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B3DA Datasheet(PDF) 2 Page - Omron Electronics LLC |
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B3DA Datasheet(HTML) 2 Page - Omron Electronics LLC |
2 / 6 page 274 Ultra-low Profile Dome Array B3DA Dimensions Unit: mm Construction Circular Contact When Dome Arrays are attached to the PCB, any PCB dust or foreign particles will tend to collect in the center of the key when it is pressed. Therefore, poor contact occurs easily in Dome Arrays that provide contact at the center point only. The circular contact construction provides contact along the circumference of a circle, thus preventing poor contact by avoiding the center point. Matrix Adhesive The surface structure of this adhesive has grid-shaped slits, as shown in the following cross-sectional diagram. These slits provide both ventilation and dust-proofing, which is required for contact dome operation. Separator (paper) Sheet thickness (0.05) Cover film Contact dome (5 dia.) Thickness: 0.06 B enlarged A-A cross section Two, 2.1 dia. Four, R5 Contact dome diameter 5 dia. (18 keys) Operating force (OF) 1.57 ± 0.49 N Plating Unplated B3DA-0000-A Separator (paper) Sheet thickness (0.05) Cover film Contact dome (4 dia.) Thickness: 0.06 B enlarged A-A cross section Two, 2.1 dia. Four, R5 Contact dome diameter 4 dia. (18 keys) Operating force (OF) 1.57 ± 0.49 N Plating Unplated B3DA-0010-A Cylindrical protrusion Contact along circle circumference (circular contact) Contact at center point Conventional models Contact dome resistant to foreign matter (circular contact) Separator Cover film Matrix adhesive Stainless steel contact dome (circular contact) 15 µm Slits Matrix (acrylic) adhesive: 25 µm Cover film |
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