JP2007271561A - Lens shape measuring method of dummy lens, and lens contour enhancing tool thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens shape measuring method capable of measuring easily the lens shape of a dummy lens by a simple work, and to provide a lens contour enhancer therefor. <P>SOLUTION: In this lens shape measuring method of the dummy lens that uses a lens shape measuring device for imaging the dummy lens by a camera, and performing image processing of the imaged lens image, to thereby acquire its lens shape (lens outer shape), the edge of the dummy lens is covered with a band member, formed from an annular thin elastic coat having reduced light transmission property, and having a circumferential length smaller than the circumferential length of the dummy lens and a width larger than the edge thickness of the dummy lens, and emphasizes the dummy lens contour. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a target lens shape measuring method and a lens contour emphasizing tool suitable for optically measuring the outer shape of a dummy lens such as a rimless frame.

  As a method of measuring a dummy lens (demo lens) attached to a rimless frame, a dummy lens illuminated with illumination light is imaged with a camera, and the captured lens image is image-processed to obtain a target lens shape (lens outer shape). (For example, Patent Document 1). For a rimless frame called a two-point frame, a lens shape of the dummy lens can be obtained, a lens image displayed on the monitor can be confirmed, and hole position data for attaching the rimless frame can be input.

In the measurement using the target lens shape measuring apparatus as described above, in order to make it easier to obtain the target lens shape of the transparent dummy lens, by applying paint such as black color with a marker near the periphery of the dummy lens, A method of measuring with an emphasized outline is common.
JP-A-8-252870

  However, the paint method has the following problems. In other words, it takes time to paint with markers, uneven paint paint is likely to occur, and this causes problems such as reading errors and measurement errors with lens lens measuring devices, troublesome work of wiping paint, There was a problem that it was difficult for the paint to permeate the periphery. In addition, a lens having a water repellent coating on the lens surface has a problem that it is difficult to paint.

  In view of the above-described problems of the prior art, it is an object of the present invention to provide a target lens shape measuring method and a lens contour emphasizing tool that can easily measure the target lens shape of a dummy lens with a simple operation.

In order to solve the above problems, the present invention is characterized by having the following configuration.
(1) In the lens shape measuring method of the dummy lens using the target lens shape measuring device that captures the dummy lens with a camera and performs image processing on the captured lens image to obtain the target lens shape (lens outer shape). A band member formed of an annular thin elastic film with low light transmittance, having a circumference shorter than the circumference of the dummy lens and having a width thicker than the edge thickness of the dummy lens, on the periphery of the dummy lens The outline of the dummy lens is emphasized.
(2) In the target lens shape measurement method of (1), when the band member is attached to the periphery of the dummy lens, the front side and the rear side of the dummy lens are inserted into the attachment holes of the rimless frame formed in the dummy lens. It attaches so that the said band member may not hang on at least one.
(3) When measuring using a target lens shape measuring apparatus that acquires a target lens shape (lens outer shape) of the dummy lens by imaging the dummy lens with a camera and processing the captured lens image, the contour of the dummy lens Is a lens contour emphasizing tool used to cover the periphery of the dummy lens, and is composed of a thin band member with reduced light transmission, the band member is formed of an annular elastic film, It has a circumference shorter than the circumference of the dummy lens and a width thicker than the edge thickness of the dummy lens.
(4) In the lens contour emphasizing tool of (3), the band member is longer than the length of the operator's index finger and shorter than the circumference of the cup attached to the surface of the lens when processing the peripheral edge of the spectacle lens. It has a perimeter, and the width is a width that an operator can pick with a finger and cover the front and rear surfaces of the dummy lens.
(5) In the lens contour emphasizing tool according to (4), the band member is flexible so as not to float the dummy lens from the mounting surface in a state of covering the dummy lens.

