WO2014136861A1

WO2014136861A1 - Composite member provided with decorative film having metallic shine

Info

Publication number: WO2014136861A1
Application number: PCT/JP2014/055723
Authority: WO
Inventors: 瀧　優介
Original assignee: 株式会社ニコン
Priority date: 2013-03-06
Filing date: 2014-03-06
Publication date: 2014-09-12
Also published as: JP2016101658A

Abstract

This composite member (100) comprises a substrate (60), and a decorative film (80) that covers said substrate, wherein said decorative film (80) is a metal-doped amorphous carbon, and has a thickness of 10 nm or greater. The present invention provides: a composite member that has excellent wear resistance and that has formed thereon a decorative film having a metallic shine and a metallic texture; and an optical component and an electronic component provided with said composite member.

Description

Composite member provided with decorative film having metallic luster

The present invention relates to a composite member in which a decorative film having a metallic luster is formed as an uppermost layer, and an optical component and an electronic component including the composite member.

Metals such as aluminum alloys and resins are used as base materials for composite members that make up the body of digital cameras and mobile phones. Design elements such as the shape and appearance of such composite members are important factors that greatly influence the commercial value of digital cameras, mobile phones, and the like. In this respect, the appearance of the base material formed from the resin is poor in quality, and may be insufficient in terms of adding commercial value. Therefore, conventionally, a composite member in which a metal film is formed as a decorative film on a lightweight and inexpensive resin base material molded by a method such as injection molding has been used. As a result, the composite member could be given a metallic luster, and an attempt was made to ensure high-quality design.

Furthermore, in order to prevent the decorative film made of a metal film from being damaged or peeled off, a composite member in which a translucent film is formed on the metal film has been proposed as shown in FIG. 4 of Patent Document 1, for example. Yes.

JP 2009-172904 A

The present invention has been made in view of such circumstances, and an object thereof is to provide a composite member having a metallic luster and a metallic material feeling and having high wear resistance. Furthermore, an object of this invention is to provide an optical component and an electronic component provided with such a composite member.

According to a first aspect, a composite member comprising:
A substrate;
A decorative film as the uppermost layer covering the substrate;
A composite member in which the decorative film is amorphous carbon doped with metal and has a thickness of 10 nm or more is provided.

In the composite member, the decorative film may have a thickness of 300 nm or less.

In the composite member, the decorative film may have an electrical resistivity in a range of 1 × 10 ⁻⁵ Ωcm to 8 × 10 ⁻³ Ωcm.

In the composite member, the decorative film may have a hardness of 10 GPa to 20 GPa.

In the composite member, an underlayer may be provided between the base material and the decorative film. The foundation layer may include a resin layer. The underlayer may be a transparent layer and / or a colored layer.

In the composite member, a colored layer may be provided between the base material and the decorative film, and a transparent layer may be further provided between the colored layer and the base material.

In the composite member, the decorative film may be provided directly on the base material. Furthermore, the base material may be a colored base material.

In the composite member, the decorative layer may have a thickness of 10 to 20 nm.

In the composite member, the base material may be plastic.

In the composite member, the metal may be titanium or aluminum.

In the composite member, the base material may be a camera housing part.

According to the second aspect, an optical apparatus provided with the composite member of the first aspect is provided.

According to the third aspect, an electronic apparatus including the composite member of the first aspect is provided.

According to the above aspect, it is possible to provide a composite member on which a decorative film having high wear resistance and a metallic luster and a metallic material feeling is formed, and an optical component and an electronic component including the composite member.

It is a schematic sectional drawing of the surface of the composite member of 1st Embodiment. It is a schematic sectional drawing of the surface of the composite member of 2nd Embodiment provided with a transparent layer between a base material and a decoration film. It is a schematic sectional drawing of the surface of the composite member of 3rd Embodiment provided with a colored layer between a base material and a decoration film. It is a schematic sectional drawing of the surface of the composite member of 4th Embodiment provided with a transparent layer and a colored layer between a base material and a decoration film. It is a schematic block diagram which shows the structure of a FCVA film-forming apparatus. 10 is a table showing film forming conditions and evaluation results of samples manufactured in Examples 1 to 9 and Comparative Examples 1 and 2. 10 is a table showing film forming conditions and evaluation results of samples manufactured in Examples 10 to 13 and Comparative Examples 3 to 6.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

