Abstract:
A projection optical system comprises a first lens group with positive power, a second lens group with negative power, a third lens group with positive power, a fourth lens group with negative power, and a fifth lens group with positive power. At least one of the first, second, and third lens group has an aspherical surface. A lens arrangement of one embodiment has a plurality of waists of lenses, with aspherical surface before and after a first waist.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation of U.S. application Ser. No. 09/531,009 filed Mar. 20, 2000, now U.S. Pat. No. 6,538,821 which is a continuation-in-part of International Application No. PCT/JP98/04263 filed Sep. 22, 1998. 
    
    
     This application claims the benefit of Japanese Patent application No.9-276499 which is hereby incorporated by reference. 
     BACKGRAOUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a projection optical system which is employed when a pattern such as an electric circuit pattern drawn on a projection original plate including a reticle or a mask is transferred onto a photosensitive substrate such as a semiconductor wafer or a glass plate coated with photosensitive material by projection photolithography. 
     2. Related Background Art 
     Recently, a projection exposure method is fairly generally employed for transferring a necessary pattern onto an integrated circuit such as an IC or a LSI etc., a flat display of such as a liquid crystal etc. 
     Especially, for manufacturing a semiconductor integrated circuit or a substrate packaging a semiconductor chip therein, a pattern thereof is increasingly miniaturized and a wider projection area is required for a flat display for liquid crystals, or the like. Consequently, an exposure apparatus, especially a projection optical system thereof, for printing such patterns is required to have a higher resolving power and a wider exposure area. 
     However, any of projection optical systems conventionally employed in an exposure apparatus does not fully satisfy both of such requirements, i.e., a higher resolving power and a wider exposure area. 
     More specifically, for obtaining a higher resolving power, it is required to enlarge the numerical aperture of the optical system, which inevitably results in an enlarged lens size. In the same manner, in order to obtain a wider exposure area, the lens size is still enlarged since a flat object is to be projected on a flat surface. If the lens size is enlarged, a glass material for the lens is required to have a larger size. However, it becomes difficult to prepare a glass material having a lager size than the current one in terms of the homogeneity of the material, or the like. An enlarged lens size makes another difficulty in a step of polishing the glass material, and it becomes impossible to polish a lens having a larger size than the present one. Under such circumstances, it is an important object to be achieved up to now to reduce the maximum effective diameter of lens of the optical system, while securing a large numerical aperture. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to provide a projection optical system which has a large numerical aperture and a satisfactorily reduced maximum effective diameter of lens of the optical system. 
     The present invention has been contrived to solve the above-mentioned problem. According to the present invention, there is provided a projection optical system for projecting an image on a first surface onto a second surface, comprises first lens group G 1  of positive refracting power including two or more positive lenses, a second lens group G 2  of negative refracting power including two or more negative lenses, a third lens group G 3  of positive refracting power including three or more positive lenses, a fourth lens group G 4  of negative refracting power including two or more negative lenses, and a fifth lens group G 5  of positive refracting power including at least six or more consecutive positive lenses, in the named order from the first surface side to the second surface side, wherein either one of the fourth lens group G 4  and the fifth lens group G 5  has one aspherical surface, the fifth lens group G 5  has an aperture stop inside thereof, a portion at which a light flux is diverged right before the aperture stop has a first air lens LA of negative refracting power, the radius of curvature rA 1  of the lens surface on the first surface side of the first air lens LA is positive, and a portion at which the light flux is converged at the rear of the aperture stop has a second air lens LB of negative refracting power. 
     In the projection optical system of the present invention, an aspherical surface is introduced to correct a spherical aberration which is generated due to an enlargement of the numerical aperture. This aspherical surface is to be applied to a portion at which mainly spherical aberration is generated and, more naturally, to a portion at which the spherical aberration can be easily corrected. Consequently, the aspherical surface is to be applied to a portion in the vicinity of the aperture stop. According to the present invention, since the aperture stop is provided in the fifth lens group G 5 , the aspherical surface is to be applied to the fifth lens group G 5  which has this aperture stop therein or to the fourth lens group G 4  near the aperture stop. 
     However, it is more preferable that the aspherical surface should be applied to the portion at which the light flux is converged, in order to avoid the aspherical lens surface from being enlarged. Consequently, in first and second embodiments described below, one surface out of the fourth lens group G 4  is selected as the aspherical surface. 
     Since one of the surfaces is used as the aspherical surface, it is possible to correct a spherical aberration. However, it is also required to correct other aberrations which may be generated due to an enlargement of the numerical aperture. 
     The projection optical system has not only a high numerical aperture but also a large field size, so that there are generated larger aberrations around the image field. Especially, a coma aberration around the image field is generated to be larger due to the enlargement of the numerical aperture. Further, an amount of a generated coma is normally different depending of an amount of enlargement of the field angle (i.e., increase of the image height). This is called a field angle fluctuation component of a coma aberration. 
     In order to remove this field angle fluctuation component of the coma aberration, a more complicated correction is required to be conducted. In general, at least another two aspherical surfaces are required for correcting an upper coma and a lower coma, respectively. However, employment of a large number of aspherical surfaces brings about an increase in the cost undesirably. Then, according to the present invention, the field angle fluctuation component of the coma aberration is corrected by a spherical surface, a method of which will be described below. 
     Generally, in an optical system, the smaller an angle at which a light beam is incident onto each lens surface is, the less aberrations are generated and the more loosen a tolerance or the like becomes, appropriately. Especially, such tendency is strong in an optical system which pursuits the extreme performance of a projection optical system or the like. 
     However, according to the present invention, there are provided surfaces acting against the light beam to make an angle of incidence large, conversely. These surfaces are a lens surface rA 1  on the first surface side of the first air lens LA and a lens surface rB 2  on the second surface side of the second air lens LB. Since these air lenses LA, LB are provided in the portions in which the light flux is diverged and the light flux is converged to sandwich the aperture stop therebetween, so that the field angle fluctuation components of the upper coma and the lower coma can be corrected. 
     Though a considerable amount of aberrations is normally generated on such surfaces oriented to act against light fluxes, converse aberrations are caused by the curved surfaces existing in front or rear thereof and having a similar curvature, that is, the lens surface rA 2  on the second surface side of the first air lens LA and the lens surface rB 1  on the first surface side of the second air lens LB, so that high order aberrations are corrected by a difference therebetween. 
     With the above arrangement, the field angle fluctuation component of coma is corrected. As a result, it becomes possible to reduce the maximum effective diameter of lens. 
     Next, according to the present invention, it is preferable to satisfy the following conditions: 
     
