CN117751396A

CN117751396A - Infrared safety system, infrared light emission control system and design unit

Info

Publication number: CN117751396A
Application number: CN202280053253.8A
Authority: CN
Inventors: 川口麻未; 沼田雄大; 松田祥一; 山本龙
Original assignee: Nitto Denko Corp
Current assignee: Nitto Denko Corp
Priority date: 2021-07-30
Filing date: 2022-06-30
Publication date: 2024-03-22

Abstract

The infrared ray security system is provided with: at least 1 detection unit including an optical laminate, and an infrared detection device configured to receive infrared rays via the optical laminate; and a safety system that operates based on an output from the infrared detection device. The value of L of the surface of the optical laminate measured by the SCE method is 4 or more, and the infrared detection device is disposed on the opposite side of the optical laminate from the surface so that the position of the infrared detection device is not specified.

Description

Infrared safety system, infrared light emission control system and design unit

Technical Field

The present invention relates to an infrared ray safety system, an infrared ray emission control system, and a design unit, and more particularly, to an infrared ray safety system, an infrared ray emission control system, and a design unit that can be provided so as not to be visually recognized from the outside.

Background

A security system using infrared rays (hereinafter referred to as an infrared security system) has been developed and put into practical use. For example, recognition techniques using infrared rays such as iris recognition, face recognition, and vein recognition are being put into practical use. The definition of infrared rays varies according to the technical field. In the present specification, the term "infrared ray" is defined to include at least light (electromagnetic wave) having a wavelength in a range of 760nm to 2000 nm. Further, "visible light" refers to light having a wavelength in the range of 400nm or more and less than 760 nm.

Patent document 1 discloses a door security system using two-dimensional information. In this door security system, infrared rays are used, and printing of two-dimensional information printed on an article is invisible under visible light, but is visible only when irradiated with infrared rays.

Patent document 2 discloses a traffic analysis system including image capturing terminals and an analysis server connected to each other via a network. The imaging terminal is disposed in a store or a station, for example. The analysis server analyzes the stream of people based on the captured image acquired by the imaging terminal.

Patent document 3 discloses an image capturing device capable of capturing a color still image or a color video of a subject in the dark. The image capturing apparatus includes an irradiation unit that irradiates infrared rays having different wavelength intensity distributions to a subject, a capturing unit that captures images of the subject based on the infrared rays having different wavelength intensity distributions reflected by the subject, and a color setting unit that sets color information for performing color matching on each of the images represented by the formed image information by different single colors, and forms image information representing each of the images. The image capturing device described in patent document 3 is used as a monitoring camera capable of night vision in a security system.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2011-1494204

Patent document 2: japanese patent application laid-open No. 2017-224148

Patent document 3: japanese patent application laid-open No. 2011-50049

Disclosure of Invention

Problems to be solved by the invention

The conventional monitoring cameras disclosed in patent documents 1, 2, and 3 are provided at positions that can be recognized by a person. Therefore, there are the following cases: the unlocking risk is generated by the identification of the unlocking system position by the third party, or the original actions or actions of the person are changed by the knowledge of the existence of the monitoring camera, so that the anti-theft problem is generated. As a result, there is a possibility that a system with high security cannot be realized.

Therefore, from the viewpoint of improving safety, for example, it is considered that a structure hidden in a building is arranged so that a monitoring camera or a light source emitting infrared rays cannot be visually recognized from the outside. In this case, an infrared ray transmitting filter can be used to make the presence of the monitoring camera or the light source unnoticeable.

However, in the conventional infrared transmission filter, the main stream is black to absorb visible light. Therefore, there is a problem in that it is difficult to adjust the color of the peripheral portion where the monitoring camera is disposed and the color of the infrared ray transmitting filter surface to such an extent that they cannot be distinguished from each other, and thus the design is low. In this case, even if the monitoring camera is hidden by the infrared light transmitting filter, the position of the monitoring camera may be easily specified, and the problem that may occur in theft prevention is not eliminated.

The present invention has been made to solve at least one of the above problems, and an object of the present invention is to provide an infrared security system capable of enhancing a security level, or to provide an infrared security system or a design unit capable of exhibiting excellent design properties.

Means for solving the problems

According to an embodiment of the present invention, a solution means shown in the following items is provided.

[ item 1]

An infrared ray safety system is provided with:

at least 1 detection unit including an optical laminate, and an infrared detection device configured to receive infrared rays via the optical laminate; and

a safety system which operates based on an output from the infrared detection device,

the value of L of the surface of the optical laminate measured by a spectrocolorimeter using an SCE (specular reflection light excluded) method is 4 or more,

the infrared detection device is disposed on the opposite side of the optical laminate from the surface so that the position of the infrared detection device is not specified.

[ item 2]

The infrared security system according to item 1, wherein when the color of the surface of the periphery of the portion where the at least 1 detection unit is disposed is referred to as a peripheral color and the color of the surface of the at least 1 detection unit is referred to as a detection portion color, both the peripheral color and the detection portion color are not black, and a color difference between the peripheral color and the detection portion color when measured by SCE is 3 or less.

[ item 3]

The infrared security system as set forth in item 2, wherein said security system is configured to,

generating time-series data representing movement of the 1 or more subjects based on subject signals generated when the infrared detection device receives infrared rays emitted from the light emitting device to the 1 or more subjects via the optical laminate and reflected by the 1 or more subjects,

and analyzing movement of the 1 or more subjects based on the time-series data.

[ item 4]

The infrared security system as set forth in item 1, wherein when the design of the surface of the periphery of the portion where the at least 1 detection unit is disposed is referred to as a peripheral design and the design of the surface of the optical laminate is referred to as a detection portion design,

the detector design is similar to the perimeter design,

the security system operates with reference to a blank signal that is generated when the infrared detection device receives infrared light for reference via the optical laminate, and does not include information of the subject.

[ item 5]

The infrared security system as set forth in item 4, wherein said security system acquires said blank signal every fixed period.

[ item 6]

The infrared security system as set forth in item 4 or 5, wherein said peripheral design and said detection portion design each include a pattern,

the infrared security system further comprises a storage device for storing the blank signal unique to the pattern.

[ item 7]

The infrared security system according to any one of items 4 to 6, wherein the security system operates based on a difference between an object signal generated when the infrared detection device receives infrared rays emitted from a light emitting device to 1 or more objects and reflected by the 1 or more objects via the optical laminate, and the blank signal.

[ item 8]

The infrared security system as set forth in item 7, wherein said security system is configured to,

generating time-series data representing movement of the 1 or more subjects based on the difference between the subject signal and the blank signal,

and analyzing movement of the 1 or more subjects based on the time-series data.

[ item 9]

The infrared security system as described in any one of items 3, 7, and 8, wherein the at least 1 detection unit includes the light emitting device that emits infrared light to the outside via the optical laminate.

[ item 10]

The infrared security system of any one of items 1 to 9, wherein the at least 1 detection unit comprises a plurality of detection units.

[ item 11]

An infrared ray safety system is provided with:

when the design of the surface of the periphery of the portion where the at least 1 detection unit is arranged is referred to as a peripheral design and the design of the surface of the optical laminate is referred to as a detection portion design,

the detector design is similar to the perimeter design,

[ item 12]

An infrared light emission control system is provided with:

a light source unit including an optical laminate, and a light emitting device configured to emit infrared rays to the outside via the optical laminate; and

a light-emitting control system for controlling the action of the light-emitting device,

When the color of the surface of the periphery of the portion where the light source unit is arranged is referred to as a peripheral color and the color of the surface of the light source unit is referred to as a detection portion color, both the peripheral color and the detection portion color are not black, and the color difference between the peripheral color and the detection portion color when measured by SCE is 3 or less.

[ item 13]

The infrared security system according to any one of items 1 to 11, wherein the infrared detection device is configured to capture an image of an object based on each of 2 or more different wavelength ranges of infrared rays included in infrared rays reflected by the object, and generate image information indicating each of the images.

[ item 14]

The infrared security system as set forth in any one of items 1 to 11 and 13, wherein the optical laminate has a linear transmittance in a wavelength region of visible light of 20% or less and a total light transmittance of 40% or less.

[ item 15]

The infrared security system as set forth in item 14, wherein the optical laminate includes a visible light scattering layer having a linear transmittance of 60% or more with respect to light having at least a part of wavelengths in a wavelength range of 760nm to 2000 nm.

[ item 16]

The infrared security system as described in item 15, wherein the optical laminate has a linear transmittance of 40% or more for light in a wavelength range of 760nm to 2000 nm.

[ item 17]

The infrared security system as set forth in item 16, wherein the optical laminate has a diffuse transmittance of less than 30% in the entire wavelength range of 760nm to 2000 nm.

