JP5980699B2 - Mobile device - Google Patents

Description

  The present invention relates to a mobile terminal, and more particularly to a mobile terminal in which an antenna is formed on a surface of a member that is detachable from a housing.

  Some mobile phones in which a loop antenna pattern is laid out on a battery cover have a structure in which the battery cover can be removed and the battery removed. Specifically, a power supply terminal for non-contact communication such as NFC (Near Field Communication) or FeliCa (registered trademark) protrudes from the terminal main body, and a contact portion is connected to a loop antenna preprinted on the battery lid. It is configured to connect via Short-range wireless communication (non-contact wireless communication) such as NFC or FeliCa is performed with the battery cover closed.

  In this structure, even when the lid is not closed, there is a state where the power is turned on, so if the lid is not closed unintentionally or if the lid is not attached, FeliCa or NFC There is a possibility that a shortcoming that short-range wireless communication (non-contact wireless communication) cannot be performed may occur.

  In order to solve such a problem, Patent Document 1 (Japanese Patent Laid-Open No. 9-74687) discloses that when a battery cover is opened, the battery cover opening / closing switch detects this, and before the battery is taken out, Similar to when the operation permission switch is turned off, a method has been proposed for the control unit to quickly terminate the currently executing process. Patent Document 2 (Japanese Patent Application Laid-Open No. 2011-254546) proposes a method that can appropriately notify the opening / closing of a cover according to the usage status of the terminal device when the opening / closing of the cover is detected.

JP-A-9-74687 JP 2011-254546 A

  However, in the structure of Patent Document 1, a loop antenna must be formed on the battery lid, and the lid opening / closing switch section must be attached, resulting in high costs. Further, since the connection portion of the loop antenna and the battery lid opening / closing switch portion are separately provided, when the lid is not completely closed, the presence / absence of connection of the loop antenna and the opening / closing judgment of the battery lid opening / closing switch portion do not completely coincide. Therefore, even when it is determined that the battery cover is attached, there may be a problem that short-range wireless communication (contactless wireless communication) including contactless charging cannot be performed. This problem cannot be solved even by the method of Patent Document 2.

  Therefore, an object of the present invention is to provide a portable terminal capable of detecting whether or not the lid is attached to the main body with a simple configuration.

  A portable terminal according to an aspect of the present invention includes a main body unit that includes a communication unit and a control unit, a lid that is detachably attached to the main body unit and includes an antenna unit, an antenna-side terminal on the antenna unit side, and a main body A body-side terminal that is connected to the antenna-side terminal when the lid is attached to the body portion. The control unit includes a port that receives the voltage of the output line of the predetermined voltage source, and a determination unit that determines whether or not the lid is attached to the main body from the potential received via the port, and the output line When the lid is attached to the main body, the connection is made between the antenna side terminal and the main body terminal, and is blocked when the lid is not attached.

  According to the invention, it is possible to detect whether or not the lid is attached to the main body from the potential of the port that changes depending on whether or not the antenna-side terminal and the main body terminal are connected.

It is a block block diagram of the terminal which concerns on Embodiment 1 of this invention. It is a block block diagram of the terminal which concerns on Embodiment 2 of this invention. It is a block block diagram of the terminal which concerns on Embodiment 3 of this invention. FIG. 5 is a diagram for describing the feature of the first embodiment. FIG. 5 is a diagram for describing the feature of the first embodiment. FIG. 10 is a diagram for illustrating the feature of the third embodiment. FIG. 10 is a diagram for illustrating the feature of the third embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals indicate the same or corresponding parts. In each embodiment, it is assumed that the mobile terminal performs communication including non-contact charging in a state where the lid is attached to the main body.

<Embodiment 1>
In the first embodiment, in a portable terminal that forms a loop antenna on a lid, whether or not the loop antenna is connected is used for lid attachment detection.

  FIG. 1 is a block configuration diagram of mobile terminal 100 (hereinafter referred to as terminal 100) according to Embodiment 1 of the present invention. A housing of the terminal 100 includes a main body portion and a lid body shown in FIG. The main body portion incorporates circuit components such as a battery and various circuits, and the lid is detachably attached to the main body portion so as to cover the circuit components. For example, the lid body is attached to the main body portion so as to be openable and closable by a slide type or a hinge type. Here, the lid body is mainly attached around the battery portion, and therefore may be referred to as a battery lid.

