JP2004309335A - Display unit and its front cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display unit and its front cover enabling to reduce a number of seals and to improve working efficiency. <P>SOLUTION: In a front cover 20, it is made possible to reduce a number of parts and to mitigate attachment work, since the primary seal for an aperture 60 for sealing the circumferential edge of a display window 24, and the perimeter seal 31 for sealing the front cover 20 and a display 11 are really made in one form of an inner sealing object 22. Moreover, sealing performance is improved because the front surface of the display unit 11 is doubly covered with a cover body 21 and the inner seal object 22 made in one box-like form to be engaged with the inner side of the cover body 21. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a display device and a front cover thereof.
[0002]
[Prior art]
FIG. 7 shows a conventional display device 6. A front cover 2 having a housing shape is provided on the front surface of the display device 6, and a packing 5 as a sealing member is sandwiched between the front cover 2 and the front surface of the display device 6. Another packing (not shown) and other sealing members (not shown) are also sandwiched between the edge of the display window 3 formed in the front cover 2 and the light transmitting member 4 that closes the display window 3. Further, when a button operation window (not shown) is provided on the front cover 2, the button operation window is also separately sealed.
[Problems to be solved by the invention]
However, in the above-described conventional configuration, it was necessary to separately seal a plurality of locations, and thus the sealing work was troublesome.
[0003]
In addition, the prior art document concerning the invention of this application could not be found.
[0004]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a display device and a front cover thereof capable of reducing the number of seal components and improving work efficiency.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is to provide a housing having an open side, a cover body attached by pressing an opening thereof to a front surface of the display device, and a housing having an open side. The inside seal body fitted inside the cover body, the display window penetratingly formed in the cover body, the inside window penetratingly formed in the inside seal body corresponding to the display window, and the inside of the inside seal body. A light-transmitting member that is addressed to close the display window, and a fixing means that penetrates the inner seal body and fixes the cover body and the light-transmitting member, wherein the inner seal body has a display window of the cover body. The window seal portion, which is sandwiched and crushed between the peripheral portion and the light-transmitting member, and protrudes laterally from the edge of the opening of the inner seal body, and is sandwiched between the display device and the cover body. Where the outer peripheral seal that is crushed To have the feature.
[0006]
According to a second aspect of the present invention, in the front cover according to the first aspect, a projection for a display window fitted to the inside of the display window is formed so as to protrude from the translucent member, and a display seal is formed on the window seal portion. The present invention is characterized in that a cylindrical wall which is fitted between the inner peripheral surface of the window and the outer peripheral surface of the display window projection to close the gap is provided.
[0007]
According to a third aspect of the present invention, in the front cover according to the first or second aspect, the window seal portion is provided with a ridge standing upright from the peripheral portion of the inner window toward the cover main body. The present invention is characterized in that the groove accommodating the ridge is depressed.
[0008]
According to a fourth aspect of the present invention, in the front cover according to any one of the first to third aspects, a plurality of display windows are provided, and one display window constitutes an LED display window that is arranged to face an LED provided in the display device. The translucent member is characterized in that the LED receiving portion capable of receiving the LED tip portion is depressed.
[0009]
According to a fifth aspect of the present invention, in the front cover according to any one of the first to fourth aspects, a button operation hole is formed through the cover body and the light transmitting member so as to face a button provided on the display device, The inner seal body has a button pressing portion that is disposed to face the button operation hole and can be pressed against the button by a pressing operation, and surrounds the button pressing portion and is located between the peripheral portion of the button operation hole and the light transmitting member. It is characterized in that a button seal portion sandwiched and crushed is integrally formed.
[0010]
According to a sixth aspect of the present invention, in the front cover according to the fifth aspect, the button pressing portion protrudes to a side away from the light transmitting member and is fitted into the button operation hole, and is displayed from the inner surface of the button pressing portion. A feature is that a pressing shaft portion is formed so as to protrude toward the device, and the pressing shaft portion is inserted into the button operation hole of the light transmitting member to restrict the tilting of the pressing shaft portion.
[0011]
A display device according to a seventh aspect of the invention is characterized in that the front cover according to any one of the first to sixth aspects is fixed to the front surface.
[0012]
Function and effect of the present invention
<Invention of claim 1>
In the front cover according to the first aspect, the window seal portion for sealing the peripheral portion of the display window and the outer peripheral seal portion for sealing between the front cover and the display device are integrally formed on the inner seal body. Reduction and assembly work are achieved. In addition, since the inner seal body has a housing shape fitted inside the cover main body, the front surface of the display device is double-covered by the cover main body and the inner seal body, and the sealing performance is improved. .
[0013]
<Invention of Claim 2>
In the front cover according to the second aspect, the cylindrical wall provided in the window seal portion closes the gap between the fitting portions of the display window and the display window projection, and the sealing property of the display window can be improved.