[ item 18]

The infrared security system as set forth in any one of items 14 to 17, wherein the optical laminate has a visible light scattering layer in which fine particles serving as a light scattering body are dispersed in a matrix.

[ project 19]

The infrared security system of item 18, wherein the particulates comprise at least colloidal amorphous aggregates.

[ item 20]

The infrared security system as set forth in item 18 or 19, wherein the transmittance curve of the visible light wavelength region of the visible light scattering layer has a curve portion in which the linear transmittance monotonically decreases from the long wavelength side toward the short wavelength side, and the curve portion is shifted toward the long wavelength side as the incident angle increases.

[ item 21]

The infrared security system of any one of items 18 to 20, wherein the optical laminate has a surface protection layer on a surface.

[ item 22]

The infrared security system of any one of claims 18 to 21, wherein the optical laminate has a design layer.

[ project 23]

The infrared security system of any one of claims 18 to 22, wherein the optical laminate has a substrate layer.

[ item 24]

The design unit is provided with:

1 or more detection units including an optical laminate, and an infrared detection device configured to receive infrared rays via the optical laminate; and

a housing part for housing the 1 or more detection units,

the outer surface of the housing portion includes the surface of the optical laminate provided for each of the 1 or more detection units,

the value of L of the surface of the optical laminate measured by the SCE method is 4 or more,

[ project 25]

The design unit described in item 24, wherein when the color of the outer surface is referred to as a peripheral color and the color of the surface of the optical laminate is referred to as a detection portion color, both the peripheral color and the detection portion color are not black, and a color difference between the peripheral color and the detection portion color when measured by SCE is 3 or less.

[ item 26]

The design unit according to item 24, wherein a single pattern is attached to the outer surface and the surface of the optical laminate,

the optical laminate provided in each of the 1 or more detection units is disposed at an arbitrary portion of the single pattern, and each of the 1 or more detection units is hidden on the back side of the optical laminate.

[ project 27]

The design unit according to item 24, wherein a design including a plurality of regions divided by the visually recognized boundary is added to the outer surface and the surface of the optical laminate,

the optical laminate provided for each of the 1 or more detection units is disposed in a different one of the plurality of regions, each of the 1 or more detection units is hidden on the back side of the optical laminate,

each of the plurality of regions has any color or pattern.

[ project 28]

An infrared ray safety system is provided with:

the design unit according to any one of items 24 to 27; and

a safety system operated based on an output from the infrared detection device,

the infrared detection device cannot be visually recognized from the outside.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the embodiment of the invention, an infrared safety system or a design unit capable of exerting excellent design is provided.

Drawings

Fig. 1 is a diagram schematically showing a configuration example of an infrared ray security system.

Fig. 2 is a block diagram illustrating a hardware configuration of the detection unit.

Fig. 3 is a block diagram illustrating a schematic hardware configuration of the security system.

Fig. 4 is a diagram for explaining a configuration example of a detection unit provided in the interior of a wall in a building.

Fig. 5 is a schematic cross-sectional view of the optical laminate.

Fig. 6 is a schematic cross-sectional view of a visible light scattering layer.

Fig. 7 is a view showing a cross-sectional TEM image of the visible light scattering layer.

Fig. 8 is a graph obtained by normalizing the graph to the maximum transmittance, and is a graph showing the incident angle dependence of the linear transmittance spectrum of the visible light scattering layer.

Fig. 9A is a schematic diagram showing an example of design of a continuous pattern.

Fig. 9B is a schematic diagram showing another example of design of the continuous pattern.

Fig. 9C is a schematic diagram showing an example of a tile-like design.

Fig. 9D is a schematic diagram showing other examples of tile-like designs.

Fig. 10 is a diagram for explaining an example of managing locking of a conference room by a gesture.

Fig. 11 is a schematic diagram showing a case where a plurality of detection units are provided inside a wall.

Fig. 12 is a diagram for explaining an example in which the detection unit is provided inside a wall and 1 or more light source units are arranged in a ceiling so that the 1 or more light source units cannot be seen from the outside.

Fig. 13 is a block diagram illustrating processing performed by the processor in the case where the security system performs movement tracking of the moving body by a functional block unit.

Fig. 14 is a flowchart showing an example of a processing procedure for performing movement tracking of a moving body.

Fig. 15 is a block diagram illustrating processing performed by a processor in the security system based on example 1 by a functional block unit.

Fig. 16 is a schematic view showing a case where the detection unit is provided inside a wall, and further an input device is provided on the wall.

Fig. 17 is a block diagram illustrating processing performed by a processor in the security system based on example 2 by a functional block unit.

Fig. 18 is a block diagram illustrating processing performed by a processor in the security system based on example 3 by a functional block unit.

Detailed Description

An infrared security system according to an embodiment of the present invention is described below with reference to the drawings. The infrared security system according to the embodiment of the present invention is not limited to the system illustrated below.

An infrared security system according to an embodiment of the present invention includes: at least 1 detection unit including an optical laminate, and an infrared detection device configured to receive infrared rays via the optical laminate; and a safety system that operates based on an output from the infrared detection device. At least 1 of the detection units may be provided with a light emitting device that emits infrared rays to the outside through the optical laminate.

The optical laminate has a visible light scattering layer in which fine particles serving as a light scattering body are dispersed in a matrix, and the visible light scattering layer includes a visible light scattering layer having a linear transmittance of 60% or more for light having at least a part of wavelengths in a wavelength range of 760nm to 2000 nm. For example, a visible light scattering layer having a linear transmittance of 60% or more with respect to light having wavelengths of 950nm and 1550nm can be obtained. The wavelength range of light (near infrared ray) having a linear transmittance of 60% or more in the visible light scattering layer is, for example, preferably 810nm to 1700nm, more preferably 840nm to 1650 nm. Here, it is preferable that both the matrix and the fine particles are transparent to visible light (hereinafter, simply referred to as "transparent").

Further, the visible light scattering layer may be characterized by the following optical characteristics: the transmittance curve in the wavelength region of visible light has a curve portion in which the linear transmittance monotonically decreases from the long wavelength side to the short wavelength side, and the curve portion shifts toward the long wavelength side as the incident angle increases.

In the infrared security system according to the embodiment of the present invention, the value of L of the surface of the optical laminate measured by SCE using a spectrocolorimeter is 4 or more, and the infrared detection device is disposed on the opposite side of the optical laminate from the surface so that the position of the infrared detection device is not specified. In the embodiment of the present invention, the visible light scattering layer may be gray, for example, when L is 4 or more, or white, for example, when L is 20 or more.

In the infrared ray safety system according to one aspect of the present invention, when the color of the surface of the periphery of the portion where at least 1 detection unit is disposed is referred to as a peripheral color, and the color of the surface of at least 1 detection unit is referred to as a detection unit color, neither the peripheral color nor the detection unit color is black, and the color difference between the peripheral color and the detection unit color when measured by SCE is 3 or less. Here, the color difference is 3 or less, which means that the values of a and b of the peripheral surface in the color system are respectively defined as a ₁ *、b ₁ * And the values of a and b of the surface of the detection unit in the color system of Lab are respectively set as a ₂ *、b ₂ * In this case, the condition of the numerical expression of the number 1 is satisfied.

[ number 1]

|a ₁ *－a ₂ * I is less than or equal to 3, and I b ₁ *－b ₂ *|≤3

Another infrared security system according to another embodiment of the present invention is an infrared security system for managing unlocking of a lock. The security system may be configured to generate time-series data indicating movement of the object based on the object signal generated when the infrared detection device receives the infrared light emitted from the light emitting device to the object via the optical laminate and reflected by the object, and unlock the lock based on the time-series data. Alternatively, the security system may be configured to calculate a relative positional relationship of the subject with respect to the infrared detection device, and unlock the lock based on the calculated positional relationship. The subject in the embodiment of the present invention is a person. However, the subject may include not only a human but also a robot, an animal, or the like.

The design unit according to one embodiment of the present invention includes: 1 or more detection units including an optical laminate, and an infrared detection device configured to receive infrared rays via the optical laminate; and a housing portion housing 1 or more detection units. The housing portion has a structure that can house the detection unit so as not to be visible from the outside, such as a wall, a pillar, a floor, or a ceiling of a building. The outer surface of the housing portion is positioned in the same plane or curved surface as the surface of the optical laminate provided for each of the 1 or more detection units, and the value of L of the surface of the optical laminate measured by SCE method using a spectrocolorimeter is 4 or more. The infrared detection device is disposed on the opposite side of the optical laminate from the surface so that the position of the infrared detection device is not specified. By combining the design means with the safety system, an infrared safety system that can exhibit excellent design properties can be provided.

