JPH1034508A - Lens shape display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To concretely grasp the correct position of a lens edge vertex by obtaining a lens edge vertex position of splitting edge thickness at a requested ratio, on the basis of globe shape information of a spectacle frame and edge thickness information of a spectacle lens, and displaying with graduation marked on lens edge shape formed after machining. SOLUTION: The shape of a lens frame of a spectacle frame is measured by a frame shape measuring device 1, and radius vector information ρi , θi of its lens edge locus is stored in a memory 2. The moving quantities of moving feelers 33, 34 of a measuring device 3 into a position of radius vector length ρi are inputted to an arithmetic unit 5 to obtain edge thickness, and then a lens edge vertex position of splitting a maximum edge at a predetermined edge split ratio m:n, and a lens edge vertex position of splitting a minimum edge at an edge split ratio p:q are obtained from the combination of the value of maximum edge thickness and minimum edge thickness. The cross-sectional shape of the lens edge is then displayed schematically on a display device 7, along with the lens edge curve value obtained from the radius-of-curvature of the lens edge curved surface, and the lens edge vertex distance of the maximum and minimum edges.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens shape display device for displaying an expected shape of a processed spectacle lens based on information on a target lens shape of a spectacle frame and information on an edge thickness of a spectacle lens.

[0002]

2. Description of the Related Art Some ball mills have been proposed by the applicant of the present invention in Japanese Patent Application No. 60-115079. This ball mill is provided with an edge thickness measuring means for measuring the edge thickness from each edge value of the front and rear refraction surfaces of the unprocessed lens in accordance with the radial length of the lens frame, and the edge thickness measuring means. It has calculation means for obtaining the edge thickness based on the measurement signal output from the device and calculating the bevel curve at the top surface of the bevel, and display means for displaying the shape of the bevel cross section. The bevel apex surface includes a bevel apex position where the edge thickness is divided at a desired ratio.

In this conventional apparatus, as shown in FIG. 6, radial information (ρ _i , θ _i ) corresponding to a lens frame shape (bevel groove locus) of an eyeglass frame is obtained, and as shown in FIG.
The edge thickness of the unprocessed lens is determined in accordance with the radial information (ρ _i , θ _i ), and the edges of the maximum width W ₁ and the minimum width W ₂ are found among the determined edge thicknesses, and the edge thickness W ₁ , the bevel apex position y _e dividing the W ₂ in a desired ratio, so that determining the position of y _e.

[0004] Moreover, in this apparatus, the bevel apex y _e defined in this way, obtains a bevel curve y _c of the bevel aspects including y _e, bevel shape y ₁ after beveling up edge, at the minimum edge, y ₂ Only the configuration shown in FIG. 8 is schematically displayed on the display.

[0005]

However, in the conventional lens shape display device of the ball mill, the bevel shape y
₁ and y ₂ are only shown relative to each other, and each bevel shape y ₁ , y ₂
y ₂ is not know formed where the edge position of such lens shape of the lens frame LF.

Therefore, when the lens L is framed in the lens frame LF, it is necessary to frame the front face F of the lens frame LF so as to match the edge K of the lens L as shown in FIG. It was not easy for a novice in industry.

This is because the correspondence between the edge position of the lens shape such as the lens frame LF and the beveled shape of the processed lens L is not clear.

Accordingly, the present invention enables the front end of the lens frame to coincide with the front edge of the lens (to make the lens frame look good) even if the eyeglass processing company is a beginner, and the lens is mounted on the lens frame. It is an object of the present invention to provide a lens shape display device capable of specifically grasping an accurate position of a bevel apex in a bevel shape for beveling to be framed.

[0009]

In order to achieve this object, the present invention provides a lens shape display for displaying an expected shape of a processed spectacle lens based on information on a target lens shape of a spectacle frame and information on an edge thickness of a spectacle lens. In the apparatus, the lens shape display device may include a calculating means for obtaining a bevel apex position for dividing the edge thickness at a desired ratio, and a display means for displaying a bevel shape formed after processing with a scale. Features.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram illustrating a beveling machine according to the present invention, in particular, a bevel shape display system.

In FIG. 1, 1 is a frame shape measuring device, 2
Is a memory, and 3 is a measuring device for measuring the position of the refractive surface of the lens.

The frame shape measuring apparatus 1 calculates the shape of the lens frame LF of the spectacle frame, more precisely, the bevel groove trajectory as shown in FIG. 6 by using radial information (ρ _i , θ _i ) [i = 1, 2 , 3,
... N]. The detailed configuration and operation of this frame shape measuring device 1 are described in the aforementioned Japanese Patent Application
It is the same as that disclosed in Japanese Patent Application No. 0-115079 and Japanese Patent Application No. 60-287491. The radial information (ρ _i , θ _i ) measured by the frame shape measuring device 1 is stored in the memory 2.

