SPEAKER DIAPHRAGM AND PRODUCTION OF THE SAME

摘要

PURPOSE:To enhance the strength and rigidity of the diaphragm by providing high specific elastic modulus material layers by a vacuum chemical vapor deposition process. CONSTITUTION:A base 28 on which speaker diaphragm substrates 11 are placed is disposed in a reaction furnace 13. Next, hydrogen gas and mixed gases of about 10 are supplied into the reaction furnace 13. Next, a high frequency power source 14 for heating is actuated to form boron B on the speaker diaphragm substrates 11. An even boron B layer 12 is formed on the outside surfaces of the speaker diaphragms by the formation of boron B. The speaker diaphragms having the boron B layer have extremely high modulus of elasticity E and specific elastic modulus E/rho.