Component measurement device

Patent metadata

Field	Value
Publication number	US-9410884-B2
Application number	US-201113824017-A
Country	US
Kind code	B2
Filing date	Jul 19, 2011
Priority date	Sep 30, 2010
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

A component measurement device, namely a blood-glucose measurement device, that has a measurement unit that focuses measurement light on a test paper through an illumination lens and receives reflected light from the test paper. The blood-glucose measurement device measures blood components on the basis of results from detecting the reflected light. The illumination lens is provided in the measurement unit such that the focal point of the measurement light is beyond the test paper.

First claim

The invention claimed is:

1. A component measuring device including a measuring unit for applying measuring irradiation light through an irradiation light lens to an object to be measured and detecting reflected light from the object, a component in a liquid absorbed by the objected being measured based on the detected reflected light, wherein
the irradiation light lens is included in the measuring unit such that, with respect to a disposed position of the irradiation light lens, a focal position of the irradiation light is beyond a disposed position of the object, a distance between the object and the focal position is longer than a distance between the irradiation light lens and the object, and a focal length of the irradiation light lens is longer than the distance between the object and the focal position,
the measuring unit comprises:
a light emitter for emitting the irradiation light;
a light detector for detecting the reflected light;
a board for supporting the light emitter and the light detector;
a reflected light lens for focusing the reflected light onto the light detector; and
a photometric block having an irradiation light path for disposing the light emitter so as to face the irradiation light lens; the irradiation light path extending from a disposed position of the light emitter to the disposed position of the irradiation light lens, and a reflected light path extending from a disposed position of the reflected light lens to a disposed position of the light detector,
the photometric block further has a board placement region on its rear surface for placing the board, and the board placement region has a positioning projection extending through the board between the light emitter and the light detector for positioning the board, and configured to prevent light from directly propagating from the light emitter to the light detector.

2. The component measuring device according to claim 1 , wherein the distance from the light emitter to the irradiation light lens is substantially equal to a distance from the irradiation light lens to the object.

3. The component measuring device according to claim 1 , wherein the measuring unit comprises a plurality of the light emitters disposed so as to face the irradiation light lens.

4. The component measuring device according to claim 1 , wherein the irradiation light lens is integrally formed with the reflected light lens.

5. The component measuring device according to claim 1 , wherein the irradiation light path of the photometric block includes stray light guiding means for guiding stray light reflected by an inner peripheral surface of the irradiation light path out of a measuring range on the object through the irradiation light lens.

6. The component measuring device according to claim 5 , wherein the inner peripheral surface of the irradiation light path is of a hollow cylindrical shape, and the stray light guiding means is of a female screw configuration.

7. The component measuring device according to claim 6 , wherein the inner peripheral surface of the irradiation light path is of a tapered shape that is progressively smaller in diameter toward the irradiation light lens.

8. The component measuring device according to claim 5 , wherein the stray light guiding means comprises an alternately successive array of a ridge and a recess on the inner peripheral surface of the irradiation light path, and an angle of the surface of the ridge which faces the light emitter is set to prevent the stray light from being applied to the irradiation light lens.

9. A component measuring device including a measuring unit for applying measuring irradiation light through an irradiation light lens to an object to be measured and detecting reflected light from the object, a component in a liquid absorbed by the objected being measured based on the detected reflected light, wherein
the irradiation light lens is included in the measuring unit such that, with respect to a disposed position of the irradiation light lens, a focal position of the irradiation light is beyond a disposed position of the object, a distance between the object and the focal position is longer than a distance between the irradiation light lens and the object, and a distance between the irradiation light lens and the focal position is longer than the distance between the object and the focal position,
the measuring unit comprises:
a light emitter for emitting the irradiation light;
a light detector for detecting the reflected light;
a board for supporting the light emitter and the light detector;
a reflected light lens for focusing the reflected light onto the light detector; and
a photometric block having an irradiation light path for disposing the light emitter so as to face the irradiation light lens; the irradiation light path extending from a disposed position of the light emitter to the disposed position of the irradiation light lens, and a reflected light path extending from a disposed position of the reflected light lens to a disposed position of the light detector,
the photometric block further has a board placement region on its rear surface for placing the board, and the board placement region has a positioning projection extending through the board between the light emitter and the light detector for positioning the board, and configured to prevent light from directly propagating from the light emitter to the light detector.

10. The component measuring device according to claim 9 , wherein the distance from the light emitter to the irradiation light lens is substantially equal to a distance from the irradiation light lens to the object.

11. The component measuring device according to claim 9 , wherein the measuring unit comprises a plurality of the light emitters disposed so as to face the irradiation light lens.

12. The component measuring device according to claim 9 , wherein the irradiation light lens is integrally formed with the reflected light lens.

13. The component measuring device according to claim 9 , wherein the irradiation light path of the photometric block includes stray light guiding means for guiding stray light reflected by an inner peripheral surface of the irradiation light path out of a measuring range on the object through the irradiation light lens.

14. The component measuring device according to claim 13 , wherein the inner peripheral surface of the irradiation light path is of a hollow cylindrical shape, and the stray light guiding means is of a female screw configuration.

15. The component measuring device according to claim 14 , wherein the inner peripheral surface of the irradiation light path is of a tapered shape that is progressively smaller in diameter toward the irradiation light lens.

16. The component measuring device according to claim 13 , wherein the stray light guiding means comprises an alternately successive array of a ridge and a recess on the inner peripheral surface of the irradiation light path, and an angle of the surface of the ridge which faces the light emitter is set to prevent the stray light from being applied to the irradiation light lens.

Assignees

• Morita Takashi
• Nagasawa Yasushi
• Murayama Masami
• Nagaoka Yoshio
• Izumi Eiki
• Terumo Corp

Inventors

• Morita Takashi
• Nagasawa Yasushi
• Murayama Masami
• Nagaoka Yoshio
• Izumi Eiki

Classifications

• G01N21/31

  Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry {(G01N21/72 takes precedence)} · CPC title

• G01N21/8483 Primary

  Investigating reagent band (test-element handling not specific to a test method G01N33/4875; analytical elements specific to chemical analysis of biological material G01N33/52; autometer with reagent band G01N35/04) · CPC title

• B65H2513/40

  Movement · CPC title

• G01N21/0303

  Optical path conditioning in cuvettes, e.g. windows; adapted optical elements or systems; path modifying or adjustment (G01N21/031 - G01N21/15 take precedence) · CPC title

• G01N21/55 Primary

  Specular reflectivity · CPC title