TWI438557B - Gasket - Google Patents

Description

Gasket

The present invention relates to a gasket, and more particularly to a gasket for a camera shutter brake system.

The camera shutter is a time control mechanism that allows the photosensitive element to obtain a suitable amount of exposure. In the early days of camera development, due to the low sensitivity of the photosensitive material and the long exposure time required, the lens cover was mounted and removed to control the exposure time. In recent years, as the sensitivity and shooting requirements of photosensitive materials have increased, the requirements for camera shutter speed have also increased.

In order to increase the shutter speed, not only the quality of the shutter blade is lowered, but also the braking performance of the camera shutter brake mechanism is improved to reduce the influence of the shutter blade on the shutter blade itself.

Please refer to FIG. 1 and FIG. 2 . FIG. 1 is a schematic structural diagram of a camera shutter 100 . The camera shutter 100 includes a shutter substrate 10, a driving device 20, a braking device 30, and a shutter blade structure (not shown).

The shutter substrate 10 is used to support the shutter blade structure, the driving device 20, and the braking device 30. The shutter substrate 10 includes a body 12 having a shutter opening 14 disposed at a central location of the body 12 and extending through the body 12. When the camera shutter 100 is turned on, external light can be radiated from the shutter opening 14 to a photosensitive member. When the camera shutter 100 is closed, the shutter blade structure blocks the shutter opening 14 to block the external light from being incident on the photosensitive element.

The driving device 20 is configured to connect the shutter blade structure and drive the shutter blade structure to perform a longitudinal opening and closing action to open or close the shutter opening 14. The driving device 20 includes two rotating shafts 26, a front blade driving lever 22 and a rear blade driving lever 24, and the front blade driving lever 22 and the rear blade driving lever 24 respectively pass the two rotating shafts 26 and the shutter substrate 10 is coupled and rotatable about the axis of rotation 26. The front blade drive lever 22 and the rear blade drive lever 24 are disposed on the same side of the shutter substrate 10. The front blade drive lever 22 and the rear blade drive lever 24 are respectively rotatable clockwise or counterclockwise about the rotating shaft 26, and drive the shutter blade to perform a longitudinal opening and closing action to shield or open the shutter. Opening 14 is used to effect exposure of the photosensitive element.

The braking device 30 is used to effect braking of the shutter blade structure. The brake device 30 is disposed at an end point of the path in which the front blade drive lever 22 and the rear blade drive lever 24 rotate clockwise about the rotation shaft 26. The brake device 30 includes a support shaft 34, two washers 38, a brake lever 32, and a disc spring 36. The support shaft 34 is for supporting the spacer 38, the brake lever 32, and the disc spring 36. The spacer 38, the brake lever 32, the spacer 38, and the disc spring 36 are sleeved on the support shaft 34 in order from top to bottom. The two washers 38 grip the brake lever 32, which are pressed against the brake lever 32 by a disc spring 36.

When the front blade drive lever 22 and the rear blade drive lever 24 are rotated clockwise about the rotation shaft 26 to reach the end point of the path, the front blade drive lever 22 and the rear blade drive lever 24 can be braked by the brake device 30. Specifically, when the front blade drive lever 22 rotates clockwise around the rotating shaft 26 to reach the end of the path, the front blade drive lever 22 abuts The brake lever 32 is rotated and the brake lever 32 is rotated about a support shaft 34. When the brake lever 32 is rotated, the washer 38 and the brake lever 32 are under the pressure of the disc spring 36. Friction is generated between the frictional force of the front blade drive lever 22, thereby further braking the front blade drive lever 22 and the shutter blade structure. The braking principle of the trailing blade drive lever 24 is the same as that of the front blade drive lever 22.

The gasket 38 of the prior art is typically prepared using a polyethylene terephthalate (PET) material. However, as the shutter speed continues to increase, the shutter blade structure produces greater wear during the braking process using the gasket 38 made of polyethylene terephthalate (PET) material, making the brake It is difficult for the device 30 to maintain the initial braking effect, which in turn tends to damage the shutter blade structure.

In view of this, it is necessary to provide a gasket having a high-intensity and wear-resistant camera shutter brake system.

