Visible light absorption element, and temperature visualization device and infrared ray visualization device equipped with same

Patent metadata

Field	Value
Publication number	US-10775243-B2
Application number	US-201715677428-A
Country	US
Kind code	B2
Filing date	Aug 15, 2017
Priority date	Feb 20, 2015
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

In accordance with heat received from a target object, a visible light absorption element 10 changes a frequency component of visible light to reflect or transmit. The visible light absorption element 10 possesses a resonance frequency included in a visible light frequency region. The visible light absorption element 10 absorbs visible light of the resonance frequency. The visible light absorption element 10 thermally deforms due to temperature change to thereby change the resonance frequency, and absorbs visible light of the changed resonance frequency.

First claim

The invention claimed is:

1. A visible light absorption element that, in accordance with heat received from a target object, changes a frequency component of visible light to reflect or transmit,
wherein the visible light absorption element possesses a resonance frequency included in a visible light frequency region, and resonates and absorbs visible light when the visible light of the resonance frequency enters on the element,
the visible light absorption element thermally deforms due to temperature change to thereby change the resonance frequency, and absorbs visible light of the changed resonance frequency,
the visible light absorption element includes two arm portions, wherein the two arm portions each include a base end and a distal end, and each of the arm portions extend from the respective base end to the distal end in a circumferential direction to form a ring shape,
each of the two arm portions protrudes from its respective base end into a space area so that an entirety of each of the two arm portions excluding the base end stays in the space area,
the distal ends of the two arm portions are spaced apart from each other in the circumferential direction, and
the visible light absorption element is formed of a material including a conductive material, and when visible light of the resonance frequency enters on the visible light absorption element, the visible light absorption element resonates with the visible light so that an electric current flows in the circumferential direction in the visible light absorption element.

2. The visible light absorption element according to claim 1 , wherein the visible light absorption element includes first and second layers superimposed to each other in a radial direction of the ring shape,
at least one of the first and second layers is formed of the conductive material, and
the first and second layers have different thermal expansion coefficients.

3. The visible light absorption element according to claim 1 , wherein the visible light absorption element has inductance depending on a dimension of the ring shape, and has capacitance depending on the space in the circumferential direction, and an LC circuit possessing the resonance frequency is configured by the inductance and the capacitance.

4. A visible light absorption element that, in accordance with heat received from a target object, changes a frequency component of visible light to reflect or transmit,
wherein the visible light absorption element possesses a resonance frequency included in a visible light frequency region, and resonates and absorbs visible light when the visible light of the resonance frequency enters on the element,
wherein the visible light absorption element thermally deforms due to temperature change to thereby change the resonance frequency, and absorbs visible light of the changed resonance frequency,
wherein the visible light absorption element comprises:
an inductor portion functioning as a coil having inductance; and
a capacitor portion functioning as a capacitor having capacitance,
wherein the inductor portion and the capacitor portion constitutes an LC circuit,
the LC circuit possesses the resonance frequency, and
thermal deformation of one or both of the inductor portion and the capacitor portion causes the resonance frequency to be changed, and
wherein the visible light absorption element comprises flat-plate-shaped portions arranged at an interval therebetween, the interval forms the capacitor portion, and each of the flat-plate-shaped portions forms the inductor portion and includes a base end extending in a direction perpendicular to a thickness direction of the flat-plate-shaped portion, and protrudes from the base end into a space area so that entirety of each of the flat-plate-shaped portions excluding the base end remains in the space area, or
the visible light absorption element comprises two L-shaped portions arranged at an interval therebetween and having an L-shaped section, the interval forms the capacitor portion, and each of the L-shaped portions forms the inductor portion, includes a base end, and extends from the base end to form the L-shaped section, and protrudes from the base end into a space area in such a way that entirety of each of the L-shaped portions excluding the base end stays in the space area, or
the visible light absorption element comprises two comb-shaped portions arranged at an interval therebetween, between a plurality of tooth portions in one of the comb-shaped portions, a tooth portion in the other of the comb-shaped portions is positioned, the interval forms the capacitor portion, and each of the comb-shaped portions forms the inductor portion, includes a base end, and extends from the base end to the tooth portion, and protrudes from the base end into a space area so that an entirety of each of the comb-shaped portions excluding the base end stays in the space area, or
the visible light absorption element comprises a helical-shaped portion, the helical-shaped portion forms the inductor portion, a helical interval of the helical-shaped portion forms the capacitor portion, and the helical-shaped portion includes a base end, and helically protrudes from the base end into a space area so that an entirety of the helical-shaped portion excluding the base end stays in the space area.

5. An infrared ray visualization device comprising:
a visible light absorption element that, in accordance with heat received from a target object, changes a frequency component of visible light to reflect or transmit;
an element supporting body in which a large number of the visible light absorption elements are integrated; and
at least one infrared ray absorbing portion thermally connected to the respective visible light absorption elements,
wherein the visible light absorption element possesses a resonance frequency included in a visible light frequency region, and resonates and absorbs visible light when the visible light of the resonance frequency enters on the element,
the visible light absorption element includes two arm portions, wherein the two arm portions each include a base end and a distal end, and each arm portion extends from the base end to the distal end in a circumferential direction to form a ring shape,
each of the two arm portions protrudes from the base end into a space area so that the entirety of each of the two arm portions excluding the base end stays in the space area,
the distal ends of the two arm portions are spaced apart from each other in the circumferential direction, and
the visible light absorption element thermally deforms due to temperature change to thereby change the resonance frequency, and absorbs visible light of the changed resonance frequency.

6. The infrared ray visualization device according to claim 5 , wherein a large number of the visible light absorption elements are integrally connected to the one infrared ray absorbing portion or a large number of the infrared ray absorbing portions.

7. An infrared ray visualization device comprising:
a visible light absorption element that, in accordance with heat received from a target object, changes a frequency component of visible light to reflect or transmit;
an element supporting body in which a large number of the visible light absorption elements are integrated; and
at least one infrared ray absorbing portion thermally connected to the respective visible light absorption elements,
wherein the visible light absorption element possesses a resonance frequency included in a visible light frequency region, and resonates and absorbs visible light when the visible light of the resonance frequency enters on the element,
the visible light absorption element thermally deforms due to temperature change to thereby change the

Assignees

• Riken

Inventors

• Tanaka Takuo

Classifications

• G02B5/208

  for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation · CPC title

• G01J1/02

  Details · CPC title

• G01J5/48

  Thermography; Techniques using wholly visual means · CPC title

• G01J5/44

  using change of resonant frequency, e.g. of piezoelectric crystals · CPC title

• G01J5/0853 Primary

  having infrared absorbers other than the usual absorber layers deposited on infrared detectors like bolometers, wherein the heat propagation between the absorber and the detecting element occurs within a solid · CPC title