TWI703867B - Safety device for the light source - Google Patents

Abstract

The invention is disclosed a safety device for the light source, comprising symmetrical two metal elastic component is disposed in a base, a circuit board is disposed on the bottom of the base, one end of the two metal elastic components is soldered and fixed on the circuit board, and the other end portion is exposed outside the top end of the base, and a light source component is disposed on the between two metal elastic elements. The mounting seat is disposed on the base, and the mounting seat is provided with a metal loop element that is in contact with the two metal elastic members exposed outside the top end of the base to form a conduction loop. A diffractive optics element is disposed on the mount, and the optical diffractive element and the metal loop element are used to form a signal connection by dispensing.

Description

Light source safety device

The present invention relates to a light source safety device, which refers to a light source safety device that can instantly turn off the light source according to the disconnection caused by the displacement of the optical diffraction element.

With the advancement of science and technology, more and more electronic products have multi-function, miniaturization and high-precision designs. In our lives, photography and camera functions are indispensable for electronic devices (such as camera systems, handheld devices, and medical investigation devices). In order to obtain good image quality and image effects, these electronic devices The product will install a camera device with multiple camera units to provide a wide range of photography functions. For example, combining camera units with different characteristics and collocation with different calculation functions can form camera devices with different functions. For example, camera devices can be provided to capture three-dimensional images, and can be used for three-dimensional modeling and motion recognition. And other purposes.

Continuing the light source design of the existing depth camera, the mobile phone can sense the actual distance between the device and the object in the lens by incorporating an infrared illuminator, an infrared camera lens, and a 16-megapixel RGB camera lens. Among them, the technical principle of the light source design is that the infrared illuminator emits the light source, through a quasi-diameter lens to make the light path parallel, and then through a diffractive optical element (DOE), the light source is diffracted to obtain a light spot, and the light spot hits the object. On the surface, another infrared camera captures the position of the spot, and the depth information is calculated through an algorithm. Due to the external environment, infrared light (940nm) is the first choice for the light source. Infrared light is invisible to human eyes. Therefore, when the light hits the human body directly without being diffracted, it will be harmful to the human body.

For the safety switch design of the existing depth camera, in addition to the silver glue connection on the circuit board under the DOE, there is also the LDS (technology) that uses the material itself to make the circuit, the purpose is to detect whether the DOE component is still in the original In the position, if it is no, the safety device will turn off the light source to avoid harm to the human body. However, there are difficulties in the manufacture of the current light source safety device. As shown in Figure 1, the safety device includes a circuit board assembly 10 on the side with a plurality of first electrical connection terminals 102, and a light source assembly 12 is assembled on the circuit board assembly 10. Finally, an optical diffractive element package 14 is installed on the light source assembly 12. The side of the optical diffractive element package 14 is provided with a plurality of second electrical connection ends 142, and these second electrical connection ends 142 correspond to The positions of the first electrical connection ends 102 are respectively provided on the second electrical connection ends 142 and the first electrical connection ends 102 by using the two terminals 162 of a signal connector 16, and then silver glue The terminals 162 are respectively connected to the second electrical connection terminals 142 and the first electrical connection terminals 102 by dispensing to form a conductive loop, and the purpose is to detect whether the optical diffraction element package 14 is still in its original position. Otherwise, the safety device will turn off the light source of the light source assembly 12 to avoid the risk of direct harm to the human body by the emitted infrared rays without being diffracted by the light. Wherein, when the signal connector 16 is installed, it is not only necessary to align the positions of the second electrical connection ends 142 and the first electrical connection ends 102 up and down, but also accurately dispense glue. For side glue dispensing operations In fact, it is difficult. Whether it is the angle of the production process or the dispensing position, the operator needs to have a high degree of concentration and precision, otherwise it is easy to cause dispensing errors and produce poor yield problems. Therefore, how to make the structural design of the safety device simpler and easier to dispense is a problem to be solved urgently.

In view of this, the present invention provides a light source safety device to effectively overcome the above-mentioned problems in view of the above-mentioned shortcomings of the prior art.

The main purpose of the present invention is to provide a light source safety device, which utilizes metal elastic elements to directly signal connection to solve the difficulty of side dispensing operation, and can complete the dispensing operation at the same time as the optical diffraction element is installed to improve the production efficiency and accuracy degree.

The secondary objective of the present invention is to provide a light source safety device whose overall structure is simpler and easier to manufacture, and the signal connection components are designed in the base body, which can improve the stability of the signal connection, and is extremely industrially applicable.