The present invention provides a gasket for providing a stable frictional force to a brake lever in a camera shutter brake system to brake the brake lever, wherein the spacer includes at least two stacked nanometers a carbon tube composite structure, wherein each of the carbon nanotube composite structures is composed of a carbon nanotube structure and a polymer, and the carbon nanotube structure is composed of a plurality of carbon nanotubes, the nanocarbon The carbon nanotubes in the tube structure are preferentially oriented in the same direction, and the extending direction of the carbon nanotubes in each nanocarbon tube composite structure and the extending direction of the carbon nanotubes in the adjacent carbon nanotube composite structure are formed. A crossing angle α, 0° < α ≦ 90 °.

Compared with the prior art, the gasket in the camera shutter of the present invention is composed of a plurality of carbon nanotubes and a polymer, since the carbon nanotube itself has strong mechanical strength. The tensile strength is 100 times that of the steel, and the elastic modulus is equivalent to the elastic modulus of the diamond. Therefore, the gasket has high strength and durability, and can be conveniently applied to a camera shutter brake system to enhance the camera. Shutter speed and durability. In addition, since the extending direction of the carbon nanotubes in each of the carbon nanotube composite structures in the gasket forms an intersection angle α, 0° with the extending direction of the carbon nanotubes in the adjacent carbon nanotube composite structure. <α≦90° allows the gasket to have a certain strength in all directions.

100‧‧‧ camera shutter

10‧‧‧Shutter substrate

12‧‧‧Ontology

14‧‧‧Shutter opening

20‧‧‧ drive

22‧‧‧Front blade drive rod

24‧‧‧ rear blade drive rod

26‧‧‧Rotary axis

30‧‧‧ brakes

32‧‧‧Brake lever

34‧‧‧Support shaft

36‧‧‧ disc spring

38;40;50;60‧‧‧shims

42; 622‧‧‧Nano carbon tube film

44;54;624‧‧‧ polymer

52‧‧‧Nano carbon pipeline

62‧‧‧Nano Carbon Tube Composite Structure

1 is a schematic structural view of a prior art camera shutter.

2 is a schematic structural view of a brake device in a camera shutter of the prior art.

3 is a cross-sectional structural view of a gasket according to a first embodiment of the present invention.

4 is a SEM photograph of a carbon nanotube film taken by a gasket according to a first embodiment of the present invention.

Fig. 5 is a SEM photograph of a carbon nanotube rolled film used in the gasket according to the first embodiment of the present invention.

Fig. 6 is a SEM photograph of a carbon nanotube flocculation film used in the gasket according to the first embodiment of the present invention.

FIG. 7 is a cross-sectional structural view of a gasket according to a second embodiment of the present invention.

Figure 8 is a SEM photograph of a twisted nanocarbon line used in a gasket according to a second embodiment of the present invention.

Figure 9 is a SEM photograph of a non-twisted nanocarbon line used in a gasket according to a second embodiment of the present invention.

FIG. 10 is a cross-sectional structural view of a gasket according to a third embodiment of the present invention.

The gasket provided by the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

The present invention provides a shim for providing a stable frictional force to a brake lever in a camera shutter brake system to brake the brake lever. The gasket is composed of a carbon nanotube structure and a polymer composite. The carbon nanotube structure is a self-supporting structure composed of a plurality of carbon nanotubes. The carbon nanotube structure comprises a plurality of carbon nanotubes, and the adjacent carbon nanotubes are closely connected by van der Waals and form a plurality of gaps. The carbon nanotube structure is compounded inside the polymer. That is, the polymer is coated on the surface of the carbon nanotube structure and filled in a gap between the carbon nanotubes.

The gasket is an annular sheet having a certain mechanical strength and friction resistance, and the gasket has a thickness of 50 micrometers to 500 micrometers, preferably 50 micrometers to 100 micrometers. The inner and outer diameters of the gasket can be prepared according to actual needs.

In the gasket, the mass percentage of the carbon nanotubes is 5% to 80%, and preferably, the mass percentage of the carbon nanotubes is 10% to 30%. It can be understood that when the content of the carbon nanotubes is low, synergy between the polymer and the carbon nanotubes can be exerted to improve the performance of the gasket.

