Component, method and device for producing component

Abstract

The present disclosure relates to a component comprising a first tubular member comprising a tubular portion having a tubular shape and a second tubular member comprising a tubular portion having a tubular shape and arranged coaxially with the first tubular member. The first tubular member includes a plurality of protruding portions configured to protrude in an axial direction from one end of a tubular portion of the first tubular member and to be spaced apart from each other in a circumferential direction. The first tubular member and the second tubular member are coupled to each other such that each of the plurality of protruding portions is coupled to the second tubular member. Each of the plurality of protruding portions includes a distal portion coupled to the second tubular member and a base portion separated from the second tubular member. The present disclosure also relates to a method of manufacturing a component and an apparatus comprising a component.

Description

Technical Field

[0001] The present disclosure relates to a member in which two members are connected to each other, a method of manufacturing the member, and an apparatus. Background Art

[0002] A telephoto lens (which is an interchangeable lens for a digital camera and has a focal length of 300 mm or more) is heavy because its lens barrel is made of aluminum alloy or magnesium alloy. Such a telephoto lens needs to have high strength and low weight in order to improve the portability and operability of taking pictures. Therefore, development for reducing weight and increasing strength is underway. For example, a thermoplastic resin is used for the lens barrel or the cover for weight reduction, and a carbon fiber reinforced resin containing carbon fiber is used for the lens barrel or the cover for strength increase.

[0003] Each of the lens barrel and the cover needs to have a complex shape to attach the member to another member. Therefore, it is difficult to achieve the shape of the member as a single member during manufacturing. Japanese Patent Application Laid-Open No. 2019-194018 proposes a technique in which a cylindrical connecting member such as a lens barrel or a cover is manufactured by combining a plurality of resin members with each other. In the technique proposed in Japanese Patent Application Laid-Open No. 2019-194018, a cylindrical member including continuous carbon fiber and a thermoplastic resin is inserted into a mold, and the thermoplastic resin having a high temperature is caused to flow into the mold. Accordingly, a cylindrical molded resin product is formed and connected to the cylindrical member, thereby manufacturing a connecting member in which two cylindrical members are connected to each other. Summary of the Invention

[0004] According to a first aspect of the present disclosure, a member includes a first tubular member and a second tubular member. The first tubular member includes a tubular portion having a tubular shape. The second tubular member includes a tubular portion having a tubular shape and is arranged coaxially with the first tubular member. The first tubular member includes a plurality of protruding portions configured to protrude axially from one end of the tubular portion of the first tubular member and be spaced apart from each other in a circumferential direction. The first tubular member and the second tubular member are connected to each other such that each of the plurality of protruding portions is connected to the second tubular member. Each of the plurality of protruding portions includes a distal portion connected to the second tubular member and a base portion separated from the second tubular member.

[0005] According to a second aspect of the present disclosure, a method of manufacturing a component includes: providing a first tubular member and a second tubular member, the first tubular member including a tubular portion having a tubular shape, the second tubular member including a tubular portion having a tubular shape and being arranged coaxially with the first tubular member, the first tubular member including a plurality of protruding portions that protrude axially from one end of the tubular portion of the first tubular member and are spaced apart from each other in the circumferential direction; connecting each of the plurality of protruding portions to the second tubular member such that a distal portion of each of the plurality of protruding portions is connected to the second tubular member and a base portion of each of the plurality of protruding portions is separated from the second tubular member.

[0006] According to a third aspect of the present disclosure, a component includes: a base member; a first tubular member having a tubular shape, the first tubular member including a tubular portion including a first end surface and being supported by the base member; and a second tubular member having a tubular shape, the second tubular member including a tubular portion including a second end surface, the second tubular member being made of a material having a coefficient of linear expansion higher than that of the first tubular member and being supported by the base member. One of the tubular portions of the first tubular member or the second tubular member includes a protruding portion that protrudes from the first end surface or the second end surface. The other of the tubular portions of the first tubular member or the second tubular member includes a recessed portion that is recessed from the first end surface or the second end surface and that contacts the protruding portion at at least two positions. The first tubular member and the second tubular member are connected to each other such that a first gap is formed between the first end surface and the second end surface to allow relative movement between the first end surface and the second end surface in a direction in which the first end surface and the second end surface face each other in the case where the base member and the second tubular member expand or contract relative to the first tubular member due to a temperature change, and to maintain contact between the protruding portion and the recessed portion even if the first end surface and the second end surface move relative to each other in a direction in which the first end surface and the second end surface face each other by expansion or contraction of one of the protruding portion or the recessed portion relative to the other.

[0007] According to a fourth aspect of the present disclosure, a method of manufacturing a component, the method comprising: providing a base member, a first tubular member, and a second tubular member, the first tubular member having a tubular shape, the first tubular member including a tubular portion including a first end surface, and the first tubular member being supported by the base member, the second tubular member having a tubular shape, the second tubular member including a tubular portion including a second end surface, the second tubular member being made of a material having a coefficient of linear expansion higher than that of the first tubular member, and the second tubular member being supported by the base member, wherein one of the tubular portions of the first tubular member or the second tubular member includes a protruding portion protruding from the first end surface or the second end surface, wherein the other tubular portion of the first tubular member or the second tubular member includes a recessed portion recessed from the first end surface or the second end surface, and the recessed portion contacts the protruding portion at at least two positions; and connecting the first tubular member and the second tubular member such that a first gap is formed between the first end surface and the second end surface to allow relative movement between the first end surface and the second end surface in a direction in which the first end surface and the second end surface face each other in the case where the base member and the second tubular member expand or contract relative to the first tubular member due to temperature change, and maintaining the contact state between the protruding portion and the recessed portion even when the first end surface and the second end surface move relative to each other in a direction in which the first end surface and the second end surface face each other by expansion or contraction of one of the protruding portion or the recessed portion relative to the other.

[0008] Other features of the present disclosure will become apparent from the following description of exemplary embodiments with reference to the accompanying drawings. Description of the Drawings

[0009] Figure 1 is a perspective view showing a composite cylinder member of a first embodiment.

[0010] Figure 2 is a cross-sectional view showing a composite cylinder member of a first embodiment.

[0011] Figure 3 is an exploded perspective view showing a composite cylinder member of a first embodiment.

[0012] Figure 4 is an enlarged cross-sectional view showing a connecting portion of a composite cylinder member of a first embodiment.

[0013] Figure 5is a perspective view showing the composite cylinder member of the second embodiment.

[0014] Figure 6 is a cross-sectional view showing the composite cylinder member of the second embodiment.

[0015] Figure 7 is an exploded perspective view showing the composite cylinder member of the second embodiment.

[0016] Figure 8 is a perspective view showing the composite cylinder member of the third embodiment.

[0017] Figure 9 is a cross-sectional view showing the composite cylinder member of the third embodiment.

[0018] Figure 10 is an exploded perspective view showing the composite cylinder member of the third embodiment.

[0019] Figure 11 is an enlarged cross-sectional view showing the connecting portion of the composite cylinder member of the third embodiment.

[0020] Figure 12 is a perspective view showing the composite cylinder member of the first example.

[0021] Figure 13 is a cross-sectional view showing the composite cylinder member of the first example.

[0022] Figure 14 is an exploded perspective view showing the composite cylinder member of the first example.

[0023] Figure 15 is a perspective view showing the composite cylinder member of the comparative example.

[0024] Figure 16 is a cross-sectional view showing the composite cylinder member of the comparative example.

[0025] Figure 17 is an exploded perspective view showing the composite cylinder member of the comparative example.

[0026] Figure 18 is a perspective view showing the composite cylinder member of the fourth example.

[0027] Figure 19 is a cross-sectional view showing the composite cylinder member of the fourth example.

[0028] Figure 20 is an exploded perspective view showing the composite cylinder member of the fourth example.

[0029] Figure 21 is a perspective view showing the composite cylinder member of the fifth example.

[0030] Figure 22 It is a cross-sectional view of a composite cylinder member showing the fifth example.

[0031] Figure 23 It is an exploded perspective view of a composite cylinder member showing the fifth example.

[0032] Figure 24 It is a perspective view of a composite cylinder member showing the sixth example.

[0033] Figure 25 It is a cross-sectional view of a composite cylinder member showing the sixth example.

[0034] Figure 26 It is an exploded perspective view of a composite cylinder member showing the sixth example.

[0035] Figure 27 It is a perspective view of a composite cylinder member showing the seventh example.

[0036] Figure 28 It is a cross-sectional view of a composite cylinder member showing the seventh example.

[0037] Figure 29 It is an exploded perspective view of a composite cylinder member showing the seventh example.

[0038] Figure 30 It is a front view of a composite cylinder member showing the fourth embodiment.

[0039] Figure 31 It is a perspective view of a composite cylinder member showing the fourth embodiment.

[0040] Figure 32A It is a front view of a composite cylinder member showing the fifth embodiment.

[0041] Figure 32B It is along Figure 32A a cross-sectional view taken along the line indicated by arrow A-A in

[0042] Figure 33A It is a front view of a composite cylinder member showing the sixth embodiment.

[0043] Figure 33B It is along Figure 33A a cross-sectional view taken along the line indicated by arrow B-B in

[0044] Figure 34A It is a front view of a composite cylinder member showing the eighth example.

[0045] Figure 34B It is along Figure 34A a cross-sectional view taken along the line indicated by arrow C-C in

[0046] Figure 35is a perspective view showing an example of a braiding device.

[0047] Figure 36A is a schematic view showing the protruding portion and the recessed portion of the composite cylinder member of the fourth embodiment.

[0048] Figure 36B is a schematic view showing the protruding portion and the recessed portion of the composite cylinder member of the first modification.

[0049] Figure 36C is a schematic view showing the protruding portion and the recessed portion of the composite cylinder member of the second modification.

[0050] Figure 36D is a schematic view showing the protruding portion and the recessed portion of the composite cylinder member of the third modification.

[0051] Figure 36E is a schematic view showing the protruding portion and the recessed portion of the composite cylinder member of the fourth modification.

[0052] Figure 36F is a schematic view showing the protruding portion and the recessed portion of the composite cylinder member of the fifth modification.

[0053] Figure 36G is a schematic view showing the protruding portion and the recessed portion of the composite cylinder member of the sixth modification.

[0054] Figure 36H is a schematic view showing the protruding portion and the recessed portion of the composite cylinder member of the seventh modification. Detailed Description

[0055] In a replaceable lens or the like, a member that slides for zooming or focusing needs to have high roundness. However, since the connecting member described in Japanese Patent Application Laid-Open No. 2019-194018 is formed by connecting a tubular member containing continuous carbon fiber and a thermoplastic resin to a tubular molded resin product, these two members may have different linear expansion coefficients. In a connecting member in which two members having different linear expansion coefficients are connected to each other, if the ambient temperature changes and one of the members having a higher linear expansion coefficient expands or contracts, the member is constrained by the other member having a lower linear expansion coefficient and deforms unevenly, which deteriorates the roundness. In addition, there is a case where even though the two members in the connecting member have the same linear expansion coefficient, the roundness of one of the members is insufficient. In this case, even if the other member has sufficient roundness, when the two members are connected to each other, the other member will deform. Therefore, the roundness of the connecting member will deteriorate. Note that even if the connecting member has another tubular shape such as a polygon instead of a circular cross section, the shape of the connecting member will similarly deteriorate due to differences in expansion coefficient or accuracy.

[0056] The present disclosure provides a member capable of achieving good accuracy, a method of manufacturing the member, and an apparatus.

[0057] First Embodiment

[0058] Hereinafter, reference will be made to Figures 1 to 4 describe the first embodiment for implementing the present disclosure. Figure 1 is a perspective view showing a composite tube member (which may be simply referred to as a member), which is an example of a connecting member (which may be simply referred to as a member) of the first embodiment. Figure 2 is a cross-sectional view showing the composite tube member of the first embodiment. Figure 3 is an exploded perspective view showing the composite tube member of the first embodiment. Figure 4 is an enlarged cross-sectional view showing a connecting portion of the composite tube member of the first embodiment. Note that Figure 3 The exploded perspective view shows a state before the first tubular member 10 and the second tubular member 20, which will be described in detail below, are connected to each other. In addition, since the present embodiment described below is an example, those skilled in the art can appropriately modify the detailed configuration and the like without departing from the spirit of the present disclosure. In addition, since the numerical values described in the present embodiment are for reference, the present disclosure is not limited by the numerical values.

