JP4257233B2 - Housing structure with compressed wood - Google Patents

Description

  The present invention relates to a housing structure using compressed wood, and in particular, is configured by combining a plurality of compressed wood with each other, and holds electronic devices and other arbitrary objects between these compressed woods. The present invention relates to a casing structure made of compressed wood that forms a holding space for the purpose.

  Conventionally, light metal (for example, aluminum, stainless steel, titanium, magnesium) and synthetic resin (for example, ABS, polycarbonate, acrylic) are mainly used as a material for a housing of an electronic device (for example, a digital camera, a mobile phone, an IC recorder). It was used for. A casing formed of such a material has a relatively small expansion / contraction rate due to moisture absorption and desorption, and is isotropic, so that the expansion / contraction rate is substantially uniform in each direction. However, when such a casing is evaluated as an exterior material, there is almost no individual difference because there is almost no individual difference, and there is a drawback that the design is impaired by causing scratches or discoloration during long-term use.

  Therefore, the inventor of the present application has focused on constructing the casing using wood. This is because wood has various grain, so that it can give an appropriate individual difference, and even when used for a long period of time, the color of the surface can be changed to improve the design. Because. Thus, when using wood as a housing | casing, it is possible that housing | casing rigidity falls compared with the case where a light metal and a synthetic resin are utilized. Although it is conceivable to increase the thickness of the casing in order to compensate for this decrease in rigidity, it is not suitable for a casing of an electronic device that is particularly required to be downsized.

  Here, conventionally, a processing method for increasing the strength of the wood by compressing it has been proposed. In this method, wood is softened by water absorption, compressed in a state of being fixed in a predetermined shape, and sliced in the compression direction to obtain a plate-like primary fixed product. Then, the primary fixed product is molded into a molded product having a predetermined three-dimensional shape while absorbing water by heating, and the final product is formed by fixing the shape of the molded product (for example, see Patent Document 1). Alternatively, a method of compressing and fixing wood in a softened state is known (see, for example, Patent Document 2). Therefore, if these methods are used, there is a possibility that the strength of the wood can be improved without causing the problem of increasing the thickness.

Japanese Patent No. 3078452 JP-A-11-77619

  However, when the casing is made of compressed wood, new problems other than rigidity can occur. That is, wood has a very small coefficient of thermal expansion, but has a large expansion / contraction rate due to moisture absorption or desorption, and causes expansion / contraction of up to about 10%. Moreover, since wood has anisotropy, its expansion and contraction is not uniform in each direction. Furthermore, the expansion / contraction rate of compressed wood may be greater than that of uncompressed wood.

  Here, many housings of electronic devices are configured by joining a plurality of exterior materials to each other. Therefore, when each exterior material greatly expands or contracts due to moisture absorption or desorption, the mutual position of each exterior material causes a shift, resulting in a loss of design, a gap in the housing, or excessive stress due to expansion or contraction. By joining the joint, there is a possibility that the joint will crack.

  In addition, when an electronic device has a high-voltage part (for example, a strobe of a digital camera), it may be difficult to insulate the high-voltage part from the outside of the device. In particular, when there is a gap in the housing, the creepage distance between the high voltage part and the outside of the equipment (the shortest distance along the surface of the insulator between the two conductive parts) is shortened. It may be difficult to secure a predetermined creepage distance, which is not preferable.

  The present invention has been made in view of the above, and an object of the present invention is to provide a compressed wood casing structure that can maintain an appropriate casing structure even when the compressed wood is stretched. Yes.

In order to solve the above-described problems and achieve the object, the present invention according to claim 1 is configured by using a pair of compressed wood, and a housing space in which a holding space for holding a predetermined holding object is formed. Each of the pair of compressed timbers is compressed in the thickness direction, and is formed on each of a main surface portion formed in a substantially rectangular shape and four peripheral edges of the main surface portion. A side surface portion that is formed in a non-parallel and integral manner with respect to the main surface portion , and at least some of the wood fibers are continuous with the wood fibers of the main surface portion, and the wood of each main surface portion of the pair of compressed wood the fiber direction, and substantially symmetrical with respect to each other of the opposing surfaces of the pair of compressed wood, it combines with each other the pair of compressed wood, characterized by.

The present invention described in claim 2 is characterized in that, in the present invention described in claim 1, the wood fiber direction of the main surface portion is substantially parallel to the longitudinal direction of the main surface portion .