  Referring to FIG. 1B, the circuit board of the main unit has a terminal control LSI (Large Scale Integration) 101 for controlling the terminal 100, for non-contact near field communication such as NFC or FeliCa. An IC (Integrated Circuit) 102 and contacts A1 and A2 for antenna connection are included. The contacts A1 and A2 are power supply terminals for non-contact communication and have a protruding convex shape.

  The terminal control LSI 101 includes a processor such as a CPU (Central Processing Unit) 111, a memory, an output unit 112, and a power supply unit 113 that controls power supply to each unit. Further, when the lid is attached to the main body so as to cover the internal circuit, the contact formed on the loop antenna 103 and the loop antenna pattern formed by printing and plating on the surface facing the internal circuit side B1 and B2. The contacts A1, A2, B1 and B2 are arranged such that when the lid is completely attached so as to cover the internal circuit of the main body, each of the contacts B1 and B2 on the lid side and each of the contacts A1 and A2 on the main body side It is formed in a position where it comes into contact with each other and has a shape that makes contact with each other. When the contacts come into contact with each other, the two can be made conductive, and communication including non-contact charging using the loop antenna 103 becomes possible. The IC 102 charges an internal battery (not shown) by non-contact charging by communication using the loop antenna 103.

  Further, in the circuit board of the main body, the capacitor C1 is connected in series in the middle of the path connecting the contact A1 and the IC 102, and the capacitor C2 is connected in series in the middle of the path connecting the contact A2 and the IC 102. Capacitors C1 and C2 are provided to cut a DC signal component. However, when no DC signal is included, capacitors C1 and C2 may be unnecessary if the voltage relationship between voltages V1 and V2 is not affected.

  A node N1 is connected to a node N3 in the middle of the capacitor C1 and the contact A1 via a resistor R1. A voltage V1 is applied to the node N3. A node N4 in the middle of the capacitor C2 and the contact A2 is connected to the ground side via resistors R2 and R3 connected in series. Further, the terminal control LSI 101 is connected to a node N2 that is an intermediate point between the resistors R2 and R3.

  Here, the voltage V1 is assumed to be a fixed voltage value (1.8V or 3V) of a predetermined voltage source such as a general regulator output, and the resistors R1, R2, and R3 affect the short-range non-contact wireless communication. Select a resistance value that will not be affected. For example, when the voltage V1 = 3 V, the values of the resistors R1 and R2 are values that do not affect the FeliCa or NFC communication operation, for example, about 1 MΩ. If the value of the resistor R3 is also 1 MΩ, the detection voltage V2 of the node N2 becomes 1V when the battery cover is completely attached to the main body so as to cover the internal circuit, and the battery cover is opened incompletely. When detected, the detection voltage V2 = 0V. Note that the voltage for guaranteeing the operation of the terminal control LSI 101 (referred to as a threshold voltage) is set to a value that is greater than 0 V and less than or equal to 1 V, which is the potential of the node N2. The resistor R3 is used to prevent the voltage of the node N2 from becoming unstable when the battery lid is incompletely attached to the main body (or removed), but the condition that does not become unstable is prepared. If it is, the resistor R3 is not necessary.

  In operation, N1 → N3 → A1 → B1 → Loop when the battery cover is completely attached to the main body, that is, when the contact A1 and the contact B1 are connected and the contact A2 and the contact B2 are connected. The electric circuit of the antenna 103 → B2 → A2 → N4 → R2 → N2 → R3 → ground is established, and the voltage of the node N2 is V2 = R3 / (R1 + R2 + R3) × V1. That is, the divided potential obtained by dividing the voltage of the output line of the predetermined voltage source at the node N1 by the voltage dividing resistors (R1, R2, R3) is received by the input port P of the terminal control LSI 101. When the circuit is established, the IC 102 communicates via the loop antenna 103, and the terminal control LSI 102 operates with a threshold voltage supplied from the port P.

