SLR Camera Mirror Drive Mechanism Shock Absorption
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Solution Overview
Problem
Existing SLR camera mechanisms for suppressing movable mirror bouncing are complex and interfere with the positioning accuracy of the main and sub-mirrors, particularly when both mirrors need to be stabilized during rotation.
Innovation Solution
A drive mechanism with shock-absorbing members supported by biasers, allowing the main and sub-mirrors to rotate without interference, using a combination of shock-absorbing members that come into contact with the mirrors to absorb shocks during rotation, ensuring precise positioning without influencing the mirrors' accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mirror bounce-suppressing mechanism is provided for each of the main mirror and sub-mirror, then bouncing of both mirrors can be suppressed, but the structure becomes more complicated
Solution Approach 1:
The patent combines the bounce suppression functions for both the main mirror and sub-mirror into a single integrated mechanism. The first shock-absorbing member suppresses bounce of the main mirror while simultaneously controlling the position of the second shock-absorbing member, which suppresses bounce of the sub-mirror. This merging approach achieves reliable bounce suppression for both mirrors without requiring separate independent mechanisms, thereby reducing structural complexity.
Solution Approach 2:
The first shock-absorbing member serves multiple functions: it directly suppresses bounce of the main mirror and simultaneously acts as a positioning mechanism for the second shock-absorbing member. This multi-functionality reduces the total number of components needed in the system while maintaining effective bounce suppression for both mirrors.
2Reliability
If shock-absorbing members are positioned to contact the mirrors during rotation, then bouncing is suppressed, but positioning accuracy may be influenced
Solution Approach 1:
The shock-absorbing members are designed to dynamically engage and disengage based on the operational state. During mirror rotation, the shock-absorbing members are positioned to contact the mirrors to suppress bounce. When the mirrors reach their target positions, the shock-absorbing members are retracted or disengaged to avoid interfering with positioning accuracy. This dynamic behavior allows the system to adapt its support characteristics to different operational phases.
Solution Approach 2:
The shock-absorbing members are positioned in advance during the rotation process to suppress bounce before the mirrors reach their final positions. By providing preliminary bounce suppression during the motion phase and then disengaging before positioning, the system ensures stable mirror operation without compromising final positioning accuracy.
3Productivity
If the movable mirror is required to rotate quickly for continuous shooting, then shooting performance improves, but mirror bounce becomes more severe
Solution Approach 1:
The shock-absorbing members are positioned in advance to provide cushioning support during mirror rotation. The first shock-absorbing member is held in a standby position by a biasing force, ready to contact and suppress bounce of the main mirror. Similarly, the second shock-absorbing member is positioned to suppress bounce of the sub-mirror. This beforehand cushioning allows rapid mirror rotation for continuous shooting while maintaining mirror stability through pre-positioned shock absorption.
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
The mechanism effectively suppresses bouncing of both the main and sub-mirrors, maintaining high positioning accuracy and simplifying the structure by reducing the number of components, thus enhancing the camera's performance and usability.
Implementation Method 1
a first shock-absorbing member which is held in a first shock-absorbing stand-by position by a first biaser, the first shock-absorbing member coming into contact with the main-mirror support member and being pressed and moved thereby against a biasing force of the first biaser
Implementation Method 2
to absorb shock of the main-mirror support member when the main-mirror support member rotates from the retracted position to the viewfinder light-guiding position
Data Source
AI summary
A camera movable-mirror drive mechanism includes a first shock-absorbing member, pushed by a main-mirror support member to absorb shock when the main-mirror support member rotates to a viewfinder light-guiding position; a second shock-absorbing member, pushed by the main-mirror support member when the main-mirror support member rotates to the retracted position; and a third shock-absorbing member, pushed by a sub-mirror support member to absorb shock when the sub-mirror support member rotates to a jutting position with rotation of the main-mirror support member to the viewfinder light-guiding position. When the main-mirror support member and the sub-mirror support member are in the viewfinder light-guiding position and the jutting-out position, respectively, the first shock-absorbing member is held by the second shock-absorbing member and does not contact the main-mirror support member and the third shock-absorbing member is held by the first shock-absorbing member and does not contact the sub-mirror support member.