The present invention described in claim 3 is characterized in that, in the present invention described in claim 1 or 2, the grain of the main surface portion is substantially symmetrical with respect to the mutually facing surfaces of the compressed wood. .

According to a fourth aspect of the present invention, in the present invention according to any one of the first to third aspects, the wood fiber direction of each side surface portion of the pair of compressed wood is substantially the same as the facing surface. It is characterized by being symmetrical .

  According to a fifth aspect of the present invention, in the present invention according to any one of the first to fourth aspects, a part of the compressed wood is an attachment / detachment portion configured to be detachable from the compressed wood. The wood fiber direction of the attaching / detaching portion is substantially the same as the wood fiber direction of the compressed wood to which the attaching / detaching portion attaches / detaches.

According to the case structure of the compressed wood according to the present invention, even when the pair of compressed woods are stretched, the wood fiber directions of the main surface portions thereof are substantially symmetrical with respect to the mutually facing surfaces of the compressed wood. and for which can be maintained mutually equal lengths a pair of compressed wood, it is possible to maintain these relative positional relationships, it is possible to prevent the positional deviation or the like of each other of the pair of compressed wood.

Further, according to the case structure of the compressed wood according to the present invention, because the wood fiber direction of the compressed wood is substantially parallel to the longitudinal direction of the main surface portion, the wood fiber direction with the least expansion and contraction in the compressed wood, It is possible to match the longitudinal direction which has the greatest influence of expansion and contraction among the casings, and to more effectively prevent misalignment of compressed wood.

Further, according to the case structure of the compressed wood according to the present invention, the compressed wood becomes substantially symmetrical with respect to the grain, so that the relative positional relationship of the compressed wood can be more effectively maintained and the design properties can be further improved. Can do.

In addition, according to the case structure of the compressed wood according to the present invention , even when the compressed wood expands and contracts, the attachable / detachable portion expands and contracts at substantially the same expansion rate as that of the compressed wood. The relative positional relationship with can be maintained.

  Hereinafter, embodiments of a casing structure using compressed wood according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by these each Example.

  Initially, Example 1 of the housing | casing structure by the compressed wood which concerns on this invention is demonstrated. The casing structure according to the first embodiment is roughly as follows: (1) Each compressed wood is formed on a main surface portion formed in a substantially rectangular shape and each of the four peripheral edges of the main surface portion. Each of the plurality of (a pair of) compressed woods with respect to the direction of the wood fibers, and the plurality of the compressed woods facing each other. And (2) the wood fiber direction of the main surface portion is made substantially parallel to the longitudinal direction of the main surface portion.

[Outline of electronic equipment]
FIG. 1 is a perspective view of an electronic device using a casing structure made of compressed wood according to the first embodiment. In FIG. 1, an electronic device 1 is a digital camera and includes a housing 10 and an electronic unit 20. The housing 10 accommodates the electronic unit 20 as a holding target in a holding space formed therein, and holds the electronic unit 20 integrally and protects it from the outside of the housing. Furthermore, the housing 10 also functions as an exterior material for the electronic device 1 by exposing the outer surface thereof to the outside.

  On the other hand, the electronic unit 20 achieves a required electronic function of the electronic device 1, and includes, for example, an imaging lens 21, a shutter button 22, a liquid crystal monitor, an imaging device, driving circuits for various devices, and connection terminals to external devices. Etc. are provided. FIG. 1 shows only the imaging lens 21 and the shutter button 22 in the electronic unit 20.

  In the following description, as indicated by an arrow in FIG. 1, the direction X along the length of the electronic device 1 is the longitudinal direction, and the direction Y along the short side of the electronic device 1 is perpendicular to the longitudinal direction. The thickness direction is a direction Z perpendicular to the short direction, the long direction and the short direction. Further, the longitudinal dimension is defined as the longitudinal dimension, the lateral dimension is defined as the short dimension, and the thickness dimension is defined as the thickness. Further, the wood fiber direction is a direction in which the wood extends in the wood growth process (a direction from the root of the wood toward the tip), and is a direction substantially parallel to the plate face and the face face and substantially orthogonal to the face of the head. Further, the grain is generally a pattern caused by the wood fiber density, but here, the wood fiber density distribution is shown regardless of whether or not it can be visually grasped.

