Optical Unit Shake Correction FPCB Routing
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Solution Overview
Problem
Existing optical units with image stabilization mechanisms face increased power consumption and size due to the need for higher driving forces to counteract reaction forces from flexible printed circuit boards during rolling correction, which interferes with the motion of the movable member.
Innovation Solution
A configuration where the flexible printed circuit board for the optical module includes a flexed part that is not drawn between the rotating holder and the fixed side, allowing the holder to rotate on the optical axis without encountering reaction forces, thereby reducing the need for increased power or larger driving mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flexible printed circuit board is drawn between the movable member and fixing member to connect the optical module, then the optical module can be electrically connected, but reaction force is generated during rolling correction that interferes with the motion of the movable member
Solution Approach 1:
The patent extracts the flexible printed circuit board from the path between the movable member and fixing member. Instead, the FPCB is routed to connect the optical module to the movable member, while a separate rigid circuit board connects the movable member to the fixing member. This separation removes the FPCB from generating reaction forces during rolling correction while maintaining electrical connectivity.
Solution Approach 2:
The patent divides the circuit board connection into two separate components: a flexible printed circuit board for connecting the optical module to the movable member, and a rigid circuit board for connecting the movable member to the fixing member. This segmentation allows the FPCB to be positioned away from the rolling correction path, eliminating reaction forces while preserving electrical connections.
2Reliability
If the driving force of the magnetic driving mechanism is increased to counteract reaction force from the flexible printed circuit board, then rolling correction can be maintained, but power consumption increases
Solution Approach 1:
By extracting the flexible printed circuit board from the rolling correction path, the patent eliminates the source of reaction forces. This allows the magnetic driving mechanism to operate without needing increased driving force, thereby maintaining rolling correction reliability while reducing power consumption to normal levels.
3Reliability
If the driving force of the magnetic driving mechanism is increased to counteract reaction force from the flexible printed circuit board, then rolling correction can be maintained, but the size of the optical unit increases
Solution Approach 1:
The patent removes the flexible printed circuit board from the rolling correction path, eliminating reaction forces. This allows the use of a compact magnetic driving mechanism without requiring oversized components, thereby maintaining rolling correction reliability while keeping the optical unit size compact.
4Reliability
If the flexible printed circuit board is drawn between the holder and fixing member, then electrical connection is established, but propping of the flexible printed circuit board occurs during rotation on the optical axis
Solution Approach 1:
The patent extracts the flexible printed circuit board from the rotation path by routing it to connect only the optical module to the movable member. A separate rigid circuit board handles the connection from the movable member to the fixing member. This eliminates propping during rotation while maintaining electrical connectivity.
Solution Approach 2:
The patent segments the electrical connection system into two parts: the FPCB connected to the rotating optical module, and a rigid circuit board connected to the non-rotating fixing member. This segmentation prevents the FPCB from being subjected to rotational stress and propping, ensuring smooth rotation while maintaining electrical connections.
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 minimizes power consumption and allows for downsizing of the optical unit by eliminating the need for enhanced power delivery or larger mechanisms to counteract reaction forces, while maintaining effective rolling correction.
Implementation Method 1
a magnetic driving mechanism for rolling configured to allow the movable member to rotate on the optical axis
Data Source
AI summary
An optical unit may include a movable member configured to hold an optical module; a rotation supporting mechanism to support the movable member such that the movable member rotates on an optical axis; a fixing member to support the movable member; a rolling magnetic driving mechanism to rotate the movable member on the optical axis; and an optical module flexible printed circuit board. The movable member may include a holder configured to rotate on the optical axis while holding the optical module. The holder may include a fixing part to which the optical module flexible printed circuit board is fixed. The optical module flexible printed circuit board may include a connector inserting part connected to the fixing member or to a supporting member; and a flexed part formed between the connector inserting part and a portion fixed to the fixing part.