TW201632857A - Curved lens inspection method - Google Patents

Abstract

A curved lens inspection method comprises the following steps: utilizing a lens holder of an inspection apparatus to hold a curved lens such that there is no relative movement between the lens holder and the curved lens; obtaining relative height data of the curved lens via a height measurement mechanism, and obtaining relative displacement data of the curved lens according to displacement of the lens holder with respect to the height measurement mechanism; corresponding obtained relative height data to relative displacement data during the lens holder located at the same position in order to form lens coordinate information; according to lens coordinate information, capturing an image of the curved lens via an image capturing device; and analyzing the image of the curved lens by corresponding to lens coordinate information, thereby further precisely analyzing and showing defects of the curved lens.

Description

Curved lens detection method

The present invention relates to a detection method, and more particularly to a method of detecting a curved lens.

Generally, the spectacle lenses have smooth curved surfaces, and the surfaces of other objects such as windshields and glass panels of hand-held electronic products have the same characteristics. Traditionally, the detection of curved lenses is generally judged by the artificial naked eye, so the accuracy of the detection cannot be guaranteed.

With the advancement of technology, a two-dimensional image detection method has been used for lenses, which will first locate the lens. However, most of the curved lenses have no obvious positioning features, and under the framework of dynamic motion detection, the wrong detection angle of view may cause the contrast of the flaw to be insufficient or concealed, and the difficulty of automatic detection and the detection error are increased. Moreover, the image capturing position is difficult to plan in advance due to various causes of lens production. Therefore, the current detection method not only causes the detection time to increase, but also the detection quality is difficult to control.

In view of this, the inventor has invested a lot of research and development energy and spirit, and has continuously made breakthroughs and innovations in this field. He hopes to solve the shortcomings of the application with novel technical means, in addition to bringing more good products to the society and promoting industrial development.

The main object of the present invention is to provide a curved lens detecting method for detecting the flaw of a curved lens. The method comprises the following steps: (a) holding a curved lens by using a lens holding member of a detecting device to make the lens holding member There is no relative transport between the curved lenses (b) obtaining a relative height data of the curved lens by a height measuring mechanism, and obtaining a relative displacement data of the curved lens by displacement of the lens holding member with respect to the height measuring mechanism; (c) the lens The relative height data obtained by the holding member at the same position is corresponding to the relative displacement data to form a lens coordinate information; (d) according to the lens coordinate information, the image of the curved lens is captured by an image capturing device; e) Analyze the image of the curved lens corresponding to the lens coordinate information.

Preferably, before step (b), the type of curved lens is further input into the detecting device.

Preferably, after step (c), the category of the curved lens is further determined based on the lens coordinate information.

Preferably, the height measuring mechanism is a probe or a laser mechanism.

Preferably, in step (b), relative displacement data is obtained by displacement of the lens holder and/or displacement of the height measuring mechanism.

Preferably, the displacement of the lens holder is selected from one of X-direction displacement, Y-direction displacement, X-axis rotational displacement, and Y-axis rotational displacement, or a combination thereof.

Preferably, in step (d), the image capturing device respectively captures images of a plurality of portions of the curved lens.

Preferably, after step (d), the method further comprises the step of combining the plurality of images of the curved lens into the image of the single curved lens according to the lens coordinate information.

Preferably, after step (e), the step of calibrating a problem area on the image of the curved lens is further included.

Preferably, after the step (e), the method further comprises the step of determining that the curved lens is a defective product when the image of the curved lens exceeds a reference value.

Preferably, in step (d), a light source is further used to project on the curved lens.

The present invention uses the relative height data of a plurality of position points of the curved lens The relative displacement data is correspondingly formed into the lens coordinate information of the curved lens, and the relative displacement data may include the Z-direction displacement, the X-direction displacement, the Y-direction displacement, the X-axis rotational displacement, and the Y-axis rotational displacement, so the present invention The obtained lens coordinate information can more fully and accurately represent the coordinate information of many position points on the curved lens. Moreover, the invention analyzes the image of the curved lens according to the lens coordinate information, and can more fully and accurately represent the coordinate information of the curved lens, thereby improving the accuracy of the curved lens detection.

In order to further understand the technology, method and effect of the present invention in order to achieve the intended purpose, reference should be made to the detailed description and drawings of the present invention. The drawings are to be considered in all respects as illustrative and not restrictive

100‧‧‧Testing equipment

1‧‧‧ lens holder

2‧‧‧ Height measuring mechanism

3‧‧‧Image capture device

4‧‧‧Z-direction drive mechanism

41‧‧‧ Fixed seat

5‧‧‧X direction drive mechanism

51‧‧‧ screw

52‧‧‧ Fixed seat

6‧‧‧Y direction drive mechanism

61‧‧‧ screw

7‧‧‧X axial rotary drive mechanism

8‧‧‧Y axial rotary drive mechanism

9‧‧‧Computer equipment

91‧‧‧Control Module

92‧‧‧Image capture module

93‧‧‧Image Processing Module

94‧‧‧Image Analysis Module

A‧‧‧ problem area

Db‧‧‧ database

F‧‧‧瑕疵

G‧‧‧ curved lenses

I1‧‧‧ Relative height data

I2‧‧‧ Relative displacement data

I3‧‧‧ lens coordinate information

I4‧‧‧Lens category information

I5‧‧‧Lens image information

L‧‧‧Laser light

M, M1, M2, M3, M4, M5, M6‧‧ images

P1, P2, P3‧‧‧ slide table

S‧‧‧ screen

1 is a flow chart of a method of detecting a curved lens according to an embodiment of the present invention.

2 is a flow chart of a method of detecting a curved lens according to another embodiment of the present invention.

Fig. 3 is a perspective view showing a detecting apparatus for carrying out a curved lens detecting method according to an embodiment of the present invention.

Fig. 4 is a schematic view showing the lens coordinate information corresponding to the curved lens detecting method according to an embodiment of the present invention.

Fig. 5 is a schematic view showing the image of the curved lens taken by the curved lens detecting method according to an embodiment of the present invention.

Fig. 6 is a schematic view showing an image of a plurality of portions of a curved lens taken by a method for detecting a curved lens according to an embodiment of the present invention.

Figure 7 is a schematic view of an image of a curved lens according to an embodiment of the present invention.

Figure 8 is a diagram showing the problem area of the image calibration of the curved lens of one embodiment of the present invention. intention.

Certain terms are used with reference to the particular components, and the following claims. It is well known to those skilled in the art that manufacturers can use different named reference components. This document is not intended to identify components that differ in name but not function. In the following embodiments and patents, the terms "include" and "include" are used in an open-ended manner and are therefore to be construed as meaning "including, but not limited to".

Referring to Fig. 1, there is shown a flow chart showing a method of detecting a curved lens according to an embodiment of the present invention. The method for detecting the curved lens of the present invention will be described below with reference to Figs. 3 to 5.

The curved lens detecting method of the present invention is used for detecting the flaw of a curved lens G. The curved lens detecting method can be applied to a detecting device 100. The detecting device 100 includes a lens holding member 1, a height measuring mechanism 2, an image capturing device 3, a Z-direction driving mechanism 4, an X-direction driving mechanism 5, and a Y-direction driving. The mechanism 6, the X-axis rotary drive mechanism 7, the Y-axis rotary drive mechanism 8, and a computer device 9.

The curved lens detecting method comprises the steps of: holding a curved lens by using a lens holding member of a detecting device so that there is no relative movement between the lens holding member and the curved lens (step S10); obtaining a curved surface by a height measuring mechanism One of the relative height data of the lens, and the relative displacement data of the curved lens is obtained by the displacement of the lens holding member relative to the height measuring mechanism (step S20); and the relative height data obtained when the lens holding member is at the same position Forming a lens coordinate information corresponding to the relative displacement data (step S30); capturing an image of the curved lens by an image capturing device according to the lens coordinate information (step S40); analyzing the curved lens corresponding to the lens coordinate information Image (step S50).

Specifically, first, the curved lens G to be detected is held by the lens holder 1 (step S10), as shown in FIG. In the present embodiment, the lens holder 1 is a jig that holds the curved lens G in a clamping manner. Of course, the present invention is not limited thereto, and the lens holder 1 can also be other objects, such as a fixing seat, as long as the curved lens G can be stabilized, so that there is no relative movement between the lens holding member 1 and the curved lens G.

