JPH10333779A - Board supporting device and portable information equipment housing circuit board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a board supporting device in which any wasteful space can be excluded from between a circuit board and a board supporting wall. SOLUTION: A board supporting device is provided with a board supporting wall 31 having an upper face 31a, lower face 31b positioned at the opposite side to this upper face 31a, and through hole 42 opened on those upper face and lower face, circuit board 35 arranged along the upper face of the board supporting wall 31, screw 63 for fixing the circuit board 35 to the board supporting wall 31, and metallic screw bearing 50 supported by the board supporting wall 31 and faced to the through hole 42. The screw bearing 50 is provided with a recessed part 51 for housing a screw head 63a. The recessed part 51 is recessed so as to be inserted from the direction of the lower face of the board supporting wall 31 into the through hole 42, and this is provided with a bottom board 52 continued to the upper face of the board supporting wall 31, and a screwing hole 61 into which the screw is screwed is opened in this button board 52.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable information device such as a portable computer having a circuit board housed in a housing, and more particularly to a structure for fixing the circuit board to the housing.

[0002]

2. Description of the Related Art A typical portable computer as a portable information device includes a housing made of a synthetic resin having a keyboard, and a display unit supported by the housing.

[0003] The housing has a flat box shape having a bottom wall, an upper wall, and a peripheral wall, and a circuit module is housed inside the housing. The circuit module includes a circuit board,
Various circuit components such as a semiconductor package mounted on the circuit board are provided. According to a conventional general portable computer, the circuit board is arranged along the bottom wall of the housing, and is fixed to the bottom wall via a plurality of screws.

FIG. 9 discloses a structure for supporting a circuit board in a conventional portable computer. In FIG. 9, reference numeral 1 denotes a housing, and 2 denotes a circuit board. The housing 1 has a bottom wall 3 and an upper wall 4 facing each other. At a plurality of locations on the bottom wall 3, seat portions 5 protruding upward are integrally formed. The upper end of the seat 5 forms a flat substrate support surface 5a, and a screw insertion hole 6 is opened in the substrate support surface 5a.

The upper wall 4 has a plurality of bosses 7 projecting downward. The boss 7 has a flat substrate support surface 7 a facing the seat 5,
a is provided with a screw hole 8.

The circuit board 2 is provided on the board supporting surface 5 of the seat 5.
a and the substrate support surface 7 a of the boss 7. The circuit board 2 has a through-hole 9 connected to the screw insertion hole 6 and the screw hole 8.

A screw 10 is inserted into the screw insertion hole 6 of the seat 5 from below the bottom wall 3. The screw 10 is screwed into the screw hole 8 of the boss 7 via the through hole 9 of the circuit board 2. By this screwing, the circuit board 2 is sandwiched between the board supporting surfaces 5a and 7a and fixed to the housing 1.

For this reason, the circuit board 2 has a height H of the seat 5.
And a space S corresponding to the height H of the seat 5 is formed between the circuit board 2 and the bottom wall 3.

[0009]

By the way, in recent portable computers, the size and weight of the housing 1 have been promoted in order to enhance portability. It tends to become larger and larger.

However, according to the conventional portable computer, the circuit board 2 is fixed to the seat 5 protruding upward from the bottom wall 3 of the housing 1. Is separated from the bottom wall 3 by an amount corresponding to the following condition, and a useless space S exists between the circuit board 2 and the bottom wall 3.

Therefore, the space S is one of the factors that hinder the thinning of the housing 1, and there is still room for improvement in realizing the thinning of the housing 1.

A first object of the present invention is to provide a substrate supporting apparatus capable of eliminating useless space between a circuit board and a substrate supporting wall. A second object of the present invention is to provide a portable information device capable of eliminating useless space between a circuit board and a housing and realizing a thinner housing.

[0013] A third object of the present invention is to realize a portable information device capable of realizing a thinner housing, securely grounding a circuit board to the housing, and enhancing an electromagnetic shielding function of the housing. To get the equipment.