A configuration example of an infrared security system in an exemplary embodiment of the present invention will be described with reference to fig. 1.

Fig. 1 schematically shows an example of the configuration of an infrared security system 300 in an exemplary embodiment of the present invention. The infrared security system 300 may be provided with at least 1 detection unit 100, and a security system 200200 that operates based on an output from each detection unit 100. Each detection unit 100 is connected to the security system 200 via a wired or wireless network 70. The infrared security system 300 may further include 1 or more edge computers from the viewpoint of reduction of communication delay and dispersion of network load.

Fig. 2 shows a block diagram of an exemplary hardware configuration of the detection unit 100. The detection unit 100 includes an infrared detection device 120 configured to receive infrared rays via the optical laminate. The detection unit 100 illustrated in fig. 2 includes a light emitting device 130 that emits infrared rays to the outside through an optical laminate. However, as will be described later, the light emitting device 130 may be provided outside the detection unit 100.

The infrared detection device 120 includes an optical system 121, an infrared sensor 122, a signal processing circuit 123, and a communication device 124. The infrared detection device 120 may be an infrared camera corresponding to an analog high-definition standard such as an AHD, HD-CVI, or HD-TVI method.

The optical system 121 may include, for example, 1 or more lenses formed of zinc sulfide or chalcogenide glass. Examples of the infrared sensor 122 include an nGaAs sensor, or an InGaAs/GaAsSb sensor, an InSb sensor, or an equivalent type sensor.

An example of the signal processing circuit 123 is a DSP (Digital Signal Processor ). The signal processing circuit 123 may apply compression processing according to, for example, the h.264 or h.265 standard to the output data (video data) output from the infrared sensor 122 to generate compressed data, for example.

The communication device 124 is a communication module for communicating with the security system 200 via the network 70. For example, the communication device 124 can perform wired communication according to a communication standard such as Camera Link (Camera Link), IEEE1394 (registered trademark), or ethernet (registered trademark). The communication device 124 can perform wireless communication according to Wi-Fi standard using a frequency of 2.4GHz band or 5.0GHz band, for example.

The light emitting device 130 includes 1 or more light emitting elements 131 emitting infrared rays, and a driving device 132. Examples of the light emitting element 131 include a light emitting diode or a semiconductor laser element. The driving device 132 supplies a driving signal to the light emitting element 131, for example, in accordance with a control signal output from the safety system 200.

Fig. 3 shows a block diagram of a schematic hardware configuration example of the security system 200.

The security system 200 in an embodiment of the present invention is a server computer. However, the security system 200 may also be, for example, a stationary computer, a laptop computer, an edge computing server, or an edge IoT server. The security system 200 may be provided at a location separate from the detection unit 100, for example, a management center in a building where the detection unit 100 is provided, or a building of a security company that performs security management in general.

The security system 200 includes, for example, a processor 210, a ROM (Read Only Memory) 220, a RAM (Random Access Memory ) 230, a storage device 240, and a communication device 250. These components are communicatively connected to each other via a bus. Software (or firmware) for causing the processor 210 to perform at least 1 process may be installed on the ROM220. Such software may be recorded on a computer-readable recording medium such as an optical disk, sold as a software package, or provided to a user via the network 70.

The processor 210 is a semiconductor integrated circuit and includes a Central Processing Unit (CPU). The processor 210 may be implemented by a microprocessor or microcontroller. The processor 210 successively executes computer programs stored in the ROM220 describing a command group for executing at least 1 process, thereby realizing a desired process.

The security system 200 may include, in addition to the processor 210, an FPGA (Field Programmable Gate Array ) on which a CPU is mounted, a GPU (Graphics Processing Unit ), an ASIC (Application Specific Integrated Circuit, application specific integrated circuit), an ASSP (Application Specific Standard Product ), or a combination of 2 or more circuits selected from these circuits, or may include the above circuits instead of the processor 210.

ROM220 is, for example, a writable memory (e.g., a PROM, an erasable memory (e.g., a flash memory), or a read-only memory). ROM220 stores a program that controls the operation of processor 210. ROM220 need not be a single recording medium but may be an aggregate of multiple recording media, or a portion of the aggregate may be a removable memory.

The RAM230 provides a work area for temporarily expanding a control program stored in the ROM220 at the time of startup. The RAM230 need not be a single recording medium, but may be a collection of a plurality of recording media.

The storage device 240 mainly functions as a storage of a database. The storage device 240 is, for example, a magnetic storage device or a semiconductor storage device. An example of a magnetic storage device is a Hard Disk Drive (HDD). An example of a semiconductor memory device is a Solid State Disk (SSD). However, the storage device 240 may be an external storage device connected to the server via the network 70. The storage device 240 may store video stream data output from the detection unit 100, for example.

The communication device 250 is a communication module for communicating with the detection unit 100 via the network 70. As with the communication device 124, the communication device 250 can perform wired communication according to a communication standard such as Camera Link (Camera Link), IEEE1394 (registered trademark), or ethernet (registered trademark), for example. The communication device 250 can perform wireless communication according to Wi-Fi standard using a frequency of 2.4GHz band or 5.0GHz band, for example.

Fig. 4 shows a configuration example of the detection unit 100 provided inside the wall 501 in the building. Fig. 4 illustrates an entrance of a conference room in a room provided with a door 500.

The detection unit 100 is provided inside a space S of the wall 501 that is adjacent to the door 500, the space S being provided at a position close to the door handle, so as not to be visible from the outside, in other words, so as not to determine the position of the detection unit 100. The optical laminate 110 is disposed at a position crossing the infrared rays emitted from the light emitting device 130 to cover the opening of the space S of the wall 501. According to such a configuration, the infrared detection device 120 and the light emitting device 130 can be hidden by the optical laminate 110. The optical laminate 110 has a longitudinal dimension and a transverse dimension of, for example, 10cm to 15 cm. The detection unit 100 may be disposed at a height of 100cm to 170cm, for example, from the floor. The optical laminate 110 may be disposed not only in the opening of the space S but also on one surface of the wall 501 including the opening.

Next, the structure and optical characteristics of the optical laminate 110 will be described with reference to fig. 5 to 8.

Fig. 5 shows a schematic cross-sectional view of the optical laminate 110. The optical laminate 110 according to the embodiment of the present invention includes a visible light scattering layer 110A, a base material layer 110B supporting the visible light scattering layer 110A, and a design layer 110C disposed on the visible light scattering layer 110A.

The base material layer 110B has mechanical strength as a cover (cover) of the detection unit 100, and has high infrared transmittance. The base material layer 110B may be formed of a transparent plastic such as an acrylic resin. In order to improve the visibility suppressing ability under visible light, the base material layer 110B may be black or may include a dielectric multilayer film such as a mirror surface. The thickness of the base material layer 110B is, for example, about 2 μm or more and about 10mm or less.

The visible light scattering layer 110A of the embodiment of the present invention is achromatic color other than black. If L is 4 or more measured in SCE on CIE1976 color space, it is considered to be an achromatic color other than black. The visible light scattering layer 110A may be white, for example. Herein, white means that x and y coordinates on the CIE1931 chromaticity diagram when the standard light is set as the D65 light source are within the ranges of 0.25.ltoreq.x.ltoreq.0.40 and 0.25.ltoreq.y.ltoreq.0.40, respectively. Of course, the closer x=0.333 and y=0.333, the higher the whiteness, preferably 0.28.ltoreq.x.ltoreq.0.37, 0.28.ltoreq.y.ltoreq.0.37, more preferably 0.30.ltoreq.x.ltoreq.0.35, and 0.30.ltoreq.y.ltoreq.0.35. Further, L measured in SCE on CIE1976 color space is preferably 20 or more, more preferably 40 or more, further preferably 50 or more, and particularly preferably 60 or more. As long as L is 20 or more, it is considered to be substantially white. The upper limit value of L is, for example, 100. For example, measurement by the SCE method can be performed using a spectrophotometer CM-2600-D (manufactured by Konikoku Meida Co., ltd.).

Fig. 6 shows a schematic cross-sectional view of the visible light scattering layer 110A. The optical laminate 110 includes a visible light scattering layer 110A, and the visible light scattering layer 110A is formed by dispersing fine particles 14 serving as a light scattering body in a matrix 12. The visible light scattering layer 110A of the embodiment of the present invention includes a substrate 12 transparent to visible light and transparent fine particles 14 dispersed in the transparent substrate 12. The particles 14 act as light scattering bodies. The particulates 14 may, for example, constitute at least colloidal amorphous aggregates. In this case, other particles that do not disturb the colloidal amorphous aggregates constituted by the particles 14 may be contained.

