WO2016084978A1

WO2016084978A1 - Wiring-board production method, data correction device, wiring-pattern formation system, and data correction method

Info

Publication number: WO2016084978A1
Application number: PCT/JP2015/083605
Authority: WO
Inventors: 哲平山本; 中山　肇; 荻野　晴夫; 聡磯田
Original assignee: 日立化成株式会社
Priority date: 2014-11-28
Filing date: 2015-11-30
Publication date: 2016-06-02
Also published as: JP2017063169A; JP2017062452A; JP6690204B2; WO2016084977A1; JP6801955B2

Abstract

A step (C) for generating, on the basis of the difference between original data and actual pattern data, correction data for the original data or exposure data is provided with: a step (C-1) in which difference data is generated from the difference between the actual pattern data and the original data; a step (C-2) in which a plurality of correction functions defining the relationship between the cause of the difference and the original-data correction amount or the exposure-data correction amount for suppressing the difference are generated from the relationship between the difference data and the cause of the difference; and a step (C-3) in which a correction function obtained by synthesizing the plurality of correction functions is generated.

Description

Wiring board manufacturing method, data correction apparatus, wiring pattern forming system, and data correction method

The present invention relates to a method for manufacturing a wiring board, a data correction apparatus, a wiring pattern forming system, and a data correction method, and more particularly to manufacturing a wiring board used for manufacturing a wiring board having a fine circuit used in an electronic device or the like. The present invention relates to a method, a data correction apparatus, a wiring pattern forming system, and a data correction method.

Due to the trend toward higher functionality and miniaturization of electronic devices, higher density is required for wiring boards used in electronic devices by thinning the wiring pattern.

As a wiring pattern forming method to cope with such high density by thinning the wiring pattern, a direct drawing type exposure apparatus (directly irradiating a photosensitive resist with laser light, UV-LED light, etc.) Combine DI (Direct Imaging) and an optical inspection device (AOI :: Automatic Optical Inspection) that reads the actual pattern actually formed by etching etc. with reflected light and compares it with the original data (design data). There has been considered a method in which actual finished data after etching is taken into an inspection apparatus (AOI) and fed back to an exposure apparatus (DI) (Patent Documents 1 to 3).

JP 2005-116929 A JP 2006-303229 A JP 2007-033764 A

However, there are a number of factors that change the pattern width. Even if the production lot changes, such as variations due to pattern shape, density, etc., there is a factor that remains constant to some extent for products with the same wiring pattern. Even if the product is the same, there are also factors that vary from one production lot to another due to a change in the state of the production process. For this reason, the conventional wiring pattern forming methods such as Patent Documents 1 to 3 may not be able to suppress fluctuations in the wiring pattern width. For this reason, the conventional method of feeding back data from an inspection apparatus (AOI) has not been very effective for improving the precision of a fine circuit.

For this, for example, a method of feeding back inspection data of an inspection apparatus (AOI) of an actual pattern substrate produced in advance for each production lot is conceivable, but the inspection data of the inspection apparatus (AOI) is enormous. Therefore, there is a problem that it takes a long time to process the data to be fed back. In addition, it is conceivable to reduce the inspection data of the actual pattern substrate produced in advance for each production lot and speed up the data processing. However, if the inspection data is reduced, the influence is exerted when irregular data is included. However, there is a problem that the state of the manufacturing process at the time of manufacturing the actual pattern substrate cannot be correctly reflected, and the accuracy is lowered.

The present invention has been made in view of the above problems, and in addition to fluctuations in the line width of the wiring pattern depending on the wiring pattern specifications such as pattern gap, pattern size, pattern thickness, pattern position, etc., photosensitive resist, development The line width accuracy at the time of microcircuit formation can be increased by correcting the exposure data with higher accuracy to cope with fluctuations in the line width of the wiring pattern due to changes in the state of the manufacturing process such as solution and etching solution. The purpose is to improve.

The present invention relates to the following.
(1) A step (A) of creating exposure data based on the original data of the target wiring pattern, a step (B) of creating actual pattern data from an actual pattern substrate formed using this exposure data, (C) creating correction data of the original data or exposure data based on the difference between the original data and the actual pattern data, and the step (C) of creating the correction data includes the actual pattern The difference between the data and the original data or exposure data (C-1), and the relationship between the difference data and the factor causing the difference, the factor causing the difference and the difference are suppressed. A step (C-2) of creating a plurality of correction functions defining a relationship between the correction amount of the original data or the correction amount of the exposure data for performing the correction, and a correction function combining the plurality of correction functions A method of manufacturing a wiring board, comprising: a step of creating a number (C-3); and a step of correcting original data or exposure data of the wiring pattern using the combined correction function (C-4).
(2) In the step (C-2) of creating the plurality of correction functions, a primary correction function created using an actual pattern substrate and a secondary correction function created using another actual pattern substrate are In the step (C-3) of creating and combining the combined correction function, a step of generating a tertiary correction function by combining the primary correction function and the secondary correction function to correct the original data or exposure data (C In 4), the wiring board original method or the exposure data of the real pattern board is corrected using the cubic correction function.
(3) In the step (C-2) of creating the plurality of correction functions, separately from the secondary correction function, another secondary correction function created using another actual pattern substrate is created, Item 3. The step (C-3) of creating the synthesized correction function creates the other third-order correction function by synthesizing the third-order correction function and the other created second-order correction function. A method for manufacturing a wiring board.
(4) In the step (C-2) of creating the plurality of correction functions, the actual pattern substrate used to create the primary correction function and other actual functions used to create other secondary correction functions are used. Item 4. The method for manufacturing a wiring board according to Item 2 or 3, wherein the pattern board or another actual pattern board has the same wiring pattern.
(5) In the step (C-2) of creating the plurality of correction functions, another secondary correction function created after the secondary correction function is generated for each production lot of the actual pattern substrate or for each actual pattern substrate. Item 5. The method for manufacturing a wiring board according to any one of Items 2 to 4, which is created.
(6) Factors that cause a difference between the actual pattern data and the original data or exposure data include the pattern gap, pattern size, pattern thickness, and pattern position of the original data or exposure data of the wiring pattern of the actual pattern substrate. Item 6. The method for manufacturing a wiring board according to any one of Items 1 to 5, which is any one or a combination of any two or more.
(7) As a factor causing a difference between the actual pattern data and the original data or exposure data, the pattern gap, pattern size, pattern thickness, pattern position of the original data or exposure data of the wiring pattern of the actual pattern substrate Item 7. The method for manufacturing a wiring board according to Item 6, wherein actual pattern data corresponding to any one or a combination of any two or more is used.
(8) A data correction apparatus for wiring pattern original data or exposure data used in the method for manufacturing a wiring board according to any one of items 1 to 7, wherein the original data of the target wiring pattern or the original data Difference data is created from the difference between the exposure data created based on the data and the actual pattern data created from the actual pattern substrate formed using the exposure data (C-1), and the difference data and the difference are A plurality of correction functions defining the relationship between the factor causing the difference and the correction amount of the original data or the correction amount of the exposure data for suppressing the difference are created from the relationship with the factor to be generated (C -2) A correction function obtained by combining the plurality of correction functions is created (C-3), and the original data of the wiring pattern corrected using the correction function created by combining the plurality of correction functions Alternatively, a data correction apparatus that creates correction data for exposure data (C-4).
(9) When creating a plurality of correction functions (C-2), a primary correction function created using an actual pattern substrate and a secondary correction function created using another actual pattern substrate are When creating the combined correction function (C-3), a tertiary correction function is generated by combining the primary correction function and the secondary correction function, and the original data or exposure data is corrected (C In 4), the data correction apparatus according to item 8, wherein the original data or exposure data of the wiring pattern of the actual pattern substrate is corrected using the cubic correction function.
(10) When creating the plurality of correction functions (C-2), in addition to the secondary correction function, another secondary correction function created using another actual pattern substrate is created. When the combined correction function is created (C-3), the tertiary correction function is combined with the other secondary correction function generated to generate another tertiary correction function. The data correction apparatus described.
(11) When creating the plurality of correction functions (C-2), the actual pattern substrate used to create the primary correction function and other secondary correction functions used to create other secondary correction functions Item 11. The data correction device according to Item 9 or 10, wherein the actual pattern substrate or another actual pattern substrate has the same wiring pattern.
(12) When creating the plurality of correction functions (C-2), another secondary correction function created after the secondary correction function is set for each production lot of real pattern substrates or for each real pattern substrate. Item 12. The data correction neglected according to any one of Items 9 to 11, which is created by
(13) Factors causing a difference between the actual pattern data and the original data or exposure data are the pattern gap, pattern size, pattern thickness, and pattern position of the original data or exposure data of the wiring pattern of the actual pattern substrate. Item 13. The method for manufacturing a wiring board according to any one of Items 8 to 12, which is any one or a combination of any two or more.
(14) As a factor causing a difference between the actual pattern data and the original data or exposure data, the pattern gap, pattern size, pattern thickness, pattern position of the original data or exposure data of the wiring pattern of the actual pattern substrate Item 14. The method for manufacturing a wiring board according to Item 13, wherein actual pattern data corresponding to any one or a combination of any two or more is used.
(15) Based on the data correction apparatus according to any one of Items 8 to 14, and exposure data created from original data corrected by the data correction apparatus or exposure data corrected by the data correction apparatus A pattern exposure device that exposes an exposure pattern to a photosensitive resist disposed on a substrate, a development pattern forming device that develops the photosensitive resist exposed to the exposure pattern to form a development pattern, and the development pattern A wiring pattern forming system comprising: an actual pattern forming apparatus that forms a real pattern by performing circuit processing on the substrate on which the circuit pattern is formed; and an actual pattern data generating apparatus that generates actual pattern data from the actual pattern.
(16) A data correction method for wiring pattern original data or exposure data using the data correction device according to any one of items 8 to 14, wherein the original wiring pattern original data or the original data A step (C-1) of creating difference data from the difference between the exposure data created based on the actual pattern data created from the actual pattern substrate formed using the exposure data, and the difference data and the difference A step of creating a plurality of correction functions defining a relationship between a factor causing the difference and a correction amount of the original data or a correction amount of the exposure data for suppressing the difference from a relationship with the factor to be generated ( C-2), a step (C-3) of creating a correction function by combining the plurality of correction functions, and a correction function using the correction function generated by combining the plurality of correction functions. And a step (C-4) of creating correction data of the original data of the wiring pattern or the exposure data.

