JP2005091025A - Lens fastener and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens fastener and its method for minimizing the effect of refraction due to a lens 2, thereby performing accuracy enhancement and work simplification on blocking, and further for obtaining a sufficiently contrasty contour shape, thereby performing accuracy enhancement and work simplification in layout determination. <P>SOLUTION: In brief, this lens fastener is equipped with a lens holding part 1, a first lighting part 3 for irradiating parallel light to a lens 2, a first imaging part 6 for imaging an image projected onto a screen 5, a second lighting part 7 for irradiating ultraviolet light, a second imaging part 9 for imaging an image of the lens 2, a peripheral shape extraction part 64 for extracting a peripheral shape image of the lens 2, a lens prescription information acquisition part 61 for acquiring lens prescription information on the lens 2, an index mask means for expressing positional relation between the lens 2 and a working tool 14, a display part 12 for displaying each piece of information, and a working tool attachment part 10 for attaching the working tool 14 to the lens 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fixing device and method for fixing a processing jig used when processing a lens into a predetermined frame shape to the lens.

  Conventionally, when a spectacle lens is framed in a predetermined frame, so-called target lens processing is performed in which a peripheral portion of the spectacle lens is processed by grinding or the like in accordance with the shape of the spectacle frame.

  Before processing the target lens in a target lens processing machine, it is necessary to fix a processing jig called a cup to the spectacle lens, and the spectacle lens and the processing jig are fixed by an operation called blocking.

  The work content of blocking differs depending on the type of optical design of the spectacle lens. For example, in the case of a single focus lens, an optical center and an astigmatic axis direction are determined in accordance with a customer's lens prescription by a measuring device called an optical characteristic called a lens meter, and mark points are provided on the spectacle lens as marks. After that, the eyeglass lens and the processing jig are aligned with each other with a device called a pivoting device based on the mark point, and fixed to the fixing jig.

  In addition, in the case of progressive multifocal lenses, the alignment device is used as a reference for layout printing that is pre-printed at the time of shipment from an eyeglass lens manufacturer (corresponding to an alignment mark as a reference for processing). Positioning is performed so that the tool is in a predetermined positional relationship, and the tool is fixed to the fixing jig.

  A pivoting method and a pivoting device used for blocking are disclosed in Patent Document 1.

  The pivoting device disclosed in Patent Document 1 is characterized in that the marking work required prior to blocking of the single focus lens can be omitted, and the progressive multifocal lens can be blocked by the same pivoting device by changing the setting. In addition, illumination is arranged on the processing jig fixing surface side, and a screen for projecting layout printing is arranged on the side opposite to the processing jig fixing surface. A scale corresponding to a reference for alignment is electronically provided on an image captured from the CCD camera, and alignment is performed while observing the image captured via the CCD camera on a display device. ing. In addition, it is possible to irradiate the spectacle lens with parallel light having a larger area than the blocking spectacle lens, project the shape of the spectacle lens on the screen, and display it on the display device via the CCD camera. Further, since the shape of the spectacle frame can also be displayed, so-called layout determination can be performed on the display device to determine whether the spectacle lens to be blocked has a sufficient size with respect to the spectacle frame.

JP-A-11-216650

  The pivoting device shown in Patent Document 1 has a device for omitting the marking operation, and the complexity of the marking operation is eliminated. However, with regard to the alignment of the progressive multifocal lens, the layout print projected on the screen is imaged with a CCD camera, the electronic graduation is overlaid on the captured image, and the layout print is performed for alignment with the image as a reference. Is already affected by the refraction of the spectacle lens at the stage of projection onto the screen. Accordingly, an error as position information is included in the projected image itself, and an alignment error occurs.

  In addition, the layout determination for determining whether the spectacle lens to be blocked has a sufficient size with respect to the spectacle frame can be compared with the peripheral shape of the lens and the frame shape. Therefore, the shape of the periphery of the lens displayed on the display device is difficult to visually recognize due to insufficient contrast.

  The present invention has been made in view of the above-mentioned circumstances, and by suppressing the influence of refraction by the lens as much as possible, it is possible to improve the accuracy of blocking and simplify the work, and to provide a contour shape having sufficient contrast. It is an object of the present invention to provide a lens fixing device and method capable of improving layout determination accuracy and simplifying operations.

  In order to achieve the above object, in the lens fixing device of the present invention, a processing jig used when processing the lens into a predetermined frame shape is a fixing device that fixes the lens to the lens, and the lens holding unit holds the lens. A first illuminating unit that irradiates the lens with parallel light, a screen that projects an image of the lens irradiated by the first illuminating unit, and a first imaging unit that captures an image projected on the screen A second illuminating unit that irradiates at least a peripheral portion of the lens with ultraviolet light, a second imaging unit that captures an image of the lens irradiated by the second illuminating unit, and an image captured by the second imaging unit. A peripheral shape extraction unit that extracts a peripheral shape image of the lens from the captured image, a lens prescription information acquisition unit that acquires lens prescription information of the lens, and a position of the lens and the processing jig Index mask means for displaying information, a display unit for displaying an alignment information image by the index mask means, the peripheral shape image, and the lens prescription information, and a processing jig attachment for attaching a processing jig to the lens It is a summary to provide a part. Accordingly, it is possible to improve the accuracy of blocking and simplify the operation by suppressing the influence of refraction by the lens as much as possible. In addition, a lens fixing device is provided that improves the accuracy of layout determination and simplifies the work by irradiating the lens with ultraviolet light and directly capturing an image with a camera to obtain a contour shape having sufficient contrast. be able to.

