2 is attached to the housing 10. 3rd and 4th electrode part E3, E4 arrange | positioned so that it may oppose is included.

  As shown in FIGS. 10B and 10C, the second conductive portion 32 further includes fifth and sixth electrode portions E <b> 5 and E <b> 6 installed at the center portion in the longitudinal direction of the connector cap 2. The fifth electrode portion E5 is electrically connected to the third electrode portion E3 by a first connection portion EC1 extending along the longitudinal direction of the connector cap 2. Similarly, the sixth electrode portion E6 is electrically connected to the fourth electrode portion E4 by a second connection portion EC2 extending along the longitudinal direction of the connector cap 2. The fifth and sixth electrode portions E5 and E6 are both built in the lid portion 21 of the connector cap 2 and are perpendicular to the upper surface 211 of the lid portion 21 (the direction perpendicular to the paper surface of FIGS. 10B and 10C). ) Are separated from each other. The fifth and sixth electrode portions E5 and E6 are examples of a pair of electrode portions in the electronic device according to the present application.

  FIG. 11A 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. 11A shows a cross section of the housing 10 and the connector cap 2 along the line XI-XI in FIGS. 10A to 10C. In FIG. 10A, 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. The structures of the first to fourth electrode portions E1 to E4 of the electronic apparatus 1 of the present embodiment, the receiving surface S of the housing 10, and the contact surface 210 of the connector cap 2 are the examples of FIGS. 5A and 5B described above. It is the same. Therefore, even if the contact surface 210 of the connector cap 2 is in contact with the receiving surface S of the housing 10 as shown in FIG. 11A, the first and second electrode portions E1 and E2 on the housing 10 side are connected to the connector cap 2. There is no contact with the third and fourth electrode portions E3 and E4 on the side. Hereinafter, the distance in the depth direction between the first electrode portion E1 and the third electrode portion E3 is referred to as a first inter-electrode distance dwp. The distance in the depth direction between the second electrode portion E2 and the fourth electrode portion E4 is equal to the first inter-electrode distance dwp.

  Similar to the example of FIGS. 5A and 5B, the first to fourth electrode portions E1 to E4 of the electronic device 1 form a variable capacitor whose capacitance decreases as the first inter-electrode distance dwp increases. ing. Hereinafter, this variable capacitor is referred to as a first variable capacitor. In this example, a composite including a left capacitor in the figure formed from the first and third electrode portions E1 and E3 and a right capacitor formed from the second and fourth electrode plates E2 and E4. The capacitor is handled as the first variable capacitor. The two capacitors are connected in series with a second variable capacitor described later interposed therebetween.

  In the state of FIG. 11A, the value of the first interelectrode distance dwp is dwp = dwp0, and the value of the capacitance Cwp of the first variable capacitor is Cwp = Cwp0. 11A, the contact surface 210 of the connector cap 2 is in contact with the receiving surface S of the housing 10, and the seal member 23 of the connector cap 2 is in close contact with the inner peripheral surface of the insertion hole I. The sealing property of the hole I is ensured to the maximum. That is, FIG. 11A shows a state in which the connector cap 2 is most appropriately mounted, as in FIG. 5A.

  FIG. 11B is a cross-sectional view similar to FIG. 11A, and shows a mounting state of the connector cap 2 different from FIG. Specifically, in the state of FIG. 11B, the contact surface 210 of the connector cap 2 is separated from the receiving surface S of the housing 10 in the direction opposite to the depth direction. However, since the sealing member 23 of the connector cap 2 is in close contact with the inner peripheral surface of the insertion hole I even in the state of FIG. 11B, the sealing performance of the insertion hole I is sufficiently ensured. That is, FIG. 11B shows another example of a state in which the connector cap 2 is properly attached, as in FIG. 5B. The capacitance Cwp1 of the first variable capacitor in FIG. 11B is smaller than the capacitance Cwp0 of the first variable capacitor in FIG. 11A (Cwp1 <Cwp0). The value (dwp1) of the first inter-electrode distance dwp in FIG. 11B is an example of the upper limit value of the inter-electrode distance dwp that represents a state in which the connector cap 2 is properly attached. That is, if the connector cap 2 in FIG. 11B further moves in the direction opposite to the depth direction, the sealing performance of the insertion hole I is not sufficiently ensured.

