JP5040979B2 - Electric equipment display device mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an arrangement configuration that can achieve reduction in number of components and facilitation of display device mounting, and to put a display device closer to a housing end. <P>SOLUTION: A mounting structure 32 for mounting one end side of the display device 25 and a side of a housing 22 is formed of an insertion recessed part 33 which is formed inside an upper wall part 22b nearby a display window 23 in the housing 22 and recessed to be open inwardly in the housing 22, and a locked piece part 34, made of a steel plate, that protrudes outward from one end of the display device 25 and has its tip side obliquely bent leaving an inner surface of a front wall part 22a of the housing 22, the bending size being determined in accordance with a target compression thickness Tp of a gasket 27. The tip of the locked piece part 34 of the display device 25 is inserted into the insertion recessed part 33 of the housing 22 to be locked, thereby mounting the one end side of the display device 25 on an inner surface of a peripheral edge part of the display window 23 of the housing 22. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a display device mounting structure for an electrical device in which the display device is mounted on a casing of the electrical device in a water-sealed state via a packing.

  Recently, there is an electric device such as an authentication device or a security device incorporated in a wall of a building, in which a display device is incorporated in the housing of the electric device. In this case, the display is displayed from the display window of the housing. The display surface of the device is exposed. In such an electric device, since it may be exposed to wind and rain outdoors, in consideration of waterproofness, a configuration in which packing is interposed between the inner surface of the peripheral edge of the display window and the periphery of the front surface of the display device is adopted. There is something. This display device mounting structure is shown in FIG. In FIG. 14, screw bosses 3, 3 for attaching a display device are erected on the inner surface of the display window 2 of the housing 1, and the display device 5 is attached with a frame-shaped packing 4 attached to the peripheral edge of the front surface. The portion 5a is attached and fixed to the front end surface of the screw boss 3 by screws 6 and 6.

In this case, the packing 4 is compressed and deformed in the thickness direction by attaching the display device 5.
In addition, there exists a technique of patent document 1 as a water seal structure substantially the same as this FIG.

  In the technique described in Patent Document 1, a screw boss is erected on the inner surface of the peripheral portion of the display window of the casing, and a packing is disposed between the inner surface of the peripheral portion of the display window and the front surface of the display device. The display device is fixed to the screw boss with a screw.

JP 2005-33290 A

  By the way, in any of the display device mounting structures described above, the display device is fixed to the housing by a plurality of screws, so that the number of parts is large and the number of screw tightening points is large, and the mounting work is troublesome. Furthermore, there is a demand for an arrangement in which the display device is arranged close to the end of the housing in order to reduce the size of the housing. However, in the configuration in which all the display devices are screwed, the above-described configuration shown in FIG. As can be seen, a relatively large space S for the screw boss is required between the display device 5 and the housing end 1a, and the display device 5 cannot be brought closer to the housing end 1a. It was a fact.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an arrangement that can reduce the number of components and simplify the mounting of the display device and can bring the display device closer to the end of the housing. An object of the present invention is to provide a display device mounting structure for electrical equipment.

The present invention has been made through the following process.
That is, first, in order to reduce the number of parts such as screws and to bring the display device closer to the end portion of the casing, the inventor, as shown in Reference FIG. As attachment means 12 for attaching the end portion of the housing 13 to the end of the housing 13, the insertion recess 14 is formed in the upper side wall portion 13 a of the plastic housing 13, and the steel plate is engaged with the display device 11. A configuration is considered in which the portion 15 is provided in a projecting manner and the locked piece 15 is inserted and disposed in the insertion recess 14.

  In this configuration, the one end side of the display device 11 is placed in the housing 13 in a state where the packing 16 is compressed and deformed by inserting the locked piece 15 into the insertion recess 14 and locking it to the inner surface 14a. The display window 17 is attached to the inner surface of the peripheral portion. By simply inserting the locked piece 15 into the insertion recess 14 in this way, one end side of the display device 11, that is, the end side that is the end of the housing 13 can be attached, and the number of components can be reduced. Moreover, the display device 11 can be arranged close to the end of the housing 13. In addition, if the other end part side of the display apparatus 11 is attached by the appropriate attachment means 8 (in this case, the attachment means by a screw) after inserting this to-be-latched piece part 15 in the insertion recessed part 14, the display apparatus 11 will be attached. Complete.

