JP6622076B2 - Vehicle display device - Google Patents

Description

  The present invention relates to a resin molded product and a vehicle display device.

  As a resin molded product applied to a vehicle or the like, for example, Patent Document 1 discloses a thermoplastic resin molded product obtained from an injection mold in which at least a part of a cavity surface is subjected to embossing. Yes. The embossed surface of the injection mold for molding this thermoplastic resin molded product is composed of two or more concavo-convex portions where the concavities and convexities become smaller on the upper layer side, and the uppermost concavities and convexities are innumerable with a fine acute angle shape. In the three-dimensional surface roughness parameter of the embossed surface, the arithmetic average roughness Sa is 1 μm ≦ Sa <10 μm, and the kurtosis degree Sku of the surface height distribution is 3 ≦ Sku ≦ 8.

JP 2012-086453 A

  By the way, such a resin molded product may be applied to, for example, a vehicle display device mounted on a vehicle. In such a case, the gloss of the surface in a region that can enter the field of view of an occupant or the like ( By suppressing (gloss), for example, it may be possible to create a high-class appearance. In this case, it is expected that the resin molded product can suppress the gloss of the surface without coating without using coating or the like, for example, in order to suppress the man-hours at the time of manufacture.

  This invention is made | formed in view of said situation, Comprising: It aims at providing the resin molded product which can suppress the glossiness of the surface, and the display apparatus for vehicles.

  In order to achieve the above object, the resin molded product according to the present invention has a surface roughness of 1.0 μm or more and 10.0 μm or less, and a skewness representing symmetry of the surface height distribution of greater than 0 and 5.0 or less. A plurality of fine irregularities having a gloss value of 2 or less at an incident angle of 85 ° are molded on the surface.

  In the resin molded product, the plurality of fine irregularities may have a surface roughness of 2.0 μm to 10.0 μm and a skewness of 0.7 to 5.0.

In order to achieve the above object, a vehicle display device according to the present invention is mounted on a vehicle, and is positioned between a display unit that displays information related to the vehicle, a light source unit included in the display unit, and a viewing position. And a skewness that is provided on a standing surface that protrudes along the direction in which the light source unit and the viewing position are aligned, and that has a surface roughness of 1.0 μm or more and 10.0 μm or less and that represents symmetry of the surface height distribution. By forming a plurality of fine irregularities satisfying a large value of 5.0 or less on the surface, the surface on which the plurality of fine irregularities are molded is defined as a surface having a gloss value of 2 or less at an incident angle of 85 °. The surface roughness is an arithmetic average roughness Sa of the surface on which the fine irregularities are molded, and the skewness is a degree of deviation of the surface height distribution on the surface on which the fine irregularities are molded. this is a Ssk The features.

  The resin molded product and the vehicle display device according to the present invention can scatter incident light on the surface by a plurality of fine irregularities molded on the surface, so that the gloss of the surface can be suppressed. Play.

FIG. 1 is a perspective view illustrating a schematic configuration of a vehicle display device to which a resin molded product according to an embodiment is applied. FIG. 2 is a schematic perspective view for explaining the surface roughness of fine irregularities in the resin molded product according to the embodiment. Drawing 3 is a mimetic diagram explaining the skewness of the fine unevenness in the resin molded product concerning an embodiment. FIG. 4 is a schematic diagram for explaining the 85 ° gloss value in the resin molded product according to the embodiment. FIG. 5 is a diagram illustrating an actual measurement result of the influence of the surface roughness and skewness of a plurality of fine irregularities on the 85 ° gloss value in the resin molded product according to the example. FIG. 6 is a perspective view showing a schematic configuration of a vehicle display device to which a resin molded product according to a modification is applied.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

[Embodiment]
FIG. 1 is a perspective view illustrating a schematic configuration of a vehicle display device to which a resin molded product according to an embodiment is applied. FIG. 2 is a schematic perspective view for explaining the surface roughness of fine irregularities in the resin molded product according to the embodiment. Drawing 3 is a mimetic diagram explaining the skewness of the fine unevenness in the resin molded product concerning an embodiment. FIG. 4 is a schematic diagram for explaining the 85 ° gloss value in the resin molded product according to the embodiment. FIG. 5 is a diagram illustrating an actual measurement result of the influence of the surface roughness and skewness of a plurality of fine irregularities on the 85 ° gloss value in the resin molded product according to the example. FIG. 6 is a perspective view showing a schematic configuration of a vehicle display device to which a resin molded product according to a modification is applied.

