To provide a base plate with a slit shape which performs a noise preventing function effectively without reducing the strength of the base plate as much as possible.
Slits formed in the base plate made of a disc-like base metal 6 is composed of a first slit 2a which is formed with a zigzag kerf with the swing width thereof larger than a groove interval toward the innermost circumferential side from the outermost circumferential side of the base metal and has a slender tongue piece made of the zigzag kerf and a second slit 2b which is formed at the innermost circumferential side of the first slit, formed with the zigzag kerf with the swing width thereof larger than the groove interval toward the innermost circumferential side from the outermost circumferential side of the base metal while having the slender tongue piece made of the zigzag kerf. The kerf on the outermost circumferential side of the second slit is formed on the tongue piece on the innermost circumferential side of the second slit and the slits are filled with resins.
YAMAZAKI SHIGEKAZU
KAWANISHI MAKOTO
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