       
         0.1&lt; D/L&lt; 0.3;  (1) 
       
     
     
       
           |PA−PB|×L&lt; 1.0;  (2) 
       
     
      0.2&lt; |PA|×L&lt; 2.0;  (3) 
     
       
         0.2&lt; |PB|×L&lt; 2.0;  (4) and 
       
     
     
       
         0.01&lt; Y/L&lt; 0.02,  (5) 
       
     
     where 
     D=tan θ×f 5 ; 
     θ=sin  −1  [NA/n 1 ]; 
     NA: the image side maximum numerical aperture; 
     nI: the index of refraction of a medium which fills a space between the final lens surface and the second surface; 
     f 5 : the focal length of the fifth lens group; 
     L: the distance from the first surface to the second surface; 
     PA: the refracting power of the first air lens LA; 
     PB: the refracting power of the second air lens LB; and 
     Y: the maximum image height. 
     Since D provides an almost maximum effective diameter of lens in the condition (1), the condition (1) defines an appropriate range for the maximum effective diameter of lens on the basis of the distance L between the first surface and the second surface. Below the lower limit of the condition (1), the maximum effective diameter of lens becomes smaller, but a satisfactorily large numerical aperture can not be obtained. Conversely, above the upper limit of the condition (1), the maximum effective diameter of lens becomes excessively large, which requires a larger amount of the glass material, resulting in an increase in the cost. 
     The condition (2) provides a difference between the refracting power PA of the first air lens and the refracting power PB of the second air lens on the basis of the distance L between the first surface and the second surface. Above the upper limit of the condition (2), there is too large difference generated between the refracting powers of the both air lenses, so that the field angle fluctuation components of the upper coma and the lower coma can not be corrected at a time. 
     Note that the refracting powers PA, PB of the first and second air lenses are defined as follows: 
     
       
           PA= ( nA   1 −1)/ rA   1 +(1 −nA   2 )/ rA   2 ; 
       
     
     