<First Embodiment>
As shown in FIG. 1, the composite member 100 of 1st Embodiment has the base material 60 and the decoration film | membrane 80 as an uppermost layer which coat | covers a base material. The “uppermost layer” means a layer that appears on the outermost surface of the composite member, and no other layer exists on the layer. The “decorative film” is a film formed to enhance the design of the product on all or part of the part appearing on the appearance of the product, and does not appear on the product appearance due to connection with other members. The decorative film does not include a film formed on the part, for example, a film that is formed on a part that is in sliding contact with another member and is not exposed to the outside in a use state.

Various materials are used for the base material 60 of the composite member 100 depending on applications. When the composite member 100 of the present embodiment is used in a camera system, the base member 60 is formed of, for example, a metal such as aluminum or stainless steel, an inorganic material such as ceramic, an organic material such as resin, or the like, and has an arbitrary shape. It is possible to use a camera housing component having the same. Since the resin is inexpensive and has a small specific gravity, it is possible to reduce the weight of the composite member and to mass-produce it at low cost by using the base material 60 formed by injection molding of the resin. As the resin, a resin (plastic) suitable for mass production processes such as injection molding is preferable. For example, polycarbonate, polyethylene, polyvinyl chloride, polystyrene, ABS resin, polypropylene, polyvinyl acetate, acrylic resin (PMMA), polyethylene terephthalate (PET), fluororesin such as polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK), polyamideimide (PAI), polyphenylene sulfide (PPS), polyester resin, and glass fiber and carbon in these resins Various thermoplastic resins such as a resin to which fibers are added can be used. Moreover, the base material 60 may be colored by, for example, kneading a pigment or a dye into the base material.

The decorative film 80 is made of amorphous carbon doped with metal. The amorphous carbon, sp ³ bonded carbon ^sp 3 -C, carbon composition carbon ^sp 2 -C of sp ² bonded corresponding to graphite is a mixture randomly corresponding to the diamond (hereinafter, as "a-C ”). Amorphous carbon is a material that has the characteristics of both diamond and graphite, and has high hardness and excellent wear resistance.

It has been considered that it is difficult to obtain a desired metallic appearance (metallic luster) and material feeling even if wear resistance can be obtained by amorphous carbon. This is because the high hardness of amorphous carbon is realized by covalent bonds between carbon atoms without free electrons, while metallic luster and metallic texture are realized by having many free electrons. It is. In the present embodiment, by using amorphous carbon doped with metal (hereinafter referred to as “aC: M” as appropriate), good wear resistance, metallic appearance (metallic luster), and texture are obtained. Succeeded in producing the decorative film provided.

As the metal doped into amorphous carbon, Ti, Ni, Cr, Al, Mg can be used from the viewpoint of wear resistance of the decorative film 80, metallic appearance (metallic luster) and material feeling, particularly metallic appearance. Cu, Fe, Ag, Au, Pt and the like. Of these, Ti, Al, Cr, Ni, and Fe are preferable, and Ti and Al are particularly preferable. The metal content (dope amount) in the decorative film 80 is 1 to 33 at%, particularly 1 to 20 at%, in order to maintain the wear resistance and the metallic appearance and texture of the decorative film 80 appropriately. desirable. When the content is less than 1 at%, the metallic appearance (metallic luster) and the material feeling are insufficient. If the content exceeds 20 at%, the hardness of the decorative film 80 decreases and the wear resistance tends to deteriorate.

The amorphous carbon layer doped with metal of the decorative film 80 has a thickness of 10 nm or more. If the thickness of the decorative film 80 is less than 10 nm, it is difficult to recognize the metallic luster of the decorative film 80. Furthermore, the amorphous carbon layer doped with metal of the decorative film 80 preferably has a film thickness of 300 nm or less. When the film thickness of the decorative film 80 exceeds 300 nm, a lot of film formation time and material for the decorative film 80 are required, and the productivity of the manufacturing process of the composite member 100 is reduced. In this respect, the upper limit of the thickness of the decorative film 80 is particularly preferably 100 nm. Furthermore, if the thickness of the decorative film 80 is 20 nm or less, the light transmittance of the decorative film 80 increases, and the hue of the substrate 60 can be seen through the decorative film 80. Therefore, when the base material 60 colored in a desired color or a colored layer on the base material 60 is provided, the composite member 100 having a desired color metallic luster can be obtained, so that the film of the decorative film 80 is used. More preferably, the thickness is 10 nm to 20 nm.