  As shown in FIG. 1, the resin molded product 1 according to the present embodiment is applied to a vehicle display device 100 mounted on a vehicle. The vehicle display device 100 of the present embodiment constitutes a so-called on-vehicle meter, and is mounted on an instrument panel provided on a dashboard of the vehicle, for example, as information used for driving the vehicle. Various information is displayed. The vehicle display device 100 includes a display unit 101 that is mounted on a vehicle and displays information related to the vehicle, and a resin molded product 1 provided around the display unit 101. And the display apparatus 100 for vehicles is suppressing the glossiness of the surface by shape | molding the several fine unevenness | corrugation 2 (refer FIG. 2 etc.) on the surface of the resin molded product 1. FIG.

  The width direction of the vehicle display device 100 shown in FIG. 1 typically corresponds to the vehicle width direction of the vehicle to which the vehicle display device 100 is applied. In the following description, in the width direction of the vehicular display device 100, the left side (left side in FIG. 1) is the left side in the width direction and the right side (right side in FIG. 1) is the width direction. Sometimes called the right side. The depth direction of the vehicle display device 100 shown in FIG. 1 typically corresponds to the front-rear direction of the vehicle to which the vehicle display device 100 is applied. Further, the front side of the vehicle display device 100 is the side facing the driver's seat of the vehicle, and is typically the side visually recognized by the driver sitting in the driver's seat. A visual position 108 described later is located on the front side in the depth direction of the vehicle display device 100. On the other hand, the back side of the vehicle display device 100 is the side opposite to the front side in the depth direction, and is typically the side accommodated inside the instrument panel.

  The display unit 101 includes a light source unit 102, and displays various types of information regarding the vehicle using light emitted from the light source unit 102. The display unit 101 displays various information used for driving the vehicle, such as vehicle speed, the output rotational speed of the driving power source, the accumulated traveling distance, a warning display (so-called tell tale), a shift position indicator, and the like. indicate. Here, as an example, two display units 101 are provided at intervals along the width direction. Each of the display units 101 includes a light source unit 102, a dial plate 103, a pointer 104, and the like. This is an analog instrument that displays a measured value in an analog manner by the pointer 104. The light source unit 102 is disposed on the back side of the dial 103 in the depth direction. On the dial 103, as information about the vehicle, for example, an indicator portion indicating a measured value such as a speed and an output rotational speed and indicated by a pointer 104, a warning display design, and the like are drawn. The dial plate 103 is, for example, a polycarbonate sheet made of a transparent fabric, and is printed with a shape corresponding to the indicator portion, the warning display pattern, or the like with dark ink. The light source unit 102 includes a light source body such as an LED element, and a diffusion plate that diffuses light emitted from the light source body toward the dial 103 side. In each display unit 101, the light emitted from the light source unit 102 passes through a portion of the dial plate 103 where the index unit and the warning display symbol are cut out, so that the index unit and the warning display symbol are displayed. Display state. The indicator portion indicated by the pointer 104 includes an arc along the rotation trajectory of the tip of the pointer 104, and a plurality of scales, numbers, and the like attached at equal intervals along the arc. The pointer 104 is located on the front side in the depth direction of the dial plate 103, and is rotated by driving a motor provided in the housing 101a constituting the vehicle display device 100, so that various measurement values (speed, The predetermined position of the indicator portion is indicated according to the output rotational speed or the like. Each display unit 101 indicates the current speed and output rotation speed by a pointer 104. The display unit 101 only has to have the light source unit 102 and display various information about the vehicle by the light source unit 102, and may be configured by a liquid crystal display device or the like, for example.

