JP5217638B2 - Sliding member and manufacturing method thereof, camera body, interchangeable lens for camera - Google Patents

Description

The present invention relates to a sliding member having a sliding contact portion that slides in contact with a contact surface of another member, a manufacturing method thereof , a camera body, and an interchangeable lens for a camera .

  2. Description of the Related Art Conventionally, there are many sliding members in which a coating film is formed on the surface of a sliding contact portion in such a sliding member that repeatedly slides in contact with a contact surface. Examples of such a member include a camera body lens mounting bracket called a bayonet and a camera mounting lens body mounting bracket. The bayonet has a base material made of brass, and a coating film made of metallic chromium is formed on the surface thereof.

  The reason why metal chrome is selected in the bayonet is that it is a metal with high reflectivity and beautiful luster, is relatively hard, is not a rare metal, and is inexpensive. For example, if a material that is hard but has low reflectivity is used instead of metallic chromium, desired appearance quality cannot be ensured. If a soft metal with a high reflectance is used, scratches are easily caused by exchanging the lens a few times, the appearance quality is liable to deteriorate, and the lens cannot be fixed due to wear.

  However, the hexavalent chromium electroplating method is used to form a coating film made of metallic chromium, but hexavalent chromium is also listed in the RoHS directive and is expected to be abolished from the viewpoint of preventing environmental pollution. It is rare.

Therefore, in Patent Document 1 below, hexavalent chromium is not used, and a nickel-based plating layer and a trivalent chromium layer are laminated in this order to achieve hardness and wear resistance comparable to the hexavalent chromium layer. doing.
JP 2006-225686A

  However, even conventional bayonets that use a hexavalent chromium layer may cause damage such as wear and scratches when the general user repeats lens replacement within a common number of times. There was a need for further improvement of sex.

Accordingly, the present invention is an object to provide a easy sliding member to improve the wear resistance of the sliding contact portion, and the other object is to provide a easy manufacturing method to manufacture such a sliding member It is still another object to provide a camera body provided with such a sliding member as a lens mounting bracket, and further provide an interchangeable lens for a camera provided with such a sliding member as a body mounting bracket. Let other issues .

A first aspect of the sliding member of the present invention that solves the above-described problem includes a sliding contact portion that slides in contact with another member, and a coating layer having a relatively high hardness on the surface of the sliding contact portion. and the sliding member and a low hardness coat layer coating film which are alternately stacked with a surface is formed, the coating _{film, Cr X N (4.5 ≧ X} ≧ 2.1) the coating layer, which value of X in each adjacent cover layer are stacked differently, the coating film has a film thickness of the coating layer using the respective coating layers alone to have a composition of Compared with the case where it forms in, it is characterized by a low wear rate.

Further, the second aspect of the sliding member of the present invention comprises a sliding contact portion that slides in contact with another member, and has a relatively hard coating layer and a hardness on the surface of the sliding contact portion. In the sliding member in which the coating film formed by alternately laminating the low coating layer with the interface is formed, the coating film has a composition of Cr _X N ( 4.5 ≧ X ≧ 2.1 ). the coating layer having registered, which value of X in each adjacent cover layer are stacked differently, the coating film was formed above the thickness of the coating film of each coating layer alone Compared to the case, the hardness is high.

Furthermore, the manufacturing method of the coating film according to the present invention includes the above-described sliding by laminating the coating layer by vapor deposition using chromium as a target in a supply atmosphere of nitrogen atoms or nitrogen ions. A method of manufacturing a member, wherein the ratio of chromium and nitrogen in each coating layer is adjusted by changing the supply atmosphere of nitrogen atoms or nitrogen ions for each coating layer using the target in common. It is characterized by.
A camera body according to the present invention includes the above-described sliding member.
Furthermore, an interchangeable lens for a camera according to the present invention includes the above-described sliding member.

According to the sliding member of the present invention, the surface of the sliding contact portion which slides in contact with the other member, alternating with relatively high hardness coat layer and the low coating hardness is a surface A laminated coating film is formed, and the coating film has a composition of Cr _X N (4.5 ≧ X ≧ 2.1), and the value of X of each adjacent coating layer is It is laminated differently, and the wear rate is low or the hardness is high compared to the case where each coating layer is formed to the thickness of the coating film alone. The wear resistance of the coating film can be improved.