The amorphous carbon layer doped with metal of the decorative film 80 preferably has an electrical resistivity in the range of 1 × 10 ⁻⁵ Ωcm to 8 × 10 ⁻³ Ωcm. Low electrical resistivity is a property unique to metal binding materials having free electrons. A metallic texture due to metallic luster and high heat transfer is also a property that can be obtained by the presence of free electrons. Therefore, when the electrical resistivity of the decorative film 80 is equal to or lower than the above upper limit, the decorative film 80 has free electrons. Therefore, the composite member 100 including the decorative film 80 may have a desired metallic luster and metallic feel. it can. On the other hand, when the electrical resistivity of the decorative film 80 is less than the lower limit, the film is extremely soft like a noble metal, and the wear resistance of the composite member 100 including the decorative film 80 becomes insufficient. Is appropriate.

The amorphous carbon doped with metal of the decorative film 80 preferably has a hardness of 10 GPa to 20 GPa. When the hardness of the decorative film 80 is less than the lower limit, the wear resistance of the composite member 100 including the decorative film 80 becomes insufficient, and the composite member 100 may be damaged or the decorative film 80 may be peeled off. . On the other hand, when the hardness of the decorative film 80 exceeds the above upper limit, it becomes a transparent film having almost no free electrons and does not exhibit a metallic luster.

Second Embodiment
The composite member 200 of this embodiment includes a base layer between the base material 60 and the decorative film 80 as shown in FIG. The foundation layer in the second embodiment is the transparent layer 120. The transparent layer 120 can be formed by spray coating a resin called a clear coat. By forming the base layer (transparent layer 120), when the surface of the substrate 60 has irregularities or defects, the irregularities and defects of the substrate 60 can be filled. Therefore, the composite member 200 including the transparent layer 120 between the base material 60 and the decorative film 80 can have high quality appearance quality with small roughness and few defects.

<Third Embodiment>
As shown in FIG. 3, the composite member 300 of this embodiment includes an underlayer between the base material 60 and the decorative film 80. The ground layer in the third embodiment is a colored layer 140. In order to make the hue of the colored layer 140 visible through the decorative film 80, the thickness of the decorative film 80 is preferably 10 to 20 nm. The colored layer 80 can be formed by spray-coating a clear coat resin containing a pigment or dye that absorbs light in a specific wavelength band.

<Fourth embodiment>
The composite member 400 of this embodiment includes a base layer between the base material 60 and the decorative film 80 as shown in FIG. The foundation layer in the fourth embodiment includes a colored layer 140 and a transparent layer 120 between the colored layer 140 and the substrate 60. In order to make the hue of the colored layer 140 visible through the decorative film 80, the thickness of the decorative film 80 is preferably 10 to 20 nm. The transparent layer 120 can be formed by spray coating a resin called a clear coat. By forming the transparent layer 120, when the surface of the substrate 60 has irregularities or defects, the irregularities and defects of the substrate 60 can be filled. Therefore, the composite member 400 including the transparent layer 120 between the base material 60 and the decorative film 80 can have high quality appearance quality with small roughness and few defects.

<Method for producing decorative film>
As an example of a film forming method for forming a decorative film on a substrate, an outline of a FCVA (Filtered Cathodic Vacuum Arc) method and a film forming apparatus 1 for performing the method will be described with reference to FIG.

The FCVA film forming apparatus 1 mainly includes an arc plasma generating unit 10, a filter unit 20, and a film forming chamber unit 30. The arc plasma generation unit 10 and the film forming chamber unit 30 are connected by the filter unit 20, and the pressure of the film forming chamber unit 30 is set to a vacuum degree of about 10 ⁻⁵ [Torr] by a vacuum device (not shown).

