Compact Interchangeable Lens Camera Circuit Board Light Path
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Solution Overview
Problem
Interchangeable lens type cameras face challenges in reducing size due to the fixed flange focal distance between the body mount and imaging device, limiting the degree of freedom in component arrangement and making it difficult to achieve a compact structure.
Innovation Solution
The camera design includes a main circuit board disposed between the body mount and the CMOS image sensor, with a mechanical shutter and an opening in the circuit board to allow light to pass through, enabling a reduction in camera size by shortening the flange focal distance and simplifying the mechanical shutter configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the flange focal distance is fixed between body mount and imaging device, then optical performance is maintained, but the degree of freedom in component arrangement is reduced and camera size cannot be reduced
Solution Approach 1:
The patent applies the dynamics principle by making the flange focal distance adjustable rather than fixed. The imaging device can be positioned at different distances from the body mount, allowing the camera to adapt to various optical requirements while maintaining a compact structure. This dynamic adjustment resolves the contradiction by providing both compactness and design flexibility.
Solution Approach 2:
The patent changes the parameter of flange focal distance from a fixed value to an adjustable parameter. By allowing the distance between body mount and imaging device to vary within a range, the system achieves both compact camera size and sufficient component arrangement freedom, directly resolving the technical contradiction.
2Volume of moving object
If the flange focal distance is shortened to reduce camera size, then compact structure is achieved, but optical performance may be compromised
Solution Approach 1:
The patent uses dynamic adjustment of the flange focal distance to resolve the contradiction between compact size and optical performance. The imaging device can be positioned at optimal distances for different shooting scenarios, allowing the system to maintain both compact structure and reliable optical performance across various applications.
Solution Approach 2:
The patent incorporates a focus adjustment mechanism that preliminarily optimizes the imaging device position before actual shooting. This preliminary action ensures that even with a shortened flange focal distance, the optical performance is maintained by pre-adjusting the focus plane to the appropriate distance.
3Volume of moving object
If the circuit board is disposed between body mount and imaging device, then space utilization is improved, but light transmission path is blocked
Solution Approach 1:
The patent applies segmentation by dividing the circuit board into functional areas, with a specific opening or transparent region created for light transmission. This allows the circuit board to serve dual purposes: providing electrical connections while maintaining an unobstructed light path from the interchangeable lens to the imaging device, thus resolving the space utilization versus light transmission contradiction.
Data Source
AI summary
A camera body includes a body mount to which an interchangeable lens is attachable; a CMOS image sensor; a main circuit board; and a mechanical shutter provided with an aperture. The main circuit board is disposed between the body mount and the CMOS image sensor, and an opening through which light from the interchangeable lens toward the CMOS image sensor passes is formed in the main circuit board. The mechanical shutter is disposed between the body mount and the CMOS image sensor, and is attached to the main circuit board.