JP2002118369A - Substrate housing case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a substrate housing case where a substrate is prevented from being caught and fixed to a prescribed position when it is housed in a case while guided by a guide rib. SOLUTION: A substrate housing case 10 is provided where a substrate housing part 16 is provided which comprises an open end 14 at one end and houses a substrate 12, and the substrate 12 is guided and inserted by a guide rib 18 protruding between the substrate housing part 16 and the open end 14 before being fixed on the substrate housing part 16. The guide rib 18 comprises a tapered part 18a where the thickness from the wall surface of the substrate housing case increases as advancing from the open end 14 to the substrate housing part 16, a bent part 18b which is bent with a prescribed curvature (r) in cross section and continues to the tapered part 18a, and a vertical part 18c formed between the bent part and the substrate housing part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substrate storage case, and more particularly, to a substrate storage case for guiding a substrate with guide ribs and storing the substrate in the case.

[0002]

2. Description of the Related Art As a substrate housing case, for example, one described in Japanese Utility Model Publication No. 5-25271 is known.

[0003] In this type of substrate housing case, a guide rib is generally provided near an opening end, and the substrate is guided by the guide rib and fixed to the housing portion. In such a substrate housing case, if the substrate is screwed while being hooked on the guide rib, the substrate may be fixed without being in a predetermined position.

[0004]

Therefore, the present invention provides
When a substrate is guided by a guide rib and accommodated in a substrate accommodation case, a substrate accommodation case is provided in which the guide rib is prevented from being caught, and the substrate can be positioned and fixed on a substrate accommodation part as intended. The purpose is to:

It is a second object of the present invention to provide a substrate housing case capable of easily detecting and taking measures when a substrate is caught.

[0006]

According to a first aspect of the present invention, there is provided a semiconductor device having an opening end at least at one end and a substrate accommodating portion for accommodating a substrate therein. In the substrate housing case, which is inserted while being guided by guide ribs provided between the substrate housing portion and the opening end and is fixed on the substrate housing portion, the guide ribs extend from the opening end toward the substrate housing portion. A tapered portion whose thickness from the wall surface of the substrate housing case is enlarged, a curved portion continuous with the tapered portion while being curved at a predetermined curvature in a cross-sectional view, and the curved portion and the substrate housing portion. And a vertical portion formed therebetween.

The tapered portion is configured so that its thickness is increased from the opening end toward the substrate accommodating portion, and a curved portion which is curved at a predetermined curvature in a sectional view and is continuous with the tapered portion is provided. Therefore, when the substrate is guided by the guide ribs and accommodated in the substrate accommodating case, the guide ribs can be prevented from being caught, and the substrate can be positioned and fixed on the substrate accommodating portion as expected.

According to a second aspect of the present invention, the substrate has a thickness t and is screwed with a screw having a length 1 to be fixed on the substrate accommodating portion, and the tapered portion and the vertical portion are viewed in cross section. The distance between the intersection formed by the intersection of the two when virtually extended in and the vertical portion is x,
Further, when the length of the vertical portion is c, the shapes of the tapered portion, the curved portion, and the vertical portion are determined so that x ≧ l-ct.

Since the shapes of the tapered portion, the curved portion, and the vertical portion are determined so as to satisfy the above-mentioned conditional expression, screwing cannot be performed when the hooking occurs, and the hooking of the substrate can be easily detected. And necessary measures such as reinsertion can be taken.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a substrate housing case according to an embodiment of the present invention.

First, the structure of a substrate housing case according to the prior art will be described with reference to FIGS. 6 and 7. FIG.
In the following description, "upper" and "lower" indicate the vertical direction with respect to the vertical axis (gravity axis).

FIG. 6 shows a substrate housing case 1 according to the prior art.
FIG. 2 is a cross-sectional view taken along line 00 of FIG. One end (the upper end in the figure; hereinafter, referred to as an “open end”) of the substrate housing case 100 according to the related art is opened so that the substrate 102 can be inserted. Further, a substrate accommodating portion 104 in which the inserted substrate 102 is accommodated and fixed is provided.

[0013] Between the substrate accommodating portion 104 and the open end,
When the substrate 102 is inserted, a plurality of guide ribs 106 are provided to guide it.

FIG. 7 is an enlarged sectional view of the area A shown in FIG. With reference to the figure, the configuration of the guide rib 106 provided on the substrate housing case 100 according to the related art will be described.

In the substrate housing case 100 according to the prior art, as shown in FIG. 7, the substrate 102 is located at the starting position on the opening end side of the tapered portion 106a (the substrate 102 is indicated by a solid line in the figure) or is tapered. Portion 106a and vertical portion 106b
And the like may be caught at a position (the substrate 102 is indicated by a broken line in the figure) or the like, and the accommodation of the substrate 102 may be incomplete.

When the substrate 102 is caught as shown by a solid line in FIG. 7, it can be relatively easily found by visual inspection or the like. However, when the substrate 102 is caught as shown by a broken line, it is screwed. Incomplete containment may be judged to be complete.

