Minnesota Mining and Manufacturing Company

Koss Corporation

Manfred W Suhr

Kenneth J Kirchhoff

Robert J Wolf

Lawrence J Fenske

Neil K Fortney

James J Frater

Keyboard support assembly

An articulated support assembly for a computer keyboard. The assembly includes a generally U shaped rigid support member, and a platform for supporting the keyboard pivotably mounted on a central portion of the support member. Projecting end portions of the support member are pivotably mounted on attachment members fixed to the bottom of a table or desk top. A releasable friction clutch restricts pivotal movement of the platform around the central portion of the support member. A releasable ratchet assembly prevents revolving movement of the central portion toward a lowered position relative to the attachment members. A switching mechanism can be manually activated to release the ratchet assemblies and the friction clutch so that the position and orientation of the platform relative to the table or desk top can be adjusted.

An acoustical transducer unit mountable in a speaker enclosure with a speaker opening adapted to face a user's ear, and a method for manufacturing the transducer. The transducer has a pair of opposing plates spaced apart a predetermined distance and a diaphragm physically connected and positioned between the plates, though electrically separated from the plates. The plates are adapted to be connected to an audio signal source, while the diaphragm receives a bias voltage. The transducer is mounted in the enclosure facing outward toward the speaker opening. The diaphragm is formed of a flexible substrate material such as MYLAR.TM.. A substantially infrared transparent material is deposited onto each side of the substrate in a thin layer to arrive at a transducer which is at a much higher level of performance than those of the prior art. The deposited material is infrared transparent so as to permit the deposition process to proceed without substantial damage or distortion to the diaphragm. Because the deposited metal is transparent to infrared energy, the diaphragm may be thinner than 5.0.times.10 meters, resulting in a transducer having substantially improved frequency response due to the thinness and low mass of the diaphragm.

Electrostatic acoustic transducer having extremely thin diaphragm

Growing community of inventors

Oregon, WI, United States of America

Manfred W Suhr