The measuring device 3 includes a pulse motor 32, a support table 31 approaching and moving away from the lens L by driving the pulse motor 32, a front refracting surface and a rear refracting surface of the lens L disposed on the support table 31. And encoders 35 and 36 mounted on the support base 31 so that the amount of movement of the fillers 33 and 34 can be detected.

On the other hand, the lens L is sandwiched between the lens rotating shafts 4 of the carriage (not shown), and the lens rotating shafts 4 are rotatably driven by a pulse motor 37. Accordingly, the lens L is rotated by the pulse motor 37 on the lens rotation axis.
It is designed to be able to be rotated together with 4,4. A radial angle θ _i from the memory 2 is input to the pulse motor 37. Then, the pulse motor 37, the input and controls the rotation of the lens rotating shaft 4, 4 on the basis of, rotating the radius vector angle of theta _i only lens rotating shaft 4, 4 and the lens L.

On the other hand, the radial length ρ _i is input from the memory 2 to the pulse motor 32 of the measuring device 3. Then, the pulse motor 32 drives the support base 31 based on this input,
33 and 34 are positioned at the position of the radial length ρ _i .

The detection amounts fZ _i and bZ _i of the encoders 35 and 36 are input to the arithmetic unit 5 and subjected to arithmetic processing described later.

An input device (input means) 6 and a display device (display means) 7 are connected to the arithmetic device (calculation means) 5. The input device 6 and the display device 7 are integrally mounted on the operation panel 8 as shown in FIG. 4, and the display device 7 is, for example, a graphic display device made of liquid crystal.

Next, the operation of the above apparatus will be described with reference to the flowchart of FIG.

Step 10 The shape of the lens frame LF of the spectacle frame is measured, and the radial information (ρ _i , θ _i ) of the bevel locus is stored in the memory 2.

Step 11 As shown in FIG. 1, with the fillers 33 and 34 in contact with the front refracting surface and the rear refracting surface of the unprocessed lens, respectively, a pulse corresponding to the radial length ρ _i is transmitted from the memory 2. Pulse motor 32
By driving the pulse motor 32 by a predetermined number of pulses, the support base 31 is driven to move the fillers 33 and 34 to the position of the radial length ρ _i . On the other hand, the pulse motor 37
, A pulse corresponding to the radial angle θ _i is input from the memory 2, and the pulse motor 37 is driven by a predetermined number of pulses to rotate the lens rotating shafts 4 and 4 and the lens L. The movement amounts of the fillers 33 and 34 at this time are detected by the encoders 35 and 36, and the detected values fZ _i and bZ _i by the encoders 35 and 36 are detected.
Is input to the arithmetic unit 5. The arithmetic unit 5 calculates the edge thickness Δ _i
= Seek fZ _i -bZ _i.

[0022] Step 12 arithmetic device 5, of the edge thickness delta _i, the maximum edge thickness delta _max (=
fZ _a −bZ _a ) and the radius (ρ _a , θ _a ) and the minimum edge thickness Δ _min
(= FZ _b -bZ _b) the radius vector with the (ρ _b, θ _b) choose.

The edge dividing ratio stipulated step 13 up to edge (maximum edge thickness delta _max) in advance m: eZ a bevel apex position of dividing by n _a, the minimum edge (minimum edge thickness delta _min) the edge dividing ratio p: When the bevel apex position divided by q and eZ _b, eZ _a and eZ _b
A combination of the maximum edge thickness delta _max and the minimum edge thickness delta _min is Is required. next, Solve obtains the curvature radius eR bevel curved y _c. Curve value Ce of the bevel curved y _c is (Where n is the refractive index of the lens L). these
The calculations of the equations (1) to (3) are executed by the arithmetic unit 5.

Step 14 The arithmetic unit 5 Since the angle γ and the depth V of the V-groove of the bevel grinding wheel of the ball grinding machine for obtaining the curvature radius fR of the front refraction surface Lf of the lens L from the formula are known, the curvature radius fR of the front refraction surface Lf and the curvature radius fR of the bevel curved surface are known. From the radius of curvature eR and the depth V, the position kZ _{a of} the edge k _a and the position kZ _{b of the} edge k _b of the front refractive index are determined. And
The maximum bevel vertex distance s and the minimum bevel vertex distance t Ask for.

Step 15 The display device 7 digitally displays the bevel curve values Ce and the bevel apex distances s and t obtained in the above steps, and also schematically shows the cross-sectional shapes 71 and 72 of the bevel as shown in FIG. I do.

Step 16 The operator measures the bevel apex distance s digitally displayed on the display device 7 and the maximum frame thickness W ₁ (see FIG. 7) of the lens frame of the spectacle frame, and determines the half of the value as the lens value. the maximum distance from the frame front to the V-groove bottom of the bevel groove of the rim (maximum bevel distance of the frame), but actually measured in advance the maximum bevel distance D ₁ of the frame. Similarly measure the minimum frame thickness W _2, the value of half the minimum bevel distance of the frame, but in fact the minimum bevel distance D ₂
Is measured.

