A method includes imaging, with an optical read head attached to a second mechanical component, a portion of an encoder track disposed on a first mechanical component. The encoder track has a first encoder scale extending along the encoder track and a second encoder scale extending along the encoder track, and the imaged portion of the encoder track includes a first portion of the first encoder scale and a second portion of the second encoder scale. The method further includes transforming an imaged portion of the encoder track to a spatial frequency domain; identifying a pair of frequency bins in the spatial frequency domain; determining a phase difference between a first frequency bin and a second frequency bin in the pair of frequency bins; and mapping the phase difference to a positional relationship between the first mechanical component and the second mechanical component.

A method includes imaging, with an optical read head attached to a second mechanical component, a portion of an encoder track disposed on a first mechanical component. The encoder track has a first encoder scale extending along the encoder track and a second encoder scale extending along the encoder track, and the imaged portion of the encoder track includes a first portion of the first encoder scale and a second portion of the second encoder scale. The method further includes transforming an imaged portion of the encoder track to a spatial frequency domain; identifying a pair of frequency bins in the spatial frequency domain; determining a phase difference between a first frequency bin and a second frequency bin in the pair of frequency bins; and mapping the phase difference to a positional relationship between the first mechanical component and the second mechanical component.

In a resin decorative part, a carbon decorative panel includes a clear decoration having a body transmitting light and including a carbon-toned irregular surface provided on the body and having a carbon-toned pattern formed with protrusions and depressions. The carbon-toned irregular surface has a plurality of unit patterns that constitute a weave of pseudo carbon fiber bundles presenting carbon fiber bundles in a pseudo manner, as the protrusions and depressions that form the carbon-toned pattern. The unit patterns each have a top portion positioned at the center in the extending direction of the pseudo carbon fiber bundle. A plurality of unit patterns include at least two kinds of unit patterns with different top portion inclinations, where the top portion inclination is the inclination of the long axis along the long side direction of the top portion relative to the reference line along the extending direction.

In a resin decorative part, a carbon decorative panel includes a clear decoration having a body transmitting light and including a carbon-toned irregular surface provided on the body and having a carbon-toned pattern formed with protrusions and depressions. The carbon-toned irregular surface has a plurality of unit patterns that constitute a weave of pseudo carbon fiber bundles presenting carbon fiber bundles in a pseudo manner, as the protrusions and depressions that form the carbon-toned pattern. The unit patterns each have a top portion positioned at the center in the extending direction of the pseudo carbon fiber bundle. A plurality of unit patterns include at least two kinds of unit patterns with different top portion inclinations, where the top portion inclination is the inclination of the long axis along the long side direction of the top portion relative to the reference line along the extending direction.

A clear decoration body includes a character display area and an indicator display area that light up and display a design pattern by transmitting light. A first partition layer is laminated on a carbon style irregular surface, shields light, and forms a first partition boundary of the character display area. A carbon colored layer is laminated on the carbon style irregular surface, shields light, and forms a first partition boundary of the indicator display area. The character display area of the clear decoration body is provided with a projecting flat part that at least projects relative to a bottom part of irregularities of a decoration surface toward a side opposite to a viewing side, and that is formed in a flat shape.

A clear decoration body includes a character display area and an indicator display area that light up and display a design pattern by transmitting light. A first partition layer is laminated on a carbon style irregular surface, shields light, and forms a first partition boundary of the character display area. A carbon colored layer is laminated on the carbon style irregular surface, shields light, and forms a first partition boundary of the indicator display area. The character display area of the clear decoration body is provided with a projecting flat part that at least projects relative to a bottom part of irregularities of a decoration surface toward a side opposite to a viewing side, and that is formed in a flat shape.

A display device for a vehicle includes: a display unit; a light guide plate disposed on a viewing side of the display unit and having translucency; and a light source unit that causes a light source light to enter inside of the light guide plate through an outer peripheral portion of the light guide plate. The light guide plate includes a reflecting portion having a plurality of reflecting elements to reflect the light source light from the light source unit to the viewing side. The reflecting element has a reflective curved surface formed in a curved surface shape to face the outer peripheral portion where the light source light is incident.

A display device for a vehicle includes: a display unit; a light guide plate disposed on a viewing side of the display unit and having translucency; and a light source unit that causes a light source light to enter inside of the light guide plate through an outer peripheral portion of the light guide plate. The light guide plate includes a reflecting portion having a plurality of reflecting elements to reflect the light source light from the light source unit to the viewing side. The reflecting element has a reflective curved surface formed in a curved surface shape to face the outer peripheral portion where the light source light is incident.

A diffuser and an Indication panel are provided. The diffuser includes: a plurality of light-transmitting regions; and a light-shielding region located between adjacent ones of the plurality of light-transmitting regions, and each of the light-transmitting regions corresponds to an icon symbol on the indication panel. The diffuser is employed to avoid a phenomenon of light leakage between adjacent icon symbols, thereby improving the display effect of the indication panel.

A gauge device is provided and includes an analog display to signify a measured valued, a motor and worm gear arrangement which is configured to retain a current state of the analog display when de-energized or to change the analog display when energized and a control system. The control system is configured to normally de-energize the motor and worm gear arrangement and to energize the motor and worm gear arrangement only in accordance with a calculated state of the analog display differing from the current state by at least a threshold level.