To achieve the above objectives, the present invention provides a light source safety device, which includes a circuit board, a light source element, a base, an optical diffraction element, and a mounting seat. The light source element is electrically connected to the circuit board, the base is provided with two symmetrical metal elastic elements, the circuit board is arranged at the bottom of the base, one end of the two metal elastic elements is connected to the circuit board, and the other end is exposed outside the top of the base , The light source element is arranged between two metal elastic elements; the mounting seat is arranged on the base, and a metal loop element is arranged in the mounting seat, which abuts against the two metal elastic elements exposed outside the top of the base to form a conduction loop, and the optical winding The radiation element is arranged on the mounting seat, and the optical diffraction element and the metal loop element are formed by dispensing glue to form a signal connection.

Wherein, the base is provided with two through holes and a first accommodating groove, the circuit board is installed at the bottom of the base, one end of the two metal elastic elements is connected to the circuit board, and the other end is penetrated by the through hole to the top of the base. The light source element is installed in the first containing groove.

Wherein, the mounting seat is provided with a second accommodating groove and a mounting part, the mounting part is located above the second accommodating groove, the mounting part and the second accommodating groove are in communication with the first accommodating groove, and the second accommodating groove A lens is accommodated, which can be a collimating lens, and the optical diffraction element is arranged in the mounting part.

Wherein, the mounting portion further extends with a plurality of glue dispensing areas, and silver glue is used to inject glue into these glue dispensing areas, so that the optical diffraction element and the metal circuit element can pass through the silver glue to form a signal connection.

Among them, one end of the two metal elastic elements is welded and fixed on the circuit board, and the light source element can be a laser light-emitting diode package element (TO can), which is welded and fixed on the circuit board and electrically connected to the circuit board .

Among them, the two metal elastic elements are metal probes or metal telescopic spring thimble.

Among them, the circuit board controls the operation of the light source element. When the optical diffraction element and the metal loop element do not produce a signal connection, or the metal loop element and the two metal elastic elements do not form a conductive loop, the light source element is turned off to improve the safety of the light source. The safety of the switch.

Wherein, the surface of the optical diffraction element has a transparent conductive film, and the transparent conductive film can be formed on the surface of the optical diffraction element through electroplating.

The above description can only be used to illustrate the problem to be solved by the present invention, the technical means to solve the problem, and the effects produced by it, etc. The specific details of the present invention will be described in detail in the following embodiments and related drawings.

The present invention is eager to improve and innovate, and after years of painstaking and intensive research, a light source safety device has been developed, which can solve the difficulties in the side dispensing process. Hereinafter, multiple embodiments of the present invention will be disclosed in the form of drawings. For clear description, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit the present invention. That is to say, in the embodiments of the present invention, some conventionally used structures and elements will be shown in a simple schematic manner in the drawings. It.

The 2019 research shows the new trend of the infrared sensing application market, and the continuous development of many infrared product applications such as mobile phone sensing, Lidar, and optical sensing, brings unlimited business opportunities to the infrared industry. Of course, the application of infrared rays. The technology of introducing depth cameras or projection devices is also quite competitive in the commercial market. In order to improve the quality of products such as depth cameras or projection devices, it is necessary to improve the prevention of infrared rays from harm to the human body, but relative The manufacturing cost and production efficiency of the light source safety device have also been tested. For this reason, the present invention has developed a light source safety device with a novel design to overcome the current technical bottleneck. Please refer to FIGS. 2 and 3 at the same time, which are the three-dimensional structural view and the three-dimensional exploded view of the present invention. Here, the overall detailed components and assembly methods are described in detail to understand the overall structure design of the present invention. The light source safety device includes a circuit board 20, a light source element 22, a base 24, a Diffractive Optics Element (DOE) 26, and a mounting seat 28. The light source element 22 is electrically connected to the circuit board 20. The base 24 is provided with two symmetrical metal elastic elements 30. The circuit board 20 is arranged at the bottom of the base 24. One end of the two metal elastic elements 30 is connected to the circuit board 20, and the other end Partly exposed outside the top of the base 24, the light source element 22 is disposed between the two metal elastic elements 30.

Among them, one end of the two metal elastic elements 30 is fixed on the circuit board 20 by welding, and the two metal elastic elements 30 are metal probes or metal telescopic spring thimble. For the metal probe (pogo pin), the pin shaft, The three basic components of spring and needle tube are formed by riveting and preloading the spring probe by precision instruments. The metal probe has a precision spring structure inside, and the surface is generally plated with gold, which can better improve its anti-corrosion function and mechanical performance. , Electrical performance, etc., when there are requirements on the process, the spring should also be energized or conducted by the gold-plated thimble. Most of the springs are in contact with the copper wall through the oblique downwards, and the spring bears a small amount. To be all conducted through the spring, the requirements for the spring are very high. Since the pogo pin is a very fine probe, it can be used in precision connectors to reduce the weight and appearance of the connector, and make the connector more refined and beautiful. In addition, the telescopic spring thimble can be an all-copper gold-plated telescopic current needle. The present invention uses many advantages and characteristics of the metal elastic element 30 as a signal connection element. Among them, the light source element 22 is an infrared laser diode module (To can), soldered on the circuit board 20, on which there are necessary electronic elements such as a driver IC, and the light source element 22 is arranged between the two metal elastic elements 30 between. Due to the extremely good luminous efficiency of the laser diode and the formation of the optical resonant cavity, it has the advantages of lightness and shortness, shock resistance, low power consumption, fast response, impact resistance, long life, high efficiency, good directionality and output Many features such as high power are suitable for long-distance and high-brightness micro-projection. Therefore, the present invention uses infrared laser diode modules as light sources.

