JPH11157048A - Dimension measurement jig for screen plate-making - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dimension measurement jig for measuring the dimension of a given printed pattern formed on a screen with good accuracy. SOLUTION: A dimension measurement jig 10 is constituted of a frame member 24 of the size of locating on the outside of a printed pattern and a supporting plate 26 of a transparent material transmitting light set integrally on the upper section of a frame member 24 and provided on the inner side of a frame 12 of a screen printing plate 11, and the whole of a screen, on which the printed pattern is formed, out of a screen 14 is supported in the flat state bonded with the supporting plate 26 to protect the section from getting loosened, and the dimension of the printed pattern formed on a main body sheet 16 can be measured with high accuracy by using a CCD camera or the like for sending edges optically.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dimension measuring jig used for measuring a dimension of a predetermined print pattern formed on a screen.

[0002]

2. Description of the Related Art For example, substrates for display devices such as substrates for plasma display panels and anode substrates for fluorescent display tubes,
Alternatively, in a substrate for an electronic device such as a thick film wiring board or an image sensor, a film having a predetermined function is provided on the substrate,
For example, a partition, a conductor wiring, a resistor, and the like are provided. These films are formed, for example, by using a screen on which a predetermined pattern is formed, and by scanning a printing paste placed on the screen in one direction, a printing medium positioned at a predetermined plate interval from the screen. This is performed using a thick film screen printing method for printing a predetermined pattern on the surface, that is, the substrate surface.

[0003] In recent years, the above-mentioned substrate has been designed to be multilayered and miniaturized, such as conductors, resistors, and dielectrics, which are patterned on the surface thereof. With the increase in size, it is required to form a fine pattern over a relatively large size. Therefore, before performing the thick film screen printing or every time a predetermined number of shots are printed, the size of the printing pattern formed on the screen is reduced by several μm.
It was necessary to measure with high precision of about several tens of μ.

[0004] The dimension measurement of the print pattern is generally performed by
A screen plate formed by attaching a screen on which a predetermined print pattern is formed to a predetermined frame is placed on a substantially horizontal measuring table, and is disposed above and relatively positioned in a direction parallel to the measuring table. The edge of the print pattern is detected by the edge detecting means moved to the position, and the dimension is measured. The edge detecting means is, for example, a CCD
It is configured to include an imaging device such as a camera, so that the operator can visually check the edge of the print pattern projected on the monitor by transmitted light or reflected light, and measure the dimension from the moving distance of the imaging device etc. The measurement table is made of a transparent material such as glass that transmits light. In addition, the screen is generally fixed to one end surface of the frame, and printing is performed by applying a printing paste to the surface on the frame side, so that when measuring the dimensions, the actual printing side, that is, the surface on the side opposite to the frame body is facing. It is placed on the measurement table in an upright position.

[0005]

However, when the screen plate is placed on the measurement table with the frame body facing downward as described above, the screen floats from the measurement table. It is inevitable that a slight slack occurs due to the weight, and it is difficult to measure the dimensions with high accuracy. In particular, in the case of a large screen plate having a side of 1 m or more or a screen plate used for printing a predetermined number of shots, the above problem becomes conspicuous due to the heavy weight of the screen. In addition, in the case of a combination tension in which a flexible sheet having high flexibility is joined to the outer peripheral side of the main body portion on which a print pattern is formed in order to increase printing accuracy,
Since the screen is easily loosened due to the presence of the soft sheet, the dimension measurement accuracy is also deteriorated.

On the other hand, even if the screen plate is placed on a horizontal measuring table such that the frame body is on the upper side, and the dimension of the print pattern is measured from the upper surface side, that is, the squeegee surface side of the screen, the print surface is There is a slight dimensional difference in the print pattern between the squeegee surface and the squeegee surface due to the thickness of the screen. In addition, in the case of the combination tension, since the main body on which the print pattern is formed rises due to the swelling of the joining portion, it is also difficult to measure the dimensions with high accuracy.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a dimension measurement jig for accurately measuring the dimensions of a predetermined print pattern formed on a screen. To provide tools.

[0008]

According to a first aspect of the present invention, there is provided a screen plate having a screen on which a predetermined printing pattern is formed is attached to a predetermined frame. With the frame being placed on the screen and the screen floating from the measurement table due to the presence of the frame, the edge detection means is disposed above and moved relatively in a direction parallel to the measurement table. When measuring the dimensions by detecting the edge of the print pattern,
A dimension measuring jig for preventing the screen from being loosened, the jig being arranged on the measuring table and inside the frame, and supporting the screen by a support surface parallel to the measuring table. It is characterized by having a support base for preventing loosening.

