Zoom Lens Cam Frame Interference Prevention

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Solution Overview

Problem

Conventional zoom lens cam frames face interference issues due to overlapping regions during zooming operations, which affect the movement of lens groups as the increased length of cam grooves and overlapping regions lead to interference between cam grooves in different regions.

Innovation Solution

The cam frame design includes overlapping regions with specific cam grooves and connecting grooves, where the first cam groove has a zooming-collapsing operation portion and an introducing groove connects to the end surface, while the first connecting groove connects the second and third cam grooves, avoiding interference by altering the connection method between cam grooves.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the regions Z1, Z2 and Z3 are made to overlap to achieve higher lens magnification and larger displacements, then the zooming performance is improved, but the cam grooves in one region interfere with the introducing groove in another region

Engineering Contradiction:

Improvezooming performanceVSAvoidinterference between cam grooves

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The cam frame is divided into multiple sets of cam grooves (first set, second set, third set) with each set having introducing grooves that are spatially segmented and positioned to avoid interference. The first set of cam grooves has an introducing groove, the second set has another introducing groove, and the third set has a third introducing groove, allowing overlapping regions to coexist without interference.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The solution transitions from a two-dimensional layout where regions cannot overlap to a three-dimensional spatial arrangement where multiple introducing grooves are positioned at different angular positions around the cam frame. This allows regions Z1, Z2, and Z3 to overlap while maintaining separate introducing groove pathways that do not interfere with each other.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Length of moving object

If increased lengths of cam grooves are used to achieve larger displacements of lens groups, then the zooming range is improved, but the complexity of the cam frame structure increases

Engineering Contradiction:

Improvedisplacement of lens groupsVSAvoidcam frame structure

Core Design Contradiction:

Length of moving objectVSDevice complexity

Solution Approach 1:

Multiple sets of cam grooves (first set, second set, third set) are designed with identical structures that can guide pins of different lens groups through similar motion paths. This universal design allows the cam frame to achieve large displacements for multiple lens groups simultaneously without proportionally increasing structural complexity, as each set follows the same functional pattern.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS9223111B2Zoom lens and cam frame thereof

Publication Date: 2015.12.29 SINTAI OPTICAL SHENZHEN CO LTD

AI summary

A cam frame of a zoom lens is provided. The cam frame includes an end surface, a first cam groove including a first connecting portion, a second connecting portion and a zooming-collapsing operation portion connected between the first connecting portion and the second connecting portion, an introducing groove connecting the end surface and the first connecting portion, a second cam groove, and a first connecting groove connecting the second connecting portion and the second cam groove.