?????? ? revision: ? a ?? release ? level: ? active ? sheet ? 1 ? of ? 5 ?? ? ?2011 ? knowles ? electronics ? kj \ 33000 ? ? ? ? ? ? ? ? ? ? joystick ? mechanical ? button ? integration ? note ? ? reference ? design ? ? ? ? ? ? ? ? ? knowles ? acoustics ? 1151 ? maplewood ? drive ? itasca, ? il ? 60143 ?
?????? ? revision: ? a ?? release ? level: ? active ? sheet ? 2 ? of ? 5 ?? ? ?2011 ? knowles ? electronics ? kj \ 33000 ? 1. description ? and ? application ? ? 1.1 ? description ? joystick ? integration ? into ? customer ? products ? is ? dependent ? upon ? many ? factors. ?? the ? described ? simple ? implementation ? case ? provides ? superior ? protection ? from ? external ? loads ? and ? protection ? against ? incidental ? water ? contact. ?? this ? is ? similar ? to ? protection ? provided ? in ? portable ? gaming ? devices ? present ? in ? the ? market ? today. ? ? 1.2 ? application ? joystick ? is ? developed ? for ? hand ? held ? telecommunication ? and ? electronic ? devices. ?? document ? describes ? a ? joystick ? implementation ? where ? minimizing ? height ? or ? maintaining ? a ? water \ tight ? seal ? are ? not ? a ? concern. ?? this ? design ? is ? taken ? from ? the ? knowles ? navigator ? unit. ?? refer ? to ? manufacturer?s ? website ? ( www.knowles.com ) ? for ? current ? application ? notes. ? ? 2. stack \ up ? the ? following ? parts ? are ? required ? in ? this ? design: ? 1 ? ? ? button ? 2 ?\? outside ? housing ? 3 ?\? inside ? housing ? 4 ?\? joystick ? 5 ?\? pcb ? ? ?
?????? ? revision: ? a ?? release ? level: ? active ? sheet ? 3 ? of ? 5 ?? ? ?2011 ? knowles ? electronics ? kj \ 33000 ? 3. part ? design ? considerations ? ? ? ? button ? part ? shown ? is ? made ? from ? polycarbonate ? with ? a ? 7.3 ? mm ? diameter ? and ? 1 ? mm ? concave ? depth. ?? part ? is ? supported ? by ? the ? inside ? housing. ?? housing ? gap ? is ? set ? to ? device ? travel ? plus ? assembly ? tolerance ? from ? button ? to ? housing ? opening. ?? button ? movement ? is ? limited ? by ? the ? gap ? from ? the ? inside ? housing ? to ? button. ?? a ? dust ? seal ? between ? the ? button ? and ? the ? inside ? housing ? exists ? since ? the ? surfaces ? are ? flat ? and ? always ? overlapping. ?? customers ? wanting ? to ? experiment ? with ? different ? shapes ? should ? replacing ? this ? part ? and ? use ? multiple ? units ? so ? that ? side \ to \ side ? comparisons ? can ? be ? considered. ? outside ? housing ? outside ? housing ? needs ? to ? protect ? the ? button ? from ? excessive ? vertical ? or ? side ? loading ? while ? providing ? finger ? access ? to ? the ? button. ?? design ? shown ? has ? a ? 0.7mm ? deep ? recess ? in ? the ? housing. ?? the ? button ? cap ? protrudes ? 0.4mm ? past ? the ? housing ? surface. ?? a ? flange ? on ? the ? inside ? of ? the ? housing ? sets ? the ? flange ? clearance. ?? this ? must ? always ? be ? greater ? than ? zero ? to ? keep ? the ? button ? free ? sliding. ?? the ? flange ? also ? determines ? the ? flange ? gap. ?? this ? should ? be ? set ? to ? the ? button ? travel ? plus ? an ? allowance ? for ? button ? to ? outside ? housing ? misalignment. ? ? ?
