Recording head which detects temperature of an element chip and corrects for variations in that detected temperature, and cartridge and apparatus having such a head

• US 5,696,543 A
• Filed: 12/09/1994
• Issued: 12/09/1997
• Est. Priority Date: 12/10/1993
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Koizumi, Ryoichi, Watanabe, Yasutomo
• Primary Examiner(s): Fuller, Benjamin R.
• Assistant Examiner(s): HALLACHER, CRAIG ALAN
• Application Number:
  US08/352,586
• Time in Patent Office: 1,096 Days
• Field of Search: 347/14, 347/17, 347/58, 347/67, 347/56, 347/57, 219/499, 219/505
• US Class Current: 347/17
• CPC Class Codes: B41J 2/04563 detecting head temperature; Ink temperature
• CPC Class Codes: B41J 2/0458 controlling heads based on heating elements forming bubbles
• CPC Class Codes: B41J 2/14153 Structures including a sensor
• CPC Class Codes: B41J 2002/14379 Edge shooter

Abstract

A liquid ejecting recording head using thermal energy to eject liquid for recording an image, includes an element chip having a plurality of electrothermal transducer elements for producing thermal energy to create bubbles to ejecto the liquid; a temperature detecting element disposed on the element chip to detect a temperature of the chip; liquid passages, disposed on the chip, corresponding to the electrothermal transducer elements having an opening at an end; correcting means for correcting an output of the temperature detecting element.

Claims

1. A liquid ejecting recording head for mounting on a printing apparatus and which ejects a liquid for recording images, comprising:

an element chip having a plurality of electrothermal transducer elements for producing thermal energy to create bubbles to eject the liquid;

a temperature detecting element disposed on said element chip to detect a temperature of said element chip;

a plurality of liquid passages, disposed on the element chip, corresponding to the electrothermal transducer elements, each said liquid passage having an opening at an end;

correcting means for correcting a variation of the temperature detected by said temperature detecting element.

3. A liquid ejecting recording head according to claim 1 or 2, wherein said temperature detecting element has metallic wire.

4. A liquid electing recording head according to claim 1 or 2, wherein said temperature detecting element has a diode or transistor.

5. A liquid ejecting recording head according to claim 1 or 2, wherein said correcting means has a film resistor.

6. A liquid electing recording head according to claim 5, wherein said correcting means has a trimming resistor.

7. A liquid ejecting recording head according to claim 1 or 2, wherein a temperature dependency of said correcting means is less than that of said temperature detecting element.

8. A liquid electing recording head according to claim 7, wherein a temperature coefficient of resistance of said correcting means is no more than 1/10 of that of said temperature detecting element.

9. A liquid ejecting recording head according to claim 1 or 2, wherein a bridge circuit including includes the temperature detecting sensor and correcting means is formed.

10. A liquid ejecting recording head according to claim 1 or 2, wherein the liquid passages are filled with liquid.

11. A liquid ejecting recording head according claim 1, 2, wherein the liquid is ink.

2. A liquid ejecting recording head for mounting on a printing apparatus and which ejects a liquid for recording images, comprising:

an element chip having a plurality of electrothermal transducer elements for producing thermal energy to create bubbles to eject the liquid;

a temperature detecting element for detecting a temperature of said element chip;

correcting means for correcting a variation of said temperature detecting element, said correcting means including said temperature detecting element and a correcting element; and

a plurality of liquid passages, disposed on the element chip corresponding to the electrothermal transducer elements and each said liquid passage having an opening for ejecting the liquid at an end.

12. A liquid ejecting recording head cartridge for ejecting a liquid to record an image, comprising:

a liquid ejecting recording head which ejects the liquid for recording the image, including an element chip having a plurality of electrothermal transducer elements for producing thermal energy to create bubbles to eject the liquid, a temperature detecting element disposed on said element chip for detecting a temperature on said chip, correcting means for correcting a variation of said temperature detecting element, said correcting means including said temperature detecting element and a correcting element, and a plurality of liquid passages, disposed on said element chip corresponding to the electrothermal transducer element, and each said liquid passage having an opening for ejecting the liquid at an end; and

a liquid container for containing the liquid to be supplied to the recording head.

13. A liquid ejecting recording head according to claim 12, wherein said temperature detecting element has a diode or transistor.

