JPS6169111U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the mechanism section of the present invention, Fig. 2 is a left side view of Fig. 1, and Fig. 3 is a block diagram showing an embodiment of the lighting control section and calculation section of the present invention. It is. 10: first plate, 40: second plate, 20:
Light source, 30: Light receiving section, 60: Arithmetic section, 50: Lighting control section.

Claims (1)

[Scope of utility model registration request] A first plate having a polymerized portion and a non-polymerized portion formed by polymerizing two polarizing plates with their transmission axes shifted by 45 degrees; a second polarizer having first and second polarizing plates;
is integrally combined with either the first or second plate and is disposed opposite to either the first or second polarizing plate or the non-polymerized member facing thereto. a third light source disposed opposite the first and second light sources and the overlapping portion;
a lighting control section that sends out a periodic lighting signal with a 90 degree phase to the light source and sends out a constant lighting signal to the third light source, and is integrally coupled with the first to third light sources; first to third light receiving sections disposed to face each of the light sources with the first and second plates in between;
a modulating section that modulates the output of the third light receiving section with a periodic signal with a 90-degree phase; Consisting of a calculation section that forms an output corresponding to the relative rotational displacement of the body, and a light amount correction section that corrects the lighting signal of the lighting control section according to the deviation between the output of the third light receiving section and the set value. photoelectric displacement detector.