US Patent No. 10,126,268

SENSING SENSOR


Patent No. 10,126,268
Issue Date November 13, 2018
Title Sensing Sensor
Inventorship Wakako Shinobu, Saitama (JP)
Hiroyuki Kukita, Saitama (JP)
Shunichi Wakamatsu, Saitama (JP)
Assignee NIHON DEMPA KOGYO CO., LTD., Tokyo (JP)

Claim of US Patent No. 10,126,268

1. A sensing sensor, comprising:a common crystal element, having a first vibrating region and a second vibrating region that are constituted with respective excitation electrodes arranged on one surface side and another surface side of the common crystal element, the first vibrating region and the second vibrating region being laterally separated with one another;
an adsorbing film formed on a surface of the excitation electrode in the one surface side corresponding to one vibrating region of the first vibrating region and the second vibrating region, the adsorbing film adsorbing a sensing object in a sample solution;
a blocking layer arranged over a whole region other than a region where the adsorbing film is formed on the excitation electrode in the one surface side, the blocking layer blocking adsorption of the sensing object in the sample solution;
a wiring board including a connection terminal portion to connect the excitation electrode to a frequency measuring unit, the common crystal element being fixed to the wiring board such that the common crystal element forms a space in the another surface side of the first vibrating region and the second vibrating region; and
a channel forming member arranged to cover a region of the one surface side of the wiring board to form a channel that causes the sample solution to flow from a front end side toward a rear end side with the region, the region of the one surface side of the wiring board including the first vibrating region and the second vibrating region in the one surface side of the common crystal element, the channel including an injection port for injecting the sample solution in a front end side of the channel and a discharge port for discharging the sample solution from a rear end side of the channel, wherein
the adsorbing film is arranged such that the adsorbing film is located in a region including a central portion in a front-rear direction of the one vibrating region, and
assuming that a front end portion of the vibrating region is P1, the front end portion of the adsorbing film is P2, and the central portion of the vibrating region is C, the front end portion of the adsorbing film P2 satisfies a relational expression expressed as follows:
(a distance from C to P1)×0.4?(a distance from P1 to P2)?(a distance from C to P1)×0.8.