Electronic indicating instrument

Abstract

The electronic indicating instrument (1) has a housing (10) and a cover (30). The housing (10) is mounted on the mounting panel with a portion protruding to the front of the mounting panel, and the substrate (21) is housed inside through an opening (11) protruding from the mounting panel. The cover (30) covers the opening (11) of the housing (10). The housing (10) has sidewalls that are supported by cantilever beams in the area protruding from the mounting panel and extend toward the rear of the mounting panel. Each sidewall has a protrusion at its front end that protrudes toward the interior of the housing (10), and multiple engaging tabs are provided to engage with the substrate (21).

Description

Technical Field

[0001] The present invention relates to an electronic indicating instrument which is installed in a state where a part of the instrument protrudes to the front of the installation panel. Background Art

[0002] Conventionally, an electronic indicating instrument has a substrate on which a plurality of components constituting a circuit are mounted, and the substrate is mounted on a housing of the electronic indicating instrument by, for example, a snap-fit ​​method. For example, Patent Document 1 discloses a technique in which a snap-fitting piece is provided that protrudes from a bottom wall portion of the housing toward a direction along a side wall portion of the housing, and the substrate is mounted on the housing by means of the snap-fitting piece.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2006-90949 Summary of the invention

[0004] However, in the structure in which the substrate is mounted on the frame by means of a snap-fitting snap-fitting piece, the snap-fitting piece is bent when the substrate is mounted on the housing, and a stress corresponding to the magnitude of the bending is applied to the substrate. Moreover, in the technology described in the above-mentioned patent document 1, the snap-fitting piece is protruded from the bottom wall of the housing in a direction along the side wall of the housing. Therefore, if an attempt is made to reduce the stress applied to the substrate when the substrate is mounted on the housing, the length of the snap-fitting piece protruding from the bottom wall of the housing becomes longer, and there is a possibility that the electronic indicating instrument will be enlarged.

[0005] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to obtain an electronic indicating instrument which can suppress enlargement and reduce stress applied to a substrate.

[0006] In order to solve the above-mentioned problems and achieve the purpose, the electronic indicating instrument of the present invention has a housing and a cover. The housing is installed on the mounting panel in a state where a part of the housing protrudes to the front of the mounting panel, and the substrate is stored inside from the opening portion at a position protruding from the mounting panel. The cover covers the opening of the housing. The housing has a side wall portion, which is supported by a cantilever beam in the area protruding from the mounting panel and extends toward the rear of the mounting panel, and has protrusions protruding toward the inside of the housing at the front end, and a plurality of engaging pieces engaged with the substrate are provided.

[0007] Effects of the Invention

[0008] According to the present invention, there is an effect that the stress applied to the substrate can be reduced while suppressing an increase in size. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a perspective view showing the appearance of an example of the electronic indicating instrument according to the first embodiment of the present invention.

[0010] Figure 2This is a diagram showing a state where the electronic indicating instrument according to the first embodiment is mounted on a mounting panel.

[0011] Figure 3 This is a perspective view of the appearance of the casing involved in Embodiment 1.

[0012] Figure 4 It is a side view of the casing involved in Embodiment 1.

[0013] Figure 5 This is a front view of the casing according to Embodiment 1.

[0014] Figure 6 This is a perspective view showing the appearance of a partial region of the casing according to the first embodiment.

[0015] Figure 7 This is a side view showing a part of the casing according to the first embodiment.

[0016] Figure 8 is along Figure 7 A cross-sectional view taken along line VIII-VIII is shown.

[0017] Fig. 9 This is a diagram for explaining a process of mounting the substrate unit according to the first embodiment to the housing.

[0018] Fig.10 This is a diagram for explaining stress applied to the substrate by the engaging piece when it is assumed that the engaging piece is projected toward the opening from the bottom wall of the case according to the first embodiment.

[0019] Fig.11 This is a diagram for explaining stress applied to the substrate by the engaging piece according to the first embodiment.