  However, in the configuration shown in FIG. 12, when the display device 11 is held in the narrow housing 13 and the locked piece 15 is inserted into the insertion recess 14, as shown in FIG. Therefore, even if the display device 11 is held slightly obliquely and moved in the direction of the arrow D as it is, the locked piece portion 15 is difficult to enter the insertion concave portion 14, and therefore the locked piece portion 15 is held in the insertion concave portion. In order to insert into the display 14, the other end portion of the display device 11 must be moved in the direction of arrow D while being displaced in the direction of arrow E, and the insertion workability is poor. Although a measure for improving the width dimension W of the insertion recess 14 can be considered, the insertion workability is improved in this case, but the compression thickness of the packing 16 deviates from the target value, and the insertion workability and the packing compression thickness are reduced. Cannot balance maintenance.

  Further, in the case of FIG. 12, the I dimension of the housing 13 (from the inner surface of the wall 13b where the display window 16 exists in the housing 13 to the locking portion 14a with respect to the locked piece 15 of the insertion recess 14). The compression thickness dimension Tp of the packing 16 is determined by the dimension), but the I dimension has a dimensional error with respect to the target value in the initial design stage due to a manufacturing error of the casing 13 made of plastic. And there exists a possibility that compression thickness dimension Tp may shift | deviate from target value. In this case, it is practically difficult to adjust the error of the insertion recess 14 itself because it is necessary to review the entire design and manufacture of the housing 13. In particular, in electrical devices such as security devices and authentication devices, since the devices themselves are small, the free thickness of the packing is as small as millimeters, and the dimensions for setting the above-mentioned compression thickness to the desired target value. It is very difficult to make the casing 13 have accuracy.

  In order to solve the above-described conventional problems and the above-mentioned problems, the display device mounting structure for an electric device according to claim 1 includes a plastic case having a rectangular box shape and a display window formed on one wall portion, and one surface portion. A display device having a display surface, a packing attached to a peripheral portion of the one surface portion of the display device or a peripheral portion of a display window of the housing, and one end side and the other end side of the display device, In a display device mounting structure for an electrical device, comprising a mounting means for mounting the packing on the inner surface of the casing so as to compressively deform the packing between the peripheral portion of the one surface portion of the display device and the inner surface of the display window peripheral portion. The mounting means for attaching the one end side of the display device to the housing has a concave shape that is formed on the inside of the side wall near the display window of the one wall and opens to the inside of the housing. Insertion recess to be made and the above table Projected outward from the one end of the apparatus and bent at an angle so that the tip side is away from the inner surface of the one wall, and the bending dimension is the compression thickness dimension targeted for the packing (the value obtained by subtracting the shrinkage allowance from the packing free thickness) ) Or a latched piece portion made of steel plate determined according to the contraction allowance, and the distal end of the latched piece portion of the display device is inserted and locked in the insertion recess of the housing. The display device is characterized in that one end portion of the display device is attached to the inner surface of the display window peripheral portion of the housing.

  According to this configuration, since the locked piece provided at one end of the display device is inserted and locked into the insertion recess of the housing, and the one end of the display device is attached to the housing, the entire display device The number of parts used for mounting can be reduced. In addition, the display device can be arranged close to the end of the housing. Furthermore, since the latched piece part is bent obliquely so that it protrudes outward from one end of the display device and the tip side is away from the inner surface of the wall of the housing, the operator puts the display device in an oblique state. When the holding piece portion is inserted into the insertion recess, the orientation direction of the locking piece portion substantially coincides with the opening direction of the insertion recess, and the operator can leave the display device as it is. If it is moved in the direction of the insertion recess, the locked piece is naturally inserted into the insertion recess and locked. Accordingly, the insertion workability of the locked piece portion is simplified.

  Further, since the to-be-latched piece portion is bent obliquely so that the tip end side thereof is separated from the inner surface of the one wall portion, the bending dimension is determined according to the compression thickness dimension or the reduction allowance targeted for the packing. When the locking piece is inserted into the insertion recess and locked, the bent tip of the locked piece presses the locking portion of the insertion recess. As a result, the packing is compressed as a reaction force. The Therefore, by setting or adjusting the bending dimension of the locked piece made of steel plate, the compression thickness or shrinkage of the packing can be adjusted to the desired target value on the display device side, and the packing side can be adjusted on the casing side. Unlike the case of adjusting the compression thickness or reduction allowance, the adjustment becomes extremely simple.

