CN100526986C - Optical projection exposure device - Google Patents
Optical projection exposure device Download PDFInfo
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- CN100526986C CN100526986C CNB2005100735704A CN200510073570A CN100526986C CN 100526986 C CN100526986 C CN 100526986C CN B2005100735704 A CNB2005100735704 A CN B2005100735704A CN 200510073570 A CN200510073570 A CN 200510073570A CN 100526986 C CN100526986 C CN 100526986C
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Abstract
An optical magnification adjustment system being capable of minutely correcting magnification is disclosed. A first lens 1 of plano-convex is installed on the side of an object surface 5, and a second lens 2 of concave-plano is installed on the side of a formed image surface 7. By controlling the center space d between the first lens and the second lens, the image is enlarged or reduced. The radii of curvature R2 and R3 of the convex surface of the first lens and the concave surface of the second lens are respectively set according to the following equations. R2=(1-n1)/phi2 R3=(n2-1)/phi3 where, phi2 and phi3 represent optical power, and n1 and n2 represent refraction indexes, respectively.
Description
The application be that November 19, application number in 2002 are 02149456.8 the applying date, denomination of invention divides an application for the application for a patent for invention of " optical magnification adjustment system and apparatus for projection exposure ".
Technical field
The present invention relates to optical magnification adjustment system and apparatus for projection exposure.
Background technology
Photoetching process is widely used in each field, and in this method, exposure sources utilizes photography that the figure of regulation is printed on the substrate surface that has sprayed such as the photosensitive material of photoresist, after this utilizes etching process that this figure is formed on the substrate.Also utilize recent years exposure sources to make printed circuit board (PCB).Because the requirement to high speed operation, multifunctionality and the miniaturization of electronic equipment is more and more higher, so more and more higher to the requirement of multilayer, intensive and the micro-property of printed circuit board (PCB).
Especially in making the multilayer board process, to graph exposure the time, figure and the figure on another layer on requiring every layer have high alignment precision.
As mentioned above, along with the development of further miniaturization of printed circuit board (PCB) and multiple stratification trend, again can not ignore the expansion and the contraction that cause printed circuit board (PCB) itself to produce because the Copper Foil of formation printed circuit board (PCB) is different with the expansion coefficient of epoxy resin.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can or shrink the optical magnification adjustment system and the apparatus for projection exposure of the magnification of regulating projected image according to the expansion of printed circuit board (PCB).
According to one embodiment of the present invention, a kind of being used for comprises the optical projection printing equipment that circuitous pattern is printed on the printed circuit board (PCB): photomask, has compulsory figure, projection arrangement, be used for described photomask pattern is projected to described printed circuit board (PCB), light source, by described projection arrangement radiation exposure ray, thereby described photomask pattern is printed on the described printed circuit board (PCB), and optical magnification adjustment system, be installed between described photomask and the described printed circuit board (PCB), thereby proofread and correct the magnification of described figure at least at an any direction.
Preferred embodiment according to optical magnification adjustment system of the present invention has two lens: first lens are plano-convex lens or plano-concave lens, have refractive power φ 2, by following equation definition; And second lens, be recessed plano lens or protruding plano lens, have refractive power φ 3, by following equation definition, they all are installed in the heart far away position for the treatment of projection object plane side or projected image side of projection arrangement, and can accurately regulate the total system magnification of described optical magnification adjustment system.
φ3＝-Φ(S1+e1)/d0
φ2＝(Φ-φ3)/(1-d0φ3)
Φ wherein: the refractive power of described optical magnification adjustment system,
S1: from the distance of first surface to an object plane 5 (being photomask face (photo masksurface)) of described first lens,
D0: satisfy the Center Gap between described two lens of magnification β=1,
E1=t1/n1 (t1 wherein: the center thickness of described first lens, n1: the refractive index of described first lens).
Utilize said system configuration, can be by being that the center is improved or reduced by two Center Gap between the lens and regulate magnification β with d0, the therefore accurate magnification of calibrating optical magnification regulating system, thereby high precision amplification or reduced projection image.
