Stage for substrate
A stage is provided on which is mounted a substrate that has a concavo-convex portion such as a circuit formed on the underside thereof. A channel 3 through which a coolant such as water flows is formed in a stage 1 . An annular flange portion 4 is formed on the top surface of the stage 1 . The inner side of the flange portion 4 forms a concave portion 5 . The top surface of the flange portion 4 is provided with a smooth finish in order to mount a peripheral section of the underside of a substrate W thereon. Holes through which are passed three positioning pins 6 and lift pins 7 are provided in the flange portion 4 at regular intervals in the circumferential direction.
1. A stage for a substrate that is a stage which mounts thereon a substrate that has a concavo-convex portion formed on an underside thereof, wherein:
the stage is provided with a flange portion for supporting a peripheral section of a substrate which does not have a circuit formed on the peripheral section, the flange portion having a plurality of through holes formed therein;
the stage also includes a concave portion that forms a gap with the underside of the substrate, the concave portion provided on the stage inside of the flange portion;
a plurality of substrate positioning pins are formed on and extend upwardly from a top surface of the flange portion at a first radial distance from a center of the stage; and
a plurality of lift pins for transferring a substrate pass through the through holes of the flange portion, the lift pins being separate from the substrate positioning pins and disposed at a second radial distance from the center of the stage, said second radial distance being less than said first radial distance;
wherein said plurality of substrate positioning pins and said plurality of lift pins contact only an end portion of the substrate; and wherein said plurality of substrate positioning pins and said plurality of lift pins do not contact a portion of the substrate having the circuit formed thereon.
2. The stage for a substrate according to claim 1 , further comprising a substrate, wherein the concavo-convex portion of the substrate comprises an electric circuit.
3. The stage for a substrate according to claim 1 , wherein a shape of a bottom surface of the concave portion of the stage is formed with a curved shape in which a central part is a deepest part and an outer circumferential section is a shallowest part.
4. The stage for a substrate according to claim 1 , wherein a number of the positioning pins and the lift pins is three or more, respectively, and the positioning pins and the lift pins are arranged at regular intervals in a circumferential direction, respectively.
5. The stage for a substrate according to claim 1 , wherein each of the positioning pins comprises a tapered upper portion formed in a substantially frustoconical shape.
6. The stage for a substrate according to claim 1 , further comprising an electrostatic attraction electrode disposed below the concave portion of said stage.
7. The stage for a substrate according to claim 1 , further comprising a hand for delivering the substrate to the stage, the hand comprising a base having a raised mounting portion thereon, and two fingers which extend substantially parallel to each other from the base, wherein a distal end portion of each finger comprises a raised mounting portion.
8. A stage for a substrate comprising a stage member which mounts thereon a substrate that has a concavo-convex portion formed on an underside thereof, wherein:
the stage member is provided with a flange portion for supporting a peripheral section of a substrate which does not have a circuit formed on the peripheral section, the flange portion having a plurality of through holes formed therein;
the stage member having a concave portion that forms a gap with the underside of the substrate, the concave portion being provided on the stage member inside of the flange portion;
a plurality of substrate positioning pins are formed on and extend upwardly from a top surface of the flange portion at a first radial distance from a center of the stage member, wherein each of the positioning pins comprises a tapered upper portion formed in a substantially frustoconical shape; and
a plurality of lift pins for transferring a substrate pass through the through holes of the flange portion, the lift pins being separate from the substrate positioning pins and disposed at a second radial distance from the center of the stage, said second radial distance being less than said first radial distance.
9. The stage for a substrate according to claim 8 , further comprising an electrostatic attraction electrode disposed below the concave portion of said stage member.
10. The stage for a substrate according to claim 8 , further comprising a hand for delivering the substrate to the stage member, the hand comprising a base having a raised mounting portion thereon, and two fingers which extend substantially parallel to each other from the base, wherein a distal end portion of each finger comprises a raised mounting portion of the finger.