Stage Apparatus with Conductive Member Escape Recess for Miniaturization
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Solution Overview
Problem
Existing camera shake correction apparatuses face challenges in miniaturization, particularly in single-lens reflex cameras with large control circuit boards, as they require a large control circuit board due to numerous electronic components, making it difficult to implement structures that shorten the distance between the rear yoke and control circuit board, thereby increasing the camera's size in the optical axis direction.
Innovation Solution
A stage apparatus with a stationary support member and a stage member that are slidably movable, featuring a flexible conductive member with one end connected to an electronic component and the other to the control circuit board, and a driver generating a driving force, where the stationary support member includes a conductive member escape recess to accommodate the flexible conductive member, allowing for reduced thickness dimensions even with a large control circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the control circuit board is arranged on the same plane as the rear yoke to shorten the distance between them, then the camera body size is reduced, but the control circuit board cannot be large enough to accommodate numerous electronic components
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional stacked arrangement. The control circuit board is positioned on the rear surface of the rear yoke, utilizing the thickness direction (optical axis direction) to accommodate a large control circuit board without increasing the in-plane dimensions. This dimensional transition allows both the rear yoke and control circuit board to coexist in a compact configuration while providing sufficient area for electronic components.
2Area of stationary object
If the control circuit board is arranged behind the rear yoke in the optical axis direction, then a large control circuit board can be used, but the distance between the rear yoke and control circuit board increases, enlarging the camera body
Solution Approach 1:
The patent merges the control circuit board with the rear yoke by positioning the control circuit board on the rear surface of the rear yoke. This integration allows the control circuit board to be effectively part of the rear yoke assembly, reducing the overall distance between the two components. The merged configuration enables a large control circuit board to be accommodated without proportionally increasing the camera body size, as the control circuit board shares the spatial envelope with the rear yoke.
3Reliability
If the flexible printed circuit board extends from the image sensor to the control circuit board through the rear yoke, then electrical connection is achieved, but the rear yoke thickness must increase to accommodate the FPC board
Solution Approach 1:
The patent applies the nesting principle by routing the flexible printed circuit board through a through-hole formed in the rear yoke. The FPC board is nested within the rear yoke structure, passing through the thickness direction. This nested configuration allows the FPC board to traverse the rear yoke without requiring additional thickness, as the through-hole provides a dedicated pathway that integrates with the existing rear yoke geometry. The electrical connection is maintained reliably while the rear yoke thickness remains optimized.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables a reduction in the thickness direction dimensions between the stationary support member and control circuit board, allowing for miniaturization of the camera shake correction apparatus, accommodating larger control circuit boards while maintaining effective image-shake correction capabilities.
Implementation Method 1
The permanent magnets, the front yoke and the rear yoke form magnetic fields, and the respective coils stay within these magnetic fields regardless of the position of the stage plate
Implementation Method 2
the controller passes an electric current through the coils. Consequently, each coil produces a driving force, whereby the stage plate and the image sensor slidably move
Data Source
AI summary
A stage apparatus includes a control circuit board, a stationary support member facing the control circuit board, a stage member superposing the stationary support member and provided on the opposite side of the stationary support member to the control circuit board, the stage member being movable relative to the stationary support member in a plane; an electronic component fixed to the stage member; a flexible conductive member, one end thereof connected to the electronic component and the other end thereof connected to the control circuit board; and a driver generating a driving force for moving the stage plate. The stationary support member includes a conductive member escape recess, recessed from a peripheral edge toward a central portion thereof and extending through the stationary support member in the thickness direction. Part of the flexible conductive member is inside the conductive member escape recess.