Diffractive imaging of groove structures on optical tape

A technology of optical strips and grooves, applied in the measurement of scattering characteristics, optical testing of flaws/defects, systems characterized by carrier shape, etc., can solve problems such as not extending to optical strips
CN107110779AActive Publication Date: 2017-08-29ORACLE INT CORP
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Patent Information

Authority / Receiving Office
CN Ā· China
Patent Type
Applications(China)
Current Assignee / Owner
ORACLE INT CORP
Publication Date
2017-08-29

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Abstract

A groove-monitoring system (30) for imaging an optical tape surface (12) is provided. The optical tape surface (12) includes a plurality of groove patterns (18) embossed thereon. The groove-monitoring system includes an optical sensor (32), a first light source (38) directing a first light beam onto the optical tape surface (12) with a first angle of incidence such that the first light beam is directly reflected from the optical tape surface (12) and imaged by the optical sensor (32). The groove-monitoring system (30) also includes a second light source (40) directing a second light beam onto the optical tape surface (12) with a second angle of incidence such that the second light beam is diffracted from the optical tape surface (12) and imaged by the optical sensor (32) as a diffracted light image. The groove-monitoring system (30) is capable of simultaneously making an electronic image of both the groove pattern and the edges (20, 22) of an optical tape (10), in order to ensure that tape edges (20,22) and groove patterns meet parallelism requirements.
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Description

technical field

[0001] In at least one embodiment, the present invention relates to optical storage media, such as optical storage tapes. Background technique

[0002] An optical recording medium is a digital storage medium onto which a pattern is marked and read by light, usually from a laser. Optical data recording media require a grooved structure on which recorded marks are placed. The grooves, or "tracks" as they are called in optical recording, are typically submicron in size and thus nearly impossible to see with a standard optical microscope. For example, a groove with a track pitch of about 320 nanometers presents the necessary surface features to the tracking servo system to allow the tracking servo's laser spot to lock onto the necessary surface features when reading and writing data. The groove structure must have a consistently high quality for the recording system to be reliable. One of the important parameters of the grooves in the ribbon is the height at w...

Claims

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