JP3346476B2 - Display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device mounted on an instrument for a vehicle, for example, and more particularly to a display device using a liquid crystal panel as a display element.

[0002]

2. Description of the Related Art As a display device using a liquid crystal panel, there is, for example, Japanese Patent Application Laid-Open No. 10-288772. In order to assemble a liquid crystal panel on a printed wiring board, FIG.
As shown in FIG. 2, the locking piece e of the liquid crystal suppressor d is inserted into the mounting hole f provided in the printed circuit board a, and the tip is fixed by twisting, or as shown in FIG. In addition, a locking claw 2b provided at the tip of the liquid crystal holder 2 is inserted into a locking hole 1a and locked to the lower surface of the printed circuit board 1 to be fixed. Of these, the one that stops the liquid crystal suppressor d is twisted and requires a work of assembling because it involves twisting work. In view of this point, the locking claw 2b provided at the tip of the liquid crystal holder 2 is attached to the printed circuit board 1. It is advantageous to lock and fix to the lower surface.

[0003]

However, the structure in which the locking claw 2b provided on the liquid crystal holder 2 is locked and stopped on the lower surface of the printed circuit board 1 is certainly advantageous in terms of assemblability. The locking claws 2b locked to the printed circuit board 1 may come off due to a difference in the coefficient of thermal expansion of each component accompanying the above, or a vibration applied to the display device.
Anxiety remained with regard to the certainty of the fixation.

The present invention has been made in view of the above points, and provides a display device having high attachment reliability by preventing a locking portion provided on a holder for holding a display element from coming off a printed wiring board. The purpose is to do.

[0005]

In order to solve the above-mentioned problems, the present invention provides a display element, a holder for holding the display element, a first printed wiring board provided behind the holder, and A second printed wiring board provided behind the first printed wiring board, wherein the holder includes the second printed wiring board.
And a deflectable locking piece protruding toward the printed wiring board side of the first printed wiring board .
A locking portion for locking on the back surface is provided, and the front end side of the locking piece is regulated on the second printed wiring board so that the locking portion is positioned forward.
A regulating means for preventing the first printed wiring board from coming off from the back surface is provided.

Further, the restricting means comprises a through hole provided in the second printed wiring board, and a tip end of the locking piece is inserted into the through hole.

Further, the display device includes a display element, a holder for holding the display element, a printed wiring board provided behind the holder, and a member provided behind the printed wiring board. Is flexible to project to the member side
A locking piece provided with a locking portion for locking the back surface of the printed wiring board in this locking piece is provided, the locking portion is the located restrict the distal end side of the locking piece to the member Pudding
And a regulating means for preventing the wiring board from coming off the rear surface .

[0008] Further, the regulating means comprises an insertion portion provided on the member, and the distal end side of the locking piece is inserted into the insertion portion.

The restricting means comprises a projecting piece provided on the member, and the projecting piece is provided with the locking portion.
This is brought into contact with or close to one side of the locking surface opposite to the side of the locking.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described based on each embodiment. 1 to 3 show a first embodiment of the present invention, FIG. 1 is a partial cross-sectional view showing an instrument device incorporating a display device,
FIG. 2 is an exploded perspective view of the display device, and FIG. 3 is a sectional view of the display device. Note that the holding body in the present embodiment includes a panel case and a panel holder.

In FIG. 1, an instrument main body 2 for a speedometer is arranged on the back side of a first printed wiring board 1, and a pointer 4 which rotates on a pointer shaft 3 of the instrument main body 2 according to a predetermined measurement amount.
And a display plate 5 provided behind the hands 4 and having an indicator (not shown) to be indicated by the hands 4 is housed in an instrument case 6 made of synthetic resin. A second printed wiring board 7 on which electronic components for driving the meter body 2 are mounted is disposed on the back side of the meter body 2, and is electrically connected to the meter body 2. The second printed wiring board 7 and the first printed wiring board 1 are electrically connected using a connector (not shown).