  As shown in FIG. 11A and FIG. 11B, the connector cap 2 further includes a pressing portion 24 installed at the portion of the lid portion 21 exposed from the housing 10 after being attached to the housing 10. The pressing portion 24 of the connector cap 2 is made of a material having moderate elasticity, and is formed to be deformed when pressed by a user's fingertip or the like. In the electronic apparatus 1 of the present embodiment, the pressing portion 24 of the connector cap 2 serves as a pressing switch that receives a predetermined operation from the user. The push switch realized by the push unit 24 is, for example, a power switch for switching on / off the power of the electronic device 1 from the user. 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.

  As shown in FIGS. 11A and 11B, the connector cap 2 has a cavity H located between the fifth electrode portion E5 and the sixth electrode portion E6. The cavity H is filled with air. The fifth and sixth electrode portions E5 and E6 are formed such that the shortest distance dsw between them decreases as the pressing portion 24 of the connector cap 2 is pressed and deformed. In particular, the sixth electrode portion E6 is formed to be elastically curved and deformed toward the fifth electrode portion E5 as the pressing portion 24 of the connector cap 2 is pressed and deformed. That is, the fifth and sixth electrode portions E5 and E6 form a variable capacitor whose capacitance changes in accordance with the pressed state of the pressing portion 24 of the connector cap 2.

  Hereinafter, the shortest distance dsw between the fifth and sixth electrode portions E5 and E6 is referred to as a second inter-electrode distance dsw. The variable capacitor formed by the fifth and sixth electrode portions E5 and E6 is referred to as a second variable capacitor. As will be described later with reference to FIG. 12, the second variable capacitor is connected in series with the first variable capacitor. 11A and 11B, the value of the second interelectrode distance dsw is dsw = dsw0, and the value of the capacitance Csw of the second variable capacitor is Csw = Csw0. 11A and 11B, the pressing portion 24 of the connector cap 2 is not pressed at all.

  11C is a cross-sectional view similar to FIG. 11A and shows a state of the pressing portion 24 of the connector cap 2 different from FIG. 11A. Specifically, in the state of FIG. 11C, the pressing portion 24 is pressed toward the housing 10, and therefore the sixth electrode plate E6 is curved and deformed toward the fifth electrode plate E5. As a result, the second interelectrode distance dsw1 in FIG. 11C is smaller than the second interelectrode distance dsw0 in FIG. 11A (dsw1 <dsw0). That is, the capacitance Csw1 of the second variable capacitor in FIG. 11C is larger than the capacitance Csw0 of the second variable capacitor in FIG. 11A (Csw1> Csw0). However, in the state of FIG. 11C, since the amount of pressing of the pressing unit 24 is insufficient, a user operation on the pressing unit 24 has not yet been accepted.

  The value (dsw1) of the second inter-electrode distance dsw in FIG. 11C is an example of a lower limit value of the second inter-electrode distance dsw that represents a state where a user operation on the pressing unit 24 is not accepted. That is, in the electronic apparatus 1 of the present embodiment, it is considered that the user's operation on the pressing unit 24 is accepted when the second inter-electrode distance dsw is less than the value (dsw1) in FIG. 11C. . Since the pressing portion 24 and the fifth electrode plate E5 are both made of an elastic material, when the external force on the pressing portion 24 is removed, both the pressing portion 24 and the sixth electrode plate E6 are in the state shown in FIG. 11A. Will return. In the electronic apparatus 1 according to the present embodiment, the resonance frequency of the resonance circuit including the combined capacitor of the first and second capacitors is detected, and the mounting state of the connector cap 2 and the pressing unit 24 based on the detected value of the resonance frequency. The pressed state of is determined. Hereinafter, such a determination process may be referred to as a state determination process. Details of the state determination process will be described later with reference to FIGS.

  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 sixth electrode parts E1 to E6. As described with reference to FIGS. 11A to 11C, the first to fourth electrode portions E1 to E4 have a first capacitance Cwp that changes according to the mounting state of the connector cap 2 to the housing 10. A variable capacitor is formed. The fifth and sixth electrode portions E5 and E6 form a second variable capacitor whose capacitance Csw changes according to the pressed state of the pressing portion 24 of the connector cap 2.

  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. 12 is a circuit diagram of the resonance circuit 182 of the resonance frequency detection circuit 18 in the electronic apparatus 1 of this embodiment. As shown in FIG. 12, the resonance circuit 182 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. The resonance circuit 182 includes a composite capacitor 40 formed by connecting the 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. 12 correspond to points a and b in the housing 10 in FIGS. 2A and 3A, respectively.

  FIG. 13 is a graph showing a correspondence relationship between the frequency f of the AC power source E of the resonance circuit 182 of FIG. 12 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 182 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 182. ing.

