Position detection device, aperture module and camera module
By calculating the voltage ratio by using the subtractor and adder of the Hall device, and combining the subtractive voltage change unit, the problem of Hall voltage changing due to temperature changes is solved, and the accuracy and linearity of the aperture module when detecting the magnet or aperture position is achieved.
CN113132590BActive Publication Date: 2025-03-28SAMSUNG ELECTRO MECHANICS CO LTD
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Patent Information
- Application Number
- CN202010618189.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Priority Date
- 2019-12-27
- Filing Date
- 2020-06-30
- Publication Date
- 2025-03-28
- Estimated Expiration
- 2040-06-30
AI Technical Summary
Technical Problem
The Hall voltage of the Hall device changes due to temperature changes, resulting in accuracy problems when the aperture module detects the magnet or aperture position.
Method used
Using a subtractor and adder combining the first Hall device and the second Hall device, by calculating the ratio of the addition voltage to the subtraction voltage, combined with the subtraction voltage change unit, the subtraction voltage is kept constant in the target point and the transition part to compensate for the Hall voltage change caused by the temperature change.
Benefits of technology
Effectively compensates for the impact of temperature changes on Hall voltage, ensuring the accuracy and linearity of the aperture module when detecting magnets or aperture positions.
✦ Generated by Eureka AI based on patent content.
Abstract
The present invention provides a position detection device, an aperture module and a camera module. The position detection device is used to detect the position of a magnet configured to move stepwise between a first target point and a second target point. The position detection device includes: a first Hall device configured to generate a first Hall voltage; a second Hall device configured to generate a second Hall voltage; a subtractor configured to generate a subtraction voltage based on a difference between the first Hall voltage and the second Hall voltage; an adder configured to generate an addition voltage based on a sum of the first Hall voltage and the second Hall voltage; a divider configured to calculate a ratio of the addition voltage to the subtraction voltage; and a subtraction voltage changing unit configured to keep the subtraction voltage at the first target point and the second target point and in a transition portion between the first target point and the second target point constant.
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