Non-invasive optical detector for internal substances

Abstract

Non-invasive optical detector for internal substances, comprising: a diode arrangement (110) which a plurality of light-emitting diodes (111a, 111b) configured to emit light to a target having an internal substance to be detected, a plurality of photodiodes (112) configured to receive light reflected from the target after it has been emitted by the plurality of light-emitting diodes (111a, 111b); a controller (130) configured to control light-emitting diodes of the plurality of light-emitting diodes (111a, 111b) to be turned on or off, and to process a signal received from photodiodes (112) of the plurality of photodiodes (112), and a substrate (140) in which the diode arrangement (110) and the controller (130) are arranged, characterized in that the plurality of light-emitting diodes (111a, 111b) and the plurality of photodiodes (112) each have a size of several micrometers to several tens of micrometers and are arranged at intervals of several micrometers to several tens of micrometers from each other, the substrate (140) has a first region (141) and a second region (142) with a lower thermal conductivity than the first region (141), and the diode arrangement (110) is arranged on the first region (141) of the substrate (140) and the controller (130) is arranged on the second region (142) of the substrate (140).

Description

BACKGROUND OF THE INVENTIONTechnical field

[0001] The present invention relates to a non-invasive optical detector for internal substances according to the preamble of claims 1 and 11. Description of the state of the art

[0002] Traditionally, various attempts have been made to non-invasively detect alcohol concentrations in living tissue. Non-invasive detection systems have also been developed using polarimetry, mid-infrared spectroscopy, Raman spectroscopy, cormoscopy, and radiofrequency spectroscopy. The method described above is referred to as the optical measurement method.

[0003] In recent years, attempts have been made to prevent drunk driving by installing an alcohol detection sensor in a vehicle to prevent the engine from starting when a driver is drunk. An optical alcohol detector, which uses the optical measurement method described above, can be considered the alcohol detection sensor applicable to the vehicle.

[0004] Meanwhile, a breathalyzer can be considered a method for measuring body alcohol concentration in addition to the optical measurement method described above. However, in the case of a breathalyzer, there is the problem that any person who is not drunk can start the engine, and a drunk driver can take over the vehicle. Since the optical alcohol detector can be easily integrated into the vehicle's detection function, preventing a drunk driver from starting the engine can be effectively implemented in advance.

[0005] However, it has been found that a conventional optical breathalyzer comprising a light emitter, a light receiver, and a circuit for processing the signals of the light emitter and the light receiver is too large to be applied to a vehicle target device such as a start button. Therefore, it is desirable to downsize the optical breathalyzer to a size sufficient to be installed in a location such as a start button that provides an engine start lock function.

[0006] A non-invasive optical detector for internal substances according to the preamble of claim 1 is known from US 2010 / 0 241 006 A1. A comparable disclosure, in which photodetectors are used instead of photodiodes, can be found in WO 2018 / 148 701 A1. A non-invasive optical detector for internal substances according to the preamble of claim 1 is known from US 8 452 402 B2. DESCRIPTION OF THE INVENTION

[0007] The present invention has been made to solve the above-mentioned problems of the prior art while maintaining the advantages achieved by the prior art.

[0008] One aspect of the present invention provides a miniaturized optical detector for internal substances (e.g., alcohol) by integrating a configuration.

[0009] Furthermore, an aspect of the present invention provides a structure for preventing interference of components such as a light emitter and a light receiver due to the integration of the optical internal substance detector.

[0010] According to one aspect of the present invention, a non-invasive optical detector for internal substances comprises the features in claim 1.

[0011] According to one aspect of the present invention, a non-invasive optical detector for internal substances comprises the features in claim 11.

[0012] Embodiments of the present invention emerge from the subclaims and the following description. SHORT DESCRIPTION OF THE CHARACTERS

[0013] In order that the invention may be well understood, various embodiments thereof will now be described, by way of example, with reference to the accompanying drawings, in which: Fig. Figure 1 schematically illustrates an optical alcohol detector installed on a button; Fig. 2 is a vertical cross-sectional view showing part of the key of Fig. 1 represents; Fig. 3 schematically illustrates an optical alcohol detector; Fig. 4 is a vertical cross-sectional view showing the optical alcohol detector of Fig. 3 illustrates; and Fig. 5 illustrates a circuit of an optical alcohol detector. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0014] It is understood that in the drawings, corresponding reference numerals designate like or corresponding parts and features.

[0015] It should be noted that when adding reference numerals to the constituent elements in each of the drawings, the same constituent elements have the same reference numerals even if they are shown in different figures. Furthermore, in describing the present invention, when it is considered that detailed descriptions of well-known functions or structures may obscure the essential points, the detailed descriptions of the well-known functions or structures will be omitted.

[0016] Furthermore, when describing the components of the forms of the present invention, it is possible to use terms such as first, second, A, B, (a), (b), and the like. These terms serve only to distinguish the constituent elements from all other constituent elements, but do not limit the type, order, or sequence, and the like, of the corresponding features by the terms. Furthermore, it should also be understood that the expression that a constituent element is "connected," "coupled," or "linked" to another constituent element means that a constituent element may be directly linked or connected to another constituent element, or may also be "connected," "coupled," or "linked" to another constituent element via another component therebetween.

[0017] Fig. Figure 1 schematically illustrates an optical alcohol detector installed on a key in one form of the present invention, and Fig. 2 is a vertical cross-sectional view showing a part of the key of Fig. 1 represents. Fig. Figure 3 schematically illustrates an optical alcohol detector according to one form of the present invention, and Fig. 4 is a vertical cross-sectional view showing the optical alcohol detector of Fig. 3 represents.

[0018] An optical alcohol detector 100 is described as an exemplary form of an optical internal substance detector. However, the scope of the present invention is not limited thereto. For example, the optical alcohol detector 100 can be used to detect glucose (blood sugar) in a body instead of alcohol through an adjustment such as changing a light wavelength.

[0019] In one form, the optical alcohol detector 100 includes a diode array 110 and a controller 130 for controlling the diode array 110.

[0020] The diode array 110 includes: a plurality of light-emitting diodes (LEDs) 111a and 111b for emitting light toward a target F at which alcohol is detected, and a plurality of photodiodes (PDs) 112 for receiving light reflected from the target F after being emitted by the light-emitting diodes 111a and 111b.

[0021] The target F may be an object onto which the light emitted by the light-emitting diodes 111a and 111b is reflected and may include alcohol. With reference to Fig. 1, the target F can be, for example, a human finger. When a person consumes alcohol, the blood alcohol level rises, and the alcohol-containing blood is transported to the finger via a blood vessel.

[0022] In this case, when a predetermined light (e.g., laser) is directed at the finger, the amount of light absorption changes depending on the blood alcohol level. The blood alcohol level can be determined by examining the light reflected from the finger. The non-invasive optical alcohol detector of the present invention utilizes this principle.

[0023] Meanwhile, in one form, the controller 130 may be provided to control the plurality of light-emitting diodes 111a and 111b to be turned on or off and to process a signal obtained from the photodiodes 112.

[0024] Various attempts have been made to non-invasively detect alcohol concentrations in living tissue. Non-invasive detection systems have also been developed using polarimetry, mid-infrared spectroscopy, Raman spectroscopy, cormoscopy, and high-frequency spectroscopy. The method described above is referred to as the optical measurement method.

[0025] In recent years, attempts have been made to prevent drunk driving by installing an alcohol detection sensor in a vehicle to prevent the engine from starting when the driver is drunk. An optical alcohol detector using the optical measurement method described above can be considered the alcohol detection sensor applicable to the vehicle.

[0026] Meanwhile, in addition to the optical measurement method described above, breathalyzer testing can also be considered as a method for measuring body alcohol concentration. However, breathalyzer testing has the problem that a non-drinking person will start the engine instead of a drinking person. Since the optical alcohol detector can be easily integrated into a vehicle's driver detection function, engine start inhibit can be effectively implemented.