  The display device mounting structure for an electric device according to claim 2 is characterized in that, in claim 1, the target compression thickness dimension of the packing is Tp [mm], and the locked portion is inserted into the insertion recess from the inner surface of one wall portion of the casing. The distance from the one part to the locking part is Tk [mm], the distance from the one surface part of the display device to the base of the locked part is Tm [mm], and the bending dimension of the locked part is Is defined as Tb [mm], the bending dimension Tb [mm] of the locked piece portion is determined by the following equation (1).

Tb = Tk−Tm−Tp (1)
According to this, if the distance Tk in the housing and the distance Tm in the display device are known, the bending dimension Tb of the locked piece portion can be calculated according to the compression thickness dimension Tp targeted for the packing. When the display device is attached to the housing, the packing can be naturally compressed to the target compression thickness dimension Tp, and the desired water sealing effect can be obtained.

  According to a third aspect of the present invention, there is provided a display device mounting structure for an electrical device according to the second aspect, wherein the thickness of the packing in a free state is A [mm] from the inner surface of one wall portion of the housing to the locking portion. This distance Tk is characterized by a dimension obtained by adding the thickness dimension A in the free state of the packing and the distance Tm from one surface portion of the display device to the base end of the locked piece portion.

According to this, when Tk = A + Tm is substituted into the above equation (1),
Tb = A−Tp, that is, the bending dimension Tb is a value obtained by subtracting the target compression thickness dimension Tp from the free thickness dimension A of the packing, that is, a packing contraction allowance. It becomes 1: 1 and it becomes very easy to set and adjust the compression thickness dimension and shrinkage allowance of the packing.

  According to a fourth aspect of the present invention, there is provided a display device mounting structure according to any one of the first to third aspects, wherein the insertion recess is formed of a cylindrical portion or a hole formed in a side wall near the display window. According to this, when attaching a display apparatus other end part side in the state which inserted the to-be-latched piece part in the insertion recessed part, it can prevent that this to-be-latched piece part remove | deviates from an insertion recessed part.

  According to a fifth aspect of the present invention, there is provided the electronic device display device mounting structure according to any one of the first to third aspects, wherein the insertion recess is protruded from the side wall near the display window so as to be substantially parallel to the inner surface of the one wall. It is characterized by the fact that it is constituted by the opposing space portion of the two rib portions. According to this, the insertion recess can be configured easily.

The 1st Embodiment of this invention is shown and the partial vertical section side view of an authentication apparatus is shown. Appearance perspective view of authentication device Broken perspective view of the housing from below Broken perspective view of insertion recess Perspective view of the display device as seen from the front Perspective view of the display device from the rear Vertical side view showing the state before the display device is mounted Vertical side view showing how the display device is mounted (Part 1) Vertical side view showing the state of display device installation (Part 2) The vertical side view of the insertion recessed part which shows the 2nd Embodiment of this invention FIG. 4 equivalent view showing the third embodiment of the present invention 1 equivalent diagram showing a reference example Vertical side view showing how the display device is mounted 1 equivalent diagram showing a conventional example

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, FIG. 2 shows an authentication device 21 corresponding to an electric device in a perspective state, and FIG. 1 shows a cross-sectional state. The authentication device 21 is used in, for example, an entry / exit management system that reads an IC card, and is embedded in a building wall leaving the front surface of the housing 22. The casing 22 of the authentication device 21 is made of plastic, has a rectangular box shape, and a display window 23 is formed on a front wall portion 22a as one wall portion. The display window 23 has a rectangular shape and is formed at a position close to the upper side wall portion 22 b of the housing 22.

  In addition, a reading display unit 24 indicating an IC card reading position is provided in a portion below the display window 23 in the front wall portion 22 a of the housing 22, and on the back side of the reading display unit 24. Although not shown, a reading control unit that communicates with the IC card and reads communication data including an ID or the like is provided.

