JPH0679600A - Positioning device for spectacle lens - Google Patents

Abstract

PURPOSE:To provide a positioning device for spectacle lens, which is simple and superior in its positioning accuracy. CONSTITUTION:A lens to be processed is rested on a rest means of a slide table 1b, and the prescribed shape mark of the lens to be processed rested on the rest means is photographed by a video camera 1a. On the other hand, the originally desired position of the prescribed shape mark of the to be processed lens referred to the processing standard position, is calculated by a host computer. Next, the prescribed shape mark of the lens to be processed is displayed at the originally desired position, calculated by the host computer based on the processing standard position, on a TV monitor 3, and the prescribed shape mark of the lens to be processed photographed by the video camera 1a, is also displayed at the same time. Then, the lens to be processed rested on the rest means is moved to the processing standard position, so that both prescribed shape marks displayed on the TV monitor 3 are matched with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eyeglass lens alignment device for aligning a lens to be processed at a processing reference position, and more particularly to a processing reference position of a processing device when processing the back surface or edging of an eyeglass lens. The present invention relates to an eyeglass lens alignment device used for aligning a lens to be processed.

[0002]

2. Description of the Related Art In an eyeglass lens, as shown in FIG. 5, for example, in a double focus lens, the optical center position of the double focus lens (in the case of an aspherical lens, the power measurement position),
The small lens positions and the like are arranged on the basis of a predetermined optical layout determined in advance by the manufacturer, and then manufactured. Many types of optical layouts are prepared for various spectacle wearers. FIG. 5 is a layout diagram showing an example of the optical layout of the double focus lens, and the unit of the length shown in the figure is mm.

In general, such a lens is stocked by the manufacturer with the concave surface (back surface) side of the lens left unprocessed (semi-finished lens). Then, when the prescription value of the spectacle wearer is determined and an order is received from the consumer (such as a spectacle store), the manufacturer side processes conditions (curvature radius, prism value, astigmatic axis direction, lens thickness, etc.) according to the prescription value. Then, the concave surface (back surface) of the lens is processed.

Prior to this processing, it is important to properly attach the lens to a lens processing jig or a processing apparatus. That is, the lens to be processed needs to be properly positioned on the processing jig or the processing device with respect to a predetermined processing reference position.

Generally, as shown in FIG. 5, the processing reference points of the lens to be processed in the concave (back) processing of the lens are a horizontal reference line 61 and a vertical reference line 62 passing through the geometric center point 60 of the semi-finished lens. Specified by reference. Therefore, when processing the lens, the horizontal reference line 61 and the vertical reference line 62 are marked on the lens surface with erasable white paint, and the reference line is used as a processing reference to position the lens on a jig or the like and to perform polishing or the like. Is processed.

Conventionally, to mark these reference lines, for example, in a double focus lens, based on the small lens position 63,
Derive the geometrical center point 60 according to the optical layout,
Marking was done by this. Further, the geometrical center point 60 has been derived with reference to a predetermined cutout portion provided on the end surface of the lens.

[0007]

However, the small ball position 63
In the first conventional method for deriving the geometric center point 60 based on, there is a problem that the calculation process for deriving is complicated because the layout position, shape, size, etc. of the small balls themselves are various. It was Further, in the second conventional method of deriving the geometrical center point 60 with reference to a predetermined cutout portion, the cutout work is complicated, and the cutout accuracy varies, so that the arbitrary placement position can be achieved. It is complicated to grasp the mounting state of the machine and calculate the adjustment amount to match the processing reference position.
There was a problem in its accuracy.

In particular, unless the geometrical center point 60 is accurately derived, a lens according to a prescribed value cannot be processed accurately, so that the processing accuracy and yield in the subsequent processes such as lens edging will be greatly affected. To go. Therefore, the geometric center point 6
There was a need to provide a device that could easily mark the exact position of 0 on the lens.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a spectacle lens alignment device that is simple and has excellent alignment accuracy.