  On the other hand, when the battery cover is not completely attached to the main body or is not attached, the antenna connection part of A1 → B1 → loop antenna 103 → B2 → A2 in the above circuit will be missing, The output line of the predetermined voltage source at the node N1 is cut off at the connection portion. As a result, the resistance divided potential of the node N2 received by the port P shows the ground potential of 0V. When the connection portion is missing, the IC 102 cannot communicate via the loop antenna 103, and the port P of the terminal control LSI 102 cannot receive the threshold voltage and cannot operate. When the CPU 111 of the terminal control LSI 101 detects the voltage V2 of the node N2 received by the port P and determines that V2 = 0V, the CPU 111 controls the output unit 112 so as to notify the lid open / close state based on the determination result. The power supply unit 113 is controlled to shut down the power supply. The output unit 112 outputs a message such as “Please confirm opening / closing of the lid” on a display (not shown), or outputs a predetermined sound through a speaker (not shown).

  Thereby, when the battery cover is completely attached to the main body, wireless communication is possible, and the problem that wireless communication including non-contact charging cannot be performed even though the cover is attached can be prevented.

<Embodiment 2>
The type of antenna can be realized even if it is not the loop antenna of the first embodiment. In the second embodiment, in terminal 100A in which a communication antenna for high-frequency signals is printed on a battery lid, whether or not the antenna is connected is used for lid attachment detection.

  FIG. 2 is a block configuration diagram of terminal 100A according to Embodiment 2 of the present invention. The casing of the terminal 100A includes a main body and a battery lid. The lid is detachably attached to the main body in the same manner as in the first embodiment.

  Referring to FIG. 2, the circuit board of the main body includes a terminal control LSI 101, a wireless circuit 102 </ b> A for wireless communication such as non-contact charging and data communication using RF (Radio Frequency) communication, and communication on the main body side. Contact A1 and contact A22. The contacts A1 and A22 are communication power supply terminals and have a protruding convex shape. The terminal control LSI 101 includes a CPU 111, a memory, an output unit 112, and a power supply unit 113 as in the first embodiment. Further, when the lid is attached to the main body so as to cover the internal circuit, the pattern of the antenna 103A formed by printing and plating and the contact B1 of the lid side antenna and the contact are formed on the surface facing the internal circuit side. B22.

  When the lid is completely attached to the main body, the contact B1 and the contact B22 on the lid side come into contact with the contact A1 and the contact A22 on the main body side, respectively, and both are in a conductive state. The contacts A1, A22, B1 and B22 have a shape for ensuring contact between the contacts when the lid is completely attached to the main body, and are formed at positions for ensuring contact. .

  Further, in the circuit board of the main body, a capacitor C1 is connected in series in the middle of the path connecting the contact A1 and the radio circuit 102A, and the node N3 in the middle of the capacitor C1 and the contact A1 is connected via the coil or resistance unit 40. Node N1 is connected. Further, the contact A22 on the main body side is connected to the ground side via a coil or resistor portion 41 and a resistor R3 connected in series. The terminal control LSI 101 is connected to a node N2 between the coil or resistance unit 41 and the resistor R3.

  Here, the voltage V1 applied to the node N1 is assumed to be a fixed voltage value (1.8 V or 3 V) such as a general regulator output as in the first embodiment, and the coil or resistance units 40, 41 and A value that does not affect high-frequency communication is set for the resistor R3. The resistor R3 is used to prevent the voltage at the node N2 from becoming unstable. However, the resistor R3 is not necessary when conditions that do not make it unstable are satisfied. The value of the capacitor C1 in FIG. 2 is smaller than the capacitor C1 in FIG. 1 used in the antenna such as FeliCa, NFC of the first embodiment, and is specifically assumed to be about 100 pF.

  Since the coil or resistance portions 40 and 41 have a high impedance value in the second embodiment, they have a function of cutting high-frequency components. Specifically, when communicating using the antenna 103A, the coil or resistance unit 40 functions to prevent a high frequency component of a communication signal passing through the node N3 from being input to the node N1 side. Similarly, when the contact B22 and the contact A22 are connected and become conductive, the coil or resistance unit 41 inputs the high frequency component of the communication signal from the antenna 103A from the contact A22 to the node N2 side via the connection unit. It works to prevent you from doing. As a result, the communication signal is not impaired due to attenuation.

