WO2015025787A1 - 感光性ガラス基板の製造方法 - Google Patents
感光性ガラス基板の製造方法 Download PDFInfo
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- WO2015025787A1 WO2015025787A1 PCT/JP2014/071390 JP2014071390W WO2015025787A1 WO 2015025787 A1 WO2015025787 A1 WO 2015025787A1 JP 2014071390 W JP2014071390 W JP 2014071390W WO 2015025787 A1 WO2015025787 A1 WO 2015025787A1
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- photosensitive glass
- glass substrate
- heat treatment
- dimensional change
- hole
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C4/00—Compositions for glass with special properties
- C03C4/04—Compositions for glass with special properties for photosensitive glass
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C15/00—Surface treatment of glass, not in the form of fibres or filaments, by etching
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C23/00—Other surface treatment of glass not in the form of fibres or filaments
- C03C23/0005—Other surface treatment of glass not in the form of fibres or filaments by irradiation
- C03C23/0025—Other surface treatment of glass not in the form of fibres or filaments by irradiation by a laser beam
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/095—Glass compositions containing silica with 40% to 90% silica, by weight containing rare earths
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2051—Exposure without an original mask, e.g. using a programmed deflection of a point source, by scanning, by drawing with a light beam, using an addressed light or corpuscular source
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/36—Imagewise removal not covered by groups G03F7/30 - G03F7/34, e.g. using gas streams, using plasma
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/38—Treatment before imagewise removal, e.g. prebaking
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B32/00—Thermal after-treatment of glass products not provided for in groups C03B19/00, C03B25/00 - C03B31/00 or C03B37/00, e.g. crystallisation, eliminating gas inclusions or other impurities; Hot-pressing vitrified, non-porous, shaped glass products
Definitions
- the present invention relates to a method for producing a photosensitive glass substrate.
- Photosensitive glass is glass in which only an exposed portion is crystallized by exposing and heat-treating glass containing a photosensitive component and a sensitizing component.
- the crystallized portion has a significantly different dissolution rate with respect to the acid than the non-crystallized portion. Therefore, by utilizing this property, selective etching can be performed on the photosensitive glass. As a result, fine processing can be performed on the photosensitive glass without using machining. Further, by heat-treating the photosensitive glass at a temperature higher than that at the time of exposure, crystallized photosensitive glass in which fine crystals are precipitated in the photosensitive glass can be obtained. This crystallized photosensitive glass is excellent in mechanical properties and chemical durability.
- the exposure of the photosensitive glass is performed using a photomask as in the semiconductor element manufacturing process. Specifically, ultraviolet light as exposure light enters the photomask, and the ultraviolet light is exposed only from the opening where the light-shielding film is not formed, that is, from the portion provided to correspond to the portion to be finely processed. Invade inside.
- the energy of the ultraviolet rays releases electrons from the sensitizing component (CeO 2 or the like), and the ions of the photosensitive component (Au, Ag, Cu, etc.) capture the electrons to cause a redox reaction.
- the metal of the photosensitive component is generated inside the photosensitive glass, and a latent image is formed (see, for example, Patent Document 1).
- the photosensitive glass is indirectly irradiated with ultraviolet rays through the photomask to form a latent image.
- Photosensitive glass (including crystallized photosensitive glass) has good mechanical properties as glass and can be finely processed at low cost. For this reason, it has begun to be applied to an interposer in which an expensive Si wafer has been used conventionally, a gas electronic amplifier substrate in which a resin such as polyimide having low mechanical properties has been used.
- the dimensions of photosensitive glass change due to heat treatment at high temperatures. Especially, when crystallized photosensitive glass in which fine crystals are precipitated in the photosensitive glass after fine processing such as formation of through-holes is performed, the photosensitive glass is crystallized. The dimensional change amount becomes relatively large. Specifically, the crystallized photosensitive glass shrinks by about 1.1% as compared to the photosensitive glass before microfabrication.
- the photosensitive glass When forming a through-hole having a size of, for example, about several tens of ⁇ m in such a photosensitive glass using a photomask, the photosensitive glass is subjected to heat treatment after the pattern is formed by the photomask. Therefore, if patterning with a photomask is not performed in consideration of the dimensional change amount, the dimensional change amount due to the subsequent heat treatment is extremely larger than the diameter of the through hole. It will deviate greatly from. In particular, as the substrate size increases, the dimensional change amount of the substrate also increases, and this problem becomes significant.
