Real-time focusing device applied to optical detection system

Abstract

The utility model discloses a real-time focusing device applied to an optical detection system, which relates to the technical field of dynamic focusing and comprises a collector, a light source regulator and a light source receiving assembly. The light source regulator comprises a light source and a focus regulator; the light source, the focus regulator and the light source receiving assembly are sequentially arranged on a light path emitted by the light source; the collector is arranged on a reverse extension line of the light path; the light source receiving assembly comprises a light source receiver and a workpiece to be detected which are located on the same horizontal line. The device is small in size, can be integrated, is sensitive in response, and can ensure that the light source of the whole system is located at the optimal convergence position.

Description

Technical Field

[0001] The utility model relates to the technical field of dynamic focusing, and more specifically to a real-time focusing device applied to an optical detection system. Background Art

[0002] At present, the light sources used in optical detection generally change the optical path through media such as Fresnel lenses, light homogenizing films, and polarization films to achieve a better illumination effect. In actual use, it is often impossible to accurately determine whether the best focusing position is achieved. Therefore, how to determine the best focal point position is an urgent problem for those skilled in the art. Summary of the Utility Model

[0003] In view of this, the utility model provides a real-time focusing device applied to an optical detection system, which overcomes the above defects.

[0004] In order to achieve the above object, the utility model adopts the following technical scheme:

[0005] A real-time focusing device applied to an optical detection system includes: a collector, a light source regulator, and a light source receiving component; the light source regulator includes a light source module and a focus regulator; the light source module, the focus regulator, and the light source receiving component are sequentially arranged on the optical path emitted by the light source module; the collector is arranged on the reverse extension line of the optical path; the light source receiving component includes a light source receiver and a workpiece to be measured located on the same horizontal line.

[0006] Optionally, the focus regulator includes a lens module and an adjusting device, and the lens module is fixedly connected to the adjusting device.

[0007] Optionally, the adjusting device includes a power device and a slide rail fixed on a housing, and a slider arranged in the slide rail and slidably connected to the power device; the slider is also fixedly connected to the lens module.

[0008] Optionally, the light source module includes a plurality of light sources and a mounting table, and the plurality of light sources are evenly fixed on the mounting table; the mounting table is a hollow structure.

[0009] Optionally, the light source receiver includes a area array CMOS and a single-chip microcomputer; the area array CMOS is electrically connected to the single-chip microcomputer.

[0010] Optionally, the light source controller is electrically connected to the light source module, the focus regulator, and the light source receiver respectively.

[0011] Optionally, it further includes a host computer, and the host computer is electrically connected to the collector and the light source controller respectively.

[0012] Optionally, it further includes a carrier table for carrying the light source receiver and the workpiece to be measured; the carrier table is electrically connected to the upper computer.

[0013] As can be seen from the above technical solutions, compared with the prior art, the present utility model discloses a real-time focusing device applied to an optical detection system, which is small in size, integratable, sensitive in response, and can ensure that the light source of the entire system is in the best converging position. The converging position can also be arbitrarily specified with high repeatability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model, and those of ordinary skill in the art can also obtain other drawings according to the provided drawings without creative efforts.

[0015] Figure 1 It is a schematic structural diagram of the device of the present utility model;

[0016] Figure 2 It is a schematic structural diagram of the light source regulator of the present utility model;

[0017] Figure 3 It is a schematic structural diagram of the light source module of the present utility model;

[0018] Fig. 4(a) is a schematic diagram of the irradiation area of the light source on the light source receiver during the best focus search process; Fig. 4(b) is a schematic diagram of the irradiation area of the light source on the light source receiver at the best focus; Fig. 4(c) is a schematic diagram of the irradiation area of the light source on the light source receiver when leaving the best focus;

[0019] Figure 5 It is a schematic diagram of the implementation principle of the present utility model;

