JP6786924B2 - Mobile terminal - Google Patents

Description

The technique disclosed herein relates to a mobile terminal including a circuit board.

Patent Document 1 discloses a mobile terminal having a circuit module inside the case body. An elastic adhesive is provided on one surface of the circuit module, and the circuit module and the case body are fixed via the elastic adhesive. Further, a cushioning member is provided on the other surface of the circuit module. In the technique of Patent Document 1, by arranging the circuit module in the case body without fixing a part of the circuit module, the circuit module is deformed by its own weight or the circuit module is deformed by an impact applied from the outside of the mobile terminal. We are trying to prevent it from happening.

Japanese Unexamined Patent Publication No. 2006-048097

In the technique of Patent Document 1, each corner portion (that is, the outer peripheral end portion of each surface) of the circuit module is not covered with the elastic adhesive or the cushioning member, but is exposed in the case body. Therefore, in the circuit module, the part exposed inside the case body is more likely to be impacted than the part covered with the elastic adhesive or the cushioning member. Therefore, when an external impact is applied to the mobile terminal, a strong stress may be applied to a part of the circuit module, which may damage the circuit module. The present specification discloses a mobile terminal capable of suppressing damage to a circuit board when an external impact is applied.

The portable terminal disclosed in the present specification is a circuit board and an elastic shock absorber, which covers the entire range of the front surface of the circuit board and the entire back surface of the circuit board, and covers the circuit board on the front side and the back side. A buffer member sandwiched from both sides of the circuit board and a main body for accommodating the circuit board and the buffer member are provided.

The circuit board is generally plate-shaped. A plate-shaped circuit board is easily damaged when it receives an impact in the front-back direction. However, in the above-mentioned mobile terminal, the shock absorber covers the entire range of the front surface of the circuit board and the entire range of the back surface of the circuit board, and sandwiches the circuit board from both the front surface side and the back surface side. Therefore, even when an external impact is applied to the mobile terminal, it is possible to suppress the application of strong stress in the front-back direction to only a part of the circuit board. Therefore, according to the above-mentioned mobile terminal, it is possible to prevent the circuit board from being damaged when an external impact is applied.

The perspective view of the mobile terminal is shown. The internal structure of the mobile terminal of the first embodiment is shown. The perspective view of the circuit board and the cushioning member of 2nd Example is shown. The top view of the circuit board and the cushioning member of the second embodiment is shown. The circuit board and the cushioning member of the third embodiment are shown.

The main features of the examples described below are listed. It should be noted that the technical elements shown below are independent technical elements, and exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. ..

(Feature 1) The cushioning member may be in close contact with the entire front surface of the circuit board and may be in close contact with the entire back surface.

According to the configuration of feature 1, since the front surface and the back surface of the circuit board are in close contact with the cushioning member, there is a space (that is, a gap) between the front surface and the back surface of the circuit board and the cushioning member. In comparison with the above, when an impact is applied to the mobile terminal, it is possible to suppress the application of strong stress in the front and back directions to a part of the circuit board. Therefore, according to the configuration of feature 1, it is possible to more effectively suppress damage to the circuit board when an external impact is applied.

(Feature 2) The cushioning member may further cover the outer peripheral end surface of the circuit board.

According to the configuration of feature 2, the shock absorbing member can also reduce the impact in the creepage direction applied to the circuit board. As a result, damage to the circuit board can be suppressed more effectively.

(Feature 3) The mobile terminal may further include a peripheral member and a flexible connecting member that electrically connects the circuit board and the peripheral member.

According to the configuration of the feature 3, since the connecting member has flexibility, it is possible to prevent the connection between the circuit board and the peripheral member from being disconnected even when an external impact is applied to the mobile terminal. it can.