[0014]

In order to achieve the first object, a substrate supporting apparatus according to a first aspect of the present invention has a first surface and an opposite side to the first surface. A second surface, a through-hole opened in the first and second surfaces,
A circuit board disposed along a first surface of the substrate supporting wall; a screw for fixing the circuit board to the substrate supporting wall; supported by the substrate supporting wall; A metal screw receiver facing the through hole. The screw receiver has a recess for accommodating the head of the screw, and the recess is recessed so as to enter the through hole from the direction of the second surface of the substrate support wall, and the substrate A bottom plate is provided on the first surface of the support wall, and the bottom plate has an insertion hole through which the screw is inserted.

In such a configuration, to fix the circuit board to the board supporting wall, first, the circuit board is arranged on the first surface of the board supporting wall. Next, a screw is inserted into the insertion hole of the screw receiver, and the screw is made to penetrate the circuit board. Then, the head of the screw enters into the concave portion of the screw receiver and abuts against the bottom plate of the screw receiver, and the head is accommodated in the concave portion.

Further, since the bottom plate of the screw receiver is continuous with the first surface of the substrate supporting wall, the circuit board is fixed along the first surface of the substrate supporting wall. There is no wasteful space between the substrate support wall.

Accordingly, the fixed portion of the circuit board can be made thinner, in addition to the fact that the head of the screw does not protrude significantly outside the board support wall. In order to achieve the second object, a portable information device according to a sixth aspect of the present invention includes a first wall having a through hole and a first wall facing the first wall and facing the first wall. Second having a boss extending
A circuit board having a screw insertion hole disposed between the first wall and the second wall of the housing and interposed between the through hole and the boss portion. A screw that is screwed into the boss portion through the through hole and the screw insertion hole to fix the circuit board to the housing; and a metal supported by the first wall and facing the through hole. Screw holders;
It has.

The screw receiver has a concave portion which is recessed so as to enter the through hole of the first wall, and the head portion of the screw is housed in the concave portion.
A bottom plate is provided at an open end of the through-hole and in contact with the circuit board, and an insertion hole through which the screw is inserted is opened in the bottom plate.

In such a configuration, in order to fix the circuit board to the housing, first, the circuit board is interposed between the first wall and the second wall of the housing, and the screw is inserted through the circuit board. The hole is located between the boss and the insertion hole for the screw receiver. next,
A screw is inserted through the insertion hole of the screw receiver, and the screw is screwed into the boss through the screw insertion hole of the circuit board. As a result of this screwing, the head of the screw enters into the recess of the screw receiver and abuts against the bottom plate of the screw receiver, so that the circuit board is sandwiched between the bottom plate of the screw receiver and the boss.

At this time, since the bottom plate of the screw receiver is in contact with the circuit board at the opening end of the through hole, the circuit board is fixed to the housing in a posture along the first wall. There is no wasteful space between the substrate and the first wall.

Further, since the head of the screw is accommodated in the recess of the screw receiver, the head does not protrude greatly outside the housing. As a result, the fixed portion of the circuit board can be formed thin and compact, and the housing can be made thin.

In order to achieve the third object, a first aspect is provided.
The portable information device described in 1 includes a first wall having a through hole, and a second wall having a boss portion facing the first wall and extending toward the through hole. A housing made of a synthetic resin including; a screw insertion hole disposed between the first wall and the second wall of the housing and interposed between the through hole and the boss portion; A circuit board having a ground land at a position corresponding to the screw insertion hole;
A screw that is screwed into the boss portion through the through hole and the screw insertion hole to fix the circuit board to the housing; and a metal screw receiver disposed in the through hole in the first wall. And; The first wall of the housing has an inner surface covered with a conductive shield layer, and the screw receiver has a recess recessed into a through hole of the first wall, and a recess formed in the recess. A plurality of locking portions formed on a peripheral edge, removably locked to the first wall and in contact with the shield layer, and a head portion of the screw is housed in a recess of the screw receiver. Along with this, the concave portion has a bottom plate in contact with the circuit board at an open end of the through hole,
An insertion hole through which the screw is inserted is opened in the bottom plate.

