News Column

Patent Issued for Cover for an Optical Disc Drive and Optical Disc Drive Having the Same

May 27, 2014



By a News Reporter-Staff News Editor at Journal of Technology -- A patent by the inventors Jung, Dong-ha (Yongin-si, KR); Hwang, Bo-won (Suwon-si, KR); Roh, Min-shik (Seoul, KR); Park, Byung-yeob (Suwon-si, KR); Kim, Se-yoon (Seoul, KR); Jung, Ji-won (Yongin-si, KR); Ha, Min-seok (Seoul, KR), filed on February 24, 2012, was published online on May 13, 2014, according to news reporting originating from Alexandria, Virginia, by VerticalNews correspondents.

Patent number 8726301 is assigned to Toshiba Samsung Storage Technology Korea Corporation (Suwon-si, KR).

The following quote was obtained by the news editors from the background information supplied by the inventors: "The following description relates to a cover that suppresses fluttering of a disc that rotates at a high speed in a housing, and an optical disc drive that includes the cover.

"In an optical disc drive, a strong air flow is generated inside a small space between a disc that rotates at a high speed and a top cover covering the disc. The strong air flow causes the disc to vibrate, and is generated in a complex manner based on rotation of the disc. In other words, air flows in a spiral shape due to a Coriolis effect at a surface of the disc and an effect of a viscous flow at a boundary layer, and air flows along an inner surface of the top cover toward a center portion of the disc where pressure is decreased.

"The rotation of the disc, which causes such a complex air flow, generates an interaction between the disc and air. For example, the motion of the disc changes the flow of air, and the changed flow of air deforms the disc. Such an interaction increases as a speed of the disc increases. The interaction between the disc and the air causes the disc to flutter.

"Fluttering of the disc deteriorates the stability of the disc. Severe fluttering of the disc may make it impossible to access the disc (i.e., to read and write data).

"A pressure structure formed on the top cover increases rigidity of the top cover, thereby suppressing vibration of the top cover due to the air flow. However, the pressure structure affects the air flow in the small space between the disc and the top cover, and thus, needs to be suitably designed."

In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventors' summary information for this patent: "In one general aspect, there is provided a cover for an optical disc drive. The cover includes a body having a top portion that is configured to cover a disc if the disc is inserted into the optical disc drive, and a pressure structure that is formed on the body and that has an asymmetrical shape.

"The body may include a disc clamper corresponding to a spindle on which the disc is installed when the disc inserted into the optical disc drive.

"The body may include at least a side portion corresponding to a main frame of the optical disc drive, and wherein the pressure structure is formed on the top portion of the body.

"The pressure structure may have a symmetrical shape with respect to at least one of: (i) a first direction parallel to the disc if the disc is inserted into the optical disc drive, and (ii) a second direction which is perpendicular to the first direction.

"The pressure structure may have a symmetrical shape with respect to at least one of: (i) a first direction parallel to the disc if the disc is inserted into the optical disc drive, and (ii) a second direction perpendicular to the first direction. The pressure structure may have an asymmetrical shape with respect to another direction.

"The pressure structure may have a tetragonal shape on a plane of the body.

"The pressure structure may have a bottom surface sunk toward the disc if the disc is inserted into the optical disc drive, and the bottom surface may be tilted toward a top surface of the disc if the disc is inserted into the optical disc drive.

"The bottom surface may be flat.

"The pressure structure may include at least one side wall having an asymmetrical height that is formed around the bottom surface. The bottom surface may be flat.

"The pressure structure may have an asymmetrical shape around a center portion of the disc.

"In another aspect, there is provided a cover for an optical disc drive. The cover includes a body covering a disc installed onto a spindle of an optical disc drive, and the body comprising: (i) a top portion comprising a disc clamper corresponding to the spindle, and (ii) a side portion corresponding to a main frame of the optical disc drive; and a pressure structure formed on the top portion, the pressure structure having an asymmetrical shape with respect to a center portion of the disc, and having a symmetrical shape with respect to at least one of a first direction parallel to the disc and a second direction which is perpendicular with respect to the first direction.

"The pressure structure may have a tetragonal shape on a plane of the body.

"The pressure structure may have a bottom surface sunken toward the disc, wherein the bottom surface is tilted toward a top surface of the disc.

"In another aspect, there is provided an optical disc drive. The optical disc drive includes a main frame having installed thereto (i) a spindle motor onto which a disc is installed, and (ii) an optical pickup, and a cover operatively combined with the main frame. The cover may include a body covering the disc, and a pressure structure that is formed on the body and that has an asymmetrical shape.

"The body may include a disc clamper corresponding to the spindle.

"The body may include a top portion on which the pressure structure is formed, and a side portion corresponding to a side of the main frame.

"The pressure structure may include a symmetrical shape with respect to at least one of a first direction parallel to the disc and a second direction perpendicular to the first direction.

"The pressure structure may include a bottom surface that is sunken toward the disc, and the bottom surface is tilted toward a top surface of the disc.

"The pressure structure may include at least one side wall having an asymmetrical height that is formed around the bottom surface. The bottom surface may be flat.

"The pressure structure may include a bottom surface sunken toward the disc, and the bottom surface may be tilted toward a top surface of the disc.

"The pressure structure may include at least one side wall having an asymmetrical height that is formed around the bottom surface. The bottom surface may be flat.

"In another aspect, there is provided a cover for an optical disc drive. The cover includes a body having a top portion that is configured to cover a disc if the disc is inserted into the optical disc drive, and a pressure structure that is formed on the body. The pressure structure is configured such that a distance between a top surface of the disc and a bottom surface of cover is different between at least one set of opposing sides of the top surface of the disc.

"Other features and aspects may be apparent from the following detailed description, the drawings, and the claims."

URL and more information on this patent, see: Jung, Dong-ha; Hwang, Bo-won; Roh, Min-shik; Park, Byung-yeob; Kim, Se-yoon; Jung, Ji-won; Ha, Min-seok. Cover for an Optical Disc Drive and Optical Disc Drive Having the Same. U.S. Patent Number 8726301, filed February 24, 2012, and published online on May 13, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=14&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=651&f=G&l=50&co1=AND&d=PTXT&s1=20140513.PD.&OS=ISD/20140513&RS=ISD/20140513

Keywords for this news article include: Toshiba Samsung Storage Technology Korea Corporation.

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Source: Journal of Technology


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