JP2011233235A - Portable terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable terminal which can remove external noise current suitably.SOLUTION: Earth terminals 53a-53d are provided, respectively, for all outer surfaces 11a-11d extending along the longitudinal direction of a case 11, and formed at such parts as the earth terminals come into contact with a mounting surface, e.g. a workbench or the desk surface, when a portable terminal 10 is mounted thereon with the outer surface as the undersurface so that the earth terminals are exposed. The earth terminals 53a-53d are connected electrically with a negative side charging terminal 52 by means of conductive parts 54a-54d.

Description

  The present invention relates to a portable terminal whose connection terminal is exposed to the outside.

  2. Description of the Related Art Conventionally, a card-type gate terminal shown in Patent Document 1 below is known as a technique related to removal of noise current from the outside of an electronic device, for example, static noise or lightning surge noise. This gate terminal is arranged in the middle of the card path between the card insertion slot and the subsequent card reader / writer so as to contact the card passing through the card path as a means for removing static electricity charged in the card. A ground electrode is provided, and the static electricity charged in the card inserted from the card insertion slot is discharged to the ground electrode in the middle of transportation to be removed from the card. Thereby, the card is sent to the card reader / writer in a state where static electricity is not charged, and troubles such as malfunction caused by static electricity are avoided.

Japanese Patent Laid-Open No. 08-007048

  By the way, in the stationary type electronic device (terminal), since the arrangement relationship with the grounding surface such as the ground is determined, the structure for releasing the noise current to the ground via the grounding electrode and the grounding surface as described above can be easily performed. Can be configured. However, in a portable terminal, since the user often does not know how to place the terminal on the ground surface or the like, the ground terminal is not provided. For this reason, it is necessary to provide a device for discharging the noise current in the housing, assuming that the noise current flows into the housing via the connection terminals exposed to the outside, etc. There was a problem that there was.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a portable terminal capable of suitably removing noise current from the outside.

  In order to achieve the above object, in the portable terminal according to claim 1, the connection terminal for electrically connecting to an external device is exposed to the outside along the longitudinal direction of the casing. A ground terminal provided for each outer surface, and when the mobile terminal is mounted on the mounting surface with the outer surface as a lower surface, a ground terminal exposed at a portion in contact with the mounting surface, and the connection terminal On the other hand, a conductive portion for electrically connecting each of the ground terminals is provided.

  According to a second aspect of the present invention, in the portable terminal according to the first aspect, the conductive portion is arranged so as to linearly connect the connection terminal and the ground terminal.

  According to a third aspect of the present invention, in the portable terminal according to the first or second aspect, the ground terminals exposed on adjacent surfaces of all the outer surfaces are electrically connected to each other so as to be close to each other. Only one of the terminals is electrically connected to the connection terminal through the conductive portion.

  A fourth aspect of the present invention is the portable terminal according to any one of the first to third aspects, further comprising a buffer member that covers and protects a part of the housing, and at least one of the ground terminals. Is exposed from an opening formed in the buffer member.

  Invention of Claim 5 is a portable terminal as described in any one of Claims 1-4. WHEREIN: The said connection terminal is a pair of charge terminal, Comprising: One charge terminal is the said through each said conduction | electrical_connection part. Each of the charging terminals is connected to each ground terminal, and the one charging terminal and the other charging terminal are capacitively coupled by a capacitor.

  In the first aspect of the present invention, the ground terminal is provided for every outer surface along the longitudinal direction of the casing, and the portable terminal is mounted on a mounting surface such as a work table or a desk surface with the outer surface as a lower surface. When it is placed, it is formed so as to be exposed to a portion that comes into contact with the placement surface. And each grounding terminal is electrically connected with respect to the connection terminal by each conduction | electrical_connection part, respectively.

