Flexible printed circuit board magnetic micromirror for laser marking/engraving

Periyasamy, Karlmarx G K; Zuo, Haoyi; He, Siyuan

doi:10.1088/1361-6439/ab1fc1

Cited by 24 publications

(30 citation statements)

References 31 publications

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“…However, the second type needs to bond the mirror plate onto a released and fragile micro actuator, which is very difficult and then leads to a low bonding yield due to the low strain limit of the silicon flexible structure. In order to overcome this problem, flexible printed circuit board (FPCB) micromirrors were proposed and developed in [23,24,25,26] by the authors of the present paper, which have the mirror plate bonded to the FPCB structure. The flexible parts of FPCB structure are the polyimide layer or polyimide plus copper film laminate layer, which has a higher strain limit than silicon.…”

Section: Introductionmentioning

confidence: 99%

External Electromagnet FPCB Micromirror for Large Angle Laser Scanning

Periyasamy

Tan

et al. 2019

Micromachines

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An external electromagnet plus moving PM (permanent magnet) FPCB (flexible printed circuit board) micromirror is proposed in this paper that can overcome two limitations associated with the previous FPCB micromirror with a configuration of an external PM plus moving coil, i.e., (1) it reduces the overall width beyond the mirror plate, and (2) increases the maximum rotation angle. The micromirror has two external electromagnets underneath an FPCB structure (two torsion beams and a middle seat) with two moving PM discs attached to the back and a metal-coated mirror plate bonded to the front of the FPCB middle seat. Modeling and simulation were introduced, and the prototype was fabricated and tested to verify the design. The achieved performance was better than that of the previous design: a maximum resonant rotation angle of 62° (optical) at a driving voltage of ±3 V with a frequency of 191 Hz, the required extra width beyond the mirror plate was 6 mm, and an aperture of 8 mm × 5.5 mm with a roughness of <10 nm and a flatness of >10 m (ROC, radius of curvature). The previous FPCB micromirror’s performance was: strain limited maximum rotation angle was 40° (optical), the extra width beyond the mirror plate was 14.7 mm, and had an aperture of 4 mm × 4 mm with a similar roughness and flatness.

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Section: Introductionmentioning

confidence: 99%

External Electromagnet FPCB Micromirror for Large Angle Laser Scanning

Periyasamy

Tan

et al. 2019

Micromachines

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“…The compensation micromirror rotates the angle of the same magnitude and same direction of the translation micromirror's tilt. In the experiment, a translation micromirror, 6 a 1D Lorenz force magnetic rotation micromirror, 36 and a reflecting mirror form the compensation system. And its performance in a Michelson interferometer is tested.…”

Section: Resultsmentioning

confidence: 99%

“…The compensation system includes a one-dimensional (1D) compensation micromirror M2 36 and a reflecting mirror M3 to correct the tilt of the translation mirror M1. The tilting of M1 follows a constant and fixed manner, that is, tilting about one fixed axis, and the tilt versus the translation/driving current has a constant/fixed relation which can be calibrated.…”

Section: Working Principlementioning

confidence: 99%

“…Michelson interferometer with the tilt compensation system is shown in Figure 4(a), which includes a laser (\5 mW, 532 nm), a beam splitter, a fixed mirror, and the tilt compensation system. The compensation system consists of Lorentz force rotation mirror M2 36 and a reflecting mirror M3. Large rotation and reflecting mirrors are used in the experiment, for example, 1 in in diameter, for easy observation and adjustment, but both of them can be replaced by much smaller mirrors.…”

Section: Platform Setupmentioning

confidence: 99%

“…M2 is driven by the Lorentz force applied on the flexible printed circuit board (FPCB) micromirror. 36 The Lorentz force is generated by two permanent magnets on the side when the current passes through the magnetic field, as shown in Figure 4(d). M1 is placed on a rotation stage, which is mounted on a two-dimensional (2D) linear stage, thus M1 can be rotated in Y-axis and moved in the XY plane.…”

Section: Platform Setupmentioning

confidence: 99%

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A tilt compensation system for translation micromirror

2018

Advances in Mechanical Engineering

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A tilt compensation system is presented in this article to compensate the tilt in the translation micromirror used in miniaturized Fourier transform infrared spectrometers. This compensation system can not only be used for the micromirror tested in this article but also be applicable to any translation micromirror with undesired tilt about one fixed axis. The compensation system consists of only a compensation micromirror and a reflecting mirror. The compensation micromirror rotates an angle of the same magnitude and same direction as the translation micromirror's tilt. The compensation micromirror has its rotation axis parallel to the tilting axis of the translation micromirror, which is identified using a position sensing detector-based setup introduced in the article. Experimental results show the tilt of the translation micromirror can be compensated to 0.026°from the original tilt of 0.24°.

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Direct Laser Writing of Graphene‐Based Electrical Interconnects for Printed Circuit Board Repair

Lim

Sandeep

Murukeshan

et al. 2021

Adv Materials Technologies

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Malfunctions in printed circuit boards (PCBs) are often caused by damaged copper traces. Printing materials such as metal nanoparticles, conductive polymers, and graphene along with novel printing methods are being actively explored for repairing the conductive connections in PCBs. Because of its high‐resolution capability, direct writing of conductive traces gets significant attention, especially with the widespread use of flexible PCBs. Graphene is an ideal material for such applications due to its excellent electrical and mechanical properties. However, there have been limited reports on graphene‐based methods for the facile fabrication of conductive traces. A novel method of femtosecond laser direct writing of graphene traces by the photoreduction of graphene oxide (GO) to conductive reduced GO (rGO) for repair and modification of legacy PCBs is reported. A trace‐width resolution of 28.4 μm is achieved over a large patterning area of 100 mm × 100 mm. The rGO thickness is found to be tunable from 0.6 to 4.4 μm, while the sheet resistance is minimized to 100 Ω sq−1. The system capability is demonstrated by printing conductive traces on top of a flexible substrate to form a closed path for turning on a light‐emitting diode, as well as, by repairing a commercial PCB.

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Flexible printed circuit board magnetic micromirror for laser marking/engraving

Abstract: Recently, there is increasing interest in laser marking/ engraving of consumer goods, such as jewelry, nameplates, wallets and belts, cell phone cases, clothing, etc. These applications need a small laser working area (1-2 inches on each

Cited by 24 publications

References 31 publications

External Electromagnet FPCB Micromirror for Large Angle Laser Scanning

External Electromagnet FPCB Micromirror for Large Angle Laser Scanning

A tilt compensation system for translation micromirror

Direct Laser Writing of Graphene‐Based Electrical Interconnects for Printed Circuit Board Repair

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