Imaging Lens Barrel Segmentation for Stable Light Shielding
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Solution Overview
Problem
In image reading devices, the adjustment of the imaging lens to prevent flare light from entering the imaging part is challenging due to variations in the gap between the imaging lens and light shielding members, leading to inconsistent light shielding and difficulties in maintaining proper optical path alignment during magnification adjustments, especially with miniaturized lenses.
Innovation Solution
The design incorporates an imaging lens with a constant diameter body and larger diameter end parts, along with light shielding walls that create a space with an interval larger than the body part diameter but smaller than the end parts, allowing the body part to be positioned within this space and effectively shield light in the optical axis direction, ensuring stable light shielding and adjustment capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the imaging lens is moved in the optical axial direction to adjust magnification, then the magnification adjustment capability is improved, but the gap between the imaging lens and light shielding member varies causing inconsistent light shielding
Solution Approach 1:
The imaging lens barrel is divided into three distinct sections: a first barrel part at the incident light side with a smaller diameter, a second barrel part at the downstream side with a larger diameter, and an intermediate barrel part connecting them. This segmentation allows each part to serve a specific function - the larger downstream part ensures consistent light shielding while the smaller incident part maintains optical performance during magnification adjustment.
Solution Approach 2:
Different sections of the imaging lens barrel are given different diameters according to their specific functional requirements. The incident side has a smaller diameter to maintain optical characteristics, while the downstream side has a larger diameter to ensure reliable light shielding. This local differentiation resolves the contradiction by optimizing each region for its primary function.
2Volume of moving object
If the diameter of the incident side barrel part is made smaller to accommodate miniaturized lenses, then the lens miniaturization is achieved, but the pressuring member hits on the leading end destabilizing pressuring balance
Solution Approach 1:
The barrel is segmented into three parts with the pressuring member positioned to contact only the intermediate or downstream barrel part, not the smallest incident side part. This segmentation allows the pressuring member to maintain stable contact on a larger diameter surface while the incident side remains miniaturized for optimal optical performance.
Solution Approach 2:
The pressuring member is strategically positioned to contact a specific section of the barrel (intermediate or downstream part) that has sufficient diameter for stable pressing. This local quality differentiation allows the incident side to be miniaturized while maintaining pressuring balance through the larger diameter sections.
3Stability of the object's composition
If the leading end of the imaging lens is lengthened to prevent pressuring member contact, then the pressuring balance is stabilized, but the pressuring member still easily hits on the leading end
Solution Approach 1:
The barrel is divided into three parts where the intermediate barrel part serves as a transition zone. The pressuring member is positioned to contact this intermediate part or the downstream part, creating a clear separation between the pressing contact zone and the incident light zone. This segmentation prevents the pressuring member from hitting the leading end while maintaining compact overall length.
4Object-affected harmful factors
If a light shielding member with a through hole is provided between the lens and CCD, then the flare light shielding is achieved, but the interval between the imaging lens and light shielding member varies when the lens is moved, causing potential loss of optical path or inadequate shielding
Solution Approach 1:
The light shielding function is merged into the imaging lens barrel structure itself rather than being a separate movable component. The downstream barrel part with its larger diameter acts as an integrated light shield, eliminating the need for additional light shielding members and their associated adjustment mechanisms.
Solution Approach 2:
The downstream barrel part of the imaging lens serves multiple functions: it provides structural support for the lens, maintains the optical path, and simultaneously acts as a light shielding member. This multi-functionality eliminates the need for separate light shielding components and simplifies the overall structure.
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 securely shields unnecessary light, maintains high-quality image capture by preventing flare light from reaching the imaging part, and allows for precise adjustment of the imaging lens during magnification, enhancing the stability and manufacturing efficiency of the image reading device.
Implementation Method 1
The imaging lens captures an incident light onto an imaging part, such as a charge coupled device (CCD)
Implementation Method 2
The imaging part picks up an image by photoelectrically converting the reflected light from the document captured by the imaging lens to generate image data
Data Source
AI summary
A development device includes an imaging lens and light shielding walls. The imaging lens includes a body part having a constant diameter and both end parts arranged at both ends in an optical axial direction having diameters larger than the body part to capture a reflected light from a document onto an imaging part. The light shielding walls has a space with an interval larger than the diameter of the body part and smaller than the diameters of the both end parts, allowing the body part of the imaging lens to be arranged in the space, and shielding a light in the optical axial direction.