electronic equipment

Abstract

To suitably support a display part.SOLUTION: A scientific calculator 1 comprises: a liquid crystal display 2; and a protection panel 3 for supporting a back face of the liquid crystal display 2. The protection panel 3 comprises: a plurality of ribs 30 erected on a principal plane on the opposite side of the liquid crystal display 2; and a plurality of recesses 35 surrounded by the plurality of ribs 30. The plurality of recesses 35 include the ones with nonuniform size.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an electronic device. [Background technology]

[0002] Conventionally, electronic devices such as scientific calculators sometimes have a protective panel placed behind the liquid crystal display to support the display. While aluminum protective panels are suitable for this type of display, resin panels are more preferable for reducing weight.

[0003] In some cases, resin protective panels have ribs on the back surface to improve strength (rigidity) while reducing weight. Such ribs are generally formed in a uniform pattern such as a honeycomb or diamond shape, as shown in Patent Documents 1 and 2, for example. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-10414 [Patent Document 2] Japanese Patent Application Publication No. 9-62400 Summary of the Invention [Problem to be solved by the invention]

[0005] However, a uniform pattern of ribs does not adequately accommodate unevenly distributed loads on the protective panel. The present invention has been made in view of the above circumstances, and has an object to provide a suitable support for a display unit such as a liquid crystal display. [Means for solving the problem]

[0006] Book The invention relates to an electronic device, a first electrical component and a second electrical component connected by a wire; disposed between the first electrical component and the second electrical component A display unit; the display unit Protection attached to the back of The components and Equipped with The aforementioned protection The member is erected on the main surface opposite to the display unit. Ribs and, a hook for engaging the wire rod, and the rib is not provided at a location where the hook is provided. It is characterized by: [Effects of the Invention]

[0007] According to the present invention, the display unit can be supported in a suitable manner. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of a scientific calculator according to an embodiment; [Figure 2] (a) is a view of the upper half of the inside of the scientific calculator as seen from the rear side, and (b) is a cross-sectional view taken along line II-II in (a). [Figure 3] 10A and 10B are diagrams showing the results of an analysis of the deformation behavior of a protection panel. [Figure 4] FIG. 10 is a diagram showing the design loads of the topology analysis. [Figure 5] FIG. 10 is a diagram showing the analysis results of topology analysis. [Figure 6] FIG. 10 is a diagram showing an analytical model for deformation amount analysis. [Figure 7] FIG. 10 is a diagram showing the results of an analysis of the amount of deformation of a liquid crystal display. [Figure 8] 10A and 10B are diagrams showing the results of an analysis of the deformation amount of a protection panel. [Figure 9] This is a rear view of the inside of a scientific calculator when the battery spring is placed on the protection panel. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of an electronic device according to the present invention will be described with reference to FIGS. It should be noted that the embodiments described below are subject to various limitations that are technically preferable for carrying out the present invention, but the scope of the present invention is not limited to the following embodiments and illustrated examples.

[0010] FIG. 1 is a perspective view of a scientific calculator 1 according to this embodiment, FIG. 2(a) is a view of the upper half of the interior of the scientific calculator 1 as seen from the rear side, and FIG. 2(b) is a cross-sectional view taken along line II-II in FIG. 2(a). In the following description, the front-to-back, left-to-right, and up-to-down directions refer to the directions shown in the drawings. In other words, the front-to-back direction refers to the front-to-back direction (thickness direction) of the scientific calculator 1, the left-to-right direction refers to the width direction of the scientific calculator 1, and the up-to-down direction refers to the longitudinal direction of the scientific calculator 1.

[0011] As shown in Figure 1, scientific calculator 1 is an example of an electronic device according to the present invention, and is formed in the shape of a rectangular plate that is long in the vertical direction. Scientific calculator 1 comprises a front case 11 that covers the front (front side) and a back case 12 that covers the back (rear side). Front case 11 is provided with a liquid crystal display 2 that displays various information, and a plurality of operation buttons 13 that receive user operations. Front case 11 and back case 12 engage in the front-to-rear direction to form the housing of scientific calculator 1.

