Magnetic Sensor Chip Layout with Cutout for Terminal Electrodes
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Solution Overview
Problem
Sensor chips have difficulty securely fixing magnetic blocks due to their small size, leading to unstable support and increased size requirements to accommodate terminal electrodes around the magnetic block.
Innovation Solution
A magnetic sensor design where the sensor chip and magnetic block are mounted on a circuit board in a laid-down posture, with a cutout portion in the magnetic block allowing terminal electrodes to be placed within the cutout, reducing the need for distributed electrode arrangements and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the magnetic block is placed on the element formation surface of the sensor chip, then magnetic flux concentration is achieved, but secure fixation is difficult due to the small size of the sensor chip
Solution Approach 1:
The patent transitions from placing the magnetic block vertically on top of the sensor chip to mounting both the sensor chip and magnetic block in a laid-down posture on a circuit board. This dimensional reconfiguration provides a larger base area for fixation, resolving the contradiction between achieving magnetic flux concentration and ensuring secure fixation on a small sensor chip.
2Measurement precision
If the magnetic block is elongated in the perpendicular direction to concentrate magnetic flux, then magnetic detection sensitivity is improved, but the magnetic block becomes unstable and may detach or bend
Solution Approach 1:
The patent reorients the magnetic block from a vertical elongated structure to a horizontal laid-down structure on the circuit board. This dimensional change maintains the magnetic flux concentration capability while significantly improving structural stability and preventing detachment or bending.
3Ease of manufacture
If terminal electrodes are arranged to avoid the magnetic block, then proper electrical connections are achieved, but the sensor chip size increases
Solution Approach 1:
The patent extracts the terminal electrodes from the element formation surface area and relocates them to the circuit board in the laid-down configuration. This separation allows the sensor chip to maintain a compact size while terminal electrodes are properly arranged on the circuit board to avoid interference with the magnetic block.
4Area of stationary object
If the sensor chip size is reduced, then miniaturization is achieved, but the magnetic block cannot be easily placed and fixed on the chip
Solution Approach 1:
The patent resolves this contradiction by abandoning the vertical placement approach and adopting a laid-down mounting approach on a circuit board. This provides ample space for both the miniaturized sensor chip and the magnetic block to be properly placed and fixed, eliminating the manufacturing difficulties associated with placing magnetic blocks on small vertical chip surfaces.
Data Source
AI summary
To provide a magnetic sensor capable of supporting a magnetic block stably and allowing a further size reduction of the sensor chip. A magnetic sensor includes a sensor chip and a magnetic block which are mounted on a circuit board. The sensor chip is mounted on the circuit board such that a mounted surface thereof faces a mounting surface, and the magnetic block is mounted on the circuit board such that first and second surfaces and face an element formation surface and the mounting surface, respectively. The magnetic block has a cutout portion, and some of terminal electrodes E11 to E16 are disposed within a space formed by the cutout portion. According to the present invention, the magnetic block can be supported stably. In addition, the presence of the cutout portion in the magnetic block allows a further size reduction of the sensor chip.