?????? ? revision: ? a ?? release ? level: ? active ? sheet ? 4 ? of ? 5 ?? ? ?2011 ? knowles ? electronics ? kj \ 33000 ? inside ? housing ? material ? selected ? is ? nylon ? for ? its ? bearing ? properties ? and ? low ? surface ? energy. ?? inside ? housing ? locates ? off ? of ? the ? joystick. ?? it ? also ? provides ? the ? floor ? of ? the ? cavity ? that ? the ? button ? flange ? slides ? upon. ?? in ? this ? design, ? the ? inside ? dimension ? that ? straddles ? the ? joystick ? is ? 10mm. ?? if ? watertight ? construction ? is ? desired, ? then ? a ? gasket ? would ? be ? needed ? to ? seal ? this ? housing. ?? contact ? knowles ? for ? application ? support ? on ? waterproofing. ? ? joystick ? joystick ? implemented ? with ? no ? significant ? vertical ? placed ? on ? the ? part. ?? this ? provides ? maximum ? protection ? against ? shock. ?? if ? a ? design ? requires ? the ? case ? clearance ? to ? be ? eliminated, ? then ? the ? base ? of ? the ? button ? must ? extend ? to ? the ? edges ? of ? the ? joystick ? cover. ? caution! ?? vertical ? loading ? on ? the ? joystick ? ball ? can ? break ? the ? unit. ?? make ? sure ? that ? stem ? clearance ? is ? always ? present. ?? button ? designs ? that ? interfere ? with ? the ? ball ? will ? likely ? cause ? the ? unit ? to ? fail. ? ? pcb ? this ? design ? transmits ? button ? forces ? directly ? to ? the ? pcb. ?? the ? pcb ? is ? clamped ? between ? the ? outside ? housings. ?? possible ? concerns ? include ? any ? negative ? results ? of ? flexing ? the ? pcb, ? including ? cracking ? of ? the ? pcb ? or ? cracking ? traces ? within ? the ? pcb. ?? as ? a ? result, ? the ? pcb ? must ? be ? well ? supported ? to ? mitigate ? these ? effects. ? ? 4. stack \ up ? height ? stack \ up ? height ? is ? strongly ? influenced ? by ? other ? design ? decisions. ?? in ? the ? case ? of ? the ? reference ? design, ? the ? overall ? device ? size ? was ? chosen ? to ? be ? a ? good ? fit ? in ? the ? hand. ?? this ? results ? in ? a ? 9.2mm ? stack \ up ? height ? from ? surface ? of ? pcb ? to ? highest ? point ? on ? button. ??? ? using ? the ? same ? principles ? and ? materials, ? but ? switching ? from ? a ? concave ? to ? convex ? button ? shape ? would ? result ? in ? a ? stack \ up ? as ? short ? as ? 4.0mm. ?? the ? button?s ? crown ? would ? likely ? be ? flush ? to ? sub \ flush ? of ? the ? outside ? surface. ?? the ? limiting ? stack \ up ? loops ? are: ? ? ? 1> ? joystick ? (3.2mm), ? stem ? clearance ? (0.2mm) ? and ? button ? cap ? (0.6mm), ? or ? ? 2> ? joystick ? case ? (1.6mm), ? case ? clearance ? (0.2mm), ? inside ? housing ? (0.6mm), ? button ? flange ? (0.7mm), ? flange ? clearance ? (0.2mm) ? and ? housing ? (0.7mm) ? ?
?????? ? revision: ? a ?? release ? level: ? active ? sheet ? 5 ? of ? 5 ?? ? ?2011 ? knowles ? electronics ? kj \ 33000 ? switching ? the ? button ? to ? metal ? and ? directly ? supporting ? the ? button ? off ? of ? the ? pcb ? would ? allow ? further ? shortening ? to ? 3.7mm. ?? contact ? your ? local ? sales ? or ? manufacturing ? representative ? for ? application ? support. ? ? ? ? ? ? ? ? ? ? the ? information ? contained ? in ? this ? literature ? is ? based ? on ? our ? experience ? to ? date ? and ? is ? believed ? to ? be ? reliable ? and ? it ? is ? subject ? to ? change ? without ? notice. ? it ? is ? intended ? as ? a ? guide ? for ? use ? by ? persons ? having ? technical ? skill ? at ? their ? own ? discretion ? and ? risk. ? we ? do ? not ? guarantee ? favorable ? results ? or ? assume ? any ? liability ? in ? connection ? with ? its ? use. ? dimensions ? contained ? herein ? are ? for ? reference ? purposes ? only. ? for ? specific ? dimensional ? requirements ? consult ? factory. ? this ? publication ? is ? not ? to ? be ? taken ? as ? a ? license ? to ? operate ? under , ? or ? recommendation ? to ? infrin g e ? an y ? existin g ? p atents. ? this ? su p ersedes ? and ? voids ? all ? p revious ? literature. ?
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