In addition, inserting under the situation of parallel surface that head center's thickness with described two lens has same thickness, wishing to proofread and correct according to its purpose in advance the optical aberration of described optical magnification adjustment system.
By making described two lens is cylindrical, can also be by regulating Center Gap d in the same way as described above, only come a direction, perhaps vertically, perhaps at the cross-level magnification at image.
In order to realize the achromatism condition, wish to make the abbe number υ 1 of described two lens and υ 2 satisfy following equation.
Description of drawings
Fig. 1 is the schematic diagram of the embodiment of optical magnification adjustment system according to the present invention;
Fig. 2 is a synoptic diagram of explaining the principle of operation of the embodiment of optical magnification adjustment system according to the present invention;
Fig. 3 is the schematic diagram according to the embodiment of apparatus for projection exposure of the present invention;
Fig. 4 is the synoptic diagram of explanation according to the principle of operation of another embodiment of optical magnification adjustment system of the present invention;
Fig. 5 is the synoptic diagram of explanation according to the principle of operation of another embodiment of optical magnification adjustment system of the present invention;
Fig. 6 is the synoptic diagram of explanation according to the principle of operation of another embodiment of optical magnification adjustment system of the present invention.
Embodiment
Referring now to description of drawings the present invention.
Fig. 1 illustrate be installed in the apparatus for projection exposure that is used to make printed circuit board (PCB), according to optical magnification adjustment system A of the present invention.
Utilize optical magnification adjustment system A, according to predetermined magnification, at all directions or predetermined direction, to carrying out meticulous amplification by the object plane mask face, that treat projection 5 rays that transmit, frequency of exposure or dwindling as photomask, utilize optical exposure system 6 then, it is amplified or dwindle according to normal projection's magnification, at last image is formed on the imaging surface 7 of printed circuit board (PCB).After a while, will be with reference to figure 3 explanation apparatus for projection exposure.
Optical magnification adjustment system A comprises first lens 1 and second lens 2, and by regulating its magnification of distance adjustment between first lens 1 and second lens 2.In addition, by adopting cylindrical lens, only can realize in the amplification of a predetermined direction or dwindle as first lens 1 and second lens 2.
This magnification can be set to compensate with expansion or contraction to printed circuit board (PCB).
Suppose optical magnification adjustment system A is installed in the telecentric optical system.In this embodiment, it is installed between object plane 5 and the optical exposure system 6.
Fig. 2 illustrates the detailed structure of optical magnification adjustment system A.
In this embodiment, first lens 1 that are installed in object plane one side are plano-convex lenss, and second lens 2 that are installed in imaging surface 7 one sides are recessed plano lens.In addition, first lens can also be plano-concave lenss, and second lens 2 can also be protruding plano lens.
By changing the Center Gap d between first lens 1 and second lens 2, can amplify or dwindle.That is to say, by when Center Gap d is d0 initially magnification be set to equimultiple, by near d0, changing Center Gap d, can improve or reduce magnification.
For this operating process,, the radius of curvature R 2 and the R3 of the concave surface of the convex surface of first lens 1 and second lens 2 is set respectively according to following equation 1 and 2.These equatioies are not only effective when first lens 1 are recessed plano lens for plano-convex lens second lens, and effective when first lens 1 are protruding plano lens for plano-concave lens second lens 2.
R2=(1-n1)/φ 2 equatioies 1
R3=(n2-1)/φ 3 equatioies 2
Wherein φ 2 and φ 3 represent refractive power respectively, and n1 and n2 represent refractive index respectively.
Above-mentioned equation 1 and equation 2 are to obtain like this:
As shown in Figure 2, establish the curvature of face radius that R1 and R2 represent first lens 1 respectively, R3 and R4 represent the curvature of face radius of second lens 2 respectively, the refractive power (that is: the inverse of focal length) of φ 1, φ 2, φ 3 and φ 4 expression respective face.
In addition, establish center thickness and refractive index that t1 and n1 represent first lens 1 respectively, t2 and n2 represent the center thickness and the refractive index of second lens 2 respectively, and d represents the Center Gap between first lens 1 and second lens 2.If S1 represents first R1 of first lens 1 and the distance between the object plane 5 (that is: photomask face), Sk represents second R4 of second lens 2 and the distance between the image planes 50 (that is: the virtual image of photomask face).
