Holographic Stereogram Diffusing Member for Vertical Field of View
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Solution Overview
Problem
Holographic stereograms with parallax information only in the horizontal direction have a limited field of view in the vertical direction, and existing solutions that use a one-dimensional diffusing plate in front of the hologram recording medium struggle to suppress noise generation effectively.
Innovation Solution
A holographic-stereogram-forming apparatus that employs a diffusing member utilizing the principle of optical diffraction to diffuse the object beam more widely in the vertical direction than in the horizontal direction, eliminating the need for a diffusing plate in front of the hologram recording medium and thereby widening the field of view while suppressing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a one-dimensional diffusing plate is placed in front of the hologram recording medium to widen the field of view in the vertical direction, then the field of view is improved, but noise generation increases
Solution Approach 1:
The patent transitions from a one-dimensional diffusing plate to a two-dimensional array of optical elements (lenses or prism elements) arranged in both horizontal and vertical directions. This dimensional change allows for controlled diffusion in the vertical direction to expand the field of view while the horizontal arrangement maintains proper beam condensation, thereby preventing noise generation.
Solution Approach 2:
The optical elements are arranged with different spacing and orientations in different regions: in the vertical direction, elements are positioned to diffuse light and expand the field of view, while in the horizontal direction, elements are positioned to maintain proper condensation and avoid noise. This local differentiation of optical properties resolves the contradiction between field of view expansion and noise suppression.
2Area of stationary object
If the object beam is diffused widely in the vertical direction to widen the field of view, then the field of view is improved, but the recording precision of holographic elements deteriorates
Solution Approach 1:
By introducing a two-dimensional array of optical elements instead of simple vertical diffusion, the patent achieves vertical field of view expansion while maintaining horizontal condensation precision. The horizontal row of optical elements ensures that beam condensation remains precise in the direction critical for holographic element recording, thus preventing deterioration of recording precision.
Solution Approach 2:
The optical system is segmented into multiple discrete optical elements arranged in a grid pattern. Each element processes the light beam locally, with vertical elements providing diffusion for field of view expansion and horizontal elements maintaining condensation for precision. This segmentation allows independent optimization of diffusion and precision requirements in different directions.
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 effectively widens the field of view in the vertical direction without generating noise, allowing for a more immersive three-dimensional image experience by diffusing the object beam using a diffusing member with optical elements of varying thicknesses, arranged in a matrix, which enhances the recording of holographic elements.
Implementation Method 1
a diffusing unit provided on a light-emission side of the display and including a plurality of optical elements having different thicknesses in a direction of light transmission, the optical elements being arranged side by side in the horizontal direction and in a vertical direction in a matrix, the diffusing unit diffusing the object beam more widely in the vertical direction than in the horizontal direction
Data Source
AI summary
A holographic-stereogram-forming apparatus includes a laser beam source that generates a laser beam to be split into an object beam and a reference beam; a display that displays an original image corresponding to a substantially strip-shaped holographic element constituting a holographic stereogram containing parallax information in a horizontal direction; a diffusing unit provided on a light-emission side of the display and including optical elements having different thicknesses in a direction of light transmission, the optical elements being arranged in a matrix and each having a substantially rectangular shape with a vertical length being shorter than a horizontal length, the diffusing unit diffusing object beam more widely in the vertical direction than in the horizontal direction, the object beam to be diffused by the diffusing unit being generated by the display; and a condensing unit that condenses the object beam diffused by the diffusing unit on a hologram recording medium.