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With you understand fingerprint sensor

Time:【2014-10-18】 Browse【2575】times

Simply speaking, the fingerprint sensor is mainly divided into two categories, optical fingerprint sensor and semiconductor fingerprint sensor;

Optical Fingerprint Sensor:

Mainly using light reflected off the subject and principles, fired from the bottom of the prism light and emitted through a prism, the light emitted from the surface of the finger fingerprint lined uneven refraction angle and light shade will be reflected back is not the same. CMOS or CCD optics will collect pictures of different degrees of light and shade information to complete fingerprint acquisition.

Semiconductor fingerprint sensor:

These sensors, either capacitive or inductive, is similar to the principle of integration in a semiconductor device with thousands "flat" on the fingers attached thereto on which constitute the capacitance (inductance) of the other side, due to the finger plane uneven, bumps and depressions at the point of contact with the plate of the actual distance is not the same size, the capacitor formed / inductance values are not the same, the equipment will be collected in accordance with this principle of different numerical summary, will be done fingerprint acquisition.

Fingerprint products, fingerprint sensors and fingerprint algorithm is the key. Because the process of processing the fingerprint image is a fingerprint, and the fingerprint image is processed, so the possibility of introducing into a clear fingerprint image is critical fingerprint processing, the fingerprint sensor is a fingerprint image capture section, and therefore, the performance of the fingerprint sensor will directly affect the the performance of fingerprint products.

A、Requirements for fingerprint sensor

Fingerprint application in the bank system, the selected fingerprint sensor generally has the following basic requirements:

A, a fingerprint sensor having a fingerprint identification in vivo, i.e., a fingerprint sensor has the ability to identify a non-human finger fingerprints, fingerprints, rubber fingers, etc.;

B, has a good adaptability to different types of fingers, such as the applicability of dry fingers, wet fingers, dirty fingers and the like. Because the characteristics of the bank is more female operator, therefore, requires a fingerprint sensor having a higher capture resolution; 
C, the sensor´s anti-static indicators. Because generally only semiconductor fingerprint sensor with fingerprint identification in vivo function, and semiconductor fingerprint sensor affected by the production process, susceptible to electrostatic shock. Thus, the general requirements for semiconductor fingerprint sensor has a strong anti-static capabilities. At present, the mainstream semiconductor fingerprint sensor antistatic indicators generally reach 15KV; 
D, life requirements. Life requires that the sensor can be used in general to reach one million times.

B、Performance comparison of different types of fingerprint sensors and analysis

Currently fingerprint sensor uses from the classification is divided into semiconductor fingerprint sensor and an optical fingerprint sensor.

Optical fingerprint sensor nearly 30 years of history, its principle is the principle of photographic and optical reflection, there are domestic manufacturers can produce optical fingerprint sensor, the advantage of a strong anti-static capability, low product cost, long life, but with fingerprint identification is not possible in vivo, defects and poor applicability of dry and wet fingers.

Semiconductor fingerprint sensor is mainlyThe use of capacitors, electric field (ie what we call inductive), the principle of temperature and pressure to achieve fingerprint image acquisition. At present, virtually no domestic manufacturers of semiconductor fingerprint sensor capability, mainly imported from abroad.Semiconductor fingerprint sensor has divided planar strip fingerprint sensor and a fingerprint sensor (ie, slide-type fingerprint sensor / scratch fingerprint sensor).

A、Capacitive fingerprint sensor introduction

Capacitive fingerprint sensor is the mainstream semiconductor fingerprint sensor market.

Capacitive fingerprint sensor was first used by the US Veridicom company´s FPS100 fingerprint sensor. However, FPS100 fingerprint sensor is relatively low due to static indicators (only 5KV), the presence of the fingerprint residue problems, basically there is no scale applications.

(A)、MBF200 solid state capacitive sensor

Fujitsu MBF200 (MBF200 SOLID-STATE FINGERPRINT SENSOR, Chinese name: MBF200 solid state fingerprint sensor) Solid-state capacitance sensor is Japan´s Fujitsu companies use purchased from Veridicom´s capacitive fingerprint sensor technology, technical improvements, the launch of a capacitive fingerprint sensor . Which fingerprint sensor is Japan´s Fujitsu company launched in 2002, after the product launch, in some fingerprint product has been applied. 
Product Overview

Product manufacturer Fujitsu 
Model MBF-200 
Acquisition capacitive principle, the direct detection method 
Technical Parameters Resolution 508DPI 
Dot-matrix 256 × 300 
Single Image Size (bytes) 76K 
Acquisition window size 24 × 24mm 
Antistatic index ± 10 kV 
Operating temperature -20 ° C to + 85 ° C 
Unpublished Service life 
Humidity Unpublished 
Adaptability is generally dry finger 
Wet fingers poor adaptability

Product evaluation MBF-200 capacitive fingerprint sensor is the use of Fujitsu´s semiconductor technology development Veridicom fingerprint sensor, the fingerprint sensor in 2002 after the market gradually, and by some manufacturers use fingerprint products, but did not form scale applications. 
Its advantages are: high acquisition resolution. 
The disadvantages are: static indicators of low fingerprint sensor (only 10KV, currently general requirement is 15KV); wet finger on the fingerprint sensor adaptability in general, especially for wet fingers (or hand cream finger) applicability difference . In addition, manufacturers do not disclose information on Service life the sensor.

