JPH02177499A - Electronic apparatus housing - Google Patents

Abstract

PURPOSE:To improve the electromagnetic shield in a housing by providing a hole at a printed board for placing electronic components, and bringing a protrusion plate provided at a partition plate into direct contact with that provided at the housing. CONSTITUTION:A protrusion plate 1a is provided longitudinally at the center of a housing body 1. A partition plate 2a is provided at the position opposed to the protrusion plate 1a protruding from the housing body 1 in a cover 2. A long hole 3a of a diameter to be engaged with the protrusion plate 1a is formed at the longitudinal center of a printed board 3 in a structure in which the protrusion plate 1a is brought into contact with the partition plate 2a when the housing is assembled. The printed board 3 placing the electronic components 4 is aligned, the protrusion plate 1a is engaged with the long hole 3a, and clamped fixed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a local oscillator used in the microwave band, and particularly to D/U (DU ratio) of spurious noise caused by leakage of electromagnetic force from other electronic components. ) to improve
This invention relates to an electronic device housing with improved electromagnetic shielding.

[Prior Art] Conventionally, this type of electronic device housing has been designed as shown in FIG. That is, the electronic component 1 is placed inside the housing body 11.
A printed circuit board 13 on which 4 was mounted was fixed with screws, and a lid 12 having a partition plate 12a inside was placed over the top surface of the printed circuit board 13 to form a housing.

[Problems to be Solved] - The conventional electronic device housing mentioned above allows the electronic components mounted in the housing to be removed by pressing the printed circuit board mounted inside the housing body with a partition plate protruding inside the lid. I was trying to create an electromagnetic shield.

However, in conventional electronic device casings, a printed circuit board is interposed between the casing body and the lid, and the two are not in contact with each other. Therefore, a space equivalent to a material with a certain dielectric constant exists between the two, and the frequency signal of one electronic component leaks to the other electronic component, causing the other electronic component to receive a There was a problem with the impact.

As a means to solve this problem, it is conceivable to use two printed circuit boards and completely separate them. However, in this case, the printed circuit board has to be separated into two parts, which reduces the effective area of the printed circuit board, and also requires a cable, etc. to be used to receive signals from both sides, and to receive power from both sides. The problem is that it doesn't.

The present invention has been made in view of the above-mentioned problems.
The purpose of the present invention is to provide an electronic device housing in which electronic circuits are completely separated by a partition plate by providing holes in a printed circuit board on which electronic components are mounted, thereby improving electromagnetic shielding.

[Means for Solving the Problems] In order to achieve the above object, the electronic device casing of the present invention has the following features:
A casing body having an open surface and a protrusion plate therein; a casing body attached to the opening of the casing body and having a partition plate at a position facing the protrusion plate; The structure includes a printed circuit board having a hole that can be fitted into the protrusion plate.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram of an electronic a''JAJA housing showing an embodiment of the present invention, and FIG. 2 is a plan view of a pudding board fixed inside this embodiment.

Note that this embodiment will be explained based on a local oscillator having a voltage controlled oscillator (VCO) and a plurality of PLL circuits for controlling its frequency.

In the drawings, reference numeral 1 denotes an electronic device casing body (hereinafter referred to as casing body), which has an open top surface. A protrusion plate 1a is provided in the longitudinal direction of the interior center of the casing body 1.

On the other hand, 2 is a lid. Inside this lid, there is one main body l.
A partition plate 2a is provided at a position facing the protrusion plate 1a protruding from the partition plate 2a, and has a structure in which the partition plate 2a abuts inside when the housing is assembled.

Reference numeral 3 denotes a printed circuit board, and the printed circuit board 3 is provided with an elongated hole 3a having a diameter that can be fitted into the protruding plate 1a of the housing body l in the longitudinal direction of the center of the printed circuit board 3. and.

A signal line 3b is formed on the surface of the printed circuit board 3 so that signals can be received and passed between the electronic components separated by the protrusion plate 1a and the partition plate 2a and power supply can be transferred by assembling the casing. Printing is performed through a portion other than the elongated hole 3a.

Therefore, according to the electronic device housing having such a configuration, first, the printed circuit board 3 on which the electronic component 4 is mounted is positioned inside the housing body 1, the elongated hole 3a is inserted into the protruding plate 1a, and the screw is inserted. Tighten and secure.

Then, M2 is covered from the top surface of the casing body 1 to assemble the electronic device casing.

1. Although this example shows an example in which two electronic components such as a voltage controlled oscillator (VCO) are mounted, even if there are three or more electronic components, holes of the required shape and number can be provided on the printed circuit board. , and by providing the partition plate and the protruding plate at required locations, the same function can be achieved.

[Effects of the Invention] As explained above, the present invention has the effect of further improving the electromagnetic shielding inside the casing because the partition plate and the protruding plate come into direct contact by providing holes in the printed circuit board on which electronic components are mounted. be.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of an electronic device casing showing an embodiment of the present invention, Fig. 2 is a plan view of a printed circuit board fixed inside this embodiment, and Fig. 3 is a diagram of a conventional electronic device casing. FIG.

Claims (1)

[Claims] a casing body that is open on one side and has a protrusion plate therein; a lid attached to the opening of the casing body and having a partition plate at a position facing the protrusion plate; An electronic device casing comprising a printed circuit board having a hole that can be fitted into a protrusion plate.