Exterior parts, housing, and watch

Abstract

The present invention provides an exterior component, characterized in that it comprises: a first fiber-reinforced resin body, which is stacked with a plurality of first fiber-reinforced resin sheets; and a second fiber-reinforced resin body, which is stacked with a plurality of second fiber-reinforced resin sheets, wherein the first fiber-reinforced resin sheets of the first fiber-reinforced resin body are stacked obliquely relative to the second fiber-reinforced resin sheets of the second fiber-reinforced resin body.

Description

Technical Field

[0001] The technical field of the present invention relates to exterior components used in electronic devices such as wristwatches and portable information terminals, cases including the exterior components, and timepieces including the exterior components. Background Art

[0002] In the exterior parts of watches, as described in Japanese Patent Application Publication No. 2005-114495, there is known a structure in which carbon fibers are used as a reinforcing material, the carbon fibers are stacked in the front and back directions to form a carbon fiber reinforced resin sheet, and a thermosetting resin is provided on the front and back sides of the carbon fiber reinforced resin sheet.

[0003] In such an exterior component of a watch, since a thermosetting resin is provided on the front and back sides of a carbon fiber reinforced resin sheet formed by stacking carbon fibers in the front and back directions, even if weight reduction can be achieved, there is a problem that sufficient strength cannot be obtained and impact resistance cannot be ensured. Summary of the invention

[0004] An object of the present invention is to provide an exterior component capable of improving strength and impact resistance, a case including the exterior component, and a timepiece including the exterior component.

[0005] One of the methods is an exterior component, characterized in that it comprises: a first fiber-reinforced resin body, which is stacked with a plurality of first fiber-reinforced resin sheets; and a second fiber-reinforced resin body, which is stacked with a plurality of second fiber-reinforced resin sheets, wherein the first fiber-reinforced resin sheets of the first fiber-reinforced resin body are stacked obliquely relative to the second fiber-reinforced resin sheets of the second fiber-reinforced resin body. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is an enlarged perspective view showing one embodiment of a wristwatch.

[0007] Figure 2 yes Figure 1 An enlarged cross-sectional view of the main parts of the watch shown as viewed along arrow AA.

[0008] Figure 3 Yes means Figure 1 An enlarged perspective view of a second exterior component of the watch shown.

[0009] Figure 4 Yes Figure 3 The second exterior member shown is an enlarged perspective view of a main portion thereof, which is cut away along the line BB.

[0010] Figure 5 Yes means Figure 3An enlarged perspective view of a pattern of a glass fiber layer in a first fiber-reinforced resin body of a second exterior component is shown. DETAILED DESCRIPTION

[0011] Below, refer to Figures 1 to 5 , an implementation method applied to a wristwatch is described.

[0012] like Figure 1 As shown, the watch comprises a watch case 1. Band attachment portions 2 for attaching a watch band (not shown) are provided on the 12 o'clock side and the 6 o'clock side of the watch case 1, respectively.

[0013] At the 2 o'clock side, 3 o'clock side, 4 o'clock side, 8 o'clock side, and 10 o'clock side of the watch case 1, Figure 1 As shown, switch buttons 3 are provided respectively. Figure 2 As shown, a watch glass 4 is mounted via a gasket 4a at the upper opening of the watch case 1. A watch module (not shown) is provided inside the watch case 1.

[0014] like Figure 1 as well as Figure 2 As shown, the watch case 1 includes a case body 5 and an exterior member 6. The case body 5 includes an outer case 7 and an inner case 8. The outer case 7 is formed into a substantially ring shape from a metal such as stainless steel. A band mounting portion 2 is provided at the 12 o'clock side and the 6 o'clock side of the outer case 7. The inner case 8 is formed into a substantially cylindrical shape having a bottom 8a corresponding to the back cover from a hard synthetic resin.

[0015] In this case, if Figure 2 As shown in the figure, the outer diameter of the inner housing 8 is formed to be substantially the same as the inner diameter of the outer housing 7, and the length in the vertical direction is formed to be longer than the length in the vertical direction of the outer housing 7. A convex portion 8b is provided on the side wall portion of the inner housing 8. The convex portion 8b is configured so that when the inner housing 8 is arranged in the outer housing 7, the convex portion 8b is inserted and engaged with the concave portion 7a provided on the inner wall portion of the outer housing 7, so that the inner housing 8 does not slip out to the lower side of the outer housing 7.

[0016] like Figure 1 and Figure 2 As shown, the outer casing 6 includes a first outer casing 10 and a second outer casing 11. The first outer casing 10 is formed as a whole into a substantially ring shape by a metal such as stainless steel. The first outer casing 10 includes: an annular plate portion 10a, which is arranged across the upper end surface of the outer case 7 and the upper end surface of the inner case 8; and a cylindrical portion 10b, which is provided on the inner periphery of the plate portion 10a and has the watch glass 4 embedded therein via a gasket 4a.

[0017] In this case, if Figure 2As shown, a waterproof ring 9 is provided between the lower surface of the plate portion 10a of the first exterior member 10 and the upper end surface of the inner housing 8. In addition, a restriction portion 10c that abuts against the inner circumferential surface of the inner housing 8 is provided at the inner peripheral end of the plate portion 10a of the first exterior member 10. Thus, the first exterior member 10 is configured such that when the plate portion 10a is arranged across the upper end surface of the outer housing 7 and the upper end surface of the inner housing 8 via the waterproof ring 9, the restriction portion 10c abuts against the inner circumferential surface of the inner housing 8 to restrict the radial position of the first exterior member 10.

[0018] like Figure 1 and Figure 2 As shown, the second exterior member 11 is formed into a substantially annular shape by a fiber material described later, and is arranged on the plate portion 10a of the first exterior member 10. That is, the inner diameter of the second exterior member 11 is formed to be the same size as the outer diameter of the cylindrical portion 10b of the first exterior member 10, and the outer diameter of the second exterior member 11 is formed to be substantially the same size as the outer diameter of the plate portion 10a of the first exterior member 10.

[0019] In addition, if Figure 2 As shown, the length (thickness) of the second exterior member 11 in the vertical direction is formed to be slightly shorter (lower) than the length of the cylindrical portion 10b of the first exterior member 10 in the vertical direction. Thus, the second exterior member 11 is arranged on the plate portion 10a of the first exterior member 10 in a state where its upper surface is slightly lower than the upper end of the cylindrical portion 10b of the first exterior member 10. Therefore, the first exterior member 10 is configured so that the upper end of the cylindrical portion 10b receives the impact from above, and the upper surface of the second exterior member 11 does not receive the impact from above.