[0012] As shown in FIG. 2, a liquid crystal display 2 and its protection panel 3 are housed inside a housing defined by a front case 11 and a rear case 12. The liquid crystal display 2 is an example of a display unit according to the present invention, and is arranged above the center in the vertical direction of the scientific calculator 1. The liquid crystal display 2 has a liquid crystal main body 21 and a connector unit 22.

[0013] The liquid crystal body 21 is formed in the shape of a rectangular plate that is long in the left-right direction and short in the up-down direction, and the front display surface is exposed to the front of the scientific calculator 1 through the front case 11. The connector section 22 is a terminal section of the liquid crystal display 2 for electrically connecting the liquid crystal main body 21 to a printed circuit board 41 on which a control circuit is mounted, and is provided below the liquid crystal main body 21. The connector section 22 is electrically connected to the printed circuit board 41, which is located below the liquid crystal display 2, via a flexible substrate 42 connected to the center of the left and right sides of the connector section 22. The connector section 22 is also located forward of the rear surface of the liquid crystal main body 21, and is separated from the protection panel 3.

[0014] The protective panel 3 is an example of a support member according to the present invention, and is formed in the shape of a rectangular plate that is slightly larger than the liquid crystal display 2. The protective panel 3 is arranged so as to cover substantially the entire back surface (rear surface) of the liquid crystal display 2, and is attached to the rear surface of the liquid crystal main body 21 with double-sided tape (not shown) to support the liquid crystal display 2. The protective panel 3 of this embodiment is made of resin (contains resin).

[0015] The portion of the rear surface of the protective panel 3 that corresponds to the liquid crystal display 2 is a reinforcement portion R with increased rigidity, and is provided with a plurality of reinforcing ribs 30. The reinforcement portion R in this embodiment is formed symmetrically from left to right and asymmetrically from top to bottom, and has a first reinforcement portion R1 that corresponds to the position of the liquid crystal main body 21 and a second reinforcement portion R2 that is provided below the first reinforcement portion R1 in the center of the left and right directions. Specifically, the multiple ribs 30 include multiple first ribs 31 extending diagonally relative to the vertical direction, multiple second ribs 32 parallel to the left-right direction, and two third ribs 33 parallel to the vertical direction.

[0016] In this embodiment, the four first ribs 31 are arranged symmetrically in the left-right direction, that is, formed in a shape that is line-symmetrical with respect to the left-right center line V of the liquid crystal main body 21. The first ribs 31 closer to the left-right center line V have a smaller inclination angle with respect to the up-down direction and stand upright. The first ribs 31 are arranged asymmetrically in the vertical direction. More specifically, each first rib 31 is bent toward the horizontal center with a bending point located on the vertical center line H of the liquid crystal main body 21, and is inclined so as to approach the horizontal center line V as it moves away from the vertical center line H. Each first rib 31 extends at approximately the same inclination angle above and below the bending point, but the distance from the vertical center line H to its lower end is longer than the distance from the vertical center line H to its upper end. Therefore, each first rib 31 is asymmetrical in the vertical direction.

[0017] In this embodiment, six second ribs 32 are arranged vertically at approximately equal intervals. However, the length L3 of the bottom second rib 32b is approximately one-third of the lengths (L1, L2) of the other second ribs 32a, and the bottom second rib 32b is located in the left-right center and connects the bottom ends of the four first ribs 31. Two third ribs 33 are disposed at both the left and right ends of the first reinforcing portion R1, connecting the left and right ends of the five second ribs 32a, respectively. However, the lower end of each third rib 33 is bent in a chamfered shape and connected to the second rib 32a. In addition, of the fifth second rib 32a from the top, a third rib 33a that is slightly shorter in both the vertical direction extends downward slightly outward from the intersection with the first ribs 31 on both the left and right sides. One end (lower end) of this third rib 33a is the only one that is not connected to the other ribs 30. Of the reinforcing portion R, the rectangular portion enclosed by the upper end and the fifth second rib 32a from the top and the two third ribs 33 on the left and right constitutes the first reinforcing portion R1, and the portion below that constitutes the second reinforcing portion R2.