In such a configuration, in order to fix the circuit board to the housing, first, the circuit board is interposed between the first wall and the second wall of the housing, and the screw is inserted through the circuit board. The hole is located between the boss and the insertion hole for the screw receiver. next,
A screw is inserted through the insertion hole of the screw receiver, and the screw is screwed into the boss through the screw insertion hole of the circuit board. As a result of this screwing, the head of the screw enters into the recess of the screw receiver and abuts against the bottom plate of the screw receiver, so that the circuit board is sandwiched between the bottom plate of the screw receiver and the boss.

At this time, since the bottom plate of the screw receiver is in contact with the circuit board at the opening end of the through hole, the circuit board is fixed to the housing in a posture along the first wall. There is no wasteful space between the substrate and the first wall.

Moreover, since the head of the screw is accommodated in the recess of the screw receiver, the head does not protrude greatly outside the housing. As a result, the fixed portion of the circuit board can be formed thin and compact, and the housing can be made thin.

When the circuit board is sandwiched between the bottom plate of the screw receiver and the boss, the land of the circuit board contacts the bottom plate of the screw receiver. At the same time, since the locking piece of the screw receiver is in contact with the shield layer of the first wall, the land of the circuit board is electrically connected to the shield layer via the screw receiver.

Therefore, the circuit board through which a high-speed signal flows can be reliably grounded to the housing, and the electromagnetic shielding function of the housing can be enhanced by using the fixed portion of the circuit board.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. 1 to 8 applied to a portable computer. FIG. 1 shows a book-shaped portable computer 21. The computer 21 includes a computer main body 22 and a display unit 23 supported by the computer main body 22.

The computer main body 22 has a housing 24 made of synthetic resin. The housing 24 has a flat box shape having a bottom wall 24a, left and right side walls 24b and 24c, a front wall 24d, an upper wall 24e (second wall), and a rear wall (not shown). The side walls 24b and 24c, the front wall 24d, and the rear wall are connected to the bottom wall 24a and the upper wall 24e. The bottom wall 24a and the upper wall 24e face each other in the thickness direction of the housing 24.

The upper wall 24e of the housing 24 is
6 and a keyboard mounting section 27. The palm rest 26 is provided at the front end of the housing 24.
Extending in the width direction. The keyboard mounting portion 27 is located behind the palm rest 26, and a keyboard 28 is attached to the keyboard mounting portion 27.

The display unit 23 includes a flat box-shaped display housing 29a and a liquid crystal display 29b housed inside the housing 29a. The display unit 23 includes a housing 24
Is connected to a rear end portion via a hinge device (not shown). Therefore, the display unit 23 is rotatable between a closed position covering the palm rest 26 and the keyboard 28 and an open position exposing the palm rest 26 and the keyboard 28.

As shown in FIG. 2 and FIG.
Includes a battery storage unit 30. The battery housing 30 is located below the palm rest 26. The battery housing 30 is provided on the bottom wall 24 a of the housing 24.
And a recess that is continuously open to the front wall 24d. The battery housing section 30 has a flat ceiling wall 31 which also serves as a substrate support wall (first wall). The ceiling wall 31 has an upper surface 31a as a first surface and a lower surface 31b as a second surface. Upper surface 3 of ceiling wall 31
1a faces the palm rest 26, and
It is exposed inside. The lower surface 31b of the ceiling wall 31
It is exposed to the battery housing 30.

A battery pack 32 is removably accommodated in the battery accommodating section 30. The battery pack 32 functions as a power supply for driving the portable computer 1, and has a box-shaped battery case 33 that fits tightly into the battery housing 30.

As shown in FIGS. 3 and 4, a circuit module 34 is housed inside the housing 24. The circuit module 34 includes a circuit board 35 and the circuit board 35.
And a circuit component 36 such as a semiconductor package and a connector mounted on the semiconductor device. The circuit board 35 is arranged in parallel with the bottom wall 24 a of the housing 24. This circuit board 35
Is a lower surface 35a facing the bottom wall 24a and an upper wall 24e.
And an upper surface 35b facing the same. The front end 37 of the circuit board 35 projects above the battery housing 30, and the lower surface 35 a of the front end 37 faces the upper surface 31 a of the ceiling wall 31.

