| 摘要 |
PROBLEM TO BE SOLVED: To jet ink in a good manner and control as much as possible the operation of light and shade and also scratches in handwriting by specifying a clearance section formed between an interface shape stabilized body and an ink tank inner wall, in which a high viscosity fluid is interposed, and also specifying the contact angle formed between the high viscosity fluid and the ink tank inner wall. SOLUTION: Unless the volume variation equivalent to the consumption amount is formed immediately at the time of consumption of ink, the negative pressure in an ink tank is applied as the force for controlling the ink jetting. A clearance section 10 formed between an inner wall 2a of the ink tank 2 and a maximum diameter section 9a of an interface shape retaining component 9 is in the range of 0.1-0.4mm. The viscosity of the high viscosity fluid is in the range of 10,000-1,000,000cPs, and the contact angle with the inner wall 2 of the ink tank 2 is 30-45 deg.. Movement resistance is scarcely generated for the interface shape retaining component 9 moving following the reduction of ink by the above arrangement, and also the leakage of ink can be controlled as much as possible. |
