Hologram Disc Apparatus Same-Side Optical Path Design
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Solution Overview
Problem
Conventional hologram disc reading and writing apparatuses require a large volume due to the separation of light sources and optical reading heads, limiting their application in portable electronic devices with small form factors.
Innovation Solution
The apparatus is redesigned to place the optical reading head and light sources on the same side of the hologram disc using a phase conjugate light readout and spherical wave shifting multiplexing, incorporating a signal light source module, beam splitter, reference/reading light source, and reflector to reduce volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical reading head and light sources are placed on opposite sides of the hologram disc, then the reading and writing operations can be performed, but the volume of the apparatus becomes large
Solution Approach 1:
The patent merges the optical reading head and light sources onto the same side of the hologram disc by using a beam splitter to combine the optical paths. The beam splitter allows the signal light from the light source and the data light from the reading head to coexist in the same optical path, enabling both components to be positioned on one side of the disc while maintaining full reading and writing functionality.
2Volume of stationary object
If the beam splitter is positioned to allow both signal light and data light transmission, then the apparatus volume is reduced, but the optical path becomes more complex
Solution Approach 1:
The beam splitter serves as an intermediary optical component that mediates between the signal light path and the data light path. It selectively transmits and reflects light based on polarization or angle, allowing both optical paths to intersect without interference. This intermediary component enables the compact same-side configuration while managing the optical path complexity through its beam splitting and combining functionality.
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 configuration effectively reduces the volume of the hologram disc reading and writing apparatus, enabling its application in portable electronic products with small sizes while maintaining high storage capacity and reading speeds.
Implementation Method 1
The signal light beam has a first polarization direction
Implementation Method 2
the beam splitter is adapted for transmitting the signal light beam to the data region
Implementation Method 3
The reflector is adapted for reflecting the spherical wave light beam to form a phase conjugate light beam conjugating with the spherical wave light beam
Implementation Method 4
The spatial light modulator is disposed on the transmission path of the signal light beam for modulating the signal light beam
Implementation Method 5
the data light beam is focused on the CCD 150 after passing through the focusing lens 140
Implementation Method 6
the CCD 150 transforms the data light beam 134 into an electric signal
Implementation Method 7
the signal light beam 112 and the spherical wave light beam 132 are interfered mutually in the data region 52, such that the data are recorded in the data region 52 in the form of interference gratings
Data Source
AI summary
A hologram disc reading and writing apparatus including a signal light source module, a beam splitter, a reference/reading light source, a reflector, and an optical reading head and a hologram disc reading apparatus are provided. A signal light beam emitted from the signal light source module is transmitted to a data region of a hologram disc through the beam splitter. The reference/reading light source, the signal light source module, and the optical reading head are disposed at the same side of the hologram disc. The reflector is disposed at the other side. A spherical wave light beam emitted from the reference/reading light source is transmitted through the data region and reflected by the reflector to form a phase conjugate light beam transmitted to and through the data region. The phase conjugate light beam is transformed to a data light beam transmitted to the optical reading head through the beam splitter.