[0020] Fig.12 It is a side view of the electronic indicating instrument according to the first embodiment.

[0021] Fig.13 is along Fig.12 A cross-sectional view taken along line XIII-XIII is shown.

[0022] Fig.14 yes Fig.13 A partial enlarged view of . DETAILED DESCRIPTION

[0023] Hereinafter, an electronic indicating instrument according to an embodiment of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the embodiment.

[0024] Implementation method 1.

[0025] Figure 1This is a perspective view showing the appearance of an example of the electronic indicating instrument according to the first embodiment of the present invention. Figure 2 This is a diagram showing a state where the electronic indicating instrument according to the first embodiment is mounted on a mounting panel.

[0026] Figure 1 and Figure 2 The electronic indicating instrument 1 shown measures electrical values ​​such as voltage, current or power of a circuit and displays the measurement results. For example, the electronic indicating instrument 1 measures the current, voltage and power supplied from the power system to the user and displays the measurement results.

[0027] like Figure 1 As shown, the electronic indicating instrument 1 includes: a housing 10 formed of an insulating member such as resin; a substrate unit 20 accommodated in the housing 10 ; and a cover 30 embedded in the housing 10 to cover the opening 11 of the housing 10 .

[0028] The substrate unit 20 includes a substrate 21 and a substrate support portion 22 that supports the substrate 21. The substrate unit 20 is inserted from the opening portion 11 of the housing 10 and mounted on the housing 10. The opening portion 11 of the housing 10 in a state where the substrate unit 20 is mounted on the housing 10 is covered by the cover 30, thereby assembling the electronic indicating instrument 1.

[0029] The cover 30 includes a cover frame 31, a display unit 32 provided on the front surface side of the cover frame 31, and a plurality of operation buttons 33. A plurality of components constituting a circuit are arranged on the substrate 21. The circuit measures electrical values ​​such as voltage, current, or power and displays the measurement results on the display unit 32. The circuit can switch the information displayed on the display unit 32 based on the operation of the operation button 33.

[0030] like Figure 2 As shown in the figure, the electronic indicating instrument 1 is mounted on the mounting panel 40 in a state where a part of it protrudes to the front of the mounting panel 40. The housing 10 is provided with a protruding portion 16 that protrudes in the outer circumferential direction on the side of the opening 11. By making the protruding portion 16 abut against the mounting surface 40a of the mounting panel 40, the electronic indicating instrument 1 can be easily mounted on the mounting panel 40 in a state where a part of it protrudes to the front of the mounting panel 40.

[0031] The cover 30 is disposed forward of the mounting surface 40a of the mounting panel 40 when the electronic indicating instrument 1 is mounted on the mounting panel 40. The cover 30 is detachable from the housing 10 when the electronic indicating instrument 1 is mounted on the mounting panel 40.

[0032] Figure 3This is a perspective view of the appearance of the casing involved in Embodiment 1. Figure 4 It is a side view of the casing involved in Embodiment 1. Figure 5 This is a front view of the casing according to Embodiment 1. Figure 6 This is a perspective view showing the appearance of a partial region of the casing according to the first embodiment. Figure 7 is a side view showing a portion of the housing according to Embodiment 1, Figure 4 An enlarged view of area 70 is shown. Figure 8 is along Figure 7 A cross-sectional view taken along line VIII-VIII is shown.

[0033] like Figure 3 to Figure 5 As shown, the housing 10 includes: a housing frame 12 having an opening 11; and a substrate support portion 15 that supports the substrate 21. The housing frame 12 includes a bottom wall portion 13 and a side wall portion 14. The substrate support portion 15 is formed inside the housing frame 12 and protrudes from the bottom wall portion 13 toward the opening 11.

[0034] The side wall 14 includes a plurality of side wall portions 141, 142, 143, and 144. The side wall portions 141 and 142 are disposed at positions opposite to each other, and the side wall portions 143 and 144 are disposed at positions opposite to each other. A plurality of engagement pieces 5 supported by cantilever beams are formed in the area protruding from the mounting panel 40 in each of the side wall portions 141 and 142.