Also, according to the manufacturing method of the sliding member of the present invention, since the plurality of coating layers constituting the coating film are formed and laminated by a predetermined vapor deposition method, each coating layer is compared with plating or the like. It is easy to form a thin film, and it is easy to change the ratio of chromium and nitrogen for each coating layer. As a result, the degree of freedom in selecting the laminated state of the coating layer can be increased, and the sliding member as described above can be easily manufactured.
Further, according to the camera body of the present invention, it is possible to provide a camera body provided with a sliding member having the above-described effects as a lens mounting bracket.
Furthermore, according to the interchangeable lens for a camera of the present invention, it is possible to provide an interchangeable lens for a camera provided with a sliding member that exhibits the above-described effects as a body mounting bracket.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

  First, in this invention, the slidable contact portion and the contacted portion are portions that come into contact with each other and slide, and the shape of the sliding surface is not limited at all. These sliding contact portions and contacted portions may be portions that abut against each other and temporarily slide, such as fitting portions, engaging portions, locking portions, screwing portions, and the like. Further, it may be a part that is continuously slid in a contacted state. Moreover, in this invention, a sliding member is a member provided with such a sliding contact part.

  In this embodiment, as a sliding member, a female bayonet 21 that is a lens mounting bracket of the camera body 11 and a body mounting bracket of the camera interchangeable lens 12 as shown in FIGS. This will be described using an example with a certain male bayonet 22.

  The camera body 11 and the camera interchangeable lens 12 of this embodiment are configured to be detachable, and a male bayonet 22 of the camera interchangeable lens 12 is provided with a claw portion 23 projecting from the female bayonet 21 of the camera body 11. An insertion portion 24 into which the claw portion 23 is inserted and a locking portion 25 to which the claw portion 23 is locked are provided. Although one or both of the claw part 23 and the locking part 25 are provided with a locking mechanism using an elastic member or the like, detailed illustration and description are omitted.

  In order to attach the camera interchangeable lens 12 to the camera body 11, the claw portion 23 of the male bayonet 22 is inserted into the insertion portion 24 of the female bayonet 21, and the contact surface 26 of the male bayonet 22 is received by the female bayonet 21. The camera interchangeable lens 12 is rotated with respect to the camera body 11. At this time, the contact surface 26 and the receiving surface 27 slide while being in contact with each other. Thereafter, the mounting is completed by further rotating and engaging the claw portion 23 of the male bayonet 22 with the engaging portion 25 of the female bayonet 21. At this time, the surface of the claw portion 23 and the surface of the locking portion 25 slide in contact with each other. Further, when the camera interchangeable lens 12 is detached from the camera body 11, these are performed in the reverse order. Therefore, the female bayonet 21 of the camera body 11 and the male bayonet 22 of the camera interchangeable lens 12 are slid in contact with each other each time the camera interchangeable lens 12 is replaced.

  In these female bayonet 21 and male bayonet 22, as shown in FIG. 3, a predetermined coating film 40 is formed on the surface of the base material 30 having the shape of each bayonet 21, 22.

  The base material 30 has a property necessary as a sliding member, such as metal, resin, ceramics, etc., and can be appropriately selected and used from a material that can form the coating film 40 with sufficient adhesion force. Usually, in the case of the female bayonet 21 and the male bayonet 22, the base material 30 is made of a metal such as brass.

  The coating film 40 is a film formed on the surface of the base material 30 with a sufficient adhesive force, and is a multilayer film in which a plurality of coating layers 41, 42. In this coating film 40, it is necessary that an interface is formed between adjacent coating layers 41, 42. The interface between the coating layers 41, 42... Is a boundary where the structure between the adjacent coating layers 41, 42. Therefore, although not clear, it can be estimated from the examples described later that it contributes to a decrease in the wear rate of the coating film 40 and an improvement in the hardness of the coating film 40.

Further, the coating layers 41, 42... Have a composition of Cr _X N ( 4.5 ≧ X ≧ 2.1), preferably Cr _X N (4.5 ≧ X ≧ 3.2 ). Yes. Therefore, it is easy to adjust to a desired hardness by adjusting the ratio of chromium and nitrogen. Further, since the metal nitride (chromium nitride) constituting the coating layers 41, 42,... Can take an intermediate structure between a complete metal crystal and a complete nitrogen compound crystal, the metal layer can be maintained while maintaining a desired hardness. It can maintain its properties and appearance and can be easily replaced with conventional chrome plating. The chromium / nitrogen ratio is based on the atomic ratio.

