1. A device for handling a wafer comprising:
an interior accessible through a plurality of entrances; and
a plurality of sensors consisting of two sensors for each one of the plurality of entrances, each sensor capable of detecting a presence of a wafer at a predetermined location within the interior, wherein the plurality of sensors are arranged so that at least two of the plurality of sensors detect the wafer for any position of the wafer entirely within the interior.
2. The device of claim 1 wherein the plurality of entrances includes four entrances.
3. The device of claim 1 wherein the plurality of entrances includes seven entrances.
4. The device of claim 1 wherein the plurality of entrances includes eight entrances.
5. The device of claim 1 wherein the plurality of sensors includes optical sensors.
6. The device of claim 5 wherein the plurality of sensors includes at least one light emitting diode.
7. The device of claim 1 further comprising a robotic arm having a center axis within the interior, the robotic arm including an end effector for handling wafers.
8. A device for handling a wafer comprising:
an interior accessible through a plurality of entrances; and
a plurality of sensors consisting of two sensors for each one of the plurality of entrances, each sensor capable of detecting a presence of a wafer at a predetermined location within the interior, wherein the plurality of sensors are arranged so that a first pair of sensors detect a wafer entering linearly through each one of the plurality of entrances and a second pair of sensors are positioned substantially immediately outside the maximum diameter of the wafer entering linearly through each one of the plurality of entrances, and wherein each one of the plurality of entrances shares one of the first pair of sensors and the second pair of sensors with each neighboring one of the plurality of entrances.
9. The device of claim 8 wherein the plurality of entrances includes four entrances.
10. The device of claim 8 wherein the plurality of entrances includes seven entrances.
11. The device of claim 8 wherein the plurality of entrances includes eight entrances.
12. The device of claim 8 wherein the plurality of sensors includes optical sensors.
13. The device of claim 12 wherein the plurality of sensors includes at least one light emitting diode.
14. The device of claim 8 further comprising a robotic arm having a center axis within the interior, the robotic arm including an end effector for handling wafers.
15. A device for handling a wafer comprising:
an interior accessible through four entrances; and
eight sensors, each capable of detecting a presence of a wafer at a predetermined location within the interior, the sensors arranged into two square arrays centered about a center of the interior, sized such that a first one of the square arrays is smaller than a second one of the square arrays and oriented so that a group of four of the sensors at opposing vertices of the two square arrays are collinear.
16. The device of claim 15 wherein the eight sensors include optical sensors.
17. The device of claim 16 wherein the eight sensors include at least one light emitting diode.
18. The device of claim 15 further comprising a robotic arm having a center axis within the interior, the robotic arm including an end effector for handling wafers.
19. The device of claim 15 wherein at least one of the four entrances is coupled to a process module.
20. The device of claim 15 wherein at least one of the four entrances is coupled to a load lock.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A mounting retaining a picture, which picture comprises a web of hard copy material upon which an image is recorded, the mounting having:
a web having a display panel which has a display surface on its front face, the display panel having a perimeter defined by a frame having a plurality of spars;
each spar being made of leaves created from the web and extending from the perimeter of the display panel, each of the leaves being folded at least twice, in a rearward direction to create a spar having a polygonal cross-section;
each spar having an attachment region located on a surface of one of the leaves and to which the picture is attached to the respective spar;
the spars being mutually interlocking behind the front surface of the display panel thereby to create the frame and to tension the picture
2. A picture mounting according to claim 1 wherein the attachment regions are provided by adhesive regions which enable adhesive attachment of the picture to the respective leaf.
3. A picture mounting according to claim 2 wherein the adhesive regions are strips of adhesive extending substantially parallel to the perimeter of the display panel
4. A picture mounting according to claim 1 wherein the polygonal cross section of each spar is a quadrilateral.
5. A picture mounting according to claim 1 wherein the leaves include mutually engagable elements which, upon folding in the rearward direction, create mutual interlocking of the spars.
6. A picture mounting according to claim 5 wherein the mutually engageable elements provide a cam action to draw at least two of the spars into location against a rearward facing surface of the display panel.
7. A picture mounting according to claim 1 wherein the display panel is rectangular.
8. A picture mounting according to claim 1 wherein each of the leaves has a pair of locating surfaces to enable alignment of the picture prior to attachment of the picture to the leaves.
9. A picture mounting according to claim 1 wherein rearward folding of the leaves subsequent to adhesion of the picture to the leaves causes tensioning of the picture thereby to retain the picture flat and taught against the display panel.
10. A picture mounting according to claim 1 comprising staples for the attachment of the picture to the attachment region of the spars.
11. A picture mounting according to claim 1 wherein each leaf has first sub-leaf defined by a first fold which extends between the leaf and the display panel and a second sub-leaf defined by a second fold which extends between the first sub-leaf and the second sub-leaf, and the attachment regions are located on the second sub-leaf.
12. A method of mounting a picture upon a display surface, wherein the display surface is provided by a web from which a plurality of leaves extend, the method comprising the steps of:
aligning the picture and the leaves by bringing alignment surfaces on the leaves into register with adjacent edges of the picture;
with the picture and leaves in mutual alignment, attaching the picture to the leaves;
subsequent to attachment of the picture to the leaves, folding the leaves rearwardly of the display surface, to create spars having a polygonal cross section; and
mutually interlocking the spars.
13. A method according to claim 12 wherein the step of attaching the picture to the leaves comprises the step of removing release paper from self-adhesive strips located on the leaves and folding the picture into contact with consequently exposed adhesive strips located on the leaves.
14. A method according to claim 12 wherein the step of attaching the picture to the leaves comprises the step of stapling the picture to the leaves.
15. A method according to claim 12 wherein each leaf has first sub-leaf defined by a first fold which extends between the leaf and the display panel and a second sub-leaf defined by a second fold which extends between the first sub-leaf and the second sub-leaf, and the picture is attached to the leaves on the second sub-leaves.
16. A method according to claim 12 wherein the step of interlocking the spars occurs during the step of rearwardly folding the leaves to create the spars.