- step-and-repeat In the case of using a photomask, in order to improve patterning accuracy, a predetermined correction is performed on the photomask by a method called step-and-repeat.
- step-and-repeat the entire pattern to be formed is not formed all at once, but the formation of a part of the pattern is repeated by using a photomask of a repeating unit that is a part of the formed pattern. Form. Therefore, the accuracy of the entire pattern can be improved only by performing a predetermined correction on the photomask.
- the amount of dimensional change differs between the central portion and the outer peripheral portion of the photosensitive glass substrate. Therefore, when correcting the formation position of the through-hole in step and repeat, since the correction amount differs depending on the repeat position, many photomasks having different correction amounts are required, which is not practical.
- the present invention is made in view of the above situation, and by directly correcting the irradiation position of the energy beam in consideration of the dimensional change amount of the photosensitive glass caused by the heat treatment, the fine processing such as the formation position of the through hole is performed.
- An object is to provide a method capable of easily improving accuracy.
- the present inventor found that the amount of dimensional change of the photosensitive glass due to heat treatment is large and varies depending on the location of the photosensitive glass, but the variation of the dimensional change amount for each photosensitive glass is small. It was found that the amount does not affect the position error. As a result, it was found that the setting of the correction amount can be simplified.
- the aspect of the present invention is An irradiation process in which a latent image is formed by directly irradiating an energy beam to a plate-shaped substrate made of photosensitive glass; A crystallization step of crystallizing the latent image by a first heat treatment to obtain a crystallized portion; A fine processing step of dissolving and removing the crystallized portion to perform fine processing to obtain a photosensitive glass substrate; Have In the irradiation step, the photosensitive glass substrate manufacturing method corrects the irradiation position of the energy beam based on at least a dimensional change amount of the photosensitive glass caused by the heat treatment including the first heat treatment.
- the heat treatment preferably includes a second heat treatment performed on the photosensitive glass substrate after the fine processing step.
- the correction amount calculated based on the dimensional change amount at a predetermined point on the photosensitive glass substrate is a distance between the center point of the photosensitive glass substrate and the predetermined point before the heat treatment. Is preferably within the range of 0 to 0.3%. Alternatively, the correction amount is preferably in the range of 0 to ⁇ 2% with respect to the distance between the center point of the photosensitive glass substrate and a predetermined point before the heat treatment.
- the center point of the photosensitive glass substrate is the center of gravity of the photosensitive glass substrate.
- the microfabrication step is a through-hole forming step in which the crystallized portion is dissolved and removed to form a through-hole, the photosensitive glass substrate has a diameter of 100 mm or more, and the through-hole has a diameter of 100 ⁇ m or less. It is preferable that
- the precision of fine processing such as the formation position of a through hole is easily improved by directly correcting the irradiation position of the energy beam in consideration of the dimensional change of the photosensitive glass caused by the heat treatment.
- a method that can be provided can be provided.
- FIG. 1 is a schematic view showing a manufacturing process of a photosensitive glass substrate in the manufacturing method according to the present embodiment.
- FIG. 2 is a schematic diagram showing an example of a method for measuring a dimensional change amount of a photosensitive glass substrate by heat treatment in the manufacturing method according to the present embodiment.
- FIG. 3 is an enlarged view of a portion III in FIG. 2, and includes a reference mark formed on the photosensitive glass substrate before the heat treatment and a reference mark formed on the photosensitive glass substrate after the heat treatment. It is a schematic diagram shown.
- FIG. 4 is a schematic graph showing the relationship between the distance from the origin in the X direction and the dimensional change amount of the photosensitive glass substrate shown in FIG.
- the photosensitive glass substrate is not particularly limited as long as it is made of photosensitive glass.
- the photosensitive glass substrate has a plate shape, and may be a circular plate shape or a rectangular plate shape such as a rectangle or a square depending on the application.
- the diameter of the photosensitive glass substrate is not particularly limited, but the effect of the present invention becomes more remarkable when the diameter of the photosensitive glass substrate is 100 mm or more.
- the diameter of the photosensitive glass substrate indicates the diameter when the photosensitive glass substrate is a circular plate, and the side length when the photosensitive glass substrate is a rectangular plate. Show.
- the thickness of the photosensitive glass substrate may be determined according to the application, but is about 0.1 to 1 mm, for example.
- the photosensitive glass substrate is formed with a plurality of through holes regularly arranged on the main surface of the substrate.
- the shape of the through hole is not particularly limited, but is usually circular in plan view.
- the diameter of the through holes is about 10 to 100 ⁇ m, and the arrangement pitch of the through holes is about 20 to 300 ⁇ m.
- the photosensitive glass substrate is a substrate on which a very large number (thousands to millions) of fine through holes are formed. A method of forming the through hole will be described later.
- the photosensitive glass contains Au, Ag, and Cu as photosensitive components in SiO 2 —Li 2 O—Al 2 O 3 glass, and further contains CeO 2 as a sensitizing component. It is glass.
- SiO 2 55 to 85% by mass
- Al 2 O 3 2 to 20% by mass
- SiO 2 , Al 2 O 3 and Li 2 O Is 85% by mass or more with respect to the entire photosensitive glass
- Au 0.001 to 0.05% by mass
- Ag 0.001 to 0.5% by mass
- Examples include a composition containing ⁇ 1% by mass as a photosensitive component and further containing CeO 2 : 0.001 ⁇ 0.2% by mass as a sensitizing component. What is necessary is just to determine the content of a photosensitive component and a sensitizing component according to the sensitivity with respect to the energy beam used at the irradiation process mentioned later.
- photosensitive glass examples include PEG3 manufactured by HOYA Corporation and PEG3C manufactured by HOYA Corporation obtained by crystallization of PEG3.
- a latent image is formed on a base material composed of photosensitive glass, and the latent image is crystallized and then dissolved and removed to form a through hole. Manufactured. A specific method will be described with reference to FIG.
- a substrate 11 made of photosensitive glass is prepared.
- the photosensitive glass the glass described above may be used.
- a latent image 17 is formed on a portion of the base material 11 that is to become a through hole (hereinafter also referred to as a through hole formation scheduled portion 16).
- the latent image 17 is formed by directly irradiating the substrate 11 with the energy beam 50 from the irradiation source 51 without using a photomask. That is, as shown in FIG. 1B, when the energy beam 50 is irradiated, the energy beam 50 is sequentially applied to the through-hole formation scheduled portion 16 while controlling the energy beam irradiation source 51 by a known moving mechanism (not shown).
- the latent image 17 is formed by irradiation.
- the energy beam 50 may be irradiated while position control (for example, XY direction control) of the stage (not shown) on which the substrate 11 is placed.
- the irradiation position of the energy beam 50 is corrected based on the dimensional change amount of the photosensitive glass caused by the heat treatment described later. A specific correction method will be described later.
- the energy beam 50 is not particularly limited, but the following energy beam 50 is preferable. That is, any beam having an energy sufficient to cause a redox reaction between the photosensitive component and the sensitizing component in the photosensitive glass and to sufficiently generate the metal of the photosensitive component may be used. Further, any beam that can narrow the beam diameter to such an extent that the latent image 17 corresponding to the diameter of the through-hole to be formed can be formed may be used.
- laser light is used as the energy beam. This is because the laser light has high directivity and a high energy density can be realized by further reducing the beam diameter.
- Specific examples of laser light include UV laser light and excimer laser light.
- a first heat treatment is performed on the substrate on which the latent image is formed.
- the first heat treatment is a process performed to make the latent image a crystallized portion.
- the irradiation process in the latent image formed by irradiating the laser beam, there is a metal of the photosensitive component generated by the oxidation-reduction reaction between the photosensitive component (Au or the like) and the sensitizing component (Ce or the like). ing.
- a silicate crystal is precipitated, and a crystallized portion 18 is formed. Accordingly, the crystallized portion 18 is formed at a position corresponding to the through-hole forming scheduled portion 16 as in the latent image 17.
- the holding time is not particularly limited, and may be a time that allows lithium monosilicate crystals to sufficiently precipitate and the size of the crystals not to become too large. This is because if the crystal size becomes too large, the precision of microfabrication by etching, which will be described later, deteriorates.