14. A liquid ejecting recording head according to claim 12, wherein said correcting means has a film resistor.

15. A liquid ejecting recording head according to claim 14, wherein said correcting means has a trimming resistor.

16. A liquid ejecting recording head according to claim 12, wherein a temperature dependency of said correcting means is less than that of said temperature detecting element.

17. A liquid ejecting recording head according to claim 16, wherein a temperature coefficient of resistance of said correcting means is no more than 1/10 of that of said temperature detecting element.

18. A liquid ejecting recording head according to claim 17, wherein a bridge circuit including said the temperature detecting sensor and correcting means is formed.

19. A liquid ejecting recording head according to claim 12, wherein the liquid passages are filled with liquid.

20. A liquid ejecting recording head according to claim 12 or 19, wherein the liquid is ink.

21. A liquid ejecting recording apparatus for ejecting a liquid to record an image, comprising:

a liquid ejecting recording head that elects the liquid for recording the image, including an element chip having a plurality of electrothermal transducer elements for producing thermal energy to create bubbles to eject the liquid, a temperature detecting element disposed on said element chip for detecting a temperature of said element chip, a plurality of liquid passages, disposed on said element chip, corresponding to the electrothermal transducer elements and each said liquid passage having an opening at an end, and correcting means for correcting a variation of the temperature detected by said temperature detecting element; and

conveying means for conveying a recording medium for receiving the liquid ejected from the liquid ejecting recording head.

22. A liquid ejecting recording apparatus that ejects a liquid to record images, comprising:

a liquid ejecting recording head which ejects the liquid for recording the images, including an element chip having a plurality of electrothermal transducer elements for producing thermal energy to create bubbles to eject the liquid, a temperature detecting element disposed on said element chip to detect a temperature of said element chip, a plurality of liquid passages, disposed on said element chip, corresponding to the electrothermal transducer elements and each said liquid passage having an opening at an end, and correcting means for correcting a variation of the temperature detected by said temperature detecting element; and

a driving signal supplying means for supplying a signal for driving the liquid ejecting head, to the liquid ejecting recording head.

25. A liquid ejecting recording head according to claims 22, 22, 23 or 24, wherein said temperature detecting element has a diode or transistor.

26. A liquid ejecting recording head according to claims 22, 22, 23 or 24, wherein said correcting means has a film resistor.

27. A liquid ejecting recording head according to claim 22, 22, 23 or 24, wherein said correcting means has a trimming resistor.

28. A liquid ejecting recording head according to claims 22, 22, 23 or 24, wherein said temperature dependency of the correcting means is less than that of said temperature detecting element.

29. A liquid ejecting recording head according to claims 22, 22, 23 or 24, wherein the temperature coefficient of resistance of the correcting means is no more than 1/10 of that of said temperature detecting element.

30. A liquid ejecting recording head according to claim 22, 22, 23 or 24, wherein a bridge circuit including said temperature detecting sensor and correcting means is formed.

31. A liquid ejecting recording head according to claims 22, 22, 23 or 24, wherein the liquid is ink.

23. A liquid ejecting recording apparatus for ejecting a liquid to record an image, comprising:

a liquid ejecting recording head that ejects the liquid for recording the image, including an element chip having a plurality of electrothermal transducer elements for producing thermal energy to create bubbles to eject the liquid, a temperature detecting element for detecting a temperature of said element chip, correcting means for correcting a variation of said temperature detecting element, said correcting means including said temperature detecting element and a correcting element, and a plurality of liquid passages, disposed on said element chip, corresponding to the electrothermal transducer elements, each said liquid passage having an opening for ejecting the liquid at an end; and

conveying means for conveying a recording medium for receiving the liquid ejected from the liquid ejecting recording head.

24. A liquid ejecting recording apparatus that ejects a liquid to record images, comprising:

a liquid ejecting recording head which ejects the liquid for recording the images, including an element chip having a plurality of electrothermal transducer elements for producing thermal energy to create bubbles to eject the liquid, a temperature detecting element for detecting a temperature of said element chip, correcting means for correcting a variation of said temperature detecting element, said correcting means including said temperature detecting element and a correcting element, and a plurality of liquid passages, disposed on said chip, corresponding to the electrothermal transducer elements and each said liquid passage having an opening for ejecting the liquid at an end; and

a driving signal supplying means for supplying a signal for driving the liquid ejecting head, to the liquid ejecting recording head.