Claims
- 1. A method of fabricating a mold for fabricating optical fiber guide blocks, for the purpose of molding by a press-molding process at least the optical fiber engagement portions of said optical fiber guide blocks, said optical fiber guide blocks comprising said optical fiber engagement portion(s) for the purpose of positioning and aligning optical fibers at a fixed pitch, wherein a grindstone is used comprising two main grinding surfaces that machine formed surfaces that support the sides of said optical fibers; and
- a shape wherein the angle .theta. subtended by the two tangent lines which touch said two main grinding surfaces in a cross-section perpendicular to said main grinding surfaces constitutes an angle that is equal to or smaller than .theta.c which satisfies the relationship noted below; and
- a contour of the tip that connects said two main grinding surfaces is contained within an area bounded by said two tangent lines and by a line that is tangent to an imaginary circle and perpendicular to the straight line connecting the intersection of said two tangent lines with the center of said imaginary circle, and that passes between said intersection and the center of said imaginary circle, when said imaginary circle, of radius Rmin as defined below, is inscribed in the area that is in the bight of said two tangent lines:
- .theta.c=2 tan.sup.-1 {(S.sup.2 -1)/2S}
- where:
- S=YO/RO
- Rmin=[RO+{RO/sin (.theta./2)}-{YO/tan (.theta./2)}]/[1-{1/sin (.theta./2)}];
- RO is the optical fiber radius; and
- YO is half the pitch length of the optical fiber engagement portion; and said method comprises:
- forming concavities extending in a prescribed direction, of such depth that said intersection between said two tangent lines will be at a position deeper than dmin, by a grinding process, on the flat surface of the mold material, at said pitch, in a direction perpendicular to said prescribed direction, in a number that is the number of said optical fiber engagement portions plus 1 wherein
- dmin=[YO-RO.multidot.tan {(.pi.-.theta.)/4}]/tan (.theta./2).
- 2. A method of fabricating a mold for fabricating optical fiber guide blocks, for the purpose of molding by press-molding process at least the optical fiber engagement portions of said optical fiber guide blocks; said optical fiber guide blocks comprising
- groove-shaped optical fiber engagement portion(s) for the purpose of positioning optical fibers; wherein a grindstone is used comprising two main grinding surfaces that machine formed surfaces that support the sides of said optical fibers; and
- a shape wherein the angle .theta. subtended by the two tangent; lines which touch said two main grinding surfaces in a cross-section perpendicular to said main grinding surfaces constitutes an angle that is equal to or smaller than .theta.c which satisfies the relationship noted below; and
- a contour of the tip that connects said two main grinding surfaces is contained within an area bounded by said two tangent lines and by a line that is tangent to an imaginary circle and perpendicular to the straight line connecting the intersection of said two tangent lines with the center of said imaginary circle, and that passes between said intersection and the center of said imaginary circle, when said imaginary circle, of radius Rmin as defined below, is inscribed in the area that is in the bight of said two tangent lines:
- .theta.c=2 tan.sup.-1 {(S.sup.2 -1)/2S}
- where:
- S=YO/RO
- Rmin=[RO+{RO/sin (.theta./2)}-{YO/tan (.theta./2)}]/[1-{1/sin (74 /2)}];
- RO is the optical fiber radius; and
- YO is half the pitch length of the optical fiber engagement portion; and said method comprises the steps of
- forming a plurality of concavities extending in a prescribed direction, of such depth that said intersection between said two tangent lines will be at a position deeper than dmin, by a grinding process, on the flat surface of the mold material, in a direction perpendicular to said prescribed direction, and such that the interval between at least two of said concavities becomes 2YO; wherein
- dmin=[YO-RO.multidot.tan {(.pi.-.theta.)/4}]/tan (.theta./2).
- 3. The method of fabricating a mold for fabricating optical fiber guide blocks, according to claim 1, wherein concavities are machined at a depth such that said intersection between said two tangent lines becomes a position that is shallower than dmax, as defined below:
- dmax=YO/tan (.theta./2).
- 4. The method of fabricating a mold for fabricating optical fiber guide blocks, according to claim 3, comprising: a process for machining such that, after grinding-machining said concavities, outside of the two grooves positioned outermost among said grooves, the portions which connect to the bottoms of at least said two grooves are in the same plane as said bottoms of said two grooves.