       
           PB= ( nB   1 −1)/ rB   1 +(1 −nB   2 )/ rB   2 ; 
       
     
     nA 1 : the index of refraction of a medium on the first surface side of the first air lens LA; 
     rA 1 : the radius of curvature on the first surface side of the first air lens LA; 
     nA 2 : the index of refraction of a medium on the second surface side of the first air lens LA; 
     rA 2 : the radius of curvature on the second surface side of the first air lens LA; 
     nB 1 : the index of refraction of a medium on the first surface side of the second air lens LB; 
     rB 1 : the radius of curvature on the first surface side of the second air lens LB; 
     nB 2 : the index of refraction of a medium on the second surface side of the second air lens LB; and 
     rB 2 : the radius of curvature on the second surface side of the second air lens LB. 
     The conditions (3) and (4) respectively provide the refracting powers PA, PB of the first and second air lenses on the basis of the distance L between the first surface and the second surface. Below the lower limit of the condition (3) or (4), the field angle fluctuation component of the upper coma or the lower coma can not be fully corrected. Conversely, above the upper limit of the condition (3) or (4), a curvature difference between the lens surfaces on the entrance side and on the exit side of the first or second air lens becomes too large, so that a high order aberration can not be satisfactorily corrected. 
     The condition (5) provides an appropriate display image field size on the basis of the distance L between the first surface and the second surface. Below the lower limit of the condition (5), the lens has the diameter unsuitably large for the reduced image field size, which is undesirable. On the other hand, above the upper limit of the condition (5), the image field size becomes too small, resulting in difficulty in aberration correction. 
     According to the present invention, it is also preferable to satisfy the following conditions: 
     
       
         NA&gt;0.65;  (6) 
       
     
      0.05&lt; f   2 / f   4 &lt;6;  (7) 
     
       
         0.01&lt; f   5 / L&lt; 1.2;  (8) 
       
     
     
       
         −0.8&lt; f   4 / L&lt;− 0.008;  (9) and 
       
     
     
       
         −0.5&lt; f   2 / L&lt;− 0.005,  (10) 
       
