JPH1029145A - Lens shape display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To graphically display a lens edge shape at the time of shifting so as to easily predict a shape obtained after machining by providing an arithmetic means for calculating a lens edge vertex position based on edge thickness information and a display means for displaying a lens edge shape after the lens edge vertex position is moved by a specified amount. SOLUTION: By pressing the start button of an input device 6 while filler 33 and 34 are in contact with the front and rear refraction surfaces of a non- machined lens L, measuring of positions corresponding to the moving diameter lengths of the front and rear bent surfaces Lf and Lb is started. An arithmetic device 5 calculates the rear end position of the front refraction surface Lf and a lens edge vertex distance between maximum and minimum edges, and a display 7 digitally displays a lens edge curve value and the lens edge vertex distance and typically displays the sectional shape of the lens edge. Then, for changing the sectional shape of the lens edge by changing the position of an optional moving diameter ρi , by pressing a display mode switching button, a ρi button and an I button, the display of the lens edge sectional shape on the display 7 is changed to a shape positioned in the moving diameter ρi .

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 In general, a V-shaped bevel groove for mounting a lens is formed on an entire inner peripheral surface of an eyeglass frame (eyeglass frame). For this reason, a bevel (V-shaped protrusion) needs to be formed on the peripheral surface of the lens attached to the spectacle frame.

[0003] By the way, depending on the position where the bevel is formed, when the lens is mounted on the spectacle frame, the amount of protrusion of the side surface of the lens toward the front of the spectacle frame is increased, and the appearance may be impaired.

Therefore, in the conventional ball mill, it is necessary to select an appropriate bevel position in the thickness direction of the lens according to the shape of the lens frame of the spectacle frame and the shape of the lens to be processed.
For this reason, there is a display in which the bevel shape is displayed before the lens grinding, and the position condition of the bevel is set while observing the bevel shape.

[0005]

However, in such a ball mill, it is not possible to display and confirm an expected shape of a position where a bevel is formed before machining, and therefore, it is difficult to use the same as a lens frame of an eyeglass frame. Depending on the position of the edge of a large lens shape, the amount of projection of the spectacle frame from the front side of the lens frame often increases, and there is a possibility that spectacles with poor appearance may be produced.

Accordingly, the present invention graphically displays a bevel shape when a vertex position of a bevel shape to be formed on the edge of a spectacle lens is shifted toward a front side or a rear side by a desired amount. An object of the present invention is to provide a lens shape display device capable of easily grasping an expected shape after processing.

[0007]

In order to achieve this object, a lens shape display device according to the present invention calculates an expected shape of a spectacle lens after processing based on eye shape information of a spectacle frame and edge thickness information of a spectacle lens. In the lens shape display device for displaying, it is configured to have a calculating means for obtaining a bevel apex position from the edge thickness information and a display means for graphically displaying a bevel shape after moving the bevel apex position by a predetermined amount. Is what you do.

[0008]

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

FIG. 1 is a block diagram showing a bevel shape display system of a lens shape display device according to the present invention.

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 device 1 calculates the shape of the lens frame LF of the spectacle frame, more precisely, the bevel groove trajectory, as shown in FIG. 9, 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 base 31 approaching and moving away from the lens L by driving the pulse motor 32, a front refraction surface and a rear refraction surface of the lens L disposed on the support base 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 lens rotating shafts 4 of a carriage (not shown), and the lens rotating shafts 4 are provided so as to be rotatable 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 moving radius 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 an arithmetic unit (arithmetic means) 5 and are subjected to arithmetic processing described later.

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

The lens shape data obtained by the arithmetic unit 5 is inputted to and stored in the memory m1 or the memory m2.

Next, the operation of the above device will be described with reference to the flowcharts of FIGS. 2, 3, 4, and 5.

FIGS. 2 and 3 show the right eye lens data processing, and FIGS. 4 and 5 show the left eye lens data processing.