In order to solve such disadvantages of the prior art, the substrate housing case according to this embodiment
When the substrate is guided by the guide ribs and accommodated in the substrate accommodating case, the guide ribs are prevented from being caught, and the substrate can be positioned and fixed on the substrate accommodating portion as expected.

FIG. 1 is a top view for explaining a substrate housing case 10 according to this embodiment, and FIG. 2 is a sectional view taken along the line II-II. 1 shows a state in which the board 12 is housed and screwed as described later is completed, and FIG.
2 shows a state before accommodation.

Substrate storage case 10 according to this embodiment
2, is opened at one end (the upper end in the figure; hereinafter, referred to as "opening end 14") as shown in FIG. 2, similarly to the substrate housing case 100 according to the related art described with reference to FIGS.

Further, a step-shaped substrate housing portion 16 is provided below the opening end 14 over the inner periphery of the substrate housing case 10 to which the inserted substrate 12 is fixed.

The substrate accommodating case 10 has a substantially rectangular shape in a top view, and between the opening end 14 and the substrate accommodating portion 16, two sides of the rectangular shape are provided for guiding the substrate 12.
A total of eight guide ribs 18 protrude toward the inside of the substrate housing case 10 at predetermined intervals.

FIG. 3 is an enlarged sectional view schematically showing the periphery of the area B shown in FIG. However, FIG. 3 shows a state in which the substrate 12 is housed. As is apparent from FIG. 3, the thickness of the guide ribs 18 increases from the wall surface 20 (shown in FIG. 1), more specifically, the inner wall surface of the substrate housing case 10 from the open end 14 toward the substrate housing portion 16. A tapered portion 18a formed to have a diameter, a curved portion 18b which is curved at a predetermined curvature r and is continuous with the tapered portion 18a,
Length c formed between curved portion 18b and substrate housing portion 16
And a vertical portion 18c. The guide rib 18
The height from the inner wall surface (wall surface 20) is a, and the length from the opening end 14 to the substrate housing portion 16 is b.

The curved portion 18b is provided within the range of the angle θ,
The substrate contact surface includes a tapered portion 18a and a vertical portion 18c.
Is formed so as to be continuous.

As described above, the tapered portion 18a is
The diameter of the substrate 12 is increased toward the substrate accommodating portion 16 so that when the substrate 12 is accommodated in the substrate accommodating case 10 while being guided by the guide ribs 18, the substrate 12 is positioned at the open end 14 or the tapered portion 18 a. It can be prevented from being caught.

The curved portion 1 is connected to the tapered portion 18a.
8b, even when the substrate 12 is guided from the tapered portion 18a to the vertical portion 18c, it is possible to prevent the substrate 12 from being caught by passing through the curved portion 18b. Can be positioned and fixed as expected.

Next, determination of the shapes of the tapered portion 18a, the curved portion 18b, and the vertical portion 18c will be described. FIG. 4 is an explanatory sectional view schematically showing the periphery of the guide rib 18 as in FIG. In FIG. 4, to facilitate understanding,
The dimensions of each part are shown intentionally different from FIG.

Referring to FIG. 3 and FIG.
The relationship between the dimensions a, b, c, r, and t of each part shown in FIG. 4 is expressed as follows. tan θ = a / (b− (c + x)) (1) The relationship between x and θ is expressed as follows. x = r · sin (θ / 2) When this is rearranged for r, it is expressed as follows. r = x / sin (θ / 2) (2)

Here, x is the tapered portion 18a and the vertical portion 18
This is the intersection formed by the intersection of the two when c is virtually extended in a cross-sectional view, that is, the distance between the point D shown in FIG. 4 and the vertical portion 18c. In the above equations (1) and (2),
When x is determined, the curvature r of the bending portion 18b and the range (angle) θ in which the bending portion 18b is provided are uniquely determined. Therefore, Expressions (1) and (2) are dependent functions of x. is there.

FIG. 5 is an enlarged sectional view schematically showing a section taken along line VV in FIG.

As shown in FIG. 1, after the inserted substrate 12 is accommodated in the substrate accommodating portion 16, it is screwed and fixed near the four corners of the rectangle. The configuration near the screwed portion will be described with reference to FIG.

A screw insertion hole 22 is formed at an appropriate position on the substrate 12. Further, a screw hole 24 is formed at a position corresponding to the substrate housing portion 16. The substrate 12 is fixed by inserting the screws 26 into the screw insertion holes 22 and inserting the screws 26 into the screw holes 24 and tightening.

At this time, as shown in FIG. 5, x is the length l of the screw, the thickness t of the substrate 12, and the length c of the vertical portion 18c.
When the relationship satisfies the following conditional expression (3), if the substrate 12 is caught in the position shown by the solid line, the screw 26 does not reach the screw hole 24 and cannot be screwed. x ≧ l−ct (3) where l−c> c ≧ t.

