JP2009294698A - Reinforced housing structure for portable electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a housing structure which satisfies thinning, weight saving and robustness for portable electronic equipment such as a portable communication terminal device and portable information terminal equipment. <P>SOLUTION: The housing structure for the portable electronic equipment includes a metallic bathtub-shaped reinforcement plate 101 formed in a bathtub shape by raising its outer peripheral portion nearly vertically. Through-holes 105 are bored in the metallic bathtub-shaped reinforcement plate 101, and a film 106 made of a resin material is stuck on at least a portion of one surface or both surfaces of the metallic bathtub-shaped reinforcement plate 101 in which the through-holes 105 are bored. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a reinforced case structure of a portable electronic device such as a portable communication terminal device or a portable information terminal device.

  In recent years, in the case of portable electronic devices such as portable communication terminal devices and portable information terminal devices, especially in the case of notebook personal computer terminals (hereinafter referred to as “notebook PCs”), not only have they become thinner and lighter. Satisfying the static load resistance characteristics against surface pressure and the like and the dynamic load characteristics against drop impact force, that is, achieving both a reduction in thickness and weight and robustness are indispensable requirements.

  Here, since a liquid crystal display panel (hereinafter referred to as “LCD panel”) made of a very fragile base material such as a glass plate is generally used for a display portion of a notebook PC, in recent years, surface pressure has been increased. Various proposals have been made regarding a housing structure that prevents the LCD panel from being damaged even when a drop impact force is applied. In particular, LCD panels used in notebook PCs have become very thin with respect to their area, and it is the most effective means to take measures against the housing top panel on the LCD panel side, improving the top panel material rigidity. For this purpose, a material using a special high-rigidity material, a material having a complicated cross-sectional shape for the purpose of increasing the cross-sectional secondary moment of the top plate in order to increase the rigidity with a general material, and the like have been proposed.

  Further, as a measure other than applying to the LCD panel side casing top plate, a reinforcing plate made of a metal material is disposed between the LCD panel side casing top plate and the LCD panel, and the LCD panel is made of this metal material. A structure that is held by a reinforcing plate has been proposed. Toshiba Review, Vol. 62, no. 11 (2007), page 46, FIG. 8 (Non-patent Document 1), an LCD panel reinforcing structure for a notebook PC that holds an LCD panel with a bathtub-shaped LCD cover is disclosed in Japanese Patent Application Laid-Open No. 2007-110482 (Patent Document 1). ) Discloses a reinforcing structure for a portable electronic device in which a display unit is mounted on a substantially plate-shaped reinforcing frame.

  Furthermore, as another technique, Japanese Patent Laying-Open No. 2001-313487 (Patent Document 2) discloses a heat insulating member structure for an electronic component in which a spacer formed in a columnar shape is sandwiched between film-like skins having low thermal conductivity.

JP 2007-110482 A ([0014] to [0016], FIG. 3) JP 2001-313487 A ([0039] to [0042], FIG. 1) Toshiba Review, Vol. 62 No. 11 (2007) (p. 46, FIG. 8)

However, the structure using a special high-rigidity material for the top plate requires a gap of a certain amount or more to absorb the bending deformation of the top plate when an external force is applied between the top plate and the LCD panel. For example, when a high-rigidity material such as stainless steel is used for the top plate in order to suppress bending deformation of the top plate, the thickness can be reduced, but the density of the stainless material is 8000 kg / m ³ . It is impossible to reduce the weight because it is large. Furthermore, even in the case of a structure in which the cross-sectional shape of the top plate is convex or concave and the cross-sectional moment is increased, the step between the convex and concave is increased to obtain sufficient rigidity, for example, a magnesium alloy having a thickness of 0.5 mm. In this case, it is necessary to secure a step of about 4 mm, and it is possible to reduce the weight, but it is difficult to reduce the thickness.

Further, as in Non-Patent Document 1 and Patent Document 1, a reinforcing plate made of a metal material is arranged between the housing top plate on the LCD panel side and the LCD panel, and the LCD panel is made of the reinforcing plate made of this metal material. In the case of the structure to hold, it is not necessary to use a high-rigidity metal material such as stainless steel for the top plate, and it is not necessary to form irregularities that increase the moment of inertia of the cross section. In order to obtain sufficient rigidity, a high-rigidity material such as a stainless steel material is used for the reinforcement plate. Similarly to the above, the density of the stainless steel material is as large as 8000 kg / m ³ , so the weight reduction is It was difficult.