Continuing, the base 24 is further provided with two through holes 242 and a first accommodating groove 244. When both ends of the two metal elastic elements 30 are welded and fixedly connected to the connecting circuit board 20, and the light source element 22 is welded to the circuit board 20 After mounting, the other ends of the two metal elastic elements 30 are respectively inserted through the two through holes 242 to the top of the base 24, so that part of the two metal elastic elements 30 are exposed, and the aperture of the two through holes 242 is slightly larger than that of the two metal elastic elements. The diameter and width of the element 30 can be easily assembled without being affected by external forces. At the same time, the light source element 22 is correspondingly installed in the first accommodating groove 244, and the shape of the first accommodating groove 244 matches the light source element 22, which can be assembled and fixed stably.

Next, please refer to Fig. 4 at the same time, which is a cross-sectional view of the structure along the AA' section of Fig. 2. The mounting seat 28 is provided on the base 24, and the mounting seat 28 is provided with a metal loop element 32 which is exposed to the base. The two metal elastic elements 30 outside the top end of the seat 24 form a conducting loop. The mounting base 28 is further provided with a second accommodating groove 282 and a mounting portion 284, the mounting portion 284 is located above the second accommodating groove 282, the mounting portion 284, the second accommodating groove 282, and the first accommodating groove 244 Department is connected. The second accommodating slot 282 accommodates a lens 34 corresponding to the light source position of the light source element 22. Among them, the lens 34 may be a collimating lens, whose function is to assist the advancement of the light to reach an almost parallel and straight direction, so as to avoid the loss of light energy caused by the divergence of light propagation, and to collimate the light beam. The optical diffraction element 26 is disposed in the mounting portion 284, and the mounting portion 284 further extends with a plurality of dispensing areas 286, and the metal loop elements 32 are exposed in the dispensing areas 286. The surface of the optical diffractive element 26 has a transparent conductive film (Indium Tin Oxide, ITO) 262, which can be formed on the surface of the optical diffractive element 26 by electroplating. The optical diffractive element 26 is based on light waves. According to the theory of diffraction, the surface structure of the diffraction element is calculated according to known conditions, so that the optical diffraction element 26 can change the phase of the wavefront through which the laser light passes to produce the expected wavefront distribution; therefore, the present invention uses an optical diffraction element 26 is used with the infrared wavelength laser to complete any desired optical image expression method. Finally, silver glue 36 can be used to inject the glue into these glue areas 286 to make the surface of the optical diffraction element 26 transparent and conductive film The 262 and the metal circuit element 32 are connected through the silver glue 36 to form a signal connection, that is, a closed circuit is formed.

After understanding the above-mentioned novel structural design of the present invention, in actual application, the circuit board 20 controls the operation of the light source element 22. When the optical diffraction element 26 and the metal loop element 32 are not signal-connected, or the metal loop element 32 and the two When the metal elastic element 30 does not form a conductive loop, the light source element 22 is turned off to avoid the risk of the emitted laser infrared rays directly harming the human body without being diffracted, so as to improve the safety of the light source. As shown in Fig. 5, another three-dimensional structure diagram of the light source safety device of the present invention is further provided with an infrared module 38 on the base 24, which includes an infrared lens (IR Camera) 382, flood light sensor element (Flood Illuminator) 384 and a drive circuit board 386, infrared lens 382 and flood light sensing element 384 are electrically connected to the drive circuit board 386, and are driven by the drive circuit board 386. The drive circuit board 386 can be a rigid-flex composite board (Rigid -Flex board). The driving circuit board 386 is connected to the circuit board 20 at the bottom of the base 24 through a signal connector 388 to form an electrical connection. The driving circuit board 386 operates according to the circuit board 20 to control the opening and closing of the light source element 22. The light source element 22 emits a laser light source through a collimator lens to make the optical path parallel, and then is diffracted on the surface of the object by the optical diffraction element 26 to obtain a pattern (Pattern), and the projected object is received by the infrared lens of the infrared module 38 The spot pattern on the surface, because the spot patterns at any two places in the space are different, and are related to the spatial position of the object. Therefore, the depth information can be calculated by the algorithm to obtain the three-dimensional information of the space. Among them, the flood light sensor 384 avoids misjudgment caused by using the infrared lens to capture the spot pattern in an over-bright or over-dark environment.

