Optical Filter Holding Structure Reducing Stress

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Solution Overview

Problem

Existing optical element holding structures for cameras and lenses apply significant stress to optical filters and lenses, limiting the resolution of high-definition images and videos.

Innovation Solution

A cylindrical body with a front stopper and a rear stopper that allows the optical element to be held in a rotatable manner, reducing stress by using a clearance between the stoppers and incorporating an adhesive for unrotatable fixation, enabling low-stress attachment to a lens-barrel or camera.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the optical element is gripped by the front stopper and rear stopper, then the optical element is held securely, but stress is applied to the optical element

Engineering Contradiction:

Improveholding securityVSAvoidstress on optical element

Core Design Contradiction:

ReliabilityVSStress or pressure

Solution Approach 1:

The patent introduces a cylindrical body as an intermediary structure between the stoppers and the optical element. The optical element is inserted into the cylindrical body which provides lateral support, while the front and rear stoppers only constrain axial movement. This intermediary structure distributes the holding function, allowing secure positioning without direct gripping stress on the optical element itself.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The holding function is segmented into three independent components: the cylindrical body for lateral support and the front stopper and rear stopper for axial positioning. This segmentation allows each component to perform its specific function without applying combined stress, with the optical element resting on the cylindrical body's inner peripheral surface rather than being squeezed between stoppers.

Inventive Principle:

Principle #1Segmentation

2Stress or pressure

If the optical element is held in a rotatable manner, then stress on the optical element is reduced, but the optical element may rattle

Engineering Contradiction:

Improvestress on optical elementVSAvoidpositional stability

Core Design Contradiction:

Stress or pressureVSStability of the object's composition

Solution Approach 1:

The patent carefully controls the dimensional parameters of the cylindrical body's inner peripheral surface and the optical element's outer peripheral surface. By optimizing the fit between these surfaces, the structure achieves a balance where the optical element is sufficiently constrained to prevent rattling while maintaining minimal contact pressure that allows rotatable movement and reduces stress.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9869839B2Optical element holding structure, camera filter frame, camera filter unit, and imaging lens

Publication Date: 2018.01.16 TSUSO

AI summary

A camera filter unit (1) includes an optical filter (2), a filter holding ring (3), and a filter frame (4) that are coaxially disposed in this order from the inside to the outside. The optical filter (2) has a tapered annular chamfered surface (13) on an outer peripheral edge of a rear filter surface (12). The filter holding ring (3) includes a front stopper (21) that is abuttable on the optical filter (2) from a front (X1) and a rear stopper (22) that extends along the annular chamfered surface (13). The filter frame (4) includes a second rear stopper (32) that prevents the optical filter (2) from moving to a rear (X2). The optical filter (2) is held by the filter holding ring (3) in a rotatable manner about an axis L. The optical filter (2) is fixed in a relatively unrotatable manner by the second rear stopper (32) abutting on the rear filter surface (12).