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Cover Vent Baffle for Noise Reduction

IP.com Disclosure Number: IPCOM000050141D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Lawson, FM: AUTHOR [+4]

Abstract

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.

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Cover Vent Baffle for Noise Reduction

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.

This improvement is a cover vent baffle which reduces noise measurements in the vent area and also allows sufficient air flow for cooling. The baffle 10, shown in Fig. 1, attaches to the cover 12 directly behind the platen 14. Foam 16 is then placed on the baffle 10 and the cover 12. Since the printer is the major noise source in the machine, the noise must propogate in a winding path around the baffle 10 in order to escape from the machine. Without the baffle 10, the noise has a much easier "line of sight" path out of the machine. The result is noise reduction in the rear when performing one meter measurements.

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