Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
1997-09-18
2001-03-27
Buttner, David (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S196000, C525S201000, C473S378000, C473S385000
Reexamination Certificate
active
06207759
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to an apparatus for measuring dimension, angle, distance, size etc. (defined “dimension” simply hereinafter) of an article and a scale to be used in the same, and more particularly to, an apparatus for improving precision in measuring dimension of an article regardless of a portion of the article to be measured and a scale to be used in the same.
BACKGROUND OF THE INVENTION
A conventional apparatus for measuring dimension of an article is described in the Japanese Patent Publication No. 5-85004 published on Dec. 5, 1993. The conventional apparatus for measuring dimension of an article comprises X- and Y-transparent scale plates having marks for scales, a mount plate for placing a rectangular sheet article to be measured thereon, a light equipment for radiating light to the article placed on the transparent scale plates, and X-, Y- and origin image sensors for receiving light transmitted through the X- and Y-transparent scale plates.
In operation, the rectangular sheet article is placed on the mount plate, such that first and second orthogonal sides of the rectangular sheet article are positioned on inner portions of the X- and Y-transparent scale plates, and a vertex defined by the first and second orthogonal sides is positioned on an inner portion of a crossing area of the X- and Y-transparent scale plates. Then, light is radiated from the light equipment to the X- and Y-transparent scale plates, so that light transmitted through outer portions of the X- and Y-transparent scale plates and an outer portion of the crossing area is received by X-, Y- and origin image sensors. In accordance with output signals of the X-, Y- and origin image sensors, a position of the vertex defined by the first and second orthogonal sides of the rectangular sheet article, and positions of two other vertexes defined by the second side and a third side of the rectangular sheet article, and by the first side and a fourth side of the rectangular sheet article are determined relative to the scales of the X- and Y-transparent scale plates. Consequently, lengths of the first to fourth sides of the rectangular sheet article, lengths of diagonal lines of the rectangular sheet article and vertex angles of the rectangular sheet article are obtained in accordance with the calculation of using the positions of the three vertexes of the rectangular sheet article.
In the conventional apparatus for measuring dimension of an article, however, there are disadvantages in that, for instance, a distance between two arbitrary points on the rectangular sheet article is impossible to be measured, because the positions of the vertexes are detected by using the X- and Y-transparent scale plates, and any pattern defined on the rectangular sheet article can not be measured, even if the pattern is positioned in the vicinity of the first and second sides, because each of the X- and Y-image sensors can not discriminate the pattern from the marks for the scales due to the structure in which the rectangular sheet article is positioned directly on the X- and Y-scale plates.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the invention to provide an apparatus for measuring dimension of an article in which a distance between two arbitrary points on an article can be measured, even if the two points are far from, or off sides or edges of the article, and a scale to be used in the same.
It is a further object of the invention to provide an apparatus for measuring dimension of an article in which marks for a scale and a pattern defined on the article are precisely discriminated from the others to increase precision in measuring the dimension of the article, and a scale to be used in the same.
According to the feature of the invention, an apparatus for measuring dimension of an article, comprises:
a table for placing an article to be measured in dimension thereon;
a scale having marks arranged in matrix;
means for commonly moving the table and the scale;
an image sensor unit for selectively detecting a portion of the article and the marks of the scale corresponding to the portion of the article;
means for providing a relative movement between the table and the image sensor unit; and
a calculation unit for calculating the dimension of the article in accordance with output signals of the image sensor unit.
According to another feature of the invention, a scale to be used in an apparatus for measuring dimension of an article, comprises:
a scale substrata;
marks arranged in matrix on the scale substrat, each of the marks having a width of W and a height of W, and being arranged by a pitch of P
1
, and each of the marks being of a point-symmetrical shape,
wherein the marks meet conditions as defined below,
2
P
1
−W<V,
W<P
1
/2, and
2
P
2
≦W
where V is a view area of an image sensor unit to detect the scale, and P
2
is a pitch of matrix-arranged sensors of the image sensor unit.
REFERENCES:
patent: 3365520 (1968-01-01), Foster
patent: 3789035 (1974-01-01), Iwami et al.
patent: 4526375 (1985-07-01), Nakade
patent: 4801649 (1989-01-01), Statz
patent: 4884814 (1989-12-01), Sullivan
patent: 4956414 (1990-09-01), Muehlenbernd et al.
patent: 5209485 (1993-05-01), Nesbitt
patent: 5274041 (1993-12-01), Yamada
patent: 5281651 (1994-01-01), Arjunan et al.
patent: 5321089 (1994-06-01), Cadorniga et al.
patent: 5397840 (1995-03-01), Sullivan et al.
patent: A 2 625 909 (1989-07-01), None
Research Disclosure 27103-Nov. 1986-E.I. du Pont.
Surlyn Product Brochure.
PCT/US94/03898 (AD-6236) International Search Report dated Nov. 3, 1994.
Fujita Sumio
Hirasawa Eisaku
Iwase Yoshiyuki
Buttner David
E. I. Du Pont de Nemours and Company
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