Ambient light detector and induction lighting device with same

Abstract

The invention relates to the technical field of induction lamps, and discloses an ambient light detector and an induction lighting device with the same. The ambient light detector comprises a light condensation piece which is a reflection cup, the concave face of the reflection cup is a reflection face, and the edge of the large opening end of the reflection cup is parallel to the main shaft of the reflection cup; and the light sensation receiving piece is installed at the small end of the reflection cup, and the light receiving face of the light sensation receiving piece faces the reflection cup. Through the cooperation of the light condensing part and the light sensation receiving part, light in a detection angle can be converged and enhanced, light outside a detection range can be automatically shielded and is not received, and a clear detection boundary can be realized. The light sensation receiving part receives the light signals which are converged and enhanced and have clear boundaries in a large-angle range, so that the light change of the external environment can be accurately detected, and the environment error when the light intensity of the lamp is adjusted according to the light signals received by the light sensation receiving part is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of induction lamps, and in particular to an ambient light detector and an induction lighting device having the same. Background Art

[0002] An ambient light sensor is a device that senses the intensity of surrounding light and is usually used to adjust the display brightness of a device to enhance the user experience. Common application scenarios include brightness adjustment on displays such as smartphones, tablets, and laptops. In addition, in e-readers and TVs, ambient light sensors can also be used to adjust the screen color temperature for a more comfortable reading or viewing experience.

[0003] In indoor lighting systems, ambient light sensors can detect the brightness of the surrounding environment, thereby controlling indoor lighting and achieving automatic lighting adjustment. With the development of ambient light sensors, their size is getting smaller and smaller. When used in indoor lighting systems, the area of ​​ambient light that can be collected is smaller. Indoor ambient light includes not only the light emitted by lamps, but also natural light such as sunlight and the reflection of bright objects. Due to the narrow detection area of ​​ambient light sensors, when they are used in large spaces such as indoor lighting systems, the error of the collected light signal is relatively large. In actual operation, when the object emits strong light, the ambient light sensor may guide the lamp to turn off or dim the lamp by mistake, causing the overall ambient light in public places to be dim, affecting the normal activities of people in public places. Summary of the invention

[0004] In view of this, the present invention provides an ambient light detector and an induction lighting device having the same, so as to solve the problem in the prior art that when an object emits strong light, the collected signal of the ambient light detector will cause the lamp to be mistakenly shut down or dimmed, resulting in the overall dimming of the ambient light in public places, affecting the normal activities of people in public places.

[0005] In a first aspect, the present invention provides an ambient light detector, comprising:

[0006] The light concentrating part is a reflective cup, the concave side of the reflective cup is a reflective surface, and the edge of the large mouth of the reflective cup is parallel to the main axis of the reflective cup;

[0007] The light-sensing receiving element is installed at the small end of the reflective cup, and the light-receiving surface of the light-sensing receiving element is arranged toward the reflective cup.

[0008] When performing ambient light detection, the light is focused by the focusing element and then irradiated onto the photosensitive receiving element. In order to obtain the maximum angle of the incident light and the maximum ambient light detection range, the edge of the large end of the reflective cup as the focusing element is parallel to the main axis of the reflective cup, ensuring that the light incident on the edge of the large end of the reflective cup within the preset detection range can still be reflected onto the photosensitive receiving element. The light outside the preset detection range is reflected outside the photosensitive receiving element after being focused by the focusing cup and will not be received. Through the cooperation of the focusing element and the photosensitive receiving element, the light within the detection angle can be focused and enhanced, and the light outside the detection range can be automatically shielded and not received, so that a clear detection boundary can be achieved. The photosensitive receiving element can accurately detect changes in external ambient light by receiving the light signal within a large angle range that has been focused, enhanced and has clear boundaries, greatly reducing the environmental error when the lamp adjusts the brightness according to the light signal received by the photosensitive receiving element.

[0009] In an optional embodiment, the light-collecting element is a light-collecting lens, the light-sensing receiving element is installed at or near the focus of the light-collecting lens, and the light-receiving surface of the light-sensing receiving element is arranged toward the light-collecting lens;

[0010] The relationship between the width of the light receiving surface, the focal length of the condenser lens, and the angle between the incident light and the principal axis of the condenser lens is:

[0011]

[0012] Where: a is the width of the light receiving surface, f is the focal length of the focusing lens, and ω is the angle between the incident light and the principal axis of the focusing lens.

[0013] When performing ambient light detection, the light is focused by the focusing element and then irradiated onto the photosensitive receiving element. In order to obtain the maximum angle of the incident light and the maximum ambient light detection range, the focal length of the focusing lens is controlled to ensure that the incident light within the preset detection range can be directed onto the photosensitive receiving element after being focused by the focusing lens. Light outside the preset detection range will be directed outside the photosensitive receiving element after being focused by the focusing lens and will not be received. By cooperating with the focusing element and the photosensitive receiving element, the light within the detection angle can be focused and enhanced, and the light outside the detection range can be automatically shielded and not received, so that a clear detection boundary can be achieved. The photosensitive receiving element can accurately detect changes in external ambient light by receiving light signals that have been focused, enhanced, and have clear boundaries within a large angle range, greatly reducing the environmental error when the lamp adjusts the brightness according to the light signals received by the photosensitive receiving element.

[0014] In an optional embodiment, the angle between the reflective surface of the reflective cup and the light receiving surface of the light receiving element is not less than 90°.

[0015] In an optional embodiment, it also includes a mounting bracket, which is conical in shape, and the focusing lens is fixedly mounted on the open end of the mounting bracket, and the focusing lens is fixedly mounted in the inner cavity of the mounting bracket.

[0016] In an optional embodiment, a mounting shell is further included, a light receiving port is provided on the mounting shell, a light receiving element is mounted in the mounting shell, and a light concentrator is mounted on the light receiving port. By mounting the light receiving element in the mounting shell, the light receiving element can only receive light from the light concentrator, thereby reducing the influence of ambient light on the light receiving element and reducing the environmental error of the light receiving element in detecting ambient light.

[0017] In an optional embodiment, a mounting member is pivotally mounted on the mounting shell, and the mounting member is suitable for cooperating with an external mounting component so that the mounting shell can swing around the mounting member after installation, thereby adjusting the orientation of the photosensitive receiving element, thereby changing the light detection area, and facilitating on-site adjustment of the light detection area after the mounting shell is installed in place.

[0018] In an optional implementation, the mounting member and the light receiving port are respectively arranged on two opposite sides of the mounting housing.

[0019] In a second aspect, the present invention further provides an induction lighting device having the ambient light detector of the present invention. Since the induction lighting device includes the ambient light detector, it has the same effect as the ambient light detector, which will not be described in detail here.

[0020] In an optional implementation, it also includes:

[0021] A lighting assembly is electrically connected to the ambient light detector, and the lighting assembly is adapted to adjust brightness according to an ambient light signal detected by the ambient light detector;

[0022] The mounting assembly, the lighting assembly and the ambient light detector are all mounted on the mounting assembly.

[0023] In an optional embodiment, the mounting assembly is a wire trough, and the lighting assembly and the ambient light detector are both fixedly mounted on the wire trough.

[0024] In an optional embodiment, the mounting assembly is a conductive slide rail, and the ambient light detector is slidably mounted on the conductive slide rail. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the structure of an ambient light detector provided by an embodiment of the present invention.

[0027] Figures 2 to 8 A schematic diagram of the design concept of the ambient light detector provided in an embodiment of the present invention.

[0028] Fig. 9 and Fig.10 A schematic diagram of the design concept of an ambient light detector provided by another embodiment of the present invention.

[0029] Fig.11 A schematic diagram of the structure of an induction lighting device provided in an embodiment of the present invention.

[0030] Fig.12 A schematic structural diagram of an induction lighting device provided in another embodiment of the present invention.

[0031] Explanation of the reference numerals: 1. Photosensitive receiving element; 2. Reflective cup; 3. Focusing lens; 4. Mounting bracket; 5. Mounting shell; 6. Mounting piece; 7. Lighting assembly; 8. Wire trough; 9. Conductive slide rail. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0033] Combine the following Figures 1 to 10 , describing an embodiment of the present invention.

[0034] According to an embodiment of the present invention, on the one hand, an ambient light detector is provided, comprising a light collecting element and a light receiving element 1 .

[0035] The focusing element is a reflective cup 2, the concave side of the reflective cup 2 is a reflective surface, and the edge of the large mouth end of the reflective cup 2 is parallel to the main axis of the reflective cup 2. The light receiving element 1 is installed at the small end of the reflective cup 2, and the light receiving surface of the light receiving element 1 is arranged toward the reflective cup 2.

[0036] When performing ambient light detection, the light is focused by the focusing element and then irradiated onto the photosensitive receiving element 1. In order to obtain the maximum angle of the incident light and the maximum ambient light detection range, the edge of the large end of the reflective cup 2 as the focusing element is parallel to the main axis of the reflective cup 2, ensuring that the light incident on the edge of the large end of the reflective cup 2 within the preset detection range can still be reflected onto the photosensitive receiving element 1. The light outside the preset detection range is reflected outside the photosensitive receiving element 1 after being focused by the focusing cup and will not be received. By cooperating with the focusing element and the photosensitive receiving element 1, the light within the detection angle can be focused and enhanced, and the light outside the detection range can be automatically shielded and not received, so that a clear detection boundary can be achieved. The photosensitive receiving element 1 can accurately detect changes in external ambient light by receiving light signals that have been focused, enhanced and have clear boundaries within a large angle range, greatly reducing the environmental error when the lamp adjusts the brightness according to the light signal received by the photosensitive receiving element 1.

[0037] Specifically, the photosensitive receiving element 1 in this embodiment is a diode detector, and the photosensitive receiving element 1 has a small area and cannot fill the entire small opening of the reflective cup 2 like the receiving surface of a traditional compound parabolic concentrator. In order to achieve focusing of the light radiation on the largest possible area, that is, to transmit as much energy as possible to the small opening CD of the reflective cup 2 through the reflective cup 2 to the greatest extent possible. Figures 2 to 4 As shown, in the design, the small end CD of the reflective cup 2 is set as the exit aperture of the device, and reflectors are placed at points A and B. It can start with a simple plane reflector, placing a plane reflector in the horizontal direction of the CD plane and another reflector at point A. Since point O is the midpoint of AB, the photosensitive receiving element 1 is symmetrical about the vertical line passing through point O, and the reflectors on the left and right sides are also symmetrical about the vertical line. In order for the photosensitive receiving element 1 to receive the light deflected to the maximum extent toward CD, the angle β must be as small as possible to make the aperture AB large enough, but there is a limit to the minimum value of angle β, that is, when the light r 1 After A 1 The angle β value when the point is reflected to point D. If the angle β is smaller, the light will pass through AA 1 Reflection to BB 1 Or the bottom surface, and cannot be reflected to the CD area where the photosensitive receiving element 1 is located, and cannot reach the photosensitive receiving element 1. When the first set of reflectors is placed, the second set of reflectors can be placed on it. In this case, the slope of the reflector is selected to maximize the entrance aperture, which means that this reflector must reflect the light r coming from the left side. 2 In A 2Point D is reflected, so that reflectors can be placed one by one upwards. These reflectors have limited sizes and can be made as small as possible, so that we can place more and more small reflectors. These small reflectors tend to a curve together. And the angle between the reflective surface of the reflective cup and the light receiving surface of the photosensitive receiving element is not less than 90°, that is, the angle between the side of the cut surface of the reflective surface of the reflective cup facing the photosensitive receiving element and the light receiving surface of the photosensitive receiving element at any position is an obtuse angle. In order to obtain the maximum angle of the incident light, the edge of the large mouth end of the reflective cup 2 is parallel to the main axis of the reflective cup 2. Figure 5 As shown, when the incident angle is greater than θ max hour( Figure 5 The curve is tilted inward, which makes the incident aperture smaller and the incident aperture area of ​​the reflector smaller. The end of the reflective cup 2 blocks more light, which weakens the light collecting ability of the reflector.

[0038] In summary, if Figures 6 to 8 As shown, when the incident light is along θ max When the incident light is less than θ, part of the light directly hits the photosensitive receiving element 1 or the bottom surface of the reflective cup 2, and the other part of the light is reflected by the reflector and converges to the point D of the photosensitive receiving element 1. max When the incident light is greater than θ, part of the light directly hits the photosensitive receiving element 1 or the bottom surface of the reflective cup 2, and the other part of the light is reflected by the reflector and converges on the photosensitive receiving element 1. max When the incident light is at an angle, no light will be irradiated onto the photosensitive receiving element 1.

[0039] When ambient light detectors are used for crowd sensing, all light within the detection range is required to reach the detector. Changes in crowd flow lead to changes in ambient light. The presence of people and crowd density can be detected based on the changes in detected light, thereby controlling lamps and other equipment.

[0040] In some other embodiments, the light-collecting element may also be a light-collecting lens 3, the light-sensing receiving element 1 is installed at the focus of the light-collecting lens 3 or near the focus of the light-collecting element, and the light-receiving surface of the light-sensing receiving element 1 is arranged toward the light-collecting lens 3;

[0041] The relationship between the width of the light receiving surface, the focal length of the condenser lens 3, and the angle between the incident light and the main axis of the condenser lens 3 is:

[0042]

[0043] Wherein: a is the width of the light receiving surface, f is the focal length of the focusing element, and ω is the angle between the incident light and the main axis of the focusing lens 3.

[0044] When performing ambient light detection, the light is focused by the focusing element and then irradiated onto the photosensitive receiving element 1. In order to obtain the maximum angle of the incident light and the maximum ambient light detection range, the focal length of the focusing lens 3 is controlled to ensure that the incident light within the preset detection range can be directed onto the photosensitive receiving element 1 after being focused by the focusing lens 3. Light outside the preset detection range, after being focused by the focusing lens 3, will be directed outside the photosensitive receiving element 1 and will not be received. By cooperating with the focusing element and the photosensitive receiving element 1, the light within the detection angle can be focused and enhanced, and the light outside the detection range can be automatically shielded and not received, so that a clear detection boundary can be achieved. The photosensitive receiving element 1 can accurately detect changes in external ambient light by receiving light signals within a large angle range that have been focused, enhanced, and have clear boundaries, thereby greatly reducing the environmental error when the lamp adjusts the brightness according to the light signals received by the photosensitive receiving element 1.

[0045] Specifically, the light receiving element 1 in this embodiment also adopts a relatively small diode detector. A certain range of ambient light is focused on the detector through a lens. According to the boundary theory, it is only necessary to project the boundary light from the environment onto the boundary of the detector. Fig. 9 As shown, since the ambient light can be considered as light from infinity relative to the lens, these light rays are incident parallel to the optical axis at a certain angle ω. According to the imaging law of thin lenses, two special light rays are found. One is the light that passes through the object focus and is emitted parallel to the optical axis after passing through the lens. The other is the incident light that passes through the optical center, and the emission direction is the same as the incident direction. According to the fact that these two light rays must intersect at a certain point on the image focal plane, this point is the conjugate image point of the infinity off-axis object point. When the photosensitive receiving element 1 is located on the image focal plane, the relationship between the width a of the light receiving surface, the focal length f of the condenser, and the angle ω between the incident light and the principal axis of the condenser satisfies:

[0046]

[0047] like Fig.10 As shown, when the incident angle is less than ω, the light will still converge on the photosensitive receiving element 1, and when the incident angle is greater than AB, the convergence point is outside the photosensitive receiving element 1. When used for human flow sensing, the light within the detection range needs to pass through the lens to reach the detector, and the incident angle needs to satisfy the convergence point within the photosensitive receiving element 1, that is, satisfy the above formula.

[0048] Furthermore, if Figure 1 As shown, in order to fix the condenser lens 3 and the light receiving element 1 , a conical mounting bracket 4 is provided. The condenser lens 3 is fixedly mounted at the open end of the mounting bracket 4 , and the condenser lens 3 is fixedly mounted in the inner cavity of the mounting bracket 4 .

[0049] In one embodiment, in order to prevent the light outside the surrounding detection range from affecting the light signal received by the photosensitive receiving element 1, a mounting housing 5 is further provided, the mounting housing 5 is provided with a light receiving port, the photosensitive receiving element is installed in the mounting housing 5, and the light collecting element is installed on the light receiving port. By installing the photosensitive receiving element 1 in the mounting housing 5, the photosensitive receiving element 1 can only receive the light source from the light collecting element, which can reduce the influence of the surrounding ambient light on the photosensitive receiving element 1 and reduce the environmental error of the ambient light detection performed by the photosensitive receiving element 1.

[0050] In one embodiment, in order to facilitate the adjustment of the detection area after the ambient light detector is installed, a mounting member 6 is pivotally mounted on the mounting housing 5, and the mounting member 6 is suitable for being connected with an external mounting component, so that the mounting housing 5 can swing around the mounting member 6 after installation, thereby adjusting the orientation of the light receiving member 1, thereby changing the light detection area, and facilitating in-situ adjustment of the light detection area after the mounting housing 5 is installed in place. Specifically, the mounting member 6 and the light receiving port are respectively arranged on opposite sides of the mounting housing 5, so that the orientation of the light receiving port can be adjusted by swinging the mounting housing 5, thereby changing the detection area of ​​the light receiving member 1.

[0051] In order to convert the optical signal received by the photosensitive receiving element 1 into an electrical signal, a photoelectric conversion circuit board is also installed in the installation housing 5, on which a photoelectric conversion circuit is arranged. The optical signal collected by the photosensitive receiving element 1 is converted into a voltage signal through the sampling resistor R1, and then the power frequency interference is filtered out through the subsequent 100HZ trap circuit, and a voltage signal that changes with the light intensity within the detection range can be obtained at the OUT point. After passing through a two-stage resistor-capacitor (RC) filter circuit to filter out high-frequency signals, a smooth DC signal can be obtained at point A to reflect the average illumination of the current environment.

[0052] According to an embodiment of the present invention, on the other hand, an induction lighting device is also provided, which has the ambient light detector of the present invention. It also includes a lighting component 7 and a mounting component. The lighting component 7 is electrically connected to the ambient light detector, and the lighting component 7 is suitable for adjusting the brightness according to the ambient light signal detected by the ambient light detector. The lighting component 7 and the ambient light detector are both mounted on the mounting component. The lighting component 7 can be any lamp such as an LED lamp, a fluorescent lamp, an ultraviolet lamp, a full-spectrum lamp, etc. In this embodiment, Fig.11 As shown, the mounting assembly is a wire groove 8, and the lighting assembly 7 and the ambient light detector are both fixedly mounted on the wire groove 8. In some other embodiments, such as Fig.12 As shown, the mounting assembly may also be a conductive slide rail 9, and the ambient light detector is slidably mounted on the conductive slide rail 9, so that the ambient light detector can adjust the detection area in the horizontal direction.

[0053] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An ambient light detector, characterized in that: include: The light concentrating member is a reflective cup (2), the concave side of the reflective cup (2) is a reflective surface, and the edge of the large mouth end of the reflective cup (2) is parallel to the main axis of the reflective cup (2); A light receiving element (1) is mounted on the small end of the reflective cup (2), and a light receiving surface of the light receiving element (1) is arranged toward the reflective cup (2); or, The light-collecting element is a light-collecting lens (3), the light-sensitive receiving element (1) is installed at the focus of the light-collecting lens (3) or near the focus of the light-collecting lens (3), and the light-receiving surface of the light-sensitive receiving element (1) is arranged toward the light-collecting lens (3); The relationship between the width of the light receiving surface, the focal length of the condenser lens (3), and the angle between the incident light and the main axis of the condenser lens (3) is: Wherein: a is the width of the light receiving surface, f is the focal length of the condenser lens (3), and ω is the angle between the incident light and the main axis of the condenser lens (3).

2. The ambient light detector according to claim 1, characterized in that The angle between the reflective surface of the reflective cup (2) and the light receiving surface of the light receiving element (1) is not less than 90°.

3. The ambient light detector according to claim 1, characterized in that It also comprises a mounting bracket (4) which is conical in shape, the condenser lens (3) being fixedly mounted on the open end of the mounting bracket (4), and the condenser lens (3) being fixedly mounted in the inner cavity of the mounting bracket (4).

4. The ambient light detector according to any one of claims 1 to 3, characterized in that: It also comprises a mounting shell (5), the mounting shell (5) being provided with a light receiving port, the light receiving element being mounted in the mounting shell (5), and the light focusing element being mounted on the light receiving port.

5. The ambient light detector according to claim 4, characterized in that: A mounting member (6) is pivotally mounted on the mounting shell (5), and the mounting member (6) is suitable for being connected with an external mounting component.

6. The ambient light detector according to claim 5, characterized in that The mounting member (6) and the light receiving port are respectively arranged on two opposite sides of the mounting shell (5).

7. An induction lighting device, characterized in that: An ambient light detector according to any one of claims 1 to 6.

8. The induction lighting device according to claim 7, characterized in that: Also includes: an illumination component (7), electrically connected to the ambient light detector, the illumination component (7) being adapted to adjust brightness according to an ambient light signal detected by the ambient light detector; A mounting assembly, wherein the lighting assembly (7) and the ambient light detector are both mounted on the mounting assembly.

9. The induction lighting device according to claim 8, characterized in that: The installation component is a wire trough (8), and the lighting component (7) and the ambient light detector are both fixedly installed on the wire trough (8).

10. The induction lighting device according to claim 8, characterized in that: The mounting assembly is a conductive slide rail (9), and the ambient light detector is slidably mounted on the conductive slide rail (9).

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