If the total dioptric power of the whole optical magnification adjustment system of Φ (that is: the inverse of focal length) expression then utilizes equation 3 can obtain Φ, because, so because R1 and R4 are that plane refractive power φ 1 and φ 4 are 0.
Φ=φ 2+ φ 3-d φ 2 φ 3 equatioies 3
In this example, according to optics paraxonic relation, the magnification β of equation 4 expression optical magnification adjustment systems.
β=-1/[Φ (S1+e1)+d φ 3-1] equation 4
E1=t1/n1 wherein, and
When object plane is positioned at first lens left side, S1〉0.
Then, making d is normal space d0 when magnification β becomes equimultiple (that is: β=1), then obtains equatioies 5 by equation 4, and tries to achieve φ 3.
By equation 5 substitution equatioies 3, can be in the hope of φ 2:
Since determined φ 2 and φ 3, thus can try to achieve radius of curvature R 2 and R3 respectively from the refractive index of these two lens, shown in following equation 1 and 2.
R2=(1-n1)/φ 2 equatioies 1
R3=(n2-1)/φ 3 equatioies 2
The total dioptric power Φ of optical magnification adjustment system can be set in the heart degree range of tolerable variance far away of optical exposure system.In other words, can be appointed as the focal length of optical magnification adjustment system with falling into an interior long-focus of the determined heart degree range of tolerable variance far away of optical exposure system operating conditions.
If give this focal length big negative (-) value, this system becomes plano-convex+recessed flat combination, yet if give this focal length big just (+) value, then this system becomes plano-concave+protruding flat combination.
Try to achieve Φ by φ 2 and φ 3, and by with φ and φ 3 substitution equatioies 4, utilize the following equation can be in the hope of β from above-mentioned acquisition.
β=-1/[(φ 2+ φ 3-d φ 2 φ 3) (S1+e1)+d φ 3-1] equation 4 '
E1=t1/n1 wherein.
So shown in the equation, magnification β changes with the spacing d between first lens 1 and second lens 2, therefore, can proofread and correct magnification β by changing spacing d.
In addition, by spacing d, also can proofread and correct the magnification β of the total system that comprises optical exposure system.
In this example, the spacing d between first lens and second lens equals at 0 o'clock, determines the magnification accommodation limit of optical magnification adjustment system, and can be by above-mentioned equation 4 ' the following magnification (β=β 0) of trying to achieve.
β 0=-1/[(φ 2+ φ 3) (S1+e1)-1] equation 4 "
In the above-described embodiments, along with the variation of the spacing d between these two lens, magnification changes with same speed horizontal and vertical, because the R2 of first lens 1 and second lens 2 and R3 are all based on sphere.This system configuration is suitable for magnification is carried out multidirectional correction so that the temperature variation in the optical exposure system is compensated.
Except the foregoing description, the face R2 and the R3 of first lens 1 and second lens 2 can also adopt cylinder respectively.
In this case, in the segment of a cylinder direction, face R2 and R3 become parallel surface, and the magnification of generatrix direction becomes equimultiple, and and the spacing d between first lens 1 and second lens 2 irrelevant.That is to say that the magnification of generatrix direction does not change.
On the other hand, at the horizontal direction of segment of a cylinder, the above-mentioned theory equation is effective in the same old way.Therefore, can be only at the horizontal change magnification of segment of a cylinder.That is to say, by changing the spacing d between first lens 1 and second lens 2, can be that the center dwindles or amplification correction with normal space d0 (β=1).
The plate of printed circuit board (PCB) and other similar type may be only expands or shrinks in a direction relevant with subsequent processes.Using cylinder can effectively compensate this directional expansion or contraction.
After transmitting ray,, can utilize the image planes 50 of equation 7 expression objects and the variation between the face R4 apart from Sk according to the paraxonic relation by optical magnification adjustment system.
Sk=[(1-d φ 3) S1+d]/[Φ S1-(1-d φ 3)] equation 7
According to this equation, the at interval moving range of d that settles the standard by this way, so that when normal space d0 is set to benchmark, with the difference of distance Sk in the depth of focus range of tolerable variance of exposure system.
