# US 9,435,919 B2 · Prism and sensor chip

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- Number: US 9,435,919 B2
- Document ID: US9435919B2
- Status: Granted
- Kind: B2
- Application number: 14/387,864
- Filed: 2013-03-22
- Published: 2015-03-05
- Granted: 2016-09-06
- Earliest claimed: 2012-03-26
- Assignees: Konica Minolta, Inc.
- Applicants: Konica Minolta, Inc.
- Inventors: Hiroshi Umetsu; Yoshihiro Okumura; Takehiko Goshima
- Web page: https://patentgrep.com/patent/US9435919B2

## CPC

- G02B 5/04: Prisms
- G01N 21/648: {using evanescent coupling or surface plasmon coupling for the excitation of fluorescence}
- G02B 1/04: made of organic materials, e.g. plastics (G02B1/08 takes precedence)
- G02B 5/008: {Surface plasmon devices (diffractive gratings with a pitch less than or comparable to the wavelength G02B5/1809; surface plasmons in integrated optics G02B6/1226; optical analysis of materials by means of surface plasmons G01N21/553)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

A prism used in analysis utilizing surface plasmons is prism of a dielectric medium with a predetermined reflective index. Trapezoidal prism comprises an incident surface on which excitation light is incident from outside, a reflective surface at which the excitation light incident on the incident surface is reflected, an emission surface from which the excitation light reflected by the reflective surface is emitted; and an opposite surface which opposes the reflective surface. The opposite surface is a recessed sink-mark surface.

## Claims

### Claim 1

A prism of a dielectric medium used in analysis utilizing surface plasmons, comprising:
an incident surface on which excitation light is incident from outside;
a reflective surface at which the excitation light incident on the incident surface is reflected;
an emission surface from which the excitation light reflected by the reflective surface is emitted; and
an opposite surface which opposes the reflective surface, wherein the opposite surface is a recessed sink-mark surface;
wherein an injection molding product formed such that the position of a gate, which becomes an entrance port when resin is poured into a mold, is between the center of the thickness direction and the reflective surface; and
wherein the positions to which ejection pins used for releasing the mold are abutted are arranged in a region of the opposite surface other than a first projection region obtained by projecting a gate extension region obtained by extending the gate by the length of the injection molding product in the longitudinal direction of the injection molding product on the opposite surface, and other than a second projection region obtained by projecting a region where the excitation light passes through on the opposite surface.

### Claim 2 (depends on 1)

The prism according to claim 1, wherein
a P-polarization component maintenance rate of the excitation light in a section from the incident surface to the reflective surface is 90% or more.

### Claim 3 (depends on 2)

The prism according to claim 2, wherein
a distribution of the maintenance rate in a predetermined detection range is 95±5%.

### Claim 4 (depends on 1)

The prism according to claim 1, wherein
the injection molding product has resistance against an organic solvent, an acidic solution, and an alkaline solution, when it is evaluated according to the test method specified by JIS K7114.

### Claim 5 (depends on 1)

The prism according to claim 1, wherein
the hardness of the injection molding product is H or less, when it is evaluated according to the test method specified by JIS K5401.

### Claim 6 (depends on 1)

The prism according to claim 1, wherein
the water absorption of the dielectric is preferably 0.2% or less, when it is evaluated according to the test method specified by JIS K7209.

### Claim 7 (depends on 1)

The prism according to claim 1, wherein
the reflective index of the dielectric medium is 1.5 or more.

### Claim 8 (depends on 1)

The prism according to claim 1, wherein
in surface plasmon excitation fluorescence spectroscopy analysis using the surface plasmons, when a sample liquid of the detection lower limit value is supplied, the light quantity of the autofluorescence emits is less than the light quantity of the surface plasmon excitation fluorescence emitted from the sample liquid.

### Claim 9 (depends on 1)

The prism according to claim 1, wherein
the prism is formed using optical resin material having a photoelastic coefficient of 80*10−12 Pa−1 or less.

### Claim 10 (depends on 1)

A sensor chip, comprising:
the according to claim 1; and
a flow passage forming body in which a flow passage is formed.