[0010]

In order to solve the above-mentioned problems, the present invention places a lens to be processed and a mounting means capable of moving the lens to a processing reference position, and a mounting means. A photographing means for photographing a predetermined shape mark of the lens to be processed placed on the substrate, a position calculating means for calculating the original position of the predetermined shape mark of the lens to be processed with respect to the processing reference position, and a processing reference position as a reference. And a screen display means for displaying the predetermined shape mark of the lens to be processed at the original position calculated by the position calculation means and simultaneously displaying the predetermined shape mark of the lens to be processed photographed by the photographing means. A featured spectacle lens alignment device is provided.

Further, by moving the lens to be processed placed on the placing means, on the display screen of the screen display means,
When the predetermined shape mark of the lens to be processed displayed by the position calculating means at the original position and the predetermined shape mark of the lens to be processed photographed by the photographing means match, a mark indicating the processing reference position is marked. It further has a mark writing means to be marked on the processed lens.

[0012]

With the above construction, first, the lens to be processed is mounted on the mounting means, and the photographing means photographs the predetermined shape mark of the lens to be processed mounted on the mounting means.

On the other hand, the position calculating means calculates the original position of the mark having the predetermined shape of the lens to be processed with respect to the processing reference position. Then, on the display screen of the screen display means, the predetermined shape mark of the lens to be processed is displayed at the original position calculated by the position calculating means with reference to the processing reference position, and the lens to be processed photographed by the photographing means is displayed. A predetermined shape mark is displayed at the same time.

The lens to be processed mounted on the mounting means is moved with respect to the processing reference position so that the marks having the predetermined shapes displayed on the display screen of the screen display means coincide with each other. As a result, the lens to be processed is accurately positioned with respect to the processing reference position.

Further, when both the marks having the predetermined shapes match, a mark indicating the processing reference position is marked on the lens to be processed by the mark writing means. Based on this mark, the lens to be processed is positioned on a processing jig or a processing device.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall configuration diagram of an eyeglass lens alignment device according to the present invention. This device is a semi-finished lens that is a semi-finished product with convex surface processing, especially a semi-finished lens with double focus, that marks the machining reference line that passes through the geometric center point. The formed lens is mounted on the processing jig according to the mark, and the back surface (concave surface) of the lens is processed based on the prescription value.

First, the marking device 1 comprises a video camera 1a, a slide table 1b, a pad printer 1c, etc., a mechanism for adjusting the lens to be processed to a predetermined position, and a processing reference line on the surface of the lens to be processed. And a stamping mechanism. The detailed configuration of the marking device 1 will be described later with reference to FIGS. 2 and 3.

A line image processing device (graphic controller) 2 is connected to the video camera 1a of the marking device 1, and a television monitor 3 and a microcomputer 4 are connected to the line image processing device 2. As will be described later, the video camera 1 a captures the contour line of the small lens of the lens to be processed and sends the image to the line image processing device 2. The line image processing device 2 converts the later-described data sent from the microcomputer 4 into a luminance signal, synchronizes the luminance signal with the image signal from the video camera 1a, and combines them at the same time at the same time as the television monitor 3
To display.

A host computer (not shown) is connected to the microcomputer 4, a bar code reader 5 is connected thereto, and a slide table 1b of the marking device 1 is connected via a driving device 6. The barcode reader 5 reads a barcode for identifying the lens to be processed described in the processing instruction attached to each lens to be processed, and sends it to the host computer via the microcomputer 4. The host computer retrieves the information corresponding to the barcode from the lens processing information stored in advance and performs the necessary numerical calculation for that lens.
The calculation result of the lens processing information is sent to the microcomputer 4. The calculation result is contour image data of the small ball with respect to the geometric center position, which is determined according to a predetermined layout.

The microcomputer 4 sends to the line image processing device 2 the outline image data of the small ball sent from the host computer. In addition, the microcomputer 4 performs sequence control of the slide table 1b of the marking device 1 via the drive device 6 as described later, and controls communication with the host computer.

FIG. 2 is a front view of the marking device 1 showing the internal structure of the marking device 1. In the figure, a lens 7 to be processed is placed on a slide table 1b, and a video camera 1a is fixed directly above the lens 7 to be processed by a support 1cc. The slide table 1b moves a mounting part for mounting the lens 7 to be processed, a light projecting part for sending light to the lens 7 to be processed, and a mounting part for positioning the left and right eyeglass lenses directly below the video camera 1a. The detailed configuration of the placing unit and the light projecting unit will be described later with reference to FIG. The moving unit is connected to the microcomputer 4 via the driving device 6 and moves by a distance corresponding to a predetermined interval between the left and right eyeglass lenses.

The video camera 1a has a focal length of 28, for example.
It consists of a CCD camera with a lens of mm, and is 70 cm from the screen 8 (described later) on the lens 7 to be processed.
Fixed in position. The distance of 70 cm is a distance determined in consideration of the fact that the small portion and the entire lens can be visually recognized in good balance on the screen of the TV monitor 3 having a normal size. Also here
A CCD camera is used which has low image distortion and high fidelity and is relatively not saturated even in strong light, but a vidicon camera may be used in consideration of resolution, ease of size adjustment and the like.

The pad printing machine 1c is a commercially available pad printing machine, and comprises a transfer pad 1ca, a stamp board 1cb and the like. The transfer pad 1ca is movable in the horizontal direction and the vertical direction, and as shown in FIG. 2, the transfer pad 1ca may be located right above the lens 7 to be processed, which is placed on the slide table 1b. You can also move away from directly above. The stamp base 1cb is preliminarily prepared with transfer ink in the shape of a cross mark corresponding to the processing reference line, and the transfer pad 1ca copies this cross mark on the pad surface and transfers it to the lens 7 to be processed. . Note that in FIG. 2, the pad printer 1c exists between the video camera 1a and the lens 7 to be processed, and it seems as if the lens 7 to be processed cannot be seen through from the video camera 1a. The position of the pad 1ca at the time of transfer is not directly below the video camera 1a and is displaced in the depth direction in FIG. It is designed to move directly below. Therefore, the video camera 1a
Can see through the lens 7 to be processed (although the screen 8 is actually present).

FIG. 3 is a sectional view showing the detailed construction of the mounting portion and the light projecting portion of the slide table 1b. In the figure, the concave (back) side of the lens 7 to be processed is a rubber O-ring 31.
Placed directly on. The O-ring 31 is provided on the upper end of the lens support portion 32 and has a cushioning function and a sealing function. The lens support portion 32 is formed of a light-shielding tubular hollow member, and has a condenser lens 33 and an infrared cut filter 34 in its internal space. The condenser lens 33 is a plastic lens containing diethylene glycol bisallyl carbonate as a main component, has excellent transparency, and condenses light from the light source to project it as a parallel light flux onto the lens 7 to be processed. The infrared cut filter 34 is for blocking heat from the light source and protecting built-in parts. The condenser lens 33 is provided with a through hole 33a, and an exhaust device (not shown) is provided in the space 35 between the condenser lens 33 and the infrared cut filter 34. Ring 3
It is designed to be in close contact with 1. As will be described later, when the present alignment device is used for edging the lens, the material is highly elastic and has a good shape so that the curve of the lens surface can be used instead of the O-ring. Also, a V-ring having a V-shaped cross section with increased adhesion is used.