[0035] For example, in Figure 4 , a plurality of engaging pieces 5 are shown that form a cantilever beam support in a region 142a of the side wall portion 142 that protrudes from the mounting panel 40. Figure 6 , a plurality of engagement pieces 5 are shown that form cantilever beam support in a region 141a of the side wall portion 141 that protrudes from the mounting panel 40. These plurality of engagement pieces 5 extend toward the rear of the mounting panel 40, that is, toward the bottom wall portion 13 of the housing frame 12.

[0036] like Figure 6 to Figure 8 As shown, each engaging piece 5 has a support end 51, and the support end 51 is continuous with a corresponding area of ​​the area 141a, 142a in the side wall portion 14 protruding from the mounting panel 40. In addition, each engaging piece 5 has: an extension portion 52, whose base end is continuous with the support end 51 and extends toward the rear of the mounting panel 40; and a protruding portion 53, which is continuous with the front end of the extension portion 52 and protrudes toward the inside of the housing frame 12. The engaging piece 5 is formed by forming a U-shaped slit 6 in the side wall portion 14.

[0037] The extension portion 52 has elasticity and bends when a force in a direction perpendicular to the wall surface of the side wall portion 14 acts. As described above, the extension portion 52 bends due to the force from the outside, so it can also be called a bending column. Figure 6 and Figure 8 As shown in FIG. 1 , the substrate 21 includes an inclined surface 53a that protrudes toward the inside of the housing 10 as it moves toward the rear of the mounting panel 40, and a substrate support surface 53b that supports the substrate 21. The inclined surface 53a has the function of guiding the substrate 21 and can also be called a guide surface. The substrate support surface 53b is a flat surface that abuts against the main surface 21a of the substrate 21 when the substrate 21 is mounted in the housing 10.

[0038] Here, a process of attaching the substrate unit 20 to the housing 10 will be described. Fig. 9 1 is a diagram for explaining the process of mounting the substrate unit to the housing according to the first embodiment. Fig. 9 In order to facilitate understanding, only the substrate 21 of the substrate unit 20 is shown.

[0039] like Fig. 9 As shown, an opening 91 is formed between the engaging piece 5 formed on the side wall portion 141 and the engaging piece 5 formed on the side wall portion 142. The width W1 of the opening 91 is the distance between the inclined apex 53c of the protruding portion 53 of the engaging piece 5 supported by the cantilever beam of the side wall portion 141 and the inclined apex 53c of the protruding portion 53 of the engaging piece 5 supported by the cantilever beam of the side wall portion 142 in the direction in which the side wall portion 141 and the side wall portion 142 are opposite to each other.

[0040] like Fig. 9 As shown, if the substrate 21 is inserted from the opening 11 of the housing 10 and continuously moved toward the bottom wall 13 of the housing 10, the two side ends of the substrate 21 contact the inclined surface 53a formed on the protrusion 53 of the locking piece 5. If the substrate 21 is further moved toward the bottom wall 13 of the housing 10 in this state, the extension 52 is continuously displaced toward the outside of the side wall 14 due to the elasticity of the extension 52, and the width W1 of the opening 91 is continuously displaced. Therefore, the width W1 of the opening 91 increases. At this time, the stress applied to the substrate 21 is proportional to the displacement of the width W1 of the opening 91, and the greater the displacement of the width W1 of the opening 91, the greater the stress.

[0041] When the substrate 21 passes the inclined apex 53c of the protrusion 53, the force applied from the substrate 21 to the protrusion 53 of the engagement piece 5 disappears. Therefore, the width W1 of the opening 91 is restored to the state before the substrate 21 is inserted into the housing 10 by the elasticity of the extension 52 of the engagement piece 5. Furthermore, the substrate 21 that has passed the inclined apex 53c of the protrusion 53 is fixed between the substrate support surface 53b of the protrusion 53 and the substrate support portion 15.

