JP2020053911A - Wireless communication device - Google Patents

Abstract

To reduce deviation of a resonance frequency of an antenna in a wireless module substrate from a design value when the wireless module substrate is arranged so as to be substantially orthogonal to a main substrate.SOLUTION: A compound machine 10 has: a communication substrate 70 that has an antenna 73 and a ground; and a control substrate 90 that comprises a ground pattern formed on a substrate surface, and a connector 94 mounted on an end part of the substrate surface and electrically connected with the ground pattern. The communication substrate 70 is connected by the connector 94 so that a rear face 71 of the communication substrate 70 and the control substrate 90 are substantially orthogonal to each other. The connector 94 electrically connects between the ground and the ground pattern. The compound machine 10 further has a ground conductive member 80 arranged so as to surround a front face 72 side of the communication substrate 70 on an extension of the substrate surface of the control substrate 90 and that is conductive with the ground pattern.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a wireless communication device in which a wireless module substrate is provided on a main substrate having a ground pattern.

Conventionally, a device housing, a control board disposed in the device housing and provided with a control circuit for controlling the operation of the wireless communication device, and a control substrate disposed in the device housing and electrically connected to the control substrate via a connector There is a wireless communication device provided with a communication board that has been provided, and a ground conductive member that connects the control board and the communication board.
In this wireless communication device, since two types of substrates are accommodated in the device housing, it is desired that the device does not increase in size.
In response to the above, Patent Literature 1 discloses a technique in which a communication board is disposed at an end of a control board so as to be orthogonal to the control board.

JP-A-2015-191949

The characteristics of the antenna of the wireless module substrate are determined by the shape of the antenna and the shape of the ground connected to the antenna, and are designed so that a predetermined frequency characteristic is obtained as a single component by itself.
When mounting a wireless module board (corresponding to a communication board disclosed in Patent Document 1) on a wireless communication device, the wireless module board is disposed so as to be substantially orthogonal to a main board (corresponding to a control board described in Patent Document 1), and In some cases, one surface of the wireless module substrate is connected to a connector provided at the end, and the ground pattern of the main substrate and the ground of the wireless module substrate are connected via the connector.
In that case, a ground pattern provided on the main board exists on one side of the wireless module board where the wireless module board and the connector come into contact, but the wireless module board does not make contact with the connector. There is no ground pattern on the other surface side because there is no main substrate.
Therefore, since the ground pattern of the antenna of the wireless module substrate is asymmetric, there has been a problem that the resonance frequency of the antenna of the wireless module substrate may greatly deviate from the design value as a component of the wireless module substrate.

  An object of the present invention is to provide a wireless communication device that can reduce deviation of a resonance frequency of an antenna of a wireless module substrate from a design value when the wireless module substrate is arranged so as to be substantially orthogonal to a main substrate. .

  In order to achieve the above object, the present invention includes a wireless module substrate including an antenna and a ground, a ground pattern, and a connector mounted on an end of the substrate surface and electrically connected to the ground pattern. A main board, and the wireless module board is connected by the connector such that one surface of the wireless module board and the main board are substantially orthogonal to each other, and the connector includes the ground and the ground. A conductor that is electrically connected to the pattern and is disposed so as to surround the other surface of the wireless module substrate on an extension of the substrate surface of the main substrate, and is electrically connected to the ground pattern.

In this configuration, one surface of the wireless module substrate and the main substrate are connected by a connector so as to be substantially orthogonal to each other, and a conductor is provided so as to surround the other surface of the wireless module substrate on an extension of the substrate surface of the main substrate. Is arranged.
As a result, a ground made of a conductor can be arranged on the other surface side of the wireless module board provided at the end of the main board, so that the wireless module board provided orthogonal to the board surface of the main board can be provided. Changes in frequency characteristics can be reduced, and the resonance frequency of the antenna on the wireless module substrate can be prevented from greatly deviating from the design value.

  ADVANTAGE OF THE INVENTION According to this invention, when a wireless module board is arrange | positioned substantially orthogonally to a main board | substrate, it can reduce that the resonance frequency of the antenna of a wireless module board deviates from a design value.

