Prism Fixing Structure With Baffle And Slot For Projection Optical Machine
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Solution Overview
Problem
The issue of defocus in projection optical machines arises due to thermal expansion of the fixed glue point causing the prism to shift from its original position, leading to a decrease in image quality as the machine operates for extended periods.
Innovation Solution
A prism fixing structure is designed with a slot, bearing surface, and baffle, where the glue point is positioned between the prism's side edge and the bearing surface, and the baffle is fitted with the hypotenuse, allowing the glue to expand and exert force while the baffle provides support and static friction to maintain the prism's position, preventing shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the prism is fixed using only a glue point, then the structure is simple and easy to manufacture, but the prism shifts position due to thermal expansion causing defocus
Solution Approach 1:
The fixing structure is segmented into multiple functional components: the glue point provides initial bonding, the baffle provides lateral support and positioning, and the slot provides longitudinal constraint. This segmentation allows each component to perform its specific function, collectively preventing prism displacement while maintaining manufacturing simplicity.
Solution Approach 2:
The baffle acts as an intermediary component between the prism and the housing body. It translates the thermal expansion force of the glue point into a controlled support mechanism, where the baffle's static friction force counteracts the expansion force to prevent prism displacement.
2Strength
If the glue point is positioned to provide strong bonding, then the prism is securely attached, but thermal expansion of the glue causes the prism to shift
Solution Approach 1:
The thermal expansion of the glue point, which initially causes harm by pushing the prism and causing displacement, is converted into a benefit. The expansion force presses the prism against the baffle, increasing the normal force and thereby increasing the static friction force between the baffle and prism, which prevents displacement.
Solution Approach 2:
The system utilizes parameter changes in the glue point's physical state. As temperature increases, the glue point expands (parameter change in volume), and this expansion is harnessed to increase the contact pressure between the prism and baffle, thereby increasing friction and stabilizing the prism position.
3Manufacturing precision
If a complex fixing structure is used to prevent prism displacement, then position stability is improved, but the device complexity increases
Solution Approach 1:
The baffle serves multiple functions simultaneously: it provides lateral support to the prism, acts as a positioning element within the slot, generates static friction to counteract thermal expansion forces, and guides the prism during assembly. This multi-functionality reduces the need for additional components, maintaining structural simplicity while ensuring position stability.
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 effectively prevents the prism from shifting due to thermal expansion, thereby avoiding the defocus phenomenon and ensuring consistent image quality over time.
Implementation Method 1
due to the rise in temperature, the glue point is expanded due to heat to exert the effect of force on prism
Implementation Method 2
baffle generates support force Fn and static friction force Fr on prism
Data Source
AI summary
Disclosed are a prism fixing structure of the optical machine and a projection optical machine. The prism fixing structure of an optical machine includes a body and a prism, the body is provided with a slot, a bearing surface and a baffle, and the prism includes a first side edge, a second side edge and a hypotenuse connected end to end; a glue point is provided between the first side edge and the bearing surface, the hypotenuse is fitted with the baffle, and an oblique angle end formed by the second side edge and the hypotenuse is clamped in the slot.