  The resin molded product 1 is provided around the display unit 101. The resin molded product 1 of this embodiment is applied to the facing plate 105 of the vehicle display device 100. The facing plate 105 is a frame-like member that is assembled on the front side in the depth direction of the housing 101a and surrounds the dial plate 103 or the like to press the dial plate 103 or the like. In the vehicular display device 100, the facing plate 105 is exposed on the front side in the depth direction and serves as a decorative material that can enter the field of view of an occupant including the driver. The facing plate 105 includes an enclosure surface 106 as a viewing position facing surface that surrounds each display unit 101, and a standing surface 107 that is erected along the depth direction from the edge of the enclosure surface 106. The surrounding surface 106 is a surface that has a notch in a portion corresponding to each display unit 101 and that exposes each display unit 101 from the notch. The standing surface 107 is a surface that protrudes from the edge of the surrounding surface 106 along the depth direction. That is, the surrounding surface 106 is positioned between the light source unit 102 included in the display unit 101 and the viewing position 108 such as an occupant in the depth direction, and the arrangement direction of the light source unit 102 and the viewing position 108, that is, the depth. It is formed as a surface that intersects the direction, more specifically, a surface that faces the viewing position 108 along the depth direction. On the other hand, the standing surface 107 is positioned between the light source unit 102 included in the display unit 101 and the viewing position 108 such as an occupant with respect to the depth direction, and the arrangement direction of the light source unit 102 and the viewing position 108, that is, the depth. It protrudes toward the driver along the direction. Here, a total of four standing surfaces 107 are provided, one each along the width direction on the upper and lower sides of the surrounding surface 106 in the vertical direction, and one each along the vertical direction on the left and right sides of the surrounding surface 106 in the width direction. However, it is not limited to this.

  The resin molded product 1 according to the present embodiment is applied to at least each standing surface 107, so that the standing surface 107 is configured by the surface on which the plurality of fine irregularities 2 are molded. The reflection of light incident on the surface 107 is suppressed, and the gloss of the standing surface 107 is suppressed. That is, in this case, the resin molded product 1 applied to the standing surface 107 is disposed at a position where light is inclined and incident from the side opposite to the viewing position 108 with respect to the surface on which the plurality of fine irregularities 2 are molded. The Rukoto. Further, here, the resin molded product 1 is also applied to the enclosure surface 106, so that the enclosure surface 106 is constituted by the surface on which the plurality of fine irregularities 2 are molded, and thus the enclosure is performed as reflected light such as external light. The reflection of light incident on the surface 106 is suppressed, and the gloss of the surrounding surface 106 is suppressed. That is, in this case, the resin molded product 1 applied to the surrounding surface 106 is disposed at a position where light enters from the viewing position 108 side with respect to the surface on which the plurality of fine irregularities 2 are molded.

  Hereinafter, the resin molded product 1 will be specifically described.

The plurality of fine irregularities 2 molded on the surface of the resin molded product 1 shown in FIG. 2 and the like have at least the following conditions in which the surface roughness Sa due to the plurality of fine irregularities 2 and the skewness Ssk due to the plurality of fine irregularities 2 are: 1 is formed.

(Condition 1) The surface roughness Sa is 1.0 μm or more and 10.0 μm or less, and the skewness Ssk representing the symmetry of the surface height distribution is greater than 0 and 5.0 or less (1.0 μm ≦ Sa ≦ 10.0 μm, and , 0 <Ssk ≦ 5.0).

  Here, the surface roughness Sa of the plurality of fine irregularities 2 is an index (parameter) representing the depth (height) of the fine irregularities 2 and corresponds to the smoothness of the surface on which the fine irregularities 2 are molded. It can be expressed by an index. Here, the surface roughness Sa is the arithmetic average roughness Sa. The arithmetic average roughness Sa here is an index obtained by extending the two-dimensional arithmetic average roughness Ra to three dimensions, and represents the average of the absolute values of Z (x, y) in the measurement target region A (FIG. 2). reference). In the three-dimensional display diagram, the three-dimensional arithmetic average roughness Sa corresponds to the arithmetic average of the measurement target region A in a state where the valley portion is changed to the peak portion by the absolute value conversion. The arithmetic average roughness Sa, that is, the surface roughness Sa can be expressed by, for example, the following mathematical formula (1).

  The surface roughness (arithmetic average roughness) Sa of the plurality of fine irregularities 2 can be measured by a predetermined surface roughness measurement method set in advance. The plurality of fine irregularities 2 molded on the surface of the resin molded product 1 are molded so that the surface roughness Sa measured by a predetermined surface roughness measuring method set in advance satisfies the above condition 1.