  Also in the present embodiment, similarly to the first embodiment, when the battery cover is completely attached to the main body so as to cover the internal circuit, the voltage V2 = 1V which is the resistance divided potential of the node N2 received by the port P is 1V. When the battery cover is removed or the attachment is incomplete, the voltage V2 = 0V. Specifically, when the fixed voltage V1 of the node N1 is set to 3V, and the coil or resistance unit 40 = 1MΩ, the coil or resistance unit 41 = 1MΩ, and R3 = 1MΩ, the voltage is obtained when the lid is completely attached. When V2 = 1V, and when the lid is not completely attached or removed, the voltage V2 = 0V.

  In addition, when both the coil or resistance portions 40 and 41 are set to 100 nH and the resistance R3 = 1 MΩ, the voltage V2 = 3V when the lid is completely attached, and the lid is not completely attached or detached. When it is, it becomes 0V.

  In operation, when the battery cover is completely attached to the main body, that is, when the contact A1 and the contact B1 are connected and the contact A22 and the contact B22 are connected, N1 → coil or resistor 40 → N3. → A1 → B1 → antenna 103A → B22 → A22 → coil or resistor 41 → N2 → R3 → the voltage V2 = R3 / (coil which is the resistance divided potential of the node N2 received by the port P is established. or resistance portion 40 + coil or resistance portion 41) × V1. When the circuit is established, the wireless circuit 102A communicates via the antenna 103A, and in the case of non-contact charging, an internal battery (not shown) is charged by a received signal. Further, the terminal control LSI 101 operates by being supplied with a threshold voltage from the port P.

  On the other hand, when the battery cover is not completely attached to the main body or is not attached, the antenna connection part of A1 → B1 → antenna 103A → B22 → A22 in the electric circuit is lacking, The output line of the predetermined voltage source at the node N1 is cut off at the connection portion. As a result, the resistance divided potential of the node N2 received by the port P shows the ground potential of 0V. At this time, the radio circuit 102A cannot communicate via the antenna 103A, and the terminal control LSI 101 cannot operate because the threshold voltage is not supplied. When the CPU 111 of the terminal control LSI 101 detects the voltage V2 at the node N2 and determines that V2 = 0V, the CPU 111 controls the output unit 112 and the power supply unit 113 in the same manner as in the first embodiment.

  Thereby, when it is determined that the battery cover is completely attached to the main body, wireless communication including non-contact charging is possible, and the problem that the wireless communication cannot be performed even though the cover is attached can be prevented.

<Embodiment 3>
Unlike the first embodiment, in the third embodiment, unlike the first embodiment, the terminal 100B that prints the loop antenna 103 on the battery lid, as in the first embodiment, for communication including non-contact charging on the loop antenna 103. Are provided for contact detection and lid contact not used for communication, and the latter contact is used for detecting attachment of the lid.

  FIG. 3 is a block configuration diagram of terminal 100B according to Embodiment 3 of the present invention. The casing of terminal 100B includes a main body and a battery lid, and this lid is detachably attached to the main body in the same manner as in the first embodiment.

  Referring to FIGS. 3A and 3B, the circuit board of the main body has a terminal control LSI 101 for controlling the terminal 100, an IC 102, contacts A1 and A2 for communication, and lid attachment detection. Contact points A3 and A4. These contacts have a protruding convex shape.

  The lid has a pattern of the loop antenna 103, and contacts B1 and B2 used for communication formed on the pattern, and contacts B3 and B4 for detecting lid attachment. These four contacts B1, B2, B3 and B4 are formed close to each other on the loop antenna pattern, and the contacts B3 and B4 are short-circuited. When the lid is attached and the contacts B1 and B2 are connected to the contacts A and A2, the corresponding four contacts A1, A2, A3 and A4 are also connected to the circuit board so that the contacts B3 and B4 are connected to the contacts A3 and A4. It is formed in close proximity.