  Thereby, when mounting the said portable terminal on a mounting surface, at least any one of each said ground terminal will contact the said mounting surface. Since the ground terminal that contacts in this way is connected to the connection terminal via the conduction part, the noise current that flows into the connection terminal is discharged from the ground terminal that contacts the placement surface via the conduction part. The noise current from the outside can be preferably removed.

  In the invention of claim 2, since the conducting portion is arranged so as to linearly connect the connecting terminal and the ground terminal, the connection distance between the connecting terminal and the ground terminal is shortened, and the impedance of the conducting portion is reduced. The noise current can easily flow through the conduction part, and the noise current from the outside can be removed more reliably.

  In the invention of claim 3, the ground terminals exposed on the adjacent surfaces of all the outer surfaces are electrically connected in close proximity to each other, and only one of these ground terminals is connected via the conducting portion. Electrically connected to the terminal. Thereby, since it is only necessary to connect one conducting part to the ground terminals provided on the two adjacent surfaces, the routing of the conducting part is simplified and the manufacturing cost can be reduced.

  In the invention of claim 4, at least one of the ground terminals is exposed from an opening formed in the buffer member that protects the housing. Since the buffer member is configured to surely contact the mounting surface when the portable terminal is mounted on the mounting surface, the grounding terminal is exposed from the opening formed in the buffer member, thereby The ground terminal and the mounting surface can be reliably brought into contact with each other.

  In the invention of claim 5, since one charging terminal constituting the connection terminal is connected to each grounding terminal via each conducting portion, and this one charging terminal and the other charging terminal are capacitively coupled by the capacitor. The removal of noise current from the outside can be suitably performed not only on one charging terminal but also on the other charging terminal.

1 is a perspective view schematically illustrating a mobile terminal according to a first embodiment of the present invention. FIG. 2A is a block diagram schematically illustrating the electrical configuration of the mobile terminal in FIG. 1, and FIG. 2B is an explanatory diagram illustrating the configuration of the information code reading unit. FIG. 3 (A) is an explanatory view showing the rear side face with the cushioning rubber attached, and FIG. 3 (B) is an explanatory view showing the rear side face with the cushioning rubber removed. It is explanatory drawing which shows the state which mounted the said portable terminal on the mounting surface by making a right side surface into a lower surface. It is a perspective view which shows the portable terminal which concerns on the modification of 1st Embodiment. It is explanatory drawing which shows the principal part of the portable terminal which concerns on 2nd Embodiment of this invention, FIG. 6 (A) shows the rear side in the state which attached the rubber | gum for buffering, FIG.6 (B) is buffering The rear side is shown with the rubber for use removed.

[First Embodiment]
Hereinafter, a first embodiment in which a portable terminal of the present invention is embodied will be described with reference to the drawings. FIG. 1 is a perspective view schematically illustrating the mobile terminal 10 according to the first embodiment of the present invention. FIG. 2A is a block diagram schematically illustrating the electrical configuration of the mobile terminal 10 in FIG. 1, and FIG. 2B is an explanatory diagram illustrating the configuration of the information code reading unit 30. FIG. 3A is an explanatory view showing the rear side surface 11e with the buffer rubber 60 attached, and FIG. 3B is an explanatory view showing the rear side surface 11e with the buffer rubber 60 removed. FIG.

  A portable terminal 10 shown in FIG. 1 is carried by a user and used in various places, and has a function as an information code reader that reads an information code such as a barcode and a two-dimensional code, an optical communication function, and the like. ing.

  As shown in FIG. 1, the mobile terminal 10 is configured in a longitudinal shape as a whole, and an outer casing is formed by the longitudinal casing 11, and various components (such as various electrical components) are provided in the casing 11. Is housed. The housing | casing 11 is comprised by the some case body which consists of resin materials etc., for example, and has comprised the box shape form which these couple | bonded. In the first embodiment, the longitudinal direction of the housing 11 is the front-rear direction, and the side on which charging terminals 51 and 52 described later are formed is the rear side, and the opposite side is the front side. In addition, the thickness direction of the casing 11 is the vertical direction, and the side on which the key operation unit 14 and the display device 13 are provided is the upper side, and the opposite side is the lower side. In addition, a direction orthogonal to the front-rear direction and the up-down direction is a left-right direction. That is, the housing 11 is formed in a substantially box shape by four outer surfaces (upper side surface 11a, lower side surface 11b, left side surface 11c and right side surface 11d) along the longitudinal direction, and the front side surface and the rear side surface 11e.