Of the coating layers 41 and 42 ..., each coating layer adjacent to a nitride of the same metal chromium, ing from the ratio of chromium and nitrogen are different layers. If a nitride of the same metal, it is easy to secure the bonding strength between the adjacent coating layers 41, 42,.

  Moreover, it is also preferable that the coating layers 41, 42,... That are not adjacent to each other among the plurality of coating layers 41, 42,. It is because it is easy to suppress the kind of material used with respect to the number of laminations. Moreover, if it is not an adjacent layer, an interface can be formed between each layer.

  Although the thickness of each coating layer 41, 42 ... is not specifically limited, the wear resistance and hardness of the coating film 40 are improved by reducing the thickness of each coating layer 41, 42 .... If it can be easily performed, the thickness of each of the coating layers 41, 42... Is preferably thin as long as a clear interface can be formed, for example, 500 nm or less.

  The number of the coating layers 41, 42... Is at least 3 or more, and can be formed in a large amount within a range in which sufficient film strength of the coating film 40 can be secured during sliding. If the number of layers is increased, more interfaces can be formed.

  In such a coating film 40, as one aspect for improving the wear resistance, a plurality of coating layers 41, 42,... The wear rate of the coating film 40 is made smaller than the wear rate when each is formed to the thickness of the coating film 40 alone. The wear rate is a value measured under common conditions by an appropriate method such as a ball-on-disk method.

  Here, even if any of the coating layers 41, 42,... Constituting the coating film 40 is formed as a single layer with the film thickness of the coating film 40, the value is set to a value that cannot be reached. The reason why this occurs is not clear, but the following estimation is also possible. That is, when an ultrathin film is laminated with an interface, when a shearing force is applied in the film thickness direction, the film gradually wears into a thin layer along the interface. When the film is worn or peeled into a thin layer, it is not deeply swept in the film thickness direction at once. As a result, when compared with the same film thickness, it can be estimated that the wear rate of the multilayer film laminated with an interface is slower than that of the single layer film.

  Further, as another aspect for improving the wear resistance of the coating film 40, a plurality of coating layers 41, 42,... The hardness of the coating film 40 is made higher than the hardness in the case where each of the. The hardness is a value measured under common conditions by a method suitable for measuring the hardness of a thin film, such as a nanoindentation method.

  Here, even if any of the coating layers 41, 42,... Constituting the coating film 40 is formed as a single layer with a film thickness of the coating film 40, the coating film is made to have a high hardness that cannot be reached. 40 wear resistance is improved.

  In the two modes for improving the wear resistance of the coating film 40, for example, the coating layers 41, 42,... Are stacked by adjusting the material, the nitrogen concentration, the film thickness, the number of stacked layers, and the like. Thus, the wear rate and hardness of the coating film 40 are realized in such a specific range.

  Moreover, the two aspects for improving the wear resistance of these coating films 40 may be provided with at least one, but preferably both are provided.

  Furthermore, two modes for improving the wear resistance of these coating films 40 are as follows: coating layers 41, 42,... Made of materials having different hardnesses are alternately formed between layers having high hardness and layers having low hardness. Although it is not clear by laminating so as to be disposed in, for example, the coating layers 41, 42...

  According to the female bayonet 21 and the male bayonet 22 provided with the coating film 40 as described above, one or both surfaces of the abutment surface 26 and the receiving surface 27 that abut against each other and slide, the claw portion 23 and the engagement surface. A coating film 40 in which a plurality of coating layers 41, 42... Are laminated with an interface is formed on one surface or both surfaces of the stop portion 25, preferably on the entire surface. 42..., 42... Alone are formed in the thickness of the coating film 40, so that the wear rate of the coating film 40 is low or the hardness of the coating film 40 is high. ... Abrasion rate and hardness that cannot be obtained alone can be realized. As a result, it is possible to achieve wear resistance that cannot be obtained by each of the coating layers 41, 42... Alone, and improve the wear resistance of the coating film 40.

  Next, a method for manufacturing such a female bayonet 21 and a male bayonet 22 will be described. Here, the female bayonet 21 and the male bayonet 22 are manufactured by providing the coating film 40 on the surface of the base material 30 formed in the shape of each bayonet 21 and 22 in advance.

  In order to produce the coating film 40 on the surface of the base material 30, various film forming methods can be used as long as the method can satisfy at least the conditions for improving the wear resistance of the coating film 40. Can be produced.

