A portable multi-band light source device

Abstract

The application discloses a portable multi-waveband light source device, which comprises a shell with a long strip shape, an LED lamp pearl plate provided with four LED lamp pearls capable of emitting red light, blue light, green light and ultraviolet light respectively, a light reflecting cup for mixing the light emitted by the four LED lamp pearls and emitting the mixed light, and a circuit board mounted in the shell and provided with a single-chip microcomputer for controlling the opening and closing and brightness of each LED lamp pearl. The application is mainly applied to the scene of on-site police call-out and on-site investigation, and has the advantages of low cost, portability and miniaturization, so that the police on call-out can perform simple on-site investigation at the first time of call-out, find the existing potential fingerprints, footprints, body fluids or trace evidence, and thus improve the case solving rate. In addition, the professional equipment is distributed to cultivate the on-site investigation consciousness of grass-roots police, provide a new case solving way for the detection of small cases of people's livelihood except video monitoring, and has strong popularization value.

Description

Technical Field

[0001] This application relates to the field of police equipment technology, and in particular to a portable multi-band light source device. Background Technology

[0002] In investigations and criminal proceedings, devices such as multi-band light sources are used to discover clues that are difficult to detect with the naked eye under natural light, such as fingerprints, footprints, bodily fluids, or trace evidence. However, these devices are bulky, expensive, and complex to operate, generally requiring specialized technicians. As a result, such devices are rarely deployed by police and are typically used only in major cases.

[0003] In view of this, a new technical solution is needed to solve the above-mentioned technical problems. Summary of the Invention

[0004] The purpose of this application is to provide a portable multi-band light source device to solve the problem of low police response rate and low case-solving rate caused by existing investigation equipment in grassroots public security bureaus.

[0005] To achieve the above objectives, this application employs the following technical means: A portable multi-band light source device, comprising: The shell has a long, narrow shape; The LED bead board is set perpendicular to the length of the housing. The LED bead board has four LED beads, which can emit red light, blue light, green light and ultraviolet light respectively. A reflector is located at the front end of the housing. This reflector is used to mix and project the light emitted by the four LED beads. A lens is provided on the front side of the reflector. The circuit board installed inside the housing has a shape that matches the housing's exterior. The circuit board is equipped with a microcontroller, which is connected to four LED beads to control the on / off state and brightness of each LED bead. The button protrudes from the housing surface at its upper end and is connected to the circuit board at its lower end. This button is used to trigger the switching circuit to control the final light mixing effect. The power supply is installed inside the housing and has a shape that matches the housing. The power supply is connected to the circuit board and is used to provide power to the LED beads and the control circuit of the circuit board.

[0006] As a further improvement, the brightness of the LED beads is divided into four levels, corresponding to 100%, 75%, 50% and 0% luminous intensity, respectively.

[0007] As a further improvement, the microcontroller controls the brightness of the four LED beads by outputting high and low levels through different pins.

[0008] As a further improvement, the button can be pressed in two ways: long press and short press. Press and hold to switch between different colors of LED beads; A short press adjusts the brightness of the current LED bead.

[0009] As a further improvement, a total of 15 light mixing modes are provided.

[0010] As a further improvement, the red light wavelength is 625nm, the blue light wavelength is 455nm, the green light wavelength is 520nm, and the ultraviolet light wavelength is 365nm.

[0011] As a further improvement, the housing has a cylindrical shape, and the circuit board is a long strip.

[0012] As a further improvement, a display screen is also included, which is directly integrated onto the circuit board and exposed on the surface of the housing.

[0013] As a further improvement, the device is also provided with a charging port at its tail end.

[0014] A single police officer's multi-functional belt includes a belt body and several equipment sleeves, one of which is used to assemble the portable multi-band light source device as described above.