[0020] like Figure 2 As shown, the second exterior member 11 is configured to be mounted on the case body 5 together with the first exterior member 10 by a plurality of screw members 12 as a fastening member described later in a state where the second exterior member 11 is arranged on the plate portion 10a of the first exterior member 10. That is, the watch case 1 is configured to be mounted on the outer case 7 by clamping the first exterior member 10 by a plurality of screw members 12 in a state where the inner case 8 is arranged in the outer case 7 and the first exterior member 10 is arranged on each upper surface of the outer case 7 and the inner case 8.

[0021] However, if Figure 1 to Figure 4 As shown, the second exterior member 11 is formed into a substantially annular shape by a first fiber-reinforced resin body 13 and a second fiber-reinforced resin body 14. The first fiber-reinforced resin body 13 is formed by laminating a plurality of first fiber-reinforced resin sheets. The first fiber-reinforced resin sheet is a glass fiber-reinforced resin sheet using glass fiber as a reinforcing material, i.e., a glass fiber layer S1.

[0022] In this case, if Figure 1 to Figure 4 As shown, the first fiber-reinforced resin body 13 is a glass fiber reinforced resin sheet body (GFRP) formed by stacking a glass fiber layer S1 as a first fiber-reinforced resin sheet at a predetermined inclination angle θ in a direction perpendicular to the thickness direction as the front and back directions of the first fiber-reinforced resin body 13. The first fiber-reinforced resin body 13 has a surface portion 13a and a side portion 13b, and a cross-sectional shape is formed into a substantially eaves shape (inverted L shape).

[0023] That is, Figure 4 and Figure 5 As shown, the first fiber-reinforced resin body 13 is formed into a structure in which a plurality of glass fiber-reinforced resin sheets, i.e., glass fiber layers S1, which are glass fiber-reinforced resin sheets formed by curing glass fibers with epoxy resin, are stacked at a predetermined inclination angle θ in a direction perpendicular to the thickness direction, which is the front and back directions of the first fiber-reinforced resin body 13, i.e., a plurality of glass fiber-reinforced resin sheets are stacked at a predetermined inclination angle θ relative to the second fiber-reinforced resin sheet 14 described later. In this case, the inclination of the glass fiber layer S1 of the first fiber-reinforced resin sheet, which is the first fiber-reinforced resin body 13, is inclined toward the 3 o'clock and 9 o'clock directions of the watch case 1.

[0024] That is, the band mounting parts 2 are provided on the 12 o'clock side and the 6 o'clock side of the watch case 1, and the watch band (not shown) is mounted on these band mounting parts 2. Therefore, the external force applied to the watch case 1 is mostly received from the 3 o'clock side and the 9 o'clock side. In view of this, the strength is improved by stacking the glass fiber layer S1 at a predetermined inclination angle θ in the 3 o'clock and 9 o'clock directions.

[0025] In such a structure, when an external force is applied to the front and back directions of the first fiber-reinforced resin body 13, a shear force is applied that causes the glass fiber layers S1 to peel off from each other, so the strength of the external force applied to the front and back directions of the first fiber-reinforced resin body 13 is low. In this case, the first fiber-reinforced resin body 13 is configured so that the bonding area of ​​the interface between the glass fiber layers S1 is increased by the inclination amount of the inclination angle θ by inclining each glass fiber layer S1 with respect to the front and back directions thereof, thereby improving the bonding strength of the interface between the glass fiber layers S1.

[0026] In this case, if Figure 5 As shown, the inclination angle θ of the glass fiber layer S1 is an angle of inclination relative to the front and back directions of the first fiber-reinforced resin body 13, and is preferably inclination at an angle of 30° to 70°, for example, 45°, relative to the front and back directions (thickness direction) of the first fiber-reinforced resin body 13. Therefore, the first fiber-reinforced resin body 13 is configured such that each end surface of the stacked plurality of glass fiber layers S1 is exposed on each outer surface of the surface portion 13a and the side portion 13b and can be seen from the outside, thereby improving the decorativeness and design.

[0027] That is, Figure 5 As shown, on the surface portion 13a of the first fiber-reinforced resin body 13, the end faces of the plurality of glass fiber layers S1 appear to be arranged in parallel linear stripes along the straight line connecting 12 o'clock and 6 o'clock, for example. In addition, on the side portion 13b of the first fiber-reinforced resin body 13, the end faces of the plurality of glass fiber layers S1 appear to be arranged in parallel linear stripes at a predetermined inclination angle θ, for example, an angle of 45°. In this case, on the side portions 13b on the 3 o'clock side and the 9 o'clock side, the end faces of the plurality of glass fiber layers S1 appear to be arranged in parallel linear stripes along the front and back directions of the first fiber-reinforced resin body 13.

[0028] In addition, if Figure 5 As shown, the first fiber-reinforced resin body 13 is colored so that each end surface of the stacked plurality of glass fiber layers S1 exhibits a striped color pattern as a whole. That is, when the plurality of glass fiber layers S1 are cured by epoxy resin, a pigment is mixed into the epoxy resin, so that the plurality of glass fiber layers S1 are colored in different colors, that is, each glass fiber layer S1 is colored in a different color.

[0029] On the other hand, Figure 4 As shown, the second fiber reinforced resin body 14 is formed by stacking a plurality of second fiber reinforced resin sheets. That is, the second fiber reinforced resin sheet is a carbon fiber reinforced resin sheet using carbon fiber as a reinforcing material, that is, a carbon fiber layer S2. In this case, the second fiber reinforced resin body 14 is a carbon fiber reinforced resin sheet body (CFRP) formed by stacking a plurality of carbon fiber layers S2 as second fiber reinforced resin sheets in the thickness direction as the front and back directions of the second fiber reinforced resin body 14, and the cross-sectional shape is formed into a substantially quadrilateral shape.

[0030] That is, Figure 4 As shown, the second fiber reinforced resin body 14 is formed by stacking multiple carbon fiber reinforced resin sheets, i.e., carbon fiber layers S2, which are formed by curing carbon fibers with epoxy resin, in the front and back directions (thickness direction) of the second fiber reinforced resin body 14. Therefore, the compressive strength in the thickness direction and the tensile strength in the surface direction are higher than those of the first fiber reinforced resin body 13.

