阅读说明：本技术 装饰部件 (Decorative part ) 是由 林真一 甫立哲美 于 2018-04-20 设计创作，主要内容包括：本申请的装饰部件具有装饰面。并且,该装饰面的由粗糙度曲线求出的峰度Rku大于3,且由粗糙度曲线求出的切割水准25％的负载长度率Rmr与切割水准75％的负载长度率Rmr之间的高度方向的切割水准差Rδc为0.3μm以上。(The decoration component of the application has a decoration surface. The decorative surface has a kurtosis Rku, which is determined from a roughness curve, of greater than 3, and a height-direction cut level difference R δ c between a 25% load length rate Rmr at a cut level, which is determined from the roughness curve, and a 75% load length rate Rmr at the cut level, which is determined from the roughness curve, of 0.3 μm or more.)

1. A decorative member has a decorative surface, wherein the crest Rku of the decorative surface determined from a roughness curve is greater than 3, and the difference R δ c in the height direction between the load length rate Rmr at a cut level of 25% and the load length rate Rmr at a cut level of 75% determined from the roughness curve is 0.3 μm or more.

2. The decorative member according to claim 1, wherein the difference in cut level R δ c of the decorative surface is 0.5 μm or more.

3. The decorative member according to claim 1 or 2, wherein a ten-point average roughness Rz of the decorative surface obtained from a roughness curve is 3 μm or more and 8 μm or less.

4. The decorative member according to any one of claims 1 to 3, wherein a ratio Rq/Ra of an arithmetic average roughness Ra of the decorative surface determined from a roughness curve to a root mean square roughness Rq determined from a roughness curve is 1.6 or less.

5. The decorative member according to any one of claims 1 to 4, wherein a skewness Rsk of the decorative surface determined from a roughness curve is negative.

6. The decorative member according to any one of claims 1 to 5, wherein the decorative surface has a maximum valley depth Rv, which is determined from a roughness curve, of 2 μm or more and 4 μm or less.

7. The decorative member according to any one of claims 1 to 6, wherein the decorative surface is formed of ceramic.

Technical Field

The present application relates to trim components.

Background

For a decorative member requiring a matte appearance, an operation of forming fine irregularities on a surface to be a decorative article is performed. Such a surface having fine irregularities formed thereon is generally referred to as a "rough surface".

As a decorative member having such a rough surface, patent document 1 discloses a decorative member having a rough surface having irregularities of varying depth or height, and regarding the irregularities of varying depth or height, 7 to 100 convex portions having a height exceeding 2 from the average line are present, assuming that an arithmetic average roughness Ra value of the rough surface measured with a reference length of 10mm is 1.

Disclosure of Invention

The decoration component of the application has a decoration surface. The decorative surface has a kurtosis Rku, which is determined from a roughness curve, of greater than 3, and a height-direction cut level difference R δ c between a 25% load length rate Rmr at a cut level, which is determined from the roughness curve, and a 75% load length rate Rmr at the cut level, which is determined from the roughness curve, of 0.3 μm or more.

Detailed Description

The rough surface has fine irregularities on the surface, and therefore, if sebum is left in the concave portion when touched by a person, the appearance is impaired. Specifically, sebum at the time of human touch adheres in the form of a fingerprint. Therefore, in this case, in order to prevent the appearance from being impaired even when used for a long period of time, a decorative member having a decorative surface which is less likely to cause sebum residue when touched by a human and is less likely to be conspicuous even if sebum residue is present is desired.

The decorative member has a decorative surface which is not only hard to retain sebum when touched by a person, but also hard to be conspicuous even if the sebum is retained. Hereinafter, the decorative member of the present application will be described in detail.

The decoration component of the application has a decoration surface. The decorative surface has a kurtosis Rku of greater than 3 as determined from the roughness curve, and a difference R δ c in the height direction between a load length rate Rmr at a cut level of 25% (hereinafter, sometimes referred to as a load length rate Rmr25 for identification) and a load length rate Rmr at a cut level of 75% (hereinafter, sometimes referred to as a load length rate Rmr75 for identification) is 0.3 μm or more.

Here, the kurtosis Rku is an index of sharpness, which is a measure indicating the sharpness of the surface defined in JIS B0601 (2001). When the kurtosis Rku is larger than 3, the vicinity of the peak and the vicinity of the peak of the valley are sharp.