The arc plasma generator 10 is provided with a target 11 which is a cathode and an anode (striker), and an arc discharge is generated by bringing the striker into contact with the target 11 and separating immediately after the striker. When forming an aC film, graphite is used as the target 11 and arc plasma (carbon plasma) is generated by arc discharge. The neutral carbon particles and carbon ions generated by the arc plasma fly through the filter unit 20 toward the film forming chamber unit 30. In order to manufacture the decorative film made of the metal-doped aC film of the above embodiment, a graphite target containing a metal and not containing hydrogen is used. Examples of the metal species include Ti, Ni, Cr, Al, Mg, Cu, Fe, Ag, Au, and Pt as described above.

The filter unit 20 is provided with a duct 23 around which an electromagnetic coil 21 is wound and an ion scanning coil 25. The duct 23 is bent twice in two orthogonal directions between the arc plasma generating unit 10 and the film forming chamber unit 30, and an electromagnet coil 21 is wound around the outer periphery thereof. Since the duct 23 has such a bent structure (double bend structure), neutral particles in the duct 23 are removed by colliding with the inner wall surface and being deposited. On the other hand, when a current is passed through the electromagnetic coil 21, Lorentz force acts on the charged particles inside the duct 23, and is concentrated in the central region of the duct cross section, flies along the duct bend, and enters the film forming chamber 30. Can lead. That is, the electromagnetic coil 21 and the duct 23 constitute a narrow-band electromagnetic spatial filter that allows only charged particles to pass with high efficiency.

The ion scanning coil 25 scans the beam of charged particles that passes through the duct 23 and enters the film forming chamber 30 as described above, and is uniformly aC: on the surface of the substrate 32 held by the holder 31. An M film is formed. The base material may be an arbitrary material made of an organic material such as a resin or an inorganic material such as a metal or ceramic. When the decorative film is used for a composite member for a camera, a plastic such as a resin, or a metal such as aluminum or stainless steel is used.

The film forming chamber section 30 is provided with a plate-shaped holder 31 facing the outlet of the filter section 20, and a base material 32 is set on the surface of the holder 31. The holder 31 can be rotated around its rotation axis by a motor 35. An arbitrary bias can be set to the holder 31 by a power source 37.

<Parts with composite members>
According to a further embodiment, a component having a composite member as described above is also provided. The composite member of the above embodiment can be used for parts of various applications from the viewpoint of the high wear resistance, the metallic appearance (metallic luster) and the metallic material feeling of the composite member. Suitable for parts such as digital cameras, optical devices such as binoculars, glasses, etc., electronic devices such as mobile phones, smartphones, portable music devices, portable video devices, etc. .

[Example]
Although the manufacturing method of the member provided with a decoration film is described below, the present invention is not limited to those examples.

Examples 1-7
Using an FCVA film forming apparatus 1 as shown in FIG. 5, an aC: Ti film (titanium-doped amorphous carbon film) was produced as an amorphous carbon layer on the substrate by the FCVA method. As the target 11 containing a metal element, a sintered graphite target containing 2.15 [at%] of Ti was used. The sintered graphite target used was dehydrated. A polycarbonate substrate was used as the base material. aC: As the operating condition of the FCVA film forming apparatus 1 when forming the Ti film, the current of the arc power source (cathode side power source) in the arc plasma generation unit 10 is 60 A, and the current of the electromagnetic coil 21 in the filter unit 20 (filter Current) was 13 A, the anode-side power source current (anode current) in the arc plasma generator 10 was 8 A, and the voltage (duct voltage) of the ion scanning coil 25 was 0.2 V. The bias power supply voltage was floating. The aC: Ti film was adjusted to various film thicknesses as shown in the table of FIG. 6 by controlling the film formation time.

Examples 8 and 9
Using the FCVA film forming apparatus 1 used in Examples 1 to 7, an aC: Al film (aluminum-doped amorphous carbon film) was formed as an amorphous carbon layer on the substrate by the FCVA method. As the target 11 containing a metal element, a sintered graphite target containing 8.5 [at%] of Al was used. The sintered graphite target used was dehydrated. A polycarbonate substrate was used as the base material. aC: As the operating condition of the FCVA film forming apparatus 1 when forming the Al film, the arc current of the arc power source (cathode side power source) in the arc plasma generation unit 10 is 70 A, and the current of the electromagnetic coil 21 in the filter unit 20 ( The filter current was 13 A, the anode-side power source current (anode current) in the arc plasma generator 10 was 8 A, and the voltage (duct voltage) of the ion scanning coil 25 was 0.2 V. The bias power supply voltage was floating. The film thickness of the aC: Al film was adjusted to 15 nm and 300 nm, respectively, by controlling the film formation time.