The first printed wiring board 1 includes a light source 8 for illuminating the hands 4 and a light source 8A for illuminating the display panel 5, and a pilot display section and a warning display section (not shown) formed on the display panel 5. A light source 8B to be illuminated is mounted, and the instrument case 6 is provided with a partition wall 9 for separating the light sources 8, 8A and 8B. Also, the first printed wiring board 1
, A display device D is fixedly mounted. This display device D
Forms a window 10 at a predetermined position of the display panel 5 and this window 1
It is arranged to face 0. In this way, by dividing the printed wiring board into upper and lower parts and arranging the meter main body 2 on the back side of the first printed wiring board 1, the pilot display unit and the warning display unit can be arranged around the hands 4. Therefore, the pilot display section and the warning display section are easy to see, and the alerting effect is also increased. A black dial plate 11 is provided on the front opening side of the instrument case 6, and the front of the dial plate 11 is covered with a transparent plate 12 made of a transparent resin. A cover 13 is provided on the back side of the instrument case 6.
It is covered with.

The display device D includes a liquid crystal panel (display element) 1
4, a panel case 15 as a holding body for holding the liquid crystal panel 14 from behind, and a liquid crystal panel between the panel case 15 and the liquid crystal panel 14 in contact with a peripheral edge of the liquid crystal panel 14 to prevent the liquid crystal panel 14 from slipping forward. A panel holder 16 as a holding body formed to hold the first and second printed wiring boards 1 and 2 is disposed between the liquid crystal panel 14 and the first printed wiring board 1. And a diffusion plate 18 disposed on the back side of the liquid crystal panel 14, and these are connected to the first connector.
On the printed wiring board 1. Further, the first printed wiring board 1 is provided with a light source 8C for illuminating the liquid crystal panel 14 from behind. The light source 8C illuminates the entire liquid crystal panel 14 more uniformly with the diffusion plate 18 interposed. Reference numeral 7 denotes a second printed wiring board which is electrically connected to the first printed wiring board 1 as described above. The liquid crystal panel 14 displays the traveling distance of the vehicle, the outside temperature, and the like.

The panel case 15 is formed of a synthetic resin in the shape of a frame, and has a frame shape that continuously covers the upper end surface 19 on which the diffusion plate 18 and the liquid crystal panel 14 are mounted and the outer peripheral edge of the liquid crystal panel 14. The rising wall 20 is provided. Reference numeral 21 denotes a notch, in which a convex portion 22 provided on the diffusion plate 18 is provided.
And the diffusion plate 18 is positioned. Further, the partition wall 9A is provided to form a groove space 23, and the rubber connector 17 is inserted into the groove space 23. Further, groove portions 24 are provided on opposite side walls of the panel case 15. Reference numeral 25 denotes a positioning pin.
5 enters a positioning hole 26 provided in the first printed wiring board 1, and the panel case 15 is positioned on the first printed wiring board 1.

The panel retainer 16 is formed by pressing a metal plate, and has a frame-like edge 27 that continuously covers the outer periphery of the liquid crystal panel 14.
And has a side wall portion 28 extending in a frame shape along the side wall. The side wall 28 corresponding to the groove 24 of the panel case 15 is formed.
A plurality of locking pieces 29 protruding downward (the second printed wiring board 7) from the location are provided, and in the middle of the locking pieces 29,
A protrusion 30 serving as a locking portion for locking to the first printed wiring board 1 is provided in a state protruding inward of the panel holder 16. The protruding portion 30 has an inverted triangular shape, and its cross section is formed so as to be inclined so that the upper side (the edge 27 side) protrudes inward as shown in FIG.

The second printed wiring board 7 has a through hole 31 at a position corresponding to the locking piece 29 provided on the panel holder 16. Then, when the display device D is assembled, the distal end side of the locking piece 29 is inserted into the through hole 31.

