Apparatus and method for aligning holographic ROM system
AssigneeDaewoo Electronics Co., Ltd.
InventorKun Yul Kim
Life of this patent
Estimating the term…
Abstract
Before recording data included in a data mask on a holographic medium, the data mask and the holographic medium are aligned by an aligner, which includes a beam supplying unit for supplying an incident laser beam; a transferring unit for receiving the incident laser beam and producing a focused laser beam; a reflecting unit including the holographic medium for receiving the focused laser beam through a pinhole and then reflecting the received laser beam back to the pinhole, wherein the reflected laser beam passing through the pinhole returns to the transferring unit and then is converted into a return laser beam by the transferring unit; and a detecting unit for checking the amount of the return laser beam to determine whether the pinhole and the holographic medium are aligned or not.
Claims9
A holographic apparatus comprising:
- a beam supplying unit for supplying an incident laser beam;
- a transferring unit for receiving the incident laser beam and producing a focused laser beam;
- a reflecting unit including a holographic medium for receiving the focused laser beam through an opening and then reflecting the received laser beam back to the opening, wherein the amount of the reflected laser beam passing through the opening varies depending on whether or not the holographic medium is aligned with the opening, and wherein the reflected laser beam passing through the opening returns to the transferring unit and then is converted into a return laser beam by the transferring unit;
- and
- a detecting unit for checking the amount of the return laser beam to determine whether the opening and the holographic medium are aligned or not.
A holographic apparatus comprising:
- a beam supplying unit for supplying an incident laser beam;
- a lens for focusing the incident laser beam at an opening to thereby produce a focused laser beam;
- a data mask, which is used for recording data therein on a holographic medium and has the opening at a central portion thereof, for transmitting the focused laser beam through the opening;
- and
- a reflection mirror, coupled with the holographic medium, for reflecting the focused laser beam transmitted by the data mask,
- wherein the reflected laser beam passing through the opening is provided to a detecting unit for checking the amount of the reflected laser beam passing through the opening to determine whether the data mask and the holographic medium are aligned or not.
A holographic method comprising the steps of:
- (a) providing an incident laser beam;
- (b) transmitting the incident laser beam through a opening which is located at a central portion of a data mask which is used for recording data therein on a holographic medium;
- (c) reflecting the transmitted incident laser beam by a reflection mirror which is coupled with the holographic medium;
- (d) transmitting the reflected laser beam through the opening;
- and
- (e) detecting the amount of the reflected laser beam passing through the opening to determine whether the data mask and the holographic medium are aligned or not.
Dependencies are inferred from the claim text.