CN210603216U

CN210603216U - Vision measuring device

Info

Publication number: CN210603216U
Application number: CN201921909504.XU
Authority: CN
Inventors: 武杰杰; 刘志强
Original assignee: Xixian New Area Xipu Intelligent Technology Co Ltd
Current assignee: Xixian New Area Xipu Intelligent Technology Co Ltd
Priority date: 2019-11-07
Filing date: 2019-11-07
Publication date: 2020-05-22
Anticipated expiration: 2029-11-07

Abstract

The utility model belongs to the technical field of vision measurement and discloses a vision measuring device which comprises a parallel light source, wherein the parallel light source generates parallel light beams after passing through a group of optical lenses through a point light source; the product to be detected is placed in the flatness range irradiated by the parallel light beams; the front surface of the projection screen receives contour projection generated after the parallel light source irradiates the part; the lens is used for converging the projection of the object outline on the projection screen onto the target surface of the camera; and the camera is fixedly arranged on the back surface of the projection screen and is used for converting the image into digital information for processing by a computer. The utility model provides an object profile measuring's vision measuring device has detection efficiency height, detects the range big, the system construction cost is low, easy to carry out's advantage.

Description

Vision measuring device

Technical Field

The utility model belongs to the technical field of the vision is measured, especially, relate to a vision measuring device.

Background

Currently, the current state of the art commonly used in the industry is such that: in recent years, with the continuous upgrading of industries, the requirements of industrial production on the quality of products are higher and higher, and the requirements on the size, the surface flatness and the like of the products are also higher. Visual measurement is used as a non-contact rapid measurement means, and can be used for directly detecting a sample, so that the visual measurement is widely applied to industrial production and detection.

At present, most of high-precision vision measuring equipment in the market adopts a telecentric optical system, as shown in figure 1, a telecentric light source is used for providing collimated parallel light beams to irradiate a part, and the outline of the part is projected to an opposite telecentric lens to be converged and then imaged on a camera target surface. Because of the limitation of optical characteristics, the telecentric optical system requires the aperture of the optical lens to be larger than the maximum breadth of the part to meet the measurement requirement, but the manufacturing difficulty, the manufacturing precision, the manufacturing cost and the equipment volume will be greatly increased along with the increase of the size of the telecentric lens, and based on this, the current telecentric measurement system is mostly used for the measurement of parts with smaller sizes, and the measurement field of view is usually not more than 100mmX100 mm. Therefore, there is a need to provide a new vision measuring method and apparatus to solve the above technical problems.

In summary, the problems of the prior art are as follows: the manufacturing difficulty, the manufacturing precision, the manufacturing cost and the equipment volume are greatly increased along with the increase of the size of the telecentric lens.

SUMMERY OF THE UTILITY MODEL

To the problem that prior art exists, the utility model provides a vision measuring device.

The utility model is realized in such a way that the vision measuring device comprises a parallel light source, wherein the parallel light source generates parallel light beams after passing through a group of optical lenses through a point light source;

the product to be detected is placed in the flatness range irradiated by the parallel light beams;

the front surface of the projection screen receives contour projection generated after the parallel light source irradiates the part;

the lens is used for converging the projection of the object outline on the projection screen onto the target surface of the camera;

and the camera is fixedly arranged on the back surface of the projection screen and is used for converting the image into digital information for processing by a computer.

Furthermore, the lens, the camera, the product to be detected and the parallel light source are respectively arranged at two sides of the projection screen.

Furthermore, the point light source emits high-brightness light rays which pass through a group of optical lenses to generate parallel light beams, and the light beams pass through a product to be detected to generate a shadow which is 1:1 of the outline of the product and are projected on a projection screen.

Further, the camera and lens are placed on the back of the projection screen.

Further, the camera and the lens shoot picture information on the projection screen in an imaging range and send the picture information to the computer for processing, the computer software extracts boundary information of the outline through image preprocessing, and then width, height, distance and diameter information needing to be measured is obtained through calculation of a measurement algorithm.

To sum up, the utility model discloses an advantage and positive effect do: the utility model provides a vision measurement method and device of object profile measurement has detection efficiency height, detection range big, the system construction cost is low, easy to carry out's advantage.

Drawings

Fig. 1 is a schematic structural diagram of a profile measuring apparatus provided in the prior art.

Fig. 2 is a schematic structural diagram of a vision measuring device according to an embodiment of the present invention.

Fig. 3 is an effect diagram of the projection of the outline of the product to be measured on the projection screen provided by the embodiment of the present invention.

