Apparatus to control incident angle of reference beam and holographic information recording/reproducing apparatus having the apparatus

Abstract

An apparatus to control the incident angle of a reference beam, includes a first lens element to allow the reference beam to be incident on a holographic recording medium, and a driving portion to provide the reference beam to the first lens element and to move in a direction perpendicular to an optical axis to change the incident position of the reference beam on the first lens element in a radial direction of the first lens element, wherein the incident angle of the reference beam incident on the holographic recording medium is determined according to the incident position of the reference beam in a radial direction of the first lens element.

Description

Technical field [0001] Aspects of the present invention relate to an apparatus for controlling the angle of incidence of a reference beam and a holographic information recording / reproducing apparatus having the same, and more specifically, to an apparatus for easily controlling the angle of incidence of a reference beam, and A device for recording / reproducing holographic information with the device. Background technique [0002] The holographic technology records the interference pattern by using a signal beam containing a signal and a reference beam without the signal (the signal beam and the reference beam propagate at different angles from each other), thereby enabling the optical signal to be reproduced in its original form and making 3D images The signal in can be reproduced. Recently, optical storage technology that uses the operating principle of the above-mentioned holographic technology to record / reproduce digital signals has become prominent. Using the above-mentioned h...

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Problems solved by technology

However, in Figure 3A and Figure 3B In the prior art method shown, since the rotation and translation of the current mirror need to be controlled simultaneously, two driving parts need to be connected, and it is difficult to precisely control the rotation and translation

Therefore, it is difficult to precisely control the incident angle of the reference beam

In addition, according to the prior art method shown, it is difficult to construct a compact holographic storage optical system due to the required arrangement resulting in an increase in the size of the control structure of the incident angle of the reference beam.

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