Abstract: An ink set including at least three colors of inks of yellow ink with a hue angle ?H°, as defined in CIELAB color space on a recording medium, in the range of about 80° to about 110°, magenta ink with a hue angle ?H° in the range of about 330° to about 360°, and cyan ink with a hue angle ?H° in the range of about 230° to about 260°, and the following ink (A) and ink (B): ink (A): ink with a hue angle ?H° in the range of about 0° to about 80°; and ink (B): ink with a hue angle ?H° in the range of about 0° to about 80° (where the ink (A) has higher saturation and lower brightness than the magenta ink, and the ink (B) has higher saturation and higher brightness than the magenta ink and higher saturation and lower brightness than the yellow ink, and the hue angle (?H°) is determined as hue angle ?H°=tan?1(b*/a*)+180 (when a*<0) or ?H°=tan?1(b*/a*)+360 (when a*>0), a* and b* representing the perceived chromaticity index as defined in CIELAB color space).

Abstract: An ink set, including at least three colors of ink consisting of a yellow ink, in which the hue angle ?H° defined in the CIELAB color space on a recording medium is within the range of about 80° C. to about 110° C.

Abstract: A transformer driver capable of making a load current constant with a simple configuration is provided. A driver 10 of the present invention applies a drive voltage Vd to the primary side of a piezoelectric transformer 11 in which a load 12 is connected to the secondary side. The angular frequency ?0 of the drive voltage Vd is a series resonance angular frequency given by an equivalent circuit on the output side of the driver 10. With the driver 10, a load current IL can be constant irrespective of the impedance ZL of the load 12 with a simple configuration. Therefore, the load current IL can always be constant even if the impedance ZL of the load 12 varies.

Abstract: A driving circuit is composed of a discontinuous rectangle wave oscillator and a lowpass filter. A discontinuous rectangle wave used herein is composed of voltages Vp, 0 and ?Vp. Assuming one cycle is T, a discontinuous rectangle wave has such a configuration that a potential from a time 0 to a time ø is a potential 0, from the time ø to a time (T/6?ø) is a potential Vp, from the time (T/6?ø) to a time (T/3+ø) is a potential 0, . . . . Since the third harmonic wave is not included in the discontinuous waveform, the inductance of the lowpass filter can be reduced. Consequently, the lowpass filter may be omitted. Further, the amplitude of the fundamental wave can be changed by varying the phase difference ø.

Abstract: There is provided an ink composition for ink jet recording, which can yield images having excellent gloss with good color reproduction even on various recording media having a low level of water absorption, especially synthetic paper and printing paper for running-on. The ink composition for ink jet recording comprises a colorant, water, an alkanediol, and a surfactant, wherein the alkanediol comprises a water-soluble 1,2-alkanediol, a poor water-soluble 1,2-alkanediol, and a poor water-soluble both terminal alkanediol, and the alkanediol satisfies a requirement on a weight basis of A:(B+C)=2:1 to 2:3 wherein A represents the content of the water-soluble 1,2-alkanediol in the alkanediol; B represents the content of the poor water-soluble 1,2-alkanediol in the alkanediol; and C represents the content of the poor water-soluble both terminal alkanediol in the alkanediol.

Abstract: [Problem] A driving circuit of a piezoelectric transformer capable of placing insulation between a primary side and secondary side of each of piezoelectric transformers is provided [Means for solving] In the driving circuit of piezoelectric transformers including piezoelectric transformers 11 to output a specified voltage to cold cathode fluorescent lamps 12, a driving section 50 to apply a voltage V used to drive the piezoelectric transformers 11, a frequency controlling section 51 to control the driving section 50, and a phase detecting section 52 to transmit a detecting signal to the frequency controlling section 51, primary sides of every two out of the piezoelectric transformers 11 are serially connected to one another, making up one pair of piezoelectric transformers 11 and every three pairs of said piezoelectric transformers 11 is connected in parallel to the driving unit and one end portion of each of the cold cathode fluorescent lamps 12 with a same plurality of numbers as for the piezoelectric trans

Abstract: The present invention provides a piezoelectric transformer driving apparatus which drives a load balanced to the ground, which makes an insulating component, such as a current transformer or a photocoupler, unnecessary, and which can detect a load current.

Abstract: An object of the present invention is to provide a dispersion useful for the preparation of a white ink composition having a high level of opacifying properties, and an ink composition obtained from the dispersion. The dispersion of the invention is a dispersion containing hollow polymer fine particles, wherein the hollow polymer fine particles comprise a plurality of fine particle subgroups, and the difference in average particle size between the respective fine particle subgroups adjacent to each other in terms of average particle size is less than 100 nm. The ink composition of the invention contains the dispersion.

Abstract: An ink set, including at least three colors of ink consisting of a yellow ink, in which the hue angle ?H° defined in the CIELAB color space on a recording medium is within the range of about 80° C. to about 110° C.