  A first waveform W1 in FIG. 13 shows a change in the detection signal G corresponding to the connector cap 2 in FIG. 11A. In other words, the first waveform W1 is obtained when the value of the capacitance Cwp of the first variable capacitor 41 is Cwp = Cwp0 and the value of the capacitance Csw of the second variable capacitor 42 is Csw = Csw0. The change in the detection signal G is shown. A second waveform W2 in FIG. 13 shows a change in the detection signal G corresponding to the connector cap 2 in FIG. 11B. That is, in the second waveform W2, the value of the capacitance Cwp of the first variable capacitor 41 is Cwp = Cwp1 (Cwp1 <Cwp0), and the value of the capacitance Csw of the second variable capacitor 42 is Csw. = Change of detection signal G when Csw0. The resonance circuit 182 of FIG. 12 is formed such that the resonance frequency fr increases as the capacitance Cwp of the first variable capacitor 41 decreases. Therefore, the resonance frequency fr1 of the resonance circuit 182 corresponding to the state of FIG. 11B is higher than the resonance frequency fr0 corresponding to the state of FIG. 11A.

  Subsequently, a third waveform W1 in FIG. 13 shows a change in the detection signal G corresponding to the connector cap 2 in FIG. 11C. That is, in the third waveform W3, the value of the capacitance Cwp of the first variable capacitor 41 is Cwp = Cwp0, and the value of the capacitance Csw of the second variable capacitor 42 is Csw = Csw1 ( The change of the detection signal G when Csw1> Csw0) is shown. The resonance circuit 182 of FIG. 12 is formed such that the resonance frequency fr decreases as the capacitance Csw of the second variable capacitor 42 increases. For this reason, the resonance frequency fr2 of the resonance circuit 182 corresponding to the state of FIG. 11C is smaller than the resonance frequency fr0 corresponding to the state of FIG. 11A.

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 first interelectrode distance dwp increases, the capacitance C of the composite capacitor 40 decreases, and as a result, the resonance frequency fr of the resonance circuit 182 increases. Further, when the second interelectrode distance dsw decreases, the capacitance C of the composite capacitor 40 increases, and as a result, the resonance frequency fr of the resonance circuit 182 decreases.

  Subsequently, the resonance frequency detection circuit 18 of the electronic device 1 according to the present embodiment performs the operation on the pressing portion 24 of the connector cap 2 based on the comparison between the detection value of the resonance frequency fr and a predetermined second reference value. It has a function of further determining the presence or absence of an operation. Specifically, the resonance frequency detection circuit 18 determines whether or not the detected value of the resonance frequency fr is lower than the second reference value. For example, the resonance frequency detection circuit 18 can employ the value (fr2) of the resonance frequency corresponding to the second interelectrode distance dsw1 in FIG. 11C as the second reference value. When the second inter-electrode distance dsw is within the range of the value (dsw0) in FIG. 11A to the value (dsw1) in FIG. 11C, the amount of deformation of the pressing part 24 and the sixth electrode part E6 is insufficient. The operation on the pressing unit 24 is not accepted. Therefore, when the detected value of the resonance frequency fr is equal to or larger than the value (fr2) corresponding to the second interelectrode distance dsw1 in FIG. 11C (when fr ≧ fr2), the resonance frequency detection circuit 18 operates the pressing unit 24. Is not accepted.

  On the other hand, when the detected value of the resonance frequency fr falls below the value (fr2) corresponding to the second interelectrode distance dsw1 in FIG. 11C (when fr <fr2), the resonance frequency detection circuit 18 operates the pressing unit 24. Has been accepted. 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. Then, the resonance frequency detection circuit 18 reads and temporarily stores the first and second reference values in the storage unit 14 at the time of executing the above series of determinations. 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. 14 is a flowchart illustrating the procedure of the state determination process executed in the electronic apparatus 1 according to the present embodiment. As shown in FIG. 14, in step S1401, 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 S1402, the resonance frequency detection circuit 18 detects the resonance frequency fr of the resonance circuit 182 in FIG. In step S1403, the resonance frequency detection circuit 18 determines whether or not the value of the resonance frequency fr detected in step S1402 is lower than the second reference value (fr2) read in step S1401.

