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Development of ultra-low distortion DU equipped with true diamond diaphragm Diamond has excellent physical properties such as speed of sound and hardness, making it the most suitable material for diaphragms. In particular, its excellent bending rigidity greatly contributed to the realization of the "ultra-low distortion DU" that we were aiming for. When observed with a laser displacement meter, even a hard metal diaphragm deforms in various directions, causing distortion, but in the case of diamond, its bending rigidity means that the displacement is extremely small, suppressing the noise generated on the diaphragm surface. In particular, its excellent bending rigidity greatly contributed to the realization of the ultra-low distortion DU that we were aiming for. This product uses ``True Diamond'', which manufactures diamond foil by crystallizing diamond on silicon and then melting the silicon.