JPS5937813Y2 - display device - Google Patents

Description

[Detailed description of the invention] This invention relates to display devices such as digital timers and digital testers that use a flat digital display tube.
In particular, it relates to a structure that allows a flat filter to be tightly fixed to a display window drilled in a front panel plate with a simple operation without distorting the filter, and that prevents parts inside the main body from being unnecessarily visible from the outside through the filter. It is something.

In a conventional display device in which a display window formed in a front panel plate is closed from the inside with a filter 53 (see FIG. 4), the filter 53 is directly attached to the frame of the display window 52 with adhesive or Tightening was fixed by screws 54.

However, with the former method of adhesive bonding, once the installation is fixed, not only is it impossible to replace the defective product due to damage, etc.
There is a disadvantage that the adhesive protrudes from the frame part during adhesion, making it difficult to assemble, and the latter method of fixing with the screws 54 is difficult to work with and is expensive, and since the filter 53 is plate-shaped and long, the screws 54 are difficult to assemble. If the tightening strength is not properly controlled, a gap will be created and the filter 53 will become loose, and if it is over-tightened, the filter 53 will be deformed near the tightening position of the screw 54, as shown in Figure 4, and the display tube ( In addition, light rays from the casing (not shown) are locally distorted and refracted, making the displayed characters unclear, and due to dimensional errors in the display window, other parts inside the case can be seen from the outside through the filter.

In order to solve the above-mentioned drawbacks, this invention provides a pair of opposing standing walls protruding from the upper and lower parts of the front panel board, a display window is bored on the upper side between these standing walls, and the lower periphery of the window is The lower end of the flat filter is secured to the recessed step provided in the cross section.
With the notch on one side of the letter-shaped mounting bracket in contact with the longitudinal end surface of the upper end of the filter, install and position the mounting bracket on the upper vertical wall, and then insert the tongue piece from the middle side of the mounting bracket. vertically to position the rear surface of the filter, and then fix the printed circuit board to the other side of the mounting bracket and the lower standing wall parallel to the front panel board to cover the rear surface of the filter. The letter-shaped mounting bracket allows for easy positioning of the flat filter without distorting it, and this same mounting bracket can also be used as a member to fix the printed circuit board parallel to the panel board, and also to fix the printed circuit board in parallel. By doing so, the rear side of the filter is covered and the internal structural components of the device are prevented from being unnecessarily transmitted through.

An example in which this invention is implemented in a digital timer will be explained below with reference to the drawings.

In Fig. 1, this digital timer consists of an L-shaped upper case 1, a front panel plate 2 that covers the front surface of this case, and an L-shaped lower case 3 that simultaneously covers the rear and bottom surfaces of this digital timer. There is.

As shown in FIG. 1, the front panel 2 is formed into a plate shape by pultrusion molding an aluminum material, and has a pair of opposing vertical walls 4□, 42 integrally protruding from the upper and lower ends.

An elongated display window 5 is bored at the upper side between the vertical walls 41 and 4□, and a recessed step portion for locking the lower end 6a of the filter 6 is provided at the lower peripheral edge of the display window 5. 7 is formed.

8 is a printed circuit board, and on the side facing the panel board 2 is a flat display tube 9. Electrical components such as an IC (not shown) switch 10 are soldered.

In FIGS. 2 and 3, reference numeral 11 denotes a mounting bracket with an opening-shaped cross section, and a notch 12 on the negative side 11a is formed by abutting against and positioning the elongated end surface 6b of the upper end of the filter 6. A tongue piece 13 is bent downward and hung on the intermediate side 11b, and a screw hole 14 for fixing the upper part of the printed circuit board 8 with a screw is provided on the other side 11C.

When attaching the filter 6 to the front panel plate 2, the lower end 6a of the filter 6 is engaged with the recessed step 7 provided on the lower periphery of the display window 5, and the longitudinal end surface 6b of the upper end of the filter 6 is fixed. Attach the filter 6 to the display window 5 with one side 11a of the mounting bracket 11 in contact with the
a standing wall 4 with a mounting bracket 11 protruding from the top of the front panel board 2;
Fix it with screw 15.

At this time, the filter 6 is positioned in the front-rear direction by being held between the front panel plate 2 and the tongue piece 13 hanging down from the intermediate side 11b of the mounting bracket 11, and the lateral positioning is performed by holding it between the front panel plate 2 and the tongue piece 13 hanging from the middle side 11b of the mounting bracket 11. Notch 12 provided in
This is done by inserting it into the

Next, the printed circuit board 8 is fixed at a position facing the front panel board 2 by screwing its upper and lower parts to the other side 11c of the mounting bracket 11 and the standing wall 42 protruding from the lower part of the panel board 2.

By fixing the printed circuit board 8 in a position facing the panel board 2, it is possible to prevent the electrical components in the rear of the case from being seen from the outside through the filter 6.

16 is a power transformer fixed to the lower case 3, 17 is an outlet insertion port for an external electric device, and 18 is a rubber foot for supporting the main body.

According to this invention having the tank bottom as described above, the peripheral edge of the flat filter 6 is fitted with a mounting bracket 11 having a cross-sectional opening shape and a display window 5.
The structure is such that the filter 6 is fixed to the display window 5 by positioning it in the front, back, left, right, top and bottom using the recessed step 7 provided on the lower periphery, so the filter 6 can be attached directly to the display window 5 by screwing it in place as in the past. It will not be deformed and the displayed characters from the display tube will not be clear, and if the filter 6 is damaged or cloudy, it can be replaced using the metal fitting 11.
This can be done by simply removing the .

Furthermore, when the front panel plate 2 is integrally pultruded, it has been difficult to position the filter 6 in the longitudinal direction, but according to this invention, the printed circuit board 8 can be mounted using the metal fittings 11.
Since the filter 6 can be positioned in the longitudinal direction with the notch 12, there is no need to perform post-processing on the front panel plate 2, which is optimal.

Furthermore, according to this invention, the printed circuit board 8 is fixed parallel to the front panel board 2 and covers the rear side of the filter 6, so that other electrical components in the rear of the case cannot be seen through the filter 6 from the outside. It can be prevented.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of a digital timer that is an embodiment of the present invention, Figures 2 and 3 are partially exploded perspective views of the structure of the filter installation according to the present invention, and Figure 2 is a view of the filter from the back side. Fig. 3 shows the filter as seen from the front side, and Fig. 4 shows a conventional example. 2...Front panel board, 4. , 42...
・Vertical wall, 5...Display window, 6...Filter, 7...Concave step, 11...Mounting bracket, 11a... -Side side, 11b...
Middle side, llc...Other side, 12...
Notch part, 13...tongue piece.

Claims (1)

[Scope of utility model registration request] A pair of opposing standing walls 40, 4 at the top and bottom of the front panel board 2
A display window 5 is installed on the upper side between these standing walls 4□ and 4□.
The lower end side 6a of the flat filter 6 is locked to the concave stepped portion 7 provided at the lower peripheral edge of the window 5, and the cutout portion of the one side 11a of the cross-sectional mouth-shaped mounting bracket 11 is cut out. 12 is brought into contact with the upper longitudinal end surface 6b of the filter 6, this mounting bracket is mounted and positioned on the upper vertical wall 4□, and the tongue piece 13 is suspended from the intermediate side 11b of the mounting bracket 11. to position the rear surface of the filter 6, and further fix the printed circuit board 8 to the other side 11c of the mounting bracket 11 and the lower standing wall 42 in parallel with the front panel board 2 to cover the rear surface side of the filter 6. A display device characterized by: