Hard circuit board of flat oscillating motor

Abstract

The invention provides a hard circuit board of a flat type motor, which includes: epoxy layer, conducting layer, insulation layer, carbon film resistive layer; said carbon film resistive layer highness is greater than the hard circuit board thickness. Because carbon film resistive layer is designed located in same side of the flat type vibrating motor rotor coil, and is in middle of oscillator opposite and two coils, carbon film resistive layer highness is not limited by the hard circuit board, carbon film resistance with low resistance value can be used and manufacturing technique difficulty is reduced, is favorable for stability and large-scale production.

Description

Technical field [0001] The invention relates to a hard circuit board, in particular to a hard circuit board with a flat vibrating motor anti-electromagnetic interference. Background technique [0002] The miniaturization and ultra-thinning of mobile phones is an inevitable trend of market development, which is a severe challenge for mobile phone parts manufacturers; especially the vibration motors used for reminder functions on mobile phones, such as the current flat vibration motors of mobile phones The minimum thickness has reached only 2 mm, and each part is measured in microns, and the hard circuit board (also called H-PCB) in the flat motor is the first to suffer. [0003] As shown in Figure 1, this flat vibrating motor includes: a lower casing; a central shaft on the lower casing, a flexible circuit board, electric brushes, and magnetic steel. Comprised of the above parts is the stator assembly (204) known as the flat motor. Rotatable with respect to these fixed stat...

AI Technical Summary

Problems solved by technology

[0022] However, no matter how these three solutions are improved, one fact cannot be avoided: in fact, the thickness of the carbon film resistor (101B) will not exceed 0.08mm

[0023] Printing carbon film resistors (101B) not only needs to adjust the formula of the paste, but also strictly control the printing area and thickness of the paste, because the carbon film resistors (101B) with a thickness of 0.08 mm have a resistance The value should be controlled within 300 to 500 ohms, which is not suitable for general resistance carbon film resistors (101B). It should be a high resistance carbon film resistor (101B), and the disadvantages of high carbon film resistors (101B) It is: changing the value of any parameter (such as: printed area, thickness, drying temperature, drying time) even if it is very small, will cause a great change in the final resistance value

This will lead to a large number of defective products

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