Liquid injection recording system, a liquid injection head, a base plate for the recording head, and a recording apparatus having the liquid injection recording head

Claim 2

A liquid injection recording system for injecting liquid by utilizing thermal energy generated upon application of an electrical signal to an electro-thermal conversion element, characterized in that a substance whose electrical resistance is varied by phase transition is used for a portion of said electro-thermal conversion element and harmonious recording is effected by the utilization of the phase transition characteristic of said substance.

Claim 3

A liquid injection recording system according to claim 1, wherein said phase transition is caused by the heat generated by said electro-thermal conversion element.

Claim 4

A liquid injection recording system according to claim 1, wherein said substance is at least a part of the resistance material of said electro-thermal conversion element.

Claim 5

A liquid injection recording head provided with a base plate having an electro-thermal conversion element provided with a resistance material provided on a support member and a set of electrodes electrically connected to said resistance material and disposed at an interval, a heat-acting zone including a portion in which heat energy generated by said electro-thermal conversion element acts on liquid, and a discharge port which is a portion which is communicated with said heat-acting zone and through which the liquid is discharged by the action of said heat energy, characterized in that at least a part of said resistance material consists of a substance whose electrical resistance is varied by phase transition.

Claim 6

A liquid injection recording head provided with a base plate having an electro-thermal conversion element provided with a resistance material provided on a support member and a set of electrodes electrically connected to said resistance material and disposed at an interval, a heat-acting zone including a portion in which heat energy generated by said electro-thermal conversion element acts on liquid, and a discharge port which is a portion which is communicated with said heat-acting zone and through which the liquid is discharged by the action of said heat energy, characterized in that at least a part of said resistance material consists of a substance whose electrical resistance is varied by phase transition.

Claim 7

A liquid injection recording head according to claim 4, wherein said substance is a substance in which phase transition occurs due to heat energy.

Claim 8

A liquid injection recording head according to claim 5, wherein said substance is a substance chosen from among V 8 C 7 , V 6 C 5 and Ta.

Claim 9

A liquid injection recording head according to claim 4, wherein said support member has a heat accumulating layer.

Claim 10

A liquid injection recording head according to claim 4, wherein said electro-thermal conversion element has a protective layer on said heat-acting zone side.

Claim 11

A liquid injection recording head according to claim 4, wherein said substance is connected to one of said electrodes and is connected to the other of said electrodes through a resistance material.

Claim 12

A liquid injection recording head according to claim 4, wherein said substance and said resistance material are connected to said set of electrodes and said substance is disposed adjacent to said resistance material.

Claim 13

A liquid injection recording head according to claim 10, wherein said substance and said resistance material are in contact with each other.

Claim 14

A base plate for a liquid injection recording head having an electro-thermal conversion element provided with a resistance material provided on a support member and a set of electrodes electrically connected to said resistance material and disposed at an interval, characterized in that at least a part of said resistance material consists of a substance whose electrical resistance is varied by phase transition.

Claim 15

A base plate for a liquid injection recording head having an electro-thermal conversion element provided with a resistance material provided on a support member and a set of electrodes electrically connected to said resistance material and disposed at an interval, characterized in that at least a part of said resistance material consists of a substance whose electrical resistance is varied by phase transition.

Claim 16

A base plate according to claim 12, wherein said substance is a substance in which phase transition occurs due to heat energy.

Claim 17

A base plate according to claim 13, wherein said substance is chosen from among V 8 C 7 , V 6 C 5 and Ta.

Claim 18

A recording apparatus having a liquid injection recording head provided with a base plate having an electro-thermal conversion element provided with a resistance material provided on a support member and a set of electrodes electrically connected to said resistance material and disposed at an interval, a heat-acting zone including a portion in which heat energy generated by said electro-thermal conversion element acts on liquid, and a discharge port which is a portion which is communicated with said heat-acting zone and through which the liquid is discharged by the action of said heat energy, and drive means for driving said recording head, characterized in that at least a part of said resistance material consists of a substance whose electrical resistance is varied by phase transition.

Claim 19

A recording apparatus having a liquid injection recording head provided with a base plate having an electro-thermal conversion element provided with a resistance material provided on a support member and a set of electrodes electrically connected to said resistance material and disposed at an interval, a heat-acting zone including a portion in which heat energy generated by said electro-thermal conversion element acts on liquid, and a discharge port which is a portion which is communicated with said heat-acting zone and through which the liquid is discharged by the action of said heat energy, and drive means for driving said recording head, characterized in that at least a part of said resistance material consists of a substance whose electrical resistance is varied by phase transition.

Claim 20

A recording apparatus according to claim 15, wherein said substance is a substance in which phase transition occurs due to heat energy.

Claim 21

A recording apparatus according to claim 16, wherein said substance is a substance chosen from among V 8 C 7 V 6 C 5 and Ta.