[0031] That is, Figure 4 As shown, the second fiber reinforced resin body 14 is a structure in which carbon fiber layers S2 are stacked in the front and back directions of the second fiber reinforced resin body 14, and the first fiber reinforced resin body 13 is a structure in which glass fiber layers S1 are stacked at an inclined angle θ, for example, 45°, in a direction orthogonal to the front and back directions of the first fiber reinforced resin body 13.

[0032] Therefore, if Figure 4 As shown, the bonding area at the interface of the carbon fiber layer S2 of the second fiber-reinforced resin body 14 is formed to be larger than the bonding area at the interface of the glass fiber layer S1 of the first fiber-reinforced resin body 1, and the bonding strength at the interface of the carbon fiber layer S2 is formed to be higher than the bonding strength at the interface of the glass fiber layer S1 of the first fiber-reinforced resin body 1. As a result, the compressive strength in the thickness direction and the tensile strength in the surface direction of the second fiber-reinforced resin body 14 are formed to be higher than the compressive strength in the thickness direction and the tensile strength in the surface direction of the first fiber-reinforced resin body 13.

[0033] like Figure 4 As shown, the second fiber-reinforced resin body 14 is arranged on the back side of the first fiber-reinforced resin body 13, that is, arranged on the lower surface of the surface portion 13a and the inner surface of the side portion 13b of the first fiber-reinforced resin body 13, and is firmly joined by thermocompression. That is, since the epoxy resin of the glass fiber layer S1 in the glass fiber reinforced resin sheet (GFRP) as the first fiber-reinforced resin body 13 and the epoxy resin of the carbon fiber layer S2 in the carbon fiber reinforced sheet (CFRP) as the second fiber-reinforced resin body 14 are mutually melted and fixed by thermocompression, the first fiber-reinforced resin body 13 and the second fiber-reinforced resin body 14 are firmly joined.

[0034] In this case, if Figure 4 As shown, the thickness of the second fiber-reinforced resin body 14 in the front and back directions is formed to be thicker than the thickness of the surface portion 13a of the first fiber-reinforced resin body 13, and the lower surface of the second fiber-reinforced resin body 14 is formed to be arranged on the same plane as the lower end surface of the side portion 13b of the first fiber-reinforced resin body 13. As a result, the second fiber-reinforced resin body 14 has a structure that overlaps the back side of the first fiber-reinforced resin body 13 and is integrally joined to the first fiber-reinforced resin body 13.

[0035] In addition, if Figure 1 to Figure 5 As shown in FIG. 1 , the second fiber-reinforced resin body 14 includes a main body 14c and a plurality of mounting protrusions 14a. The main body 14c is formed in a substantially ring shape as a whole. The plurality of mounting protrusions 14a are provided in a part of the main body 14c of the second fiber-reinforced resin body 14 in a manner of protruding laterally from the side surface 13b of the first fiber-reinforced resin body 13, that is, provided on each side surface at the 1 o'clock side, the 5 o'clock side, the 7 o'clock side, and the 11 o'clock side.

[0036] That is, Figures 1 to 5 As shown, the plurality of mounting protrusions 14a are formed in a cylindrical shape and are provided to protrude from the main body 14c of the second fiber-reinforced resin body 14. The thickness of the plurality of mounting protrusions 14a is formed to be slightly thinner than the thickness of the second fiber-reinforced resin body 14.

[0037] In this case, if Figure 1 and Figure 3 As shown in FIG. 1 , when viewed from above, the plurality of mounting protrusions 14a are formed so that approximately half of the circle protrudes from the side surface portion 13b of the first fiber-reinforced resin body 13, and the other half of the circle bites into the second fiber-reinforced resin body 14, one level lower than the upper surface of the second fiber-reinforced resin body 14. That is, the joining surface between the lower surface, which is the back surface of the surface portion 13a of the first fiber-reinforced resin body 13, and the upper surface, which is the surface of the second fiber-reinforced resin body 14, is provided at a position higher than the upper surface, which is the surface of the mounting protrusions 14a, in the thickness direction of the second fiber-reinforced resin body 14.

[0038] In addition, if Figure 1 to Figure 3 As shown, semicircular cutouts 13c are provided on the side surface 13b of the first fiber reinforced resin body 13 corresponding to the mounting protrusions 14a. In addition, first screw insertion holes 14b for inserting the screw members 12 are provided through the mounting protrusions 14a in the front and back directions, i.e., in the thickness direction.

[0039] On the other hand, Figure 1 as well as Figure 2 As shown, mounting holes, i.e., threaded mounting holes 7b for mounting the threaded member 12, are provided on both sides of the belt mounting portion 2 of the outer housing 7 in the housing body 5, i.e., the 1 o'clock side, the 5 o'clock side, the 7 o'clock side, and the 11 o'clock side of the outer housing 7. These multiple threaded mounting holes 7b are holes that are provided from the upper surface of the outer housing 7 toward the lower surface and are not through-holes in the upper and lower directions.

[0040] like Figure 2 As shown in the figure, the plurality of threaded mounting holes 7b are respectively provided with a non-threaded hole portion on the upper side where no thread groove is provided and a threaded hole portion on the lower side where a thread groove is provided, and they are arranged on the same axis. In this case, in the plate portion 10a of the first exterior member 10, the second threaded insertion hole 10d for inserting the threaded member 12 is correspondingly arranged on the threaded mounting hole 7b of the outer housing 7 and the first threaded insertion hole 14b of the second exterior member 11 on the same axis.

[0041] like Figure 1 as well as Figure 2 As shown in FIG. 1 , the screw member 12 includes a head 12a, a neck 12b, and a screw portion 12c. The outer diameter of the head 12a is formed to be substantially the same as or slightly smaller than the outer diameter of each mounting protrusion 14a of the second fiber-reinforced resin body 14. Thus, the head 12a is configured so that its outer peripheral surface does not contact the inner peripheral surface of the semicircular cutout portion 13c provided in the first fiber-reinforced resin body 13.