According to the present invention, in addition to fluctuations in the line width of the wiring pattern due to the wiring pattern specifications such as the pattern gap, pattern size, pattern thickness, pattern position, etc., the state of the manufacturing process of the photosensitive resist, developer, etching solution, etc. It is possible to improve the line width accuracy when forming a fine circuit by correcting the exposure data with higher accuracy to cope with the fluctuation of the line width of the wiring pattern due to the change.

The manufacturing method of the wiring board of one Embodiment of this invention is shown. The wiring pattern (test pattern) used by one Embodiment of this invention is shown. The schematic of the real pattern board | substrate A used by one Embodiment of this invention is shown. The schematic of the real pattern board | substrate B used by one Embodiment of this invention is shown. The schematic of the real pattern board | substrate C used by one Embodiment of this invention is shown. The linear correction function produced in one Embodiment of this invention is shown. The secondary correction function created in one embodiment of the present invention is shown. 3 shows a cubic correction function created in an embodiment of the present invention. The other secondary correction function and other tertiary correction function which were produced in one embodiment of the present invention are shown. The block diagram of the data correction apparatus of one Embodiment of this invention is shown. The schematic of the wiring pattern formation system of one Embodiment of this invention is represented. The primary correction function of Examples 1 and 2 is shown. The secondary correction function of Example 1 and 2 is shown. The third order correction function of Examples 1 and 2 is shown. The other secondary correction function of Example 1 and 2 is shown. 6 shows another third-order correction function of the first embodiment. The other cubic correction function of Example 2 is shown.

(Manufacturing method of wiring board: first embodiment)
<<< Process (A) >>>
A method for manufacturing a wiring board according to the first embodiment of the present invention will be described. As shown in FIG. 1, the method for manufacturing a wiring board according to the present embodiment first includes a step (A) of creating exposure data based on original data of a target wiring pattern. The target wiring pattern is a wiring pattern to be formed as an actual pattern after circuit processing, and includes a product pattern for functioning as a wiring board and a test pattern for creating a correction function described later. The actual pattern is a wiring pattern of an actual pattern substrate that is actually formed by performing circuit processing. The target wiring pattern is not particularly limited, and any wiring pattern can be used.

The original data of the wiring pattern is the design data of the target wiring pattern, and the target wiring pattern to be formed is quantified and expressed by, for example, numerical values of coordinates and pattern widths and coordinates and pattern gaps. is there. You may have the data to which the information required for exposure was added. The original data is created using a device (CAD: Computer Aided Design) that creates design data.

Exposure data refers to data for forming an exposure pattern corresponding to a wiring pattern by exposing a photosensitive resist to pattern exposure means such as a linear drawing apparatus using laser light or UV light. The exposure data is created using a device (CAM: Computer Aided Manufacturing) that creates exposure data based on the original data.

<<< Process (B) >>>
Next, as shown in FIG. 1, the method for manufacturing a wiring board according to the present embodiment includes a step (B) of creating actual pattern data from the actual pattern board formed using the exposure data. The process (B) for creating actual pattern data includes a pattern exposure process (B-1), a development pattern formation process (B-2), an actual pattern formation process (B-3), and a pattern inspection process (B-4). Have.

<Process (B-1)>
In the pattern exposure step (B-1), using the exposure data, the exposure pattern corresponding to the wiring pattern is exposed to a photosensitive resist by a pattern exposure apparatus such as a linear drawing apparatus using laser light or UV light. Form. Here, the pattern exposure apparatus refers to an exposure apparatus that exposes an exposure pattern to a photosensitive resist disposed on a substrate based on exposure data. Examples of the pattern exposure apparatus include a direct drawing apparatus (DI: Direct Imaging) that directly exposes an exposure pattern to a photosensitive resist using laser light or UV-LED light. The photosensitive resist refers to an etching resist or a plating resist used for forming a wiring pattern by etching a metal foil such as a copper foil or plating a metal such as copper by a photolithography method. . An exposure pattern refers to a pattern exposed to a photosensitive resist based on exposure data, and corresponds to a development pattern formed by subsequent development.

<Process (B-2)>
In the development pattern formation step (B-2), the photosensitive resist is removed while leaving an exposure pattern formed by pattern exposure and necessary for actual pattern formation. Here, the development pattern refers to a pattern that appears by developing the photosensitive resist after exposure. The developing pattern forming apparatus may be a developing apparatus that develops a photosensitive resist having an exposed exposure pattern to form a developing pattern.

<Process (B-3)>
In the actual pattern forming step (B-3), circuit processing is performed to manufacture an actual pattern substrate having an actual pattern. Here, the circuit processing refers to forming an actual pattern, and includes, for example, forming a conductor pattern by etching a metal foil by a subtract method. The actual pattern refers to a conductor pattern that is actually formed by performing circuit processing, and can be formed by an actual pattern forming apparatus. The actual pattern forming apparatus refers to an apparatus that forms a real pattern by performing circuit processing on a substrate on which a development pattern is formed, and includes an etching apparatus.

<Process (B-4)>
In the pattern inspection step (B-4), actual pattern data is acquired from the actual pattern on the actual pattern substrate. Here, the actual pattern substrate means a substrate having a conductor pattern (actual pattern) actually formed by performing circuit processing, for example, a substrate having a conductor pattern obtained by etching a metal foil by a subtract method. Is mentioned. The actual pattern data refers to finished data obtained from an actual pattern using an optical appearance inspection apparatus (AOI: Automatic Optical Inspection), a measurement microscope, or the like. The optical appearance inspection apparatus generally detects light reflected from the upper surface (top) of an actual pattern, digitizes the pattern, and sets the data as numerical values such as coordinates, pattern width, and pattern gap. . On the other hand, the measurement microscope in this embodiment can be used to measure and convert the line width of both the upper surface (top) of the actual pattern and the bottom surface (bottom) of the actual pattern. .

<< Step (C) >>
Next, the wiring pattern forming method of the present embodiment includes a step (C) of creating correction data of the original data or exposure data based on the difference between the original data or exposure data and the actual pattern data. ing. Here, the correction data of the original data or exposure data refers to original data or exposure data after correction, that is, corrected original data or exposure data. Further, as shown in FIG. 1, in the step (C) for creating the correction data, a step (C-1) for creating difference data from the difference between the actual pattern data and the original data or exposure data, and this difference A step of creating a plurality of correction functions defining a relationship between a factor causing a difference and a correction amount of original data or a correction amount of exposure data for suppressing the difference from a relationship between the data and a factor causing the difference ( C-2), a step of creating a correction function by combining the plurality of correction functions (C-3), and a step of correcting the original data or exposure data of the wiring pattern using the combined correction function (C-4) )have.

In circuit processing by etching, the manner in which the etching solution hits differs between the front and back surfaces of the actual pattern substrate, so the tendency of the etching process changes. Therefore, it is desirable to create a correction function for each of the front and back surfaces of the actual pattern substrate. This makes it possible to suppress variations in the finished value such as the line width of the actual pattern due to the difference between the front and back surfaces of the actual pattern substrate.