  According to the present invention, it is possible to easily measure the target lens shape of a dummy lens with a simple operation.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, an example of a target lens shape measuring device for obtaining a target lens shape of a dummy lens will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of a target lens shape measuring apparatus 10. Reference numeral 1 denotes a housing for housing an optical member and a control unit described below. A light source 2 emits white light. Reference numeral 3 denotes a lens table, which is made of a milky white light-transmitting member, and has a diffusion surface on the light source 2 side. The lens table 3 is used as a member for placing the dummy lens L, and the dummy lens L is illuminated with diffuse illumination light. Reference numeral 4 denotes a mirror, and reference numeral 5 denotes a lens, which is a member that guides light transmitted through the dummy lens L to the image sensor 6. The image sensor 6 is connected to the control unit 7, acquires light passing through the dummy lens L as an image, and sends the image to the control unit 7. The control unit 7 performs processing on the acquired image to obtain a target lens shape (peripheral shape) of the dummy lens L. Reference numeral 8 denotes a monitor connected to the control unit 7, and the target lens shape obtained by the control unit 7 and the image of the actual dummy lens L are superimposed and displayed (superimposed display). The monitor 8 has a touch panel function, and it is possible to correct the target lens shape and input the hole position while viewing the target lens shape of the dummy lens L and the actual dummy lens L displayed using a touch pen or the like. it can. By using diffused light as illumination light, an appropriate target lens shape can be obtained even if the lens placed on the lens table 3 has a power.

  FIG. 2 is a diagram showing a rubber band as a lens contour emphasizing tool. In FIG. 2A, the rubber band 20 and the dummy lens L are shown at the same scale. 21a shows the front surface (outside) of the rubber band, and 21b shows the back surface (inside). H1 and H2 of the dummy lens L are holes for fixing the frame, and LE indicates an edge of the dummy lens L. When the rubber band 20 is pulled in the arrow direction (outward direction) in FIG. 2A and the back surface 21b is hooked on the edge LE, the rubber band 20 is placed on the periphery of the dummy lens L as shown in FIG. It is put on.

  The rubber band 20 is a band-shaped member formed in an annular shape by a thin film (thin wall) elastic body having elasticity such as rubber. The circumference of the rubber band 20 is configured to be shorter than the circumference of the dummy lens L. The circumference of the rubber band 20 is preferably longer than the length of the operator's index finger. Furthermore, the circumference of the rubber band 20 is preferably slightly smaller than the circumference of the cup as a processing jig attached to the surface of the lens when processing the peripheral edge of the spectacle lens. That is, the size of the lens mounting cup is the minimum processing size of the spectacle lens. For this reason, when the rubber band 20 is hung on the periphery of the dummy lens L as shown in FIG. 2B, the rubber band 20 fits the edge LE due to the expansion and contraction force of the rubber band 20. This stretchability is such that the operator can easily work to stretch the rubber band 20. Further, since the rubber band 20 has elasticity, the rubber band 20 is less likely to be wrinkled.

  The film thickness of the rubber band 20 is preferably about 0.01 to 0.3 mm. Furthermore, it is preferably about 0.05 to 0.2 mm. The thin film does not protrude from the edge LE. Further, even if wrinkles occur in the rubber band 20, the wrinkles are unlikely to protrude from the edge LE. Even if the film thickness is 0.05 mm or less, it is sufficient if it is durable when stretched.

  Further, when the rubber band 20 is placed on the lens table 3 or the like by covering the dummy lens L with the rubber band 20, the rubber band 20 is covered by the tension of the rubber band 20 that covers a part of the rear surface of the dummy lens L (the side in contact with the lens table 3). It is preferable that the dummy lens L is flexible enough not to float from the lens table 3. This flexibility is related to the aforementioned film thickness and material.

