Periscope Lens Aperture Segmentation for Peripheral Light
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Solution Overview
Problem
Conventional periscope-type imaging lens assemblies are not suitable for wide-angle lenses as they significantly decrease the amount of peripheral light, making them unsuitable for thin and optically performing imaging devices.
Innovation Solution
An imaging lens assembly is designed with an optical member that bends incident light, a lens group on the image side to image the bent light, and a light-shielding member with a light-shielding mask and an aperture stop to partially shield the light, ensuring sufficient peripheral light is maintained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a conventional periscope-type imaging lens assembly is applied to a wide-angle lens, then the imaging device can be made thin, but the amount of peripheral light is significantly decreased
Solution Approach 1:
The light-shielding member is divided into two separate components: a light-shielding mask with a first aperture and an aperture stop with a second aperture. This segmentation allows independent optimization of each aperture's size and position, enabling sufficient peripheral light transmission while maintaining the periscope-type compact structure.
Solution Approach 2:
Different regions of the light path are treated differently through the two apertures. The first aperture in the light-shielding mask is positioned and sized to control light at one location, while the second aperture in the aperture stop controls light at another location. This local quality adjustment ensures adequate peripheral light reaches the imaging surface without compromising the thin profile.
2Illumination intensity
If the size of the first aperture (dm) is increased to improve peripheral light, then more light reaches the imaging surface, but the diagonal angle of view constraint must be satisfied
Solution Approach 1:
The design establishes dynamic relationships between aperture sizes and the diagonal angle of view through the constraint tan(DFOV/2) > 0.59. The aperture dimensions are not fixed but are optimized in relation to the required field of view, allowing the system to adapt to different wide-angle requirements while maintaining sufficient peripheral light.
Solution Approach 2:
The patent optimizes multiple parameters simultaneously: the sizes of both apertures (dm and da), their positions, and the diagonal angle of view. By changing these parameters in a coordinated manner and satisfying the constraint dm ≥ da along with tan(DFOV/2) > 0.59, the system achieves both adequate peripheral light transmission and the required wide-angle performance.
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 creation of thin imaging devices with favorable optical performance by maintaining sufficient peripheral light, even when used in wide-angle lenses, thereby enhancing image quality and reducing noise.
Implementation Method 1
an optical member configured to bend an incident light incident from an object side toward an image side
Implementation Method 2
an optical member configured to bend an incident light incident from an object side toward an image side
Data Source
AI summary
An imaging lens assembly includes an optical member, a lens group, and a light-shielding member. The optical member is configured to bend an incident light incident from an object side toward an image side. The lens group is disposed on the image side of the optical member and configured to image the incident light bent by the optical member on an imaging surface. The light-shielding member partially shields the incident light. The light-shielding member includes a light-shielding mask and an aperture stop. The light-shielding member is provided with a first aperture partially transmitting the incident light. The aperture stop partially shields the incident light on the image side of the optical member and is provided with a second aperture partially transmitting the incident light. The imaging lens assembly is configured such that tan(DFOV)>0.59, dm≥da.