[Case structure]
Next, a specific configuration of the housing 10 will be described. 2 is an exploded perspective view of the electronic device of FIG. 1, FIG. 3 is a cross-sectional view taken along the line AA of the electronic device of FIG. 1, and FIG. 4 is an AA arrow in the stretched state of the electronic device 1 of FIG. FIG. In FIG. 2, the electronic part is omitted. As shown in each of these figures, the housing 10 is configured by combining a plurality of compressed woods. In the first embodiment, the housing 10 is configured by combining a front panel 11 and a rear panel 12 which are a pair of compressed wood.

[Configuration of front panel and rear panel]
The front panel 11 and the rear panel 12 are formed and processed into a shape corresponding to a holding target held inside. That is, one front panel 11 has a lens hole 13 for exposing the imaging lens 21 to the outside, and the other rear panel 12 has a monitor hole 14 for exposing a liquid crystal monitor. Each of the front panel 11 and the rear panel 12 has a shutter hole 15 for exposing the shutter button 22 and a terminal hole 16 for allowing connection of an external device to the connection terminal.

  Each of the front panel 11 and the rear panel 12 includes flat main surface portions 11a and 12a, and side surface portions 11b to 11e and 12b to 12e formed on the peripheral edges of the main surface portions 11a and 12a. The side surface portions 11b to 11e and 12b to 12e are formed on all peripheral edges of the main surface portions 11a and 12a. Here, since the main surface portions 11a and 12a are formed in a square shape and have peripheral edges in the four directions, the side surface portions 11b to 11e and 12b to 12e are formed on each of the four peripheral edges of the main surface portions 11a and 12a.

  Here, the side surface portions 11b to 11e and 12b to 12e are formed non-parallel to the main surface portions 11a and 12a. Specifically, the side surface portions 11b to 11e of the front panel 11 are configured to rise toward the rear panel 12, and the side surface portions 12b to 12e of the rear panel 12 are configured to rise toward the front panel 11. ing. The mutual angle formed by the main surface portions 11a and 12a and the side surface portions 11b to 11e and 12b to 12e can be arbitrarily determined as long as they are non-parallel (other than 0 degrees). In the first embodiment, the side surface portions 11b to 11e and 12b to 12e are substantially orthogonal to the main surface portions 11a and 12a.

  In particular, these side surface portions 11b to 11e and 12b to 12e are formed integrally with the main surface portions 11a and 12a. That is, the side surfaces 11b to 11e and 12b to 12e are configured by continuously and non-parallelly bending the wood fibers contained in the main surface portions 11a and 12a with a press pressure or the like without interruption. In this respect, the housing 10 is essentially different from a conventional wooden box or a canoe formed by cutting.

[Wood fiber direction in front panel and rear panel]
Next, the wood fiber directions of the front panel 11 and the rear panel 12 will be described. When the facing surface P interposed between the front panel 11 and the rear panel 12 is virtually set as shown in FIGS. 3 and 4, the main surface portions 11 a and 12 a and the side surface portion 11 b with respect to the facing surface P. The wood fiber directions of ˜11e and 12b to 12e are substantially symmetrical. Specifically, the wood fiber directions of the main surface portions 11a and 12a and the side surface portions 11b to 11e and 12b to 12e are all along the longitudinal direction.

  In other words, the surfaces facing each other, that is, the main surface portion 11a and the main surface portion 12a, the side surface portion 11b and the side surface portion 12b, the side surface portion 11c and the side surface portion 12c, the side surface portion 11d and the side surface portion 12d, and the side surface portion 11e and the side surface. The part 12e is configured to have wood fibers along substantially the same direction (in FIGS. 3 and 4, the cross sections of the front panel 11 and the rear panel 12 are represented by oblique lines, The slanted line is different from the actual wood fiber and grain (the same applies to FIG. 5 described later). A method of forming the front panel 11 and the rear panel 12 in this way will be described later.

[Reciprocal relationship between expansion and contraction of front panel and rear panel]
Next, the state at the time of expansion / contraction of the housing | casing 10 is demonstrated. As shown in FIG. 3, the longitudinal dimension Lf of the front panel 11 and the longitudinal dimension Lr of the rear panel 12 are substantially the same. Here, it is assumed that the front panel 11 and the rear panel 12 are stretched due to moisture absorption or moisture release. For example, as shown in FIG. 4, the amount of expansion / contraction in the longitudinal direction of the front panel 11 in this expanded / contracted state is ΔLf, and the amount of expansion / contraction in the longitudinal direction of the rear panel 12 is ΔLr.

