JP3939903B2 - Eyeglass lens alignment method and layout block device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a spectacle lens positioning technique, and in particular, a spectacle lens of a spectacle lens in which a processing center position of a spectacle lens such as a bifocal lens formed with a small lens for near use is obtained and a processing jig is attached to the processing center position. The present invention relates to an alignment method and a layout block device.
[0002]
[Prior art]
When the unprocessed spectacle lens is mounted on the spectacle frame desired by the wearer, the spectacle lens is trimmed in accordance with the shape of the spectacle frame. At that time, the eyeglass lens eye point is processed as the processing center so that the pupil center of the wearer coincides with the eyepoint of the eyeglass lens. Since the eye point of a spectacle lens cannot be displayed directly on the lens surface, the geometric center of the lens, the position of the eye point, etc. can be derived from the shape of a nearby lens in the design of spectacle lenses, especially bifocal lenses. I am doing so.
[0003]
FIG. 7A shows a plan view of an unprocessed bifocal lens, and FIG. 7B shows a side view. 100 is a plastic bifocal lens, 101 is a geometric center, 102 is a horizontal reference line passing through the geometric center 101, 103 is a ball, 104 is a small ball, 105 is the center of a distance power measurement unit, and 106 is near The center of the power measurement unit 107 is an eye point.
[0004]
In the case of a plastic lens, the small balls 104 are formed on the surface of the table ball 103 so that the shape seen from the side is a wedge shape, and the upper edge 108 is below the horizontal reference line 102 by a predetermined distance d1 (for example, 5 mm). It is formed so as to leave only. In the case of the left-eye lens, the small ball 104 is formed such that the center 106 of the near vision power measurement unit is shifted from the geometric center 101 to the left by a distance d2 (for example, 5 mm). Therefore, it can be identified whether the lens 104 is a left-eye lens or a right-eye lens by knowing whether the small balls 104 are biased to the left or right.
[0005]
The position of the eye point 107 is determined at a position shifted from the geometric center 101 to the small ball 104 side by a distance d3 (for example, 2.5 mm) on the horizontal reference line 102. Accordingly, by finding the center of the upper edge 108 of the small ball 104, the positions of the geometric center 101 and the eye point 107 can be obtained. When searching for the position of the eye point 107 from the contour shape of the small ball 104, the bifocal lens 100 is placed on a sheet for a bifocal lens called a remark chart. The remark chart displays a full-size bifocal lens for each lens type that describes the position of the small ball, geometric center, distance power measurement center, near power measurement center, and eye point. Is.
[0006]
When the bifocal lens 100 is placed on the remark chart, the position of the small ball 104 of the lens 100 is matched with the position of the small lens of the same type of lens described on the remark chart. The position of the eye point described in 1 is set as the position of the eye point 107, and the same position of the bifocal lens 100 is marked with a marker. Then, a processing jig (lens holder) is mounted at the position of the eye point 107 of the bifocal lens 100, and the eye point 107 so that the center of the wearer's pupil coincides with the eye point 107 of the bifocal lens 100. The bifocal lens 100 is trimmed with the processing center as the processing center, and the outer shape of the lens 100 is matched with the frame shape of the spectacle frame.
[0007]
As another method for searching for the position of the eye point 107 from the contour shape of the small ball 104, a spectacle lens positioning device disclosed in Japanese Patent Laid-Open No. 6-79600 is known. This alignment device captures the processing target bifocal lens 100 with a video camera, displays the contour image of the shot small lens 104 of the bifocal lens 100 on the screen of the television monitor, and stores it in advance. The contour image data of the small balls 104 is calculated from the processing information of the bifocal lens 100, and the calculated contour image is displayed as a reference image at a reference position on the screen of the television monitor.
[0008]
The operator moves the slide table on which the bifocal lens 100 is placed so that the actual image of the contour line of the small ball 104 projected on the screen of the television monitor and the reference image overlap each other, thereby the bifocal lens. Position 100 to where it should be. After the positioning, the pad printer of the marking device transfers the cross mark corresponding to the processing reference line to a predetermined position of the bifocal lens 100. As described above, the alignment device disclosed in Japanese Patent Laid-Open No. 6-79600 performs alignment of the bifocal lens 100 while looking at the screen of the television monitor instead of the remark chart.
[0009]
[Problems to be solved by the invention]
However, in the method using the above remark chart, since the operator performs the work manually, there is a problem that the operator is inefficient and the burden on the operator is large, and the alignment error between the bifocal lens 100 and the lens holder is large. There was a point.
In addition, in the alignment apparatus disclosed in Japanese Patent Laid-Open No. 6-79600, the labor of marking the bifocal lens 100 by the operator can be saved. However, there is a problem that the burden on the operator is heavy as in the case of the remark chart.
[0010]
The present invention has been made to solve the above-described problems, and a spectacle lens positioning method capable of performing highly accurate positioning between a bifocal lens and a lens holder more efficiently and in a shorter time than in the past. An object is to provide a layout block device.
[0011]
[Means for Solving the Problems]
  The method for aligning spectacle lenses according to the present invention includes a procedure for capturing and binarizing an image of a spectacle lens (100) to be processed, and geometric feature parameters of individual figures included in the binarized image. Extract the figure whose feature parameter meets the predetermined condition.To be processedThe procedure of extracting as an image (ST) of the upper edge of the small ball (104) formed in advance on the spectacle lens, and the upper edge of the extracted small ballUsing the center position as the reference position of the eyeglass lens to be processedProcedure to obtain on binary imageObtaining a minimum rectangle including the upper edge of the small ball on the binary image, and obtaining an angular deviation of the eyeglass lens to be processed with respect to a horizontal reference line based on the position of the rectangle; Among the layout data representing the positional relationship between the reference position and the processing center position, the layout data corresponding to the processing target spectacle lens is subjected to angle correction according to the angular deviation, and the layout after the angle correction A procedure for determining a processing center position of the eyeglass lens to be processed based on data and a reference position of the eyeglass lens to be processed;It is what has. Since there is a positional regulation common to all spectacle lenses between the upper edge of the eyeglass lens and the reference position, if the upper edge of the eyeglass lens is detected by image processing, the reference position of the eyeglass lens is determined. Can be sought. The relationship between the reference position and the processing center position differs for each spectacle lens, and the processing center position is calculated using layout data for each lens.Further, by obtaining the smallest rectangle including the upper edge of the small ball, the angle formed by this rectangle and the horizontal reference line (102) indicating the normal position of the spectacle lens can be obtained, and after angle correction is performed. The processing center position of the spectacle lens can be obtained.
  In addition, one configuration example of the method for aligning spectacle lenses according to the present invention irradiates the spectacle lens having a step at the boundary between the ball (103) and the small ball (104) with illumination light from one surface side. By taking an image of the spectacle lens from the other surface side, an image of only the upper edge of the outline of the small ball is obtained. If an attempt is made to detect the reference position or angular deviation of the spectacle lens by image processing based on the entire contour of the small ball, the processing becomes complicated and the detection accuracy becomes uncertain. By obtaining an image of only the upper edge of the small ball, it becomes easy to detect the reference position and angular deviation of the spectacle lens by image processing.
[0012]
  AlsoIn the configuration example of the eyeglass lens positioning method of the present invention, the binary image is rotated in accordance with the angle shift so that the upper edge of the small ball becomes horizontal, and the upper edge of the small ball in the binary image after the rotation processing is rotated. Based on the position, it is determined whether the spectacle lens is a right-eye lens or a left-eye lens. If there is an angle shift in the spectacle lens, an error occurs in the left / right determination, but the left / right determination can be correctly performed by rotating the binarized image.
  In addition, according to one configuration example of the eyeglass lens positioning method of the present invention, a minimum rectangle including the upper edge of a small ball is obtained on a binary image, and the center position of the rectangle and the gravity center position of the upper edge of the small ball are determined. Thus, the upper and lower sides of the spectacle lens are determined. When the eyeglass lens is supplied to the layout block device in the upside down state, the center of gravity (D) is below the center (C). Thereby, the upper and lower sides of the spectacle lens can be determined.
  In addition, according to one configuration example of the method for aligning spectacle lenses of the present invention, when the elapsed time of image processing related to the spectacle lens to be processed exceeds a predetermined time, the spectacle lens to be processed is laid out. -It has a procedure for discharging from the block device.
[0013]
  In addition, the present inventionThe photographing means (5) for photographing an image of the eyeglass lens to be processed, the image processing means (6) for processing the image, the arithmetic means (9) for obtaining the processing center position of the eyeglass lens, and the processing A spectacle lens layout block device having a mechanism for attaching a processing jig to a central position, wherein the image processing means binarizes an image photographed by the photographing means and is included in the binarized image. A geometric feature parameter of each figure is extracted, and a figure in which the feature parameter satisfies a predetermined condition is extracted as an image of the upper edge of a small ball previously formed on the spectacle lens, and the upper edge of the extracted small ball is extracted. Is determined on the binary image as a reference position of the eyeglass lens to be processed, a minimum rectangle including the upper edge of the small ball is determined on the binary image, and based on the position of the rectangle, An angle shift of the eyeglass lens to be processed with respect to a flat reference line is obtained, and the calculation means stores in advance layout data representing a positional relationship between a reference position and a processing center position for each eyeglass lens, and the eyeglass lens to be processed The layout data corresponding to the angle is corrected according to the angle deviation, and the processing center position of the processing target spectacle lens is obtained based on the layout data after the angle correction and the reference position of the processing target spectacle lens.Is.
  Further, the eyeglass lens layout block device of the present inventionFurther includes control means for discharging the eyeglass lens to be processed when an error occurs, and the image processing means has an elapsed time of image processing relating to the eyeglass lens to be processed exceeds a predetermined time. In addition, the control unit notifies the control unit of an error that prevents image processing, and the control unit ejects the eyeglass lens to be processed from the layout block device when receiving the notification of the image processing disabled error.Is a thing.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a bifocal lens layout block device according to an embodiment of the present invention. The bifocal lens layout block device according to the present embodiment is installed adjacent to an edge trimming device (not shown), and images the bifocal lens 100 and based on the captured image. Layout processing for calculating the mounting position and mounting angle of a processing jig (hereinafter referred to as a lens holder) attached to the bifocal lens 100 at the same time as determining the left and right of the bifocal lens 100, and the lens holder as a bifocal lens Block processing attached to the processing center of 100 is performed, and the bifocal lens 100 after the lens holder is attached is conveyed to the edging apparatus.
[0015]
This layout block device supplies a holder supply device 1 for supplying lens holders one by one, a seal supply device 2 for supplying elastic seals to be described later, and a bifocal lens 100 to be processed one by one. The lens supply device 3 to be used, the holder holding device 4 for attaching the lens holder supplied from the holder supply device 1 to the processing center of the bifocal lens 100, and the bifocal lens 100 supplied from the lens supply device 3 are photographed. A lens meter 5 serving as a photographing unit, an image processing device 6 for determining the right and left of the bifocal lens 100 based on an image photographed by the lens meter 5, and calculating the attachment position and attachment angle of the lens holder, and the lens holder A lens conveying device 7 for conveying the bifocal lens 100 after the lens is attached to the edging apparatus, and a layout block A control unit 8 for controlling the entire click device, and a host computer 9 as a calculating means for controlling a layout block apparatus and edger.
[0016]
FIG. 2 is a side view showing a state in which a lens holder is attached to the bifocal lens 100 via an elastic seal based on the result of image processing by the image processing device 6. The lens holder 200 made of a metal such as stainless steel is molded into a cylindrical body with a flange. The surface of the lens holder 200 to which the elastic seal 201 is attached (the lower surface of the holder 200) is a concave spherical lens holding surface corresponding to the convex lens surface of the bifocal lens 100.
[0017]
In this case, when the lens holding surface corresponding to the convex curve is formed for each lens, the type of the lens holder 200 increases. Therefore, by changing the radius of curvature of the lens holding surface in stages, the type of the lens holder 200 is increased. The number of bifocal lenses 100 having different convex curves can be held by one type of lens holder 200.
[0018]
The elastic seal 201 is made of a thin rubber having a thickness of about 0.5 to 0.6 mm, and has an outer diameter larger than the outer diameter of the lens holding surface of the lens holder 200 (about 22 mmφ) and an inner diameter larger than the hole diameter of the lens holder 200. A small (about 8 mm) shaped ring is used, with both sides coated with an adhesive.
[0019]
FIG. 3 is a block diagram showing the configuration of the lens meter 5. The lens meter 5 includes a light source 31 that illuminates the bifocal lens 100, a rotating screen 32 that is irradiated with illumination light from the light source 31, a motor 33 that rotates the rotating screen 32, an imaging lens 34, and a double lens. The lens holding device 35 that sucks and fixes the focal lens 100, the condensing lenses 36 and 37 that collect the illumination light reflected by the rotary screen 32 and irradiate the bifocal lens 100, and the bifocal lens 100. A mirror 38 that reflects the reflected light, an imaging device 39 such as a CCD camera that captures the reflected light from the mirror 38, and a focus correction lens 40 for correcting the focus of the imaging device 39.
[0020]
As the light source 31 used for photographing the bifocal lens 100, light having a narrow emission spectrum width, for example, red light LED, is used so that the small balls 104 can be photographed satisfactorily. For example, eight light sources 31 are arranged around the imaging lens 34 at equal intervals.
[0021]
The rotating screen 32 has a reflective sheet applied with a fine powder such as glass or aluminum on its surface in order to increase the reflectance. Further, in order to make the brightness of the surface uniform, the rotary screen 32 is rotated at a high speed (for example, 3400 rpm) by the motor 33. The illumination light reflected by the rotating screen 32 enters the concave surface side of the bifocal lens 100.
The cylindrical lens holding device 35 that holds the bifocal lens 100 has a sufficiently small outer diameter (for example, 8 mmφ) so as not to interfere with shooting of the small balls 104.
[0022]
4 and 5 are flowcharts showing the operation of the layout block device of FIG. Hereinafter, the operation of the layout block device will be described in detail with reference to FIGS. First, the lens supply device 3 controls the lens meter 5 so that one bifocal lens 100 (hereinafter, referred to as a processing target lens 100) to be edged is placed with its convex surface facing upward, under the control of the control device 8. Placed on the lens holding device 35. The lens holding device 35 sucks and fixes the processing target lens 100 to the upper surface opening of the lens support tube by evacuating the inside of the lens support tube (step S1 in FIG. 4).
[0023]
The holder supply device 1 supplies the lens holders 200 one by one to the holder holding device 4 under the control of the control device 8.
The elastic seal 201 is loaded in the seal supply device 2 in the form of a roll. This roll has a surface covered with protective paper. The seal supply device 2 supplies the elastic seal 201 to the holder holding device 4 in a state where the protective paper is peeled one by one under the control of the control device 8.
[0024]
Upon receiving the lens holder 200 and the elastic seal 201, the holder holding device 4 holds the lens holder 200, affixes the elastic seal 201 to the lens holding surface of the lens holder 200, and the lens holder 200 to the processing target lens 100. In preparation for mounting, the standby state is set (step S2).
[0025]
Next, the control device 8 turns on the light source 31 of the lens meter 5 (step S3). Subsequently, the image processing device 6 resets and starts the time-up timer for image processing to 0 in accordance with an instruction from the control device 8, and starts time measurement (step S4). This time-up timer is for measuring the elapsed time of image processing related to one processing target lens 100.
[0026]
Illumination light from the light source 31 is reflected by the rotary screen 32 and passes through the imaging lens 34 and the condenser lenses 36 and 37 and is irradiated to the concave surface side of the processing target lens 100. The image that has passed through the processing target lens 100 is reflected by the mirror 38, passes through the focus correction lens 40, and is projected onto the light receiving surface of the imaging device 39. The imaging device 39 photoelectrically converts the image projected on the light receiving surface and outputs an image signal. The focus correction lens 40 is a lens for making the focal point of the imaging device 39 coincide with the convex surface of the processing target lens 100.
[0027]
The processing target lens 100 used in the present embodiment is a bifocal lens called a one-piece type made of plastic, for example. In the bifocal lens called a one-piece type, as shown in FIG. 7B, the small balls 104 are formed so as to protrude in a wedge shape on the convex surface side of the lens, and there is a step at the boundary between the pedestal 103 and the small balls 104. Exists.
[0028]
If an attempt is made to detect the center position of the upper edge 108 or the rotation angle of the small ball 104 by image processing based on the overall contour of the small ball 104, the processing is complicated because there is no acute vertex in the small ball 104, and the detection accuracy is uncertain. It becomes. Therefore, in the present embodiment, the processing target lens 100 is irradiated with illumination light from one surface side (concave surface in the present embodiment), and the imaging device 39 is disposed on the other surface side (convex surface side). It is arranged so that an image of only the upper edge 108 of the small ball 104 is projected on the light receiving surface of the imaging device 39. In this way, only the upper edge 108 having the largest step among the entire contour of the small ball 104 can be clearly photographed, and the center position of the upper edge 108 and the rotation angle of the small ball 104 can be easily detected by image processing. It becomes.
[0029]
The image processing apparatus 6 includes a memory that stores image data and an arithmetic processing unit that performs various arithmetic processes on the image data according to a program. The image processing device 6 performs A / D conversion on the image signal output from the imaging device 39 of the lens meter 5, and temporarily stores the image data after the A / D conversion in an internal memory (step S5).
Subsequently, the image processing device 6 starts image processing on the input image stored in the memory. FIG. 6 is an explanatory diagram for explaining a state of image processing by the image processing device 6.
[0030]
First, the image processing device 6 compares the input image as shown in FIG. 6A with a predetermined first threshold value, and directly determines pixels having a luminance value equal to or higher than the first threshold value from the input image. At the same time, by performing static threshold processing for setting the luminance value to 0 for pixels whose luminance value is less than the first threshold, the background area is removed from the input image, and the lens area is extracted. The lens area image is stored in the memory (step S6).
[0031]
Subsequently, the image processing device 6 calculates, for each pixel, the difference between the image after smoothing the static threshold processing image stored in the memory and blurring the image and the image after the static threshold processing. Thus, a value of “1” is set for a pixel whose calculated difference is equal to or greater than a predetermined second threshold value, and a value of “0” is set for a pixel whose difference is less than the second threshold value. By performing threshold processing, the image after the static threshold processing is binarized (step S7).
[0032]
In this dynamic threshold processing, the contour is sharpened by difference processing, where the difference output is large, that is, the portion that seems to be the contour of the object is set to “1”, and other portions are set to “0”. Even if there is slight illumination unevenness or halation when the processing target lens 100 is photographed, the shape of the upper edge (hereinafter referred to as segment top) 108 of the small ball 104 can be extracted. By this dynamic threshold processing, an image as shown in FIG. 6B is obtained. The image processing device 6 stores the image after the dynamic threshold processing in the memory.
[0033]
In many cases, the binarized image includes dust, dirt, or the like on the surface of the processing target lens 100. Therefore, since the segment top cannot be detected with the binarized image obtained by the dynamic threshold processing, the noise top is removed as follows to detect the segment top.
[0034]
The image processing apparatus 6 regards a group of pixels “1” connected in the binarized image after the dynamic threshold processing as one connected component, and each pixel in the same connected component has the same label (number). Or, after performing a labeling process that gives a name), geometric feature parameters of each connected component are extracted and stored in a memory. Here, the area (number of connected component pixels) S, the major axis L1, and the minor axis L2 shown in FIG. 6C are extracted as characteristic parameters of each connected component. In FIG. 6C and subsequent figures, the area of the pixel “1” is indicated by hatching.
[0035]
Then, the image processing apparatus 6 is within the first area range in which the area S is preset, the major axis L1 is in the preset major axis range, and the minor axis L2 is in the preset minor axis range. The connected component is extracted as an area similar to the segment top (hereinafter referred to as segment top area ST), and the position of the extracted segment top area ST is stored in the memory (step S8). Thus, for example, a segment top region ST as shown in FIG. 6D can be extracted.
[0036]
The extracted segment top region ST includes a protruding noise component. Therefore, the image processing apparatus 6 once contracts the extracted segment top region ST by a predetermined number of pixels, and then expands the segment top region ST by the same number of pixels and restores the original. When the segment top region ST is contracted, the protruding noise component disappears. Therefore, if the segment top region ST after the contracting process is expanded and returned to the original state, the protruding noise component is removed from the segment top region ST. The shape can be corrected by removing (step S9).
[0037]
Subsequently, the image processing apparatus 6 obtains the minimum rectangle R including the segment top area ST as shown in FIG. 6E (step S10), counts the number of segment top areas ST, and stores it in the memory (step S10). S11).
Next, the image processing apparatus 6 determines whether or not the number of segment top areas counted in step S11 is 1 (step S12). If the number of segment top areas is not 1, the elapsed time being measured by the time-up timer is determined. It is determined whether or not a predetermined second (for example, 4 seconds) has been exceeded (step S13).
[0038]
When the elapsed time does not exceed the predetermined second, the image processing device 6 executes the processes of steps S5 to S12 again. Thus, when the number of segment top areas is not 1 (that is, when a region other than the segment top is detected) and the elapsed time does not exceed the predetermined seconds, the processes of steps S5 to S12 are repeatedly executed. .
[0039]
When the elapsed time exceeds the predetermined time in step S13, the image processing device 6 determines that the segment top cannot be detected by the image processing, and notifies the control device 8 that the image processing is impossible. Perform error handling for image processing. Upon receiving the notification, the control device 8 performs processing such as discharging the processing target lens 100 in which the image processing incapable error has occurred from the layout / block device.
[0040]
On the other hand, when the number of segment top areas is 1 in step S12, the image processing apparatus 6 determines the coordinates of the center C of the rectangle R, the segment top area ST, and the long side of the rectangle R as shown in FIG. The coordinates of the contact point P (reference position) are calculated, the axis A in the long side direction of the rectangle R is obtained, and the angle formed by this axis A and the horizontal reference line 102 of the layout block device (the processing target for the horizontal reference line 102) The rotation angle θ of the lens 100 is calculated, and the coordinates of the center C and the contact P and the rotation angle θ are stored in the memory (step S14).
[0041]
In the processing target lens 100, an angular deviation occurs at the time of supply with respect to the original position on the layout block device. The calculation of the rotation angle θ is a process for obtaining this angular deviation.
Further, the image processing device 6 calculates the coordinates of the center of gravity D of the segment top region ST and stores it in the memory (step S15).
[0042]
Next, the image processing apparatus 6 determines whether or not the coordinates of the center C, the contact point P, and the center of gravity D and the rotation angle θ have been acquired five times (step S16). Returning to S4, the time-up timer is reset to 0 and the above-described processing is performed again. Thereby, the process of step S4-S15 is repeated until each coordinate and rotation angle (theta) are acquired 5 times.
[0043]
After acquiring the coordinates of the center C, the contact P, and the center of gravity D and the rotation angle θ for five times, the image processing apparatus 6 calculates the minimum value and the maximum value from the coordinate values for the center C stored in the memory for five times. The average of the remaining three coordinate values is determined, and this average value is used as the final coordinate value of the center C. Similarly, the image processing device 6 obtains an average value for each of the coordinates of the contact P and the center of gravity D and the rotation angle θ (step S17 in FIG. 5). In this way, the data is stabilized by obtaining the average value after excluding the minimum value and the maximum value of each data.
[0044]
After the averaging process, the image processing apparatus 6 determines whether the center of gravity D is above the center C (step S18). When the processing target lens 100 is supplied to the layout / blocking device in an upside-down state, the center of gravity D is below the center C. When the center of gravity D is below the center C, the image processing device 6 performs upside down error processing for notifying the control device 8 that the processing target lens 100 is upside down and out of the allowable range of the layout block device. Do. Upon receiving the notification, the control device 8 performs processing such as discharging the processing target lens 100 in which the upside-down error has occurred from the layout block device.
[0045]
When the center of gravity D is above the center C, the image processing device 6 determines whether or not the rotation angle θ is within a preset range (for example, ± 60 °) (step S19). If the rotation angle θ is not within the preset range, the image processing device 6 notifies the control device 8 that the rotation angle of the lens 100 to be processed is outside the allowable range of the layout / block device. I do. Upon receiving the notification, the control device 8 performs processing such as discharging the processing target lens 100 in which the angle over error has occurred from the layout / block device.
[0046]
When the rotation angle θ is within a preset range, the image processing device 6 rotates the binarized image by the rotation angle θ with the center of the binarized image after the dynamic threshold processing as the rotation center. Thus, the segment top region ST is made parallel to the horizontal reference line 102 (step S20). The reason why the binarized image is rotated is to enable the right / left determination of the processing target lens 100 to be correctly performed in the next left / right determination process.
[0047]
Next, the image processing apparatus 6 determines whether the processing target lens 100 is a right-eye lens or a left-eye lens (step S21). In the case of the bifocal lens 100, the small balls 104 are arranged so as to be biased toward the ear with respect to the geometric center 101. Therefore, if the segment top region ST is on the right side with respect to the center of the binary image, the lens is for the right eye. If the segment top region ST is on the left side, the lens is for the left eye.
[0048]
Further, when determining whether the segment top region ST is biased to the left or right with respect to the center of the binary image, the center of the binary image needs to substantially match the position of the geometric center 101 of the processing target lens 100. There is. This alignment is performed by the centering mechanism of the lens supply device 3. That is, the lens supply device 3 performs centering of the processing target lens 100 when the processing target lens 100 is conveyed to the lens holding device 35 of the lens meter 5, and the geometric center 101 of the processing target lens 100 is about ± 1 mm. Is placed so as to come to the center of the lens support tube of the lens holding device 35.
[0049]
Next, the image processing device 6 transmits the result of the left / right determination of the processing target lens 100 and the calculated coordinates of the center C, the contact P, and the center of gravity D and the rotation angle θ to the control device 8, and the control device 8 The result of the right / left determination of the processing target lens 100 and the rotation angle θ are transmitted to the host computer 9 (step S22). Further, the control device 8 turns off the light source 31 of the lens meter 5 (step S23).
[0050]
The host computer 9 pre-reads the barcode attached to the tray of the lens 100 to be processed at the time of supply to the layout block device with a barcode reader. Information indicating whether the processing target lens 100 is a right-eye lens or a left-eye lens is written in the barcode. Therefore, the host computer 9 collates the result read in advance from the barcode with the result of the left / right determination sent from the control device 8, so that the content represented by the barcode and the actual lens to be processed placed on the tray It can be checked whether 100 matches.
[0051]
Then, the host computer 9 corrects the angle of the layout data (data representing the mutual positional relationship between the reference position, the geometric center 101, and the eye point 107) stored in advance in accordance with the rotation angle θ. Above, block data (data representing the relative position of the eye point 107 with respect to the reference position) is calculated based on the layout data after the angle correction, and transmitted to the control device 8 (step S46).
[0052]
In the processing target lens 100, the reference position is the center of the upper edge 108 of the small ball 104. Therefore, the contact P detected by the image processing apparatus 6 is the reference position of the processing target lens 100, and the contact P at this time is the horizontal direction (left-right method in FIG. 6) and the vertical direction (up-down direction in FIG. 6) at the time of supply. Due to the misalignment, the position of the layout block device deviates from the original position. That is, the processing target lens 100 is displaced in the horizontal direction and the vertical direction. On the other hand, the block data is calculated on the assumption that the angular deviation of the processing target lens 100 is corrected as described above, but the positional deviation in the horizontal direction and the vertical direction has no positional deviation.
[0053]
Therefore, when the control device 8 causes the lens supply device 3 to transport the processing target lens 100 from the lens meter 5 to a predetermined lens holding position, the control device 8 detects the horizontal and vertical misalignment of the processing target lens 100 in the contact P. The lens is supplied based on the block data from the host computer 9 so that the eye point 107 of the processing target lens 100 is directly below the lens holder 200 held by the holder holding device 4. The apparatus 3 is controlled (step S24).
[0054]
Subsequently, the control device 8 controls the holder holding device 4 and corrects the angle by rotating the lens holder 200 by the rotation angle θ in order to correct the angle shift at the time of supplying the processing target lens 100 (step). S25). Then, the control device 8 controls the holder holding device 4 to lower the lens holder 200 and press the elastic seal 201 attached to the lens holder 200 against the processing target lens 100 so as to be in close contact therewith. Thereby, as shown in FIG. 2, the lens holder 200 is attached to the processing center (eye point 107) of the processing target lens 100 via the elastic seal 201 (step S26).
[0055]
The control device 8 controls the holder holding device 4 to convey the lens holder 200 together with the processing target lens 100 to a predetermined extraction position (step S27), and then controls the lens conveyance device 7 to extract the extraction position. The processing target lens 100 is conveyed to the edging apparatus (step S28).
Thus, the process of the layout block device for one processing target lens 100 is completed.
[0056]
The lens to be processed 100 sent to the edging device is subjected to edging processing such as beveling based on the lens frame shape data and the wearer's prescription data by the edging processing device. A matching spectacle lens is produced.
[0057]
【The invention's effect】
According to the present invention, an image of a spectacle lens to be processed is captured and binarized, and a geometric feature parameter of each figure included in the binarized image is extracted. Is extracted as an image of the upper edge of a small ball previously formed on the spectacle lens, and a reference position having a predetermined positional relationship with the processing center position is extracted on the binary image based on the extracted position of the upper edge of the small ball. When the operator manually aligns the spectacle lens reference image displayed on the eyeglass lens figure displayed on the remark chart or the screen of the TV monitor and the actual eyeglass lens as in the past. Compared to the above, highly accurate alignment can be realized, and the burden on the operator can be remarkably reduced. As a result, high-precision alignment between the spectacle lens and the lens holder can be performed efficiently and in a short time.
[0058]
In addition, by illuminating the spectacle lens with a step at the boundary between the ball and the ball from one surface side and taking an image of the spectacle lens from the other surface side, Only the image of the upper edge can be obtained, and it becomes easy to obtain the reference position and angular deviation of the spectacle lens.
[0059]
In addition, a minimum rectangle including the upper edge of the small ball is obtained on the binary image, and an angle deviation with respect to the normal position of the spectacle lens is obtained based on the position of the rectangle. The processing center position can be obtained, and the processing can be stopped for a spectacle lens having a significant angular deviation.
[0060]
Further, the binary image is rotated according to the angle shift so that the upper edge of the small ball is horizontal, and the spectacle lens is used for the right eye and the left eye based on the position of the upper edge of the small ball in the binary image after the rotation process. By determining which lens is for use, the right and left determination of the spectacle lens can be performed correctly, and it can be checked whether a spectacle lens different from the desired lens has been sent by mistake, If it is determined that the spectacle lens is sent in error, the processing of the spectacle lens can be stopped.
[0061]
In addition, the upper and lower sides of the spectacle lens are determined by determining the top and bottom of the spectacle lens based on the center position of the rectangle and the center of gravity of the top edge of the small ball. Processing of the spectacle lens supplied in the reverse state can be stopped.
[0062]
In addition, the layout data representing the positional relationship between the reference position and the processing center position is stored in a calculation unit different from the image processing unit, and the processing unit calculates the processing center position of the spectacle lens. Therefore, it becomes easy to register layout data according to the spectacle lens to be processed.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a bifocal lens layout block device according to an embodiment of the present invention;
FIG. 2 is a side view showing a state in which a lens holder is attached to a bifocal lens through an elastic seal.
3 is a block diagram showing a configuration of a lens meter of the layout block device of FIG. 1. FIG.
4 is a flowchart showing the operation of the layout block device of FIG. 1. FIG.
FIG. 5 is a flowchart showing the operation of the layout block device of FIG. 1;
6 is an explanatory diagram showing a state of image processing by the image processing device of the layout block device of FIG. 1; FIG.