As schematically shown in fig. 6, the visible light scattering layer 110A has a substantially flat surface. Here, the substantially flat surface means a surface having no concave-convex structure of such a size as to scatter (diffract) or diffusely reflect visible light or infrared light. The visible light scattering layer 110A does not contain a cholesteric liquid crystal (cholesterol liquid crystal exhibiting a cholesteric phase is broadly included, and is a high molecular liquid crystal, a low molecular liquid crystal, a liquid crystal mixture thereof, and a liquid crystal obtained by mixing a crosslinking agent with these liquid crystal materials, crosslinking, and the like, and curing the mixture). The visible light scattering layer 110A is, for example, film-shaped, but is not limited to this.

The transparent particles 14 are, for example, silica particles. As the silica fine particles, silica fine particles synthesized by the Stober method can be used, for example. As the fine particles, inorganic fine particles other than silica fine particles may be used, and resin fine particles may be used. As the resin fine particles, for example, fine particles composed of at least 1 kind of polystyrene and polymethyl methacrylate are preferable, and further fine particles composed of crosslinked polystyrene, crosslinked polymethyl methacrylate or crosslinked styrene-methyl methacrylate copolymer are preferable. As such particles, for example, polystyrene particles or polymethyl methacrylate particles synthesized by emulsion polymerization can be suitably used. In addition, hollow silica particles containing air and hollow resin particles can also be used. Further, the fine particles formed of an inorganic material have the advantage of excellent heat resistance and light resistance. The volume fraction of the whole particles (including the matrix and the particles) is preferably 6% to 60%, more preferably 20% to 50%, and still more preferably 20% to 40%. The transparent particles 14 may also be optically isotropic.

Examples of the substrate 12 include, but are not limited to, acrylic resins (e.g., polymethyl methacrylate, polymethyl acrylate), polycarbonates, polyesters, poly (diethylene glycol bisallyl carbonate)), polyurethanes, epoxy resins, and polyimides. The substrate 12 is preferably formed using a curable resin (thermosetting or photocurable), and is preferably formed using a photocurable resin from the viewpoint of mass productivity. As the photocurable resin, various (meth) acrylates can be used. The (meth) acrylate is preferably a (meth) acrylate containing 2 or 3 functions or more. In addition, the substrate 12 is preferably optically isotropic. When a curable resin containing a polyfunctional monomer is used, the substrate 12 having a crosslinked structure can be obtained, and therefore heat resistance and light resistance can be improved.

The visible light scattering layer 110A of the substrate 12 formed of a resin material may be film-like having flexibility. The thickness of the visible light scattering layer 110A is, for example, 10 μm or more and 10mm or less. The visible light scattering layer 110A has a thickness of, for example, 10 μm or more and 1mm or less, and further 10 μm or more and 500 μm or less, so that flexibility can be remarkably exhibited.

In the case of using silica fine particles having a hydrophilic surface as the fine particles, the fine particles are preferably formed by, for example, photocuring a hydrophilic monomer. Examples of the hydrophilic monomer include: polyethylene glycol (meth) acrylate, polyethylene glycol di (meth) acrylate, polyethylene glycol tri (meth) acrylate, polypropylene glycol di (meth) acrylate, polypropylene glycol tri (meth) acrylate, 2-hydroxyethyl (meth) acrylate, or 2-hydroxypropyl (meth) acrylate, acrylamide, methylenebisacrylamide, ethoxylated bisphenol a di (meth) acrylate, but are not limited thereto. In addition, 1 kind of these monomers may be used alone, or 2 or more kinds may be used in combination. Of course, the 2 or more monomers may contain a monofunctional monomer and a polyfunctional monomer, or may contain 2 or more polyfunctional monomers.

These monomers can be appropriately subjected to a curing reaction using a photopolymerization initiator. Examples of the photopolymerization initiator include: benzoin ethers, benzophenones, anthraquinones, thioxane, ketals, acetophenones and other carbonyl compounds, disulfide compounds, dithiocarbamates and other sulfur compounds, benzoyl peroxide and other organic peroxides, azo compounds, transition metal complexes, polysilane compounds, dye sensitizers and the like. The amount of the additive is preferably 0.05 to 3 parts by mass, more preferably 0.05 to 1 part by mass, based on 100 parts by mass of the mixture of the fine particles and the monomer.

The refractive index of the matrix for visible light is set to n _M And the refractive index of the particles is set to n _P When, |n _M －n _P The | (hereinafter, sometimes simply referred to as refractive index difference) is preferably 0.01 or more and preferably 0.6 or less, more preferably 0.03 or more and still more preferably 0.11 or less. If the refractive index difference is less than 0.03, the scattering intensity becomes weak, and it becomes difficult to obtain desired optical characteristics. If the refractive index difference exceeds 0.11, the linear transmittance of the infrared ray may be reduced. In addition, for example, when the refractive index difference is set to 0.6 by using zirconia fine particles (refractive index 2.13) and an acrylic resin, the linear transmittance of infrared rays can be adjusted by reducing the thickness. In this way, the linear transmittance of infrared rays can be adjusted by controlling the thickness and refractive index difference of the visible light scattering layer, for example. Further, depending on the application, the filter may be used in a superimposed manner with an infrared ray absorbing filter. The refractive index for visible light can be represented by, for example, a refractive index for 546nm light. Here, unless otherwise specified, the refractive index refers to the refractive index for light of 546 nm.

A cross-sectional TEM image of the visible light scattering layer 110A is shown in fig. 7. In the TEM image, white circles are silica particles, and black circles are traces of the silica particles after falling off. As shown in the cross-sectional TEM image of the visible light scattering layer 110A, the silica particles are substantially uniformly dispersed.

Fig. 8 is a graph obtained by normalizing the graph to the maximum transmittance, and is a graph showing the incident angle dependence of the linear transmittance spectrum of the visible light scattering layer 110A. The transmittance curve of the visible light scattering layer 110A shown in fig. 8 is observed, and the linear transmittance shifts (about 50 nm) toward the long wavelength side as the incident angle increases from the curve portion where the visible light is monotonously increased toward the infrared ray. In other words, the linear transmittance is shifted toward the long wavelength side with an increase in the incident angle from the curve portion where the infrared ray monotonically decreases toward the visible light. This characteristic angle of incidence dependence is thought to be due to the silica particles contained in the optical film constituting colloidal amorphous aggregates. Further, details of the structure or optical characteristics of the visible light scattering layer 110A and the manufacturing method are described in international application PCT/JP2021/010413 by the present applicant. The disclosure of International application PCT/JP2021/010413 is incorporated by reference in its entirety into this specification.

By controlling the thickness of the visible light scattering layer 110A, optical characteristics such as infrared linear transmittance, visible light linear transmittance, infrared diffuse transmittance, and visible light diffuse reflectance can be adjusted. Further, by providing a semi-reflective layer (sometimes also referred to as a "visible light transmissive reflective layer") that partially reflects visible light on the surface of the visible light scattering layer 110A in addition to the visible light scattering layer 110A, the visible light straight transmittance, the visible light total light transmittance, and/or the visible light total light reflectance can be adjusted. In this case, a semi-reflective layer having polarization selectivity may be used.

The semi-reflective layer (visible light transmissive reflective layer) that partially reflects visible light has a transmission characteristic and a reflection characteristic that reflect a part of incident visible light and transmit the remaining visible light. The transmittance of visible light of the semi-reflective layer is preferably 10% to 70%, more preferably 15% to 65%, and still more preferably 20% to 60%. The reflectance of visible light of the semi-reflective layer is preferably 30% or more, more preferably 40% or more, and still more preferably 45% or more. The infrared ray has a transmittance characteristic of preferably 10% or more, more preferably 15% or more, and still more preferably 20% or more. As the semi-reflective layer, for example, a half mirror, a reflective polarizing element, a louver film, or the like can be used.

As the half mirror, for example, a multilayer body formed by laminating 2 or more dielectric films having different refractive indices can be used. Such a half mirror is preferably metallic. Examples of the material for forming the dielectric film include metal oxides, metal nitrides, metal fluorides, and thermoplastic resins (for example, polyethylene terephthalate (PET)). The multilayered layer of dielectric films reflects a part of incident light at the interface by the refractive index difference of the multilayered dielectric films. The reflectance can be adjusted by changing the phase of the incident light and the reflected light according to the thickness of the dielectric film and adjusting the degree of interference of 2 kinds of light. The thickness of the half mirror composed of a multilayer body of dielectric films may be, for example, 50 μm or more and 200 μm or less. As such a half mirror, for example, a commercial product manufactured by ori corporation under the trade name "PICASUS" or the like can be used.