  In addition, as a predetermined surface roughness measuring method set in advance for measuring the surface roughness Sa of the plurality of fine irregularities 2, as an example, a measuring instrument used for measuring the surface roughness Sa of the fine irregularities 2 is “ A method using “3D measurement laser microscope LEXT OLS4000” manufactured by Olympus Corporation is used. In this case, in the “3D measurement laser microscope LEXT OLS4000 manufactured by Olympus Corporation”, the “surface roughness analysis” function is selected as the measurement function, the “roughness parameter” is selected as the analysis parameter, and the swell component as the noise removal function The “Galcian filter (noise filter)” function is selected with a cut-off frequency for removing the noise of 80 μm. Then, an image of the surface of the resin molded product 1 was taken at a measurement magnification of 20 times with “3D measurement laser microscope LEXT OLS4000 manufactured by Olympus Corporation”, and the surface roughness (arithmetic average roughness) of the plurality of fine irregularities 2 Sa is measured.

  On the other hand, the skewness Ssk of the plurality of fine irregularities 2 is an index (parameter) representing the symmetry of the surface height distribution by the plurality of fine irregularities 2, in other words, the surface height of the surface on which the fine irregularities 2 are molded. It can be said that it is an index representing the degree of skew of the distribution (skewness of the scale limited surface). The skewness Ssk here is the skewness of the roughness curve in three dimensions, and is an index obtained by extending the skewness Rsk of the roughness curve in two dimensions to three dimensions. The skewness Rsk in two dimensions is expressed as Z (x) at a reference length made dimensionless by the cube of the root mean square height Rq (an index representing the root mean square of Z (x) at the reference length l). Means the so-called skewness, and represents the symmetry between the peak and valley when the average line is the center. The skewness Rsk in two dimensions can be expressed by, for example, the following formula (2).

  The two-dimensional skewness Rsk represented by the above formula (2) indicates that it is symmetric (normal distribution) with respect to the average line when Rsk = 0. Further, the skewness Rsk in two dimensions is biased downward with respect to the average line as shown in the upper part of FIG. 3 when Rsk> 0, that is, a positive value larger than 0, typically, The peak side is sharp and the valley side is curved. The larger the absolute value, the greater the degree. Further, when the skewness Rsk in two dimensions is Rsk <0, that is, a negative value smaller than 0, the skewness Rsk is biased upward with respect to the average line as shown in the lower part of FIG. It represents that the valley side is sharp and the mountain side is curved, and the greater the absolute value, the greater the degree.

  The skewness Ssk obtained by expanding the two-dimensional skewness Rsk into three dimensions is obtained by the cube of the root mean square height Sq (an index representing the root mean square of Z (x, y) in the measurement target region A). In the non-dimensional reference plane, it represents the cube mean of Z (x, y), in other words, the so-called skewness, and the symmetry between the peak and valley when the average plane is the center. Represents sex. The skewness Ssk in three dimensions can be expressed by, for example, the following mathematical formula (3).

  Similarly to the skewness Rsk in the two dimensions, the skewness Ssk in the three dimensions represented by the above formula (3) indicates that it is symmetric (normal distribution) with respect to the average plane when Ssk = 0. Further, the skewness Ssk in the three dimensions is biased downward with respect to the average plane when Ssk> 0, that is, a positive value larger than 0, typically, the peak side is sharp and the valley It represents that the part side has a curved surface shape, and the greater the absolute value, the greater the degree. Further, when the skewness Ssk in the three dimensions is Ssk <0, that is, a negative value smaller than 0, the skewness Ssk is biased upward with respect to the average surface, typically, the valley side is sharp and the peak portion It represents that the side is curved, and the greater the absolute value, the greater the degree.

  The skewness Ssk of the plurality of fine irregularities 2 can be measured by a predetermined skewness measurement method set in advance. The plurality of fine irregularities 2 molded on the surface of the resin molded product 1 is set so that the skewness Ssk measured by a predetermined skewness measurement method set in advance satisfies the above condition 1, that is, lower than the average surface. It is formed so that the peak side is pointed and the valley side is curved.

