US Patent No. 9,625,420

SENSING SENSOR AND SENSING DEVICE


Patent No. 9,625,420
Issue Date April 18, 2017
Title Sensing Sensor And Sensing Device
Inventorship Hiroyuki Kukita, Saitama (JP)
Assignee NIHON DEMPA KOGYO CO., LTD., Tokyo (JP)

Claim of US Patent No. 9,625,420

1. A sensing sensor, comprising:
a wiring board that includes a connecting terminal to be connected to a measuring apparatus for measuring an oscillation frequency,
and a depressed portion is formed at one surface side of the wiring board;

a piezoelectric resonator that includes a piezoelectric piece and an excitation electrode disposed at the piezoelectric piece,
the piezoelectric resonator covering the depressed portion, the piezoelectric resonator being secured to the wiring board
such that a vibrating region is opposed to the depressed portion, the excitation electrode being electrically connected to
the connecting terminal, the piezoelectric resonator including an adsorbing film configured to adsorb a sensing object in
a sample solution at one surface side of the piezoelectric piece;

a channel forming member disposed so as to cover a region at one surface side of the wiring board including the piezoelectric
resonator, the channel forming member including an injection port for a sample solution;

a channel formed between the wiring board and the channel forming member, the channel being configured to cause the sample
solution supplied to the injection port to flow through from a one end side to another end side at the one surface side of
the piezoelectric resonator;

an effluent channel disposed at a downstream side of the channel, the effluent channel being configured to discharge the sample
solution inside of the channel by capillarity;

a capillary member having a flat surface parallel to the effluent channel and disposed at a downstream side of the effluent
channel in contact with the sample solution flowing through an inside of the effluent channel, where one end side of the capillary
member projecting from a downstream end of the effluent channel into a portion of an opening of the effluent channel, the
capillary member being configured to cause the sample solution to flow through by the capillarity; and

an absorbing member disposed at a downstream side of the capillary member, the absorbing member being configured to absorb
the sample solution flowing through the capillary member.