A light guide tube 36 is provided at the lower end of the lens support portion 32, and a halogen lamp 37 serving as a light source is provided at the lower end of the light guide tube 36. Further, immediately above the convex surface of the lens 7 to be processed, a flat acrylic plate 38 and a ground glass 39 stacked on the acrylic plate 38 are provided. The acrylic plate 38 is made of acrylic resin having high transparency. The acrylic plate 38 and the frosted glass 39 compose the screen 8 described above. The acrylic plate 38 and the frosted glass 39 are arranged on the lens 7 to be processed when the transfer pad 1ca transfers the lens 7 to the lens 7. It is designed to move horizontally from.

With the above configuration, the light projected from the halogen lamp 37 passes through the infrared cut filter 34, reaches the condenser lens 33, and is irradiated onto the lens 7 to be processed as a parallel light flux.

In the double-focused lens 7 to be processed, the small balls are made of a material different from that of the pedestal, have different refractive indexes, and the lens surface is not a continuous curve. Birefringence occurs at the boundary between the and Kodama, and the outline of the Kodama appears as a difference in brightness. The transmitted light of the processed lens 7 including the difference in brightness is projected onto the frosted glass 3 through the acrylic plate 38 and is diffusely reflected by the frosted glass 3. Therefore, the outline of the small ball appears as an image on the surface of the ground glass 3. The light projected on the surface of the frosted glass 3 is irregularly reflected and becomes scattered light having no directivity, so that the difference in brightness and darkness is further enhanced, and the outline of the small ball is more clearly projected.

Next, the process up to stamping the processing reference line on the lens to be processed with the configuration shown in FIGS. First, the double-focused lens 7 to be processed is first placed on the O-ring 31 of the lens support 32 at an arbitrary position. Then, the outline of the small ball reflected on the surface of the ground glass 3 is photographed by the video camera 1a. At this time, the transfer pad 1ca is moved horizontally and is separated from directly above the lens 7 to be processed.

The contour line of the small ball photographed by the video camera 1a is faithfully displayed on the screen of the television monitor 3 through the line image processing device 2. FIG. 4 is a diagram showing a display screen of the television monitor 3. On the screen 41, a real image 42 of the contour line of a small ball taken by the video camera 1a is displayed, for example, as shown in FIG.

On the other hand, based on the bar code for identifying the lens to be processed from the bar code reader 5, the host computer stores lens information including optical information of this lens stored in advance (for example, single focus or multi focus). Each focal point, lens diameter, small lens shape, small lens diameter, spherical refractive power, astigmatic refractive power, astigmatic axis, prism value, addition power, left and right eye type, refractive index, radius of curvature, etc. The contour image of the small ball is calculated for the geometrical center position determined according to (distance center position, near center position, distance eye point, near position, etc.). The calculated data is sent to the television monitor 3 as a luminance signal via the line image processing device 2, and based on a preset reference position on the monitor screen,
It is displayed as the reference image 43 (FIG. 4) of the outline image of the small ball. This reference image 43 is an image of the same size as the actual image 42, and the contour image of the small ball is the geometric center position (processing reference position).
In contrast, it is displayed at the position where it should be.

Therefore, the operator moves the lens 7 to be processed on the O-ring 31 of the lens supporting portion 32, and the actual image 4 of the contour line of the small lens displayed on the screen of the television monitor 3 is displayed.
2 is superimposed on the reference image 43. The position of the lens 7 to be processed at the time of this overlap is the position that the lens 7 to be processed should originally be with respect to the geometric center position (processing reference position). At this time, the exhaust device is operated to bring the lens 7 into close contact with the O-ring 31 so that the lens 7 does not move.

Next, the transfer pad 1ca moves to the lens 7 to be processed at its original position, and the cross mark corresponding to the processing reference line is transferred to a predetermined position of the lens 7 to be processed (at this time). , The screen 8 is the lens 7 to be processed
It has been moved horizontally from above). After that,
The lens 7 to be processed is removed from the lens support 32, a processing jig is attached to the cross mark, and the back surface of the lens is processed.

