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Optical system for the detection of flaws in bottles or the like
| Details |
Inventors: Miyazawa, Takashi;
Assignee: Kirin Beer Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Corbin; John K.
Assistant Examiner: Arnold; Bruce Y.
Attorney, Agent or Firm: Ladas & Parry
In order to enable a laser beam to scan the complete inside surfaces of an empty bottle or the like, two mirrors oscillating about right angular axes are employed which successively reflect the laser beam. The oscillations of the two mirrors are correlated to impart an annular or spiral scanning motion to the laser beam. Subsequently passing through a converging lens, which is focused at the mouth of the bottle being tested, the laser beam enters the bottle for point-by-point scanning of its surfaces. The presence of a flaw in the bottle is sensed from the intensity of the laser beam that has penetrated, or has been reflected from, the bottle, as by an integrating sphere and a photoelectric detector mounted in position thereon. Various other embodiments of the invention and modifications are disclosed. |
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DETAILED DESCRIPTION It is an object of this invention to provide an improved system for accurately detecting all sorts of possible flaws in bottles and other articles.
Another object of the invention is to provide such a system capable of detecting flaws lying not only at the bottom but also on the side wall of a bottle or the like.
A further object of the invention is to provide such a system which correctly responds even to transparent foreign matter sticking to a bottle or the like in any position thereon.
A still further object of the invention is to provide such a flaw detecting system which works even under bright ambient light without loss or diminution of the above noted advantages.
Stated in brief, this invention provides a flaw detecting system comprising means for generating a light beam, means disposed in the path of the light beam for imparting an annular or spiral scanning motion thereto, such that the light beam is enabled to scan all surfaces of an article being held in a preassigned position to be tested as to the presence or absence of a flaw, and means for receiving the light beam that has scanned the article and for sensing a flaw, if any, in the article from the intensity of the incident light.
The flaw detecting system usually employs a laser, such as a gas laser, as the light source.
Various means can be employed to cause the annular or spiral scanning motion of the laser beam.
According to an example of such various possible means disclosed herein, two mirrors capable of successively reflecting the laser beam are arranged for correlated oscillation about respective axes at right angles to each other.
If the article being tested is a beer bottle, for example, with its constricted mouth, then a converging lens may be disposed between the oscillatory mirror system and the bottle lying in the preassigned position.
Focused at the mouth of the bottle, the converging lens serves to direct the laser beam into the bottle so as to enable the beam to scan the bottom as well as the side wall of the bottle point by point
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