JPH067309Y2 - Instrument housing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a housing suitable for use in a measuring instrument, particularly a high-frequency electronic measuring instrument.

An example of the housing of the measuring instrument is shown in FIG. In the figure, reference numeral 1 denotes a bezel made of aluminum die casting, and mounting arms 1a to 1d are provided on the back side thereof. 2a and 2b are side plates made of metal press parts, and the side plate 2a is the mounting arm 1
The side plate 2b is attached to a and 1b, and the side plate 2b is attached to the attachment arms 1c and 1d by screws. Reference numeral 2c denotes a rear plate attached to the side plates 2a and 2c on the side opposite to the bezel 1. The rear plate, the bezel 1 and the side plates 2a and 2b form a square-shaped chassis. Alternatively, electric components are arranged. 3 is a handle, which is a spring material (SU
The spring plate 3a, which is composed of the plate 3a of S), the tube 3b that covers the plate 3b, and the brackets 3c and 3d, and the tube 3b that covers the spring plate 3a is attached to the side plate 2b by a screw through the brackets 3c and 3d.

Reference numeral 4 denotes a cover made of a metal material, and as shown in the YY sectional view in FIG. 3, an opening 4a having a width with which the handle portion 3 is fitted is formed on one side surface along the longitudinal direction. .
In the cover 4 having such a U-shaped cross section, the opening 4a has the handle 3
The chassis composed of the side plates 2a and 2b and the rear plate 2c is inserted so as to fit into the, and thereby a measuring instrument casing is formed. Reference numerals 6a and 6b denote rear legs, and these rear legs are attached to the rear plate 2c with screws while the cover 4 is attached to the inner case. 7a to 7d are lower legs,
It is attached to the bottom of the cover 4. 7e and 7f are the legs 7
Anti-slip rubber attached to a and 7b, 7g for leg 7
It is a stand attached to c and 7d.

<Prior Art> For example, in such a measuring instrument housing, the back side of the bezel 1 and one end of the cover 4 are joined, and a conventional example of the joining portion (arrow A) is shown in FIG. In FIG. 4, reference numeral 1 denotes a bezel, and a step 11 is provided on the rear portion of the bezel over the entire circumference. The end surface 4b portion of the front surface portion of the cover 4 shown in FIG. 2 is fitted into this step portion.

However, in such a step-type fitting, electrical connection is insufficient and becomes unstable. As a result, the measuring instrument,
In particular, the case impedance of a measuring instrument that handles high frequencies increases, causing various problems. Further, in the high frequency measuring instrument, electromagnetic radiation noise is generated between the bezel 1 and the cover 4 on the bezel 1 in an L shape (route C in FIG. 4).
→ D → E) Reflects and leaks easily. Also, it is easy to get in the opposite direction.

<Problems to be Solved by the Invention> The present invention has been made to solve such problems, and its purpose is to lower the impedance of the housing without changing the structure of the conventional housing for measuring instruments basically. And improved noise resistance.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention provides a measuring instrument casing that is configured by joining and attaching a metal case to a metal bezel. A groove is provided in the bezel in the part and a plurality of ribs are formed in this groove, and the end of the front surface of the case is fitted into the groove via the rib. Hereinafter, the embodiment will be described in detail with reference to FIG.

<Embodiment> FIGS. 1 (a) and 1 (b) are configuration diagrams of an embodiment of a main part of a measuring instrument housing according to the present invention, and (b) is a cross-sectional view taken along line XX of FIG. 1 (a). It is a figure. In both (a) and (b) of FIG. 1, reference numeral 1 denotes a main part of the bezel shown in FIG. Since the other parts have the same structure as in FIG. 2, their drawings and description are omitted. In FIG. 1, grooves 12 are formed over the entire circumference on the back side of the bezel 1, and a plurality of ribs 12a are provided at equal intervals in this groove. After the cover 4 shown in FIG. 2 is mounted on the inner case, the rear plate is screwed by the rear legs 6a and 6b, and the front end 4 of the cover 4 is removed.
b fits into a groove 12 formed over the entire circumference of the back side of the bezel 1. In this case, the width of the groove 12 is configured to be slightly larger than the plate thickness of the cover 4, but the groove width is smaller by the height of the plurality of ribs 12a formed in the groove 12 and is 0 than the plate thickness of the case 4. The size is about 1 to 0.2 mm, and the rib 12a holds the case 4. As a result, the impedance between the bezel 1 and the cover 4 is reduced, and at the same time, the electromagnetic radiation noise is cut into the U-shaped groove 12 between the bezel case, so that the noise having a wavelength longer than the width of the groove 12 is cut ( Route F → G in FIG. 1 (a). Electromagnetic waves shorter than the width of the groove 12 are several tens of GHz or more, so there is no problem in practical use. <Effects of the Present Invention> As described above, according to the present invention, a groove is formed in a metal bezel and a plurality of ribs are formed in the groove, and the end portion of the metal cover is inserted through the rib. Since the housing is configured so as to be fitted in the groove, (a) the bezel can surely contact the cover at the rib portion, and thus the impedance of the housing can be reduced.

(B) Since the case is received by the groove formed in the bezel, the route of electromagnetic radiation noise becomes a blind alley by the groove, and the noise from the joint is less likely to come and go.

(C) The basic structure of the case need not be complicated. The present invention can be used for a measuring instrument, particularly a high-frequency electronic measuring instrument, to obtain a suitable housing.

[Brief description of drawings]

1 (a) and 1 (b) are configuration diagrams of a main part of an embodiment of a case according to the present invention, and FIG. 2 is an exploded perspective view of a measuring instrument case for explaining the present invention. The figure shows YY of the cover in FIG.
FIG. 4 is a sectional view showing the configuration of the main part of a conventional housing. 1 ... bezel, 12 ... groove, 12a ... rib, 4 ... cover.

Claims (1)

[Scope of utility model registration request] 1. A measuring instrument casing constructed by joining and attaching a metal cover to a metal bezel, wherein a groove is provided in the bezel at the joining portion and a plurality of grooves are provided in the groove. A casing for a measuring instrument, characterized in that a rib is formed, and an end face of a front surface portion of the case is fitted into the groove via the rib.