Infrared sensor and its circuit applied to pedestrian passageway gate

Abstract

The application belongs to the technical field of infrared sensors, and discloses an infrared sensor applied to a pedestrian passage gate and a circuit thereof. The infrared sensor applied to the pedestrian passage gate and the circuit thereof comprise an infrared receiving end for infrared emission and an infrared transmitting end for receiving infrared rays. The infrared receiving end comprises a shell, a circuit board is arranged in the shell for mounting a receiving module, one end of the shell is provided with a lens as a receiving end, the other end of the shell is a wire outlet end, and a light control mechanism is arranged on one side of the shell close to the lens for controlling the amount of incoming light. The infrared sensor applied to the pedestrian passage gate and the circuit thereof can reduce the adverse effects of light interference by adjusting the amount of incoming light under different ambient light through the design of the light control mechanism, and can focus the light fibers in a straight line direction by using a light focusing assembly, thereby enhancing the anti-interference ability during night work.

Description

Technical Field

[0001] This invention relates to the technical field of infrared sensors, specifically to an infrared sensor and its circuitry used in pedestrian access gates. Background Technology

[0002] Pedestrian access gates are a type of security equipment widely used in public places. They use infrared sensing technology to monitor and control the passage of people. With the continuous advancement of technology and social development, infrared sensors on gates are playing an increasingly important role in security management and intelligent construction.

[0003] Infrared sensors for turnstiles utilize the characteristics of infrared light to monitor personnel passage. The principle is that an infrared transmitter emits infrared light; when a person or object passes by, the infrared light is blocked, causing a change in the signal received by the receiver. This triggers the turnstile system to open or close accordingly. This principle makes infrared sensors for turnstiles highly efficient and sensitive, accurately detecting personnel passage. For outdoor work scenarios, the anti-interference performance of the infrared receiver is particularly important, especially its resistance to light interference. During strong sunlight in the daytime, the infrared radiation generated by the sun may overlap with the infrared light wave unit used in communication, increasing the bit error rate. Summary of the Invention

[0004] The purpose of this invention is to provide an infrared sensor and its circuit for use in pedestrian access gates. This infrared sensor and its circuit for use in pedestrian access gates solves the problems mentioned in the background art and has excellent anti-light interference performance.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: an infrared sensor and its circuit for use in pedestrian access gates, comprising an infrared receiver for emitting infrared rays and an infrared transmitter for receiving infrared rays. The infrared receiver includes a housing, and a circuit board is disposed inside the housing for mounting a receiving module. A lens is disposed at one end of the housing as the receiving end, and the other end is the output end. A light control mechanism is disposed inside the housing near the lens for controlling the amount of light entering.

[0006] The light control mechanism includes a driving component, a light-shielding component, and a light-focusing component. The light-shielding component is disposed on the inner wall of the housing near the lens end. The driving component is disposed on the inner wall of the housing to drive the light-shielding component. The light-focusing component is disposed on the inner side of the lens.

[0007] Preferably, the drive assembly includes a linear motor and a movable ring, with several linear motors fixedly mounted on the inner wall of the housing, and one side of the movable ring fixedly connected to the output end of the linear motor.

[0008] Preferably, the light-shielding assembly includes a movable collar, light-shielding plates, a guide ring, and a guide groove. The movable collar is movably connected to the movable ring, and several light-shielding plates are fixedly connected to the side of the movable collar away from the movable ring. The guide ring is fixedly connected to the inner wall of the housing near the lens, and a guide groove is provided on the inner wall of the guide ring. The light-shielding plates are inserted into the corresponding guide grooves.

[0009] Preferably, the focusing component includes a liquid bladder, a wear-resistant layer, and a transparent filling liquid. One side of the liquid bladder is a rigid plane, and the other side is a soft spherical surface. The spherical side of the liquid bladder is bonded to the lens. The liquid bladder is filled with a transparent filling liquid, and the wear-resistant layer is coated on the plane of the liquid bladder.

[0010] Preferably, the number of light-shielding sheets is not less than four and they are arranged in a ring with reference to the axis of the movable collar, and the number of guide grooves is the same as the number of light-shielding sheets and they are arranged in a ring with reference to the axis of the guide ring.

[0011] Preferably, the guide groove is curved to guide each light-shielding sheet in order to control the amount of light entering.

[0012] Preferably, the number of wear-resistant layers is the same as the number of light-shielding sheets, and the wear-resistant layers are in strip shape on the movement trajectory of the light-shielding sheets. When the light-shielding sheets and wear-resistant layers are in complete contact, the curved side of the liquid bladder is compressed into a plane.

[0013] By adopting the aforementioned technical solution, the beneficial effects of the present invention are:

[0014] The infrared sensor and its circuitry applied to pedestrian access gates, through the design of the light control mechanism, can reduce the adverse effects of light interference by adjusting the amount of light entering under different ambient light conditions. Furthermore, by utilizing the light-concentrating component, it can focus the optical fiber in a straight line, thereby enhancing the anti-interference capability during nighttime operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention;

[0016] Figure 2 This is a circuit diagram of the infrared receiver of the present invention;

[0017] Figure 3 This is a circuit diagram of the infrared transmitter of the present invention.