  In the lens fixing device of the present invention, the first illumination unit and the second illumination unit are arranged to face each other with the lens held by the lens holding unit between the first illumination unit and the first illumination unit. Transmits light projected from the first illumination unit and projected on the screen to the screen, and irradiated from the second illumination unit between the first imaging unit and the first imaging unit. The gist of the invention is that a half mirror is disposed to reflect the ultraviolet light to the second imaging unit. Thereby, there is no switching of the apparatus at the time of blocking and layout determination, and further, each work can be performed without turning off the second illumination unit at the time of blocking, and without turning off the first illumination unit at the time of layout determination. That is, it is possible to provide a lens fixing device that can simplify the operation by simultaneously performing blocking and layout determination.

  In the lens fixing device of the present invention, a shape determination unit that determines whether or not the frame shape is within the range of the peripheral shape of the lens, and the frame shape within the range of the peripheral shape of the lens The above-mentioned display unit that displays a warning when the content does not fit. Accordingly, it is possible to provide a lens fixing device capable of suppressing a determination error by an operator by automatically determining the layout.

  In the lens fixing device of the present invention, the index mask means includes an index mask plate provided with a predetermined pattern used for positioning the lens between the first illumination unit and the lens. Is the gist. As a result, since the projected image itself has position information, there is no possibility of an alignment error, so that it is possible to provide a lens fixing device that can improve the accuracy of blocking and simplify the work. .

  The lens fixing method of the present invention is a fixing method for fixing a processing jig used when processing the lens into a predetermined frame shape to the lens, the step of holding the lens, and the parallel light to the lens. To obtain an image projected on the screen by irradiating the lens, and to obtain an image of the lens by irradiating at least the vicinity of the periphery of the lens with ultraviolet light to capture the second image. Obtaining a frame image from lens prescription information of the lens, obtaining a third image, extracting a peripheral shape image of the lens from the second image, and obtaining a fourth image; The step of displaying the first image including the alignment information between the lens and the processing jig and the third and fourth images on the display unit, and the image displayed on the display unit After alignment, the front And summarized in that comprises a step of mounting a processing jig to the lens. Accordingly, it is possible to improve the accuracy of blocking and simplify the operation by suppressing the influence of refraction by the lens as much as possible. In addition, by fixing the lens with ultraviolet light and capturing images directly with the camera, it is possible to obtain a contour shape with sufficient contrast, thereby improving the accuracy of layout determination and simplifying the work. A method can be provided.

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The work content of blocking differs depending on the type of optical design of the lens. In the present embodiment, description will be given taking blocking of a progressive multifocal lens and a single focus lens as an example.

  FIG. 1 is a schematic side view showing a lens fixing device according to the present embodiment. As shown in the figure, the fixing device has a structure in which the lens 2 can be held by the lens holding portion 1. A first illumination unit 3 is disposed above the lens holding unit 1 and irradiates parallel light on the objective surface of the lens 2. Between the lens holding unit 1 and the first illuminating unit 3, an index mask plate 4 as an index mask unit is disposed and used for positioning the lens 2. A screen 5 is disposed below the lens holding unit 1, and irradiation light from the first illumination unit 3 is projected thereon. Below the screen 5, a first imaging unit 6 is arranged to capture an image projected on the screen 5 from the back side of the screen 5. Near the lower part of the lens 2, a second illumination unit 7 is disposed, and irradiates parallel ultraviolet rays so as to illuminate the outer periphery and the peripheral part of the eyeball side surface of the lens 2. A half mirror 8 is disposed between the lens holding unit 1 and the indicator mask plate 4 to reflect the irradiation light from the second illumination unit 7. On the irradiation light reflected by the half mirror 8, a second imaging unit 9 is disposed and images the lens 2. A processing jig mounting portion 10 is inserted between the lens holding portion 1 and the half mirror 8. The computer 11 is connected to the first imaging unit 6, the second imaging unit 9, and the display unit 12, and performs predetermined image processing on the images captured from the first imaging unit 6 and the second imaging unit 9, and the result is obtained. It is displayed on the display unit 12 as alignment information. Although not shown in FIG. 1, the screen 5 has a movable structure that can change the distance from the lens 2. The movable type is moved manually or automatically according to the type of lens (progressive multifocal or single focus) or lens prescription. When aligning the progressive multifocal lens, the screen 5 is preferably close to the lens 2 because distortion of the projected image is suppressed. However, when aligning a single-focal lens with a particularly low refractive power, It is better to keep away from the lens 2 in order to reliably detect the astigmatic axis direction.

  FIG. 2 is a plan view showing the lens holding portion 1 of the fixing device. As shown in the figure, in the lens holding portion 1, three resin terminals 22 are arranged at approximately the same distance from the geometric center of the base R plate 21 of the transparent member, and these terminals 22 are the eyeballs of the lens 2. It is designed to contact and hold the side surface.

  FIG. 3 shows an example of layout printing and hidden marks attached to the lens. As shown in the figure, when the lens 2 is a progressive multifocal lens, a layout print 31 is attached. The layout printing 31 is used as a processing reference when performing the target lens processing, and is generally printed at the stage of shipment from a lens manufacturer. Also, the hidden mark 32 shown in FIG. 3 is transferred from the mold when the lens 2 is molded, and is formed with minute irregularities. Similar to the layout printing 31, the hidden mark 32 is an alignment mark serving as a processing reference, and is arranged at an equal distance from the optical center of the lens 2, for example, at a position of 17 mm. The layout print 31 is printed based on the hidden mark 32.

  As long as the 1st illumination part 3 can irradiate a parallel light, what kind of thing may be sufficient, but LED, a laser, a halogen lamp etc. can be illustrated as the light source 13. FIG.

  FIG. 4 shows an example of the indicator plate and the mask plate. The details of the index mask plate 4 are as follows. As shown in the figure (a) in which the index plate and the mask plate are formed on a single base plate, a window portion 42 for transmitting light to the opaque base S plate 41 and a single focal point. A circular window 43 used for lens alignment is provided. A reticle 44 used for alignment of the progressive multifocal lens is attached to the window 42 and the circular window 43. Three reticles 44 are provided, and are arranged at the center of the index mask plate 4 and at the same distance from the center, for example, 17 mm.

  Irradiated light that has been irradiated from the first illumination unit 3 and transmitted through the index mask plate 4, the lens 2, and the lens holding unit 1 is projected onto the screen 5. As the screen 5, frosted glass or the like may be used, and any material can be used as long as the layout mask 31 and the hidden mark 32 on the index mask plate 4 and the lens 2 can be projected and the projected image can be taken from the back side.

  The 2nd illumination part 7 illuminates the outer periphery of the lens 2, and its peripheral part with the light (ultraviolet light) which has a wavelength of an ultraviolet region. For example, black light having an emission peak in the near ultraviolet region near 350 nm can be mentioned. In addition, UV lamps or UV lasers that emit light having a wavelength in the ultraviolet region described above can be used. The lens 2 has a property of absorbing a specific wavelength band (ultraviolet light), and on the other hand, an imaging device such as a CCD has a predetermined light receiving sensitivity with respect to the wavelength band absorbed by the lens. . That is, when the lens 2 is irradiated with light of such a wavelength band and the entire image of the lens is captured by, for example, a CCD camera on the side opposite to the irradiation side, an image in which the lens part is dark and the other part is bright can be obtained. it can.

  The half mirror 8 reflects the irradiation light from the first illumination unit 3 and reflects the irradiation light from the second illumination unit 7 toward the second imaging unit 9 so as to be imaged by the second imaging unit 9. . The material of the half mirror 8 is not limited as long as the irradiation light of the second illumination unit 7 can be imaged by the second imaging unit 9.

  The second imaging unit 9 is adjusted so that the lens 2 is in focus via the half mirror 8.

  The processing jig mounting portion 10 is provided with a chuck 15 that can hold the processing jig 14. The chuck 15 and the chuck 15 are moved from the point A to the point B around the point O by the rotational movement and from the point B to the point C by the vertical movement. The processing jig 14 is moved to fix the processing jig 14 to the lens 2. The processing jig mounting portion 10 is provided on the processing jig 14 so that the center of the processing jig 14 substantially coincides with the center of the index mask plate 4 and the first imaging unit 6 at points B and C. The notch 16 (which defines an angle in the circumferential direction of the lens 2 when set in the processing machine) and a predetermined angle are adjusted.

  An imaging method and an image of the first imaging unit 6 and the second imaging unit 9 when the lens 2 is a progressive multifocal lens will be described.

  Irradiation light emitted from the first illumination unit 3 is transmitted through the index mask plate 4 through the lens 2 and the lens holding unit 1 and projected onto the screen 5. The first imaging unit 6 captures an image projected on the screen 5 from the back side.

  FIG. 5 is a diagram illustrating a state in which the progressive multifocal lens is aligned by the fixing device, and is a schematic diagram of an image captured by the first imaging unit 6. FIG. 4A shows a state immediately after the lens is placed. In the schematic diagram of FIG. 5, the image is inverted so that the lens 2 is viewed in the same manner as seen from above in FIG. 1. Further, the irradiation light emitted from the second illumination unit 7 passes through the lens 2, is reflected by the half mirror 8, and is imaged by the second imaging unit 9. A schematic diagram of an image captured by the second imaging unit 9 is shown in FIG. 7 as an example of a screen state for layout determination.

  Next, an imaging method and an image of the first imaging unit 6 and the second imaging unit 9 when the lens 2 is a single focus lens will be described.

  Irradiation light emitted from the first illumination unit 3 is transmitted through the index mask plate 4 through the lens 2 and the lens holding unit 1 and projected onto the screen 5. The first imaging unit 6 captures an image projected on the screen 5 from the back side. FIG. 6 is a diagram illustrating a state in which the single focus lens is aligned by the fixing device, and is a schematic diagram of an image captured by the first imaging unit 6. FIG. 2A shows a state immediately after the lens is placed. A state is shown in which how much the lens 2 should be moved on the plane (XY) and how many times θ (angle) should be rotated are displayed. Further, only necessary information is extracted from the image captured by the first imaging unit 6. The portions corresponding to the reticle 44 and the window 42 are subjected to image processing and removed from the image.

  The light transmitted through the circular window 43 of the index mask plate 4 is focused by being affected by the position (XY-θ) and refraction (spherical refractive power, cylindrical refractive power, astigmatic axis, etc.) of the lens 2. The optical center position of the lens 2 (the position used as a reference for blocking) and the astigmatism axis direction are described later by an optical center detection unit that utilizes the phenomenon that the position of the lens changes and the phenomenon that transmitted light is distorted from a circular shape. Detected. For example, taking an astigmatic lens having a condensing function (without prism prescription) as an example, the center of gravity GC of the distorted elliptical projection image 45 as shown in FIG. It is a position where the emitted light converges, that is, it corresponds to the optical center. The optical center is a reference when the customer's lens 2 is put in the frame, and the processing jig 14 is blocked based on this point. Depending on the processing machine, the processing jig 14 may be fixed to the lens 2 on the basis of the center of the frame (boxing center) instead of the optical center reference. In order to define the position of the boxing center on the basis of the optical center, It is necessary to find the optical center. Further, the irradiation light emitted from the second illumination unit 7 passes through the lens 2, is reflected by the half mirror 8, and is imaged by the second imaging unit 9. A schematic diagram of an image captured by the second imaging unit 9 is shown in FIG.

  In FIG. 7, EP (Eye-Point) is a design optical center, and shows a state where the center of the screen (reference position for alignment) and the optical center of the lens 46 are aligned. (A) is the size of the lens, and (b) is the size of the lens is not enough.

  FIG. 8 shows a functional block diagram of the computer. As shown in the figure, the computer 11 includes a CPU (Central Processing Unit) 51 that performs overall control. In addition, a display unit 12, a storage unit 52, a first input unit 53, a second input unit 54, a third input unit 55, and an input / output unit 56 are provided, each of which is a CPU (central processing unit) 51. It is connected to the.

