Compact Optical Move Apparatus with Orthogonal Guide Members
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Solution Overview
Problem
Existing optical shift apparatuses are bulky due to the need for a wide space to accommodate the coil and conductor, limiting their compactness and practicality in optical image stabilization systems.
Innovation Solution
A compact optical move apparatus is designed with a rotation restricting structure that includes a base member, drive coil, holding member, drive magnet, guide members, and a magnetic shield, where the guide members are positioned to avoid overlapping with the drive coil and magnet, allowing for movement in orthogonal directions while maintaining a compact form.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a coil and conductor are disposed on the movable side to enable optical element movement, then the optical element can be shifted in orthogonal directions, but the apparatus becomes larger due to the wide space required
Solution Approach 1:
The patent repositions the drive coil from the movable side to the fixed side, utilizing the spatial dimension along the optical axis to separate the coil and magnet positions. This dimensional rearrangement allows the movable side to be compact while maintaining full bidirectional movement capability through the electromagnetic drive mechanism.
Solution Approach 2:
The patent inverts the conventional arrangement by placing the drive coil on the fixed side and the magnet on the movable side, rather than the traditional configuration. This inversion resolves the space constraint issue while preserving the electromagnetic driving function for optical element movement.
2Stability of the object's composition
If guide members are added to restrict rotation of the optical element, then rotational stability is improved, but the device complexity increases
Solution Approach 1:
The guide members serve multiple functions simultaneously: they guide the linear movement of the optical element in orthogonal directions and concurrently restrict rotational movement. This multi-functionality achieves rotational stability without adding separate dedicated rotation restriction mechanisms, thereby limiting complexity increase.
Solution Approach 2:
The patent combines the guidance function and rotation restriction function into a single integrated guide member structure. By merging these functions, the system achieves rotational stability while minimizing the number of separate components and overall structural complexity.
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 solution enables a compact optical move apparatus that effectively reduces image blurs by allowing movement in two orthogonal directions without rotating, thereby enhancing the design freedom and compactness of optical systems like interchangeable lens units.
Implementation Method 1
a drive coil held by the base member, a drive magnet held by the holding member and serving as a move actuator configured to drive the holding member together with the drive coil in the first and second directions
Data Source
AI summary
An optical move apparatus includes a drive magnet held by a holding member and configured to drive the holding member together with a drive coil in first and second directions, a first guide member fixed to the holding member, a second guide member configured to guide the first guide member in the first direction, and a third guide member fixed to the base member and configured to guide the second guide member in the second direction on a side opposite to the first guide member in the optical axis direction. None of the first, second, and third guide members overlap the drive coil in the optical axis direction. The third guide member includes two bodies in a plane orthogonal to the optical axis direction. At least part of the third guide member is thinner than the drive coil in the optical axis direction.