The load length ratio Rmr is: and a load length ratio represented by a percentage of a ratio of a sum of cut lengths obtained at this time to the reference length. Here, the cutting level means: a cutting level in which the ratio of the height of the above-mentioned reference length to the maximum height (the sum of the maximum peak height and the maximum valley depth shown in JIS B0601 (2001)) is expressed by percentage. In other words, the load length ratio Rmr at a cut level of 0% is 0%, and the load length ratio Rmr at a cut level of 100% is 100%.

Further, the height-direction cutting level difference R δ c between the load length rate Rmr25 and the load length rate Rmr75 represents a difference in cutting level between a height corresponding to the load length rate Rmr25 and a distance corresponding to the load length rate Rmr 75.

Further, since the decorative surface of the decorative member of the present invention has a peakedness Rku of more than 3, sebum is less likely to remain on the slope of the bottom portion (hereinafter referred to as valley bottom) of the valley portion of the decorative surface when a person touches the decorative surface. On the other hand, when the kurtosis Rku of the decorative surface is 3 or less, sebum tends to remain on the slope facing the bottom of the valley of the decorative surface.

Further, the decorative member of the present application has a cut level difference R δ c of the decorative surface of 0.3 μm or more, and therefore, even if sebum remains on the slope toward the bottom of the valley, the appearance of the sebum is difficult to observe. On the other hand, when the height direction cutting level difference R δ c between the load length ratio Rmr25 and the load length ratio Rmr75 of the decorative surface is less than 0.3 μm, if sebum remains on the slope surface facing the valley bottom, the sebum is easily observed, and the remaining sebum becomes conspicuous.

Therefore, the decorative member of the present application satisfies the above configuration, and therefore, not only does sebum hardly remain when touched by a person, but also sebum hardly remains conspicuous even if the sebum remains.

In addition, as for the decorative surface, if the height direction cutting level difference R δ c between the load length ratio Rmr25 and the load length ratio Rmr75 is 0.5 μm or more, even if sebum remains on the slope surface facing the valley bottom, the remaining sebum is less likely to be observed.

Here, the height direction cutting level difference R δ c between the kurtosis Rku, the load length ratio Rmr25, and the load length ratio Rmr75 can be obtained by measurement in accordance with JIS B0601 (2001). As the measurement conditions, for example, a laser microscope is used, and the measurement mode may be a color super depth, a magnification may be 1000 times, a pitch may be 0.02 μm, and a gain (gain) may be 953. In addition, at least 5 points or more are measured at a portion of the decorative surface having a smaller inclination than other portions. Then, the data indicating the maximum value and the data indicating the minimum value are removed from the measured data, and the average value of the data is obtained.

Further, the ten-point average roughness Rz of the decorative surface of the decorative member of the present application, which is determined from the roughness curve, may be 3 μm or more and 8 μm or less. Here, the ten-point average roughness Rz represents the following roughness specified in JIS B0601 (2001): a reference length is extracted from a roughness curve along a direction of an average line, and in the roughness curve of the extracted portion, the sum of an average of heights of portions which become peaks from a maximum peak height to a 5 th peak height and an average of depths of portions which become valleys from a lowest valley depth to a 5 th valley depth is added. If such a constitution is satisfied, sebum is less likely to remain on the slope toward the bottom of the valley or the top of the peak (hereinafter referred to as the peak top) of the decorative surface, and even if sebum remains, the sebum is less likely to be conspicuous.

Further, as for the decorative surface, if the arithmetic average roughness Ra obtained from the roughness curve is 0.1 μm or more and 0.7 μm or less, the appearance of the decorative surface is more excellent.

In the decorative member of the present application, a ratio Rq/Ra of an arithmetic average roughness Ra obtained from a roughness curve of the decorative surface to a root mean square roughness Rq obtained from the roughness curve may be 1.6 or less. If such a configuration is satisfied, the portion of the decorative surface that becomes the protruding peak is small, and therefore, sebum is less likely to remain on the decorative surface when a person touches the decorative surface.

In the decorative member of the present application, the skewness Rsk of the decorative surface obtained from the roughness curve may be negative. Here, skewness Rsk means: the average height of roughness defined in JIS B0601 (2001) is defined as an index indicating a ratio of a portion which becomes a peak to a portion which becomes a valley with respect to the center line. If the skewness Rsk is negative, it means that the region of the portion that becomes the peak is larger than the portion that becomes the trough. If such a configuration is satisfied, the slope of the slope surface toward the valley bottom becomes large in the decorative surface, and even if sebum remains on the slope surface toward the valley bottom when touched by a person, the sebum is less likely to be observed.

