JP2000005858A - Electronic equipment and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a body for an electronic equipment which does not have non-charged portions and can form a good shape of a boss. SOLUTION: This electronic equipment equipped with a body 20 having a boss part 21 comprises a protrusion part 22 at a position where the boss part 21 is installed, and a boss member 24 which has a screw hole 27 and is attached to the protrusion part 22 for constituting the boss part 21. Therefore, since the hole part does not require to be formed deeper inside a die device corresponding to the protrusion part, non-charged portions which tend to occur to a deep hole part can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing for an electronic device such as a personal computer, and more particularly to a boss structure of the housing for an electronic device.

[0002]

2. Description of the Related Art Recently, magnesium alloys are mainly used as materials for electronic devices made of light metal, and these alloys are formed by a die casting method or a thixotropic method. Although these molding methods have differences in the device structure, all of the conditions are 5
The alloy melted at 80 to 750 degrees is converted to approximately 100 to 3
It is injected into a 50-degree mold and molded.

FIG. 4 shows the structure of a conventional electronic device housing. In the electronic device housing 1, the molten metal is introduced from a sprue 2 which is a portion of the mold device into which the molten metal is introduced (in this figure, a portion corresponding to the shape of the electronic device housing immediately after molding will be described. ), The molten metal is introduced into the desired mold by passing through the runner 3. The introduced molten metal spreads over the entire cavity 4 and eventually reaches an air vent 5, and a water pool 6 is further connected to the air vent 5. For this reason, when the molten metal is introduced from the sprue 2, the air can escape to the outside through the air vent 5, whereby the void can be formed without being present inside the housing. .

Here, a plurality of bosses 7 are provided on the electronic device housing 1 for attaching various electronic circuits and the like thereto. The boss 7 is provided integrally with the bottom of the electronic device casing 1 by pouring molten metal into a concave hole formed in the mold, and projects from the bottom of the electronic device casing 1. It is provided to be formed. By forming the screw holes 8 in the boss 7, it is possible to lock electronic circuits and other various components with screws.

[0005]

By the way, the normal boss 7
The hole formed in the mold for forming the hole corresponds to the shape of the boss 7 of the electronic device housing 1 and is perpendicular to the direction of the flow of the molten metal along the cavity 4 of the mold. It is formed in a deep groove shape. In this case, the molten metal easily flows in the direction along the flow of the molten metal in the cavity 4, but the hole shape is perpendicular to the cavity 4, so that as the hole shape becomes deeper, it becomes difficult for the molten metal to flow into the inside. ing.

That is, the temperature of the mold is lower than that of the molten metal, so that when the molten metal comes into contact with the inner wall of the mold, solidification starts quickly. Since the solidification of the molten metal is started before the molten metal enters, an unfilled portion may be generated, and the boss 7 may not be formed in a desired shape or may not have a desired height.

When such a boss 7 is formed,
The screw hole 8 cannot be formed satisfactorily inside, and there may be a problem that the electronic circuit and other various parts cannot be fixed well.

[0008] The present invention has been made based on the above-described circumstances, and has as its object no unfilled portions.
It is an object of the present invention to provide an electronic device having a housing capable of favorably forming a boss shape and a method for manufacturing the same.

[0009]

According to a first aspect of the present invention, a boss is formed by separately forming a housing and a separate member from the housing. And a boss member to be formed.

According to a second aspect of the present invention, there is provided an electronic apparatus comprising: a housing integrally having a projecting portion; and a boss member attached to the projecting portion to form a boss.

According to a third aspect of the present invention, there is provided the electronic apparatus according to the first or second aspect, wherein the boss member is screwed and fixed to the projecting portion. The invention according to claim 4 is characterized in that the protruding portion has a protruding height from the housing within a range of approximately 1.5 to 2.0 times the outer diameter. Item 3. The electronic device according to Item 2.

The invention according to claim 5 is characterized in that the casing is made of a magnesium alloy and the boss member is made of a metal. Equipment.

According to a sixth aspect of the present invention, in the method for manufacturing an electronic device having a housing provided with a boss having a predetermined height, a protrusion is formed at a position where the boss is provided, and the housing is provided. A housing forming step of forming a housing constituting a portion other than the boss portion by introducing molten metal into a mold device, and a boss portion formed by locking and fixing a boss member forming a boss portion to the projecting portion. And a step of forming a boss portion to be formed.

