JP2007173560A - Double substrate structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double substrate structure which can accommodate most of an offset upon substrate assembly, and can have no stress remaining in a terminal or a soldered part. <P>SOLUTION: The double substrate structure has an upper substrate 4 electrically connected to a lower substrate 5, and held to be opposed to the lower substrate 5 and spaced therefrom by a predetermined interval. Holders 3b of resilient members 3 are provided to be freely moved in a direction parallel to the lower substrate 5 with the predetermined interval therebetween, and to hold the upper substrate 4 therebetween in its thickness direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention belongs to a technical field of a double substrate structure in which a first substrate and a second substrate are electrically connected and a second substrate is disposed so as to face the first substrate at a predetermined interval.

Conventionally, a first circuit board and a second circuit board that are arranged in parallel are connected by a board-to-board connector, a spacer is interposed at another required support location, and a displacement absorbing connector is connected to one board-to-board connector. Is used to absorb the misalignment between the socket and the plug (see, for example, Patent Document 1).
JP 2004-128017 A (page 2-4, full view)

  However, in the past, it was difficult to sufficiently absorb the deviation at the time of assembling the board, and stress remained in the terminals and solder portions.

  The present invention has been made paying attention to the above-mentioned problems, and the purpose thereof is a double substrate structure that absorbs most of the misalignment at the time of assembling the substrate so that there is no residual stress on the terminals and solder portions. Is to provide.

  In order to achieve the above object, in the present invention, the first substrate and the second substrate are electrically connected, and the second substrate holding the second substrate disposed facing the first substrate at a predetermined interval. In the structure, a holding means made of an elastic member is provided so as to be movable by providing a predetermined gap in the direction of movement parallel to the first substrate and holding the thickness direction of the second substrate. Features.

  Therefore, in the present invention, it is possible to absorb the deviation at the time of assembling the board and to prevent the residual stress on the terminal and the solder part.

  Hereinafter, an embodiment for realizing a double substrate structure of the present invention will be described based on Example 1. FIG.

First, the configuration will be described.
FIG. 1 is a perspective view of a display unit of a vehicle display device using the double substrate structure of the first embodiment. FIG. 2 is a perspective view of the display unit of the vehicle display device using the double substrate structure of the first embodiment when viewed from below the lower substrate. FIG. 3 is a perspective view of the module of the display unit of the vehicle display device using the double substrate structure of the first embodiment.

The configuration will be described with reference to FIGS.
Example 1 is an example of a display unit before completion of a display device for a vehicle using a double substrate structure. The display unit is configured by attaching the module 30 to the lower substrate 5. The module 30 includes the upper substrate 4, the case 1, the LCD 2, and the like.

4 is a cross-sectional view taken along the line AA in FIG. FIG. 5 is a bottom view of the state of the lower substrate of the display unit of the vehicle display device using the double substrate structure of the first embodiment.
As shown in FIG. 4, the display unit before the completion of the vehicle display device using the double substrate structure of the first embodiment includes a case 1, an LCD 2, an elastic member 3, an upper substrate 4, a lower substrate 5, an LED 6, The light guide plate 7, the connectors 8 and 9, the reflection sheet 10, the diffusion sheet 11, and the prism sheet 12 are the main components.
As shown in FIG. 3, the case 1 has four foot portions 1a, and claw portions for engagement are provided at the tips of the four foot portions 1a. Thus, the case 1 is engaged with the mounting hole 5a of the lower substrate 5 so that the case 1 is not displaced outward from the lower substrate 5.
Further, the case 1 covers the outer periphery of the LCD 2 and the upper substrate 4 by its shape, so that the LCD 2 and the upper substrate 4 are also held so as not to move outward from the lower substrate 5 of the case 1.