- 5. A method of fabricating a mold for fabricating optical fiber guide blocks, for the purpose of molding by press-molding process at least the optical fiber engagement portions of said optical fiber guide blocks, said optical fiber guide blocks comprising said optical fiber engagement portion(s) for the purpose of positioning and aligning optical fibers at a fixed pitch, wherein a grindstone is used comprising two main grinding surfaces that machine formed surfaces that support the sides of said optical fibers; and
- a shape wherein the angle .theta. subtended by the two tangent lines which touch said two main grinding surfaces in a cross-section perpendicular to said main grinding surfaces constitutes an angle that is not greater than .theta.c which satisfies the relationship noted below; and
- a contour of the tip that connects said two main grinding surfaces is contained within an area bounded by said two tangent lines and by a line that is tangent to an imaginary circle and perpendicular to the straight line connecting the intersection of said two tangent lines with the center of the imaginary circle, and that passes between said intersection and the center of said imaginary circle, when said imaginary circle, of radius Rmin as defined below, is inscribed in the area that is in the bight of said two tangent lines:
- .theta.c=2 tan.sup.-1 {S.sup.2 -1)/2S},
- where:
- S=YO/RO
- Rmin=[RO+{RO/sin (.theta./2)}-{YO/tan (.theta./2)}]/[1-{1/sin (.theta./2)}];
- RO is the optical fiber radius; and
- 2YO is the interval between the concavities when at least two groove-shaped concavities are formed by the grindstone in a mold material that is to be the mold, so as to form the optical fiber engagement portion(s) between the concavities; and said method comprises:
- forming concavities extending in a prescribed direction, of such depth that said intersection between said two tangent lines will be at a position deeper than dmin, by a grinding process, on the flat surface of the mold material, at said pitch, in a direction perpendicular to said prescribed direction, in a number that is the number of said optical fiber engagement portions plus 1, wherein
- dmin=[YO-RO.multidot.tan {(.pi.-.theta.)/4}]/tan (.theta./2).
- 6. A method of fabricating a mold for fabricating optical fiber guide blocks, for the purpose of molding by press-molding process at least the optical fiber engagement portions of said optical fiber guide blocks, said optical fiber guide blocks comprising said optical fiber engagement portion(s) for the purpose of positioning and aligning optical fibers at a fixed pitch, wherein a grindstone is used comprising two main grinding surfaces that machine formed surfaces that support the sides of said optical fibers; wherein the angle .theta. subtended by the two tangent lines in a cross-section perpendicular to said main grinding surfaces constitutes an angle that exceeds .theta.c which satisfies the relationship noted below:
- .theta.c=2 tan.sup.-1 {(S2-1)/2S},
- where:
- S=YO/RO;
- RO is the optical fiber radius; and
- YO is half the pitch length of the optical fiber engagement portion; and said method comprises:
- forming concavities extending in a prescribed direction, of such depth that said intersection between said two tangent lines will be at a position deeper than dmin, by a grinding process, on the flat surface of the mold material, at said pitch, in a direction perpendicular to said prescribed direction, in a number that is the number of said optical fiber engagement portions plus 1, wherein
- dmin=[YO-RO.multidot.tan ({(.pi.-.theta.)/4}]/tan (.theta./2).
- 7. A method of fabricating a mold for fabricating optical fiber guide blocks, for the purpose of molding by press-molding process at least the optical fiber engagement portions of said optical fiber guide blocks, said optical fiber guide blocks comprising said optical fiber engagement portion(s) for the purpose of positioning and aligning optical fibers at a fixed pitch, wherein a grindstone is used comprising two main grinding surfaces that machine formed surfaces that support the sides of said optical fibers; wherein the angle .theta. subtended by the two tangent lines in a cross-section perpendicular to said main grinding surfaces constitutes an angle that exceeds .theta.c which satisfies the relationship noted below:
- .theta.c=2 tan.sup.-1 {(S2-1)/2S},
- where:
- S=YO/RO;
- RO is the optical fiber radius; and
- 2YO is the interval between the concavities when at least two groove-shaped concavities are formed by the grindstone in a mold material that is to be the mold, so as to form the optical fiber engagement portion between the concavities; and said method comprises:
- forming concavities extending in a prescribed direction, of such depth that said intersection between said two tangent lines will be at a position deeper than dmin, by a grinding process, on the flat surface of the mold material, at said pitch, in a direction perpendicular to said prescribed direction, in a number that is the number of said optical fiber engagement portions plus 1, wherein
- dmin=[YO-RO.multidot.tan {(.pi.-.theta.)/4}]/tan (.theta./2).