  Here, in order to achieve weight reduction, a method of forming a plurality of through holes in the flat portion of the reinforcing plate is generally used. For example, the through holes are formed in a flat plate made of a stainless material of 230 mm × 110 mm. When the weight is reduced by about 60%, the bending rigidity is reduced to about half, and the function as a reinforcing plate cannot be exhibited. Conversely, when the through hole is formed to such an extent that the bending rigidity is not reduced (for example, about 20% reduction), the weight can be reduced only by about 35%. That is, since the number of through holes that can be formed is limited in order not to significantly reduce the bending rigidity of the reinforcing plate, it has been difficult to achieve both significant weight reduction and robustness of the reinforcing plate.

  Patent Document 2 proposes a structure for eliminating the influence of external heat and temperature changes on the electronic component and maintaining the use temperature of the electronic component at an appropriate temperature. Material such as sponge rubber, polystyrene, glass wool, silicone resin, hard urethane resin, foamed urethane resin is used, and the Young's modulus of the material is several tens of MPa to several hundreds of MPa. Cannot be improved.

  In other words, in the conventional structure, there has been a trade-off between thinning and weight reduction of the LCD side casing and improving robustness.

  The present invention satisfies not only the reduction in thickness and weight but also the static load resistance against surface pressure and the like and the dynamic load resistance against drop impact force, that is, the reduction in thickness and reduction in weight and robustness. An object of the present invention is to provide a reinforced case structure of a portable electronic device such as a portable communication terminal device or a portable information terminal device.

  In a first aspect, a reinforced case structure of a portable electronic device according to the present invention includes a metal bathtub-shaped reinforcing plate that is formed in a bathtub shape by raising an outer peripheral portion substantially vertically, and has a metal bathtub shape. A through hole is formed in the reinforcing plate, and a film made of a resin material is attached to at least a part of one side or both sides of the metal bathtub-shaped reinforcing plate in which the through hole is formed. Here, the “bathtub-shaped reinforcing plate” is not only a reinforcing plate in the shape of a box-shaped container with the outer peripheral portion raised substantially vertically, but also a plate-shaped reinforcing plate added from the rising portion. Including.

  In a second aspect, a portable electronic device according to the present invention includes the above-described casing structure.

  According to the present invention, not only thinning and weight reduction of the LCD side housing structure of a portable electronic device such as a notebook PC but also static load resistance against surface pressure and the like and dynamic load resistance against a drop impact force and the like. Satisfying the requirements, making it possible to achieve both thinness, light weight and robustness.

  The film can be attached to either the bathtub-corresponding inner surface of the metal bathtub-shaped reinforcing plate having through holes or the opposite surface. Here, the “inner surface corresponding to the bathtub bottom surface” is a portion corresponding to the inner side of the bottom surface of the container when the reinforcing plate is viewed as a bathtub-shaped container. The opposite surface of the inner surface corresponding to the bathtub bottom surface is a portion corresponding to the outer surface of the bottom surface of the container when the reinforcing plate is viewed as a bathtub-shaped container.

  You may affix the said film on both surfaces of the bathtub bottom face equivalent surface of a metal bathtub-shaped reinforcement board in which the through-hole was formed, and its opposite surface.

  Moreover, the thickness of the film affixed on the inner surface corresponding to the bathtub bottom surface of the metal bathtub-shaped reinforcing plate in which the through hole is formed may be different from the thickness of the film affixed on the opposite surface. Thereby, the bending rigidity with respect to one direction can be strengthened rather than the bending rigidity with respect to an opposite direction.

  Furthermore, the Young's modulus of the film affixed to the inner surface corresponding to the bathtub bottom surface of the metal bathtub-shaped reinforcing plate in which the through hole is formed may be different from the Young's modulus of the film affixed to the opposite surface. Thereby, the bending rigidity with respect to one direction can be strengthened rather than the bending rigidity with respect to an opposite direction.

  Further, the Young's modulus of the film is preferably 1% or more, more preferably 4% or more, or 25% or more of the Young's modulus of the metal bathtub-shaped reinforcing plate in which through holes are formed.

