transverse pressure angle at a point y

transverse pressure angle at a point y

normal pressure angle at point y

angle of incidence of the line of sight

angle of incidence of the line of sight

angle of incidence of wanted signal

Furthermore, the light is introduced into the ear at an irradiation angle which deviates from a vertical lateral direction of irradiation.

Incidence angles of more than 25°

Incidence angles of more than 25°

c. Incidence angle' more than 25°

The specular reflector has a first average reflectance Ro in the visible at zero incident angle and a second average reflectance R60 in the visible at 60 degree incident angle.

According to the invention, the second incidence angle is equivalent to the first incidence angle at substantially all points on the plate.

A second camera (42b, 52b, 92b) simultaneously acquires an image of the structured light pattern on the circuit board (18) from a third angle of incidence, the third angle of incidence differing from the second angle of incidence.

Sensitivity to a light incidence angle of the first photoelectric converters is equal to sensitivity to a light incidence angle of the second photoelectric converters in each pixel.

c. Incidence angle' equal to or less than 25°; or