JPH0786103A - Cover structure for electrolytic capacitor - Google Patents

Abstract

PURPOSE:To provide a cover structure for electrolytic capacitor which minimizes adverse effect on other components upon burst of the electrolytic capacitor and prevents secondary troubles. CONSTITUTION:A hole 12 is made through a cover 11 at a position immediately above an electrolytic capacitor 8. The hole 12 has substantially same size as an antiburst valve 8a. A peripheral wall 13 is also formed surround the upper part of the electrolytic capacitor 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover structure for covering an electrolytic capacitor mounted on a substrate.

[0002]

2. Description of the Related Art FIG. 4 is a plan view showing a motor board on which an electrolytic capacitor is mounted, and FIG. 5 is a plan view showing a conventional cover for covering the motor board.

In both figures, a motor substrate 1 is mounted on a carriage portion of an impact printer, is fixed to a back side of a plate 2 and has a connector 3 attached thereto.
A slit disk 4 for detecting the position of the spacing motor is mounted on the plate 2. Openings 5 and 6 are formed in the plate 2, and a photosensor 7 and an electrolytic capacitor 8 are mounted on the motor substrate 1 exposed from the openings 5 and 6. The electrolytic capacitor 8 is provided to stabilize the drive power source for the print head (not shown). An explosion-proof valve 8a is provided on the top of the electrolytic capacitor 8.

The cover 9 shown in FIG. 5 is provided in order to prevent dust such as paper dust of the printing paper from entering due to the impact of the print head during printing. The circular portion 9a of the cover 9 covers the slit disk 4, and the rectangular portion 9b covers the electrolytic capacitor 8. When the motor board 1 is covered with the cover 9, the locking claws 9c of the cover 9 are used to plate the plate 2.
The cover 9 is fixed by locking the locking portion 10.

[0005]

However, in the above-described conventional cover structure, if an overvoltage is applied to the electrolytic capacitor, the electrolytic capacitor explodes, breaks through the explosion-proof valve, and the contents of the electrolytic capacitor jump upward. As a result, the cover is blown off, and burst dust or electrolytic solution is scattered around, short-circuiting the circuit or damaging the parts, which causes a secondary obstacle to parts other than the electrolytic capacitor.

The present invention has been made in view of the above problems, and an object thereof is to provide a cover structure for an excellent electrolytic capacitor which prevents secondary damage to other parts even if the electrolytic capacitor should explode. It is to be.

[0007]

In order to solve the above-mentioned problems, the present invention has a structure of a cover for covering a cylindrical electrolytic capacitor from above, in which a hole having substantially the same shape as the explosion-proof valve of the electrolytic capacitor is provided in the explosion-proof valve. It is formed immediately above, and a peripheral wall having a diameter larger than that of the electrolytic capacitor is provided around the hole on the electrolytic capacitor side.

[0008]

According to the present invention having the above-mentioned structure, when the electrolytic capacitor explodes, the contents of the electrolytic capacitor jump out from the hole to above the cover. At this time, the peripheral wall provided around the hole on the electrolytic capacitor side of the cover can prevent scattering of the burst dust around the electrolytic capacitor. Therefore, it is possible to prevent a secondary failure from occurring in components other than the electrolytic capacitor.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. Note that elements common to the drawings are given the same reference numerals. FIG. 1 is an end view showing a cover structure of an embodiment of the present invention, and FIG. 2 is a plan view showing a state in which the cover of the embodiment is mounted.

In both figures, the cover 11 of this embodiment has a hole 1 at a position immediately above the electrolytic capacitor 8 when mounted.
2 is formed. The diameter of the hole 12 is substantially the same as the diameter of the explosion-proof valve 8a of the electrolytic capacitor 8. A peripheral wall 13 is integrally formed around the hole 12 on the electrolytic capacitor 8 side of the cover 11. The length L of the peripheral wall 13 is equal to the cover 11
To the explosion-proof valve 8a, the upper part of the electrolytic capacitor 8 is covered from the surroundings.
The rib 14 supports the peripheral wall 13. The electrolytic capacitor 8 is mounted on the motor board 1.

When the electrolytic capacitor 8 explodes due to overvoltage, the contents of the electrolytic capacitor 8 pierce the explosion-proof valve 8a and jump out from above. The burst dust and the electrolytic solution jumping out from the electrolytic capacitor 8 are guided to the hole 12 by the peripheral wall 13 and jump out from the hole 12 to the outside of the cover 11. That is, the burst dust and the electrolytic solution caused by the explosion are unlikely to be scattered on the other parts below the cover 11, and the influence on these parts can be minimized, and the occurrence of the secondary failure can be prevented. be able to.

In the present embodiment, the length L of the peripheral wall 13 is longer than the distance to the explosion-proof valve 8a, but if the length to the explosion-proof valve 8a is at least the burst dust or the like to other parts. You can prevent it from flying.

FIG. 3 is a bottom view showing a cover according to another embodiment of the present invention. In the drawing, a hole 12 is formed in the cover 11 as in the above embodiment, and a peripheral wall 15 is integrally formed on the lower side (electrolytic capacitor side) around the hole 12. Perimeter wall 1
A notch 16 is provided in a part of 5. The notch 16 is formed in a direction in which other components are not mounted when the cover 11 is mounted. Therefore, by providing the notch 16, the content of the electrolytic capacitor 8 will be the same when the electrolytic capacitor 8 explodes.
Although there is a risk of popping out of the car, there are no other parts in the direction of popping out, so there is no secondary failure.
In this embodiment, by providing the cutout 16, it is possible to save the material of the peripheral wall 15.

[0014]

As described in detail above, according to the present invention, the cover and the peripheral wall for covering the electrolytic capacitor are provided with holes and peripheral walls. Since it pops out, it is possible to prevent the occurrence of a secondary obstacle to other parts.

[Brief description of drawings]

FIG. 1 is an end view showing a cover structure of an embodiment.

FIG. 2 is a plan view showing a state in which the cover of the embodiment is mounted.

FIG. 3 is a bottom view showing a cover of another embodiment.

FIG. 4 is a plan view showing a motor board on which an electrolytic capacitor is mounted.

FIG. 5 is a plan view showing a conventional cover.

[Explanation of symbols]

 8 Electrolytic capacitor 8a Explosion-proof valve 11 Cover 12 Hole 13 Peripheral wall

Claims (2)

[Claims] 1. A structure of a cover for covering a cylindrical electrolytic capacitor from above, wherein a hole having substantially the same shape as that of the explosion-proof valve of the electrolytic capacitor is formed directly above the explosion-proof valve, and the electrolytic capacitor side is provided with an electrolyzer around the hole. A cover structure for an electrolytic capacitor, wherein a peripheral wall having a diameter larger than that of the capacitor is provided. 2. The cover structure for an electrolytic capacitor according to claim 1, wherein a lower end of the peripheral wall is located below a position of the explosion-proof valve.