     
     where 
     NA: the maximum numerical aperture on the image side; 
     f 2 : the focal length of the second lens group; 
     f 4 : the focal length of the fourth lens group; 
     f 5 : the focal length of the fifth lens group; and 
     L: the distance between the first surface and the second surface. 
     The condition (6) provides an appropriate range for the maximum numerical aperture NA on the image side. According to the present invention, it is provided a projection optical system capable of obtaining a large numerical aperture even if the effective diameter of lens is small. As a result, below the lower limit of the condition (6), the effect of the present invention can not be fully obtained. 
     The condition (7) provides an appropriate range for a ratio between the refracting powers of the fourth lens group G 4  of negative refracting power and the second lens group G 2  of negative refracting power, in order to correct excellently a curvature of field while maintaining a wide exposure area by approximating a Petzval sum to zero. Below the lower limit of the condition (7), the refracting power of the fourth lens group G 4  becomes relatively weak to the refracting power of the second lens group G 2 , so that a large positive Petzval sum is undesirably generated. 
     On the other hand, above the upper limit of the condition (7), the refracting power of the second lens group G 2  becomes weak relative to the refracting power of the fourth lens group G 4 , so that a large positive Petzval sum is undesirably generated. 
     The condition (8) provides an appropriate range for the refracting power of the fifth lens group G 5  of positive refracting power, in order to correct a spherical aberration, a distortion and a Petzval sum in a good balance while maintaining a large numerical aperture. Below the lower limit of the condition (8), the refracting power of the fifth lens group G 5  becomes too large, so that not only a negative distortion, but also negative spherical aberration are generated to be large in the fifth lens group G 5  undesirably. On the other hand, above the upper limit of the condition (8), the refracting power of the fifth lens group G 5  becomes too weak, and the refracting power of the fourth lens group G 4  of negative refracting power inevitably becomes weak correspondingly. As a result, it becomes impossible to correct a positive Petzval sum satisfactorily. 
     The condition (9) provides an appropriate range for the refracting power of the fourth lens group G 4  of negative refracting power. Below the lower limit of the condition (9), it becomes undesirably difficult to correct a spherical aberration. Conversely, above the upper limit of the,condition (9), a coma aberration is generated undesirably. In order to correct a spherical aberration and a Petzval sum satisfactorily, it is preferable to set the lower limit of the condition (9) to −0.078, and it is preferable to set the upper limit of the condition (9) to −0.047 to further suppress generation of a coma aberration. 
     The condition (10) provides an appropriate range for the refracting power of the second lens group G 2  of negative refracting power. Below the lower limit of the condition (10), a Petzval sum becomes a large positive value undesirably. On the other hand, above the upper limit of the condition (10), a negative distortion is undesirably generated. In order to further correct the Petzval sum satisfactorily, it is preferable to set the lower limit of the condition (10) to −0.16. In order to further correct the negative distortion and the coma aberration satisfactorily, it is preferable to set the upper limit of the condition (10) to −0.071. 
     Next, in the present invention, it is preferable to provide at least one negative lens in the fifth lens group G 5 . With this arrangement, a distortion can be excellently corrected. 
     It is also preferable to provide in the fourth lens group G 4  of negative refracting power at least two pairs of concave lens surfaces facing each other. With such arrangement, a light beam can be loosely bent, so that generation of especially a spherical aberration can be suppressed. 
     In the same manner, it is preferable to provide in the second lens group G 2  of negative refracting power at least two pairs of concave lens surfaces facing each other. With such arrangement, a light beam can be loosely bent, so that generation of especially an off-axis aberration can be suppressed. 
     In the same manner, it is preferable to provide in the fifth lens group G 5  of positive refracting power at least one pair of convex lens surfaces facing each other. With such arrangement, a light beam can be loosely bent, so that generation of especially a spherical aberration can be suppressed. 
     In the same manner, it is preferable to provide in the third lens group G 3  of positive refracting power at least one pair of convex lens surfaces facing each other. With this arrangement, a light beam can be loosely bent, so that generation of especially an off-axis aberration can be suppressed. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a cross-sectional view for showing a lens constitution in a first embodiment of a projection optical system according to the present invention. 
     FIGS. 2A to  2 C are aberration views for showing a spherical aberration, an astigmatism and a distortion in the first embodiment. 
     FIGS. 3A to  3 E are aberration views for showing lateral aberrations in the first embodiment. 
     FIG. 4 is a cross-sectional view for showing a lens constitution in a second embodiment. 
     FIGS. 5A to  5 C are aberration views for showing a spherical aberration, an astigmatism and a distortion in the second embodiment. 
     FIGS. 6A to  6 E are aberration views for showing lateral aberrations in the second embodiment. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Embodiments of the present invention will be described with reference to the drawings. FIG.  1  and FIG. 4 respectively show the first embodiment and the second embodiment of the projection optical system according to the present invention. Either of the projection optical systems of the both embodiments is adapted to effect projection-exposure of a pattern on a reticle R onto a wafer W at demagnification(reducing magnification), and is comprised of a first lens group G 1  of positive refracting power, a second lens group G 2  of negative refracting power, a third lens group G 3  of positive refracting power, a fourth lens group G 4  of negative refracting power, and a fifth lens group G 5  of positive refracting power, in the named order from the reticle R side to the wafer W side. In these drawings, a symbol * denotes an aspherical lens surface. 