  The display unit 12 includes, for example, a CRT (Cathode-Ray Tube), a liquid crystal display, and the like, and displays an operation screen, a data input screen, and the like, for example. In addition to this, the display unit 12 displays the image of the lens 2 imaged by the first imaging unit 6 and the second imaging unit 9, the display of the processing status in the middle of the image processing, and finally recognition. The shape image of the lens 2 can be displayed.

  The storage unit 52 includes a storage medium (recording medium) such as a RAM, a ROM, and a magnetic disk that can be read by a CPU (central processing unit) 51. The storage medium is a magnetic or optical recording medium, Alternatively, it is composed of a semiconductor memory or the like.

  A keyboard for inputting characters and numbers is connected to the first input unit 53. The first imaging unit 6 is connected to the second input unit 54. The second imaging unit 9 is connected to the third input unit 55. Further, the input / output unit 56 is connected to a host computer via a network. Although not shown, the first input unit 53 can be connected to a mouse or the like that performs various operations with a cursor displayed on the screen of the display unit 12.

  FIG. 9 is a block diagram showing the internal structure of the storage unit of the computer 11. As shown in the figure, the computer 11 includes an image storage unit 60, a lens prescription information acquisition unit 61, a target lens shape image generation unit 62, a target lens shape recognition unit 63, a peripheral shape extraction unit 64, and a shape determination. A unit 65, an optical center detection unit 66, and an image composition processing unit 67.

  The image storage unit 60 stores the first image and the second image captured from the first image capturing unit 6 and the second image capturing unit 9, and performs an image (third image) after performing various image processing as necessary. And 4 images).

  The lens prescription information acquisition unit 61 acquires the lens prescription of the lens 2 to be blocked from a data server (not shown) via a network. The lens prescription information to be acquired includes values indicating optical characteristics such as spherical power, cylindrical power, addition power, astigmatism axis, and prism prescription value, and frame shape information. Used for lens alignment.

  The target lens shape image generation unit 62 generates frame image image data from the frame shape information in the lens prescription information acquired by the lens prescription information acquisition unit 61.

  The target lens shape recognition unit 63 recognizes the frame shape from the image image data generated by the target lens shape image generation unit 62.

  Further, the peripheral shape extraction unit 64 includes a mask processing unit 71, a first differentiation processing unit 72, a second differentiation processing unit 73, a leveling processing unit 74, a binarization processing unit 75, and an expansion processing unit 76. And a blob processing unit 77.

  The mask processing unit 71 is used to prevent unnecessary dust from being recognized as a blob before extracting the blob. Therefore, it is preferably performed before the first differentiation process, but the process may be performed in any process from the mask process to the expansion process as long as it is before the blob process. Specifically, the region on the image to be masked is set to luminance data “0”, and the luminance data of the other region is set to the maximum luminance (for example, “255”), and is superposed on the image to be masked. As a result, it is possible to set the brightness level “0” in an area where the mask processing target image does not exist, and to remove noise existing there.

  The first differentiation processing unit 72 has a function of enhancing the contour of the image input from the second imaging unit 9 and subjected to mask processing.

  The second differential processing unit 73 performs differential processing for extracting an outline on the image processed by the first differential processing unit 72.

  The leveling processing (smoothing) unit 74 smoothes the image processed by the second differentiation processing unit 73 so that the contrast between adjacent images becomes gentle. It is used to avoid the occurrence of fragmentation or loss of blob before binarization.

  The binarization processing unit 75 binarizes a gray image composed of several gradations of light and dark with a predetermined threshold value for the image processed by the leveling processing unit 74. The threshold value varies depending on the illuminance of the second illumination unit 7 and conditions such as opening and closing of the diaphragm included in the second imaging unit 9. In this example, lenses 2 having various refractive powers are set in advance, and a threshold value suitable for a detection target is set.

  The expansion processing unit 76 is used to compensate for the division or missing of the blob by expanding pixels having a predetermined brightness with respect to the image processed by the binarization processing unit 75. The expansion process is a process mainly used in a binary image. If even one pixel having luminance data “1” exists in the vicinity of the target pixel, the luminance data of the target pixel is set to “1”. The expansion process also has the concept of 4 neighborhoods, 8 neighborhoods, etc., and up to which pixel is considered centering on the pixel of interest, but in this case, the expansion process in 8 neighborhoods is preferable. The expansion process is not limited to a binary image.

  The blob processing unit 77 has a function of extracting a blob from the image processed by the binarization processing unit 75. For example, the blob area, the center of gravity position, the shape (whether it is round or square), etc. The characteristics of can be investigated.

  The shape determination unit 65 is in a state where the frame shape protrudes from the region of the lens 2 shape from the positional relationship between the shape of the lens 2 extracted by the peripheral shape extraction unit 64 and the frame shape recognized by the target lens shape recognition unit 63. Determine whether or not.

  The optical center detection unit 66 detects the optical center and the astigmatic axis direction of the lens 2 from the image captured by the first imaging unit 6. This is used for alignment of a single focus lens described later. FIG. 10 is a diagram for explaining the detection procedure in the astigmatic axis direction when aligning the single focus lens with the fixing device. FIG. 10A shows an elliptical image captured by the imaging device. b) shows an image obtained by extracting an elliptical peripheral shape from the image of (a), and FIG. 10C shows an image obtained by drawing a line segment from the center of the elliptical shape in FIG. FIG. 4D shows an image obtained by the logical product of (b) and (c). The astigmatic axis direction is detected by the following procedure. After extracting the outline of the elliptical projection image 45 that has passed through the circular window 43 shown in FIG. 6A to obtain the ring-shaped image I1 shown in FIG. 5B, the center of gravity position GC of the image I1 is obtained. A straight line image I2 shown in FIG. 5C is generated so as to intersect the peripheral edge (image I1 itself) in the right horizontal direction. Next, the image I1 and the image I2 are overlapped, and the logical product of both is obtained to obtain an image I3 shown in FIG.

  Thereafter, the center of gravity position P of the blob obtained by the logical result in the image I3 is obtained. Then, as shown in FIG. 10D, a distance L from the center of gravity position P of the blob to the center of gravity position GC of the image I1 is obtained. With the center of gravity GC of the image I1 as the center, the image I2 is generated for 360 degrees, for example, in units of 1 degree, and the above-described image processing is performed to determine the direction in which the distance L is the longest and the shortest. One of the directions corresponding to the astigmatism axis direction is the direction in which the distance L becomes the longest and the direction in which the distance L becomes the shortest by lens prescription. For example, in the case of an astigmatic lens having a condensing function, the direction (angle) in which the distance L is the shortest is influenced by the total refractive power that combines the spherical refractive power and the cylindrical refractive power, and the astigmatic axis direction is the distance. L is the longest angle.

  The image composition processing unit 67 synthesizes the blocking image and the layout image.

  Next, in the lens fixing device according to the present embodiment, the image data of the lens 2 imaged by the first imaging unit 6 and the second imaging unit 9 is subjected to software blocking and layout determination using the computer 11. Will be described. FIG. 11 shows a flowchart of a method for fixing a progressive multifocal lens. This will be described in detail with reference to FIG. The operation in the case of a single focus lens will be described later.

  The progressive multifocal lens is preliminarily provided with a layout print 31 as shown in FIG.

  First, in step S <b> 10, the first image of the lens 2 captured by the first imaging unit 6 is taken into the image storage unit 60 of the storage unit 52 through the index mask plate 4.

  Next, in step S <b> 15, the second image of the lens 2 captured by the second imaging unit 9 is taken into the image storage unit 60 of the storage unit 52. It displays on the display part 12 as needed.

  Next, in step S20, the lens prescription of the lens 2 to be blocked by the lens prescription information acquisition unit 61 is acquired from a data server (not shown) via a network using the management number assigned to the lens 2 as a search key. To do. The lens prescription information to be acquired includes values indicating optical characteristics such as spherical refractive power, cylindrical refractive power, addition power, astigmatism axis, prism prescription value, and frame shape information.

  Next, in step S25, frame image image data is generated from the frame shape information in the lens prescription information acquired by the lens prescription information acquisition unit 61 by the target lens shape image generation unit 62. The generated image image data is stored in the image storage unit 60.

  Next, in step S30, the frame shape is recognized from the image data generated by the target lens shape image generating unit 62 by the target lens shape recognition unit 63. The recognized frame shape is stored in the image storage unit 60 as a third image.

  Next, in step S35, the peripheral shape extraction unit 64 performs the process of the mask processing unit 71. Specifically, the luminance data “0” is set in the area on the image to be masked, and the luminance data in the other area is set to the maximum luminance (for example, “255”), and the image is overlapped with the image to be masked. As a result, it is possible to set the brightness level “0” in an area where the mask processing target image does not exist, and to remove noise existing there.

  Next, in step S40, the contour of the image is emphasized with respect to the image masked by the first differentiation processing unit 72 of the peripheral shape extracting unit 64.

  Next, in step S <b> 45, differential processing for extracting the contour is performed on the image data processed by the first differential processing unit 72 by the second differential processing unit 73 of the peripheral shape extracting unit 64.

  Next, in step S50, the leveling processing unit 74 of the peripheral shape extraction unit 64 performs smoothing so that the contrast between adjacent images becomes gentle.

  Next, in step S55, a gray image composed of several shades of light and dark is applied to the image data processed by the second differentiation processing unit 73 by the binarization processing unit 75 of the peripheral shape extraction unit 64. Binarize to black and white with threshold. Since the threshold value changes depending on conditions such as the illuminance of the second illumination unit 7 and the opening and closing of the diaphragm included in the second imaging unit 9, it cannot be generally stated. In this example, lenses 2 having various refractive powers are set in advance, and a threshold value suitable for a detection target is set.

  Next, in step S60, the image data processed by the binarization processing unit 75 by the expansion processing unit 76 of the peripheral shape extraction unit 64 is expanded with pixels having a predetermined brightness, thereby dividing the blob. Reduce omissions.

  Next, in step S65, blobs are extracted from the image data processed by the binarization processing unit 75 by the blob processing unit 77 of the peripheral shape extraction unit 64. As a result, characteristics such as the blob area, the center of gravity position, and the shape (round or square) can be examined.

  Next, in step S70, the lens 2 placed by the lens holding / moving unit (not shown) is moved from the alignment information of the first image so that Δx, Δy, and Δθ in FIG. While rotating, alignment is performed so that the final state shown in FIG. 5A and 5B ignore the influence of refraction of the lens 2 in order to simplify the explanation. Therefore, the layout print 31 and the reticle 44 are not distorted, but are distorted when they are affected by refraction due to the spherical power, cylindrical power, addition power, etc. of the lens 2. However, if the centers of the central reticle 44 and the cross mark 33 are substantially coincident with each other so that the reticle 44 and the horizontal line 34 are substantially coincident with each other, both are similarly affected by the refraction of the lens 2. The lens 2 can be aligned at a fixed position with reference to the mask plate 4.

  Next, in step S75, the shape (fourth image) of the lens 2 extracted by the peripheral shape extraction unit 64 by the shape determination unit 65 and the lens 46 of the lens shape recognized by the lens shape recognition unit 63 (third By confirming that the target lens 46 is not in the state of protruding from the region 47 of the lens 2 as shown in FIG. 7B, but in the state of FIG. Then, it is determined whether or not the target lens 46 protrudes from the region 47 of the lens 2. Although the determination result is not shown, the state of protruding from the area is output to the display unit 12 as “NG”, and the process ends.

  FIG. 13 shows an example of an image for blocking and layout determination. As shown in the figure, in steps S70 and S75, the image of the blocking (first image) and the image of the layout determination (third image, fourth image) are processed by the image composition processing unit 67 in FIG. Are synthesized like an image of the progressive multifocal lens and output to the display unit 12.

  Finally, in step S80, the state of the lens 2 that has been aligned is maintained, and the processing jig 14 attached to the processing jig mounting portion 10 by the processing jig mounting / moving portion (not shown) is centered on the point O. It rotates 180 degrees from point A to point B, and further descends from point B to point C to be fixed to the object side surface of the lens 2.

  Next, a case where the single focus lens is blocked will be described. FIG. 12 is a flowchart showing a method for fixing a single focus lens. A different process from the case of the progressive multifocal lens will be described with reference to FIG.

  First, step S22 is added after step S20, and the optical center detection unit 66 detects the optical center and the astigmatic axis direction of the lens 2 from the first image.

  Further, instead of step S70, step S72 is provided, and from the alignment information acquired by the lens prescription information acquisition unit 61, Δx and Δy in FIG. 6A are substantially 0, and Δθ is the astigmatic axis direction of the lens prescription. As shown in FIG. 6B, positioning is performed while moving and rotating the lens 2 placed by a lens holding / moving unit (not shown) so as to substantially match. By making the optical center substantially coincide with the center of the screen, the optical center of the lens 2 and the center of the processing jig 14 substantially coincide. If the astigmatic axis direction Δθ detected from the image coincides with the astigmatic axis direction of the prescription value, it becomes the same as the state (position, angle) in which the lens 2 is marked. In the case of the prism prescription lens 2, Δx and Δy do not become zero because it is necessary to align the position in accordance with the prism prescription.

As described above in detail, according to the present embodiment, the following effects can be obtained.
(1) By irradiating the lens 2 with ultraviolet light and directly capturing an image with a camera, a contour shape having a sufficient contrast can be obtained, thereby improving the accuracy of layout determination and simplifying the work.
(2) The influence of refraction due to the lens 2 that has occurred during the alignment of the progressive multifocal lens eliminates the possibility of an alignment error due to having positional information in the projected image itself, and blocking accuracy. Allows improvement and simplification of work.
(3) The marking operation of the single focus lens is not required, and the progressive multifocal lens and the single focus lens can be fixed to the lens 2 and the processing jig 14 with high accuracy using the same fixing device.
(4) Since there is no device switching at the time of blocking and layout determination, the operation can be simplified.
(5) Since it is not necessary to turn off the second illumination unit 7 during blocking, the operation can be simplified.
(6) Since it is not necessary to turn off the first illumination unit 3 at the time of layout determination, the work can be simplified.
(7) Since the blocking and layout determination can be performed simultaneously, the operation can be simplified.
(8) By making the layout determination automatically, it is possible to suppress determination errors by the operator.

(Second Embodiment)
FIG. 14 shows a lens fixing device in the present embodiment. The object side surface of the lens 2 is held by the lens holding unit 1, so that the processing jig mounting unit 10, the first illumination unit 3, the second illumination unit 7, the index mask plate 4, the screen 5, Unlike the fixing device shown in FIG. 1, the positional relationship among the half mirror 8, the first imaging unit 6, and the second imaging unit 9 is inverted. The basic configuration is the same as the lens fixing device described with reference to FIG. A through hole (not shown) through which the processing jig mounting portion 10 can move up and down is provided at the center of the lens holding portion 1.

  As described above in detail, according to the present embodiment, the same effect as that of the first embodiment can be obtained even when the object-side surface of the lens 2 is held by the lens holding unit 1.

In addition, this invention is not limited to said embodiment. For example, it can also be implemented in the following manner: (1) If the first illumination unit 3 uses light with a wavelength in the vicinity of the near infrared region (700 nm to 900 nm), the colored lens 2 has a sufficient amount of transmitted light. Since it is obtained, it is suitable.

  (2) When aligning the progressive multifocal lens not provided with the layout printing 31, the first illumination unit 3 emits a laser beam having good straightness so that the hidden mark 32 (see FIG. 3) can be projected. Use it.

  (3) The index mask plate 4 may be used by switching functions as shown in FIGS. 4B and 4C and switching depending on the type of the lens 2 to be aligned. FIG. 4B shows an index plate 4a used for alignment of a progressive multifocal lens, and FIG. 4C shows a mask plate 4b used for alignment of a single focus lens.

  (4) The index mask means is means used to align the lens 2 with a predetermined position of the processing jig 14.

  (5) The second image is selectively irradiated with only a specific wavelength included in the irradiation light by providing a filter that blocks light in a wavelength band that transmits the lens on one side or both sides of the lens 2; Alternatively, since the light can be received, an image with better contrast can be obtained more stably. The image obtained in this manner may be binarized by image processing to extract and recognize the peripheral shape of the lens.

  (6) In step S20, the lens prescription information can be input using an input device such as a keyboard connected to the computer 11. Of course, lens prescription information may be acquired using a computer other than the computer 11 and transmitted to the computer 11.

  (7) In step S70, the operator of the fixing device moves the mounted lens 2 so that Δx, Δy, and Δθ in FIG. 5A are substantially zero from the alignment information displayed on the display unit 12. While moving and rotating, alignment may be performed so that the final state shown in FIG.

  (8) The blocking and layout determination images in steps S70 and S75 may be displayed in different areas on the screen, or may be displayed by switching the display screen.

  (9) In step S80, the processing jig mounting portion 10 has a structure that rotates 180 degrees around the point O in FIG. 1, but the chuck 15 can be moved to the point B by rotating 90 degrees. The position of point A may be determined. Moreover, you may make it perform a series of operation | movement of the processing jig attachment part 10 manually.

  (10) In step S72, from the alignment information displayed on the display unit 12 by the fixing device operator, Δx and Δy in FIG. 6A are substantially 0, and Δθ is substantially coincident with the astigmatic axis direction of the lens prescription. As described above, the lens 2 placed may be moved and rotated, and the alignment may be performed so that the final state shown in FIG.

