Vibration-Free Mechanical Shutter for Holographic Printers
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Solution Overview
Problem
Holographic printers are vulnerable to vibrations caused by the opening and closing of mechanical shutters, which degrade the quality of hologram recordings.
Innovation Solution
A holographic printer using a vibration-free mechanical shutter, where a rotation plate with slits is rotated by a servo motor to periodically expose object light to the hologram recording medium, eliminating vibrations associated with traditional shutter operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a mechanical shutter is used to control light exposure, then the exposure timing can be precisely controlled, but vibrations are generated during opening and closing which degrade hologram recording quality
Solution Approach 1:
The patent transforms the static opening/closing shutter mechanism into a dynamic rotating disk with multiple slits. The shutter is implemented as a rotation plate that rotates continuously at a controlled speed, with slits positioned at specific angles to control light exposure timing. This dynamic approach eliminates the vibration problems of traditional shutters while maintaining precise exposure control through rotational speed and slit position adjustment.
Solution Approach 2:
The patent employs periodic action by using a rotating disk with multiple slits that periodically expose light to the recording medium. The rotation plate completes full rotations, and during each rotation, slits at different positions provide periodic exposure opportunities. This periodic mechanism allows precise control of exposure timing while distributing the mechanical action over continuous rotation rather than abrupt opening/closing events.
2Device complexity
If a traditional mechanical shutter is used, then the structure is simple, but the exposure period cannot be made very short due to mechanical limitations
Solution Approach 1:
The patent divides the shutter function into multiple slits on a rotating disk. Instead of a single opening/closing mechanism, the shutter is segmented into multiple slits positioned at different angles around the rotation plate. Each slit provides a discrete exposure opportunity during rotation. This segmentation allows the exposure period to be controlled by both the number of slits and their angular positions, enabling very short effective exposure periods while maintaining a relatively simple overall structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution prevents degradation of hologram recording quality by eliminating vibrations and allows for a very short exposure period by adjusting the rotation speed and number of slits on the rotation plate.
Implementation Method 1
a rotation plate on which a slit is formed to expose the object light generated by the holographic fringe pattern; and a motor configured to rotate the rotation plate
Data Source
AI summary
A holographic printer using a vibration-free mechanical shutter is provided. A holographic printer, according to an embodiment of the present invention, comprises: a light source which emits light; a modulator which modulates the light emitted from the light source to generate a holographic fringe pattern in a hogel unit; a stage on which a holographic recording medium, on which a holographic fringe pattern generated by the modulator is to be recorded in a hogel unit, is placed; a driving part which moves a position of the stage in a hogel unit; and a shutter which periodically exposes, to the holographic recording medium, object light generated by the holographic fringe pattern generated by the modulator, wherein the shutter includes a rotating plate having a slit that exposes the object light by means of the holographic fringe pattern, and a motor rotating the rotating plate. Accordingly, by applying a mechanical shutter having a structure in which vibration does not occur to the holographic printer, it is possible to prevent degradation of hologram recording quality caused by vibration generated during opening/closing of the shutter.