The front end 37 of the circuit board 35 has a plurality of lands 39 electrically connected to a ground wiring layer (not shown) of the circuit board 35, and a plurality of screw insertion holes 40. The land 39 has a rectangular shape having a predetermined area, and is exposed on the lower surface 35a and the upper surface 35b of the circuit board 35. The screw insertion holes 40 penetrate the circuit board 35 in the thickness direction at positions corresponding to the lands 39, and the opening edges of these screw insertion holes 40
It is connected to land 39.

As shown in FIGS. 2 to 4, the ceiling wall 31 of the battery housing section 30 has a plurality of through holes 42 and engagement holes 43. The through hole 42 is provided in the circuit board 3.
5 are formed at positions corresponding to the lands 39. These through holes 42 are formed by square holes having four edges orthogonal to each other, and the upper surface 31 a and the lower surface 3 of the ceiling wall 31 are formed.
1b. Therefore, the through hole 42
The through-hole 4 penetrates through the ceiling wall 31 in the thickness direction.
The opening area of No. 2 is set to substantially the same size as the land 39.

The engagement holes 43 penetrate the ceiling wall 31 in the thickness direction, and are respectively adjacent to the through holes 42. Further, the inner surface of the housing 24 including the upper surface 31a of the ceiling wall 31,
It is covered with a shield layer 44 having conductivity.
The shield layer 44 is deposited on the inner surface of the housing 24,
It is connected to the opening edge of the through hole 42 and the engagement hole 43.

As shown in FIG.
Is opposed to the upper surface 35b of the circuit board 35. A plurality of boss portions 46 (only one is shown) extending downward are integrally formed on the inner surface of the palm rest 26. The boss portion 46 is connected to the land 39 of the circuit board 35.
The lower end of each boss 46 is a flat substrate support surface 46a.

For this reason, the substrate support surface 46a of the boss portion 46
Corresponds to the through hole 42 of the ceiling wall 31 with the circuit board 35 interposed therebetween.
And face each other. A metal nut 48 having a screw hole 47 is inserted into the boss portion 46. The screw hole 47 of the nut 48 is opened in the substrate supporting surface 46a,
It is connected to the screw insertion hole 40 of the circuit board 35.

As shown in FIGS. 4 and 7, screw receivers 50 are disposed in the through holes 42 of the ceiling wall 31, respectively. The screw receiver 50 is formed by press-molding a conductive metal material such as stainless steel, for example, and has a plate shape thinner than the ceiling wall 31.

The screw receiver 50 has a concave portion 51 that enters the through hole 42. The recess 51 is, as shown in FIG.
The bottom plate 52 includes a flat square bottom plate 52 and first to fourth side plates 53a to 53d connected to the periphery of the bottom plate 52. The recess 51 is recessed from the direction of the lower surface 31 a of the ceiling wall 31 toward the inside of the through hole 42, and the recess amount R of the recess 51 is set to be substantially equal to the thickness dimension T of the ceiling wall 31. I have.

Flange-shaped locking pieces 54a to 54d are formed at the tips of the first to third side plates 53a to 53d, respectively. The locking pieces 54a to 54d are connected to the ceiling wall 31.
It is detachably locked to the peripheral edge of the opening of the through-hole 42 opened in the lower surface 31b of the base. At this time, the locking surface 55 which is one step lower than the upper surface 31a is formed on the periphery of the opening of the through hole 42.
Are formed on the locking surface 55, and the locking pieces 54a are formed on the locking surface 55.
~ 54d are caught. For this reason, the locking piece 54a
To 54d are positioned on substantially the same plane as the lower surface 31b of the ceiling wall 31.

