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Bayanin Fasaha na LED Mai Haske SMD 67-23/R6GHBHC-B05/2T - Girman Kunshin 6.0x3.2x1.9mm - Ƙarfin Wutar Lantarki 2.0-3.95V - Launuka Ja/Kore/Shuɗi - Takardun Fasaha na Hausa

Bayanin fasaha na LED mai haske SMD 67-23/R6GHBHC-B05/2T a cikin kunshin P-LCC-4. Yana da launuka masu haske ja (R6), kore (GH), da shuɗi (BH), kusurwar kallo digiri 120, kuma ya bi ka'idojin RoHS.
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Murfin Takardar PDF - Bayanin Fasaha na LED Mai Haske SMD 67-23/R6GHBHC-B05/2T - Girman Kunshin 6.0x3.2x1.9mm - Ƙarfin Wutar Lantarki 2.0-3.95V - Launuka Ja/Kore/Shuɗi - Takardun Fasaha na Hausa

1. Bayanin Samfurin Gabaɗaya

67-23/R6GHBHC-B05/2T na'urar LED ce da ake hawa a saman (SMD) a cikin kunshin P-LCC-4 tare da mai haske mai haɗaka. An ƙera wannan ɓangaren a matsayin mai nuna launuka da yawa, ana samunsa cikin launuka masu haske ja (R6), kore (GH), da shuɗi (BH). Kunshin yana da jikin farin gami tare da taga mai tsabta mara launi, wanda ke ƙara fitar da haske kuma yana ba da kyakkyawan kamanni. Samfurin ne mara gubar kuma ya bi ka'idojin RoHS, wanda ya sa ya dace da tarukan lantarki na zamani tare da ƙa'idodin muhalli.

Babban fa'idodin wannan LED sun haɗa da ƙaramin girman P-LCC-4, wanda ya dace da ƙirar PCB mai yawan taro, da kuma mai haske mai haɗaka wanda ke inganta ƙarfin haske da sarrafa kusurwar kallo. Manyan kasuwannin da ake nufi su ne kayan aikin sadarwa don nuna matsayi da hasken baya, na'urorin lantarki na masu amfani don hasken maɓalli da alamomi, hasken baya na LCD, da aikace-aikacen nuni na gabaɗaya inda ake buƙatar tushen haske mai aminci, mai haske, da tsaftataccen launi.

2. Zurfin Bincike na Ma'auni na Fasaha

2.1 Matsakaicin Matsakaicin Matsayi

Matsakaicin Matsakaicin Matsayi yana ayyana iyakokin damuwa wanda bayan su lalacewar dindindin na na'urar na iya faruwa. Ga dukkan nau'ikan launuka uku (R6, GH, BH), matsakaicin ci gaba na halin yanzu (IF) shine 25 mA, tare da izinin kololuwar halin yanzu (IFP) na 100 mA don aikin bugun jini. Matsakaicin ƙarfin lantarki na baya (VR) shine 5 V. Matsakaicin raguwar wutar lantarki (Pd) shine 120 mW don guntun ja da 110 mW don guntun kore da shuɗi, wanda yake da mahimmanci ga ƙirar sarrafa zafi. Na'urar na iya aiki a cikin kewayon zafin jiki na -40°C zuwa +85°C kuma a adana daga -40°C zuwa +90°C. An ƙayyade iyakokin zafin gishiri don sake kwarara (260°C na dakika 10 matsakaici) da gishiri na hannu (350°C na dakika 3 matsakaici).

2.2 Halayen Lantarki da Haske

Ana auna ma'auni na lantarki da haske a daidaitaccen yanayin gwaji na zafin yanayi 25°C da halin yanzu na 20 mA. Ƙarfin haske ya bambanta ta hanyar guntu da kwandon: Ja (R6) ya kewayo daga 112 zuwa 285 mcd, Kore (GH) daga 180 zuwa 715 mcd, da Shuɗi (BH) daga 72 zuwa 285 mcd. Duk guntayen suna raba matsakaicin kusurwar kallo (2θ1/2) na digiri 120. Matsakaicin tsayin raƙuman ruwa (λp) kusan 632 nm (ja), 518 nm (kore), da 468 nm (shuɗi). Matsakaicin tsayin raƙuman ruwa (λd) suna da ƙayyadaddun kewayon kowane launi. Ƙarfin lantarki na gaba (VF) yawanci 2.0V (matsakaici 2.4V) don ja da 3.4V (matsakaici 3.95V) don guntun kore da shuɗi. Halin yanzu na baya (IR) a VR=5V shine 10 µA matsakaici don ja da 50 µA matsakaici don kore/shuɗi.

