公开(公告)号：US3829632A

公开(公告)日：1974-08-13

申请号：US33737473

申请日：1973-03-02

Applicant: BURROUGHS CORP

Inventor： KLEHM W

IPC: H01H13/06 ,  H01H13/702 ,  H01H13/705 ,  H01H13/785 ,  H03M7/00 ,  H03M11/20 ,  H01H13/70 ,  H01H9/04

CPC classification number: H01H13/785 ,  H01H13/063 ,  H01H13/702 ,  H01H13/705 ,  H01H2201/012 ,  H01H2201/03 ,  H01H2205/032 ,  H01H2215/006 ,  H01H2221/05 ,  H01H2221/064 ,  H01H2227/002 ,  H01H2227/016 ,  H03M7/00 ,  H03M11/20

Abstract: Relates generally to the production of electricial signals from a keyboard, each key of which is individually operatively associated with a switching device whose activation to electrical conductive condition is controlled by the displacement of the key. These switches are hermetically sealed from the atmosphere and are electrically scanned in succession at relatively high speeds and at a repetitious rate such that several scanning cycles occur during the normal activation of a selected key. The keyboard mechanism also includes a shift register having one more bit position than the number of switch devices and into which a bit is introduced into the ''''one'''' position at the instant the scan encounters a closed switch of the keyboard. This bit is then shifted through the register in timed relation to the scan of the remaining key switches and unloaded into the last bit position of the register. A detector senses the presence of a bit in both the ''''one'''' position and the last position of the shift register and upon detection of a bit solely in the one position it delivers a signal indicative of the character represented by the actuated key and upon detecting bits in the two extreme positions of the shift register it nullifies the delivery of such a signal.

公开(公告)号：US3755890A

公开(公告)日：1973-09-04

申请号：US3755890D

申请日：1970-01-12

Applicant: BURROUGHS CORP

Inventor： KLEHM W

IPC: H01H11/04 ,  H05K3/00 ,  H05K3/34 ,  H05K3/40 ,  H05K3/42 ,  H05K3/22

CPC classification number: H05K3/0011 ,  H05K3/0055 ,  H05K2201/09572 ,  H05K2203/083 ,  H05K2203/085 ,  H05K2203/1105 ,  Y10T29/49155

Abstract: Relates to the avoidance of electrical discontinuities arising in the production of two-sided printed circuit boards having plated-through-holes and particularly occurring in the use of solder for improving the electrical interconnections. Research disclosed that the cause of these discontinuities lay in the material of the boards surrounding the holes which either included entrapped gas or matter vaporizable under the high temperatures of the liquid solder applied to fill the holes and which impaired the attainment of reliable plated-through-hole connections. A vacuum evaporation operation is incorporated in the fabrication process and found highly useful and efficient in the production of reliable hole connections substantially reducing if not completely eliminating any need to apply solder touch-ups to the boards thereafter. Specifically, the boards are treated prior to the soldering of the plated-through holes to a temperature of approximately 250* F while concurrently being exposed to a vacuum of approximately 10 2 mm Hg for a sufficient time to drive out of the boards all matter vaporizable under such conditions. In carrying out this vacuum-heat treatment operation, inert gas is initially used in the treatment chamber to hasten the heating of the boards following which the chamber is exhausted of the gas and subjected to high vacuum while maintaining the temperature to which the boards have been raised. In returning the heat treatment chamber to normal room conditions, an inert gas may be re-introduced into the chamber to hasten the cooling of the circuit boards. When there will be an elapse of time before the soldering operation is performed, the de-gassed circuit boards are preferably placed in sealed containers or bags to prevent contact with the atmosphere and the resultant absorption of moisture and deleterious gasses therefrom.

Abstract translation: 关于避免在制造具有电镀通孔的双面印刷电路板中出现的电中断，并且特别是在使用焊料来改善电互连的情况下。 研究披露，这些不连续性的原因在于围绕孔的板材的材料，其包括在被施加以填充孔的液体焊料的高温下被包埋的气体或物质可蒸发，并且损害了获得可靠的电镀通孔， 孔连接。 在制造过程中并入真空蒸发操作，并且在生产可靠的孔连接方面发现非常有用和高效，这大大降低了如果不是完全消除了对其后的板进行焊接触摸的任何需要。 具体来说，在将电镀通孔焊接到约250°F的温度之前，对板进行处理，同时暴露于大约10-2mm Hg的真空下足够的时间以驱出板 所有物质在这种条件下可蒸发。 在进行这种真空热处理操作时，最初在处理室中使用惰性气体来加速板的加热，随后将室排出气体并经受高真空，同时保持板的温度 上调。 在将热处理室返回到正常室内条件下，可以将惰性气体重新引入室中以加速电路板的冷却。 当在进行焊接操作之前经过时间时，脱气电路板优选地放置在密封的容器或袋中，以防止与大气接触以及由此吸收水分和有害气体。

