Optical pickup
A technology of optical read-write head and optical system, which is applied in the direction of optical recording head, optical recording/reproduction, beam source, etc., and can solve problems such as manufacturing difficulties
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no. 1 example
[0022] refer to figure 2 , an information recording / reproducing apparatus capable of recording information data on DVD (Digital Versatile Disc) and Blu-ray disc and reproducing information data from DVD (Digital Versatile Disc) and Blu-ray disc will be described.
[0023] exist figure 2 Among them, when the optical disc 2 on which information data is recorded or reproduced from is a DVD, the controller 1 supplies a recording start signal or a reading start signal to the light source driver 4 . On the other hand, when the optical disc 2 is a Blu-ray disc, the controller 1 supplies a recording start signal or a reading start signal to another light source driver 3 .
[0024]When the light source driver 3 receives the recording start signal, the light source driver 3 supplies the driving voltage (or driving current) for recording information on the Blu-ray disc to the first light source 51 mounted on the optical head 5 . When the light source driver 3 receives the read start si...
no. 2 example
[0039] In the embodiments described above, the collimating lens 54 is a single lens. However, the collimating lens may also include a plurality of lenses.
[0040] Figure 4 An information recording / reproducing apparatus having an optical head according to another embodiment of the present invention in consideration of this point is shown.
[0041] In addition to the collimating lens 64, Figure 4 The information recording / reproducing device shown is the same as figure 2 Same as shown.
[0042] Figure 4 The illustrated collimating lens 64 includes a cemented lens of a convex lens L2 and a meniscus lens L3, and a plano-concave lens L1. The actuator 70 moves the entire collimator lens 64 in the optical axis direction in the same manner as the actuator 70 moves the collimator lens 54 as described above. It should be noted that the actuator 70 may be designed to move only the plano-concave lens L1 of the collimator lens 64 in the optical axis direction, or only the cemented...
no. 3 example
[0044] Such as Figure 5 As shown, the present invention may be modified so that the plano-concave lens L1 is separated from the collimator lens 64 and placed on the optical axis between the first light source 51 and the beam splitter 53 . according to Figure 5 In the shown structure, the reflected light of the light beam emitted by the second light source 52 (from the optical disc 2 ) is directed to the optical detector 60 only through the convex lens L2 and the meniscus lens L3 of the collimator lens 64 . The actuator 70 moves the cemented lens including the convex lens L2 and the meniscus lens L3 in the optical axis direction in the same manner as it moves the collimator lens 54 as described above.
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