In addition, in circuit processing by etching, even in one of the front and back surfaces of the actual pattern board, the relationship with the direction of the wiring pattern changes with the direction of transport of the actual pattern board, the direction of contact with the etching solution, etc. There is a tendency that unevenness in directionality and etching amount occurs in the etching process. For this reason, the tendency of an etching process changes also with the direction of the wiring pattern arrange | positioned on a real pattern board | substrate. Therefore, it is desirable to create a correction function for each of the vertical and horizontal wiring patterns arranged on the actual pattern substrate. This makes it possible to suppress variations in the finished value such as the line width of the actual pattern depending on the direction of the wiring pattern.

Also, in circuit processing by etching, the relationship between the transfer direction of the actual pattern substrate and the direction in which the etching solution hits changes depending on the position of the wiring pattern, even within one of the front and back surfaces of the actual pattern substrate. Therefore, the etching process tends to have uneven directionality and etching amount. For this reason, it is desirable to divide the in-plane of the actual pattern substrate into a plurality of regions and create a correction function for each of these regions. In particular, in the periphery of the edge of the actual pattern substrate, in addition to the unevenness of the etching process, unevenness in the thickness of the copper foil due to variations in the plating thickness is also added. In the section, it is desirable to divide the area more finely and create a correction function for each area. As a result, it is possible to suppress variations in the finished value such as the line width of the actual pattern due to the position in the plane of the actual pattern substrate.

<Process (C-1)>
In the step (C-1) of creating difference data from the difference between the actual pattern data and the original data or exposure data, the actual pattern data obtained in the pattern inspection step (B-4) is compared with the original data or exposure data. From this, differential data is created. Here, the difference between the actual pattern data and the original data or exposure data of the actual pattern is specifically the pattern gap, pattern width, etc. between the actual pattern data and the actual pattern original data or exposure data at the same coordinates. The difference. The same coordinates are the same coordinates in the original data (design data), and the pattern gaps and the like are the same design values at the same coordinates. For this reason, a difference in pattern gaps or the like at the same coordinates indicates a difference obtained by comparing portions having the same design value in the wiring pattern. The difference data refers to data representing this difference by coordinates, pattern gaps, pattern widths, and the like. The difference data can be created using a computer from the difference between the actual pattern data and the original data of the actual pattern or the exposure data.

<Process (C-2)>
In the step (C-2) of creating a plurality of correction functions, the correction amount of the original data for suppressing the difference or the exposure data A plurality of correction functions that define the relationship with the correction amount are created. Here, the factor causing the difference between the actual pattern data and the original data or the exposure data is that the actual pattern data and the original data or the exposure are changed by the fluctuation in the wiring pattern specification of the original data or the exposure data. A factor that causes a change in the difference from data. As such factors, for example, the original data of the actual pattern or the pattern gap of the exposure data, the pattern width, the pattern size, the pattern thickness, the pattern position, or any combination of two or more thereof can be cited. Further, as the correction amount of the original data or the exposure data for suppressing the difference, for example, the difference itself between the actual pattern data and the original data or exposure data of the actual pattern can be used. This is because if the correction is made such that the difference between the actual pattern data and the original data or exposure data of the actual pattern is added to or subtracted from the current original data or exposure data, the actual pattern data approaches the value of the original data or exposure data. It is because.

The correction function defines the relationship between the factor causing the difference and the correction amount of the original data or exposure data for suppressing the difference from the relationship between the factor causing the difference and the difference data. The correction function is a computer having a calculation function for obtaining a relationship between a factor causing a difference and a correction amount of the original data or exposure data for suppressing the difference from a relationship between the factor causing the difference and the difference data. Can be created. As an example of the correction function, FIG. 6 shows an example in which the correction function is created using the pattern gap of the wiring pattern of the actual pattern substrate as a factor that causes the difference between the actual pattern data and the original data or the exposure data. That is, in the correction function of FIG. 6, the horizontal axis represents the pattern gap of the wiring pattern of the actual pattern substrate, and the vertical axis represents the correction amount.

As a factor that causes the difference between the actual pattern data and the original data or exposure data in the correction function, any of the pattern gap, pattern size, pattern thickness, and pattern position of the original data or exposure data of the wiring pattern of the actual pattern substrate Alternatively, it is desirable to use actual pattern data corresponding to any combination of two or more.

This will be described below using an example of the correction function shown in FIG. In the correction function of FIG. 6, the horizontal axis is the pattern gap of the wiring pattern of the actual pattern substrate. Examples of data used as the numerical value of the pattern gap include the original data of the wiring pattern of the actual pattern substrate, the exposure data, Real pattern data can be considered. Among these, when using original data or exposure data, the correction function indicates the relationship between the original data or exposure data of the pattern gap and the correction amount for the original data or exposure data, and the correction amount is the actual pattern data and the original data. Alternatively, since it is based on the difference data with the exposure data, even in this case, it is possible to obtain a correction amount that is somewhat accurate with respect to the original data or exposure data of the pattern gap.

However, in this case, the correction amount with respect to the original data or the exposure data is based on the difference data when the actual pattern data (finished value) is different from the original data (design value), and is actually obtained. Since the actual pattern data (finished value) is finished as the original data (design value), that is, the correction amount for matching the original data (design value) and the actual pattern data (finished value) It is conceivable that there is a deviation from the correction amount based on the difference data when the actual pattern data (finished value) is different from the original data (design value).

On the other hand, when the actual pattern data (actual measurement value) is used as the numerical value of the pattern gap of the wiring pattern of the actual pattern substrate used on the horizontal axis of the correction function in FIG. 6, the correction function is the actual pattern data (actual measurement value) of the pattern gap. And the correction amount with respect to the original data or exposure data. The original data (design value) on the horizontal axis or the actual pattern data (measured value) corresponding to the exposure data can be regarded as the target original data (design value) or exposure data. Value) is a correction amount for obtaining target original data (design value) or exposure data. Thereby, the correction amount of the original data (design value) or the exposure data required when the actual pattern data (actual measurement value) is finished according to the target original data (design value) or the exposure data is set more accurately. It becomes possible.

The correction function is a factor that causes a change in the difference between the actual pattern data and the original data or the exposure data, which is a wiring pattern in which the pattern gap, pattern width, pattern size, pattern thickness, pattern position, etc. are changed. It can create using the some real pattern board | substrate which has. As a wiring pattern used to create a correction function, a wiring pattern used as a product of a wiring board can be used. However, as shown in FIG. 2, factors that cause a difference (in FIG. 2, a pattern gap, a pattern It is desirable to use a test pattern in which the width, pattern shape, and pattern size) are changed, because necessary data can be easily obtained and a correction function with higher accuracy can be created.

Further, as shown in FIG. 3, an actual pattern substrate (hereinafter referred to as a test pattern substrate) is used in which a large number of relatively small area test patterns having the same wiring pattern are arranged in the actual pattern substrate. In addition, it is desirable in that data relating to the same wiring pattern specification can be acquired over the entire actual pattern substrate, and data relating to variations in the actual pattern substrate can also be acquired.

In the present embodiment, in the step (C-2) of creating a plurality of correction functions as a plurality of correction functions, a primary correction function created using an actual pattern substrate and another actual pattern substrate are used. The created secondary correction function is created. Here, the other actual pattern substrate means an actual pattern substrate different from the actual pattern substrate when the primary correction function is created, and the wiring pattern itself may be the same or different. Absent. In this way, by creating the primary correction function and the secondary correction function separately, for example, using the actual pattern substrate on which the test pattern is arranged, the reference primary correction function is created and actually created. At the timing of manufacturing the actual pattern board on which the product pattern to be placed is prepared, a secondary correction function that reflects the state of the production line at that time is created again using another actual pattern board, and then these primary corrections are made. A function and a quadratic correction function can be synthesized. That is, based on the primary correction function serving as a reference, correction to a more appropriate correction function according to the production line situation can be performed using the secondary correction function.

It is desirable that the actual pattern substrate used to create the primary correction function and the other actual pattern substrate used to create another secondary correction function have the same wiring pattern. A plurality of correction functions may be created using a plurality of actual pattern substrates having the same wiring pattern or a plurality of actual pattern substrates having different wiring patterns, but the former is corrected. It is desirable in that the accuracy of the function can be increased. For example, as shown in FIGS. 3, 4, and 5, the actual pattern substrate A (FIG. 3), the actual pattern substrate B (FIG. 4), and the actual pattern substrate C (FIG. 5) have the same test pattern. Thus, even if the wiring pattern of other portions changes, it is possible to always create a correction function using the same test pattern portion.

In the step (C-2) of creating a plurality of correction functions, it is preferable that the secondary correction function is created for each production lot of the actual pattern substrate or for each actual pattern substrate. This makes it possible to create a correction function that reflects the state of the manufacturing process when manufacturing an actual pattern substrate.

<Process (C-3)>
In the step (C-3) of creating a correction function by combining a plurality of correction functions, a single correction function is created by combining the plurality of correction functions created in the step (C-2) of generating a plurality of correction functions. To do.

In this embodiment, a tertiary correction function is created by synthesizing the primary correction function and the secondary correction function. For example, as shown in FIG. 6, first, a primary correction function serving as a reference is created using an actual pattern substrate. Next, as shown in FIG. 7, an actual pattern substrate different from the primary correction function is used. The secondary correction function is used to create a secondary correction function, and as shown in FIG. 8, the primary correction function and the secondary correction function are combined to create a tertiary correction function. In other words, since the primary correction function as a reference is always fixed, a stable tertiary correction function can be obtained, so that the secondary correction function created for each lot of actual pattern substrates or for each actual pattern substrate is measured. Even if errors or irregular measured values are included, the influence can be reduced.

As a method of combining a plurality of correction functions, when the state of the manufacturing process is relatively stable, a weighted average obtained by increasing the combination ratio of correction functions created using a larger amount of data is used. Desirable for accuracy improvement. For example, a primary correction function using a large amount of difference data is created as a reference correction function, and then compared as a secondary correction function that reflects the state of the manufacturing process when an actual pattern substrate is manufactured. When creating a secondary correction function using a small amount of difference data and combining these primary correction function and secondary correction function, increase the combination ratio of the primary correction function as a reference to increase the measurement error. And the effects of irregular data can be suppressed. On the other hand, when the state of the manufacturing process is relatively unstable, in the above example, it is possible to obtain an appropriate correction function that reflects the state of the manufacturing process more by increasing the composite ratio of the secondary correction function. it can. In this way, the composition ratio at the time of the weighted average may be arbitrarily set according to the number of difference data when creating the correction function, the state of the manufacturing process, etc. On the other hand, it is desirable to set the ratio in the range of 0.1 to 0.4 as long as it is a composite ratio of the primary correction function serving as a reference and the secondary correction function created when the actual pattern substrate is manufactured. On the other hand, for relatively unstable manufacturing processes, the composite ratio of the primary correction function used as a reference and the secondary correction function created when manufacturing the actual pattern substrate is set in the range of 0.3 to 0.7. It is desirable to do. Here, the composition ratio refers to the ratio of the secondary correction function when the total of the primary correction function and the secondary correction function is set to 1.

<Process (C-4)>
In the step (C-4) of correcting the original data or exposure data of the wiring pattern using the combined correction function, a difference is generated in the difference between the actual pattern data and the original data or exposure data using the combined correction function. By calculating the correction amount corresponding to the pattern gap, pattern width, etc., which are factors to be added, and adding or subtracting the obtained correction amount to the original data or exposure data, the original data or exposure data of the wiring pattern is obtained. to correct.

In this embodiment, in the step (C-4) of correcting the original data or the exposure data, the original data or the exposure data of the wiring pattern of the actual pattern substrate is corrected using a tertiary correction function.

(Action / Effect)
According to the wiring board manufacturing method of the present embodiment, a plurality of correction functions are synthesized in this way to create a basic primary correction function and cope with variations in the manufacturing process. Even when creating a secondary correction function with less data than one correction function at the same time as the pattern substrate is manufactured, the effects of measurement errors and irregular measurement values can be reduced. An appropriate correction function reflecting the situation can be obtained. For this reason, it is suitable when the state of the production process hardly changes due to an increase in the number of production and the like and is relatively stable. Therefore, in addition to fluctuations in the line width of the wiring pattern depending on the wiring pattern specifications such as pattern gap, pattern size, pattern thickness, pattern position, etc., the wiring pattern due to changes in the state of the manufacturing process such as photosensitive resist, developer, etching solution, etc. The line width accuracy at the time of forming a fine circuit can be improved by correcting the exposure data with higher accuracy to cope with the fluctuation of the line width.

(Manufacturing method of wiring board: second embodiment)
A method for manufacturing a wiring board according to a second embodiment of the present invention will be described. In addition, about this Embodiment, a different point from 1st Embodiment is mainly demonstrated.

<Steps (A), (B), (C-1)>
In the present embodiment, as in the first embodiment, first, steps (A), (B), and (C-1) are performed, and difference data is created from the difference between the actual pattern data and the original data. To do.

<Process (C-2)>
In the step (C-2) of creating a plurality of correction functions, a primary correction function created using an actual pattern substrate and a secondary correction function created using another actual pattern substrate are created. Thereafter, apart from the secondary correction function, another secondary correction function created using another actual pattern substrate is created.

<Process (C-3)>
Next, in a step (C-3) of generating a correction function by combining a plurality of correction functions, a tertiary correction function by combining the primary correction function and the secondary correction function is generated. After that, this tertiary correction function and another secondary correction function further created in the step (C-2) are combined to create another tertiary correction function.

Specifically, for example, as shown in FIG. 6, first, a primary correction function is created using an actual pattern substrate, and then, as shown in FIG. 7, an actual pattern substrate different from this primary correction function. Is used to create a secondary correction function, and as shown in FIG. 8, a primary correction function and a secondary correction function are synthesized to generate a tertiary correction function. Further, as shown in FIG. 9, a secondary correction function is further created and combined with the tertiary correction function to create another tertiary correction function. In other words, since the third-order correction function is obtained by repeatedly accumulating the second-order correction function and the composition, the second-order correction function produced for each actual pattern substrate production lot or each actual pattern substrate has measurement errors and irregularities. Even if the measurement value is included, the influence can be reduced.

(Action / Effect)
According to the method for manufacturing a wiring board of the present embodiment, another secondary correction that is newly created every time a real pattern board is manufactured with respect to a tertiary correction function that combines a primary correction function and a secondary correction function. By synthesizing the function, another cubic correction function is created. In other words, since the tertiary correction function used for correcting the original data or exposure data is a cumulative result of the secondary correction function, the manufacturing process status tends to fluctuate in a specific direction due to the accumulation of production numbers, etc. It is suitable when there is. Therefore, it is possible to obtain the same operation and effect as in the first embodiment, and it is possible to perform more stable correction in such a case.

(Data Correction Device: Third Embodiment)
A data correction apparatus according to the third embodiment of the present invention will be described. As shown in FIG. 10, the data correction apparatus of the present embodiment uses a computer, and the computer includes a processing unit (processor), a display unit, an input unit, a storage unit, a communication unit, and each of these components. It has a bus for connecting parts. The display unit displays an image output by a program executed on the computer. The input unit accepts input, and is, for example, a keyboard or a mouse. The storage unit can store information such as a nonvolatile memory, a volatile memory, and a hard disk. The storage unit stores data such as original data, exposure data, actual pattern data, difference data, correction function, correction data, and the process up to correcting the original data or exposure data (correction data creation process (C) in FIG. 1). ) Is stored. The communication unit performs wireless communication or wired communication using a USB cable or the like. Original data, exposure data, actual pattern data, difference data, and the like may be acquired via the communication unit. When the correction program is executed, the processing unit (processor) executes a process for correcting original data or exposure data (correction data creation process (C) in FIG. 1). The data correction apparatus does not need to be a general-purpose computer, and may be realized by hardware for executing all or a part of each process and software operating in cooperation therewith.

As shown in (C-1) of the data creation step (C) in FIG. 1, the data correction apparatus of the present embodiment is the original data of the target wiring pattern or the exposure data created based on this original data. And difference data is created from the difference between the actual pattern data created from the actual pattern substrate formed using the exposure data.

Next, as shown in (C-2) of FIG. 1 (C) data creation step, the factor causing the difference and the original data for suppressing the difference from the relationship between the difference data and the factor causing the difference. A plurality of correction functions defining the relationship between the correction amount and the exposure data correction amount are created. As an example of the correction function, FIG. 6 shows an example in which the correction function is created using the pattern gap of the wiring pattern as a factor that causes a difference between the actual pattern data and the original data or the exposure data. That is, in the correction function of FIG. 6, the horizontal axis represents the pattern gap of the wiring pattern, and the vertical axis represents the correction amount.

In this embodiment, when creating a plurality of correction functions (C-2), a primary correction function created using an actual pattern substrate and another actual pattern substrate are used as the plurality of correction functions. And a quadratic correction function created in the above manner. In this way, by creating the primary correction function and the secondary correction function separately, for example, using the actual pattern substrate on which the test pattern is arranged, the reference primary correction function is created and actually created. At the timing of manufacturing the actual pattern board on which the product pattern to be placed is created, a secondary correction function that reflects the current production line status is created again using another actual pattern board, and then these primary corrections are made. A function and a quadratic correction function can be synthesized. That is, based on the primary correction function serving as a reference, correction to a more appropriate correction function according to the production line situation can be performed using the secondary correction function.

