JP3532794B2 - Display unit - 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 unit for displaying a predetermined display to the outside in various units in a programmable controller.

[0002]

2. Description of the Related Art FIG. 8 is an overall view showing a display structure of a display device in a conventional programmable controller. In the figure, 2A is a printed circuit board A, 2B is a printed circuit board B, 4B is an LED chip, 21A is a connector pin, 21
B is a connector.

FIG. 9 is a detailed sectional view showing the connection relationship between the printed circuit boards A and B. In the figure,
The printed board B (2B) is fixed to the printed board A (2A) by soldering via the connector pins 21A of the connector 21B, and the LED chip 4B is mounted on the front surface of the printed board B (2B). In the energized state, the LED chip 4B emits light, and the interval S1 is maintained so as not to interfere with the light emitted from the adjacent LED chip 4B.

On the front surface of the case 3A for accommodating the unit composed of the printed boards A and B, a predetermined symbol indicating the purpose of the LED chip 4B is displayed on the case 3A with a space S2.

Further, as shown in FIG. 10, the printed boards A and B are enclosed by the front part and the rear part of the case 3A to form a display of a programmable controller.

[0006]

In the display structure of the conventional display unit, the light emitted from the LED chip 4B is
An interval S1 that does not interfere with the adjacent LED chips 4B
Since it is necessary to keep the above, it is not possible to mount the LED chips 4B at a high density, a large area for the LED chips 4B is required, and it is difficult to miniaturize the display unit itself. Further, although the LED chip 4B is housed in the case 3A, a slit is provided for radiating heat due to the heat generated by the components mounted on the printed circuit board A, so that a problem of electrical reliability is likely to occur due to mixing of foreign matters. Also,
Since there is a distance S2 from the LED chip 4B to a predetermined symbol indicating the application and the connector 14 is fixed on one side between the printed circuit board A and the printed circuit board B, it is difficult to obtain dimensional accuracy. There was also the problem of being difficult. Further, since the display unit is configured by the combination of the printed circuit board A, the printed circuit board B, and the connector, the number of parts is large and the cost is high.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a display structure of a display device which can be mounted at a high density and at a low cost.

[0008]

A display unit according to the present invention comprises a lens formed by arranging a plurality of light guide members for guiding light from an LED chip provided on a printed circuit board.
A partition plate provided in a gap between the respective incident surfaces of the plurality of light guide members to prevent light leakage from the LED chip; and a mask for fixing the lens by fitting the objective surface of the lens. A display name plate provided on the mask for confirming the use of the extracted characters by the light guided from the lens, a cover for covering the lens fixed by the mask, the LED chip and the incident surface with respect to the printed circuit board. And a mounting member that is mounted so as to be close to each other.

Further, the ribs provided on the lens dispose the light guide portions of the lenses stacked in a plurality of stages so as to form a predetermined gap, and slide the ribs in the grooves provided on the inner wall surface of the cover. Is to be attached.

[0010]

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Embodiment 1. FIG. 1 is a perspective view of component development of the display unit 1 according to the present invention. 2 is an overall view of the display unit 1 according to the present invention.
2A is a plan view, FIG. 2B is a front view, and FIG. 2C is a left side view. In the figure, 1 is a display unit which is fixed by fitting into a fixing hole provided in the printed circuit board 2 and which displays the LED output on the printed circuit board, and 2 is an L
A printed circuit board on which the ED chip 4 is mounted, 3 is a printed circuit board 2, a case for accommodating the display unit 1, 4 is an LED
It's a chip.

The display unit 1 is an LE on a printed circuit board.
The lens 11 that irradiates the light emitted from D by the incident surface and reflects it inside and irradiates it from the objective surface, the mask 12 that fixes the objective surface of the lens 11, and a predetermined character is extracted at a position corresponding to the objective surface of the lens 11. , A display name plate 13 for displaying predetermined characters, a partition plate 14 composed of an elastic member for partitioning the gap between the incident surfaces of the lens 11 and blocking light from the LED chip 4, and fixed by a mask 12. The cover 15 includes the lens 11.

The lens 11 has an objective projection 111 on which an objective surface is formed and which fits with the mask 12, an incident projection 112 on which an entrance surface is formed and which fits with the partition plate 14, and both ends in order to obtain dimensional accuracy between the lenses. Ribs 113, 114 formed on the
Are formed. Here, the lens 11 is formed of a transparent acrylic resin so that substantially L-shaped members corresponding to the LED chips 4 are arranged in a row by the ribs 113 (in this embodiment, eight light guide members). At the same time, by stacking the lenses 11 in a plurality of stages, for example, a light emitting surface of 4 rows and 8 columns is formed. And rib 11
3 is in contact with other lenses, and is formed so that the respective gaps on the incident surface and the objective surface are uniform. Then, the partition plate 14 is fitted into each gap on the incident surface so that the light of the LED chip 4 corresponding to the light source does not leak to the other. Also, FIG.
As shown in (a), the objective projections 111 are fitted into the lattice-shaped fitting holes provided in the mask 12, and the ribs 113 of the lens 11 are brought into contact with each other, so that the above-mentioned gaps are made uniform and a plurality of lenses are formed. Becomes one.

The mask 12 is engaged with an engagement hole 152 provided in the cover 15 so as to be inserted into an engagement projection 121 for fixing the mask 12 in which the lens 11 is fitted and a fixing hole of a printed circuit board. A fixing rib 122 for fixing the display unit 1 is formed. Then, the display name plate 13 is attached so that predetermined characters are displayed at a position corresponding to the object surface of the mask 12. An example of the display name plate 13 is shown in FIG. 4, which is a shaded portion that does not transmit light and a blank character that transmits light. Then, as shown in FIG. 3B, the size of the blank character is set within the objective plane of the lens 11, that is, within the dotted line of the mask 12, and the size of the blank character that allows light to pass within the frame of the lens 11. Check the usage with the displayed characters.