  One end (upper end 25 b) side and the other end (lower end 25 c) side of the display device 25 are attached to the inner surface of the display window 23 of the housing 22 by attaching means 32 and 28 described later. The display device 25 has a rectangular shape, and a display surface 26 is provided on a front surface portion 25a as one surface portion thereof. A rectangular frame-shaped packing 27 is attached in advance to the peripheral edge portion of the front surface portion 25a by, for example, adhesion.

  The attachment means 28 for attaching the lower end 25c side, which is the other end side of the display device 25, to the housing 22 will be described. The attachment means 28 is formed integrally with a screw boss 29 formed integrally with the left portion (left portion as viewed from the inner surface side of the housing 22) and the right portion of the inner surface of the front wall portion 22 a of the housing 22. 29 (see FIG. 1 and FIG. 3) and the left and right portions of the lower end 25c of the display device 25 are attached pieces 30 made of steel plate that protrude outward (downward) from the lower end 25c. 30 (see FIGS. 5 and 6) and screws 31 and 31. Screw holes 29a and 29a are formed from the front end surfaces of the screw bosses 29 and 29 toward the base end portion. The attached piece 30 is provided with a screw insertion groove 30a.

  Next, attachment means 32 for attaching the upper end 25b side, which is one end side of the display device 25, to the housing 22 will be described. This attachment means 32 is comprised from the insertion recessed parts 33 and 33 (refer FIG. 1, FIG. 3) and the to-be-latched piece parts 34 and 34 (refer FIG. 5, FIG. 6). The insertion recesses 33 and 33 are formed on the left and right sides inside the upper side wall 22b, which is the side wall near the display window 23 of the front wall 22a. The insertion recess 33 is configured to have a concave shape that opens inwardly of the housing 22 by a cylindrical portion 33a that is integrally provided so as to protrude inward from the inner surface of the upper side wall portion 22b. The cylindrical portion 33a has a rectangular cylindrical shape that is substantially parallel to the front wall portion 22a. In the cylindrical portion 33a, the surface portion facing the front wall portion 22a is a locking portion 33p that is locked to the locked piece portion 34, as will be apparent from the description below.

  The locked piece portions 34, 34 are made of steel plate and have a rectangular shape, project outward from the upper end portion 25b of the display device 25, and obliquely so that the distal end side is separated from the inner surface of the front wall portion 22a. It is bent.

  As shown in FIG. 1 and FIG. 7, the bending dimension of the locked piece portion 34 (the dimension from the base end of the locked piece portion 34 to the tip of the locked piece portion 34 in the direction away from the front wall portion 22a). ) Is Tb [mm], the target compression thickness dimension (thickness dimension after compression) of the packing 27 is Tp [mm], and the engagement in the insertion recess 33 from the inner surface of the front wall portion 22a of the housing 22 is as follows. When the distance from the stop piece 34 to the locking portion 33p is Tk [mm], and the distance from the front surface 25a of the display device 25 to the base end of the locked piece 34 is Tm [mm], The bending dimension Tb [mm] of the locked piece portion is determined by the equation (1).

Tb = Tk−Tm−Tp (1)
Here, the housing 22 of the authentication device 21 is relatively small, and therefore the display device 25 and the packing 27 are also small. In particular, the free thickness A (see FIG. 7) of the packing 27 is as thin as a millimeter order (2 to 3 mm). For example, the free thickness A of the packing 27 is set to 2 [mm], and the target compression rate is set. When (Tp / A) is 70%, the target compression thickness dimension Tp is 1.4 [mm]. For example, when the Tk is 10 [mm] and the Tm is 7 [mm] The bending dimension Tb is 1.6 [mm]. That is, the bending dimension Tb of the locked piece portion 34 is determined in accordance with the target compression thickness dimension Tp of the packing 27. In FIG. 7, the dimension Tt [mm] indicates the allowance for the packing 27.

  Note that the length dimension Ts (see FIGS. 1 and 7) from the inner surface of the front wall portion 22a to the tip surface of the screw boss 29 is previously set from the front surface portion 25a of the display device 25 to the 34 pieces to be locked. The length dimension is set by adding the target compression thickness dimension Tp to the distance Tm [mm] to the end.