- the photosensitive glass softens at around 515 ° C.
- the formed crystallized portion 18 is dissolved and removed by etching using HF (hydrogen fluoride) to form the through hole 15.
- HF hydrogen fluoride
- the crystallized portion 18, that is, lithium monosilicate, is more easily dissolved in hydrogen fluoride than the non-crystallized glass portion.
- the difference in dissolution rate between the crystallized portion 18 and the glass portion other than the crystallized portion is about 50 times. Therefore, using this difference in dissolution rate, hydrogen fluoride is used as an etchant, and for example, by spraying hydrogen fluoride onto both surfaces of the substrate 11 by spray etching (not shown), the crystallized portion 18 is dissolved.
- the through-holes 15 are formed by removing them. That is, the through hole 15 can be formed by selectively etching the base material 11.
- the photosensitive glass substrate 10 in which the through holes 15 are formed is subjected to the second heat treatment to modify the photosensitive glass.
- the second heat treatment is performed at a temperature higher than that of the first heat treatment, for example, in the range of 800 to 1200 ° C.
- FIG. 1 (e) lithium disilicate crystals are precipitated on the entire photosensitive glass, and the photosensitive glass is modified to form a crystallized photosensitive glass substrate 10a.
- Crystallized photosensitive glass is superior in mechanical properties, chemical durability, and the like to a photosensitive glass that has not been modified.
- the crystallized photosensitive glass is also simply referred to as photosensitive glass.
- the obtained photosensitive glass substrate is used for the above-described applications. At this time, the conductive metal is filled in the through holes as necessary.
- the photosensitive glass substrate is often exposed through a photomask having a mask pattern corresponding to a pattern to be exposed (for example, a through-hole formation scheduled portion).
- a photomask having a mask pattern corresponding to a pattern to be exposed (for example, a through-hole formation scheduled portion).
- the accuracy of patterning for example, the displacement of the formation position of the through hole
- a new problem becomes apparent. This problem is caused by the properties unique to the photosensitive glass.
- the above-mentioned properties unique to the photosensitive glass are dimensional changes caused by the heat treatment of the photosensitive glass substrate.
- the heat treatment as described above causes a change in volume in the photosensitive glass substrate due to new crystal precipitation, structural change from an amorphous state to a crystalline state, etc. Dimensional change of the photosensitive glass substrate occurs.
- the first heat treatment and the second heat treatment described above cause a maximum shrinkage of about 1.1% with respect to the substrate size before the heat treatment. Therefore, for example, when the size of one side in the plane direction of the substrate, that is, the diameter of the substrate is about 300 mm, after the first heat treatment and the second heat treatment, the outer peripheral portion of the substrate contracts by about 3.3 mm in the plane direction.
- shrinkage amount of dimensional change
- the diameter of the through holes formed in the photosensitive glass substrate is about several tens ⁇ m and the arrangement pitch is about several tens to several hundreds ⁇ m.
- the through holes need to be formed correctly at predetermined positions. Therefore, it is required that the accuracy of the formation position of the through-hole is high despite the above-described dimensional change amount being extremely large with respect to the diameter of the through-hole.
- the error range (accuracy) of the through hole formation position is about 10 to 25 ⁇ m, although it depends on the diameter of the through hole.
- Such displacement of the formation position is such that the size of the photosensitive glass substrate is large (that is, the dimensional change is large), and the diameter or arrangement of the through holes 15 is made fine (that is, the positional accuracy of the arrangement becomes severe). It can be easily understood that it becomes prominent.
- the through-holes on the photosensitive glass substrate before the heat treatment so that the displacement (error) of the formation position of the through-hole is within the above range while taking into account the dimensional change amount of the photosensitive glass substrate after the heat treatment. It is necessary to correct the position of the portion to be formed.
- the mask pattern of the photomask needs to be a mask pattern reflecting the dimensional change of the photosensitive glass substrate. In this case, it is conceivable to perform pattern exposure while performing correction in step-and-repeat.
- step-and-repeat correction pattern formation is repeated by using a photomask having a mask pattern in which a predetermined correction is reflected on a part of the pattern (repeating unit) formed on the substrate. This is done by forming a pattern. That is, the exposure position is indirectly corrected by making a fine adjustment to the mask pattern of the photomask.