According to a second aspect of the present invention, there is provided (a) the edge detecting means for detecting an edge based on light transmission in the print pattern portion, wherein the measuring table is made of a transparent material which transmits light. (B) the support is
A frame member of a size located outside the print pattern,
And a support plate made of a transparent material that transmits light integrally provided on an upper portion of the frame member, and an upper surface of the support plate is the support surface.

According to a third invention, there is provided the jig for measuring dimensions of a screen plate according to the second invention, wherein (a) the screen comprises a flexible sheet having a high flexibility on an outer peripheral side of a main body on which the printing pattern is formed. Are joined, and the outer peripheral edge of the soft sheet is attached to the frame by a combination tension fixed to the frame, and (b) the frame member of the support base includes the main body and the soft member. It is characterized in that it is set to a size that is located inside the joint with the sheet and outside the printing pattern.

According to a fourth aspect of the present invention, in the jig for measuring dimensions of a screen plate according to any one of the first to third aspects, the jig is inserted between the support table and the measuring table as necessary. It is characterized by having a plurality of spacers for adjusting the height of the support surface according to the gap size between the measurement table and the screen.

[0012]

According to the first aspect of the present invention, since the support is provided inside the frame of the screen plate and the screen is supported on the support surface to prevent slack, the printing pattern formed on the screen is prevented. Can be measured with high accuracy. In addition, by measuring the dimensions of the print pattern for each predetermined number of shots, the life of the plate making can be accurately determined, and printing errors due to the life are reduced and the yield is improved.

[0013] In the second invention, the support base is a frame member having a size located outside the print pattern, and a support plate made of a transparent material that transmits light and is provided integrally on the frame member. Since the entire portion of the screen on which the print pattern is formed is supported in a flat state in close contact with the support plate, the size of the print pattern is measured using edge detection means for optically detecting edges. Can be measured with high accuracy.

In the third aspect of the invention, the screen is attached to the frame by a combination tension. However, the frame member of the support stand is located inside the joint between the main body on which the printed pattern is formed and the flexible sheet. Because it is positioned outside the print pattern, only the print pattern part is supported in a flat state in close contact with the transparent support plate, and even in screen plate making with a combination that is easy to loosen, the size of the print pattern is determined by the optical edge detection means. Can be measured with high accuracy.

According to the fourth aspect of the present invention, since a plurality of spacers are interposed between the measurement table and the support table, the spacers can be replaced or combined for use in the frame. The height of the support surface can be finely adjusted so that the screen is in a flat state parallel to the measurement table regardless of the dimensional tolerance of the body.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, the support is, for example, a second support.
Although it is composed of a frame member and a support plate as in the invention, it may be composed of a block-shaped member having a thickness substantially equal to the gap between the measurement table and the screen. The shape of the support base is appropriately set according to the shape of the print pattern so that the entire print pattern is supported in close contact with the support surface. A shaped support can also be used. It is also possible to use a support pedestal whose support surface is smaller than the printed pattern and only supports a part thereof.

When optically detecting the edge of the print pattern, it is necessary to use a transparent support such as glass, which transmits light. However, when detecting the edge of the print pattern by another principle, the support is required. Need not be transparent.
The edge detecting means for optically detecting an edge is, for example, C
It is configured to include an imaging device such as a CD camera, so that the operator can visually check the edge of the print pattern projected on the monitor by transmitted light or reflected light, and measure the dimension from the moving distance of the imaging device. However, it is also possible to perform a dimension measurement by automatically detecting an edge from a change in light intensity or the like.

The support surface of the support table needs to be made extremely smooth, and glass is preferably used. However, it is desirable to perform chamfering such as R chamfering on the outer peripheral edge so as not to damage the screen.

The screen plate is placed on a measuring table in such a manner that the printing side of the screen, that is, the surface opposite to the squeeze surface to which the printing paste is applied faces upward, and the size of the printing pattern is measured on the printing side. It is desirable to perform the measurement, but at least when the dimension is measured in a state where the screen is floating from the measurement table by the frame,
The present invention can be applied.

