Camera Sensor Substrate Layout for Compact Low-Power Autofocus
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Solution Overview
Problem
Existing camera modules face challenges in reducing the size of sensor driving devices and minimizing power consumption, particularly for autofocus and image stabilization functions.
Innovation Solution
The proposed solution involves a sensor driving device with a unique substrate configuration, including a first substrate and a second substrate with protrusion parts and pad parts, which allows for a compact design and efficient electrical connection, thereby reducing size and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional substrate configurations are used in sensor driving devices, then electrical connection and structural support are maintained, but the device size remains large and power consumption is high
Solution Approach 1:
The second substrate is disposed on the first substrate in a nested configuration, with the protrusion part extending into the first substrate's space. This nesting approach allows the electrical connection structure to utilize the vertical space between substrates, reducing the overall device volume while maintaining reliable electrical connections through the pad part positioned at the tip of the protrusion part.
Solution Approach 2:
The protrusion part extends in a direction from the second substrate toward the first substrate, utilizing the vertical dimension (Z-axis) rather than only horizontal expansion. This dimensional transition allows electrical connections to be established in the vertical space, reducing the device's footprint area while maintaining connection reliability.
2Use of energy by moving object
If conventional substrate configurations are used in sensor driving devices, then structural support is maintained, but power consumption remains high
Solution Approach 1:
The substrate system is segmented into a first substrate and a second substrate with distinct functional regions. The second substrate includes a body part for structural support and a protrusion part for electrical connection, separating these functions spatially. This segmentation allows optimization of each part's material and structure, reducing overall power consumption while managing complexity through functional division.
Solution Approach 2:
The second substrate exhibits local quality differentiation: the body part provides structural support with one set of properties, while the protrusion part provides electrical connection with different properties (conductive pad at the tip). This local differentiation optimizes each region for its specific function, reducing power consumption in non-critical areas while maintaining connection reliability where needed.
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 enables a reduction in the size of the sensor driving device and decreases power consumption, leading to a more compact and energy-efficient camera module.
Implementation Method 1
a first driving unit disposed on the second substrate and a second driving unit corresponding to the first driving unit
Data Source
AI summary
A sensor driving device includes a first substrate; a second substrate disposed on the first substrate; and an image sensor. The second substrate includes a body having first and second lateral surfaces; a first protrusion part protruding from the first lateral surface; and a second protrusion part protruding from the second lateral surface. The first protrusion part includes a first extension part, and a second extension part extending in a direction different from the first extension part. The second protrusion part includes a first extension part, and a second extension part extending in a direction different from the first extension part. The first extension parts are disposed parallel to an optical axis of the image sensor. The second extension part of the first protrusion part is closer to the second extension part of the second protrusion part than to the first extension part of the second protrusion part.