Next, as shown in (C-3) of the data creation step (C) in FIG. 1, a correction function is created by combining the plurality of correction functions.

In this embodiment, a tertiary correction function is created by synthesizing the primary correction function and the secondary correction function. For example, as shown in FIG. 6, first, a primary correction function serving as a reference is created using an actual pattern substrate. Next, as shown in FIG. 7, an actual pattern substrate different from the primary correction function is used. The secondary correction function is used to create a secondary correction function, and as shown in FIG. 8, the primary correction function and the secondary correction function are combined to create a tertiary correction function. Thereby, since the primary correction function serving as a reference is always fixed, a stable tertiary correction function can be obtained, so the secondary correction function produced for each production lot of the actual pattern substrate or for each actual pattern substrate is Even if measurement errors and irregular measurement values are included, the influence can be reduced.

Next, as shown in (C-4) of the (C) data creation step in FIG. 1, the correction of the wiring pattern original data or the exposure data corrected using the correction function created by combining a plurality of correction functions. Create data.

In this embodiment, when correcting the original data or the exposure data (C-4), the original data or the exposure data of the wiring pattern of the actual pattern board is corrected using a tertiary correction function.

When creating a plurality of correction functions (C-2), the actual pattern substrate used to create the primary correction function and another actual pattern substrate used to create other secondary correction functions or Further, it is desirable that other actual pattern substrates have the same wiring pattern. A plurality of correction functions may be created using a plurality of actual pattern substrates having the same wiring pattern or a plurality of actual pattern substrates having different wiring patterns, but the former is corrected. It is desirable in that the accuracy of the function can be increased. For example, as shown in FIGS. 3, 4, and 5, the actual pattern substrate A (FIG. 3), the actual pattern substrate B (FIG. 4), and the actual pattern substrate C (FIG. 5) have the same test pattern. Thus, even if the wiring pattern of other portions changes, it is possible to always create a correction function using the same test pattern portion.

When creating a plurality of correction functions (C-2), another secondary correction function created after the secondary correction function is created for each production lot of the actual pattern substrate or for each actual pattern substrate. Is desirable. This makes it possible to create a correction function that reflects the state of the manufacturing process when manufacturing an actual pattern substrate.

(Action / Effect)
According to the data correction apparatus of the present embodiment, in the same manner as in the first embodiment, in addition to the variation in the line width of the wiring pattern due to the wiring pattern specifications such as the pattern gap, the pattern size, the pattern thickness, and the pattern position, the photosensitivity Lines at the time of microcircuit formation can be dealt with by correcting exposure data with higher accuracy even for fluctuations in the line width of wiring patterns due to changes in the state of manufacturing processes such as resist, developer, and etchant. The width accuracy can be improved.

(Data Correction Device: Fourth Embodiment)
A data correction apparatus according to the fourth embodiment of the present invention will be described. In addition, about this Embodiment, a different point from 1st Embodiment is mainly demonstrated.

The data correction apparatus according to the present embodiment has the configuration shown in FIG. 10 as with the data correction apparatus according to the third embodiment described above.

Further, when creating a plurality of correction functions (C-2), in addition to the secondary correction function, another secondary correction function created using another actual pattern substrate is created and synthesized. When creating the correction function (C-3), the third-order correction function is combined with the other second-order correction function created to create another third-order correction function.

(Action / Effect)
According to the data correction apparatus of the present embodiment, the same operation and effect as those of the third embodiment can be obtained, and the tertiary correction function used for correcting the original data or the exposure data is obtained by repeatedly accumulating the secondary correction function. Therefore, more stable correction can be performed when the state of the manufacturing process tends to fluctuate in a specific direction due to the accumulation of the number of productions.

(Wiring pattern forming system: fifth embodiment)
A wiring pattern forming system according to a fifth embodiment of the present invention will be described. As shown in FIG. 11, the wiring pattern forming system of the present embodiment first has a data correction device. As in the third or fourth embodiment, a computer is used as the data correction apparatus. The computer includes a processing unit (processor), a display unit, an input unit, a storage unit, a communication unit, and each of these components. It has a bus to be connected.

Next, pattern exposure for exposing the exposure pattern to the photosensitive resist arranged on the substrate based on the exposure data created from the original data corrected by the data correction device or the exposure data corrected by the data correction device Have the device. In the present embodiment, the substrate means a substrate having a metal foil such as copper foil or copper plating on an insulating layer such as glass epoxy, and examples thereof include a copper clad laminate. A pattern exposure apparatus refers to an exposure apparatus that exposes an exposure pattern to a photosensitive resist disposed on a substrate based on exposure data. Examples thereof include a direct drawing apparatus (DI: Direct Imaging) that directly exposes an exposure pattern on a photosensitive resist using laser light or UV-LED light.

Next, it has a development pattern forming apparatus for developing a photosensitive resist having an exposed exposure pattern to form a development pattern. An example of the development pattern forming apparatus is a development apparatus used in photolithography.

Next, there is an actual pattern forming apparatus that forms a real pattern by performing circuit processing on the substrate on which the development pattern is formed. Examples of the actual pattern forming apparatus include an etching apparatus and a plating apparatus used in circuit processing of a wiring board.

Next, an actual pattern data creation device for creating actual pattern data from the actual pattern is provided.
Examples of the actual pattern data creation device include an optical appearance inspection device (AOI: Automatic Optical Inspection), a measurement microscope, and the like. The optical appearance inspection apparatus detects light reflected from the upper surface (top) of an actual pattern, digitizes the pattern, and sets the data as numerical values such as coordinates, pattern width, and pattern gap. On the other hand, the measurement microscope can be used to measure the line width and convert it into data for either the upper surface (top) or the lower surface (bottom) of the actual pattern.

In the wiring pattern forming system of the present embodiment, the data correction device receives the actual pattern data from the actual pattern data creation device, and as shown in FIG. 1, from the difference between the actual pattern data and the original data or exposure data. Difference data is created (C-1), and the relationship between the factor causing the difference and the correction amount of the original data or the correction amount of the exposure data for suppressing the difference from the relationship between the difference and the factor causing the difference (C-2), a correction function obtained by synthesizing the plurality of correction functions is created (C-3), and the original data or exposure data of the wiring pattern is generated using the synthesized correction function. Is corrected (C-4).

(Action / Effect)
According to the wiring pattern forming system of the present embodiment, in the same manner as in the first embodiment, in addition to fluctuations in the line width of the wiring pattern due to the wiring pattern specifications such as pattern gap, pattern size, pattern thickness, pattern position, etc. The exposure data can be corrected with higher accuracy to cope with fluctuations in the line width of the wiring pattern due to changes in the state of the manufacturing process such as the resist, developer, and etchant. Line width accuracy can be improved.

(Data Correction Method: Sixth Embodiment)
A data correction method according to the sixth embodiment of the present invention will be described. The data correction method of the present embodiment uses the data correction neglect shown in FIG. 10, and as shown in the correction data creation step of FIG. 1, the original data of the target wiring pattern or the original data A step (C-1) of creating difference data from the difference between the exposure data created based on the actual pattern data created from the exposure pattern and the actual pattern substrate formed using the exposure data, and the difference data and the difference Creating a plurality of correction functions defining the relationship between the factor causing the difference and the correction amount of the original data or the correction amount of the exposure data for suppressing the difference from the relationship with the factor causing the difference (C-2), a step (C-3) of creating a correction function by combining the plurality of correction functions, and the arrangement corrected using the correction function generated by combining the plurality of correction functions. It has a step (C-4) for creating correction data of the original data or exposure data pattern.

Hereinafter, the present invention will be described based on examples, but the present invention is not limited to the examples.

(Example 1)
<Create primary correction function>
First, in order to create a primary correction function, a thickness of 0.22 mm having a copper foil of 5 μm on the front and back of an insulating layer as a substrate for producing an actual pattern substrate C4c on which the test pattern 1 and the product pattern 7 are arranged. On the copper foil of the copper clad laminate of MCL-E-700G (trade name, manufactured by Hitachi Chemical Co., Ltd., “MCL” is a registered trademark) having a length of 440 mm and a width of 510 mm, an electroplating of about 9 μm is applied. What prepared the total copper thickness of each surface of front and back about 14 micrometers was prepared. Next, a photosensitive etching resist is laminated on the copper foils on the front and back surfaces, the product pattern 7 and the test pattern 1 in FIG. 2 are exposed, and a circuit is formed by etching using a horizontal conveyance type etching apparatus. Nine real pattern substrates C4c as shown in FIG. The original data (design value) of the test pattern shown in FIG. 2 is a linear wiring in which the pattern width (width of pattern 3) is fixed at 100 μm and the pattern gap 2 is changed in 24 steps within the range of 14 to 150 μm. The patterns are arranged in the vertical and horizontal directions for each of the front and back surfaces, and the initial exposure data created based on this original data is the same as the original data (design value). FIG. 5 shows an outline of the actual pattern substrate C4c. In the present embodiment, actually, in addition to the product pattern 7, there are 11 test patterns 1 in the vertical direction, 11 in the horizontal direction, and 121 in total. Were evenly arranged in the front and back surfaces of the actual pattern substrate C4c.