  As shown in the drawing, the width W1 of the rubber band 20 is constant with respect to the circumference, and is formed wider than the thickness (edge thickness) W2 of the dummy lens L. The width W1 is a width that allows an operator to easily apply a finger or the like, and is a width that allows the operator to grip the rubber band 20 with a finger and cover the front surface and the rear surface of the dummy lens L. Is preferred. For example, it is 10-20 mm. In this embodiment, it is 16 mm. Thereby, when the rubber band 20 is hung on the dummy lens L, it becomes easy to hung. Further, the rubber band 20 can be easily hung on the front surface of the dummy lens L. Since the thickness of the dummy lens L is about 2 to 5 mm, when the rubber band 20 is put on the dummy lens L, the rubber band 20 of such an extent that an operator's finger can easily be put on the front and rear surfaces of the dummy lens L is provided. An edge is secured. The width W1 does not necessarily have to be constant at any position of the rubber band 20.

  The rubber band 20 is made of a material having low light transmittance. The light transmittance of the rubber band 20 may be substantially light shielding, but preferably has a characteristic of transmitting about half of white light. The rubber band 20 is made of a material having a certain degree of light transmittance while being a material having low light transmittance as compared with the dummy lens L. Compared to the dummy lens L, it is a material having low light transmissivity, so that when the target lens shape measuring device 10 acquires the target lens shape of the dummy lens L, the illumination light is partially blocked and the periphery of the dummy lens L The contrast becomes higher (periphery is noticeable). Further, the term “having a certain degree of light transmission” as used herein means that light is transmitted to such an extent that the hole position can be confirmed even when the front surface 21a or the rear surface 21b of the rubber band 20 is related to the holes H1 and H2. That is. In addition, it is preferable that the surface 21a and the back surface 21b of the rubber band 20 do not overlap in the vicinity of the holes H1 and H2. In particular, it is preferable that the surface 21a does not cover the front portions of the holes H1 and H2.

  When the dummy lens L to which the rubber band 20 is attached is placed on the lens table 3 and the illumination is turned on with a switch not shown, the screen shown in FIG. 3 is displayed on the monitor 8. Reference numeral 31 denotes a display unit, and an image acquired by the image sensor 6 is directly displayed. The dummy lens L is preliminarily marked with a mark M by a lens meter or the like so that the horizontal direction of the dummy lens L can be determined. The operator moves the dummy lens L on the lens table 3 while looking at the xy axis of the display unit 31, and adjusts the horizontal direction based on the mark point.

  As described above, since the background of the display screen is the lens table 3, it becomes milky white and has high brightness. On the other hand, at the portion of the front surface 21a and the rear surface 21b where the rubber band 20 is applied by the dummy lens L, the light transmittance is reduced and the background is darkly projected. In the portion where the front surface 21a and the back surface 21b overlap, the light transmittance further decreases. In this way, the periphery of the dummy lens L becomes clear and bright, and it becomes easy to obtain the target lens shape by the image processing of the control unit 7.

  In this state, by pressing the measurement button indicated by 32, acquisition of the target lens shape is started. The two-dimensional image of the dummy lens L shown in FIG. 3 is captured again by the image sensor 6 and sent to the control unit 7. The control unit 7 obtains the target lens shape from the periphery of the dummy lens L by calculation based on the image information. This image processing is based on known feature extraction and contour extraction algorithms. Along with the calculation of the target lens shape, coordinates are calculated, and coordinates for the periphery of the dummy lens L are assigned.

  After obtaining the target lens shape of the dummy lens L, the hole position is input. FIG. 4 is a diagram showing a hole position input screen on the monitor 8 after acquiring the target lens shape. Since the relative relationship between the hole position and the target lens shape is important, the hole position is input after obtaining the target lens shape. If a completion button (not shown) is pressed after obtaining the target lens shape, a hole position input screen shown in FIG. 4 is displayed. In FIG. 4, an enlarged view of the periphery of the hole H <b> 1 is shown on the display unit 31. Buttons are arranged at the bottom of the display screen of the monitor 8, and a numeric keypad (not shown) that can be increased or decreased and numerical values can be displayed by pressing the buttons. Reference numeral 41 denotes a zoom button for enlarging or reducing the display unit 31. Reference numeral 42 denotes a hole mode button for setting the hole mode. By pressing the hole mode button 42, a menu for selecting a notch hole, a long hole, a single hole or the like is displayed. 43 is a hole diameter button for changing and inputting the diameter of the hole diameter. Reference numeral 46 denotes a completion button which is pressed to end the hole position input mode.