  It is preferable that a flat reinforcing plate is further formed on at least a part of the outer periphery of the metal bathtub-shaped reinforcing plate.

  Moreover, a through-hole can be formed only in the bathtub equivalent surface of a metal bathtub-shaped reinforcement board. “The bathtub equivalent surface” is a portion corresponding to the bottom surface of the container when the reinforcing plate is viewed as a bathtub-shaped container.

  The shape of the through hole can be a square, a circle, or an arbitrary polygon.

  The total area of the through holes with respect to the entire metal bathtub-shaped reinforcing plate can be 50% or more, 60% or more, and further 70% or more in the projected area ratio.

  Several embodiments of a casing structure for a portable electronic device according to the present invention will be described below with reference to the drawings.

(Example 1)
FIG. 1 is an explanatory diagram showing a configuration of a first embodiment of a casing structure of a portable electronic device according to the present invention. Here, FIG. 1A is an exploded perspective view, FIG. 1B is an assembled perspective view, and FIG. 1C is a schematic cross-sectional view taken along the line AA in FIG.

  As shown in FIG. 1A, the housing structure of the portable electronic device according to the first embodiment has a plurality of through holes 105 in the main flat surface portion 102 and the flat surface portions 103 and 104 of the metal bathtub plate 101. As shown in FIG. 1B, the resin film 106 a, 106 b is bonded to the front and back sides of the main flat surface portion 102 of the bathtub plate 101 to form a bathtub plate unit 107. Here, the bathtub plate is a housing plate having a bathtub-like structure in which the outer peripheral portion is raised substantially vertically and has a concave inner surface, and is further flattened from at least one surface of the outer peripheral portion raised substantially vertically. In some cases, the structure may be formed into a reinforcing material. In FIG. 1A, two portions indicated by reference numerals 103 and 104 are the planar structure portions (both have through holes).

  Here, the through hole 105 formed in the main plane portion 102 and the plane portions 103 and 104 of the metal bathtub plate 101 has a structure in which squares are aligned vertically and horizontally in the first embodiment. Depending on the product specifications, it is not always necessary to have a square shape, and any polygonal shape or arc shape can be used.

  With reference to FIGS. 2, 3, 4, and 5, the structure and manufacturing method of Embodiment 1 of the housing structure of the portable electronic device according to the present invention and the features thereof will be described in detail.

  FIG. 2 is a perspective view showing a first manufacturing process of the casing structure of the portable electronic device according to the present invention. First, a flat plate 201 made of stainless steel having a thickness of 0.5 mm was prepared (FIG. 2A), and the shape and position corresponding to the external dimensions of the LCD panel were 102 mm long × 162.4 mm wide and 2.5 mm thick. The bathtub-shaped concave portion 202 is simultaneously formed by pressing so that the four outermost end portions of the flat plate 201 have a height of 3.0 mm and the outer ridge dimension is 111 mm long × 227 mm wide to form the bathtub plate 101. (FIG. 2B). FIG. 2D is a schematic cross-sectional view taken along the line BB in FIG.

  Next, the main plane part 102 and the plane parts 103 and 104 of the bathtub plate 101 have through holes 105 of 9 mm in length and 9 mm in width at a pitch of 10 mm in the main plane part 102 at 160 locations, the plane section 103 at 30 locations, and the plane sections. 104 was created by punching 30 locations in total, 220 locations (FIG. 2 (c)). This is about 71% in terms of the projected area ratio. The main plane portion 102 is a portion corresponding to the bathtub bottom surface of the bathtub-shaped recess 202, and is hereinafter also referred to as “bathtub bottom surface”.

  FIG. 3 is a perspective view showing a second manufacturing process of the casing structure of the portable electronic device according to the present invention. That is, films 106a and 106b having a length of 100 mm × width of 160.4 mm and a thickness of 0.05 mm are formed using a polymer resin material, here, a polyimide material (FIG. 3A), and the film 106a is equivalent to the bottom of the bathtub. Of the surface 102, the inner surface 102 a corresponding to the bottom surface of the bathtub bottom surface (hereinafter referred to as “main plane portion 102 a”) corresponding to the inner side when viewed as a bathtub, and the outer surface of the surface 102 corresponding to the bathtub bottom surface when viewed as a bathtub. The adhesive layer 102b (hereinafter referred to as "main plane portion 102b") corresponding to the inner surface corresponding to the bathtub bottom surface is previously applied to each surface corresponding to both main plane portions 102a and 102b of the films 106a and 106b. The bathtub plate unit 107 was formed by bonding through layers (not shown) (FIG. 3B). FIG.3 (c) is CC schematic cross-sectional view of FIG.3 (b).