[I] Right-eye lens bevel data processing Step 10 (measurement of frame shape) Right lens frame LF of the spectacle frame (FIG. 1)
0) is measured by the frame shape measuring device 1, and then the frame geometric center distance “FPD”, the wearer's pupil distance “PD”, and the geometric center of the frame, which are input by input means (not shown). The radial information (ρ _i , θ _i ) of the bevel trajectory centered on the position supported by each value of the vertical displacement “UP” between the pupil and the center of the pupil is stored in the memory 2. Since the left and right lens frames of the spectacle frame have the same shape and the same size, the radial information (ρ _i , θ _i ) of the bevel trajectory of the right lens frame LF is used for data processing of the left lens shape.

Step 11 (Measurement of unprocessed lens for right eye, calculation of edge thickness) As shown in FIG. 1, a filler is provided on the front refracting surface and the rear refracting surface of the unprocessed lens L.
With the 33 and 34 in contact with each other, the input device 6 in FIG.
When the start button ST is pressed after the right eye selection button R is pressed, the position measurement corresponding to the radial length ρ _i of the front refractive surface Lf and the rear refractive surface Lb of the right eye lens is started.

As a result, a pulse corresponding to the radial length ρ _i is input from the memory 2 to the pulse motor 32 and the pulse motor 32 is driven by a predetermined number of pulses.
To move the fillers 33 and 34 to the position of the radial length ρ _i .

On the other hand, a pulse corresponding to the moving radius angle θ _i is input from the memory 2 to the pulse motor 37 and the pulse motor 37 is driven by a predetermined number of pulses, so that the lens rotating shafts 4 and 4 and the lens L are moved. rotate θ _i .

The amount of movement of the fillers 33, 34 in the Z direction at this time is detected by the encoders 35, 36, and the encoders 35, 36
The detected values fZ _i and bZ _i are input to the arithmetic unit 5.

The arithmetic unit 5 calculates the edge thickness Δ _i = fZ _i −b
Find Z _i .

Step 12 (selection of maximum edge thickness and minimum edge thickness (see FIG. 6))
, Of the edge thickness delta _i, the maximum edge thickness Δ _max (= fZ _a -b
Radial radius (ρ _a , θ _a ) having Z _a ) and minimum edge thickness Δ _min (= fZ _b
Select a radius (ρ _b , θ _b ) having −bZ _b ).

[0027] Incidentally, where, fZ _a Z-direction position of the front refractive surface Lf in the radial [rho _a, bZ _a Z-direction position of the rear-side surface L _b in the radial [rho _a, fZ _b is the radius vector [rho _b in the Z direction of the front refracting surface Lf at _b , and bZ _{b at} the rear refracting surface at the radius p _b
This is the position of _{Lb in} the Z direction.

Step 13 (Calculation of bevel apex position and curve value) In forming a bevel groove (V-shaped groove) of a beveled grindstone on the periphery of this lens, the size of the bevel groove The shape is known in advance.

The ratio of the distance in the case of forming a bevel on the lens periphery with edge thickness delta _i in such beveling grindstone, until the rear edge end from the distance and the bevel vertex distance from the front edge end to bevel apex Is set to m: n.

[0030] Here, the bevel apex position in the maximum edge thickness delta _max and eZ _a, when the bevel apex position at the minimum edge thickness delta _min and the eZ _b, the bevel apex position eZ _a, e
Z _b is Ask from. Next, eR ² = ρ _a ² + (eZ ₀ −eZ _a ) ² ... (3) eR ² = ρ _b ² + (eZ ₀ −eZ _b ) ^2. By solving, the radii of curvature eZ ₀ and eR of the beveled curved surface y _c are obtained.

Here, since the left sides of equations (3) and (4) are the same, from equation (3) = (4), ρ _a ² + (eZ ₀ −eZ _a ) ² = ρ _b ² + ( eZ ₀ -eZ _b) ^2, and the solving for eZ _0, eZ _{0 is, 2eZ 0 (eZ a -eZ b} ) = ρ a 2 -ρ b 2 + eZ a 2 -eZ b 2 Required from.

The curve value Ce of the beveled surface y _c is (Where n is the refractive index of the lens L). these
The calculations of the equations (1) to (6) are executed by the arithmetic unit 5.