  A reading port for taking in reflected light from the information code is formed on the front side of the housing 11. The reading port has an opening shape capable of taking light into the housing 11, and the opening is closed by a transparent member (for example, a transparent resin member). Also, the mobile terminal 10 is provided with various components in a form exposed from the housing 11. For example, a display device 13 and a key operation unit 14 having a plurality of operation buttons (numerical keys, function keys, etc.) are provided on the upper side surface 11a, and reading instructions are provided on the left side surface 11c and the right side surface 11d. For example, a trigger switch 15 (not shown in FIG. 1) is provided.

  Next, an electrical configuration will be described. As shown in FIG. 2A, a control unit 20 that controls the entire mobile terminal 10 is provided inside the housing 11 of the mobile terminal 10. The control unit 20 is composed mainly of a microcomputer, has a CPU, a system bus, an input / output interface, and the like, and functions as information processing means in cooperation with the memory 21. The control unit 20 is also connected to a display device 13, a key operation unit 14, a trigger switch 15, an external interface 16, and the like.

  The display device 13 is configured, for example, as a liquid crystal display, and various display operations are performed in response to commands from the control unit 20. The key operation unit 14 and the trigger switch 15 are configured to give an operation signal to the control unit 20, and the control unit 20 receives various operation signals from these and performs various controls according to the contents of the operation signal. . The external interface 16 is configured as an interface for performing data communication with the outside (for example, a host device), and is configured to perform communication processing in cooperation with the control unit 20. In addition, a battery 17 and a power supply unit 18 serving as a power source are provided in the housing 11, and power is supplied to the control unit 20 and various electric components by these.

  An information code reading unit 30 is connected to the control unit 20. As shown in FIG. 2B, the information code reading unit 30 includes a light receiving sensor 33 such as a CCD area sensor, an imaging lens 37, an illumination unit 31 including a plurality of LEDs and lenses, and the like. It has a configuration and functions to read the information code C (bar code or two-dimensional code) attached to the reading object R in cooperation with the control unit 20.

  When the information code reading unit 30 performs reading, first, the illumination light Lf is emitted from the illumination unit 31 that has been instructed by the control unit 20, and the illumination light Lf is irradiated to the reading object R through the reading port. . The reflected light Lr reflected by the illumination light Lf by the information code C (bar code or two-dimensional code) is taken into the apparatus through the reading port, and enters the light receiving sensor 33 through the imaging lens 37. . The imaging lens 37 disposed between the reading port and the light receiving sensor 33 is configured to form an image of the information code C on the light receiving sensor 33, and the light receiving sensor 33 converts the image of the information code C to the image of the information code C. The corresponding light reception signal is output. The light receiving signal output from the light receiving sensor 33 is stored as image data in the memory 21 (FIG. 2A) and used for decoding processing. The information code reading unit 30 is provided with an amplifier circuit that amplifies the signal from the light receiving sensor 33, an AD converter circuit that converts the amplified signal into a digital signal, and the like. Is omitted.

  Further, an IrDA unit 40 is connected to the control unit 20. The IrDA unit 40 is configured as an interface for performing optical wireless data communication using a standardized well-known IrDA communication method. An optical communication element (IrDA communication module) having a light emitting element and a light receiving element is provided behind the housing 11. It is arranged so that optical wireless data communication is possible through an optical communication window 41 provided on the side surface 11e.