The LCD 2 displays an image by the action of liquid crystal. The upper substrate 4 is electrically connected by an FPC 13 (flat cable).
The elastic member 3 includes a frame-like portion 3a and a sandwiching portion 3b, and is made of an elastic rubber-based member. An example of the material is silicon rubber.
As shown in FIG. 5, the frame-shaped portion 3 a is a part of a rectangular shape that is located on the outer peripheral side of the upper substrate 4. The sandwiching portion 3b has four corners shown in FIG. 5 and an end portion between the corners at five locations as shown in FIG. The upper substrate 4 is held so that the entire elastic member 3 is supported in contact with the upper surface of the elastic member 3 and the thickness direction of the upper substrate 4 is sandwiched between the elastic member 3 and the upper portion.
Further, the portion sandwiching the upper substrate 4 of the sandwiching portion 3b allows the upper substrate 4 to move in the sliding direction (the direction of parallel movement with the lower substrate 5) by providing a gap between the upper substrate 4 and the outer peripheral side thereof. .
Further, a convex portion having a circular cross section is provided at the upper end of the elastic member 3, and the lower surface of the LCD 2 is supported by this portion.

The upper substrate 4 is a printed circuit board on which electronic components are mounted, to which an FPC 13 and an electrical connection connector (ACF) 14 are connected. Further, the LCD 2, the LED 6, and the like are mounted on the upper substrate 4.
The lower substrate 5 is a printed circuit board on which electronic components are mounted, and has attachment holes 5a with which the claw portions of the case 1 engage. Moreover, it has the positioning hole 5b which the positioning pin 1b of case 1 engages in two places.
The LED 6 is lit for image display as a backlight of the LCD 2, and is provided so as to be mounted on the upper substrate 4.
The light guide plate 7 guides light emitted from the LED 6 to the entire back surface of the LCD 2 so that the light emitted from the LED 6 serves as a backlight of the LCD 2.

The connector 8 is provided so as to protrude downward from the lower surface of the upper substrate 4, and the connector 9 is provided so as to protrude upward from the upper surface of the lower substrate 5. When the module 30 is assembled to the lower substrate 5, the connector 8 is engaged on the plug side and the connector 9 is on the socket side so that the connector 8 and the connector 9 are electrically connected.
The reflection sheet 10 is a sheet-like sheet that reflects the light guided to the entire back surface of the LCD 2 by the light guide plate 7 in the direction opposite to the LCD 2 so as to go to the LCD 2.

The diffusion sheet 11 is a sheet-like sheet that diffuses the light from the light guide plate 7 so as to further spread over the entire back surface of the LCD 2.
When the light diffused by the diffusion sheet 11 is irradiated from the back surface of the LCD 2 as it is, the prism sheet 12 becomes a blurred image, so that the diffused light has a relatively linear directivity from the back surface of the LCD 2 to the front surface. It is a sheet that changes directivity.

The operation will be described.
[Background technology]
The background technology of the vehicle display device using the double substrate structure of the first embodiment will be described. In addition, the code | symbol of Example 1 is used for a code | symbol.
The vehicle display device displays vehicle information and warnings on various display elements including the LCD 2. The double substrate structure is particularly useful in a structure in which a display device having a so-called module structure in which the LCD 2 and the drive substrate (upper substrate 4) are integrated with a base substrate (lower substrate 5) as shown in FIG.

The modular structure is achieved by consolidating the display driver, drive circuit, backlight illumination circuit, and backlight illumination members (light guide plate, reflection sheet, etc.) around the display element, thereby reducing the size and height of the entire display device. This is because density mounting is easy to achieve.
FIG. 9 is a cross-sectional view of a display unit of a vehicle display device using a double substrate structure already devised by the present inventors. FIG. 10 is an explanatory view showing a module mounting state on the lower substrate of the display unit of the vehicle display device using the double substrate structure already devised by the present inventor. FIG. 11 is an explanatory diagram showing a state in which the upper substrate of the display unit of the vehicle display device using the double substrate structure already devised by the present inventors is displaced.

