Decorative part for vehicle display device and vehicle display device

1. A decorative part for a vehicle display device, comprising:

a substrate body that is molded by black synthetic resin; and

a mirror surface that is formed on a surface of the substrate body, wherein

the mirror surface is formed so that mirror surface roughness becomes larger than 0 and equal to or smaller than 0.35 μm and a ratio of a wavelength becomes equal to or larger than 1:600 and equal to or smaller than 1:6000 in the case of an amplitude of 1, the amplitude being captured by a ratio of the amplitude corresponding to an average height of an undulation waveform and the wavelength corresponding to an average length of the undulation waveform in an undulation curve in which a cutoff value from a surface shape is 250 μm.

2. The decorative part for the vehicle display device according to claim 1 , further comprising:

a ridge line that is formed by an intersection of different surfaces of the surface of the substrate body, wherein

the ridge line is formed so that a curvature radius of a corner forming a vertex becomes larger than 0 and equal to or smaller than 28.0 μm.

3. A decorative part for a vehicle display device, comprising:

a substrate body that is molded by black synthetic resin;

a mirror surface that is formed on a surface of the substrate body; and

a plurality of grooves that are formed on the surface of the substrate body, wherein

the mirror surface is formed so that mirror surface roughness becomes larger than 0 and equal to or smaller than 0.35 μm and a ratio of a wavelength becomes equal to or larger than 1:600 and equal to or smaller than 1:6000 in the case of an amplitude of 1, the amplitude being captured by a ratio of the amplitude corresponding to an average height of an undulation waveform and the wavelength corresponding to an average length of the undulation waveform in an undulation curve in which a cutoff value from a surface shape is 250 μm, and

the plurality of grooves are formed so that a width between bottom points of the adjacent grooves becomes larger than 0 and equal to or smaller than 3.0 μm and a height of a vertex between the adjacent grooves at a lower side of the bottom points of the adjacent grooves becomes larger than 0 and equal to or smaller than 1.0 μm.

4. The decorative part for the vehicle display device according to claim 3 , further comprising:

a ridge line that is formed by an intersection of different surfaces of the surface of the substrate body, wherein

the ridge line is formed so that a curvature radius of a corner forming a vertex becomes larger than 0 and equal to or smaller than 28.0 μm.

5. The decorative part for the vehicle display device according to claim 3 , wherein

the plurality of grooves are formed so that a curvature radius of a corner forming the vertex between the adjacent grooves becomes larger than 0 and equal to or smaller than 38.0 μm.

6. A vehicle display device comprising:

a display unit that displays information on a vehicle; and

a decorative part for the vehicle display device that includes a substrate body molded by black synthetic resin and a mirror surface formed on a surface of the substrate body, wherein

the mirror surface is formed so that mirror surface roughness becomes larger than 0 and equal to or smaller than 0.35 μm and a ratio of a wavelength becomes equal to or larger than 1:600 and equal to or smaller than 1:6000 in the case of an amplitude of 1, the amplitude being captured by a ratio of the amplitude corresponding to an average height of an undulation waveform and the wavelength corresponding to an average length of the undulation waveform in an undulation curve in which a cutoff value from a surface shape is 250 μm.