Nose-Side Scanning Optical System for Head-Mounted Display Weight
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Solution Overview
Problem
Conventional head-mounted displays experience increased weight and limited design flexibility due to the placement of virtual image formation devices, which affects the center of gravity and external design when positioned closer to the ear or front of the wearer's eye.
Innovation Solution
A virtual image display device with a scanning optical system located closer to the nose side than the eye and a virtual-image forming member positioned in front of the eye, preventing excessive projection to the side and front, and incorporating a semitransparent reflection film or diffraction grating for a see-through configuration, along with a nose pad and eye-width adjusting sections for improved fit and design freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the virtual image forming device is arranged closer to the ear side or front side of the wearer, then the device can be positioned away from the eye, but the center of gravity deviates from the wearer and the feeling of weight increases
Solution Approach 1:
The patent positions the scanning optical system in a novel spatial configuration - closer to the nose side than the eye and with the virtual image forming member arranged on the far side of the scanning optical system. This repositioning in multiple dimensions (both laterally and depth-wise) redistributes the weight distribution to maintain center of gravity near the wearer's face, reducing the feeling of weight while maintaining functionality
2Adaptability or versatility
If the virtual image forming device is arranged closer to the ear side or front side of the wearer, then the device can be positioned away from the eye, but the external design is limited
Solution Approach 1:
By repositioning the scanning optical system closer to the nose side and arranging the virtual image forming member on the far side, the patent creates a more compact lateral profile and improved depth distribution. This spatial reconfiguration enhances external design freedom while maintaining the required optical path length for virtual image formation
3Volume of moving object
If the scanning optical system is positioned closer to the nose side, then the device projection to the side and front is reduced, but the optical path length may be constrained
Solution Approach 1:
The patent compensates for the constrained lateral space by extending the optical path in the depth dimension. By positioning the virtual image forming member on the far side of the scanning optical system (further from the wearer), sufficient optical path length is maintained despite the scanning optical system being positioned closer to the nose side, thus reducing lateral projection while preserving optical 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 reduces the feeling of weight and enhances design flexibility by maintaining the center of gravity closer to the wearer's face, allowing for a more comfortable and versatile virtual image display device with a see-through capability.
Implementation Method 1
the virtual-image forming member includes a semitransparent reflection film that reflects the scanning light irradiated from the scanning optical system to form a virtual image, allows the external light to pass
Implementation Method 2
the virtual-image forming member is a transparent base material in which a diffraction grating for forming the virtual image with the scanning light irradiated from the scanning optical system is arranged
Data Source
AI summary
A light emitting device, which is a main body, is arranged to be located closer to the nose NS side than the eye EY of a wearer during wearing of a virtual image display device. Therefore, the light emitting device is prevented from excessively projecting to the side of the face of the wearer. The light emitting device is arranged between the eye EY of the wearer and the virtual-image forming member. Therefore, the light emitting device is prevented from excessively projecting further to the front side than the virtual image forming member, i.e., the front side of the face of the wearer. Further, a combined-light forming unit is a unit small in size and light in weight. Therefore, it is possible to suppress the center of gravity of the entire virtual image forming member from deviating to the side and the front side.