[0042] As described above, when the opening 91 is displaced when the substrate 21 is mounted on the housing 10, the stress applied to the substrate 21 is proportional to the displacement of the width W1 of the opening 91, but becomes smaller in inverse proportion to the cube of the insertion depth D1 of the substrate 21 into the housing 10 with the support end 51 of the engaging piece 5 as the base point. Therefore, by increasing the length of the extension portion 52, the distance from the support end 51 to the inclined vertex 53c is increased, thereby effectively alleviating the stress applied to the substrate 21 when the substrate 21 is mounted on the housing 10.

[0043] The engaging piece 5 is cantilevered in the regions 141a and 142a of the side wall portion 14 protruding from the mounting panel 40 and extends toward the rear of the mounting panel 40. Thus, for example, in a situation where the engaging piece 5 cannot be lengthened when the engaging piece 5 is made to protrude from the bottom wall portion 13 toward the opening portion 11, the engaging piece 5 can be cantilevered in the regions 141a and 142a of the side wall portion 14, thereby making it possible to lengthen the engaging piece 5. Therefore, it is possible to suppress the electronic indicating instrument 1 from being enlarged and reduce the stress applied to the substrate 21.

[0044] Fig.10 This is a diagram for explaining stress applied to the substrate by the engaging piece when it is assumed that the engaging piece is projected from the bottom wall portion of the housing according to the first embodiment toward the opening portion.

[0045] Fig.11 This is a diagram for explaining stress applied to the substrate by the engaging piece according to the first embodiment.

[0046] exist Fig.10 As shown in the engaging piece 5', the deeper the insertion depth of the substrate 21 into the housing 10 becomes, the closer the substrate 21 is to the supporting end 51' side of the engaging piece 5'. Therefore, the deeper the insertion depth of the substrate 21 into the housing 10 becomes, the greater the stress applied to the substrate 21 by the bending of the extension 52' becomes. In addition, the inclined surface 53a' of the protrusion 53' formed at the front end of the engaging piece 5' is inclined in a direction away from the extension 52' toward the insertion direction of the substrate 21. Therefore, in Fig.10 In the illustrated engaging piece 5 ′, a distance L2 from the supporting end 51 ′ of the inclined apex 53 c ′ formed at the protruding portion 53 ′ is shorter than a length L1 of the engaging piece 5 ′.

[0047] In the engaging piece 5 involved in the first embodiment, Fig.11As shown in FIG. 1 , the deeper the insertion depth of the substrate 21 into the housing 10 becomes, the closer the substrate 21 is to the front end side of the engaging piece 5. Therefore, the deeper the insertion depth of the substrate 21 into the housing 10 becomes, the smaller the stress applied to the substrate 21 by the deflection of the extension 52 becomes. In addition, the engaging piece 5 is formed such that the inclined surface 53a of the protruding portion 53 formed at the front end is inclined in a direction away from the extension 52 toward the insertion direction of the substrate 21, but the distance of the inclined top 53c formed at the protruding portion 53 from the support end 51 is equal to the length L of the engaging piece 5.

[0048] As described above, the deeper the insertion depth of the engaging piece 5' into the housing 10 becomes, the greater the stress applied to the substrate 21 by the bending of the extension 52' becomes. However, the deeper the insertion depth of the engaging piece 5' into the housing 10 becomes, the smaller the stress generated by the bending of the extension 52 becomes. In addition, if it is assumed that Fig.10 The length L1 of the engaging piece 5' is shown Fig.11 If the length L of the engaging piece 5 shown is the same, when the front ends of the engaging pieces 5 and 5' are displaced by the displacement amount I1, the force P1' applied to the engaging piece 5' is greater than the force P1 applied to the engaging piece 5. Therefore, the engaging piece 5 involved in the first embodiment can reduce the stress applied to the substrate 21 compared with the engaging piece 5'.