As shown in FIG. 4, the first locking piece 54
a has an extension 57 bent into a crank shape. The extension portion 57 is inserted into the engagement hole 43,
The tip is detachably locked to the peripheral edge of the opening of the through hole 42 opened in the upper surface 31a of the ceiling wall 31.

As shown in FIG. 6, the bottom plate 52 has a pair of tongue pieces 58a and 58b. These tongue pieces 58
a, 58b are first locking pieces 5 having the above-mentioned extension portions 57;
The front end of the through hole 42 is located on the opposite side of the upper surface 31a of the ceiling wall 31 so as to be detachably locked.

At this time, a lower locking surface 59 which is one step lower than the upper surface 31b is formed at the periphery of the opening of the through hole 42, and the tip of the extension 57 and the tongue piece 58a are formed on the locking surface 59. , 58b are hooked. For this reason, the tip of the extension portion 57 and the tongue pieces 58a, 58b are located on substantially the same plane as the upper surface 31a of the ceiling wall 31.

The screw receiver 50 is attached to the ceiling wall 31 in the following procedure. As shown in FIG. 8B, first, the extension 57 of the first locking piece 54a is inserted into the engagement hole 43 from the direction of the lower surface 31b of the ceiling wall 31,
The recess 51 is located below the through hole 42.

Next, the screw receiver 50 is rotated upward about the contact portion between the extension portion 57 and the engagement hole 43 as a fulcrum. By this rotation, the recess 51 enters the through hole 42 from the direction of the lower surface 31 b of the ceiling wall 31, and the tip of the extension 57
And the first to fourth locking pieces 54 a to 54 d contact the locking surface 55 of the ceiling wall 31.

Next, the screw receiver 50 is slid along the locking surfaces 55 and 59 toward the side opposite to the engaging hole 43, and the tongue pieces 58 a and 58 b are hooked on the locking surface 59 of the ceiling wall 31. As a result, the first to fourth locking pieces 54a to 54a to
The ceiling wall 31 is sandwiched between 54d and the tip of the extension 57 and the tip of the tongue pieces 58a, 58b in the thickness direction, and the screw receiver 50 is fixed to the ceiling wall 31.

As shown in FIG. 4, when the screw receiver 50 is fixed to the ceiling wall 31, the bottom plate 52 of the concave portion 51 is located at the opening end of the through hole 42, and is substantially flush with the upper surface 31 a of the ceiling wall 31. They are located on the same plane. An insertion hole 61 is formed in the center of the bottom plate 52. The insertion hole 61 is formed in the screw insertion hole 4 of the circuit board 35.
It is linked to 0.

As shown in FIG. 5, the shield layer 44 on the inner surface of the housing 24 also continuously covers the locking surface 59 connected to the upper surface 31a of the ceiling wall 31. Tip of extension 57 of receiver 50 and tongue 58
a and 58b are in contact. Therefore, the screw receiver 50 is
It is electrically connected to the shield layer 44 via the extension portion 57 and the tongue pieces 58a and 58b.

A metal screw 63 is inserted into the insertion hole 61 of the screw receiver 50. The screw 63 is connected to the circuit board 35
Is screwed into the screw hole 47 of the boss portion 46 through the screw insertion hole 40. By this screwing, the head 63a of the screw 63 enters the concave portion 51 of the screw receiver 50, contacts the bottom plate 52 of the concave portion 51 and the circuit board 35.
In the through hole 42.

As a result, the bottom plate 52 of the screw receiver 50 and the board supporting surface 46a of the boss portion 46 are tightened in a direction approaching each other, and the circuit board 35 is sandwiched between the bottom plate 52 and the board supporting surface 46a. I have. For this reason, the circuit board 35 is supported by the upper surface 31 a of the ceiling wall 31 in a state where the lower surface 35 a is in contact with the bottom plate 52 of the screw receiver 50,
The circuit board 35 and the ceiling wall 31 are, for example, 0.2 m
They face each other with a clearance of about m.