(First Example)
As shown in FIG. 1, the mobile terminal 1 is an optical information reading device for reading an information code (for example, a bar code or a two-dimensional code). The mobile terminal 1 includes a main body 2, a display screen 4, an operation unit 5, a reading unit 7, and two key buttons 9. One of the two key buttons 9 is provided at a position that cannot be seen in FIG. Hereinafter, among the surfaces of the main body 2, the surface parallel to the XY plane of the coordinate system in the drawing and facing the positive direction of the Z axis is referred to as an “upper surface”. Of the surfaces of the main body 2, the surface parallel to the XY plane of the coordinate system in the drawing and facing the negative direction of the Z axis is referred to as a "bottom surface". Of the faces of the main body 2, the two faces parallel to the YZ plane of the coordinate system in the drawing are called "side surfaces".

The display screen 4 is a liquid crystal screen provided on the upper surface of the main body 2. The display screen 4 can display the information recorded in the read information code, the information input to the operation unit 5, and the like. The operation unit 5 is provided on the upper surface of the main body 2. The operation unit 5 is located in the positive direction of the Y axis when viewed from the display screen 4. The operation unit 5 is composed of a plurality of buttons. The user can input various instructions to the mobile terminal 1 by operating the operation unit 5.

Key buttons 9 are provided on each of the two side surfaces of the main body 2. Each key button 9 is provided so as to project from the surface of the side surface of the main body 2. When the user presses one or both of the two key buttons 9 in the direction toward the surface of the side surface (X-axis direction), the key button 9 activates a switch (not shown) built in the main body 2. .. As a result, the reading instruction is input to the mobile terminal 1. The reading instruction is an instruction for the mobile terminal 1 to read the information code using the reading unit 7.

The internal structure of the mobile terminal 1 will be described with reference to FIG. The main body 2 is composed of an upper case 10a on the upper surface side and a lower case 10b on the lower surface side. The upper case 10a and the lower case 10b are integrated by being fixed to each other by, for example, screwing. The circuit board 6 and the two cushioning members 8a and 8b are housed in the main body 2. The circuit board 6 is a plate-shaped board on which electronic circuits for executing various calculations are mounted. The circuit board 6 is electrically connected to the display screen 4 via the connecting member 12. The circuit board 6 can output a signal indicating image data to the display screen 4 via the connecting member 12, and display the image represented by the image data on the display screen 4. The connecting member 12 is a flexible wire, an FPC (abbreviation for Flexible printed circuits), or the like. The circuit board 6 is also connected to an output member (for example, a speaker) (for example, a speaker) which is not shown, via a connection member (not shown). As a result, the circuit board 6 realizes the output by the output member via the connecting member.

The cushioning members 8a and 8b are made of an elastic material (for example, rubber, resin, foam, etc.). The cushioning member 8a covers the entire range of the surface of the circuit board 6 (the surface on the positive direction side (upper side) of the Z axis in FIG. 2). The cushioning member 8b covers the entire range of the back surface of the circuit board 6 (the surface on the negative direction side (lower side) of the Z axis in FIG. 2). The buffer members 8a and 8b sandwich the circuit board 6 from both the front surface side and the back surface side. Since the contact surfaces of the circuit board 6 and the buffer members 8a and 8b are flat, the buffer member 8a is in close contact with the entire surface of the circuit board 6, and the buffer member 8b is in close contact with the entire back surface of the circuit board 6. ing. As the length (that is, thickness) of the shock absorbers 8a and 8b in the Z-axis direction, any length can be adopted. When the lengths of the buffer members 8a and 8b in the Z-axis direction are relatively long (that is, thick), the effect of alleviating the impact on the circuit board 6 becomes large, and the lengths of the buffer members 8a and 8b in the Z-axis direction are compared. If it is short (that is, thin), the size of the mobile terminal 1 can be reduced. The relationship between the length of the buffer members 8a and 8b in the Z-axis direction and the effect of alleviating the impact on the circuit board 6 is the shape and weight of the circuit board 6, the strength of the element on the circuit board 6, and the buffer member. It can be evaluated by simulation using parameters such as materials of 8a and 8b.

