초록 ▼

A rotary head assembly having a central stationary shaft one end of which is securely joined to a lower housing, a bearing spacer securely fitted over the stationary shaft at the other end thereof and a rotary sleeve disposed for rotation about the common axis of the stationary shaft and the bearing

A rotary head assembly having a central stationary shaft one end of which is securely joined to a lower housing, a bearing spacer securely fitted over the stationary shaft at the other end thereof and a rotary sleeve disposed for rotation about the common axis of the stationary shaft and the bearing spacer, whereby a hydraulic bearing is defined by the bearing spacer, the rotary sleeve and a lubricant filled into the space between the bearing spacer and the rotary sleeve, and a hydraulic passage is defined between the stationary shaft and the rotary sleeve. The lower end of the lubricant passage is provided with a magnetic sealing means which seals a magnetic liquid so as to prevent the leakage to the exterior of the magnetic liquid or the lubricant. An upper cylinder which carries one or more video signal recording and reproducing heads is removably mounted on the rotary sleeve.

대표청구항 ▼

A rotary head assembly for a magnetic recording and reproducing device, comprising: (a) a central stationary shaft having one end thereof securely joined to a main body of said assembly, and another free end, said main body comprising a lower housing and a lower cylinder having a cylindrical surface

A rotary head assembly for a magnetic recording and reproducing device, comprising: (a) a central stationary shaft having one end thereof securely joined to a main body of said assembly, and another free end, said main body comprising a lower housing and a lower cylinder having a cylindrical surface coaxial with said upper cylinder; (b) a rotary sleeve disposed within said main body and extending into said lower cylinder for rotation about the common axis of said stationary shaft; (c) an upper cylinder mounted on said rotary sleeve around the periphery thereof, adjacent one end of said lower cylinder, and carrying one or more video signal magnetic recording and reproducing heads, the diameter of said upper cylinder being substantially equal to the diameter of said cylindrical surface of said lower cylinder; (d) a hydraulic bearing means defined by upper portions of said stationary shaft and said rotary sleeve, and a lubricant filled in the space between said upper portions of said stationary shaft and said rotary sleeve; (e) a lubricant passage defined between lower portions of said stationary shaft and said rotary sleeve and in communication with said hydraulic bearing means; and (f) a magnetic sealing means disposed within said lower housing at the lower end of said lubricant passage.