The reflective polarizing element has a function of transmitting polarized light in a specific polarized state (polarized direction) and reflecting light in other polarized states. The reflective polarizing element may be a linearly polarized light separation type or a circularly polarized light separation type, but is preferably a linearly polarized light separation type. The linear polarization separation type reflective polarizing element is disposed such that the reflection axis direction is substantially parallel to the absorption axis direction of the absorption type polarizing element.

As the linearly polarized light separation type reflective polarizing element, for example, those described in japanese patent application laid-open No. 9-507308 can be used. Examples of the commercial products include a product named "APCF" manufactured by the eastern electrician company, a product named "DBEF" manufactured by the 3M company, and a product named "APF" manufactured by the 3M company. Further, the commercial product may be used as it is or may be used after being subjected to secondary processing (for example, elongation). Examples of the circularly polarized light separation type reflective polarizing element include a laminate of a film obtained by immobilizing a cholesteric liquid crystal and a λ/4 plate. In addition, a wire grid type polarizing layer can also be used.

As shown in fig. 5, the optical laminate 110 according to the embodiment of the present invention has a design layer 110C on a visible light scattering layer 110A. In the case where the visible light scattering layer 110A has a visible light transmissive reflective layer on its surface, the design layer 110C is provided on the visible light transmissive reflective layer. The term "design" in this specification means a pattern or a color of an article. The pattern includes a motif or pattern. The colors may also be monochromatic and may comprise combinations of colors of the same hue but different chroma. The color, motif or pattern may also be tile-like. In addition, examples of the design will be described in detail below. The design layer 110C preferably has a high infrared transmittance. The design layer 110C may be in the form of a film such as a decorative film or may not be in the form of a film. The thickness of the design layer 110C is, for example, 1 μm or more and 150 μm or less.

The optical laminate 110 may further have other functional layers that perform specific functions. In this case, a single functional layer may be provided with 2 or more functions, or at least 1 layer of the above layers may be provided with other functions. The function that can be imparted to the optical laminate 110 is not particularly limited, but the optical laminate 110 according to the embodiment of the present invention further has a surface protective layer 110D shown in fig. 5 on the surface. The surface protection layer 110D is configured to function as follows, for example: hard Coating (HC) function, antifouling function, antiglare (AG) function, antireflection (AR) function, etc. which exhibit scratch resistance.

The color of the surface of the periphery 501P of the portion where the detection unit 100 is disposed is referred to as a peripheral color, and the color of the surface of the detection unit 100 is referred to as a detection portion color. Here, the detection part color refers to the color of the surface of the optical laminate 110. At this time, the peripheral color and the detection portion color are both non-black, and the color difference between the peripheral color and the detection portion color when measured by SCE method is 3 or less. Specifically, as described above, the condition of the expression of the number 1 is satisfied. An example of an L x a x b x color system is the CIE1976L x a x b x color system. From the viewpoint of improving the harmony between the peripheral color and the color of the detection section, the color difference is preferably 1.5 or less, more preferably 0.4 or less.

When the color difference is 3 or less, excellent designability is exhibited by adjusting the peripheral color to a level that is indistinguishable from the color of the surface of the optical laminate 110. In this state, the infrared detection device 120 and the light emitting device 130 can be hidden from view by the optical laminate 110. For example, the following can be effectively suppressed: since the existence of the infrared detection device 120 and the light emitting device 130 is known, the original actions or actions of the person may be changed according to psychological changes.

As illustrated in fig. 4, when the design of the surface of the periphery 501P of the portion where the detection unit 100 is disposed is referred to as a peripheral design, and the design of the surface of the optical laminate 110 is referred to as a detection portion design, the detection portion design is the same as or similar to the peripheral design. The detection part design and the peripheral design can have the same pattern and color. For example, a decorative film may be used to design the surface of the optical laminate 110 and the surface of the periphery 501P with a pattern or color. The surface of the periphery 501P may be provided with the surface protection layer.

With reference to fig. 9A to 9D, an example of a design that can be added to the surface of the optical laminate 110 and the surface of the periphery 501P of the portion where the detection unit 100 is disposed will be described. Fig. 9A shows an example of a design in which a continuous pattern is added to the surface of the optical laminate 110 and the surface of the peripheral edge 501P. In this example, a single pattern (design) is added to the surface of the periphery 501P and the surface of the optical laminate 110. The design can be realized by using 1 piece of decorative film. Therefore, there is no physical membrane boundary. The optical laminate 110 is located at any portion of the single pattern, and each of the 1 or more detection units 100 is hidden at the back side of the optical laminate 110.

Fig. 9B shows an example of a design in which a tile-like pattern is attached to the surface of the optical laminate 110 and the surface of the periphery 501P. The tile-like design of this example, which is designed to include a pattern, may be achieved by disposing a plurality of decorative films in parallel on a plane or curved surface including the surface of the optical laminate 110 and the surface of the periphery 501P. Therefore, there is a physical boundary of the films as a seam of each film. The tile-like design includes not only a pattern in which the same shapes are regularly arranged as shown in fig. 9B, but also a pattern in which different shapes are irregularly arranged in a state in which the widths of the boundaries are not fixed. The optical laminate 110 may be disposed at the boundary or may be disposed across the boundary. Each of the 1 or more detection units 100 is hidden at the back side of the optical laminate 110. In the example shown in fig. 9B, the optical laminate 110 is arranged so as to cross the boundary within the pattern formed by regularly arranging the star shapes.

Fig. 9C shows another example of a design in which a tile-like pattern is attached to the surface of the optical laminate 110 and the surface of the periphery 501P. The design of this example includes tile-like colors of the same hue but different chroma combinations, and can be realized by arranging a plurality of decorative films in a plane or curved surface including the surface of the optical laminate 110 and the surface of the periphery 501P. Therefore, there is a physical boundary of the films as a seam of each film. The design contains a plurality of regions 101 that are divided by visually recognized boundaries 102. The optical laminate 110 is disposed in 1 region among the plurality of regions 101. The detection unit 100 is hidden on the back side of the optical laminate 110. In the case of having a plurality of detection units 100, a plurality of optical laminates 110 are disposed in different areas among the plurality of areas 101. Each of the plurality of regions 101 may have any color or pattern.

Fig. 9D shows another example of a design in which a tile-like pattern is attached to the surface of the optical laminate 110 and the surface of the periphery 501P. The design includes a plurality of regions 101 divided by visually recognized boundaries 102, each of the plurality of regions 101 having an arbitrary pattern. The optical laminate 110 is disposed in 1 region among the plurality of regions 101. The detection unit 100 is hidden on the back side of the optical laminate 110.

(embodiment 1)

The infrared security system according to the present embodiment can be widely used as an infrared recognition system such as a mobile tracking system, iris recognition, face recognition, and vein recognition. In the following description, the infrared ray security system functions as a movement tracking system. The movement tracking system can recognize gestures, analyze a flow of people, measure a traffic volume, a speed, and the like of a traveling vehicle, for example. In addition, the infrared security system can automatically detect the entry of suspicious personnel and track or record.

The object is irradiated with infrared rays emitted from the light emitting device 130 and transmitted through the optical laminate 110. A part of the light reflected by the subject passes through the optical laminate 110 and enters the infrared sensor 122 of the infrared detection device 120. The security system 200 is configured to operate based on an output from the infrared detection device 120.

The security system 200 according to the present embodiment is configured to generate time-series data indicating movement of 1 or more subjects based on a subject signal generated when the infrared detection device 120 receives infrared rays emitted from the light emitting device 130 toward 1 or more subjects and reflected by the 1 or more subjects via the optical laminate 110, and to analyze movement of 1 or more subjects based on the time-series data.

Fig. 10 shows a diagram for explaining an example of managing locking of a conference room by a gesture.

Only a person who knows in advance where the detection unit 100 is provided on the wall 501 can approach the location and perform a gesture operation toward the detection unit 100. In case the trajectory of the gesture based movement coincides with the prescribed pattern, the lock will be unlocked. In contrast, a person who does not know where the detection unit 100 is provided on the wall 501 cannot perform a gesture operation before the door 500, and thus cannot unlock the lock. According to this example, since the unlocking of the lock can be managed by a gesture, a conventional Identification (ID) card, a key, or the like is not required, and the security system can be rationalized. Even if the pattern of the gesture is known, it is difficult to unlock the lock because the location where the detection unit 100 is provided cannot be specified. In this way, by disposing the infrared detection device 120 so as to be invisible, the security level can be enhanced.

Fig. 11 schematically shows a case where a plurality of detection units 100 are provided inside a wall 501. The infrared security system 300 in the present embodiment may include a plurality of detection units 100. In the illustrated example, 2 detection units 100 are disposed on both sides of the door 500. For example, by disposing a plurality of detection units 100, the movement of the subject 10 can be tracked in the case of movement. Even when a so-called "blocking" problem occurs in which, for example, the movement of the subject 10 cannot be detected due to the shadow of another person being blocked by the photographing performed by 1 camera, the problem can be solved.

According to the present embodiment, a design unit 400 (see fig. 4) including 1 or more detection units 100 and a wall 501 housing 1 or more detection units 100 is provided. The infrared security system 300 includes the design means and the security system 200 that operates based on the output from the infrared detection device 120. Here, the wall 501 may also be referred to as a "housing portion". The outer surface of the housing portion includes the surface of the optical laminate 110 provided for each of the 1 or more detection units 100. The same or similar patterns or colors may be added to the outer surface of the receiving portion and the surface of the optical laminate 110, respectively.

The infrared detection device 120 is disposed on the opposite side of the optical laminate 110 from the surface so that the position of the infrared detection device 120 is not determined. When the color of the outer surface is referred to as a peripheral color and the color of the surface of the optical laminate 110 is referred to as a detection portion color, both the peripheral color and the detection portion color are not black, and the color difference between the peripheral color and the detection portion color when measured by SCE is 3 or less. In this way, by adjusting the peripheral color to a level that is indistinguishable from the color of the surface of the optical laminate 110, a design unit that exhibits excellent design properties can be provided.

As described with reference to fig. 9A or 9B, a continuous pattern may be added to the outer surface of the storage portion and the surface of the optical laminate 110. The optical laminate 110 is disposed at any portion of the continuous pattern. As described with reference to fig. 9C or 9D, a tile-like design including a plurality of areas divided by visually recognized boundaries may be added to the outer surface of the housing portion and the surface of the optical laminate 110. The 1 or more optical laminates 110 are disposed in different regions of the plurality of regions. Each of the plurality of regions 101 may have any color or pattern.

Fig. 12 is a diagram for explaining an example in which the detection unit 100 is provided inside the wall 501 and 1 or more light source units 105 are arranged in the ceiling so as not to be visible from the outside.

The light source unit 105 includes an optical laminate 110 and a light emitting device 130. The operation of the light source unit 105 is controlled by a light emission control system. The hardware configuration example of the light emission control system is the same as that shown in fig. 3. In the example shown in fig. 12, the light emitting device 130 is provided at a position different from that of the infrared detection device 120. When the color of the surface around the portion where the light source unit 105 is disposed is referred to as a peripheral color, and the color of the surface of the light source unit 105 is referred to as a detection portion color, both the peripheral color and the detection portion color are not black, and the color difference between the peripheral color and the detection portion color when measured by SCE method is 3 or less. According to such a configuration, the subject 10 is irradiated with the infrared rays LB emitted from the light source unit 105 provided in the ceiling, and the detection unit 100 receives the light reflected by the subject 10.

The detection unit 100 and/or the light source unit 105 in the present embodiment may be installed outdoors such as a road, an intersection, a parking lot, etc., and may not be limited to being installed indoors such as a store, a facility, an airport, a station, etc. For example, by disposing a plurality of detection units 100 and/or light source units 105 in a channel connecting an entrance of an exhibition hall with an exhibition hall, it is possible to analyze a stream of people. Further, by rationalizing the security system, the effect of reducing the number of persons such as reception persons and patrol security personnel is obtained. For example, an algorithm for analyzing a stream of people described in Japanese patent application laid-open No. 2017-224148 is suitably used. The entire disclosure of japanese patent application laid-open No. 2017-224148 is incorporated by reference into this specification. For example, by disposing a plurality of detection units 100 and/or light source units 105 on a plurality of marker posts provided on an expressway at intervals, the traffic volume, speed, and the like of a traveling vehicle can be measured.

Fig. 13 is a block diagram illustrating processing performed by the processor 210 in a case where the security system 200 performs movement tracking of a moving body by functional block units. Fig. 14 is a flowchart showing an example of a processing procedure for tracking the movement of the moving body.

The processor 210 executes processing of blank signal acquisition 211, object signal acquisition 213, delta operation 214, time-series data generation 215, and movement analysis 216. Typically, the processing (or tasks) of each functional block is described in a computer program in units of modules of software.

(step S301)

The processor 210 of the security system 200 operates with reference to a blank signal generated when the infrared detection device 120 receives the infrared light for reference through the optical laminate 110. The blank signal does not contain information of the subject. When there is no subject within the angle of view of the infrared detection device 120 (or the infrared sensor 122), the light emitting device 130 emits infrared rays in response to a control signal output from the security system 200. The infrared ray at this time is referred to as "infrared ray for reference". The infrared ray detection device 120 outputs a blank signal having a magnitude corresponding to the intensity of the reference infrared ray transmitted through the optical laminate 110.

As illustrated in fig. 9A to 9D, the peripheral design and the detection portion design in the present embodiment each include a pattern. At this time, a blank signal having a magnitude corresponding to the intensity of the reference infrared ray transmitted through the optical laminate 110 having the pattern on the surface is output from the infrared ray detection device 120. The blank signal represents the intensity specific to the pattern. The memory 212 (e.g., ROM 220) stores a blank signal specific to the pattern. For example, the reference infrared ray may be emitted from the light emitting device 130 at the time of calibration of the detection unit 100. Alternatively, the reference infrared ray may be emitted from the light emitting device 130 at regular intervals, that is, periodically. In this case, the processor 210 acquires a blank signal every fixed period, and stores the acquired blank signal in the memory 212. Thus, the blank signal stored in the memory 212 can be updated every fixed period.

(step S302)

The infrared detection device 120 outputs a subject signal having a magnitude corresponding to the intensity of the infrared ray reflected by the subject 10 and transmitted through the optical laminate 110. The object signal contains information of the object 10.

(step S303)

The processor 210 operates based on the difference between the object signal and the blank signal, and the object signal is generated when the infrared detection device 120 receives infrared rays emitted from the light emitting device 130 toward 1 or more objects 10 and reflected by 1 or more objects 10 via the optical laminate 110. The subtractor may perform, for example, an operation of reading out a blank signal from the memory 212 and subtracting the blank signal from the subject signal for each frame.

(step S304, 305)

The processor 210 generates time-series data representing movement (for example, movement based on a gesture) of 1 or more subjects 10 based on the difference between the subject signals and the blank signals, and analyzes the movement of 1 or more subjects 10 based on the time-series data. The processor 210 generates time-series data representing the movement of the subject 10 based on the difference between the subject signal and the blank signal output from the subtractor. The time-series data contains information on movement of an object between a plurality of frames. The processor 210 may detect a movement vector of the subject using time-series data, for example, and perform analysis of movement of the subject 10 based on the movement vector. Alternatively, the processor 210 can apply an algorithm for motion capture described in, for example, japanese patent No. 4148281 to analyze the movement of the subject 10. The disclosure of japanese patent No. 4148281 is incorporated by reference in its entirety into this specification.

(step S306)

In the case where updating of the blank signal is required, the processor 210 periodically acquires the blank signal and updates (Yes at step S306). In the case where the update of the blank signal is not necessary, the processor 210 acquires the object signal (No at step S306).

According to the signal processing of the present embodiment, even when a pattern is added to the surface of the optical laminate 110, the offset component due to the infrared rays transmitted through the pattern portion can be removed from the object signal by calculating the difference between the object signal and the blank signal inherent to the pattern, and therefore the accuracy of the movement analysis of the object 10 can be improved.

The security system 200 may be configured to perform iris recognition, face recognition, vein recognition, and the like, and is not limited to movement tracking. For example, an algorithm of iris recognition described in japanese patent application laid-open publication 2020-160757, an algorithm of face recognition described in japanese patent application laid-open publication 2020-129175, and an algorithm of vein recognition described in japanese patent application laid-open publication 2019-159869 are suitably used, respectively. The disclosures of these publications are incorporated by reference in their entirety into this specification.

(embodiment 2)

The infrared security system in the present embodiment is a system for managing unlocking of a lock. The infrared ray security system is provided with: at least 1 detection unit including an optical laminate and an infrared detection device configured to receive infrared rays via the optical laminate; and a safety system that operates based on an output from the infrared detection device. The security system is configured to generate time-series data indicating movement of an object based on an object signal generated when an infrared detection device receives infrared rays emitted from a light emitting device toward the object and reflected by the object via an optical laminate, and unlock lock based on the time-series data.

Conventionally, there has been a problem that there is an increased risk of unlocking due to the position of the unlocking system being recognized by a third party. According to the present embodiment, for example, two-element recognition can be achieved by combining any two selected from the group consisting of position detection of an object, movement detection of the object, and an unlock code input from the object. For example, by combining the position detection of the object with the movement detection of the object, it is possible to provide an unlocking system which is not visible from the outside and is not in contact.