[0059] As Figure 1 , Figure 2 and Figure 3 shown, the composite tube member 1 used as a connecting member 1It includes a first tubular member 10 and a second tubular member 20 that are coaxially arranged on a central axis AX and made of the same material. The first tubular member 10 and the second tubular member 20 are connected to each other in a connection portion 31 by an adhesive or the like. Note that in the connection portion 31, if the materials of the first tubular member 10 and the second tubular member 20 are suitable for welding or thermal welding, the first tubular member 10 and the second tubular member 20 can be connected to each other by using welding or thermal welding.

[0060] The second tubular member 20 includes a tubular portion 21 (which is a cylindrical main body). On the other hand, the first tubular member 10 includes a tubular portion 11 (which is a cylindrical main body) and a plurality of protruding portions 12. The plurality of protruding portions 12 are formed to protrude from an end surface 11a of the tubular portion 11 in one direction in the axial direction (i.e., the Z2 direction). Each protruding portion 12 protrudes to form a so-called tab shape. In addition, each of the tubular portion 11 of the first tubular member 10 and the tubular portion 21 of the second tubular member 20 is formed to be similar to a cylinder formed around the central axis AX, and in a state where the tubular portion 11 and the tubular portion 21 are connected to each other, the tubular portion 11 and the tubular portion 21 are coaxially arranged.

[0061] In addition, the plurality of protruding portions 12 of the first tubular member 10 are arranged such that a gap dw is formed between the protruding portions 12 adjacent to each other in the circumferential direction. For example, in the first embodiment, the protruding portions 12 are evenly spaced from each other in the circumferential direction and are formed at four positions. In other words, the first tubular member 10 is formed such that a plurality of protruding portions 12 are formed (forming process). The protruding portions 12 protrude from one end (i.e., the end surface 11a) of the tubular portion 11 in the axial direction and are formed such that a gap dw is formed between the protruding portions 12 adjacent to each other in the circumferential direction. Each protruding portion 12 has a thickness slightly smaller than the thickness of the tubular portion 11 and has a so-called tab shape. In addition, each protruding portion 12 includes a distal end portion 12a and a base portion 12b. The base portion 12b is formed on the base side (i.e., on the tubular portion 11 side) relative to the distal end portion 12a. As Figure 2 shown, the distal end portion 12a of each protruding portion 12 is inserted and fitted into the inner circumferential side of the second tubular member 20 such that when viewed in the radial direction, the distal end portion 12a overlaps with the tubular portion 21 of the second tubular member 20. In addition, a connection portion 31 is arranged on the outer circumference of the distal end portion 12a for connecting the outer circumference of the distal end portion 12a and the inner circumference of the tubular portion 21. That is, the distal end portion 12a is connected to the second tubular member 20 such that the first tubular member 10 and the second tubular member 20 are connected to each other (connection process).

[0062] The base portion 12b is arranged not to overlap with the tubular portion 21 of the second tubular member 20 in the axial direction when viewed in the radial direction. That is, the first tubular member 10 and the second tubular member 20 are arranged such that the end surface 11a of the tubular portion 11 of the first tubular member 10 in the axial direction (i.e., the Z2 direction) and the end surface 21a of the tubular portion 21 of the second tubular member 20 in the axial direction (i.e., the Z1 direction) are separated from each other, and a gap dz is formed between the end surfaces 11a and 21a in the axial direction. Therefore, the base portion 12b of the protruding portion 12 does not contact the tubular portion 21 of the second tubular member 20 (i.e., the base portion 12b is separated from the tubular portion 21). That is, the outer peripheral side of the base portion 12b is not restricted by the tubular portion 21.

[0063] As described above, in the composite cylinder member 1 of the first embodiment 1 , the first tubular member 10 and the second tubular member 20 are connected to each other by a plurality of protruding portions 12. Therefore, if the first tubular member 10 has high roundness (high precision) and the second tubular member 20 has low (insufficient) roundness, the base portion 12b of the protruding portion 12 that does not contact the second tubular member 20 is deformed as Figure 4 shown. In this way, the deformation of the tubular portion 11 of the first tubular member 10 can be reduced. That is, the deterioration of the roundness of the first tubular member 10 caused by the second tubular member 20 can be reduced.

[0064] The connecting force between the first tubular member 10 and the second tubular member 20 can increase as the number of the protruding portions 12 or the connecting portions 31 increases, so that the strength of the composite cylinder member 1 1 can be increased. On the contrary, the deformation of the tubular portion 11 of the first tubular member 10 can be more reduced as the number of the protruding portions 12 or the connecting portions 31 decreases. In addition, the connecting force between the first tubular member 10 and the second tubular member 20 can increase as the length of the protruding portion 12 in the circumferential direction increases (i.e., as the gap dw decreases), so that the strength of the composite cylinder member 1 1 can be increased. On the contrary, the deformation of the tubular portion 11 of the first tubular member 10 can be more reduced as the length of the protruding portion 12 in the circumferential direction decreases (i.e., as the gap dw increases). In addition, the connecting force between the first tubular member 10 and the second tubular member 20 can increase as the gap dz between the end surface 11a of the tubular portion 11 of the first tubular member 10 and the end surface 21a of the tubular portion 21 of the second tubular member 20 decreases, so that the strength of the composite cylinder member 1 1 can be increased. On the contrary, the deformation of the tubular portion 11 of the first tubular member 10 can be more reduced as the gap dz increases.

[0065] In the first embodiment, as an example, each of the tubular portions 11 of the first tubular member 10 and the tubular portions 21 of the second tubular member 20 has a cylindrical shape. However, the cross-section of each of the tubular portions 11 and 21 may have an elliptical shape or a polygonal shape (such as a triangular shape, a rectangular shape, a pentagonal shape, or a hexagonal shape). In other cases, each of the tubular portions 11 of the first tubular member 10 and the tubular portions 21 of the second tubular member 20 may have a circularly tapered shape in which the diameter (or the slope of the outer peripheral surface) varies in the axial direction.

[0066] In the first embodiment, the case where the thickness of the protruding portion 12 is smaller than the thickness of the tubular portion 11 of the first tubular member 10 has been described. However, the protruding portion 12 may have a thickness equal to or greater than the thickness of the tubular portion 11 of the first tubular member 10. However, the deformation of the tubular portion 11 of the first tubular member 10 can be reduced more as the thickness of the protruding portion 12 decreases. On the contrary, the connecting force between the first tubular member 10 and the second tubular member 20 can increase as the thickness of the protruding portion 12 increases, so that the strength of the composite cylinder member 1 1 can be increased.

[0067] In addition, the coefficient of linear expansion of the first tubular member 10 and the coefficient of linear expansion of the second tubular member 20 may be different from each other. When the first tubular member 10 and the second tubular member 20 are made of metal, one of the first tubular member 10 and the second tubular member 20 may be made of steel and the other may be made of a copper alloy, or one of the first tubular member 10 and the second tubular member 20 may be made of stainless steel and the other may be made of aluminum. When the first tubular member 10 and the second tubular member 20 are made of a thermoplastic resin, one of the first tubular member 10 and the second tubular member 20 may be made of polycarbonate and the other may be made of polystyrene, or one of the first tubular member 10 and the second tubular member 20 may be made of PET and the other may be made of ABS. Even when the first tubular member 10 and the second tubular member 20 are made of the same thermoplastic resin, by making the amount of the filler of the thermoplastic resin of the first tubular member 10 and the amount of the filler of the thermoplastic resin of the second tubular member 20 different from each other, the coefficient of linear expansion of the first tubular member 10 and the coefficient of linear expansion of the second tubular member 20 can be made different from each other. For example, the first tubular member 10 may be made of polycarbonate without glass filler, while the second tubular member 20 may be made of polycarbonate containing 30% glass filler.

[0068] If the composite cylinder member 1 in which the first tubular member 10 and the second tubular member 20 having different coefficients of linear expansion are connected to each other1 When exposed to, for example, a high-temperature environment, the amount of expansion between the first tubular member 10 and the second tubular member 20 is different. However, since the base portion 12b of the protruding portion 12 is deformed (see Figure 4 and the description below Figure 11 ), the deterioration of the roundness of the composite cylinder member 1 1 can be reduced. Similarly, even when the composite cylinder member 1 1 is exposed to a low-temperature environment, the same effect can be achieved.

[0069] In addition, the material of the composite cylinder member 1 1 can be carbon fiber reinforced thermoplastic resin (CFRTP). The CFRTP may contain short fiber carbon, or may contain long fibers or continuous fibers. As the material of the continuous carbon fiber, prepreg sheets can be used. In the prepreg sheets, the fibers can be parallel to the axial direction or the circumferential direction, or one braid can be placed on top of another braid and the braid can have an angle with respect to the axial direction. For example, the first tubular member 10 having a complex shape like the protruding portion 12 can be made of a thermoplastic resin containing short fiber carbon (which is a material for injection molding). In addition, the second tubular member 20 having a simpler shape than the shape of the first tubular member 10 can be made of a thermoplastic resin in which a prepreg sheet containing continuous carbon fibers is braided. Since CFRTP is a high-strength material, the weight of the composite cylinder member 1 1 can be more effectively reduced. The thermoplastic resin containing continuous carbon fibers has a linear expansion coefficient of about 0 / °C, while the resin containing short fiber carbon has a higher linear expansion coefficient than the resin containing continuous carbon fibers. However, if the structure of the composite cylinder member 1 1 is used, as described above, the deterioration of the roundness can be reduced in a high-temperature environment or a low-temperature environment.

[0070] If the main components of the materials of the first tubular member 10 and the second tubular member 20 are thermoplastic resins made of the same material, the first tubular member 10 and the second tubular member 20 can be joined to each other by using thermal welding. In this case, since carbon fiber has a high thermal conductivity, heat and pressure are applied from the CFRTP side. Accordingly, the heat is transferred to the other tubular member, and the thermoplastic resins of the first tubular member 10 and the second tubular member 20 are melted together. In this way, the first tubular member 10 and the second tubular member 20 can be joined to each other. If the dimensions of each of the joining regions of the first tubular member 10 and the second tubular member 20 are constant, the joining force obtained by using thermal welding can be made stronger than the joining force obtained by using an adhesive. In particular, the main component of the material of each of the first tubular member 10 and the second tubular member 20 can be polycarbonate. Since polycarbonate is a thermoplastic resin and melts by applying heat, thermal welding can be performed on polycarbonate. Further, in the case of the composite cylinder member 1 1 when used in a lens barrel, less resin outgas is generated. Since resin outgas causes fogging of a lens in the thermal welding of polycarbonate, it is advantageous to use polycarbonate.

[0071] As described above, the first tubular member 10 and the second tubular member 20 can be made of any material such as metal, thermosetting resin, or thermoplastic resin. That is, the first tubular member 10 and the second tubular member 20 can be made of the same material or can be made of different materials. However, in the present embodiment, since the first tubular member 10 is a member in which a plurality of protruding portions 12 and a tubular portion 11 are integrally formed with each other, it is preferable that the first tubular member 10 is made of resin or the like. Further, since the second tubular member 20 has a simple cylindrical shape, the second tubular member 20 can be made of carbon fiber reinforced thermoplastic resin (CFRTP). If the first tubular member 10 and the second tubular member 20 are made of the same resin material or are made of resins whose main components are the same material (such as polycarbonate), the first tubular member 10 and the second tubular member 20 can be joined to each other at a joining portion 31 by using thermal welding.

[0072] Note that the composite cylinder member 1 of the present embodiment 1 can be used for a lens barrel or a hood of an optical device (such as an interchangeable lens of a single-lens reflex camera). In addition to this, the composite cylinder member 1 1 can be used for an external member of, for example, a robot arm. That is, the composite cylinder member 1 1 can be used for any device. In addition to the composite cylinder member of the first embodiment, any composite cylinder member described in the second to sixth embodiments or the first to eighth examples below can also be used for any device.

[0073] For example, when the composite cylinder member 1 1 is used as a lens barrel, a replaceable lens (i.e., an optical device used as a device) is constituted by the lens barrel (i.e., the member) and a lens (i.e., an optical element used as an element) surrounded by at least any one of the first tubular member 10 and the second tubular member 20. When the replaceable lens is constructed as described above, a member formed to be similar to an attachment portion for a tripod base can be attached to at least one of the first tubular member 10 and the second tubular member 20 or integrally formed with at least one of the first tubular member and the second tubular member. That is, a member having any shape can be attached to the tubular portion.

[0074] In addition, when the composite cylinder member 1 1 is used as an external member of a robot arm, a robot (i.e., a mechanical device used as a device) includes an external member (i.e., the member) and at least one member (i.e., an electrical or mechanical element used as an element) surrounded by at least any one of the first tubular member 10 and the second tubular member 20, such as wiring, a motor, a gear, and a link.