Technically MBF-200, the Fujitsu company has launched a SPF 200-USB Fingerprint Sensor and scratch-off of MBF has a USB interface 310 - Solid-State Fingerprint Sweep Sensor. 
In addition to Fujitsu´s capacitive fingerprint sensors, fingerprint sensor manufacturers in recent years, consistent commitment to technology improvements and technology upgrades for the capacitive fingerprint sensor, which are more representative also interested STMicroelectronics (ST Micro) and Sweden FingerPrint Card the company.

(B)、FPC1011C capacitive fingerprint sensor introduction

FPC1011C capacitive fingerprint sensor is a Swedish FingerPrint Card Company (Sweden a formula company) introduced the most advanced capacitive fingerprint sensor.
Capacitive fingerprint sensor which utilizes the company´s patented reflective detection technology (conventional capacitive fingerprint sensor is generally used in direct detection technology), the surface protective layer thickness can reach ordinary fingerprint sensor capacitive fingerprint sensor about 100 times, thus making the fingerprint sensor has a higher wet finger on the applicability and longer life. 
Key performance indicators FingerPrint Card Fingerprint Sensor in the table below:

Product Overview 
Manufacturers Sweden FingerPrint Card Companies 
Model FPC1011C 
Acquisition principle of capacitive, reflective detection method 
Detecting the position of the dermis 
Technical Parameters Resolution 363DPI 
Dot-matrix 152 × 200 
Single Image Size (bytes) 30K 
Acquisition window size 15 × 12mm 
Antistatic index ± 15 kV 
Operating temperature -20 ° C to + 85 ° C 
Service life one million times 
Humidity 95% 
Good adaptability dry finger 
Good wet fingers adaptability

Product Evaluation & nbsp; FPC1011C capacitive fingerprint sensor is a Swedish FingerPrintCard companies use its patented technology to detect the development of reflective semiconductor fingerprint sensor, the fingerprint sensor on the market in 2003 after being recognized and adopted many manufacturers, has now formed large-scale applications.

Features fingerprint sensor which is: Because of its unique detection technology that can detect the dermis, with good applicability to wet a finger, the surface material thickness sensor reaches about 100 times that of other capacitive fingerprint sensor with good durability. Antistatic indicators have reached 15KV.

B、Inductive fingerprint sensor introduction

The main production inductive fingerprint sensor manufacturers AuthenTec, the United States, it has a patented inductive technology fingerprint sensor (TurePrint technology). Currently, AuthenTec company The & nbsp; FingerLoc & nbsp; Family and The & nbsp; EntréPad & nbsp; Family two series of a variety of fingerprint sensor.

More domestic use are mainly AF-S2, AES3400 and AES2500 series (including: AES2501 and AES2510). Which, AF-S2 is AuthenTec´s fingerprint sensors launched the first generation, AES2500 fingerprint sensor series is scratch. AuthenTec AES3400 is a new generation of fingerprint sensors, due to its acquisition window is relatively small, generally less suitable for use in general-purpose devices, more and more use on PDA and other special equipment.


Key performance indicators AuthenTec´s fingerprint sensors in the table below.

AuthenTec´s fingerprint sensor AF-S2 Performance Table

Product Overview

Manufacturers AuthenTec´s America

Product Type AF-S2

Acquisition Principle Inductive

Technical Parameters Resolution 250DPI

Dot number 128×128

Single image size (in bytes) 16K

Acquisition window size 14.5×14.5mm

Antistatic index ±8 kV

Operating Temperature 0°C to +70°C

Service life Unpublished

Humidity unpublished

Adaptability is generally dry finger

Wet fingers poor adaptability

Product Evaluation & nbsp; AF-S2 & nbsp; inductive fingerprint sensor is AuthenTec´s use of its patented technology TurePrint technology introduced the first generation of semiconductor fingerprint sensor, the fingerprint sensor in 2002 was the mainstream market fingerprint sensors, and more generally for 2001 - development of fingerprint products manufacturers use during 2002. The last 2 years, due to a better performance of the new fingerprint sensor put on the market in recent years, manufacturers developed a new fingerprint fingerprint products no longer in use.

