1976-12-22
1979-06-05
Witkowski, Stanley J.
58 50R, G04C 300, G04C 1900
Patent
active
041570073
ABSTRACT:
An electronic watch module includes a circuit board having all the electronic watch components including a plurality of LED's and a CMOS integrated circuit device mounted on one side thereof defined as the face of the board. The board is of a generally flat circular configuration and having generally rectangular cutouts at the upper side thereof for mounting a crystal oscillator and a pair of arcuate slots or cutouts along the edge thereof for mounting a pair of elastomeric switch contact members. A cover for the board includes a transparent portion defining a transparent portion sealingly enclosing the LED's and an opaque portion defining an opaque compartment for sealingly enclosing the CMOS integrated circuit device. The cover is hermetically sealed to the board for sealing these components. The overall layout of the circuit on the board is related to guide flats to facilitate automatic testing.
The method disclosed includes the mounting of the electronic components of the watch including a plurality of LED's and a CMOS integrated circuit on the face of a selected printed circuit board by first screening an epoxy on selected areas of the surface of the circuit board and mounting the electronic components on the selected areas, curing the epoxy in a nitrogen purged oven, and thereafter hermetically sealing the electronic components of the watch module by means of a cover including a transparent portion sealingly enclosing the LED's and an opaque portion sealingly enclosing the CMOS integrated circuit, the cover being mounted by the step of screening epoxy on the underside thereof placing the cover on the printed circuit board clipping the board and cover together and placing in an oven purged by nitrogen and heating for a period of time sufficient to cure the epoxy.
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patent: 3911666 (1975-10-01), Haber
patent: 3973099 (1976-08-01), Morris, Sr.
patent: 3983689 (1976-10-01), Burke et al.
patent: 3986335 (1976-10-01), Harper
patent: 4001553 (1977-01-01), Troutman et al.
patent: 4009564 (1977-03-01), Zurcher
patent: 4051662 (1977-10-01), O'Connor et al.
patent: 4060971 (1977-12-01), O'Connor et al.
patent: 4075825 (1978-02-01), Murakami et al.
patent: 4083177 (1978-04-01), Nishimura et al.
patent: 4086754 (1978-05-01), Yonekawa et al.
National Semiconductor Corporation
Witkowski Stanley J.
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