Fig. 4 is a projection of the outline of the product to be measured on the projection screen according to the embodiment of the present invention.

Fig. 5 is a flowchart of a method for measuring vision on a projection screen according to an embodiment of the present invention.

In the figure: 1. a point light source; 2. a collimated light source; 3. a camera; 4. a lens; 5. a parallel light beam; 6. a product to be tested; 7. a projection screen; 8. the imaging range.

Detailed Description

In order to further understand the contents, features and functions of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings.

To solve the problems in the prior art, the present invention provides a vision measuring method and device, which is described in detail below with reference to fig. 2 to 5.

The vision measuring method and device comprises a telecentric illumination light source, wherein the telecentric illumination light source is used for generating a parallel illumination light beam; the front surface of the projection screen 7 is used for receiving contour projection generated after the telecentric illumination light source irradiates the part; the lens 4 is used for converging the projection of the object outline on the projection screen 7 onto the target surface of the camera 3; the camera 3 is fixedly arranged on the back of the projection screen 7 and converts images into digital information for computer processing.

After parallel light beams 5 generated by the telecentric illumination light source pass through a product 6 to be measured, part of light rays can be shielded by the outline of the product 6 to be measured, and because the parallel light beams 5 can not change the propagation direction, the part shielded by the product 6 to be measured is projected onto a projection screen 7 in a shadow ratio of 1:1, so that the aim of converting a three-dimensional product 6 to be measured into two-dimensional information to be measured is fulfilled, and the measurement is simplified. At this time, only the lens 4 and the camera 3 behind the projection screen 7 are required to collect the shadow on the projection screen 7, and the contour information of the product 6 to be measured can be obtained through corresponding measurement. The shadow boundaries are extracted from the images collected by the lens 4 and the camera 3 through the image preprocessing algorithm, and then the required size information such as width, height, spacing, diameter and the like can be obtained through calculation through the measurement algorithm.

The utility model discloses a vision measuring device includes parallel light source 2, the product 6 that awaits measuring, projection screen 7, camera lens 4, camera 3, wherein parallel light source 2 produces parallel light beam 5 through a hi-lite pointolite 1 behind a set of optical lens piece, because optical characteristic parallel light beam 5 is only at one end length within range flatness best, the measurement accuracy that this scope corresponds is highest, the product 6 that awaits measuring puts promptly in this scope, 2 back-and-forth movement product 6 that awaits measuring of parallel light source in this scope position can not influence measurement accuracy. The lens 4 and the camera 3, the product 6 to be measured and the parallel light source 2 are respectively arranged at two sides of the projection screen 7.

When the device works, high-brightness light emitted by the point light source 1 passes through a group of optical lenses to generate parallel light beams 5, the light beams pass through a product 6 to be measured to generate a shadow which is 1:1 of the product outline and are projected on the projection screen 7, the projected outline shadow can be seen on both sides of the projection screen 7, and in order to avoid the shielding of the product 6 to be measured and simplify the calibration workload of a vision measurement system, the camera 3 and the lens 4 for image acquisition are usually arranged on the back of the projection screen 7. As shown in fig. 2, the camera 3 and the lens 4 disposed on the back of the projection screen 7 capture the image information on the projection screen 7 within the imaging range 8 and send the image information to the computer for processing, the computer software extracts the boundary information of the contour through image preprocessing, and then the information to be measured, such as width, height, spacing, diameter, etc., is obtained through calculation of the measurement algorithm.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all the modifications and equivalents of the technical spirit of the present invention to any simple modifications of the above embodiments are within the scope of the technical solution of the present invention.

Claims

1. The vision measuring device is characterized by comprising a parallel light source, wherein the parallel light source generates parallel light beams after passing through a group of optical lenses through a point light source;

2. The vision measuring device of claim 1, wherein the lens and camera are positioned on opposite sides of a projection screen from the product under test and the parallel light source.

3. The vision measuring device of claim 1, wherein the point light source emits high intensity light through a set of optical lenses to produce parallel beams of light that pass through the product under test to produce a shadow that follows the product contour 1:1 and is projected onto a projection screen.

4. The vision measuring device of claim 1, wherein the camera and lens are positioned on a back side of the projection screen.

5. The vision measuring device of claim 1, wherein the camera and lens take the picture information on the projection screen in the imaging range and send the picture information to the computer for processing, and the computer software extracts the boundary information of the contour through image preprocessing and then obtains the information of the width, height, spacing and diameter to be measured through calculation of the measuring algorithm.