  As a predetermined skewness measurement method set in advance for measuring the three-dimensional skewness Ssk of the plurality of fine irregularities 2, as an example, similar to the aforementioned predetermined surface roughness measurement method, A method using “3D measurement laser microscope LEXT OLS4000” manufactured by Olympus Corporation is used as a measuring instrument used for measuring skewness Ssk in three dimensions. In this case, in the “3D measurement laser microscope LEXT OLS4000 manufactured by Olympus Corporation”, the “surface roughness analysis” function is selected as the measurement function, the “roughness parameter” is selected as the analysis parameter, and the swell component as the noise removal function The “Galcian filter (noise filter)” function is selected with a cut-off frequency for removing the noise of 80 μm. Then, an image of the surface of the resin molded product 1 is taken at a measurement magnification of 20 times with “3D measurement laser microscope LEXT OLS4000 manufactured by Olympus Corporation”, and the skewness Ssk in the three dimensions of the plurality of fine irregularities 2 is measured.

  The fine unevenness 2 satisfying the above condition 1 is integrally molded without coating by transferring the unevenness formed on the resin molding die to the surface of the resin molded product 1 at the time of molding. As a material used as the resin molded product 1, for example, various synthetic resins can be used.

  The resin molded product 1 of the present embodiment has a plurality of fine irregularities 2 that satisfy the above-described condition 1 formed on the surface, so that the surface on which the plural minute irregularities 2 are molded has a gloss value at an incident angle of 85 °. (Hereinafter, it may be referred to as “85 ° gloss value”) can be a surface with 2 or less. Typically, the surface on which the plurality of fine irregularities 2 are molded satisfies the above condition 1 and becomes a surface having an 85 ° gloss value of greater than 0 and 2 or less. In other words, from a different viewpoint, the resin molded product 1 of the present embodiment has a surface roughness Sa at which the gloss value at an incident angle of 85 ° is greater than 0 and 2 or less, and a plurality of fine irregularities 2 having skewness Ssk on the surface. It has been molded.

Here, the gloss value is an index indicating the degree of surface gloss (in other words, an index indicating how much of the incident light is reflected). The gloss (gloss) can typically refer to the definition of gloss according to the JIS standard. In this case, the reflectance on the glass surface having a refractive index of 1.567 (mirror reflectance of 10% at an incident angle of 60 °) over the entire visible wavelength is defined as 100% gloss. The gloss value can be calculated using, for example, the following mathematical formula (4) from the measurement result of the luminance (candela) of the light reflected from the measurement surface.

Gross value = (Measurement result of actual brightness of measurement surface / Measurement result of brightness when measurement surface is glass surface with refractive index of 1.567) × 100 (4)

The higher the gloss value, the higher the reflectance on the surface and the relatively glossy appearance, while the lower the gloss value, the lower the reflectance on the surface. Represents a relatively matte and matte appearance.

  The gloss value at an incident angle of 85 ° (85 ° gloss value) is from the normal direction of the measurement surface (the surface on which a plurality of fine irregularities 2 are molded in the resin molded product 1), as illustrated in FIG. The amount of light received by the evaluation surface at a position inclined by 85 ° from the normal direction of the measurement surface opposite to the light source after the light emitted from the light source at a position inclined by 85 ° is reflected by the measurement surface. . The 85 ° gloss value can be measured by, for example, “micro-TRI-gloss” manufactured by BYK Gardner (Big Gardner).

  In addition to the 85 ° gloss value, a gloss value at an incident angle of 20 °, a gloss value at an incident angle of 60 °, or the like is generally used as the gloss value. Here, the gloss value at an incident angle of 85 ° is used as a reference. There are the following advantages. That is, in the vehicular display device 100 mounted on a vehicle, the light source unit 102, the standing surface 107 of the facing plate 105, and the viewing position 108 are reflected on the standing surface 107 due to the geometrical arrangement. The incident angle of the light that reaches 108 with respect to the standing surface 107 tends to be around 85 °. For this reason, by evaluating the gloss of the surface based on the gloss value at the incident angle of 85 °, the actual viewing angle of the driver or the like based on the usage state of the vehicle display device 100 in the vehicle is taken into consideration. Gloss evaluation can be performed. Further, the gloss value at an incident angle of 85 ° tends to easily change depending on the surface roughness Sa, the skewness Ssk, etc. of the fine unevenness 2 as compared with the gloss value at an incident angle of 20 °, the gloss value at an incident angle of 60 °, and the like. It is in. For this reason, by evaluating the gloss of the surface based on the gloss value at the incident angle of 85 °, the gloss value at the incident angle of 20 ° and the gloss value at the incident angle of 60 ° can substantially satisfy the required values. It becomes.