[0075] Therefore, the composite cylinder member 1 1 can be used for any device as long as the device is constituted by the composite cylinder member (i.e., the member) 1 1 and at least one element surrounded by at least any one of the first tubular member 10 and the second tubular member 20.

[0076] Second Embodiment

[0077] Next, the second embodiment will be described with reference to Figures 5 to 7 In the second embodiment, a part of the first embodiment is changed. Figure 5 is a perspective view showing the composite cylinder member of the second embodiment. Figure 6 is a cross-sectional view showing the composite cylinder member of the second embodiment. Figure 7 is an exploded perspective view showing the composite cylinder member of the second embodiment. Note that in the description of the second embodiment, the same components as those in the first embodiment described above are given the same reference numerals, and their descriptions will be omitted.

[0078] As Figure 5 , Figure 6 and Figure 7 shown, different from the composite cylinder member 1 1 of the first embodiment, in the composite cylinder member 1 2 used as a connecting member in the second embodiment, the thickness of the distal end portion of the tubular portion 21 of the second tubular member 20 in the axial direction (i.e., the Z1 direction) is made thinner.

[0079] Specifically, as Figure 5 , Figure 6 and Figure 7 shown, in the composite cylinder member 1 2 , the first tubular member 10 and the second tubular member 20 are arranged such that the positions of the end surfaces 11a of the tubular portion 11 of the first tubular member 10 and the end surfaces 21a of the tubular portion 21 of the second tubular member 20 are the same as each other in the axial direction. Additionally, the end portion 21b of the tubular portion 21 of the second tubular member 20 is made thinner such that at the position where the inner peripheral side of the tubular portion 21 overlaps with the base portion 12b of the protruding portion 12 in the axial direction, the inner peripheral side of the end portion 21b is recessed toward the outer peripheral side of the end portion 21b. That is, a gap dd is formed between the end portion 21b of the tubular portion 21 of the second tubular member 20 and the base portion 12b of the protruding portion 12, and the end portion 21b of the tubular portion 21 and the base portion 12b of the protruding portion 12 are separated from each other in the inner and outer diameter directions (i.e., the radial direction) by the gap dd. Accordingly, the base portion 12b of the protruding portion 12 does not contact the tubular portion 21 of the second tubular member 20 (i.e., the base portion 12b is separated from the tubular portion 21). That is, the outer peripheral side of the base portion 12b is not restricted by the tubular portion 21.

[0080] Even in the composite cylinder member 1 2 of the second embodiment constructed as described above, the first tubular member 10 and the second tubular member 20 are connected to each other by a plurality of protruding portions 12. Therefore, if the first tubular member 10 has high roundness (high precision) while the second tubular member 20 has low (insufficient) roundness, the base portion 12b of the protruding portion 12 that does not contact the second tubular member 20 deforms. In this way, the deformation of the tubular portion 11 of the first tubular member 10 can be reduced. That is, the deterioration of the roundness of the first tubular member 10 caused by the second tubular member 20 can be reduced.

[0081] Third Embodiment

[0082] Next, the third embodiment will be described with reference to Figures 8 to 11 . In the third embodiment, a part of the first and second embodiments is changed. Figure 8 is a perspective view showing the composite cylinder member of the third embodiment. Figure 9 is a cross-sectional view showing the composite cylinder member of the third embodiment.

[0083] Figure 10 is an exploded perspective view showing the composite cylinder member of the third embodiment. Figure 11It is an enlarged cross-sectional view showing the connecting portion of the composite cylinder member of the third embodiment. Note that in the description of the third embodiment, the components identical to those of the above-described first and second embodiments are given the same reference numerals, and their descriptions will be omitted.

[0084] As Figure 8 , Figure 9 , Figure 10 and Figure 11 shown, different from the composite cylinder members 1 1 and 1 2 of the first and second embodiments, in the composite cylinder member 1 3 serving as a connecting member in the third embodiment, the outer diameters of the tubular portions 11 of the first tubular member 10 and the tubular portions 21 of the second tubular member 20 are formed to be almost equal to each other. In other words, by making the thickness of the protruding portion 12 of the first tubular member 10 thinner than the thickness of the tubular portion 11, the first tubular member 10 is formed such that the protruding portion 12 enters the inner peripheral side of the tubular portion 21 of the second tubular member 20.

[0085] Specifically, as Figure 8 , Figure 9 and Figure 10 shown, in the composite cylinder member 1 3 , the first tubular member 10 and the second tubular member 20 are arranged such that when viewed in the radial direction, the positions of the end surfaces 11a of the tubular portion 11 of the first tubular member 10 and the end surfaces 21a of the tubular portion 21 of the second tubular member 20 are the same as each other in the axial direction. In addition, the first tubular member 10 and the second tubular member 20 are arranged such that when viewed in the axial direction, the end surface 21a of the tubular portion 21 of the second tubular member 20 overlaps with the end surface 11a of the tubular portion 11 of the first tubular member 10 in the radial direction, or slightly protrudes toward the outer peripheral side from the end surface 11a of the tubular portion 11 of the first tubular member 10. Therefore, in the composite cylinder member 1 3 , the connecting portion between the first tubular member 10 and the second tubular member 20 is formed such that the first tubular member 10 and the second tubular member 20 are connected to each other, and the composite cylinder member 1 3 is formed to be similar to a continuous cylinder and has an almost constant outer diameter.

[0086] In addition, the protruding portion 12 of the first tubular member 10 is formed such that the thickness of the entire protruding portion 12 is smaller than the thickness of the tubular portion 11, and the thickness of the base portion 12b is smaller than the thickness of the distal portion 12a. That is, in the inner and outer diameter directions, a gap dd is formed between the tubular portion 21 of the second tubular member 20 and the base portion 12b of the protruding portion 12. Therefore, the base portion 12b of the protruding portion 12 does not contact the tubular portion 21 of the second tubular member 20. That is, the outer peripheral side of the base portion 12b is not restricted by the tubular portion 21.

[0087] Even in the composite cylinder member 1 of the third embodiment configured as described above 3 the first tubular member 10 and the second tubular member 20 are connected to each other by a plurality of protruding portions 12. Therefore, if the first tubular member 10 has high roundness (high precision) while the second tubular member 20 has low (insufficient) roundness, the base portion 12b of the protruding portion 12 that does not contact the second tubular member 20 deforms as Figure 11 shown. In this way, deformation of the tubular portion 11 of the first tubular member 10 can be reduced. That is, deterioration of the roundness of the first tubular member 10 caused by the second tubular member 20 can be reduced.

[0088] First Example

[0089] Next, a first example, which is an example of this embodiment, will be described with reference to Figure 12 , Figure 13 and Figure 14 . Figure 12 FIG. is a perspective view showing the composite cylinder member of the first example. Figure 13 FIG. is a cross-sectional view showing the composite cylinder member of the first example. Figure 14 FIG. is an exploded perspective view showing the composite cylinder member of the first example. Note that, in the description of the first example, components that are the same as those of the first to third embodiments described above are given the same reference numerals, and their descriptions will be omitted.

[0090] As Figure 12 , Figure 13 and Figure 14 shown, in the composite cylinder member 1 of the first example AIn [the description], each of the first tubular member 10 and the second tubular member 20 has a cylindrical shape. The materials of both the first tubular member 10 and the second tubular member 20 are SUS304 (which is a metallic material). The outer diameter (i.e., diameter) of the tubular portion 11 of the first tubular member 10 is set to 140 mm, the basic thickness of the tubular portion 11 is set to 1.0 mm, and the length of the tubular portion 11 in the axial direction is set to 90 mm. The tubular portion 11 is formed to have a protruding portion 12 that protrudes from an end surface 11a on one side of the tubular portion 11 in the axial direction. Each protruding portion 12 is formed like a tab, and the protruding portions 12 are formed at intervals of 90 degrees on a circle (i.e., in the circumferential direction). That is, the protruding portions 12 are formed at four positions. In the protruding portion 12, the length of the protruding portion 12 in the axial direction is set to 20 mm, the width of the protruding portion 12 in the circumferential direction is set to 10 mm, the thickness of the base portion 12b is set to 0.2 mm, and the thickness of the distal portion 12a is set to 1.0 mm. In addition, the length of the base portion 12b in the axial direction is set to 10 mm, and the length of the distal portion 12a in the axial direction is set to 10 mm. On the other hand, in the tubular portion 21 of the second tubular member 20, the basic thickness of the tubular portion 21 is set to 1.0 mm, the outer diameter (i.e., diameter) of the tubular portion 21 is set to 142 mm, and the length of the tubular portion 21 in the axial direction is set to 80 mm.

[0091] Before the first tubular member 10 and the second tubular member 20 are connected to each other, the roundness of the tubular portion 11 of the first tubular member 10 except for the protruding portion 12 at the central position P1 in the axial direction is 0.03 mm, and the roundness of the tubular portion 21 of the second tubular member 20 at the central position P2 in the axial direction is 1.20 mm.

[0092] The connecting portion 31 between the first tubular member 10 and the second tubular member 20 is formed at a position where the distal portion 12a of the protruding portion 12 of the first tubular member 10 and the inner periphery of the tubular portion 21 of the second tubular member 20 are in contact with each other. The first tubular member 10 and the second tubular member 20 are connected to each other by injecting an adhesive into the gap between the distal portion 12a of the protruding portion 12 and the tubular portion 21 from the inner peripheral side of the tubular portion 21. After the first tubular member 10 and the second tubular member 20 are connected to each other, the roundness of the first tubular member 10 of the composite cylinder member 1 is measured at the central position P1, and the roundness of the second tubular member 20 of the composite cylinder member 1 is measured at the central position P2. A As a result, the roundness of the first tubular member 10 is 0.04 mm, and the roundness of the second tubular member 20 is 1.4. A

[0093] Comparative Example

[0094] Next, reference will be made to Figure 15 、 Figure 16 and Figure 17 to describe a comparative example for comparison with this example. Figure 15 is a perspective view showing a composite cylinder member of the comparative example. Figure 16 is a cross-sectional view showing a composite cylinder member of the comparative example. Figure 17 is an exploded perspective view showing a composite cylinder member of the comparative example. Note that also in the description of the comparative example, components identical to those of the above-described first to third embodiments and the first example are given the same reference numerals, and their description will be omitted.

[0095] In the composite cylinder member 1 of the comparative example X , the tubular portion 11 of the first tubular member 10 has the same shape and material as the tubular portion 11 of the first example, and the tubular portion 21 of the second tubular member 20 has the same shape and material as the tubular portion 21 of the first example. That is, in the comparative example, unlike the above-described first example, the first tubular member 10 does not include the protruding portion 12, and the tubular portion 11 and the tubular portion 21 are directly connected to each other in the connecting portion 31. The length of the tubular portion 11 of the first tubular member 10 in the axial direction is set to 110 mm, and the outer diameter and thickness of the tubular portion 11 are formed to be the same as those of the tubular portion 11 of the first example. The shape of the tubular portion 21 of the second tubular member 20 is formed to be exactly the same as the shape of the tubular portion 21 of the second tubular member 20 of the first example. Before the first tubular member 10 and the second tubular member 20 are connected to each other, the roundness of the first tubular member 10 and the roundness of the second tubular member 20 are the same as those in the first example.

[0096] In the composite cylinder member 1 in which the first tubular member 10 and the second tubular member 20 are connected to each other X , the inner circumference of the tubular portion 21 of the second tubular member 20 is fitted to the outer circumference of the tubular portion 11 of the first tubular member 10 by 20 mm. In this state, as in the first example, by injecting an adhesive into the gaps formed at 90-degree intervals around the circumference (in the circumferential direction), the first tubular member 10 and the second tubular member 20 are connected to each other at the four connecting portions 31. The area to which the adhesive is applied is the same as that in the first example.

[0097] In the composite cylinder member 1 in which the first tubular member 10 and the second tubular member 20 are connected to each other XAmong them, the roundness is measured. As a result, the roundness of the first tubular member 10 is 0.9 mm, while the roundness of the second tubular member 20 is 1.5 mm. Compared with the comparative example, in the first example, due to the deformation of the protruding portion 12 (especially the base portion 12b), the deformation of the tubular portion 11 of the first tubular member 10 other than the protruding portion 12 is reduced, and the deterioration of the roundness is reduced.

[0098] Second example

[0099] Next, a second example, which is an example of the present embodiment, will be described. Note that in the description of the second example, components that are the same as those of the first to third embodiments and the first example described above are given the same reference numerals, and their descriptions will be omitted.

