Abstract:
PROBLEM TO BE SOLVED: To provide a microneedle array and a microneedle array production method capable of easily producing a shape with a high aspect ratio, a shape having a barb, and a complex shape with a mechanism such as a valve.SOLUTION: The microneedle array is formed by sticking a pair of half-split microneedle array elements each having a needle with a flow passage and a drug solution outlet in a half-split manner. The microneedle array production method includes: preparing a pair of half-split microneedle array elements each having a half-split needle with a flow passage and a drug solution outlet in the half split manner; and sticking the pair of microneedle array elements together to acquire a microneedle array.
Abstract:
PROBLEM TO BE SOLVED: To provide a snubber circuit for a switching power supply, capable of reducing switching negligence and simplifying a configuration and miniaturizing the unit. SOLUTION: The snubber circuit for a switching power supply controls surge voltage in turning off main switching elements (Q 1 , Q 2 ) connected to a primary winding (T 1-P ) of a transformer (T 1 ) of a switching power supply, thereby reducing switching loss of the main switching elements (Q 1 , Q 2 ), wherein a diode (D a1 ) and a capacitor (C a1 ) are connected in parallel to the primary winding (T 1-P ) of the transformer (T 1 ), a current is applied to the diode (D a1 ) by stored energy of the transformer (T 1 ) when the main switching elements (Q 1 , Q 2 ) are turned off, and the voltage of the capacitor (C a1 ) becomes gradually high to be inverted into (positive) and the rise of the voltage of the main switching elements (Q 1 , Q 2 ) becomes gradual. COPYRIGHT: (C)2010,JPO&INPIT