Optical Unit Shake Correction Reflective Smooth Layer
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Solution Overview
Problem
Existing optical units with shake correcting functions face challenges in achieving accurate displacement monitoring and correction due to issues with photo reflector placement, leading to potential malfunctions and increased costs from required smooth surfaces, especially when using the space between the movable and fixed bodies.
Innovation Solution
An optical unit design that incorporates photo reflectors on the side faces of the movable and fixed bodies with superposed reflective smooth layers, ensuring accurate output correlation with swing angles and minimizing the impact of scratches, while being integrated into the shake correction drive mechanism to maintain optical axis alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If photo reflectors are arranged by utilizing side faces of movable body and fixed body, then space utilization is improved and compact size is achieved, but the output correlation with swing angle deteriorates due to scratches and surface irregularities
Solution Approach 1:
A reflective smooth layer is introduced as an intermediary between the photo reflector and the side face surface. This smooth layer acts as a mediator that provides a scratch-free reflective surface, allowing the photo reflector to maintain accurate output correlation even when the underlying side face has scratches or irregularities. The smooth layer decouples the measurement function from the surface quality requirements of the host structure.
Solution Approach 2:
The reflective smooth layer is applied locally only in the region facing the photo reflector, rather than the entire side face. This localized application provides the necessary smooth reflective surface exactly where needed for measurement accuracy, while leaving other areas unchanged. The local quality improvement targets the specific functional requirement of the photo reflector interface.
2Measurement precision
If photo reflectors are disposed at projected portions or around the lens, then measurement function is improved, but device complexity and space requirements worsen
Solution Approach 1:
The side faces of the movable body and fixed body serve multiple functions: they provide structural boundaries for the optical unit, and simultaneously serve as mounting surfaces for the photo reflectors. This multi-functionality eliminates the need for separate dedicated photo reflector mounting structures, reducing overall device complexity while maintaining measurement precision.
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 design enables precise monitoring and correction of shake-induced displacements with high accuracy, reducing the risk of malfunctions and costs associated with surface smoothness, while maintaining a compact optical unit size.
Implementation Method 1
a photo reflector which monitors a displacement amount of the movable body
Implementation Method 2
a first reflective smooth layer which is superposed on the other of the first side faces in a region facing the first photo reflector
Data Source
AI summary
The purpose of the present invention is to provide an optical unit with a shake correction function such that even when a photo reflector is provided by using a gap between a side surface of a movable body and a side surface of a fixed body, an appropriate relationship between an output from the photo reflector and the rock angle of the movable body can be obtained. In an optical unit (100) with a shake correction function, a movable body (3) is rocked about a rock fulcrum (180) by a driving mechanism (500) for shake correction, and thereby shaking is corrected. At that point, the movement of the movable body (3) is monitored by providing a first photo reflector (580a) and a second photo reflector (580b) on side surfaces of a fixed body (200). Here, a smooth layer (590) such as a resin tape, a metal sheet, a coating layer, plate glass or a reflective board is laminated onto side surfaces of the movable body (3) at a region facing the first photo reflector (580a) and a region facing the second photo reflector (580b).