| 摘要 |
The disc unit (10) has frame (11) that is arranged on two circumferential sides of disc plate (12). Two profile portions are formed in frame. The strength of primary profile portion with hard component is greater than that of secondary profile portion with soft component. The primary profile portion is injection-molded at the edge region of disc plate. The primer is formed on the disc plate with respect to the secondary profile portion which partially surrounds primary profile portion. |