- the dimension of the object to be patterned that is, the photosensitive glass substrate itself is changed, and the dimensional change amount is different between the outer peripheral portion and the central portion.
- the dimensional change amount in step-and-repeat, when the repeat position changes, the dimensional change amount also changes. Therefore, in order to correct the formation position of the through hole, it is necessary to produce a large number of photomasks corresponding to the magnitude of the dimensional change, which is not practical from the viewpoint of cost and the like.
- the present inventor found a very important fact regarding the dimensional change of the photosensitive glass substrate.
- the fact is that the dimensional change of the photosensitive glass due to the heat treatment itself is so large that it affects the accuracy of the formation position of the fine through-hole, but the photosensitive glass substrate having the same composition is heat-treated under the same conditions.
- the difference in the dimensional change amount generated for each photosensitive glass substrate is small, that is, the variation in the dimensional change amount is small. In other words, the same dimensional change occurs in any substrate by the heat treatment.
- the variation in the amount of dimensional change that appears when a substrate having a diameter of 300 mm and a substrate having the same composition is subjected to heat treatment under the same conditions is, for example, after the first heat treatment and the second heat treatment are performed.
- Has been found for the first time to be about ⁇ 10 ⁇ m, which is extremely small compared to the dimensional change amount itself.
- the error range (patterning accuracy) required for the through hole formation position is about 10 to 25 ⁇ m
- the variation is required for the through hole formation position. It is considered that the position accuracy is not so affected. Therefore, it is not always necessary to set a correction amount based on the dimensional change amount for each substrate, and the correction amount set for one substrate can be applied to another substrate. That is, the setting of the correction amount can be simplified.
- the correction of the irradiation position in the irradiation step is performed according to the dimensional change amount of the photosensitive glass caused by the first heat treatment in the crystallization step and the second heat treatment in the photosensitive glass modification step. Done.
- an operation for forming a latent image on the photosensitive glass substrate is performed. This is performed by directly irradiating an energy beam such as a laser beam at a position corrected in advance by reflecting the amount of dimensional change.
- an energy beam such as a laser beam
- the corrected position a position different from the original formation position
- the corrected position is corrected in consideration in advance, there is no deviation in fine patterning (for example, the formation position of the through hole) after the heat treatment.
- the correction amount is calculated from the relationship between the distance from the origin and the dimensional change amount with the center of the substrate as the origin. Then, the calculated correction amount is added to the initial value of the coordinates of the through-hole formation scheduled portion set without considering the dimensional change, thereby correcting the irradiation position of the energy beam. This will be specifically described below.
- the photosensitive glass substrate for measuring the dimensional change is subjected to heat treatment, the dimensional change of the substrate is measured, and the correction amount is set based on the obtained dimensional change.
- the heat treatment may be only the first heat treatment or both the first heat treatment and the second heat treatment.
- the set correction amount is added to the coordinates (position) of the through-hole formation scheduled portion in the photosensitive glass substrate on which the through-hole is formed.
- the accuracy of the through-hole formation position can be further increased.
- the correction amount can be set more appropriately, and the through hole formation position accuracy can be further increased.
- detectable reference marks 31 to 38 are attached on a photosensitive glass substrate 10b for measuring a dimensional change before heat treatment.
- the reference marks 31 to 38 are attached to detect the dimensional change amount of the photosensitive glass substrate 10b.
- two virtual reference lines 40 and 41 passing through the center point O of the photosensitive glass substrate 10b are set, the virtual reference line 40 is set as the X direction, and the virtual reference line 41 is set as the Y direction.
- Reference marks 31 to 34 are arranged in the X direction, and reference marks 35 to 38 are arranged in the Y direction. These reference marks 31 to 38 are arranged such that the distance from the center point O is a predetermined distance (X1, X2,..., Y1, Y2,).
- the center point O of the photosensitive glass substrate 10b is the center of gravity of the photosensitive glass substrate 10b. That is, as shown in FIG. 2, when the shape of the photosensitive glass substrate 10b is a square, the center point O of the photosensitive glass substrate 10b is an intersection of diagonal lines. When the shape of the photosensitive glass substrate is circular, the center point O of the photosensitive glass substrate 10b is the center of the circle.