The maximum bevel distance D _{1 of the} frame is compared with the maximum bevel distance s of the lens. If both are different, the “S” button 61 of the input device 6 shown in FIG. Press the "I" button 64 if you do not want to increase s, press the "D" button 65 if you do not want to decrease the display s value, and press the "SET" button 66 when you are done.

[0028] Similarly by comparing the minimum bevel distance t of the minimum bevel distance D ₂ and the lens frame, after ON of the "t" button 62 when changing to the same operation.

Step 17 The arithmetic unit 5 determines the changed bevel vertex position eZ _a ′, eZ
_{From b} ´ as in equation (2) Is calculated, and a radius of curvature eR ′ of a new beveled surface is obtained.
Similar to equation (3) A newer bevel curve value Ce 'is calculated and displayed on the display device 7. Instead of directly changing the bevel distances s and t, the curve value Ce may be changed. This step is 21
~ 23.

Step 21 The "C" button 63 of the input device 6 is turned on, and the "I" button 64 or the "D" button 65 is operated to change the curve value Ce.

Step 22 The arithmetic unit 5 calculates the bevel curvature radius eR 'from the changed curve value Ce'. And obtain new bevel vertex positions eZ _a ′ and eZ _b ′
In relation (2) , And new bevel distances s ′ and t ′ are calculated as in equation (5). Ask from.

Step 23 The new s 'and t' are displayed on the display device 7. The curve value Ce is changed until the changed bevel distances s ′ and t ′ of the lens satisfy the bevel distances D ₁ and D ₂ of the frame or become very close values.

[0033] Incidentally, bevel length of the lens s', instead of digitally displaying the t', as shown in FIG. 5, the cross-sectional shape 71 and the minimum edge thickness of the bevel at the maximum edge thickness delta _max delta _min
The scales 73 and 74 and the indexes 75 and 76 may be displayed as an image together with the bevel cross-sectional shape 72 in.

Further, here, as it is clear from FIG. 5, only the maximum edge thickness delta _max and the minimum edge thickness delta _min, i.e. the bevel at the maximum edge thickness delta _max in cross section 71 and the minimum edge thickness delta _{m in} only bevel sectional shape 72, although the display image with the scale 73 and the index 75, 76, likewise the display device also in edge thickness delta That edge thickness delta _i in any meridian (display means) 5 can be displayed on the display device 7. That is, the edge thickness Δ at any meridian
An image can also be displayed for the beveled shape.

[0035]

As described above, the present invention relates to a lens shape display device for displaying an expected shape of a processed spectacle lens based on information on a target lens shape of a spectacle frame and information on an edge thickness of a spectacle lens. The eyeglass processing company is a beginner because it has a calculation means for calculating a bevel apex position for dividing the thickness at a desired ratio, and a display means for displaying a scale on a bevel shape formed after processing. Also, the front of the lens frame can be made to match the edge of the front side of the lens (to make it look good). Position can be specifically grasped.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a ball mill according to the present invention.

FIG. 2 is a flowchart showing the operation of the ball mill according to the present invention.

FIG. 3 is a schematic diagram for explaining the principle of the present invention.

FIG. 4 is a plan view illustrating an example of an input device and a display device.

FIG. 5 is an explanatory diagram showing another example of the display example of the display device.

FIG. 6 is an explanatory diagram showing a relationship between a lens frame and its radial information.

FIG. 7 is a schematic diagram illustrating a relationship between a bevel distance of a lens framed in a lens frame and a bevel apex distance of the frame.

FIG. 8 is an explanatory diagram showing an example of a conventional bevel cross-sectional shape.

[Explanation of symbols]

 1… Frame shape measuring device 3… Lens refraction surface position measuring device 5… Computing device (computing means) 6… Input device 7… Display device (display means)

Continued on the front page (72) Inventor Shigeki Kuwano 75-1, Hasunuma-cho, Itabashi-ku, Tokyo Topcon Co., Ltd. (72) Inventor Shinji 75-1 Hasunuma-cho, Itabashi-ku, Tokyo Topcon Co., Ltd. (72 Inventor Takahiro Watanabe 75-1 Hasunumacho, Itabashi-ku, Tokyo Inside Topcon Co., Ltd.

Claims (1)

[Claims] 1. A lens shape display device for displaying an expected shape of a processed spectacle lens based on eye shape information of an eyeglass frame and edge information of an eyeglass lens, wherein a bevel vertex dividing the edge thickness at a desired ratio. A lens shape display device comprising: a calculating means for obtaining a position; and a display means for displaying a scaled bevel shape formed after processing.