1. A coreless motor comprising:
a ring-shaped coil yoke fitted to the interior of a casing, which has a conductive coil connected to a ring-shaped magnet, hose external circumference face opposes the internal circumference face of the coil yoke, and the coil designed to revolve jointly with the rotating axis following power input to the said coil;
wherein the said coil confronts the upper and lower faces of the magnet and consists of a flat portion whose plane part takes an arc form and of a curved-and-folded portion composed of a winding unit confronting the external circumference side face of the magnet, while the section from one end of the lead wire composing these winding units to its other end constitutes a continuous hollow unit;
wherein a thin-sheet-shaped flange is installed on the lower part of the coil holder fixed to the periphery of the said rotating axis and a plurality of said coils are attached so as to be arranged in line with the circumference direction of the magnet by fixing the flat portion on the lower side of each coil to the flange; and
wherein thin annulus-shaped upper-side reinforcing plates are attached to the flat portion on the upper side of each coil.
2. The coreless motor stated in claim 1, which is constituted by attaching a thin ring-shaped lower-side reinforcing plate to the further below part of the flat portion of the coil, which is fixed to the lower face of the said coil holder flange.
3. The coreless rotor stated in claim 2, whose lower-side reinforcing plate mentioned above is installed in a space up to the coil holder flange so as to be in parallel with the flange by means of a spacer, whose length is almost equal to the thickness of the lower-side flat portion of the coil, while the flat lower-side portion of the oil is put into, and fixed to, the gap formed by the spacer between the flange and the lower-side reinforcing plate.
4. The coreless motor stated in claim 1, wherein the upper-side reinforcing plate consists of conductive materials, with one end of each coil linked to the upper-side reinforcing plate, and the other end of the coil connected to the commutators installed around the rotating axis in the lower portion of the coil holder.
5. A coreless motor comprising:
a ring-shaped coil yoke fitted to the interior of a casing, which has a conductive coil connected to a ring-shaped magnet, whose external circumference face stands opposed to the internal circumference ace of the coil yoke, and the coil designed to revolve jointly with the rotating axis following power input to the said coil;
wherein the said coil confronts the upper and lower faces of the magnet and consists of a flat portion whose plane part takes an arc form and of a curved-and-folded portion composed of a winding unit confronting the external circumference side face of the magnet, while the section from one end of the lead wire composing these winding units to its other end constitutes a continuous hollow unit;
wherein the said magnet comprises four poles arranged in the radial direction and three of said coils are installed around the rotating axis; and
wherein a six-segment commutator is fixed around the rotating axis, with two brushes set in positions each forming an angle of 90\xb0 in relation to the commutator.
6. A coreless motor comprising:
a ring-shaped coil yoke fitted to the interior of a casing, which has a conductive coil connected to a ring-shaped magnet, whose external circumference face stands opposed to the internal circumference face of the coil yoke, and the coil designed to revolve jointly with the rotating is following power input to the said coil;
wherein the said coil confronts the upper and lower faces of the magnet and consists of a flat portion whose plane part takes an arc form and of a curved-and-folded portion composed of a winding unit confronting the external circumference side face of the magnet, while the section from one end of the lead wire composing these winding units to its other end constitutes a continuous hollow unit;
wherein the said magnet comprises two poles arranged in the circumferential direction and three of said coils are installed around the rotating axis; and
wherein three-segment commutator is fixed around the rotating axis, with two brushes set in positions parallel with each other in relation to the commutator.
7. A coreless motor as recited in claim 1, wherein the aforementioned magnet is fixed to the external circumference of the ring-shaped magnet holder which is equipped with a cylinder unit, designed to hold a bearing in its upper part with this cylinder unit engaged with, and fitted to, a boss formed in the center of the top panel of the casing, while the said rotating axis is held by a bearing installed within the said cylinder unit.
8. The coreless motor stated in claim 7, whose magnet holder mentioned above has a dented portion on its lower side, with the upper portion of the coil holder composed so as to touch this dented portion of the magnet holder.
9. A coreless motor as recited in claim 1, wherein the internal surface of the coil yoke is shaped to correspond with the external circumference side face and upper and lower faces of the said coil, and the coil yoke is formed by bonding together the upper half portion of the coil yoke that contains the upper half of the coil and its lower half portion that contains the lower half of the coil.
10. A coreless motor as recited in claim 1. wherein the said magnet is composed by arranging 4 arc-shaped magnets, individually magnetized in the radial direction, in a ring form.
11. A coreless motor as recited in claim 5, wherein the said magnet is fixed to the external circumference of the ring-shaped magnet holder, which is equipped with a cylinder unit designed to hold a bearing in its upper part, said cylinder unit engaged with, and fitted to, a boss formed in the center of the top panel of the casing, while the said rotating axis is held by a bearing installed within the said cylinder unit.
12. A coreless motor as recited in claim 6, wherein the said magnet is fixed to the external circumference of the ring-shaped magnet holder, which is equipped with a cylinder unit designed to hold a bearing in its upper part, said cylinder unit engaged with, and fitted to, a boss formed in the center of the top panel of the casing, while the said rotating axis is held by a bearing installed within the said cylinder unit.
