JP2013123801A - Member fixing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a member fixing method configured to firmly fix a wood top plate provided on the upper surface of a resin casing in simple structure and procedure.SOLUTION: In the method of joining a first member having a non-through hole formed on the surface to a second member having a through hole, the first member is abutted on the second member so that the non-through hole is positioned on one opening part of the through hole. A thermally melted thermoplastic resin is injected from the other opening of the through hole until entering the non-through hole of the first member. The thermally melted thermoplastic resin is injected until the resin is overflown from the other opening part and the overflown resin cannot pass through the through hole.

Description

  The present invention relates to a member fixing method applied to, for example, attachment of a top plate of an audio device.

  In order to produce a texture that matches the interior of a stationary audio device, it may be possible to equip the top surface of the housing with a wooden top plate. In general, since the housing is made of resin, the wooden top plate is assembled on the upper surface of the resin housing with, for example, double-sided tape.

Japanese Utility Model Publication No. 61-196022

  The audio device has a built-in heat source such as a power circuit and a power amplifier, and this heat is conducted to the lower surface of the top board through the housing. Further, the resin casing does not pass humidity and the bottom surface of the top plate hardly changes in humidity, whereas the top surface of the top plate is exposed to the outside air so that the humidity changes. Due to the humidity difference and temperature difference between the front surface and the back surface, the wooden thin plate is warped. There is a case where the warping force of the top plate is larger than the adhesive force of the double-sided tape, and the double-sided tape is peeled off due to the warping force, and the corners of the top plate may be rolled up.

  In addition, as a structure for preventing curling up due to warping, it is conceivable to provide a locking portion for inserting the top plate at the corner or peripheral edge of the top surface of the housing. However, providing the locking portion complicates the structure of the housing. In addition, it is not preferable in terms of the appearance of the housing. In addition, as a method of adhering a wooden board to a resin base material other than a method of providing a locking portion, a method described in Patent Document 1 has been proposed.

  An object of the present invention is to provide a member fixing method capable of firmly fixing a wooden top plate mounted on an upper surface of a resin casing with a simple structure and procedure.

  The member fixing method of the present invention is a method of fixing a first member having a non-through hole on a surface and a second member having a through hole, wherein the non-through hole is formed in one opening of the through hole. The first member is brought into contact with the second member so as to be positioned, and the thermally melted thermoplastic resin enters the non-through hole of the first member from the other opening of the through hole. Injecting and further injecting the heat-melted thermoplastic resin until it overflows from the other opening and the overflowed portion cannot pass through the through hole.

  Moreover, you may use the member by which the surface was comprised with the timber at least as said 1st member.

  Furthermore, the second member is a resin-made housing that houses an electronic circuit that generates heat, and the first member is a composite material in which a natural wood sheet is bonded to both sides of a resin-made backer material, It is good also as a top plate affixed on the upper surface of the said housing | casing.

  According to the present invention, a member having a non-through hole on the surface can be firmly fixed to a member having a through hole with a simple structure and procedure.

External view of speaker device to which this invention is applied Top view of speaker device Top view of the speaker device with the top plate removed View of the upper housing of the speaker device from the inside Sectional view of the joint between the top plate and the upper housing The figure which shows the other form of a 1st member

  A speaker device to which the present invention is applied will be described with reference to the drawings. 1 is an external view of a speaker device to which the present invention is applied, FIG. 2 is a plan view of the speaker device, and FIG. 3 is a plan view of a torso speaker device with a top plate removed. The speaker device 1 is a device called a so-called desktop audio system, which includes an FM tuner and an optical disk playback device, and is connected to a portable electronic device such as a portable audio player, and the music stored in the portable electronic device is speakered. It is a device that reproduces with.

  The speaker device 1 includes a resin upper housing 2 that forms the front, top, and left and right side surfaces of the device, and a metal lower housing 3 that forms the bottom and back of the device. A circuit serving as a heat source including a power supply circuit and a power amplifier circuit is built in the housing.

  On the front of the apparatus, left and right speakers 11, a disk tray 12, and a display 13 are provided. An operation panel 10 is provided on the center front side of the upper surface of the apparatus, and a wooden top plate (wood table 4) is provided at a place other than the operation panel 10 on the upper surface of the apparatus.

  In addition to various button switches, the operation panel 10 is provided with a dock connector 15 for connecting a portable electronic device, a USB connector 16, and a snooze button 14 for stopping an alarm sound.

  On the upper surface of the apparatus, the peripheral portion 21 and the operation panel 10 are higher than the flat portion 20 at the center. The flat portion 20 is surrounded by the peripheral edge portion 21 and the operation panel 10 and has a substantially U shape. A wooden top plate 4 is fitted and fixed to the flat portion 20.

  As shown in FIG. 5, the top plate 4 has a natural wood sheet 40 having a thickness of about 0.5 mm bonded to both surfaces of a resin-made backer material 41 having a thickness of about 0.6 to 0.7 mm. It is a composite material.