  Now, a procedure for attaching the display device 25 to the inner surface of the display window 23 of the housing 22 will be described. First, as shown in FIG. 8, the operator grasps the display device 25, grasps the display device 25 in the narrow housing 22, and inserts the locked piece 34 into the recess 33. When trying to insert, the display device 25 is held slightly obliquely. Incidentally, at this time, it is preferable to hold the display device 25 obliquely so that the lower portion of the front surface of the display device 25 does not hit the standing boss 29 of the lower portion of the inner surface of the display window 23.

  In this state, the locked piece portion 34 that is bent as described above in the display device 25 has its directing direction substantially coincident with the opening direction of the insertion recess 33, and the operator holds the display device 25. If it is directly moved in the direction of the insertion recess 33 (in the direction of the arrow Q), the locked piece 34 is naturally inserted into the insertion recess 33. Accordingly, the locked piece 34 can be easily inserted into the insertion recess 33. This insertion completion state is shown in FIG. As can be seen from FIG. 9, the rotation trajectory (indicated by the phantom line K) of the attached piece 30 of the display device 25 substantially coincides with the screw boss 29 by the completion of the insertion described above.

  Thereafter, when the lower end side of the display device 25 is turned to the inner surface side of the housing 22 from the state shown in FIG. 9 with the locked piece 34 as a rotation fulcrum, the attached piece 30 is screwed. It naturally comes into contact with the tip of the boss 29. At this time, the distal end portion of the bent piece 34 to be bent comes into contact with and is engaged with the engagement portion 33p of the insertion recess 33 by the rotation, and pushes the engagement portion 33p. As a result, the display device 25 is pressed toward the inner surface of the front wall portion 22a of the housing 22 as a reaction force, thereby compressing the packing 27. The compression thickness dimension Tp of the packing 27 at this time becomes a target value according to the bending dimension Tb of the locked piece 34 as described above. Thereafter, the screw 31 is screwed onto the screw boss 29, and the attachment of the display device 25 to the inner peripheral surface of the display window 23 is completed.

  Here, the housing 22 is made of plastic and is formed by molding, and the housing 22 after molding has a manufacturing dimension error due to shrinkage or shrinkage with respect to the design value (the initial value of the Tk). (Error with respect to design dimensions) may occur. Such manufacturing dimensional errors are often the same manufacturing error between individuals rather than being varied between individuals of the casing 22 because they are molded by the same mold. In such a case, the compression thickness dimension Tp of the packing 27 also deviates from the target value. In this respect, according to the present embodiment, as described above, the compression thickness dimension Tp of the packing 27 can be determined by the bending dimension Tb of the locked piece portion 34. If the manufacturing error is measured after the body 22 is molded, and the bending dimension Tb of the locked piece 34 is set according to the manufacturing error, the housing 22 to be manufactured thereafter is manufactured without recreating the molding die. On the other hand, the compression thickness dimension Tp of the packing 27 can be easily matched with the target value.

  In addition, regarding the length dimension Ts from the inner surface of the front wall portion 22a to the tip surface of the screw boss 29, the manufacturing dimension error is relatively small. That is, since the screw boss 29 is formed on the front wall portion 22a which is a mounting wall portion of the display device 25, the length from the inner surface of the front wall portion 22a to the tip end surface of the screw boss 29 is almost the manufacturing dimension. The error is not. On the other hand, the insertion recess 33 is formed in an upper side wall portion 22b that is substantially perpendicular to the front wall portion 22a that is the mounting wall portion of the display device 25, that is, at a corner of the casing that is different from the front wall portion 22a. Since it is formed, there is a situation that manufacturing dimensional errors are likely to occur due to differences in the molten plastic runoff and shrinkage. In this respect, the compression of the packing 27 is caused by the bending dimension Tb of the locked piece portion 34 described above. The present embodiment in which the thickness dimension can be adjusted and determined can cope with such a situation very effectively.

  As described above, according to the present embodiment, the locked piece portion 34 provided on the display device 25 is inserted and locked into the insertion recess 33 of the housing 22, and one end of the display device 25 is attached to the housing 22. Therefore, the number of parts used for attaching the entire display device 25 can be reduced. Moreover, the display device 25 can also be arranged close to the upper side wall portion 22b which is the end portion of the housing 22.