[0042] In addition, if Figure 1 as well as Figure 2As shown, the length of the head 12a in the axial direction, i.e., the length in the thickness direction of the second exterior member 11, is formed to be substantially the same as the thickness of the mounting protrusion 14a, and slightly shorter than the length from the upper surface of the mounting protrusion 14a to the upper surface of the second exterior member 11, i.e., the upper surface of the surface portion 13a of the first fiber-reinforced resin body 13. Thus, the head 12a is configured so that its upper surface does not protrude upward from the upper surface of the surface portion 13a of the first fiber-reinforced resin body 13.

[0043] like Figure 2 As shown, the outer diameter of the neck portion 12b is formed to be slightly smaller than the inner diameter of the first threaded insertion hole 14b of the mounting protrusion 14a. The length of the neck portion 12b in the axial direction, that is, the length in the vertical direction, is formed to be slightly longer than the length obtained by adding the depth of the first threaded insertion hole 14b of the mounting protrusion 14a and the depth of the second threaded insertion hole 10d of the plate portion 10a of the first exterior member 10. Thus, the neck portion 12b is configured so that when the head portion 12a is pressed against the mounting protrusion 14a, the lower end portion of the neck portion 12b is inserted into the non-threaded hole portion on the upper side of the threaded mounting hole 7b.

[0044] like Figure 2 As shown, the outer diameter of the threaded portion 12c is formed to be slightly smaller than the outer diameter of the neck portion 12b, and the axial length is formed to be shorter than the axial length of the threaded hole portion on the lower side of the threaded mounting hole 7b of the outer housing 7. Thus, the threaded portion 12c is configured to be screwed into the threaded hole portion of the threaded mounting hole 7b through the non-threaded hole portion of the threaded mounting hole 7b. In this case, the threaded portion 12c is configured so that its lower end portion does not reach the bottom of the threaded hole portion on the lower side of the threaded mounting hole 7b.

[0045] Therefore, if Figure 2 As shown, the threaded component 12 is constructed so that, when the exterior component 6 is arranged on the shell body 5, the exterior component 6 is mounted on the shell body 5 when the threaded portion 12c is inserted from the first threaded insertion hole 14b of the mounting protrusion 14a of the second fiber reinforced resin body 14 of the second exterior component 11 of the exterior component 6 into the second threaded insertion hole 10d of the first exterior component 10 and is screwed into the threaded hole portion of the threaded mounting hole 7b of the outer shell 7 to be tightened.

[0046] That is, Figure 2 As shown, the threaded component 12 is constructed so that when the threaded portion 12c is screwed into the threaded mounting hole 7b of the outer shell 7 and tightened, the head 12a is pressed against the mounting protrusion 14a of the second fiber reinforced resin body 14, so that the second exterior component 11 reliably presses the first exterior component 10 against the outer shell 7 and firmly mounts the exterior component 6 on the shell body 5.

[0047] In this case, if Figure 2As shown, the screw component 12 is constructed so that when the head 12a is tightened, even if the head 12a is pressed against the upper surface of the mounting protrusion 14a of the second fiber-reinforced resin body 14 and rotates, since the upper surface of the mounting protrusion 14a is located one level lower than the upper surface of the second fiber-reinforced resin body 14, that is, the joint surface between the lower surface of the surface portion 13a of the first fiber-reinforced resin body 13 and the upper surface of the second fiber-reinforced resin body 14 is located at a higher position than the upper surface of the mounting protrusion 14a in the thickness direction of the second fiber-reinforced resin body 14, the lower surface of the surface portion 13a of the first fiber-reinforced resin body 13 and the upper surface of the second fiber-reinforced resin body 14 will not be peeled off due to the rotation of the head 12a.

[0048] In addition, if Figure 1 and Figure 2 As shown, the second exterior component 11 is constructed so that when a plurality of mounting protrusions 14a provided on the 1 o'clock side, the 5 o'clock side, the 7 o'clock side, and the 11 o'clock side of the second fiber reinforced resin body 14 are pressed against the outer shell 7 of the shell body 5 by the screw component 12, no shear force is applied that causes the carbon fiber layers S2 of the second fiber reinforced resin body 14 to peel off from each other, but a force is applied in a direction that causes the carbon fiber layers S2 to compress each other, thereby ensuring the strength of the plurality of mounting protrusions 14a in the second fiber reinforced resin body 14.

[0049] Therefore, if Figure 1 as well as Figure 2 As shown, the second exterior component 11 is constructed so that even if the multiple mounting protrusions 14a are pressed against the outer shell 7 of the shell body 5 by the threaded component 12, the multiple mounting protrusions 14a will not be damaged, and the strength relative to the fastening force generated by the threaded component 12 can be improved, so that it can be reliably and firmly installed on the outer shell 7.

[0050] In addition, if Figure 2 As shown, the threaded component 12 is constructed such that when the threaded portion 12c is screwed into the threaded mounting hole 7b of the outer shell 7 and tightened, and the head 12a is pressed against the mounting protrusion 14a of the second fiber-reinforced resin body 14, the outer shell 7 is lifted toward the first exterior component 10, and the recessed portion 7a of the outer shell 7 pushes up the protrusion 8b of the inner shell 8, so that the inner shell 8 is pressed against the plate portion 10a of the first exterior component 10, thereby reliably and firmly mounting the exterior component 6 on the shell body 5.

[0051] Next, the assembly of the wristwatch case 1 will be described.

[0052] In this case, first, the housing body 5 is assembled. At this time, the inner housing 8 made of hard synthetic resin is inserted from above into the outer housing 7 made of metal such as stainless steel, and the convex portion 8b of the inner housing 8 is engaged with the concave portion 7a of the outer housing 7. Thus, the inner housing 8 is installed in the outer housing 7 without falling off to the lower side, and the housing body 5 is assembled.

[0053] In this state, the upper end surface of the outer case 7 is arranged slightly lower than the upper end surface of the inner case 8. In addition, a watch module (not shown) is assembled inside the inner case 8 of the case body 5, and a plurality of switch buttons 3 are mounted on the outer periphery of the case body 5. After that, the exterior member 6 is mounted on the case body 5. At this time, the watch glass 4 is previously embedded and mounted together with the gasket 4a in the cylindrical portion 10b of the first exterior member 10 made of metal such as stainless steel.

[0054] In this state, the waterproof ring 9 is arranged on the upper end surface of the inner housing 8, and the plate portion 10a of the first exterior member 10 is arranged across the upper end surface of the outer housing 7 and the upper end surface of the inner housing 8. At this time, the restriction portion 10c provided on the inner peripheral end of the plate portion 10a of the first exterior member 10 is brought into contact with the inner peripheral surface of the inner housing 8. As a result, the radial position of the first exterior member 10 is restricted, and the first exterior member 10 is arranged on the housing body 5. At this time, the second screw insertion holes 10d of the first exterior member 10 and the screw mounting holes 7b of the outer housing 7 are made to correspond to each other on the same axis.