  In this case, the expansion and contraction in each direction is anisotropic, and the expansion / contraction rate in each direction varies depending on the direction of the wood fiber. Here, as described above, the wood fiber directions of the front panel 11 and the rear panel 12 are substantially symmetric with respect to the opposing surfaces P of the front panel 11 and the rear panel 12. Therefore, the longitudinal expansion amount ΔLf of the front panel 11 is equal to the longitudinal expansion amount ΔLr of the rear panel 12, and as shown in FIG. The longitudinal dimension of the panel 12 is Lr + ΔLr.

  This relationship is the same in the short direction. That is, before stretching, the short dimension of the front panel 11 is the short dimension of the rear panel 12, and after stretching, the short dimension of the front panel 11 after stretching is equal to the rear panel 12 after stretching. Short dimensions.

  Therefore, even when there is expansion and contraction, the front panel 11 and the rear panel 12 can be maintained at the same length, and the relative positional relationship between them can be maintained. 12 can prevent misalignment of each other, maintain design properties, prevent a gap from being generated in the housing 10, and prevent excessive stress due to expansion and contraction from being applied to the joint. The crack of the part can be prevented. Even when the high-voltage part is included in the electronic unit 20, it is possible to prevent a gap from being generated in the housing 10, so that a required creepage distance can be ensured.

  In particular, in the first embodiment, as shown in FIGS. 1 and 2, the wood fiber directions of the main surface portions 11a and 12a are substantially parallel to the longitudinal direction of the main surface portions 11a and 12a. Here, it is generally known that the expansion and contraction of wood is the smallest in the wood fiber direction. Therefore, when the wood fiber direction is substantially parallel to the longitudinal direction as in the first embodiment, the wood fiber direction with the least expansion and contraction in the main surface portions 11a and 12a is the most elastic in the main surface portions 11a and 12a. It is possible to match the longitudinal direction having a great influence, and it is possible to more effectively prevent misalignment between the front panel 11 and the rear panel 12.

[Mutual structure of front panel and rear panel]
Next, the mutual joining structure of the front panel 11 and the rear panel 12 will be described. FIG. 5 is an enlarged cross-sectional view of the joint portion of FIG. 3, and FIG. 6 is a perspective view showing the joint structure. As shown in FIGS. 5 and 6, a handle portion 12 f is formed on the entire surface of the rear panel 12 facing the front panel 11. On the other hand, on the surface of the front panel 11 facing the rear panel 12, a handle hole 11f having a shape corresponding to the handle portion 12f is formed over the entire circumference. The front panel 11 and the rear panel 12 are joined to each other by inserting the handle 12f into the handle hole 11f. Thus, even when a strong joint structure is adopted, the relative positional relationship between these two panels is maintained as described above, so that cracks and the like of the joint portion can be prevented. In addition, the mutual joining structure of the front part panel 11 and the rear part panel 12 is arbitrary, For example, the waterproof structure using a rubber packing is also employable.

[Method for forming front panel and rear panel]
Next, a method for forming the front panel 11 and the rear panel 12 will be described. Since the front panel 11 and the rear panel 12 can be formed in the same manner, a method for forming the front panel 11 will be described below. FIG. 7 is a perspective view illustrating the shaping of the wood according to the first embodiment. As shown in FIG. 7, first, a wood 31 is formed from an uncompressed raw wood 30. Here, the wood 31 is shaped in such a direction that its longitudinal direction is along the wood fiber direction Lw of the raw wood 30. The wood 31 integrally includes a main surface portion 11a and side surface portions 11b to 11e of the front panel 11, and the main surface portion 11a and the side surface portions 11b to 11e are connected via a smooth curved surface. In FIG. 7, the wood grain 30 is shown as 32.

  FIG. 8 is a plan view illustrating the shaping of the wood according to the first embodiment. As shown in FIG. 8, as the timber 31 taken from the raw wood 30, the timber 31-1, the timber 31-2, and the timber 31-3 can be considered according to the position with respect to the grain 32. In the present embodiment, the wood fiber direction is made substantially parallel to the longitudinal direction of the main surface portion 11a as described above by taking the shape like the wood 31-1. However, this wood removal direction can be arbitrarily determined as long as the effects relating to the wood fiber direction specified in this description are exhibited.

