JPS5852696Y2 - Printed board - Google Patents

Description

[Detailed description of the invention] The present invention relates to a printed circuit board, and prints the surface of the insulating substrate, excluding the symbols and figures of circuit elements, in a color different from that of the insulating substrate. It is an object of the present invention to provide a printed circuit board that can particularly increase lighting effects without being affected by color.

FIG. 1 is a plan view of an example of a conventional printed circuit board, and FIG. 2 is a longitudinal sectional view taken along line I--■ in FIG.

In each figure, 1 is a plate-shaped insulating base material, on the back side of which a conductor 2 is printed in a predetermined pattern, and furthermore, this conductor 2
A resist film 3 is coated on the conductor 2 excluding the soldered portion and on the back surface of the insulating base material 1 for rust prevention, corrosion resistance, leak prevention, etc.

On the other hand, a circuit element or the like is placed on the surface of the insulating base material 1, and in order to solder the terminal of the circuit element or the like to the conductor pattern on the back surface, a terminal insertion hole 4□,
4□, 5. ．． 5□, 6□～6. ．． 7. ~7.4 is drilled.

Further, 8 is a hole for inserting an illumination lamp.

Further, on the surface of the insulating base material 1, symbols and figures (so-called parts marks) indicating circuit elements and the like to be mounted are printed.

In the example in Figure 1, 9 is a crystal resonator, 10 is a diode,
11 to 13 are resistors, and 14 is an IC symbol mark, indicating that these are printed.

The color of these parts marks 9 to 14 is selected to be a color 1 different from the ground color (for example, ocher) of the insulating base material 1, and is usually white.

However, light from a lamp inserted into the hole 8 of the conventional printed circuit board so that its head is exposed above the surface of the printed circuit board is irradiated to the outside through a drum made of, for example, a transparent resin. When used in a display device that reads inverted digits using transmitted light from the above-mentioned lamps (for example, a digital car clock), there is a current trend toward brighter lighting, so it is difficult to compare the reflectance. For the printed circuit board mentioned above, which has a low background color and occupies most of the color of the surface of the insulating base material 1, it was not possible to make the illumination sufficiently bright if the illumination color was dark.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to FIGS. 3 and 4.

FIG. 3 is a plan view of an embodiment of the printed circuit board according to the present invention, and FIG. 4 is a longitudinal sectional view taken along the line III--III in FIG.

In each figure, the same parts in FIGS. 1 and 2 are designated by the same reference numerals, and their explanations will be omitted.

In FIGS. 3 and 4, reference numeral 15 indicates a printed layer printed on the surface of the insulating base material 1.

This printing layer 15 is provided on the surface of the insulating base material 1 in areas other than parts marks.
As shown in FIG. 2, the surface of the insulating base material 1 is exposed.

Here, the printing layer 15 is selected to have the highest reflectance for all wavelengths (usually white), and this color occupies most of the color of the surface of the printed circuit board.

Further, since the color of this printing layer 15 is different from the ground color of the insulating base material 1, the parts marks 16 to 21 are displayed depending on the ground color of the exposed surface of the insulating base material 1, respectively.

The part marks 16 to 21 occupy a very small area on the surface of the printed circuit board, and therefore, most of the surface area of the printed circuit board is occupied by the color of the printed layer 15. In practice, the cost required for this is almost the same as that of the conventional method.

When the printed circuit board of this embodiment having such a configuration is incorporated into the display device described above, most of the surface of the printed circuit board is printed with a printed layer 15 of a color having a high reflectance for all wavelengths. Even if the same lamp as before is used, the illumination of the display section can be made brighter than before.

As mentioned above, the printed circuit board according to the present invention has a surface part of the insulating base material other than the part mark to be displayed that has a color different from the base color of the other side of the insulating base material, and has a higher reflection than the base color. The parts mark is printed and coated with a color of a certain color, and the parts mark is displayed in the ground color of the surface of the insulating base material, so that the light emitted from the lamp on the printed circuit board on the side where the part mark is displayed illuminates the display area. When used in a display device that performs display using the transmitted light, the printing layer that occupies most of the surface of the printed circuit board can greatly reflect the light emitted from the lamp. It has the advantage of being brighter when using a lamp with the same brightness compared to a conventional display, and it is also possible to use an inexpensive lamp with a lower wattage when the same brightness as before is sufficient. It is something that you have.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an example of a conventional printed circuit board, Fig. 2 is a vertical sectional view taken along the line I-I in Fig. 1, and Fig. 3 is an embodiment of the printed circuit board according to the present invention. The plan view and FIG. 4 are longitudinal sectional views taken along line III--III in FIG. 3. 1...Plate-shaped insulating base material, 2...Conductor, 3...Resist mist film, 4□, 4□, 5□, 5
2,6□~66.7□~7□4...hole, 8...
...Lighting lamp insertion hole, 9-14.16-21
... Parts mark, 15 ... Printing layer.

Claims (1)

[Scope of utility model registration request] A conductor pattern is printed on one side of a plate-shaped insulating base material, and a parts mark such as a symbol 9 figure indicating a circuit element etc. to be mounted is displayed on the other side of the insulating base material. In a printed circuit board made of A printed circuit board which is printed and coated with a layer of a reflective color, and is configured such that the parts mark is displayed in the ground color of the other side of the insulating base material.