Actual pattern data (finished value) was obtained for the actual pattern substrate C4c using an optical automatic visual inspection apparatus. The number of measurement points at this time is one for each of the vertical and horizontal linear wiring patterns for each test pattern. For this reason, in each of the front and back surfaces of the actual pattern substrate C4c, 121 points each for the linear wiring patterns in the vertical direction and the horizontal direction, and a total of 9 points is 1089 points for each surface for the linear wiring patterns in the vertical direction and the horizontal direction. Next, the actual pattern data (finished value) and the original data (design value) for each pattern gap at the same coordinates of the test pattern 1, that is, where the pattern gap has the same design value, The difference data was created. Here, the actual pattern data (finished value) is obtained as 1089 points (121 points per sheet) of actual pattern data (finished value) for each surface for each of the 24 pattern gaps. (For every 121 points).

In circuit processing by etching, even in one of the front and back surfaces of the actual pattern substrate, the relationship with the transport direction of the actual pattern substrate, the direction of contact with the etching solution, etc. changes depending on the position of the wiring pattern. In the etching process, the directionality and the etching amount tend to be uneven. In particular, in the peripheral portion of the end portion of the actual pattern substrate, in addition to the unevenness of the etching process, the unevenness of the thickness of the copper foil due to the variation of the plating thickness is added, so this tendency is further strong. For this reason, in this embodiment, the surface of the actual pattern substrate is divided into a plurality of regions, and the region around the edge portion is divided more finely than the center portion of the actual pattern substrate. A correction function was created. Specifically, out of 121 points of actual pattern data arranged evenly in the plane of the actual pattern substrate, 42 points in total, 2 points from the center portion of the actual pattern substrate and 40 points from the peripheral portion of the end portion, are selected. Thus, a correction function was created for each of these points. Below, it demonstrates using 1 point of the center part of a real pattern board | substrate among 42 points.

Also, in circuit processing by etching, the manner in which the etchant is applied differs between the front and back surfaces of the actual pattern substrate, so the tendency of the etching process changes. For this reason, in this embodiment, a primary correction function was created for each of the front and back surfaces of the actual pattern substrate. However, in the following, only the front side (the upper side when forming a circuit by etching in horizontal conveyance) The explanation is omitted, and the explanation of the back side is omitted.

Furthermore, in circuit processing by etching, even in one of the front and back surfaces of the actual pattern substrate, the relationship with the direction of the wiring pattern, the direction of transport of the actual pattern substrate, the direction of contact with the etchant, etc. There is a tendency that directionality and unevenness occur in the etching process. For this reason, in this embodiment, a primary correction function is created for each of the linear wiring patterns in the vertical and horizontal directions of the test pattern. However, only the horizontal direction will be described below, and the description of the vertical direction will be omitted.

Next, the relationship between the difference data and the pattern gap, which is a factor causing the difference, is examined, and the primary correction as shown in FIG. 12 is performed as the relationship between the pattern gap and the correction amount of the original data for suppressing the difference. Created a function.

The design value (unit: μm) of the pattern gap shown in the table of FIG. 12 is a numerical value of the pattern gap (factor causing the difference) of the original data of the test pattern. The finished value (unit: μm) of the pattern gap is an actual measurement value of the pattern gap acquired from actual pattern data using an optical automatic visual inspection apparatus. The one-side correction amount (unit: μm) is the exposure data correction amount for suppressing the difference between the finished value of the pattern gap and the original data, and was obtained by the following equation (1). Here, the one-side correction amount is used to correct the same amount on both sides of the pattern gap when correcting the exposure data.
One-side correction amount (μm) = (finish value of pattern gap (μm) −design value (μm)) / 2 (1)

<Exposure data correction using a primary correction function>
The correction processing to the exposure data of the product pattern 7 using the primary correction function is performed, for example, in the exposure data of the product pattern 7 where the finished value of the pattern gap in the table of FIG. From the data of 28.5 μm (one-side correction amount is 4.3 μm) and the finished value is 33.2 μm (one-side correction amount is 5.6 μm), the value of the one-side correction amount when the finished value is 30 μm is It was obtained by calculation on the assumption that it was on a straight line connecting the data. When the finished value of the pattern gap obtained in this way is 30 μm, the one-side correction amount is 4.7 μm, and is for exposure data (here, it means initial exposure data and is the same as the original data). Correction processing for narrowing the pattern gap by 4.7 μm on one side was performed. In other words, the exposure data after the pattern gap correction processing is set to 20.6 μm at the portion where the design data (design value) of the pattern gap of the product pattern 7 is 30 μm.

At this time, the exposure data of the product pattern 7 (here, the initial exposure data means the same as the original data) is subjected to a correction process using the primary correction function created above, and the exposure data of the test pattern 1 The correction process was not applied to. For test pattern 1, an actual pattern is always created using the same exposure data as when the primary correction function was created, and actual pattern data for creating the secondary correction function is collected.

<Creation of secondary correction function>
Next, in order to create a secondary correction function, a substrate similar to that for creating the primary correction function is prepared, and an actual pattern substrate C4c in which the test pattern 1 and the product pattern 7 as schematically shown in FIG. One piece was produced. The test pattern 1 uses the same design data as that used to create the primary correction function, and the product pattern 7 has design data having locations where the design value of the pattern width / pattern gap is 30 μm / 30 μm. It is. FIG. 5 shows an outline of the actual pattern substrate C4c. In the present embodiment, a total of 42 test patterns 1 are actually arranged in the actual pattern substrate C4c. The positions of 42 test patterns 1 arranged in the actual pattern substrate C4c in the actual pattern substrate C4c are 42 points in the actual pattern substrate C4c used to create the primary correction function shown in FIG. This corresponds to the position of the test pattern 1.

Next, actual pattern data (finished value) was obtained for the actual pattern substrate C4c using an optical automatic visual inspection apparatus. The number of measurement points at this time is 42 points. Further, here, among the linear wiring patterns in which the pattern gap 2 of the test pattern of FIG. 2 is changed in 24 steps within the range of 14 to 150 μm, as shown in the table of FIG. 13, 20, 30, 45, Actual pattern data was acquired only for six stages of 60, 80, and 130 μm. Next, for each of the six stages of pattern gaps, the actual pattern data is averaged for every 42 points, and this averaged actual pattern data is used to create a primary correction function, as shown in FIG. A quadratic correction function as shown in FIG. The pattern gap 2 at other stages was obtained by calculation assuming that the pattern gap 2 was on a straight line connecting the actual pattern data of the pattern gap 2 at the stage where the actual pattern data was obtained. That is, although not shown in the table of FIG. 13, actual pattern data was actually acquired only for six stages, and based on this, the actual pattern data for all 24 stages were estimated. As a result, the actual pattern data to be acquired is reduced and the data processing load is reduced.

<Creating third-order correction function>
Next, assuming that the combination ratio (ratio) of the correction amount by the primary correction function in the correction amount by the primary correction function and the correction amount by the secondary correction function is 0.5, 0.7, 0.3, the tertiary correction function It was created. FIG. 14 shows a case where the composition ratio (ratio) of correction amounts by the primary correction function is 0.5. Specifically, when the composition ratio (ratio) of the correction amounts by the primary correction function is 0.5, the composition ratio (ratio) of the correction amounts by the secondary correction function is 0.5. The one-side correction amount was synthesized by the following equation (2).
One-sided correction amount (μm) of tertiary correction function = one-sided correction amount (μm) of primary correction function × 0.5
+ Secondary correction function one-side correction amount (μm) × 0.5 (2)
Here, the one-side correction amount data at the time of creating the secondary correction function is obtained only for the pattern gaps in six steps, which is smaller than the 24 steps at the time of creating the primary correction function. It was estimated by calculation so as to obtain data for the same 24 stages as when the primary correction function was created.

