Definitions

• design information of the optical disc assembly is encoded in the disc assembly.
• FIG. 2 shows a cross-sectional view of an optical stack including three layers of refractive material.
• FIG. 3 is a cross-sectional view of a compact disc recordable (CD-R) including a polycarbonate layer, a dye layer, and a reflective layer.
• CD-R compact disc recordable
• FIG. 36 shows another forward optical disc assembly in which the operational surface has a cut-away area and fluidic channels are placed either above or below the cut-away area.
• the light beam 110 enters layer 104 at surface 112.
• the light beam is bent and slowed because of the refractive property of layer 104.
• the light beam exits layer 104 at surface 114, and then enters layer 106 which has a different refractive property, therefore further altering the angle and speed of the light beam.
• the light beam exits layer 108 at surface 118.
• Surface 112 is laser-proximal to surface 114 which is laser- proximal to surface 116.
• Surface 118 is the most laser-distal surface in the optical stack 102.
• FIG. 10 shows a reverse wobble disc containing an investigational structure.
• the cover 362 acts as a lens to focus the laser beam 364 onto the operational structures.
• the laser beam 364 may also be focused on the investigational structure 366, depending the reflectivity of the investigational structure 366.
• the investigational structure 366 is held in the analyte section 372 which is between the operational layer 370 and the cover layer 362.
• the analyte section 372 lies within the laser's focal zone 368 which also encompasses the operational surface.
• the operational structures are covered by a reflective layer 374.
• the process for manufacturing a reverse wobble disc is different from the process for making an industry standard forward wobble disc.
• FIGs. 11 and 12 demonstrate the difference between making a reverse wobble disc and making a forward wobble disc.
• the surface preferably is coated with a reflective layer, so that the laser beam can be reflected therefrom and then directed by the objective lens 268, the mirror 270 and the quarter wave plate 272 to the beam splitter 266.
• the light is now polarized in a different direction as compared to the source polarization, it can be directed by the beam splitter towards a photodiode detector 274.
• a cylindrical lens 276 may serve as an astigmatic element to introduce astigmatism in the reflected laser beam for the purpose of focusing.
• the focusing servo of the present invention may move the laser's focal point across the laser's focal zone.
• the laser's focal point may represent the point where the focusing servo finds a maximal amount of light returned to the disc reader's detector.
• the location of the laser's focal point therefore may be affected by the reflective properties and other optical properties of various elements contained in the optical disc assembly. For instance, where the optical disc assembly is based on the modification of a conventional CD-R, the focal point may be at the reflective layer which contains gold or other reflective material.
• the pits are shortened or the wobble is changed to provide a lower scanning speed in order to increase the radial resolution.
• the lens layer is changed to PMMA or other material to improve optical response.
• the lens layer may also be made thicker or thinner to make the focal spot smaller or larger, therefore providing higher or lower energy distributions on the detector.
• the operational structures may be interleaved to provide dynamic responses for enhancing imaging.

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• Optical Recording Or Reproduction (AREA)
• Investigating Or Analysing Materials By Optical Means (AREA)

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• 2001
  • 2001-12-07 EP EP01987248A patent/EP1410025A2/de not_active Withdrawn

Non-Patent Citations (2)

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