The above operations are performed for the left and right spectacle lenses by moving the slide table 1b. As described above, since the position of the lens 7 to be processed can be adjusted while observing the image displayed on the TV monitor 3, the position adjustment operation is very simple, and the reference image 43 displayed on the TV monitor 3 is precisely original. Since it is possible to display at the correct position, it is possible to provide a positioning device having extremely excellent positioning accuracy.

In the above embodiments, the case where the lens 7 to be processed is a double focus lens has been described, but the present invention can of course be applied to a case where the lens 7 to be processed is a multifocal lens or a progressive lens. The present invention can be applied even when the lens 7 to be processed is a single focus lens. That is, in the case of a monofocal lens, a lens meter is used to stamp three-point marks indicating the optical center and the astigmatic axis direction on the lens surface in advance, and the actual image of the three-point mark of this lens is displayed on the television monitor 3. In addition, the host computer calculates the position where the three-point mark should be and displays it on the TV monitor 3 so that they overlap each other.
Can be aligned. However, in this case, the screen 8 is unnecessary.

In the above embodiments, the case where the back surface of the lens is processed has been described. However, the present invention can be applied to the case where the lens edge processing is performed. In this case, the original position of the contour line of the lens or the three-point mark of the lens to be processed, which is calculated by the host computer, is determined based on not only the lens information but also the eyeglass frame information and the prescription value.

Further, although the bar code reader 5 is used in the above embodiments, the keyboard input device manually inputs the code for identifying the lens to be processed described in the processing instruction attached to each lens to be processed. You may do it.

[0037]

As described above, according to the present invention, the position of the lens 7 to be processed can be adjusted while observing the actual image of the predetermined shape mark of the lens to be processed displayed on the television monitor and the reference image which should be the original position. The alignment operation is very simple, and the reference image displayed on the TV monitor can be precisely displayed at the position where it should be. Therefore, it is possible to provide a position alignment device with extremely excellent alignment accuracy. You can

Further, when the lens to be processed is a multifocal lens, the contour shape of the lens caused by different focal lengths is used as the predetermined shape mark, and when the lens to be processed is a single focus lens. Since the three-point mark written on the lens to be processed is used as the predetermined shape mark, it is possible to provide a simple alignment device excellent in alignment accuracy regardless of the type of focus.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a spectacle lens alignment device according to the present invention.

FIG. 2 is a front view of the marking device showing an internal configuration of the marking device.

FIG. 3 is a cross-sectional view showing a detailed configuration of a mounting portion and a light projecting portion of the slide table.

FIG. 4 is a diagram showing a display screen of a television monitor.

FIG. 5 is a layout diagram showing an example of an optical layout of a double focus lens.

[Explanation of symbols]

 1 Marking Device 1a Video Camera 1b Slide Table 1c Pad Printing Machine 2 Wire Image Processing Device 3 Television Monitor 4 Microcomputer 5 Bar Code Reader 6 Driving Device

Claims (2)

[Claims] 1. A positioning device for a spectacle lens for positioning a lens to be processed at a processing reference position, the mounting means being capable of mounting the lens to be processed and moving the lens to be processed with respect to the processing reference position. And a photographing means for photographing a predetermined shape mark of the lens to be processed placed on the placing means, and a position calculation for calculating the original position of the predetermined shape mark of the lens to be processed with respect to the processing reference position. And a predetermined shape mark of the lens to be processed at the original position calculated by the position calculation means with reference to the processing reference position, and a predetermined shape mark of the lens to be processed photographed by the photographing means. And a screen display unit for displaying simultaneously, and a device for aligning eyeglass lenses. 2. The workpiece to be processed displayed on the display screen of the screen display means at the original position calculated by the position calculating means by moving the lens to be processed placed on the placing means. A mark writing means for writing a mark indicating the processing reference position on the lens to be processed when the predetermined shape mark on the lens and the predetermined shape mark on the lens to be processed photographed by the photographing means coincide with each other. The spectacle lens alignment device according to claim 1.