JPH08250833A - Printed wiring board with display parts and display parts - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a printed wiring board and a display component capable of realizing the display of a manufacturing lot at a low cost. [Structure] An automatically mountable component 1 having a display 2 for manufacturing was mounted on a printed wiring board 3. [Effect] Since the manufacturing indication is given on the component, it has excellent heat resistance, and since this component can be mounted by the automatic mounting device, the number of mounting steps can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed wiring board on which a component for displaying manufacturing information is mounted on a printed wiring board and a component for displaying manufacturing information.

[0002]

2. Description of the Related Art A conventional printed wiring board manufacturing lot display, for example, has been shown in FIG. In FIG. 3, a number (manufacturing indication) 102 representing a manufacturing lot is printed on a printed wiring board 101, and a label 103 having an adhesive applied to the back surface is attached. The indication of the manufacturing lot or the like is displayed on the printed wiring board before the component 104 is soldered. It was manually attached to the position designated by the display such as NO.

[0003]

However, the conventional display of manufacturing lots and the like has the following drawbacks. 1. When a heat-sensitive label was passed through a reflow oven or a molten solder bath in the soldering process, the label was discolored, deformed, or had dirt attached due to heat. 2. Since the designated position is judged manually and the sticking is performed carefully so that there is no displacement, it takes man-hours and cost is high. 3. It required a separate process to attach the label before mounting the parts.

Therefore, an object of the present invention is to provide a printed wiring board and a display component, on which display components such as the above-mentioned manufacturing lot are improved and display components are eliminated to eliminate these drawbacks.

[0005]

In order to solve such a problem, a printed wiring board on which a display component according to the invention of claim 1 is mounted has a display component on which a manufacturing indication has been made attached on the printed wiring board. With the structure.

According to a second aspect of the present invention, there is provided a printed wiring board on which the display component is mounted, wherein the manufacturing reference display is provided on the printed wiring board, and the display component is soldered in the vicinity of the manufacturing reference display. With the structure.

According to the third aspect of the invention, the structure of the display component is such that the component mounted by the automatic component mounting device is provided with manufacturing indication.

[0008]

According to the first aspect of the present invention, since the parts having heat resistance are used, there is no fear of impairing the display. Since the parts are provided with the manufacturing indication, the parts can be automatically mounted.
The number of manufacturing steps can be reduced. In the invention of claim 2,
Since the manufacturing reference display is provided in the vicinity of the display component, the mounting position of the manufacturing display component can be easily known. According to the third aspect of the present invention, as the display component, the same standard product as the normal component that can be mounted by the automatic mounting device can be used, and the cost of the component can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure and operation of a printed wiring board on which a display component of the present invention is mounted and a display component will be described below with reference to FIGS.

FIG. 1 is a perspective view of a printed wiring board on which a display component according to the present invention is mounted, and FIG. 2 is a plan view of the printed wiring board for carrying out the present invention. In FIG. 1, a display component 1 is in the shape of a rectangular chip, and has EIAJ (Electronic Machinery Manufacturers Association of Japan) standard RCX- with electrodes at both ends.
2123, a resistor or a capacitor may be used as long as it is a mass-produced type such as 2012 type, 1608 type. As information related to manufacturing on the body part of this display component, for example, a manufacturing date is specifically indicated by a three-digit number, with the upper one digit representing the last one digit of the year, and the lower two digits. The month

In this way, 120 kinds of manufacturing dates can be displayed and manufacturing lots can be displayed. That is, FIG.
The meaning of 502 in the manufacturing indication 2 above means that it is a lot manufactured in February 1995. The printing of this display may be done with a heat resistant paint of the type normally applied to parts.

In FIG. 2, lands 4a and 4b formed of a pair of independent conductors are provided on the printed wiring board 3 at positions where the display component 1 is to be mounted, and lands 6a for other normal components are provided.
6b is provided at the same time. Then, a manufacturing reference display 5 (for example, LOT.NO) for indicating the meaning of the display of the display component 1 is provided at a position adjacent to this mounting position. The printing for this display does not require a special process if it is performed at the same time as the silk-printing process for printing the reference numbers of the normal parts of the printed wiring board 3. Each land 4a, 4b, 6a, 6b on the printed wiring board 3 thus prepared
Then, the cream solder 7 is applied to the above, and then the display component 1 is loaded into an automatic component mounting device (not shown) in the form of taping, a cartridge or the like suitable for automatic supply like other normal components,
By the sequence program control, the display component 1 and the normal component 8 are automatically mounted at predetermined positions.

Next, the printed wiring board 3 on which components are mounted
Is placed in an infrared heating furnace (reflow furnace), the applied cream solder 7 is melted, and the components are fixed. This soldered display component 1 does not function as an electrical component, but the displayed three-digit number indicates the manufacturing lot of the board and plays an important role in product quality control. Fulfill

In the above-mentioned embodiment, the display chip has a rectangular chip shape, but it may have a cylindrical shape or a leaded part.

[0015]

As is clear from the above description, the printed wiring board on which the display component according to the present invention is mounted has excellent heat resistance as compared with the conventional manufacturing display by sticking a label, and other conventional products. Since the automatic mounting device can be used at the same time as mounting the parts, the number of steps can be reduced. Further, the provision of the land for mounting the printed wiring board and the manufacturing reference display for carrying out the present invention can be simultaneously performed in the steps normally required for manufacturing the printed wiring board, so that there is no increase in cost at all. According to the display component of the present invention, the JIS
Since it is possible to use existing products that conform to the standard, it is advantageous in terms of cost, and since the area occupied on the board can be smaller than that for sticking labels, it can contribute to the improvement of the component mounting density on the board. .

[Brief description of drawings]

FIG. 1 is a perspective view of a printed wiring board on which a display component of the present invention is mounted.

FIG. 2 is a plan view of a printed wiring board for carrying out the present invention.

FIG. 3 is a plan view of a conventional printed wiring board having a label attached thereto.

[Explanation of symbols]

 1 Display Parts 2 Manufacturing Marking 3 Printed Wiring Board 4a, 4b Land 5 Manufacturing Reference Marking 6a, 6b Land 7 Solder 8 Normal Component 101 Printed Wiring Board 102 Manufacturing Marking 103 Label 104 Component

Claims (3)

[Claims] 1. A printed wiring board on which a display component having a manufacturing indication is attached on a printed wiring board. 2. A printed wiring board having a display component according to claim 1, wherein a manufacturing reference display is provided on the printed wiring board, and a display component is soldered in the vicinity of the manufacturing reference display. 3. A display component, which is produced by displaying manufacturing information on a component mounted by an automatic component mounting apparatus.