  Preferably, vapor deposition methods such as vacuum deposition, ion plating, arc ion plating, filtered arc ion plating, filtered cathodic vacuum arc, sputtering, plasma CVD, molecular beam epitaxy, and these gas phases It is preferable to deposit and coat each of the coating layers 41, 42... By a film forming method having a plurality of characteristics of the film forming method. If the layers are deposited by the vapor deposition method, it is easy to form the coating layers 41, 42,... Much thinner than the plating by adjusting the deposition conditions. It is preferable that the degree of freedom can be increased.

  In particular, when a plurality of layers or all of the coating layers 41, 42... Are made of the same metal nitride and have a different ratio of metal to nitrogen, the same metal target is used in common. By changing the supply atmosphere of nitrogen atoms or nitrogen ions for each of the layers 41, 42,..., The ratio of the metal and nitrogen of each coating layer 41, 42,. It is preferred to perform the membrane.

  Here, the supply atmosphere of nitrogen atoms or nitrogen ions is, for example, in the case of a vapor deposition method that generates plasma, by supplying a nitrogen gas or in a vapor deposition method that does not generate plasma. In some cases, it can be formed by supplying ammonia or the like into the film formation chamber. In such a supply atmosphere of nitrogen atoms or nitrogen ions, the metal particles ejected from the target are nitrided during flight and can be deposited on the surface of the substrate 30 as metal nitride.

  In such a supply atmosphere of nitrogen atoms or nitrogen ions, if the supply amount of the nitrogen component is adjusted, the ratio of metal to nitrogen of the metal nitride deposited on the substrate 30 can be easily adjusted. It is easy to vary the ratio of metal to nitrogen for each coating layer 41, 42.

Moreover, since the metal target is common, each coating layer 41 ... by sequentially laminating Repeat adjusting the supply amount of the nitrogen component, it is possible to easily produce a coating film 40.

Examples will be described below.
[Film formation by the filtered cathodic vacuum arc (hereinafter referred to as FCVA) method]

  Here, an apparatus comprising a film forming chamber and an FCVA source was used as the film forming apparatus, and a Cr target was attached to the cathode in the FCVA source. A vacuum arc discharge was generated in the FCVA source to convert the Cr target into a plasma, and a high-purity Cr ion stream was introduced into the deposition chamber by an electromagnetic filter. At the same time, the Cr / N atomic ratio was adjusted by adjusting the flow rate of nitrogen gas introduced into the film forming chamber. After a predetermined time, the plasma was stopped, the residual gas was evacuated, the inside of the film formation chamber was vented to return to atmospheric pressure, and the sample was taken out from the film formation chamber to prepare a sample covered with a chromium nitride film.

  Prepare a brass plate as a sample, wash it sequentially in an organic solvent, alkali, and pure water, and then change the nitrogen flow rate during film formation by the above film formation method to obtain four types of single-layer chromium nitride films ( AD) It produced. Each chromium nitride film had a thickness of 2 μm. The chemical composition, hardness, and wear rate of the obtained chromium nitride film were measured.

  The chemical composition was measured by the Rutherford backscattering (RBS) method, the hardness was measured by the nanoindentation method, and the wear rate was measured by the ball-on-disk method. The results are shown in Table 1.

As apparent from the results in Table 1, as the Cr / N ratio decreases, that is, as the nitriding rate increases, the hardness increases and the wear rate decreases. That is, it was confirmed that if nitriding is promoted, the wear resistance is improved.
[Example 1]

  In the same manner as the FCVA method described above, coating layers made of chromium nitride films having the same chemical composition as the above-described chromium nitride films A and B are alternately laminated on the surface of the brass flat plate by 10 nm, respectively. A coating film made of a chromium nitride multilayer film was prepared so as to have a thickness of 2 μm.

The hardness, wear rate, and average chemical composition in the film thickness direction of the obtained coating film were measured. The results are shown in Table 1.
[Comparative Example 1]

A chromium plating film having a thickness of 2 μm was formed on the surface of a brass flat plate by a conventional hexavalent chromium plating method. The hardness and wear rate of the obtained chromium plating film were measured, and the results are shown in Table 1.

