Head-Mounted Display Optical Scan Section with Angled Laser Emission
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Solution Overview
Problem
Existing image display apparatuses face challenges in displaying high-quality images due to the lack of optical elements that change the cross-sectional shape of the beam and require complex three-dimensional alignment, making them difficult to assemble and maintain.
Innovation Solution
An image display apparatus with a light combining section, an optical element such as a prism that inclines and changes the cross-sectional shape of the combined light, and an optical scan section with a movable light reflection surface, allowing for two-dimensional scanning without the need for additional optical components, enabling easier assembly and improved image display characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flat mirror is provided between the beam supplying section and the beam deflecting section to reflect light in the thickness direction, then the beam can be directed to the reflection mirror, but the apparatus requires complicated three-dimensional alignment of components, making assembly difficult
Solution Approach 1:
The patent removes the flat mirror from the optical path and extracts the beam direction control function directly into the beam supplying section by adjusting the emission angle of semiconductor lasers in the thickness direction, thereby eliminating the need for separate reflection components and simplifying alignment
Solution Approach 2:
Instead of using a flat mirror to redirect light after it leaves the beam supplying section, the invention inverts the approach by directing the light source itself to emit at specific angles, making the beam supplying section both the light source and the direction control element
2Device complexity
If no optical element that changes the cross-sectional shape of the beam is provided, then the apparatus structure is simpler, but it is difficult to display a high-quality image
Solution Approach 1:
The patent makes the beam supplying section serve multiple functions: it not only generates light but also controls the cross-sectional shape of the beam through angled emission of semiconductor lasers, eliminating the need for separate beam-shaping optical elements while maintaining image quality
Solution Approach 2:
The invention changes the emission parameters of the semiconductor lasers by adjusting their emission angles in the thickness direction, thereby controlling the cross-sectional shape of the combined light beam without requiring additional optical elements
3Ease of operation
If the beam is deflected in the thickness direction of the enclosure before incident on the reflection mirror, then the optical path is controlled, but complicated three-dimensional alignment is required, preventing ready assembly
Solution Approach 1:
The patent extracts the beam direction control function from the beam deflecting section and relocates it to the beam supplying section, allowing the beam to be directed at appropriate angles from the source itself without requiring complex alignment of separate deflection components
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 allows for the reduction in size and complexity of the apparatus, improved image display quality, and simplified assembly by using a prism to change the light's cross-sectional shape and an optical scan section with a movable light reflection surface, enhancing the display characteristics and assembly process.
Implementation Method 1
an optical element that inclines an optical axis of the combined light from a light combining section and changes a cross-sectional shape of the combined light from the light combining section
Implementation Method 2
an optical scan section that deflects light exiting out of the optical element for two-dimensional scanning, an optical axis of the light flux emitted from each of the plurality of light source sections and directed through the light combining section and the optical element toward the optical scan section is present in a first plane, the optical scan section has a light reflection surface that is configured to be perpendicular to the first plane when the optical scan section is not driven and swings around a first axis present in the first plane and a second axis parallel to the direction of a normal to the first plane
Data Source
AI summary
An image display apparatus including a plurality of light source sections, a light combining section that combines light fluxes,an optical element that inclines an optical axis, and an optical scan section that deflects light for scanning, wherein an optical axis of the light flux from each of the plurality of light source sections to the optical scan section is present in a first plane, the optical scan section has a light reflection surface that is perpendicular to the first plane and swings around a first axis present in the first plane and a second axis parallel to the direction of a normal to the first plane, and an angle of radiation of the light flux in the direction of the normal to the first plane is greater than that of the light flux in an in-plane direction in the first plane.