JPH0587939U - Electrolytic capacitor - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] A positioning correction symbol is provided in the display of the electrolytic capacitor to improve the certainty of display appearance inspection in image processing. [Arrangement] A feature of the present invention is that a blank or additional marking for positioning correction is provided at a substantially central portion of a polarity display symbol displayed on the outer surface of the bottom of the electrolytic capacitor.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in the display symbol of an electrolytic capacitor that is soldered and mounted on a substrate by a reflow method or the like.

[0002]

[Prior Art]

 Conventionally, the polarity of a polar aluminum electrolytic capacitor is displayed by displaying the polarity, rating, etc. on the tube that covers the metal case, and as shown in Fig. 4, a part of the cathode side shown on the outer surface of the bottom of the metal case. It was common to fill in the cathode display and to display all or part of the rating, company mark, lot number, series name, etc. in letters or symbols on the other parts.

[0003]

[Problems to be solved by the device]

 The necessary display of aluminum electrolytic capacitors is performed by printing or laser marking during the manufacturing process, but display defects such as misalignment of display, shading, missing display, double display error, etc. occur. Therefore, it is necessary to visually remove all defective products, but it is very difficult to completely remove them. If image quality can be automatically determined by image processing using recent automation technology, productivity and reliability can be further improved, and automation of visual inspection is an important issue.

As a specific automatic visual inspection, so-called pattern matching is performed in which an original product of displayed characters and symbols is captured as a master pattern, is memorized and recognized, and is discriminated from the same recognition content in a workpiece to be inspected. The method is commonly used. However, if the posture or position of the work to be inspected is displaced or tilted, there is no other way than to find the print center that serves as the reference for the displayed characters and symbols and correct the position based on that reference. .. For this reason, if the reference display itself is misaligned, shaded, or lacked, this position correction is not performed properly, and it is highly likely that an erroneous determination is made, which poses a serious problem in yield management. In addition, since the vicinity of the outer periphery of the bottom surface of the case is curved due to the characteristics of the case when it is manufactured, the display is often unclear, which has been a problem.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention stores a capacitor element in a bottomed metal case, fits a sealing body into the opening of the case, and seals the aluminum electrolytic capacitor with a polar, An electrolytic capacitor having a rating or the like provided with a blank for position correction or a retouched display at the approximate center of the polarity display symbol.

[0006]

[Action]

 In the present invention, a blank part is provided in the approximate center of the polarity symbol displayed on the bottom outer surface of the bottomed case of the electrolytic capacitor, or a positioning correction display is added from the approximate center of the polarity symbol. Polarity, rating, lot number, marking status of company display will be positioned automatically in the inspection, and judgment by pattern matching will be ensured.

[0007]

【Example】

 The present invention will be described below based on the embodiment shown in FIG. Figure 1 shows an example of a display that shows polarity display 1, lot No. 2, rated capacity 3, and rated voltage 4 on the outer surface of the bottom of the aluminum electrolytic capacitor, with a blank area 5 formed on the center of the polarity display 1. is there. Therefore, in the automatic inspection, the inclination of the work image to be inspected can be accurately positioned in the X-coordinate and the Y-coordinate by the vertical straight line portion of the polarity display 1 and the horizontal line of the blank portion 5. It can be detected by Chig. 2 shows another display example, and FIG. 3 shows the case of bipolar display.

In the above-mentioned embodiment, the outer surface of the bottom of the cylindrical case, that is, the one that can be directly viewed from the mounting surface when mounted on the printed circuit board has been described. It goes without saying that it can be applied.

[0009]

[Effect of the device]

 As described above, in the electrolytic capacitor of the present invention, the polarity is displayed by blanking or adding to the approximate center of the polarity displayed on the outer surface of the bottom of the bottomed case, so automatic inspection of the displayed state is ensured. It has the effect that it can be used for automation, and can also be used for automation of mounting the electrolytic capacitor of the present invention on a substrate, which is industrially beneficial.

[Brief description of drawings]

FIG. 1 is a bottom view of an embodiment of a display of an aluminum electrolytic capacitor according to the present invention.

FIG. 2 is a bottom view of another embodiment of the display of the aluminum electrolytic capacitor according to the present invention.

FIG. 3 is a bottom view of another embodiment of the display of the aluminum electrolytic capacitor according to the present invention.

FIG. 4 is a bottom view of a display example of a conventional aluminum electrolytic capacitor.

[Explanation of symbols]

 1, polarity display 2, lot No. 3, rated capacity 4, rated voltage 5, blank area

Claims (1)

[Scope of utility model registration request] 1. An electrolytic capacitor in which a capacitor element is housed in a bottomed metal case, a sealing body is fitted in an opening of the case, and the outer surface of the case bottom of the electrolytic capacitor is sealed to indicate polarity, rating, and the like. 2. An electrolytic capacitor, characterized in that a blank for position correction or a retouching display is provided at a substantially central portion of the polarity display symbol.