FIG. 1 is a perspective view illustrating an appearance of a multifunction peripheral according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view schematically illustrating an internal configuration of a printer unit. FIG. 4 is a perspective view illustrating an arrangement of a ground conductive member near a connection portion between a communication board and a control board. It is a perspective see-through view showing the detailed structure of a communication board. FIG. 4 is a schematic top view illustrating an arrangement of a ground conductive member near a connection portion between a communication board and a control board. FIG. 9 is a schematic top view illustrating an arrangement of a ground conductive member near a connection portion between a communication board and a control board according to a second embodiment of the present invention. FIG. 11 is a schematic top view illustrating an arrangement of a ground conductive member near a connection portion between a communication board and a control board according to a modification in which the ground conductive member is fixed to a cover in advance. FIG. 9 is a schematic top view illustrating an arrangement near a connection portion between a communication board and a control board according to a third embodiment of the present invention, and a communication board and a control board in a comparative example in which the communication board is erected at an end of the control board. FIG. 4 is a schematic top view showing the arrangement near the connection portion.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First embodiment>
A first embodiment of the present invention will be described with reference to FIGS. In the following description, as shown in FIG. 1, the vertical direction 7 is defined based on a state in which the multifunction peripheral 10 is installed so as to be usable. The front-rear direction 8 is defined with the side on which the panel unit 110 is provided as the front surface of the multifunction peripheral 10. A left-right direction 9 is defined when the MFP 10 is viewed from the front side. The up-down direction 7, the front-back direction 8, and the left-right direction 9 are orthogonal to each other.

<Overview of MFP 10>
1 and 2, the multifunction peripheral 10 includes an apparatus housing 21 having a substantially rectangular parallelepiped appearance. The MFP 10 has functions such as printing, scanning, copying, and wireless communication with an external device. The multifunction peripheral 10 is an example of a wireless communication device.

  The multifunction peripheral 10 includes a panel unit 110, and the panel unit 110 is arranged on the front side of the device housing 21. A scanner unit 12 is provided at an upper part of the multifunction peripheral 10, and a printer unit 11 is provided at a lower part of the multifunction peripheral 10. The scanner unit 12 reads an image recorded on a document by an image sensor (not shown) and acquires image data. The printer unit 11 records an image on the sheet 6 stored in the sheet cassette 30.

  As shown in FIG. 2, the scanner section 12 is configured as a so-called flatbed scanner. The printer unit 11 includes a paper cassette 30, a feeding unit 40, a transport unit 50, a recording unit 60, and the like.

<Paper cassette 30>
The paper feed cassette 30 includes a main tray 31 that holds sheets 6 before image recording and a paper discharge tray 32 that holds sheets 6 after image recording. As shown in FIG. 1, the paper feed cassette 30 is arranged at a lower part of the apparatus housing 21. The paper feed cassette 30 can be inserted and removed through an opening 22 provided on the front surface of the device housing 21.

<Feeding part 40>
The feeding section 40 includes an arm 42 whose one end is rotatably supported by a support shaft 41. The arm 42 is provided with a plurality of gears 44 for transmitting the rotation of the support shaft 41 to the feed roller 43. When the support shaft 41 is rotated by a drive motor (not shown), the feed roller 43 rotates, and the sheet 6 is sent out to the transport path 51.

<Transport unit 50>
The transport unit 50 includes a guide member (not shown) and a platen 54 that configure the transport path 51, a transport roller pair 55, and a paper discharge roller pair 56. The transport path 51 includes a curved path 52 indicated by a one-dot chain line and a straight path 53 indicated by a two-dot chain line.

  The sheet 6 is intermittently conveyed on a platen 54 by a pair of conveyance rollers 55 and a pair of discharge rollers 56, and an image is recorded by the recording unit 60. The sheet 6 on which the image is recorded is discharged to the discharge tray 32 by the discharge roller pair 56.

<Recording unit 60>
The recording unit 60 includes a carriage 61 disposed above the platen 54, and a recording head 62 mounted on the carriage 61. The recording head 62 discharges the supplied ink as ink droplets onto the sheet 6 on the platen 54.

<Device housing 21>
The device housing 21 has a substantially rectangular parallelepiped appearance. As shown in FIG. 1, the front wall 33 constituting the front side of the rectangular parallelepiped is provided as a pair on both sides in the left-right direction 9. The panel portion 110 is fitted between the pair of front walls 33. The panel section 110 includes a rectangular parallelepiped box-shaped housing 111 that is thin in the front-rear direction 8. The input unit 113 and the display unit 114 are exposed to the outside through an opening (not shown) provided on the front surface 112 of the housing 111.