Next, the relative height data of one of the curved lenses G is obtained by the height measuring mechanism 2, and the relative displacement data of the curved lens G is obtained by the displacement of the lens holding member 1 with respect to the height measuring mechanism 2 (step S20). . In the present embodiment, the height measuring mechanism 2 is a laser device that emits laser light L to detect the curved lens G. And by the action of a Z-direction driving mechanism 4, the height measuring mechanism 2 can move up and down with respect to a fixing seat 41 in the height direction (ie, the Z direction) along with a sliding table P1. In the present embodiment, the Z-direction drive mechanism 4 is a linear motor. Therefore, the momentum of the Z-direction driving mechanism 4 when the laser beam L is detected to the curved lens G is transmitted back to a database Db of a computer device 9 (Fig. 4) (refer to Fig. 5) , a relative height data I1 of the curved lens G can be obtained. However, the present invention is not limited thereto, and in other embodiments, the height measuring mechanism 2 may also be a probe.

In addition, an X-direction driving mechanism 5 drives a sliding table P2 to move left and right relative to a fixed seat 52 along a length direction of the screw 51 (ie, the X direction), and drives a sliding by a Y-direction driving mechanism 6. The table P3 moves back and forth relative to the slide table P2 along the length direction of the screw 61 (ie, the Y direction), and drives the lens holder by an X-axis rotation drive mechanism 7 and/or a Y-axis rotation drive mechanism 8. 1 is rotated in the X-axis (ie, the α-direction) and/or the Y-axis (ie, the β-direction) with respect to the slide table P3. Moreover, the height measuring mechanism 2 will record the relative height data I1 of the position point after the lens holder 1 is displaced.

The X-direction drive mechanism 5, the Y-direction drive mechanism 6, the axial rotary drive mechanism 7, and the Y-axis rotary drive mechanism 8 also transmit the actuation amount back to the database Db of the computer device 9, the computer The driving force of the X-direction driving mechanism 5, the Y-direction driving mechanism 6, the axial rotation driving mechanism 7, and the Y-axis rotation driving mechanism 8 which are different between the relative height data I1 of each position point obtained by the device 9 Calculated, the relative displacement data I2 of the curved lens G corresponding to the displacement of the lens holder 1 with respect to the height measuring mechanism 2 can be obtained. That is, the displacement of the lens holder 1 in the relative displacement data I2 may be selected from one of X-direction displacement, Y-direction displacement, X-axis rotational displacement, and Y-axis rotational displacement, or a combination thereof. Of course, the present invention is not limited thereto. In other embodiments, the relative displacement data I2 may also include the displacement of the height measuring mechanism 2, as long as the displacement between the lens holding member 1 and the height measuring mechanism 2 is included in the relative displacement. Information I2.

Then, the computer device 9 associates the relative height data I1 obtained when the lens holder 1 is at the same position with the relative displacement data I2 to form a lens coordinate information I3 (step S30). That is to say, the lens coordinate information I3 is a 5-dimensional information including a Z-direction distance, an X-direction distance, a Y-direction distance, an X-axis rotational curvature distance, and a Y-axis between a plurality of position points on the curved lens G. Rotational curvature distance, so the lens coordinate information I3 obtained by the present invention can more completely and accurately represent the curved lens G compared to the conventional one-dimensional line scan (Linescan) or two-dimensional area scan (Areascan). Coordinate information on most of the locations.

Referring to FIG. 2, in the preferred embodiment, before step S20, the computer device 9 of the curved lens G of the type of the detecting device 100 may be input in advance (step S5). The control module 91 of the computer device 9 presets the actuation range of the slides P1, P2, and P3 according to the type of the curved lens G to increase the extraction efficiency of the relative height data I1 and the relative displacement data I2. Alternatively, after the step (S30), the computer device 9 can further determine the type of the curved lens G according to the lens coordinate information I3, and obtain the lens type information I4 of the curved lens G, so as to facilitate the subsequent manufacture of the curved lens G for the same batch. The action range of the slides P1, P2, and P3 is preset according to the lens type information I4, and the efficiency of extracting the relative height data I1 and the relative displacement data I2 is improved.

After obtaining the lens coordinate information I3, next, according to the lens coordinate information I4, the image of the curved lens G is captured by an image capturing device 3 (step S40). In this embodiment, the image capturing module 92 captured by the image capturing device 3 is stored as a lens image information I5 of the database Db through the image capturing module 92 of the computer device 9. Preferably, a light source (not shown) can be used to project on the curved lens G. According to the characteristics of the curved lens G (such as light transmittance), a light source of different wavelengths can be selected to obtain the light source penetrating the curved lens G. Better image capture effect.

