Method for producing spacer and spacer
AssigneeCanon Kabushiki Kaisha
InventorKohei Nakata
Life of this patent
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Abstract
In a method of producing a spacer for a display apparatus by heat drawing a base glass material having a cross section with different dimensions in a longitudinal and lateral directions and then cutting into a desired length, a base glass material in which a high-viscosity glass material is combined on both ends of a low-viscosity glass material is drawn within a temperature range in which both glass materials have different viscosities. Such method avoids a deformation of the spacer such as an expansion or a rounding at the longitudinal ends in the cross section of the spacer or a constriction in an intermediate portion in the longitudinal direction.
Claims23
A method for producing a spacer by drawing a base glass material, having a cross sectional shape with different dimensions in vertical and lateral directions, under heating to a drawing temperature, and then by cutting into a desired length, wherein:
- in a longitudinal direction of a cross section of the base glass material, a high-viscosity glass material is combined in at least both end portions of the low-viscosity glass material to obtain an entire cross-sectional shape having different dimensions in vertical and lateral directions, and said base glass material is drawn under heating at a drawing temperature at which both the low-viscosity glass material and the high-viscosity glass material have a viscosity within a range of 105 to 1010 dPa·s and the high-viscosity glass material has a viscosity higher than that of the low-viscosity glass material.
A spacer having a cross sectional shape with different dimensions in vertical and lateral directions, wherein:
- in a longitudinal direction of a cross section of the spacer, a high-viscosity glass material is integrated with at least both end portions of a low-viscosity glass material to obtain a cross-sectional shape having different dimensions in vertical and lateral directions, and the high-viscosity glass material shows a viscosity higher than that of the low-viscosity glass material in a state heated at a temperature at which both the low-viscosity glass material and the high-viscosity glass material have a viscosity within a range of 105 to 1010 dPa·s.
A method for producing a spacer having irregularities on a surface thereof by drawing a base glass material, having a cross sectional shape with different dimensions in vertical and lateral directions and having plural grooves on an external surface along a longitudinal direction of the cross section, under heating to a drawing temperature and then by cutting into a desired length, wherein:
- the base glass material has a composite structure constituted of a low-viscosity glass material positioned in an internal layer of the base glass material and a high-viscosity glass material provided in an area including at least an external surface along the longitudinal direction of said cross section in a surface layer of the base glass material;
- the high-viscosity glass material at least includes a member having plural grooves on an external surface side;
- and
- the base glass material is drawn under heating to a drawing temperature at which both the low-viscosity glass material and the high-viscosity glass material have a viscosity within a range of 105 to 1010 dPa·s and the high-viscosity glass material has a viscosity higher than that of the low-viscosity glass material.
A spacer having irregularities on a surface thereof, comprising a composite structure integrated by a low-viscosity glass material positioned in an internal layer of the spacer and a high-viscosity glass material provided in at least an area having the irregularities in an external surface of the spacer;
- wherein the high-viscosity glass material has a higher viscosity than that of the low-viscosity glass material in a heated state at a temperature at which both the low-viscosity glass material and the high-viscosity glass material have a viscosity within a range of 105 to 1010 dPa·s.
Dependencies are inferred from the claim text.