[0033] Step 14 arithmetic device _{^{5, fR 2 = ρ a 2}} + (fZ 0 -fZ a) 2 .................. (7) fR 2 = ρ b 2 + (fZ 0 -fZ b) 2 ... Since the angle γ and the depth V of the V-groove of the beveled grinding wheel of the lens shape display device for obtaining the radius of curvature fR of the front refractive surface Lf of the lens L from equation (8) are known, the front refractive surface Radius of curvature f of Lf
From the curvature radius eR of the bevel curved surface and the depth V, the position kZ _{a of} the edge k and the position kZ _{b of the} edge k _{b of the} front refracting surface Lf.
Ask for. Then, the bevel apex distance s of the maximum edge and the bevel apex distance t of the minimum edge are represented by s = eZ _a −kZ _a ... (9) t = eZ _b −kZ _b. ……… (10)

Further, similarly as ki the edge end of the front refractive surface Lf at an arbitrary radius vector .rho.i, the position in the edge end ki and kZ _i, the bevel apex position at any radius vector .rho.i e
Let Z be the bevel vertex distance from the edge ki to the bevel vertex position eZ _i , and bevel vertex position eZi is eR ² = ρ _i ² + (eZ ₀ −eZ _i ) ² ... (11) Than

(Equation 1) It is obtained from equation (12).

After the curve value Ce of the beveled curved surface yc is determined as described above, the bevel apex position at an arbitrary radius ρ _i may be calculated based on the Ce value.

Step 15 (Display) The display device 7 digitally displays the bevel curve values Ce and the bevel vertex distances s and t obtained in the above steps, and also schematically shows the cross-sectional shapes 71, 72 and 76 of the bevel. 7
Display as shown. Here, the cross-sectional shape 71 indicates the bevel shape at the maximum edge thickness, the cross-sectional shape 72 indicates the bevel shape at the minimum edge thickness, and the cross-sectional shape 76 indicates the edge thickness at the middle between the maximum edge thickness and the minimum edge thickness (intermediate edge thickness). ) Shows the bevel shape.

Changing the bevel distances s and t Step 16 In this step, the display displayed on the display device 7 is
1, a display mode switching button 67 (see FIG. 7) for switching, a “ρ _i ” button 82 for moving a pointer line H indicating a moving radius ρ _i, and a “mode for changing a bevel vertex distance”. "t" button 62, "s" button 61, "I" button 6
4. Press “D” 65 etc. to change the screen display or data.

Here, the operator measures the bevel apex distance s digitally displayed on the display device 7 and the maximum frame thickness W ₁ of the lens frame of the spectacle frame (see FIG. 10), and determines a half value thereof. the maximum distance from the lens 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, although the value of half the minimum bevel distance of the frame, is measured in advance the minimum bevel distance D2 in practice.

[0039] After turning ON the "S" button 61 of the input device 6 shown in FIG. 7 When comparing the maximum bevel distance s of the maximum bevel distance D ₁ and the lens of the frame, both if it differs from the display value To increase s, press the "I" button 64. To decrease the display value s, press the "D" button 65.

[0040] 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.

The amount of increase or decrease of such display values s and t (shift amount)
After the "position" displayed on the display unit of the display device 7,
It is displayed as a numerical value such as "± 0 ....".

That is, the shift amount represented by this numerical value is obtained by calculating the bevel apex position calculated by using the edge division ratio of m: n, that is, the bevel apex at the bevel distance s, t from the front refraction surface. When the bevel position at this time is set to “0”, it indicates how far from this position the vertex of the actual machining is located.

Further, by changing the position of an arbitrary radius ρi,
When changing the bevel cross-sectional shape at the change position, the display mode switching button 67 is pressed to display the display shown in FIG. 12, and then the "I" button 61 or the "D" button 64 after pressing the "ρi" button 82. Press.

After pressing the "ρ _i " button 82, the "I"
When the button 61 is pressed, the pointer line H indicating the moving radius ρ _i rotates clockwise to change the position. On the other hand, "[rho _i" press "D" button 64 after pressing the button 82, guidance line H shown the radius vector [rho _i changes the position rotated counterclockwise. Accordingly, the display of the bevel cross-sectional shape 76 of ρ _i displayed on the display device 7 is also changed to a shape located at the moving radius ρ _i .