<Control board 90>
The multifunction device 10 includes a control board 90 shown in FIG. The control board 90 is made of glass epoxy, paper phenol, or the like, and is a printed board having a wiring pattern formed on at least the surface. The control board 90 is an example of a main board. The control board 90 is arranged so that its board surface 89 extends in the front-rear direction 8 and the left-right direction 9, in other words, is substantially parallel to the lower surface of the device housing 21. The board surface 89 is a surface on which a mounting component described later is mounted.

  The control board 90 is provided with a control circuit for controlling the operation of the MFP 10. On the board surface 89 of the control board 90, a microcomputer (not shown) and various mounting components are mounted. The mounted components are a resistor, a diode, a capacitor, a coil, and the like. The microcomputer controls the driving of the drive motor, the recording head 62, the scanner unit 12, and the like.

  Further, the control board 90 is a multilayer board, and a ground pattern 91 is formed on an inner layer. Further, as shown in FIG. 3, a connector 94 that is electrically connected to a ground pattern 91 via a lead 95 is mounted on the front end of the board surface 89 of the control board 90.

  The connector 94 is connected to a connector 96 mounted on a communication board 70 described later, and is connected to the communication board 70 via the connector 96. As a result, electrical continuity is established between the control board 90 and the communication board 70. The lead 95 of the connector 94 is bent, and the connection portion of the connector 94 connected to the connector 96 when mounted on the control board 90 faces forward.

<Communication board 70>
The multifunction device 10 includes a communication board 70 shown in FIG. 3 and FIG. The communication board 70 is a printed board made of glass epoxy, paper phenol, or the like, and has a front surface 72 and a rear surface 71. As shown in FIG. 4, the communication board 70 has a wiring pattern including a ground formed on a rear surface 71 and an antenna pattern 73 formed on an upper portion. The antenna pattern 73 is an example of an antenna, and the communication board 70 is an example of a wireless module board. The rear surface 71 is an example of one surface, and the front surface 72 is an example of the other surface.

  In the communication board 70, the connector 96 mounted on the rear surface 71 is connected to the connector 94 mounted on the control board 90. Thereby, the communication board 70 is supported by the control board 90 such that the rear surface 71 is substantially perpendicular to the control board 90. The communication board 70 protrudes upward from the control board 90 as shown in FIG. 3 while being supported by the control board 90. The communication board 70 is electrically connected to the control board 90 via connectors 96 and 94. The ground of the communication board 70 is electrically connected to the ground pattern of the control board 90 via the connectors 96 and 94. At least a part of the front surface 72 of the communication board 70 is covered with a metal shield case 97.

  The communication board 70 is provided with a communication circuit. Various electronic components (not shown) for performing wireless communication between the multifunction peripheral 10 and external devices are mounted on the communication board 70. Examples of the external device include a digital camera and a personal computer. Examples of wireless communication include Bluetooth (registered trademark) and infrared communication. These various electronic components perform wireless communication between the multifunction peripheral 10 and an external device.

<Ground conductive member 80>
The multifunction peripheral 10 includes a ground conductive member 80 inside the device housing 21. The ground conductive member 80 is an example of a conductor. The ground conductive member 80 illustrated in FIG. 3 has conductivity, and includes a foam made of, for example, urethane, and a conductive film covering the foam.

  As shown in FIGS. 5 and 3, the ground conductive member 80 includes a left conductive portion 80L, an intermediate conductive portion 80M, and a right conductive portion 80R. The rear end of the left conductive portion 80L and the rear end of the right conductive portion 80R are attached to the front end of the control board 90, respectively. The front end of left conduction part 80L is pasted on the left end of intermediate conduction part 80M, and the front end of right conduction part 80R is pasted on the right end of intermediate conduction part 80M. The rear edge of the intermediate conductive portion 80M is in contact with the front side of the shield case 97 provided on the front surface 72 of the communication board 70. As a result, the ground conductive member 80 is disposed so as to surround the front surface 72 side of the communication board 70 on an extension of the board surface 89 of the control board 90. Note that the above-described conductive portions 80L, 80R, and 80M are attached with, for example, a conductive adhesive.

  Normally, the wiring pattern formed on the surface of the printed circuit board is covered with a resist except for a portion where the solder is attached. The portion of the front end of the control substrate 90 to which the left conductive portion 80L and the right conductive portion 80R are attached is exposed without the wiring pattern being covered with the resist. Thus, the ground pattern of the control board 90 is electrically connected to the ground conductive member 80.