The instrument device according to the present embodiment is assembled as follows. The panel case 15 is positioned and mounted on the first printed wiring board 1, the rubber connector 17 is disposed in the groove space 23, and the diffusion plate 18 and the liquid crystal panel 14 are mounted on the upper end surface 19 of the panel case 15. In this state,
A panel holder 16 is mounted from the front side of the liquid crystal panel 14. At this time, the protrusion 30 moves toward the first printed wiring board 1 along the groove 24 provided in the panel case 15 and the locking piece 29 flexes outward. And the projection 3
At the point in time when 0 comes off the end face 32 of the first printed wiring board 1, the locking piece 29 returns to the original position, and the upper end 33 of the protruding portion 30 is locked on the back surface of the first printed wiring board 1. .

Next, the first printed wiring board 1 and the second printed wiring board 7 to which the instrument main body 2 is mounted and fixed are assembled. By this assembling, the tip side of the locking piece 29 is inserted into the through hole 31 of the second printed wiring board 7. After that, the assembled product in which the second printed wiring board 7 is assembled to the first printed wiring board 1 is set on the cover 13, and the instrument case 6 and the display board 5 are set on the first printed wiring board 1. The pointer 4 is fixed to the pointer shaft 3 of the instrument body 2. Then, a return plate 11 is attached to the open end of the instrument case 6.
Is set, and the see-through plate 12 is assembled.

As described above, the locking piece 29 is provided on the panel holder 16 which is a holding body for holding the liquid crystal panel 14, and the locking piece 29 is provided with the protruding portion 30 which is locked on the first printed wiring board 1.
The protrusion 30 is detached from the first printed wiring board 1 by inserting the tip end of the locking piece 29 into the through hole 31 provided in the second printed wiring board 7. Even if such a function is performed, the tip end side of the locking piece 29 hits the wall surface 34 of the through hole 31 and the protrusion 30 can be prevented from coming off, whereby the mounting reliability can be improved. Further, since the protrusion 30 is locked and fixed to the first printed wiring board 1 only by mounting the panel holder 16 provided with the locking piece 29, the assembling workability is also good. Further, even in the case of the second printed wiring board 7 having a large number of electronic components and circuits, it is sufficient to provide only a hole into which the locking piece 29 can be inserted. No need to use.

FIG. 4 shows a second embodiment of the present invention, in which the number of printed wiring boards is one. The printed wiring board 1A is the first printed wiring board 1 according to the first embodiment.
, But larger than the periphery of the panel case 15. Therefore, a locking hole 35 is provided in the printed wiring board 1A corresponding to the locking piece 29. Behind the printed wiring board 1A, a cover 13 as a member is disposed, and at a position corresponding to the locking piece 29 provided on the panel holder 16,
A concave portion 36 is provided as an insertion portion. The distal end of the locking piece 29 is inserted into the recess 36.

The display device according to the present embodiment is assembled in the same manner as in the first embodiment. Panel Holder 1
6, the protrusion 30 enters the locking hole 35 of the printed wiring board 1A from the tip end side of the locking piece 29, and the protrusion 30
When the end surface 32 of the printed wiring board 1A is released, the locking piece 29 returns to the original position, and the upper end 33 of the protruding portion 30 is locked to the back surface of the printed wiring board 1A. After that, by attaching the cover 13, the tip side of the locking piece 29 is inserted into the concave portion 36 of the cover 13.

With this configuration, the same effects as in the first embodiment can be obtained. That is, even if the function of the protrusion 30 coming off the printed wiring board 1A works, the position of the tip end of the locking piece 29 is restricted in the concave portion 36 of the cover 13, so that the protrusion 30 can be prevented from coming off. Thus, the mounting reliability can be improved. Also, the assembling workability is good. Although the insertion portion is the concave portion 36, a through hole may be provided in the cover 13 and the distal end side of the locking piece 29 may be inserted into the through hole as in the first embodiment.