[0100] In the composite cylinder member 1 (not shown) of the second example, different from the first example, six protruding portions 12 of the first tubular member 10 are arranged, and the six protruding portions are evenly spaced from each other in the circumferential direction. Each of the first tubular member 10 and the second tubular member 20 has a cylindrical shape. The material of both the first tubular member 10 and the second tubular member 20 is polystyrene (which is a thermoplastic resin). The outer diameter (i.e., the diameter) of the tubular portion 11 of the first tubular member 10 is set to 140 mm, the basic thickness of the tubular portion 11 is set to 1.5 mm, and the length of the tubular portion 11 in the axial direction is set to 80 mm. The tubular portion 11 is formed with a protruding portion 12 protruding from an end surface 11a on one side of the tubular portion 11 in the axial direction. Each protruding portion 12 is formed like a tab, and the protruding portions 12 are formed at intervals of 60 degrees on a circle (i.e., in the circumferential direction). That is, the protruding portions 12 are formed at six positions. In the protruding portion 12, the length of the protruding portion 12 in the axial direction is set to 20 mm, the width of the protruding portion 12 in the circumferential direction is set to 10 mm, the thickness of the base portion 12b is set to 0.8 mm, and the thickness of the distal portion 12a is set to 1.5 mm. In addition, the length of the base portion 12b in the axial direction is set to 10 mm, and the length of the distal portion 12a in the axial direction is set to 10 mm. On the other hand, in the second tubular member 20, the basic thickness of the tubular portion 21 is set to 1.5 mm, the diameter of the tubular portion 21 is set to 143 mm, and the length of the tubular portion 21 in the axial direction is set to 130 mm.

[0101] Before the first tubular member 10 and the second tubular member 20 are connected to each other, the roundness of the tubular portion 11 of the first tubular member 10 except for the protruding portion 12 is 0.02 mm at the central position P1 in the axial direction (i.e., at a position 40 mm apart from the end surface opposite to the connecting portion 31 in the axial direction). In addition, the roundness of the tubular portion 21 of the second tubular member 20 is 0.8 mm at the central position P2 in the axial direction (i.e., at a position 65 mm apart from the end surface opposite to the connecting portion 31 in the axial direction).

[0102] The connecting portion 31 between the first tubular member 10 and the second tubular member 20 is formed at a position where, in a state where the entire protruding portion 12 is inserted into the inner peripheral side of the tubular portion 21 of the second tubular member 20, the distal end portion 12a of the protruding portion 12 of the first tubular member 10 and the inner periphery of the second tubular member 20 are in contact with each other. The first tubular member 10 and the second tubular member 20 are connected to each other by injecting an adhesive into the gap between the distal end portion 12a of the protruding portion 12 and the tubular portion 21 of the second tubular member 20. After the first tubular member 10 and the second tubular member 20 are connected to each other, the roundness of each of the first tubular member 10 and the second tubular member 20 of the composite cylinder member 1 is measured. As a result, the roundness of the first tubular member 10 is 0.03 mm, while the roundness of the second tubular member 20 is 0.9 mm. Compared with the above comparative example, in the second example, since the protruding portion 12 (especially the base portion 12b) is deformed, the deformation of the tubular portion 11 of the first tubular member 10 except for the protruding portion 12 is reduced, and the deterioration of the roundness is reduced.

[0103] Third Example

[0104] Next, a third example, which is an example of the present embodiment, will be described. Note that, similarly, in the description of the third example, components that are the same as those in the first to third embodiments and the first and second examples described above are given the same reference numerals, and their descriptions will be omitted.

[0105] In the composite cylinder member 1 (not shown) of the third example, different from the second example, the thickness of the distal end portion 12a of the protruding portion 12 and the thickness of the base portion 12b of the protruding portion 12 are formed to be equal to each other and are set to 1.5 mm. That is, no gap is formed between the outer peripheral side of the protruding portion 12 and the tubular portion 21 of the second tubular member 20. In addition, the area where the adhesive is applied in the connecting portion 31 is the same as that in the second example.

[0106] Before the first tubular member 10 and the second tubular member 20 are connected to each other, the roundness of the tubular portion 11 of the first tubular member 10 except for the protruding portion 12 is 0.02 mm at the central position P1 in the axial direction (i.e., at a position 40 mm apart from the end surface opposite to the connecting portion 31 in the axial direction). In addition, the roundness of the tubular portion 21 of the second tubular member 20 is 0.8 mm at the central position P2 in the axial direction (i.e., at a position 65 mm apart from the end surface opposite to the connecting portion 31 in the axial direction).

[0107] The connecting portion 31 between the first tubular member 10 and the second tubular member 20 is formed at a position where the protruding portion 12 of the first tubular member 10 and the inner periphery of the second tubular member 20 are in contact with each other in a state where the entire protruding portion 12 is inserted into the inner peripheral side of the tubular portion 21 of the second tubular member 20. The first tubular member 10 and the second tubular member 20 are connected to each other by injecting an adhesive into the gap between the distal end portion 12a of the protruding portion 12 and the tubular portion 21 of the second tubular member 20. After the first tubular member 10 and the second tubular member 20 are connected to each other, the roundness of each of the first tubular member 10 and the second tubular member 20 of the composite cylinder member 1 is measured. As a result, the roundness of the first tubular member 10 is 0.85 mm, and the roundness of the second tubular member 20 is 1.1 mm. Therefore, compared with the above second example, in the third example, the roundness deteriorates because the base portion 12b of the protruding portion 12 is restricted by the tubular portion 21 and hardly deforms. However, compared with the above comparative example, in the third example, since the protruding portion 12 deforms, the deformation of the tubular portion 11 of the first tubular member 10 except for the protruding portion 12 is reduced, and the deterioration of the roundness is reduced.

[0108] Fourth Example

[0109] Next, reference will be made to Figure 18 、 Figure 19 and Figure 20 to describe the fourth example, which is an example of this embodiment. Figure 18 is a perspective view showing the composite cylinder member of the fourth example. Figure 19 is a cross-sectional view showing the composite cylinder member of the fourth example. Figure 20 is an exploded perspective view showing the composite cylinder member of the fourth example. Note that, similarly, in the description of the fourth example, the same components as those in the above first to third embodiments and first to third examples are given the same reference numerals, and their descriptions will be omitted.

[0110] As Figure 18 、 Figure 19 and Figure 20As shown, similarly, in the composite cylinder member 1 of the fourth example B each of the first tubular member 10 and the second tubular member 20 has a cylindrical shape. The material of the first tubular member 10 is polycarbonate containing 30% short fiber carbon and having a linear expansion coefficient of 2.2×10 -5 / °C. The outer diameter (i.e., diameter) of the tubular portion 11 of the first tubular member 10 is set to 140 mm, the basic thickness of the tubular portion 11 is set to 1.5 mm, and the length of the tubular portion 11 in the axial direction is set to 80 mm. The tubular portion 11 is formed with a protruding portion 12 protruding from the end surface 11a on one side of the tubular portion 11 in the axial direction. Each protruding portion 12 is formed like a tab, and the protruding portions 12 are formed at intervals of 90 degrees on the circle (i.e., in the circumferential direction). That is, the protruding portions 12 are formed at four positions. In the protruding portion 112, the length of the protruding portion 12 in the axial direction is set to 20 mm, the width of the protruding portion 12 in the circumferential direction is set to 10 mm, the thickness of the base portion 12b is set to 0.8 mm, and the thickness of the distal portion 12a is set to 1.5 mm.

[0111] In the tubular portion 21 of the second tubular member 20, a prepreg sheet containing 50% continuous carbon fiber and having a linear expansion coefficient of approximately 0 / °C is used as the material. The main component of the prepreg sheet is polycarbonate. The width of the prepreg sheet (i.e., the width of the tubular portion 21) is set to 10 mm, and the angle of the prepreg sheet with respect to the axial direction of the cylinder is set to 70 degrees. The braid has a two-layer structure. The basic thickness of the braid is set to 0.47 mm, the diameter of the braid is set to 140 mm, and the length of the braid in the axial direction is set to 90 mm.

[0112] Before the first tubular member 10 and the second tubular member 20 are connected to each other, the roundness of the tubular portion 11 of the first tubular member 10 except for the protruding portion 12 is 0.03 mm at the central position P1 in the axial direction. In addition, the roundness of the tubular portion 21 of the second tubular member 20 is 0.04 mm at the central position P2 in the axial direction.

[0113] The connecting portion 31 between the first tubular member 10 and the second tubular member 20 is formed at a position where the distal end portion 12a of the protruding portion 12 of the first tubular member 10 and the inner periphery of the second tubular member 20 are in contact with each other in a state where the entire protruding portion 12 is inserted into the inner peripheral side of the tubular portion 21 of the second tubular member 20. The first tubular member 10 and the second tubular member 20 are connected to each other by injecting an adhesive into the gap between the distal end portion 12a of the protruding portion 12 and the tubular portion 21 of the second tubular member 20. After connecting the first tubular member 10 and the second tubular member 20 to each other, the roundness of each of the first tubular member 10 and the second tubular member 20 of the composite cylinder member 1 B is measured. As a result, the roundness of the first tubular member 10 is 0.04 mm, and the roundness of the second tubular member 20 is 0.05 mm. In addition, in the state where the composite cylinder member 1 B in which the first tubular member 10 and the second tubular member 20 are connected to each other is exposed to a high-temperature environment, the roundness of the first tubular member 10 is 0.04 mm, and the roundness of the second tubular member 20 is 0.05 mm. In addition, in the state where the composite cylinder member 1 B in which the first tubular member 10 and the second tubular member 20 are connected to each other is exposed to a low-temperature environment, the roundness of the first tubular member 10 is 0.04 mm, and the roundness of the second tubular member 20 is 0.05 mm. Compared with the above comparative example, in the fourth example, since the protruding portion 12 (particularly the base portion 12b) is deformed, the deformation of the tubular portion 11 of the first tubular member 10 other than the protruding portion 12 is extremely small, and the deterioration of the roundness is reduced.

[0114] Fifth Example

[0115] Next, reference will be made to Figure 21 、 Figure 22 and Figure 23 to describe the fifth example, which is an example of this embodiment. Figure 21 is a perspective view showing the composite cylinder member of the fifth example. Figure 22 is a cross-sectional view showing the composite cylinder member of the fifth example. Figure 23 is an exploded perspective view showing the composite cylinder member of the fifth example. Note that, similarly, in the description of the fifth example, the same components as those in the above first to third embodiments and first to fourth examples are given the same reference numerals, and their descriptions will be omitted.

[0116] As Figure 21 、 Figure 22 and Figure 23 shown, in the composite cylinder member 1 of the fifth example CIn [the fifth example], unlike the composite cylinder member of the fourth example, the thickness of the distal end portion 12a of the protruding portion 12 and the thickness of the base portion 12b of the protruding portion 12 are formed to be equal to each other, and are set to 1.5 mm. That is, no gap is formed between the outer peripheral side of the protruding portion 12 and the tubular portion 21 of the second tubular member 20. Further, in the fifth example, the length of the tubular portion 11 of the first tubular member 10 in the axial direction is set to 100 mm, and the other shapes are formed to be the same as the shape of the tubular portion 11 of the fourth example. Further, the area to which the adhesive is applied in the connecting portion 31 is also the same as that in the fourth example.

[0117] The connecting portion 31 between the first tubular member 10 and the second tubular member 20 is formed at a position where the protruding portion 12 of the first tubular member 10 and the inner periphery of the second tubular member 20 are in contact with each other in a state where the entire protruding portion 12 is inserted into the inner peripheral side of the tubular portion 21 of the second tubular member 20. The first tubular member 10 and the second tubular member 20 are connected to each other by injecting an adhesive into the gap between the distal end portion 12a of the protruding portion 12 and the tubular portion 21 of the second tubular member 20.

[0118] After connecting the first tubular member 10 and the second tubular member 20 to each other, the roundness of each of the first tubular member 10 and the second tubular member 20 of the composite cylinder member 1 C is measured. As a result, the roundness of the first tubular member 10 is 0.04 mm, and the roundness of the second tubular member 20 is 0.04 mm, which is almost no difference from the roundness in the above-mentioned fourth example. Further, in the state where the composite cylinder member 1 of the fifth example C is exposed to a high-temperature environment, the roundness of the first tubular member 10 is 0.8 mm, and the roundness of the second tubular member 20 is 0.09 mm. Further, in the state where the composite cylinder member 1 of the fifth example C is exposed to a low-temperature environment, the roundness of the first tubular member 10 is 0.9 mm, and the roundness of the second tubular member 20 is 0.08 mm.