  Finally, FIG. 4 is a perspective view showing a third manufacturing process of the casing structure of the portable electronic device according to the present invention. The LCD panel 403 is inserted into the concave portion 405 of the bathtub plate unit 107, and from both sides, the four end sides of a thickness of 0.8 mm using polycarbonate as a base material are bent substantially at right angles in the same direction to form a box shape. The bezel plate 402 on which the window 401 corresponding to the LCD panel 403 is formed and the four sides of the 0.8 mm-thick polycarbonate base material are bent at substantially right angles in the same direction to form a box shape. The bathtub plate unit 107 with the LCD panel 403 inserted in the recess 405 is sandwiched between the top plate 404 and the LCD case structure 406 (FIGS. 4A and 4B).

Here, assuming that the density of the stainless steel as the main raw material of the bathtub plate 101 is 8000 kg / m ³ and the Young's modulus is 197 GPa, the weight of the bathtub plate 101 before the through hole 105 is provided is about 113 g. Since the total weight of the notebook PC is about 1 kg to 1.5 kg, a weight increase of about 113 g occupies about 10% of the total weight and cannot be ignored.

  As in the first embodiment, the through holes 105 are formed in the bathtub plate 101 at a pitch of 10 mm at 160 locations in the main plane portion 102, 30 locations in the plane portion 103, 30 locations in the plane portion 104, and a total of 220 locations. When prepared, the weight after drilling is about 41 g, which has an effect of reducing the weight by about 64%, but the problem that the bending rigidity is reduced by about 82% remains.

Therefore, in Example 1, films 106a and 106b using a polymer resin material, here a polyimide material having a density of 1430 kg / m ³ and a Young's modulus of 3.63 GPa, are bonded to the main flat portions 102a and 102b of the bathtub plate 101. A bathtub plate unit 107 was formed by bonding through layers (not shown). As a result, the weight of the bathtub plate unit 107 is about 44 g which is an increase of about 3 g of the films 106a and 106b and the adhesive layer, and the weight reduction effect is maintained at a high rate of about 61%, and the bending rigidity is 35%. It is possible to keep the decrease, and there is an effect of improving the decrease in the bending rigidity of the bathtub plate unit 107 by 47%.

That is, films 106 a and 106 b using a polymer resin material, here a polyimide material having a density of 1430 kg / m ³ and a Young's modulus of 3.63 GPa, are bonded to the main flat portions 102 a and 102 b of the bathtub plate 101 and an adhesive layer (not shown). With the bathtub plate unit 107 bonded via the LCD panel 403, the LCD panel 403 can be protected from static load resistance against surface pressure.

  Furthermore, since the damping coefficient inherent to the material of the polyimide material is generally larger than that of the stainless steel material, the residual vibration when the drop impact force is applied is larger than that of the bathtub plate 101 made of the conventional stainless steel material, and vibration is generated. Since it is eliminated at an early stage, it is possible to improve the dynamic load resistance against a drop impact force or the like.

  In other words, not only the notebook PC is thinner and lighter, but also satisfies the static load resistance against surface pressure and the dynamic load resistance against drop impact force. It becomes possible.

  Here, in this embodiment, the stainless steel material is used for the bathtub plate 101. However, the present invention is not limited to this, and an aluminum material, an alloy material using this as a main material, a magnesium material, and this material as a main material. Similar effects can be obtained by using an alloy material, a zinc material, an alloy material using this as a main material, a titanium material, an alloy material using this as a main material, and the like. However, stainless steel is most suitable for maximizing the bending rigidity of the bathtub plate 101.