[0020] In the figure, 1 is a collector; 21 is a light source module, 211 is a mounting table, 212 is a light source; 22 is a focus regulator, 221 is a lens module, 222 is a power device, 223 is a slide rail, 224 is a slider; 31 is a light source receiver, 311 is a area array CMOS, 312 is a single-chip microcomputer; 32 is a workpiece to be measured; 4 is a light source controller; 5 is an upper computer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] An embodiment of the present utility model discloses a real-time focusing device applied to an optical detection system. As Figure 1 shown, it includes: a collector 1, a light source regulator, and a light source receiving component; the light source regulator includes a light source module 21 and a focus regulator 22; the light source module 21, the focus regulator 22, and the light source receiving component are sequentially arranged on the optical path emitted by the light source module 21; the collector 1 is arranged on the reverse extension line of the optical path; the light source receiving component includes a light source receiver 31 and a workpiece to be measured 32 located on the same horizontal line.

[0023] In one embodiment, as Figure 2 shown, the light source module 21 and the focus regulator 22 are integrated in the same housing. In this embodiment, the housing is a columnar body. Among them, the focus regulator 22 includes a lens module 221 and an adjusting device, and the lens module 221 is fixedly connected to the adjusting device.

[0024] In one embodiment, the adjusting device includes a power device 222 and a slide rail 223 fixed on the housing, and a slider 224 arranged in the slide rail 223 and slidably connected to the power device 222; the slider 224 is fixedly connected to the lens module 221; specifically: in this embodiment, the power device 222 is a motor, the transmission part of the motor is fixedly connected to a screw rod arranged in the slide rail 223, a matching nut is arranged on the screw rod, that is, the slider 224; the lens module 221 is fixedly installed on the nut. After receiving the electrical signal output by the light source controller 4, the motor starts, the transmission part of the motor drives the screw rod to rotate, the screw rod drives the nut to move up and down, and the lens module 221 fixed on the nut also moves up and down.

[0025] In one embodiment, as Figure 3 shown, the light source module 21 includes a plurality of light sources 212 and a mounting table 211, and the plurality of light sources 212 are evenly fixed on the mounting table 211; the mounting table 211 is a hollow structure; specifically: in this embodiment, the mounting table 211 is an annular body, and the light sources 212 are arranged in an equidistant circular arrangement on the annular body.

[0026] In one embodiment, the light source receiver 31 includes a area array CMOS 311 and a single-chip microcomputer 312; the area array CMOS 311 is electrically connected to the single-chip microcomputer 312. In this embodiment, the single-chip microcomputer 312 uses STMH74IIT, and the area array CMOS 311 uses MP9T00.

[0027] In one embodiment, it further includes a light source controller 4. The light source controller 4 is electrically connected to the light source module 21, the focus regulator 22, and the light source receiver 31 respectively. Specifically: The light source receiver 31 adopts a stroboscopic controller, and the stroboscopic controller is electrically connected to the motor, the light source, and the single-chip microcomputer 312 respectively.

[0028] In one embodiment, it further includes a host computer 5. The host computer 5 is electrically connected to the collector 1 and the light source controller 4 respectively. Among them, the collector 1 adopts a camera.

[0029] In one embodiment, it further includes a carrier. The carrier carries the light source receiver 31 and the workpiece to be measured 32; the carrier is electrically connected to the host computer 5.

[0030] Further, the focus adjustment process is as follows: The host computer 5 sends a start command to the light source controller 4, the light source module 21 starts to strobe, the light emitted by the light source module 21 irradiates the area array CMOS 311 after passing through the lens module 221, the area array CMOS 311 receives the optical signal, outputs different electrical signals according to the light intensity, and inputs them to the single-chip microcomputer 312 after AD conversion. The single-chip microcomputer 312 records the spot area currently irradiated on the area array CMOS 311. The light source controller 4 controls the power device 222 to operate, and the lens module 221 moves upward (or downward). The single-chip microcomputer 312 records the spot area when the lens module 221 moves to different positions. If the spot area decreases successively, the system is in the focusing process, as shown in Figure 4(a). If the spot area becomes larger again, the previous position is the best convergence position, as shown in Figure 4(c). At this time, the single-chip microcomputer 312 sends a signal to the light source controller 4, and the power device 222 retreats to the previous position, and the focus adjustment process ends, as shown in Figure 4(b).

