Knowledge Base - What is a Laser Scan Engine

Home »
Knowledge Base »
FAQ »
What is a Laser Scan Engine
Cannot Log in Quality Complaint Some Parts Are Missing Shipment Payment Orders US Shipping Place quick order Vehicle Computer Basics How to Use Handheld Computer in Medical Care Touch Screen Basics Vehicle Computer Features Monitor Power Board Basics The Classification of Barcode Scanner How to Use Handheld Computer in Power Inspection How to Choose a Handheld Computer How to Choose an Industrial PDA What is a Handheld Computer IBS Points How to Select Car Power Adapter Chargers Vehicle Computer Detection Method How to Choose a Barcode Scanner for Supermarket How to Repair Vehicle Computer How to Choose a Barcode Scanner for Warehouse FAQs about Vehicle Computer Barcode Scanner Test Process Car Power Adapter Charger How Do LCD Screens Work The Difference Between The Mid-Range and High-End What If the Barcode Scanner is Unrecognizable Industrial Vehicle Computer Wearable Computer Basics Wearable Computer Applications Wearable Computer Application in Agriculture Honeywell Orbit MS7120 Barcode Scanner How to Set up Automatic Wrap for Motorola DS4208 Motorola Symbol DS9808 Barcode Scanner Symbol MC9200/MC92N0 Mobile Handheld Computer Zebra ZM400 Barcode Printer Zebra MZ220 Mobile Barcode Printer Motorola Symbol MC45 Handheld Mobile Computer MC3300 Handheld Mobile Computer MC9500-K Handheld Mobile Computer Symbol VC5090 Vehicle Mounted Computer Symbol MC9090-G Handheld Mobile Computer Symbol DS6708 Barcode Scanner Troubleshooting How to Identify the Symbol Barcode Scanner Model Symbol LS4208 Barcode Scanner Troubleshooting Symbol LS4278 Barcode Scanner Troubleshooting MS7120 Orbit Barcode Scanner Troubleshooting How to Choose Motorola Symbol Barcode Scanners Motorola Symbol DS6707 Barcode Scanner Symbol LS9203 Laser Barcode Scanner Installation How to Use Barcode Scanner in Production Symbol MC75A0 Handheld Mobile Computer Symbol MC65/MC659B Handheld Mobile Computer MC36 Handheld Mobile Computer MC1000 Handheld Mobile Computer How to Use Motorola Symbol DS9808 QR Code Scanner Honeywell MS7580 QR Code Scanner Troubleshooting Why Need a Special Printer for Printing Labels Motorola MC55A0 Series Handheld Mobile Computer What is a Barcode Scanner What is a Barcode Printer How to Clean a Printer Head Troubleshooting Common Barcode Printer How Do Touch Screens Work Motorola MC32N0 Handheld Computer What are Vehicle Computers Technical Requirements Prospect of PDA in Medical Industry Motorola LS7708 Scanning Platform Troubleshooting Motorola LS4208 Barcode Scanner Buzzer Definition Industrial and Commercial Barcode Scanner How Does Motorola LS4278 Scanner Match the Cradle Motorola LS9208 Hands Free Barcode Scanner Choosing a Barcode Scanner for Production Line Motorola MC3100 Handheld Mobile Computer Motorola WT4000 Wearable Compter Zebra TC8000/TC80N0 Handheld Mobile Computer Motorola Symbol RS409 Ring Scanner Motorola Symbol MC9090-G Handheld Mobile Computer Zebra 105SL Troubleshooting Motorola Symbol MC9000 Handheld Mobile Computer Motorola Symbol MC40 Handheld Mobile Computer Motorola Symbol MC50 Handheld Mobile Computer Motorola Symbol WT4090 Wearable Computer Honeywell Dolphin 9900 Mobile Computer Honeywell Dolphin 7600 Mobile Computer Honeywell Dolphin 7800 Mobile Computer Zebra TC55 Touch Mobile Computer Motorola Symbol MC3190 Handheld Mobile Computer Motorola Symbol MC92N0-G Troubleshooting Motorola Symbol RS507 Ring Scanner Intermec CK3 Handheld Mobile Computer How to Maintain Motorola Symbol MC70 Motorola Symbol MC32N0 Operating Instructions Motorola Symbol MC9190/MC92N0 Warm/Cold Boot Zebra ZM400 Printer Calibration Symbol MC92N0 Battery Management Symbol MC3300 VS. Symbol MC32N0 Zebra ZM400 Troubleshooting Zebra Barcode Printers Classifications Symbol SE955 Laser Scan Engine Setting by SSI Symbol VC5090 Vehicle Computer Troubleshooting How to Clean Boot for Intermec 70 Series What is an 18650 Battery What are the18650 Advantages and Disadvantages What is a Battery Protection Board What is the Role of the Battery Protection Board Zebra ZM400 Barcode Printer Maintenance Motorola Symbol LS4278 Wireless Barcode Scanner Symbol MC92N0 and Zebra DS3678 Connection Method Symbol MC92N0 Handheld Computer Troubleshooting How to Save the CE System Settings after Cold Boot FAQs about Symbol Barcode Scanners How to Re-burn the Symbol MC9000 Operating System How to Configure the Symbol MC9190 Wireless Networ Quality Issues Others

Knowledge Base

Need More Help?

The laser scan engine is the heart of the optical drive and is the most sophisticated part. It is mainly responsible for reading data.

Laser scan engine mainly include laser generators (also called laser diodes), semi-reflecting prisms, objective lenses, lenses, and photodiodes. When the laser scan engine reads the data on the disc, the reflective material on the disc will reflect the irradiated light back through the objective lens and then illuminate the semi-reflective prism. At this time, because the prism is a semi-reflective structure, it does not allow the light beam to completely penetrate it and return to the laser generator, but it reflects, passes through the lens, and reaches the photodiode. Since the data is recorded with raised points of the optical disc surface, the reflected light will be directed in a different direction. People define signals in different directions as "0" or "1". Light-emitting diodes receive data that are arranged with "0" and "1" and eventually resolve them into the data we need.

During the entire process of reading the data by the laser scan engine, tracking and focusing directly affect the error correction capability and stability of the optical drive. Tracing is that the laser scan engine keeps properly aligned with the recorded data track. When the laser beam exactly coincides with the track, the tracking error signal is 0, otherwise the tracking signal may be positive or negative, and the laser scan engine will appropriately adjust the attitude according to the tracking signal. If the optical drive's tracking performance is poor, reading data errors will occur when reading the disk. The most typical is the phenomenon of skipping when reading audio tracks. The so-called focusing means that the laser scan engine can precisely hit the beam onto the disc and receive the strongest signal. When the laser beam is reflected from the disk, it will hit 4 photodiodes at the same time. They superimpose signals and eventually form a focused signal. Only when the focus is accurate, this signal is 0, otherwise it will send a signal to correct the position of the laser scan engine. Focusing and tracking are the two most important performances of the laser scan engine. What we call a well-read disk drive is an excellent product in these two aspects.

Frequently Asked Questions