[0049] In addition, since the support end 51 of the engaging piece 5 is disposed at a position protruding forward from the mounting panel 40 in the side wall portion 14, the position of the engaging piece 5 can be shifted forward compared to the case where the engaging piece 5 is assumed to protrude from the bottom wall portion 13. Therefore, the length of the electronic indicating instrument 1 in the depth direction can be shortened compared to the case where the engaging piece 5 is assumed to protrude from the bottom wall portion 13, and the electronic indicating instrument 1 can be miniaturized.

[0050] Furthermore, when it is desired to prioritize product miniaturization over the force for holding the substrate 21 in the housing 10, i.e., the substrate holding force, the cross-sectional area of ​​the extension portion 52 of the engaging piece 5 can be reduced within a range that can ensure the necessary strength, and the length of the extension portion 52 can be shortened. Thus, the length from the mounting surface 40a to the bottom wall portion 13 can be shortened, and miniaturization of the electronic indicating instrument 1 can be achieved.

[0051] Furthermore, when it is desired to reduce the stress applied to the substrate 21, that is, the substrate stress, in priority to the substrate holding force, the cross-sectional area of ​​the extension portion 52 of the engagement piece 5 can be reduced within a range that can ensure the necessary strength. This can shorten the length of the electronic indicating instrument 1 in the depth direction, and can achieve miniaturization of the electronic indicating instrument 1.

[0052] Furthermore, after inserting the substrate unit 20 including the substrate 21 from the opening 11 of the housing 10 , the cover 30 is fitted into the housing 10 , so that the electronic indicating instrument 1 can be easily assembled.

[0053] In addition, by increasing the length of the engaging piece 5, the force applied to the substrate 21 by the engaging piece 5 can be reduced in the process of fixing the substrate 21 to the housing 10, and the substrate 21 can be easily fixed to the housing 10 with a light force. In addition, the vibration and sound returned by the substrate support surface 53b at the moment when the substrate 21 exceeds the inclined apex 53c can easily recognize the completion of the insertion process.

[0054] In addition, when the substrate 21 is fixed to the housing 10, the stress generated by the bending of the extension portion 52 in the engaging piece 5 does not apply stress to the substrate 21, so the stress applied to the substrate 21 does not change depending on the operator's work level. Therefore, the operator performs the assembly work in the determined order, thereby not generating stress exceeding the specified value on the substrate 21, and can improve workability.

[0055] Fig.12 It is a side view of the electronic indicating instrument according to the first embodiment. Fig.13 is along Fig.12 A cross-sectional view taken along line XIII-XIII is shown. Fig.14 yes Fig.13 A partial enlarged view of Fig.13 An enlarged view of area 71 is shown.

[0056] like Figure 12 to Figure 14 As shown, the cover 30 has a displacement suppressing portion 34, which is opposite to the plurality of engaging pieces 5 on the outside of the side wall portion 14 and suppresses displacement to the outside of the side wall portion 14 by abutting against the plurality of engaging pieces 5. The displacement suppressing portion 34 has a plurality of ribs 34a, which extend toward the mounting surface 40a and respectively oppose to corresponding engaging pieces 5 among the plurality of engaging pieces 5 on the outside.

[0057] Each rib 34a is opposite to the region from the support end 51 to the middle of the extension portion 52 in the engagement piece 5. In other words, each rib 34a is opposite to the region in front of the mounting surface 40a in the engagement piece 5. Thus, when a force toward the outside of the side wall portion 14 acts on the engagement piece 5, the region from the support end 51 to the middle of the extension portion 52 in the engagement piece 5 presses the rib 34a.

[0058] like Fig.14 As shown in FIG. 1 , the thickness T1 of the rib 34a is thicker than the thickness T2 of the engaging piece 5. Fig.14In the example shown, the thickness T1 of the rib 34a is more than twice the thickness T2 of the engagement piece 5. As described above, the thickness T1 of the rib 34a is thicker than the thickness T2 of the engagement piece 5, so when a force is applied to the protrusion 53 of the engagement piece 5 from the outside, the displacement of the region from the support end 51 to the middle of the extension portion 52 in the engagement piece 5 is prevented by the rib 34a.