  As shown in FIGS. 3A and 3B, a pair of flat charging terminals (a positive charging terminal 51 and a negative charging terminal) are provided in the vicinity of the optical communication window 41 on the rear side surface 11 e of the housing 11. The terminal 52) is disposed so as to be exposed to the outside. Both the charging terminals 51 and 52 function as a path for supplying power from the outside of the housing 11 to the battery 17. The charging terminals 51 and 52 are capacitively coupled by a capacitor. The positive charging terminal 51 and the negative charging terminal 52 may correspond to an example of a “connection terminal” or “a pair of charging terminals” recited in the claims.

  Further, a flat ground terminal 53a on the rear side, that is, in the vicinity of the rear side surface 11e, of the upper side surface 11a, the lower side surface 11b, the left side surface 11c, and the right side surface 11d, which are four outer surfaces along the longitudinal direction of the housing 11, is provided. To 53d are provided so as to be exposed. Each of the ground terminals 53a to 53d is electrically connected to the negative charging terminal 52 via flat conductive portions 54a to 54d disposed on the rear side surface 11e (see FIG. 3). In addition, each conduction | electrical_connection part 54a-54d may be arrange | positioned in the housing | casing 11. FIG.

  A buffer for protecting the portable terminal 10 from an impact such as dropping by covering the rear side of the casing 11 except for the optical communication window 41 and the charging terminals 51 and 52 on the rear side of the casing 11. A rubber 60 is attached. Thereby, when mounting the portable terminal 10 on mounting surfaces, such as a desk surface, any one of the up-and-down side surface and the left and right side surfaces of the buffer rubber 60 comes into contact with the mounting surface. The buffer rubber 60 may correspond to an example of a “buffer member” described in the claims.

  As shown in FIG. 3A, the cushioning rubber 60 is provided with openings 60a to 60d on the upper and lower side surfaces and the left and right side surfaces, respectively. The openings 60a to 60d are formed so that the corresponding ground terminals 53a to 53d are exposed from the openings 60a to 60d, respectively, when the cushioning rubber 60 is attached to the rear side of the housing 11. In FIG. 1, for the sake of convenience, the illustration of the ground terminals 53 a to 53 d, the conduction portions 54 a to 54 d, and the openings 60 a to 60 d is omitted.

FIG. 4 is an explanatory diagram showing a state in which the mobile terminal 10 is placed on the placement surface S with the right side surface 11d as the bottom surface.
Therefore, for example, as illustrated in FIG. 4, when the mobile terminal 10 is placed on the placement surface S with the right side surface 11 d as a lower surface, the right side surface of the cushioning rubber 60 contacts the placement surface S. The ground terminal 53d exposed from the right side also comes into contact with the placement surface S. Since the ground terminal 53d that contacts in this way is connected to the negative charging terminal 52 via the conducting portion 54d, the noise current that has flowed into the negative charging terminal 52 is applied to the placement surface S via the conducting portion 54d. It will be discharged from the ground terminal 53d which contacts.

  As described above, in the mobile terminal 10 according to the first embodiment, the ground terminals 53a to 53d are connected to all outer surfaces (upper side surface 11a, lower side surface 11b, left side surface 11c, and the like along the longitudinal direction of the housing 11). It is provided for each of the right side surfaces 11d), and is exposed to a portion in contact with the mounting surface S when the mobile terminal 10 is mounted on the mounting surface S, for example, a work table or a desk surface, with the outer surface as the lower surface. It is formed as follows. The grounding terminals 53a to 53d are electrically connected to the negative charging terminal 52 by the conductive portions 54a to 54d, respectively.

  As a result, the noise current flowing into the negative charging terminal 52 is discharged from any of the ground terminals 53a to 53d that are in contact with the placement surface S via any of the conductive portions 54a to 54d. The removal of the current can be preferably performed.

