Yuav ua li cas yog Multilayer PCB?

Multilayer PCB tau txhais tias yog PCB ua los ntawm peb lossis ntau txheej ntawm cov ntawv ci tooj liab. Lawv zoo li txheej txheej ntawm ob tog sib tshooj ntawm lub rooj sib tham, laminated thiab glued ua ke, nrog ntau txheej txheej rwb thaiv tsev ntawm lawv. The entire structure is arranged so that two layers are placed on the surface side of the PCB to connect to the environment. All electrical connections between layers are made through holes such as electroplated through holes, blind holes and buried holes. Cov txheej txheem no tuaj yeem siv tau los tsim cov PCBS nyuaj ntawm ntau qhov sib txawv.

Why are multilayer PCBS so widely used

Multilayer PCBS came into being in response to the ever-changing changes in the electronics industry. Over time, the functions of electronic devices have become increasingly complex, requiring more complex PCBS. Hmoov tsis zoo, PCBS raug txwv los ntawm cov teeb meem xws li suab nrov, tsis muaj peev xwm ua tau, thiab kev sib tsoo, yog li qee qhov kev tsim qauv yuav tsum tau ua raws. These design considerations made it difficult to obtain satisfactory performance from single-sided or even double-sided PCBS – hence the birth of multi-layer PCBS.

Kev ntim lub zog ntawm ob txheej PCBS rau hauv hom ntawv no tsuas yog ib feem ntawm qhov loj me, thiab ntau txheej PCBS tau dhau los ua neeg nyiam hauv cov khoom siv hluav taws xob. They come in a variety of sizes and thicknesses to meet the needs of their extended applications, with variations ranging from 4 to 12 layers. The number of layers is usually even because odd layers can cause problems in the circuit, such as warping, and are not cost-effective to produce. Most applications require four to eight layers, but applications such as mobile devices and smartphones tend to use around 12 layers, while some specialist PCB manufacturers have the capacity to produce close to 100 layers. Txawm li cas los xij, ntau txheej PCBS nrog ntau txheej yog qhov tsawg vim tias lawv muaj txiaj ntsig zoo.

Why are multilayer PCBS so widely used

Thaum ntau lub PCBS zoo li yuav kim dua thiab siv zog rau kev tsim khoom, lawv tau dhau los ua ib feem tseem ceeb ntawm cov thev naus laus zis niaj hnub no. This is mainly due to the many benefits they offer, especially when compared with single – and double-decker varieties.

Cov txiaj ntsig ntawm multilayer PCBS

Los ntawm cov txheej txheem kev pom, ntau txheej PCBS muaj ntau qhov zoo hauv kev tsim. These advantages of multilayer PCB include:

• Small size: One of the most prominent and acclaimed benefits of using multi-layer printed circuit boards is their size. Vim tias lawv cov txheej txheem tsim, ntau lub PCBS yog lawv tus kheej me dua li lwm lub PCBS nrog kev ua haujlwm zoo sib xws. This has brought huge benefits to modern electronics as the current trend is towards smaller, more compact but more powerful gadgets such as smartphones, laptops, tablets and wearables.

• Kev tsim kho kom hnyav: PCBS me me tau siv rau qhov hnyav dua, tshwj xeeb tshaj yog vim muaj ntau qhov txuas uas xav tau rau kev sib txuas sib txuas ib leeg-thiab ob txheej PCBS raug tshem tawm hauv kev nyiam tsim ntau txheej. Ib zaug ntxiv, qhov no ua rau hauv txhais tes ntawm cov khoom siv hluav taws xob niaj hnub no, uas zoo li muaj ntau lub xov tooj.

• Ua tau zoo: Cov hom PCBS no zoo dua li ib txheej thiab ob txheej PCBS vim qhov ua haujlwm ntau thiab cov phiaj xwm uas yuav tsum tau ua thaum tsim ntau txheej PCBS. Raws li qhov tshwm sim, lawv kuj tseem ntseeg tau ntau dua.

• Improved durability: Multi-layer PCBS tend to last longer due to their nature. Cov multilayer PCBS no yuav tsum tsis yog tsuas yog ua rau lawv tus kheej hnyav, tab sis kuj tuaj yeem tswj hwm qhov kub thiab siab uas siv los ua kua nplaum ua ke. In addition to these factors, multilayer PCBS use multiple layers of insulation between circuit layers, combining them with prepreg adhesives and protective materials.

• Ua kom yooj yim dua: Txawm hais tias qhov no tsis siv rau txhua lub PCB sib xyaw ua ke, qee qhov siv cov txheej txheem tsim kho tau yooj yim, ua rau muaj kev hloov pauv ntau lub PCBS. Qhov no tej zaum yuav zoo tagnrho rau cov ntawv thov uas khoov me ntsis thiab khoov tau tuaj yeem tshwm sim ib nrab ntu. Ib zaug ntxiv, qhov no tsis siv rau txhua tus PCBS ntau tus, thiab ntau txheej koj ntxiv rau PCB hloov pauv tau, PCB hloov pauv tau yooj yim dua.

• Muaj zog dua: Multilayer PCBS yog cov khoom sib xyaw ua kom siab ntau uas sib xyaw ua ke ntau txheej rau hauv SINGLE PCB. Cov kev nyob ze no ua rau cov laug cam txuas nrog ntau dua, thiab lawv cov khoom hluav taws xob muaj peev xwm tso cai rau lawv kom ua tiav lub peev xwm thiab nrawm dua txawm tias me dua.

• Ib qho kev sib txuas ib qho: Ntau txheej PCBS tau tsim los siv ua ib chav nyob ntau dua li hauv lwm cov khoom PCB. Raws li qhov tshwm sim, lawv muaj ib lub ntsiab lus sib txuas, ntau dua li kev sib txuas sib txuas uas yuav tsum tau siv ntau txheej ib txheej PCBS. This turns out to be beneficial in electronic product design as well, since they only need to include a single connection point in the final product. Qhov no muaj txiaj ntsig tshwj xeeb rau cov khoom siv hluav taws xob me me thiab cov cuab yeej tsim los kom txo qhov loj me thiab hnyav.

These advantages make multilayer PCBS useful in a variety of applications, especially mobile devices and high-function electronics. Nyob rau hauv lem, raws li ntau qhov kev lag luam txav mus rau kev daws teeb meem hauv xov tooj, ntau txheej PCBS tab tom nrhiav chaw nyob hauv cov lej ntawm kev thov tshwj xeeb hauv kev lag luam.

Why are multilayer PCBS so widely used

Disadvantages of multilayer PCBS

Multi-layer PCB has many advantages and is suitable for various advanced technologies. Txawm li cas los xij, hom PCBS no tsis haum rau txhua daim ntawv thov. In fact, several disadvantages may outweigh the advantages of multilayer PCBS, especially for electronics with lower cost and complexity. Cov kev tsis zoo no suav nrog:

• Higher cost: Multi-layer PCBS are much more expensive than single-and double-layer PCBS at every stage of the manufacturing process. They are difficult to design and take a lot of time to solve any potential problems. Lawv kuj xav tau cov txheej txheem kev tsim khoom nyuaj los tsim, uas yuav tsum siv sijhawm ntau thiab ua haujlwm rau kev sib sau ua ke. Ib qho ntxiv, vim yog qhov xwm txheej ntawm PCBS no, ib qho yuam kev ua thaum tsim khoom lossis sib dhos yog qhov nyuaj heev rau rov ua haujlwm, ua rau cov nqi zog ntxiv lossis cov nqi seem. Ntxiv rau qhov ntawd, cov cuab yeej siv los tsim ntau lub PCBS yog kim heev vim tias nws tseem yog cov thev naus laus zis tshiab. For all these reasons, unless small size is an absolute necessity for an application, a cheaper alternative may be a better choice.

• Kev tsim khoom nyuaj: Ntau txheej PCBS nyuaj rau tsim ntau dua li lwm hom PCB, xav tau ntau lub sijhawm tsim thiab ua tib zoo tsim cov txheej txheem. Qhov ntawd vim tias txawm tias muaj qhov tsis zoo me me hauv PCB tsim lossis tsim khoom tuaj yeem ua rau nws tsis muaj txiaj ntsig.

• Limited availability: One of the biggest problems with multi-layer PCBS is the machines needed to produce them. Tsis yog txhua lub tuam txhab tsim khoom PCB muaj qhov uas xav tau lossis xav tau rau lub tshuab, yog li tsis yog txhua lub tuam txhab PCB nqa nws. Qhov no txwv tus naj npawb ntawm PCB cov tuam txhab uas tuaj yeem siv los tsim ntau txheej PCBS rau cov neeg siv khoom. Yog li ntawd, nws raug nquahu kom ua tib zoo nug txog PCB lub chaw tsim khoom lub peev xwm hauv ntau txheej PCBS ua ntej txiav txim siab PCB tus tsim khoom raws li daim ntawv cog lus tsim khoom.