<Correction of exposure data using cubic correction function>
The correction process to the exposure data of the product pattern 7 using the tertiary correction function includes, for example, a combination ratio (ratio) of the correction amount by the primary correction function to the correction amount by the primary correction function and the correction amount by the secondary correction function. In the case of 0.5, in the exposure data of the product pattern 7, with respect to the place where the design value is 30 μm, the finished value of the pattern gap in the table of FIG. 14 is 26.8 μm (one-side correction amount is 3.4 μm). From each data with a finishing value of 31.0 μm (one-side correction amount is 4.5 μm), it is assumed that the one-side correction amount value when the finishing value is 30 μm is on a straight line connecting these data. Obtained by calculation. When the finished value of the pattern gap thus obtained by calculation is 30 μm, the one-side correction amount is 4.2 μm, and exposure data (in this case, it means initial exposure data, not corrected exposure data, (Same as the data.) Correction processing for narrowing the pattern gap by 4.2 μm on one side was performed. In other words, the exposure data after the pattern gap correction processing is set to 21.6 μm at the portion where the design data (design value) of the pattern gap of the product pattern 7 is 30 μm. Further, a tertiary correction function used for correcting the original data or exposure data of a product pattern (not shown) arranged on the actual pattern substrate C4c is created using the test pattern 1 having the closest positional relationship to each product pattern. A cubic correction function was used.

At this time, the third-order correction function created above is used for the exposure data of the product pattern 7 (here, the initial exposure data means the same as the original data) as in the case of creating the second-order correction function. Thus, the correction process is performed, and the exposure data of the test pattern 1 is not subjected to the correction process. For test pattern 1, an actual pattern is always created using the same exposure data as when the primary correction function was created, and the actual pattern data for creating the secondary correction function thereafter is collected.

<Creation of actual pattern substrate for evaluation>
Next, in order to create a real pattern substrate for evaluation, a real pattern in which the test pattern 1 and the product pattern 7 as schematically shown in FIG. Three substrates C4c were produced. Note that the exposure data of the product pattern 7 (here, not the corrected exposure data but the initial exposure data means the same as the original data) is subjected to a correction process using the tertiary correction function created above. The exposure data for test pattern 1 was subjected to exposure by creating exposure data that was not subjected to correction processing.

(Comparative Example 1)
Three real pattern substrates C4c mixed with the test pattern 1 and the product pattern 7 as schematically shown in FIG. 5 were produced in the same manner as when the secondary correction function described above was created. The exposure data of the product pattern 7 (here, not the corrected exposure data but the initial exposure data means the same as the original data) is corrected using only the primary correction function created above. Then, exposure data for which the correction processing is not applied to the exposure data of the test pattern 1 is created and exposed. The rest is the same as in the first embodiment.

(Comparative Example 2)
Three real pattern substrates C4c mixed with the test pattern 1 and the product pattern 7 as schematically shown in FIG. 5 were produced in the same manner as when the secondary correction function described above was created. The exposure data of the product pattern 7 (here, not the corrected exposure data but the initial exposure data means the same as the original data) is corrected using only the secondary correction function created above. Then, exposure data for which the correction processing is not applied to the exposure data of the test pattern 1 was created and exposed. The rest is the same as in the first embodiment.

<Evaluation of process capability>
With respect to the actual pattern substrates for evaluation produced in Example 1 and Comparative Examples 1 and 2, the part of the product pattern 7 where the design value of the pattern width / pattern gap is 30 μm / 30 μm (121 points / sheet × 3 sheets) ), The pattern width was measured at a magnification of 200 times using a measuring microscope, and the process capability was investigated from the difference from the original data (design value). The results are shown in Table 1. ± 10 μm and ± 12 μm described in the right column of the process capability indicate the allowable range of variation with respect to the design value (30 μm / 30 μm) of the pattern width / pattern gap, and Cp and Cpk indicate the process capability index.

As shown in Table 1, in this embodiment, the combination ratio (ratio) of the correction amount of the primary correction function in the correction amount by the primary correction function and the correction amount by the secondary correction function is 0.5, 0,. In Examples where the tertiary correction function was created as 7 and 0.3, sufficient process capability was obtained, and the best results were obtained when the composite ratio of the primary correction function was 0.5. On the other hand, in Comparative Examples 1 and 2, the process capability tends to be lower than in the Examples.

(Example 2)
Similar to Example 1, <Creation of primary correction function>, <Correction of exposure data using primary correction function>, <Creation of secondary correction function>, <Creation of tertiary correction function>, <Cubic correction function Correction of exposure data using was performed.

<Create other secondary correction functions>
Next, in order to create another secondary correction function, an actual pattern in which the test pattern 1 and the product pattern 7 as schematically shown in FIG. One substrate C4c was produced. Note that the exposure data of the product pattern 7 (here, not the corrected exposure data but the initial exposure data means the same as the original data) is subjected to a correction process using the tertiary correction function created above. The exposure data for test pattern 1 was subjected to exposure by creating exposure data that was not subjected to correction processing.

Next, the actual pattern data (finished value) is obtained for the actual pattern substrate C4c by using an optical automatic visual inspection apparatus, and the result is shown in FIG. A quadratic correction function was created. Further, the pattern gap 2 at the other stages is on the straight line connecting the actual pattern data of the pattern gap 2 at the stage of obtaining the actual pattern data in the same manner as the above-described secondary correction function is created. Obtained by calculation assuming that there is. That is, although not shown in the table of FIG. 15, the actual pattern data was actually acquired only for the six stages, and based on this, the actual pattern data for all 24 stages were estimated. As a result, the actual pattern data to be acquired is reduced and the data processing load is reduced.

<Create other cubic correction functions>
Next, in the same manner as when the above-described tertiary correction function is created, as shown in FIG. 16, the combination ratio (ratio) of the correction amount by the primary correction function and the correction amount by another secondary correction function is set to 0. 5, other cubic correction functions were created. Specifically, the one-side correction amount for each pattern gap was synthesized by the following equation (3).
One-side correction amount of other tertiary correction function (μm) = (One-side correction amount of primary correction function (μm)
+ One-sided correction amount of other secondary correction function (μm)) / 2 (3)
In other words, in this embodiment, the primary correction function is fixed, and another secondary correction function newly created every time a real pattern substrate is produced is synthesized with this same primary correction function, Create a cubic correction function. For this reason, it is suitable for the case where the state of the production process hardly fluctuates due to an increase in the number of production and the like and is relatively stable. Here, the data of the one-side correction amount when the other secondary correction function is created is acquired only for the pattern gaps in six stages, which is smaller than the 24 stages when the primary correction function is created. In addition, it was estimated by calculation so as to be the data for the same 24 stages as when the primary correction function was created.

<Exposure data correction using other cubic correction functions>
The correction process to the exposure data of the product pattern 7 using another tertiary correction function is, for example, the composition ratio of the correction amount by the primary correction function to the entire correction amount by the primary correction function and the correction amount by the other secondary correction function. When the (ratio) is 0.5, in the exposure data of the product pattern 7, the pattern gap finish value in the table of FIG. 16 is 28.6 μm (one-side correction amount is 4) for the design value of 30 μm. .3 μm) and the finished value is 32.9 μm (one-side correction amount is 5.4 μm), the one-side correction amount value when the finished value is 30 μm is on a straight line connecting these data. Obtained by calculation assuming that there is. When the finished value of the pattern gap thus obtained by calculation is 30 μm, the one-side correction amount is 4.7 μm, and exposure data (in this case, it means initial exposure data, not corrected exposure data, (Same as the data.) Correction processing for narrowing the pattern gap by 4.7 μm on each side was performed. In other words, the exposure data after the pattern gap correction processing is set to 20.6 μm at the portion where the design data (design value) of the pattern gap of the product pattern 7 is 30 μm.

At this time, the exposure data of the product pattern 7 (here, the initial exposure data means the same as the original data) is subjected to a correction process using the other third-order correction function created above, and the test pattern 1 The exposure data was not corrected. For test pattern 1, an actual pattern is always created using the same exposure data as when the primary correction function was created, and the actual pattern data for creating the secondary correction function thereafter is collected.

(Example 3)
Similar to Example 2, <Creation of primary correction function>, <Correction of exposure data using primary correction function>, <Creation of secondary correction function>, <Creation of tertiary correction function>, <Cubic correction function Correction of exposure data using, and <Create other secondary correction functions>.