It will be appreciated that the thickness of the gasket can be determined by the carbon nanotube structure and the thickness of the polymer. The polymer is a thermosetting material or a thermoplastic material such as an epoxy resin, a polyolefin, an acrylic resin, a polyamide, a polyurethane (PU), a polycarbonate (PC), a polyacetal resin (POM), a polyparaphenylene Ethylene formate (PET), polymethyl Methyl methacrylate (PMMA), anthracene resin, and the like.

Referring to FIG. 3, a first embodiment of the present invention provides a gasket 40 which is composed of a carbon nanotube structure and a polymer composite. The carbon nanotube structure is composed of a plurality of stacked carbon nanotube membranes 42 having a plurality of gaps between adjacent carbon nanotubes 42 in the carbon nanotube membrane 42. The polymer 44 is a polyethylene terephthalate material, and the polyethylene terephthalate is coated on the surface of the carbon nanotube structure and filled in the gap between the carbon nanotubes. . The spacer 40 has a thickness of about 50 microns. The carbon nanotubes account for about 20% of the mass percentage of the entire gasket 40.

Referring to FIG. 4, the carbon nanotube film is a self-supporting structure composed of a plurality of carbon nanotubes. The plurality of carbon nanotubes are arranged in a preferred orientation along the length direction of the carbon nanotube film. The preferred orientation means that the overall extension direction of most of the carbon nanotubes in the carbon nanotube film is substantially in the same direction. Moreover, the overall extension direction of the majority of the carbon nanotubes is substantially parallel to the surface of the carbon nanotube film. Further, most of the carbon nanotubes in the carbon nanotube film are connected end to end by van der Waals force. Specifically, each of the carbon nanotubes of the majority of the carbon nanotubes extending in the same direction in the carbon nanotube film is connected end to end with the carbon nanotubes adjacent in the extending direction by van der Waals force . Of course, there are a few carbon nanotubes in the carbon nanotube film that deviate from the extending direction. These carbon nanotubes do not constitute an obvious alignment of the majority of the carbon nanotubes in the carbon nanotube film. influences. The self-supporting carbon nanotube film does not require a large-area carrier support, and as long as the support force is provided on both sides, it can be suspended in the whole to maintain its own film state, that is, the carbon nanotube film is placed (or When fixed on two supports arranged at a certain distance, the carbon nanotube film located between the two supports can be suspended to maintain its own film state. The self-supporting is mainly through the continuous arrangement of nanometers extending through the end of the van der Waals force through the nano carbon tube film. Realized with carbon tubes. Specifically, the plurality of carbon nanotubes extending substantially in the same direction in the carbon nanotube film are not absolutely linear and may be appropriately bent; or are not completely aligned in the extending direction, and may be appropriately deviated from the extending direction. . Therefore, it is not possible to exclude partial contact between the carbon nanotubes juxtaposed in the majority of the carbon nanotubes extending substantially in the same direction of the carbon nanotube film. Specifically, the carbon nanotube film comprises a plurality of continuous and aligned carbon nanotube segments. The plurality of carbon nanotube segments are connected end to end by van der Waals force. Each carbon nanotube segment consists of a plurality of mutually parallel carbon nanotubes. The carbon nanotube segments have any length, thickness, uniformity, and shape.

In the structure of the gasket 40, the carbon nanotube film 42 is stacked on each other in the carbon nanotube structure, and the adjacent carbon nanotube film 42 is tightly connected by van Gogh. Connected. The majority of the carbon nanotubes in the carbon nanotube film 42 extend in the same direction in the same direction, and each of the carbon nanotubes in the majority of the carbon nanotubes is adjacent to the nanometer in the extending direction. The carbon tubes are connected end to end by van der Waals. Each of the carbon nanotubes in the majority of the carbon nanotubes is closely connected to the adjacent carbon tubes by van der Waals and forms a plurality of gaps. When the spacer 40 is composed of a plurality of stacked layers of the carbon nanotube film 42 , preferably, at least two layers of the carbon nanotube film 42 have an axial extension direction of the carbon nanotubes forming an intersection angle α, 0° < α ≦ 90 °. More preferably, most of the carbon nanotubes in each of the carbon nanotube membranes 42 have an axial extension direction and most of the nanoparticles in the adjacent carbon nanotube membrane 42 The axial extension direction of the carbon tube forms an intersection angle α, 0° < α ≦ 90°. In this embodiment, the crossing angle α is 90°. The polyethylene terephthalate material is coated on the surface of the carbon nanotube structure and filled in a gap between the carbon nanotubes.

It can be understood that the spacer 40 is applied to the braking device in the camera shutter 100. At 30 o'clock, the shim 40 replaces the conventional shim 38 which provides a stable frictional force to the brake lever 32 to brake the brake lever 32. The gasket 40 is prepared by combining a plurality of carbon nanotubes and a polymer. Since the carbon nanotube itself has strong mechanical properties, the tensile strength is 100 times that of the steel, and the elastic modulus is The modulus of elasticity of the diamond is equivalent, and therefore, the gasket 40 can be made to have high wear resistance and durability. In addition, due to the axial extension direction of most of the carbon nanotubes in each of the carbon nanotube drawn films 42 of the gasket 40 and the majority of the carbon nanotubes in the adjacent carbon nanotube film 42 The axial extension direction forms a 90° crossing angle, and therefore, the gasket 40 can be prevented from being cracked in the extending direction of the carbon nanotube, and the gasket 40 can have a certain strength in any direction.

The preparation method of the gasket 40 includes: providing a plurality of carbon nanotube film, laminating the plurality of carbon nanotube films, forming a carbon nanotube structure, and forming the carbon nanotube structure The axial direction of the carbon nanotubes in each of the carbon nanotubes is formed at an angle of 90° with the axial direction of the carbon nanotubes in the adjacent carbon nanotube film; The carbon nanotube structure is immersed in a solution or a melt of polyethylene terephthalate, or a solution or melt of a polyethylene terephthalate is sprayed or applied to the carbon nanotube The structure is such that the carbon nanotube structure is combined with the polyethylene terephthalate to obtain a carbon nanotube composite structure; finally, the obtained carbon nanotube composite structure is subjected to press working to form the gasket. 40.

It can be understood that the carbon nanotube structure is not limited to being composed of a carbon nanotube film, and may be composed of a carbon nanotube film, a carbon nanotube film or at least two of the three carbon nanotube films. A layered structure.

The carbon nanotube rolled film is a self-supporting carbon nanotube film obtained by rolling a carbon nanotube array. The carbon nanotube rolled film includes uniformly distributed nano Carbon tubes and carbon nanotubes are arranged in the same direction or in different directions. Most of the carbon nanotubes in the carbon nanotube rolled film are substantially parallel to the surface of the carbon nanotube rolled film. The carbon nanotubes in the carbon nanotube film are partially overlapped with each other and are attracted to each other by van der Waals force, so that the carbon nanotube film has good flexibility and can be bent and folded into Any shape without breaking. Moreover, since the carbon nanotubes in the carbon nanotube rolled film are attracted to each other by the van der Waals force, the carbon nanotube film is a self-supporting structure. The carbon nanotubes in the carbon nanotube rolled film form an angle β with the surface of the growth substrate forming the carbon nanotube array, wherein β is greater than or equal to 0 degrees and less than or equal to 15 degrees, and the angle β is applied The pressure on the carbon nanotube array is related. The larger the pressure, the smaller the angle. Preferably, the carbon nanotubes in the carbon nanotube rolled film are aligned parallel to the growth substrate. The carbon nanotube rolled film is obtained by rolling a carbon nanotube array, and the carbon nanotubes in the carbon nanotube rolled film have different arrangement forms according to different rolling methods. Specifically, the carbon nanotubes may be disorderly arranged; when rolled in different directions, the carbon nanotubes are arranged in different orientations; see FIG. 5, when rolling in the same direction, the carbon nanotubes are along a The orientation is preferred and the orientation is preferred. The length of the carbon nanotubes in the carbon nanotube rolled film is greater than 50 microns. The area of the carbon nanotube rolled film is substantially the same as the size of the carbon nanotube array. The thickness of the carbon nanotube film is related to the height of the carbon nanotube array and the pressure of the rolling, and may be between 0.5 nm and 100 μm. It can be understood that the larger the height of the carbon nanotube array and the smaller the applied pressure, the larger the thickness of the prepared carbon nanotube rolled film; on the contrary, the smaller the height of the carbon nanotube array, the more the applied pressure Large, the smaller the thickness of the prepared carbon nanotube rolled film.

It can be understood that when the carbon nanotube structure in the gasket 40 is composed of a plurality of laminated carbon nanotube laminated membranes, the adjacent carbon nanotube membranes are closely connected by van der Waals force. . Most of the carbon nanotubes in the carbon nanotube rolled film overlap each other. Place Each of the carbon nanotubes in the carbon nanotube structure is closely connected to the adjacent carbon nanotubes by van der Waals and forms a plurality of gaps. The arrangement direction of the carbon nanotubes in the carbon nanotube structure depends on the arrangement direction of the carbon nanotubes in the carbon nanotube film. Preferably, most of the carbon nanotubes in the carbon nanotube rolled film extend substantially in the same direction and are parallel to the surface of the carbon nanotube film, and the carbon nanotube structure is The axial extension direction of most of the carbon nanotubes in each nano carbon nanotube rolled film forms an intersection angle α with the axial extension direction of most of the carbon nanotubes in the adjacent carbon nanotube rolled film. 0° < α ≦ 90 °. The polymer is coated on the surface of the carbon nanotube structure and filled in a gap between the carbon nanotubes.

Referring to FIG. 6, the carbon nanotube flocculation membrane is a self-supporting carbon nanotube membrane obtained by flocculation treatment of a carbon nanotube raw material, such as a super-aligned array. The carbon nanotube flocculation membrane comprises carbon nanotubes which are intertwined and uniformly distributed. The carbon nanotubes have a length greater than 10 microns, preferably from 200 microns to 900 microns, such that the carbon nanotubes are intertwined with each other. The carbon nanotubes are attracted to each other by van der Waals forces to form a network structure. Since the large number of carbon nanotubes in the self-supporting carbon nanotube flocculation membrane are attracted to each other and entangled by van der Waals force, the carbon nanotube flocculation membrane has a specific shape to form a self-supporting structure. . The carbon nanotube flocculation membrane is isotropic. The carbon nanotubes in the carbon nanotube flocculation membrane are uniformly distributed and randomly arranged, and the area and thickness of the carbon nanotube flocculation membrane are not limited, and the thickness is approximately 0.5 nm to 100 μm. between.

It can be understood that when the thickness of the carbon nanotube flocculation membrane is large, the carbon nanotube structure in the gasket 40 can be composed of a single-layer carbon nanotube flocculation membrane in which the carbon nanotube structure is Adjacent carbon nanotubes are attracted to each other by van der Waals forces to form a plurality of microporous structures. The polymer is coated on the carbon nanotube structure and filled in the nanocarbon Microporous structure between tubes. When the thickness of the carbon nanotube film is small, the carbon nanotube structure in the gasket 40 is composed of a plurality of laminated carbon nanotube flocculation membranes, and adjacent nano carbon The tube flocculation membranes are closely connected by van der Waals forces. The plurality of carbon nanotubes in the gasket are intertwined to prevent cracking of the gasket 40 in a certain direction, and the gasket 40 has a certain strength in any direction.

Referring to Figure 7, a second embodiment of the present invention provides a shim 50 for a camera shutter braking system. The gasket 50 is formed by combining a carbon nanotube structure with a polymer 54. The carbon nanotube structure is composed of a plurality of stacked carbon nanotube layers, and the carbon nanotube layer comprises a plurality of nano carbon pipelines 52 arranged in parallel and side by side, the nanocarbon pipeline 52 comprising A plurality of carbon nanotubes. The carbon nanotube structure is compounded inside the polymer 54. There may be a certain gap between the carbon nanotubes in the carbon nanotube structure or between the nanocarbon pipelines 52, and the polymer 54 material may be coated on the surface of the carbon nanotube structure and filled. a gap in the carbon nanotube structure. The polymer 54 is an epoxy resin material. The spacer 50 has a thickness of 50 micrometers, and the spacer 50 is an annular sheet-like structure. The carbon nanotubes account for about 25% by mass of the entire gasket 50.