[0119] In the above fourth and fifth examples, since the roundness of the single body of the first tubular member 10 in the fourth example is almost equal to the roundness of the single body of the first tubular member 10 in the fifth example, and the roundness of the single body of the second tubular member 20 in the fourth example is almost equal to the roundness of the single body of the second tubular member 20 in the fifth example, after the first tubular member 10 and the second tubular member 20 are connected to each other, the change in the roundness of the composite cylinder member 1 is small. However, in a low-temperature or high-temperature environment, in the fourth example where the base portion 12b of the protruding portion 12 is deformed, the deterioration of the roundness is more reduced. On the other hand, in the fifth example, since the protruding portion 12 is restricted by the tubular portion 21, there is no gap that allows the base portion 12b to deform. Therefore, the size of the entire composite cylinder member 1 is changed by the temperature change, resulting in deterioration of the roundness. However, in the fifth example, since the protruding portion 12 is formed, the deformation of the composite cylinder member 1 caused by connecting the first tubular member 10 and the second tubular member 20 is reduced, especially in a normal-temperature environment. C The size of C the composite cylinder member 1 caused by connecting the first tubular member 10 and the second tubular member 20 is changed by the temperature change, resulting in deterioration of the roundness. However, in the fifth example, since the protruding portion 12 is formed, the deformation of the composite cylinder member 1 caused by connecting the first tubular member 10 and the second tubular member 20 is reduced, especially in a normal-temperature environment.

[0120] Sixth Example

[0121] Next, the sixth example, which is an example of this embodiment, will be described with reference to Figure 24 , Figure 25 and Figure 26 . Figure 24 FIG. is a perspective view showing the composite cylinder member of the sixth example. Figure 25 FIG. is a cross-sectional view showing the composite cylinder member of the sixth example. Figure 26 FIG. is an exploded perspective view showing the composite cylinder member of the sixth example. Note that, similarly, in the description of the sixth example, the same components as those in the above first to third embodiments and first to fifth examples are given the same reference numerals, and their descriptions will be omitted.

[0122] As Figure 24 , Figure 25 and Figure 26 shown, similarly, in the composite cylinder member 1 D of the sixth example, each of the first tubular member 10 and the second tubular member 20 has a cylindrical shape. The material and shape (dimensions) of the first tubular member 10 are the same as the material and shape (dimensions) of the first tubular member 10 in the above fourth and fifth examples, and the material and shape (dimensions) of the second tubular member 20 are the same as the material and shape (dimensions) of the second tubular member 20 in the above fourth and fifth examples.

[0123] The connecting portion 31 between the first tubular member 10 and the second tubular member 20 is formed at a position where, with the entire protruding portion 12 inserted into the inner circumferential side of the tubular portion 21 of the second tubular member 20, the distal end portion 12a of the protruding portion 12 of the first tubular member 10 and the inner circumference of the second tubular member 20 are in contact with each other. In the connecting portion 31, the first tubular member 10 and the second tubular member 20 are connected to each other by thermally welding the distal end portion 12a of the protruding portion 12 and the inner circumferential surface of the tubular portion 21 of the second tubular member 20. During thermal welding, in order to connect the first tubular member 10 and the second tubular member 20, a rod-shaped jig with a diameter of 5 mm is heated to 300 °C and the jig is pressed against the outer circumference of the second tubular member 20 with a force of 10 kg in the inner and outer diameter directions for 5 seconds, causing the polycarbonate of the first tubular member 10 and the polycarbonate of the second tubular member 20 to melt and mix with each other.

[0124] In the sixth example, the jig is pressed against the connecting portion 31 from the side of the second tubular member 20. Since the second tubular member 20 is made of CFRTP containing continuous fibers with high thermal conductivity, heat is conducted to the distal end portion 12a of the protruding portion 12 of the first tubular member 10 made of other thermoplastic resin. As a result, in the sixth example, an adhesive force stronger than the adhesive force generated by the adhesive in the above first to fifth examples is generated.

[0125] After connecting the first tubular member 10 and the second tubular member 20 to each other, the roundness of each of the first tubular member 10 and the second tubular member 20 of the composite cylinder member 1 D is measured. As a result, the roundness of the first tubular member 10 is 0.04 mm, and the roundness of the second tubular member 20 is 0.05 mm. In addition, in a state where the composite cylinder member 1 D in which the first tubular member 10 and the second tubular member 20 are connected to each other is exposed to a high-temperature environment, the roundness of the first tubular member 10 is 0.04 mm, and the roundness of the second tubular member 20 is 0.05 mm. In addition, in the composite cylinder member 1 D in a state where it is exposed to a low-temperature environment, the roundness of the first tubular member 10 is 0.04 mm, and the roundness of the second tubular member 20 is 0.05 mm. Compared with the above comparative example, in the sixth example, since the protruding portion 12 (especially the base portion 12b) is deformed, the deformation of the tubular portion 11 of the first tubular member 10 other than the protruding portion 12 is extremely small, and the deterioration of the roundness is reduced.

[0126] Seventh example

[0127] Next, reference will be made to Figure 27 、 Figure 28 and Figure 29Describe the seventh example, which is an example of this embodiment. Figure 27 is a perspective view of the composite cylinder member showing the seventh example. Figure 28 is a cross-sectional view of the composite cylinder member showing the seventh example. Figure 29 is an exploded perspective view of the composite cylinder member showing the seventh example. Note that, similarly, in the description of the seventh example, components that are the same as those in the above-described first to third embodiments and first to sixth examples are given the same reference numerals, and their descriptions will be omitted.

[0128] As Figure 27 , Figure 28 and Figure 29 shown, in the composite cylinder member 1 E of the seventh example, different from the composite cylinder member of the above-described sixth example, the thickness of the distal portion 12a of the protruding portion 12 and the thickness of the base portion 12b of the protruding portion 12 are formed to be equal to each other and are set to 1.5 mm. That is, no gap is formed between the outer peripheral side of the protruding portion 12 and the tubular portion 21 of the second tubular member 20. Further, in the seventh example, the length of the tubular portion 11 of the first tubular member 10 in the axial direction is set to 100 mm, and the other shapes are formed to be the same as the shape of the tubular portion 11 of the sixth example.

[0129] The connecting portion 31 between the first tubular member 10 and the second tubular member 20 is formed at a position where the protruding portion 12 of the first tubular member 10 and the inner periphery of the second tubular member 20 are in contact with each other in a state where the entire protruding portion 12 is inserted into the inner peripheral side of the tubular portion 21 of the second tubular member 20. Further, as in the above-described sixth example, the composite cylinder member 1 E (i.e., the first tubular member 10 and the second tubular member 20 are connected to each other) is formed by performing thermal welding at four connecting portions 31 formed at intervals of 90 degrees around a circle (i.e., in the circumferential direction). The jig, state, processing conditions, and method of thermal welding are the same as those in the above-described sixth example.

[0130] Similarly, in the seventh example, the jig is pressed against the connecting portion 31 from the side of the second tubular member 20. Since the second tubular member 20 is made of CFRTP containing continuous fibers having high thermal conductivity, heat is conducted to the distal portion 12a of the protruding portion 12 of the first tubular member 10 made of other thermoplastic resin. As a result, in the seventh example, an adhesive force stronger than the adhesive force generated by the adhesive in the above-described first to fifth examples is generated.

[0131] After connecting the first tubular member 10 and the second tubular member 20 to each other, the composite cylinder member 1 EThe roundness of each of the first tubular member 10 and the second tubular member 20. As a result, the roundness of the first tubular member 10 is 0.04 mm, and the roundness of the second tubular member 20 is 0.04 mm, which is almost no difference from the roundness in the above sixth example. In addition, in the composite cylinder member 1 of the seventh example E In a state of being exposed to a high-temperature environment, the roundness of the first tubular member 10 is 0.8 mm, and the roundness of the second tubular member 20 is 0.09 mm. In addition, in the composite cylinder member 1 of the seventh example E In a state of being exposed to a low-temperature environment, the roundness of the first tubular member 10 is 0.9 mm, and the roundness of the second tubular member 20 is 0.08 mm.

[0132] In the above sixth and seventh examples, since the roundness of the first tubular member 10 alone in the sixth example is almost equal to the roundness of the first tubular member 10 alone in the seventh example, and the roundness of the second tubular member 20 alone in the sixth example is almost equal to the roundness of the second tubular member 20 alone in the seventh example, after the first tubular member 10 and the second tubular member 20 are connected to each other, the change in the roundness of the composite cylinder member 1 is small. However, in a high-temperature or low-temperature environment, in the sixth example where the base portion 12b of the protruding portion 12 is deformed, the deterioration of the roundness is more reduced. On the other hand, in the seventh example, since the protruding portion 12 is restricted by the tubular portion 21, there is no gap allowing the base portion 12b to deform. Therefore, the size of the entire composite cylinder member 1 is changed by the temperature change E such that the roundness deteriorates. However, in the seventh example, since the protruding portion 12 is formed, the deformation of the composite cylinder member 1 caused by connecting the first tubular member 10 and the second tubular member 20 is reduced, especially in a normal-temperature environment. E

[0133] Fourth Embodiment

[0134] Hereinafter, reference will be made to Figure 30 and Figure 31 to describe a fourth embodiment for implementing the present disclosure. Figure 30 is a front view showing the composite cylinder member of the fourth embodiment. Figure 31 is a perspective view showing the composite cylinder member of the fourth embodiment. The composite cylinder member 1 of the fourth embodiment 4 includes a base member 40, a first tubular member 10, and a second tubular member 20. However, in Figure 31 it, the base member 40 is not shown.

[0135] For example, in a cylindrical connecting member in which two cylindrical members having different coefficients of linear expansion are connected to each other, stress generated due to differences in the coefficients of linear expansion caused by temperature changes may cause deterioration of the accuracy of the members. Therefore, Japanese Patent Application Laid-Open No. H9-303707 proposes a structure in which two members abut against each other such that the sliding surfaces of the members (i.e., the sliding outer surface and the sliding inner surface) slide on each other along the direction in which the members expand due to thermal expansion. In addition, Japanese Patent Application Laid-Open No. 2009-278823 proposes a structure in which a gap is formed to absorb the influence caused by differences in expansion between two members.

[0136] In the above-described structure in which the sliding surfaces of two members abut against each other such that the sliding surfaces slide on each other, expansion (contraction) of the members caused by thermal expansion (thermal contraction) is allowed to a certain extent. However, since the expansion (contraction) is borne by the sliding surfaces, deterioration of accuracy may occur due to thermal expansion. On the other hand, in a structure in which a gap is formed between two members to prevent the influence caused by differences in thermal expansion (thermal contraction) between the members, although deterioration of accuracy caused by thermal expansion (thermal contraction) can be prevented, the members may wobble. The embodiments and examples described below are intended to provide a connecting member and a method of manufacturing the connecting member that can prevent deterioration of accuracy and reduce wobbling when a first cylindrical member and a second cylindrical member having different coefficients of linear expansion are connected to each other.

[0137] As Figure 30 and Figure 31 shown, the composite cylindrical member 1 4 serving as a connecting member in the fourth embodiment is an external member that constitutes a lens barrel or a hood of an interchangeable lens for a single-lens reflex camera, for example. The composite cylindrical member 1 4 includes a base member 40, two first tubular members 10, and a second tubular member 20, which are coaxially arranged on a central axis AX. The base member 40 is a cylindrical housing (i.e., a lens barrel) of an optical device that houses a plurality of optical lenses. The two first tubular members 10 and the second tubular member 20 are supported by the base member 40. In particular, the second tubular member 20 is supported such that the second tubular member 20 is held by the two first tubular members 10 from the outside in the axial direction. The first tubular member 10 is a molded body made of a material such as resin, and its coefficient of linear expansion is higher than that of the second tubular member 20. That is, the first tubular member 10 is a high coefficient of linear expansion molded body. On the contrary, the second tubular member 20 is a molded body made of a material such as resin, and its coefficient of linear expansion is lower than that of the first tubular member 10. That is, the second tubular member 20 is a low coefficient of linear expansion molded body.

