Image Sensor Focus Adjustment Mechanism
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Solution Overview
Problem
Current image sensors face challenges in achieving precise focusing, especially at high resolutions, due to manufacturing tolerances and the need for complex configurations and costly precision control, which affects production efficiency and cost.
Innovation Solution
An image sensor with a focus adjusting device comprising passive and active components that adjust the distance between the housing and the scanner cover plate, allowing for precise focusing without the need for multiple pads of different thicknesses, using a combination of contact elements, focus varying mechanisms, and fine adjusting elements to accommodate various scanning objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple pads of different thickness are used to ensure precise focusing, then focus precision is improved, but device complexity and production cost increase
Solution Approach 1:
The patent introduces a focus adjusting device with movable components including a focus adjusting element that can be positioned at different heights, and a contact element that moves with the focus adjusting element. This dynamic adjustment mechanism replaces the static multiple pads approach, allowing a single pad thickness to accommodate various focus requirements through active positioning rather than passive selection from multiple fixed thickness options.
2Measurement precision
If strictly control the dimension precision of scanner components during manufacturing, then focus precision is improved, but manufacturing cost and production time increase
Solution Approach 1:
The focus adjusting device is designed with pre-positioned adjustment mechanisms that can be set during assembly. The contact element and focus adjusting element are configured to move to precise positions during the focusing process, eliminating the need for extremely tight manufacturing tolerances on all components. This preliminary configuration of adjustment capability allows standard manufacturing processes to produce acceptable results without requiring expensive high-precision machining of every component.
3Measurement precision
If strictly control the dimension precision of scanner components during manufacturing, then focus precision is improved, but manufacturing cost increases
Solution Approach 1:
By implementing a dynamic focus adjusting mechanism with movable contact elements and adjustable focus elements, the system compensates for normal manufacturing tolerances. This allows the use of standard, cost-effective manufacturing processes rather than expensive high-precision manufacturing, while still achieving the required focus precision through active adjustment rather than relying solely on passive manufacturing accuracy.
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
Ensures high-quality scanning performance by allowing precise focus adjustment, reducing production costs and complexity, and improving scanning resolution without increasing manufacturing precision requirements.
Implementation Method 1
The contact element is moved along with the movement of the focus fine adjusting element, whereby the distance between an upper surface of the housing and the bottom of the cover plate is thus changed to implement focus adjustment
Implementation Method 2
a lens for gathering the light reflected from the object being scanned and focusing the reflected light on the image sensing elements of the sensing substrate
Data Source
AI summary
A focus adjusting device (50) for an image sensor (1) is provided for ensuring precise focusing of the image sensor. The focus adjusting device includes a contact element (51) in direct contact with the bottom of a scanner cover plate, a focus varying element (53) engaging with the contact element, and a focus fine adjusting element (55) movably mounted on a housing of the image sensor. The focus varying element and the contact element are driven to correspondingly move vertically together with the vertical movement of the focus fine adjusting element, whereby the distance between an upper surface of the housing and the bottom of the cover plate is thus changed for precise focusing.