In the structure of the gasket 50, the nano carbon line 52 in each of the carbon nanotube layers is in close contact with the adjacent nano carbon line 52 by van der Waals, adjacent nano carbon The pipe layers are tightly connected by van der Waals. Preferably, the nanocarbon lines 52 in at least two layers of carbon nanotubes are arranged to form an intersection angle α, 0° < α ≦ 90°. More preferably, the nanocarbon lines 52 in any two adjacent carbon nanotube layers are arranged to form an intersection angle α, 0° < α ≦ 90°. In this embodiment, the crossing angle α is 90°. It can be understood that in the structure of the gasket 50, each of the plurality of carbon nanotubes 52 in the plurality of nanocarbon pipelines 52 and the adjacent nanocarbon pipelines 52 may also be spaced apart. Due to the gasket The carbon nanotubes 52 in the adjacent two carbon nanotube layers in 50 are disposed to cross each other, thereby preventing the gasket 50 from being cracked in all directions and making the gasket 50 parallel to its surface. It has a certain strength in any direction.

Referring to FIG. 8, the nanocarbon line 52 can employ a twisted nanocarbon line. Most of the carbon nanotubes in the twisted nanocarbon pipeline extend substantially in the same axial direction, and each of the carbon nanotubes in the majority of the carbon nanotubes is adjacent to the axial extension direction The carbon nanotubes are connected end to end by van der Waals, and each of the carbon nanotubes in the majority of the carbon nanotubes is closely connected to the adjacent carbon nanotubes by van der Waals force. The twisted nanocarbon line is obtained by twisting both ends of the carbon nanotube film in opposite directions by a mechanical force. The length of the twisted nanocarbon line is not limited.

The preparation method of the gasket 50 includes: providing a plurality of twisted nano carbon pipelines; arranging the plurality of twisted nanocarbon pipelines side by side in the same direction to form a carbon nanotube layer, and then twisting the plurality of carbon nanotube layers The carbon nanotubes are stacked on the surface of the carbon nanotube layer in another direction, and thus repeatedly forming a carbon nanotube structure; immersing the carbon nanotube structure in a solution or melt of an epoxy resin material Or spraying or coating a solution or melt of an epoxy resin material on the carbon nanotube structure, and combining the carbon nanotube structure with the epoxy resin material to obtain a carbon nanotube composite structure. Finally, the obtained carbon nanotube composite structure is subjected to press working to form the gasket 50.

It can be understood that the carbon nanotube line 52 in the carbon nanotube structure is not limited to a twisted nanocarbon line, and may also be selected from a non-twisted nano carbon line.

Referring to FIG. 9, the non-twisted nano carbon pipeline is obtained by treating a carbon nanotube film by an organic solvent. Specifically, the organic solvent is impregnated onto the entire surface of the carbon nanotube film, and under the action of surface tension generated when the volatile organic solvent is volatilized, The plurality of mutually parallel carbon nanotubes in the carbon nanotube film are tightly bonded by van der Waals force, thereby shrinking the carbon nanotube film into a non-twisted nano carbon line. The organic solvent is a volatile organic solvent such as ethanol, methanol, acetone, dichloroethane or chloroform. The non-twisted nanocarbon pipeline includes a plurality of carbon nanotubes extending along the length of the nanocarbon pipeline and connected end to end. Specifically, the non-twisted nanocarbon pipeline includes a plurality of carbon nanotube segments, and the plurality of carbon nanotube segments are connected end to end by van der Waals force, and each of the carbon nanotube segments includes a plurality of parallel and pass through each other Derived tightly combined with carbon nanotubes. The carbon nanotube segments have any length, thickness, uniformity, and shape. The length of the non-twisted nanocarbon line is not limited.