- the reference marks 31 to 38 are not particularly limited as long as the reference marks 31 to 38 are arranged so as to detect the dimensional change amount.
- alignment marks used for other purposes may be used.
- the photosensitive glass substrate 10b (photosensitive glass substrate for measuring dimensional change) on which the reference marks 31 to 38 are formed is subjected to heat treatment, and then the positions of the reference marks 31 to 38 are detected to change the dimensions. Calculate the amount.
- the method for detecting the reference marks 31 to 38 is not particularly limited as long as it can reliably detect the formed marks, and a known detection method may be used as appropriate.
- the coordinates of each reference mark may be calculated using a known image processing technique.
- the distance between the center point O and the reference mark 31a is X1 ′
- the distance between the center point O and the reference mark 32a is X2 ′
- the distance X3 ′ between the center point O and the reference mark 33a is the center point O and This is the distance X4 ′ from the reference mark 34a.
- the obtained distances X1 ′, X2 ′, X3 ′, X4 ′ and the distances between the center point O on the photosensitive glass substrate 10b before the heat treatment and the respective reference marks, that is, X1, X2, X3, X4. are respectively compared with each other to calculate the amount of dimensional change in the X direction at each reference mark on the photosensitive glass substrate.
- a function 70 indicating the relationship between the distance from the origin (X1 to X4) and the dimensional change amount (a1 to a4) is calculated.
- a function calculation method a known method may be used, and for example, a least square method or the like may be used.
- a function indicating the relationship between the distance from the origin and the dimensional change amount is calculated.
- the correction amount is calculated by substituting the coordinates (position) of each through-hole formation scheduled portion into the obtained function. Then, the calculated correction amount is added to the coordinates of the through-hole formation scheduled portion that does not consider the dimensional change amount.
- the coordinates of the center point of the through hole at the planned formation position in the photosensitive glass substrate before the heat treatment are (X1, Y1)
- the calculated correction amount in the X direction is a1
- the correction amount in the Y direction is b1.
- the coordinates of the center point of the corrected through hole are (X1 + a1, Y1 + b1)
- the energy beam is irradiated with the coordinates as the center position.
- the diameter of the through hole is controlled so that a latent image having a diameter reflecting the dimensional change amount is formed.
- the irradiation position of the energy beam in the irradiation process is corrected to become coordinates (X1 + a, Y1 + b), and the beam diameter at the time of irradiation reflects the correction amount based on the dimensional change amount with respect to the diameter of the through-hole to be formed. It is set so that it may become a diameter.
- the energy beam is directly irradiated to the corrected irradiation position.
- the dimensional change amount is canceled to the correction amount. Therefore, the through hole in the final photosensitive glass substrate obtained after the heat treatment is formed at a predetermined planned formation position, that is, at coordinates (X1, Y1), and effectively suppresses the deviation of the formation position of the through hole. be able to.
- the correction amount at the predetermined through-hole formation scheduled position on the photosensitive glass substrate is based on the distance between the center point of the photosensitive glass substrate and the predetermined through-hole formation planned position before the heat treatment. Is in the range of 0 to -2%.
- correction amount setting method is not limited to the above method, and the correction amount may be determined using another method.
- the amount of dimensional change of the photosensitive glass substrate due to the heat treatment is large, and processing accuracy has been a problem when fine processing (for example, formation of fine through holes) is performed on the substrate. Specifically, when a through hole is formed in a substrate, a shift is likely to occur between the actual formation position of the through hole and a predetermined planned formation position.
- the correction amount based on the dimensional change amount of the photosensitive glass substrate is reflected in the irradiation position of the energy beam without using a mask.
- difference of the formation position of a through-hole can be suppressed effectively. Therefore, with the method according to the present embodiment, even when fine patterning is performed, the patterning can be performed with high accuracy.
- the energy beam irradiation position itself is directly corrected, not the correction by the mask pattern. Therefore, as long as the correction amount can be determined, correction reflecting the correction amount can be easily performed. Also, the correction amount can be easily and accurately set because there is little variation in the dimensional variation of the photosensitive glass substrate, and it is not necessary to set it for each substrate.
- the present embodiment it is possible to easily realize such high precision of fine patterning (suppression of displacement of the formation position).
- the correction amount can be calculated easily and accurately, and the energy beam is directly applied to the photosensitive glass substrate. This is because it can be reflected in the position.