3. Bayanin Tsarin Rarraba

Samfurin yana amfani da tsarin rarraba don rarraba raka'a bisa mahimman ma'auni na haske da na lantarki, yana tabbatar da daidaito a cikin aikin aikace-aikace.

3.1 Rarraba Ƙarfin Haske

Ana rarraba ƙarfin haske zuwa takamaiman kwandon don kowane nau'in guntu, wanda aka ayyana a IF=20mA. Don guntun Ja (R6): Kwandon R (112-180 mcd) da Kwandon S (180-285 mcd). Don guntun Kore (GH): Kwandon S (180-285 mcd), Kwandon T (285-450 mcd), da Kwandon U (450-715 mcd). Don guntun Shuɗi (BH): Kwandon Q (72-112 mcd), Kwandon R (112-180 mcd), da Kwandon S (180-285 mcd). Ana amfani da juzu'i na ±11% akan ƙarfin haske.

3.2 Rarraba Matsakaicin Tsayin Raƙuman Ruwa

Hakanan ana rarraba matsakaicin tsayin raƙuman ruwa don sarrafa tsaftar launi. Don guntun Ja (R6): Kwandon FF1 (621-626 nm) da Kwandon FF2 (626-631 nm). Don guntun Kore (GH): Kwandon X (520-525 nm) da Kwandon Y (525-530 nm). Don guntun Shuɗi (BH): Kwandon X (465-470 nm) da Kwandon Y (470-475 nm). An ƙayyade juzu'i na ±1 nm don matsakaicin tsayin raƙuman ruwa. Ƙarfin lantarki na gaba yana da juzu'i na ±0.1V.

4. Bincike na Lanƙwasa Aiki

Bayanin yana ƙunshe da madaidaicin lanƙwasa halayen lantarki da haske don kowane nau'in guntu (R6, GH, BH). Duk da yake ba a ba da takamaiman bayanan hoto a cikin rubutun ba, waɗannan lanƙwasa yawanci suna nuna alaƙa tsakanin halin yanzu na gaba da ƙarfin haske, ƙarfin lantarki na gaba da halin yanzu na gaba, da tasirin zafin yanayi akan ƙarfin haske. Bincika irin waɗannan lanƙwasa yana da mahimmanci ga masu ƙira don fahimtar halayen LED a ƙarƙashin yanayin aiki mara daidaituwa, kamar tuƙi a halin yanzu daban-daban ko a cikin yanayin zafi daban-daban. Lanƙwasa suna taimakawa wajen zaɓar masu hana halin yanzu da suka dace da kuma hasashen haske da canjin launi a cikin kewayon zafin aikin samfurin.

5. Bayanin Injiniya da Kunshi

5.1 Girman Kunshi

LED yana cikin kunshin P-LCC-4. Matsakaicin girman kunshin shine 6.0mm tsawon, 3.2mm faɗi, da 1.9mm tsayi (matsakaicin ƙima, duba zanen girma don cikakkun bayanai). Kunshin ya haɗa da kofi mai haske. Zanen yana nuna wuraren kafet ɗin anode da cathode don guntayen ja, kore, da shuɗi. Duk juzu'i da ba a ƙayyade ba shine ±0.1mm.

5.2 Gano Polarity

Zanen kunshin yana nuna polarity a sarari. Daidaitaccen haɗin polarity yana da mahimmanci don hana lalacewar bias na baya, wanda ya iyakance zuwa 5V. Dole ne masu ƙira su daidaita sawun PCB tare da zanen kunshin don tabbatar da daidaitaccen alkibla yayin haɗawa.