Features fingerprint sensor which is: There is large-scale application, the sensor performance is relatively stable.

The disadvantages are: sensor resolution is low, only 250DPI, for some of the finer finger fingerprint lines (such as women) effect will be affected, in addition, anti-static indicators of low fingerprint sensor (only 8KV, currently general requirement is 15KV) ; wet finger on the fingerprint sensor adaptability in general, especially on wet fingers (or hand cream finger) applicability poor. In addition, manufacturers do not disclose information on the life of the sensor.

AuthenTec´s AES3400 Fingerprint Sensor Performance Table

Product Overview

Manufacturers AuthenTec´s America

Product Type AES3400

Acquisition Principle Inductive

Technical Parameters Resolution 500DPI

Dot number 128×128

Single image size (in bytes) 16K

Acquisition window size 7.2 × 7.2mm

Antistatic index ±8 kV

Operating Temperature 0°C to +70°C

Life 1 million times

Humidity unpublished

Adaptability is generally dry finger

Wet fingers adaptability general

Product Evaluation & nbsp; AES3400 & nbsp; inductive AuthenTec´s fingerprint sensor is the use of its patented technology TurePrint technical development of a new generation of semiconductor fingerprint sensor performance than the AF-S2 have some improvement.

Features fingerprint sensor which is: There is large-scale application, the sensor performance is relatively stable, acquisition resolution of 500DPI.

The disadvantages are: acquisition window area is small, only 7.2 × 7.2mm. Antistatic index fingerprint sensor is low (only 8KV, currently general requirement is 15KV); wet finger on the fingerprint sensor adaptability in general.

C、cratch fingerprint sensor introduction

Scratch fingerprint sensor imaging method is: When a finger on the fingerprint sensor scratch, collecting multiple images and then stitching images collected, eventually forming the entire fingerprint image. So, scratch fingerprint sensor can capture a fingerprint image large areas of the finger. However, the effect of the acquisition of the image will be the use of personnel moving finger speed Scratch fingerprint sensor imaging method is: When a finger on the fingerprint sensor scratch, collecting multiple images and then stitching images collected, eventually forming the entire fingerprint image So, scratch fingerprint sensor. can capture a fingerprint image large areas of the finger. However, the effect is affected by the acquisition of the image using the person moves the finger velocity. impact.

Scratch fingerprint sensor imaging method is: When a finger on the fingerprint sensor scratch, collecting multiple images and then stitching images collected, eventually forming the entire fingerprint image. So, scratch fingerprint sensor can capture a fingerprint image large areas of the finger. However, the effect is affected by the acquisition of the image using the person moves the finger velocity.

Scratch fingerprint sensor only for the following applications:

A、The relatively small size of handheld devices, such as mobile phones, PDA, etc., on these devices, fingerprint sensor surface can not be used because of the volume;

B、Operating time using less demanding applications. General surface fingerprint sensor as long as your finger to the hand set, the operator easy to master. For scratch fingerprint sensor, scratch due to operating characteristics, usually in high demand on the time of the occasion should not be used. When used in a PDA or portable computer, if a validation fails, the operator can repeat the verification because the application is not strictly limited to the operation time. The scratch-off requires the operator to compare carefully scraped fingers and scratching speeds have more stringent requirements, such as banks for a higher speed of operation of the teller counter and demanding situations, it is difficult to ensure that each teller and more seriously scraping fingers.

C、Operating time using less demanding applications. General surface fingerprint sensor as long as your finger to the hand set, the operator easy to master. For scratch fingerprint sensor, scratch due to operating characteristics, usually in high demand on the time of the occasion should not be used. When used in a PDA or portable computer, if a validation fails, the operator can repeat the verification because the application is not strictly limited to the operation time. The scratch-off requires the operator to compare carefully scraped fingers and scratching speeds have more stringent requirements, such as banks for a higher speed of operation of the teller counter and demanding situations, it is difficult to ensure that each teller and more seriously scraping fingers.

In general, the choice of semiconductor fingerprint sensor is mainly to consider the following indicators:

A, antistatic properties, generally require more than 15kv, otherwise susceptible to breakdown;

B、Resolution. Generally require at least 256dpi, otherwise it is not easy to distinguish fine fingerprints, such as banks, hospitals, supermarkets, etc. should not be applied

C、Suitability for wet fingers (especially hand cream coated fingers). AuthenTec, Fujitsu MBF200 and so there are different degrees of impairment.

D、Life requirements. Life requires that the sensor can be used in general to reach one million times.

E、Product consistency and adaptability, due to China´s vast territory, people in different regions have different characteristics fingerprints, so you should select the country have applied to verify the product is generally used.

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