The length (that is, thickness) of the laminated body of the circuit board 6 and the buffer members 8a and 8b in the Z-axis direction is slightly shorter than the length of the space in the main body 2 in the Z-axis direction. Therefore, when the laminated body is stored in the main body 2, a slight space is provided between the laminated body and the inner surface of the main body 2. As a result, even in a situation where an impact or the like is applied to the main body 2, the laminated body is less likely to receive pressure in the Z-axis direction from the main body 2, and the circuit board 6 is less likely to be damaged. The laminated body is locked by a plurality of locking members 11 projecting inside the main body 2, so that displacement in the XY plane direction is suppressed. The locking member 11 is provided inside the upper case 10a. In the modified example, the thickness of the laminated body may be the same as or slightly longer than the length of the space in the main body 2 in the Z-axis direction.

(Effect of the first embodiment)
In order to fully explain the effects of the mobile terminal 1 of this embodiment, a mobile terminal of a comparative example (that is, a conventional mobile terminal) in which the circuit board 6 is fixed in the main body 2 is assumed. In the mobile terminal of the comparative example, the buffer members 8a and 8b of the present embodiment are not provided in the main body. In the mobile terminal of the comparative example, the circuit board 6 is fixed to a fixing member made of a rigid material (that is, a material having no elasticity). The fixing member is a frame body having a shape that matches the outer peripheral shape of the circuit board 6. Specifically, for example, the circuit board 6 is fixed to the fixing member by screwing several places on the outer peripheral edge thereof into screw holes provided in the fixing member. That is, in the mobile terminal of the comparative example, a combination member of the circuit board 6 and the fixing member is housed in the main body instead of the laminated body of the buffer members 8a and 8b of the present embodiment and the circuit board 6. In the mobile terminal of the comparative example, when an impact is received from the outside, the portion of the circuit board 6 fixed to the fixing member is difficult to be displaced, and the portion not fixed to the fixing member is easily displaced (that is, bending). Cheap). Further, even when the mobile terminal is not impacted, the portion of the circuit board 6 that is not fixed to the fixing member is more likely to be displaced by the weight of the circuit board 6 than the portion that is fixed. .. Therefore, for example, when the mobile terminal receives an impact, the difference in the amount of displacement between the fixed portion and the non-fixed portion becomes large, so that a strong stress in the front and back directions is applied to a part of the circuit board 6. In addition, the circuit board 6 may be damaged. In particular, since the circuit board 6 has a plate shape, it is easily damaged when it receives an impact in the front and back directions.

On the other hand, in the mobile terminal 1 of the present embodiment, the buffer members 8a and 8b cover the entire range of the front surface of the circuit board 6 and the entire range of the back surface of the circuit board 6, and the circuit board 6 is provided on both the front side and the back surface side. It is sandwiched from. In the mobile terminal 1 of this embodiment, a part of the circuit board 6 is not fixed as in the above comparative example. Therefore, even when an external impact is applied to the mobile terminal 1, it is possible to suppress the application of strong stress in the front-back direction to only a part of the circuit board 6. Therefore, according to the mobile terminal 1 of the present embodiment, it is possible to prevent the circuit board 6 from being damaged when an external impact is applied.

Since the cushioning members 8a and 8b are in close contact with the entire front surface and the back surface of the circuit board 6, there is a space (that is, a gap) between the front surface and the back surface of the circuit board 6 and the cushioning members 8a and 8b. Compared to the case, when an impact is applied to the mobile terminal 1, it is possible to suppress the application of strong stress in the front and back directions to a part of the circuit board 6. Therefore, it is possible to more effectively prevent the circuit board 6 from being damaged when an external impact is applied.

Since the connecting member 12 has flexibility, it is possible to prevent the connection between the circuit board 6 and the display screen 4 from being disconnected even when an external impact is applied to the mobile terminal 1.