6. Jagororin Gishiri da Haɗawa

6.1 Bayanin Yanayin Sake Kwararar Gishiri

Ana ba da shawarar bayanin zafin jiki na sake kwararar gishiri mara gubar. Manyan ma'auni sun haɗa da: yankin dumama kafin a 150-200°C na dakika 60-120 tare da matsakaicin ƙimar hawan 3°C/sec; lokacin sama da 217°C ya kamata ya zama dakika 60-150; matsakaicin zafin jiki bai kamata ya wuce 260°C ba, tare da lokacin a wannan kololuwar ya iyakance zuwa matsakaicin dakika 10; ƙimar sanyaya bai kamata ta wuce 6°C/sec ba. Bai kamata a yi sake kwararar gishiri fiye da sau biyu akan na'urar ɗaya ba.

6.2 Adanawa da Kula da Kula

Ana kunna LED a cikin jakunkuna masu hana danshi. Kada a buɗe jakar har sai an shirya abubuwan don amfani. Kafin buɗewa, a adana a ≤ 30°C da ≤ 90% RH. Bayan buɗewa, abubuwan suna da rayuwar bene na sa'o'i 168 a ƙarƙashin sharuɗɗan ≤ 30°C da ≤ 60% RH. Dole ne a sake rufe abubuwan da ba a yi amfani da su ba a cikin kunshin mai hana danshi. Idan mai nuna danshi ya nuna aiki ko kuma an wuce lokacin ajiya, ana buƙatar maganin gasa a 60°C ± 5°C na awanni 24 kafin gishiri.

6.3 Kariya daga Wuce Gona da Irin Halin Yanzu

Resistan mai hana halin yanzu na waje wajibi ne. Ƙarfin lantarki na gaba yana da juzu'i, kuma ɗan canji kaɗan zai iya haifar da babban canji a cikin halin yanzu, wanda zai iya haifar da ƙonewa. Dole ne a ƙididdige ƙimar resistor bisa ga ƙarfin wutar lantarki da halayen ƙarfin lantarki/halin yanzu na LED.

7. Bayanin Kunshi da Oda

Ana ba da LED akan tef ɗin masu ɗaukar kaya masu hana danshi, waɗanda daga nan ake jujjuya su akan reels. Matsakaicin adadin da aka ɗora shine guda 2000 a kowace reel. Ana ba da girman tef ɗin mai ɗaukar kaya da reel a cikin bayanin. Alamar da ke kan reel tana ba da mahimman bayanai, gami da Lambar Samfurin (P/N), adadin shiryawa (QTY), da takamaiman lambobin kwandon don Matsayin Ƙarfin Haske (CAT), Matsayin Matsakaicin Tsayin Raƙuman Ruwa (HUE), da Matsayin Ƙarfin Lantarki na Gaba (REF).

8. Shawarwari na Aikace-aikace

8.1 Yanayin Aikace-aikace na Yau da Kullun

8.2 Abubuwan da ake la'akari da Ƙira

9. Kwatancen Fasaha da Bambance-bambance

Idan aka kwatanta da nau'ikan LED SMD marasa mai haske a cikin irin wannan kunshi, mai haske mai haɗaka na jerin 67-23 yana ba da mafi girman ƙarfin haske na axial don irin wannan halin yanzu na tuƙin guntu, yayin da mai haske ke jagorantar ƙarin haske gaba. Kunshin P-LCC-4 tare da taga mai tsabta yawanci yana ba da ingantaccen ingantaccen fitar da haske fiye da kunshin da aka watsa. Samun launuka uku daban-daban, manyan launuka na farko (ja, kore, shuɗi) a cikin nau'in kunshi ɗaya yana sauƙaƙa kayan aiki da ƙira don tsarin nuna launuka da yawa. Ƙayyadaddun rarraba don ƙarfi da tsayin raƙuman ruwa yana ba masu ƙira da hasashen aikin launi da haske, wanda ke da fa'ida akan madadin da ba a rarraba ba ko kuma an rarraba su a sako-sako.

10. Tambayoyin da ake yawan yi (Dangane da Ma'auni na Fasaha)

Q: Zan iya tuƙa LED kore da shuɗi a 3.3V kai tsaye?

A: Mai yiwuwa, amma ba tare da aminci ba. Matsakaicin ƙarfin lantarki na gaba shine 3.4V, tare da matsakaicin 3.95V. A 3.3V, LED bazai kunna gabaɗaya ko kwata-kwata ba, musamman a ƙananan yanayin zafi inda VFyana ƙaruwa. Ana ba da shawarar da'irar haɓakawa ko mafi girman ƙarfin wutar lantarki (misali, 5V) tare da resistor mai hana halin yanzu.