According to the first aspect of the present invention, since the boss member is formed as a member separate from the housing and is attached to the housing to form a boss portion, a portion corresponding to the boss member of the housing is provided. A configuration with a reduced height can be provided.

For this reason, compared with the case where the boss is formed so as to project integrally, the hole does not have to be formed deeply in the mold device corresponding to the projecting portion. It is possible to prevent an unfilled portion, which tends to occur in the portion, from occurring.

Further, by attaching a separately provided boss, it is possible to sufficiently use the boss as a boss. Thereby, a boss part having a sufficient height can be obtained.

According to the second aspect of the present invention, since the housing includes the housing integrally having the protrusion and the boss member attached to the protrusion to form the boss, the boss is formed of the protrusion and the boss member. With this configuration, the height of the protrusion is suppressed.

Therefore, compared with the case where the boss is provided so as to protrude integrally, the depth of the hole formed in the inside of the mold apparatus corresponding to the protruding portion becomes deep, so that the molten metal can be formed. This makes it easy to enter, thereby preventing the occurrence of an unfilled portion in the projecting portion of the housing.

Further, even when the height of the protruding portion is low, the structure can be provided with a separately provided boss member, so that it can be sufficiently used as a boss portion.

Accordingly, even when the boss is provided high, it is possible to make the boss have a sufficient height. According to the invention of claim 3,
Since the boss member is screwed and fixed to the projecting portion, the fixing of the boss member to the projecting portion can be performed reliably and easily.

According to the fourth aspect of the present invention, the projecting portion is
Since the height of the protrusion from the housing is within a range of about 1.5 to 2.0 times the outer shape, if the height is within this range, a pin-shaped portion formed inside the mold device corresponding to the protrusion is provided. It is possible to allow the molten metal to sufficiently enter the member. This makes it possible to prevent the occurrence of unfilled portions.

According to the fifth aspect of the present invention, since the casing is made of a magnesium alloy and the boss member is made of a metal, the casing has sufficient strength even when it is made thin. Since the housing can be formed, and the boss member is formed of a metal material together with the boss member, even if static electricity is stored in an electronic circuit or the like attached to the boss member, the boss member can be formed. It is possible to conduct static electricity to the housing via the member.

As a result, the electronic circuit and the like do not suffer from a defect due to static electricity, and the inside of the circuit is not destroyed by a short circuit of current. Therefore, it is possible to maintain good characteristics of the electronic circuit and the like.

According to the sixth aspect of the present invention, the protrusion is formed at the position where the boss is provided, and the housing constituting the portion other than the boss of the housing is introduced into the mold apparatus for molten metal. And a boss portion forming step of forming a boss portion by locking and fixing a boss member forming the boss portion to the protruding portion, thereby introducing the molten metal into the mold device. In this case, the height of the protruding portion of the housing can be suppressed to form the housing, and accordingly, the hole formed in the mold device corresponding to the protruding portion has an unfilled portion. Can be prevented from occurring.

Further, since a boss member separate from the protruding portion is attached after molding by the mold device, by setting the boss member to a desired length, molding is performed only by the mold device. It is also possible to form a boss having a large protruding length, which has been difficult.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. A housing 20 for an electronic device such as a personal computer made of a magnesium alloy shown in FIG. 1 and made of a light metal has a boss portion 21 for mounting an electronic circuit and other various components inside. In the electronic device housing 20, the electronic device housing 20 is formed by the following procedure in order to form the boss 21.

That is, in order to form the electronic device housing 20, the mold device 30 used in FIG. 3 is used. The mold device 30 has an upper mold 31 and a lower mold 32, and the mold device 30 is formed by meshing these. The mold apparatus 30 is provided with a sprue 33 serving as an inlet for the molten metal, and a runner 34 for guiding the introduction of the molten metal from the sprue 33 into the cavity 35 of the mold apparatus 30 and guiding the molten metal to spread uniformly. Have been. The molten metal guided by the runner 34 is guided into the cavity 35 of the mold device 30.