[0014]
<Invention of Claim 3>
In the front cover according to the third aspect, the ridge provided on the window seal portion is housed in the groove formed in the cover body, so that the sealing property of the display window is further improved.
[0015]
<Invention of Claim 4>
In the front cover according to the fourth aspect, by receiving the tip of the LED in the LED receiving portion formed in the light transmitting member, it is possible to efficiently transmit the light of the LED to the light transmitting member.
[0016]
<Invention of claim 5>
In the front cover according to the fifth aspect, in addition to the window seal portion and the outer peripheral seal portion, the button seal portion for sealing the button operation hole of the cover body is formed integrally with the inner seal body, so that the number of parts is further reduced. Thus, the assembling work can be reduced.
[0017]
<Invention of claim 6>
In the front cover according to the sixth aspect, the pressing shaft protruding from the inner surface of the button pressing portion is guided by the button operation hole of the light transmitting member to regulate the tilting of the pressing shaft portion. It can be performed stably.
[0018]
<Invention of Claim 7>
According to the display device of the seventh aspect, since the front cover is fixed to the front surface, the number of components and the assembling work can be reduced as compared with the conventional display device.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
<First embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a display device 11 of the present invention. The display device 11 receives a signal from a measuring device (not shown) and displays a measurement result. An annular sealing surface 11W is formed on the front surface of the display device 11, and various devices such as a display 15, a button 16, and the like are mounted on a front instrument section 11K surrounded by the annular sealing surface 11W. . The display 15 is arranged substantially at the center of the front instrument section 11K. The buttons 16, 16 are arranged on both sides of the display 15. Further, an LED 17 is provided above the display 15 so as to protrude forward. Note that, in addition to the above, a circuit board, a seismic sensor, and the like are attached to the front instrument section 11K.
[0020]
On the front surface of the display device 11, a front cover 20 according to the present invention is attached so as to cover the front instrument section 11K. The front cover 20 is formed by assembling a cover main body 21, an inner seal body 22, and a light transmitting member 23 with each other.
[0021]
The cover body 21 has a flat housing shape, and one end surface in the flat direction is open. A horizontally long display window 24 is formed through a portion of the cover main body 21 facing the display 15 of the display device 11. On both left and right sides of the display window 24, circular button operation holes 25, 25 are formed so as to face the buttons 16, 16 of the display device 11, respectively. A circular LED display window 26 is formed above the display window 24 so as to face the LED 17. Further, four screw holes 45A are formed in the vicinity of each corner of the display window 24 (see FIG. 5; only a pair of screw holes 45A are shown in FIG. 5).
[0022]
The inner seal body 22 is made of, for example, an elastomer, has a flat housing shape with one end open slightly smaller than the cover body 21 and is fitted inside the cover body 21 as shown in FIG. Further, an outer peripheral seal portion 30 according to the present invention projects laterally from the edge of the open end of the inner seal body 22.
[0023]
As shown in FIG. 1, an inner window 31 is formed through the inner seal body 22 so as to correspond to the display window 24 of the cover body 21. A peripheral portion of the inner window 31 of the inner seal body 22 forms a first window seal portion 60, and the first window seal portion 60 has a first window seal portion 60 protruding forward from the opening edge of the inner window 31. Is provided.
[0024]
An LED inner window 39 is formed through the inner seal body 22 so as to correspond to the LED display window 26 of the cover body 21. The peripheral portion of the LED inner window 39 forms a second window seal portion 61, and the second window seal portion 61 has a second cylindrical wall projecting forward from the opening edge of the inner window 39. 38 are provided.
[0025]
Screw insertion holes 44S are formed in the inner seal body 22 so as to correspond to the plurality of screw holes 45A (see FIG. 5) of the cover main body 21. As shown in FIG. 5, a third cylindrical wall 46 (see FIG. 5) is formed to project rearward from the opening edge of each screw insertion hole 44S.
[0026]
As shown in FIG. 2, button pressing parts 33, 33 are formed on the left and right sides of the inner window 31 on the front surface of the inner seal body 22. Each button pressing portion 33 has a dome shape and protrudes from the front surface of the inner seal body 22, and is fitted into the button operation holes 25, 25 of the cover body 21. The peripheral portions of the button pressing portions 33 are button seal portions 63.
[0027]
Further, a pressing shaft portion 35 is formed so as to protrude rearward (toward the display device 11) from a center portion of the button pressing portion 33, and the tip of the pressing shaft portion 35 protrudes from the front surface of the display device 11. 16 is matched. Then, by pressing the button pressing portion 33, the pressing shaft 35 can press the button 16.
