Collimator Lens Arrangement for Telecentricity and Size Reduction
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Solution Overview
Problem
Existing optical systems for imaging apparatuses face challenges in achieving satisfactory optical performance while downsizing, particularly in maintaining telecentric properties and correcting aberrations due to inappropriate refractive power and lens arrangement in collimator systems.
Innovation Solution
The optical system comprises a first lens unit with positive or negative refractive power and a second lens unit, both with positive refractive power, disposed at the widest interval, including at least one positive and one negative lens each, to enhance telecentric properties and reduce system length, while the second lens unit further diverges light to achieve parallelism and correct chromatic aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the collimator optical system uses a plurality of lenses with inappropriate refractive power and arrangement, then the system can be downsized, but satisfactory optical performance (telecentric properties and aberration correction) cannot be achieved
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers of the first and second lens units and setting their arrangement at the widest interval. Specifically, the first lens unit has positive or negative refractive power while the second lens unit has positive refractive power, with their distances and focal lengths carefully controlled to achieve both compact size and high optical performance including telecentricity and aberration correction
Solution Approach 2:
The patent applies local quality by configuring the first lens unit with at least one positive lens and at least one negative lens arranged in specific orders from the object side. This local differentiation of lens types and their positions enables the compact system to achieve satisfactory optical performance through localized optical corrections
2Length of moving object
If the first lens unit consists of at least one positive lens and at least one negative lens disposed in order from the object side, then telecentric properties are enhanced and system length is reduced, but the lens arrangement complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the collimator optical system into two distinct lens units: a first lens unit with positive or negative refractive power and a second lens unit with positive refractive power. This segmentation allows each unit to be optimized independently for specific functions (telecentricity and parallel light generation), reducing overall system length while maintaining manageable complexity through functional division
3Stability of the object's composition
If the second lens unit further diverges light to achieve parallelism, then parallel light quality is improved, but chromatic aberration correction becomes more challenging
Solution Approach 1:
The patent applies composite materials by combining lenses with different refractive properties in the second lens unit. The second lens unit contains at least one positive lens and at least one negative lens made of different glass materials with distinct refractive indices and Abbe numbers, creating a composite optical system that achieves both parallel light quality and chromatic aberration correction through material diversity
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 allows for satisfactory optical performance with a downsized system, effectively reducing parallax and achieving high-quality imaging by positioning the principal point closer to the image and shortening the first lens unit, while maintaining telecentricity and correcting aberrations.
Implementation Method 1
an optical system for converting light from an object into parallel light, and guiding the parallel light to a plurality of image forming units
Data Source
AI summary
An optical system for converting light from an object into parallel light, and guiding the parallel light to a plurality of image forming units each configured to form an image of the object includes a first lens unit having positive or negative refractive power and a second lens unit having positive refractive power that are disposed in order from an object side, wherein the first lens unit and the second lens unit are disposed at a widest interval in the optical system, and wherein the first lens unit consists of at least one positive lens and at least one negative lens that are disposed in order from the object side.