  In the mobile terminal 10 according to the first embodiment, the ground terminals 53 a to 53 d are exposed from the openings 60 a to 60 d formed in the buffer rubber 60 that protects the housing 11. Thereby, since the rubber | gum 60 for buffering contacts the mounting surface S reliably when mounting the portable terminal 10 in the mounting surface S, it is each from opening part 60a-60d formed in this rubber | gum 60 for buffering. By exposing the ground terminals 53a to 53d, any one of the ground terminals 53a to 53d and the placement surface S can be reliably brought into contact with each other.

  Further, in the mobile terminal 10 according to the first embodiment, since the positive charging terminal 51 and the negative charging terminal 52 are capacitively coupled by a capacitor, not only the negative charging terminal 52 but also the positive charging terminal 51 is connected. On the other hand, noise current from the outside can be preferably removed. The ground terminals 53a to 53d are not limited to being electrically connected to the negative charging terminal 52 via the conducting portions 54a to 54d, but are connected to the positive charging terminal 51 via the conducting portions 54a to 54d. Each may be electrically connected. In this case as well, when the positive charging terminal 51 and the negative charging terminal 52 are capacitively coupled by a capacitor, noise current from the outside is removed not only to the positive charging terminal 51 but also to the negative charging terminal 52. It can implement suitably.

FIG. 5 is a perspective view showing a mobile terminal 10 according to a modification of the first embodiment.
As a modification of the first embodiment, the grounding terminals 53 a to 53 d are not limited to being exposed from the openings 60 a to 60 d, and a part or the whole of the grounding terminals 53 a to 53 d is not protected by the buffer rubber 60. You may arrange | position in the site | part which contacts. Specifically, for example, as illustrated in FIG. 5, the ground terminal 53 d is not protected by the buffer rubber 60 and may be disposed at a portion that contacts the placement surface S when the right side surface 11 d is the bottom surface. Alternatively, depending on the shape of the housing 11, the other grounding terminal may be disposed at a portion that contacts the placement surface S without being protected by the buffer rubber 60.

  When the cushioning rubber 60 is not adopted, the ground terminals 53a to 53d are in contact with the placement surface S when the portable terminal 10 is placed on the placement surface S with the outer surfaces 11a to 11d being the lower surface. It is arranged in each part to do.

[Second Embodiment]
Next, a mobile terminal according to a second embodiment of the present invention will be described with reference to FIG. FIG. 6 is an explanatory view showing the main part of the mobile terminal 10 according to the second embodiment of the present invention. FIG. 6 (A) shows the rear side surface 11e with the cushioning rubber 61 attached. 6 (B) shows the rear side surface 11e with the cushioning rubber 61 removed.

  In the mobile terminal 10 according to the second embodiment, each ground terminal, each conduction portion, and the buffer rubber are different from those in the first embodiment. Specifically, the ground terminal 53a and the ground terminal 53c provided on the adjacent upper side surface 11a and left side surface 11c are electrically connected in close proximity to each other, and are connected to the negative side charge terminal 52 via the conduction portion 54c. ing. Further, a ground terminal 53b and a ground terminal 53d provided on the adjacent lower side surface 11b and right side surface 11d are connected to each other and electrically connected to the negative charge terminal 52 via a conduction portion 54d. In the second embodiment, the conduction portions 54a and 54b employed in the first embodiment are omitted.

  Further, when the buffer rubber 61 is attached to the rear side of the housing 11, an opening 61a is formed so that the ground terminal 53a and the ground terminal 53c are exposed, and the ground terminal 53b and the ground terminal 53d are exposed. An opening 61b is formed.

  As a result, it is only necessary to connect one conducting portion to two ground terminals provided on two adjacent surfaces, so that the routing of the conducting portion is simplified and the manufacturing cost can be reduced. The ground terminal 53a and the ground terminal 53d provided on the adjacent upper side surface 11a and the right side surface 11d may be connected to the negative charging terminal 52 through one conductive portion, or may be adjacent to the lower side surface. 11b and the ground terminal 53b and the ground terminal 53c provided on the left side surface 11c may be close to each other and connected to the negative charge terminal 52 through one conductive portion.

