Holographic Optical Path Adjuster for Servo Control
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Solution Overview
Problem
Current recording and reproducing technologies face limitations in storage capacity and require efficient servo methods for holography-based data storage, which is not adequately addressed by existing optical systems and methods.
Innovation Solution
A recording/reproducing apparatus with an optical system that includes an optical path adjuster, light reflecting unit, image sensor, and light receiving unit, utilizing a tiltable mirror surface and actuator to adjust the incident angle of light and generate monitoring signals for optimal data reproduction, along with a servo control system to manage focus, tracking, and rotation errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If holography technology is used to increase storage capacity by recording multiple holography information at one position, then storage capacity is remarkably increased, but a complex servo method and optical system are required to reproduce data from multiple pages
Solution Approach 1:
The patent divides the optical system into separate functional units: a first optical path adjuster for angle adjustment, a second optical path adjuster for position adjustment, and distinct light receiving units for different measurement purposes. This segmentation allows each component to handle specific tasks independently, reducing overall system complexity while enabling multi-page data reproduction.
Solution Approach 2:
The patent employs dynamically adjustable optical elements including tiltable mirror surfaces in the first optical path adjuster and variable focal length lenses in the second optical path adjuster. These dynamic components allow real-time adjustment of light paths to accommodate different holography information positions and angles, enabling flexible reproduction without requiring complex fixed mechanical structures.
2Quantity of substance
If the recording medium is rotated at predetermined angles and stopped multiple times to reproduce data from several tens or hundreds of pages, then data from multiple pages can be reproduced, but the reproduction process becomes time-consuming and complex
Solution Approach 1:
The patent pre-adjusts the optical paths using the first and second optical path adjusters before data reproduction begins. The tiltable mirror surfaces and variable focal length lenses are configured in advance to position light beams correctly for different holography information pages, eliminating the need for time-consuming rotation and stopping operations during reproduction.
Solution Approach 2:
The patent enables continuous data reproduction by maintaining stable optical paths through the adjustable optical elements. The light beams can be continuously directed to different holography information positions without interrupting the reproduction process, allowing sequential reading of multiple pages in a continuous manner rather than through repeated stopping and starting.
3Measurement precision
If a tiltable mirror surface and actuator are used to adjust incident angle for optimal data reproduction, then monitoring signals are maximized, but the device complexity increases
Solution Approach 1:
The patent incorporates light receiving units that detect optical signals and provide feedback to a controller. This feedback information is used to adjust the tiltable mirror surfaces and variable focal length lenses in real-time, ensuring optimal positioning for maximum monitoring signals. The feedback mechanism enables precise automation without requiring complex manual adjustment systems.
Solution Approach 2:
The optical path adjusters are designed to automatically optimize their own positioning through the feedback from light receiving units. The system self-adjusts the incident angles and focal lengths based on detected signal strength, eliminating the need for external intervention or complex pre-programming. The actuator and tiltable mirror surfaces work autonomously to achieve optimal data reproduction conditions.
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 efficient data reproduction from holographically stored data by maximizing monitoring signals and maintaining focus, tracking, and rotation error signals within predetermined ranges, enhancing storage density and capacity.
Implementation Method 1
a light reflecting unit which reflects the light transmitting through the recording medium to the predetermined position of the recording medium
Implementation Method 2
a light receiving unit receiving light, which is not transmitted through the recording medium and is diffracted from the recording medium
Data Source
AI summary
An apparatus for recording/reproducing data using holography technology and a method of reproducing data using the same are disclosed. The recording/reproducing apparatus includes an optical path adjuster which adjusts the path of light emitted from a light source and irradiates the light to a predetermined position of a recording medium, a light reflecting unit which reflects the light transmitting through the recording medium to the predetermined position of the recording medium, an image sensor which receives the reflected light and reproduces data included in the reflected light, and a light receiving unit receiving light, which is not transmitted through the recording medium and is diffracted from the recording medium, and generating a monitoring signal. Accordingly, it is possible to provide a simple optical system suitable for the recording/reproducing apparatus using the holography technology and an efficient method of reproducing data using the same.