摘要:
An alignment apparatus by which two points on a first standard line on a first workpiece may be aligned in two regions having as the centers two standard points on a second standard line on a second workpiece optically opposed to the first workpiece and having predetermined areas. The two regions are diamond-shaped. By this, it is possible to reduce the alignment error of the first and second workpieces.
摘要:
An alignment apparatus for mask and wafer each having alignment marks provided in a narrow strip like area between circuit patterns is disclosed, which mask and wafer are used in manufacturing semiconductor circuit elements. In the apparatus, the mask and wafer are scanned to obtain scan signals by means of which the amount of relative deviation between the alignment marks on mask and wafer is detected. By means of the detected signal, an alignment is effected between the mask and wafer in the apparatus. For this type of alignment apparatus, there is a problem that since the alignment marks are provided in the narrow strip like area, no coincidence between the scanning position and the strip area is attainable with pre-alignment accuracy. Improvement in the alignment apparatus according to the invention lies in that a reading of alignment marks is initiated after the coincidence is photoelectrically detected.
摘要:
An alignment device of a type, wherein an alignment pattern provided on a mask for fabrication of a semiconductor circuit element and an alignment pattern provided on a wafer are photoelectrically read in a dark field by a flying spot scanning system or a flying image scanning system to detect a relative positional relationship between the mask and the wafer, and a desired positional relationship is obtained by moving at least one of the mask and wafer on the basis of a detected signal. The novel feature of this alignment device resides in that the size of a line forming the alignment pattern along the scanning line is twice or more as large as the size of the scanning spot.
摘要:
In the apparatus, an image of a mask is printed on a light-sensitive layer while minimizing the debasing influences due to the diffraction occurring on the layer surface as well as due to the standing wave occurring in the layer. This apparatus includes an arrangement such that the rays coming from a light source are collimated and then directed to a fly's eye lens assembly, and the exit rays from this assembly are again collimated to illuminate the mask. The luminous fluxes of parallel rays impinging upon the mask at various angles of incidence remove the influences of diffraction on the image of the mask. Also this apparatus includes a filter removably inserted in the optical path between the light source and the assembly to remove the influence of the standing wave.
摘要:
An exposure apparatus includes an illumination optical system for illuminating the reticle using the ultraviolet light from the light source, and a polarization measuring unit measuring the polarization state of the ultraviolet light, the polarization measuring unit including an optical unit for providing at least three different phase differences to the ultraviolet light that has passed at least part of the illumination optical system, a polarization element for providing a different transmittance in accordance with a polarization state of the ultraviolet light that has passed the optical unit, and an image pickup device for detecting a light intensity of the ultraviolet light that has passed the polarization element, the polarization measuring unit measuring the polarization state of the ultraviolet light that has passed the at least part of the illumination optical system based on a detection result of the image pickup device.
摘要:
An exposure apparatus that exposes a pattern of an original onto a substrate includes a condenser optical system configured to split light from a light source into plural rays, to condense the plural rays at different positions on the original, and to make a central part of each of the plural rays that illuminate the original darker than a periphery at the Fourier transform plane with respect to the original, and a projection optical system configured to project the pattern of the original onto the substrate.
摘要:
An illumination optical system for illuminating an illuminated surface using light from a light source includes a first diffraction optical element upon which the light from the light source is incident, and a second diffraction optical element upon which the light from the light source is incident, wherein the light from the first diffraction optical element forms a first part of an illumination distribution on a predetermined surface that substantially has a Fourier transform relationship with the illuminated surface, and the light from the second diffraction optical element forms a second part of the illumination distribution.
摘要:
The present invention relates to a plate type heat exchanger having a heat exchange element composed of two plates for exchanging heat between a fluid flowing inside the heat exchange element and a fluid flowing outside the heat exchange element. In the plate type heat exchanger, the two plates (1) have a plurality of depressions (8), and the depressions are brought into contact with and bonded to each other. Peripheral portions of the plates are sealed to form a space in which a fluid flows and constitute a heat exchange element (2) having opening portions (5, 6) at both ends thereof. The heat exchange elements (2) are piled on and bonded to each other so that the opening portions (5, 6) communicate with each other.
摘要:
An exposure method for transferring a device pattern to a resist, wherein the device pattern includes a first element and a second element having a linewidth narrower than the first element. The method includes a first exposure step for exposing the resist by use of an interference fringe, produced by interference of two light beams, through an exposure amount substantially not greater than a threshold of the resist, and a second exposure step for exposing the resist with a light pattern related to the first and second elements. A light component, of the light pattern, related to the first element bears an exposure amount greater than the threshold, a light component, of the light pattern, related to the second element bears an exposure amount not greater than the threshold and is to be combined with light in a portion of the interference fringe, and a sum of the exposure amount of the light component related to the second element and an exposure amount provided by the light in the portion of the interference fringe is greater than the threshold.
摘要:
An illumination optical system for use in an exposure apparatus for projecting a pattern of a mask onto a substrate. The illumination system includes a first beam shape changing optical system for transforming a light, supplied from a light source, into a slit-like light of an oblong shape, and a second beam shape changing optical system for transforming the slit-like light of oblong shape into a slit-like light of an arcuate shape, the second beam shape changing optical system having a prism element. The mask is illuminated with the slit-like light of arcuate shape.