The present invention is not limited to the above embodiments, and may be embodied as follows. Even in this case, the same operations and effects as those of the above embodiments can be obtained.
(1) Each of the ground terminals 53a to 53d is not limited to being connected to the pair of charging terminals 51 and 52 via the conducting portions 54a to 54d, but to be electrically connected to an external device such as an external connection connector. It may be connected to a connection terminal exposed to the outside. As a result, the noise current flowing into the connection terminal is discharged from any of the ground terminals 53a to 53d that are in contact with the mounting surface S via any of the conductive portions 54a to 54d. The removal can be suitably performed.

(2) Each conduction part 54a-54d may be arrange | positioned so that the corresponding ground terminal and the negative side charging terminal 52 may be connected linearly. Here, the linear connection includes a case where both terminals are connected at the shortest distance along the outer surface of the casing 11 and a case where both terminals are disposed within the casing 11 and are connected at the shortest distance. And As a result, the connection distance between the corresponding ground terminal and the negative charging terminal 52 is shortened and the impedance of the conduction part is reduced, so that the noise current easily flows through the conduction part, and the noise current from the outside can be further removed. It can be implemented reliably.

(3) Instead of the buffer rubbers 60 and 61, a buffer member made of an elastic material may be used to protect the mobile terminal 10 from an impact such as dropping.

(4) When the housing 11 is composed of three or five or more outer surfaces along the longitudinal direction, a grounding terminal is provided for every outer surface, and each grounding terminal has the outer surface as a lower surface. When the terminal is placed on the placement surface S, the terminal is formed so as to be exposed at a portion in contact with the placement surface S. In addition, each of these ground terminals is connected to the negative charging terminal 52 via a conducting portion. Even in this case, the noise current flowing into the negative charging terminal 52 is discharged from the ground terminal that contacts the mounting surface S through any of the conductive portions, so that it is preferable to remove the noise current from the outside. Can be implemented.

DESCRIPTION OF SYMBOLS 10 ... Portable terminal 11 ... Portable terminal 11a ... Upper side surface 11b ... Lower side surface 11c ... Left side surface 11d ... Right side surface 11e ... Rear side surface 51 ... Positive side charging terminal (connection terminal, other charging terminal)
52 ... Negative charging terminal (connecting terminal, one charging terminal)
53a to 53d ... grounding terminals 54a to 54d ... conduction part 60, 61 ... rubber for buffering (buffering member)
60a-60d, 61a, 61b ... opening S ... mounting surface

Claims (5)

In a mobile terminal where a connection terminal for electrical connection with an external device is exposed to the outside,
Grounding terminals provided on every outer surface along the longitudinal direction of the casing, and grounding exposed at a portion in contact with the mounting surface when the portable terminal is mounted on the mounting surface with the outer surface as a lower surface A terminal,
A conductive portion for electrically connecting each ground terminal to the connection terminal;
A portable terminal comprising:   The mobile terminal according to claim 1, wherein the conductive portion is arranged to linearly connect the connection terminal and the ground terminal.   The ground terminals exposed on the adjacent surfaces of all the outer surfaces are electrically connected to each other in proximity to each other, and only one of these ground terminals is electrically connected to the connection terminal via the conductive portion. The mobile terminal according to claim 1, wherein the mobile terminal is connected to the mobile terminal. Comprising a cushioning member that covers and protects part of the housing;
The mobile terminal according to claim 1, wherein at least one of the ground terminals is exposed from an opening formed in the buffer member.   The connection terminals are a pair of charge terminals, and one charge terminal is connected to each ground terminal via each conduction portion, and the one charge terminal and the other charge terminal are capacitively coupled by a capacitor. The mobile terminal according to claim 1, wherein the mobile terminal is a mobile terminal.

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