[0015] Compared with existing technologies, this application brings the following technical effects: This application is primarily applied to scenarios such as on-site police response and investigation. Leveraging the advantages of its affordability, portability, and miniaturization, professional on-site investigation equipment is distributed to frontline officers, allowing them to conduct simple on-site investigations immediately upon arrival. This enables them to search for potential fingerprints, footprints, bodily fluids, or trace evidence, and to directly extract or selectively preserve these traces and other evidence, protecting the integrity and originality of the scene and improving the retention of clues. This significantly reduces the workload of professional on-site investigation technicians. Furthermore, distributing this specialized equipment cultivates on-site investigation awareness among frontline officers, providing a new avenue for solving cases besides video surveillance. Combined with the fingerprint comparison system in the police terminal, on-site fingerprint comparison can quickly identify suspects, and DNA can be extracted from latent fingerprints found at the scene. This brings some aspects of on-site investigation forward to the first moment of police response, extending the use of specialized lighting, previously only available to a few cases, to almost all cases, thus improving the overall crime-solving rate at the grassroots level. The equipment's significant cost advantage allows for widespread adoption in every grassroots police station nationwide, possessing broad application potential. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram (longitudinal section) of the portable multi-band light source device of Embodiment 1 is shown. Figure 2 The diagram shows the internal circuit control principle of the portable multi-band light source device according to Embodiment 1.

[0018] Explanation of key component symbols: Lens-1; Reflector-2; LED bead board-4; Heat sink-5; Foam pad-6; LED bead wire-7; Housing-8; Circuit board-9; Button-10; Anti-slip structure-11; Display screen-12; Power supply-13; Power cord-14; Charging port-15. Detailed Implementation

[0019] The following detailed description, in conjunction with the accompanying drawings and specific embodiments of this application, is provided. The following examples are for illustrative purposes only and are not intended to limit the scope of this application.

[0020] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0021] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0022] Example 1 like Figure 1 and Figure 2As shown, a portable multi-band light source device includes a housing 8, an LED bead board 4, a reflector 2, a circuit board 9, a button 10, and a power supply 13.

[0023] The housing 8 has a long, narrow shape and can be inserted into the equipment sleeve of a single police multi-functional belt. The housing 8 is cylindrical in shape and made of high-strength aluminum alloy. Its surface is treated to provide good wear resistance and corrosion resistance. Preferably, the surface of the housing 8 can also be provided with an anti-slip structure 11, such as anti-slip textures or anti-slip protrusions. Specifically, the housing 8 has a front end and a rear end cover at both ends, which are connected to the housing 8 by threads. A lens 1 is located on the outer side of the front end. Since the axial distance between the front end and the housing 8 is adjustable, the focusing effect of the lens 1 on the mixed light spot can be adjusted. The rear end cover is removable, facilitating the installation of internal components.

[0024] The LED bead board 4 is located at the front end inside the housing 8, perpendicular to the length of the housing 8. The outline of the LED bead board 4 matches the cross-section of the housing 8, and it has four LED beads (not shown in the figure). The four LED beads can emit red, blue, green, and ultraviolet light respectively. The four LED beads are connected to the circuit board 9 through LED bead wires 7. The wavelength of the red LED bead is 625nm, the wavelength of the blue LED bead is 455nm, the wavelength of the green LED bead is 520nm, and the wavelength of the ultraviolet LED bead is 365nm. These four colors of LED beads are designed to match criminal investigation scenarios and each has a specific function. The main uses of ultraviolet light are: to excite certain fluorescent substances (such as some bodily fluids, fibers, and chemical agents), to detect latent fingerprints (especially after treatment with powder or chemical reagents), and to detect certain forged documents (such as security threads and fluorescent inks). The main uses of blue light are: as one of the most commonly used wavelengths, used in conjunction with an orange filter, to detect latent fingerprints (especially untreated natural sweat fingerprints), to detect bodily fluid stains (such as semen stains, saliva, and urine), and to detect biological tissue residue. The main uses of green light are: used in conjunction with a red filter to detect certain fibers and dyes, to enhance contrast against specific backgrounds, and to detect faint traces. The main uses of red light are: used in conjunction with a green filter to detect certain dyes and fibers, and to observe subcutaneous bleeding (under specific conditions). Four LED beads are arranged in a rectangular or diamond pattern on the LED bead board 4 to ensure that the different colors of light are fully mixed before emission.