     In the both embodiments, the projection optical system has a magnification of ¼, in which the numerical aperture NA on the image side is 0.75 and the maximum object height is 52.8 mm, which is the size of the reticle R to expose an area of 74.5 mm×74.5 mm, or of 90 mm×55 mm. 
     All of the optical glasses are made of fused quartz. In the first embodiment  28  lenses in total are used, while in the second embodiment  29  lenses in total are used. Thus, an optical system with excellent performance is provided which is capable of satisfactorily correct a spherical aberration, a coma aberration, an astigmatism, and a distortion in a monochromatic waveform of 248.4 nm of an excimer laser of ultraviolet rays. 
     The maximum effective diameter of the lens unit is about 250 mm and the distance L between the objects is 1148 mm in the first embodiment, while the maximum effective diameter of the lens unit is about 256 mm and the length L between the objects is 1167 mm in the second embodiment. Thus, in either of the both embodiments, it is possible to attain a very compact optical system. 
     The first lens group G 1  in the first embodiment is comprised of a meniscus lens L 1  with its convex surface facing toward the reticle R side, and two convex lenses L 2  and L 3 . 
     The second lens group G 2  is comprised of a meniscus lens L 4  with its convex surface facing toward the reticle R side, two concave lenses L 5  and L 6 , and a meniscus lens L 7  with its convex surface facing toward the wafer W side. The lens surface of the lens L 4  on the wafer W side is an aspherical surface. 
     The third lens group G 3  is comprised of two positive meniscus lenses L 8  and L 9  with their convex surfaces facing toward the wafer W side, a double convex lens L 12 , and a positive meniscus lens L 13  with its convex surface facing toward the reticle R side. 
     The fourth lens group G 4  is comprised of two negative meniscus lenses L 14  and L 15  with their convex surfaces facing toward the reticle R side, two double concave lenses L 16  and L 17 , and a meniscus lens L 18  with its convex surface facing toward the reticle R side. The lens surface of the lens L 16  on the wafer W side is an aspherical surface. 
     The fifth lens group G 5  is comprised of a positive meniscus lens L 19  with its convex surface facing toward the wafer W side, four double convex lenses L 20 , L 21 , L 22  and L 23 , two positive meniscus lenses L 24  and L 25  with their convex surfaces facing toward the reticle R side, a double concave lens L 26 , and two positive meniscus lenses L 27  and L 28  with their convex surfaces toward the reticle R side. Thus, the lenses L 19  to L 25  are consecutive seven positive lenses. In addition, the aperture stop AS is disposed between the lens L 21  and the lens L 22  inside the fifth lens group G 5 . 
     In the present embodiment, a gap between the lens L 18  and the lens L 19  serves as the first air lens LA, and a gap between the lens L 25  and the lens L 26  as the second air lens LB. 
     The first lens group G 1  in the second embodiment is comprised of a double concave lens L 1  and three double convex lenses L 2 , L 3  and L 4 . 
     The second lens group G 2  is comprised of a meniscus lens L 5  with its convex surface toward the reticle R side, two double concave lenses L 6  and L 7 , and a meniscus lens L 8  with its convex surface toward the wafer W side. 
     The third lens group G 3  is comprised of two meniscus lenses L 9  and L 10  with their convex surfaces facing toward the wafer W side, two double convex lenses L 11  and L 12 , and two positive meniscus lenses L 13  and L 14  with their convex surfaces facing toward the reticle R side. 
     The fourth lens group G 4  is comprised of two meniscus lenses L 15  and L 16  with their convex surfaces facing toward the reticle R side, a double concave lens L 17 , a meniscus lens L 18  with its convex surface facing toward the wafer W side, and a double concave lens L 19 . The lens surface of the lens L 17  on the wafer W side is an aspherical surface. 
     The fifth lens group G 5  is comprised of a double convex lens L 20 , a positive meniscus lens L 21  with its convex surface facing toward the wafer W side, four double convex lenses L 22 , L 23 , L 24  and L 25 , a positive meniscus lenses L 26  with its convex surfaces facing toward the reticle R side, a double concave lens L 27 , and two positive meniscus lenses L 28  and L 29  with their convex surfaces facing toward the reticle R side. Thus, the lenses L 20  to L 26  are consecutive seven positive lenses. In addition, the aperture stop AS is disposed between the lens L 21  and the lens L 22  inside the fifth lens group G 5 . 
     In the present embodiment, a gap between the lens L 19  and the lens L 20  serves as the first air lens LA, and a gap between the lens L 26  and the lens L 27  as the second air lens LB. 
     Specifications of the first and second embodiments will be shown in the following Table 1 and Table 2. In the “lens specifications” in the two tables, “No” in the first column shows the numbers of the respective lens surfaces from the reticle R side, “r” in the second column shows the radius of curvature of each lens surface, “d” in the third column shows a gap between each lens surface and the next lens surface, and the fourth column shows the number of each lens and the number of the lens group. 
     The lens surface with the symbol * affixed thereto in the first column is an aspherical surface, while “r” in the second column related to an aspherical lens surface indicates an apex radius of curvature. 
     The shape of the aspherical surface is expressed as follows: 
       Z ( y )=( y   2   /r )/{1−(1+κ( y/r ) 2 ) 1/2   }+A·y   4   +B·y   6   +C·y   8   +D·y   10   
     where 
     y: the height from the optical axis; 
     z: the distance from a tangent plane to the aspherical surface in the direction of the optical axis; 
     r: an apex radius of curvature; 
     κ: a conical coefficient; and 
     A, B, C and D: the coefficients of aspherical surfaces. 
     In [Aspherical Data], the conical coefficient κ, and the coefficients A, B, C and D of the aspherical surfaces are shown. 
     Glass material for all of the lenses in the first and second embodiments is synthetic quartz, and the index of refraction of this synthetic quartz is n=1.50839. The designed wavelength λ of the lens is λ=248.4 nm. 
     In the following Table 3, parameters for the conditions (1) to (10) with respect to the first and second embodiments are shown. 
     
