JPH0723378U - 7 segment LED - Google Patents

Abstract

(57) [Abstract] [Purpose] A 7-segment LED of the type that is surface-mounted on a printed circuit board, and an object thereof is to provide a structure that can be easily assembled to the printed circuit board. [Configuration] A predetermined position on the printed circuit board 2 A chip LED 3 which is surface-mounted on the printed circuit board, a housing 5 which is mounted on the printed circuit board 2 so as to cover the chip LED 3, and a light guide hole 4 at each position corresponding to the chip LED 3, and a housing 5 which is attached to the surface of the housing 5. The diffusion sheet 6 is attached to diffuse the light of the chip LED 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a 7-segment LED of the type that is surface-mounted on a printed circuit board.

[0002]

[Prior art]

 As shown in FIGS. 7 to 9, a 7-segment LED used to display an Arabic numeral on a display panel portion of an electronic device is provided with a 7-segment LED 11 in a housing 10 of a case main body in advance, as shown in FIGS. There is known a 7-segment LED unit 13 in which a leg 12 protruding from a side wall of a main body is bent flat to be surface-mounted on a printed circuit board.

When the LED unit 13 is surface-mounted on a printed circuit board, if the LED unit 13 is transported to a reflow solder layer together with the printed circuit board and heated by hot air, the insulating housing of the LED unit 13 may be melted. Therefore, it is surface-mounted by hand soldering separately from the reflow soldering process.

[0004]

[Problems to be solved by the device]

 In this way, even though it is a surface-mounted component, it cannot be put into the reflow solder layer, and it takes time and labor, resulting in poor production efficiency and defective soldering due to manual soldering, which inevitably leads to deterioration in quality. There was a problem. Further, the 7-segment LED unit has a high component height, and there is a problem in that the degree of freedom in design is small when it is used in an operation panel or the like and has a small thickness.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a 7-segment LED that can be easily assembled on a printed circuit board.

[0006]

Means for Solving the Problems The object of the present invention to solve the above problems and achieve the above objects is to provide a chip LED surface-mounted at a predetermined position on a printed circuit board, and to cover the chip LED with the print LED. It is composed of a housing mounted on a substrate and having light guide holes at respective positions corresponding to the chip LEDs, and a diffusion sheet attached to the surface of the housing to diffuse the light of the chip LEDs. It is that.

[0007]

[Action]

 In the 7-segment LED according to the present invention, a chip LED is mounted on the surface of a printed circuit board, the light of the chip LED is guided to the surface of an operation panel or the like through a light guide hole of a housing, and the light is evenly diffused by a diffusion sheet. To be seen. Therefore, unlike the case of mounting the conventional 7-segment LED on the printed circuit board, the work by manual soldering is eliminated, and it can be placed on the printed circuit board together with other electronic components and flowed to the reflow solder layer. The height of the housing can be set freely, making it easy to reduce the overall thickness of the product.

[0008]

【Example】

 Next, an embodiment according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view of an operation panel using a 7-segment LED according to a first embodiment of the present invention. 2 is a perspective view of a 7-segment LED shown in the same exploded view, and FIGS. 3 to 4 are sectional views taken along the line AA or the line BB in FIG.

The first embodiment according to the present invention is, as shown in FIG. 2, a chip LED 3 which is surface-mounted at a predetermined position so that a number can be displayed in 7 segments on a printed circuit board 2, and the chip LED 3 The chip 5 is mounted on the printed circuit board 2 while being covered with the chip 5, and has a housing 5 having light guide holes 4 open at both ends at respective positions corresponding to the chip LED 3, and the chip 5 attached to the surface of the housing 5 described above. The diffusion sheet 6 diffuses the light of the LED 3.

The chip LED 3 is surface-mounted when mounted together with other electronic components on the printed board 2.

The housing 5 is a plastic product, and is integrally formed with the operation panel 1 or is a separate article. Then, as shown in FIG. 3, light guide holes 4 opened at both ends in the upper and lower directions are formed corresponding to the chip LEDs 3, respectively.

The lower opening of the light guide hole 4 is provided close to the upper portion of the chip LED 3 so as not to disperse light to the other, while the upper opening is formed as shown in FIGS. 2 to 4. , 7 segments are formed slightly larger than the shape of each segment.

The housing 5 is provided with a fixing boss 7 and is fixed to the printed circuit board 2 by a tapping screw 8.