It can be understood that in the structure of the gasket 50, the nano carbon pipeline of each twisted nano pipeline in the plurality of twisted nanocarbon pipelines may be spaced apart from the adjacent twisted carbon carbon pipeline.

Referring to Figure 10, a third embodiment of the present invention provides a shim 60 for a camera shutter braking system. The gasket 60 includes at least two stacked carbon nanotube composite structures 62, wherein the respective carbon nanotube composite structures 62 are composited by a carbon nanotube structure and a polymer 624. The carbon nanotube structure may include the carbon nanotube film in the first embodiment of the present invention, and may also include the nano carbon pipeline in the second embodiment of the present invention, and may also use a carbon nanotube film or a naphthalene film. Rice carbon pipeline. In the gasket 60, the carbon nanotube structure is compounded inside the polymer 624. There may be a certain gap between the carbon nanotubes in the carbon nanotube structure or between the carbon nanotubes, and the polymer 624 may be coated on the surface of the carbon nanotube structure and filled in the chamber. The gap in the carbon nanotube structure is described. The polymer may be selected from the polymers of the first embodiment of the invention.

In this embodiment, the spacer 60 includes two layers of sheet-like carbon nanotube composites arranged in a stack. Structure 62, wherein the carbon nanotube composite structure 62 is a composite of a carbon nanotube structure and a polymer 624. The carbon nanotube structure includes a plurality of carbon nanotube film 622 stacked substantially in the same direction. The carbon nanotube film 622 is the same as the carbon nanotube film 42 of the first embodiment of the present invention. That is, the axial directions of most of the carbon nanotubes in each of the carbon nanotube composite structures 62 extend substantially in the same direction. The axial extension of most of the carbon nanotubes in each of the carbon nanotube composite structures 62 forms an angle of intersection with the axial extension of most of the carbon nanotubes in the adjacent carbon nanotube composite structure 62. α, 0° < α ≦ 90 °. In this embodiment, the crossing angle is 90°. The carbon nanotube structure is formed with a plurality of gaps. The polymer 624 is a polyethylene terephthalate material, and the polyethylene terephthalate is coated on the surface of the carbon nanotube structure and filled in the gap between the carbon nanotubes. . The spacer 60 has a thickness of 50 microns. The carbon nanotubes accounted for 30% by mass of the entire gasket 60. When the spacer 60 is applied to the braking device 30 in the camera shutter 100, since most of the carbon nanotubes in each of the carbon nanotube composite structures 62 in the spacer 60 extend in the direction and adjacent The extension direction of most of the carbon nanotubes in the carbon nanotube composite structure 62 forms a 90° crossing angle, thereby preventing the gasket 60 from being cracked in the extending direction of the carbon nanotubes. The spacer 60 has a certain strength in any direction.

It can be understood that when the carbon nanotube structure includes the nano carbon pipeline in the second embodiment of the present invention, the nano carbon pipelines are parallel to each other and arranged side by side in the carbon nanotube structure, and adjacent The carbon nanotubes are closely connected by van der Waals. The extending direction of the nanocarbon pipeline in each nanocarbon tube composite structure forms an intersection angle α with the extending direction of the nanocarbon pipeline in the adjacent carbon nanotube composite layer structure, 0°<α≦90 °. Preferably, the angle of intersection is 90°.

The preparation method of the gasket 60 includes: providing at least two layers of carbon nanotube composite structures, which are laminated by laminating a plurality of carbon nanotubes in the same direction to form a nanometer. a carbon tube structure, immersing the carbon nanotube structure in a solution or a melt of polyethylene terephthalate, or spraying or smearing a solution or melt of polyethylene terephthalate The carbon nanotube structure is prepared by combining a carbon nanotube structure and the polyethylene terephthalate; and the at least two layers of carbon nanotube composite structures are stacked and each The axial extension direction of most of the carbon nanotubes in the carbon nanotube composite structure forms a 90° crossing angle with the axial extension direction of the carbon nanotubes in the adjacent carbon nanotube composite structure, and is subjected to heat. The laminate is formed by press working; finally, the laminate is subjected to press working to form the spacer 60.