FIG. 5 shows a third embodiment of the present invention. The cover 13 is different from the second embodiment. A piece 37 is provided integrally with the cover 13 so as to protrude from the cover 13 so as to be close to the surface of the locking piece 29 facing the projection 30 provided on the locking piece 29 (the surface opposite to the projection 30). With this configuration, it is possible to obtain the same effects as the above embodiments.

In each of the embodiments, the panel holder 16
Is made of metal, but may be made of resin. Further, if the liquid crystal panel 14 can be held in the panel case 15 without the panel holder 16, the panel holder 16 may not be provided. In this case, a locking piece may be provided on the panel case 15 so as to be locked to the first printed wiring board 1 or the printed wiring board 1A. When the display device is incorporated in the instrument device, the panel case 15 may be integrated with the instrument case 6. In addition, of the plurality of locking pieces 29, there may be a part of the instrument case 6 where the protrusion 30 is prevented from coming off.

[0025]

According to the first aspect of the present invention, it is possible to prevent the locking portion locked to the first printed wiring board from being disengaged by the regulating means provided on the second printed wiring board, and to improve the mounting reliability. A high display device can be provided.

According to a second aspect of the present invention, the second printed wiring board is provided with a through hole, and the detachment of the locking portion is prevented by a simple method of inserting the tip end of the locking piece into the through hole. Can be prevented.

According to a third aspect of the present invention, a display device having high reliability of attachment can be prevented by a restricting means provided on a member disposed behind the printed wiring board, so that a locking portion locked on the printed wiring board can be prevented from coming off. An apparatus can be provided.

According to the fourth aspect of the present invention, it is possible to prevent the locking portion from coming off by a simple method in which an insertion portion is provided in the member and the distal end side of the locking piece is inserted into the insertion portion.

According to the fifth aspect of the present invention, detachment of the locking portion can be prevented by a simple method of providing a projecting piece on the member.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of an instrument device according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the display device showing the embodiment.

FIG. 3 is a sectional view of the display device showing the embodiment.

FIG. 4 is a sectional view of a display device according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a display device showing a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st printed wiring board 7 2nd printed wiring board 13 Cover (member) 14 Liquid crystal panel (display element) 15 Panel case (holding body) 16 Panel holder (holding body) 29 Locking piece 30 Projection (locking) Part) 31 through hole 36 concave part (insertion part) 37 projecting piece

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) G09F 9/00 G01D 11/26-11/28 B60K 35/00

Claims (5)

(57) [Claims] 1. A display element, a holder for holding the display element, a first printed wiring board provided behind the holder, and a second printed wiring board provided behind the first printed wiring board. A printed wiring board, wherein the holding body is provided with a deflectable locking piece protruding toward the second printed wiring board, and the locking piece is locked to a back surface of the first printed wiring board. The second printed wiring board is provided with a distal end side that is restricted in position.
From the back of the first printed wiring board
A display device provided with a restricting means for performing the operation. 2. The display according to claim 1, wherein said regulating means comprises a through hole provided in said second printed wiring board, and a tip end side of said locking piece is inserted into said through hole. apparatus. 3. A display device comprising: a display element; a holder for holding the display element; a printed wiring board provided behind the holder; and a member provided behind the printed wiring board. Is provided with a deflectable locking piece protruding toward the member, a locking portion locking the back surface of the printed wiring board is provided on the locking piece, and the distal end side of the locking piece is positioned on the member. Regulates the locking portion so that the printed
A display device provided with a regulating means for preventing the wire plate from coming off the back surface . 4. The display device according to claim 3, wherein said regulating means comprises an insertion portion provided on said member, and a tip end side of said locking piece is inserted into said insertion portion. 5. The regulating means comprises a projecting piece provided on the member, and the projecting piece is provided on a surface provided with the locking portion.
The display device according to claim 3, wherein the display device is in contact with or close to a locking one surface on the opposite side of the display device.