Optical reading device and focusing device capable of correcting image error

Abstract

An OPU capable of modifying aberration includes a light source, a lens, a liquid crystal layer and an electrode set, in which, the light source provides light rays and focuses them to a storage medium to read data by the lens, the liquid crystal layer is set between the light source and the medium, two electrodes of the electrode set are set at either side of the layer to alter the field of which by applying voltage to the electrode set to further alter the refraction coefficient to the light rays so as to modify the aberration of the OPU.

Description

technical field [0001] The present invention relates to an optical reading device capable of correcting aberrations, in particular to an optical reading device capable of correcting aberrations through a liquid crystal layer. Background technique [0002] Lenses are often used in optical systems to gather, refract or transmit light. Under ideal conditions, the lenses used in the optical system should be able to obtain ideal images according to the system design. However, in actual production, limited by material or process factors, the manufactured optical lenses cannot reach a completely ideal state. There is aberration phenomenon. In the process of use, the optical system is often deviated due to some unexpected operational factors (for example, when the optical drive is reading the optical disc, the optical disc is not completely placed properly, so that the data surface of the optical disc has an inclination angle). , affecting display quality or reading of data. [0...

AI Technical Summary

Problems solved by technology

However, the optical pickup head 40 changes the indium tin oxide electrodes ITO applied to both sides of the liquid crystal layer 46 1 and ITO 2 The voltage cannot effectively improve the aberration, and it cannot be flexibly adjusted for different degrees of aberration in the reading process

[0010] In the prior art, an additional controller (such as a tilt corrector 26 and an actuator 38) is generally provided in the optical system to adjust the lens angle, or by changing the voltage applied to the indium tin oxide electrodes on both sides of the liquid crystal layer To reduce the coma aberration of the optical system, it is easy to increase the production cost and control complexity, and cannot effectively improve the aberration or flexibly adjust for different degrees of aberration in the reading process

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