The gasket in the camera shutter brake system provided by the embodiment of the invention has the following advantages: First, the gasket provided by the invention is composed of a plurality of carbon nanotubes and a polymer, since the carbon nanotube itself has a very Strong mechanical properties, its tensile strength is 100 times that of steel, and its modulus of elasticity is equivalent to that of diamond. Therefore, the gasket has high strength and durability, and can be easily applied to camera shutter brakes. System to increase camera shutter speed and durability. Secondly, the plurality of carbon nanotubes in the gasket cross each other at a certain angle, and the gasket is prevented from being cracked in the extending direction of the carbon nanotubes, and the gasket has any direction A certain strength. Finally, since the gasket is composed of a carbon nanotube and a polymer in a certain ratio, when the content of the carbon nanotube is low, the synergy between the polymer and the carbon nanotube can be exerted. Role to maximize the performance of the gasket.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above is only a preferred embodiment of the present invention, and cannot be limited by this. The scope of the patent application in this case. Equivalent modifications or variations made by those skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

60‧‧‧shims

62‧‧‧Nano Carbon Tube Composite Structure

622‧‧‧Nano carbon tube film

624‧‧‧ polymer

Claims (14)

A gasket for providing a stable frictional force to a brake lever in a camera shutter brake system to brake the brake lever, the improvement being that the spacer includes at least two stacked arrangements a carbon nanotube composite structure, wherein each of the carbon nanotube composite structures is composed of a carbon nanotube structure and a polymer, and the carbon nanotube structure is composed of a plurality of carbon nanotubes, the nai The carbon nanotubes in the carbon nanotube structure extend preferentially in the same direction, and the extension direction of the carbon nanotubes in each nanocarbon tube composite structure and the extension of the carbon nanotubes in the adjacent carbon nanotube composite structure The direction forms a crossing angle α, 0° < α ≦ 90°, and the mass percentage of the carbon nanotubes in the gasket is 10% to 30%. The gasket of claim 1, wherein the carbon nanotube structure is a self-supporting structure composed of a plurality of carbon nanotubes. The gasket of claim 1, wherein the carbon nanotube structure is composited inside the polymer. The gasket of claim 1, wherein the polymer is coated on the surface of the carbon nanotube structure and filled in a gap between the carbon nanotubes. The gasket of claim 1, wherein each of the carbon nanotube structures comprises at least one carbon nanotube membrane, the carbon nanotube membrane comprising a plurality of carbon nanotubes, the plurality of carbon nanotubes Most of the carbon nanotubes in the process extend substantially in the same direction. The gasket according to claim 5, wherein, when each of the carbon nanotube structures comprises two or more carbon nanotube membranes, the two or more carbon nanotube membranes are stacked and adjacent to each other. The membranes are closely connected by van der Waals. The gasket of claim 5 or 6, wherein the carbon nanotube membrane comprises a plurality of carbon nanotubes, and most of the plurality of carbon nanotubes are in a direction of extension The adjacent carbon nanotubes are connected end to end by van der Waals force. The gasket of claim 1, wherein each of the carbon nanotube structures comprises a plurality of nanocarbon lines, the plurality of carbon carbon lines being disposed in the same direction. The gasket of claim 8, wherein each of the nanocarbon lines comprises a plurality of carbon nanotubes, the plurality of carbon nanotubes extending substantially in the same direction. The gasket according to claim 9, wherein each of the plurality of carbon nanotubes and the carbon nanotubes adjacent to the extending direction are connected end to end by a van der Waals force. The gasket of claim 9, wherein each of the plurality of carbon nanotubes is closely connected to the adjacent carbon nanotubes by van der Waals force. The gasket of claim 8 wherein the adjacent nanocarbon lines are closely connected by van der Waals forces. The gasket of claim 8, wherein the extending direction of the nanocarbon pipeline in each of the carbon nanotube composite structures and the extending direction of the nanocarbon pipeline in the adjacent carbon nanotube composite structure A crossing angle α is formed, 0° < α ≦ 90°. The gasket of claim 1, wherein the gasket has a thickness of from 50 micrometers to 500 micrometers.