<Effect of First Embodiment>
According to this embodiment configured as described above, the rear surface 71 of the communication board 70 and the control board 90 are connected by the connectors 96 and 94 so as to be substantially orthogonal, and the front face 72 of the communication board 70 is connected to the control board 90. A ground conductive member 80 is arranged so as to surround the extension of the substrate surface 89.
As a result, the ground by the ground conductive member 80 can be arranged also on the front surface 72 side of the communication board 70 provided at the end of the control board 90, so that the ground is provided so as to be orthogonal to the board surface 89 of the control board 90. Therefore, it is possible to reduce the change in the frequency characteristic of the communication board 70 and to prevent the resonance frequency of the antenna of the communication board 70 from largely deviating from the design value.

<Second embodiment>
A second embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description will be omitted or simplified as appropriate.

  6, in the present embodiment, the control board 90 includes a substantially square notch 99 having an opening at the front end. The connector 94 is mounted near the rear edge portion 99b facing the opening among the left edge portion 99l, the rear edge portion 99b, and the right edge portion 99r forming the substantially square notch 99. The left edge 99l, the rear edge 99b, and the right edge 99r are examples of three sides forming the cutout 99, and the rear edge 99b is an example of one side facing the opening.

  The communication board 70 is connected to the inside of the notch 99 by connectors 94 and 96 such that the width direction of the rear surface 71 is parallel to the rear edge 99b. As described above, the antenna pattern 73 of the communication board 70 is disposed on the rear surface 71 of the communication board 70 on the rear side. The rear side is an example of the center side of the board surface 89 of the control board 90.

The ground conductive member 80 is electrically connected to the ground pattern of the communication board 70 at the edge of the opening forming the cutout 99. The conductive position between the ground conductive member 80 and the ground pattern on the control board 90 is located forward of the communication board 70. This front side is an example of the outer edge side of the board surface 89 of the control board 90.
The ground conductive member 80 contacts the shield case 97 of the communication board 70. As a result, the ground conductive member 80 presses the shield case 97 in a direction indicated by an arrow A, which is parallel to the arrow A that is the connection direction to the connector 94. In other words, the ground conductive member 80 contacts the front surface 72 of the communication board 70 via the shield case 97 and presses the front surface 72 in the direction of arrow A.
As a result, as in the first embodiment, the ground conductive member 80 is disposed so as to surround the front surface 72 of the communication board 70 on an extension of the board surface 89 of the control board 90.

  In addition, a protrusion 98A of a resin cover 98 disposed inside the device housing 21 contacts the front side of the ground conductive member 80.

<Effect of Second Embodiment>
According to the present embodiment, even when the communication board 70 is provided perpendicular to the end of the control board 90, the communication board 70 is arranged inside the notch 99 of the control board 90. For this reason, it is possible to suppress an increase in the size of the entire multifunction peripheral 10 in the front-rear direction of the control board 90 due to the thickness dimension of the communication board 70.

  In the present embodiment, in particular, at least a part of the front surface 72 of the communication board 70 is covered by the metal shield case 97, and the ground conductive member 80 contacts the shield case 97 of the communication board 70. Thereby, the communication board 70 can be pressed in the connection direction of the connector 94 by the contact of the ground conductive member 80 while protecting the communication circuit arranged on the communication board 70 by the metal shield case 97.

  In the present embodiment, in particular, the direction of the load applied to the communication board 70 by the contact of the ground conductive member 80 matches the direction of connection to the connector 94. Thus, the risk that the communication board 70 comes off the connector 94 can be reduced as compared with the conventional structure in which the direction of the load due to the contact of the conductor is opposite to the direction of insertion into the connector.

  Note that, as shown in FIG. 7, the ground conductive member 80 may be fixed to the projection 98A of the cover 98 in advance by pasting or the like. In this case, at the time of assembling the cover 98, the left and right ends of the ground conductive member 80 are in contact with the edges of the opening forming the notch 99, respectively, as shown by the broken arrows, so that conduction is achieved. Further, by the assembly of the cover 98, the ground conductive member 80 presses the shield case 97 in the direction of the arrow A parallel to the arrow A as described above.

<Third embodiment>
A third embodiment of the present invention will be described with reference to FIGS. 8A and 8B. This embodiment is an embodiment in which the ground conductive member 80 is omitted. The same parts as those in the first and second embodiments are denoted by the same reference numerals, and the description will be omitted or simplified as appropriate.