Referring to FIG. 2, in a preferred embodiment, in order to achieve a clearer image capturing effect, in step S40, the image capturing device 3 captures images of a plurality of portions of the curved lens G, respectively. . As shown in FIG. 6, the image capturing device 3 captures images M1, M2, M3, M4, M5, and M6 of a plurality of portions of the curved lens G, respectively. Then, the method further includes the steps of combining the plurality of images M1, M2, M3, M4, M5, and M6 of the curved lens G into the image M of the single curved lens G according to the lens coordinate information I3 (as shown in FIG. 7). (Step S45). In this embodiment, the image processing module 93 of the computer device 9 combines a plurality of images M1, M2, M3, M4, M5, and M6 of the lens image information I5 in the database Db into a single image M. . Moreover, the images M, M1, M2, M3, M4, M5, and M6 can also be displayed on the screen S of the computer device 9 for the examiner to view.

After capturing the image M of the curved lens G (step S40), the image analysis module 94 of the computer device 9 analyzes the image M of the curved lens G in the lens image information I5 corresponding to the lens coordinate information I3 in the database Db. (Step S50), whereby the flaw F on the curved lens G, including scratches, filaments, dirt, and the like, can be known. Similarly, since the lens coordinate information I3 is a 5-dimensional information, it includes a Z-direction distance, an X-direction distance, a Y-direction distance, an X-axis rotational curvature distance, and a Y-axis between a plurality of position points on the curved lens G. Rotational curvature distance, so the lens coordinate information I3 obtained by the present invention can more completely and accurately represent the curved lens G compared to the conventional one-dimensional line scan (Linescan) or two-dimensional area scan (Areascan). The coordinates of F News.

Referring to FIG. 2, in a preferred embodiment, after analyzing the image M of the curved lens G (step S50), the image analysis module 94 may be further included to calibrate a problem area on the image M of the curved lens G. The step of A (step S51), as shown in Fig. 8, allows the examiner to more easily find the point F of the curved lens G. After step S50, the image analysis module 94 may further include a step of determining that the curved lens G is a defective product when the image M of the curved lens G exceeds a reference value (step S52), thereby replacing the manner of manually determining the defective product. Improve product quality.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalents of the present invention and the equivalents of the drawings are all included in the present invention. Within the scope of protection, it is given to Chen Ming.

Claims (11)

A curved lens detecting method for detecting a curved surface of a curved lens, the method comprising the following steps: (a) holding the curved lens by using a lens holding member of a detecting device, so that the lens holding member and the curved surface There is no relative motion between the lenses; (b) obtaining a relative height data of the curved lens by a height measuring mechanism, and obtaining one of the curved lenses by displacement of the lens holding member relative to the height measuring mechanism Relative displacement data; (c) the relative height data obtained when the lens holder is at the same position is corresponding to the relative displacement data to form a lens coordinate information; (d) according to the lens coordinate information, by An image capturing device captures an image of the curved lens; and (e) analyzing the curved lens image corresponding to the lens coordinate information. The curved lens detecting method according to claim 1, wherein before the step (b), the type of the curved lens is further input to the detecting device. The curved lens detecting method according to claim 1, wherein after the step (c), the type of the curved lens is further determined according to the lens coordinate information. The curved lens detecting method according to claim 1, wherein the height measuring mechanism is a probe or a laser mechanism. The curved lens detecting method according to claim 1, wherein in step (b), the relative displacement data is obtained by displacement of the lens holding member and/or displacement of the height measuring mechanism. The curved lens detecting method according to claim 5, wherein the displacement of the lens holding member is selected from one of an X-direction displacement, a Y-direction displacement, an X-axis rotational displacement, and a Y-axis rotational displacement or Its combination. The method for detecting a curved lens according to claim 1, wherein in the step (d), the image capturing device respectively captures images of a plurality of portions of the curved lens. The curved lens detecting method according to claim 7, wherein after the step (d), the method further comprises the step of combining the plurality of images of the curved lens into the image of the single curved lens according to the lens coordinate information. The method for detecting a curved lens according to claim 1, wherein after the step (e), the step of calibrating a problem region on the image of the curved lens is further included. The method for detecting a curved lens according to claim 1, wherein after the step (e), the method further comprises the step of determining that the curved lens is a defective product when the image of the curved lens exceeds a reference value. The curved lens detecting method according to claim 1, wherein in the step (d), a light source is further projected onto the curved lens.