  FIG. 5 is a graph showing the relationship between the Young's modulus of the film and the bending deformation ratio. In the structure shown in Example 1, the Young's modulus of the films 106a and 106b is 0.0 GPa (no film), 0.073 GPa, 0.91 GPa, 1.8 GPA, 3.63 GPa (this Example 1), 7.26 GPa When the relationship of the bending deformation ratio at the time of static load application when changing to 14.52 GPa, 36.3 GPa, 90.8 GPa, and 181.5 GPa was examined, the bending deformation was determined based on the state without a film. When the Young's modulus is 0.073 GPa, the amount ratio is −3.2%, when the Young's modulus is 0.91 GPa, −15.9%, when the Young's modulus is 1.8 GPa, −20.8%, and Young's modulus is 3.63 GPa. When -25.6%, when Young's modulus is 7.26 GPa -29.8%, when Young's modulus is 14.52 GPa-33.7%, when Young's modulus is 36.3 GPa When the Young's modulus is 90.8 GPa, it is -43.5%, and when the Young's modulus is 181.5 GPa, it is -48.2%. It can be seen that a so-called saturation phenomenon occurs in which the amount of bending deformation does not greatly decrease.

  From this, it can be said that a material having a Young's modulus of 1.8 GPa or more sufficiently satisfies the requirements when it is assumed that the bending deformation reduction rate is 20% or more. Further, the Young's modulus required for securing the bending deformation reduction rate of 30% or more is about 7 GPa or more, and if the reduction rate is 40% or more, the Young's modulus may be about 50 GPa or more.

  In general, in order to secure a bending deformation reduction rate of 20% or more, the Young's modulus of the films 106a and 106b may be 1% or more of the Young's modulus of the bathtub plate 101. Similarly, when securing the bending deformation reduction rate of 30% or more, the Young's modulus of the films 106a and 106b is about 4% or more of the Young's modulus of the bathtub plate 101, and about 25% if the reduction rate is 40% or more. That is all.

  That is, in Example 1, a polyimide material having a Young's modulus of 3.63 GPa is used for the films 106a and 106b. However, the present invention is not limited to this, and it can be understood that the Young's modulus may be 1.8 GPa or more. . However, it is obvious that the films 106a and 106b need to be made of a material having a lower density than the material used for the bathtub plate 101 (FIG. 5).

  In the first embodiment, the LCD panel 403 is inserted into the recess 405 of the bathtub plate unit 107. However, the present invention is not limited to this, and the same effect can be obtained when a keyboard is inserted.

  In the first embodiment, the material of the bezel plate 402 and the top plate 404 is made of polycarbonate as a base material. However, the material is not limited to this. It is also possible to use an alloy material that is a main material, a magnesium material and an alloy material that uses this as a main material, a zinc material and an alloy material that uses this as a main material, a titanium material and an alloy material that uses this as a main material, etc. However, in order to achieve the most effective combination of thinning and weight reduction and robustness, which are the greatest effects of this structure, PMMA, PS, ABS, PA, PVC, PPS, PBT, ROA, and these It is preferable to use a synthetic resin material containing as a main component.

  In the first embodiment, the films 106a and 106b are both formed with the same thickness of 0.05 mm. However, the present invention is not limited to this, and the films 106a and 106b can be configured to be thicker or thinner. . The thicknesses of the films 106a and 106b may be different. At this time, for example, when the film 106a is made thicker than the film 106b, the bathtub plate unit 107 specialized for the robustness when a load in a direction in which the main flat surface portion 102a is convex is applied, and when the film 106b is made thicker than the film 106a, The bathtub plate unit 107 specializes in robustness when a load in a direction in which the flat portion 102b is convex is applied. That is, it is possible to arbitrarily select a direction in which the bending rigidity of the bathtub plate unit 107 is desired to be strengthened by arbitrarily selecting the thickness of the films 106a and 106b.

  In the first embodiment, the films 106a and 106b are made of the same material. However, the present invention is not limited to this, and the materials of the films 106a and 106b may be different. At this time, for example, when the Young's modulus of the film 106a is made higher than the Young's modulus of the film 106b, the bathtub plate unit 107 specialized in the robustness when a load in a direction in which the main plane portion 102a is convex is applied. When the Young's modulus is made higher than the Young's modulus of the film 106a, the bathtub plate unit 107 specialized in the robustness when a load in the direction in which the main flat surface portion 102b is convex is applied. That is, by arbitrarily selecting the Young's modulus of the films 106a and 106b, it is possible to arbitrarily select the direction in which the bending rigidity of the bathtub plate unit 107 is desired to be strengthened.

