Diaphragm actuator and its magnetic position sensing structure and setting method

Abstract

A light ring actuator is prepared as forming magnetism position sensing unit by a magnetism component and magnetism sensing component being set opposite to said magnetic component, driving magnetism component or magnetism sensing component to make space and included angle between two said components be changed simultaneously for obtaining linear relation of magnetic flux system induced by magnetism sensing component to position of magnetism component by mutual compensation, connecting light shading component to driving unit.

Description

technical field [0001] The present invention relates to a magnetic position sensing structure and its setting method, in particular to a magnetic position sensing structure applied to an aperture actuator and its setting method. Background technique [0002] With the advancement of technology, the demand for image capture and image processing is increasing. Traditionally, the lens aperture (iris diaphragm) using magnets and magnetic position sensors converts the magnetic flux induced by the magnetic position sensor into a voltage output signal. Due to the structure Improper setting makes it impossible to have a linear relationship between the magnetic flux (or voltage) and the position of the magnet, so a non-linear drive device and method are required, which will result in a complex structure and increased cost; if multiple magnets are installed, they will compensate each other. The magnetic flux induced by the magnetic position sensor is adjusted to a linear relationship a...

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Problems solved by technology

[0005] like Figure 3A and Figure 3B As shown, it is a traditional magnetic position sensing structure using two magnets 11 and a Hall sensor (Hall sensor) 12. When the Hall sensor 12 advances along the moving direction, the relationship between the magnetic flux density and the distance d is better than that of the previous embodiment It is linear, but it needs to increase the setting magnet, so the structure is complicated and the cost is increased

[0006] like Figure 4A and Figure 4B As shown, it is a traditional magnetic position sensing structure using four magnets 11 and a Hall sensor (Hallsensor) 12. When the Hall sensor 12 advances along the moving direction, the relationship between the magnetic flux density and the distance d is better than that of the previous embodiment. It is linear, but it still needs to add setting magnets, so the structure is complicated and the cost is increased

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