Optical pickup device
A technology for optical pickups and optical discs, applied to optical recording heads, instruments, recording/reproducing with optical methods, etc., can solve problems such as reflectivity fluctuations, and achieve high-speed reproduction
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no. 1 example 〕
[0040] figure 1 is a schematic configuration of a horizontal arrangement type optical pickup using two optical transceiver-integrated elements 1a and 1b according to the first embodiment of the present invention. A laser beam emitted from each of the optical transceiver-integrated elements 1a and 1b (in which a light-emitting element and a light-receiving element are integrated) and having an optical axis 100 substantially horizontal (parallel to the z-axis) is transmitted by a beam splitter 12 or reflection. The transmitted or reflected laser beam is collimated by the collimator lens 13 into a parallel beam, and then reflected by the lift mirror 14 at a substantially right angle to the upper end portion where the objective lens 15 is placed. The reflected laser beam passes through the objective lens 15 and converges on the recording surface of the optical disc 16 which is placed substantially horizontally.
[0041] The condensed laser beam is reflected on the recording sur...
no. 2 example
[0047] Fig. 4 is a schematic configuration diagram of a horizontal arrangement type optical pickup using two optical transceiver-integrated elements 1a and 1b according to a second embodiment of the present invention. The optical pickup includes a light guide member 18 for guiding a part of the laser light beams emitted from the optical transceiver-integrated units 1 a and 1 b into the front monitor light receiving unit 17 .
[0048] The light guide member 18 is placed in contact with the light receiving surface of the light receiving portion 51 of the front monitor light receiving member 17, and protrudes downward. As shown in FIG. 5, the light guide element 18 includes: an optical fiber 33, which receives a part of the laser beam emitted from the optical transceiver integrated type elements 1a and 1b from the lower side, and bends the received laser beam to guide the front monitoring light. The light-receiving surface of the light-receiving portion 51 of the receiving elemen...
no. 3 example
[0051] 6 is a schematic configuration diagram of a horizontal arrangement type optical pickup using two optical transceiver-integrated elements 1a and 1b according to a third embodiment of the present invention. The optical pickup includes a light guide member 18 for guiding a part of the laser light beams emitted from the optical transceiver-integrated elements 1 a and 1 b to the front monitor light receiving element 17 .
[0052] The light guide element 18 is a triangular prism 20 whose cross-sectional shape is a right triangle (the apex angle is a right angle, and the base angle is 45 degrees). The prism 20 includes a slope 21 facing the right angle and two side surfaces 22 and 22 sandwiching the right angle. Then, one of the side surfaces 22 and 22 is in contact with the light receiving surface of the front monitor light receiving element 17; and the other of the side surfaces 22 and 22 is an incident surface of the laser beam. Other constituent elements in this optical p...
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