Optical Apparatus Guide Barrel Groove Segmentation
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Solution Overview
Problem
Existing optical apparatus designs face challenges in maintaining lens positioning accuracy and optical performance due to rattling issues between the guide barrel and zoom operation ring, exacerbated by the need for longer straight-proceeding grooves that can cause the diameter fitting part to become notched, leading to compromised optical performance.
Innovation Solution
The optical apparatus incorporates a guide barrel with a first guide groove having a bottom on the outer diameter side and a second guide groove as a through hole from the outer to the inner diameter, with these grooves partially overlapping in the optical axis direction to prevent notching and enhance positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If straight-proceeding grooves of each group are shared to increase magnification, then the amount of feeding of each group increases, but the diameter fitting part becomes notched causing positioning accuracy to deteriorate
Solution Approach 1:
The guide barrel is divided into multiple sections with different groove configurations. The first section contains a first straight-proceeding groove for the first lens group, while the second section contains a second straight-proceeding groove for the second lens group. This segmentation allows each groove to be optimized independently, preventing the notching problem while maintaining the ability to achieve high magnification through coordinated movement of multiple lens groups.
Solution Approach 2:
Different sections of the guide barrel are given different local qualities in terms of groove configuration. The first section has a first straight-proceeding groove with specific characteristics optimized for the first lens group, while the second section has a second straight-proceeding groove optimized for the second lens group. This local differentiation allows each section to perform its function optimally without compromising the overall system performance.
2Ease of operation
If the length of straight-proceeding grooves is increased to secure cam ring rotation, then the grooves overlap in the optical axis direction causing notching of the diameter fitting part
Solution Approach 1:
The guide barrel is segmented into multiple sections, each containing straight-proceeding grooves of appropriate lengths optimized for their specific functions. This segmentation allows the cam ring to rotate sufficiently through coordinated action of multiple sections without requiring any single groove to be excessively long, thereby avoiding the notching problem while maintaining ease of operation.
Solution Approach 2:
Instead of extending grooves indefinitely in the optical axis direction (one dimension), the solution uses multiple grooves distributed across different radial positions and sections (adding spatial distribution as another dimension). This allows the cam ring rotation function to be achieved through the combined action of multiple grooves rather than relying on the excessive length of a single groove.
3Manufacturing precision
If the diameter fitting part is formed to be fitted throughout its circumference with no notched portion to suppress rattling, then positioning accuracy is improved, but the groove length must be limited
Solution Approach 1:
The guide barrel is divided into multiple sections, each with its own straight-proceeding groove. This segmentation allows the diameter fitting part to maintain its intact circumferential fitting structure without notches in any single section, thereby suppressing rattling and ensuring positioning accuracy, while the combined length of multiple grooves across sections provides sufficient travel distance for high magnification zoom range.
Data Source
AI summary
Provided is an optical apparatus having good lens positioning accuracy and excellent optical performance.The optical apparatus includes a straight-proceeding barrel configured to move on a lens group in an optical axis direction and a guide barrel having a guide groove part configured to guide the movement of the straight-proceeding barrel in the optical axis direction. In the guide groove part, a first guide groove part is formed in the optical axis direction so as to have a bottom on an outer diameter side, and a second guide groove part is formed in the optical axis direction as a through hole from the outer diameter side to an inner diameter side. The first guide groove part and the second guide groove part are connected to each other and have respective use regions configured to partially overlap each other in the optical axis direction.