  If the detected value of the resonance frequency fr is lower than the second reference value (fr2) (YES in step S1403), the resonance frequency detection circuit 18 outputs an output signal indicating that an operation on the pressing unit 24 has been accepted. Is transmitted to the processor 11 (step S1404). In response to the output signal transmitted in step S1404, 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 S1404. Next, the vibration generating unit 17 generates a vibration for notifying the user that an operation on the pressing unit 24 has been accepted 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 second reference value (fr2) (NO in step S1403), the flowchart proceeds to step S1405 described later. In step S1405, the resonance frequency detection circuit 18 determines whether or not the value of the resonance frequency fr detected in step S1402 exceeds the first reference value (fr1) read in step S1401.

  When the detected value of the resonance frequency fr exceeds the first reference value (fr1) (YES in step S1405), the resonance frequency detection circuit 18 outputs an output signal indicating that the connector cap 2 is erroneously attached. This is transmitted to the processor 11 (step S1406). The processor 11 transmits a predetermined control signal to the display unit 16 in response to the output signal transmitted in step S1406. 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 first reference value (fr1) (NO in step S1405), the procedure after step S1402 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 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 first reference value (fr1). doing. As described above, the resonance frequency fr increases as the first inter-electrode distance dwp increases. Therefore, according to the electronic apparatus 1 of the present embodiment, it can be accurately determined whether or not the first inter-electrode distance dwp is equal to or less than the predetermined upper limit value. It is possible to accurately determine whether or not the device has been properly attached.

  Further, in the electronic apparatus 1 of the present embodiment, the resonance frequency detection circuit 18 performs an operation on the pressing portion 24 of the connector cap 2 based on the comparison between the detection value of the resonance frequency fr and the second reference value (fr2). Judgment is made. As described with reference to FIG. 13, the resonance frequency fr decreases as the second inter-electrode distance dsw decreases (that is, as the pressing amount of the pressing portion 24 by the user increases). Therefore, according to the electronic apparatus of the present embodiment, it is possible to accurately determine whether or not the pressing amount of the pressing unit 24 is sufficient, and as a result, whether or not an operation on the pressing unit 24 is accepted accurately. Can be determined.

  Subsequently, a modified example of the pressing portion 24 of the connector cap 2 will be described. FIG. 15 is a perspective view showing the electronic apparatus 1 to which the modified example of the pressing unit 24 is applied. As shown in FIG. 15, the pressing portion 24 of the connector cap 2 of this example includes a convex portion 241 that protrudes toward the outside of the housing 10 when the connector cap 2 is attached to the housing 10. It is out. The convex part 241 of the pressing part 24 may have a shape of a partial sphere disposed on the upper surface 211 of the lid part 21. According to the connector cap 2 of this example, it becomes easy to specify the position of the pressing portion 24 on the upper surface 211 of the lid portion 21, so that the operability of the pressing portion 24 can be improved. Further, as a result of improving the operability of the pressing unit 24, it is possible to prevent a user's operation mistake due to an insufficient pressing amount of the pressing unit 24.

  16 is a cross-sectional view similar to FIG. 11A, showing the housing 10 and the connector cap 2 in FIG. As shown in FIG. 16, the pressing portion 24 of the connector cap 2 of this example can include an elastic member 242 partially disposed inside the convex portion 241. The elastic member 242 may be disposed completely inside the convex portion 241. As shown in FIG. 16, the elastic member 242 is a dome-shaped leaf spring that protrudes in the same direction as the convex portion 241, and is deformed together with the convex portion 241 when the convex portion 241 is pressed by the user. It is formed to do. According to the connector cap 2 of this example, when the convex portion 241 is pressed, the elastic member 242 gives a good click feeling to the user's fingertip or the like via the convex portion 241. Can be further improved.

  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.

(Appendix 1) A housing and a cap that can be 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 including a variable capacitor formed from the first conductive portion and the second conductive portion;
A detection circuit that detects a resonance frequency of the resonance circuit and determines whether the cap is attached to the housing based on a comparison between a predetermined reference value of the resonance frequency and a detection value of the resonance frequency; An electronic device.

(Additional remark 2) The said housing | casing has the insertion hole for a connection with an external apparatus,
The electronic device according to appendix 1, wherein the cap is formed so as to cover the insertion hole when attached to the housing.
(Additional remark 3) The said detection circuit memorize | stores the value of the said resonance frequency corresponding to the state in which the said cap was suitably mounted | worn to the said housing | casing as the said reference value,
The electronic device according to appendix 1 or 2, wherein the detection circuit determines that the cap is not attached to the housing when the detection value exceeds the reference value.
(Appendix 4) The cap is
A pressing part that is installed in a portion exposed from the casing when mounted on the casing and is formed to be deformed when pressed;
A pair of electrode portions that are arranged apart from each other and formed such that the distance between them decreases when the pressing portion is pressed and deformed;
Another variable capacitor including the pair of electrode portions,
The resonant circuit includes a synthetic capacitor formed by connecting the variable capacitor in series with the other variable capacitor,
Whether the detection circuit has received a user's operation on the pressing unit based on a comparison between another predetermined reference value different from the reference value of the resonance frequency and the detection value of the resonance frequency The electronic device according to any one of appendices 1 to 3, further determining