(Example 2)
With reference to FIG. 6, a second embodiment of the casing structure of the portable electronic device according to the present invention will be described in detail. Here, FIG. 6C is a schematic cross-sectional view taken along the line DD in FIG.

  The difference from the first embodiment is that the film 106 a is adhered only to the main flat surface portion 102 a of the bathtub plate 101.

  As in Example 1 (FIG. 2), first, a stainless steel flat plate 201 having a thickness of 0.5 mm is prepared, and the outer dimensions of the LCD panel 403 are 102 mm long × 162.4 mm wide and 2.5 mm thick. The recess 202 is formed in a corresponding shape and position, and at the same time, the outermost peripheral end portion of the flat plate 201 is molded by a press so that the height is 3.0 mm and the outer ridge is 111 mm long × 227 mm wide. It was created.

  Next, through-holes 105 of 9 mm in length and 9 mm in width are formed in the bathtub bottom surface equivalent surface 102 and the plane portions 103 and 104 of the bathtub plate 101 at a pitch of 10 mm in the main plane portion 102 and in the plane portion 103 at 30 locations. The portion 104 was created by punching 30 locations in total, 220 locations. This is about 71% in terms of the projected area ratio.

  Next, a film 106 a having a length of 100 mm × width of 160.4 mm and a thickness of 0.05 mm is prepared using a polymer resin material, here a polyimide material, and the film 106 a is preliminarily formed on the main plane portion 102 a of the bathtub plate 101. The bathtub plate unit 107 was prepared by bonding through an adhesive layer (not shown) applied to the surface corresponding to the main flat surface portion 102a of the bathtub plate 101 of 106a.

  Since the casing structure of the portable electronic device according to the second embodiment uses only one film 106a as compared with the first embodiment, the material cost and the manufacturing process cost can be reduced, and the weight can be further reduced. Excellent in terms of effect. Here, since the films 106a and 106b are not bonded to both surfaces of the main plane portions 102a and 102b of the bathtub plate 101 as in the first embodiment, but only the main plane portion 102a is bonded, the main plane portion 102a becomes convex. The bathtub plate unit 107 specializes in robustness when a load in the direction is applied. However, particularly when applied to a notebook PC, the LCD exposed from the window 401 formed on the bezel plate 402 Generally, a structure such as a keyboard (not shown) exists in the vicinity of the panel 403. When a static load from the direction of the main plane portion 102b of the bathtub plate 101 is applied, the LCD panel 403 and the keyboard are arranged. It is necessary to reduce the contact with a structure such as (not shown), and it is suitable for static load application from the direction of the main plane portion 102b of the bathtub plate 101. Since the bending rigidity of the bathtub plate unit 107 is not necessarily constant, the same is true even when the bending rigidity in the direction in which the main flat surface portion 102a is convex as in the second embodiment is large. Exerts a positive effect. Further, depending on the specifications of the apparatus to be applied, the bathtub plate unit 107 specialized for solidification is used when the film 106b is adhered only to the main plane portion 102b and a load in a direction in which the main plane portion 102b is convex is applied. It is also possible. Since other structures and effects are the same as those of the first embodiment, description thereof is omitted.

(Example 3)
A third embodiment of the casing structure of the portable electronic device according to the present invention will be described in detail with reference to FIG.

  The difference from Example 1 and Example 2 is that the through hole 105 of the bathtub plate 101 is formed only on the bathtub bottom surface 102.

  As in Example 1 (FIG. 2), first, a stainless steel flat plate 201 having a thickness of 0.5 mm is prepared, and the outer dimensions of the LCD panel 403 are 102 mm long × 162.4 mm wide and 2.5 mm thick. The recess 202 is formed in a corresponding shape and position, and at the same time, the outermost peripheral end portion of the flat plate 201 is molded by a press so that the height is 3.0 mm and the outer ridge is 111 mm long × 227 mm wide. It was created.