Fig. 15 shows a block diagram illustrating, in functional block units, processing performed by the processor 210 in the security system 200A according to example 1.

The processor 210 included in the security system 200A in this example performs processing of the object position detection 217 and the lock unlock determination 218 in addition to processing of the blank signal acquisition 211, the object signal acquisition 213, the difference operation 214, the time-series data generation 215, and the movement analysis 216.

The processor 210 calculates the relative positional relationship of the subject with respect to the infrared detection device 120 based on the subject signal output from the infrared detection device 120. For example, the processor 210 may transform the world coordinate system into a camera coordinate system using external parameters of the infrared detection device (camera) 120. The processor 210 can calculate the relative positional relationship of the subject with respect to the infrared detection device 120 by performing such coordinate transformation. For example, a method for detecting the relative position of a person described in Japanese patent application laid-open No. 2017-224148 is suitably used.

The processor 210 unlocks the lock based on the time series data and the positional relationship. For example, when the movement of the object coincides with the specified movement pattern and the object in the camera coordinate system is within a predetermined range during the fixed time, the processor 210 unlocks the lock. An example of movement of the object is a gesture. The fixed time may be set to, for example, 3 seconds to 10 seconds.

According to this example, by combining the position detection of the object with the movement detection of the object, it is possible to provide an unlocking system that is not visible from the outside and is not in contact. Only the person who is allowed to lock in advance can know the position of the hidden detection unit. Without the need for a physical key or a card key or the like. The lock cannot be unlocked unless a person takes a specified action at a specified location.

For example, iris recognition, face recognition, or vein recognition can be combined with position detection of the subject instead of movement detection of the subject, and two-element recognition can be realized, whereby the security level can be enhanced.

In fig. 16, a case where the detection unit 100 is provided inside the wall 501, and further, the input device 150 is provided in the wall 501 is schematically shown. A block diagram illustrating processing performed by the processor 210 in the security system 200B based on example 2 by a functional block unit is shown in fig. 17.

The input device 150 converts an unlock code input from the subject into data and inputs the data to the security system 200B. The input device 150 may be provided with a button for inputting an unlock code, and a display portion for displaying the inputted numerical value. The input device 150 may function as a card reader for reading an unlock code from a card key, or may function as a device for reading a two-dimensional code displayed on a terminal device such as a mobile phone.

The processor 210 included in the security system 200B in this example performs processing of the unlock code acquisition 219 and the lock unlock determination 218 in addition to processing of the blank signal acquisition 211, the object signal acquisition 213, the difference operation 214, the time-series data generation 215, and the movement analysis 216.

The processor 210 acquires information of the unlock code output from the input device 150. In the case where the movement of the subject coincides with the specified movement pattern and the unlock code coincides with the specified code, the processor 210 unlocks the lock. In this way, although there is a risk of unlocking only by input of the unlock code in the related art, by combining the movement detection of the object and the unlock code, two-element recognition can be realized, and the security level can be enhanced.

A block diagram illustrating processing performed by the processor 210 in the security system 200C based on example 3 by a functional block unit is shown in fig. 18. The processor 210 included in the security system 200C in this example performs processing of an unlock code acquisition 219 and a lock unlock determination 218 in addition to the blank signal acquisition 211, the object signal acquisition 213, the difference operation 214, the time-series data generation 215, and the object position detection 217.

The processor 210 acquires information of the unlock code output from the input device 150. In the case where the object in the camera coordinate system is within a prescribed range during a fixed time and the unlock code coincides with the specified code, the processor 210 unlocks the lock. In this way, although there is a risk of unlocking only by input of the unlock code in the related art, by combining the unlock code and the position detection of the object, two-element recognition can be realized, and the security level can be enhanced.

By combining the position detection of the object, the movement detection of the object, and the unlock code, multi-element identification can be realized, and the security level can be further enhanced. Further, by adding other elements such as iris recognition, face recognition, and vein recognition, the security level can be further enhanced.

In the case of using an infrared camera as the infrared detection device in the security system of the above-described embodiment, the optical laminate 110 is preferably selected so that a clear image can be obtained. In particular, the visible light scattering layer 110A is preferably high in linear transmittance of infrared rays and low in diffuse transmittance of infrared rays. For example, the average linear transmittance in the entire wavelength range of 760nm to 2000nm is preferably 40% or more, and the average diffuse transmittance in the entire wavelength range of 760nm to 2000nm is preferably 30% or less.

For example, when a so-called multispectral infrared camera described in patent document 3, which is configured to capture an image of an object formed by each of 2 or more infrared rays of different wavelength ranges included in infrared rays reflected by the object, is used as an infrared camera, more information can be obtained from the image, and image information indicating each image is generated. For example, in an infrared image captured by a normal infrared camera, there are cases where it is impossible to distinguish between objects having different colors in a normal optical image. In the case of using a multispectral infrared camera, since a plurality of images formed by infrared rays having a plurality of different wavelength ranges are acquired, for example, in a color image obtained by superimposing infrared images having different wavelength ranges as different color images (for example, primary color images of red, green, and blue), it is possible to distinguish objects having different colors in a normal optical image. As the multispectral infrared camera, for example, an infrared multispectral color night vision camera manufactured by Nanolux corporation can be used. In this case, the different wavelength ranges are, for example, 800 nm.+ -. 10nm, 870 nm.+ -. 10nm, 940 nm.+ -. 10nm. Of course, the wavelength range is not limited thereto, and the center wavelength is, for example, preferably 50nm or more different, and more preferably 70nm or more different.

In the case of using a multispectral infrared camera, an infrared light source that emits infrared light in the above wavelength range may be prepared, and the subject may be irradiated with infrared light from the infrared light source. Alternatively, the object may be irradiated with infrared rays having a wide wavelength range including the above wavelength range, and the object may be decomposed into infrared rays having the above wavelength range by using a prism or a filter before receiving light by the multispectral infrared camera. Further, the infrared light may be split into the infrared light having a larger wavelength range including the above wavelength range before the infrared light is irradiated to the subject.

In the case of using a multispectral infrared camera, the preferable values of the infrared linear transmittance and the infrared diffuse transmittance of the optical layered body are applied to infrared rays of the above-described different wavelength ranges. That is, the visible light scattering layer preferably has high linear transmittance and low diffuse transmittance for infrared rays in a large wavelength range. If the linear transmittance of the infrared ray is high, a high-quality image (for example, the boundary of the portions having different colors is more clear, or the chroma of a color image is high) can be obtained.

An example of an optical laminate suitable for use in the security system according to the embodiment of the present invention will be described below. The total light transmittance, the linear transmittance, and the diffuse transmittance were evaluated as follows, for example. The total light transmittance is a transmittance measured in a state where the optical layered body is disposed at the opening of the integrating sphere. The linear transmittance is a transmittance measured in a state where the optical laminate is disposed at a fixed distance (for example, 20 cm) from the opening portion of the integrating sphere. The diffuse transmittance is obtained by subtracting the linear transmittance from the total light transmittance. As a spectrometer, an ultraviolet visible near infrared spectrophotometer UH4150 (manufactured by Hitachi High-Tech Science Co., ltd.) was used. Here, VIS (Visible light) transmittance refers to an average value of transmittance of Visible light in a wavelength range of 400nm to less than 760nm, and IR (infrared) transmittance refers to an average value of transmittance of light for infrared (near infrared) light in a wavelength range of 760nm to 2000 nm.

Further, the sharpness and color resolution of an image obtained by using a normal infrared camera (IR and LED mode of DVS a10FHDIR manufactured by KENKO corporation, IR720 manufactured by NEEWER corporation) and using a multispectral infrared camera (infrared multispectral color night vision camera manufactured by Nanolux corporation) were evaluated. Regarding the observation result obtained by the IR camera, in the infrared image, a case where the subject can be clearly confirmed is a, a case where the subject is blurred is B, and a case where the outline of the subject cannot be confirmed is C. Regarding the observation results obtained by the multispectral infrared camera, the case where the difference in 3 or more colors can be confirmed in the infrared image is a, the case where the difference in 2 colors can be confirmed is B, and the case where the difference in colors cannot be confirmed is C.

Table 1 shows the results obtained by evaluating the optical characteristics of the optical layered bodies of samples 1 to 11. The value of L is 20 or more for each sample, and the sample is colored other than black.

