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Laser Sensing PCB: Revolutionizing Precision and Efficiency

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Item Flexible pcb Rigid-Flexible pcb Rigid PCB
Max Layer 8L 36L 60L
Inner Layer Min Trace/Space 3/3mil 3/3mil 3/3mil
Out Layer Min Trace/Space 3.5/4mil 3.5/4mil 3/3mil
Inner Layer Max Copper 2oz 6oz 6oz
Out Layer Max Copper 2oz 3oz 6oz
Min Mechanical Drilling 0.1mm 0.15mm 0.15mm
Min Laser Drilling 0.1mm 0.1mm 0.1mm
Aspect Ratio(Mechanical Drilling) 10:1 12:1 20:1
Aspect Ratio(Laser Drilling) / 1:1 1:1
Press Fit Hole Ttolerance ±0.05mm ±0.05mm ±0.05mm
PTH Tolerance ±0.075mm ±0.075mm ±0.075mm
NPTH Tolerance ±0.05mm ±0.05mm ±0.05mm
Countersink Tolerance ±0.15mm ±0.15mm ±0.15mm
Board Thickness 0.1-0.5mm ±0.1mm 0.4-8mm
Board Thickness Tolerance(<1.0mm) ±0.05mm ±0.1mm ±0.1mm
Board Thickness Tolerance(≥1.0mm) / ±10% ±10%
Impedance Tolerance Single-Ended:±5Ω(≤50Ω),±10%(>50Ω) Single-Ended:±5Ω(≤50Ω),±10%(>50Ω) Single-Ended:±5Ω(≤50Ω),±7%(>50Ω)
Differential:±5Ω(≤50Ω),±10%(>50Ω) Differential:±5Ω(≤50Ω),±10%(>50Ω) Differential:±5Ω(≤50Ω),±7%(>50Ω)
Min Board Size 5*10mm 10*10mm 10*10mm
Max Board Size 9*14inch 22.5*30inch 22.5*30inch
Contour Tolerance ±0.05mm ±0.1mm ±0.1mm
Min BGA 7mil 7mil 7mil
Min SMT 7*10mil 7*10mil 7*10mil
Surface Treatment ENIG,Gold Finger,Immersion Silver,Immersion Tin,HASL(LF),OSP,ENEPIG,Flash Gold;Hard gold plating ENIG,Gold Finger,Immersion Silver,Immersion Tin,HASL(LF),OSP,ENEPIG,Flash Gold;Hard gold plating ENIG,Gold Finger,Immersion Silver,Immersion Tin,HASL(LF),OSP,ENEPIG,Flash Gold;Hard gold plating
Solder Mask Green Solder Mask/Black PI/Yellow PI Green Solder Mask/Black PI/Yellow PI Green,Black,Blue,Red,Matt Green
Min Solder Mask Clearance 3mil 1.5mil 1.5mil
Min Solder Mask Dam 8mil 3mil 3mil
Legend White,Black,Red,Yellow White,Black,Red,Yellow White,Black,Red,Yellow
Min Legend Width/Height 4/23mil 4/23mil 4/23mil
Strain Fillet Width 1.5±0.5mm 1.5±0.5mm /
Bow & Twist / 0.05% 0.3%
Table of Contents
Primary Item (H2)

Integrating laser sensors into printed circuit boards (PCBs) has opened up a new frontier of possibilities in electronics. Laser-sensing PCBs are becoming increasingly popular in various applications, from industrial automation to consumer electronics, due to their precision, reliability, and versatility. This article delves into the world of laser-sensing PCBs, exploring their workings, benefits, and diverse applications.

What is a Laser Sensing PCB?

A laser-sensing PCB incorporates laser sensors directly onto a printed circuit board, enabling the detection, measurement, and analysis of various parameters with high precision. These sensors use a focused beam of light to detect an object's presence, absence, or distance, making them ideal for a wide range of applications.

How Do Laser Sensors Work?

Laser sensors on PCBs work by emitting a laser beam toward an object and then measuring the time it takes for the light to bounce back to the sensor. This time-of-flight measurement allows for accurate distance calculations. Some laser sensors also measure the change in wavelength of the reflected light, enabling them to detect the speed of moving objects.

Advantages of Laser Sensing PCBs

  • High Precision: Laser sensors provide highly accurate measurements, making them ideal for applications where precision is critical.
  • Versatility: They can be used across many environments, including those with high levels of ambient light, dust, or moisture, where traditional sensors might fail.
  • Speed: Laser sensors can capture measurements at high speeds, allowing real-time monitoring and control in dynamic environments.
  • Compact Design: Integrating these sensors onto a PCB minimizes the device's overall footprint, enabling their use in compact and portable devices.

Types of Laser-Sensing PCBs

  • Time-of-Flight (ToF) Sensors: These measure the time it takes for a laser to return to the sensor after reflecting off an object, providing distance measurements.
  • Laser Triangulation Sensors: By analyzing the angle at which the laser beam returns to the sensor, these can determine the distance to an object with high accuracy.
  • Laser Doppler Sensors: Used for measuring the speed of an object, these sensors detect changes in the frequency of the reflected laser light.

Applications of Laser Sensing PCBs

The precision and versatility of Laser Sensing PCBs have led to their adoption in a myriad of applications:

  • Industrial Automation: For precise positioning, quality control, and machine calibration.
  • Automotive: Used in advanced driver-assistance systems (ADAS) for object detection, distance measurement, and collision avoidance.
  • Consumer Electronics: In devices like smartphones and cameras for autofocus mechanisms and gesture recognition.
  • Healthcare: For patient monitoring equipment and advanced diagnostic tools that require precise measurements.

Choosing the Right Laser Sensor for Your PCB

Selecting the appropriate laser sensor for integration into a PCB requires consideration of several factors, including the measurement range, accuracy requirements, environmental conditions, and power consumption. It's also crucial to ensure compatibility with the PCB design and the overall device architecture.


Laser Sensing PCBs are transforming how we interact with the world around us, providing the eyes for the next generation of smart devices. As technology continues to evolve, the potential applications for these sensors are only limited by our imagination. Whether it's in improving the safety features of autonomous vehicles or enabling new user interfaces in consumer electronics, Laser Sensing PCBs are set to play a pivotal role in the future of technology.

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