In the module structure shown in FIGS. 9 and 10, the electrical connection between the upper substrate 4 and the lower substrate 5 is performed by connectors 8 and 9. Here, with regard to the structure of the connector, it is conceivable to prevent bending of the connector terminal due to misalignment of the board assembly, and to relieve stress on the board soldered part, and it is conceivable to make the terminal structure a floating structure. It is difficult to sufficiently absorb the deviation at the time of assembly, and there are cases where stress remains in the terminals and soldered portions of the floating connector. The original problem in which such a problem occurs will be described based on the structure shown in FIGS.
9 and 10, a claw portion 20 is provided inside the case 1, and the upper substrate 4 is held on the case 1 by the claw portion 20. The claw portion 20 is used because the upper substrate 4 may be pushed in at the time of assembly, and the assembly is easy. In such a structure, in order to solve the above-described problem, the gap, that is, the play, is allowed so as to allow the sliding movement of the upper substrate 4 as shown in FIG. A large amount may be provided.

However, in the case of such a structure, in order to increase the play amount, it is necessary to increase the catching amount of the claw portion 20 integrated with the case 1 and increase the play in the outer peripheral direction of the upper substrate 4. There is. However, if the catching amount of the claw part 20 is increased, there is a problem that the assembly to be pushed into the claw part 20 becomes difficult.
The double substrate structure of Example 1 solves these problems.

[Action of holding the upper substrate by an elastic member]
In the first embodiment, the upper substrate 4 is sandwiched by the sandwiching portion 3 b of the elastic member 3. For this reason, the nail on the lower side of the sandwiching portion 3b can be easily assembled without any problem because it is elastically deformed at the time of assembling even if the catching margin is increased.
Therefore, the amount of play in the outer peripheral direction of the upper substrate 4 can be increased, that is, the movable space of the upper substrate 4 can be widened. For example, even if a relatively large misalignment occurs during board assembly, Since 4 moves and is automatically corrected, the residual stress of the terminal and the soldered portion is remarkably relieved.

This operation will be further described.
FIG. 6 is an explanatory diagram illustrating a state in which the module is attached to the lower substrate in the display unit of the vehicle display device using the double substrate structure according to the first embodiment. FIG. 7 is an explanatory diagram illustrating a state in which the upper substrate in the display unit of the vehicle display device using the double substrate structure according to the first embodiment is shifted left and right. FIG. 8 is an explanatory diagram illustrating a state in which the module is attached to the lower substrate in the display unit of the vehicle display device using the double substrate structure according to the first embodiment.

  As shown in FIG. 3, a positioning pin 1 b is provided on the lower surface of the case 1, and a positioning hole 5 b that engages with the positioning pin 1 b is provided on the lower substrate 5. When attaching the module 30 including the case and the upper substrate 4 to the lower substrate 5, as shown in FIG. 6, while engaging the claw portion of the foot portion 1a of the case 1 with the attachment hole 5a of the lower substrate 5, The connectors 8 and 9 are engaged.

  At this time, as shown in FIGS. 8A to 8C, the positioning pins 1b of the case 1 are inserted into the positioning holes 5b of the lower substrate 5, and the positions are determined. Engage. Therefore, as shown in FIG. 7, when the position of the upper substrate 4 is shifted, stress is applied to the connectors 8 and 9, the inside thereof, the soldered portion, and the like. In the first embodiment, even if a relatively large misalignment occurs, the upper substrate 4 moves immediately after assembly and is automatically corrected. Even in such a case, the residual stress in the terminal and the soldered portion is remarkably relieved. It can be avoided.

  Further, even if a relatively large positional deviation occurs, if the upper substrate 4 moves immediately after assembly and is automatically corrected, no stress is applied to the connectors 8 and 9. Furthermore, in order to widen the movable space of the upper substrate 4, if the upper substrate 4 moves when the connectors 8 and 9 are engaged, an engagement state in which the connectors 8 and 9 are twisted is not generated. Thereby, the damage of the connector housing and the damage of the terminal due to the twist engagement can be eliminated.

[Buffer action]
In the display portion of the vehicle display device using the double substrate structure of the first embodiment, the upper substrate 4 is elastically supported by the sandwiching portion 3 b of the elastic member 3. Further, a frame-like portion 3a is arranged around the periphery. For this reason, compared with the holding | maintenance of the nail | claw part 20, in any direction, the effect | action which absorbs a vibration and an impact with respect to the vibration from the outside can be acquired, and after an assembly, an elastic member The upper substrate 4 does not vibrate freely due to the friction with 3. Thus, it is possible to protect electronic components that are weak against vibration and shock mounted on the upper substrate 4.