[0059] Therefore, when a force is applied to the protrusion 53 of the engagement piece 5 from the outside, the area of ​​the engagement piece 5 that is not opposite to the rib 34a mainly becomes the area that is displaced to the outside of the side wall 14, so the displaced area becomes shorter. As a result, compared with the case where the cover 30 is not provided with the displacement suppressing portion 34, the force required to displace the protrusion 53 of the engagement piece 5 to the outside becomes larger, so the fixing strength of the substrate 21 to the housing 10 can be improved.

[0060] Furthermore, by making the outer surface of the side wall portion 14 and the outer surface of the engaging piece 5 substantially coplanar with the surface of the displacement suppressing portion 34, the extending portion 52 of the engaging piece 5 can be suppressed from bending outward due to the stress applied from the substrate 21 to the substrate supporting surface 53b by the displacement suppressing portion 34. Therefore, the fixing strength of the substrate 21 to the housing 10 can be further improved.

[0061] In addition, the load generated by the substrate 21 due to the fastening to the terminal block is arranged to be located on the inner side of the housing 10 compared to the center of gravity of the extension portion 52, so that when the load from the substrate 21 is applied to the substrate support surface 53b, the extension portion 52 is bent into a convex shape toward the outside of the side wall portion 14. Therefore, the extension portion 52 continuously applies a load to the rib portion 34a, so that the extension portion 52 and the rib portion 34a are closely attached, and the fixing strength of the substrate 21 to the housing 10 can be further improved. In addition, the center of gravity of the extension portion 52 is the center of gravity of the extension portion 52 in the direction orthogonal to the main surface 21a of the substrate 21.

[0062] Furthermore, the displacement suppressing portion 34 covers from the outside the area exposed forward from the mounting surface 40a of the mounting panel 40 in the slit 6 formed in the side wall portion 14. Thus, even when the supporting end 51 of the engaging piece 5 is located forward of the mounting surface 40a of the mounting panel 40, foreign matter such as insects and dust can be prevented from entering the interior of the electronic indicating instrument 1 through the slit 6.

[0063] Furthermore, when the housing 10 and the cover 30 are fitted together, the displacement suppressing portion 34 is formed on the cover frame 31 so that the front end of the rib 34a of the displacement suppressing portion 34 is substantially flush with the mounting surface 40a of the mounting panel 40. Thus, the slit 6 is covered by the displacement suppressing portion 34 in a sealed state, and thus foreign matter such as insects and dust can be prevented from entering the interior of the electronic indicating instrument 1 through the slit 6 with high accuracy.

[0064] As described above, the electronic indicating instrument 1 according to the first embodiment includes the housing 10 and the cover 30. The housing 10 is mounted on the mounting panel 40 in a state where a portion of the housing 10 protrudes to the front of the mounting panel 40, and the substrate 21 is accommodated inside from the opening 11 at a position protruding from the mounting panel 40. The cover 30 covers the opening 11 of the housing 10. The housing 10 includes the side wall 14, which is cantilevered in the regions 141a and 142a protruding from the mounting panel 40 and extends toward the rear of the mounting panel 40, and has the protrusions 53 protruding toward the inside of the housing 10 at the front end, forming a plurality of engagement pieces 5 that engage with the substrate 21. Thus, it is possible to suppress the electronic indicating instrument 1 from being enlarged, and reduce the stress applied to the substrate 21.

[0065] In addition, the cover 30 has a displacement suppressing portion 34, which is opposite to the plurality of engaging pieces 5 on the outside of the side wall portion 14, and is in contact with the plurality of engaging pieces 5, thereby suppressing displacement to the outside of the side wall portion 14. As a result, the force required to remove the substrate 21 from the housing 10 is increased, so when the substrate 21 is inserted into the housing 10, the stress applied to the substrate 21 can be effectively relieved, and the release of the fixation of the substrate 21 by the housing 10 due to unexpected force can be suppressed.