  Further, since the locked piece 34 protrudes outward from one end portion of the display device 25 and the front end side is bent obliquely so as to be separated from the inner surface of the front wall portion 22a of the housing 11, the operator can display When inserting the locked piece 34 into the insertion recess 33 while holding the device 25 in an oblique state, the orientation direction of the locked piece 34 substantially matches the opening direction of the insertion recess 33. If the operator moves the display device 25 in the direction of the insertion recess 33 as it is, the operator can naturally insert the locked piece portion 34 into the insertion recess 33. As a result, the operator can insert the locked piece portion 34. Workability becomes simple.

  Further, since the bending dimension Tb of the locked piece portion 34 is determined according to the compression thickness dimension Tp targeted by the packing 27, the locked piece portion 34 is inserted into the insertion recess 33 as described above. When locked, the packing 27 can be compressed by pushing the locking portion 33p of the insertion recess 33 with the bent tip portion of the locked piece portion 34. As a result, the locked piece portion 34 is compressed. The compression thickness of the packing 27 can be adjusted to the desired target value by the initial setting or subsequent adjustment of the bending dimension Tb, and the packing compression thickness adjustment on the housing side such as design adjustment and redesign of the mold Unlike the case of performing the adjustment, the adjustment becomes extremely simple.

  Thus, it is important that the above-mentioned locked piece portion 34 has a function of compressing the packing 27 by its bending, and even if it is a display device having a bent piece of the locked piece portion, If the bending of the stop piece does not contribute to packing compression, the effect of this embodiment cannot be obtained.

  In addition, according to the present embodiment, since the bending dimension Tb [mm] of the locked piece portion is determined by the above-described equation (1), the distance Tk in the housing 22 and the distance in the display device 25 are determined. If Tm is known, the bending dimension Tb of the locked piece portion can be calculated in accordance with the target compression thickness dimension Tp of the packing 27, and when the display device 25 is attached to the housing 22, the packing 27 is naturally. Can be compressed to the target compression thickness dimension Tp, and the desired water sealing effect can be obtained.

  In addition, according to the present embodiment, since the insertion recess 33 is constituted by the cylindrical portion 33 a formed in the upper side wall portion 22 b near the display window 23, the locked piece portion 34 is inserted into the insertion recess 33. When the other end portion side of the display device 25 is attached in a state, the locked piece portion 34 can be prevented from being detached from the insertion recess portion 33.

  In the above embodiment, the bending dimension Tb [mm] of the locked piece portion 34 is determined in accordance with the target compression thickness dimension Tp, but instead of the compression thickness dimension Tp, the target of the packing 27 It may be determined according to the reduction allowance Tt [mm] (see FIG. 7).

That is, the above Tt is Tp = A−Tt when the thickness dimension of the packing 27 in the free state is A [mm] as shown in FIG. -(A-Tt)
= Tk-Tm-A + Tt
Thus, the bending dimension Tb [mm] of the locked piece 34 may be determined according to the above-described Tt.

  The distance Tk from the inner surface of the front wall portion 22a of the housing 22 to the locking portion 33p is the thickness dimension A in the free state of the packing 27 and the locked portion from the front surface portion 25a of the display device 25. It is good also as a dimension which added distance Tm to the one part 34 base end.

According to this, when Tk = A + Tm is substituted into the above-described equation (1),
Tb = A−Tp, that is, the bending dimension Tb is a value obtained by subtracting the target compression thickness dimension Tp from the free thickness dimension A of the packing, that is, the packing reduction allowance Tt. As a result, the reduction allowance Tt of the packing 27 and the bending dimension Tb of the locked piece 34 correspond to each other at 1: 1, so that the compression thickness dimension Tp and the reduction allowance Tt of the packing 27 can be set and adjusted very easily. It becomes.

  Further, as shown in FIG. 10 shown as the second embodiment of the present invention, the insertion recess 33 may be composed of a hole 41 formed in the upper side wall 22b near the display window 23. However, as in the case of the cylindrical portion 33 a, when the other end portion side of the display device 25 is attached with the locked piece portion 34 inserted into the insertion recess 33, the locked piece portion 34 is It can prevent coming off from the insertion recess 33.

  Further, as shown in FIG. 11 shown as the third embodiment of the present invention, the insertion recess 33 is provided on the upper side wall 22b near the display window 23 so as to be substantially parallel to the inner surface of the front wall 22a. Alternatively, it may be constituted by the opposing space portion of the two rib portions 42, 42. According to this, the insertion recessed part 33 can be comprised easily.

