Re: [PEDA] Keypad land pattern design
Steve, having done the same design for a number of years, you need to work closely with your customer to meet their expectations for the keypad contacts. The design is typically not difficult or tightly restrained in any fashion except for the expected operation at the user level. There are a lot of issues that relate to the performance which go far beyond the work/no work issues. (i.e., type of device, key response time, is the button well restrained physically or does it roll significantly.) I worked for Advanced Gravis for five years, we did study after study of silicon membrane switches and developed our own requirements but the demands of a PC gamer are significantly different from a photocopier, portable CD player or other devices. One of your questions about finish, didn't you already answer that earlier when you mentioned carbon impregnated donut shape? You maybe weren't too clear there. My initial comment would be, if your boards are manufactured in SE Asia, gold flash over nickel, in SE Asia this is your cheapest finish which will work very well for membrane switches (4 - 8 micro inches gold flash, over 60 - 100 microinches of Nickel, life near infinite, the silicon will deteriorate before the finish is shot). Brad Velander, Lead PCB Designer, Norsat International Inc., #300 - 4401 Still Creek Dr., Burnaby, B.C., V5C 6G9. Tel. (604) 292-9089 direct Fax (604) 292-9010 website www.norsat.com > -Original Message- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, July 24, 2001 12:02 PM > To: Protel EDA Forum > Subject: [PEDA] Keypad land pattern design > > > > I need to design a landing pattern for a rubber key pad > switch. My customer > expects high volumes (it's a consumer product). The > conductive element of the > switch is carbon impregnated in a donut shape (.360in OD, .260in ID). > > In the past, I've simply followed the recommendations of the > manufacturer; > however, this manufacturer is located in Taiwan and it's > difficult to get the > information I need because any questions must be routed > through my customer. > That opens the door to prolonged responses and miscommunication. > > As a result, I'm exploring the idea of creating my own > landing pattern > design. I'm a bit nervous about it. > > I'd appreciate any design recommendations or possible sources > of information. > In addition to the landing pattern I need to specify the > finish of the land > pattern (gold plated, carbon screen, ??). I need reliability > and low cost. > > > Thanks, > Steve Allen > Project Engineer > Manufacturing Services, Inc. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * - or email - * mailto:[EMAIL PROTECTED]?body=leave%20proteledaforum * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Keypad land pattern design
> i've got that quote you asked for. you know 15 .lbs of sh*t in a ziploc > sandwich bag. we can do that for free and it has a half life of 33 million > years. A half-life of 33 million years. That's some powerful sh*t... ;-) Best regards, Ivan Baggett Bagotronix Inc. website: www.bagotronix.com - Original Message - From: "Joel Hammer" <[EMAIL PROTECTED]> To: "'Protel EDA Forum'" <[EMAIL PROTECTED]> Sent: Tuesday, July 24, 2001 3:53 PM Subject: Re: [PEDA] Keypad land pattern design > Reliability and low cost... wait a minute don't i work for you? > i've got that quote you asked for. you know 15 .lbs of sh*t in a ziploc > sandwich bag. we can do that for free and it has a half life of 33 million > years. let me know if this will do. if not perhaps we can get more creative > with the payment schedule. ;) > > sorry i cannot help for real. but i can't say these things to my customers > and i'm sure all of us have felt like telling them that on numerous > occasions. > > oh well, time to put my gloves back on and try to squeeze all of it in that > little bag!!! > > good luck! > > Joel L. Hammer > PCB Layout/Cad Specialist > E2 Enterprises Inc. > 636.949.9101 Ext. 26 > www.e2enterprises.com > > > > -Original Message- > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] > > Sent: Tuesday, July 24, 2001 2:02 PM > > To: Protel EDA Forum > > Subject: [PEDA] Keypad land pattern design > > > > > > > > I need to design a landing pattern for a rubber key pad > > switch. My customer > > expects high volumes (it's a consumer product). The > > conductive element of the > > switch is carbon impregnated in a donut shape (.360in OD, .260in ID). > > > > In the past, I've simply followed the recommendations of the > > manufacturer; > > however, this manufacturer is located in Taiwan and it's > > difficult to get the > > information I need because any questions must be routed > > through my customer. > > That opens the door to prolonged responses and miscommunication. > > > > As a result, I'm exploring the idea of creating my own > > landing pattern > > design. I'm a bit nervous about it. > > > > I'd appreciate any design recommendations or possible sources > > of information. > > In addition to the landing pattern I need to specify the > > finish of the land > > pattern (gold plated, carbon screen, ??). I need reliability > > and low cost. > > > > > > Thanks, > > Steve Allen > > Project Engineer > > Manufacturing Services, Inc. > > > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * - or email - * mailto:[EMAIL PROTECTED]?body=leave%20proteledaforum * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Re: [PEDA] Keypad land pattern design
Reliability and low cost... wait a minute don't i work for you? i've got that quote you asked for. you know 15 .lbs of sh*t in a ziploc sandwich bag. we can do that for free and it has a half life of 33 million years. let me know if this will do. if not perhaps we can get more creative with the payment schedule. ;) sorry i cannot help for real. but i can't say these things to my customers and i'm sure all of us have felt like telling them that on numerous occasions. oh well, time to put my gloves back on and try to squeeze all of it in that little bag!!! good luck! Joel L. Hammer PCB Layout/Cad Specialist E2 Enterprises Inc. 636.949.9101 Ext. 26 www.e2enterprises.com > -Original Message- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, July 24, 2001 2:02 PM > To: Protel EDA Forum > Subject: [PEDA] Keypad land pattern design > > > > I need to design a landing pattern for a rubber key pad > switch. My customer > expects high volumes (it's a consumer product). The > conductive element of the > switch is carbon impregnated in a donut shape (.360in OD, .260in ID). > > In the past, I've simply followed the recommendations of the > manufacturer; > however, this manufacturer is located in Taiwan and it's > difficult to get the > information I need because any questions must be routed > through my customer. > That opens the door to prolonged responses and miscommunication. > > As a result, I'm exploring the idea of creating my own > landing pattern > design. I'm a bit nervous about it. > > I'd appreciate any design recommendations or possible sources > of information. > In addition to the landing pattern I need to specify the > finish of the land > pattern (gold plated, carbon screen, ??). I need reliability > and low cost. > > > Thanks, > Steve Allen > Project Engineer > Manufacturing Services, Inc. > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * - or email - * mailto:[EMAIL PROTECTED]?body=leave%20proteledaforum * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Browse or Search previous postings: * http://www.mail-archive.com/proteledaforum@techservinc.com * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
