1. An ultrasonic hair treatment device comprising a vibrator having a vibration element for generating ultrasonic vibrations and a receiver facing the vibrator as to apply the ultrasonic vibrations to a bundle of hairs which is pinched between the vibrator and the receiver, characterized by that
the vibration element has an oblong plate shape so as to have a plurality of resonance points arranged like a periodic lattice on a vibration face disposed in a thickness direction thereof;
the vibrator has a header having an oblong plate shape and laminated on the vibration face of the vibration element;
a plurality of concave portions for trapping a hair treatment agent therein is formed on a face of the header facing the receiver so as to include points corresponding to the resonance points of the vibration element;
the concave portions are circular recesses, each formed at a point corresponding to each of the resonance points of the vibration element; and
a reception face of the receiver facing a vibration face of the header is formed to be flat.
2. The ultrasonic hair treatment device in accordance with claim 1, wherein
the vibration element utilizes a vibration mode of longitudinal piezoelectric effect in the thickness direction thereof.
3. The ultrasonic hair treatment device in accordance with claim 1, wherein
the receiver is made of a synthetic resin foam.
4. The ultrasonic hair treatment device in accordance with claim 1, wherein
a pair of pinching members, rear end of which are hinged; and
the vibrator and the receiver are respectively provided at front end portions of the pinching members so that a longer side of the oblong plate shape becomes parallel to a longitudinal direction of the pinching member.
5. The ultrasonic hair treatment device in accordance with claim 1, wherein
the vibration face of the header except the recesses is formed to be flat so as to be contacted with the reception face of the receiver, closely.
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. An active energy ray-curable inkjet magenta ink composition, comprising two kinds of quinacridone pigments, wherein the two kinds of quinacridone pigments are (A) unsubstituted quinacridone and (B) 2,9-dimethylquinacridone, said two kinds of quinacridone pigments having distinct crystal structures from one another and being present as individual components in said composition and not in the form of a solid solution.
2. The magenta ink composition according to claim 1, wherein the weight ratio of the unsubstituted quinacridone (A) and the 2,9-dimethylquinacridone (B) is (A):(B)=from 75:25 to 40:60.
3. An active energy ray-curable inkjet ink set, comprising:
the magenta ink composition of claim 1;
an active energy ray-curable inkjet yellow ink composition; and
an active energy ray-curable inkjet cyan ink composition.
4. The ink set according to claim 3, wherein the active energy ray-curable inkjet yellow ink composition comprises a yellow pigment having a benzimidazolone backbone or an isoindoline backbone.
5. An active energy ray-curable inkjet ink set, comprising:
the magenta ink composition of claim 2;
an active energy ray-curable inkjet yellow ink composition; and
an active energy ray-curable inkjet cyan ink composition.
6. The ink set according to claim 5, wherein the active energy ray-curable inkjet yellow ink composition comprises a yellow pigment having a benzimidazolone backbone or an isoindoline backbone.
7. The magenta ink composition according to claim 1, further comprising dipropylene glycol diacrylate.
8. The magenta ink composition according to claim 1, further comprising a polymerizable compound, wherein the content of the polymerizable compound in the ink composition is 60 to 95% by weight based on the total weight of the ink composition.
9. The magenta ink composition according to claim 8, comprising dipropylene glycol diacrylate as the polymerizable compound.
10. The magenta ink composition according to claim 1, further comprising a pigment dispersing agent.
11. The magenta ink composition according to claim 10, wherein the pigment dispersing agent is a basic pigment dispersing agent.
12. The magenta ink composition according to claim 2, wherein the weight ratio of the unsubstituted quinacridone (A) and the 2,9-dimethylquinacridone (B) is (A):(B)=from 75:25 to 50:50, said ink composition further comprising a polymerizable compound, wherein the content of the polymerizable compound in the ink composition is 60 to 95% by weight based on the total weight of the ink composition.
13. The magenta ink composition according to claim 12, further comprising a pigment dispersing agent.
14. The magenta ink composition according to claim 13, wherein the pigment dispersing agent is a basic pigment dispersing agent.