<Create other cubic correction functions>
Next, the combined ratio (ratio) of the correction amount based on the tertiary correction function in the correction amount based on the tertiary correction function created above and the correction amount based on the other secondary correction function is set to 0.5, 0.7,. 3, another cubic correction function was created. FIG. 17 shows a case where the composition ratio (ratio) of correction amounts by the cubic correction function is 0.5. Specifically, when the combination ratio (ratio) of the correction amounts by the tertiary correction function is 0.5, the combination ratio (ratio) of the correction amounts by the other secondary correction functions is 0.5. The one-side correction amount for each gap was synthesized by the following equation (4).
One-side correction amount (μm) of other tertiary correction function = one-side correction amount (μm) of tertiary correction function × 0.5
+ Other-side correction function one-side correction amount (μm) × 0.5 (4)
That is, in this embodiment, by synthesizing a secondary correction function that is newly created every time an actual pattern substrate is produced, with respect to a tertiary correction function obtained by synthesizing the primary correction function and the secondary correction function, Create another cubic correction function. For this reason, since the tertiary correction function used for correcting the original data or the exposure data is the cumulative result of the secondary correction function, the status of the manufacturing process varies in a specific direction due to the accumulation of the production number or the like. It is suitable when there is a tendency. Here, the data of the one-side correction amount when another secondary correction function is created is acquired only for the pattern gaps in six stages, which is smaller than the 24 stages when the tertiary correction function is created. In addition, it was estimated by calculation so as to obtain data for the same 24 stages as when the cubic correction function was created.

<Exposure data correction using other cubic correction functions>
The correction process to the exposure data of the product pattern 7 using another tertiary correction function is, for example, a combination ratio of the correction amount by the tertiary correction function to the total correction amount by the tertiary correction function and the correction amount by the other secondary correction function. When the (ratio) is 0.5, in the exposure data of the product pattern 7, the finished value of the pattern gap in the table of FIG. 17 is 27.8 μm (one-side correction amount is 3) for the design value 30 μm. .9 μm) and the finished value is 31.8 μm (one-side correction amount is 4.9 μm), the one-side correction amount value when the finished value is 30 μm is on a straight line connecting these data. Obtained by calculation assuming that there is. When the finished value of the pattern gap thus obtained by calculation is 30 μm, the one-side correction amount is 4.5 μm, and exposure data (here, not the exposure data after correction but the initial exposure data, (Same as data)) was corrected to narrow the pattern gap by 4.5 μm on each side. In other words, the exposure data after the pattern gap correction processing is set to 21.0 μm at the portion where the design data (design value) of the pattern gap of the product pattern 7 is 30 μm.

1: Test pattern 2: Pattern gap 3: Pattern 4: Real pattern substrate 4a: Real pattern substrate A (test substrate)
4b: Actual pattern substrate B (test substrate)
4c: Actual pattern substrate C (product substrate)
5: Substrate 6: Product pattern area 7: Product pattern 8: Data correction device 9: Bus 10: Wiring pattern forming system

Claims

A step (A) of creating exposure data based on the original data of the target wiring pattern;
A step (B) of creating actual pattern data from the actual pattern substrate formed using the exposure data;
And (C) creating correction data of the original data or exposure data based on the difference between the original data and the actual pattern data,
The step (C) of creating the correction data includes
Creating difference data from the difference between the actual pattern data and the original data or exposure data (C-1);
From the relationship between the difference data and the factor causing the difference, a plurality of corrections defining the relationship between the factor causing the difference and the correction amount of the original data or the correction amount of the exposure data for suppressing the difference Creating a function (C-2);
A step (C-3) of creating a correction function by combining the plurality of correction functions;
(C-4) correcting the original data or exposure data of the wiring pattern using the combined correction function;
A method of manufacturing a wiring board having
In the step (C-2) of creating the plurality of correction functions, a primary correction function created using an actual pattern substrate and a secondary correction function created using another actual pattern substrate are created,
In the step of creating the combined correction function (C-3), a tertiary correction function is generated by combining the primary correction function and the secondary correction function,
The wiring board according to claim 1, wherein in the step (C-4) of correcting the original data or exposure data, the original data or exposure data of the wiring pattern of the real pattern board is corrected using the cubic correction function. Manufacturing method.
In the step (C-2) of creating the plurality of correction functions, in addition to the secondary correction function, another secondary correction function created using another actual pattern substrate is created,
3. The step (C-3) of creating the combined correction function creates another tertiary correction function by combining the tertiary correction function and the other secondary correction function that has been generated. Wiring board manufacturing method.
In the step (C-2) of creating the plurality of correction functions, the actual pattern substrate used to create the primary correction function and another actual pattern substrate used to create another secondary correction function or The method for manufacturing a wiring board according to claim 2, wherein the other actual pattern board has the same wiring pattern.
In the step (C-2) of creating the plurality of correction functions, another secondary correction function created after the secondary correction function is created for each actual pattern substrate production lot or each actual pattern substrate. The method for manufacturing a wiring board according to any one of claims 2 to 4.
The factor causing the difference between the actual pattern data and the original data or exposure data is any of the pattern gap, pattern size, pattern thickness, pattern position of the original data or exposure data of the wiring pattern of the actual pattern substrate, or The method for manufacturing a wiring board according to any one of claims 1 to 5, which is a combination of any two or more.
As a factor causing a difference between the actual pattern data and the original data or exposure data, any one of the pattern gap, pattern size, pattern thickness, pattern position of the original data or exposure data of the wiring pattern of the actual pattern substrate or The method for manufacturing a wiring board according to claim 6, wherein actual pattern data corresponding to any combination of two or more is used.
A data correction apparatus for wiring pattern original data or exposure data used in the method for manufacturing a wiring board according to claim 1,
Difference data is created from the difference between the original data of the target wiring pattern or the exposure data created based on the original data and the actual pattern data created from the actual pattern substrate formed using the exposure data (C -1),
From the relationship between the difference data and the factor causing the difference, a plurality of factors defining the relationship between the factor causing the difference and the correction amount of the original data or the correction amount of the exposure data for suppressing the difference Create a correction function (C-2)
Create a correction function that combines these correction functions (C-3),
A data correction device that generates correction data of the original data or exposure data of the wiring pattern corrected using a correction function generated by combining the plurality of correction functions (C-4).
When creating a plurality of correction functions (C-2), a primary correction function created using an actual pattern substrate and a secondary correction function created using another actual pattern substrate are created,
When generating the combined correction function (C-3), a tertiary correction function is generated by combining the primary correction function and the secondary correction function,
9. The data correction according to claim 8, wherein the original data or exposure data is corrected (C-4) by using the cubic correction function to correct the original data or exposure data of the wiring pattern of the actual pattern substrate. apparatus.
In creating the plurality of correction functions (C-2), in addition to the secondary correction function, another secondary correction function created using another actual pattern substrate is created,
10. When generating the combined correction function (C-3), the tertiary correction function and the further generated secondary correction function are combined to generate another tertiary correction function. The data correction apparatus described.
When creating the plurality of correction functions (C-2), the actual pattern substrate used to create the primary correction function and other actual pattern substrates used to create other secondary correction functions The data correction device according to claim 9 or 10, wherein the other wiring substrate has the same wiring pattern.
When creating the plurality of correction functions (C-2), another secondary correction function created after the secondary correction function is created for each production lot or real pattern substrate of the actual pattern substrate. The data correction neglect according to any one of claims 9 to 11.
The factor causing the difference between the actual pattern data and the original data or exposure data is any of the pattern gap, pattern size, pattern thickness, pattern position of the original data or exposure data of the wiring pattern of the actual pattern substrate, or The method for manufacturing a wiring board according to any one of claims 8 to 12, which is a combination of any two or more.
As a factor causing a difference between the actual pattern data and the original data or exposure data, any one of the pattern gap, pattern size, pattern thickness, pattern position of the original data or exposure data of the wiring pattern of the actual pattern substrate or The method for manufacturing a wiring board according to claim 13, wherein actual pattern data corresponding to any combination of two or more is used.
The data correction device according to any one of claims 8 to 14,
A pattern exposure apparatus that exposes an exposure pattern to a photosensitive resist arranged on a substrate based on exposure data created from original data corrected by the data correction apparatus or exposure data corrected by the data correction apparatus When,
A development pattern forming apparatus for developing a photosensitive resist exposed with the exposure pattern to form a development pattern;
An actual pattern forming apparatus that forms a real pattern by performing circuit processing on the substrate on which the development pattern is formed;
A wiring pattern forming system comprising: an actual pattern data creating device that creates actual pattern data from the actual pattern.
A data correction method for original data of a wiring pattern or exposure data using the data correction device according to any one of claims 8 to 14,
A step of creating difference data from the difference between the original data of the target wiring pattern or the exposure data created based on the original data and the actual pattern data created from the actual pattern substrate formed using the exposure data ( C-1)
From the relationship between the difference data and the factor causing the difference, a plurality of factors defining the relationship between the factor causing the difference and the correction amount of the original data or the correction amount of the exposure data for suppressing the difference Creating a correction function (C-2);
A step (C-3) of creating a correction function by combining the plurality of correction functions;
A step (C-4) of creating correction data of the original data or exposure data of the wiring pattern corrected using a correction function created by combining the plurality of correction functions;
A data correction method comprising: