In PCB dhizaini, kune nzvimbo dzakawanda dzinoda kufunga nezvekuchengetedza chinhambwe. Pano, yakakamurwa muzvikamu zviviri zvenguva iripo: imwe ndeyemagetsi ane chekuita nekuchengetedza mvumo, uye imwe yacho isiri yemagetsi-ine chekuita nekuchengetedza mvumo.

1. Magetsi ane chekuita nekuchengetedzwa kure
1. Kupatsanurana pakati pewaya

Nezvekugona kugadzirisa kwevagadziri vePCB vemazuva ese, nzvimbo shoma pakati pewaya haifanire kunge iri pasi pe4mil. Chinhambwe chemutsetse wemutsetse zvakare chinhambwe kubva pamutsara kuenda kumutsara uye mutsetse kuenda padhi. Kubva pakuona kwekugadzira, iyo yakakura zviri nani kana zvichibvira, iyo yakawanda inosvika 10mil.

2. Pad aperture uye pad width

Nezvekugona kwekugadzirisa kwevagadziri vePCB vemazuva ese, kana iyo pad aperture yakadhirowa nemichina, iyo shoma haifanirwe kunge iri pasi pe0.2mm, uye kana laser drilling ikashandiswa, iyo shoma haifanire kunge iri pasi pe4mil. Iyo aperture kushivirira kwakasiyana zvishoma zvichienderana nendiro, kazhinji inogona kudzorwa mukati me 0.05mm, uye hudiki padhi hupamhi haifanirwe kuve isingasviki 0.2mm.

3. Chinhambwe chiri pakati pepadhi nepadhi

Nezvekugona kwekugadzirisa kwevagadziri vePCB vemazuva ese, chinhambwe chiri pakati pemapadhi nemapadhi hachifanirwe kunge chiri pasi pe0.2mm.

4. Nharaunda pakati peganda remhangura uye kumucheto kwebhodhi

Nharaunda pakati peganda remhangura yakachajiswa uye kumucheto kwePCB board zviri nani kwete isingasviki 0.3mm. Seta iyo mirau yemirau pane iyo Dhizaini-Mitemo-Bhodhi rondedzero peji.

If it is a large area of ​​copper, it usually needs to be retracted from the edge of the board, generally set to 20mil. In the PCB design and manufacturing industry, under normal circumstances, due to the mechanical considerations of the finished circuit board, or to avoid curling or electrical short-circuiting due to the exposed copper skin on the edge of the board, engineers often spread copper on a large area The block is shrunk by 20 mils relative to the edge of the board, instead of spreading the copper to the edge of the board. There are many ways to deal with this kind of copper shrinkage, such as drawing a keepout layer on the edge of the board, and then setting the distance between the copper paving and the keepout. Here is a simple method to set different safety distances for copper paving objects. For example, the safety distance of the whole board is set to 10mil, and the copper paving is set to 20mil, and the effect of 20mil shrinkage of the board edge can be achieved. The dead copper that may appear in the device is removed.

2. Kusachengetedzwa kwekuchengetedzwa kwemagetsi
1. Hunhu hwakafara, hurefu uye nzvimbo

Iyo firimu firimu haigone kuchinjwa panguva yekugadziriswa, asi iyo mutsara mutsara wakafara weD-CODE isingasviki 0.22mm (8.66mil) yakakora kusvika 0.22mm, kureva, mutsara wemutsara L=0.22mm (8.66mil), uye hunhu hwese Hupamhi=W1.0mm, kureba kwehunhu hwese H=1.2mm, uye nzvimbo iri pakati pemavara D=0.2mm. Kana chinyorwa chiri chidiki pane chiyero chiri pamusoro, kugadzirisa uye kudhinda kuchadzima.

2. Kupatsanuka pakati peburi neburi (gomba kumucheto kusvika kumucheto)

Chinhambwe chiri pakati pe vias (VIA) ne vias (gomba kumucheto kusvika kumucheto) chinopfuura 8mil.

3. Chinhambwe kubva pasirikirini yesiriki kusvika padhi

Sirika sikirini haibvumidzwe kuvhara padhi. Nekuti kana sirika chidzitiro chakafukidzwa padhi, sirika chidzitiro hachizoiti tinned panguva tinning, izvo zvinokanganisa chikamu mounting. Kazhinji, fekitori yebhodhi inoda nzvimbo ye8mil kuti ichengetwe. Kana iyo nzvimbo yePCB yakaganhurwa chaizvo, 4mil pitch haigamuchirwe. Kana iyo sirika sikirini yakavhara padhi netsaona panguva yekugadzira, fekitori yebhodhi inongobvisa chikamu chesiriki chidzitiro chakasara padhi panguva yekugadzira kuti ive nechokwadi chekuti padhi yakanamirwa.

Zvechokwadi, mamiriro chaiwo anoongororwa zvakadzama panguva yekugadzira. Dzimwe nguva sirika chidzitiro chiri pedyo nemaune padhi, nokuti kana mapedhi maviri ari pedyo zvikuru, pakati sirika sikirini anogona zvinobudirira kudzivirira solder kubatana kubva pfupi-circuiting panguva soldering. Mamiriro ezvinhu aya ndeimwe nyaya.

4. 3D kureba uye yakatwasuka spacing pane mechanical chimiro

Paunenge uchiisa zvishandiso paPCB, funga kana paine kukakavara nemamwe makinika zvimiro munzira yakachinjika uye kureba kwenzvimbo. Naizvozvo, kana uchigadzira, zvinodikanwa kuti utarise zvizere kuchinjika pakati pezvikamu, iyo PCB chigadzirwa uye goko rechigadzirwa, uye chimiro chemuchadenga, uye kuchengetedza chinhambwe chakachengeteka kune chimwe nechimwe chinotarirwa kuti uone kuti hapana kupokana munzvimbo.