       
         
               
             
               
               
               
               
               
             
               
             
               
               
               
               
             
           
               
                 TABLE 1 
               
               
                   
               
             
             
               
                 [Lens Specifications] 
               
             
          
           
               
                 No 
                 r 
                 d 
                   
                   
               
               
                   
               
               
                  0 
                 ∞ 
                 53.511517 
                 R 
               
               
                  1 
                 424.57965 
                 14.000000 
                 L1  
                 G1 
               
               
                  2 
                 276.57711 
                 3.070692 
               
               
                  3 
                 376.88702 
                 22.426998 
                 L2  
                 G1 
               
               
                  4 
                 −388.71851 
                 0.501110 
               
               
                  5 
                 295.50751 
                 27.657694 
                 L3  
                 G1 
               
               
                  6 
                 −254.24538 
                 0.500000 
               
               
                  7 
                 358.54914 
                 14.000000 
                 L4  
                 G2 
               
               
                 *8 
                 195.82711 
                 12.647245 
               
               
                  9 
                 −639.41262 
                 13.000000 
                 L5  
                 G2 
               
               
                 10 
                 150.39696 
                 24.664558 
               
               
                 11 
                 −144.69206 
                 13.500000 
                 L6  
                 G2 
               
               
                 12 
                 322.10513 
                 28.955373 
               
               
                 13 
                 −109.83313 
                 16.000000 
                 L7  
                 G2 
               
               
                 14 
                 −207.92900 
                 15.959652 
               
               
                 15 
                 −160.80348 
                 26.000000 
                 L8  
                 G3 
               
               
                 16 
                 −141.44401 
                 5.067636 
               
               
                 17 
                 −1685.98156 
                 41.213135 
                 L9  
                 G3 
               
               
                 18 
                 −211.20833 
                 0.774762 
               
               
                 19 
                 2440.61849 
                 33.000000 
                 L10 
                 G3 
               
               
                 20 
                 −448.06815 
                 0.500000 
               
               
                 21 
                 564.27683 
                 33.000000 
                 L11 
                 G3 
               
               
                 22 
                 5923.72721 
                 0.500000 
               
               
                 23 
                 243.35532 
                 44.114198 
                 L12 
                 G3 
               
               
                 24 
                 −21708.35359 
                 3.000000 
               
               
                 25 
                 153.14351 
                 40.732633 
                 L13 
                 G3 
               
               
                 26 
                 319.85990 
                 3.000000 
               
               
                 27 
                 339.65899 
                 19.000000 
                 L14 
                 G4 
               
               
                 28 
                 157.46424 
                 18.907281 
               
               
                 29 
                 743.92557 
                 16.000000 
                 L15 
                 G4 
               
               
                 30 
                 112.50731 
                 38.722843 
               
               
                 31 
                 −161.32909 
                 14.000000 
                 L16 
                 G4 
               
               
                 *32  
                 281.95994 
                 26.642118 
               
               
                 33 
                 −160.27838 
                 17.000000 
                 L17 
                 G4 
               
               
                 34 
                 449.56755 
                 10.306295 
               
               
                 35 
                 1951.49846 
                 19.000000 
                 L18 
                 G4 
               
               
                 36 
                 877.78564 
                 6.606143 
                 LA  
               
               
                 37 
                 −9151.87550 
                 29.645235 
                 L19 
                 G5 
               
               
                 38 
                 −299.45605 
                 0.532018 
               
               
                 39 
                 3339.76762 
                 35.747859 
                 L20 
                 G5 
               
               
                 40 
                 −299.74075 
                 0.646375 
               
               
                 41 
                 822.44376 
                 33.000000 
                 L21 
                 G5 
               
               
                 42 
                 −550.76603 
                 2.970732 
               
               
                 43 
                 — 
                 16.774949 
                 AS  
               
               
                 44 
                 562.40254 
                 31.717853 
                 L22 
                 G5 
               
               
                 45 
                 −1626.95189 
                 71.859285 
               
               
                 46 
                 481.08843 
                 33.425832 
                 L23 
                 G5 
               
               
                 47 
                 −1672.85856 
                 0.500000 
               
               
                 48 
                 188.39765 
                 49.237219 
                 L24 
                 G5 
               
               
                 49 
                 3293.78061 
                 0.500000 
               
               
                 50 
                 158.00533 
                 35.070956 
                 L25 
                 G5 
               
               
                 51 
                 502.57007 
                 11.179008 
                 LB  
               
               
                 52 
                 −1621.68742 
                 18.000000 
                 L26 
                 G5 
               
               
                 53 
                 226.39742 
                 2.757724 
               
               
                 54 
                 122.08486 
                 43.603688 
                 L27 
                 G5 
               
               
                 55 
                 278.54937 
                 2.018765 
               
               
                 56 
                 350.99846 
                 39.566779 
                 L28 
                 G5 
               
               
                 57 
                 5458.39044 
                 12.000001 
               
               
                 58 
                 ∞ 
                   
                 W 
               
               
                   