Based on the conditional expression (3), the shapes of the tapered portion 18a, the curved portion 18b, and the vertical portion 18c are determined by using the expressions (1) and (2).

Accordingly, when the substrate 12 is visually inspected,
Even when it is determined that they are touching (housing) 6
If screwing is not possible, it can be determined that it is hooked, and necessary measures such as reinserting the board 12 can be taken.

In this embodiment, as described above, the tapered portion 18a is configured so that its thickness is increased from the opening end 14 toward the substrate accommodating portion 16. Since the curved portion which is curved at the curvature and is continuous with the tapered portion is provided, when the substrate 12 is guided by the guide rib 18 and accommodated in the substrate accommodating case 10, the guide rib is prevented from being caught and the substrate 12 is secured to the substrate accommodating portion. 16 and can be positioned and fixed as desired.

Further, since the shapes of the tapered portion 18a, the curved portion 18b, and the vertical portion 18c are determined so as to satisfy the conditional expression (3), if the hooking occurs, the screw cannot be screwed. This can be easily detected, and necessary measures such as reinsertion can be taken.

As described above, in this embodiment, at least one end has an open end 14 and a substrate accommodating portion 16 for accommodating the substrate 12 therein is provided. In the substrate accommodating case 10 which is inserted while being guided by the guide ribs 18 protruding between the ends and is fixed on the substrate accommodating portion, the guide ribs extend from the opening end toward the substrate accommodating portion. A tapered portion 18a whose thickness from the wall surface 20 of the case, more specifically the inner wall surface, is enlarged, a curved portion 18b which is curved at a predetermined curvature r in a sectional view and is continuous with the tapered portion, and the curved portion And a vertical portion 18c formed between the substrate accommodating portions.

The substrate has a thickness t and is fixed on the substrate receiving portion by being screwed with a screw 26 having a length 1 and the tapered portion and the vertical portion are virtually extended in a sectional view. Intersection D sometimes formed by the intersection of both
When the distance between the vertical portions is x, and the length of the vertical portion is c, the shapes of the tapered portion, the curved portion, and the vertical portion are such that x ≧ l-ct. As determined.

In the above-described embodiment, the number of the guide ribs 18 is eight. However, the number is not limited to eight and may be another appropriate number.

Although the shape of the open end 14 of the substrate housing case 10 is substantially rectangular, it is not limited to this.
Various shapes such as a polygonal shape may be used.

[0041]

According to the first aspect of the present invention, the thickness of the tapered portion is increased from the opening end toward the substrate accommodating portion, and the tapered portion is curved at a predetermined curvature in a sectional view. The tapered portion is provided with a curved portion, so that when the substrate is guided by the guide ribs and housed in the substrate housing case, the guide ribs are prevented from being caught and the substrate is positioned and fixed on the substrate housing portion as expected. can do.

In the second aspect, the shapes of the tapered portion, the curved portion, and the vertical portion are determined so as to satisfy the conditional expression (x ≧ l−ct). In such a case, screwing cannot be performed, so that it is possible to easily detect that the board is caught, and to take necessary measures such as reinserting the board.

[Brief description of the drawings]

FIG. 1 is a top view of a substrate housing case according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged sectional view schematically showing a periphery of a region B including a guide rib in FIG. 2;

FIG. 4 is an explanatory cross-sectional view schematically showing the periphery of the guide rib of FIG. 2, similarly to FIG. 3;

FIG. 5 is an enlarged cross-sectional view schematically showing a structure along the line VV in FIG. 1;

FIG. 6 is a cross-sectional view of a substrate housing case according to the related art, which is cut at an appropriate position.

FIG. 7 is an enlarged sectional view of a region A in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Substrate accommodation case 12 Substrate 14 Open end 16 Substrate accommodation part 18 Guide rib 18a Taper part 18b Curved part 18c Vertical part 20 Wall surface (of substrate accommodation case) 26 Screw

Claims (2)

[Claims] A substrate accommodating portion for accommodating a substrate therein, wherein the substrate is guided by a guide rib protruding between the substrate accommodating portion and the open end. In the substrate accommodating case which is inserted while being fixed on the substrate accommodating portion, the guide rib comprises: a. A tapered portion whose thickness from the wall surface of the substrate housing case is increased from the opening end toward the substrate housing portion; b. A curved portion which is curved at a predetermined curvature in a sectional view and is continuous with the tapered portion; and c. A substrate accommodating case comprising: a curved portion; and a vertical portion formed between the substrate accommodating portions. 2. The apparatus according to claim 1, wherein said substrate has a thickness of t and is screwed with a screw having a length of l to be fixed on said substrate accommodating portion.
When the tapered portion and the vertical portion are virtually extended in a cross-sectional view, the distance between the intersection formed by the intersection of the two and the vertical portion is x, and the length of the vertical portion is c.
2. The substrate housing case according to claim 1, wherein the shapes of the tapered portion, the curved portion, and the vertical portion are determined so that x ≧ l-ct. 3.