FIGS. 7A and 7B are a plan view and a side view showing a positional relationship between a small lens of a bifocal lens, a geometric center, and the like.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Holder supply apparatus, 2 ... Seal supply apparatus, 3 ... Lens supply apparatus, 4 ... Holder holding apparatus, 5 ... Lens meter, 6 ... Image processing apparatus, 7 ... Lens conveyance apparatus, 8 ... Control apparatus, 9 ... Host computer , 31 ... light source, 39 ... imaging device, 100 ... bifocal lens, 101 ... geometric center, 102 ... horizontal reference line, 103 ... pedestal, 104 ... small ball, 107 ... eye point.

Claims (7)

A method for aligning a spectacle lens having a procedure for obtaining a processing center position for attaching a processing jig on a spectacle lens to be processed and attaching the processing jig to the processing center position,
A procedure of taking an image of a spectacle lens to be processed and binarizing;
An image of an upper edge of a small ball in which a geometric feature parameter of each figure included in the binarized image is extracted and a figure that satisfies the predetermined condition is formed on the eyeglass lens to be processed. And the procedure to extract as
A procedure for obtaining the center position of the upper edge of the extracted small ball on the binary image as a reference position of the eyeglass lens to be processed ;
A procedure for obtaining a minimum rectangle including the upper edge of the small ball on the binary image, and obtaining an angular deviation of the eyeglass lens to be processed with respect to a horizontal reference line based on the position of the rectangle;
Of the layout data representing the positional relationship between the reference position and the processing center position prepared in advance for each spectacle lens, the layout data corresponding to the spectacle lens to be processed is angle-corrected according to the angular deviation, and the angle A method for aligning a spectacle lens, comprising: a step of obtaining a processing center position of the spectacle lens to be processed based on layout data after correction and a reference position of the spectacle lens to be processed . The method for aligning eyeglass lenses according to claim 1.
By irradiating illumination light from one surface side to the spectacle lens having a step at the boundary between the ball and the small ball, and taking an image of the spectacle lens from the other surface side, A method for aligning eyeglass lenses, wherein an image of only the upper edge is obtained. The method for aligning eyeglass lenses according to claim 1.
The binary image is rotated according to the angular deviation so that the upper edge of the small ball is horizontal, and the spectacle lens is used for the right eye based on the position of the upper edge of the small ball in the binary image after the rotation process. A method for aligning a spectacle lens, comprising determining which lens is for the left eye . The method for aligning eyeglass lenses according to claim 1 .
The smallest rectangle including the upper edge of the small ball is obtained on the binary image, and the upper and lower sides of the spectacle lens are determined based on the center position of the rectangle and the center of gravity of the upper edge of the small ball. A method for aligning eyeglass lenses. The method for aligning eyeglass lenses according to claim 1 .
The eyeglass lens further comprising a procedure of discharging the eyeglass lens to be processed from a layout block device when an elapsed time of image processing relating to the eyeglass lens to be processed exceeds a predetermined time . Alignment method. An imaging means for taking an image of the eyeglass lens to be processed, an image processing means for processing the image, an arithmetic means for obtaining a processing center position of the eyeglass lens, and a mechanism for attaching a processing jig to the processing center position An eyeglass lens layout block device comprising:
The image processing means binarizes the image photographed by the photographing means, extracts a geometric feature parameter of each figure included in the binarized image, and the feature parameter is set to a predetermined condition. A figure that fits is extracted as an image of an upper edge of a small ball previously formed on the spectacle lens, and a center position of the extracted upper edge of the small ball is obtained as a reference position of the eyeglass lens to be processed on the binary image, A minimum rectangle including the upper edge of the small ball is obtained on the binary image, and based on the position of the rectangle, an angular deviation of the eyeglass lens to be processed with respect to a horizontal reference line is obtained,
The calculation means stores in advance layout data representing a positional relationship between a reference position and a processing center position for each spectacle lens, and corrects the layout data corresponding to the spectacle lens to be processed according to the angular deviation. An eyeglass lens layout block device for obtaining a processing center position of the eyeglass lens to be processed based on layout data after angle correction and a reference position of the eyeglass lens to be processed . In the spectacle lens layout block device according to claim 6 ,
Furthermore, it has a control means for discharging the eyeglass lens to be processed when an error occurs,
The image processing means notifies the control means of an image processing impossible error when an elapsed time of image processing relating to the eyeglass lens to be processed exceeds a predetermined time,
The eyeglass lens layout / blocking device, wherein the control means discharges the eyeglass lens to be processed from the layout / blocking device when receiving a notification of the image processing impossible error .

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