JPS6390204U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a partial perspective view of an example of a beam splitter according to the present invention, FIGS. 2 and 3 are diagrams for explaining the operation of the example shown in FIG. 1, and FIG. 5 and 6 are views for explaining the operation of the example shown in FIG. 4, and FIG. 7 is a partial perspective view of another example of the beam splitter according to the present invention. FIG. 8 is a schematic side view showing still another example, and FIG. 8 is a schematic configuration diagram showing an example of an optical pickup device. In the figure, 21 is a plate-shaped substrate, 22 is a striped convex portion, 23 is a striped concave portion, 24 is a polarizing film, 31 and 42 are light transmitting portions, and 41 is a substrate.

Claims (1)

[Scope of utility model registration request] A polarizing film, in which a large number of striped recesses and projections are formed on the surface of a light-transmitting substrate, and covers the stripe-shaped recesses and projections with a substantially uniform thickness on the surface of the substrate; Each of the striped convex portions on which a semitransparent film is disposed and covered with the polarizing film or semitransparent film, and the interior of the striped concave portions adjacent to the convex portions with the polarizing film or semitransparent film sandwiched therebetween. A beam splitter in which the refractive index and the refractive index are the same or the difference in the refractive index is small.