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Cover Vent Baffle for Noise Reduction Disclosure Number: IPCOM000050141D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10

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Lawson, FM Passafiume, JE Smith, SA Vaughan, JL [+details]


Thermal characteristics of electronic typewriters require the placement of vents in the center cover assembly. These vents are placed directly behind the platen, as shown in Fig. 1, and allow air to enter the rear of the machine where it can cool the electrical components. While the vents permit proper cooling of the machine, they also provide an easy path for noise to escape. Since the vents are in the rear of the machine, noise measurements in that area are significantly higher than at other positions of comparable distance from the machine. Consequently, trade offs must be made in the cover vent design to insure adequate machine cooling while still achieving the acoustic specifications.