The land 39 on the lower surface 35a of the circuit board 35 is pressed against the bottom plate 52 of the screw receiver 50, and the land 39 and the shield layer 44 of the housing 24 are electrically connected via the screw receiver 50. ing.

According to such a configuration, the bottom plate 52 of the screw receiver 50 in contact with the circuit board 35 is substantially flush with the upper surface 31a of the ceiling wall 31 at the opening end of the through hole 42. Reference numeral 35 is fixed to the housing 24 in a posture along the upper surface 31a of the ceiling wall 31. Therefore, a useless space can be eliminated from between the circuit board 35 and the ceiling wall 31.

Further, since the head 63a of the screw 63 is accommodated in the recess 51 of the screw receiver 50, the head 63a does not protrude greatly below the ceiling wall 31, that is, toward the battery accommodating section 30. As a result, the fixed portion of the circuit board 35 can be formed thin and compact, and accordingly, the thickness of the housing 24 can be reduced.

When the circuit board 35 is sandwiched between the bottom plate 52 of the screw receiver 50 and the board support surface 46a of the boss 46, the ground land 39 of the circuit board 35 is attached to the bottom plate 52 of the screw receiver 50. Contact. Therefore, the land 39 is connected to the shield layer 4 of the housing 24 via the screw receiver 50.
4 is electrically connected to the circuit board 3 and flows a high-speed signal.
5 can be reliably grounded to the housing 24.

Therefore, the electromagnetic shield function of the housing 24 can be enhanced by using the screw receiver 50 for fixing the circuit board 35. In the above-described embodiment, the fixed portion between the ceiling wall of the battery accommodating portion and the circuit board has been described as an example. However, the present invention is not limited to this, and the bottom wall of the housing and the circuit board may be fixed. You may apply to the fixed part with a board | substrate.

Further, the portable information device according to the present invention is not limited to a portable computer, but can be similarly implemented with other information devices such as a text creating device.

[0059]

As described above, according to the first, sixth and eleventh aspects of the present invention, wasteful space can be eliminated from between the circuit board and the board supporting wall (first wall). The head of the screw can also be accommodated in the recess of the screw receiver. As a result, the fixed portion of the circuit board can be formed thin and compact, and the housing can be thinned accordingly.

According to the eleventh aspect, since the ground land of the circuit board is electrically connected to the shield layer of the housing via the screw receiver, the circuit board through which a high-speed signal flows can be mounted on the housing. It can be reliably grounded. Therefore, the electromagnetic shield function of the housing can be enhanced by using the screw receiver for fixing the circuit board.

[Brief description of the drawings]

FIG. 1 is an exemplary perspective view of a portable computer according to an embodiment of the present invention;

FIG. 2 is a perspective view showing a state in which a battery pack is removed from a battery accommodating portion of a housing and a screw receiver is exposed;

FIG. 3 is a perspective view showing a positional relationship between a ceiling wall of a battery housing and a circuit board.

FIG. 4 is a sectional view showing a state in which the circuit board is fixed to a housing.

FIG. 5 is an enlarged cross-sectional view showing a portion X in FIG. 4;

FIG. 6 is a perspective view of a screw receiver.

FIG. 7A is a perspective view showing a state in which a screw receiver is fixed to a ceiling wall of a battery housing. FIG. 3B is a plan view showing a state in which the screw receiver is fixed to the ceiling wall of the battery housing section, as viewed from the lower surface side of the ceiling wall. (C) is a plan view of the state in which the screw receiver is fixed to the ceiling wall of the battery accommodating portion, as viewed from the upper surface side of the ceiling wall.

FIG. 8A is a cross-sectional view illustrating a positional relationship between a screw insertion hole of a circuit board and a screw receiver. (B) is sectional drawing which shows the state which attaches a screw receiver to a ceiling wall.