To sum up, the present invention uses metal elastic elements to directly signal connection to solve the difficulty of side dispensing operation. At the same time, the metal loop element for signal connection is buried in the mounting base, and then the optical diffraction element is mounted on the mounting base. A signal loop is formed. This design not only makes the signal more stable, but also avoids the risk of disconnection and disconnection. If the generated signal is not connected, the light source will be turned off immediately, which can ensure that the emitted laser infrared rays will not directly harm the human body without being diffracted, so that the light source safety device has It is safe to use. In addition, the present invention directly designs the glue area on the mounting seat, which can be completed more accurately and quickly for the operator during the glue dispensing operation, which can effectively improve the production efficiency and precision. Furthermore, the overall structural design of the present invention is simpler and easier to manufacture, and both assembly and dispensing operations can be completed quickly, which has a great market competitive advantage.

Only the above are merely preferred embodiments of the present invention, and are not used to limit the scope of the present invention. Therefore, all equivalent changes or modifications made in accordance with the characteristics and spirit of the application scope of the present invention shall be included in the patent application scope of the present invention.

10: Circuit board components

102: The first electrical connection

12: Light source assembly

14: Optical diffraction element package

142: second electrical connection

16: signal connector

162: Terminal

20: circuit board

22: Light source components

24: Pedestal

242: Through hole

244: The first holding tank

26: Optical diffraction element

262: Transparent conductive film

28: Mounting seat

282: second holding tank

284: Installation Department

286: Dispensing area

30: Metal elastic element

32: Metal loop components

34: lens

36: Silver glue

38: infrared module

382: infrared lens

384: flood light sensor

386: drive circuit board

388: signal connector

Figure 1 is an exploded perspective view of the prior art safety device. Figure 2 is a three-dimensional structural diagram of the light source safety device of the present invention. Figure 3 is an exploded perspective view of Figure 2. Figure 4 is a cross-sectional view of the structure taken along the A-A' section of Figure 2. Figure 5 is another three-dimensional structural view of the light source safety device of the present invention.

20: circuit board

22: Light source components

24: Pedestal

242: Through hole

244: The first holding tank

26: Optical diffraction element

262: Transparent conductive film

28: Mounting seat

282: second holding tank

284: Installation Department

286: Dispensing area

30: Metal elastic element

32: Metal loop components

34: lens

Claims (10)

A light source safety device includes: a circuit board; a light source element electrically connected to the circuit board; a base with two symmetrical metal elastic elements, the circuit board is arranged at the bottom of the base, and the two metals One end of the elastic element is connected to the circuit board, and the other end is partially exposed outside the top of the base. The light source element is arranged between the two metal elastic elements; an optical diffraction element; and a mounting seat arranged on the base. On the base, a metal loop element is arranged in the mounting base, which abuts against the two metal elastic elements exposed outside the top of the base to form a conduction loop, and the optical diffractive element is arranged on the mounting base and uses glue The optical diffraction element and the metal loop element are formed to form a signal connection. The light source safety device according to claim 1, wherein the base is provided with two through holes and a first accommodating slot, the circuit board is mounted on the bottom of the base, and one end of the two metal elastic elements is connected to the The other end of the circuit board penetrates the through hole to the top of the base, and the light source element is installed in the first accommodating groove. The light source safety device according to claim 2, wherein the mounting seat is provided with a second accommodating groove and a mounting part, the mounting part is located above the second accommodating groove, the mounting part, the second accommodating groove and The first accommodating groove is connected, the second accommodating groove is accommodating a lens, and the optical diffractive element is arranged in the mounting portion. The light source safety device according to claim 3, wherein the lens is a collimating lens. The light source safety device according to claim 3, wherein the mounting portion is further extended with a plurality of dispensing areas, and silver glue is used to inject glue into the dispensing areas to allow the optical diffraction element and the metal loop element to pass through Silver glue to form a signal connection. The light source safety device according to claim 1, wherein one end of the two metal elastic elements is welded and fixed to the circuit board. The light source safety device according to claim 1, wherein the two metal elastic elements are metal probes. The light source safety device according to claim 1, wherein the two metal elastic elements are metal telescopic spring thimble. The light source safety device according to claim 1, wherein the circuit board controls the operation of the light source element, when the optical diffraction element and the metal loop element do not generate a signal connection, or the metal loop element and the two metals are elastic When the element does not form a conduction loop, the light source element is turned off. The light source safety device according to claim 1, wherein the surface of the optical diffraction element has a transparent conductive film.

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