Comparative Example 1
A Ti film was produced on the substrate by the FCVA method using the FCVA film forming apparatus 1 used in the examples. A Ti target was used as the target 11. A polycarbonate substrate was used as the substrate. As operating conditions of the FCVA film forming apparatus 1 when forming the Ti film, the arc current of the arc power source (cathode side power source) in the arc plasma generation unit 10 is 140 A, and the current (filter current) of the electromagnet coil 21 in the filter unit 20 is The current (anode current) of the anode side power source in the arc plasma generator 10 was 10.5 A, and the voltage (duct voltage) of the ion scanning coil 25 was 0.5 V. The bias power supply voltage was floating. The thickness of the Ti film was set to 200 nm by controlling the film formation time.

Comparative Example 2
An aC: Ti film was prepared in the same manner as in Example 1 except that the film thickness of the aC: Ti film was changed to 5 nm.

For the samples of Examples 1 to 9 and Comparative Examples 1 and 2 produced as described above, the reflectance and transmittance at a wavelength of 500 nm were measured with a visible spectrophotometer. Further, the chromaticity of the sample was measured with a color computer SM-4 type manufactured by Suga Test Instruments Co., Ltd. The results are shown in the table of FIG. The samples of Examples 1 to 9 had a reflectance of 29.7 to 34.1%. The sample of Comparative Example 1 had a reflectance of 53.2%. The sample of Comparative Example 2 had a reflectance of 10.7%. Further, the transmittance of the samples of Examples 4 to 7 and Example 9 in which the film thickness of the aC: M film is 25 nm or more is 0%, and the hue of the polycarbonate substrate that has passed through the aC: M film is I couldn't see it. On the other hand, in the samples of Examples 1 to 3 and Example 8 in which the film thickness of the aC: M film is 20 nm or less, the transmittance is 12.6% to 56.3%, and the aC: M film And the hue of the polycarbonate substrate was seen. When the chromaticity of the sample displayed by the L * a * b * color system is a * ≈0 and b * ≈0, “no hue” is displayed.

Next, the presence or absence of metallic luster was measured for the samples of Examples 1 to 9 and Comparative Examples 1 and 2. The metallic luster was measured with a digital variable gloss meter (Digital Variable Gloss Meter, UGV-5D, manufactured by Suga Test Instruments Co., Ltd.). The measurement conditions are as follows.
Light source: D65
Angle: 60 degrees Reference material: 60 ° Gloss standard
Calibration value: 91.2%
What was indicated as overrange by the above glossiness measurement was regarded as having a metallic luster. The results are shown in the table of FIG. The samples of Examples 1 to 9 and Comparative Example 1 had a metallic luster, but the sample of Comparative Example 2 did not have a metallic luster.

Next, the wear resistance of the samples of Examples 1 to 9 and Comparative Examples 1 and 2 was evaluated by a steel wool test. The steel wool test is performed by a rubbing tester (manufactured by Kei Este Co., Ltd.) attached with steel wool (steel wool No. 0000), and the steel wool is pressed against the sample with a load of 200 gf and reciprocated 80 times with an amplitude of 30 mm. The case where no scratch was visually confirmed was accepted (denoted as “◯” in the table), and the case where a scratch was visually confirmed was regarded as unacceptable (denoted as “x” in the table). The results are shown in the table of FIG. All of the samples of Examples 1 to 9 passed, but the samples of Comparative Examples 1 and 2 failed because they were scratched by steel wool.

Example 10
A sample was prepared in the same manner as in Example 2 except that an ultraviolet curable coating layer was formed between the substrate and the aC: Ti film. The UV-curing coat layer was prepared by manually spray-coating a commercially available UV lacquer acrylic lacquer paint on a polycarbonate substrate. The film thickness of the ultraviolet curable coating layer was 8 μm.