As the flexible sheet of the third invention, for example, a synthetic resin sheet such as tetron is preferably used, and a stainless steel mesh is preferably used for the main body on which the printed pattern is formed. It is also possible to adopt a mesh such as. In addition, inventions other than the third invention can be applied to screen plate making using only a normal mesh other than the combination tension.

As the spacer of the fourth invention, for example, a spacer having substantially the same shape as the shape of the support in plan view is used. However, when an optical edge detecting means is used, it is necessary to use a transparent material such as glass. Alternatively, a spacer having substantially the same shape as that of the frame member of the second invention may be used as long as the material does not transmit light. The plurality of spacers are configured so that, for example, a plurality of types having different plate thicknesses are prepared, and the height is adjusted by replacing or changing the combination. The height may be adjusted.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of a screen plate 11 on which a dimension measuring jig 10 is provided, and FIG. 2 is a sectional view taken along line II-II of FIG. The screen plate 11 includes a frame 12 made of a substantially square light alloy and a screen 14 fixed to one surface of the frame 12 with a predetermined tension using an adhesive such as an epoxy resin. I have.

The screen 14 has a highly flexible synthetic resin sheet 18 such as tetron on the outer peripheral side of the main body sheet 16 and is joined by an adhesive or the like. The outer peripheral edge of the synthetic resin sheet 18 is Is attached to the frame 12 with a combination tension fixed to the frame 12. Reference numeral 20 denotes a joint between the main body sheet 16 and the synthetic resin sheet 18. The main body sheet 16 is a mesh woven as a warp and a weft using, for example, a thin metal wire made of stainless steel or a thin wire made of a synthetic resin such as nylon or polyester. A predetermined printing pattern is formed by a photosensitive resin or the like. ing. Light passes through portions where the print pattern, that is, the print paste passes, but reflects light in other portions. The main body sheet 16 corresponds to the main body portion described in claim 3, and the synthetic resin sheet 18 also corresponds to the soft sheet described in claim 3.

The screen plate 11 is placed on a measuring table 22 of a dimension measuring device (not shown) with the printing side of the screen 14, that is, the surface opposite to the squeeze surface to which the printing paste is applied facing upward. The dimension of the print pattern is measured by the dimension measuring device on the surface on the printing side. The dimension measuring jig 10 is disposed on the measuring table 22 and below the main body sheet 16, and
A frame member 24 of a size that is located inside the outermost region and outside the print pattern, and a light-transmitting transparent material supporting plate 26 provided integrally on the top of the frame member 24; have. The frame member 24 is made of a material such as stainless steel that is not easily deformed and has no backlash with parallelism.
It is made of chamfered glass and has an extremely smooth support surface 28 parallel to the measurement table 22 on the upper surface. The support surface 28 supports the screen 14 to prevent loosening. ing. The height dimension of the dimension measuring jig 10 is determined so that the screen 14 is in close contact with the support surface 28 in a flat plane state without being loosened or lifted. Note that the frame member 24 and the support plate 26 correspond to a support base according to the first aspect.

FIG. 3 is a view for explaining how to measure the dimensions of the screen plate making 11. In the figure, a dimension measuring device (not shown) includes a CCD camera 30, a monitor 32, an operation switch 34, and the like. The CCD camera 30 as an imaging device is equivalent to an edge detecting means for optically detecting an edge, and allows an operator to visually check an edge of a print pattern projected on a monitor 32 by transmitted light or reflected light. , Operation switch 34
By operating the to move the CCD camera 30,
The dimension is measured from the moving distance of the CCD camera 30 and the like. When measuring with transmitted light, the measurement table 22 is made of a transparent material such as glass.
2, light is irradiated upward from below.

According to the present embodiment, the jig 10 for dimension measurement is disposed inside the frame 12 of the screen plate making 11, and the support surface 28 of the jig 10 for the main body sheet 16 of the screen 14 is provided.
Is supported and the slack is prevented, so that the size of the print pattern formed on the main body sheet 16 can be measured with high accuracy. In addition, by measuring the dimensions of the print pattern for each predetermined number of shots, the life of the plate making can be accurately determined, and printing errors due to the life are reduced and the yield is improved.

Further, according to the present embodiment, the dimension measuring jig 10 is provided with a frame member 24 having a size located outside the print pattern and a light integrally provided on the frame member 24. And a support plate 26 made of a transparent material that transmits light. Since the entire portion of the screen 14 where the print pattern is formed is supported in a flat state in which the support plate 26 is in close contact with the support plate 26, the edge is optically edged. The size of the print pattern can be measured with high accuracy by using the CCD camera 30 or the like for detection.

