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A Gradient Heating Device and Method for Improving the Uniformity of 0.1mm Cover Layer of Blu-ray Disc

A gradient heating, Blu-ray disc technology, applied in the direction of optical record carrier, optical record carrier manufacturing, etc., can solve the problems of glue coating thickness variation, uneven cover layer thickness, pull back, etc., to improve uniformity and solve cover layer Inhomogeneity, the effect of eliminating the influence of peak covering

Inactive Publication Date: 2011-11-30
上海拓引数码技术有限公司
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Problems solved by technology

[0004] The traditional spin-coating method itself is a relatively complicated process technology, especially the so-called edge peaking protrusions (such as Figure 9 shown)
Generally, the spinning glue and UV curing of the spin coating machine are carried out in two stages, so the adhesive glue cannot be cured by ultraviolet light in time after spinning the glue, because the glue has a certain viscosity and elastic resistance, it will produce glue that has not yet been set. The phenomenon of coating causes the thickness of the glue coating to change, resulting in uneven thickness of the formed covering layer, and there are smears, especially at the edge of the disc

Method used

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  • A Gradient Heating Device and Method for Improving the Uniformity of 0.1mm Cover Layer of Blu-ray Disc
  • A Gradient Heating Device and Method for Improving the Uniformity of 0.1mm Cover Layer of Blu-ray Disc
  • A Gradient Heating Device and Method for Improving the Uniformity of 0.1mm Cover Layer of Blu-ray Disc

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Embodiment Construction

[0019] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0020] According to the present invention, in the process of forming the 0.1mm cover layer of a BD Blu-ray disc, such as figure 1 As shown, the Blu-ray disc substrate 4 is first placed on the tray 7 in the spin coating bowl 6 of the spin coating machine 5 . In the first stage, at first glue is coated on the inner circle 8 of this disc substrate 4, and glue down can be carried out by a manipulator 9, and this manipulator 9 removes after coating glue; Then in the second stage, spin coating The machine starts to rotate so that the disc substrate 4 rotates together, and the glue is evenly rotated and coated on the disc substrate. With the rotation of the disc substrate, the glue spreads from the inner ring to the outer ring under the action of centrifugal force, and gradually covers the entire surface. CD substrate. The...

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Abstract

The invention relates to a gradient heating device and method for improving the uniformity of the 0.1mm cover layer of a Blu-ray disc. There are two rows of heating lamp tubes, and the heating lamp tubes are configured to generate a heating temperature gradient that gradually increases from the inside to the outside. The invention combines spin coating and gradient heating together to eliminate the influence of peak covering caused by the elastic shrinkage of the glue, and improves the unevenness of the covering layer caused by the viscosity of the glue on the inner and outer rings of the optical disc during the glue coating process.

Description

technical field [0001] The invention relates to a gradient heating device and method for improving the uniformity of the 0.1mm covering layer of a Blu-ray disc. Background technique [0002] In order to pursue larger capacity and cooperate with high NA value to ensure extremely low disc tilt error, BD Blu-ray Disc completely breaks away from the 0.6mm+0.6mm design of DVD disc in the disc structure, and adopts a new 1.1mm substrate+0.1mm The structure of the overlay. However, the 0.1mm cover layer specifications are prone to spherical aberration caused by thickness errors. We also found that, in addition to the allowable error limit of tilt, in the focus depth (focus accuracy and depth error index, the smaller the value, the higher the requirement. susceptible to interference), cover layer thickness error and dust noise indicators are closely related to the design and production of 0.1mm cover layer. At present, what bothers everyone about BD Blu-ray discs is the uniformity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/26
Inventor 宋国旗郑飞璠夏芃
Owner 上海拓引数码技术有限公司
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