Sensing sensor and sensing device

Patent metadata

Field	Value
Publication number	US-9625420-B2
Application number	US-201414497349-A
Country	US
Kind code	B2
Filing date	Sep 26, 2014
Priority date	Sep 30, 2013
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

A sensing sensor includes a wiring board, a piezoelectric resonator, a channel forming member, a channel, an effluent channel, a capillary member, and an absorbing member. The effluent channel is disposed at a downstream side of the channel. The effluent channel is configured to discharge the sample solution inside of the channel by capillarity. The capillary member is disposed at a downstream side of the effluent channel in contact with the sample solution flowing through an inside of the effluent channel. The capillary member is configured to cause the sample solution to flow through by the capillarity. The absorbing member is disposed at a downstream side of the capillary member. The absorbing member is configured to absorb the sample solution flowing through the capillary member.

First claim

What is claimed is:

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.

2. The sensing sensor according to claim 1 , wherein
the sensing sensor is configured such that when the sample solution inside of the effluent channel reaches the capillary member, the sample solution moves to the capillary member side at a speed faster than a moving speed of the sample solution flowing through the effluent channel.

3. The sensing sensor according to claim 1 , wherein
the effluent channel is constituted of a glass pipe.

4. The sensing sensor according to claim 1 , wherein
the capillary member is formed into a sheet shape.

5. The sensing sensor according to claim 4 , wherein
when viewed in a planar surface, the sheet-shaped capillary member has a shape where one end side is narrower than another end side.

6. The sensing sensor according to claim 1 , wherein
the injection port is constituted of a hole of a porous capillary member.

7. The sensing sensor according to claim 1 , further comprising:
a porous capillary member disposed between the channel and the effluent channel,
the porous capillary member being configured to cause the sample solution inside the channel to flow through the effluent channel by the capillarity.

8. A sensing device, comprising:
the sensing sensor according to claim 1 , and
the measuring apparatus.

Assignees

• Nihon Dempa Kogyo Co

Inventors

• Kukita Hiroyuki

Classifications

• G01N29/222

  Constructional or flow details for analysing fluids (optoacoustic fluid cells G01N29/2425) · CPC title

• G01N2291/0255

  (Bio)chemical reactions, e.g. on biosensors · CPC title

• G01N2291/0256

  Adsorption, desorption, surface mass change, e.g. on biosensors · CPC title

• G01N29/036 Primary

  by measuring frequency or resonance of acoustic waves · CPC title

• G01N29/022

  Fluid sensors based on microsensors, e.g. quartz crystal-microbalance [QCM], surface acoustic wave [SAW] devices, tuning forks, cantilevers, flexural plate wave [FPW] devices (microdevices per se B81B) · CPC title