• Tus kws tsim txuj ci xav tau: Raws li tau hais ua ntej, ntau txheej PCBS xav tau ntau qhov kev tsim ua ntej. Yog tsis muaj kev paub dhau los, qhov no tuaj yeem muaj teeb meem. Cov laug cam ntau tus neeg xav tau kev sib txuas ntawm cov khaubncaws sab nraud povtseg, tabsis yuav tsum tau ua ib txhij txo cov kev sib tshuam thiab cov teeb meem cuam tshuam.Ib qho teeb meem hauv kev tsim qauv tuaj yeem ua rau lub rooj tsavxwm tsis ua haujlwm zoo.

• Production time: As complexity increases, so do manufacturing requirements. Qhov no ua lub luag haujlwm tseem ceeb hauv kev hloov pauv ntawm ntau txheej PCBS-txhua pawg thawj coj siv sijhawm ntau los tsim, ua rau muaj nqi zog ntau dua. Ib qho ntxiv, nws tuaj yeem ua rau ncua sijhawm ntev dua ntawm kev tso xaj thiab tau txais cov khoom lag luam, uas tuaj yeem muaj teeb meem hauv qee kis.

Txawm li cas los xij, cov teeb meem no tsis tau ploj mus los ntawm kev ua haujlwm ntawm ntau txheej PCBS. Thaum lawv zoo li raug nqi ntau dua li ib txheej PCBS, ntau txheej PCBS muaj ntau qhov zoo dua li hom ntawv luam tawm Circuit Board.

Qhov zoo ntawm ntau txheej PCBS hla ib txheej kev xaiv

The advantages of multi-layer PCBS over single-layer alternatives become even more obvious. Some of the key improvements that multilayer PCBS provide include:

• Higher assembly density: While the density of single-layer PCBS is limited by their surface area, multi-layer PCBS multiply their density by layering. Dua li ntawm PCB qhov me me, qhov nce hauv qhov ua rau ua haujlwm tau zoo dua, ua kom muaj peev xwm thiab nrawm dua.

• Smaller size: Overall, multi-layer PCBS are smaller than single-layer PCBS. Thaum ib leeg-txheej PCBS yuav tsum ua kom thaj tsam ib puag ncig ntawm qhov ua kom loj dua, ntau txheej PCBS ua rau thaj tsam ntxiv los ntawm kev ntxiv txheej, yog li txo qhov loj me. Qhov no tso cai muaj peev xwm ntau dua PCBS siv rau hauv cov cuab yeej me dua, qhov muaj peev xwm siab dua ib txheej PCBS yuav tsum tau teeb tsa hauv cov khoom loj.

• Lub cev hnyav dua: Kev sib xyaw ua ke hauv ntau txheej PCBS txhais tau tias tsis xav tau cov khoom sib txuas thiab lwm yam khoom ntxiv, muab kev daws teeb meem rau kev siv hluav taws xob nyuaj. Multi-layer PCBS can accomplish the same amount of work as multiple single-layer PCBS, but with a smaller size, fewer connected components, and reduced weight. Qhov no yog qhov kev txiav txim siab tseem ceeb rau cov khoom siv hluav taws xob me me uas qhov hnyav yog qhov txhawj xeeb.

• Enhanced design features: Overall, multi-layer PCBS can outperform average single-layer PCBS. Los ntawm kev sib txuas ntau tus yam ntxwv tiv thaiv kev tiv thaiv, siab dua EMI tiv thaiv thiab txhim kho kev tsim qauv zoo, ntau txheej PCBS tuaj yeem ua tiav ntau dua, txawm tias me dua thiab sib dua.

Why are multilayer PCBS so widely used

Yog li, cov xwm txheej no txhais li cas thaum txiav txim siab txog ntau txheej thiab ib txheej txheej? Essentially, if you want to produce small, lightweight and complex equipment where quality is critical, multi-layer PCBS may be your best choice. However, if size and weight are not major factors in product design, single – or double-layer PCB designs may be more cost-effective.