FIG. 9 is a cross-sectional view showing a conventional structure for fixing a circuit board and a housing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 24 ... Housing | casing 31 ... 1st wall, board | substrate support wall (ceiling wall) 35 ... Circuit board 39 ... Land 40 ... Screw insertion hole 42 ... Through-hole 44 ... Shield layer 46 ... Boss part 50 ... Screw receiver 51 ... Concave part 52 ... bottom plate 61 ... insertion hole 63 ... screw 63a ... head

Claims (11)

[Claims] 1. A substrate support having a first surface, a second surface opposite to the first surface, and a through-hole opened in the first and second surfaces. A wall; a circuit board disposed along a first surface of the board support wall; screws for fixing the circuit board to the board support wall; and a screw supported by the board support wall and formed in the through hole. Facing the metal screw receiver, the screw receiver has a recess for accommodating the head of the screw, and the recess enters the through hole from the direction of the second surface of the substrate support wall. And a bottom plate that is recessed as described above and is continuous with the first surface of the substrate support wall, and an insertion hole through which the screw is inserted is opened in the bottom plate. 2. The screw receiver according to claim 1, wherein the screw receiver has a plurality of locking pieces connected to a peripheral edge of the recess, and the locking pieces are removably locked to the circuit board. A substrate support device, comprising: 3. The device according to claim 1, wherein the through hole penetrates through the substrate support wall in a thickness direction, and a recess amount of the recess is determined so as to correspond to a thickness of the substrate support wall. A substrate supporting device, comprising: 4. The substrate supporting wall according to claim 2, wherein said substrate supporting wall is made of a synthetic resin material.
The substrate support device is characterized in that the surface of the substrate is covered with a conductive shield layer, and the locking piece of the screw receiver is in contact with the shield layer. 5. The substrate supporting apparatus according to claim 1, wherein the circuit board has a ground land, and the bottom plate of the screw receiver is in contact with the land. 6. A housing comprising: a first wall having a through-hole opened therein; and a second wall facing the first wall and having a boss extending toward the through-hole; A circuit board disposed between the first wall and the second wall of the housing and having a screw insertion hole interposed between the through hole and the boss portion; and a circuit board passing through the through hole and the screw insertion hole. And a screw for fixing the circuit board to the housing; and a metal screw receiver supported by the first wall and facing the through hole. The receiver has a concave portion that is recessed so as to enter the through hole of the first wall, and the head portion of the screw is housed in the concave portion. The bottom plate has an insertion hole through which the screw is inserted. Portable information device, characterized in that. 7. The circuit according to claim 6, wherein the first wall has an inner surface exposed inside the housing, a bottom plate of the screw receiver is connected to the inner surface, and the circuit is connected to the first wall. The portable information device, wherein the substrate is sandwiched between a tip of the boss and a bottom plate of the screw receiver when the screw is screwed into the boss. 8. The screw receiver according to claim 5, wherein the screw receiver has a plurality of locking pieces connected to a peripheral edge of the recess, and the locking pieces are removably locked to the circuit board. Portable information equipment characterized by the following. 9. The method according to claim 8, wherein the inner surface of the first wall is covered with a shield layer having conductivity, and the locking piece of the screw receiver is in contact with the shield layer. Characteristic portable information equipment. 10. The portable information device according to claim 9, wherein the circuit board has a ground land, and the bottom plate of the screw receiver is in contact with the land. 11. A synthetic resin housing including: a first wall having a through hole formed therein; and a second wall facing the first wall and having a boss extending toward the through hole. And a body; a screw insertion hole disposed between the first wall and the second wall of the housing, interposed between the through hole and the boss, and corresponding to the screw insertion hole. A circuit board having a land for ground at a position; a screw that is screwed into the boss portion through the through hole and the screw insertion hole to fix the circuit board to the housing;
A metal screw receiver disposed in a through hole of the wall of the first case; the first wall of the housing has an inner surface covered with a conductive shield layer; And a plurality of locking pieces formed on a peripheral edge of the recess and removably locked to the first wall and in contact with the shield layer, the recesses being recessed so as to enter the through holes of the first wall. The head of the screw is housed in the recess of the screw receiver, and the recess has a bottom plate that contacts the circuit board at the open end of the through hole. A portable information device, wherein an insertion hole to be inserted is opened.