  As shown in FIG. 8A, in the present embodiment, a communication board 70 having an antenna pattern 73 and a ground (not shown) and a control board 90 are provided. The control board 90 electrically connects the ground pattern 91 formed on the board surface 89, the connector 94 mounted on the board surface 89 and electrically connected to the ground pattern 91 and the communication board 70, and the connector 94 and the ground pattern 91. And a lead 95 that is electrically connected.

  The communication board 70 is connected by a connector 94 so as to stand on the control board 90. The antenna pattern 73 (chain line) is provided on the front surface 72. The connector 94 is provided on the rear surface 71 and electrically connects the ground of the communication board 70 and the ground pattern 91 of the control board 90 via the leads 95. Thereby, the ground pattern 91 of the control board 90 is arranged on the board surface 89 so as to surround the connector 94.

<Effect of Third Embodiment>
According to the present embodiment, the ground of the communication board 70 is connected to the ground pattern 91 of the control board 90 by the connector 94, and the ground pattern 91 of the control board 90 is arranged so as to surround the connector 94.
For example, in the configuration shown in FIG. 8B, the communication board 70 is connected via the connector 94 to the ground pattern 91 provided at the end of the control board 90, so that the ground is located on the near side of the communication board 70 in the drawing. Pattern 91 is not arranged. On the other hand, according to the present embodiment, as a result of the above-described configuration, the ground pattern is arranged on both the near side and the back side of the communication board 70 in the drawing, so that the communication board 70 , And the resonance frequency of the antenna pattern 73 of the communication board 70 from being largely deviated from the design value can be reduced.

  It should be noted that, in addition to those already described above, the methods according to the above-described embodiments may be appropriately combined and used.

  Although not specifically exemplified, the present invention is embodied with various modifications without departing from the spirit of the invention.

10 Multifunction devices (wireless communication devices)
70 Communication board (wireless module board)
71 Back side (one side)
72 Front (other side)
73 Antenna pattern (antenna)
80 Grounding conductive member (conductor)
90 Control board (main board)
94 Connector 99 Notch 99b Rear edge (one side facing the opening)
99l Left edge 99r Right edge

Claims (7)

A wireless module substrate including an antenna and a ground,
A main board including a ground pattern and a connector mounted on an end of the board surface and electrically connected to the ground pattern;
Has,
The wireless module substrate,
One side of the wireless module board and the main board are connected by the connector so as to be substantially orthogonal,
The connector is
Electrically connecting the ground and the ground pattern,
Furthermore,
A conductor that is arranged so as to surround the other surface of the wireless module substrate on an extension of the substrate surface of the main substrate, and is electrically conductive to the ground pattern.
Wireless communication device. The wireless communication device according to claim 1,
The main board includes a substantially rectangular notch having an opening at the end, and the connector is mounted near one of the three sides forming the notch and facing the opening,
The wireless module substrate,
The connector is connected to a position inside the notch so that a width direction of the one surface is parallel to the opposite side.
Wireless communication device. The wireless communication device according to claim 2,
The conductor is
Abutting on the other surface, pressing the other surface in a direction parallel to a connection direction of the connector,
Wireless communication device. The wireless communication device according to claim 3,
The conductor is
At the edge of the opening, it is electrically connected to the ground pattern of the main board,
Wireless communication device. The wireless communication device according to claim 2,
The wireless module substrate,
A metal shield case that covers at least a part of the other surface,
The conductor is
Abutting on the shield case of the wireless module substrate, and pressing the shield case in a direction parallel to a connection direction of the connector;
Wireless communication device. The wireless communication device according to any one of claims 2 to 5,
The antenna of the wireless module board, of the wireless module board, is disposed on the center side of the board surface of the main board,
A conduction position between the conductor and the ground pattern is located closer to an outer edge of the main board than the wireless module board,
Wireless communication device. A wireless module substrate including an antenna and a ground,
A main board including a ground pattern formed on the board surface, and a connector mounted on the board surface and electrically connected to the ground pattern;
Has,
The wireless module substrate,
Connected by the connector so as to stand on the main board,
The connector is
Electrically connecting the ground and the ground pattern,
Furthermore,
The ground pattern is disposed on the board surface so as to surround the connector.
Wireless communication device.

Images