US 5,311,276 AGranted

Apparatus for detecting cut-edge flaws in glass plates

AssigneeNippon Sheet Glass Co., Ltd.

InventorsIgisu Masao, Yoshiomi Toyota, Shoichi Kondo, Masakazu Fujita, Hideo Kizuka, Kenkichi Sato

Life of this patent

Estimating the term…

Loading patent…

Abstract

An apparatus for detecting flaws generated in the cut edges of cut glass plates is disclosed. The light emitted from a linear light source (11 and 21) and transmitted and reflected by a glass plate (1) is received by a one-dimensional imaging device (12 and 22), and the flaws in the cut edges of the glass plate are detected by a discriminator (13 and 24) based on the output voltage of the one-dimensional imaging device. The linear light source and the one-dimensional imaging device are disposed in such a manner that the longitudinal direction of the linear light source and the arranging direction of the imaging elements of the one-dimensional imaging device are parallel with each other, and that the longitudinal direction of the linear light source and the arranging direction of the imaging elements of the one-dimensional imaging device are oblique to the travelling direction of the glass plate on a plane parallel with the glass plate.

Claims17

Dependent claims

An apparatus for detecting cut-edge flaws in a travelling transparent plate comprising:

a first linear light source disposed on one side of the travelling glass plate, arranged substantially parallel with the transparent plate and obliquely aligned with respect to the travelling direction of the transparent plate;
first one-dimensional imaging means disposed on a second side of the transparent plate and having imaging elements parallel with said first linear light source for detecting light emitted from said first linear light source and transmitted through the transparent plate;
a first discriminator means for identifying flaws and discriminating between flaws in dependance on flaw size in edges of the glass plate based on change in volume of said transmitted light detected by said first one-dimensional imaging means;
a second linear light source disposed on said first side of the travelling glass plate, arranged substantially parallel with the transparent plate and obliquely aligned with respect to the travelling direction of the transparent plate;
a second one-dimensional imaging means disposed on said first side of the transparent plate having imaging elements parallel with said linear light source for detecting light emitted from said linear light source and reflected by the surface of the transparent plate;
and
a second discriminator means for identifying flaws and discriminating between flaws in dependance on flaw size in the edges of the transparent plate and detecting the size of the flaw based on reflected light detected by said second one-dimensional imaging device.

4 more elements

An apparatus for detecting cut-edge flaws in transparent plates comprising:

a first linear light source disposed on any one side of a travelling glass plate, in parallel with glass plate and obliquely with respect to the travelling direction of glass plate;
a first one-dimensional imaging device disposed on the other side of glass plate and the arranging direction of whose imaging elements is parallel with the first linear light source for detecting light emitted from the first linear light source and transmitted through glass plate;
a first discriminator for judging the acceptability of glass plate based on the out put from the first one-dimensional imaging device;
a second linear light source disposed on any one side of glass plate, in parallel with glass plate and obliquely with respect to the travelling direction of glass plate;
a second one-dimensional imaging device disposed on the same side of glass plate as the second linear light source and the arranging direction of whose imaging elements is parallel with the second linear light source for detecting light emitted from the second linear light source and reflected by the surface of glass plate;
and
a second discriminator for judging the acceptability of glass plate based on the output from the second one-dimensional imaging device.

4 more elements

Dependencies are inferred from the claim text.