- the first heat treatment that is, the heat treatment in the crystallization process
- the first heat treatment expands by about 0.1% with respect to the substrate size before the heat treatment. That is, when the diameter of the substrate is about 300 mm, it expands by about 0.3 mm in the plane direction after the first heat treatment. Further, the variation in the amount of dimensional change is about ⁇ 5 ⁇ m.
- the correction amount at the predetermined through-hole formation scheduled position on the photosensitive glass substrate is 0 to 0. 0 with respect to the distance between the center point of the photosensitive glass substrate and the predetermined through-hole formation planned position before the heat treatment. It is in the range of 3%.
- the accuracy of the through hole formation position can be improved as in the above-described embodiment.
- the correction amount is set based on the relationship between the distance from the center point O of the photosensitive glass substrate and the dimensional change amount.
- the correction amount may be set by another method. For example, a plurality of dimensional change measurement substrates may be heat treated to calculate a deviation (dimensional change) at a predetermined coordinate on each substrate, and the average value may be set as a correction amount.
- the through hole is formed as the fine processing for the base material made of the photosensitive glass.
- other fine processing may be performed.
- the bottomed hole may be formed by forming the latent image halfway through the base material.
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Abstract
Description
感光性ガラスから構成される板状基材に直接的にエネルギービームを照射して潜像を形成する照射工程と、
第1熱処理により潜像を結晶化して結晶化部分を得る結晶化工程と、
結晶化部分を溶解除去して微細加工を行い、感光性ガラス基板を得る微細加工工程と、
を有し、
照射工程において、少なくとも第1熱処理を含む熱処理に起因する感光性ガラスの寸法変化量に基づいて、エネルギービームの照射位置を補正する感光性ガラス基板の製造方法である。
1.感光性ガラス基板
2.感光性ガラス基板の製造方法
3.本実施形態の効果
4.変形例等
感光性ガラス基板としては、感光性ガラスから構成されていれば特に制限されない。本実施形態では、感光性ガラス基板は板状であり、用途に応じて、円形板状であってもよいし、長方形あるいは正方形等の矩形板状であってもよい。
本実施形態では、感光性ガラスから構成される基材に、潜像を形成し該潜像が結晶化された後に溶解除去されて貫通孔が形成されることにより、上記の感光性ガラス基板が製造される。具体的な方法は図1を用いて説明する。
次に、図1(b)に示すように、照射工程では、基材11において、貫通孔となるべき部分(以下、貫通孔形成予定部分16ともいう)に潜像17を形成する。この潜像17は、フォトマスクを介することなく、照射源51からエネルギービーム50を基材11に直接的に照射することにより形成される。すなわち、図1(b)に示すように、エネルギービーム50の照射時には、エネルギービームの照射源51を、図示しない公知の移動機構により制御しながら、貫通孔形成予定部分16にエネルギービーム50を順次照射し潜像17を形成していく。
続いて、潜像が形成された基材に対して第1熱処理を行う。第1熱処理は、潜像を結晶化部分とするために行われる処理である。照射工程において、レーザー光が照射されて形成された潜像では、感光性成分(Au等)と増感成分(Ce等)との間の酸化還元反応により生じた感光性成分の金属が存在している。