  In addition, since the LCD 2 is elastically supported by the convex portion at the upper end of the elastic member, it is possible to obtain an action of absorbing vibrations and impacts against vibrations from the outside. Can be prevented.

  Next, the effect will be described.

  In the double substrate structure of Example 1, the effects listed below can be obtained.

  (1) In the double substrate structure in which the lower substrate 5 and the upper substrate 4 are electrically connected and the upper substrate 4 is disposed facing the lower substrate 5 at a predetermined interval, the lower substrate 5 is In addition, since the holding part 3b of the elastic member 3 is provided so as to be movable by providing a predetermined gap in the parallel moving direction and to hold the upper board 4 in the thickness direction, the deviation at the time of assembling the board is absorbed, There can be no residual stress on the terminals and solder.

  As described above, the double substrate structure of the present invention has been described based on the first embodiment. However, the specific configuration is not limited to these embodiments, and the invention according to each claim of the claims is described. Design changes and additions are allowed without departing from the gist.

In the first embodiment, the display unit of the vehicle display device in which the LCD is attached to the upper substrate has been described. However, as long as it has a double substrate structure, it may be used for other devices.
The upper and lower sides of the upper substrate and the lower substrate are for explanation, and may be used in reverse.
In the first embodiment, the electrical connection of the double board is by a connector. However, even if other connections are used, the double board has a double board structure in which a large displacement of the upper board is a problem. Good.

Even if the elastic member has a shape different from that described in the first embodiment, any member may be used as long as it holds the thickness direction of the upper substrate.
The position and number of the sandwiching portions may be determined by the size and weight of the upper substrate and the LCD.

1 is a perspective view of a display unit of a vehicle display device using a double substrate structure of Example 1. FIG. It is the perspective view which looked at the display part of the display apparatus for vehicles using the double substrate structure of Example 1 from the lower part of the lower board | substrate. It is a perspective view of the module of the display part of the display apparatus for vehicles using the double substrate structure of Example 1. FIG. However, illustration of the elastic member 3 and the connector 8 is omitted. It is AA sectional drawing of FIG. It is a bottom view of the state of the lower board | substrate of the display part of the display apparatus for vehicles using the double board | substrate structure of Example 1. FIG. It is explanatory drawing which shows the attachment state of the module to the lower board | substrate in the display part of the display apparatus for vehicles using the double board | substrate structure of Example 1. FIG. It is explanatory drawing which shows the state which the upper board | substrate in the display part of the display apparatus for vehicles using the double board | substrate structure of Example 1 shifted to right and left. It is explanatory drawing which shows the attachment state of the module to the lower board | substrate in the display part of the display apparatus for vehicles using the double board | substrate structure of Example 1. FIG. It is sectional drawing of the display part of the vehicle display apparatus using the double substrate structure which this inventor has already devised. It is explanatory drawing which shows the module attachment state to the lower board | substrate of the display part of the vehicle display apparatus using the double board | substrate structure which this inventor has already devised. It is explanatory drawing which shows the state which the upper board | substrate of the display part of the vehicle display apparatus using the double board | substrate structure which this inventor already devised shifted | deviated.

Explanation of symbols

1 Case 1a Foot 1b Positioning pin 2 LCD
3 Elastic member 3a Frame-like part 3b Clamping part 4 Upper substrate 5 Lower substrate 5a Mounting hole 5b Positioning hole 6 LED
7 Light guide plate 8 Connector 9 Connector 10 Reflective sheet 11 Diffusion sheet 12 Prism sheet 13 FPC
14 Electrical connector (ACF)
20 nail part 30 module

Claims (1)

In the double substrate structure in which the first substrate and the second substrate are electrically connected and the second substrate is disposed to be opposed to the first substrate at a predetermined interval.
A holding means made of an elastic member is provided so as to be movable by providing a predetermined gap in the direction of movement parallel to the first substrate and sandwiching the thickness direction of the second substrate,
A double substrate structure characterized by that.

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