[0018] By arranging the plurality of ribs 30 as described above, a plurality of recesses 35 surrounded by the plurality of ribs 30 are formed on the rear surface of the protective panel 3. That is, the plurality of recesses 35 are defined by the plurality of first ribs 31, the plurality of second ribs 32, and two third ribs 33. The recesses 35 are formed with non-uniform sizes, and in this embodiment, the size of the recesses 35 generally decreases the farther they are from the left-right center line V of the liquid crystal display 2 (liquid crystal main body 21). More specifically, of the recesses 35, the recesses 35 arranged near the center in the longitudinal direction of the liquid crystal display 2 are more sparsely distributed than the recesses 35 arranged near both ends in the longitudinal direction. In other words, the recesses 35 are arranged so that they are more densely packed at the left and right ends than at the left-right center. The plurality of recesses 35 may include recesses of the same size as long as they are not uniform in size (different in size).

[0019] A plurality of hooks 36 and extensions 37 are provided on both the left and right sides of the lower end of the protective panel 3 (on both the left and right sides of the second reinforcing portion R2). The multiple hooks 36 are for retaining lead wires (wires) 45. The lead wires 45 electrically connect the solar panel 43, battery 44, etc., which are arranged above the protective panel 3, to the printed circuit board 41, and are routed along and beside the rib 30. Note that the hooks 36 only need to be provided on at least one of the left and right sides of the portion of the protective panel 3 that corresponds to the connector portion 22. The extensions 37 extend downward from the lower ends of both the left and right sides of the protection panel 3 and support the printed circuit board 41 .

[0020] Next, the analysis used to determine the shape of the rib 30 will be described. In this analysis, we first confirmed the deformation behavior of the protective panel 3 when an external force is applied to the scientific calculator 1. A simple flat plate model without ribs 30 was used as the protective panel 3, and calculations were performed for the case where the panel was dropped from both the front and rear sides while housed inside the scientific calculator 1. Figures 3(a) and (b) show the main deformation behavior of the protective panel 3 (analysis model) (deformation magnification: 50 times). As shown in these figures, when the scientific calculator 1 is dropped, the protective panel 3 deforms so that the four corners (top, bottom, left, and right) lift up (Figure 3(a)), or the center of the bottom edge bends (Figure 3(b)).

[0021] Next, the optimum shape of the protection panel 3 (rib 30) was determined by topology analysis. Here, a load was set to simulate the deformation behavior of the protective panel 3 obtained above. As shown in Figure 4, a predetermined load was applied forward to each of the upper ends (Figure 4(a)), lower ends (Figure 4(b)), and the center of the lower end (Figure 4(c)) of the protective panel 3. The optimal shape when the surface of the flat plate model to which this set load was applied was thinned to a predetermined mass was obtained by topology analysis. The analysis results are shown in Figure 5. Figures 5(a) and (b) show the lightened areas (lighter colored areas) when the target mass was reduced by 30% and 50%. As shown in these figures, the optimal shape obtained when the mass was reduced to 50% was a shape similar to the protective panel 3 (rib 30) of this embodiment.

[0022] Next, an analysis for evaluating the shape of the rib 30 will be described. In this analysis, the shape of the protection panel 3 (ribs 30) of this embodiment and the deformation thereof were evaluated based on the amount of deformation of the protection panel 3 itself and the liquid crystal display 2. The analytical model is shown in Figure 6. The analytical model consists of a protective panel 3, an LCD display 2, a front case 11 (only the periphery of the protective panel 3), and double-sided tape (adhering both the top and bottom ends of the LCD main body 21 to the protective panel 3). However, the protective panel 3 was modeled without the hooks 36 and extensions 37. Three analytical models were evaluated: one without the second reinforcing portion R2 (Figure 6(a)), one according to the present embodiment (with the second reinforcing portion R2; Figure 6(b)), and one in which the second reinforcing portion R2 was expanded to the same width as the first reinforcing portion R1 (Figure 6(c)). For each of these analytical models, the amount of deformation was calculated when a predetermined load was applied to a load point P at the bottom center of the protective panel 3.

[0023] The amount of deformation of the liquid crystal display 2 is shown in FIG. As shown in this figure, the presence or absence of the second reinforcing portion R2 does not significantly affect the amount of deformation of the liquid crystal display 2. However, if the second reinforcing portion R2 is extended left and right (i.e., if at least the plurality of second ribs 32 are shaped so that the portion corresponding to the connector portion 22 and the portion corresponding to the liquid crystal main body 21 have the same length in the left and right direction), the amount of deformation of the liquid crystal display 2 can be further suppressed.