The decorative surface of the decorative member of the present application may have a maximum valley depth Rv determined from a roughness curve of 2 μm or more and 4 μm or less. Here, the maximum valley depth Rv means: the maximum depth of a valley portion of a reference length is extracted from the roughness curve in the direction along the average line as defined in JIS B0601 (2001). If such a constitution is satisfied, not only sebum is less likely to adhere to the surface of the decorative material when touched by a person, but also dust and the like are less likely to enter the bottom of the grain, and therefore the decorativeness of the decorative material is less likely to be impaired.

Here, the ten-point average roughness Rz, the arithmetic average roughness Ra, the root mean square roughness Rq, the skewness Rsk, and the maximum valley depth Rv can be calculated by the same measurement method as the kurtosis Rku and the cutting level difference R δ c.

The decorative member of the present invention may be made of any material such as metal or resin, and if it is made of ceramic or cermet, the decorative member of the present invention is less likely to be damaged and to lose its aesthetic appearance even in long-term use, and provides a high-grade feeling and a satisfactory aesthetic feeling to consumers.

Here, as the ceramic, for example, zirconia, alumina, silicon nitride, silicon carbide, or a composite thereof can be used. As a method of forming the decorative surface with ceramic, a base body of a decorative member is made of metal, resin, or the like as a member having a decorative surface, and the surface thereof is coated with ceramic to form the decorative surface. Alternatively, a member having a decorative surface may be made of ceramic and bonded to a base such as metal or resin. Alternatively, the trim part itself can also be made of ceramic. The ceramic may contain a pigment component for coloring. Examples of the cermet include titanium compounds such as titanium carbide (TiC) and titanium nitride (TiN).

The material constituting the decorative surface may be determined by measuring with an X-ray diffraction apparatus (XRD: D8 ADVANCE manufactured by Bruker AX, for example) and identifying the obtained value of 2 θ (2 θ is the diffraction angle) using JCPDS card. The decorative surface may be observed with a Scanning Electron Microscope (SEM), and the material constituting the decorative surface may be estimated using an energy dispersive X-ray spectrometer (EDS) attached to the SEM.

The decorative part of the present invention can be used not only as an ornament and furniture, but also as a part that is frequently touched by a human hand, such as a wristwatch, a mobile terminal, a medical terminal, and a door handle; fingerprint sensor-unlocking devices, parts such as door unlocking buttons of moving vehicles such as automobiles, etc. in which sebum is likely to remain; or components seeking decorative value.

Hereinafter, a method for manufacturing a decorative member according to the present application will be described. Here, a decorative member made of zirconia will be described as an example.

First, a sintered body made of zirconia was prepared. Next, a surface of the sintered body was ground by a surface grinder. Next, the ground surface is barrel-polished for a treatment time of 10 hours to 60 hours.

At this time, the decorative member of the present application having a decorative surface with a peakedness degree Rku of more than 3 and a height direction cutting level difference R δ c between the load length ratio Rmr25 and the load length ratio Rmr75 of 0.3 μm or more can be obtained by performing grinding processing using a grinding stone having a grain size number of #400 or less and then performing barrel grinding using an abrasive material having a grain size number of #150 or less as a polishing agent. The material of the abrasive used for the barrel polishing may be green silicon carbide, boron carbide, or the like.

Further, in order to make the ten-point average roughness Rz of the decorative surface be 3 μm or more and 8 μm or less, barrel polishing may be performed using a triangular prism-shaped polishing stone.

Further, the roll polishing may be performed for 20 hours or more so that the ratio Rq/Ra of the arithmetic average roughness Ra to the root mean square roughness Rq of the decorative surface is 1.6 or less.

In order to make the skewness Rsk of the decorative surface negative, boron carbide having a higher hardness than green silicon carbide may be used as a material of the abrasive used for barrel polishing.

In addition, in order to make the maximum valley depth Rv of the decorative surface 2 μm or more and 4 μm or less, zero cut (zero cut) may be performed 2 to 4 times after the grinding. The zero-cut processing is a processing method in which a grinding stone is moved from one end of a surface to the other end of the surface so as to be parallel to the surface subjected to the grinding processing without generating a cut mark. Further, moving the surface from one end to the other end of the ground surface 1 time is referred to as performing zero-cut 1 time.