[0027] However, it has been found that a conventional optical breathalyzer device comprising a light emitter, a light receiver, and a circuit for processing the signals of the light emitter and the light receiver is too large to be applied to the interior of the vehicle. In particular, it is desirable to downsize the optical breathalyzer to a size sufficient for installation in a location such as a start button for application to the driver lock function to prevent engine starting.

[0028] Since the emitting diodes 111a and 111b are integrated into a micro unit and the photodiodes 112 are integrated into a single chip, and the controller 130 is integrated into the same chip to provide a micro alcohol sensor, the optical alcohol detector 100 is a microelectromechanical system (MEMS) chip that can perform optical transmission, optical reception, and signal processing on one chip.

[0029] The characteristics of the optical alcohol detector 100 according to one form are described in detail below.

[0030] With reference to the Fig. 1 and Fig. 2, the optical alcohol detector 100 is installed in a button that a person touches, such as a start button 10 of a vehicle, according to a shape, thereby being arranged to detect alcohol when the person touches the button 10. For this purpose, a button window 11 may be formed on a surface of the button 10 that the person touches, the light emitted from the optical alcohol detector 100 may be irradiated to the target F through the button window 11, and the light reflected from the target F may be incident on the optical alcohol detector 100 through the button window 11.

[0031] The optical alcohol detector 100 may further include a lens array 120 disposed on one side of the diode array 110 to converge the light emitted by the plurality of light-emitting diodes 111a and 111b and the light incident on the plurality of photodiodes 112.

[0032] The diode array 110 of the optical alcohol detector 100 includes the plurality of light-emitting diodes 111a and 111b and the plurality of photodiodes 112. The plurality of light-emitting diodes 111a and 111b and the plurality of photodiodes 112 each have a size of several micrometers to several tens of micrometers and are arranged at pitches of several micrometers to several tens of micrometers.

[0033] For example, the diode array 110 can be fabricated in the same way as a miniature fluorescence sensor with a single- or multi-pixel architecture. The miniature fluorescence sensor can be configured to include a light source such as an LED or laser, a photodetector adjacent to the light source, and a fluorescence emission filter.

[0034] For example, the diode array 110 may be configured to incorporate a vertical cavity surface-emitting laser (VCSEL). The VCSEL is suitable for use in an integrated device because the VCSEL is capable of emitting light in a direction perpendicular to a semiconductor wafer plane (e.g., upwards). Compared to an LED, the VCSEL can emit light with higher intensity and has the advantage of being implemented with a smaller sensor. Furthermore, the VCSEL integrates various light sources to easily implement an integrated device.

[0035] In this case, it is difficult to accurately determine the alcohol concentration in the target F if the light emitted by the light-emitting diodes 111a and 111b is not reflected by the target F but directly hits the photodiodes 112. Thus, the lens array 120 is used to reduce or minimize the interference between the light-emitting diodes 111a and 111b and the photodiodes 112 arranged at the intervals of the microunits.

[0036] Meanwhile, the diode array 110 and the lens array 120 may be configured as a package. The optical alcohol detector 100 may be provided as a light transmitter-receiver chip structure in which the diode array 110 and the lens array 120 are formed in a package. Thus, according to the present invention, it is possible to simplify manufacturing of the optical alcohol detector 100 and prevent an arrangement of the light-emitting diodes 111a and 111b and the photodiodes 112 from being shifted during a manufacturing process of the optical alcohol detector 100.

[0037] The optical alcohol detector 100 may further include a substrate 140 in which the diode array 110 and the controller 130 are arranged.

[0038] With reference to Fig. 2, the substrate 140 may be configured to have a first region 141 and a second region 142 having a lower thermal conductivity than the first region 141

[0039] The diode array 110 may be disposed on the first region 141 of the substrate 140, and the controller 130 may be disposed on the second region 142 of the substrate 140. The diode array 110 includes the light-emitting diodes 111a and 111b, and the light-emitting diodes 111a and 111b may generate heat when emitting light. The light-emitting diodes 111a and 111b and the photodiodes 112 that form the diode array 110, and conductive wires that electrically connect the light-emitting diodes 111a and 111b to the photodiodes 112, may be damaged if a temperature of the diode array 110 increases due to the heat generated in the diode array 110. Therefore, it is desirable to effectively dissipate the heat generated by the diode array 110.

[0040] According to one form, since the diode array 110 is arranged in the first region 141 having a high heat transfer rate (or thermal conductivity) of the substrate 140, the heat can be effectively radiated through the substrate 140.

[0041] The optical alcohol detector 100 may further include a cooler 150 for effective heat dissipation of the diode array 110 and the controller 130.

[0042] The cooler 150 may be arranged on the other side opposite to the one side on which the diode array 110 and the controller 130 are arranged to cool the substrate 140.

[0043] In another form, the cooler 150 can be configured as an air- or oil-cooled cooler. Furthermore, for example, the cooler 150 can be formed from a material with high thermal conductivity, such as metal, and cool the substrate 140 with air. Alternatively, the cooler 150 can be formed from a material with high thermal conductivity, wherein a side of the cooler 150 not in contact with the substrate 140 can be in contact with a separate element, and thus the substrate 140 can be cooled by transferring heat to the separate element.

[0044] The optical alcohol detector 100 according to the present invention can be easily mounted near a driver's seat in addition to the start button in the vehicle because the optical alcohol detector 100 has a vertical thickness T1 of less than about 10 mm, which corresponds to a distance between an upper surface of the optical alcohol detector 100 and a lower surface of the optical alcohol detector 100.

[0045] With reference to Fig. 3, the plurality of light-emitting diodes 111a and 111b includes at least one first light-emitting diode 111a that emits light L1 of a first wavelength and at least one second light-emitting diode 111b that emits light L2 of a second wavelength longer than the first wavelength.

[0046] At least one first light-emitting diode 111a may include a plurality of first light-emitting diodes 111a arranged in a predetermined column direction D1 to form a first column of light-emitting diode.

[0047] The second light-emitting diodes 111b may include a plurality of second light-emitting diodes 111b arranged in the column direction D1 to form a second column of the light-emitting diode.

[0048] The plurality of photodiodes 112 may include a plurality of photodiodes 112 arranged in the column direction D1 to form a first column of the photodiode.

[0049] In one form, the plurality of photodiodes 112 may be arranged in a plurality of columns. Referring to Fig. 3, the plurality of photodiodes 112 may be arranged, wherein a first column of the photodiode, a second column of the photodiode, and a third column of the photodiode are arranged in a row direction D2.

[0050] The diode array 110 may be configured to be arranged such that the first column of the light-emitting diode, the first column of the photodiode, and the second column of the light-emitting diode are arranged in a row direction in the corresponding order.

[0051] By the above arrangement, the light reflected from the target F after being emitted from the first light-emitting diode 111a and the light reflected from the target F after being emitted from the second light-emitting diode 111b can be effectively detected by the photodiodes 112.

[0052] The first light-emitting diode 111a may be a laser diode emitting laser beam of a first wavelength and the second light-emitting diode 111b may be a laser diode emitting laser beam of a second wavelength.

[0053] According to the present invention, since the laser diodes emitting laser beams of different wavelengths are alternately arranged and the photodiodes are arranged between the laser diodes, the difference in transmission and reception sensitivity of each wavelength due to a difference in the position of each laser diode can be reduced or minimized. Accordingly, the alcohol (concentration) that determines the performance can be improved.

[0054] Meanwhile, although not shown, the plurality of light-emitting diodes 111a and 111b may further include a light-emitting diode that emits light at a wavelength other than the first wavelength and the second wavelength. In this case, the first column of light-emitting diodes, the second column of light-emitting diodes, and a third column of light-emitting diodes may be arranged adjacent to each other in the row direction, and the columns of light-emitting diodes may be arranged therebetween in the same manner as described above.

[0055] The plurality of light-emitting diodes 111a and 111b and the plurality of photodiodes 112 can be prepared to have a size of several micrometers (µm) to several tens of micrometers (µm).

[0056] The plurality of light-emitting diodes 111a and 111b and the plurality of photodiodes 112 may be arranged at a distance of several micrometers (µm) to several tens of micrometers (µm) from each other as described above.

[0057] According to the present invention, the light emitted by the plurality of light-emitting diodes 111a and 111b can be directly directed to the target F, and the light reflected by the target F can be directly directed to the plurality of photodiodes 112. Therefore, the light loss can be minimized in a method in which the light emitted by the light-emitting diodes 111a and 111b is reflected by the target F and received by the photodiodes 112, and alcohol (concentration) in the target F can be accurately detected.

[0058] On the other hand, conventionally, it was necessary to generate stronger light in the light emitter, taking into account the light loss when the light generated in the light emitter is transmitted through an optical fiber or the like. However, according to the present invention, since this light loss can be reduced, relatively weak light can be used. Accordingly, the intensity of the light generated in the light emitter can be reduced compared to the conventional emitter, thereby reducing the heat generated by the light.

[0059] With reference to the Fig. 3 and Fig. 4, the lens array 120 may include a plurality of microlenses 121 having a number corresponding to the number of the plurality of light-emitting diodes 111a and 111b and the plurality of photodiodes 112 and arranged according to the arrangement of the plurality of light-emitting diodes 111a and 111b and the plurality of photodiodes 112.

[0060] In one form, the lens assembly 120 may include a plurality of microlenses 121 and a plate for mounting the plurality of microlenses 121.

[0061] Alternatively, the lens array 120 may be provided with a plurality of convex lens-shaped projections on one side of a plate-shaped base plate, and the plurality of microlenses 121 may be the projections described above. Here, the plate-shaped base plate and the convex lens-shaped projections (i.e., the microlenses) may be formed of a light-transmitting material.

[0062] Each of the plurality of microlenses 121 may have a convex shape toward the other side opposite to the one side facing the plurality of light-emitting diodes 111a and 111b and the plurality of photodiodes 112.

[0063] With reference to Fig. 4, in order to converge the light emitted from the plurality of light-emitting diodes 111a and 111b and the light incident on the plurality of photodiodes 112, the plurality of microlenses 121 may be arranged to correspond to the positions of the plurality of light-emitting diodes 111a and 111b and the plurality of photodiodes 112 with respect to a vertical direction.

[0064] Alternatively, the first light-emitting diode 111a and the second light-emitting diode 111b may be provided with surface-emitting laser diodes that emit laser beams on one of their surfaces, respectively.

[0065] The light L1 of the first wavelength emitted by the first light-emitting diode 111a and the light L2 of the second wavelength emitted by the second light-emitting diode 111b can be refracted by the microlenses 121 to be convergently irradiated to the target F. For this purpose, the focal lengths of the microlenses 121 arranged at positions corresponding to the first light-emitting diode 111a and the second light-emitting diode 111b can be adjusted based on a position of the target F (e.g., a position at which the finger, i.e., the target F, touches the key window 11 in Fig. 1 touched).

[0066] The light incident on the photodiodes 112 after being reflected by the target F can be refracted by the microlenses 112 to converge on the photodiodes 112. The focal lengths of the microlenses 121 arranged corresponding to the photodiodes 112 can be determined based on the thickness of the photodiodes 112 and the lens array 120 or a distance between the microlenses 121 and a detection portion of the photodiodes 112.

[0067] Therefore, the microlenses 121 arranged corresponding to the first light-emitting diode 111a and the second light-emitting diode 111b and the microlenses 121 arranged corresponding to the photodiodes 112 can be provided with the same or different focal distances. Furthermore, the focal lengths of the microlenses 121 can be determined depending on the structure of the object (the key 10 in one embodiment) on which the optical alcohol detector 100 is installed.

[0068] Fig. Figure 5 illustrates a circuit of an optical alcohol detector according to another form of the present invention.

[0069] The controller 130 may include a light-emitting diode control circuit 131 for generating a signal for controlling the first light-emitting diode 111a and the second light-emitting diode 111b and a photodiode output circuit 132 for receiving a signal generated in the photodiodes 112.

[0070] The controller 130 may detect the amount of alcohol (or the alcohol concentration) based on the signal generated at the plurality of photodiodes 112 when the first light-emitting diode 111a is turned on and the second light-emitting diode 111b is turned off, and the signal generated at the plurality of photodiodes 112 when the first light-emitting diode 111a is turned off and the second light-emitting diode 111b is turned on.

[0071] In particular, the controller 130 may determine the amount of alcohol in the target F according to a following method.

[0072] First, the controller 130 turns on the first light-emitting diode 111a to irradiate the light onto the target F. The photodiodes 112 output a current corresponding to an optical signal to the controller 130 when the photodiodes 112 receive the light reflected from the target F after being emitted by the first light-emitting diode 111a.

[0073] The controller 130 performs signal processing on the signal (e.g., an output current) received from the photodiodes 112 to quantitatively calculate an absorption rate of alcohol based on the light L1 of the first wavelength. That is, the controller 130 calculates the amount of light L1 of the first wavelength absorbed by the alcohol in the target F.

[0074] The controller 130 turns off the first light-emitting diode 111a and then turns on the second light-emitting diode 111b to irradiate light onto the target F. The photodiodes 112 output a current corresponding to an optical signal to the controller 130 when the photodiodes 112 receive the light reflected from the target F after being emitted by the second light-emitting diode 111b.

[0075] The controller 130 performs signal processing on the signal (e.g., an output current) received from the photodiodes 112 to quantitatively calculate an absorption rate of alcohol based on the second wavelength light L2. That is, the controller 130 calculates the amount of second wavelength light L2 absorbed by the alcohol in the target F.

[0076] Subsequently, the controller 130 estimates a variation in the absorption rate of alcohol with respect to the light of each wavelength to determine the alcohol amount of the target F or the alcohol concentration of the target F.

[0077] The non-invasive optical alcohol detector according to exemplary forms provided as described above can be miniaturized in size compared to the conventional optical alcohol detector and can be applied to any part of the vehicle interior, such as the vehicle start button. Furthermore, the optical alcohol detector can be installed in the vehicle to prevent a drunk driver from starting the engine, thus preventing drunk driving.

[0078] According to the present invention, one or more of the following effects can be achieved.

[0079] First, the optical internal substance detector can be integrated to be miniaturized because the diode array is provided with the plurality of light-emitting diodes and the plurality of photodiodes each having the size of the micro unit and arranged at micro unit intervals.

[0080] Secondly, since the lens array arranged on one side of the diode array is provided to converge the light emitted from the plurality of light-emitting diodes and the light incident on the plurality of photodiodes, the interference between the integrated light-emitting diodes and the photodiodes can be prevented and the performance of the internal substance detector can be improved.

