Lens Frame Inclination Correction in Optical Projection
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Solution Overview
Problem
The existing optical projection devices face issues with inclination of lens frames relative to the optical axis, leading to image distortion due to misalignment of cam pins and centers of gravity, which complicates movement and increases power consumption.
Innovation Solution
Incorporating a correction portion, such as an urging portion, to counteract the inclination of movable lens frames by urging them in directions intersecting with the optical axis, allowing for improved alignment and reduced distortion, enabling miniaturization and efficient movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cam pin is positioned far from the center of gravity to enable independent movement of lens frames, then the lens frames can be moved independently, but the lens frame becomes inclined relative to the optical axis causing image distortion
Solution Approach 1:
The patent introduces a correction portion as an intermediary element between the cam pin mechanism and the lens frame. This correction portion receives the lens frame and applies corrective force to prevent inclination, thereby mediating between the independent movement requirement and the alignment precision requirement
2Ease of operation
If the cam pin and center of gravity are spaced apart to enable lens frame movement, then the lens frame can be moved, but the operational force increases and movement becomes less smooth
Solution Approach 1:
The correction portion functions as a counterbalancing mechanism that offsets the unfavorable moment created by the spaced-apart cam pin and center of gravity. By applying corrective force in the opposite direction, it counteracts the tendency toward inclination and reduces the operational force required for smooth movement
Data Source
AI summary
A optical projection device that projects an image with excellent image quality while achieving miniaturization is provided. The optical projection device includes a first lens frame holding a first lens group L1 and including a cam pin, a guide barrel including a straight movement groove, a cam barrel including a cam groove, and an urging portion that urges the first lens frame in a direction intersecting with the direction along an optical axis. The cam pin is formed at a position spaced apart from a center of gravity including the first lens frame and members attached to the first lens frame in the direction along the optical axis Ax and the urging portion urges the first lens frame at a position closer than the cam pin with respect to the center of gravity in the direction along the optical axis.