Holographic Reproducing Apparatus Multi-Angle Viewing
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Solution Overview
Problem
Holographic 3D display techniques based on photorefractive crystals require a unique viewing angle, limiting observers' ability to view recorded images from multiple orientations.
Innovation Solution
A holographic reproducing apparatus and method that uses a photorefractive crystal with holographic images recorded in multiple angles, and a light source providing reproducing light beams at different angles with the same frequency and optical length as the reference light beam, allowing observers to view images from various orientations without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single reference light beam is used for holographic recording, then the holographic image can be clearly recorded, but only one unique viewing angle is available for observation
Solution Approach 1:
The patent divides the single reference light beam into multiple reference light beams with different incident angles. Each reference light beam records a holographic image at a specific angle, enabling multi-angle viewing. This segmentation transforms the limitation of a single viewing angle into multiple viewing angles while maintaining system manageability.
Solution Approach 2:
The patent introduces the angular dimension as a new parameter for holographic recording. Instead of recording only at one angle, the system records holographic images at multiple angles by varying the incident angle of reference light beams. This adds the dimension of viewing angle versatility to the holographic system.
2Adaptability or versatility
If multiple reference light beams with different angles are used to enable multi-angle viewing, then viewing versatility improves, but the optical path control and system alignment become more complex
Solution Approach 1:
The patent introduces a beam splitting device as an intermediary component to generate multiple reference light beams from a single light source. This mediator simplifies the system by avoiding the need for multiple independent light sources while still achieving multi-angle holographic recording capability.
Solution Approach 2:
The patent employs adjustable optical elements that can dynamically change the incident angles of reference light beams. This dynamic adjustment capability allows the system to flexibly control the angular parameters of multiple reference light beams, simplifying optical path management compared to fixed-angle systems.
3Ease of operation
If holographic images are recorded at multiple angles, then observers can view from different orientations, but the requirement for maintaining precise optical paths for each angle increases system complexity
Solution Approach 1:
The patent designs the optical system such that all reference light beams originate from the same light source and follow symmetric optical paths. This equipotential design ensures that all optical paths have equal importance and can be controlled with the same precision level, reducing the overall precision requirement compared to asymmetric multi-path systems.
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
Enables multiple observers to view holographic images recorded in photorefractive crystals from different angles simultaneously or sequentially, addressing the limitation of unique viewing angles in traditional holographic reproduction.
Implementation Method 1
The effect in which the refractivity of the material is changed by the light is referred to as the photorefractive effect in short. However, the photorefractive effect particularly refers to the effect in which a charge field is formed by the photoelectric effect when the optical material is radiated by the light beam and then the refractivity of the optical material varies with the distribution of the light intensity in space due to the photoelectric effect
Implementation Method 2
when the information is recorded in holography, the coherent reference light beam and object light beam are incident to the photorefractive crystal in different angles, and interference fringes are generated at the portions where the reference light beam and the object light beam intersect
Implementation Method 3
when the recordable medium is radiated by the reproducing light wave, the original object light wave is reproduced according to the diffraction principle
Data Source
AI summary
The present disclosure relates to a holographic reproducing apparatus comprising: a light source configured to supply a reproducing light beam to be incident to a photorefractive crystal, wherein the photorefractive crystal has holographic images recorded therein in a plurality of different angles respectively; a reflective mirror configured to reflect the reproducing light beam emitted from the light source to the photorefractive crystal; and a driving mechanism connected to the reflective mirror and configured to drive the reflective mirror to move on a plane elliptical arc, the plane elliptical arc is defined by using the light source and the photorefractive crystal as two mathematical focuses and using a predetermined constant, so that an incident angle of the reproducing light beam to be incident to the photorefractive crystal varies to form a plurality of reproducing light beams in different angles to be incident to the photorefractive crystal in sequence.