[0024] The deformation amount of the protection panel 3 is shown in FIG. As shown in this figure, the presence or absence of the second reinforcing portion R2 does not significantly affect the amount of deformation of the protective panel 3. However, if the second reinforcing portion R2 is extended to the left and right, the amount of deformation of the protective panel 3 can be further suppressed, as with the liquid crystal display 2.

[0025] As described above, according to this embodiment, the protective panel 3 supporting the liquid crystal display 2 has a plurality of ribs 30 erected on the rear surface and a plurality of recesses 35 surrounded by the plurality of ribs 30, and the plurality of recesses 35 include those of non-uniform size. That is, the density of the recesses 35 can be distributed between areas that require more strength (rigidity) and areas that do not. This allows the protective panel 3 to be made lighter while maintaining appropriate rigidity, unlike the conventional method in which uniform patterned ribs are provided. Therefore, the liquid crystal display 2 can be supported in a suitable manner. Here, the "size" of the recess 35 may include the concept of volume taking into account the height of the rib 30 in addition to the area of ​​the recess 35 surrounded by the rib 30.

[0026] Furthermore, according to this embodiment, among the plurality of recesses 35, those arranged near the center in the longitudinal direction of the liquid crystal display 2 are distributed more sparsely than those arranged near both ends in the longitudinal direction. This allows the protection panel 3 to have increased rigidity on both the left and right sides that are subject to a greater load, while reducing the weight of the left and right central portions that are subject to a smaller load.

[0027] Furthermore, according to this embodiment, of the plurality of second ribs 32, the second rib 32b corresponding to the connector portion 22 is shorter in the left-right direction than the second rib 32a corresponding to the liquid crystal body 21. As a result, hooks 36 for engaging lead wires 45 can be provided on the lower portion of protective panel 3 corresponding to connector portion 22. Consequently, lead wires 45 do not get in the way during assembly work, etc., and work efficiency such as assembly is improved compared to when there is no hook 36. Furthermore, it is possible to prevent manufacturing defects such as lead wires 45 getting caught when closing front case 11 and rear case 12, etc.

[0028] Furthermore, according to this embodiment, since the protective panel 3 is made of resin (contains resin), there is no need to insulate, for example, a metal battery spring or the like extending from the battery box. That is, because a metal battery spring does not have a coating, a metal protective panel required insulation treatment at least in the area that comes into contact with the battery spring. In contrast, with a resin (or resin-containing) protective panel 3, even if a battery box 47 that houses a dry cell battery 46 is disposed, as shown in FIG. 9, insulation (coating) treatment is not required, and the battery spring 48 extending from the battery box 47 can be passed over the battery spring. Furthermore, in this case, the battery spring 48 is routed instead of the lead wire 45 of this embodiment, and therefore, as with the lead wire 45, the battery spring 48 can be suitably held down by shortening the second rib 32b in the left-right direction and providing a hook 36. The reason for using battery springs 48 instead of lead wires 45 when using dry batteries 46 is to enable soldering by automated machines and to reduce the assembly time required for wiring. Because the shape of lead wires 45 is easily changed, it takes time to wire them without causing assembly defects. In this regard, when battery springs 48 are used, although the cost of the parts themselves increases slightly, the assembly time can be reduced, resulting in overall cost reduction.

[0029] It goes without saying that the embodiments to which the present invention can be applied are not limited to the above-described embodiments, and various modifications are possible without departing from the gist of the present invention.

[0030] For example, the specific shape (arrangement, position, quantity, etc.) of the multiple ribs 30 (recesses 35) is not limited to that of the above embodiment, and the multiple recesses 35 may be configured to include those of uneven sizes. Furthermore, in this embodiment, mainly based on the results of topology analysis, the pattern of the recesses 35 is such that both ends of the liquid crystal display 2 in the longitudinal direction are dense, but the pattern of the recesses 35 may be such that the center is dense depending on the liquid crystal to be protected or the housing.

[0031] Furthermore, the electronic device according to the present invention is not limited to a scientific calculator (electronic desk calculator), but can be widely applied to electronic devices in general that have a display unit, such as electronic dictionaries and smartphones. Furthermore, the display unit according to the present invention is not limited to a liquid crystal display.