Claims

[1] Non-invasive optical detector for internal substances, comprising: a diode arrangement (110) which a plurality of light-emitting diodes (111a, 111b) configured to emit light to a target having an internal substance to be detected, a plurality of photodiodes (112) configured to receive light reflected from the target after it has been emitted by the plurality of light-emitting diodes (111a, 111b); a controller (130) configured to control light-emitting diodes of the plurality of light-emitting diodes (111a, 111b) to be turned on or off, and to process a signal received from photodiodes (112) of the plurality of photodiodes (112), and a substrate (140) in which the diode arrangement (110) and the controller (130) are arranged, characterized by , that the plurality of light-emitting diodes (111a, 111b) and the plurality of photodiodes (112) each have a size of several micrometers to several tens of micrometers and are arranged at intervals of several micrometers to several tens of micrometers from each other, the substrate (140) has a first region (141) and a second region (142) with a lower thermal conductivity than the first region (141), and the diode arrangement (110) is arranged on the first region (141) of the substrate (140) and the controller (130) is arranged on the second region (142) of the substrate (140). [2] A non-invasive optical internal substance detector according to claim 1, wherein said plurality of light-emitting diodes (111a, 111b) comprises: a first light-emitting diode (111a) configured to emit light having a first wavelength, and a second light-emitting diode (111b) configured to emit light having a second wavelength longer than the first wavelength. [3] The non-invasive optical internal substance detector according to claim 2, wherein the controller (130) is configured to detect an amount of the internal substance in the target based on a signal generated at the plurality of photodiodes (112) when the first light-emitting diode (111a) is turned on and the second light-emitting diode (111b) is turned off, or a signal generated at the plurality of photodiodes (112) when the first light-emitting diode (111a) is turned off and the second light-emitting diode (111b) is turned on. [4] A non-invasive optical detector for internal substances according to any preceding claim, wherein light-emitting diodes (111a, 111b) of the plurality of light-emitting diodes (111a, 111b) are divided into a first light-emitting diode group having first light-emitting diodes (111a) arranged in a predetermined column direction (D1) to form a first column of light-emitting diode (111a), and a second light-emitting diode group having second light-emitting diodes (111b) arranged in the predetermined column direction (D1) to form a second column of light-emitting diode (111b), wherein photodiodes (112) of the plurality of photodiodes (112) are arranged in the predetermined column direction (D1) to form a first column of photodiodes (112), and wherein a light wavelength emitted by the first light-emitting diodes (111a) is different from a light wavelength emitted by the second light-emitting diodes (111b), and the first column of the photodiode (112) is arranged alternately with at least one of the first column of the light-emitting diode (111a) or the second column of the light-emitting diode (111b). [5] A non-invasive optical internal substance detector according to claim 4, wherein the first column of the photodiode (112) is arranged between the first column of the light-emitting diode (111a) and the second column of the light-emitting diode (111b). [6] A non-invasive optical internal substance detector according to claim 4 or 5, wherein photodiodes (112) of the plurality of photodiodes (112) are arranged in the predetermined column direction (D1) to form a second column of the photodiode (112), and the first column of the light-emitting diode (111a) and the second column of the light-emitting diode (111b) are alternately arranged between the first and second columns of the photodiode (112). [7] A non-invasive optical detector for internal substances according to any preceding claim, further comprising: a lens array (120) disposed on one side of the diode array (110) and configured to converge the light emitted by the plurality of light-emitting diodes (111a, 111b) and the light incident on the plurality of photodiodes (112). [8] The non-invasive optical internal substance detector according to claim 7, wherein the lens array (120) comprises a plurality of microlenses (121), and a number of microlenses (121) among the plurality of microlenses (121) is determined based on a number of light-emitting diodes (111a, 111b) among the plurality of light-emitting diodes (111a, 111b) and a number of photodiodes (112) among the plurality of photodiodes (112), such that the microlenses (121) cover corresponding light-emitting diodes (111a, 111b) or photodiodes (112), respectively. [9] A non-invasive optical internal substance detector according to claim 8, wherein each of said plurality of microlenses (121) has a convex shape toward the other side opposite to said one side facing said plurality of light-emitting diodes (111a, 111b) and said plurality of photodiodes (112). [10] A non-invasive optical detector for internal substances according to any preceding claim, further comprising: a cooler (150) configured to cool the substrate (140) and arranged on the other side opposite the one side of the substrate (140) on which the diode arrangement (110) and the controller (130) are arranged. [11] Non-invasive optical detector for internal substances, comprising: a diode arrangement (110) which: a plurality of light-emitting diodes (111a, 111b) configured to emit light to a target having an internal substance to be detected, a plurality of photodiodes (112) configured to receive light reflected from the target after it has been emitted by the plurality of light-emitting diodes (111a, 111b); a lens arrangement (120) arranged on one side of the diode arrangement (110) and configured to converge the light emitted by the plurality of light-emitting diodes (111a, 111b) and the light incident on the plurality of photodiodes (112), a controller (130) configured to control light-emitting diodes (111a, 111b) of the plurality of light-emitting diodes (111a, 111b) to be turned on or off, and to process a signal received from photodiodes (112) of the plurality of photodiodes (112), and a substrate (140) in which the diode arrangement (110) and the controller (130) are arranged, characterized by , that the substrate (140) has a first region (141) and a second region (142) with a lower thermal conductivity than the first region (141), and the diode arrangement (110) is arranged on the first region (141) of the substrate (140) and the controller (130) is arranged on the second region (142) of the substrate (140).

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