TABLE 1

Sample 1 was a visible light scattering layer having a thickness of 350 μm, which was a filter (corresponding to example 13 of the above-mentioned international application) having an average silica particle diameter of 181nm and a silica content of 40 mass%, and was high in IR linear transmittance and low in IR diffuse transmittance, so that a clear color image could be obtained even in a dark environment using a multispectral infrared camera. However, since the VIS linear transmittance is about 27% and the VIS total light transmittance is about 43% and is relatively high, a sufficient hiding effect may not be obtained depending on the environment, and the detection portion, the light source, and the like may be recognized. In an environment where illumination is performed in a normal building, it is preferable that the VIS linear transmittance is about 20% or less and the VIS total light transmittance is about 40% or less in order to obtain a sufficient concealing effect.

Sample 2 was a visible light scattering layer having a silica content of 40 mass% and a thickness of 200 μm, which was a filter having a silica average particle diameter of 221nm and a silica content of 40 mass% (example 6 of the above-mentioned international application), and an IR diffuse transmittance was high and low to 1% or less, so that a very clear infrared image could be obtained. Further, since the linear transmittance of infrared rays at 780nm, 870nm, 940nm, which are different from each other and have a center wavelength of 50nm or more, is 60% or more, clear color images can be obtained even in a dark environment using a multispectral infrared camera.

Sample 3 was a visible light scattering layer having a thickness of 350 μm for a filter having a silica average particle diameter of 300nm and a silica content of 40 mass%, and was able to obtain a very clear infrared image because the IR linear transmittance was high and the IR diffuse transmittance was low.

The sample 4 is an optical laminate having a visible light scattering layer of the sample 2 and a half mirror configured by a dielectric multilayer film so as to transmit infrared rays. Sample 4 has a slightly lower IR linear transmittance and a slightly higher IR diffuse transmittance than sample 2, but has an IR linear transmittance of more than 40% and an IR diffuse transmittance of less than 30%, and thus can obtain a clear infrared image.

Sample 5 was an optical laminate having a visible light scattering layer of sample 2 and a visible light absorbing layer formed using an IR-transmissive black ink (thickness 6 μm).

Sample 6 is an optical laminate having a visible light scattering layer and a wire grid type reflective layer of sample 2.

Sample 7 is an optical laminate having a visible light scattering layer of sample 2 and a linearly polarized light separation type reflective polarizing element.

Sample 8 is an optical laminate having a magenta decorative layer on the surface of the visible light-scattering layer of sample 2.

Sample 9 corresponds to comparative example a described in the above-mentioned international application, and corresponds to an optical article described in japanese patent application laid-open No. 2013-65052. Sample 9 has lower IR linear transmittance and higher IR diffuse transmittance than sample 2. The IR linear transmittance is higher than 40%, but the IR diffuse transmittance is also higher than 30%, so that the obtained infrared image is blurred, and the subject may not be recognized.

Sample 10 was a PTFE film having a thickness of 0.5 mm. Since the IR linear transmittance is low and the IR diffuse transmittance is high, the obtained infrared image is blurred, and the subject may not be recognized.

Sample 11 was a cloudy plastic plate (made of polystyrene, and the thickness was 0.3 mm). The IR linear transmittance is very low and therefore cannot be used as an optical laminate in the security system of the embodiment of the present invention.

As exemplified herein, the filter (visible light scattering layer) described in the above-mentioned international publication has a high IR linear transmittance and a low IR diffuse transmittance, and thus can obtain a very clear infrared image. In particular, in a large wavelength range (for example, the entire wavelength range of 760nm to 2000 nm), the wavelength dependence and the angle of incidence dependence of the infrared transmission characteristic are small, and thus the infrared transmission characteristic is suitable for use as a filter arranged on the front surface of an infrared detection device (particularly, a multispectral infrared camera). It can be understood from a comparison of samples 1 to 3 that the infrared ray transmission characteristics can be adjusted by changing the particle size distribution or the content of the silica fine particles. Further, as exemplified as sample 4, the infrared transmission characteristics can be adjusted by laminating with another optical film such as a dielectric multilayer film.

[ Industrial applicability ]

The infrared security system according to the embodiment of the present invention can be used for, for example, an identification technique using infrared rays, a movement tracking technique, or the like.

70, a network; 100, a detection unit; 105, a light source unit; 110 an optical laminate; 110A, a visible light scattering layer; 110B, a substrate layer; 110C, designing a layer; 110D, a surface protection layer; an infrared detection device 120; 130, a light emitting device; 150, an input device; 200, a security system.

Claims

1. An infrared ray security system is provided with:

2. The infrared security system of claim 1, wherein,

when the color of the surface of the periphery of the portion where the at least 1 detection unit is arranged is referred to as a peripheral color and the color of the surface of the at least 1 detection unit is referred to as a detection portion color, both the peripheral color and the detection portion color are not black, and the color difference between the peripheral color and the detection portion color when measured by SCE is 3 or less.

3. The infrared security system of claim 2, wherein,

the safety system is configured such that,

and analyzing movement of the 1 or more subjects based on the time-series data.

4. The infrared security system of claim 1, wherein,

the detector design is the same as or similar to the perimeter design,

5. The infrared security system of claim 4, wherein,

the security system acquires the blank signal every fixed period.

6. An infrared security system as claimed in claim 4 or 5, wherein,

the peripheral design and the detection portion design each include a pattern,

7. An infrared security system as claimed in any one of claims 4 to 6, wherein,

the safety system operates based on a difference between an object signal generated when the infrared detection device receives infrared rays emitted from a light emitting device to 1 or more objects and reflected by the 1 or more objects via the optical laminate, and the blank signal.

8. The infrared security system of claim 7, wherein,

the safety system is configured such that,

and analyzing movement of the 1 or more subjects based on the time-series data.

9. An infrared security system as claimed in claim 3, 7 or 8, wherein,

the at least 1 detection unit includes the light emitting device that emits infrared rays to the outside via the optical laminate.

10. The infrared security system of any one of claims 1 to 9, wherein,

the at least 1 detection unit includes a plurality of detection units.

11. An infrared ray security system is provided with:

the detector design is similar to the perimeter design,

12. An infrared light emission control system is provided with:

13. The infrared security system of any one of claims 1 to 11, wherein,

the infrared detection device is configured to capture an image of an object based on each of 2 or more infrared rays of different wavelength ranges included in infrared rays reflected by the object, and to generate image information indicating each of the images.

14. The infrared security system of any one of claims 1 to 11 and 13, wherein,

the optical laminate has a linear transmittance of 20% or less in the visible light wavelength region and a total light transmittance of 40% or less.

15. The infrared security system of claim 14, wherein,

the optical laminate includes a visible light scattering layer having a linear transmittance of 60% or more for light having at least a part of wavelengths in a wavelength range of 760nm to 2000 nm.

16. The infrared security system of claim 15, wherein,

the optical laminate has a linear transmittance of 40% or more for light in a wavelength range of 760nm to 2000 nm.

17. The infrared security system of claim 16, wherein,

the optical laminate has a diffuse transmittance of less than 30% in the entire wavelength range of 760nm to 2000 nm.

18. An infrared security system as claimed in any one of claims 14 to 17, wherein,

the optical laminate has a visible light scattering layer in which fine particles serving as a light scattering body are dispersed in a matrix.

19. The infrared security system of claim 18, wherein,

the microparticles constitute at least colloidal amorphous aggregates.

20. An infrared security system as claimed in claim 18 or 19, wherein,

the transmittance curve of the visible light wavelength region of the visible light scattering layer has a curve portion in which the linear transmittance monotonically decreases from the long wavelength side to the short wavelength side, and the curve portion is shifted toward the long wavelength side as the incident angle increases.

21. An infrared security system as claimed in any one of claims 18 to 20, wherein,

the optical laminate has a surface protective layer on the surface.

22. An infrared security system as claimed in any one of claims 18 to 21, wherein,

the optical laminate has a design layer.

23. An infrared security system as claimed in any one of claims 18 to 22, wherein,

the optical laminate has a substrate layer.

24. A design unit is provided with:

a housing part for housing the 1 or more detection units,

25. The design unit of claim 24, wherein,

when the color of the outer surface is referred to as a peripheral color and the color of the surface of the optical laminate is referred to as a detection portion color, both the peripheral color and the detection portion color are non-black, and a color difference between the peripheral color and the detection portion color when measured by SCE is 3 or less.

26. The design unit of claim 24, wherein,

a single pattern is attached to the outer surface and the surface of the optical laminate,

27. The design unit of claim 24, wherein,

a design including a plurality of regions divided by the visually recognized boundary is added to the outer surface and the surface of the optical laminate,

each of the plurality of regions has any color or pattern.

28. An infrared ray security system is provided with:

the design unit of any one of claims 24 to 27; and

a safety system operated based on an output from the infrared detection device,

the infrared detection device cannot be visually recognized from the outside.