[0055] In this state, the second exterior member 11 is arranged on the first exterior member 10. At this time, the second exterior member 11 is prepared in advance. In this case, first, the first fiber-reinforced resin body 13 and the second fiber-reinforced resin body 14 of the second exterior member 11 are prepared. That is, when the first fiber-reinforced resin body 13 is prepared, a plurality of glass fiber layers S1 formed by curing glass fibers with epoxy resin are stacked at a predetermined inclination angle θ, for example, 45°, in a direction perpendicular to the front and back directions of the first fiber-reinforced resin body 13, and are formed into a ring shape having a substantially eaves shape with a surface portion 13a and a side portion 13b.

[0056] In addition, when manufacturing the second fiber-reinforced resin body 14, the carbon fiber layer S2 formed by curing carbon fibers with epoxy resin is stacked in the front and back directions of the second fiber-reinforced resin body 14 to form a substantially ring shape with a substantially quadrilateral cross-sectional shape. Then, the second fiber-reinforced resin body 14 is arranged on the lower surface of the surface portion 13a of the first fiber-reinforced resin body 13 and the inner surface of the side portion 13b, and the first fiber-reinforced resin body 13 and the second fiber-reinforced resin body 14 are joined by thermal compression.

[0057] At this time, the epoxy resin of the glass fiber layer S1 in the glass fiber reinforced resin sheet (GFRP) as the first fiber reinforced resin body 13 and the epoxy resin of the carbon fiber layer S2 in the carbon fiber reinforced sheet (CFRP) as the second fiber reinforced resin body 14 are melted and firmly bonded to each other by thermal compression. In this state, the lower surface of the second fiber reinforced resin body 14 and the lower end surface of the side surface 13b of the first fiber reinforced resin body 13 are arranged on the same plane, and the second fiber reinforced resin body 14 overlaps the back side of the first fiber reinforced resin body 13 and forms a whole with the first fiber reinforced resin body 13.

[0058] Then, the second exterior member 11 to which the first fiber-reinforced resin body 13 and the second fiber-reinforced resin body 14 are joined is fitted into the outer periphery of the cylindrical portion 10b of the first exterior member 10 and arranged on the plate portion 10a of the first exterior member 10. In this state, the first screw insertion holes 14b of the plurality of mounting protrusions 14a of the second fiber-reinforced resin body 14 provided in the second exterior member 11 are made to correspond to the plurality of second screw insertion holes 10d provided in the plate portion 10a of the first exterior member 10 on the same axis.

[0059] In this state, the second exterior member is mounted on the housing body 5 together with the first exterior member 10 by the plurality of screw members 12. At this time, the screw portions 12c of the plurality of screw members 12 are inserted from the first screw insertion holes 14b of the plurality of mounting protrusions 14a of the second fiber reinforced resin body 14 provided on the second exterior member 11 into the plurality of second screw insertion holes 10d provided on the plate portion 10a of the first exterior member 10, and the inserted screw portions 12c are screwed into the plurality of screw mounting holes 7b provided on the outer housing 7 of the housing body 5 and fastened.

[0060] Then, the heads 12a of the plurality of screw members 12 are pressed against the plurality of mounting protrusions 14a of the second fiber-reinforced resin body 14, and the plate portion 10a of the first exterior member 10 is pressed against the outer housing 7. At this time, since the second fiber-reinforced resin body 14 is a structure in which carbon fibers are stacked in the front and back directions of the second fiber-reinforced resin body 14, the strength is higher than that of the first fiber-reinforced resin body 13. Therefore, even if the mounting protrusion 14a of the second fiber-reinforced resin body 14 is pressed toward the outer housing 7 via the first exterior member 10 by the heads 12a of the screw members 12, the mounting protrusion 14a is not damaged, and the mounting strength of the second exterior member 11 is high, and the impact resistance can be improved.

[0061] In this case, when the head 12a of the screw component 12 is tightened, even if the head 12a is pressed against the upper surface of the mounting protrusion 14a of the second fiber-reinforced resin body 14 and rotates, since the upper surface of the mounting protrusion 14a is located one level lower than the upper surface of the second fiber-reinforced resin body 14, that is, the joining surface between the lower surface of the surface portion 13a of the first fiber-reinforced resin body 13 and the upper surface of the second fiber-reinforced resin body 14 is located higher than the upper surface of the mounting protrusion 14a in the thickness direction of the second fiber-reinforced resin body 14, it is possible to prevent the lower surface of the surface portion 13a of the first fiber-reinforced resin body 13 and the upper surface of the second fiber-reinforced resin body 14 from peeling off due to the crimping rotation of the head 12a.

[0062] That is, when the joint surface between the lower surface of the surface portion 13a of the first fiber-reinforced resin body 13 and the upper surface of the second fiber-reinforced resin body 14 is at the same height as the lower surface of the head portion 12a of the screw member 12, when the head portion 12a of the screw member 12 is tightened and the lower surface of the head portion 12a is pressed against the upper surface of the mounting protrusion 14a of the second fiber-reinforced resin body 14 and rotates, there is a possibility that the lower surface of the surface portion 13a of the first fiber-reinforced resin body 13 and the upper surface of the second fiber-reinforced resin body 14 are separated due to the rotation of the head portion 12a. Therefore, the joint surface between the lower surface of the surface portion 13a of the first fiber-reinforced resin body 13 and the upper surface of the second fiber-reinforced resin body 14 needs to be located at a different position from the lower surface of the head portion 12a, that is, at a position higher than the lower surface of the head portion 12a.

[0063] Furthermore, when the heads 12a of the plurality of screw members 12 are pressed against the plurality of mounting protrusions 14a of the second fiber-reinforced resin body 14, the plate portion 10a of the first exterior member 10 presses the waterproof ring 9 against the upper end surface of the inner housing 8 while pulling the outer housing 7 upward toward the plate portion 10a of the first exterior member 10. As a result, the recessed portion 7a of the outer housing 7 pushes up the raised portion 8b of the inner housing 8 and presses the inner housing 8 toward the plate portion 10a of the first exterior member 10.

