TWI417517B - Light source for vision measuring machine and positioning system using the same - Google Patents

Description

Image measuring instrument light source and automatic positioning system using the same

The invention relates to an image measuring instrument light source and an automatic positioning system using the same.

The image measuring instrument is a non-contact three-dimensional measuring device, which has the advantages of good flexibility, fast and high efficiency, and generally includes a measuring lens for obtaining an image of the workpiece to be tested and a light source for illuminating the workpiece to be tested, generally The measuring lens is a CCD (Charge Coupled Device) lens and is fixedly connected to the light source.

In order to accurately measure the local size of the workpiece, it is usually necessary to use a larger multiple of the CCD lens to clearly display the local features of the workpiece to be tested. When measuring multiple parts of the workpiece, it is necessary to manually operate the image measuring instrument's driving system to move the light source so that the CCD lens is aligned with each part to be tested, which is inconvenient to operate.

In view of the above, it is necessary to provide an easy-to-use image measuring instrument light source and an automatic positioning system using the same.

A light source for an image measuring instrument, comprising: a body having a continuous perforation along a central axis thereof; the through hole forming a larger first opening at the first end and the second end of the body respectively And a smaller second opening, the inner wall of the through hole includes a light emitting surface extending from the first opening toward the second opening, and the plurality of LEDs are mounted on the light emitting surface, and a main lens for measuring images can be The second opening is mounted in the body, and the body further includes a mounting hole extending through the light emitting surface, and the mounting hole is used for mounting an auxiliary lens.

A lens automatic positioning system is applied to an image measuring instrument, the lens automatic positioning system comprises: a main lens for capturing an image of a workpiece to be tested; a light source fixed to the main lens, the light source is further fixed An image processing module is configured to collect the image captured by the main lens and the auxiliary lens and convert the image into a digital signal; a display module is configured to receive the digital signal of the image processing module and display one at the same time a first window and a second window, wherein the first window displays a clear image of the first part to be tested of the workpiece to be tested captured by the main lens, and the second window displays the to-be-tested by the auxiliary lens a larger range of images of the workpiece; a displacement calculation module, when the second portion to be tested is selected in the second window, the displacement calculation module is based on the second to-be-side portion and the first Calculating the relative displacement of the main lens from the current position to the second to-be-side portion of the workpiece to be tested, and calculating a displacement amount of the side portion in the second window; Calculation Groups obtained displacement amount converted into electric signals to drive the operation of the image measuring instrument, so as to drive the main lens to move to the second test site.

Compared with the prior art, the image measuring instrument light source and the lens positioning system using the light source can conveniently and quickly position the measuring lens to the workpiece to be tested through the conversion relationship between the auxiliary lens coordinate system and the measuring lens coordinate system. The part improves the measurement efficiency.

Referring to FIG. 1 to FIG. 3, a preferred embodiment of the image measuring instrument light source 1 of the present invention is mounted on an image measuring instrument 100, which includes a cylindrical body 10 and is uniformly perforated along a central axis of the body 10. . The through hole defines a larger first opening 11 and a smaller second opening 12 at the first end and the second end of the body 10, respectively. The inner wall of the through hole includes a columnar surface adjacent to the second opening 12 and a tapered light emitting surface 13 extending from the columnar surface toward the first opening 11. A plurality of fastening holes 16 are defined in the columnar surface, and a main lens 30 (shown in FIG. 3 ) can be inserted into the body 10 from the second opening 12 and through a plurality of fixing members that cooperate with the fastening holes 16 . The light source 1 is fixed to the main lens 30. The body 10 is further provided with a mounting hole 14 extending through the light emitting surface 13 for mounting an auxiliary lens 20. The light-emitting surface 13 is provided with an LED (light-emitting diode) 15 which is distributed in a plurality of concentric circles centered on the central axis of the body 10. The LEDs 15 can be divided into a plurality of regions along the circumference and the radial direction. The LEDs 15 of each region are turned on or off by the control unit to perform different angles of illumination on the workpiece to be tested.

The main lens 30 is used as a measuring lens and is a CCD lens having a high magnification to clearly obtain an image of a portion to be tested of the workpiece to be tested to measure the portion to be tested. The auxiliary lens 20 has a larger field of view with respect to the main lens 30, and a panoramic image of the workpiece to be tested can be obtained.

The image measuring instrument 100 includes a table 101 having a horizontal bearing surface, a gantry 103 spanning the table 101, and a top cover 105 fixed to the middle of the gantry 103. The main lens 30 is mounted on the lower end of the top cover 105 and is bored from the second opening 12 and fixed in the light source 1 . The workpiece 35 to be tested can be placed on the bearing surface of the table 101.