- 8. A method of fabricating a mold for fabricating optical fiber guide blocks, for the purpose of molding by press-molding process at least the optical fiber engagement portions of said optical fiber guide blocks, said optical fiber guide blocks comprising:
- groove-shaped optical fiber engagement portion(s) for the purpose of positioning optical fibers; wherein a grindstone is used comprising two main grinding surfaces that machine formed surfaces that support the sides of said optical fibers; and
- a shape wherein the angle .theta. subtended by the two tangent lines which touch said two main grinding surfaces in a cross-section perpendicular to said main grinding surfaces constitutes an angle that is not greater than .theta.c which satisfies the relationship noted below; and
- a contour of the tip that connects said two main grinding surfaces is contained within an area bounded by said two tangent lines and by a line that is tangent to an imaginary circle and perpendicular to the straight line connecting the intersection of said two tangent lines with the center of the imaginary circle, and that passes between said intersection and the center of said imaginary circle, when said imaginary circle, of radius Rmin as defined below, is inscribed in the area that is in the bight of said two tangent lines:
- .theta.c=2 tan.sup.-1 {(S2-1)/2S},
- where:
- S=YO/RO;
- Rmin=[RO+{RO/sin (.theta./2)}-{YO/tan (.theta./2)}]/[1-{1/sin (.theta./2)}];
- RO is the optical fiber radius; and
- 2YO is the interval between the concavities when at least two groove-shaped concavities are formed by the grindstone in a mold material that is to be the mold, so as to form the optical fiber engagement portion(s) between the concavities; and said method comprises the steps of forming a plurality of concavities extending in a prescribed direction, of such depth that said intersection between said two tangent lines will be at a position deeper than dmin, by a grinding process, on the flat surface of the mold material, in a direction perpendicular to said prescribed direction, and such that the interval between at least two of said concavities becomes 2YO; wherein
- dmin=[YO-RO.multidot.tan {(.pi.-.theta.)/4}]/tan (.theta./2).
- 9. A method of fabricating a mold for fabricating optical fiber guide blocks, for the purpose of molding by press-molding process at least the optical fiber engagement portions of said optical fiber guide blocks, said optical fiber guide blocks comprising:
- groove-shaped optical fiber engagement portion(s) for the purpose of positioning optical fibers; wherein a grindstone is used comprising two main grinding surfaces that machine formed surfaces that support the sides of said optical fibers; wherein the angle .theta. subtended by the two tangent lines in a cross-section perpendicular to said main grinding surfaces constitutes an angle that exceeds .theta.c which satisfies the relationship noted below:
- .theta.c=2 tan.sup.-1 {(S.sup.2 -1)/2S},
- where:
- RO is the optical fiber radius; and
- YO is half the pitch length of the optical fiber engagement portion; and sad method comprises the steps of forming a plurality of concavities extending in a prescribed direction, of such depth that said intersection between said two tangent lines will be at a position deeper than dmin, by a grinding process, on the flat surface of the mold material, in a direction perpendicular to said prescribed direction, and such that the interval between at least two of said concavities becomes 2YO; wherein
- dmin=[YO-RO.multidot.tan {(.pi.-.theta.)/4}]/tan (.theta./2).
- 10. A method of fabricating a mold for fabricating optical fiber guide blocks, for the purpose of molding by press-molding process at least the optical fiber engagement portions of said optical fiber guide blocks, said optical fiber guide blocks comprising:
- groove-shaped optical fiber engagement portion(s) for the purpose of positioning optical fibers; wherein a grindstone is used comprising two main grinding surfaces that machine formed surfaces that support the sides of said optical fibers; wherein the angle .theta. subtended by the two tangent lines in a cross-section perpendicular to said main grinding surfaces constitutes an angle that exceeds .theta.c which satisfies the relationship noted below:
- .theta.c=2 tan.sup.-1 {(S.sup.2 -1)/2S},
- where:
- S=YO/RO;
- RO is the optical fiber radius; and
- 2YO is the interval between the concavities when at least two groove-shaped concavities are formed by the grindstone in a mold material that is to be the mold, so as to form the optical fiber engagement portion between the concavities; and said method comprises the steps of forming a plurality of concavities extending in a prescribed direction, of such depth that said intersection between said two tangent lines will be at a position deeper than dmin, by a grinding process, on the flat surface of the mold material, in a direction perpendicular to said prescribed direction, and such that the interval between at least two of said concavities becomes 2YO; wherein
- dmin=[YO-RO.multidot.tan {(.pi.-.theta.)/4}]/tan (.theta./2).
- 11.
- 11. The method of fabricating a mold for fabricating optical fiber guide blocks, according to claim 2, wherein concavities are machined at a depth such that said intersection between said two tangent lines becomes a position that is shallower than dmax, as defined below:
- dmax=YO/tan (.theta./2).
- 12. The method of fabricating a mold for fabricating optical fiber guide blocks, according to claim 11, comprising: a process for machining such that, after grinding-machining said concavities, outside of the two grooves positioned outermost among said grooves, the portions which connect to the bottoms of at least said two grooves are in the same plane as said bottoms of said two grooves.
