Driving apparatus for analyzing apparatus
Disclosed is an analyzing apparatus including a first drive part ( 71 ) for rotating a turntable ( 101 ) on which an analyzing device is set, a second drive part ( 72 ) selectively engaged with the first drive part ( 71 ) to reciprocate the analyzing device, and a third drive part ( 73 ) for relatively moving the first drive part ( 71 ) and the second drive part ( 72 ) a position where the first and second drive parts are engaged with each other and a position where the first and second drive parts are not engaged with each other. Thus in the mixing and agitation of a small amount of fluid, necessary acceleration can be obtained even in a short time.
1. A driving apparatus for an analyzing apparatus in which an analyzing device is set, the analyzing device having a microchannel structure for transferring a sample liquid to a measuring chamber located in the microchannel structure by a centrifugal force generated by rotationally driving the analyzing device,
the driving apparatus comprising:
a turntable for holding the analyzing device in which the sample liquid has been injected;
a first drive part including magnetic material, the first drive part configured to rotationally drive the turntable, the first drive part also including at least two stationary magnetic sensors to detect a rotating magnetic field generated by the magnetic material;
a second drive part selectively engaged with the turntable to generate reciprocating vibrations on the turntable; and
a vibration detecting section configured to select an output signal having a largest amplitude from output signals of the magnetic sensors and calculate a vibration frequency from the selected output signal.
2. The driving apparatus for the analyzing apparatus according to claim 1 , wherein the first drive part has a rotary motor that is a three-phase brushless motor.
3. The driving apparatus for the analyzing apparatus according to claim 1 , wherein the vibration detecting section comprises:
filters configured to extract two of the output signals of the magnetic sensors and remove direct-current signals;
a first comparing section configured to compare amplitudes of the output signals of the filters to decide which of the amplitudes is larger, and store a decision result;
a multiplexer configured to select the signal having the largest amplitude from the output signals of the filters based on the decision result stored in the first comparing section;
a second comparing section configured to digitally convert the output signal selected by the multiplexer; and
a microcomputer configured to calculate a vibration frequency from an output signal of the second comparing section.
4. The driving apparatus for the analyzing apparatus according to claim 1 , wherein the vibration detecting section comprises:
filters configured to remove direct-current signals from the output signals of the at least two magnetic sensors;
a multiplexer configured to select one of output signals of the filters;
an analog-to-digital converter configured to digitally convert an output signal of the multiplexer; and
a microcomputer configured to calculate a vibration frequency from an output signal of the analog-to-digital converter.
5. A driving apparatus for an analyzing apparatus in which an analyzing device is set, the analyzing device having a microchannel structure for transferring a sample liquid to a measuring chamber located in the microchannel structure by a centrifugal force generated by rotationally driving the analyzing device, the driving apparatus comprising:
a turntable for holding the analyzing device in which the sample liquid has been injected;
a first drive part including magnetic material, the first drive part configured to rotationally drive the turntable, the first drive part also including at least two stationary magnetic sensors to detect a rotating magnetic field generated by the magnetic material;
a second drive part selectively engaged with the turntable to generate reciprocating vibrations on the turntable;
a vibration detecting section including
filters configured to extract the output signals of the magnetic sensors and remove direct-current signals;
a comparing section configured to compare the output signals of the filters; and
a microcomputer configured to calculate a vibration frequency from an output signal of the comparing section.