               
             
          
           
               
                 [Aspherical Data] 
               
               
                   
               
             
          
           
               
                 No = 8  
                 κ = 0.0 
                 A = −0.528194 × 10 −7   
                 B = −0.194253 × 10 −11   
               
               
                   
                   
                 C = −0.335061 × 10 −16   
                 D = 0.130681 × 10 −20   
               
               
                 No = 32 
                 κ = 0.0 
                 A = 0.283261 × 10 −7   
                 B = −0.283101 × 10 −11   
               
               
                   
                   
                 C = −0.334419 × 10 −16   
                 D = 0.469334 × 10 −20   
               
               
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
               
               
               
             
               
             
               
               
               
               
             
           
               
                 TABLE 2 
               
               
                   
               
             
             
               
                 [Lens Specifications] 
               
             
          
           
               
                 No 
                 r 
                 d 
                   
                   
               
               
                   
               
               
                  0 
                 ∞ 
                 44.999990 
                 R 
               
               
                  1 
                 −1076.07977 
                 13.393500 
                 L1  
                 G1 
               
               
                  2 
                 191.74628 
                 2.678700 
               
               
                  3 
                 203.83543 
                 30.358600 
                 L2  
                 G1 
               
               
                  4 
                 −281.63049 
                 0.100000 
               
               
                  5 
                 698.39441 
                 22.322500 
                 L3  
                 G1 
               
               
                  6 
                 −386.51872 
                 12.858341 
               
               
                  7 
                 474.23427 
                 25.269070 
                 L4  
                 G1 
               
               
                  8 
                 −243.56953 
                 0.100000 
               
               
                  9 
                 555.35420 
                 13.393500 
                 L5  
                 G2 
               
               
                 10 
                 158.39107 
                 12.669423 
               
               
                 11 
                 −1459.40394 
                 13.393500 
                 L6  
                 G2 
               
               
                 12 
                 239.04446 
                 20.315320 
               
               
                 13 
                 −131.22470 
                 13.393500 
                 L7  
                 G2 
               
               
                 14 
                 546.91788 
                 15.099178 
               
               
                 15 
                 −176.15961 
                 13.393500 
                 L8  
                 G2 
               
               
                 16 
                 −7754.62824 
                 18.664763 
               
               
                 17 
                 −153.15107 
                 56.461730 
                 L9  
                 G3 
               
               
                 18 
                 −214.76152 
                 0.089290 
               
               
                 19 
                 −814.31313 
                 43.261435 
                 L10 
                 G3 
               
               
                 20 
                 −183.40367 
                 0.089290 
               
               
                 21 
                 1470.53178 
                 38.708260 
                 L11 
                 G3 
               
               
                 22 
                 −358.57233 
                 0.089290 
               
               
                 23 
                 643.08414 
                 28.890312 
                 L12 
                 G3 
               
               
                 24 
                 −2416.29189 
                 0.089290 
               
               
                 25 
                 237.16282 
                 41.777183 
                 L13 
                 G3 
               
               
                 26 
                 4606.42948 
                 0.089290 
               
               
                 27 
                 133.95397 
                 28.708461 
                 L14 
                 G3 
               
               
                 28 
                 177.35032 
                 7.202218 
               
               
                 29 
                 237.42959 
                 13.393500 
                 L15 
                 G4 
               
               
                 30 
                 158.02115 
                 16.613035 
               
               
                 31 
                 521.11453 
                 13.393500 
                 L16 
                 G4 
               
               
                 32 
                 113.10059 
                 41.189093 
               
               
                 33 
                 −157.49963 
                 13.393500 
                 L17 
                 G4 
               
               
                 *34  
                 269.77049 
                 23.416874 
               
               
                 35 
                 −205.56228 
                 13.393500 
                 L18 
                 G4 
               
               
                 36 
                 −244.89882 
                 5.826132 
               
               
                 37 
                 −170.42662 
                 13.393500 
                 L19 
                 G4 
               
               
                 38 
                 483.35645 
                 6.476227 
                 LA  
               
               
                 39 