[0138] The first tubular member 10 includes a cylindrical tubular portion 11. On the outer peripheral side of the tubular portion 11, a first end surface 11s is formed to face the axial direction. In addition, as Figure 31 shown, on the inner peripheral side of the tubular portion 11 relative to the first end surface 11s, an inner peripheral tubular portion 14 is integrally formed with the tubular portion 11 and extends in the axial direction from the first end surface 11s toward the second tubular member 20. In other words, on the outer peripheral side of the inner peripheral tubular portion 14, the first end surface 11s is formed like a step in the tubular portion 11. In addition, protruding portions 13 are formed in the tubular portion 11 of the first tubular member 10 so as to protrude in the axial direction from the first end surface 11s, and each protruding portion 13 has a convex shape. The protruding portions 13 are evenly spaced from each other in the circumferential direction and are formed, for example, at four positions (at intervals of 90 degrees).

[0139] The second tubular member 20 includes a cylindrical tubular portion 21. The tubular portion 21 is loosely fitted onto the outer periphery of the inner peripheral tubular portion 14 of the first tubular member 10. That is, if the inner peripheral tubular portion 14 of the first tubular member 10 and the tubular portion 21 of the second tubular member 20 are fitted to each other without a gap, stress caused by a difference in the amount of expansion due to temperature change may cause deterioration of accuracy (roundness). Therefore, a minute gap is formed between the inner peripheral tubular portion 14 of the first tubular member 10 and the tubular portion 21 of the second tubular member 20, and the inner peripheral tubular portion 14 of the first tubular member 10 and the tubular portion 21 of the second tubular member 20 are loosely fitted to each other.

[0140] On one end of the tubular portion 21 of the second tubular member 20 in the axial direction, a second end surface 21s is formed. The second end surface 21s and the above-mentioned first end surface 11s are arranged to face each other in the axial direction in a state where the first tubular member 10 and the second tubular member 20 are connected to each other, and a gap dz is formed in the axial direction (i.e., the Z1-Z2 direction). The gap dz serves as the first gap. In other words, the first tubular member 10 and the second tubular member 20 are connected to each other by holding the base member 40 of the first tubular member 10 and the second tubular member 20, so that a gap dz is formed between the second end surface 21s and the above-mentioned first end surface 11s. Therefore, the first tubular member 10 and the second tubular member 20 have a gap dz formed between the first tubular member 10 and the second tubular member 20 in the axial direction (the axial direction is the direction in which the first end surface 11s and the second end surface 21s face each other). In addition, the first tubular member 10 and the second tubular member 20 are loosely fitted to each other, so that a gap (not shown) is formed between the first tubular member 10 and the second tubular member 20 in the circumferential direction. Therefore, the first tubular member 10 and the second tubular member 20 can move relative to each other in the axial direction and the inner and outer diameter directions. That is, even if the first tubular member 10 (which is a high linear expansion coefficient molded body) thermally expands or contracts, the first tubular member 10 and the second tubular member 20 will not interfere with each other and will not affect the accuracy.

[0141] In addition, in the above-mentioned second end surface 21s, a recessed portion 23 recessed in the axial direction is formed. Each recessed portion 23 is fitted into a corresponding protruding portion among the above-mentioned protruding portions 13, and the recessed portion 23 and the protruding portion 13 form a fitting portion 35. Specifically, when viewed in the radial direction, the protruding portion 13 of the first tubular member 10 has a semicircular shape, and when viewed in the radial direction, the recessed portion 23 is formed to have a triangular shape. That is, the recessed portion 23 includes two inclined surfaces, and these two inclined surfaces form a shape that becomes wider in the direction in which the shape opens when viewed in the radial direction. Therefore, the protruding portion 13 and the recessed portion 23 are fitted to each other, so that the contact portions 13a and 13a (which are two arc-shaped surfaces) of the protruding portion 13 are in contact with the contact portions 23a and 23a (which are two inclined surfaces) of the recessed portion 23. In this way, in the fitting portion 35, the first tubular member 10 and the second tubular member 20 are joined to each other, so that the protruding portion 13 of the first tubular member 10 and the recessed portion 23 of the second tubular member 20 are fitted to each other. Therefore, even if the gap dz is formed as described above, it is possible to prevent the first tubular member 10 and the second tubular member 20 from swaying in the axial direction (i.e., the Z1-Z2 direction) and the circumferential direction (i.e., the W1-W2 direction).

[0142] For example, in the composite cylinder member 1 4 when exposed to a high-temperature environment (the temperature of the composite cylinder member 1 4 increases), the base member 40 and the first tubular member 10 having a high coefficient of linear expansion expand, while the second tubular member 20 having a low coefficient of linear expansion hardly expands (or may slightly contract). In this case, the two first tubular members 10 supported by the base member 40 move relative to each other in the axial direction in the direction in which the two first tubular members 10 are separated from the second tubular member 20. However, since mainly the protruding portion 13 expands, the contact state between the protruding portion 13 and the recessed portion 23 is maintained. That is, the mating state is maintained.

[0143] Conversely, in the composite cylinder member 1 4 when exposed to a low-temperature environment (the temperature of the composite cylinder member 1 4 decreases), the base member 40 and the first tubular member 10 having a high coefficient of linear expansion contract, while the second tubular member 20 having a low coefficient of linear expansion hardly contracts (or may slightly expand). In this case, the two first tubular members 10 supported by the base member 40 move relative to each other in the axial direction in the direction in which the two first tubular members 10 move closer to the second tubular member 20. However, since mainly the protruding portion 13 contracts, the contact state is maintained without generating excessive pressure on the recessed portion 23. That is, the mating state is maintained.

[0144] As described above, in the composite cylinder member 1 of the fourth embodiment 4 since there are gaps between the first tubular member 10 and the second tubular member 20 in both the axial direction and the inner and outer diameter directions, it is possible to prevent the accuracy (roundness) from being affected by thermal expansion or thermal contraction. In addition, even if a gap is formed between the first tubular member 10 and the second tubular member 20, in both the high-temperature environment and the low-temperature environment, the protruding portion 13 and the recessed portion 23 are mated with each other in the mating portion 35. Therefore, the occurrence of wobbling can be reduced. In particular, even when the first tubular member 10 contracts in the direction of moving closer to the second tubular member 20 in a low-temperature environment, the protruding portion 13 also contracts. Therefore, no excessive pressure is generated on the recessed portion 23, and the influence on the accuracy (roundness) can be prevented.

[0145] Note that preferably, the second tubular member 20 (which is a molded body with a low coefficient of linear expansion) is a continuous carbon fiber-reinforced molded resin body. The type of fiber of the continuous carbon fiber-reinforced molded resin body can be any material, such as carbon fiber, glass fiber, boron fiber, or organic fiber (e.g., aramid fiber). Additionally, the type of resin impregnator of the continuous carbon fiber-reinforced molded resin body can be any resin impregnator. That is, if the resin impregnator is a thermoplastic resin, the type of resin impregnator of the continuous carbon fiber-reinforced molded resin body can be polyamide resin (PA), polycarbonate resin (PC), acrylic resin (PMMA), polyetheretherketone (PEEK), polyphenylene sulfide (PPS), or polypropylene (PP). In other cases, if the resin impregnator is a thermosetting resin, the type of resin impregnator can be epoxy resin, phenolic resin, unsaturated polyester resin, or vinyl ester resin. More preferably, the type of resin impregnator of the continuous carbon fiber-reinforced molded resin body is PC to impart excellent strength and toughness to the continuous carbon fiber-reinforced resin. In this case, a sizing agent can be used to increase the affinity between the continuous carbon fiber and the resin impregnator, and preferably, the continuous carbon fiber bundle is fibrillated.

[0146] Additionally, preferably, the first tubular member 10 (which is a molded body with a high coefficient of linear expansion) is a molded resin product. Preferably, the material of the molded resin product is any type of thermoplastic resin, such as PA, PC, PMMA, PEEK, PPS, or PP. If the molded resin product is made of a fiber-reinforced resin containing 10% to 30% of short glass fibers or carbon fibers, the strength of the molded resin product can be increased.

[0147] In the composite cylinder member 1 of the fourth embodiment 4 four protruding portions 13 are formed in the first tubular member 10, and four recessed portions 23 are formed in the second tubular member 20. However, the present disclosure is not limited thereto. That is, the number of each of the protruding portions 13 and the recessed portions 23 can be any number as long as three or more protruding portions 13 and three or more recessed portions 23 are formed so that three points (and other points) of each of the first tubular member 10 and the second tubular member 20 are fixed in a plane orthogonal to the axial direction.

[0148] Fifth embodiment

[0149] Next, reference will be made to Figure 32A and Figure 32B to describe the fifth embodiment. In the fifth embodiment, a part of the above-described fourth embodiment is changed. Figure 32A is a front view showing the composite cylinder member of the fifth embodiment. Figure 32B is along Figure 32AA cross-sectional view taken along the line indicated by arrow A-A in []. Note that in the description of the fifth embodiment, components identical to those of the fourth embodiment described above are given the same reference numerals, and their descriptions will be omitted.

[0150] As Figure 32A and Figure 32B shown, different from the composite cylinder member 1 of the fourth embodiment 4 in the fifth embodiment, in the composite cylinder member 1 used as a connecting member 5 the first tubular member 10 and the second tubular member 20 are connected to each other in the connecting portion 33.

[0151] Specifically, as Figure 32A shown, in the composite cylinder member 1 5 the position Y is located at the position where the imaginary plane VS1 including one of the two inclined surfaces (i.e., the contact portion 23a) of the recessed portion 23 and the imaginary plane VS2 including the other inclined surface (i.e., the contact portion 23a) of the recessed portion 23 intersect. As Figure 32B shown, the connecting portion 33 is disposed on the inner peripheral side of a part of the tubular portion 21 formed at the position Y. That is, by injecting an adhesive into the gap dd formed between the inner peripheral tubular portion 14 of the tubular portion 21 of the second tubular member 20 and the tubular portion 11 of the first tubular member 10 in the inner and outer diameter directions, the connecting portion 33 is formed on the inner peripheral side of the said part formed at the position Y. The gap dd serves as the second gap. Note that the first tubular member 10 and the second tubular member 20 can be connected to each other in the connecting portion 33 while applying pressure to the first tubular member 10 and the second tubular member 20 in the axial direction (i.e., the Z1-Z2 direction) to such an extent that the protruding portion 13 and the recessed portion 23 are not damaged.

[0152] That is, in the case where the first tubular member 10 and the second tubular member 20 are held only by the base member 40 (see Figure 30 ), if a force is applied to the first tubular member 10 in the circumferential direction (i.e., the W1-W2 direction) with respect to the second tubular member 20, the recessed portion 23 may be disengaged from the protruding portion 13. However, in the composite cylinder member 1 of the fifth embodiment 5In this case, even if a force is applied to the first tubular member 10 in the circumferential direction (i.e., the W1-W2 direction), the protruding portion 13 and the recessed portion 23 can be prevented from separating by being connected in the connecting portion 33. In contrast, in the case where the connecting portion is formed at a position other than the position Y, if a force is applied to the first tubular member 10 in the circumferential direction, a rotational moment is generated with the connecting portion as a fulcrum, making it easy for the recessed portion to separate from the protruding portion 13. However, since the first tubular member 10 and the second tubular member 20 are connected to each other at the position Y, even if a force is applied to the first tubular member 10 in the circumferential direction, the rotational moment can be received by the inclined surface of the recessed portion 23. Therefore, the contact portion 13a of the protruding portion 13 becomes difficult to separate from the contact portion 23a of the recessed portion 23.

[0153] Note that in the composite cylinder member 1 of the fifth embodiment 5 the first tubular member 10 and the second tubular member 20 are connected to each other by an adhesive in the connecting portion 33. However, the present disclosure is not limited thereto. For example, a boss-like portion may be formed on a part of the inner circumferential tubular portion 14 of the first tubular member 10 formed at the position Y, and the boss-like portion and the second tubular member 20 may be heat-sealed to each other.

[0154] Sixth Embodiment

[0155] Next, reference will be made to Figure 33A and Figure 33B to describe the sixth embodiment. In the sixth embodiment, a part of the above-described fourth embodiment is changed. Figure 33A is a front view showing the composite cylinder member of the sixth embodiment. Figure 33B is a cross-sectional view taken along the line indicated by the arrow B-B in Figure 33A . Note that in the description of the sixth embodiment, components that are the same as those of the above-described fourth embodiment are given the same reference numerals, and their descriptions will be omitted.

[0156] As Figure 33A and Figure 33B shown, different from the composite cylinder member 1 of the fourth embodiment 4 in the composite cylinder member 1 serving as a connecting member in the sixth embodiment 6 an elastic member 34 is disposed between the first tubular member 10 and the second tubular member 20.