(Additional remark 5) The said detection circuit uses the value of the said resonance frequency corresponding to the state in which the said cap is mounted | worn appropriately to the said housing | casing, and the user's operation with respect to the said pressing part is not received as said other reference value Remember as
The electronic device according to appendix 4, wherein the detection circuit determines that a user operation on the pressing unit is accepted when the detection value is lower than the other reference value.
(Additional remark 6) The said pressing part is an electronic device of Additional remark 4 or 5 containing the convex-shaped part which protrudes toward the outer side of the said housing | casing, when the said connector cap is mounted | worn with the said housing | casing.
(Additional remark 7) The said pressing part is an elastic member which is arrange | positioned at least partially inside the said convex-shaped part, and deform | transforms with the said convex-shaped part when the said convex-shaped part is pressed down The electronic device according to appendix 6, further comprising:

(Additional remark 8) The said elastic member is an electronic device of Additional remark 7 which is a dome-shaped leaf | plate spring which protrudes in the same direction as the said convex-shaped part.
(Additional remark 9) The electronic device in any one of additional marks 4-8 whose operation of the user with respect to the said press part is operation for switching ON / OFF of the power supply of the said electronic device.
(Additional remark 10) User's operation with respect to the said pressing part is operation for operating the application mounted in the imaging device incorporated in the said housing | casing, or the said electronic device in any one of additional marks 4-8 The electronic device described.

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 182 Resonance circuit 2 Connector cap 21 Lid part 210 Contact surface 211 Upper surface 22 Projection portion 23 Seal member 24 Pressing portion 241 Convex portion 242 Elastic member 31 First conductive portion 32 Second conductive portion 4 Variable capacitor 41 First variable capacitor 42 Second variable capacitor 40 Synthetic capacitor I insertion hole CM connecting member DP display panel GM guide member TH hole F front wall part R rear wall part S receiving surface P power button L1 side wall part L2 side wall part E1 first electrode part E2 second electrode part E3 third Electrode part E4 Fourth electrode part E5 Fifth electrode part E6 Sixth electrode part EC contact Part EC1 first connecting portion EC2 second connecting portion

Claims (7)

A housing,
A cap attachable 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 including a variable capacitor formed from the first conductive portion and the second conductive portion;
A detection circuit that detects a resonance frequency of the resonance circuit and determines whether the cap is attached to the housing based on a comparison between a predetermined reference value of the resonance frequency and a detection value of the resonance frequency; An electronic device. The detection circuit stores, as the reference value, a value of the resonance frequency corresponding to a state in which the cap is properly attached to the housing.
The electronic device according to claim 1, wherein the detection circuit determines that the cap is not attached to the housing when the detection value exceeds the reference value. The cap is
A pressing part that is installed in a portion exposed from the casing when mounted on the casing and is formed to be deformed when pressed;
A pair of electrode portions that are arranged apart from each other and formed such that the distance between them decreases when the pressing portion is pressed and deformed;
Another variable capacitor including the pair of electrode portions,
The resonant circuit includes a synthetic capacitor formed by connecting the variable capacitor in series with the other variable capacitor,
Whether the detection circuit has received a user's operation on the pressing unit based on a comparison between another predetermined reference value different from the reference value of the resonance frequency and the detection value of the resonance frequency The electronic device according to claim 1, wherein the electronic device is further determined. The detection circuit stores, as the other reference value, the value of the resonance frequency corresponding to a state in which the cap is properly attached to the housing and a user operation on the pressing unit is not accepted.
The electronic device according to claim 3, wherein the detection circuit determines that a user's operation on the pressing portion is accepted when the detection value is lower than the other reference value.   The electronic device according to claim 3, wherein the pressing portion includes a convex portion that protrudes toward the outside of the housing when the cap is attached to the housing.   The pressing portion further includes an elastic member that is disposed at least partially inside the convex portion and is formed to deform together with the convex portion when the convex portion is pressed. The electronic device according to claim 5.   The electronic device according to claim 6, wherein the elastic member is a dome-shaped leaf spring protruding in the same direction as the convex portion.

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