Further, according to the present embodiment, the screen 14
Is attached to the frame body 12 in a combination tension, but the frame member 24 of the dimension measuring jig 10 is inside the joint portion 20 between the main body sheet 16 on which the print pattern is formed and the synthetic resin sheet 18. Since the printing plate is positioned outside the printing pattern, only the printing pattern portion is supported in a planar state in close contact with the transparent support plate 26. The dimensions of the printed pattern can be measured with high accuracy.

Next, another embodiment of the present invention will be described.
In the following embodiments, components having the same configurations as those of the above embodiments are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 4 shows a cross-sectional shape of the screen plate 40 on which the dimension measuring jig 10 is provided. In the figure, the screen plate 40 is the screen plate 1 described above.
The screen 14 is fixed to one surface of another frame 42 having a height larger than that of the first frame 12, and a dimension measurement jig is provided according to a gap between the measurement table 22 and the screen 14. A plurality of spacers 44 are interposed between the frame member 24 of the tool 10 and the measurement table 22, and the support surface 28 of the dimension measurement jig 10 is appropriately supported by the support surface 28. Height is adjusted. Spacer 44
Is a plate-like member having substantially the same shape as the shape of the frame member 24 of the dimension measurement jig 10 in a plan view, and a plurality of types of plates having different plate thicknesses are prepared. Height adjustment is performed.

According to this embodiment, a plurality of spacers 44
Is the frame member 2 of the measuring table 22 and the dimension measuring jig 10
4, the spacers 14 are replaced or used in combination, so that the screen 14 can be connected to the measurement table 22 regardless of the dimensional tolerance of the frame 42 of the screen plate 40. The supporting surface 28 of the dimension measuring jig 10
Height can be finely adjusted.

Although the embodiments of the present invention have been described in detail with reference to the drawings, these embodiments are merely one embodiment, and the present invention is based on the knowledge of those skilled in the art. Can be implemented.

[Brief description of the drawings]

FIG. 1 is a front view of a screen plate on which a dimension measuring jig of the present invention is disposed.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a view for explaining how to measure dimensions of the screen plate making of FIG. 1;

4 is a cross-sectional view of a screen plate making different from FIG. 1 in which the dimension measuring jig of FIG. 1 is provided.

[Explanation of symbols]

 10: Jig for dimension measurement 11, 40: Screen plate making 12, 42: Frame 14: Screen 16: Body sheet (body part) 18: Synthetic resin sheet (Soft sheet) 20: Joint part 22: Measurement table 24: Frame member 26: Support plate 28: Support surface 30: CCD camera (edge detection means) 32: Monitor (edge detection means) 34: Operation switch (edge detection means) 44: Spacer

Claims (4)

[Claims] 1. A screen plate formed by attaching a screen on which a predetermined print pattern is formed to a predetermined frame is placed on a substantially horizontal measuring table, and the screen is measured by the presence of the frame. When measuring the dimension by detecting the edge of the print pattern by edge detection means which is disposed above and is relatively moved in a direction parallel to the measurement table while floating from the table for measurement, A dimension measurement jig for preventing the screen from being loosened, the jig being arranged on the measurement table and inside the frame, supporting the screen by a support surface parallel to the measurement table. A jig for measuring dimensions of a screen plate, comprising a support for preventing loosening. 2. The edge detecting means detects an edge based on light transmission in the print pattern portion. The measurement table is made of a transparent material that transmits light, while the support table is A frame member having a size located outside the print pattern, and a support plate made of a transparent material that transmits light and provided integrally on the top of the frame member, and the upper surface of the support plate is A jig for dimension measurement of a screen plate making, which is the support surface. 3. The screen is a combination of a flexible sheet having a flexible sheet joined to an outer peripheral side of a main body on which the print pattern is formed, and an outer peripheral edge of the flexible sheet fixed to the frame. Attached to the frame, the frame member of the support base is set to a size that is located inside the joint between the main body and the flexible sheet and outside the print pattern. 3. The jig for measuring dimensions of screen plate making according to claim 2, wherein 4. The height of the support surface is interposed between the support table and the measurement table as necessary, and the height of the support surface is adjusted according to a gap between the measurement table and the screen. The jig for dimension measurement of screen plate making according to any one of claims 1 to 3, further comprising a plurality of spacers.