[0025] Even better, to dissipate the heat generated by the LED beads, a heat sink 5 can be provided inside the housing 8, on the inner side adjacent to the LED bead board 4. This heat sink 5, for example, can be made of a porous aluminum alloy to prevent heat from concentrating on the LED bead board 4. More specifically, a sponge pad 6 is also attached to the side of the heat sink 5 away from the LED bead board 4. This sponge pad 6 acts as a buffer, preventing internal components (mainly the battery) from impacting the LED bead board 4 and causing it to loosen.

[0026] The reflector 2 is positioned at the front end of the housing 8, in the light-emitting direction of the LED bead plate 4. The reflector 2 has a mixing cavity (i.e., the internal space enclosed by the walls of the reflector), the inner wall of which is a reflective surface. This reflective surface is parabolic in shape and is used to reflect, mix, and project the light emitted by the four LED beads forward. When multiple LED beads are lit simultaneously, the different colors of light are fully mixed after multiple reflections within the mixing cavity, forming a uniform mixed light spot that is emitted from the front end of the housing 8. The mixed light spot emitted by the reflector 2 is then focused by the lens 1 before being emitted again, achieving a better illumination effect.

[0027] Circuit board 9 is installed inside housing 8. Circuit board 9 has a long strip shape that matches the inner cavity of housing 8. Circuit board 9 extends along the length of housing 8, with its front end electrically connected to LED bead board 4 and its rear end electrically connected to power supply 13. Circuit board 9 is equipped with a microcontroller, which controls the on / off state and brightness of four LED beads by outputting high and low levels through different pins. Specifically, in this embodiment, the microcontroller model is FT61FC23RB, and the specific circuit schematic is shown in [reference needed]. Figure 2 The circuit principle is based on a microcontroller to control multiple light-emitting units. This is existing technology and will not be described in detail in this embodiment.

[0028] Button 10 is located in the middle or near the rear of housing 8, with its upper end protruding from the surface of housing 8 for easy pressing by the operator. The lower end of button 10 is connected to circuit board 9. Button 10 is used to trigger the switching circuit to control the final light mixing effect. (See also...) Figure 1 To achieve an extremely compact structure, the bottom of button 10 is directly connected to circuit board 9, thereby minimizing the size of the device.

[0029] The power supply 13 is installed inside the housing 8, located behind the circuit board 9. The power supply 13 has an elongated shape that matches the inner cavity of the housing 8; its cross-section can be cylindrical or rectangular. The power supply 13 is connected to the circuit board 9 via a power cable 14, providing power to the LED beads and the control circuitry of the circuit board 9. Specifically, the power supply 13 preferably uses a 3.7V 3800mAh polymer battery, providing up to 6 hours of full-power operation to meet the needs of extended emergency response.

[0030] A charging port 15 is also provided at the rear end of the housing 8. This charging port 15 is connected to the power supply 13 via a power cord 14. Therefore, this device can be connected to an external power source to charge the power supply 13. The charging port 15 preferably adopts a Type-C interface to improve the universality and convenience of charging.

[0031] Button 10 has two operation modes: long press and short press. A long press switches between different colored LEDs, moving from the currently lit LED to the next, cycling through them. A short press adjusts the brightness of the currently lit LED. The LED brightness has four levels, corresponding to 100%, 75%, 50%, and 0% luminous intensity, which are adjusted sequentially by short pressing button 10.

[0032] The microcontroller controls the brightness of four LEDs by outputting high and low levels through different pins, enabling the combined illumination of LEDs of different colors. Based on the independent switching control of the four LEDs, 15 different mixing modes can be formed, including individual illumination of all four LEDs (4 modes), illumination of any two LEDs (6 modes), illumination of any three LEDs (4 modes), and simultaneous illumination of all four LEDs (1 mode). The specific combinations of each mixing mode are shown in the table below: By switching between the 15 light mixing modes mentioned above, this device can flexibly select the most suitable light source combination according to different exploration needs. For example, for searching for fluorescent substances (such as certain body fluids and fibers), ultraviolet light can be used alone or in combination with blue light to excite fluorescence; for fingerprint searching, blue light or green light can be used in conjunction with an orange filter; for general lighting and on-site photography, full-spectrum white light mode can be used.