  As is clear from the results in Table 1, the hardness of Example 1 is that the chromium nitride film is formed by laminating a coating layer made of a chromium nitride film having a chemical composition equivalent to that of the chromium nitride films A and B. The hardness is slightly higher than the hardness of each of the single-layer film of A and the single-layer film of chromium nitride film B. Further, the wear rate of Example 1 is much lower than the wear rates of the single layer film of the chromium nitride film A and the single layer film of the chromium nitride film B, and the hardness is the highest and the hardness is the highest. Compared with a single layer film of a high chromium nitride film D, the value is ½.

  Therefore, it was found that by laminating a plurality of coating layers, a hard coating film can be obtained with a remarkably low wear rate.

  The chromium plating film of Comparative Example 1 had the lowest hardness in Table 1 and the highest wear rate. When Example 1 and Comparative Example 1 are compared, Example 1 is 1/8 times the wear rate of Comparative Example 1, and by stacking a plurality of coating layers, it is compared with a conventional chromium plating film. It was found that the durability against wear can be remarkably improved.

Thus, in Example 1, although it is not clear as a reason which was able to reduce a wear rate significantly, the following estimation is also possible. That is, when an ultrathin film is laminated with an interface, when a shearing force is applied in the film thickness direction, the film gradually wears into a thin layer along the interface. When the film is worn or peeled into a thin layer, it is not deeply swept in the film thickness direction at once. As a result, when compared with the same film thickness, it can be estimated that the wear rate of the multilayer film laminated with an interface is slower than that of the single layer film. In particular, when the coating layers having different hardnesses are alternately laminated as in Example 1, it can be estimated that such an effect can be obtained more strongly.
[Example 2]

  A coating film made of a chromium nitride multilayer film was formed on the female bayonet base material and male bayonet base material made of brass having a predetermined shape in the same manner as in Example 1, and the female bayonet and male bayonet were formed. The produced and obtained bayonet and male bayonet were attached to a camera body and an interchangeable lens for a camera, respectively.

［比較例２］ The camera interchangeable lens was repeatedly attached to and detached from the camera body 1000 times, and the degree of scratching and film peeling was visually observed. The results are shown in Table 2.

[Comparative Example 2]

A chrome-plated film was formed on the brass female bayonet base material and male bayonet base material having the same shape as in Example 2 in the same manner as in Comparative Example 1 to produce female bayonet and male bayonet. In the same manner as described above, the camera interchangeable lens was continuously attached to and detached from the camera body 1000 times, and the degree of scratching and the degree of film peeling were visually observed. The results are shown in Table 3.

As is apparent from Tables 2 and 3, as a result of the attachment / detachment test, the durability of the bayonet can be drastically improved when a coating film made of a chromium nitride multilayer film is used as compared with a conventional chromium plating film. It could be confirmed.
[Example 3]

  The base material which consists of a flat plate of brass was prepared similarly to Example 1, and ultrasonic cleaning was performed in order in the organic solvent, the alkali, and the pure water. A magnetron sputtering apparatus was used, a Cr target was attached to the cathode, a substrate after ultrasonic cleaning was attached to a holder, and the magnetron sputtering apparatus was installed in a film forming chamber of the magnetron sputtering apparatus. The film formation chamber was evacuated to a pressure on the order of 1 × 10 −4 Pa. Ar gas was introduced into the deposition chamber, a voltage was applied to the holder using a pulsed DC power source to generate Ar plasma, and the surface of the substrate was cleaned by Ar plasma ion bombardment. The plasma was stopped after a predetermined time, and the Ar gas remaining in the film formation chamber was exhausted.

  Next, a chromium nitride film was formed. Here, Ar gas and nitrogen gas were introduced into the film forming chamber, a voltage was applied to the Cr target using a pulsed DC power source to generate plasma, and sputtering of the Cr target was started. The Cr particles ejected from the target were nitrided while flying in the plasma and deposited on the surface of the base material, and a chromium nitride film was formed on the surface of the bayonet base material.

  At that time, by adjusting the flow rate of nitrogen gas introduced into the film forming chamber, chromium nitride films having different Cr / N ratios were alternately stacked as in the first embodiment. After a predetermined time, the plasma was stopped, the residual gas was evacuated, the inside of the film formation chamber was vented to return to atmospheric pressure, and the sample was taken out from the film formation chamber to prepare a sample covered with a chromium nitride film.

  When the hardness and wear rate of the obtained film were measured, it was found that the hardness increased and the wear rate decreased compared to the case where each of the alternately laminated chromium nitride films was formed alone. confirmed.