In addition, because optical magnification adjustment system according to the present invention is the convex-concave relation, that is to say that it is Fu Langhuofu (Fraunhofer) type system, so this optical magnification adjustment system can be an achromatic system.
For example, if the refractive index of achromatism wavelength a and b be set to (nla, nlb) and (n2a, n2b), then by definition abbe number υ 1 and υ 2 shown in equation 8 and 9,
By suitably select υ 1 and υ 2 in equation 10, this system can be achromatic.
As mentioned above, by regulating according to the spacing between the lens in the optical magnification adjustment system of the present invention, can meticulous adjusting magnification.
Now, will describe apparatus for projection exposure shown in Fig. 1 in detail with reference to figure 3.
Fig. 3 illustrates following process: receive the printed circuit board (PCB) W of photoresist coated, this printed circuit board (PCB) W be placed on the worktable 14 of exposure sources, print circuitous pattern that photomask 11 draws etc. and printed circuit board (PCB) W is sent to next processing procedure from last processing procedure.
In order to aim at, worktable 14 can move in X, Y, Z direction and with the θ angle.
Facing to printed circuit board (PCB) W photomask 11 is installed, and, light source 13 is installed facing to the opposite side of photomask 11 with respect to printed circuit board (PCB) W, this light source with the x ray irradiation x of preset frequency to photomask 11.
Projecting lens 12 is arranged between photomask 11 and the printed circuit board (PCB) W, like this by amplifying according to predetermined magnification or dwindling, with the graphic projection on the photomask 11 to printed circuit board (PCB) W.
In this embodiment, because utilize figure on the projecting lens 12 projected light masks 11, so photomask 11 can be realized miniaturization.In addition, by travelling table 14, can be to printed circuit board (PCB) W with a plurality of graphic projections.
In addition, although arrange photomask 11 and printed circuit board (PCB) W from top to bottom, be not limited to this arrangement at this page or leaf.Can also arrange in the opposite direction, perhaps arrange photomask 11 and printed circuit board (PCB) W with vertical direction.
In addition, can also mobile photomask 11, and mobile printing circuit board W not, perhaps move them the two.
Because described optical magnification adjustment system A is installed between described photomask 11 and the described projecting lens 12, so can or dwindle and proofread and correct to the amplification of figure.
In the above-described embodiments, can change magnification by changing Center Gap d, but can also be set to constant, simplify the system configuration of optical magnification adjustment system A by magnification.
Fig. 4 and Fig. 5 illustrate the embodiment of this optical magnification adjustment system A.This embodiment of optical magnification adjustment system adopts pair of parallel face 20.As shown in Figure 4 and Figure 5, come crooked parallel surface 20 according to quafric curve respectively, thereby form cylinder.On ray passage, parallel surface 20 is installed between photomask 11 and the projecting lens 12, the bus of parallel surface 20 is aimed at the desired directions of amplifying or dwindle.
Utilize this system configuration, the infinite ray that light source 13 sends enters parallel surface 20 by photomask 11, and only it was amplified or dwindles in a direction before this infinite ray is sent to the outside, as shown in Figure 4, thereby changes projection magnification ratio.
Therefore, aim at by the bus that makes parallel surface 20 vertical or horizontal, make vertical or horizontal amplify or dwindle become possibility.
As shown in Figure 5, by two parallel surfaces 20 of orthogonal arrangement (that is: its bus crosses one another with an angle of 90 degrees), can amplify or dwindle in 90 degree directions.In this system configuration, aim at the vertical and horizontal of printed circuit board (PCB) W by making each bus, can amplify at the vertical and horizontal both direction of printed circuit board (PCB) W or dwindle.
Replace parallel surface 20, can also adopt cylindrical lens 21, as shown in Figure 6.Adopt the combination of using two cylindrical lens 21 parallel surface 20 by resembling, can amplify at the vertical and horizontal both direction of printed circuit board (PCB) W or dwindle.
