JPH0337620U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an optical disk inspection device of the optical head rotation type, which is equipped with an optical head composed of a separation optical system in which a light beam according to the present invention passes through the rotation center of a rotation mechanism; FIG. 2 shows a conventional example. 1... Optical disk, 3... Rotating mechanism, 4... Optical head, 4A... Rotating part, 4B... Fixed part, 45
...Condensing lens, 61, 62...1/4 wavelength plate.

Claims (1)

[Claims for Utility Model Registration] An optical head supported by a rotating mechanism and using a separating optical system such that a light beam passes through the center of rotation of the rotating mechanism, and a condensing lens built into the optical head. In an optical disk inspection device with a rotating optical head that inspects the characteristics of an optical disk by displacing it in the tracking direction and the focusing direction, an exit on a fixed part side and a rotating part side of the optical head constituted by the separating optical system are provided. What is claimed is: 1. An optical disk inspection apparatus characterized in that a quarter-wave plate is provided at each entrance of the optical head, and the light beam sent from the fixed part side of the optical head to the fixed part side is circularly polarized light.