Optical Element Drive Sensor Mounting in a Recessed Fixing Part
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Solution Overview
Problem
Existing optical element driving apparatuses face challenges in improving the attaching accuracy of movable part detection magnetic sensors while avoiding an increase in apparatus size, particularly due to the influence of molding accuracy and fitting precision of the Hall element.
Innovation Solution
The apparatus includes a magnetic sensor mounted on a magnetic sensor substrate housed in a recess of a fixing part, with the magnetic sensor substrate being separately disposed to enhance attaching accuracy without increasing the overall size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the Hall element is directly fit into the recess of the fixing part without being mounted on the substrate, then the apparatus size can be reduced, but the Hall element attaching accuracy is affected by molding accuracy and fitting precision
Solution Approach 1:
The patent introduces a substrate as an intermediary component between the Hall element and the fixing part. The substrate serves as a mounting platform that allows the Hall element to be accurately positioned and attached, while the substrate itself is designed to fit into the recess of the fixing part. This intermediary structure separates the functions of mechanical support and electrical connection, enabling improved attaching accuracy without significantly increasing the overall apparatus size.
Solution Approach 2:
The patent segments the magnetic sensor system into multiple components: the Hall element, the substrate, and the fixing part with recess. By dividing the system into these separate functional modules, each component can be optimized independently. The substrate can be precisely manufactured with appropriate tolerances for Hall element mounting, while the fixing part recess is designed to accommodate the substrate assembly, thereby achieving high attaching accuracy without requiring the entire apparatus to be oversized.
2Manufacturing precision
If the Hall element is mounted on the substrate, then the attaching accuracy can be improved, but the apparatus size increases
Solution Approach 1:
The patent employs a nested structure where the Hall element is mounted on the substrate, and the substrate assembly is then housed within the recess of the fixing part. This nesting arrangement allows the substrate and Hall element to be accommodated within the existing spatial envelope of the fixing part, minimizing the increase in apparatus size while still providing a stable mounting platform for the Hall element, thereby achieving improved attaching accuracy.
3Volume of moving object
If the Hall element is fit into a small recess, then the apparatus size is reduced, but it becomes difficult to confirm the mounting state and connection state
Solution Approach 1:
The substrate acts as an intermediary that provides accessible surfaces and structures for verifying the mounting state. The top surface of the substrate, which is exposed after assembly, can include visual indicators, alignment marks, or access points that allow operators to confirm proper installation of the Hall element and electrical connections without disassembling the compact housing or accessing the interior of the small recess.
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 improves the attaching accuracy of movable part detection magnetic sensors while effectively managing the size of the optical element driving apparatus.
Implementation Method 1
a magnetic sensor configured to detect a position of the movable part based on a relative position with respect to the magnet
Implementation Method 2
the coil and the magnet being configured to operate in conjunction with each other to move the movable part with respect to the fixing part
Data Source
AI summary
An optical element driving apparatus includes: a coil and a magnet separately disposed at a movable part configured to hold an optical element and a fixing part configured to support the movable part, the coil and the magnet being configured to operate in conjunction with each other to move the movable part with respect to the fixing part; and a magnetic sensor configured to detect a position of the movable part based on a relative position with respect to the magnet. The magnetic sensor is mounted on a magnetic sensor substrate, the magnetic sensor substrate is housed in a recess provided in the fixing part.