[0018] In the diagram: 1. Outer shell; 2. Circuit board; 3. Receiver module; 4. Lens; 5. Light control mechanism; 51. Drive assembly; 511. Linear motor; 512. Moving ring; 52. Light shielding assembly; 521. Moving collar; 522. Light shielding plate; 523. Guide ring; 524. Guide groove; 53. Concentrating assembly; 531. Liquid bladder; 532. Wear-resistant layer; 533. Transparent filling liquid. Detailed Implementation

[0019] Please see Figure 1-3 The present invention provides a technical solution: an infrared sensor and its circuit for use in pedestrian access gates, including an infrared receiver for emitting infrared rays and an infrared transmitter for receiving infrared rays. The infrared receiver includes a housing 1, and a circuit board 2 is provided inside the housing 1 for mounting a receiver module 3. A lens 4 is provided at one end of the housing 1 as the receiver, and the other end is the output end. A light control mechanism 5 is provided inside the housing 1 near the lens 4 for controlling the amount of light entering.

[0020] The light control mechanism 5 includes a driving component 51, a light-shielding component 52, and a light-concentrating component 53. The light-shielding component 52 is disposed on the inner wall of the housing 1 near the end of the lens 4. The driving component 51 is disposed on the inner wall of the housing 1 to drive the light-shielding component 52. The light-concentrating component 53 is disposed on the inner side of the lens 4.

[0021] The drive assembly 51 includes a linear motor 511 and a movable ring 512. Several linear motors 511 are fixedly installed on the inner wall of the housing 1, and one side of the movable ring 512 is fixedly connected to the output end of the linear motor 511.

[0022] The light-shielding assembly 52 includes a movable collar 521, a light-shielding plate 522, a guide ring 523, and a guide groove 524. The movable collar 521 is movably connected to the movable ring 512. Several light-shielding plates 522 are fixedly connected to the side of the movable collar 521 away from the movable ring 512. The guide ring 523 is fixedly connected to the inner wall of the housing 1 near the lens 4. The inner wall of the guide ring 523 has a guide groove 524, and the light-shielding plates 522 are inserted into the corresponding guide grooves 524.

[0023] The focusing component 53 includes a liquid bladder 531, a wear-resistant layer 532, and a transparent filling liquid 533. One side of the liquid bladder 531 is a hard plane, and the other side is a soft spherical surface. The spherical side of the liquid bladder 531 is bonded to the lens 4. The liquid bladder 531 is filled with a transparent filling liquid 533, and the wear-resistant layer 532 is coated on the plane of the liquid bladder 531.

[0024] The number of light-shielding plates 522 is not less than four and they are arranged in a ring with reference to the axis of the movable collar 521. The number of guide grooves 524 is the same as the number of light-shielding plates 522 and they are arranged in a ring with reference to the axis of the guide ring 523.

[0025] The guide groove 524 is curved to guide each light-shielding plate 522 to control the amount of light entering.

[0026] The number of wear-resistant layers 532 is the same as the number of light-shielding sheets 522, and the wear-resistant layers 532 are strip-shaped and located on the movement trajectory of the light-shielding sheets 522. When the light-shielding sheets 522 and the wear-resistant layers 532 are in complete contact, the curved side of the liquid bladder 531 is compressed into a plane.

[0027] When this device is working, under strong ambient light (the light intensity can be detected by a light intensity sensor), especially during the day when the light is very strong, the linear motor 511 drives each light-blocking plate 522 to move, reducing the light-gathering range and pressing it onto the liquid bladder 531, causing the liquid bladder 531 to flatten and lose its light-gathering effect, receiving only light in a straight line. In the field, the light-blocking plates 522 retract, and the light-gathering component 53 focuses and enhances the light-receiving capability.

[0028] Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An infrared sensor for use in pedestrian access gates, comprising an infrared receiver for emitting infrared light and an infrared transmitter for receiving infrared light, wherein the infrared receiver includes a housing, and a circuit board is disposed within the housing for mounting a receiving module, characterized in that: One end of the housing is provided with a lens as a receiving end, and the other end is a wire output end. Inside the housing, near the lens, a light control mechanism is provided to control the amount of light entering. The light control mechanism includes a driving component, a light-shielding component, and a light-concentrating component. The light-shielding component is disposed on the inner wall of the housing near the lens end. The driving component is disposed on the inner wall of the housing to drive the light-shielding component. The light-concentrating component is disposed on the inner side of the lens. The light-shielding assembly includes a movable collar, light-shielding plates, a guide ring, and a guide groove. The movable collar is movably connected to the movable ring. Several light-shielding plates are fixedly connected to the side of the movable collar away from the movable ring. The guide ring is fixedly connected to the inner wall of the outer shell near the lens. The inner wall of the guide ring has a guide groove, and the light-shielding plates are inserted into the corresponding guide grooves. The focusing component includes a liquid bladder, a wear-resistant layer, and a transparent filling liquid. One side of the liquid bladder is a hard plane, and the other side is a soft spherical surface. The spherical side of the liquid bladder is bonded to the lens. The liquid bladder is filled with a transparent filling liquid, and the wear-resistant layer is coated on the plane of the liquid bladder. The number of wear-resistant layers is the same as the number of light-shielding sheets, and the wear-resistant layers are in strip shape on the movement trajectory of the light-shielding sheets. When the light-shielding sheets and wear-resistant layers are in complete contact, the curved side of the liquid bladder is compressed into a plane.

2. The infrared sensor for use in pedestrian access gates according to claim 1, characterized in that: The drive assembly includes a linear motor and a movable ring. Several linear motors are fixedly installed on the inner wall of the housing, and one side of the movable ring is fixedly connected to the output end of the linear motor.

3. The infrared sensor applied to a pedestrian access gate according to claim 2, characterized in that: The number of light-shielding plates is not less than four and they are arranged in a ring with reference to the axis of the movable collar. The number of guide grooves is the same as the number of light-shielding plates and they are arranged in a ring with reference to the axis of the guide ring.

4. An infrared sensor circuit, characterized in that: Including any one of the infrared sensors described in 1-3.

Images