  In the display unit 31, a front hole H1a and a rear hole H1b are displayed in the hole H1. This is because the dummy lens L has a curved surface, so that the hole positions do not overlap on the front surface and the rear surface of the lens surface. Here, for convenience of explanation, the front hole H1a is indicated by a solid line, and the rear hole H1b is indicated by a broken line. Reference numeral 44 denotes an input hole mark, and the diameter of the input hole mark 44 is changed by the hole diameter button 43. When the input hole mark 44 is selected, it blinks on the screen or changes its color. A straight line 45 extending from the center of the input hole 44 mark is a guide indicating the center of the dummy lens L. By referring to the guide 45, it can be seen that the front hole H1a is a front hole. The operator moves the input hole 44 mark with respect to the front hole H1a with a touch pen or the like, and sets an appropriate hole diameter with the hole diameter button 43. For this reason, it is easier to work when the rubber band 20 is not hung on the front hole H1a of the dummy lens L. The hole position is input as the center coordinates of the input hole 44 mark. In this way, the hole position and the hole diameter are input, and when all hole positions have been input, the completion button 46 is pressed to complete the hole position input.

  As described above, the light transmittance at the periphery of the dummy lens L can be easily reduced, and the reduction of the light transmittance can be easily canceled. That is, by using the rubber band 20, even if it is the transparent dummy lens L, the outline (lens periphery) can be emphasized by a simple operation. According to this method, it is possible to save the trouble of applying ink to the periphery of the dummy lens L and removing the applied ink using a pen. Furthermore, even if the front surface and the rear surface of the dummy lens L are provided with a water-repellent coating, a target lens shape can be obtained without using a pen. Moreover, the reading error of the target lens shape measuring apparatus due to uneven coating can be reduced. Further, the target lens shape of the dummy lens L can be easily obtained by the target lens shape measuring apparatus 10.

  Next, the case of the dummy lens L2 having a notch hole will be described. FIG. 5 is a diagram illustrating a state in which the rubber band 20 is attached to the dummy lens L2 having a notch hole. Of the holes H3, H4, H5, and H6 of the dummy lens L2, H3 and H6 are notch holes formed on the periphery of the dummy lens L2, and H4 and H5 are single holes. When the rubber band 20 is hung on the dummy lens L2 as described above, the front surface 21a and the back surface 21b of the rubber band 20 may overlap the notch holes 3 and H6. At this time, depending on the light transmittance of the rubber band 20, the notch holes H3 and H6 may not be confirmed on the display screen 31. Therefore, as shown in FIG. 5, the rubber band 20 can be applied only to the edge LE of the dummy lens L2 in the vicinity of the notches H3 and H6. This is because the rubber band 20 is annular and has a circumference shorter than that of the dummy lens L2, and is formed of a stretchable elastic film. For this reason, even if the dummy lens L2 is moved to the display unit 31, the shapes of the notch holes H3 and H6 can be sufficiently confirmed.

  In the rubber band 20 described above, in the state illustrated in FIG. 2A, the rubber band 20 has an annular shape that is cut up and down, but this has a lid (or bottom) on one of the top and bottom, and an opening portion. It may be a cap-like structure in which there is one.

