| 摘要 |
PROBLEM TO BE SOLVED: To provide a durability test method of droplet ejection head in which the lifetime of a product can be predicted at an early stage. SOLUTION: The durability test method of a droplet ejection head comprises a step for evaluating the initial droplet ejection performance of the droplet ejection head, a step for obtaining the storage times L<SB>1</SB>-L<SB>n</SB>at the respective storage temperatures T<SB>1</SB>-T<SB>n</SB>by filling n droplet ejection heads with test liquid, storing each droplet ejection head at the storage temperature T<SB>1</SB>-T<SB>n</SB>lower than the boiling point of the test liquid not lower than 303 K and ending storage at a moment in time when the droplet ejection performance of each droplet ejection head varies from the initial droplet ejection performance, and a step for determining relation (1): Ln(L)=a(1/T)+b between the storage temperature T and the storage time L based on the storage temperatures T<SB>1</SB>-T<SB>n</SB>and the storage times L<SB>1</SB>-L<SB>n</SB>, further determining the storage time L<SB>x</SB>at lower than 303 K and employing the storage time L<SB>x</SB>as the durable period of the droplet ejection head. COPYRIGHT: (C)2007,JPO&INPIT
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