(Second Example)
In the second embodiment, the shape of the cushioning member is different from that in the first embodiment. As shown in FIGS. 3 and 4, the buffer member 8c of this embodiment is formed with a hole 13 for inserting the circuit board 6. The opening 13a of the hole 13 is exposed on the side surface of the cushioning member 8c. The shape of the hole 13 is the same as the shape of the circuit board 6. However, the size of the hole 13 (that is, the length in each of the X, Y, and Z axes) is slightly smaller than the size of the circuit board 6 (that is, the length in each of the X, Y, and Z axes). In this embodiment, the circuit board 6 is inserted into the hole 13 of the cushioning member 8c from the opening 13a in the positive direction of the Y-axis. FIG. 4 shows a top view of the circuit board 6 and the cushioning member 8c after insertion. In this way, the cushioning member 8c covers not only the front surface and the back surface of the circuit board 6, but also the outer peripheral end surface of the circuit board 6. As described above, since the size of the hole 13 is slightly smaller than the size of the circuit board 6, the circuit board 6 receives a restoring force from the cushioning member 8c and is stably held by the cushioning member 8c. At this time, the buffer member 8c is in close contact with the entire front surface and the entire back surface of the circuit board 6 inserted into the hole 13.

Also in the mobile terminal 1 of this embodiment, the cushioning member 8c covers the entire range of the front surface of the circuit board 6 and also covers the entire range of the back surface of the circuit board 6. Further, the cushioning member 8c sandwiches and holds the circuit board 6 inserted in the hole 13 from both the front surface side and the back surface side. The buffer member 8c is in close contact with the entire surface of the front surface of the circuit board 6 inserted into the hole 13 and the entire surface of the back surface. Therefore, even in the mobile terminal 1 of the present embodiment, it is possible to prevent the circuit board 6 from being damaged when an external impact is applied, as in the first embodiment. Further, in the present embodiment, since the shock absorber 8c also covers the outer peripheral end surface of the circuit board 6, the impact in the creepage direction applied to the circuit board 6 can be alleviated. As a result, damage to the circuit board 6 can be suppressed more effectively.

(Third Example)
In the second embodiment, the shape of the cushioning member is different from that of the first and second embodiments. As shown in FIG. 5, the circuit board 6 and the cushioning members 8d and 8e are housed in the main body 2 of the mobile terminal 1 of this embodiment. In the buffer members 8d and 8e, the contact surface with the circuit board 6 is not a flat surface but a wavy surface. Similar to the buffer members 8a and 8b of the first embodiment, the buffer members 8d and 8e cover the entire range of the front surface of the circuit board 6 and the entire range of the back surface of the circuit board 6, and cover the circuit board 6 on the front side and the back surface. It is sandwiched from both sides of the side. Even in the mobile terminal 1 of this embodiment, it is possible to prevent the circuit board 6 from being damaged when an external impact is applied. Further, since there is a gap between the circuit board 6 and the buffer members 8d and 8e, it is possible to prevent the members (for example, connecting members) arranged on the circuit board 6 from being pressed.

Although the examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of claims. The techniques described in the claims include various modifications and modifications of the specific examples illustrated above. For example, the following modification may be included.

(Modification 1) The "mobile terminal" is not limited to the mobile terminal 1 for reading an information code, and includes all mobile terminals such as smartphones, PDAs (abbreviations of Personal Data Assistant), and portable music players.
(Modification 2) The connecting member 12 may be a hard wire or the like having no flexibility. That is, the "connecting member" does not have to be flexible.

1: Mobile terminal 2: Main body 4: Display screen 5: Operation unit, 6: Circuit board, 7: Reading unit, 8a to 8e: Buffer member, 9: Key button, 10a: Upper case, 10b: Lower side Case, 11: locking member, 12: connecting member, 13: hole, 13a: opening

Claims (3)

It ’s a mobile terminal,
With the circuit board
An elastic cushioning member that covers the entire range of the front surface of the circuit board and the entire back surface of the circuit board, and sandwiches the circuit board from both the front surface side and the back surface side.
A main body that houses the circuit board and the buffer member,
Bei to give a,
A mobile terminal in which the contact surface of the buffer member with the circuit board is formed in a wavy shape . The mobile terminal according to claim 1 , wherein the cushioning member further covers the outer peripheral end surface of the circuit board. The mobile terminal further
Peripheral members and
The mobile terminal according to claim 1 or 2 , further comprising a flexible connecting member, the connecting member for electrically connecting the circuit board and the peripheral member.

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