  Below, the technical idea grasped | ascertained from each said embodiment and each modification is described.

  (1) In any one of claims 1 to 4, when the lens is a single focus lens, an optical center detection unit that detects an optical center and an astigmatic axis direction of the lens from an image captured by the first imaging unit. The gist is to further provide. According to this, the marking operation of the single focus lens becomes unnecessary, and the progressive multifocal lens and the single focus lens can be fixed to the lens and the processing jig with high accuracy by using the same fixing device.

  (2) A fixing device for fixing a processing jig used when processing a spectacle lens into a frame shape to the spectacle lens, a lens prescription information acquisition unit for acquiring a lens prescription of the spectacle lens, and the spectacle lens A lens holding unit for holding the lens, an index mask plate provided with a predetermined pattern, a first illumination unit for irradiating the spectacle lens with parallel light through the index mask plate, and irradiation by the first illumination unit A screen that projects the projected light, a first imaging unit that captures an image projected on the screen, a second illumination unit that irradiates at least the periphery of the spectacle lens with ultraviolet light, and the second illumination unit A second imaging unit that images the vicinity of the peripheral part of the spectacle lens by irradiating, and a peripheral shape extracting unit that extracts the peripheral part shape of the spectacle lens from the image captured by the second imaging unit The display unit for displaying the lens prescription information and the spectacle frame shape information acquired by the lens prescription information acquisition unit, the photographed image by the first imaging unit, and the peripheral shape information extracted by the peripheral shape extraction unit; The gist of the present invention is to include a processing jig attaching portion for attaching a processing jig to the spectacle lens in a predetermined positional relationship with the index mask plate. According to this, the accuracy of blocking can be improved and the operation can be simplified by suppressing the influence of refraction by the spectacle lens as much as possible. Further, by irradiating the spectacle lens with ultraviolet light and directly capturing an image with a camera, an outline shape having sufficient contrast can be obtained, thereby improving the accuracy of layout determination and simplifying the operation.

  (3) In the technical idea (2), the shape determination unit that determines whether or not the frame shape falls within the range of the peripheral shape of the spectacle lens, and the shape determination information determined by the shape determination unit Further, the gist includes providing the display unit for displaying. According to this, a determination mistake by an operator can be suppressed by automatically determining the layout.

  (4) In the technical idea (2) or (3), the shape determination unit is configured to warn the display unit of an abnormality when the frame shape does not fall within a range of the peripheral shape of the spectacle lens. The gist is to display. According to this, a determination mistake by an operator can be suppressed by determining the layout automatically.

  (5) In any one of the technical ideas (2) to (4), when the spectacle lens is a single focus lens, an optical center and astigmatism of the spectacle lens from an image captured by the first imaging unit. The gist is to further include an optical center detector for detecting the axial direction. According to this, the marking operation of the single focus lens becomes unnecessary, and the spectacle lens and the processing jig can be fixed with high accuracy by using the same fixing device for the progressive multifocal lens and the single focus lens.

  (6) A fixing method for fixing a processing jig used when processing a spectacle lens into a frame shape to the spectacle lens, the step of holding the spectacle lens, and an index mask plate provided with a predetermined pattern Irradiating the spectacle lens with parallel light through the first illumination unit, projecting it onto the screen, and imaging the image projected onto the screen with the first imaging unit, and at least the vicinity of the peripheral part of the spectacle lens Is irradiated by a second illumination unit that emits ultraviolet light, and the second imaging unit images the vicinity of the peripheral part of the spectacle lens, and the shape of the peripheral part of the spectacle lens is determined from the image captured by the second imaging unit. Extracting and displaying the frame shape and the peripheral edge shape on the display unit to determine whether or not the frame shape is within the range of the peripheral edge shape of the spectacle lens. A step of the processing tool and the indication mask plate is summarized in that and a step of fixing the jig to the spectacle lens so as to have a predetermined positional relationship. According to this, the accuracy of blocking can be improved and the operation can be simplified by suppressing the influence of refraction by the spectacle lens as much as possible. Further, by irradiating the spectacle lens with ultraviolet light and directly capturing an image with a camera, a contour shape having a sufficient contrast can be obtained, thereby improving the accuracy of layout determination and simplifying the operation.

  (7) In the technical idea (6), when the spectacle lens is a progressive multifocal lens, the image captured by the first imaging unit is displayed on the display unit and provided on the index mask plate. The present invention further includes a step of aligning the spectacle lens so that the pattern and the alignment mark of the spectacle lens have a predetermined positional relationship. According to this, since the projected image itself has position information, it is possible to suppress as much as possible the influence of refraction caused by the spectacle lens that has occurred during the alignment of the progressive multifocal lens, and the alignment error is reduced. This eliminates the possibility of occurrence, and makes it possible to improve the accuracy of blocking and simplify the work.

  (8) In the technical idea (6), when the spectacle lens is a single focus lens, detecting the optical center and the astigmatic axis direction of the spectacle lens from an image captured by the first imaging unit; The gist of the present invention is to further include a step of displaying the detection result and the spectacle prescription of the spectacle lens on the display unit and aligning the spectacle lens. According to this, the marking operation of the single focus lens becomes unnecessary, and the spectacle lens and the processing jig can be fixed with high accuracy by using the same fixing device for the progressive multifocal lens and the single focus lens.

(9) In the technical idea (7), when the spectacle lens is a progressive multifocal lens, the frame shape and the peripheral shape are displayed on a display unit, and the frame shape is a peripheral portion of the spectacle lens. A step of determining whether or not the shape falls within the range of the shape; and an image captured by the first imaging unit is displayed on the display unit, and the pattern provided on the index mask plate and the eyeglass lens are aligned. The gist is that the step of aligning the spectacle lens so that the marks have a predetermined positional relationship can be performed simultaneously. According to this, since there is no switching of the device at the time of blocking and layout determination, the work can be simplified.

