Optical Element Adhesive Bonding With Calibrated Gap Control
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Solution Overview
Problem
In microlithography, achieving a precise and reliable adhesive gap between components like actuators and optical elements is challenging due to manufacturing geometry deviations, adhesive viscosity fluctuations, and gravitational influences, which can introduce mechanical stresses and optical aberrations.
Innovation Solution
A method involving a positioning device that allows for calibration of relative positions between components before applying adhesive, using distance sensors and mechanical stops to set a precise adhesive gap, and applying adhesive at a controlled distance to avoid mechanical stresses, with optional calibration using a geometry-matching calibration element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied to join components, then bonding strength is achieved, but precise control of adhesive gap becomes difficult due to viscosity fluctuations and manufacturing deviations
Solution Approach 1:
The positioning device calibrates the relative position between components before adhesive application. The calibration process establishes precise reference positions (first calibration for adhesive gap distance, second calibration for parallelism) so that when adhesive is applied and components are brought together, the gap is already pre-determined and controlled, eliminating the need to rely solely on adhesive viscosity for gap control.
Solution Approach 2:
The positioning device acts as an intermediary between the components and the adhesive bonding process. It provides mechanical reference elements and calibration mechanisms that mediate the positioning, ensuring that the adhesive gap is controlled by the positioning device's calibrated dimensions rather than by adhesive flow behavior alone.
2Manufacturing precision
If components are positioned with high precision, then adhesive gap accuracy is improved, but mechanical stresses and deformations may be introduced into actuators or optical elements
Solution Approach 1:
The positioning device performs calibration and positioning operations before adhesive application. By establishing the precise relative position in advance using the positioning device's calibrated reference elements, the components can be gently brought together without requiring high-force mechanical pressing during bonding, thus achieving precision without introducing excessive mechanical stress.
Solution Approach 2:
The invention replaces reliance on mechanical force and pressure during adhesive bonding with a positioning system based on calibrated geometric references. The adhesive gap is controlled by the positioning device's predetermined dimensions rather than by mechanical compression, reducing stress on the components.
3Reliability
If adhesive gap is tightly controlled, then optical aberrations are reduced, but the process becomes more sensitive to manufacturing deviations and gravitational influences
Solution Approach 1:
The positioning device serves as a stable intermediary reference system that is insensitive to manufacturing deviations and gravitational influences. By using the positioning device's calibrated reference elements as the basis for gap control rather than relying on component geometry alone, the system achieves tight gap control without proportionally increasing sensitivity to other sources of variation.
Solution Approach 2:
The positioning device creates a reference copy or model of the desired geometric relationship through its calibrated reference elements. This reference copy provides a stable template for positioning that is independent of the actual component manufacturing variations, allowing precise gap control without directly amplifying the impact of manufacturing deviations.
Data Source
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AI summary
The invention relates to a method and a device for producing an adhesive bond between a first component and a second component for microlithography, wherein the second component is an optical element. A method comprises the following steps: Introducing the first component and the second component into a positioning device (100), which makes it possible to change the relative position between first and second components, calibrating a first relative position, in which a distance between first and second components has a first value defining a predefined adhesive gap, calibrating a second relative position, in which a distance between first and second components has a second value, which is greater than the first value, applying adhesive (26) to the first component while first and second components are at a distance from one another which is greater than the first value, and setting the first relative position while forming the adhesive bond between first and second components, wherein both calibrating the first relative position and calibrating the second relative position are carried out still before applying the adhesive to the first component.