Q: Menene bambanci tsakanin tsayin raƙuman ruwa na kololuwa da matsakaicin tsayin raƙuman ruwa?

A: Tsayin raƙuman ruwa na kololuwa (λp) shine tsayin raƙuman ruwa inda rarraba ikon bakan ya fi girma. Matsakaicin tsayin raƙuman ruwa (λd) shine tsayin raƙuman ruwa guda ɗaya na hasken monochromatic wanda ya dace da launin da aka gani na LED. λdya fi dacewa don ƙayyadaddun launi a cikin hangen nesa na ɗan adam.

Q: Ta yaya zan fassara kwandon ƙarfin haske don ƙirar ta?

A: Zaɓi kwandon bisa ga mafi ƙarancin haske da ake buƙata don aikace-aikacen ku a ƙarƙashin mafi munin yanayi (misali, babban zafin jiki, ƙarshen rayuwa). Yin amfani da babban kwandon (misali, S maimakon R) yana ba da gefen haske. Ƙayyade lambar kwandon da ake buƙata (CAT) lokacin yin oda.

11. Ƙirar Aiki da Yanayin Amfani

Harka: Ƙirar Panel Mai Nuna Matsayi da Yawa

Samfurin yana buƙatar mai nuna launi guda ɗaya don nuna wutar lantarki (kore mai tsayayye), jiran aiki (shuɗi mai flicker), da kuskure (ja mai tsayayye). An zaɓi 67-23/R6GHBHC-B05/2T. Ƙirar tana amfani da microcontroller tare da fil ɗin GPIO guda uku, kowanne an haɗa shi da cathode na launin LED ɗaya ta hanyar resistor mai hana halin yanzu (wanda aka ƙididdige don tuƙin 20mA daga wadataccen wutar lantarki 5V: ~80 ohms don ja, ~82 ohms don kore/shuɗi, la'akari da VFjuzu'i). An haɗa anodes zuwa 5V. Software yana sarrafa filaye don haskaka launin da ake so. Faɗin kusurwar kallo digiri 120 yana tabbatar da ganuwa daga kusurwoyi daban-daban. Mai ƙira ya ƙayyade kwandon CAT=S don kore da shuɗi da CAT=R don ja don tabbatar da isasshen haske, kuma ya nemi kwandon HUE daidai da kamannin launin da ake so.

12. Gabatarwar Ƙa'idar Aiki

Diodes Masu Fitowa Haske (LEDs) na'urorin semiconductor ne waɗanda ke fitar da haske ta hanyar electroluminescence. Lokacin da aka yi amfani da ƙarfin lantarki na gaba a kan mahaɗin p-n, electrons da ramuka suna sake haɗuwa a cikin yanki mai aiki, suna sakin makamashi a cikin nau'in photons. Launin hasken da aka fitar yana ƙaddara ta hanyar tazarar bandgap na kayan semiconductor da aka yi amfani da su a cikin yanki mai aiki. A cikin wannan samfurin, guntun Ja (R6) yana amfani da kayan AlGaInP, yayin da guntun Kore (GH) da Shuɗi (BH) ke amfani da kayan InGaN. Mai haske mai haɗaka, wanda aka yi da kayan haske mai haske, yana kewaye da guntun semiconductor kuma yana mayar da hasken gefen da aka fitar gaba, yana ƙara amfanin fitar da haske a cikin alkiblar kallo. Epoxy resin mai tsabta yana kare guntu kuma yana aiki azaman ruwan tabarau na farko.

13. Trends na Masana'antu da Ci gaba

Kasuwannin LED na SMD suna ci gaba da yin tafiya zuwa mafi inganci (ƙarin lumens a kowace watt), ƙananan girman kunshi don ƙanƙanta, da ingantaccen daidaiton launi ta hanyar ƙaramin rarraba. Hakanan ana ƙara mai da hankali kan aminci a ƙarƙashin yanayin zafi da yawan halin yanzu, wanda aikace-aikace kamar hasken mota da nunin haske mai haske ke motsa shi. Amfani da manyan kayan, kamar sabbin phosphors don fararen LED da ingantattun abubuwan haɗawa don mafi kyawun kwanciyar hankali na zafi da UV, yana ci gaba. Bugu da ƙari, haɗa na'urorin sarrafa lantarki (misali, direbobi na halin yanzu na yau da kullun) a cikin kunshin LED wani ci gaba ne na ci gaba don sauƙaƙe ƙirar da'ira da inganta kwanciyar hankali na aiki.