[0031] The device in this embodiment can perform real-time focus adjustment during the detection process. If there are concave and convex changes on the surface of the object to be measured, the light source can always be in the best convergence position.

[0032] During the process that the area array CMOS 311 receives the light source module 21, the single-chip microcomputer 312 continuously calculates the received area. When it directly determines that the area starts to change from small to large, it outputs a trigger signal. After receiving the trigger signal, the light source controller 4 controls the light source module 21 and the collector 1 to perform image acquisition (that is, the light source controller 4 synchronously outputs a trigger signal to the collector 1 while controlling the light source module 21 to strobe, and the collector 1 starts to acquire images after receiving the trigger signal). The image acquired by the detection system based on the trigger signal is basically equivalent to the image acquired at the focus position.

[0033] Through the control of the single-chip microcomputer 312, any position can be set as the convergence point.

[0034] When in use, the real-time focusing device fixes the collector 1, the light source module 21 and the focus adjuster 22 integrated in the same housing through a bracket, and the implementation principle is as follows Figure 5 shown. Specifically, the device mainly consists of an ARM processor, a complex programmable logic device CPLD (Complex Programmable Logic Device), and a area array CMOS 311. The host computer 5 sets working parameters for the device through a network port. The area array CMOS 311 is connected to the complex programmable logic device CPLD. The area array CMOS 311 converts the acquired data into 8-bit data. The CPLD preliminarily processes or formats the 8-bit data obtained from the area array CMOS 311. The ARM obtains data from the complex programmable logic device CPLD through a digital camera interface DCMI (Digital Camera Interface), then performs algorithm processing, and outputs a trigger signal. The trigger signal reaches the host computer 5 through the light source receiver 31. The host computer 5 controls the movement of the carrier table to move the workpiece 32 to be measured to the best focus. At the same time, the light source receiver 31 also sends trigger signals to the collector 1 and the light source module 21 respectively, and the camera samples the workpiece 32 to be measured.

[0035] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and reference can be made to the description of the method part for the relevant parts.

[0036] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A real-time focusing device applied to an optical detection system, characterized in that: include: A collector (1), a light source regulator and a light source receiving assembly; the light source regulator comprises a light source module (21) and a focus regulator (22); the light source module (21), the focus regulator (22) and the light source receiving assembly are arranged in sequence on a light path emitted by the light source module (21); the collector (1) is arranged on a reverse extension line of the light path; the light source receiving assembly comprises a light source receiver (31) and a workpiece to be measured (32) located on the same horizontal line.

2. The real-time focusing device for an optical detection system according to claim 1, characterized in that: The focus adjuster (22) comprises a lens module (221) and an adjusting device, and the lens module (221) is fixedly connected to the adjusting device.

3. The real-time focusing device for an optical detection system according to claim 2, characterized in that: The adjustment device comprises a power device (222) and a slide rail (223) fixed on a housing, and a slider (224) disposed in the slide rail (223) and slidably connected to the power device (222); the slider (224) is also fixedly connected to the lens module (221).

4. The real-time focusing device for an optical detection system according to claim 1, characterized in that: The light source module (21) comprises a plurality of light sources (212) and a mounting platform (211); the plurality of light sources (212) are evenly fixed on the mounting platform (211); and the mounting platform (211) is a hollow structure.

5. The real-time focusing device for an optical detection system according to claim 1, characterized in that: The light source receiver (31) comprises an area array CMOS (311) and a single chip computer (312); the area array CMOS (311) is electrically connected to the single chip computer (312).

6. The real-time focusing device for an optical detection system according to claim 1, characterized in that: It also comprises a light source controller (4), wherein the light source controller (4) is electrically connected to the light source module (21), the focus adjuster (22) and the light source receiver (31) respectively.

7. The real-time focusing device for an optical detection system according to claim 6, characterized in that: It also comprises a host computer (5), wherein the host computer (5) is electrically connected to the collector (1) and the light source controller (4) respectively.

8. The real-time focusing device for an optical detection system according to claim 7, characterized in that: It also comprises a carrying platform, the carrying platform carries the light source receiver (31) and the workpiece to be measured (32); the carrying platform is electrically connected to the host computer (5).

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