[0064] Therefore, the waterproof ring 9 is sandwiched and compressed between the plate portion 10a of the first exterior member 10 and the inner case 8, thereby ensuring waterproofness between the plate portion 10a of the first exterior member 10 and the inner case 8. Thus, the exterior member 6 is reliably and firmly attached to the case body 5, and the watch case 1 is assembled.

[0065] Next, the operation of such a wristwatch case 1 will be described.

[0066] In the watch case 1, the first fiber-reinforced resin body 13 of the second exterior component 11 is a structure in which glass fiber layers S1 formed by curing glass fibers with epoxy resin are stacked at a predetermined inclination angle θ, for example, 45°, in a direction perpendicular to the front and back directions of the first fiber-reinforced resin body 13, so that the end faces of the multiple glass fiber layers S1 are exposed on the outer surfaces of the surface portion 13a and the side portion 13b and can be seen from the outside.

[0067] That is, Figure 5 As shown, on the surface portion 13a of the first fiber-reinforced resin body 13, the end faces of the plurality of glass fiber layers S1 appear to be arranged in parallel linear stripes along a straight line connecting 12 o'clock and 6 o'clock, for example. In addition, on the side portion 13b of the first fiber-reinforced resin body 13, the end faces of the plurality of glass fiber layers S1 appear to be arranged in parallel linear stripes at a predetermined inclination angle θ, for example, an angle of 45°. In this case, on each side portion 13b on the 3 o'clock side and the 9 o'clock side, the end faces of the plurality of glass fiber layers S1 appear to be arranged in parallel linear stripes along the front and back directions of the first fiber-reinforced resin body 13. As a result, the decorativeness and designability of the first fiber-reinforced resin body 13 are improved.

[0068] In this case, if Figure 5 As shown, when the first fiber-reinforced resin body 13 is formed by curing glass fibers with epoxy resin to form the glass fiber layer S1, a pigment is mixed into the epoxy resin so that each glass fiber layer S1 is colored with a different color. Therefore, the first fiber-reinforced resin body 13 is colored so that each end surface of the stacked plurality of glass fiber layers S1 forms a striped color pattern as a whole. As a result, the decorativeness of the first fiber-reinforced resin body 13 is further improved, and the designability is improved.

[0069] Thus, according to the second exterior component 11 of the watch case 1, there is a first fiber-reinforced resin body 13 having a plurality of glass fiber layers S1 stacked as a first fiber-reinforced resin sheet and a second fiber-reinforced resin body 14 having a plurality of carbon fiber layers S2 stacked as a second fiber-reinforced resin sheet. The glass fiber layers S1 of the first fiber-reinforced resin body 13 are stacked obliquely relative to the carbon fiber layers S2 of the second fiber-reinforced resin body 14, thereby improving the designability and increasing the strength to achieve improved impact resistance.

[0070] That is, in the second exterior component 11, the glass fiber layer S1 of the first fiber-reinforced resin body 13 is stacked obliquely relative to the carbon fiber layer S2 of the second fiber-reinforced resin body 14. Therefore, the compressive strength in the thickness direction of the second fiber-reinforced resin body 14 in the front and back directions and the tensile strength in the surface direction of the second fiber-reinforced resin body 14 can be increased compared to the first fiber-reinforced resin body 13, thereby improving the impact resistance.

[0071] In this case, in the second exterior component 11, the glass fiber layer S1 of the first fiber reinforced resin sheet serving as the first fiber reinforced resin body 13 is stacked obliquely in the thickness direction of the front and back surfaces of the first fiber reinforced resin body 13, and the carbon fiber layer S2 of the second fiber reinforced resin sheet serving as the second fiber reinforced resin body 14 is stacked in the thickness direction of the front and back surfaces of the second fiber reinforced resin body 14, thereby improving the designability and increasing the strength to achieve improved impact resistance.

[0072] That is, in the second exterior component 11, the glass fiber layer S1 of the first fiber-reinforced resin body 13 is inclined at a predetermined inclination angle θ in the thickness direction of the first fiber-reinforced resin body 13 and is stacked in a direction orthogonal to the front and back directions. Therefore, each end face of the stacked multiple glass fiber layers S1 can be exposed on the surface and side surfaces of the first fiber-reinforced resin body 13, thereby enabling patterns to be expressed through each end face of the multiple glass fiber layers S1, thereby achieving excellent decorative properties and improving design properties.

[0073] In this case, on the surface of the first fiber-reinforced resin body 13, each end face of the plurality of glass fiber layers S1 appears to be arranged in a linear stripe shape parallel to each other along a straight line connecting 12 o'clock and 6 o'clock. In addition, on the side surface of the first fiber-reinforced resin body 13, each end face of the plurality of glass fiber layers S1 appears to be arranged in a linear stripe shape parallel to each other in a state inclined at a predetermined inclination angle θ, for example, an angle of 45°. In this case, on the side surface of the 3 o'clock side and the 9 o'clock side, each end face of the plurality of glass fiber layers S1 appears to be arranged in a linear stripe shape parallel to each other along the front and back directions of the first fiber-reinforced resin body 13. Therefore, in the first fiber-reinforced resin body 13, it is possible to express a stripe pattern well through each end face of the plurality of glass fiber layers S1, so that the decorativeness can be improved, and the design can be improved.

[0074] In addition, in the second exterior member 11, the carbon fiber layers S2 of the second fiber-reinforced resin body 14 are stacked in the front and back directions, that is, in the thickness direction of the second fiber-reinforced resin body 14, thereby improving the strength compared with the first fiber-reinforced resin body 13 using glass fibers. In this case, in the second exterior member 11, the second fiber-reinforced resin body 14 has a structure in which the carbon fiber layers S2 using carbon fibers as a reinforcing material are stacked in the thickness direction of the second fiber-reinforced resin body 14, and therefore, the compressive strength in the thickness direction, which is the front and back directions of the second fiber-reinforced resin body 14, and the tensile strength in the surface direction of the second fiber-reinforced resin body 14 can be improved compared with the first fiber-reinforced resin body 13, thereby improving the impact resistance.