Kalmomin Ƙayyadaddun LED

Cikakken bayanin kalmomin fasaha na LED

Aikin Hasken Wutar Lantarki

Kalma Naúrar/Wakilci Bayanin Sauri Me yasa yake da muhimmanci
Ingancin Hasken Wuta lm/W (lumen kowace watt) Fitowar haske kowace watt na wutar lantarki, mafi girma yana nufin mafi ingancin kuzari. Kai tsaye yana ƙayyade matakin ingancin kuzari da farashin wutar lantarki.
Gudun Hasken Wuta lm (lumen) Jimillar hasken da tushe ke fitarwa, ana kiransa "haske". Yana ƙayyade ko hasken yana da haske sosai.
Kusurwar Dubawa ° (digiri), misali 120° Kusurwar da ƙarfin haske ya ragu zuwa rabi, yana ƙayyade faɗin haske. Yana shafar kewar haskakawa da daidaito.
Zafin Launi (CCT) K (Kelvin), misali 2700K/6500K Zafi/sanyin haske, ƙananan ƙimomi rawaya/zafi, mafi girma fari/sanyi. Yana ƙayyade yanayin haskakawa da yanayin da suka dace.
CI / Ra Ba naúrar, 0–100 Ikon ba da launukan abubuwa daidai, Ra≥80 yana da kyau. Yana shafar sahihancin launi, ana amfani dashi a wurare masu buƙatu kamar shaguna, gidajen tarihi.
SDCM Matakan ellipse MacAdam, misali "5-mataki" Ma'aunin daidaiton launi, ƙananan matakai suna nufin mafi daidaiton launi. Yana tabbatar da daidaiton launi a cikin rukunin LED iri ɗaya.
Matsakaicin Tsawon Raɗaɗin Hasken nm (nanomita), misali 620nm (ja) Tsawon raɗaɗin haske daidai da launin LED masu launi. Yana ƙayyade launin ja, rawaya, kore LED masu launi ɗaya.
Rarraba Bakan Hasken Layin tsawon raɗaɗi da ƙarfi Yana nuna rarraba ƙarfi a cikin tsawon raɗaɗin haske. Yana shafar ba da launi da ingancin launi.

Ma'auni na Lantarki

Kalma Alamar Bayanin Sauri Abubuwan ƙira
Ƙarfin lantarki na gaba Vf Mafi ƙarancin ƙarfin lantarki don kunna LED, kamar "maƙallan farawa". Ƙarfin lantarki na injin dole ya zama ≥Vf, ƙarfin lantarki yana ƙara don LED a jere.
Ƙarfin lantarki na gaba If Ƙimar ƙarfin lantarki don aikin LED na yau da kullun. Yawanci tuƙi mai ƙarfi akai-akai, ƙarfin lantarki yana ƙayyade haske da tsawon rai.
Matsakaicin Ƙarfin lantarki na bugun jini Ifp Matsakaicin ƙarfin lantarki mai jurewa na ɗan lokaci, ana amfani dashi don duhu ko walƙiya. Fadin bugun jini da sake zagayowar aiki dole ne a sarrafa su sosai don guje wa lalacewa.
Ƙarfin lantarki na baya Vr Matsakaicin ƙarfin lantarki na baya da LED zai iya jurewa, wanda ya wuce zai iya haifar da rushewa. Dangane dole ne ya hana haɗin baya ko ƙarfin lantarki.
Juriya na zafi Rth (°C/W) Juriya ga canja wurin zafi daga guntu zuwa solder, ƙasa yana da kyau. Babban juriya na zafi yana buƙatar zubar da zafi mai ƙarfi.
Rigakafin ESD V (HBM), misali 1000V Ikon jurewa zubar da wutar lantarki, mafi girma yana nufin ƙasa mai rauni. Ana buƙatar matakan hana wutar lantarki a cikin samarwa, musamman ga LED masu hankali.

