JP3180860B2 - Electronic device housing with display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing for an electronic device having a display used for a control system or the like, and more particularly to a structure for fixing a built-in printed circuit board.

[0002]

2. Description of the Related Art In a control system of industrial control equipment, various inspections and confirmations are facilitated by enhancing display functions.
With an increase in the density of electronic elements, an occupied area for display cannot always be sufficiently ensured. Therefore, as disclosed in Japanese Utility Model Laid-Open No. 1-179425 proposed by the present applicant, there is known an apparatus including a main printed circuit board and a grandchild printed circuit board on which a display element is mounted. In the case where the number of display elements used for displaying a power failure is small, the display element is mounted on a printed circuit board and light is guided to the display surface as disclosed in Japanese Utility Model Application Laid-Open No. Hei 3-1579. I have.

[0003]

However, when a grandchild printed circuit board is used, it is necessary to provide a cover for holding the grandchild printed circuit board in a housing. When the shape is complicated, there is a problem that trouble occurs during molding. Also,
Those that guide the light of the issuing element using a light guide,
There has been a problem that the number of parts increases and the assembling work becomes complicated. The present invention has solved the above-mentioned problems,
It is an object of the present invention to provide an electronic device housing having a display device with a small number of components and a simple component shape.

[0004]

According to the present invention for achieving the above object, there is provided a printed circuit board, a display board connected to the printed circuit board via a cable, and having a light emitting element mounted thereon. An electronic device having a case having a side surface larger than the printed circuit board, a case 30 for accommodating the display substrate on the back of a display window 31 provided on the front, and a cover 40 attached to the back of the case. The device housing includes a holding hole provided in the display substrate, and a holding protrusion protruding in the rear direction of the display window and engaging with the holding hole. It is characterized in that it is held between the projection and the end of the printed circuit board.

[0005]

The printed circuit board is accommodated in the side of the case. The display substrate is accommodated on the back of the display window of the case, and is L- or T-shaped in relation to the printed circuit board. Therefore, the display substrate is held between the holding projections and the end of the printed circuit board to facilitate assembly.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG.
FIG. 1 is a configuration diagram showing an embodiment of the present invention, in which a case is indicated by a broken line. In the figure, a printed circuit board 10 on which electronic elements and connectors are mounted has a substantially L-shape. The display substrate 20 has light-emitting elements such as LEDs arranged in a matrix, and has a T-shape in relation to the printed circuit board 10. In the case 30, the printed circuit board 10 is accommodated in the side direction, and the display substrate 20 is accommodated in the back of the display window 31 provided on the front. The cover 40 is mounted on the back surface of the case 30 and holds the printed board 10 and the display board 20 integrally. The case 30 is attached to an electronic device housing such as a nest (not shown). The display window 31 may be provided with a display window cover 50 made of a transparent plastic or the like.

FIG. 2 is an enlarged view of the vicinity of the display window 31. On the back surface of the display window 31, there are provided a holding projection 37 for positioning the display substrate 20, and a display substrate contact portion 39 with which the surface of the display substrate 20 on the display window 31 side contacts. The display substrate contact portion 39 is a linear protrusion provided in the width direction of the display window 31.

FIG. 3 is an exploded view of parts, with the cover 40 removed. The display window 31 is formed with a matrix of 4 rows and 8 columns corresponding to each light emitting element. If necessary, an LED for displaying a power failure state or a nameplate for displaying a display target may be attached. The display substrate housing chamber 32 is located at the back of the display window 31 and houses the display substrate 20. The printed board housing chamber 33 occupies most of the case 30 and houses the printed board 10. The cover locking hole 34 is engaged with the case mounting claw 41 already erased from the cover 40. Here, two rectangular windows are provided on one side surface. Cover guide projection 35
Is for facilitating the fitting of the case 30 and the cover 40, and a thin portion thinner than the original thickness is formed at a corresponding position on the cover 40 side. The case guide projection 42 may be provided on the cover 40 side, and a thin portion may be formed on the case 30 side. The nest mounting part 36 is
Screw holes provided at the upper end and the lower end of the surface abutting the cover 40 are used when the case 30 is attached to a nest or a wall.

A connector 11 is provided on the back side of the printed circuit board 10, and is used for connection to a bus on the nest side. A connector 12 is provided on the front side, and is used for connection with a signal line connected to an external device.
The cable 22 is a multi-core flat cable that connects the printed board 10 and the display board 20 to each other.
Is sent. The holding hole 21 is connected to the display substrate 20.
The opening provided at two places engages with the holding projection 37. The hole shape is elliptical in consideration of the dimensional error.

FIGS. 4A and 4B are parts views of the case 30, in which FIG. 4A is a front view, FIG. 4B is a side view, and FIG. The connector mounting hole 37 is for receiving a cable for connection with the connector 12 mounted on the printed circuit board 10.
Screw holes are formed at both ends for complete connection. The board holding groove 38 is formed by cutting out a part of a rib formed in the width direction of the case 30 and positions the printed board 10. The holding protrusion 37 is provided at a position that does not overlap with the substrate holding groove 38. In addition, about the cover 40,
A connector mounting hole 37 is provided for mounting a cable connected to the connector 11 mounted on the printed circuit board 10.

Next, the operation of assembling the thus constructed apparatus will be described. First, the display substrate 20 is mounted on the back surface of the display window 31 so that the holding protrusion 37 of the case 30 and the holding hole 21 are engaged. Next, the printed board 10 is inserted into the printed board storage chamber 33 by being inserted along the board holding groove 38. Here, the difference in attitude between the display board 20 and the printed board 10 is absorbed by the cable 22. Finally, when the cover 40 is mounted on the case 30, the display board 20 and the printed board 10 are fixed collectively.

As described above, according to the present invention, when the cover 40 is finally mounted on the case 30, the display substrate 20 and the printed circuit board 10 are fixed together, so that the case As compared with the case where the display substrate 20 and the printed circuit board 10 are sequentially fixed, there is an effect that the assembling operation can be performed smoothly. In addition, the processing and space of the case, which are required for the conventional sequential fixing, are reduced, which contributes to an increase in the density of electronic devices.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is an enlarged view of the vicinity of a display window 31.

FIG. 3 is an exploded view of parts excluding a cover 40.

FIG. 4 is a component diagram of a case 30.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Printed circuit board 20 Display board 21 Holding hole 30 Case 37 Holding projection 40 Cover

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G09F 9/00-9/46

Claims (1)

(57) [Claims] 1. A printed circuit board (10), a display board (20) connected to the printed circuit board via a cable (22) and having a light-emitting element mounted thereon, and a side surface shape of which is smaller than that of the printed circuit board. An electronic device housing having a case (30) in which the display substrate is accommodated behind a large display window (31) provided in the front and a cover (40) attached to the back of the case. A holding hole (21) provided in the display substrate; and a holding protrusion (37) projecting rearward of the display window and engaging with the holding hole. An electronic device housing having a display device which is held at an end of a printed circuit board.