From the above experimental results, even when the chromium nitride film is formed by the sputtering method, the hardness and the wear rate are obtained by alternately laminating films having different Cr / N ratios as in the case of forming the film by the FCVA method. It was confirmed that the effect of the present invention that both of the above are improved can be obtained.
The following supplementary notes 1 to 4 do not necessarily correspond to the embodiments of the invention described in the claims.
(Appendix 1)
Each of the coating layers 41, 42,... Constituting the coating film 40 can be formed with sufficient adhesive force on the surface of the adjacent substrate 30 or the coating layers 41, 42,. In this case, a material made of a material capable of forming an interface with the adjacent coating layers 41, 42.
(Appendix 2)
It is preferable that a part or all of the plurality of coating layers 41, 42,... Are made of metal because it is easy to obtain gloss and adjustment of desired hardness is easy.
(Appendix 3)
Further, it is also preferable that the coating layers 41, 42... Are made of a metal nitride such as Cr, Fe, Ni, Al, Mg. This is because the desired hardness can be easily adjusted by adjusting the ratio of metal to nitrogen. More specifically, in the case of Cr, Ni, and Al, the metal / nitrogen ratio is larger than 1, in the case of Fe, the metal / nitrogen ratio is larger than 4, and in the case of Mg, the metal / nitrogen ratio is increased. The ratio is preferably greater than 1.5. In this range, the metal nitride constituting the coating layers 41, 42,... Can take an intermediate structure between a complete metal crystal and a complete nitrogen compound crystal, so that the properties of the metal can be maintained while maintaining a desired hardness. This is because the appearance can be maintained and it can be easily replaced with conventional chrome plating or the like. The above metal / nitrogen ratio depends on the atomic ratio.
(Appendix 4)
In particular, it is preferable that a plurality of layers of the covering layers 41, 42..., More preferably, all the layers are made of a nitride of the same metal and have a different ratio of metal to nitrogen. . This is because it is easy to ensure the bonding strength between the adjacent coating layers 41, 42.

It is a schematic side view of the camera provided with the bayonet of embodiment of this invention. It is a front view of the bayonet of the embodiment, (a) shows the female bayonet of the camera body, (b) shows the male bayonet of the interchangeable lens for cameras. It is an expanded partial sectional view of the surface of the bayonet of the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Camera body 12 Interchangeable lens for cameras 21 Female bayonet 22 Male bayonet 30 Base material 40 Coating film 41, 42 ... Coating layer

Claims (8)

Includes a sliding contact portion for sliding contact with the other member, the surface of the sliding contact portion, and a relatively high hardness coating layer and the lower coating layer hardness are alternately stacked with a surface In the sliding member on which the coating film is formed,
The coating film is for the covering layer to have a composition of _{Cr X N (4.5 ≧ X ≧} 2.1) were stacked so that the value of X in each adjacent cover layer is different,
The sliding film is characterized in that the wear rate is lower than that in the case where each of the coating layers is formed alone with the thickness of the coating film. Includes a sliding contact portion for sliding contact with the other member, the surface of the sliding contact portion, and a relatively high hardness coating layer and the lower coating layer hardness are alternately stacked with a surface In the sliding member on which the coating film is formed,
The coating film is for the covering layer to have a composition of _{Cr X N (4.5 ≧ X ≧} 2.1) were stacked so that the value of X in each adjacent cover layer is different,
The sliding film is characterized in that the coating film has a higher hardness than the case where each of the coating layers is formed alone with the thickness of the coating film. The coating film is formed by laminating the coating layers having a composition of Cr _X N (4.5 ≧ X ≧ 3.2) so that X values of adjacent coating layers are different. The sliding member according to claim 1 or 2, characterized by the above. The sliding member according to any one of claims 1 to 3, characterized in that a lens mounting bracket of the camera body. The sliding member according to any one of claims 1 to 3 , wherein the sliding member is a body mounting bracket of an interchangeable lens for a camera . The sliding member according to any one of claims 1 to 5, wherein the coating layer is stacked by forming a film by a vapor deposition method using chromium as a target in a supply atmosphere of nitrogen atoms or nitrogen ions. A method of manufacturing,
A sliding member characterized in that the ratio of chromium and nitrogen in each coating layer is adjusted by changing the supply atmosphere of nitrogen atoms or nitrogen ions for each coating layer using the target in common. Manufacturing method . A camera body comprising the sliding member according to claim 4 . An interchangeable lens for a camera, comprising the sliding member according to claim 5 .

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