公开(公告)号：US3708876A

公开(公告)日：1973-01-09

申请号：US3708876D

申请日：1969-01-28

Applicant: BURROUGHS CORP

Inventor： KLEHM W

IPC: H05K3/00 ,  B41M3/08

CPC classification number: H05K3/0011 ,  H05K3/0055 ,  H05K2201/09572 ,  H05K2203/083 ,  H05K2203/085 ,  H05K2203/1105 ,  Y10T29/49155

Abstract: Relates to the avoidance of electrical discontinuities arising in the production of two-sided printed circuit boards having plated-through-holes and particularly occurring in the use of solder for improving the electrical interconnections. Research disclosed that the cause of these discontinuities lay in the material of the boards surrounding the holes which either included entrapped gas or matter vaporizable under the high temperatures of the liquid solder applied to fill the holes to assure reliable plated-through-hole connections. A vacuum evaporation operation was incorporated in the fabrication process and found highly useful and efficient in the production of reliable hole connections substantially reducing if not completely eliminating any need to apply solder touch-ups to the boards thereafter. Specifically, the boards were treated prior to the soldering of the plated-through holes to a temperature of approximately 250* F while concurrently being exposed to a vacuum of approximately 10 2 mm Hg for a sufficient time to drive out of the boards all matter vaporizable under such conditions.

Abstract translation: 关于避免在制造具有电镀通孔的双面印刷电路板中出现的电中断，并且特别是在使用焊料来改善电互连的情况下。 研究公开了这些不连续性的原因在于围绕孔的板材的材料，其包括在被施加以填充孔的液体焊料的高温下被包埋的气体或物质可蒸发，以确保可靠的电镀通孔连接。 在制造过程中并入真空蒸发操作，并且发现在生产可靠的孔连接方面非常有用和高效，这大大减少，如果不能完全消除任何需要在其后对板进行焊接接触。 具体来说，在将电镀通孔焊接到约250°F的温度之前将板处理，同时暴露于大约10 -2mm Hg的真空足够的时间以驱出板 所有物质在这种条件下可蒸发。

公开(公告)号：US3757284A

公开(公告)日：1973-09-04

申请号：US3757284D

申请日：1972-04-03

Applicant: BURROUGHS CORP

Inventor： KLEHM W

IPC: H01R13/11 ,  H05K7/10 ,  H01R11/22

CPC classification number: H05K7/1038 ,  H01R12/58 ,  H01R13/11

Abstract: A contact terminal of the socket type preferably formed from sheet metal stock in which the socket portion thereof is folded into channel formation to provide two side walls each similarly longitudinally bowed toward one another to bring their respective midsections into juxtaposition. Each side wall is dimpled in its midsection to form an inwardly directed protrusion which is in offset relation to the protrusion of the other side wall, the two protrusions extending across the space between the midsections and cooperating therewith to provide a constricted passage for receiving a contact member introduced therebetween. With this construction the gripping forces applied by the midsections of the two side walls are substantially greater than the forces opposing the introduction of a contact member therebetween, the gripping forces in the region of the midsections acting perpendicularly to the axial dimension of the socket and applying a squeezing pressure considerably greater than the force required to insert and withdraw the contact member, thereby preventing the latter from buckling when introduced thereinto.

公开(公告)号：US3745536A

公开(公告)日：1973-07-10

申请号：US3745536D

申请日：1971-03-01

Applicant: BURROUGHS CORP

Inventor： KLEHM W

IPC: H01H13/06 ,  H01H13/702 ,  H01H13/705 ,  H01H13/785 ,  H03M7/00 ,  H03M11/20 ,  G11C19/00

CPC classification number: H01H13/785 ,  H01H13/063 ,  H01H13/702 ,  H01H13/705 ,  H01H2201/012 ,  H01H2201/03 ,  H01H2205/032 ,  H01H2215/006 ,  H01H2221/05 ,  H01H2221/064 ,  H01H2227/002 ,  H01H2227/016 ,  H03M7/00 ,  H03M11/20

Abstract: Relates generally to the production of electrical signals from a keyboard, each key of which is individually operatively associated with a switching device whose activation to electrical conductive condition is controlled by the displacement of the key. These switches are hermetically sealed from the atmosphere and are electrically scanned in succession at relatively high speeds and at a repetitious rate such that several scanning cycles occur during the normal activation of a selected key. The keyboard mechanism also includes a shift register having one more bit position than the number of switch devices and into which a bit is introduced into the ''''one'''' position at the instant the scan encounters a closed switch of the keyboard. This bit is then shifted through the register in timed relation to the scan of the remaining key switches and unloaded into the last bit position of the register. A detector senses the presence of a bit in both the ''''one'''' position and the last position of the shift register and upon detection of a bit solely in the one position it delivers a signal indicative of the character represented by the actuated key and upon detecting bits in the two extreme positions of the shift register it nullifies the delivery of such a signal.