  Next, through holes 105 having a length of 9 mm and a width of 9 mm were formed only in the bathtub bottom surface 102 of the bathtub plate 101 by punching at 160 locations at a pitch of 10 mm. This is about 51% in terms of the projected area ratio. Since the subsequent manufacturing process, construction method, and structure are the same as those in the first and second embodiments, description thereof will be omitted.

  When the area of the flat portions 103 and 104 of the bathtub plate 101 is larger than the area of the bathtub equivalent surface 102, the casing structure of the portable electronic device according to the third embodiment is larger than the first and second embodiments. There exists an effect which can suppress the bending rigidity fall by the through-hole formation to the plane parts 103 and 104 of the plate 101. FIG. Since other structures and effects are the same as those in the first and second embodiments, description thereof is omitted.

  Although not shown, it is also conceivable to provide a through hole in only one of the plane portions 103 and 104. In this case, the projected area ratio of the opening (through hole) is about 60%, and the opening area ratio and strength are intermediate between those in the first and third embodiments, and this ratio depends on the member to be mounted and the required degree of reinforcement. Such a free selection is possible.

  Although various embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that more modifications can be made without departing from the spirit of the invention. It is.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view, an assembled perspective view, and a schematic cross-sectional view of an embodiment of a casing structure of a portable electronic device according to the present invention. It is a perspective view which shows the 1st manufacturing process of one Example of the housing structure of the portable electronic device which concerns on this invention. It is a perspective view which shows the 2nd manufacturing process of one Example of the housing structure of the portable electronic device which concerns on this invention. It is a perspective view which shows the 3rd manufacturing process of one Example of the housing structure of the portable electronic device by this invention. It is a graph which shows the relationship between the Young's modulus of a film, and a bending deformation amount ratio. 1 is an assembled perspective view of a housing structure of a portable electronic device according to an embodiment of the present invention, and a schematic cross-sectional view. It is a perspective view of one Example of the housing structure of a portable electronic device according to the present invention.

Explanation of symbols

101: Bathtub plate 102: Equivalent surface of the bottom of the bathtub (main plane)
102a: Bathtub bottom equivalent inner surface (main plane part)
102b: Opposite surface (main plane portion) corresponding to the inner surface of the bathtub bottom
103, 104: Plane portion 105: Through holes 106a, 106b: Film
107: Bathtub plate unit 201: Flat plate 202, 405: Concave portion 401: Window portion 402: Bezel plate 403: LCD panel 404: Top plate 406: LCD housing structure

Claims (9)

A casing structure of a portable electronic device including a metal bathtub-shaped reinforcing plate having a bathtub-like shape whose outer periphery is raised substantially vertically,
A through hole is formed in the metal bathtub-shaped reinforcing plate, and a film made of a resin material is attached to at least a part of one side or both sides of the metal bathtub-shaped reinforcing plate in which the through hole is formed. A housing structure.   2. The housing structure according to claim 1, wherein the film is affixed to either an inner surface equivalent to a bathtub bottom surface of the metal bathtub-shaped reinforcing plate in which the through hole is formed or an opposite surface thereof. .   2. The housing structure according to claim 1, wherein the film is affixed to both an inner surface corresponding to a bathtub bottom surface of the metal bathtub-shaped reinforcing plate in which the through hole is formed and the opposite surface thereof.   The thickness of the film to be applied to the inner surface corresponding to the bottom surface of the bathtub of the metal bathtub-shaped reinforcing plate in which the through hole is formed is different from the thickness of the film to be applied to the opposite surface. Item 4. The casing structure according to Item 3.   The Young's modulus of the film to be attached to the inner surface corresponding to the bathtub bottom surface of the metal bathtub-shaped reinforcing plate in which the through hole is formed is different from the Young's modulus of the film to be attached to the opposite surface. The housing structure according to claim 3 or 4.   The housing structure according to claim 1, wherein the Young's modulus of the film is 1% or more of the Young's modulus of the metal bathtub-shaped reinforcing plate in which the through hole is formed. body.   The casing structure according to any one of claims 1 to 6, wherein the through hole is formed only on a surface corresponding to a bathtub bottom surface of the metal bathtub-shaped reinforcing plate.   The casing structure according to any one of claims 1 to 7, wherein the shape of the through hole is a square, a circle, or an arbitrary polygon.   The portable electronic device containing the housing structure as described in any one of Claims 1-8.

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