[0075] That is, the second fiber-reinforced resin body 14 is a structure in which the carbon fiber layers S2 are stacked in the front and back directions of the second fiber-reinforced resin body 14, and the first fiber-reinforced resin body 13 is a structure in which the glass fiber layers S1 are stacked at a predetermined inclination angle θ, for example, 45°, in a direction orthogonal to the front and back directions of the first fiber-reinforced resin body 13. Therefore, the second fiber-reinforced resin body 14 can make the bonding area at the interface between the carbon fiber layers S2 larger than the bonding area at the interface between the glass fiber layers S1 of the first fiber-reinforced resin body 13.

[0076] Therefore, the second fiber-reinforced resin body 14 can make the bonding strength at the interface between the carbon fiber layers S2 higher than the bonding strength at the interface between the glass fiber layers S1 of the first fiber-reinforced resin body 13, and thus the compressive strength in the thickness direction and the tensile strength in the surface direction of the second fiber-reinforced resin body 14 can be higher than the compressive strength in the thickness direction and the tensile strength in the surface direction of the first fiber-reinforced resin body 13.

[0077] In addition, in the second exterior member 11, the first fiber-reinforced resin body 13 is colored for each glass fiber layer S1, so that a striped color pattern can be expressed by each end surface of the plurality of glass fiber layers S1, thereby further improving the decorativeness and thus the design. That is, when the first fiber-reinforced resin body 13 is cured using epoxy resin, a pigment is mixed into the epoxy resin, so that each glass fiber layer S1 can be colored, so that a striped pattern can be well expressed by color by each end surface of the plurality of glass fiber layers S1.

[0078] In addition, in the second exterior component 11, the second fiber-reinforced resin body 14 is joined to the back side of the first fiber-reinforced resin body 13 by thermocompression bonding, thereby enabling the second fiber-reinforced resin body 14 to overlap with the back side of the first fiber-reinforced resin body 13 and be reliably and firmly joined to the first fiber-reinforced resin body 13.

[0079] That is, in the second exterior component 11, by hot pressing the first fiber-reinforced resin body 13 and the second fiber-reinforced resin body 14, the epoxy resin of the glass fiber layer S1 in the glass fiber reinforced resin sheet (GFRP) serving as the first fiber-reinforced resin body 13 and the epoxy resin of the carbon fiber layer S2 in the carbon fiber reinforced sheet (CFRP) serving as the second fiber-reinforced resin body 14 can be melted and fixed to each other, thereby enabling the first fiber-reinforced resin body 13 and the second fiber-reinforced resin body 14 to be firmly joined.

[0080] In addition, in the second exterior component 11, the first fiber-reinforced resin body 13 has a surface portion 13a and a side portion 13b, and the second fiber-reinforced resin body 14 has a mounting protrusion 14a protruding laterally from the side portion 13b of the first fiber-reinforced resin body 13. Thus, by providing the mounting protrusion 14a on the second fiber-reinforced resin body 14 having higher strength than the first fiber-reinforced resin body 13, the mounting strength can be increased, and the second fiber-reinforced resin body 14 can be reliably and firmly mounted on the shell body 5.

[0081] Furthermore, in the second exterior component 11, by making the joint surface between the lower surface of the back side of the surface portion 13a of the first fiber-reinforced resin body 13 and the upper surface of the surface of the second fiber-reinforced resin body 14 be located at a higher position in the thickness direction of the second fiber-reinforced resin body 14 than the upper surface of the surface of the mounting protrusion 14a, it is possible to prevent the lower surface of the surface portion 13a of the first fiber-reinforced resin body 13 and the upper surface of the second fiber-reinforced resin body 14 from peeling off due to the rotation of the head portion 12a when the screw component 12 is tightened.

[0082] In this case, in the second exterior component 11, the first threaded insertion hole 14b penetrates the mounting protrusion 14a provided on the second fiber-reinforced resin body 14 in the front and back directions of the second fiber-reinforced resin body 14, i.e., in the thickness direction, thereby enabling the threaded component 12 serving as a fastening component to be inserted, thereby enabling the second fiber-reinforced resin body 14 to be reliably and firmly mounted on the shell body 5 using the threaded component 12.

[0083] In addition, according to the watch case 1, by having a second exterior component 11 and a case body 5 on the surface of which the second exterior component 11 is arranged, the design can be improved by utilizing the first fiber-reinforced resin body 13 of the second exterior component 11, and the second fiber-reinforced resin body 14 of the second exterior component 11 can be improved in strength compared to the first fiber-reinforced resin body 13, so that the mounting strength of the second exterior component 11 relative to the case body 5 can be improved by utilizing the mounting protrusion 14a of the second fiber-reinforced resin body 14, thereby improving the impact resistance.

[0084] In this case, in the watch case 1, by providing the threaded mounting hole 7b serving as the mounting hole corresponding to the first threaded insertion hole 14b of the mounting protrusion 14a of the second fiber-reinforced resin body 14 on the case body 5, the threaded component 12 serving as the fastening component can be inserted into the first threaded insertion hole 14b of the mounting protrusion 14a of the second fiber-reinforced resin body 14 and screwed into the threaded mounting hole 7b of the case body 5, so that the second exterior component 11 can be reliably and firmly mounted on the case body 5.

[0085] That is, in the watch case 1, the second exterior component 11 is inserted into the first threaded insertion hole 14b provided on the mounting protrusion 14a of the second fiber-reinforced resin body 14 and is installed on the case body 5 through the threaded component 12 which serves as a fastening component installed in the threaded mounting hole 7b of the case body 5, so that the second exterior component 11 can be reliably and firmly installed on the case body 5.

[0086] In this case, in the watch case 1, the threaded component 12 includes a head 12a, a neck 12b and a threaded portion 12c. The threaded portion 12c is screwed from a first threaded insertion hole 14b of a mounting protrusion 14a of a second fiber-reinforced resin body 14 provided on the second exterior component 11 into a threaded mounting hole 7b of an outer case 7 provided on the case body 5 and tightened, so that the head 12a can be pressed against the mounting protrusion 14a of the second fiber-reinforced resin body 14 relative to the outer case 7, thereby enabling the second exterior component 11 to be reliably and firmly mounted on the case body 5.

[0087] That is, in the watch case 1, the mounting protrusion 14a of the second fiber reinforced resin body 14 pressed against the head 12a of the threaded component 12 is a structure in which carbon fibers are stacked in the front and back directions of the second fiber reinforced resin body 14. Therefore, the mounting protrusion 14a of the second fiber reinforced resin body 14 is stronger than the first fiber reinforced resin body 13, thereby improving the mounting strength of the second exterior component 11 relative to the case body 5, thereby improving the impact resistance.