The molten metal is in a state in which the magnesium alloy is molten, but other than this, for example, a molten metal in which an aluminum alloy is molten can be considered. Cavity 35
In order to form the boss 21 protruding from the bottom surface of the electronic device housing 20 described above, the inner wall surface is recessed by a predetermined diameter to form a hole 36. This hole 36
Does not have the necessary height as the boss portion 21, but the depth of the hole portion 36 is set so as to form the protruding portion 22 having a height up to the middle part of the boss portion 21. ing.

More specifically, when a molten metal of a magnesium alloy is used, as shown in FIG. 2, if the diameter of the projection 22 is d and the height is h, h / d = 1.5 to 2 .0 is provided.

The molten metal filled inside the cavity 35 is
The air reaches an air vent 37 provided at the other end of the cavity 35. The air vent 37 allows air existing inside the cavity 35 to escape from the inside of the cavity 35 to the outside, so that the molten metal introduced into the cavity 35 can reach the pool 38 while preventing the generation of voids inside the cavity 35. It has a configuration to reach.

The molten metal is introduced into the cavity 35 by injection molding and instantaneously reaches the above-described air vent 37. When the molten metal reaches the air vent 37, the temperature of the mold device 30 becomes approximately 100%. Since the temperature is as low as 350 degrees to 350 degrees, solidification of the molten metal as a mold molded product 40 is immediately started from a portion in contact with the inner wall surface of the mold device 30.

Here, after the molded article 40 is formed, the molded article 40 is taken out of the mold apparatus 20, and a screw hole 23 serving as a female screw is formed in the protruding portion 22, and the screw hole 23 is formed. Then, another boss separation body 24 is attached by screwing. The boss separator 24 is formed of a metal material. When the electronic circuit 41 and the like attached to the upper end of the boss separator 24 are charged, the boss separator 24 is electrically charged with respect to the mold 40. Are conducted.

As shown in FIG. 2, in order to enable the boss separation member 24 to be attached by screwing, the boss separation member 24 has bosses corresponding to the screw holes 23 formed in the projecting portions 22. A screw portion 26 is formed to project from the main body 25 of the separation body 24 to a small diameter. That is, a screw portion 26 is formed separately from the main body 25 of the boss separation body 24 so as to project to a small diameter.

The screw portion 26 has a thread groove which is a male screw formed on the outer surface. The thread groove is screwed with the screw hole 23 so that the boss separation member 24 is screwed and fixed to the projecting portion 22. It is configured to be.

The boss separator 24 has an outer diameter substantially equal to the outer diameter of the projection 22. As a result, the outer diameters of the boss portions 21 are made uniform.

A locking hole 27 for locking another member from the upper end downward is formed in the boss separation body 24. The locking hole 27 is for attaching and fixing an electronic circuit 41 which is a component separate from the electronic device housing 20 and other various components.

That is, a screw hole 23 is formed in the protruding portion 22 of the molded product 40, a boss separating member 24 is further provided, and a screw groove is also formed in the screw portion 26.
Is screwed into the screw hole 23 to form the boss portion 21.

Thus, the electronic circuit and various other components can be locked and fixed to the locking hole 27 located in the boss portion 21 via screws or bolts. According to the electronic device housing 20 and the method of manufacturing the electronic device housing 20 having the above-described configurations, the mold device 30 has the holes 36 formed so as to correspond to the protrusions 22. Since the molten metal is introduced into the hole 36 to form the shape of the mold molded product 40, the height of the protruding portion 22 is formed low, that is, the depth of the hole 36 of the mold device 30 is reduced. If it is formed shallow, it is possible to allow the molten metal to enter the inside of the hole 36 satisfactorily.

That is, when the molten metal is introduced into the cavity 35, the diameter of the protruding portion 22 is set to d and the height is set to h so that h / d = 1.5 to 2.0. By setting to, it becomes possible to fill the inside of the hole 36 with the molten metal faster than the solidification of the molten metal is started.

Therefore, even in the case of a magnesium alloy having poor fluidity, which tends to deteriorate in fluidity when it comes into contact with a low-temperature portion inside the cavity 35, the molten metal is sufficiently filled up to the end of the hole 36. It is possible to make it.
As a result, no unfilled portion is formed in the hole 36, and the shape of the protrusion 22 can be favorably formed.

Further, since the boss separation member 24 is separately attached to the projection portion 22 whose height is suppressed by screwing, if the height of the boss separation member 24 is appropriately set,
The boss 21 can be set at a desired height.