  As the surface roughness Sa of the plurality of fine irregularities 2 becomes relatively large, the 85 ° gloss value tends to be relatively low, and the gloss is suppressed to become low gloss. In addition, the skewness Ssk of the plurality of fine irregularities 2 tends to be relatively low as the 85 ° gloss value is relatively low and gloss is suppressed. The above condition 1 corresponds to a range in which [0 <85 ° gloss value ≦ 2] can be achieved in the relationship between the surface roughness Sa and the skewness Ssk of the plurality of fine irregularities 2.

  In addition, the [upper limit value of surface roughness Sa = 10.0 μm] in the above-described condition 1 is, for example, a mold capable of properly pulling out a mold after molding the fine unevenness 2 with a required shape and size. It is a value that is determined according to an upper limit value in a range that can be manufactured, such as a limit value in molding. Similarly, the [upper limit value of skewness Ssk = 5.0] in the above-described condition 1 is, for example, a mold capable of properly pulling out the mold after molding the fine unevenness 2 with a required shape and size. It is a value that is determined according to an upper limit value in a range that can be manufactured, such as a limit value in molding.

Here, it is more preferable that the resin molded product 1 satisfies the following condition 2 that further restricts the condition 1 described above.

(Condition 2) The surface roughness Sa is 2.0 μm or more and 10.0 μm or less, and the skewness Ssk representing the symmetry of the surface height distribution is 0.7 or more and 5.0 or less (2.0 μm ≦ Sa ≦ 10.0 μm, And 0.7 ≦ Ssk ≦ 5.0).

Thereby, as for the resin molded product 1, the surface by which the some fine unevenness | corrugation 2 was shape | molded is made into the surface where 85 degree gloss value is more than 0 and becomes 2 or less, for example, the surface where it is more than 0 and becomes 1 or less. be able to.

  Here, FIG. 5 is an actual measurement result of the influence of the surface roughness Sa and the skewness Ssk of the plurality of fine irregularities on the 85 ° gloss value. The actual measurement results are “Example 1” to “Example 4”, “Comparative Example 1” to “Comparative Example” in which a plurality of fine irregularities are actually molded with a predetermined surface roughness Sa and a predetermined skewness Ssk. 11 ”is manufactured, and the actual measurement value obtained by actually measuring the 85 ° gloss value of the surface is shown. Here, the surface roughness Sa, the skewness Ssk, and the 85 ° gloss value Gs are respectively calculated using “3D measurement laser microscope LEXT OLS4000” manufactured by Olympus Corporation and “micro-TRI-gloss” manufactured by BYK Gardner (Big Gardner). Measured. The surface roughness Sa and the skewness Ssk were measured by using the surface roughness measurement method and the skewness measurement method described above.

  In FIG. 5, “Example 1” to “Example 3” are paint-less resin molded products in which a plurality of fine irregularities satisfying both the above-described conditions 1 and 2 are integrally formed on the surface. “Example 4” is a resin-less resin-coated product in which a plurality of fine irregularities satisfying only the condition 1 described above are integrally molded on the surface. On the other hand, “Comparative Example 1” to “Comparative Example 11” in FIG. 5 are paint-less resin molded products in which a plurality of fine irregularities that do not satisfy both of the above-described conditions 1 and 2 are integrally molded on the surface. .

  As is apparent from the actual measurement results of FIG. 5, “Comparative Example 1” to “Comparative Example 11” that do not satisfy both of the above-described condition 1 and condition 2 have an 85 ° gloss value larger than 2 and surface gloss. It is clear that it has not been suppressed. For example, in “Comparative Example 1” to “Comparative Example 4”, both the surface roughness Sa and the skewness Ssk do not satisfy the above-described condition 1, the 85 ° gloss value is larger than 2, and the surface gloss can be suppressed. Not. Further, for example, in “Comparative Example 5” to “Comparative Example 8”, the skewness Ssk satisfies the above-described condition 1, but the surface roughness Sa does not satisfy the above-described condition 1, and in this case as well, 85 °. The gloss value is larger than 2, and the surface gloss cannot be suppressed. Further, for example, in “Comparative Example 9” to “Comparative Example 11”, the surface roughness Sa satisfies the condition 1 described above, but the skewness Ssk does not satisfy the condition 1 described above, and in this case also 85 °. The gloss value is larger than 2, and the surface gloss cannot be suppressed.