13. A careless motor as recited in claim 5, wherein the internal surface of the coil yoke is shaped to correspond with the external circumference side face and upper and lower faces of the said coil, and the coil yoke is formed by bonding to ether the upper half portion of the coil yoke that contains the upper half of the coil and its lower half portion that contains the lower half of the coil.
14. A coreless motor as recited in claim 6, wherein the internal surface of the coil yoke is shaped to correspond with the external circumference side face and upper and lower faces of the said coil, and the coil yoke is formed by bonding to together the upper half portion of the coil yoke that contains the upper half of the coli and its lower half portion that contains the lower half of the coil.
15. A coreless motor as recited in claim 5, wherein the said magnet is composed by arranging 4 arc-shaped magnets, individually magnetized in the radial direction, in a ring form.
16. A coreless motor as recited in claim 6, wherein the said magnet is composed by arranging 4 arc-shaped magnets, individually magnetized in the radial direction, in a ring form.
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 method of registering a scanning grid of a scanner with a printing grid of a printer, comprising:
placing a predetermined motif in a digital image to create a modified image;
printing the modified image using said printer to create a printed modified image;
scanning the printed modified image using said scanner to create a scanned modified image, said scanned modified image including said motif;
using the motif included in said scanned modified image to determine a rotation \u03b1 of said scanning grid of said scanner with respect to said printing grid of said printer; and
using the motif included in said scanned modified image to determine a translation vector, said translation vector giving a position of a node of said printing grid in a coordinate system of said scanning grid.
2. The method according to claim 1, wherein said motif includes at least one elongated line.
3. The method according to claim 2, wherein said at least one elongated line at least partially covers a first row of pixels and a second row of pixels of said scanning grid when said scanned modified image is created, and wherein said step of using the motif included in said scanned modified image to determine a rotation \u03b1 comprises:
generating a first greyness curve for said first row and a second greyness curve for said second row;
measuring a directional distance D, said directional distance D being equal to the number of pixels between a first pixel in said first row having a pre-selected greyness value from said first greyness curve and a second pixel in said second row having said pre-selected greyness value from said second greyness curve;
calculating an angle according to the following formula: \u03c02\u2212arctan(Dd), wherein d is the number of pixels separating said first row and said second row; and
determining said rotation \u03b1 based on said angle.
4. The method according to claim 3, wherein said rotation \u03b1 is determined to be equal to said angle.
5. The method according to claim 3, wherein said step of determining said rotation \u03b1 based on said angle comprises calculating an average of said angle and one or more additional angles, each of said one or more additional angles being determined using a respective additional elongated line included in said motif and using respective additional steps similar to said generating, measuring and calculating steps.
6. The method according to claim 1, wherein said motif includes at least one elongated line, a first series of substantially parallel first line segments and a second series of substantially parallel second line segments, said first line segments being substantially perpendicular to said second line segments.
7. The method according to claim 6, wherein said step of using the motif included in said scanned modified image to determine a rotation \u03b1 uses said at least one elongated line and wherein said step of using the motif included in said scanned modified image to determine a translation vector uses said first line segments and said second line segments.
8. The method according to claim 1, wherein said motif includes a first series of substantially parallel first line segments and a second series of substantially parallel second line segments, said first line segments being substantially perpendicular to said second line segments.
9. The method according to claim 8, wherein said scanning grid and said printing grid are not aligned with one another, wherein said first line segments partially cover a plurality of rows of first pixels of said scanning grid when said scanned modified image is created, and wherein said second line segments partially cover a plurality of columns of second pixels of said scanning grid when said scanned modified image is created, said first pixels being different from said second pixels, and wherein said step of using the motif included in said scanned modified image to determine a translation vector comprises:
(a) for each of a plurality of selected ones of said partially covered rows:
plotting a grey level of each of the first pixels in the selected one of said partially covered rows;
fitting a first curve to said plotted grey levels of each of the first pixels;
plotting a first ideal grey level curve for said selected one of said partially covered rows that represents a plurality of grey levels that would have resulted had said scanning grid and said printing grid been aligned with one another; and
measuring a first offset between said first curve and said first ideal grey level curve;
(b) plotting each said first offset measured in step (a) and obtaining a first offset function therefrom;
(c) for each of a plurality of selected ones of said partially covered columns:
plotting a grey level of each of the second pixels in the selected one of said partially covered columns;
fitting a second curve to said plotted grey levels of each of the second pixels;
plotting a second ideal grey level curve for said selected one of said partially covered columns that represents a plurality of grey levels that would have resulted had said scanning grid and said printing grid been aligned with one another; and
measuring a second offset between said second curve and said second ideal grey level curve;
(d) plotting each said second offset measured in step (c) and obtaining a second offset function therefrom;
wherein said translation vector comprises said first offset function and second offset function.
10. The method according to claim 9, wherein said step of using the motif to determine said rotation \u03b1 comprises determining one or both of a first angle of said first offset function with respect to a first function axis and a second angle of said second offset function with respect to a second function axis and determining said rotation \u03b1 from one or both of said first angle and said second angle.
11. The method according to claim 10, wherein said rotation \u03b1 is determined to be equal to said first angle.
12. The method according to claim 10, wherein said rotation \u03b1 is determined to be equal to said second angle.
13. The method according to claim 10, wherein said rotation \u03b1 is determined to be equal to an average of said first angle and said second angle.