[0157] Specifically, as Figure 33A and Figure 33B shown, in the composite cylinder member 1 6In [the structure], the elastic member 34 is disposed in the gap dd formed between the inner peripheral surface of the tubular portion 21 of the second tubular member 20 and the outer peripheral surface of the inner peripheral tubular portion 14 of the tubular portion 11 of the first tubular member 10 in the inner and outer diameter directions. That is, the elastic member 34 is disposed to surround the portions of the first tubular member 10 and the second tubular member 20 other than the fitting portion 35 in the circumferential direction; and the state allowing the first tubular member 10 and the second tubular member 20 to move relative to each other within a predetermined distance range is maintained by the elastic deformation of the elastic member 34.

[0158] If the Shore A hardness (Type A durometer) of the rubber hardness of the elastic member 34 is less than 20 degrees, the user will have a sense of gap when holding the outer member of the lens barrel because the elastic member is too soft. Therefore, the grade of the lens barrel will deteriorate. On the contrary, if the Shore A hardness of the rubber hardness of the elastic member 34 is higher than 80 degrees, when the temperature changes, the stress generated by the difference in the linear expansion amount between the first tubular member 10 and the second tubular member 20 is transmitted to the first tubular member 10 or the second tubular member 20. This is because the elastic member 34 has a high elastic modulus. Therefore, the accuracy will deteriorate. The relationship among the Shore A hardness of the rubber hardness, the deterioration of the accuracy caused by temperature change, and the sense of gap felt by the user when holding the outer member is shown in Table 1 below.

[0159] Table 1

[0160]

[0161] As shown in Table 1, preferably, the Shore A hardness (which is used as the rubber hardness) of the elastic member 34 is in the range of 20 to 80 degrees. In this way, the grade of the outer member of the lens barrel can be maintained at a high level, and the deterioration of the accuracy can be prevented.

[0162] Note that if the material of the elastic member 34 is rubber or the like, the material can be any rubber material, such as natural rubber (NR), styrene-butadiene rubber (SBR), nitrile rubber (NBR), ethylene propylene rubber (EPDM), silicone rubber, fluororubber, or polyurethane rubber.

[0163] In other cases, the elastic member 34 can have adhesiveness and connect the first tubular member 10 and the second tubular member 20. In this case, preferably, the elastic member 34 is formed at the position Y as in the fifth embodiment above (see Figure 32A and Figure 32B ) and the portion on the inner peripheral side has adhesiveness.

[0164] Eighth Example

[0165] Next, reference will be made to Figure 34A 、 Figure 34BAnd Figure 35 Describe the eighth example, which is an example of the above-mentioned sixth embodiment. Figure 34A FIG. is a front view of the composite cylinder member showing the eighth example. Figure 34B Is along Figure 34A The cross-sectional view taken along the line indicated by arrow C-C in Figure 35 FIG. is a perspective view showing an example of the braiding device. Note that in the description of the eighth example, the components identical to those of the above-mentioned fourth and sixth embodiments are given the same reference numerals, and their descriptions will be omitted.

[0166] First, a method of manufacturing the second tubular member 20 will be described with reference to Figure 35 That is, a method of manufacturing a continuous carbon fiber reinforced molded resin body used as a molded body with a low coefficient of linear expansion.

[0167] As Figure 35 Shown, the braiding device 100 includes an annular frame 121 having a through hole 122 formed therein, a mandrel 128 inserted into the through hole 122, and a guide ring 127 disposed around the outer periphery of the mandrel 128. The annular frame 121 includes a moving mechanism (not shown) that moves a plurality of carriers 123 along an 8-shaped trajectory 124. The plurality of carriers 123 supply continuous carbon fiber reinforced resin tapes 125 and 126.

[0168] Specifically, each carrier 123 includes a spool (not shown), and the continuous carbon fiber reinforced resin tapes 125 or 126 are pre-wound around the spool. The continuous carbon fiber reinforced resin tapes 125 and 126 pre-wound around the spool are pulled out from the carrier 123, bent in the direction of a desired braiding angle through the guide ring 127, and guided toward the mandrel 128. Note that each carrier 123 includes a mechanism (not shown) that generates tension by using spring force or the like. By this tension, the continuous carbon fiber reinforced resin tapes 125 and 126 are wound around the mandrel 128 such that the continuous carbon fiber reinforced resin tapes 125 and 126 are arranged with each other.

[0169] In addition, the plurality of carriers 123 move along the 8-shaped trajectory 124 formed on the annular frame 121. That is, the direction in which half of the carriers 123 move is opposite to the direction in which the other half of the carriers 123 move. For example, the rotational trajectory of the carrier 123-1 is opposite to the rotational trajectory of the carrier 123-2. As the carriers move, the continuous carbon fiber reinforced resin tapes 125 and 126 intersect with each other, so that a continuous carbon fiber reinforced resin layer 129 is formed on the mandrel 128.

[0170] In this example, the width of each of the continuous carbon fiber reinforced resin tapes 125 and 126 is set to 9 mm, and the VF value (i.e., fiber volume content) of each of the continuous carbon fiber reinforced resin tapes 125 and 126 is set to 50%. Additionally, during braiding, since each of the continuous carbon fiber reinforced resin tapes 125 and 126 needs to be flexible, the state of each of the continuous carbon fiber reinforced resin tapes 125 and 126 is set to a semi-impregnated state. The density in the semi-impregnated state is set to a value within the range of 50% to 60%. The resin impregnating agent contained in the continuous carbon fiber reinforced resin tapes 125 and 126 is PC with a viscosity-average molecular weight of 20,000. The continuous carbon fiber reinforced resin tapes 125 and 126 are manufactured by forming a prepreg sheet and cutting the sheet into tapes. The prepreg sheet is manufactured by placing a continuous carbon fiber sheet material (whose continuous carbon fibers are fibrillated) and a PC film between heating rollers or the like to integrate the continuous carbon fiber sheet material and the PC film with each other.

[0171] Then, an impregnation process is performed. In the impregnation process, the continuous carbon fiber reinforced resin layer 129 is heated by using a heating unit (not shown), and then the resin impregnating agent contained in the continuous carbon fiber reinforced resin tapes 125 and 126 is melted and impregnated into the space between the fibers by using a pressing unit (not shown). After that, the continuous carbon fiber reinforced resin layer 129 is cooled in the impregnation process, thereby forming the second tubular member 20 as a continuous carbon fiber reinforced molded resin body (i.e., a molded body with a low coefficient of linear expansion). Then, the second tubular member 20 as the continuous carbon fiber reinforced molded resin body is removed from the mandrel 128, and six recessed portions 23 are formed on each side in the circumferential direction of the second tubular member 20 by cutting the end surfaces on both sides of the tubular portion 21 in the axial direction by using a machine tool.

[0172] Next, a method for manufacturing the first tubular member 10 (which is a molded body with a high coefficient of linear expansion) will be described. The first tubular member 10 is a molded resin product. The first tubular member 10 is manufactured by injection molding using a mold (not shown). Additionally, six protruding portions 13 including contact portions 13a are formed in the circumferential direction by using the shape of the mold, and each contact portion has an arc-shaped surface. The material of the molded resin product is PC containing 30% of short glass fibers (i.e., Panlite G-3430H manufactured by TEIJIN LIMITED).

[0173] As Figure 34A shown, in the composite cylinder member 1 of the eighth example FIn the state where the second tubular member 20 is held by the two first tubular members 10, the two first tubular members 10 and the second tubular member 20 are supported by a base member (not shown). The second tubular member 20 includes a large diameter portion 21A having a diameter of 100 mm, a small diameter portion 21C having a diameter of 90 mm and smaller than the diameter of the large diameter portion 21A, and a tapered portion 21B having a tapered shape formed to connect the large diameter portion 21A and the small diameter portion 21C.

[0174] In a state where the protruding portion 13 of one of the two first tubular members 10 abuts against and fits into the recessed portion 23 formed in one of the two end portions of the tubular portion 21 of the second tubular member 20 and the protruding portion 13 of the other of the two first tubular members 10 abuts against and fits into the recessed portion 23 formed in the other of the two end portions of the tubular portion 21 of the second tubular member 20, the two first tubular members 10 and the second tubular members 20 are connected to each other to form the composite tube member 1 F . In order to connect the two first tubular members 10 and the second tubular member 20, an adhesive elastic member 34 is arranged between the inner peripheral tubular portion 14 of the first tubular member 10 and the tubular portion 21 of the second tubular member 20. Note that the gap dz between the end surface 11a of the tubular portion 11 of the first tubular member 10 and the end surface 21a of the tubular portion 21 of the second tubular member 20 is set to 0.2 mm. In addition, the elastic member 34 used is a silicone adhesive having a Shore A hardness of 43 degrees in rubber hardness (i.e., an elastic adhesive SuperX manufactured by CEMEDINE CO., LTD.).

[0175] Due to the composite cylinder member 1 of the eighth example F Since it is formed as described above, even when the temperature changes, the deterioration of the accuracy caused by thermal expansion is prevented, and the occurrence of shaking is reduced.

[0176] Variation Example

[0177] Next, a modification of the fitting portion 35 (ie, the protruding portion 13 and the recessed portion 23) of the fourth to sixth embodiments and the eighth example will be described with reference to FIG. 36. Figure 36A It is a schematic diagram showing the protruding portion and the recessed portion of the composite tube member of the fourth embodiment. Figure 36B It is a schematic diagram showing the protruding portion and the recessed portion of the composite cylinder member of the first modification. Figure 36C It is a schematic diagram showing the protruding portion and the recessed portion of the composite cylinder member of the second modification. Figure 36D It is a schematic diagram showing the protruding portion and the recessed portion of the composite cylinder member of the third modification. Figure 36ESchematic diagram showing the protruding portion and the recessed portion of the composite cylinder member of the fourth modification. Figure 36F It is a schematic diagram showing the protruding portion and the recessed portion of the composite cylinder member of the fifth modification. Figure 36G It is a schematic diagram showing the protruding portion and the recessed portion of the composite cylinder member of the sixth modification. Figure 36H It is a schematic diagram showing the protruding portion and the recessed portion of the composite cylinder member of the seventh modification.

[0178] Figure 36A The fitting portion 35 shown in has the shape described in the fourth to sixth embodiments and the eighth example. Figure 36B In the first modification shown in FIG. 35, the mating portion 35 is Figure 36A Unlike the mating portion 35 shown, the protruding portion 13 is formed to have a substantially rectangular shape when viewed in the radial direction, and the two corners of the rectangular shape on the recessed portion 23 side are formed as contact portions 13a having arcuate surfaces. Similarly, in the first modification, when the first tubular component 10 thermally expands or contracts due to temperature changes, the abutment state between the contact portion 13a of the protruding portion 13 and the contact portion (i.e., the inclined surface) 23a of the recessed portion 23 is maintained, and the occurrence of shaking of the first tubular component 10 and the second tubular component 20 is reduced.

[0179] In Figure 36C In the second modification shown in FIG. 35, the mating portion 35 is Figure 36A Unlike the mating portion 35 shown, the protruding portion 13 has a substantially semicircular shape when viewed in the radial direction, and two portions of the semicircular shape are formed as contact portions 13a having arcuate surfaces. In addition, the recessed portion 23 is formed so that when viewed in the radial direction, the gap between the two inclined surfaces (i.e., the contact portions 23a) increases in accordance with the shape of the protruding portion 13. Similarly, in the second modification, when the first tubular component 10 thermally expands or contracts due to temperature changes, the abutment state between the contact portion 13a of the protruding portion 13 and the contact portion 23a of the recessed portion 23 is maintained. That is, the occurrence of shaking of the first tubular component 10 and the second tubular component 20 is reduced.

[0180] In Figure 36D In the third modification shown in FIG. 35, the mating portion 35 is Figure 36A ​​​​​​​Unlike the mating portion 35 shown, the protruding portion 13 has a generally rectangular shape when viewed in the radial direction, and the two corners of the rectangular shape on the recessed portion 23 side are formed as contact portions 13a having arcuate surfaces. In addition, the recessed portion 23 is formed to have a generally semicircular shape when viewed in the radial direction. Similarly, in the third modification, when the first tubular component 10 thermally expands or contracts due to temperature changes, the abutment state between the contact portion 13a of the protruding portion 13 and the contact portion 23a of the recessed portion 23 is maintained. That is, the occurrence of shaking of the first tubular component 10 and the second tubular component 20 is reduced.