Please refer to FIG. 4 , a processor 208 and a display module 200 and the main lens 30 , the light source 1 and the auxiliary lens 20 are formed to automatically position the main lens 30 (ie, the measuring lens) on the measurement part of the workpiece to be tested. Automatic positioning system. The processor 208 is provided with a plurality of ports respectively connected to the main lens 30, the auxiliary lens 20 and the display module 200. In the embodiment, the processor 208 includes an image processing module 201, a displacement calculation module 205, and a driving module 206. The display module 200 is a display. The working process of the automatic positioning system is as follows:

The image processing module 201 captures the image captured by the main lens 30 and the auxiliary lens 20 and converts the image into a digital signal input to the display module 200. The display module 200 can simultaneously display a larger first window and a The smaller second window. And displaying, according to the received digital signal of the image processing module 201, a clear image of the first portion to be tested of the workpiece 35 to be tested captured by the main lens 30 is displayed in the first window. A larger range or panoramic image of the workpiece 35 to be tested captured by the auxiliary lens 20 is displayed in the second window. The first portion to be tested corresponds to a reference point in the second window. The position of the reference point in the second window is determined by the relative position of the main lens 30 and the auxiliary lens 20.

When the second part to be tested is to be measured, the second part to be tested is selected in the second window by clicking or touching the mouse, and recorded as a click point; the displacement calculation module 205, according to the relative positional relationship between the second to-be-side portion and the first to-be-side portion in the second window, that is, the relative positional relationship between the click point and the reference point, calculate that the main lens 30 moves from the current position. The amount of displacement required to align the second to-be-side portion of the workpiece 35; the driving module 206 is configured to convert the displacement amount obtained by the displacement calculation module 205 into an electrical signal to control the driving system of the image measuring instrument 100 Acting to drive the main lens 30 to the position of the second portion to be tested.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

1. . . Image measuring instrument light source

10. . . Ontology

11. . . First opening

12. . . Second opening

13. . . Luminous surface

14. . . Mounting holes

15. . . led

16. . . Card hole

20. . . Auxiliary lens

30. . . Auxiliary lens

35. . . Workpiece to be tested

100. . . Image measuring instrument

101. . . Workbench

103. . . Gantry

105. . . Top cover

200. . . Display module

201. . . Image processing module

205. . . Displacement calculation module

206. . . Drive module

208. . . processor

1 is a perspective view of a preferred embodiment of a light source of the image measuring instrument of the present invention.

Figure 2 is a front elevational view of the image measuring instrument light source of Figure 1.

3 is a perspective view of a preferred embodiment of a light source of the image measuring instrument of the present invention and an image measuring instrument.

4 is a block diagram of a preferred embodiment of the lens automatic positioning system of the present invention.

1. . . Image measuring instrument light source

10. . . Ontology

11. . . First opening

12. . . Second opening

13. . . Luminous surface

14. . . Mounting holes

15. . . led

16. . . Card hole

20. . . Auxiliary lens

Claims (6)

A light source for an image measuring instrument, comprising: a body having a continuous perforation along a central axis thereof; the through hole forming a larger first opening at the first end and the second end of the body respectively And a smaller second opening, the inner wall of the through hole includes a light emitting surface extending from the first opening toward the second opening, and the plurality of LEDs are mounted on the light emitting surface, and a main lens for measuring images can be The second opening is installed in the body, and the improvement is that the body further includes a mounting hole extending through the light emitting surface, and the mounting hole is used for mounting an auxiliary lens. The light source of claim 1, wherein the auxiliary lens has a larger field of view relative to the main lens. The light source of claim 1, wherein the inner wall of the through hole is provided with a plurality of fastening holes near the second opening for fixing the light source to the main lens through the plurality of fixing members. The light source of claim 1, wherein the LEDs are disposed on a concentric circle centered on a central axis of the body, and the LEDs are divided into a plurality of regions along a circumference and a radial direction, each region The LED is turned on or off by a control unit to illuminate the workpiece to be tested at different angles. A lens automatic positioning system is applied to an image measuring instrument, the lens automatic positioning system comprises: a main lens for capturing an image of a workpiece to be tested; a light source fixed to the main lens, the light source is further fixed An image processing module is configured to collect the image captured by the main lens and the auxiliary lens and convert the image into a digital signal; a display module is configured to receive the digital signal of the image processing module and display one at the same time a first window and a second window, wherein the first window displays a clear image of the first part to be tested of the workpiece to be tested captured by the main lens, and the second window displays the to-be-tested by the auxiliary lens a larger range of images of the workpiece; a displacement calculation module, when the second portion to be tested is selected in the second window, the displacement calculation module is based on the second to-be-side portion and the first a relative positional relationship of the side portion in the second window, calculating a displacement amount required for the main lens to move from the current position to the second to-be-side portion of the workpiece to be tested; and a driving module for Displacement meter Module displacement amount obtained is converted into electric signals to drive the operation of the image measuring instrument, so as to drive the main lens to move to the second test site. The lens automatic positioning system of claim 5, wherein the first portion to be tested corresponds to a reference point in the second window before the main lens is moved, and the to-be-tested is selected in the second window. The second part to be tested is recorded as a selected point, and the displacement calculation module calculates the displacement according to the relative positional relationship between the selected point and the reference point.