Projector Mount Structure for Optical Alignment Stability
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Solution Overview
Problem
Existing projector installations, particularly those suspended from ceilings, face issues with coupling strength degradation due to environmental factors like oily smoke, leading to solvent cracking and potential misalignment of optical units, which affects image quality.
Innovation Solution
A projector design featuring a metal or crystalline resin first base member with multiple fixing parts and a second base member of lower rigidity, both integrated within the exterior case, where the suspension fitting is securely attached via these parts to prevent strain propagation and maintain optical alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the projector is fixed at four positions in the ceiling suspension fitting with screws and flange nuts, then the coupling strength between the projector and suspension fitting is improved, but the strain from the suspension fitting propagates to the metal shield and causes optical unit misalignment
Solution Approach 1:
The base member is divided into a first base member (metal or crystalline resin) and a second base member (resin), each serving distinct functions. The first base member provides rigid support for optical units, while the second base member provides additional coupling points without transmitting strain to the optical path, thus resolving the contradiction between coupling strength and optical precision
Solution Approach 2:
The second base member acts as an intermediary structure that provides additional coupling points for the suspension fitting. By distributing the coupling load through this separate structure, strain propagation to the metal shield and optical units is prevented, maintaining optical alignment while enhancing overall coupling strength
2Strength
If a metal shield is used to fix optical units, then the coupling strength is improved, but the metal shield transmits strain from the suspension fitting causing optical unit misalignment
Solution Approach 1:
The base member is segmented into two functional parts: the first base member that provides rigid support for optical units, and the second base member that provides additional coupling points. This segmentation allows the coupling function to be separated from the support function, preventing strain transmission to optical units while maintaining coupling strength
Solution Approach 2:
Different regions of the base structure are given different properties: the first base member has high rigidity for optical support, while the second base member has lower rigidity to absorb strain. This local differentiation allows each part to perform its specific function optimally without interfering with the other
Data Source
AI summary
A projector includes: an exterior case having plurality of penetration holes; first base member fixed inside the exterior case and made of metal or crystalline resin; illumination unit fixed to first base member; image forming unit fixed to first base member; optical projection unit coupled to image forming unit; and second base member fixed inside exterior case and coupled to first base member, and having lower rigidity than first base member. First base member has plurality of first fixing parts which are arranged corresponding to position of part of plurality of penetration holes in exterior case and to which suspension fitting is fixed. Second base member has second fixing part which is arranged corresponding to position of penetration hole other than penetration holes having plurality of first fixing parts arranged therein, of plurality of penetration holes in exterior case, and to which suspension fitting is fixed.