In next processing procedure, the adjusting magnification that can determine parallel surface 20 and cylindrical lens 21 according to expansion or the shrinkage degree of printed circuit board (PCB) W.That is to say,, can change magnification by changing the cylindrical lens of different refractive powers.
As mentioned above, wish to install the optical magnification adjustment system A that has compensated optical aberration in advance.In addition, optical magnification adjustment system A is arranged on the heart position so-called far away of ray passage.
As mentioned above, described apparatus for projection exposure can expose according to expansion or the contraction of described printed circuit board (PCB) W.
Claims (5)
1. an optical projection printing equipment is used for circuitous pattern is printed on printed circuit board (PCB), and this optical projection printing equipment comprises:
Photomask has compulsory figure,
Projection arrangement is used for described photomask pattern is projected to described printed circuit board (PCB),
Light source by described projection arrangement radiation exposure ray, thereby is printed on described photomask pattern on the described printed circuit board (PCB), and
Optical magnification adjustment system is installed between described photomask and the described printed circuit board (PCB), thereby extremely
Lack the magnification of proofreading and correct described figure at an any direction, wherein:
Described optical magnification adjustment system has: first plano-convex lens or plano-concave lens have refractive power φ 2, by following equation definition; And the second recessed flat or protruding plano lens, has refractive power φ 3, by following equation definition, they all are installed in the heart far away position of the object plane side or the image-side of described projection arrangement, wherein by changing the total system magnification that spacing between the described lens can the described optical magnification adjustment system of meticulous change
φ3＝-Φ(S1+e1)/d0
φ2＝-(Φ-φ3)/(1-d0φ3)
Φ wherein: the total dioptric power of described optical magnification adjustment system,
S1: from first of described first lens to object plane, i.e. photomask face, distance,
D0: satisfy the Center Gap between described two lens of magnification β=1,
E1=t1/n1, t1: the center thickness of described first lens, n1: the refractive index of described first lens.
2. optical projection printing equipment according to claim 1, wherein:
Described two lens are cylindrical lens.
3. optical projection printing equipment according to claim 1, wherein:
The abbe number υ 1 of described two lens and υ 2 are set satisfying following equation,
4. optical projection printing equipment according to claim 1, wherein:
Described optical magnification adjustment system is proofreaied and correct described magnification at printed circuit board (PCB) one of vertical or horizontal at least.
5. optical projection printing equipment according to claim 1, wherein:
Described optical magnification adjustment system is a telecentric optical system.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP355425/2001 | 2001-11-21 | ||
| JP2001355425 | 2001-11-21 | ||
| JP356784/2001 | 2001-11-22 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021494568A Division CN1226671C (en) | 2001-11-21 | 2002-11-19 | Optical amplification regulating system and projection exposure apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN1721995A CN1721995A (en) | 2006-01-18 |
| CN100526986C true CN100526986C (en) | 2009-08-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100735704A Expired - Lifetime CN100526986C (en) | 2001-11-21 | 2002-11-19 | Optical projection exposure device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102725696A (en) * | 2009-11-20 | 2012-10-10 | 康宁股份有限公司 | Magnification control for lithographic imaging system |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110459947B (en) * | 2019-08-27 | 2020-09-29 | 南昌航空大学 | High-precision plane-concave laser cavity single optical path alignment device and method |
| CN110459946B (en) * | 2019-08-27 | 2020-09-29 | 南昌航空大学 | Flat-concave laser cavity double-optical-path alignment device and method based on Gaussian beam |
| CN110459948B (en) * | 2019-08-27 | 2020-09-29 | 南昌航空大学 | High-precision plano-concave laser cavity double-light path alignment device and method |
-
2002
- 2002-11-19 CN CNB2005100735704A patent/CN100526986C/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102725696A (en) * | 2009-11-20 | 2012-10-10 | 康宁股份有限公司 | Magnification control for lithographic imaging system |
| CN102725696B (en) * | 2009-11-20 | 2014-12-10 | 康宁股份有限公司 | Magnification control for lithographic imaging system |
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| Publication number | Publication date |
|---|---|
| CN1721995A (en) | 2006-01-18 |
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Granted publication date: 20090812 |