  As shown in FIG. 3, a long hole 22 is formed at an appropriate position of the flat portion 20. The position of the long hole 22 is formed at a position where the top plate 4 is rolled up when the top plate 4 is warped on the flat portion 20, that is, at a position near the corner of the top plate 4. In this embodiment, eight long holes 22 are provided along the periphery of the flat portion 20, but the number is not limited to eight. Further, the shape is not limited to the “long hole”, and the place may be another place such as a peripheral corner.

  With reference to FIG. 4 and FIG. 5, the process of attaching the top plate 4 to the upper housing | casing 2 is demonstrated. 4 is a view of the upper housing of the speaker device as viewed from the inside, and FIG. 5 is a cross-sectional view of the joint between the top plate and the upper housing.

  At the time of assembling the upper housing 2 of the speaker device 1, the top plate 4 is attached to the flat portion 20 with a double-sided tape (temporarily fixed). After that, as shown in FIG. 4, the upper housing 2 is turned upside down, and the thermoplastic resin 5 that is thermally melted into the elongated hole 22 is injected from the inside of the upper housing 2.

  The heat-melted thermoplastic resin 5 is obtained by heating and melting a thermoplastic resin with a dedicated gun, and is generally called by a name such as hot melt or hot bond. Hereinafter, in this embodiment, the hot-melted thermoplastic resin 5 is referred to as a hot melt 5. The hot melt 5 is a work material that has high fluidity in a molten state and enters a fine hole, but quickly solidifies when cooled to room temperature. Moreover, the surface of the top plate 4 is the natural wood sheet 40 as described above. The natural wood sheet 40 is porous having many small holes of several tens to several hundreds of micrometers on the surface.

  The hot melt 5 injected into the long hole 22 is filled into the long hole 22 to form the body portion 50. When the hot melt 5 is further injected and the tip of the trunk portion 50 reaches the natural wood sheet 40 of the top plate 4, it enters a small hole on the surface of the natural wood sheet 40. When the hot melt 5 that has entered the small holes is cooled to room temperature, it solidifies in the shape of the small holes (porous shape) to form the anchor portion 52. By this anchor portion 52, the hot melt 5 is bonded to the top plate 4 and cannot be detached.

  In the assembling process, a sufficient amount of hot melt 5 is injected, overflows from the long hole 22, spreads in a shade shape inside the upper housing 2, and forms an undercut portion 51. When the undercut portion 51 is also cooled to room temperature, it solidifies in the shape of a shade, and the hot melt 5 is prevented from coming out of the upper housing 2, that is, in the direction of the top plate 4.

  As described above, the hot melt 5 is bonded to the top plate 4 by the anchor portion 52, and further, the hot melt 5 is not detached from the upper housing 2 (flat portion 20) by the undercut portion 51. Further, since the volume decreases in the process of hot melt 5 solidifying, the force for attracting the top plate 4 and the upper housing 2 is also increased. Thus, the top plate 4 is firmly fixed to the upper housing 2 (flat portion 20) by the hot melt 5.

  The surface of the top plate 4 may not be natural wood, but may be porous porous. In this embodiment, the application of fixing the top plate 4 of the speaker device 1 to the upper housing 2 has been described as an example. However, the present invention can be applied to other applications. For example, you may apply to the use which fixes a panel to a partition. Moreover, the 1st member of this invention does not need to be plate shape. It is only necessary that a permeation hole through which the hot melt 5 permeates is formed on the fixed surface. For example, even if it is a metal, an alumite, a magnesium alloy, etc. can be used as the 1st member.

  Further, as shown in FIG. 6, by forming permeation holes 60 and 61 into which the hot melt 5 permeates in a shape that swells inside on the back surface of the fixed member 6 (the surface that contacts the fixing member), a resin or the like is formed. Even a smooth material can be fixed by the method of the present invention. Further, by making the permeation holes 60 and 61 non-through holes (blind holes), they can be fixed without affecting the surface side. In FIG. 6, the permeation hole 60 is a row in which many small holes are opened, and the permeation hole 61 is an example in which one large hole is formed. The number and size of the permeation holes may be determined as appropriate.

DESCRIPTION OF SYMBOLS 1 Speaker apparatus 2 Upper housing | casing 4 Top plate 5 Hot melt (thermomelted thermoplastic resin)
20 Flat part 22 Long hole 40 Natural wood sheet 51 Undercut part 52 Anchor part

Claims (3)

A method of fixing a first member having a non-through hole on a surface and a second member having a through hole,
Bringing the first member into contact with the second member such that the non-through hole is located at one opening of the through hole;
From the other opening of the through hole, heat-melted thermoplastic resin is injected until it enters the non-through hole of the first member,
Further, the member fixing method is characterized by injecting the heat-melted thermoplastic resin until it overflows from the other opening and the overflowed portion cannot pass through the through hole.   The member fixing method according to claim 1, wherein a member having at least a surface made of wood is used as the first member. The second member is a resin casing that houses an electronic circuit that generates heat inside.
The member fixing method according to claim 2, wherein the first member is a top plate made of a composite material in which a natural wood sheet is bonded to both surfaces of a resin-made backer material, and is attached to the upper surface of the housing.

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