  (10) In the technical idea (8), when the spectacle lens is a single focus lens, the frame shape and the peripheral shape are displayed on a display unit, and the frame shape is the peripheral shape of the spectacle lens. And the step of determining whether or not the distance is within the range of the image and the step of displaying the detection result and the spectacle prescription of the spectacle lens on the display unit and aligning the spectacle lens can be performed simultaneously. And According to this, since there is no switching of the device at the time of blocking and layout determination, the work can be simplified.

FIG. 3 is a schematic side view showing a lens fixing device according to the first embodiment. The top view which shows the lens holding part 1 of a fixing device. The figure which shows an example of the layout printing and hidden mark which were attached | subjected to the lens. It is a figure which shows an example of an index plate and a mask board, (a) is the figure which formed the index board and the mask board in one base board, (b) is the figure which formed only the index board in the base board, (c) ) Is a diagram in which only the mask plate is formed on the base plate. It is a figure which shows the state which has aligned the progressive multifocal lens with the fixing device, (a) is a state immediately after mounting a lens, (b) is a figure which shows the state which alignment was completed. It is a figure which shows the state which has aligned the single focus lens with the fixing device, (a) is a state immediately after mounting a lens, (b) is a figure which shows the state which alignment was completed. The figure which shows an example of the screen state of layout determination. The functional block diagram of a computer. The block diagram which shows the internal structure of the memory | storage part of a computer. It is a figure explaining the detection procedure of the astigmatic axis direction at the time of aligning a single focus lens with a fixing device, (b) is an ellipse from the image of (a). An image obtained by extracting the peripheral shape of the shape, (c) is an image obtained by drawing a line segment from the center of gravity of the elliptical shape in (a) to the elliptical peripheral portion, and (d) is a logical product of (b) and (c). The figure which shows the image obtained by. The flowchart which shows the adhering method of a progressive multifocal lens. The flowchart which shows the adhering method of a single focus lens. The figure which shows an example of the state of blocking and layout determination. The schematic side view which shows the fixing device by 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Lens holding part 2 ... Lens 3 ... 1st illumination part 4 ... Indicator mask board 4a as an indicator mask means ... Indicator board 4b ... Mask plate 5 ... Screen 6 ... 1st imaging part 7 ... 2nd illumination part 8 ... Half Mirror 9 ... Second imaging unit 10 ... Processing jig mounting part 11 ... Computer 12 ... Display unit 13 ... Light source 14 ... Processing jig 15 ... Chuck 16 ... Notch 21 ... Base R plate 22 ... Terminal 31 ... Layout printing 32 ... Hidden mark 33 ... cross mark 34 ... horizontal line 41 ... base S plate 42 ... window 43 ... circular window 44 ... reticle 45 ... ellipsoidal projection image 46 ... lens-shaped lens 47 ... lens 2 area 51 ... CPU ( Central processing unit)
52 ... storage unit 53 ... first input unit 54 ... second input unit 55 ... third input unit 56 ... input / output unit 60 ... image storage unit 61 ... lens prescription information acquisition unit 62 ... target lens shape image generation unit 63 ... ball Mold shape recognition unit 64 ... peripheral shape extraction unit 65 ... shape determination unit 66 ... optical center detection unit 67 ... image composition processing unit 71 ... mask processing unit 72 ... first differentiation processing unit 73 ... second differentiation processing unit 74 ... leveling Processing unit 75 ... Binarization processing unit 76 ... Expansion processing unit 77 ... Blob processing unit

Claims (5)

A fixing device for fixing a processing jig used when processing a lens into a predetermined frame shape to the lens,
A lens holding unit for holding the lens; a first illumination unit for irradiating the lens with parallel light; a screen for projecting an image of the lens illuminated by the first illumination unit; and an image projected on the screen A second imaging unit that images an image of the lens irradiated by the second illumination unit, a second imaging unit that irradiates at least the periphery of the lens with ultraviolet light, A peripheral shape extraction unit that extracts a peripheral shape image of the lens from an image captured by the second imaging unit, a lens prescription information acquisition unit that acquires lens prescription information of the lens, the lens and the processing jig, Index mask means for representing the alignment information, a display section for displaying the alignment information image by the index mask means, the peripheral shape image, and the lens prescription information, and the lens Anchoring device of the lens, characterized in that it comprises a processing jig attachment section for attaching the engineering tool.   The first illumination unit and the second illumination unit are arranged to face each other with the lens held by the lens holding unit interposed between the first illumination unit and the first imaging unit, Transmits light that is projected from the first illumination unit and projects an image captured by the first imaging unit onto the screen, and transmits ultraviolet light emitted from the second illumination unit to the second imaging unit. The lens fixing device according to claim 1, wherein a reflecting half mirror is arranged.   A shape determining unit for determining whether or not the frame shape is within a range of a peripheral shape of the lens; and a warning is displayed when the frame shape is not within the range of a peripheral shape of the lens. The lens fixing device according to claim 1, further comprising a display unit.   The index mask means includes an index mask plate provided with a predetermined pattern used for alignment of the lens between the first illumination unit and the lens. The lens fixing device according to claim 1. A fixing method for fixing a processing jig used when processing a lens into a predetermined frame shape to the lens,
Holding the lens, irradiating the lens with parallel light, capturing an image projected on a screen to obtain a first image, and irradiating at least the periphery of the lens with ultraviolet light A step of capturing an image of the lens to obtain a second image, a step of obtaining a frame image from lens prescription information of the lens to obtain a third image, and a peripheral shape of the lens from the second image Extracting an image to obtain a fourth image, displaying the first image including alignment information between the lens and the processing jig, and the third and fourth images on the display unit And a step of attaching a processing jig to the lens after aligning with the image displayed on the display unit.

Images