Example 11
A sample was prepared in the same manner as in Example 8 except that an ultraviolet curable coating layer was formed between the substrate and the aC: Al film. The ultraviolet curable coating layer was produced by the spray coating method in the same manner as in Example 10. The film thickness of the ultraviolet curable coating layer was 8 μm.

Example 12
A sample was prepared in the same manner as in Example 10 except that a pigmented ultraviolet curable coating layer was formed between the ultraviolet curable coating layer and the aC: Ti film. The UV-cured coat layer containing the pigment was prepared by manually spray-coating a commercially available UV-curable clear coating composition with a blue pigment blended onto the UV-cured coat layer. The film thickness of the ultraviolet curable coating layer containing the pigment was 8 μm.

Example 13
A sample was prepared in the same manner as in Example 11 except that an ultraviolet curable coating layer containing a pigment was formed between the ultraviolet curable coating layer and the aC: Al film. The pigmented UV curable coating layer was prepared in the same manner as in Example 12. The film thickness of the ultraviolet curable coating layer containing the pigment was 8 μm.

Comparative Example 3
A sample was prepared in the same manner as in Example 11 except that an Al film was formed instead of the aC: Al film. The Al film was produced by the FCVA film forming apparatus 1 used in the examples. As the target 11, an Al target was used. As operating conditions of the FCVA film forming apparatus 1 when forming an Al film, the arc current of the arc power source (cathode side power source) in the arc plasma generation unit 10 is 160 A, and the current (filter current) of the electromagnetic coil 21 in the filter unit 20 is The current (anode current) of the anode side power source in the arc plasma generator 10 was 10.5 A, and the voltage (duct voltage) of the ion scanning coil 25 was 0.5 V. The bias power supply voltage was floating. The thickness of the Al film was set to 200 nm by controlling the film formation time.

Comparative Example 4
A sample was prepared in the same manner as in Comparative Example 3 except that an ultraviolet curable coating layer was formed on an Al film having a thickness of 20 nm. The ultraviolet curable coating layer was prepared by the spray coating method in the same manner as in Example 10. The film thickness of the ultraviolet curable coating layer was 8 μm. The thickness of the Al film was set to 20 nm by controlling the film formation time.

Comparative Example 5
A sample was prepared in the same manner as in Example 13 except that an Al film was formed instead of the aC: Al film. The Al film was produced in the same manner as in Comparative Example 3. The thickness of the Al film was set to 20 nm by controlling the film formation time.

Comparative Example 6
A sample was prepared in the same manner as in Comparative Example 5 except that an ultraviolet curable coating layer was formed on an Al film having a thickness of 20 nm. The ultraviolet curable coating layer was prepared by the spray coating method in the same manner as in Example 10. The film thickness of the ultraviolet curable coating layer was 8 μm. The thickness of the Al film was set to 20 nm by controlling the film formation time.

For the samples of Examples 10 to 13 and Comparative Examples 3 to 6 produced as described above, the presence or absence of metallic luster was measured in the same manner as in Example 1. The results are shown in the table of FIG. The samples of Examples 10 to 13 and Comparative Examples 3 and 5 in which the aC: M film or Al film having a metallic luster on the surface had a metallic luster, but the outermost surface had the metallic luster. The samples of Comparative Examples 4 and 6 on which the UV-cured coating layer was not formed did not have a metallic luster (metallic material feeling). The samples of Comparative Examples 4 and 6 seem to have a metallic texture at first glance, but because of the gloss from the metal film seen through the UV cured coating layer, It feels different from the metallic luster that can be felt when viewing. Thus, it can be seen that in order to obtain a metallic feel, it is necessary to dispose a layer having metallic luster on the outermost layer.

Next, the wear resistance of the samples of Examples 10 to 13 and Comparative Examples 3 to 6 was evaluated by a steel wool test in the same manner as in Example 1. The results are shown in the table of FIG. Although the samples of Examples 10 to 13 and Comparative Examples 4 and 6 in which the aC: M film or the UV-cured coating layer was formed on the outermost surface passed, the comparison in which the Al film was formed on the outermost surface The samples of Examples 3 and 5 were unacceptable because of scratches that could be visually confirmed with steel wool. It can be seen that when a soft (low hardness) metal film is placed on the uppermost layer, the film is easily scratched, resulting in poor wear resistance. When such a low abrasion-resistant film is used as a decorative film for a composite member, when the user uses the composite member, the surface of the decorative film is easily damaged or the decorative film is peeled off. There is a risk of damaging the appearance.