  When the lid is completely attached to the main body, the contacts B1 and B2 on the lid side come into contact with the contacts A1 and A2 on the main body, respectively, and both are in a conductive state, and the contact B3 on the lid side. And B4 come into contact with the contacts A3 and A4 on the main body side, respectively, and become conductive.

  Further, in the circuit board of the main body, the capacitor C1 is connected in series in the middle of the path connecting the contact A1 and the IC 102, and the capacitor C2 is connected in series in the middle of the path connecting the contact A2 and the IC 102. The contact A3 is connected to the node N1, and the contact A4 is connected to the ground side via a resistor R3 connected in series. The terminal control LSI 101 is connected to a node N2 between the contact A4 and the resistor R3. The resistor R3 is a voltage dividing resistor element that divides the voltage of the output line of the node N1, which is a predetermined voltage source. This is used to prevent the voltage of the node N2 being the potential divided by the resistor R3 from becoming unstable when the battery lid is incompletely attached to the main body (or removed). The resistor R3 is not necessary when the conditions that are not met are satisfied.

  Here, when the voltage V1 applied to the node N1 is assumed to be a fixed voltage value (1.8V or 3V) such as a general regulator output, the port P is set when the battery cover is completely attached to the main body. The voltage V2 = 1V, which is the resistance-divided potential of the node N2, is received, and the voltage V2 = 0V when mounted incompletely. Note that the voltage for guaranteeing the operation of the terminal control LSI 101 (referred to as a threshold voltage) is set to a value that is greater than 0 V and less than or equal to 1 V, which is the potential of the node N2.

  In operation, when the battery lid is completely attached to the main body, that is, the main body side contact A1 and the lid side contact B1 are connected, and the main body side contact A2 and the lid side contact B2 are connected, When the main body side contacts A3 and A4 are connected to the lid side contacts B3 and B4, an electric circuit of N1 → A3 → B3 → B4 → A4 → N2 → R3 → ground is established, and the node N2 received by the port P A voltage of V2 = 1V, which is a resistance divided potential of, is detected. When the electric circuit is established, the IC 102 communicates via the loop antenna 103, and the terminal control LSI 102 operates by being supplied with a threshold voltage.

  On the other hand, when the battery lid is not completely attached to the main body or is not attached, the connection portion of A3 → B3 or B4 → A4 in the electric circuit is missing, and the predetermined voltage source of the node N1 The output line is cut off at the connection portion, and the resistance divided potential of the node N2 received by the port P indicates 0 V of the ground potential. When the connection unit is absent, the CPU 111 of the terminal control LSI 101 detects the voltage V2 of the node N2 and determines that V2 = 0 V, and controls the output unit 112 and the power supply unit 113 in the same manner as in the first embodiment.

  When the attachment of the battery cover to the main body is incomplete or not attached, the connection between the contacts A1 and B1 or the connection between the contacts A2 and B2 is lost along with the lack of the connection part. Therefore, in such a case, communication using the loop antenna 103 is also impossible.

  In the third embodiment, when the contacts A3 and B3 are connected, and when the contacts A4 and B4 are connected, the contacts A1 and B1 are connected and the contacts A2 and B2 are connected as 4 terminals as loop antenna contacts. (B1 to B4) are provided. Thereby, when the battery cover is completely attached to the main body, wireless communication is possible, and it is possible to prevent the problem that wireless communication cannot be performed even though the cover is attached.

  Note that the antenna element portion may be formed by the following method in addition to the above-described printing / plating or printing. That is, the antenna element part is formed by a pattern of a metal material such as stainless steel (SUS), phosphor bronze, various platings (copper, nickel, gold), conductive metal paint, etc. Or the said metal may be integrally formed in the housing of the resin material. Alternatively, a metal pattern (plating) formed on an FPC (flexible printed circuit board) or a PET film may be used.