[0028]
The light transmitting member 23 is made of, for example, transparent plastic, and has a horizontally long thin plate shape as a whole as shown in FIG. At four corners of the light transmitting member 23, screw insertion holes 44 are formed. As shown in FIG. 5, the screws 45 inserted into the respective screw insertion holes 44 are also inserted into the screw insertion holes 44S of the inner seal body 22. Then, the light transmitting member 23 is fixed to the cover main body 21 with the inner seal body 22 sandwiched between the cover main body 21 and the screw hole 45 </ b> A of the cover main body 21. Then, as shown in FIG. 2, the first window seal portion 60 is sandwiched between the periphery of the display window 24 in the cover main body 21 and the light transmitting member 23 and is crushed, and the button operation hole 25 is formed. The button seal portion 63 is sandwiched between the peripheral portion of the LED and the light transmitting member 23, and is crushed. Further, as shown in FIG. 3, between the peripheral portion of the LED display window 26 and the light transmitting member 23. The second window seal portion 61 is pinched and crushed. Thus, the display window 24, the button operation hole 25, and the LED display window 26 are sealed.
[0029]
On the front surface of the translucent member 23, a display window projection 40 fitted to the inner window 31 and an LED projection window 41 fitted to the LED display window 26 are formed to project. Then, as shown in FIG. 3, the first cylindrical wall 32 provided in the first window seal portion 60 is sandwiched between the inner peripheral surface of the inner window 31 and the outer peripheral surface of the display window projection 40. At the same time, the second cylindrical wall 38 provided in the second window seal portion 61 is sandwiched between the inner peripheral surface of the button operation hole 25 and the outer peripheral surface of the LED projecting window portion 41. As a result, the sealing performance of the display window 24 and the LED display window 26 is enhanced. As shown in FIG. 5, a third cylindrical wall 46 of the inner seal body 22 is fitted in a gap between the screw 45 and the inner peripheral surface of the screw insertion hole 44 in the light transmitting member 23. Accordingly, even in the case where the screw hole 45A penetrates the cover main body 21, high sealing performance can be maintained.
[0030]
As shown in FIG. 2, button insertion holes 43, 43 are formed through the light transmitting member 23 at positions facing the buttons 16, and a pressing shaft extending from the button pressing portion 33 is formed here. The part 35 is inserted. This prevents the pressing shaft portion 35 from tilting during the pressing operation of the button pressing portion 33, so that the button 16 can be pressed reliably. Further, the opening width of the button insertion hole 43 is smaller than the width of the step portion 36 formed in a stepped shape at the base end of the pressing shaft portion 35, and when the button pressing portion 33 is pressed. The stepped portion 36 abuts on the periphery of the button insertion hole 43 of the light transmitting member 23, thereby preventing the button pressing portion 33 from being excessively pushed into the inside of the cover main body 21.
[0031]
An LED receiving portion 42 is formed in the translucent member 23 on the back side of the LED projecting window portion 41, and the LED receiving portion 42 accommodates a distal end portion of the LED 17 protruding from the front surface of the display device 11. (See FIG. 3). Thereby, the light of the LED 17 can be transmitted through the light transmitting member 23 efficiently.
[0032]
Next, the operation and effects of the above embodiment will be described.
The manner in which the components constituting the front cover 20 are assembled together is as follows. That is, the inner seal body 22 is fitted inside the cover main body 21. Then, the first cylindrical wall 32, the button pressing portions 33, 33, and the second cylindrical wall 38 formed integrally with the inner seal body 22 are respectively connected to the display window 24, the button operation hole formed in the cover body 21. 25, 25 and the LED display window 26. Further, an outer peripheral seal portion 30 integrally formed with the opening portion of the inner seal body 22 is laid on the opening edge of the cover body 21. Next, the translucent member 23 is addressed from the rear side of the inner seal body 22, and the inner seal body 22 is sandwiched between the translucent member 23 and the cover main body 21, and tightened with the screw 45. Thereby, the first and second window seal portions 60 and 61 of the inner seal body 22 are sandwiched between the cover main body 21 and the light transmitting member 23, and a plurality of portions are sealed at once.
[0033]
The front cover 20 assembled as described above is screwed to cover the front instrument section 11 </ b> K of the display device 11. As a result, the outer peripheral seal portion 30 protruding from the inner seal body 22 is sandwiched between the cover main body 21 and the display device 11, and the mounting portion between the display device 11 and the front cover 20 is sealed. As described above, drip-proofing and dust-proofing for the front instrument section 11K on the front surface of the display device 11 are achieved.
[0034]
As described above, according to the present embodiment, all of the seal portions required for the front cover 20 are formed integrally with the inner seal body 22, so that the number of parts and the assembling work can be reduced. Also, since the inner seal body 22 has a housing shape fitted inside the cover main body 21, the front surface of the display device 11 is double-covered by the cover main body 21 and the inner seal body 22, The sealing performance is improved.
Note that the housing in the present invention refers to a shape having a space inside, and does not necessarily have to be a rectangular parallelepiped. Therefore, the front cover may have a hemispherical shape.
