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Carriage Tester

IP.com Disclosure Number: IPCOM000014325D
Original Publication Date: 2000-Feb-01
Included in the Prior Art Database: 2003-Jun-19

Publishing Venue



Disclosed is an inspection method to guarantee the quality of a carriage assembly (carriage ASM). The following inspection is enabled by the carriage tester. The gluing condition of a coil The polarity and output level of a PZT sensor on a carriage The inspection method is as follows. First, a carriage ASM is fixed to the fixture which has a shaft and a magnet such as a VCM upper yoke on a base. Sending a noise current into the coil, the transfer function (sensor output/coil current) can be measured from the output of the sensor attached to the carriage ASM or to the shaft on the fixture. By checking the peak gain, the peak frequency and the phase etc. from the transfer function, the gluing condition of the coil can be checked. If there is a PZT sensor (a piezoelectric sensor for active damping) on a carriage ASM, the polarity and the output level of the PZT sensor can be checked simultaneously. If there is no PZT sensor installed on a carriage ASM, an accelerometer, which is attached to the shaft on the fixture, can be used as the sensor, for example. So far, we had no way to check the inside condition of a carriage ASM itself quantitatively in mass production, because a large-scale equipment such as a laser vibrometer is needed for the inspection. But this inspection method is carried out very easily and quickly with a simple fixture and measuring equipment, so 100% inspection of a carriage ASM can be enabled in