  In the first embodiment, the attachment means 28 for attaching the other end of the display device 25 to the housing 22 includes screw bosses 29, 29, attached pieces 30, 30 and screws 31. In this attachment means 28, for example, the attachment piece 30 is sandwiched between the front wall portion 22 a of the housing 22 and a lid (not shown) provided in the housing 22. It is good also as a structure.

  In addition, since the one end part side of a display apparatus is attached to a packing press state by the attachment means provided with the to-be-latched piece part and the insertion recessed part, the attachment means to attach the other end part side of a display apparatus is the other end part of a display apparatus. Those skilled in the art can easily deduce that the structure may be attached to such an extent that the side is locked. In view of this point, the attachment means for attaching the other end side of the display device is not specifically shown in claim 1, but as a specific structure, as can be understood from the above-described embodiment, For example, a mounting piece provided on the other end of the display device, a mounting portion (for example, the screw boss 29 or an engaging protrusion) formed on the inner surface of one wall of the housing, and a mounting piece It may be configured to include a fixing means (for example, a screw or a pressing portion that presses and locks the attached piece portion that is formed on a lid provided in the housing) to be fixed or locked to the portion.

  Further, the present invention can be applied to a security device, a digital camera, or a mobile phone in addition to the authentication device.

  In the drawings, 21 is an authentication device (electrical device), 22 is a housing, 22a is a front wall (one wall), 22b is an upper wall (wall), 23 is a display window, 25 is a display, and 25a is Front portion, 25b is upper end portion (one end portion), 25c is lower end portion (other end portion), 26 is a display surface, 27 is packing, 28 and 32 are attachment means, 33 is an insertion recess, 33a is a cylindrical portion, and 33p is The locking part, 34 is a piece to be locked, 41 is a hole, and 42 is a rib.

Claims (5)

A plastic case with a rectangular box shape and a display window formed on one wall;
A display device having a display surface on one surface part;
A packing attached to the peripheral surface of the one surface portion of the display device or the inner surface of the peripheral portion of the display window of the housing;
One end side and the other end side of the display device are respectively formed on the inner surface of the casing so as to compressively deform the packing between the peripheral portion of the one surface portion of the display device and the inner peripheral surface of the display window. In the display device mounting structure of an electrical device provided with mounting means for mounting,
An attachment means for attaching one end of the display device to the housing,
An insertion recess formed inside the side wall portion in the vicinity of the display window of the one wall portion and forming a concave shape that opens to the inside of the housing;
A steel plate that protrudes outward from the one end portion of the display device and is bent obliquely so that the tip side is separated from the inner surface of the one wall portion, and the bending dimension is determined in accordance with the compression thickness dimension or reduction allowance of the packing It consists of a locked piece part made of,
One end of the display device is attached to the inner surface of the display window peripheral portion of the housing by inserting and locking the tip of the locked piece portion of the display device into the insertion recess of the housing. A display device mounting structure for electrical equipment, characterized in that The target compression thickness dimension of the packing is Tp [mm], the distance from the inner surface of one wall portion of the casing to the locking portion of the insertion recess with the locked piece portion is Tk [mm], and the display When the distance from one surface portion of the device to the base end of the locked piece portion is Tm [mm] and the bending dimension of the locked piece portion is Tb [mm], the engagement is expressed by the following equation (1). 2. The display device mounting structure for an electric device according to claim 1, wherein a bending dimension Tb [mm] of the stopper portion is determined.
Tb = Tk−Tm−Tp (1)   When the thickness dimension in the free state of the packing is A [mm], the distance Tk from the inner surface of the wall of the casing to the locking portion is the thickness dimension A in the free state of the packing, 3. The display device mounting structure for an electric device according to claim 2, wherein a dimension is obtained by adding a distance Tm from one surface portion of the display device to a base end of the locked piece portion.   The display device mounting structure for an electric device according to any one of claims 1 to 3, wherein the insertion recess comprises a cylindrical portion or a hole formed in a side wall near the display window.   The said insertion recessed part was comprised by the opposing space part of the two rib parts protrudingly provided by the side wall part near the said display window so that it might become substantially parallel to the said one wall part inner surface. A display device mounting structure for an electrical device according to any one of the above.

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