Gudanar da Zafi & Amincewa

Kalma Ma'aunin maɓalli Bayanin Sauri Tasiri
Zazzabin Haɗin gwiwa Tj (°C) Ainihin yanayin aiki a cikin guntun LED. Kowane raguwa 10°C na iya ninka tsawon rai; yayi yawa yana haifar da lalacewar haske, canjin launi.
Ragewar Lumen L70 / L80 (sa'o'i) Lokacin da haske ya ragu zuwa 70% ko 80% na farko. Kai tsaye yana ayyana "tsawon sabis" na LED.
Kula da Lumen % (misali 70%) Kashi na hasken da aka riƙe bayan lokaci. Yana nuna riƙon haske akan amfani na dogon lokaci.
Canjin Launi Δu′v′ ko ellipse MacAdam Matsakaicin canjin launi yayin amfani. Yana shafar daidaiton launi a cikin yanayin haskakawa.
Tsufa na Zafi Lalacewar kayan aiki Lalacewa saboda yanayin zafi na dogon lokaci. Zai iya haifar da raguwar haske, canjin launi, ko gazawar buɗe kewaye.

Tufafi & Kayan Aiki

Kalma Nau'ikan gama gari Bayanin Sauri Siffofi & Aikace-aikace
Nau'in Kunshin EMC, PPA, Yumbu Kayan gida masu kare guntu, samar da hanyar sadarwa ta gani/zafi. EMC: juriya mai kyau na zafi, farashi mai rahusa; Yumbu: mafi kyawun zubar da zafi, tsawon rai.
Tsarin Guntu Gaba, Guntu Juyawa Tsarin na'urorin lantarki na guntu. Juyawar guntu: mafi kyawun zubar da zafi, inganci mafi girma, don ƙarfi mai ƙarfi.
Rufin Phosphor YAG, Silicate, Nitride Yana rufe guntu shuɗi, yana canza wasu zuwa rawaya/ja, yana haɗa su zuwa fari. Phosphor daban-daban suna shafar inganci, CCT, da CRI.
Ruwan tabarau/Optics Lefi, Microlens, TIR Tsarin gani a saman yana sarrafa rarraba haske. Yana ƙayyade kusurwar dubawa da layin rarraba haske.

Kula da Inganci & Rarraba

Kalma Abun rarraba Bayanin Sauri Manufa
Kwalin Gudun Hasken Lambar misali 2G, 2H An tattara su ta hanyar haske, kowace ƙungiya tana da ƙananan/matsakaicin ƙimar lumen. Yana tabbatar da daidaiton haske a cikin jeri ɗaya.
Kwalin Ƙarfin lantarki Lambar misali 6W, 6X An tattara su ta hanyar kewayon ƙarfin lantarki na gaba. Yana sauƙaƙe daidaitawar tuƙi, yana inganta ingancin tsarin.
Kwalin Launi Ellipse MacAdam 5-mataki An tattara su ta hanyar daidaitattun launi, yana tabbatar da ƙuntataccen kewayon. Yana ba da garantin daidaiton launi, yana guje wa launi mara daidaituwa a cikin kayan aikin.
Kwalin CCT 2700K, 3000K da sauransu An tattara su ta hanyar CCT, kowanne yana da madaidaicin kewayon daidaitawa. Yana cika buƙatun CCT na yanayi daban-daban.

Gwaji & Takaddun Shaida

Kalma Matsakaicin/Gwaji Bayanin Sauri Muhimmanci
LM-80 Gwajin kula da lumen Haskakawa na dogon lokaci a yanayin zafi akai-akai, yana rikodin lalacewar haske. Ana amfani dashi don kimanta rayuwar LED (tare da TM-21).
TM-21 Matsakaicin kimanta rayuwa Yana kimanta rayuwa a ƙarƙashin yanayi na ainihi bisa bayanan LM-80. Yana ba da hasashen kimiyya na rayuwa.
IESNA Ƙungiyar Injiniyoyin Haskakawa Yana rufe hanyoyin gwajin gani, lantarki, zafi. Tushen gwaji da masana'antu suka amince.
RoHS / REACH Tabbatarwar muhalli Yana tabbatar da babu abubuwa masu cutarwa (darma, mercury). Bukatar shiga kasuwa a duniya.
ENERGY STAR / DLC Tabbatarwar ingancin kuzari Tabbatarwar ingancin kuzari da aiki don samfuran haskakawa. Ana amfani dashi a cikin sayayyan gwamnati, shirye-shiryen tallafi, yana haɓaka gasa.