Folded-Path Telephoto Optics for Thin Image Capture
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Solution Overview
Problem
The implementation of a telephoto optical image capture apparatus is challenging due to size and thickness limitations in electronic devices, limiting photography capabilities.
Innovation Solution
An optical image capture apparatus is designed with a front lens group, optical redirecting assembly, fixed lens group, focusing lens module, and image sensor, utilizing an optical redirecting component with incident, reflective, and emergent surfaces to align lenses and increase focal length, and includes an actuator to adjust lens positions and offset handshakes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a telephoto optical image capture apparatus is implemented, then the focal length is increased, but the device size and thickness increase
Solution Approach 1:
The patent introduces an optical redirecting component that changes the optical path direction by 90 degrees, allowing the light to travel in a compact folded path within the device. This enables achieving a long focal length (e.g., 64mm or longer) while keeping the device thickness and volume small, as the light path is redirected along the thickness direction rather than extending horizontally
2Length of moving object
If a telephoto optical image capture apparatus is implemented, then the focal length is increased, but the device thickness increases
Solution Approach 1:
The optical redirecting component folds the optical path along the thickness direction, enabling the focal length to be extended vertically rather than increasing horizontal device dimensions. This allows achieving telephoto focal lengths while maintaining thin device profile
3Measurement precision
If lenses are added to increase focal length, then the imaging quality is improved, but the device complexity increases
Solution Approach 1:
The optical system is divided into multiple lens groups (first lens group, second lens group, third lens group) with distinct functions. The first lens group handles incident light, the second lens group contains the optical redirecting component, and the third lens group handles focusing. This segmentation allows each group to be optimized independently while maintaining overall system manageability and imaging quality
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 apparatus provides photography at a longer focal length and enhances light capture, maintaining imaging quality by aligning lenses and compensating for handshakes, achieving clear images with minimal distortion.
Implementation Method 1
The optical redirecting component is provided with an incident surface, a reflective surface, and an emergent surface. The contact portion is substantially in contact with the incident surface, to enable the incident axis to pass through the incident surface, be reflected on the reflective surface, and pass through the emergent surface as an emergent axis.
Implementation Method 2
The optical image capture apparatus includes a front lens group, an optical redirecting assembly, a fixed lens group, a focusing lens module, and an image sensor. The incident axis passes through the incident surface, is refracted by the front lens group, reflected on the reflective surface, and continues through the fixed lens group and focusing lens group to form an image on the image sensor.
Data Source
AI summary
An optical image capture apparatus includes a front lens group, an optical redirecting assembly, a fixed lens group, a focusing lens module, and an image sensor. The optical redirecting assembly includes an optical redirecting component which has an incident surface, a reflective surface, and an emergent surface. The front lens group's contact portion is in contact with the incident surface, an incident axis passes through the incident surface, be reflected on the reflective surface, and passes through the emergent surface as an emergent axis. The focusing lens module is adjacent to the fixed lens group and includes a focusing lens group and an actuator. The fixed lens group and the focusing lens group are aligned with the emergent axis, and the actuator actuates the focusing lens group to move along the emergent axis. The image sensor is adjacent to the focusing lens module and substantially aligned with the emergent axis.