The construction of the partition plate 14, the lens 11 and the LED chip 4 is shown in FIG. 5, FIG. 5 (a) is a detailed view of FIG. 2 (a) in the present invention, and FIG. 5
It is an AA cross section of (a). As shown in the figure, LE
The gap S, which is the dimension between the D chips 4, is made as small as possible, and a partition plate 14 having a shape shown by diagonal lines is provided between the printed circuit board 2 and the lens 11 without a gap against the intrusion of light from the LED chips 4. Arrange.

A groove 151 is cut on the inner wall surface of the cover 15, and the lens 11 and the mask 12 are assembled together.
The rib 114 of the lens 11 slides over the groove 151 and is fitted therein. Then, the engaging protrusion 121 of the mask 12 engages with the fixing hole 152 of the cover 15,
Fixed. The display name plate 13 is attached to the mask 12, and the partition plate 14 is also fitted so as to close the gap between the incident projections to form the display unit 1.

FIG. 6 shows a display unit 1 according to the present invention.
3 is a perspective view showing a configuration of a printed circuit board 2. FIG. As shown in the figure, the display unit 1 is provided with a fixing rib 153 which is previously integrated with the cover 15,
The display unit 1 has a structure in which the fixing ribs 122 and 153 are fitted and fixed in the fixing holes 21 of the printed circuit board 2. Further, as shown in FIG. 7, the display unit 1 and the printed circuit board 2 are enclosed by the front part and the rear part of the case 3 to form a display of a programmable controller.

According to the present embodiment, the partition plate 14 is arranged so that the light emitted from the LED chip 4 does not enter the adjacent lens 11, so that the partition plate 14 is provided.
Even if the LED chip 4 is arranged only in the gap required for
Since the light of the D chip 4 does not leak to other parts, space can be saved, the mounting pitch between the LED chips 4 can be minimized, and the LED chips 4 can be mounted on the printed circuit board 2 with high density. . In addition, by providing a display name plate that allows the extracted characters to be confirmed in the frame of the lens 11 by the light guided from the lens 11, it is not necessary to display a symbol outside the frame of the lens 11 to save space. Therefore, it is possible to achieve high-density display. Further, in order to obtain the dimensional accuracy of the LED chip 4 and the lens 11 mounted on the printed circuit board 2, the lens 11, the mask 12, the display name plate 13, the partition plate 14, and the lens cover 15 are assembled and integrated to form the printed circuit board 2 Since it can be fixed to the one-touch attachment, the problem that dimensional accuracy is difficult due to misalignment and the like is solved, and space saving is achieved by miniaturization, and there is an effect that it is possible to cope with inexpensive and high-density mounting.

[0020]

As described above, according to the present invention, the LED
Light emitted from the chip can be mounted in a small size without leaking to the adjacent lens, and space can be saved. Further, the mounting pitch between the LED chips can be minimized, and the LED chips can be mounted on the printed circuit board with high density. In addition, by providing a display name plate of characters that can be checked inside the frame of the lens by the light guided from the lens, it is not necessary to separately display the symbol outside the frame of the lens, and the display interval can be narrowed. And
Space saving is achieved and high density display is possible.

Further, the ribs make it possible to shift the position of the lens and make the gap uniform, thereby making it possible to reduce the size further and improve the workability by the sliding type assembly.

[0022]

[0023]

[Brief description of drawings]

FIG. 1 is a perspective view of component development of a display unit according to the present invention.

2 is an overall view of the display unit 1. FIG.

FIG. 3 is a relationship diagram showing a relationship between a lens, a mask, and a display name plate.

FIG. 4 is an explanatory diagram showing a configuration of a display name plate.

FIG. 5 is a relationship diagram showing a relationship between an LED chip, a lens, and a partition plate.

FIG. 6 is an explanatory diagram illustrating how the display unit is attached to the printed circuit board.

FIG. 7 is a configuration diagram showing an overall configuration of a display of a programmable controller.

FIG. 8 is an overall view of a conventional display unit.

FIG. 9 is a detailed cross section of a conventional display unit.

FIG. 10 is a configuration diagram showing an overall configuration of a display of a conventional programmable controller.

[Explanation of symbols]

1 display unit, 2 printed circuit boards, 3 cases, 4
LED chips, 11 lenses, 12 masks, 13 display name plates, 14 partition plates, 15 covers.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-7-106229 (JP, A) JP-A-11-24608 (JP, A) JP-A-10-170734 (JP, A) JP-A-9- 211438 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) G09F 13/20 G02B 6/00 G02B 6/42 G05B 19/048 G09F 9/00 315

Claims (2)

(57) [Claims] 1. A lens formed by arranging a plurality of light guide members for guiding light from an LED chip provided on a printed circuit board, and a gap between incident surfaces of the plurality of light guide members.
A partition plate provided to prevent light from leaking from the LED chip, a mask for fixing the lens by fitting the objective surface of the lens, and the mask provided on the mask.
Display that allows you to check the usage of the blank characters with the light guided from
Display unit having a name plate, a cover which covers the lens which is fixed by the mask, and a mounting member for mounting so as to close the above LED chip and the incident surface for the said printed circuit board, the. 2. A cover provided by arranging light guide portions of a plurality of stacked lenses with a predetermined gap by a rib provided on the lens and sliding the rib in a groove provided on an inner wall surface of the cover. The display unit according to claim 1, wherein the display unit is attached.