貫通孔形成工程では、図1(d)に示すように、形成された結晶化部分18を、HF(フッ化水素)を用いてエッチングにより溶解除去し、貫通孔15を形成する。結晶化部分18、すなわち、リチウムモノシリケートは、結晶化していないガラス部分に比べて、フッ化水素に溶解しやすい。具体的には、結晶化部分18と結晶化部分以外のガラス部分との溶解速度の差は約50倍である。したがって、この溶解速度の差を利用して、フッ化水素をエッチング液として用い、たとえば、図示しないスプレーエッチングにより、フッ化水素を基材11の両面に吹き付けることにより、結晶化部分18が溶解して除去され貫通孔15が形成される。すなわち、基材11に対して選択的エッチングを行うことにより貫通孔15を形成できる。
本実施形態では、貫通孔15を形成した感光性ガラス基板10に対して、第2熱処理を行い、感光性ガラスの改質を行う。具体的には、第2熱処理は、第1熱処理よりも高い温度、たとえば、800~1200℃の範囲で行われる。この第2熱処理により、図1(e)に示すように、感光性ガラス全体にリチウムダイシリケートの結晶が析出し、感光性ガラスが改質され、結晶化感光性ガラス基板10aとなる。結晶化感光性ガラスは、改質を行っていない感光性ガラスよりも、機械的特性、化学的耐久性等に優れている。以降、結晶化感光性ガラスを、単に感光性ガラスともいう。
上述したように、感光性ガラス基板に対する露光は、露光すべきパターン(たとえば、貫通孔形成予定部分)に対応するマスクパターンを有するフォトマスクを介して行うことが多い。しかしながら、フォトマスクを介した露光では、特に、基板サイズが大きくなり、パターニング(たとえば、貫通孔の形成)が微細化すると、パターニングの精度(たとえば、貫通孔の形成位置のずれ)が悪化するという新たな問題が顕在化してしまう。この問題は、感光性ガラス特有の性質に起因する問題である。
熱処理に起因する感光性ガラス基板の寸法変化量は大きく、該基板に微細な加工(たとえば、微細な貫通孔の形成)を行う場合には、加工精度が問題となっていた。具体的には、基板に貫通孔を形成する場合、貫通孔の実際の形成位置と所定の形成予定位置とにずれが生じ易くなってしまう。
上述した実施形態では、貫通孔が形成された感光性ガラス基板を第2熱処理により改質して得られる結晶化感光性ガラス基板について説明したが、第2熱処理を行わない感光性ガラス基板についても、同様に照射位置の補正を行うことができる。
11…基材
15…貫通孔
16…貫通孔形成予定部分
17…潜像
18…結晶化部分
31~38…基準マーク
50…エネルギービーム
Claims (5)
- 感光性ガラスから構成される板状基材に直接的にエネルギービームを照射して潜像を形成する照射工程と、
第1熱処理により前記潜像を結晶化して結晶化部分を得る結晶化工程と、
前記結晶化部分を溶解除去して微細加工を行い、感光性ガラス基板を得る微細加工工程と、を有し、
前記照射工程において、少なくとも前記第1熱処理を含む熱処理に起因する前記感光性ガラスの寸法変化量に基づいて、前記エネルギービームの照射位置を補正することを特徴とする感光性ガラス基板の製造方法。 - 前記熱処理が、前記微細加工工程後に、前記感光性ガラス基板に行われる第2熱処理を含むことを特徴とする請求項1に記載の感光性ガラス基板の製造方法。
- 前記感光性ガラス基板上の所定の点において、前記寸法変化量に基づいて算出される補正量が、前記感光性ガラス基板の中心点と、前記熱処理前の前記所定の点と、の距離に対して0~0.3%の範囲内であり、
前記感光性ガラス基板の前記中心点は、前記感光性ガラス基板の重心であることを特徴とする請求項1に記載の感光性ガラス基板の製造方法。 - 前記感光性ガラス基板上の所定の点において、前記寸法変化量に基づいて算出される補正量が、前記感光性ガラス基板の中心点と、前記熱処理前の前記所定の点と、の距離に対して0~-2%の範囲内であり、
前記感光性ガラス基板の前記中心点は、前記感光性ガラス基板の重心であることを特徴とする請求項2に記載の感光性ガラス基板の製造方法。 - 前記微細加工工程が、前記結晶化部分を溶解除去して貫通孔を形成する貫通孔形成工程であり、
前記感光性ガラス基板の径が100mm以上であり、かつ前記貫通孔の径が100μm以下であることを特徴とする請求項1から4のいずれかに記載の感光性ガラス基板の製造方法。
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JPH02255542A (ja) * | 1989-03-29 | 1990-10-16 | Hoya Corp | 感光性ガラスのパターン形成方法 |
WO2005033033A1 (ja) * | 2003-10-06 | 2005-04-14 | Hoya Corporation | 貫通孔を有するガラス部品およびその製造方法 |
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JPH02255542A (ja) * | 1989-03-29 | 1990-10-16 | Hoya Corp | 感光性ガラスのパターン形成方法 |
WO2005033033A1 (ja) * | 2003-10-06 | 2005-04-14 | Hoya Corporation | 貫通孔を有するガラス部品およびその製造方法 |
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