  FIG. 9 is a perspective view illustrating a wood compression process according to the first embodiment, and FIGS. 10 to 12 are longitudinal cross-sectional views sequentially illustrating the respective wood compression processes according to the first embodiment. Schematically, as shown in FIG. 9, the wood 31 is pressed between the lower mold frame 40 and the upper mold frame 41, so that the front portion integrally including the main surface portion 11 a and the side surface portions 11 b to 11 e is provided. A panel 11 is formed.

  First, the shape of the wood 31 will be described. The wood 31 is shaped in a form in which a volume that is reduced by compression is added in advance. Specifically, as shown in FIG. 10, the main surface portion 11a has a thickness W1 to which a volume that decreases by compression is added in advance, and the side surface portions 11b to 11e have a thickness that has previously added a volume that decreases by compression. Each is shaped with W2 and height T1. The entire shape is taken with a width H1. Further, the thickness W1 of the main surface portion is formed to be thicker than the thickness W2 of the side surface portion.

  Next, the shape relationship between the wood 31 and the lower mold 40 and the upper mold 41 will be described. As shown in FIGS. 10 to 12, the curvature radius of the curved surface RO on the outer surface of the wood 31 and the curvature radius of the curved surface RA of the recess 40a of the lower mold 40 facing the curved surface RO are in a relationship of RO> RA. is there. On the other hand, the curvature radius of the curved surface RI of the wood 31 and the curvature radius of the curved surface RB of the convex portion 41a of the upper mold frame 41 are in a relationship of RI> RB. Moreover, as shown in FIG. 11, these mutual spaces in a state where the lower mold frame 40 and the upper mold frame 41 are combined form the shape of the front panel 11 after the wood 31 is compressed.

  Next, a specific forming method will be described. First, as shown in FIG. 10, the wood 31 is disposed between the lower mold frame 40 and the upper mold frame 41. At the same time, the wood 31 is placed in a high-temperature and high-pressure steam atmosphere for a predetermined time, so that moisture is excessively absorbed and softened. Next, as shown in FIG. 11, the upper mold 41 is fitted into the lower mold 40 to compress the wood 31. Then, the wood 31 is left for a predetermined time with a compressive force applied. Finally, the high temperature and high pressure steam atmosphere is released, the upper mold 41 is separated from the lower mold 40, and the formed front panel 11 is taken out as shown in FIG. The removed front panel 11 is compressed from the main surface portion 11a to the side surface portions 11b to 11e to substantially uniform thicknesses W1 ′ and W2 ′, and the side surface portions 11b to 11e are compressed to the height T1 ′. Further, the bending portion 1c is compressed in an oblique direction. The front panel 11 is compressed to a width H1 ′ as a whole. Since the front panel 11 thus compression-molded increases the fiber density, high strength is imparted to the whole.

  Next, a second embodiment of the casing structure made of compressed wood according to the present invention will be described. The main feature of the second embodiment is that, in addition to the features of the first embodiment, the grain of the main surface portion is substantially symmetrical with respect to the opposing surfaces of the compressed wood. The structure and method that are not particularly described are the same as those in the first embodiment described above, and the same components are described with the same reference numerals.

[Case structure]
13 is a perspective view of an electronic device using a casing structure made of compressed wood according to the second embodiment, and FIG. 14 is an exploded perspective view of the electronic device of FIG. 13 (the electronic unit is omitted). As shown in each of these drawings, the housing 60 is configured by combining a front panel 61 and a rear panel 62 which are a pair of compressed wood.

[Configuration of front panel and rear panel]
Each of the front panel 61 and the rear panel 62 includes a plate-like main surface portion 61a, 62a and side surface portions 61b-61e, 62b-62e formed non-parallel at the four peripheral edges of the main surface portion 61a, 62a. Is integrated. And each wood fiber direction of main surface part 61a, 62a and side part 61b-61e, 62b-62e is substantially symmetrical with respect to mutual opposing surface P (illustration omitted) of the front panel 61 and the rear panel 62. is there. Therefore, even when there is expansion and contraction, the front panel 61 and the rear panel 62 can be maintained at the same length, and their relative positional relationship can be maintained.

[Position of the grain between the front panel and the rear panel]
In particular, in the second embodiment, the front panel 61 and the rear panel 62 are substantially symmetrical with respect to the mutually facing surfaces P of the front panel 61 and the rear panel 62 with respect to the grain. Is formed. That is, the distribution of the wood fiber density of the front panel 61 and the distribution of the wood fiber density of the rear panel 62 are substantially the same with the opposing surface P in between. This relationship is almost common with respect to the distribution of all the wood fiber densities in the side portions 61b to 61e and 62b to 62e. Therefore, even when the front panel 61 and the rear panel 62 expand and contract, the relative positional relationship can be more effectively maintained. Further, by matching the grain, the front panel 61 and the rear panel 62 have a visually continuous housing structure, and the design can be further improved.

[Method for forming front panel and rear panel]
Next, a method for forming the front panel 61 and the rear panel 62 will be described. FIG. 15 is a perspective view illustrating the shaping of the wood according to the second embodiment. As shown in FIG. 15, the timbers 31 for forming the front panel 61 and the rear panel 62 are respectively shaped at substantially symmetric positions with respect to the center C of the raw wood 30. Then, similarly to the first embodiment, the front panel 61 and the rear panel 62 are formed by compressing the wood 31 in a high-temperature and high-pressure steam atmosphere using the lower mold frame 40 and the upper mold frame 41. Can do. However, the present invention is not limited to this method, and the front panel 61 and the rear panel 62 are formed so as to be substantially symmetrical with respect to the opposing surface P of the front panel 61 and the rear panel 62 with respect to the grain. As long as it is done, it can be formed by any method.

  Next, a third embodiment of the casing structure made of compressed wood according to the present invention will be described. In the third embodiment, in addition to the features of the first and second embodiments, a part of the compressed wood is a detachable portion configured to be detachable from the compressed wood, and the wood fiber direction of the detachable portion is determined. The main feature is that the direction of the wood fiber of the compressed wood to be attached / detached by the attaching / detaching portion is substantially the same. Note that the structure and method that are not particularly described are the same as those in the second embodiment described above, and the same components are described with the same reference numerals.

[Case structure]
FIG. 16 is a perspective view from the rear surface direction of the electronic device using the casing structure made of compressed wood according to the third embodiment, and FIG. 17 is an exploded perspective view of the electronic device with the battery cover removed. As shown in each of these drawings, the housing 70 is configured by combining a front panel 71 and a rear panel 72 that are a pair of compressed wood.

[Configuration of front panel and rear panel]
Each of the front panel 71 and the rear panel 72 includes a flat main surface portion 71a, 72a, and side surface portions 71b-71e, 72b-72e formed non-parallel at the four peripheral edges of the main surface portion 71a, 72a. Is integrated. And each wood fiber direction of main surface part 71a, 72a and side surface part 71b-71e, 72b-72e is substantially symmetrical with respect to mutual opposing surface P (illustration omitted) of the front panel 71 and the rear panel 72. is there. Therefore, even when there is expansion and contraction, the front panel 71 and the rear panel 72 can be maintained at the same length, and the relative positional relationship between them can be maintained.

[Configuration of removable part]
Here, the rear panel 72 is provided with a battery cover 90 as an attaching / detaching portion configured to be attachable / detachable to / from the rear panel 72. The battery cover 90 is formed by cutting a part of the main surface portion 72a of the rear panel 72 into a square shape. The battery cover 90 is detachably attached to the main surface portion 72a by engaging or disengaging the engaging portions 91 provided on both sides thereof with the side edge of the opening 72f of the main surface portion 72a. Yes. As a specific locking structure, a known structure can be adopted. And the battery 92 can be replaced | exchanged in the state which removed the battery cover 90 from the main surface part 72a like FIG.

[Wood fiber direction between rear panel and removable part]
Here, the wood fiber direction of the battery cover 90 is substantially the same as the wood fiber direction of the main surface portion 72a to which the battery cover 90 is attached and detached. That is, as shown in FIG. 16, the battery cover 90 is formed and arranged so that the wood fiber direction of the battery cover 90 is substantially along the longitudinal direction of the main surface portion 72a. Therefore, even when the main surface portion 72a expands / contracts, the battery cover 90 expands / contracts at an expansion / contraction rate substantially the same as the expansion / contraction rate of the main surface portion 72a, so that the relative positional relationship between the main surface portion 72a and the battery cover 90 can be maintained.

  Next, a fourth embodiment of the casing structure made of compressed wood according to the present invention will be described. In the fourth embodiment, as in the third embodiment, the main feature is that the wood fiber direction of the attaching / detaching portion is substantially the same as the wood fiber direction of the compressed wood attached / detached by the attaching / detaching portion. Note that the structure and method that are not particularly described are the same as those in the third embodiment described above, and the same components will be described with the same reference numerals.

[Case structure]
FIG. 18 is a perspective view from the rear surface direction of the electronic device using the casing structure made of compressed wood according to the fourth embodiment, and FIG. 19 is an exploded perspective view of the electronic device with the battery cover removed. As shown in each of these drawings, the housing 80 is configured by combining a front panel 81 and a rear panel 82 which are a pair of compressed wood.

[Configuration of front panel and rear panel]
Each of the front panel 81 and the rear panel 82 includes a flat main surface portion 81a, 82a and side surface portions 81b-81e, 82b-82e formed non-parallel at the four peripheral edges of the main surface portion 81a, 82a. Is integrated. And each wood fiber direction of main surface part 81a, 82a and side surface part 81b-81e, 82b-82e is substantially symmetrical with respect to mutual opposing surface P (illustration omitted) of the front panel 81 and the rear panel 82. is there. Therefore, even when there is expansion and contraction, the front panel 81 and the rear panel 82 can be maintained at the same length, and their relative positional relationship can be maintained.

[Configuration of removable part]
Here, the rear panel 82 is provided with a battery cover 100 as an attaching / detaching portion configured to be attachable / detachable to / from the rear panel 82. The battery cover 100 is formed by dividing one end portion of the rear panel 82. That is, the battery cover 100 includes a main surface portion 82a and side surface portions 82b and 82d of the rear panel 82, and all of the side surface portion 82c.

  Here, a handle 101 is formed on the surface of the front panel 81 facing the battery cover 100, and the surface of the battery cover 100 facing the front panel 81 has a shape corresponding to the handle 101. A handle hole 102 is formed. Then, the battery cover 100 can be attached as shown in FIG. 18 by sliding the battery cover 100 while inserting the handle 101 into the handle hole 102 from the direction indicated by the arrow in FIG. As a specific mounting structure, a known structure can be adopted. Then, the battery 103 can be replaced with the battery cover 100 removed from the rear panel 82 as shown in FIG.

[Wood fiber direction between rear panel and removable part]
Here, the wood fiber direction of the battery cover 100 is substantially the same as the wood fiber direction of the rear panel 82. That is, the battery cover 100 is formed and arranged so that the wood fiber direction of the battery cover 100 is substantially along the longitudinal direction of the rear panel 82. Therefore, even when the rear panel 82 expands and contracts, the battery cover 100 expands and contracts at substantially the same expansion / contraction ratio, so that the relative positional relationship between the rear panel 82 and the battery cover 100 can be maintained.

[Possibility of modification and improvement of embodiments]
Finally, the possibility of changing the above embodiment will be described. That is, the specific configurations and methods in the embodiments according to the present invention described above can be arbitrarily modified and improved within the scope of the technical idea of each invention described in the claims. In addition, the problems to be solved by the invention and the effects of the invention are not limited to the above contents, and the present invention solves the problems not described above or has the effects not described above. There are also cases where only some of the described problems are solved or only some of the described effects are achieved.

  For example, the electronic device is not limited to the digital camera, and may be configured as a mobile phone, an IC recorder, a PDA, a mobile TV, a mobile radio, a remote controller for various home appliances, and the like. In the above description, the structure described as substantially parallel or substantially orthogonal means not strictly parallel or orthogonal but also includes non-parallel or non-orthogonal to the extent that the function of the present invention can be achieved. In particular, since the structure is made of wood, which is a natural material, at least an error that can occur in normal wood processing is acceptable. Moreover, the dimension and ratio of each part demonstrated in each Example are only an example to the last, and these each part can be formed by the arbitrary dimensions and ratios different from the above.

  Moreover, the number of components of compressed wood is arbitrary, for example, 2-4 compressed wood can be combined mutually. Moreover, the shape of the compressed wood and the shape of the casing configured by combining the compressed wood are arbitrary. For example, the casing may be configured in a cylindrical shape or an egg shape. Moreover, the formation method of wood compression is not limited to the method demonstrated above, For example, you may perform compression simultaneously with raising a side part by pressing the wood cut out in flat form with a mold. Or the compression direction with respect to a timber can also be made into directions other than having demonstrated, and compression can also be performed from several compression directions.

