Projection Apparatus Fixing Structure with Radial Rib Interference
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Solution Overview
Problem
Existing methods for fixing optical devices in smaller-sized projection products increase the overall size of the product or complicate the assembly process, as they often require additional parts such as adhesives, screws, and covers.
Innovation Solution
A fixing structure with an inner wall and a protruded rib that forms a through hole, where the rib interferes with the optical device to securely fix it without additional parts, simplifying the assembly process and reducing the number of components needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive or screw methods are used to fix the optical device, then the fixation reliability is improved, but the device complexity and number of parts increase
Solution Approach 1:
The fixing structure integrates the fixation function directly into the housing structure by forming protrusions on the inner wall that engage with grooves on the optical device. This merging of the fixing mechanism into the housing eliminates the need for separate adhesives or screws, thereby maintaining fixation reliability while reducing structural complexity and part count.
Solution Approach 2:
The housing structure provides its own fixation capability through the protrusions formed on its inner wall. Instead of requiring external fixing components, the housing itself serves the dual purpose of containing and securing the optical device through the interference fit between protrusions and grooves,实现自固定功能。
2Strength
If additional fixing parts are used, then the fixation strength is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The fixing structure combines the housing and fixation mechanism into a single integrated component. The protrusions are formed directly on the housing inner wall, eliminating the need for separate fixing parts and simplifying the manufacturing process to a single molding operation, thereby improving ease of manufacture while maintaining fixation strength.
Solution Approach 2:
The invention changes the geometric parameters of the housing inner wall by forming protrusions with specific dimensions that match the grooves on the optical device. This parameter optimization allows the housing itself to provide sufficient fixation strength without additional parts, simplifying manufacturing while ensuring secure assembly.
3Volume of moving object
If a compact design is pursued, then the volume is reduced, but the ease of operation deteriorates
Solution Approach 1:
The integration of the fixing mechanism into the housing structure eliminates the need for separate fixing components, allowing for a more compact overall design. The protrusions and grooves engage directly within the housing cavity, reducing the space required for assembly while maintaining ease of operation through the simple snap-fit mechanism.
4Quantity of substance
If interference fit is used to fix the optical device, then the number of parts is reduced, but the manufacturing precision requirement increases
Solution Approach 1:
The invention optimizes the dimensional parameters of the protrusions and grooves to achieve a balanced interference fit. By carefully controlling the size and shape parameters of these features, the design reduces the number of parts while maintaining reasonable manufacturing precision requirements that can be achieved through standard molding processes.
Data Source
AI summary
The invention provides a fixing structure having an inner wall forming a through hole around a central axis and a first rib protruded from the inner wall toward the central axis along a radial direction of the through hole with an extending direction parallel to an axial direction of the central axis, and a projection apparatus including an illumination system, a light valve, and a projection lens. The illumination system includes the fixing structure, an optical device, and a light source illuminating the optical device to form an illumination beam. The optical device is placed in the through hole and interfered by the first rib to be fixed in the through hole. The light valve is located on a transmission path of the illumination beam and converts it into an image beam. The projection lens is located on a transmission path of the image beam and projects the image beam.