[0088] Furthermore, in the watch case 1, the glass fiber layer S1 of the first fiber reinforced resin sheet as the first fiber reinforced resin body 13 is inclined in the 3 o'clock and 9 o'clock directions, thereby improving the strength of the second exterior member 11. That is, in the watch case 1, by providing a band attachment portion for attaching a watch band (not shown) at the 12 o'clock side and the 6 o'clock side, the external force of the watch band is increased from the 3 o'clock side and the 9 o'clock side. Therefore, the glass fiber layer S1 is stacked at a predetermined inclination angle θ in the 3 o'clock and 9 o'clock directions, thereby improving the strength.

[0089] In addition, in the above-mentioned embodiment, the case where the first fiber-reinforced resin body 13 is formed only by the glass fiber layer S1 formed by using epoxy resin to cure glass fiber is described, but the present invention is not limited to this. For example, a glass fiber layer formed by using epoxy resin to cure glass fiber and a carbon fiber layer formed by using epoxy resin to cure carbon fiber can also be combined to form the first fiber-reinforced resin body into a composite fiber-reinforced resin body.

[0090] In this case, a glass fiber reinforced resin sheet using glass fiber as a reinforcing material and a carbon fiber reinforced resin sheet using carbon fiber as a reinforcing material may be stacked to form the first fiber reinforced resin body 13. That is, a plurality of first fiber reinforced resin sheets may be formed from glass fiber reinforced resin sheets and carbon fiber reinforced resin sheets.

[0091] In this case, in the composite fiber reinforced resin body, the glass fiber layer and the carbon fiber layer can be stacked in a direction perpendicular to the front and back directions, i.e., the thickness direction, at a predetermined inclination angle θ. In such a composite fiber reinforced resin body, the carbon fiber layer can express black, so it is not necessary to color the glass fiber layer black.

[0092] In addition, in the above-mentioned embodiment, the second fiber-reinforced resin body 14 is described as a structure in which the carbon fiber layer S2 is stacked in the front and back directions of the second fiber-reinforced resin body 14, but the present invention does not necessarily require a carbon fiber layer S2. For example, it may be a glass fiber layer using glass fiber, and it may also be a boron fiber layer using boron fiber or an aramid fiber layer using aramid fiber.

[0093] Furthermore, in the above-mentioned embodiments, the case of application to a watch is described, but the present invention is not necessarily applicable to a watch, and can be applied to various clocks such as travel clocks, alarm clocks, table clocks, wall clocks, etc. In addition, the present invention is not necessarily applicable to a clock, and can be applied to electronic devices such as a mobile phone, a portable information terminal, etc.

[0094] As mentioned above, although one embodiment of the present invention has been described, the present invention is not limited thereto, and includes the invention described in the claims and the scope of equivalents thereof.

Claims

1. An exterior component, characterized in that: have: a first fiber-reinforced resin body including a plurality of first fiber-reinforced resin sheets stacked together; and a second fiber-reinforced resin body including a plurality of second fiber-reinforced resin sheets stacked together; The first fiber-reinforced resin sheet of the first fiber-reinforced resin body is stacked obliquely with respect to the second fiber-reinforced resin sheet of the second fiber-reinforced resin body.

2. The exterior component according to claim 1, characterized in that: The first fiber-reinforced resin sheet of the first fiber-reinforced resin body is stacked obliquely in the thickness direction of the first fiber-reinforced resin body. The second fiber-reinforced resin sheets of the second fiber-reinforced resin body are stacked in the thickness direction of the second fiber-reinforced resin body.

3. The exterior component according to claim 1 or 2, characterized in that: The first fiber-reinforced resin sheet of the first fiber-reinforced resin body is a glass fiber-reinforced resin sheet using glass fiber as a reinforcing material. The second fiber-reinforced resin sheet of the second fiber-reinforced resin body is a carbon fiber-reinforced resin sheet using carbon fibers as a reinforcing material.

4. The exterior component according to claim 1 or 2, characterized in that: The first fiber-reinforced resin sheet of the first fiber-reinforced resin body is a glass fiber-reinforced resin sheet using glass fiber as a reinforcing material and a carbon fiber-reinforced resin sheet using carbon fiber as a reinforcing material. The second fiber-reinforced resin sheet of the second fiber-reinforced resin body is a carbon fiber-reinforced resin sheet using carbon fibers as a reinforcing material.

5. The exterior component according to claim 1 or 2, characterized in that: The first fiber-reinforced resin body is formed by laminating the first fiber-reinforced resin sheets formed by using resin-cured fibers, and the laminated first fiber-reinforced resin sheets are each colored.

6. The exterior component according to claim 1 or 2, characterized in that: The second fiber-reinforced resin body is joined to the back surface side of the first fiber-reinforced resin body by thermocompression bonding.

7. The exterior component according to claim 1 or 2, characterized in that: The first fiber-reinforced resin body includes a surface portion and a side portion. The second fiber-reinforced resin body includes a mounting protrusion that protrudes laterally from the side surface portion of the first fiber-reinforced resin body.

8. The exterior component according to claim 7, characterized in that: A bonding surface between the rear surface of the first fiber-reinforced resin body and the front surface of the second fiber-reinforced resin body is located at a position higher than a surface of the mounting protrusion in a thickness direction of the second fiber-reinforced resin body.

9. The exterior component according to claim 7, characterized in that: The attachment protrusion of the second fiber-reinforced resin body is provided with an insertion hole penetrating in the front and back directions, that is, in the thickness direction.

10. A housing, characterized in that: have: The exterior component according to any one of claims 1 to 9; and A housing body having the exterior member disposed on a surface thereof.

11. The housing according to claim 10, characterized in that The housing body is provided with a mounting hole corresponding to an insertion hole of the mounting protrusion in the second fiber reinforced resin body.

12. The housing according to claim 11, characterized in that The exterior member is mounted to the case body by a fastening member that is inserted into the insertion hole of the mounting protrusion in the second fiber-reinforced resin body and mounted to the mounting hole of the case body.

13. The housing according to any one of claims 10 to 12, characterized in that: The first fiber-reinforced resin sheet of the first fiber-reinforced resin body is inclined in the 3 o'clock and 9 o'clock directions.

14. A timepiece, characterized in that: A housing according to any one of claims 10 to 13 is provided.

Images