                 2151.04236 
                 23.455914 
                 L20 
                 G5 
               
               
                 40 
                 −779.82637 
                 0.100000 
               
               
                 41 
                 −1578.31666 
                 31.115587 
                 L21 
                 G5 
               
               
                 42 
                 −238.39783 
                 8.929000 
               
               
                 43 
                 — 
                 7.821200 
                 AS  
               
               
                 44 
                 25030.38813 
                 31.251500 
                 L22 
                 G5 
               
               
                 45 
                 −317.90570 
                 0.100000 
               
               
                 46 
                 422.49997 
                 49.109500 
                 L23 
                 G5 
               
               
                 47 
                 −818.65105 
                 59.359471 
               
               
                 48 
                 3033.59836 
                 40.180500 
                 L24 
                 G5 
               
               
                 49 
                 −813.42694 
                 0.089290 
               
               
                 50 
                 239.06328 
                 44.645000 
                 L25 
                 G5 
               
               
                 51 
                 −11506.10547 
                 0.089290 
               
               
                 52 
                 181.73186 
                 40.297673 
                 L26 
                 G5 
               
               
                 53 
                 1121.02103 
                 8.827244 
                 LB  
               
               
                 54 
                 −1156.72532 
                 17.858000 
                 L27 
                 G5 
               
               
                 55 
                 438.30163 
                 0.100000 
               
               
                 56 
                 128.66827 
                 63.530555 
                 L28 
                 G5 
               
               
                 57 
                 328.26122 
                 2.678700 
               
               
                 58 
                 305.11181 
                 48.192777 
                 L29 
                 G5 
               
               
                 59 
                 739.10052 
                 11.137249 
               
               
                 60 
                 ∞ 
                   
                 W 
               
               
                   
               
             
          
           
               
                 [Aspherical Data] 
               
               
                   
               
             
          
           
               
                 No = 34 
                 κ = 0.0 
                 A = 0.331422 × 10 −7   
                 B = −0.283218 × 10 −11   
               
               
                   
                   
                 C = −0.694259 × 10 −16   
                 D = 0.689446 × 10 −20   
               
               
                   
               
             
          
         
       
     
     
       
         
               
               
               
             
               
               
               
               
             
           
               
                   
                 TABLE 3 
               
               
                   
                   
               
               
                   
                 First Embodiment 
                 Second Embodiment 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                 (1) 
                 D/L 
                 0.225 
                 0.206 
               
               
                 (2) 
                 |PA-PB| × L 
                 0.78 
                 0.43 
               
               
                 (3) 
                 |PA| × L 
                 0.716 
                 1.52 
               
               
                 (4) 
                 |PB| × L 
                 1.43 
                 1.03 
               
               
                 (5) 
                 Y/L 
                 0.0115 
                 0.0113 
               
               
                 (6) 
                 NA 
                 0.75 
                 0.75 
               
               
                 (7) 
                 f2/f4 
                 1.40 
                 1.26 
               
               
                 (8) 
                 f5/L 
                 0.15 
                 0.137 
               
               
                 (9) 
                 f4/L 
                 −0.044 
                 −0.047 
               
               
                 (10) 
                 f2/L 
                 −0.061 
                 −0.060 
               
               
                   
               
             
          
         
       
     
     The spherical aberration, the astigmatism and the distortion in the first embodiment are shown in FIGS. 2A to  2 C, while the lateral aberrations in the same embodiment are shown in FIGS. 3A to  3 E. In the same manner, the respective aberrations in the second embodiment are shown in FIGS. 5A to  5 C and FIGS. 6A to  6 E. In these aberrations views, NA denotes the numerical aperture and Y the image height. In the view of astigmatism, the dotted line indicates a meridional image surface and the solid line a sagittal image surface. 
     As clearly seen from the respective aberration views, each embodiment has excellent image formation performance by adapting the required lens constitution and satisfying the conditions (1) to (10). 
     As described above, according to the present invention, it is possible to correct a fluctuation in field angle owing to a coma aberration to reduce the effective diameter of the lens since there are provided surfaces to act against the light flux in font and the rear of the aperture stop. 
     It is possible to attain an excellent image formation performance with a high NA on a wide image surface in a compact apparatus, by thus suppressing generation of aberrations. That is, it is possible to obtain a projection optical system for exposure satisfying both of high resolving power and a wide exposure area.