The diffusion sheet 6 is a thin flat sheet that has been treated with a satin finish, and the surface thereof is solidly coated with black ink or the like and attached to the upper surface of the housing 5. A semi-transparent window 9 is provided by removing the solid according to the shape of each segment. The semi-transparent window 9 and the light guide hole 4 of the housing 5 are aligned with each other for the attachment. .

According to such a 7-segment LED structure, after the chip LED 3 is surface-mounted on the printed circuit board 2, the chip LED 3 is covered so that the lower openings of the light guide holes 4 are positioned, and The housing 5 is fixed on the printed circuit board 2 with tapping screws 8 at a predetermined position, and then the diffusion sheet 6 is attached so as to cover the upper openings of the light guide holes 4 of the housing 5. .

Then, the Arabic numeral is visually recognized by turning on the chip LED 3 at a predetermined position so as to obtain a desired display.

The second embodiment of the present invention, as shown in FIGS. 5 to 6, is different from the first embodiment of the 7-segment LED structure described above in that the upper opening of the light guide hole 4a of the housing 5a. Is formed in accordance with a predetermined 7-segment LED, the diffusion sheet 6a is a windowless sheet, and is configured to uniformly diffuse the light of the chip LED 3, and the others are formed in the same manner.

Also in this second embodiment, the chip LEDs 3 are surface-mounted on the printed circuit board 2 at predetermined positions, and the chip LEDs 3 are covered so that the lower openings of the light guide holes 4a are located corresponding to the respective chip LEDs 3. The housing 5 is fixed on the printed circuit board 2 with the tapping screw 8, and then the diffusion sheet 6a is attached to the surface of the housing 5 so as to cover the upper opening of the light guide hole 4a.

Then, when the chip LED 3 is turned on at a predetermined position, a desired Arabic numeral is visually recognized.

In the first and second embodiments described above, it is also preferable that the housing 5 and the diffusion sheets 6 and 6a are attached in advance.

Further, as shown in FIG. 3 to FIG. 4 or FIG. 6, the light guide holes 4 and 4a of the housing 5 are provided with a taper on the side wall so that the light sources are uniformly focused so that they cannot be seen at one point. Is diffused, which is preferable.

Further, since the chip LED 3 is used to cover the housing 5, the overall height can be made lower than that when the conventional 7-segment LED is used, which increases the degree of freedom in design. . Also, as a third embodiment, although not shown, the diffusion sheets 6 and 6a are not used, but the housing 5 is made of two different synthetic resin materials, for example, black and semi-transparent It is also possible to form the housing main body with the black material and to form the light guide hole 4 with the other translucent material.

[0023]

[Effect of device]

 As described above, the 7-segment LED according to the present invention is a chip LED that is surface-mounted at a predetermined position on a printed circuit board, and is mounted on the printed circuit board while covering the chip LED and corresponding to the chip LED. Since it consists of a housing with light guide holes at each position and a diffusion sheet that is attached to the surface of the housing and diffuses the light of the chip LED, it is possible to flow the chip LED along with other electronic components to the reflow solder layer. In the present invention, the separate process using the conventional manual soldering is eliminated, and the production efficiency is improved, which is an excellent effect.

Further, there is an excellent effect that the height of the housing can be arbitrarily set, the degree of freedom in design is increased, and the product can be made thinner easily.

[Brief description of drawings]

FIG. 1 is a 7-segment LED according to a first embodiment of the present invention.
It is a top view of the operation panel using.

FIG. 2 is a perspective view of a 7-segment LED shown exploded.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB in FIG.

FIG. 5 is an exploded perspective view of a 7-segment LED according to a second embodiment.

6 is a sectional view taken along the line CC of FIG.

FIG. 7 is a plan view of a 7-segment LED unit according to a conventional example.

FIG. 8 is a side view of FIG.

9 is a front view of FIG.

[Explanation of symbols]

 1 operation panel, 2 printed board, 3 chip LED, 4, 4a light guide hole, 5, 5a housing, 6 diffusion sheet, 7 boss, 9 window.

Claims (1)

[Scope of utility model registration request] 1. A chip LED, which is surface-mounted at a predetermined position on a printed circuit board, a housing which is mounted on the printed circuit board so as to cover the chip LED, and has a light guide hole at each position corresponding to the chip LED. And a diffusion sheet that is attached to the surface of the housing and diffuses the light of the chip LED.
D.