Patent ID: 8065973

Claim:
An indicating instrument comprising: a panel including a base plate made of resin and having a surface, the surface having a line pattern with lines formed therein, the line pattern forming concentric circles, wherein the line pattern is defined by projections and grooves, each of the projections has a triangular cross-section in a cross-sectional plane defined perpendicular to an axis of one of the lines, wherein the triangular cross-section of each projection is defined by two inclined walls which extend along a respectively associated line in said line pattern, both said walls being inclined relative to a direction perpendicular to the surface of the base plate, the grooves are defined between adjacent projections, the projections being arranged with an interval in a range between 0.1 mm and 0.3 mm between adjacent projections and each of the projections having a dimension that is in a range between 10 μm and 20 μm in a direction perpendicular to the surface, the projections and grooves are formed such that the surface has a glossiness ratio Gp/Gv in a range between 1.5 and 2.2, Gp is a glossiness having a value equal to or lower than 40 measured in a direction parallel to an axis of at least one line, Gv is a glossiness having a value equal to or lower than 40 measured in a direction perpendicular to an axis of at least one line, and each of glossiness Gv and glossiness Gp is determined by reflectance of light when an angle of incidence and an angle of reflection relative to the surface are 60°, thereby forming the line pattern to provide a metallic appearance on the surface of the base plate, wherein the panel is provided with scales formed on the surface of the base plate to cover a part of the line pattern, and wherein the indicating instrument further comprises: a pointer for pointing to the scales, the pointer being disposed rotatable along the surface of the panel about a center of the concentric circles.