  In the embodiment of the lens contour emphasis tool described above, the annular rubber band 20 is used to surround the periphery of the dummy lens L. However, the embodiment is not limited to the annular shape. It may be in the form of a tape with no band connected. FIG. 6 is a diagram illustrating a tape band 50 formed in a tape shape. As shown in FIG. 6A, a tape band 50 is wound around the edge LE of the dummy lens L. As shown by the arrows in the figure, the periphery of the dummy lens L can be covered by overlapping the end of the tape band 50 on the tape band 50. The tape band 50 is preferably formed in a tape shape with a thin material having light transmittance similar to that of the rubber band 20 and having stretchability or developability. Moreover, the tape band 50 has adhesiveness, and has a property of being brought into close contact by bringing the tape bands 50 into contact with each other. For this reason, the tape band 50 can be fitted to the edge LE by winding the tape band 50 so as to cover the dummy lens L while applying tension. The width and thickness of the tape band 50 may be the same as those of the rubber band 20.

  In addition, it is good also as a structure which apply | coats adhesive glue to the back surface of the tape band 50, and affixes the tape band 50 on the dummy lens L. FIG.

  FIG. 6B is a diagram for explaining the acquisition of the target lens shape of the dummy lens L around which the tape band 50 is wound. Reference numeral 51 denotes an overlap of the tape bands 50. The overlap 51 may cause noise during image processing when acquiring the target lens shape, but may not cause noise by making the tape band 50 a thin film, for example, 0.2 mm or less. However, even if the overlap 51 becomes noise in image processing, a configuration that can correct the target lens shape measuring device 10 may be provided. Although not shown, a correction switch may be provided on the display screen of the monitor 8 to enlarge the overlap 51 and add a function of sliding the actual dummy lens L image and the target lens shape obtained by calculation. . The tape band 50 may be one that does not have stretchability or extensibility.

It is the figure which showed schematic structure of the target lens shape measuring apparatus. It is a figure which shows the rubber band which is embodiment of a semi-invention. It is a figure which shows the screen which displayed the dummy lens L to which the rubber band 20 was attached. It is the figure which showed the method of inputting a hole position on the display screen of FIG. It is the figure which showed the target lens shape measurement in the case of a notch hole. It is a figure explaining the tape band.

Explanation of symbols

10 Lens shape measuring device 20 Rubber band 50 Tape band Dummy lens L
H1, H2, H4, H5 hole H3, H6 Notch hole

Claims (5)

In the lens shape measurement method of the dummy lens using the target lens shape measuring device that captures an image of the dummy lens with a camera and performs image processing on the captured lens image to obtain the target lens shape (lens outer shape).
A band member, which is formed of an annular thin elastic film with low light transmittance and has a circumference shorter than the circumference of the dummy lens and a width thicker than the edge thickness of the dummy lens, covers the periphery of the dummy lens. A method for measuring a target lens shape, wherein the outline of the dummy lens is emphasized. 2. The method for measuring a target lens shape according to claim 1, wherein when the band member is attached to the periphery of the dummy lens, the attachment member of the rimless frame formed in the dummy lens is attached to at least one of the front side and the rear side of the dummy lens. A method for measuring a target lens shape, wherein the band member is attached so as not to be hung. A dummy lens is imaged with a camera, and the image of the captured lens image is processed to obtain a lens shape (lens outer shape) of the dummy lens. In measurement using the target lens shape measuring device, the contour of the dummy lens is emphasized. For this purpose, a lens contour emphasizing tool used on the periphery of the dummy lens,
The band member is formed of a thin band member having low light transmittance, the band member is formed of an annular elastic film, has a circumference shorter than the circumference of the dummy lens, and has a width thicker than the edge thickness of the dummy lens. Lens contour enhancer characterized by having. 4. The lens contour emphasizing tool according to claim 3, wherein the band member has a circumferential length shorter than a circumferential length of a cup attached to the surface of the lens when the peripheral edge of the spectacle lens is processed, and is longer than the length of the operator's index finger. The lens contour emphasizing tool according to claim 1, wherein the width is a width that can be picked by a worker with a finger and placed on the front and rear surfaces of the dummy lens. 5. The lens contour emphasizing tool according to claim 4, wherein the band member has flexibility so as not to float the dummy lens from a mounting surface in a state of covering the dummy lens.