Mirror Driving Device Shock Dispersion Surface
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Solution Overview
Problem
The quick-return mirror mechanism in single-lens reflex cameras experiences mirror shock during rotation, leading to image blur and reduced consecutive shooting speed, as the sub-mirror vibration is not quickly settled, hindering ranging performance.
Innovation Solution
A mirror driving device with a shock dispersion surface on the mirror holder that contacts the positioner before the positioning surface, reducing shock by having a smaller inclination relative to the travel-direction tangent line, allowing for efficient vibration reduction and quicker stabilization of the sub-mirror during transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the movable mirror is rotated quickly to increase consecutive shooting speed, then the shooting speed is improved, but mirror vibration occurs causing image blur
Solution Approach 1:
The shock dispersion surface is provided on the mirror holder to beforehand cushion the shock when the movable mirror rotates. This surface disperses the impact force generated during mirror rotation, preventing excessive vibration before it can affect image quality, thereby enabling faster mirror rotation without causing image blur
2Measurement precision
If the sub-mirror vibration is not quickly settled, then ranging performance is maintained, but consecutive shooting speed is reduced
Solution Approach 1:
The shock dispersion surface cushiones the shock beforehand during mirror rotation, which quickly settles sub-mirror vibration. This allows ranging to be performed quickly while maintaining measurement precision, and enables faster consecutive shooting by reducing the time the mirror needs to settle
Data Source
AI summary
A mirror driving device includes a positioner in the imaging apparatus; a mirror holder configured to hold the movable mirror and move to the first position and the second position of the movable mirror; a positioning surface at the mirror holder and configured to come into contact with the positioner to determine the first position of the movable mirror; and a shock dispersion surface provided at the mirror holder. When moving from the second position toward the first position, the movable mirror is configured to contact the positioner before the positioning surface comes into contact with the positioner to reduce a shock. The shock dispersion surface has a smaller inclination with respect to a travel-direction tangent line than an inclination of the positioning surface with respect to the tangent line. The shock dispersion surface is located forward of the positioning surface in the travel direction toward the first position.