[0181] In Figure 36E In the fourth modification shown in FIG. 35, the mating portion 35 is Figure 36A Unlike the mating portion 35 shown, the protruding portion 13 is formed to have a rectangular shape when viewed in the radial direction. In addition, the recessed portion 23 is formed to have a substantially semicircular shape when viewed in the radial direction. In the fourth modification, when the first tubular member 10 thermally expands or contracts due to temperature changes, the abutment state between the contact portion 13a of the protruding portion 13 and the contact portion 23a of the recessed portion 23 is not sufficiently maintained. That is, the effect of reducing the shaking of the first tubular member 10 and the second tubular member 20 is produced within a narrow temperature range.

[0182] In Figure 36F In the fifth modification shown in FIG. 35, the mating portion 35 is Figure 36A Unlike the mating portion 35 shown, the protruding portion 13 is formed to have a rectangular shape when viewed in the radial direction. In addition, the recessed portion 23 is formed to have a triangular shape when viewed in the radial direction and has two inclined surfaces (i.e., the contact portion 23a). In the fifth modification, when the first tubular component 10 thermally expands or contracts due to temperature changes, the abutment state between the contact portion 13a of the protruding portion 13 and the contact portion 23a of the recessed portion 23 is not fully maintained. That is, the effect of reducing the shaking of the first tubular component 10 and the second tubular component 20 is produced within a narrow temperature range.

[0183] In Figure 36G In the sixth modification shown in FIG. 35, the mating portion 35 is Figure 36A ​​​​​​Unlike the mating portion 35 shown, the protrusion 13 is formed to have a generally triangular shape when viewed in the radial direction, and has two inclined surfaces (i.e., the contact portion 13a). In addition, the recessed portion 23 is formed to have a curved shape when viewed in the radial direction, and has two arcuate surfaces (i.e., the contact portion 23a). In the sixth modification, although the influence of temperature changes has not been studied, it is believed that when the first tubular component 10 thermally expands or contracts due to temperature changes, the abutment state between the contact portion 13a of the protrusion 13 and the contact portion 23a of the recessed portion 23 will be generally maintained. In other words, it is believed that the occurrence of shaking of the first tubular component 10 and the second tubular component 20 will be reduced.

[0184] In Figure 36H In the mating portion 35 of the seventh modification shown in , Figure 36A Unlike the mating portion 35 shown, the protruding portion 13 is formed to have a substantially semicircular shape when viewed in the radial direction, and has two arc-shaped contact portions 13a. In addition, the recessed portion 23 is formed to have a contact portion 23a, which has two arc-shaped surfaces when viewed in the radial direction. In the seventh variant, although the influence of temperature changes has not been studied, it is believed that when the first tubular member 10 thermally expands or contracts due to temperature changes, the abutment state between the contact portion 13a of the protruding portion 13 and the contact portion 23a of the recessed portion 23 will be roughly maintained. In other words, it is believed that the occurrence of shaking of the first tubular member 10 and the second tubular member 20 will be reduced.

[0185] Feasibility of other embodiments

[0186] In the above-mentioned first to sixth embodiments and first to eighth examples, each of the tubular portion 11 of the first tubular member 10 and the tubular portion 21 of the second tubular member 20 is formed to be similar to a cylinder whose cross-section is circular orthogonal to the axial direction. However, the present disclosure is not limited thereto. For example, each of the tubular portion 11 of the first tubular member 10 and the tubular portion 21 of the second tubular member 20 may be formed to be similar to a cylinder whose cross-sectional shape is an ellipse or a polygon (e.g., a triangle, a rectangle, a pentagon, or a hexagon). In addition, the portion of the first tubular member 10 other than the tubular portion 11 and the portion of the second tubular member 20 other than the tubular portion 21 may have any shape.

[0187] ​In the above-described first to third embodiments and first to seventh examples, the protruding portion 12 is formed in the tubular portion 11 of the first tubular member 10. However, the present disclosure is not limited thereto. For example, protruding portions (each having a tab shape) may be formed in the tubular portion 21 of the second tubular member 20, or protruding portions (each having a tab shape) may be formed in both the tubular portion 11 of the first tubular member 10 and the tubular portion 21 of the second tubular member 20. In particular, in the case where the protruding portions are formed in both the tubular portion 11 of the first tubular member 10 and the tubular portion 21 of the second tubular member 20, the protruding portions may be formed alternately in the circumferential direction.

[0188] In the above-described fourth to sixth embodiments and eighth example, the protruding portion 13 is formed in the tubular portion 11 of the first tubular member 10, and the recessed portion 23 is formed in the tubular portion 21 of the second tubular member 20. However, the present disclosure is not limited thereto. For example, the protruding portion may be formed in the tubular portion 21 of the second tubular member 20, and the recessed portion may be formed in the tubular portion 21 of the second tubular member 20. That is, the protruding portion only needs to be formed in one of the tubular portions of the tubular portion 11 of the first tubular member 10 and the tubular portion 21 of the second tubular member 20, and the recessed portion only needs to be formed in the other tubular portion. In addition, although the case where the protruding portion 13 and the corresponding recessed portion 23 are in contact with each other at two positions (i.e., two contact portions) has been described, the present disclosure is not limited thereto. For example, the protruding portion 13 and the corresponding recessed portion 23 may be in contact with each other at three or more positions (i.e., three or more contact portions).

[0189] Other embodiments

[0190] Although the present disclosure has been described with reference to the exemplary embodiments, it should be understood that the present disclosure is not limited to the disclosed exemplary embodiments. The scope of the following claims should be interpreted in the broadest sense so as to cover all variations and equivalent structures and functions.

Claims

1. A component, comprising: a first tubular member including a tubular portion having a tubular shape; and a second tubular member including a tubular portion having a tubular shape and arranged coaxially with the first tubular member; wherein the first tubular member includes a plurality of protruding portions configured to protrude from one end of the tubular portion of the first tubular member in the axial direction and to be spaced apart from each other in the circumferential direction, wherein the first tubular member and the second tubular member are coupled to each other such that each of the plurality of protruding portions is coupled to the second tubular member, and Each of the plurality of protruding portions includes a distal end portion connected to the second tubular member and a base portion separated from the second tubular member.

2. The component according to claim 1, wherein The base portion is separated from the second tubular member in an axial direction.

3. A component according to claim 1 or 2, wherein: The base portion is separated from the second tubular member in a radial direction.

4. The component according to claim 1 or 2, wherein: The second tubular member is a continuous carbon fiber reinforced molded resin body.

5. The component according to claim 1 or 2, wherein: In a radial direction, a thickness of each of the plurality of protruding portions is smaller than a thickness of the tubular portion of the first tubular member.

6. The component according to claim 1 or 2, wherein: Each of the tubular portion of the first tubular member and the tubular portion of the second tubular member has a cylindrical shape.

7. The component according to claim 1 or 2, wherein: A linear expansion coefficient of the first tubular member and a linear expansion coefficient of the second tubular member are different from each other.

8. The component according to claim 1 or 2, wherein: A main component of the first tubular member and a main component of the second tubular member are the same resin material.

9. The component according to claim 8, wherein A main component of the first tubular member and a main component of the second tubular member are polycarbonate.

10. The component according to claim 8, wherein Each of the plurality of protruding portions is joined to the second tubular member by thermal welding.

11. A method for manufacturing a component, the method comprising: providing a first tubular member including a tubular portion having a tubular shape and a second tubular member, the first tubular member including a tubular portion having a tubular shape and being coaxially arranged with the first tubular member, the first tubular member including a plurality of protruding portions configured to protrude from one end of the tubular portion of the first tubular member in an axial direction and to be spaced apart from each other in a circumferential direction; as well as Each of the plurality of protrusions is coupled to the second tubular member such that a distal end portion of each of the plurality of protrusions is coupled to the second tubular member and a base portion of each of the plurality of protrusions is separated from the second tubular member.

12. A component, comprising: Base components; a first tubular member having a tubular shape, the first tubular member including a tubular portion including a first end surface, and the first tubular member being supported by the base member; and a second tubular member, the second tubular member having a tubular shape, the second tubular member including a tubular portion including a second end surface, and the second tubular member being supported by the base member, wherein the first tubular member is made of a material having a linear expansion coefficient higher than that of the second tubular member, wherein one of the tubular portion of the first tubular member or the tubular portion of the second tubular member comprises a protruding portion protruding from the first end surface or the second end surface, wherein the other of the tubular portion of the first tubular member or the tubular portion of the second tubular member includes a recessed portion which is recessed from the first end surface or the second end surface and which contacts the protruding portion at at least two locations, and The first tubular member and the second tubular member are connected to each other so that a first gap is formed between the first end surface and the second end surface to allow relative movement between the first end surface and the second end surface in a direction in which the first end surface and the second end surface face each other when the base member and the first tubular member relatively expand or contract with respect to the second tubular member due to temperature changes, and By expanding or contracting one of the protruding portion and the recessed portion relative to the other, the contact state between the protruding portion and the recessed portion is maintained even if the first end surface and the second end surface move relative to each other in the direction in which the first end surface and the second end surface face each other.

13. The member according to claim 12, wherein The first tubular member includes the protruding portion protruding from the first end surface, wherein the second tubular member includes the recessed portion recessed from the second end surface, wherein, when the temperature decreases, even if the first end surface moves closer to the second end surface in a direction in which the first end surface and the second end surface face each other, the protruding portion formed in the first tubular member contracts relatively with respect to the recessed portion formed in the second tubular member, thereby maintaining a contact state between the protruding portion and the recessed portion, and wherein, when the temperature rises, even if the first end surface moves away from the second end surface in a direction in which the first end surface and the second end surface face each other, the protruding portion formed in the first tubular member expands relative to the recessed portion formed in the second tubular member, thereby maintaining a contact state between the protruding portion and the recessed portion.

14. A component according to claim 12 or 13, wherein The second tubular member has a cylindrical shape, wherein the first tubular member has a cylindrical shape and is arranged coaxially with the second tubular member, and The direction in which the first end surface and the second end surface face each other is an axial direction.

15. A component according to claim 12 or 13, wherein: The second tubular member is a continuous carbon fiber reinforced molded resin body, and Wherein, the first tubular member is a molded resin product.

16. A component according to claim 12 or 13, wherein The recessed portion includes two inclined surfaces formed in a shape that becomes wider toward a direction in which the recessed portion opens in a direction in which the first end surface and the second end surface face each other, wherein the protruding portion has a shape that narrows toward a direction in which the protruding portion protrudes in a direction in which the first end surface and the second end surface face each other, and includes two arcuate surfaces that contact the corresponding two inclined surfaces, and Wherein, the protruding portion and the recessed portion contact each other at two locations through the two inclined surfaces and the two arc-shaped surfaces.

17. The component according to claim 16, further comprising: A connecting portion configured to connect the first tubular member and the second tubular member at a position where two imaginary planes intersect each other, one of the two imaginary planes including one of the two inclined surfaces, and the other of the two imaginary planes including the other of the two inclined surfaces.

18. A component according to claim 12 or 13, wherein: The first tubular member and the second tubular member are arranged in a state where a second gap is formed in a cylindrical shape in the circumferential direction. 19 . The member according to claim 18 , further comprising an elastic member disposed in the second gap and having a Shore A hardness of rubber hardness of 20 to 80 degrees.

20. A method of manufacturing a component, the method comprising: supply: Base components, a first tubular member having a tubular shape, the first tubular member including a tubular portion including a first end surface, and the first tubular member being supported by the base member, and a second tubular member, the second tubular member having a tubular shape, the second tubular member including a tubular portion including a second end surface, the second tubular member being made of a material having a linear expansion coefficient higher than a linear expansion coefficient of the first tubular member, and the second tubular member being supported by the base member, wherein one of the tubular portion of the first tubular member or the tubular portion of the second tubular member comprises a protruding portion protruding from the first end surface or the second end surface, wherein the other of the tubular portion of the first tubular member or the tubular portion of the second tubular member includes a recessed portion which is recessed from the first end surface or the second end surface and which contacts the protruding portion at at least two locations, and The first tubular member and the second tubular member are coupled such that: a first gap is formed between the first end surface and the second end surface to allow relative movement between the first end surface and the second end surface in a direction in which the first end surface and the second end surface face each other when the base member and the second tubular member relatively expand or contract with respect to the first tubular member due to temperature changes, and By expanding or contracting one of the protruding portion or the recessed portion relative to the other, the contact state between the protruding portion and the recessed portion is maintained even if the first end surface and the second end surface move relative to each other in a direction in which the first end surface and the second end surface face each other.

21. A device, comprising: A member according to any one of claims 1 to 10 or any one of claims 12 to 19; and At least one element is surrounded by at least one of the first tubular member or the second tubular member of the component.

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