Further, since the boss separator 24 is made of metal, even when the electronic circuit 41 or the like is mounted on the upper end side of the boss separator 24, the electronic circuit 41 or the like is charged with static electricity. Without this, it is possible to guide the molded product 40 through the boss separation body 24. That is, the electronic circuit 41 and the like are grounded.

As a result, it is possible to prevent a large current caused by a short circuit from flowing through the electronic circuit 41 and the like, thereby preventing the large current from being broken. Further, since the projecting portion 22 is formed and the boss separation member 24 is screwed and fixed to the projecting portion 22, there is a case where the boss separating member 24 is attached to a portion where no projecting portion 22 is formed. In comparison, there is no inconvenience that a screw thread protrudes from the lower surface of the thin molded product 40, and even when a personal computer or the like is installed on the lower surface as a base, the installation property is improved. It is possible to do. Further, it is not necessary to form a recess for accommodating the head of the bolt in order to make the installation easier.

The embodiment of the present invention has been described above, but the present invention can be variously modified in addition to the above. This is described below. In the above-described embodiment, the boss separation member 24 is screwed to the protruding portion 22. Alternatively, the boss separation member 24 may be attached to the protruding portion 22 by press fitting or caulking. I do not care.

Further, the screw portion 26 provided on the boss separation body 24 and the screw hole 23 may be provided in reverse. That is, the lower end side of the boss separation body 24 is suddenly received, and a screw hole is formed in this portion.
May have a small diameter, and a thread may be formed on the outer surface to form a screw portion. In addition, various modifications can be made without departing from the scope of the present invention.

[0046]

As described above, according to the present invention,
A configuration in which the height of a portion corresponding to the boss member of the housing is suppressed can be provided. For this reason, compared with the case where the boss portion is formed so as to protrude integrally, the hole portion does not need to be formed deeply in the mold device corresponding to the protruding portion. It is possible to prevent unfilled portions, which tend to occur, from occurring.

By attaching a separately provided boss, the boss can be sufficiently used. Thereby, a boss part having a sufficient height can be obtained.

Further, if a housing having an integral projection is provided, the depth of the hole formed corresponding to the above-mentioned projection is increased inside the mold apparatus, so that the molten metal can enter easily. It is possible to prevent an unfilled portion from being generated in the projecting portion of the housing.

[Brief description of the drawings]

FIG. 1 is an exemplary perspective view showing the shape of an electronic device housing according to an embodiment of the present invention;

FIG. 2 is a side sectional view showing a state near a boss portion according to the embodiment;

FIG. 3 is a side sectional view showing the shape of the mold apparatus according to the embodiment.

FIG. 4 is a perspective view showing a shape of a conventional electronic device housing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 ... Housing for electronic devices 21 ... Boss part 22 ... Projection part 23 ... Screw hole 24 ... Boss separation body 26 ... Screw part 27 ... Locking hole 30 ... Die apparatus 31 ... Upper die 32 ... Lower die 35 ... Cavity 40 … Molded products

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobuyuki Takagi 2-9-9 Suehirocho, Ome-shi, Tokyo F-term in the Toshiba Ome Plant (reference) 4E360 EA27 ED02 ED17 EE17 EE08 GA52 GB42 GB45 GC02 GC04 4F204 AH42 EA04 EB01 EW24

Claims (6)

[Claims] 1. An electronic device comprising: a housing; and a boss member formed of a member separate from the housing and attached to the housing to form a boss. 2. An electronic device, comprising: a housing integrally having a projection; and a boss member attached to the projection to form a boss. 3. The electronic device according to claim 1, wherein the boss member is screwed and fixed to the protrusion. 4. The projection according to claim 1, wherein the height of the projection from the housing is within a range of about 1.5 to 2.0 times the outer diameter of the housing. Electronic equipment. 5. The electronic device according to claim 1, wherein the housing is made of a magnesium alloy, and the boss member is made of a metal. 6. A method of manufacturing an electronic device having a housing provided with a boss having a predetermined height, wherein a protrusion is formed at a position where the boss is provided, and a portion of the housing other than the boss is provided. Forming a housing by introducing a molten metal into a mold device; and forming a boss by locking and fixing a boss member forming the boss to the protruding portion. A method for manufacturing an electronic device, comprising: