PIR lens and camera capable of preventing false triggering

Abstract

The utility model discloses a PIR lens and an anti-false-triggering camera, and the PIR lens can effectively filter infrared rays in sunlight and prevent the infrared rays from entering the camera, thereby greatly reducing the possibility of false triggering of equipment caused by sunlight irradiation. The equipment can operate more stably in the use process, the conditions of unnecessary working mode switching, alarming and the like caused by false triggering are reduced, and the reliability of the whole monitoring system is improved. And moreover, the power consumption can be obviously reduced, the endurance time of equipment is prolonged, and the maintenance cost and workload caused by frequent charging or battery replacement are reduced.

Description

Technical Field

[0001] The utility model relates to the field of security, in particular to a PIR lens and a camera with anti-mistriggering function. Background Art

[0002] A low-power battery camera uses a PIR sensor to realize the working mode switching of the device. It detects the infrared radiation change by using the temperature change characteristics to wake up the device. However, the PIR sensor is vulnerable to the temperature change of sunlight, resulting in mistriggering of the device alarm. Frequent mistriggering will not only generate a large number of invalid alarm messages, but also make the device frequently enter unnecessary working states, causing waste of power and seriously affecting the monitoring value of the camera. On the other hand, although the newly emerged AOV low-power battery camera on the market can work continuously for 24 hours, it consumes too much power. In order to ensure the battery life of the device, it is necessary to increase the battery capacity, which undoubtedly increases the cost of the product. Summary of the Utility Model

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a PIR lens that can reflect infrared rays in sunlight, and an anti-mistriggering camera including the PIR lens.

[0004] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0005] A PIR lens includes a lens body and a reflecting surface located on the upper part of the lens body. The surface of the reflecting surface is provided with a reflecting portion that can reflect infrared rays in sunlight, and the reflecting surface is used to filter infrared rays in sunlight.

[0006] Further, the reflecting surface and the lens body are integrally formed.

[0007] Further, the reflecting portion is an irregular geometric pattern, and the pattern is arranged in the reflecting surface.

[0008] Further, the geometric pattern includes one of serrated, wavy or stepped geometric shapes.

[0009] Further, the depth of the geometric pattern is 0.5 - 2 mm.

[0010] Further, the geometric pattern is a continuous line, and the distance between adjacent patterns is 0.1 - 1 mm.

[0011] Further, the surface of the geometric pattern is provided with a metal coating material to form a reflecting surface, and the metal coating material is an aluminum film or a silver film.

[0012] Further, the area of the reflecting surface accounts for 30% - 70% of the upper surface area of the PIR lens.

[0013] Furthermore, the area of the reflective surface accounts for 60% of the upper surface area of the PIR lens.

[0014] A camera that prevents false triggering includes the above-mentioned PIR lens and a PIR probe arranged inside the camera and facing the center of the PIR lens. The PIR lens can filter infrared rays in sunlight and prevent infrared rays from entering the camera to prevent false triggering.

[0015] The beneficial effects of the utility model are:

[0016] The PIR lens of the utility model can effectively filter infrared rays in sunlight and prevent them from entering the camera, greatly reducing the possibility of false triggering of the device due to sunlight. The device can operate more stably during use, reducing unnecessary working mode switching and alarms caused by false triggering, and improving the reliability of the entire monitoring system. It can also significantly reduce power consumption, extend the battery life of the device, and reduce the maintenance cost and workload caused by frequent charging or battery replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a schematic diagram of the assembly of the utility model;

[0019] Figure 2 This is a structural split diagram of the utility model;

[0020] Figure 3 This is a structural breakdown diagram of the second embodiment of the utility model;

[0021] Figure 4 It is an assembly schematic diagram of the second embodiment of the utility model.

[0022] in,

[0023] 1. Shell 1;

[0024] 11. Probe 11; 12. Battery 12; 13. Rotating seat 13; 14. Lens 14;

[0025] 15. Lens body 15;

[0026] 151. Reflective surface 151; 1511. Texture 1511. DETAILED DESCRIPTION

[0027] The concept, specific structure and technical effects of the present utility model will be clearly and completely described below in conjunction with the embodiments and the drawings, so as to fully understand the purpose, features and effects of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present utility model. In addition, all the connection / linkage relationships involved in the patent do not simply refer to the direct connection of components, but refer to the formation of a more optimal connection structure by adding or reducing connection accessories according to the specific implementation situation. Each technical feature in the creation of the present utility model can be interactively combined on the premise of not conflicting with each other.