  Further, the compressed wood may be directly combined with each other or indirectly combined to constitute the casing. For example, you may combine a some compressed wood through another member made from a metal or resin. Moreover, the attaching / detaching part provided detachably on the compressed wood is not limited to the battery cover as in the third and fourth embodiments, and can be configured as an attaching / detaching part for performing an arbitrary function.

1 is a perspective view of an electronic device using a casing structure made of compressed wood according to Example 1. FIG. It is a disassembled perspective view of the electronic device of FIG. It is AA arrow sectional drawing of the electronic device of FIG. It is an AA arrow sectional view in the expansion-contraction state of the electronic device 1 of FIG. FIG. 4 is an enlarged cross-sectional view of a joint portion of FIG. It is a perspective view which shows a joining structure. It is a perspective view which shows the shaping of the wood which concerns on Example 1. FIG. It is a top view which shows the shaping of the wood which concerns on Example 1. FIG. It is a perspective view which shows the compression process of the timber which concerns on Example 1. FIG. It is a longitudinal cross-sectional view which shows each compression process of the wood which concerns on Example 1 one by one. It is a longitudinal cross-sectional view which shows each compression process of the wood which concerns on Example 1 one by one. It is a longitudinal cross-sectional view which shows each compression process of the wood which concerns on Example 1 one by one. It is a perspective view of the electronic device using the housing | casing structure by the compressed wood which concerns on Example 2. FIG. It is a disassembled perspective view of the electronic device of FIG. It is a perspective view which shows the shaping of the wood which concerns on Example 2. FIG. It is a perspective view from the rear surface direction of the electronic device using the housing | casing structure by the compressed wood which concerns on Example 3. FIG. It is a disassembled perspective view of the electronic device in the state which removed the battery cover. It is a perspective view from the rear surface direction of the electronic device using the housing | casing structure by the compressed wood which concerns on Example 4. FIG. It is a disassembled perspective view of the electronic device in the state which removed the battery cover.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electronic device 10, 60, 70, 80 Case 11, 61, 71, 81 Front panel 11a, 12a, 61a, 62a, 71a, 72a, 81a, 82a Main surface part 11b-11e, 12b-12e, 61b-61e , 62b to 62e, 71b to 71e, 72b to 72e, 81b to 81e, 82b to 82e Side surface portion 11f, 102 Handle hole 12, 62, 72, 82 Rear panel 12f, 101 Handle portion 13 Lens hole 14 Monitor hole 15 Shutter hole 16 Terminal hole 20 Electronic part 21 Image pickup lens 22 Shutter button 30 Raw wood 31 Wood 32 Wood grain 40 Lower mold frame 40a Concave part 41 Upper mold frame 41a Convex part 72f Opening part 90, 100 Battery cover 91 Locking part 92, 103 Battery

Claims (5)

It is configured using a pair of compressed wood , a housing structure in which a holding space for holding a predetermined holding object is formed ,
Each of the pair of compressed woods is compressed in the thickness direction, and is formed on each of the main surface portion formed in a substantially rectangular shape and the four peripheral edges of the main surface portion, with respect to the main surface portion. A non-parallel and integrally formed , and at least a portion of the wood fiber is continuous with the wood fiber of the main surface portion ,
The wood fiber direction of the main surface portion of each of the pair of compressed wood that was substantially symmetrical with respect to each other of the opposing surfaces of the pair of compressed wood, combined with each other the pair of compressed wood,
A casing structure made of compressed wood. The wood fiber direction of the main surface portion is substantially parallel to the longitudinal direction of the main surface portion,
The casing structure by the compressed wood according to claim 1 . The grain of the main surface portion is substantially symmetrical with respect to the mutually facing surfaces of the compressed wood,
A casing structure made of compressed wood according to claim 1 or 2. The wood fiber direction of each side surface portion of the pair of compressed wood is substantially symmetrical with respect to the facing surface,
The casing structure by the compressed wood according to any one of claims 1 to 3. A part of the compressed wood is an attaching / detaching portion configured to be attachable / detachable to / from the compressed wood,
The wood fiber direction of the attachment / detachment part is substantially the same as the wood fiber direction of the compressed wood that the attachment / detachment part attaches / detaches,
The casing structure by the compressed wood according to any one of claims 1 to 4.

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