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Disclosed is an optical system for utilizing the optical efficiency with the mechanism for two different standard types of optical disks.
English (United States)
This text was extracted from an ASCII text file.
100% of the total text.
Optical System for Multi-Functional Optical Disk Drive
an optical system for utilizing the optical
efficiency with the mechanism for two different standard types of
Fig. 1 shows
an example of this apparatus. The optical
(1) from the optical head (1) which contains a light source and
sensors goes to a half wave plate (13).
This half wave plate (13)
rotates the polarization angle 45º to
the prism (2). The beam,
out of half wave plate (13), goes to the prism (2). The prism (2)
divides the beam into two directions (3,4).
Because this prism is
made of a polarized beam splitter (14), a quarter wave plate (15) and
a reflector (16) as shown in Fig. 2, there are no wasted beams. Each
beam (3,4) goes to each objective lens (5,6) and is focused on each
disk (7,8). These disks (7,8) are
rotated by a single spindle motor
(9). This spindle motor (9) can attach
different types of hubs
(10,11) at each end of its spinning shaft in order to mount different
types of optical disks (7,8), such as hole hub type or magnetic hub
type. Objective lenses (5,6) are mounted
to the same moving part
(12) of the actuator which can focus and track the disk. These
lenses (5,6) can be utilized to different optical types of optical
disks, such as the difference in the thickness of the disk. By
rotating the half wave plate (13), the ratio of beams can be