  On the other hand, as is clear from the actual measurement result of FIG. 5, in “Example 1” to “Example 4” satisfying the above-described condition 1, the 85 ° gloss value is suppressed to greater than 0 and less than 2, and the surface It is clear that the gloss is suppressed. Furthermore, among “Example 1” to “Example 4”, “Example 1” to “Example 3” satisfying both the conditions 1 and 2 have an 85 ° gloss value larger than 0 and 1 It is apparent that the gloss of the surface is suppressed more suitably.

  According to the resin molded product 1 described above, the surface roughness Sa is 1.0 μm or more and 10.0 μm or less, the skewness Ssk representing the symmetry of the surface height distribution is greater than 0 and 5.0 or less, and the incident angle is 85. A plurality of fine irregularities 2 having a gloss value at 2 or less are molded on the surface.

  According to the vehicle display device 100 described above, the display unit 101 that is mounted on the vehicle and displays information related to the vehicle, the light source unit 102 included in the display unit 101, and the viewing position 108, and a light source. The surface roughness Sa is 1.0 μm or more and 10.0 μm or less and the skewness Ssk representing the symmetry of the surface height distribution is 0. And a resin molded product 1 on which a plurality of fine irregularities 2 having a gloss value of 5.0 or less and a gloss value of 2 or less at an incident angle of 85 ° are molded.

  Therefore, since the resin molded product 1 and the vehicle display device 100 can scatter incident light on the surface by the plurality of fine irregularities 2 molded on the surface, the gloss of the surface can be suppressed. More specifically, the resin molded product 1 and the vehicle display device 100 have a surface roughness Sa of 1.0 μm or more and 10.0 μm or less, and a skewness Ssk of greater than 0 and 5.0 or less. On the surface, a plurality of fine irregularities 2 are formed such that the peak side is sharp and the valley side is curved. Thereby, the resin molded product 1 and the vehicle display device 100 can easily scatter reflected light by the plurality of fine irregularities 2 having sharpened tips. In this case, the resin molded product 1 and the vehicle display device 100 are provided so as to protrude along the direction in which the light source unit 102 and the visual position 108 are aligned, and are visually observed on the surface on which the plurality of fine irregularities 2 are molded. By applying the resin molded product 1 to the standing surface 107 disposed at a position where light is incident with an inclination from the side opposite to the position 108, the scattering effect of reflected light is exerted on the standing surface 107. This is more remarkable and the surface gloss can be more significantly suppressed.

  As a result, the resin molded product 1 and the vehicle display device 100 can suppress the gloss of the surface in the field of view of the occupant including the driver in the vehicle, for example, and reduce the plastic feeling that tends to give a cheap image. It is possible to create a high-class appearance. Further, the resin molded product 1 and the vehicle display device 100 can suppress the gloss of the surface by a plurality of fine irregularities 2 molded on the surface, and can suppress the gloss of the surface in the same manner as those painted without using paint or the like. The effect can be realized. As a result, the resin molded product 1 and the vehicle display device 100 can reduce the number of man-hours for manufacturing as compared with the case where, for example, painting is performed, and the manufacturing cost can be suppressed.

  Furthermore, according to the resin molded product 1 and the vehicle display device 100 described above, the plurality of fine irregularities 2 have a surface roughness Sa of 2.0 μm to 10.0 μm and a skewness Ssk of 0.7 to 5. 0.0 or less is preferable. In this case, in the resin molded product 1 and the vehicle display device 100, the surface on which the plurality of fine irregularities 2 are molded can be a surface having an 85 ° gloss value of 1 or less, and the surface gloss can be further suppressed. .

  The resin molded product and the vehicle display device according to the above-described embodiment of the present invention are not limited to the above-described embodiment, and various modifications can be made within the scope described in the claims.