<Comparison>
The features of the first embodiment will be described in comparison with the configurations of FIGS. 4 and 5 are configuration diagrams of a portable terminal in which a loop antenna unit and a battery lid open / close detection switch S are separately provided. In FIGS. 4 and 5, the lid open / close detection switch S of the main body is pressed to change from open to closed due to the deflection of the battery lid itself when the battery lid is attached. At this time, the terminal control LSI determines whether or not the battery cover is attached to the main body from the change in the terminal voltage of the cover open / close detection switch S, but even when it is determined that the battery cover is attached. Depending on how the lid bends, the short-range non-contact communication antenna contacts A1, A2 and the contacts B1, B2 may not be connected. In order to avoid this, the main body portion of FIG. 5 needs to have a function of detecting connection of the contact points of the loop antenna and a lid opening / closing detection function using the switch S.

  On the other hand, in FIG. 1 of the first embodiment, the lid is attached to the main body by a simple circuit in which resistors R1, R2 and R3 are added instead of the special detection components such as the switch S of FIG. It is possible to detect both whether or not the connection is made and whether or not the contact points of the loop antenna are connected (that is, whether or not short-range non-contact communication is possible). Therefore, direct detection is possible at a lower cost than the configuration of FIG.

  The features of the third embodiment will be described in comparison with the configurations of FIGS. 6 and 7, the terminal control LSI is based on the premise that the contacts A3 and A4 of the lid open / close detection unit and the contacts B3 and B4 are connected by utilizing the deflection of the lid when attached to the main body. Whether or not the lid is attached to the main body is determined from the detection voltage of NN2 (regulator voltage of the node NN1 when attached, and 0 V of the ground potential when not attached). However, depending on how the lid is bent, the contacts A1 and A2 and the contacts B1 and B2 of the loop antenna for short-range non-contact communication may not be connected even when the attachment is detected.

  On the other hand, in FIG. 3B of the third embodiment, four contacts (contacts B1, B2, B3, and B4) are provided close to each other on the printed pattern of the loop antenna 103, of which the contacts B1 and B2 Is used for communication, and terminals that cannot be used for communication (short-circuited contacts B3 and B4) are used for detecting whether or not the lid is attached. Since the four terminals (contacts B1, B2, B3, and B4) are provided close to each other, when the lid is attached to the main body, the contacts A3 and B3 are connected, and the contacts A4 and B4 are connected, B1 connects and contacts A2 and B2 connect. Therefore, with the simple configuration of providing four terminals (contacts B1, B2, B3, and B4) close to each other, the problem remaining in the configuration of FIG. 5, that is, communication is not possible even when the lid is mounted. And the problem can be solved.

<Effect of Embodiment>
By detecting the presence / absence of connection between the antenna contacts formed on the battery lid also for the presence / absence detection of the lid attachment, the number of parts for detection can be reduced, and the cost and size of the terminal can be reduced. Moreover, even if the battery cover is attached to the main body, the problem that communication by an antenna cannot be performed can be solved.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  100 terminal, 101 terminal control LSI, 102 IC, 102A wireless circuit, 103 loop antenna, 103A antenna, 111 CPU, 112 output unit, 113 power supply unit, P port.

Claims (5)

A main body unit including a communication unit and a control unit;
A lid that is detachably attached to the main body and has an antenna;
The antenna side terminal on the antenna side,
A terminal on the main body side, the main body terminal connected to the antenna side terminal when the lid is attached to the main body, and
The controller is
A port for receiving the voltage of the output line of the predetermined voltage source;
A determination unit that determines whether the lid is attached to the main body from the potential received through the port,
The output line is a portable terminal that passes through a connection portion between the antenna-side terminal and the main body terminal when the lid is attached to the main body, and is blocked when the lid is not attached.   The mobile terminal according to claim 1, further comprising a voltage dividing resistor that inputs a divided potential obtained by dividing a voltage of an output line of the predetermined voltage source to the port.   The portable terminal according to claim 1, wherein the antenna unit is an antenna unit for short-range non-contact wireless communication. The antenna unit is an antenna unit for radio communication of high-frequency signals,
The mobile terminal according to claim 2, wherein the voltage dividing resistor includes an impedance unit for preventing a high frequency component from flowing into the output line.   The mobile terminal according to claim 1, wherein the control unit outputs a result of determination by the determination unit.

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