[0033] In another embodiment, the device further includes a display screen 12, which is directly integrated onto the circuit board 9 and exposed on the surface of the housing 8. The display screen 12 is located in the rear-middle part of the housing 8, behind the button 10. The display screen 12 displays the current operating status of the LED beads, including the color of the currently lit LED bead, brightness level, battery level, and other information, allowing the operator to intuitively understand the device's operating status. Preferably, the display screen 12 is an OLED display screen, which has the advantages of high brightness and low power consumption. Figure 1 As can be seen, the bottom of the display screen 12 is also directly connected to the circuit board 9. This arrangement is also made to minimize the size of the device.

[0034] When the device is in operation, the operator can switch between different colored LED beads by pressing and holding button 10, and adjust the brightness level of the current LED bead by pressing button 10 briefly, thereby obtaining the desired light mixing effect. When all four LED beads are turned off (brightness level is 0%), the device is in standby sleep mode, at which time the power consumption is extremely low, which can effectively extend the standby time.

[0035] This embodiment uses a microcontroller to control the on / off state and brightness of LED beads of different colors, which has the following advantages compared to traditional control circuits: 1. LEDs are current-driven devices, and traditional solutions require a constant current driver chip to ensure consistent brightness. However, the current requirements and voltage characteristics of multiple LEDs of different colors vary, meaning that multiple driver circuits and a large number of external components (resistors, capacitors, inductors, etc.) are needed. A microcontroller solution can eliminate these requirements: by directly controlling the MOSFET or a dedicated LED driver chip through the microcontroller's PWM pin, independent control of multiple LEDs can be achieved with a small number of components.

[0036] 2. The programming features of the microcontroller make the control method very flexible. It can achieve arbitrary color combinations and stepless dimming through software, which is difficult to achieve with pure hardware circuits.

[0037] 3. Button 10, touch controls, etc., can all be directly read through the microcontroller's I / O port, and then the software logic determines which LED to light up and how bright. Compared to pure hardware circuits, using software to handle button logic is much simpler and easier to expand (such as long press, double click, multi-click, etc.).

[0038] This application also provides a single-officer multi-functional belt (not shown). The single-officer multi-functional belt includes a belt body and several equipment sleeves. The belt body is worn on the body, and the equipment sleeves are used to attach police equipment, including but not limited to baton sleeves, handcuff sleeves, tear gas spray sleeves, walkie-talkie sleeves, magazine sleeves, and police communication sleeves.

[0039] One of the equipment sleeves is used to assemble the aforementioned portable multi-band light source device. The equipment sleeve has a receiving cavity that matches the shape of the housing 8, and the open end of the equipment sleeve is provided with fasteners (such as Velcro, snaps, or buckles) for securing the portable multi-band light source device inside the equipment sleeve. The equipment sleeve is preferably located on one side of the belt body (such as the left or right side) for easy access by officers on duty.

[0040] In this way, police officers can wear the portable multi-band light source device of this application as standard single police equipment, and can use it as soon as they arrive at the crime scene to conduct a preliminary investigation of the scene, discover potential traces and physical evidence, and greatly improve the efficiency of case solving.

[0041] For example, in a case of theft from a car, where the value of the stolen goods was relatively small, there was no surveillance video at the scene, and the crime scene was not protected, this portable multi-band light source device enabled the police to discover half a potential latent fingerprint immediately upon arrival at the scene, successfully identifying the suspect. In the past, similar cases would have been treated as cold cases. This case, thanks to the device, uncovered new clues and was quickly solved, providing grassroots police stations with a new, simple, and efficient method for solving cases beyond simply reviewing surveillance footage. This equipment significantly helps improve the crime-solving rate at the grassroots level, increases public recognition of the police's investigative capabilities, and has significant potential for widespread adoption.

[0042] Example 2 like Figure 1 and Figure 2 As shown, the main difference between this embodiment and embodiment one is that the shell 8 in this embodiment is made of engineering plastic material, which has a lighter weight and is suitable for long-term carrying.

[0043] In this embodiment, the power supply 13 uses a replaceable 18650 lithium battery, and the rear end of the casing 8 is equipped with a battery compartment cover for easy battery replacement. For scenarios requiring long-term continuous use, multiple spare batteries can be provided for replacement.

