JP2003060328A - Method for forming and processing display in printed board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the forming/processing method of display in a printed board for maintaining security, by disabling the reading of display after manufacture without troubles in the manufacture process of the printed board by displaying information on components loaded on the printed board on the printed board. SOLUTION: Fine projecting and recessing parts are arranged on the surface of resist (c) applied to the printed board, and the display of a character and the like is formed. A coating (d) is given to the projecting and recessing parts (b), after the components are loaded. Thus, the surface is smoothed by burying the projecting and recessing parts, and the reading of display is disabled.

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a method of forming and processing a display such as a character printed on the surface of a printed circuit board. 2. Description of the Related Art In order to facilitate mounting or testing of components on a printed circuit board, it is necessary to print information such as components mounted on the printed circuit board on the surface of the printed circuit board using a general paint. Are known. For example, Japanese Patent Application Laid-Open No. 5-75222 discloses that information such as a lot number, a product number, and a bar code is displayed on a printed circuit board to control production. In some cases, information such as parts is not printed on a printed circuit board at all for security. However, in the case of a printed circuit board in which information such as parts is printed on the surface of the printed circuit board and displayed, the manufacturing process is efficiently performed by displaying the information. In some cases, the information on the mounted components that make up the electronic device is clarified, which is not preferable due to the necessity of maintaining confidentiality. [0005] Further, if information on parts and the like is not described due to the necessity of maintaining confidentiality, work in a manufacturing process or the like may be difficult. Therefore, the present invention displays information such as components mounted on a printed circuit board on the printed circuit board without hindering the manufacturing process of the printed circuit board. The present invention provides a method for forming and processing a display on a printed circuit board. According to the present invention, there is provided a method of forming and processing a display on a printed circuit board, which comprises forming a display such as characters by forming fine irregularities on the surface of a resist coated on the printed circuit board. After mounting, the surface is smoothed by filling the unevenness by applying a coating to the unevenness to render the display unreadable. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a sectional view thereof, and FIGS. 3 and 4 are enlarged views of display. In the figure, a is a printed circuit board, b is a printed character formed by fine irregularities provided on a resist c, c is a resist provided on the printed circuit board surface, d is a coating of a transparent varnish or the like. Material. [0010] A protective film c such as a photoresist generally used as a protective film is provided on the surface of the printed circuit board a. As shown in FIG. 3, on the surface of the resist c,
Printed characters are formed with fine irregularities b that can change the light reflectance. The printed characters thus formed describe information about the electronic components mounted on the printed circuit board. With the displayed information, components can be mounted on the printed circuit board a, a test can be smoothly performed. After the components are mounted, the surface of the resist c is coated with a varnish d. As shown in FIG. 4, fine irregularities b are buried by the varnish d, and the surface is smoothed.
The reflectance of light on the surface becomes uniform, and it is possible to make it impossible to read the display formed by the unevenness b. It is sufficient that the display which needs to be read even after the manufacture is displayed by using a normal printing paint, and only the display to be kept confidential may be coated with a varnish d so as to make it impossible to read. As described above, according to the present invention, it is possible to display information required at the time of manufacturing to efficiently perform the manufacturing process, and to easily read a display to be kept confidential after manufacturing. It is possible to disable.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view illustrating an embodiment of the present invention. FIG. 2 is a sectional view of a printed character portion provided on a printed circuit board. FIG. 3 is an enlarged view of a cross section of a print display unit. FIG. 4 is an enlarged cross-sectional view after a varnish treatment. [Explanation of symbols] a: printed circuit board b: unevenness (display) c: resist d: varnish coating

Claims (1)

Claims: 1. The surface of a resist coated on a printed circuit board is provided with fine irregularities to form a display such as a character, and after the components are mounted, the irregularities are coated by coating the irregularities to thereby fill the surface. A method of forming and processing a display on a printed circuit board, wherein the display is rendered unreadable.