[0032] Although several embodiments of the present invention have been described above, the scope of the present invention is not limited to the above-described embodiments, but includes the scope of the invention described in the claims and its equivalents. The inventions described in the claims originally attached to this application are as follows. The claim numbers described in the appendix are the same as those of the claims originally attached to this application. [Note] <Claim 1> A display unit; a support member that supports a rear surface of the display unit; Equipped with the support member has a plurality of ribs provided upright on a main surface opposite to the display unit, and a plurality of recesses surrounded by the plurality of ribs, The plurality of recesses may have non-uniform sizes. An electronic device characterized by: <Claim 2> Among the plurality of recesses, a plurality of recesses arranged near the center in the longitudinal direction of the display unit are distributed more sparsely than a plurality of recesses arranged near both ends in the longitudinal direction. 2. The electronic device according to claim 1, wherein: <Claim 3> the plurality of ribs include a plurality of first ribs extending obliquely with respect to a first direction corresponding to a short-side direction of the display unit, The plurality of first ribs are arranged asymmetrically with respect to the first direction. 3. The electronic device according to claim 1 or 2. <Claim 4> the plurality of first ribs are arranged symmetrically with respect to a second direction corresponding to the longitudinal direction of the display unit, the second direction being perpendicular to the short-side direction; 4. The electronic device according to claim 3. <Claim 5> the plurality of ribs include a plurality of second ribs parallel to a second direction corresponding to a longitudinal direction of the display unit that is perpendicular to the short-side direction, The plurality of recesses includes recesses defined by the plurality of first ribs and the plurality of second ribs. 4. The electronic device according to claim 3. <Claim 6> The support member includes a resin. 2. The electronic device according to claim 1, wherein: <Claim 7> the display unit has a connector unit on one side in a short-side direction and in a center portion in a long-side direction, the connector portion is spaced farther from the support member than the main body portion of the display portion; the plurality of ribs include a plurality of second ribs parallel to a second direction corresponding to the longitudinal direction; The second ribs have a portion corresponding to the connector portion and a portion corresponding to the main body portion that have the same length in the longitudinal direction. 7. The electronic device according to claim 6. <Claim 8> the display unit has a connector unit on one side in a short-side direction and in a center portion in a long-side direction, the connector portion is spaced farther from the support member than the main body portion of the display portion; the plurality of ribs include a plurality of second ribs parallel to a second direction corresponding to the longitudinal direction; Among the plurality of second ribs, a portion corresponding to the connector portion is shorter in the longitudinal direction than a portion corresponding to the main body portion. 7. The electronic device according to claim 6. <Claim 9> The support member includes a hook for engaging a wire on at least one side in the longitudinal direction of a portion corresponding to the connector portion. 9. The electronic device according to claim 8. <Claim 10> each of the plurality of ribs is positioned based on a result of a topology analysis; 9. The electronic device according to claim 8. [Explanation of symbols]

[0033] 1 Scientific calculator (electronic device) 2 LCD display (display unit) 3 Protective panel (support member) 11 Front case 12 Rear case 21 LCD unit (main unit) 22 Connector part 30 Ribs 31 First Rib 32, 32a, 32b Second rib 33, 33a Third Rib 35 recess 36 Hook 41 Printed Circuit Board H Upper and lower center line V Left and right center line R reinforcement part R1 First reinforcement part R2 2nd reinforcement part

Claims

1. A first electrical component and a second electrical component connected by a wire; a display unit disposed between the first electrical component and the second electrical component; a protective member attached to the rear surface of the display unit; Equipped with the protective member has a rib erected on a main surface opposite to the display unit and a hook for engaging the wire, and the rib is not provided in a location where the hook is provided; An electronic device characterized by:

2. Further comprising a main body case, the display unit, the protective member, the first electrical component, and the second electrical component are housed in the main body case; 2. The electronic device according to claim 1, wherein the electronic device is a semiconductor device.

3. The protective member includes a resin.

3. The electronic device according to claim 1, wherein the first and second electrodes are electrically connected to the first and second electrodes.

4. The ribs are arranged based on the results of topology analysis.

4. The electronic device according to claim 3.

5. Either the first electrical component or the second electrical component is a power source; The wire includes a metal wire connected to the power source.

4. The electronic device according to claim 3.

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