[0044] In this embodiment, the button 10 is located on the side wall of the housing 8, with its upper end protruding from the surface of the housing 8, facilitating operation by the operator using their thumb when holding the device. The button 10 can be operated as follows: pressing the button 10 for more than 1 second switches the currently operating LED bead; pressing the button 10 for less than 0.5 seconds adjusts the brightness level of the currently operating LED bead.

[0045] In this embodiment, the four LED beads on the LED bead board 4 employ flip-chip packaging technology to improve heat dissipation and light output efficiency. The four LED beads are arranged in a diamond pattern to ensure that the different colors of light can be mixed more evenly within the mixing cavity of the reflector cup 2.

[0046] The reflective surface of the reflector cup 2 in this embodiment is a microprism array structure. This microprism array structure can perform multiple total internal reflections of the incident light to achieve efficient light mixing, while effectively reducing the volume of the light mixing cavity, which is beneficial to the miniaturization design of the device.

[0047] In this embodiment, the total length of the device does not exceed 150mm, the maximum outer diameter does not exceed 30mm, and the overall weight does not exceed 200g, thus meeting the portability requirements of single police equipment.

[0048] The portable multi-band light source device in this embodiment can also be installed in the equipment sleeve of a single police multi-functional belt to achieve the same function as in Embodiment 1.

[0049] As a preferred embodiment, the device also includes a wireless communication module (not shown in the figure), which is disposed on the circuit board 9 and is used to communicate wirelessly with a mobile terminal (such as a police mobile phone).

[0050] The wireless communication module includes a Bluetooth module and / or a Wi-Fi module, which is used to send the current working status information of the LED beads (including the current color, brightness level, battery level, etc.) to the mobile terminal and receive control commands sent by the mobile terminal to achieve remote control.

[0051] With the wireless communication module, operators can install a matching application on their police mobile phones to remotely control the device's power switch, color switching, and brightness adjustment, making it convenient for use in special scenarios (such as when two-handed operation or concealed operation is required).

[0052] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom still fall within the scope of protection of this application.

Claims

1. A portable multi-band light source device, characterized in that, include: The shell has a long, narrow shape; The LED bead board is set perpendicular to the length of the housing. The LED bead board has four LED beads, which can emit red light, blue light, green light and ultraviolet light respectively. A reflector is located at the front end of the housing. This reflector is used to mix and project the light emitted by the four LED beads. A lens is provided on the front side of the reflector. The circuit board installed inside the housing has a shape that matches the housing's exterior. The circuit board is equipped with a microcontroller, which is connected to four LED beads to control the on / off state and brightness of each LED bead. The button protrudes from the housing surface at its upper end and is connected to the circuit board at its lower end. This button is used to trigger the switching circuit to control the final light mixing effect. The power supply is installed inside the housing and has a shape that matches the housing. The power supply is connected to the circuit board and is used to provide power to the LED beads and the control circuit of the circuit board.

2. The portable multi-band light source device as described in claim 1, characterized in that, The brightness of the LED beads is divided into four levels, corresponding to 100%, 75%, 50% and 0% luminous intensity, respectively.

3. The portable multi-band light source device as described in claim 2, characterized in that, The microcontroller controls the brightness of the four LED beads by outputting high and low levels through different pins.

4. The portable multi-band light source device as described in claim 3, characterized in that, The button can be pressed in two ways: long press and short press. Press and hold to switch between different colors of LED beads; A short press adjusts the brightness of the current LED bead.

5. The portable multi-band light source device as described in claim 1, characterized in that, There are a total of 15 light mixing modes.

6. The portable multi-band light source device as described in claim 1, characterized in that, The red light wavelength is 625nm, the blue light wavelength is 455nm, the green light wavelength is 520nm, and the ultraviolet light wavelength is 365nm.

7. The portable multi-band light source device as described in claim 1, characterized in that, The housing has a cylindrical shape, and the circuit board is a long strip.

8. The portable multi-band light source device as described in claim 1, characterized in that, It also includes a display screen, which is directly integrated onto the circuit board and exposed on the surface of the housing.

9. The portable multi-band light source device as described in claim 1, characterized in that, The device is also equipped with a charging port at its tail end.

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