[0035]
<Second embodiment>
This embodiment is shown in FIG. 6, and differs from the first embodiment in the structure of the first window seal portion 60. That is, in the present embodiment, the ridge 50 protrudes from the peripheral portion of the inner window 31 toward the cover main body 21 at the first window seal portion 60 ′ of the inner seal body 22. Specifically, the ridge 50 is arranged at a portion slightly outside the opening edge of the inner window 31 and is formed so as to surround the inner window 31. On the other hand, around the display window 24 on the back surface of the cover body 21, a groove 51 for accommodating the ridge 50 is formed to be depressed. The other structure is the same as that of the first embodiment, and the description thereof will not be repeated.
[0036]
According to the present embodiment, in addition to the function and effect similar to the first embodiment, the ridge 50 provided in the first window seal portion 60 ′ is housed in the groove 51 formed in the cover main body 21. In addition, the sealing property of the display window 24 is further improved.
[0037]
<Other embodiments>
The present invention is not limited to the above-described embodiments. For example, the following embodiments are also included in the technical scope of the present invention, and furthermore, various embodiments may be made without departing from the spirit of the present invention. It can be changed and implemented.
(1) In the first and second embodiments, only one of the cylindrical wall 32 and the protruding ridge 50 is formed on the peripheral portion of the inner window 31 of the inner seal body 22 so as to protrude. Both of the ridges 50 may be provided.
[0038]
(2) In the first and second embodiments, the pressing shaft portion 35 formed in the button pressing portion 33 is inserted through the button insertion hole 43 formed in the light transmitting member 23. May be inserted.
[0039]
(3) In the first and second embodiments, the display window 24 and the LED display window 26 are formed to penetrate the portion facing the display 15 and the LED 17, but may be formed in other portions.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a front cover according to a first embodiment of the present invention. FIG. 2 is a plan sectional view of the front cover. FIG. 3 is a partial side sectional view of the front cover. FIG. FIG. 5 is a side sectional view of a front cover. FIG. 6 is a plan sectional view of a front cover according to a second embodiment. FIG. 7 is an exploded perspective view of a conventional front cover.
11 display device 16 button 20 front cover 21 cover body 22 inner seal 23 translucent member 24 display window 25 button operation hole 26 LED display window 30 outer peripheral seal 31 inner window 32, 38 ... cylindrical wall 33 ... button pressing portion 35 ... pressing shaft portion 39 ... inner window 40 ... display window projection 41 ... LED projection window 42 ... LED receiving portion 43 ... button insertion hole 50 ... projection 51 ... grooves 60, 60 ', 61 ... window seals 63 ... button seals

Claims (7)

A cover body having an open casing on one side, the opening of which is pressed against the front of the display device, and
An inner seal body fitted on the inside of the cover main body, forming an open casing on one side;
A display window formed through the cover body;
An inner window formed through the inner seal body corresponding to the display window;
A light-transmitting member that is addressed to the inside of the inner seal body and closes the display window;
A fixing unit that penetrates the inner seal body and fixes the cover body and the light transmitting member;
The inner seal body includes a window seal portion squeezed between the periphery of the display window and the translucent member of the cover body, and an edge of an opening of the inner seal body. A front cover that is formed integrally with an outer peripheral seal portion that protrudes laterally from and is crushed by being sandwiched between the display device and the cover main body. A projection for a display window fitted inside the display window is formed in the translucent member,
2. The window seal portion includes a cylindrical wall that is fitted between an inner peripheral surface of the display window and an outer peripheral surface of the display window protrusion to close a gap. Front cover as described in. The window seal portion is provided with a ridge standing upright from the peripheral portion of the inner window toward the cover main body, and the cover main body is formed with a recess accommodating the ridge. The front cover according to claim 1 or 2, wherein With a plurality of the display windows, one display window constitutes an LED display window disposed to face the LED provided in the display device,
4. The front cover according to claim 1, wherein an LED receiving portion capable of receiving a tip portion of the LED is formed in the translucent member. A button operation hole is formed in the cover body and the light transmitting member so as to face a button provided in the display device,
The inner seal body includes a button pressing portion that is disposed to face the button operation hole and can be pressed against the button by a pressing operation, a peripheral portion of the button operation hole that surrounds the button pressing portion, and The front cover according to any one of claims 1 to 4, wherein a button seal portion sandwiched between the light-transmitting member and crushed is integrally formed. The button pressing portion is bulged to a side away from the light transmitting member and is fitted into the button operation hole, and a pressing shaft portion is formed to project from the inner surface of the button pressing portion toward the display device,
The front cover according to claim 5, wherein the pressing shaft portion is inserted into the button operation hole of the light transmitting member to restrict the tilting of the pressing shaft portion. A display device comprising the front cover according to any one of claims 1 to 6 fixed to a front surface.

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