초록 ▼

The color of gemstones or the like is assessed by projecting light onto the stone, using an interrupting member to regularly interrupt the path of the light shortly before it reaches the stone, the member having a normally white, diffusing interrupting surface, and using a detector for detecting the

The color of gemstones or the like is assessed by projecting light onto the stone, using an interrupting member to regularly interrupt the path of the light shortly before it reaches the stone, the member having a normally white, diffusing interrupting surface, and using a detector for detecting the color of the light coming from the gemstone and from the interrupting surface of the interrupting member. Preferably, the stone is mounted in a chamber having normally white, diffusing internal walls and the diffusing interrupting surface is within the chamber.

대표청구항 ▼

Apparatus for assessing the colour of gemstones and the like, comprising: a chamber having diffusely reflecting internal walls of a colour appropriate to the colour of said gemstones; means for mounting a gemstone in the chamber; means for projecting a converging beam of light onto the stone; an int

Apparatus for assessing the colour of gemstones and the like, comprising: a chamber having diffusely reflecting internal walls of a colour appropriate to the colour of said gemstones; means for mounting a gemstone in the chamber; means for projecting a converging beam of light onto the stone; an interrupting member for regularly interrupting the path of the light beam shortly before it reaches the stone, the member having an interrupting surface which is within the chamber when it interrupts the light path, the interrupting surface being immediately adjacent the position of the gemstone when the interrupting surface interrupts the light path; drive means connected to the interrupting member for driving the interrupting member to regularly interrupt the light path; substantially the entire structure of the interrupting member, and its connection to the drive means, that is within said chamber having diffusely reflecting surfaces of said appropriate colour; and means for detecting the colour of the light diffusely reflected from the internal wall of the chamber when the light path is interrupted and when the light path is not interrupted, the detecting means being arranged so that substantially all light detected has suffered at least one diffuse reflection.