  In the above description, the resin molded product 1 has been described as being applied to the enclosure surface 106 and the standing surface 107 that constitute the facing plate 105 of the display device 100 for a vehicle. You may apply to parts other than a vehicle. The resin molded product 1 is an occupant including a driver who is exposed on the front side in the depth direction in the vehicle display device 100 such as a pointer 104, a pointer cap, an instrument panel, etc., which are molded by resin, as other parts of the vehicle. The present invention may be applied to other parts that can enter the field of view, or may be applied to a part where the surface gloss due to reflection of external light or the like is to be suppressed, for example, the inner wall surface of the casing of the head-up display. Moreover, the resin molded product 1 is a part other than the vehicle, for example, a part (for example, a frame shape that surrounds an end part of a display surface of a display) in a casing of a game machine, a portable terminal device, a home appliance, or the like. And the like.

  In the above description, the display unit 101 has been described as an analog instrument that displays various measurement values related to the vehicle in an analog manner using the pointer 104 that is a three-dimensional object. However, the display unit 101 is not limited thereto. A vehicle display device 100A according to the modification shown in FIG. 6 includes a display unit 101A instead of the display unit 101 (see FIG. 1). The display unit 101A displays various images on the image display surface as information about the vehicle, and is configured by a thin display. The display unit 101A includes a light source unit 102A that constitutes a so-called backlight, and displays various image information related to the vehicle using light emitted from the light source unit 102A. As the display unit 101A, for example, a TFT liquid crystal display can be used, but not limited thereto, a plasma display, an organic EL display, or the like can also be used. The display unit 101A includes, for example, an image corresponding to the above-described pointer 104, the indicator unit, a warning display symbol, etc., as information on the vehicle, information on eco-driving, etc., integrated travel distance, cooling water temperature, fuel remaining amount, You may display the driving | operation information regarding various driving | operations which change every moment at the time of driving | running | working of a vehicle, such as a battery electrical storage amount. The surrounding surface 106 of the facing plate 105 is provided so as to surround the image display surface of the display unit 101A.

  Then, the resin molded product 1 may be applied to the surrounding surface 106 and the standing surface 107 of the facing plate 105 in the vehicle display device 100A in which the display unit 101A as described above is incorporated. Thereby, the resin molded product 1 can suppress reflection of light and suppress gloss on the enclosure surface 106 and the standing surface 107 of the facing plate 105 in the vehicle display device 100A. In this case, the resin molded product 1 is a light source for a display that constitutes the display unit 101A that emits a relatively large amount of emitted light as compared with the light source unit 102 (see FIG. 1) of the analog instrument, particularly on the standing surface 107. Since the reflection of the light emitted from the part 102A can be suitably suppressed, the effect of suppressing the gloss can be more remarkably exhibited. For example, the image displayed on the display part 101A is reflected on the standing surface 107. Etc. can also be suppressed.

  In the above description, as a measuring instrument for measuring the surface roughness Sa and the skewness Ssk of the plurality of fine irregularities 2, the “3D measurement laser microscope LEXT OLS4000” manufactured by Olympus Corporation has been described as being used. In this case, a predetermined surface roughness measuring method and a skewness measuring method set in advance for measuring the surface roughness Sa and the skewness Ssk of the plurality of fine irregularities 2 may be used. It may be equivalent to the above.

DESCRIPTION OF SYMBOLS 1 Resin molding 2 Fine unevenness | corrugation 100, 100A Display apparatus 101 for vehicles, 101A Display part 102, 102A Light source part 103 Dial 104 Pointer 105 Look-back board 106 Enclosure surface 107 Standing surface 108 Visual position

Claims (2)

A display unit that is mounted on a vehicle and displays information about the vehicle;
The display unit is provided on a standing surface that is located between the light source unit and the viewing position of the display unit and projects along the alignment direction of the light source unit and the viewing position, and has a surface roughness of 1.0 μm to 10.0 μm. A plurality of fine irregularities satisfying that the skewness representing the symmetry of the surface height distribution is greater than 0 and 5.0 or less are molded on the surface, whereby the surface on which the plurality of fine irregularities are molded And a resin molded product having a surface with a gloss value of 2 or less at an incident angle of 85 ° ,
The surface roughness is the arithmetic average roughness Sa of the surface on which the fine irregularities are molded,
The skewness is a degree of deviation Ssk of the surface height distribution of the surface on which the fine irregularities are molded ,
Vehicle display device. In the plurality of fine irregularities, the surface roughness is 2.0 μm or more and 10.0 μm or less, and the skewness is 0.7 or more and 5.0 or less.
The vehicle display device according to claim 1.