Abstract: There is provided an ink composition for ink jet recording that, even on printing paper for running-on, can realize excellent gloss and good color reproduction and, at the same time, is excellent in ejection stability and recovery from clogging. The ink composition for ink jet recording comprises at least a colorant, water, an alkanediol, and a surfactant, wherein the alkanediol comprises a water soluble 1,2-alkanediol and a slightly water soluble 1,2-alkanediol, and the surfactant is a polyorganosiloxane.

Abstract: There is provided an ink composition that, even on various recording media, especially gloss paper of a printing paper base, can yield an image having excellent gloss, can realize good recovery from clogging and handleability of recorded matter, and, at the same time, can realize excellent ejection stability and color reproduction. The ink composition for ink jet recording comprises at least a colorant, water, an alkanediol, and a surfactant, wherein the alkanediol comprises a water soluble 1,2-alkanediol and a water soluble alkanediol having a hydroxyl group at both ends of its main chain, and the surfactant is a polyorganosiloxane.

Abstract: An ink set, provided with at least a magenta ink composition, a yellow ink composition and a cyan ink composition, wherein the magenta ink composition has an L* value of 60 or more and a b* value of ?17 or less when the CIE standard a* value as calculated from the visible absorption spectrum in an aqueous solution diluted 10,000-fold or less is 80.

Abstract: The present invention provides an oil-based dispersion containing hollow polymer fine particles, wherein the above-mentioned hollow polymer fine particles contain a plurality of fine particle subgroups, and the difference in average particle size between the respective fine particle subgroups adjacent to each other in terms of average particle size is less than 100 nm. Further, an oil-based ink composition containing the above-mentioned oil-based dispersion is also disclosed.

Abstract: Disclosed is an ink composition for ink jet recording, which possesses excellent gloss and good color reproducibility on various recording media, especially printing paper for running-on. The ink composition for ink jet recording comprises at least a colorant, water, an alkanediol, and a surfactant, wherein the alkanediol comprises a water soluble 1,2-alkanediol and a water insoluble both terminal alkanediol.

Abstract: A piezoelectric transformer driving apparatus and a piezoelectric transformer driving method, wherein even if there exists a variation between piezoelectric transformers, no unnecessary resonant points occur in the vicinity of a frequency used, that is, the output is stable for the frequency. For this purpose, the primary electrodes (1b, 2a) of a pair of piezoelectric transformers (1, 2) that exhibit potentials of mutually different signs on their respective secondary sides are connected to each other, while the piezoelectric transformers (1, 2) are connected in series with an AC power supply. An input voltage is applied between the primary electrodes (1a, 2b), and the outputs are supplied to a load, whereby even if there exists a variation between the vibrations of the piezoelectric transformers, it results in only a single resonant point existing.

Abstract: The present invention provides a piezoelectric transformer driving apparatus which drives a load balanced to the ground, which makes an insulating component, such as a current transformer or a photocoupler, unnecessary, and which can detect a load current.

Abstract: A water base dispersion solution including hollow polymer microparticles, wherein the hollow polymer microparticles are composed of a plurality of microparticle subgroups, and the difference in the mean particle size between microparticle subgroups that are mutually adjacent in terms of mean particle size is less than 100 nm.

Abstract: A driving circuit is composed of a discontinuous rectangle wave oscillator and a lowpass filter. A discontinuous rectangle wave used herein is composed of voltages Vp, 0 and ?Vp. Assuming one cycle is T, a discontinuous rectangle wave has such a configuration that a potential from a time 0 to a time ø is a potential 0, from the time ø to a time (T/6?ø) is a potential Vp, from the time (T/6?ø) to a time (T/3+ø) is a potential 0, . . . . Since the third harmonic wave is not included in the discontinuous waveform, the inductance of the lowpass filter can be reduced. Consequently, the lospass filter may be omitted. Further, the amplitude of the fundamental wave can be changed by varying the phase difference ø.

Abstract: There is provided a white pigment for a water-based ink that has excellent reliability against clogging and stability of pigment against settling and, at the same time, has a high level of covering power. The white pigment for a water-based ink comprises particles each comprising: a core particle formed of a material having a lower specific gravity than titanium oxide; and a titanium oxide layer covering the surface of the core particle, the pigment having a particle diameter of 0.05 to 5 ?m.

Abstract: It is an object of the present invention to provide a pigment dispersion, an ink composition, and an ink set, enabling excellent glossiness, bronzing prevention, and ink composition storage stability to be realized. The present invention provides a pigment dispersion characterized by comprising at least a pigment, an aqueous medium, a copolymer resin between a hydrophobic monomer and a hydrophilic monomer, and a urethane resin, and also an ink composition characterized by containing at least the pigment dispersion and an aqueous medium, and an ink set characterized by comprising at least the ink composition.