Ink set and ink-jet recording method
AssigneeSeiko Epson Corporation
InventorsShuichi Kataoka, Kiyohiko Takemoto
Life of this patent
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Abstract
The present invention provides an ink set comprising at least three color inks, which are yellow ink whose hue angle H°, as defined in the CIELAB color space on a recording medium (PM-photographic paper; same below), is in a range of about 80° to about 110°, magenta ink whose hue angle H° is in a range of about 330° to about 360°, and cyan ink whose hue angle H° is in a range of about 230° to about 260°, and further comprising ink (A) and/or ink (B) described below. With the present ink set, it is possible to provide a highly reliable ink set that can be used in inkjet recording and can produce printed matter having a wide color reproduction range, high color saturation, good graininess, and an adequate glossy look.
Claims45
An ink set comprising at least three color inks, which are yellow ink whose hue angle H°, as defined in the CIELAB color space on a recording medium, is in a range of about 80° to about 110°;
- magenta ink whose hue angle H° is in a range of about 330° to about 360°;
- and cyan ink whose hue angle H° is in a range of about 230° to about 260°0;
- and further comprising ink (A) and/or ink (B) described below.
- Ink (A) :
- an ink whose hue angle H° is about 0° to about 80°:
- Ink (B):
- an ink whose hue angle H° is about 260° to about 330°.
- [The hue angle H° is calculated from H°=tan−1 (b*/a*)+180 (where a*<0), or H°=tan−1 (b*/a*)+360 (where a*>0). Here, a* and b* express chromaticity indices defined in the CIELAB color space.]
An ink set comprising a yellow ink having an absorption spectrum in which the absorption area between 400 nm and 500 nm is no less than 30 abs·nm and no more than 350 abs·nm, a magenta ink having an absorption spectrum in which the absorption area between 500 nm and 600 nm is no less than 20 abs·nm and no more than 200 abs·nm, a cyan ink having an absorption spectrum in which the absorption area between 600 nm and 700 nm is no less than 50 abs·nm and no more than 400 abs·nm, and ink (A) and/or ink (B) described below.
- Ink (A):
- an ink whose absorption area between 500 nm and 600 nm is equal to or greater than the absorption area between 500 nm and 600 nm of the magenta ink.
- Ink (B):
- an ink whose absorption area between 500 nm and 600 nm is equal to or greater than the absorption area between 600 nm and 700 nm of the cyan ink.
An ink set comprising a yellow ink having an absorption spectrum in which the absorption area between 400 nm and 500 nm is no less than 30 abs·nm and no more than 350 abs·nm, a magenta ink having an absorption spectrum in which the absorption area between 500 nm and 600 nm is no less than 20 abs·nm and no more than 200 abs·nm, a cyan ink having an absorption spectrum in which the absorption area between 600 nm and 700 nm is no less than 50 abs·nm and no more than 400 abs·nm, and ink (A) and/or ink (B) described below.
- Ink (A):
- an ink whose absorption area between 400 nm and 500 nm of ink (A) is no less than 0.5 times and no more than 2.0 times the absorption area between 500 nm and 600 nm of ink (A).
- Ink (B):
- an ink whose absorption area between 500 nm and 600 nm of ink (B) is no less than 0.5 times and no more than 5.0 times the absorption area between 600 nm and 700 nm of ink (B).
Dependencies are inferred from the claim text.