Furthermore, the hues of the samples of Examples 10 to 13 and Comparative Examples 3 to 6 were evaluated. The results are shown in the table of FIG. All of the samples of Examples 12 and 13 and Comparative Examples 5 and 6 provided with a pigment-containing UV-cured coating layer exhibited a pigment color. In Examples 12 and 13, since the film thickness of the aC: M film was 15 nm, that is, 20 nm or less, the hue of the pigment could be seen through the aC: M film.

As shown in the above evaluation results, the aC: M film used in the examples has wear resistance and metallic luster (metallic material feeling). A member having such an aC: M film formed on the surface has high appearance quality due to metallic luster and can maintain appearance quality for a long time due to high wear resistance. By producing a member having an aC: M film formed on the surface using a resin base material, a member having high design properties can be provided easily and inexpensively.
In the samples of Examples and Comparative Examples above, the amorphous carbon film doped with metal (aC: M film) is a tetrahedral amorphous carbon film doped with metal (ta-C: M film). Met. As described above, the ta-C: M film can be formed by the FCVA method using a carbon target containing a metal element.

The preferred embodiments and examples of the present invention have been described above, but the present invention is not limited to these embodiments and examples. For example, titanium and aluminum are shown as an example of the metal doping element M of aC: M. As will be understood by those skilled in the art from the above description, the metal doping element is a film based on aC. Any other metal element such as Ni, Cr, Mg, Cu, Fe, Ag, Au, or Pt may be used.

The part having the composite member of this embodiment can be applied to a wide range of uses. For example, digital cameras, optical devices such as binoculars and glasses, mobile phones, smartphones, portable music devices, portable video devices, etc., whose design elements such as shape and appearance are important factors that greatly influence the product value. Electronic devices.

DESCRIPTION OF SYMBOLS 1 Film-forming apparatus 10 Arc plasma production | generation part 11 Target 20 Filter part 21 Electromagnetic coil 23 Duct 25 Ion scanning coil 30 Film-forming chamber part 31 Holder 32 Base material 35 Motor 37 Power supply 60 Base material 80 Decoration film 100 Composite member 120 Transparent layer 140

Colored layer

200, 300, 400 Composite member

Claims

A composite member,
A substrate;
A decorative film covering the substrate;
A composite member in which the decorative film is amorphous carbon doped with metal and has a thickness of 10 nm or more.
The composite member according to claim 1, wherein the decorative film has a thickness of 300 nm or less.
The composite member according to claim 1 or 2, wherein the decorative film has an electrical resistivity in a range of 1 × 10 -5 Ωcm to 8 × 10 -3 Ωcm.
The composite member according to any one of claims 1 to 3, wherein the decorative film has a hardness of 10 GPa to 20 GPa.
The composite member according to any one of claims 1 to 4, further comprising a base layer between the base material and the decorative film.
The composite member according to claim 5, wherein the base layer includes a resin layer.
The composite member according to claim 5, wherein the base layer is a transparent layer and / or a colored layer.
The composite member according to claim 7, wherein the foundation layer includes the transparent layer and the colored layer, and the transparent layer is provided between the colored layer and the base material.
The composite member according to any one of claims 1 to 4, wherein the decorative film is directly provided on the base material.
The composite member according to claim 9, wherein the base material is a colored base material.
The composite member according to claim 7, 8 or 10, wherein the thickness of the decorative layer is 10 to 20 nm.
The composite member according to any one of claims 1 to 11, wherein the base material is plastic.
The composite member according to any one of claims 1 to 12, wherein the metal is titanium or aluminum.
The composite member according to any one of claims 1 to 13, wherein the base material is a camera housing part.
An optical instrument comprising the composite member according to any one of claims 1 to 14.
An electronic device comprising the composite member according to any one of claims 1 to 13.