[0066] The side wall 14 has a plurality of slits 6 provided to form a plurality of engagement pieces 5. The displacement suppressing portion 34 covers the plurality of slits 6 from the outside of the side wall 14. This prevents foreign matter such as insects and dust from entering the electronic indicating instrument 1 through the slits 6.

[0067] In addition, the protrusion 53 has an inclined surface 53a which is inclined toward the inside of the housing 10 as it goes toward the rear of the mounting panel 40. Thus, the stress applied to the substrate 21 can be reduced.

[0068] In addition, the housing 10 includes a substrate support portion 15 that contacts one main surface 21a of the substrate 21. The protrusion 53 includes a substrate support surface 53b that faces the other main surface 21b of the substrate 21 and supports the substrate 21 together with the substrate support portion 15. Thus, for example, when a force is applied from the substrate 21, the direction of the force becomes a direction along the extending direction of the engaging piece 5, and the force required for removing the substrate 21 from the housing 10 can be made greater than the force required for fixing the substrate 21 to the housing 10. Therefore, the substrate 21 can be stably fixed to the housing 10.

[0069] The configuration described in the above embodiment is an example of the content of the present invention, and can be combined with other known technologies. Part of the configuration can be omitted or changed without departing from the scope of the present invention.

[0070] Description of the label

[0071] 1 electronic indicating instrument, 5, 5' engaging piece, 6 slit, 10 housing, 11 opening, 12 housing frame, 13 bottom wall, 14, 141, 142, 143, 144 side wall, 15, 22 substrate supporting part, 16 extension part, 20 substrate unit, 21 substrate, 21a, 21b main surface, 30 cover, 31 cover frame, 32 display part, 33 operation button, 34 displacement suppression part, 34a rib, 40 mounting panel, 40a mounting surface, 51, 51' supporting end, 52, 52' extension part, 53, 53' protruding part, 53a, 53a' inclined surface, 53b substrate supporting surface, 53c, 53c' inclined apex, 70, 71, 141a, 142a area, 91 opening, D1 depth, I1 displacement amount, L2 distance, P1, P1' force, T1, T2 thickness.

Claims

1. An electronic indicating instrument, characterized in that: have: a housing mounted on the mounting panel in a state where a portion of the housing protrudes to the front of the mounting panel, and accommodating the substrate inside the housing through an opening located at a position protruding from the mounting panel; as well as a cover covering the opening of the housing, The housing has a side wall portion, which is provided with a plurality of engaging pieces engaged with the substrate, the engaging pieces including a supporting end, a protruding portion and an extending portion, the extending portion being supported by a cantilever beam in a region protruding from the mounting panel and extending toward the rear of the mounting panel, the protruding portion protruding toward the interior of the housing frame, The cover has a displacement suppressing portion, which is opposite to the plurality of engagement pieces on the outside of the side wall portion and is in contact with the plurality of engagement pieces to suppress displacement to the outside of the side wall portion. The displacement suppressing portion has a plurality of ribs extending toward the mounting surface and facing the corresponding engaging pieces among the plurality of engaging pieces on the outside, respectively. The rib is thicker than the engaging piece.

2. The electronic indicating instrument according to claim 1, wherein: The side wall portion has a plurality of slits forming the plurality of engaging pieces, The displacement suppressing portion covers the plurality of slits from the outside of the side wall portion.

3. The electronic indicating instrument according to claim 1 or 2, wherein: The protrusion has an inclined surface, and the inclined surface is more inclined toward the interior of the housing as it moves toward the rear of the mounting panel.

4. The electronic indicating instrument according to claim 3, wherein: The housing includes a substrate supporting portion that abuts against one main surface of the substrate. The protruding portion has a substrate supporting surface that faces the other main surface of the substrate and supports the substrate together with the substrate supporting portion.

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