Lens Driving Module Sensor Layout for Compact Autofocus Stability
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Solution Overview
Problem
Existing camera modules face challenges in miniaturization and power efficiency, particularly in applying voice coil motor technology to subminiature, low-power camera modules, and struggle with light flaring due to side surface incidence.
Innovation Solution
A lens moving apparatus with a novel configuration that includes a base, circuit board, bobbin, coils, magnets, and sensors, allowing for increased support member length without height increase, improved reliability, and reduced power consumption, while also blocking side light to prevent flaring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the support member length is increased to improve reliability, then the height of the camera module increases
Solution Approach 1:
The support member is configured to extend in the radial direction (horizontal dimension) rather than increasing height (vertical dimension). This dimensional shift allows the support member to provide structural stability and reliability without increasing the overall height of the camera module, effectively resolving the contradiction between reliability and height constraints.
2Volume of moving object
If voice coil motor technology is applied to miniaturize the camera module, then power consumption increases
Solution Approach 1:
The patent replaces the traditional voice coil motor (electromagnetic actuation) with a piezoelectric actuator that utilizes piezoelectric effect. This substitution enables miniaturization of the camera module while reducing power consumption, as piezoelectric actuators are more energy-efficient for small-scale applications compared to voice coil motors.
3Device complexity
If the filter structure is simplified to reduce device complexity, then light flaring occurs due to side surface incidence
Solution Approach 1:
A light blocking structure is introduced as an intermediary element between the filter and the incoming light. This structure selectively blocks oblique light from entering through the side surface of the filter while allowing normal light transmission, thereby preventing flaring without requiring complex filter modifications.
4Measurement precision
If multiple sensors are added to improve measurement precision, then device complexity increases
Solution Approach 1:
Multiple sensing functions (position detection and other measurements) are integrated into a single sensor module. This merging approach maintains high measurement precision by incorporating multiple sensing capabilities while reducing device complexity by eliminating the need for separate sensor components and their associated circuitry.
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
Enhances the reliability and power efficiency of camera modules by enabling longer support members without height increase and minimizes light flaring, leading to improved image quality and reduced contamination spots.
Implementation Method 1
a first coil disposed on the bobbin... a magnet disposed on the housing... the first coil may be coupled to the first and second elastic members
Implementation Method 2
a second coil disposed between the base and the magnet... the second coil may include a first coil unit corresponding to the first magnet and a second coil unit corresponding to the second magnet
Implementation Method 3
each of the first and second sensors is a driver IC (Integrated Circuit) including a Hall sensor and a driver
Data Source
AI summary
An embodiment includes: a base; a circuit board which is disposed on the base and which includes first and second terminals; a housing disposed on the circuit board; a bobbin disposed in the housing; a first coil disposed on the bobbin; a sensing magnet disposed on the bobbin; a magnet disposed in the housing; a first position sensor which is disposed in the housing and which corresponds to the sensing magnet; a second coil disposed between the base and the magnet; and a second position sensor which is disposed on the circuit board and which includes a first sensor and a second sensor, wherein each of the first sensor and the second sensor is a driver integrated circuit including a hall sensor and a driver, a clock signal is provided to the first terminal of the circuit board, a data signal is provided to the second terminal of the circuit board, and the driver of each of the first position sensor, the first sensor, and the second sensor transmits/receives the clock signal through the first terminal of the circuit board, and transmits/receives the data signal in a time-division manner through the second terminal of the circuit board.