Single Laser Diffractive Elements for Multi-Angle Pseudo-Holographic Images
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Solution Overview
Problem
Current methods for creating multiple images on a single image plane, such as lenticular and holographic techniques, face challenges including slow exposure times, alignment difficulties, and the need for complex multi-laser hardware, limiting their efficiency and versatility in optical storage devices.
Innovation Solution
The use of a single laser beam and diffractive elements to create multiple diffraction patterns on photosensitive substrates, allowing for the formation of pseudo-holographic images viewable at distinct angles, with the first order diffraction intensity determining the image location based on wavelength and diffraction element spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If lenticular techniques are used to create multiple images on the same plane, then image discrimination is achieved, but the device complexity increases due to the need for a secondary sheet of lenses
Solution Approach 1:
The patent extracts the essential function of image discrimination from the complex lenticular lens system and implements it through a simpler diffractive optical element that directly modulates light from a single source to create multiple virtual images without requiring secondary lens sheets
Solution Approach 2:
The patent replaces the mechanical lenticular lens system with a diffractive optical system that uses light interference and diffraction patterns to achieve the same image discrimination effect, eliminating the need for physical lens arrays
2Manufacturing precision
If holographic techniques with reference beams are used to record multiple images, then complete wave field recording is achieved, but the exposure time increases significantly
Solution Approach 1:
The patent pre-calculates and programs the diffractive optical element patterns before exposure, allowing the system to rapidly switch between different virtual image configurations without requiring time-consuming real-time alignment of reference beams during the exposure process
Solution Approach 2:
The patent uses periodic modulation of the light source through the diffractive element to sequentially create different virtual images, enabling multiple images to be recorded in a single exposure cycle rather than requiring separate exposures for each image
3Manufacturing precision
If phase interference diffraction gratings are created using multiple lasers, then holographic images are formed, but the hardware complexity and cost increase
Solution Approach 1:
The patent merges the functions of multiple lasers into a single light source by using a diffractive optical element to split and direct light from one laser into multiple paths that create the same interference patterns previously requiring multiple independent laser systems
Solution Approach 2:
The patent makes a single light source perform multiple functions by using the diffractive optical element to create different virtual images at different angles and configurations from one source, replacing the need for multiple specialized laser systems
4Adaptability or versatility
If holographic techniques are used to separate images at different angles, then multiple images are created on the same plane, but alignment accuracy and environmental control requirements increase
Solution Approach 1:
The patent designs the diffractive optical element with built-in reference patterns and alignment features that automatically self-align during the imaging process, eliminating the need for manual alignment procedures and reducing sensitivity to environmental disturbances
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
This approach enables the creation of efficient, versatile pseudo-holographic images on optical storage devices, allowing for increased data density and faster image recording without the need for complex hardware, while maintaining image quality and accuracy.
Implementation Method 1
The use of a single laser beam and diffractive elements to create multiple diffraction patterns on photosensitive substrates, allowing for the formation of pseudo-holographic images viewable at distinct angles
Implementation Method 2
exposing a photosensitive substance to form a plurality of diffractive elements; and, forming a pseudo-holographic, diffraction image comprising said diffractive elements
Data Source
AI summary
Methods create images viewable under different selected angles on optical storage devices and other photosensitive surfaces and optical storage devices with super-imposed images. Generally, a photosensitive surface is exposed with multiple diffraction patterns creating super-imposed images. These diffraction patterns create super-imposed images on the photosensitive surfaces, which can be read by either a human or a computer.