Asahi Glass Company, Limited

Yoshiyuki Sonda

Tatsuo Yajima

Munehisa Kato

Kimiaki Oto

Atsushi Kiyama

Kazuhiko Hirata

The present invention provides a quality inspection method of a glass plate, which can predict the shape of the glass based on three types of design shape data C, Cand Cof a glass plate in a state that it is placed on a three-point supporting type actual measurement inspection stand and an actual measurement shape data Yof the glass plate. The virtual errors &#x394;CC&#x2212;C, &#x394;C=C&#x2212;Cand &#x394;YY&#x2212;Cat four supporting points of the glass plate are calculated, the correction amount R=r(C&#x2212;C) or the correction amount R=r(C&#x2212;C) is subtracted from Y&#x2212;Cto calculate a value corresponding to a difference Y&#x2212;A between a shape data Yof the glass on a desired actual measurement inspection stand and a design data A on the desired actual measurement inspection stand, and from the value corresponding to a difference Y&#x2212;A and a quality standard, the quality of the glass plate is judged.

Method for inspecting quality of glass plate

A defect inspection method for a transparent plate material for detecting a bubble, a scratch, a foreign matter, and another defect existing on or in the transparent plate material. The method includes capturing a first image of a main surface of the transparent plate material and capturing a second image of a rear surface of the transparent plate material. A defect candidate is searched for in each of the first and second images. Whether a real image or a virtual image was formed is determined, based on a contrast of an image of a defect candidate obtained by the search. Further, based on an appearance pattern of the real image or the virtual image, a determination is made as to whether the defect candidate is located on the main surface, inside, or on the rear surface of the transparent plate material.

Defect inspection method and apparatus for transparent plate-like members

Shape inspection is carried out without preparing an inspection apparatus for each model of product. There is provided a shape inspection method comprising a first step of placing an object to be measured on an inspection stand for actual measurement, a second step of obtaining information of the surface shape of the object, a third step of calculating shape data of the object in a weightless state based on the information of the surface shape of the object, and a fourth step of recalculating the shape data of the object in a state that the object is placed on a predetermined inspection stand based on the shape data in the weightless state of the object, and judging the quality of the object based on the recalculated shape data of the object.

Shape inspection method and apparatus

A defect inspection method and apparatus for a transparent plate material for detecting a bubble, a scratch, a foreign matter, and another defect existing on or in the transparent plate material including regarding a defect candidate as a defect, when the defect candidate is located in both first and second images, and regarding the defect candidate as a pseudo defect, when the defect candidate is located in only one of the first and second images.

The present invention provides an inspection method and an inspection apparatus which can remove influence of rear surface reflection image and inspect characteristic of a front surface shape with good accuracy by an inexpensive apparatus construction. First of all, as a stripe pattern suitable for a transparent plate-shaped object(object to be inspected), a stripe patternhaving a bright-dark pattern configured so that its reflection image produced by the front surface of the transparent plate-shaped object and its reflection image produced by a rear surface of the transparent plate-shaped object are separated in an image signal obtained by image-capturing, is determined. Thereafter, using the decided stripe patternthe front surface shape of the transparent plate-shaped objectis evaluated by an image analysis using only a reflection image of the stripe patternproduced by the transparent plate-shaped object

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Chiyoda-ku, Japan

Yoshiyuki Sonda