Particle Analyzer Lens Structure for UV and Chromatic Aberration Control
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Solution Overview
Problem
Optical characteristics of objective lenses in fluorescence observation devices deteriorate due to burning of adhesives and outgas from laser light, especially with ultraviolet lasers, and chromatic aberration is difficult to correct in wide bands due to poor glass transmittance.
Innovation Solution
A lens structure with multiple lenses arranged along the optical axis, held by a lens frame without adhesive, and designed to correct chromatic aberration using specific glass materials and configurations, such as retrofocus or telephoto configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesive is used to assemble objective lens, then ease of manufacture is improved, but optical characteristics deteriorate due to burning of adhesive by laser light
Solution Approach 1:
The patent removes the adhesive from the objective lens assembly by using a mechanical retention structure (groove and protrusion) instead. This extraction of the harmful adhesive eliminates the burning problem while maintaining ease of assembly through the mechanical interface design.
Solution Approach 2:
The patent introduces a mechanical intermediary structure (groove and protrusion) to replace the adhesive as the bonding agent. This intermediary mechanical structure provides both retention function and optical transparency, eliminating the harmful chemical adhesive while maintaining assembly ease.
2Difficulty of detecting and measuring
If ultraviolet laser is used, then measurement capability is improved, but adhesive burning becomes more severe
Solution Approach 1:
The patent removes the adhesive that is susceptible to ultraviolet-induced burning. By using a mechanical retention structure instead, the system maintains ultraviolet laser measurement capability while eliminating the harmful burning effect that would otherwise occur.
3Measurement precision
If multiple types of optical glass are used to correct chromatic aberration, then measurement precision is improved, but transmittance characteristics deteriorate due to absorption
Solution Approach 1:
The patent applies different glass types to different portions of the objective lens (e.g., ultraviolet-resistant glass in the ultraviolet region, crown glass in the visible region). This local differentiation allows each region to be optimized for its specific wavelength requirements, achieving both chromatic aberration correction and high transmittance.
Solution Approach 2:
The patent uses a composite optical system combining multiple glass types with complementary characteristics. The ultraviolet-resistant glass provides high transmittance in the UV region while the crown glass corrects chromatic aberration in the visible region, achieving both goals simultaneously through material composition.
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
Prevents adhesive burning and ensures high transmittance in the ultraviolet region while effectively correcting chromatic aberration, maintaining optical performance and reducing costs.
Implementation Method 1
a lens structure that collects the excitation light at a predetermined position in a flow path
Implementation Method 2
a lens structure that collects the excitation light at a predetermined position in a flow path
Implementation Method 3
a detection unit that detects light emitted from a particle as the particle flowing through the predetermined position is excited by the excitation light
Data Source
AI summary
A particle analyzer (100) includes: a light source that emits excitation light (EL1) including light having a wavelength of 400 nm or less; a lens structure (41) that collects excitation light (EL1) at a predetermined position (51s) in a flow path (53); a detection unit (7) that detects light (FL) emitted from a particle as the particle (51) flowing through the predetermined position is excited by the excitation light (EL1); and a processing unit (120) that processes detection data acquired by the detection unit (7). The lens structure (41) includes a plurality of lenses (411) arranged along an optical axis of the excitation light (EL1); and a lens frame (412) holding the plurality of lenses (411). At least one (G12) of the plurality of lenses (411) is positioned in the lens frame (412) by abutting on a lens adjacent to the lens.