US 7,321,533 B2 | ||
Optical pickup device having a wavelength selecting film and an optical reflector | ||
Hiroshi Katayama, Higashi-Hiroshima (Japan); and Shinichi Tokuno, Higashi-Hiroshima (Japan) | ||
Assigned to Sharp Kabushiki Kaisha, Osaka (Japan) | ||
Filed on Mar. 19, 2003, as Appl. No. 10/391,185. | ||
Claims priority of application No. P2002-078806 (JP), filed on Mar. 20, 2002; and application No. P2002-266567 (JP), filed on Sep. 12, 2002. | ||
Prior Publication US 2003/0218952 A1, Nov. 27, 2003 | ||
Int. Cl. G11B 7/125 (2006.01) |
U.S. Cl. 369—53.26 [369/112.21] | 17 Claims |
1. An optical pickup device comprising:
a first light source that emits a first laser beam of a wavelength;
a second light source that emits a second laser beam having a wavelength different from the wavelength of the first laser
beam;
an object lens configured to concentrate the first and second laser beams on a data recording surface of an optical disk;
an optical monitor configured to detect a quantity of light of the second laser beam; and
an optical separator having,
a wavelength selecting film configured to reflect the first laser beam emitted from the first light source toward the object
lens, and to transmit the second laser beam emitted from the second light source to the object lens, and
a reflector configured to reflect a part of the second laser beam emitted from the second light source toward the optical
monitor;
the optical separator having a first prism located on a side proximate to the first light source and a second prism located
on a side proximate to the second light source, wherein
at least a part of one side surface of the first prism is bonded to at least a part of one side surface of the second prism
with the wavelength selecting film placed between the bonded part of the one side surface of the first prism and the bonded
part of the one side surface of the second prism; and
said one side surface of the second prism comprises an exposed non-contact surface which extends from the bonded part thereof
and which does not contact with said one side surface of the first prism, said non-contact surface of the second prism comprising
the reflector.
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