[0028] An anti-mis-triggering camera includes a PIR lens and a PIR probe 11 disposed at the center of the camera interior opposite to the center of the PIR lens. The PIR lens can filter the infrared rays in sunlight and prevent the infrared rays from entering the interior of the camera to prevent mis-triggering.

[0029] In addition, referring to Figure 1 、 Figure 2 , the camera further includes a housing 1, a lens 14 disposed on the housing 1, a rotating base 13 located on the housing 1, electronic components inside the housing 1, and a battery 12 electrically connected to these electronic components, and the battery 12 provides power for the operation of the camera. Reducing mis-triggering can undoubtedly reduce the startup times of the device and the power consumption of the device. On the premise of not increasing the cost of the battery 12, the battery 12 with the same capacity has a stronger endurance.

[0030] Among them, PIR is a pyroelectric infrared sensor (Passive Infrared Sensor), which is a sensor that can detect the infrared rays emitted by people or animals and output an electrical signal. The human body and other warm-blooded animals can all radiate infrared rays, and the radiation wavelength is mainly concentrated at about 9-10 μm. The pyroelectric element in the PIR pyroelectric infrared sensor can sense this change in infrared radiation. When a person enters or leaves the detection area of the sensor, the intensity of the infrared radiation received by the pyroelectric element will change, resulting in a change in its temperature. According to the pyroelectric effect, the polarization intensity at both ends of the element changes accordingly, thereby generating a weak electrical signal proportional to the rate of temperature change. This weak electrical signal is amplified and signal-conditioned by a field effect transistor (FET) inside the sensor and converted into a voltage signal that can be processed by subsequent circuits (such as a microcontroller, an alarm circuit, etc.), and finally the camera can be controlled to detect human movement.

[0031] The PIR lens is disposed outside the PIR probe 11 and includes a lens body 15 and a reflecting surface 151 on the upper part of the lens body 15. The reflecting surface 151 is used to filter infrared rays in sunlight. By designing the upper part of the PIR lens as the reflecting surface 151, the problem that the existing PIR sensors of cameras are easily mis-triggered by sunlight infrared rays is effectively solved, and the manufacturing cost is not increased. It can effectively avoid the mis-triggering of the camera and save power.

[0032] In some embodiments, referring to Figure 3 , 4 , the reflecting surface 151 and the lens body 15 are integrally formed. By integral molding, the optical transition between the reflecting surface 151 and the lens body 15 can be made smoother and continuous. When light is transmitted from the lens body 15 to the reflecting surface 151, no additional refraction, reflection or scattering will occur due to the interface differences between different components (such as refractive index mismatch, surface flatness inconsistency, etc.), thus ensuring the consistency of the optical path and enabling light to be reflected and refracted along the expected path, improving the focusing and reflection effects of the PIR lens on infrared rays. In the traditional non-integral molding design, when light passes through the interface of different components, a part of the light will be reflected back to the original optical path or absorbed by the interface, resulting in optical loss. The integrally formed reflecting surface 151 and lens body 15 can minimize this loss, enabling more infrared rays to be effectively reflected and utilized, and improving the optical efficiency of the PIR lens.

[0033] The reflection area is set in the upper area of the lens, but the specific proportion needs to be adjusted according to the actual situation. In some embodiments, referring to Figure 4 , the area of the reflecting surface 151 accounts for 30%-70% of the upper surface area of the PIR lens. Such an area range can cover to a large extent the area where sunlight may shine directly. When the sun is at different altitude angles and azimuth angles, this area proportion can ensure that there is enough reflecting surface area 151 to block the infrared rays in sunlight from entering, thus effectively reducing the mis-triggering caused by sun exposure. Preferably, the area of the reflecting surface 151 accounts for 60% of the upper surface area of the PIR lens.

[0034] In some embodiments, irregular geometric patterns 1511 are provided on the PIR lens, and the patterns 1511 are provided within the reflecting surface 151. It can be understood that the geometric texture can be used to reflect infrared rays in sunlight. Specifically, the geometric patterns 1511 include one of serrated, wavy or stepped geometric shapes. The serrated pattern 1511 can form multiple reflecting surfaces 151 to enhance the reflection effect; referring to Figure 4 , the wavy pattern 1511 can cause light to scatter during reflection, reducing the possibility of direct light entering the internal probe 11, and is preferably wavy.

[0035] Furthermore, the depth of the pattern 1511 affects the refraction and reflection paths of light. A deeper pattern 1511 may cause light to be reflected and refracted multiple times inside the lens, thus increasing the probability of being reflected out; however, an overly deep pattern 1511 may lead to excessive light loss and scattering, affecting the normal detection of infrared rays of the human body or animals by the sensor. The depth of the geometric pattern 1511 in this case is 0.5 - 2 mm.

[0036] The spacing of the pattern 1511 affects the reflection and refraction paths of light inside the lens. If the spacing is too large, some light may directly pass through without sufficient reflection or refraction, thus affecting the blocking effect of the reflecting surface 151 on sunlight infrared rays; if the spacing is too small, light may be reflected and refracted multiple times between the patterns 1511, increasing the scattering of light and possibly reducing the effective reflection of infrared rays in a specific direction. The geometric pattern 1511 in this case is a continuous line, and the distance between adjacent patterns 1511 is 0.1 - 1 mm.

[0037] Specifically, when the shape of the pattern 1511 is serrated, the spacing can be relatively small, such as about 0.1 - 0.5 mm, so as to form a dense reflection interface between adjacent serrations and enhance the reflection effect on sunlight infrared rays. Refer to Figure 4 , for the wavy pattern 1511, due to its own shape characteristics, the spacing of the pattern 1511 can be about 0.3 - 0.8 mm to better adapt to the undulations of the wave and enable effective reflection and refraction of light between the wave crests and wave troughs. The spacing of the stepped pattern 1511 can be relatively larger, about 0.5 - 1 mm. This larger spacing can make each step form a relatively independent reflection unit and reduce the complexity of the manufacturing process.

[0038] In some embodiments, materials with high reflectivity can also be selected to make the pattern 1511 or surface treatment can be performed on the pattern 1511. For example, metal coatings (such as aluminum films, silver films, etc.) are used to improve the reflectivity of the reflecting surface 151 to infrared rays. At the same time, the material should have good stability and durability to ensure that the reflection performance will not decrease under different environmental conditions (such as temperature, humidity changes, etc.).

[0039] The above is a specific description of the preferred embodiments of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A PIR lens, characterized in that, It includes a lens body and a reflecting surface located on the upper part of the lens body. The surface of the reflecting surface is provided with a reflecting portion capable of reflecting the infrared rays of sunlight, and the reflecting surface is used to filter the infrared rays in the sunlight.

2. The PIR lens according to claim 1, wherein The reflecting surface is integrally formed with the lens body.

3. The PIR lens according to claim 2, characterized in that, The reflecting portion is an irregular geometric pattern, and the pattern is arranged within the reflecting surface.

4. The PIR lens according to claim 3, wherein, The geometric pattern includes one of sawtooth, wavy or stepped geometric shapes.

5. The PIR lens according to claim 3, characterized in that, The depth of the geometric pattern is 0.5 - 2 mm.

6. The PIR lens according to claim 3, characterized in that, The geometric pattern is a continuous line, and the distance between adjacent patterns is 0.1 - 1 mm.

7. The PIR lens according to any one of claims 3-6, characterized in that, The surface of the geometric pattern is provided with a metal coating material to form the reflecting surface, and the metal coating material is an aluminum film or a silver film.

8. The PIR lens according to claim 1, wherein The area of the reflecting surface accounts for 30% - 70% of the upper surface area of the PIR lens.

9. The PIR lens according to claim 8, wherein, The area of the reflecting surface accounts for 60% of the upper surface area of the PIR lens.

10. An anti-mis-triggering camera, characterized in that, It includes the PIR lens according to any one of claims 1 - 9, and a PIR probe disposed at the center of the PIR lens inside the camera. The PIR lens can filter the infrared rays in the sunlight and prevent the infrared rays from entering the camera interior to prevent mis-triggering.

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