Adjustable sensitivity light-emitting device and curing device using the light-emitting device

Abstract

A light-emitting device capable of real-time control of the light output of a light-emitting part and a curing apparatus employing the light-emitting device are disclosed. The light-emitting device disclosed herein may include: a main body having a viewing window; a light-emitting part installed within the main body and generating light of a predetermined wavelength, and equipped with a light source that illuminates the generated light through the viewing window to the outside of the main body; a photodetector installed within the main body adjacent to the light source, and receiving light reflected from the main body after being illuminated by the light-emitting part, thereby monitoring the sensitivity of the light-emitting part; and a sensitivity adjustment unit that adjusts the sensitivity of the light-emitting part based on the signal detected by the photodetector.

Description

Technical Field

[0001] The present invention relates to a light-emitting device that irradiates light of a specified wavelength and a curing apparatus using the light-emitting device, and more specifically to a light-emitting device with adjustable sensitivity that allows real-time control of the light output of the light-emitting part and a curing apparatus using the light-emitting device. Background Technology

[0002] Typically, a light-emitting device has a light source that illuminates light of a specified wavelength, and can be distinguished according to the wavelength of the illuminating light or the type of light source.

[0003] The light-emitting device can be divided into lamp-type light-emitting devices and light-emitting diode (LED) type light-emitting devices according to the light source.

[0004] Lamp-type light-emitting devices use lamps such as mercury lamps or metal lamps that emit inherent wavelengths as light sources. These devices are relatively inexpensive and can generate light with a wide bandwidth, ranging from short to long wavelengths. However, they also have disadvantages such as difficulty in compact construction, short lamp life, and the potential for thermal damage to surrounding structures due to the heat generated.

[0005] The disadvantages of LED-type lighting devices are that they are more expensive and less heat-resistant compared to lamp-type devices. Conversely, the advantages of LED-type lighting devices are that they can be compactly designed due to the use of LED light sources, LEDs have a much longer lifespan than lamps, they emit almost no heat because they emit a single wavelength of light, and they can emit high-power light, especially ultraviolet light. Therefore, LED-type lighting devices are gradually expanding their market influence.

[0006] In this LED-type light-emitting device, it is required to maintain a stable light output from the LED light source. On the other hand, due to temperature changes caused by heat generation or aging of the LED light source due to prolonged use, the light output and center wavelength may change. Therefore, this LED-type light-emitting device requires a technology to maintain a constant light output and center wavelength through real-time feedback control of the LED.

[0007] This LED lighting device can be divided into lighting and sterilization types depending on its application. When used for lighting, if the lighting function is lost, safety issues may arise.

[0008] When used for sterilization, the LED-type light-emitting device illuminates light of ultraviolet wavelengths. This sterilization LED-type light-emitting device is manufactured to prevent harmful ultraviolet light from escaping. Therefore, when the light-emitting device malfunctions, it cannot be detected by the naked eye; thus, a technology is needed that can sense and confirm whether the LED is malfunctioning through real-time feedback. Summary of the Invention

[0009] The present invention was made in view of the problems mentioned above, and its object is to provide a light-emitting device that can confirm whether a light source is abnormal and a curing device using the light-emitting device, which monitors the light output of the light source in real time and, based on this, keeps the light output and center wavelength of the light source constant.

[0010] To achieve the above objectives, the light-emitting device according to the present invention may include: a main body having a window; a light-emitting part installed inside the main body and generating light of a predetermined wavelength, illuminating the generated light to the outside of the main body through the window; a photodetector installed inside the main body adjacent to the light source and receiving light reflected from the main body after being irradiated by the light-emitting part, thereby monitoring the sensitivity of the light-emitting part; and a sensitivity adjustment part adjusting the sensitivity of the light-emitting part based on the signal detected by the photodetector.

[0011] Here, the photodetector is positioned at a distance C2 from the center of the light source, and the distance C2 satisfies condition 1, so that external light Le incident from outside the body will not be incident on the photodetector.

[0012] [Conditional expression 1]

[0013]

[0014] Here, C2 is the distance between the center of the light-emitting part and the light detector on the plane P extending from the light-receiving surface of the light detector, and D is the diameter of the window, A is the distance between the plane P and the outer side of the main body, and B is the distance between the plane P and the inner side of the main body.

[0015] Furthermore, the interval between the light-emitting part and the photodetector is fixedly configured as an arbitrary interval W, and the interval A between the plane P extending from the light-receiving surface of the photodetector and the outer surface of the main body can satisfy condition 2.

[0016] [Conditional expression 2]

[0017]

[0018] Here, D is the diameter of the window, and B is the distance between plane P and the inner surface of the body.

[0019] In addition, the present invention also includes an optical component mounted on a window, which allows light irradiated from the light source to pass through at a predetermined magnification, and a portion of the light irradiated from the light source can be reflected from the incident surface of the optical component.

[0020] Additionally, the light-emitting device according to the present invention may include: a main body having a window; a light source installed inside the main body and generating light of a predetermined wavelength, illuminating the generated light to the outside of the main body through the window; a photodetector installed inside the main body adjacent to the light source and receiving light reflected from the main body after being irradiated by the light-emitting part, thereby monitoring the sensitivity of the light-emitting part; a sensitivity adjustment unit that adjusts the sensitivity of the light-emitting part based on the signal detected by the photodetector; a transparent optical component having a refractive index n2 installed in the window, allowing light irradiated from the light source to pass through at a predetermined magnification; and a light-shielding part having an opening of diameter D' formed coaxially on the window and being made of an opaque material having a thickness T, thereby blocking external light from entering the interior of the main body through the window.

[0021] The thickness T of the light-shielding part can satisfy condition 3.

[0022] [Conditional expression 3]

[0023]

[0024] Here, A is the distance between the incident plane of the photodetector and the outer surface of the main body, B is the distance between the incident plane of the photodetector and the inner surface of the main body, and D is the diameter of the window.

[0025] The refractive index n2 of optical components can be above 1 and below 1.7.

[0026] In addition, the light-emitting device according to the present invention may also include a filter component, which is installed on the light path incident on the photodetector and filters the light so that light of a specified wavelength is directed toward the photodetector.

[0027] In addition, the light-emitting device according to the invention also includes a reflective surface formed on the inner side of the window, so that incident light is reflected to the photodetector, and a groove is formed in the reflective surface so that the reflection angle of the reflected light can be changed.

[0028] In addition, to achieve the above objectives, the curing apparatus according to the present invention may include: the light-emitting device described above; and a control unit, which is installed outside the main body and controls the light-emitting unit and the photodetector respectively according to the curing conditions.

[0029] The light-emitting device according to the present invention can monitor the light output of a light source irradiating a specified wavelength in real time using a photodetector and control it using a sensitivity adjustment unit. Therefore, the light-emitting device according to the present invention can maintain the light output of the light source within a certain range even when environmental changes occur due to temperature, aging caused by prolonged use of the light source, etc.

[0030] In addition, the light-emitting device according to the present invention can optimize the configuration of the light source, the photodetector and the window, thereby preventing external light from incident on the photodetector.

[0031] Furthermore, the curing apparatus according to the present invention employs the aforementioned light-emitting device, thereby enabling precise control of the light output of the irradiation light source while simultaneously confirming any abnormalities. Therefore, it has the advantage of providing illumination light of an intensity matching the device's light output conditions, and the ability to confirm in real-time any safety or functional malfunctions of the device caused by abnormal illumination light. Attached Figure Description

[0032] Figure 1 This is a schematic diagram illustrating a light-emitting device according to a first embodiment of the present invention.

[0033] Figure 2 It is shown in Figure 1 The diagram shows an example of external light entering the photodetector through the main body's window when the device has no transparent components.

[0034] Figure 3 This is a schematic diagram illustrating a modified example of a light-emitting device according to a first embodiment of the present invention.

[0035] Figure 4 This is a schematic diagram illustrating another variation of the light-emitting device according to the first embodiment of the present invention. Figure 5 yes Figure 4 Enlarged view of the V section.

[0036] Figure 6 It shows when in Figure 2 The path of external light when an optical component with a refractive index n2 is installed in the window.

[0037] Figure 7 This is a schematic diagram illustrating a light-emitting device according to a second embodiment of the present invention.

[0038] Figure 8 This is a graph showing the relationship between the T value and the incident light quantity (normalization) as the refractive index n2 increases by 0.1 from 1.0 to 1.8.

[0039] Figure 9 This is a graph showing the relationship between the T / D value and the incident light quantity (normalized) when the refractive index n2 is 1.7.

[0040] Figure 10 This is a block diagram schematically illustrating a curing apparatus employing a light-emitting device according to an embodiment of the present invention. Detailed Implementation

[0041] Hereinafter, with reference to the accompanying drawings, a light-emitting device with adjustable sensitivity according to an embodiment of the present invention and a curing apparatus employing the light-emitting device will be described in detail. Parts unrelated to the description have been omitted for clarity of the invention in the drawings, and the same reference numerals will be used for the same or similar components throughout the specification.

[0042] Figure 1 This is a schematic diagram illustrating a light-emitting device according to a first embodiment of the present invention.

[0043] Reference Figure 1 According to the first embodiment of the present invention, the light-emitting device may include a main body 201, a light-emitting part 210 disposed in the main body 201, a photodetector 221, and a sensitivity adjustment part 240.

[0044] The main body 201 refers to the outer shell, which can be deformed and formed into various shapes depending on the application. For example, the main body 201 can be constructed from a cylinder with a diameter of approximately 10 mm. Alternatively, the main body 201 can also have an expanded aperture shape so that multiple light-emitting portions 210 can be included internally. The main body 201 includes a window 201a for emitting light from the light-emitting portions 210. Optical components 215, described later, can be mounted on this window 201a.

[0045] The light-emitting part 210 is installed inside the main body 201 to generate and irradiate light of a specified wavelength. For this purpose, the light-emitting part 210 may include a light source 211 for generating and irradiating light and an optical component 215.

[0046] The light source 211 can be made of semiconductor LEDs. For example, the light source 211 can be made of chip-on-board (COB) or surface-mount device (SMD) LEDs with LED chips mounted on a substrate. The wavelength of the light emitted from the light source 11 can be set in various ways depending on the application.

[0047] In addition, light source 211 can irradiate light of ultraviolet wavelengths. Ultraviolet light (hereinafter referred to as "UV"), with a wavelength range of 10–400 nm (energy range of 3 eV–124 eV), is a general term for electromagnetic waves with wavelengths shorter than visible light and longer than X-rays. UV photons have high energy and, when absorbed by matter, possess the chemical property of breaking molecular bonds, thus exhibiting unique bactericidal and photochemical reactions. Therefore, UV irradiation devices are used in many technical fields such as industry, medicine, and beauty. For example, UV irradiation devices can be applied to equipment that uses the photochemical reaction of UV to harden liquid paints, inks, adhesives, etc., i.e., UV curing devices.

[0048] Optical component 215 is mounted on window 201a and functions as a transparent window that allows light to pass through to the outside of body 201. In other words, optical component 215 transmits most of the light Lm from light source 211 at a predetermined magnification. This optical component 215 can be configured as a lens with positive (+) refractive power and a lens with negative (-) refractive power, as per the application of the light-emitting device according to the invention.

[0049] In this embodiment, although a flat transparent component is shown as an example of an optical component, it is not limited to this and can be modified into various other examples such as a convex lens structure that focuses the illumination light.

[0050] Additionally, a reflective surface 205 may be formed on the inner surface of the main body 201 around the viewing window 201a. The reflective surface 205 is coated with a total internal reflection coating so that the incident light can be totally reflected, or the main body 201 may be configured to be made of glass material and the incident light may be at an angle greater than the critical angle, thereby achieving total internal reflection. Alternatively, the reflective surface 205 may be formed to diffusely reflect the incident light. Therefore, a portion of the light Lr irradiated from the light-emitting part 210 is incident on the reflective surface 205, and after total internal reflection or even diffuse reflection from the reflective surface 205, it is directed toward the photodetector 221.

[0051] A photodetector 221 is installed inside the main body 201 and arranged adjacent to the light source 211. The photodetector 221 receives light irradiated from the light source 211 and reflected from the reflective surface 205 of the main body 201, thereby monitoring the light output of the light source 221. As a photoelectric conversion element, the photodetector 221 transmits an electrical signal corresponding to the amount of received light to the sensitivity adjustment unit 240.

[0052] The sensitivity adjustment unit 240 adjusts the sensitivity of the light source 211 based on the signal detected by the photodetector 221. This sensitivity adjustment unit 240 adjusts the sensitivity of the light source 211 based on the signal detected by the photodetector 221, and also checks whether the light-emitting device is malfunctioning. In other words, the sensitivity adjustment unit 240 controls the light source 211 such that when the light output of the light source 211 is less than a standard value, the power (voltage or current) applied to the light source 211 is increased, and when it exceeds the standard value, the power applied to the light source 211 is decreased. Furthermore, the sensitivity adjustment unit 240 can send a signal to the outside even when there is no light output from the light source 211, in order to confirm whether there is a malfunction.

[0053] Additionally, the light-emitting device according to the present invention may further include a filter component 225 disposed between the reflective surface 205 of the main body 201 and the photodetector 221. The filter component 225 allows light of a predetermined wavelength to pass through while filtering light other than that reflected from the light source 211. As described above, by including the filter component 225 to filter peripheral light other than that irradiated by the light source 211 incident on the photodetector 221, the present invention can improve the accuracy of monitoring the light output of the light source 221.

[0054] With the configuration described above, the light-emitting device according to the first embodiment of the present invention can monitor the light output of the light source 211 irradiating light of a predetermined wavelength in real time while controlling it via the sensitivity adjustment unit 240. Therefore, even when environmental changes occur due to temperature, aging caused by prolonged use of the light source, or other environmental changes, the light output of the light source 211 can be maintained within a certain range. Furthermore, when the light source 211 malfunctions, it can be confirmed by sending a signal to the outside.

[0055] On the other hand, in the case of the configuration described above, such as Figure 2 As shown, light Le incident from outside the main body 201 can enter the interior of the main body 201 through the viewing window 201a. At this time, when the photodetector 221 is positioned on the path of the external light Le incident into the interior of the main body 201 (e.g., Figure 2 As shown, when the photodetector 221 is positioned at a center distance C from the light-emitting unit 210, it receives noise light. Therefore, it may be difficult to determine whether the light source has malfunctioned and to control the light output of the light source.

[0056] The light-emitting device according to this embodiment is characterized in that, taking into account the above-mentioned problems, the configuration of the constituent elements is optimized in order to prevent external light Le from incident on the photodetector 221.

[0057] Figure 3 This is a diagram illustrating a modified example of a light-emitting device according to a first embodiment of the present invention.

[0058] Reference Figure 3 Light Le incident from outside the main body 201 can enter the interior of the main body 201 through the viewing window 201a. Here, when observing the incident position of the external light Le on the plane P extending from the light-receiving surface of the photodetector 221, the external light Le can enter from the center of the light-emitting part 210 to the position of interval C1. In other words, the external light Le enters through the entire viewing window 201a and is confined within the viewing window 201a to enter the interior of the main body 201. Therefore, the external light Le cannot reach the position where it leaves the position of interval C1 from the center of the light-emitting part 210. Here, interval C1 is determined by the diameter D of the viewing window 201a, the interval A between the plane P and the outer surface of the main body 201, and the interval B between the plane P and the inner surface of the main body 201.

[0059] With this in mind, the photodetector 221 can be configured at a position away from where the external light Le reaches. In other words, the photodetector 221 can be configured at a distance C2 (C2 > C1) from the center of the light-emitting part 210. In other words, the distance C2 can satisfy the following condition 1.

[0060] [Conditional expression 1]

[0061]

[0062] Here, C2 refers to the interval between the center of the light-emitting part 210 on plane P and the photodetector 221.

[0063] By satisfying the conditions described above, external light L can be prevented from incident on the photodetector 221.

[0064] Furthermore, in this embodiment, when the photodetector 221 is disposed within the main body 201, the interval between the light-emitting part 210 and the photodetector 221 can be fixed at an arbitrary interval W. In this case, as a temporary measure to prevent external light Le from incident on the photodetector 221, the interval A between the plane P and the outer surface of the main body 201 can be set to satisfy the following condition 2.

[0065] [Conditional expression 2]

[0066]

[0067] Figure 4 This is a diagram illustrating another variation of the light-emitting device according to the first embodiment. Figure 5 yes Figure 4 Enlarged view of the V section.

[0068] First, such as Figure 2 and Figure 3 As shown, when the reflective surface 205 of the main body 201 is formed into a flat plate shape, the light reflected from the light source 211 and the reflective surface 205 can be reduced to reach the photodetector 221. On the other hand, since the light travel path is specific, the photodetector 221 can only be positioned at position C2. Furthermore, when diffuse reflection is applied to the reflective surface, the position of the photodetector can be adjusted arbitrarily, but light loss to the photodetector may occur, resulting in a decrease in light intensity.

[0069] The light-emitting device according to this modification is characterized in that, taking into account the above-mentioned points, such as Figure 4 As shown, the deformable reflective surface 205' increases the configuration freedom of the photodetector 221'. In other words, the reflective surface 205' performs specular reflection, and a groove is formed in the reflected portion, thereby changing the reflection angle of the reflected light. Figure 5As shown, by forming the reflective surface 205' into a groove with a "V" shaped cross-section, the light irradiated from the light source 211 can be directed toward the photodetector 221' located at position C3, instead of as... Figure 8 The position of the photodetector 221 is shown. Here, position C3 refers to the distance between the photodetector 221' and the center of the light source 211, which is a shorter position compared to position C2.

[0070] In this embodiment, although a "V" shaped groove is used as an example, it is not limited to this and can be formed into various shapes that can change the light reflection path.

[0071] Figure 6 It shows when in such Figure 2 The light path of external light Le when an optical component 215 with a refractive index n2 is installed in the window 201a formed on the main body 201.

[0072] Reference Figure 6 Without the optical component 215, external light Le is incident along the path shown by the dashed arrow, and thus will hit the side wall of the window 201a of the main body 201, without reaching the photodetector 221. Therefore, external noise light will not be incident on the photodetector 221. On the other hand, when the transparent optical component 215 is installed to protect the interior of the main body 201, external light Le incident at an incident angle α is refracted on the incident surface of the optical component 215, and after being refracted at an exit angle β, it can be incident on the photodetector 221 installed inside the main body 201.

[0073] Figure 7 This is a schematic diagram illustrating a light-emitting device according to a second embodiment of the present invention. (Refer to...) Figure 7 The light-emitting device according to a second embodiment of the present invention may include a main body 201, a light-emitting part 210 disposed within the main body 201, a light detector 221, and a light-shielding part 250. A window 201a is formed in the main body 201 for emitting light from the light source 211 of the light-emitting part 210, and an optical component 215 is mounted within the window 201a. When the optical component 215 as described above is used, the light-shielding part 250 blocks external light from traveling to the light detector 221. The light-shielding part 250 has an opening of coaxial diameter D' formed in the window 201a. The light-shielding part 250 is made of an opaque material having a thickness T, and depending on its mechanical shape and arrangement, blocks light from passing through the light detector 221. Figure 7 External light Le, incident along the same path, enters the viewing window 201a. As described above, a light shield 250 is installed to block external light Le from entering the photodetector 221.

[0074] In order to provide light shading according to the mechanical shape and configuration of the light-shielding part 250, the thickness T of the light-shielding part 250 can satisfy the following condition Equation 3.

[0075] [Conditional expression 3]

[0076]

[0077] Here, A is the distance between the incident plane of the photodetector 221 and the outer surface of the main body 201, B is the distance between the incident plane of the photodetector 221 and the inner surface of the main body 201, D is the diameter of the window 201a, and n2 is the refractive index of the optical component 215.

[0078] Furthermore, the optical component 215 may be made of a transparent material having a refractive index n2 of 1 to 1.7. The refractive index n2 is determined by reflecting the following simulation results.

[0079] Figure 8 This is a graph showing the relationship between the T value and the incident light quantity (normalized) as the refractive index n2 increases by 0.1 from 1.0 to 1.8. Figure 9 This is a graph showing the relationship between the T / D value and the incident light quantity (normalized) when the refractive index n2 is 1.7.

[0080] Reference Figure 8 Under the same T value, the incident light intensity increases with the increase of the refractive index n2. On the other hand, structurally, the thickness T of the light-emitting device should be smaller than the diameter D of the main body's window. (Refer to...) Figure 9 The maximum refractive index n2 that satisfies the condition of T / D being less than 1 is 1.7. Taking this into consideration, the refractive index n2 of optical components can be set to be above 1 and below 1.7.

[0081] Figure 10 This is a block diagram schematically illustrating a curing apparatus employing a light-emitting device according to an embodiment of the present invention. (Refer to...) Figure 10 The curing apparatus according to the present invention includes the aforementioned light-emitting device and control unit 50. The light-emitting device includes a main body 201, a light-emitting part 210 mounted within the main body 201, a photodetector 221, and a sensitivity adjustment unit 240. This light-emitting device is consistent with a reference... Figures 1 to 8 The light-emitting device described in this embodiment of the invention is substantially the same, therefore its detailed description is omitted. The control unit 250 is mounted on the outside of the main body 201 and controls the light-emitting unit 210 and the photodetector 221 respectively according to the curing conditions.

[0082] The above embodiments are merely exemplary, and any person skilled in the art can make various modifications and equivalent embodiments accordingly. Therefore, the true scope of protection of this invention must be determined by the inventive concept described in the claims.

Claims

1. A light-emitting device, characterized in that, include: The main body, which has a viewport; The light-emitting part is installed inside the main body and generates light of a specified wavelength, and has the function of illuminating the generated light to the outside of the main body through a viewing window; A photodetector is installed inside the main body adjacent to the light source and receives light reflected from the main body after being illuminated by the light-emitting part, thereby monitoring the sensitivity of the light-emitting part; The sensitivity adjustment unit adjusts the sensitivity of the light-emitting unit based on the signal detected by the photodetector. The photodetector is positioned at a distance C2 from the center of the light source, and distance C2 satisfies condition 1, thereby preventing external light (Le) incident from outside the subject from reaching the photodetector. [Conditional expression 1] Here, C2 is the distance between the center of the light-emitting part and the light detector on the plane (P) extending from the light-receiving surface of the light detector, and D is the diameter of the window, A is the distance between the plane (P) and the outer side of the main body, and B is the distance between the plane (P) and the inner side of the main body.

2. The light-emitting device according to claim 1, characterized in that, Also includes: Optical components, mounted on the viewing window, allow light from the light source to pass through at a specified magnification. A portion of the light emanating from the light source is reflected from the incident surface of the optical component towards the light detector.

3. A light-emitting device, characterized in that, include: The main body, which has a viewport; The light-emitting part is installed inside the main body and generates light of a specified wavelength, and has the function of illuminating the generated light to the outside of the main body through a viewing window; A photodetector is installed inside the main body adjacent to the light source and receives light reflected from the main body after being illuminated by the light-emitting part, thereby monitoring the sensitivity of the light-emitting part; The sensitivity adjustment unit adjusts the sensitivity of the light-emitting unit based on the signal detected by the photodetector. The spacing between the light-emitting part and the photodetector is fixedly configured to be an arbitrary spacing (W). The distance A between the plane (P) extending from the light-receiving surface of the photodetector and the outer surface of the main body satisfies condition 2. [Condition 2] Here, D is the diameter of the window, and B is the distance between the plane (P) and the inner surface of the body.

4. The light-emitting device according to claim 3, characterized in that, Also includes: Optical components, mounted on the viewing window, allow light from the light source to pass through at a specified magnification. A portion of the light emitted from the light source is reflected from the incident surface of the optical component towards the light detector.

5. A light-emitting device, characterized in that, include: The main body, which has a viewport; The light-emitting part is installed inside the main body and generates light of a specified wavelength, and has the function of illuminating the generated light to the outside of the main body through a viewing window; A photodetector is installed inside the main body adjacent to the light source and receives light reflected from the main body after being illuminated by the light-emitting part, thereby monitoring the sensitivity of the light-emitting part; The sensitivity adjustment unit adjusts the sensitivity of the light-emitting unit based on the signal detected by the photodetector; A transparent optical component with a refractive index of n2 is mounted on a viewing window, and allows most of the light incident from the light source to pass through at a specified magnification. The light-blocking part has a coaxially oriented opening of diameter D' on the window and is made of an opaque material with a thickness T, thereby blocking external light from entering the interior of the main body through the window.

6. The light-emitting device according to claim 5, characterized in that, The thickness T of the light-shielding part satisfies condition 3. [Conditional expression 3] Here, A is the distance between the incident plane of the photodetector and the outer surface of the main body, B is the distance between the incident plane of the photodetector and the inner surface of the main body, and D is the diameter of the window.

7. The light-emitting device according to claim 6, characterized in that, The refractive index n2 of the optical components is above 1 and below 1.

7.

8. The light-emitting device according to any one of claims 1 to 7, characterized in that, Also includes: A filter component is installed in the path of light incident on the photodetector and filters the light so that light of a specified wavelength is directed toward the photodetector.

9. The light-emitting device according to any one of claims 1 to 7, characterized in that, The photodetector is configured adjacent to the light source. It also includes a reflective surface formed around the window on the inner side of the body, thereby reflecting incident light to the photodetector.

10. The light-emitting device according to claim 9, characterized in that, A groove is formed in the reflective surface to allow for adjustment of the reflection angle of the reflected light.

11. A curing apparatus, characterized in that, include: The light-emitting device according to any one of claims 1 to 7; The control unit is installed on the outside of the main body and controls the light source and photodetector respectively according to the curing conditions.

12. The curing apparatus according to claim 11, characterized in that, The light-emitting device also includes: A filter component is installed in the path of light incident on the photodetector and filters the light so that light of a specified wavelength is directed toward the photodetector.

Images