- 13. A method of fabricating optical fiber guide blocks comprising:
- using a mold for fabricating optical fiber guide blocks that comprises:
- convexities that extend in the longitudinal dimension of the forming surface; and
- concavities that extend in the longitudinal dimension, arrayed with said convexities sandwiched in between them;
- wherein the tangent lines at the points where are formed the portions of the two sloping surfaces that configure said concavities in a cross-section perpendicular to the longitudinal dimension of said concavities, which portions are to support optical fibers, subtend an angle .theta. that is equal to or smaller than .theta.c which satisfies the relationship noted below;
- the perpendicular cross-sectional shape of said concavities is such that the contour thereof is contained within an area bounded by the two tangent lines that touch said sloping surfaces and by a line that is tangent to an imaginary circle and perpendicular to the straight line connecting the intersection of said two tangent lines with the center of said imaginary circle, and that passes between said intersection and said center of said imaginary circle, when said imaginary circle, of radius Rmin as defined below, is inscribed in the area that is in the bight of said two tangent lines;
- the depth of said concavities is such that said intersection of said two tangent lines is at a position deeper than dmin, as defined below; and
- one or other of said sloping surfaces that form said concavities is what forms the surfaces that support said optical fibers in said optical fiber engagement portions:
- .theta.c=2 tan.sup.-1 {S.sup.2 -1)/2S},
- where:
- S=YO/RO;
- Rmin=[RO+{RO/sin (.theta./2)}-{YO/tan (.theta./2)}]/[1-{1/sin (.theta./2)}];
- dmin=[YO-RO.multidot.tan {(.pi.-.theta.)/4}]/tan (.theta./2);
- RO is the optical fiber radius; and
- 2YO is the interval between the concavities arrayed so as to sandwich the convexities between them; and
- press molding the raw material to be molded under heat.
- 14. A method of fabricating optical fiber guide blocks comprising:
- using a mold for fabricating optical fiber guide blocks that comprises:
- a plurality of concavities that extend in one direction in a forming surface;
- wherein the tangent lines at the points where the portions that are to support said optical fibers at the two sloping surfaces which configure the concavities, in a cross-section that is perpendicular to the longitudinal dimension of said concavities, subtend an angle .theta. that exceeds .theta.c which satisfies the relationship noted below;
- the depth of said concavities is such that said intersection of said tangent lines is at a position deeper than dmin, as defined below; and
- the forming surfaces between said concavities are what form optical fiber engagement portions:
- .theta.c=2 tan.sup.-1 {S.sup.2 -1)/2S},
- where:
- S=YO/RO;
- dmin=[YO-RO.multidot.tan {(.pi.-.theta.)/4}]/tan (.theta./2);
- RO is the optical fiber radius; and
- YO is half the pitch length of the optical fiber engagement portion; and
- press molding the raw material to be molded under heat.
- 15. A method of fabricating optical fiber guide blocks comprising:
- using a mold for fabricating optical fiber guide blocks that comprises:
- convexities that extend in the longitudinal dimension of a forming surface; and
- concavities that extend in the longitudinal dimension, arrayed with the convexities sandwiched in between them; wherein the tangent lines at the points where are formed the portions of the two sloping surfaces that configure said concavities in a cross-section perpendicular to the longitudinal dimension of said concavities, which portions are to support optical fibers, subtend an angle .theta. that exceeds .theta.c which satisfies the relationship noted below;
- the depth of said concavities is such that the intersection of said tangent lines is at a position deeper than dmin, as defined below; and
- one or other of the sloping surfaces that form the concavities is what forms the surfaces that support said optical fibers in the optical fiber engagement portions:
- .theta.c=2 tan.sup.-1 {S.sup.2 -1)/2S},
- where:
- S=YO/RO;
- dmin=[YO-RO.multidot.tan {(.pi.-.theta.)/4}]/tan (.theta./2);
- RO is the optical fiber radius; and
- 2YO is the interval between the concavities arrayed so as to sandwich the convexities between them; and
- press molding the raw material to be molded under heat.
Priority Claims (2)
Number |
Date |
Country |
Kind |
9-62796 |
Mar 1997 |
JPX |
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10-17266 |
Jan 1998 |
JPX |
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Parent Case Info
This is a divisional of application Ser. No. 09/042,947 filed Mar. 17, 1998 now U.S. Pat. No. 6,032,490, the disclosure of which is incorporated herein by reference.
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Divisions (1)
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Number |
Date |
Country |
Parent |
042947 |
Mar 1998 |
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