Step 16-1 In this step, the display values s, changed in step 16
t, the position of the pointer line H, the bevel shape 76, and the like are displayed, and the flow shifts to step 16-2.

That is, when the display mode switching button 67 is pressed in step 16, the lens peripheral shape, lens curved shape, and curve value are set in this step 16-1 as shown in FIG.
(Curve 5.0 in the figure) and the shift amount (position +0.3 in the figure) from the bevel vertex position set by m: n are displayed.

Further, when the display mode switching button 67 is further pressed in step 16, the lens peripheral shape, as shown in FIG.
Lens bevel cross-sectional shape, curve value (curve 5.0 in the figure)
Also, the shift amount from the bevel apex position set at m: n (position +0.3 in the figure), the position of the maximum edge thickness, the position of the minimum edge thickness, and the like are displayed.

It should be noted that the bevel apex position obtained in step 14, that is, “the bevel apex position set by m: n and obtained by calculation” is changed immediately after shifting from step 14 to step 15. Absent. Therefore, step
Immediately after shifting from step 14 to step 15, the shift amount of the bevel apex position is “0” and “position + 0.
"3" indicates "position 0".

Step 16-2 In this step 16-2, it is determined whether or not the "SET" button 66 has been pressed. If it has not been pressed, the process returns to step 16 with "NO". , The operation of changing the bevel shape 76 ”can be continued.

If the "SET" button 66 has been pressed and the answer is YES, the process proceeds to step 17.

Step 17 The arithmetic unit 5 determines the changed bevel vertex position eZ _a ′, eZ
'ER' (2) similarly to the equation ^{_{2 = ρ a 2 + (eZ}} 0 -eZ a' b) 2 ...... (3) 'eR' 2 = ρ b 2 + (eZ 0 -eZ b') 2 …… (4) ′ is calculated to obtain a radius of curvature eR ′ of a new beveled surface,
Similar to equation (3) A new bevel curve value Ce 'is calculated, and step 18 is executed.
Move to

Step 18 In this step, the curve value calculated in step 17 is displayed on the display device 7, and the process proceeds to step 19.

Step 19 In this step 19, it is determined whether or not the memory button 70 has been pressed and turned on. If the memory button 70 has not been turned on, the flow returns to step 16 to return to "display values s, t, pointer H, bevel shape 76". Change operation "can be continued.

If it is ON, the process proceeds to step 20.

Step 20 In this step, information such as the lens data and lens shape data obtained in steps 10 to 19 is stored in the memory m1.
And the right-eye lens bevel information display process ends.

[Change of bevel distances s, t by curve value] Instead of directly changing the bevel distances s, t as described above, the curve value Ce may be changed. This step is 21 to 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 21-1 In this step, the changed value input in step 21 is displayed on the display device 7, and the process proceeds to step 21-2.

Step 21-2 In this step, it is determined whether the "SET" button 66 has been pressed. If the "SET" button 66 has not been pressed, the determination is NO, and the process returns to step 21 to loop, and the input change of the numerical value is continued. If the “SET” button 66 has been pressed, the process proceeds to step 22.

Step 22 The arithmetic unit 5 calculates the bevel radius of curvature eR 'from the changed curve value Ce'. And obtain new bevel vertex positions eZ _a ′ and eZ _b ′
(2) the eR' ² = ρ _a ² + relationship ^{_{(eZ 0 -eZ a ') 2}} ... (3)'eR' 2 = ρ b 2 + (eZ 0 -eZ b ') 2 ... (4)' , And new bevel distances s ′ and t ′ are calculated in the same manner as in equation (5) by using s ′ = eZ _a ′ −kZ _a ... (9) ′ t ′ = eZ _b ′ − kZ _b ………………… (10) ′

Step 23 The new s 'and t' are displayed on the display device 7, and
Move to

The curve value Ce is changed until the bevel distances s 'and t' of the lens thus changed satisfy the bevel distances D ₁ and D ₂ of the frame or become very close values.

Instead of digitally displaying the bevel distances s 'and t' of the lens, scales 73 and 7 are used as shown in FIG.
4,77 and indexes 75,76,78 may be displayed as images. Furthermore, here it has been displayed only in edge thickness delta _max, delta _min, can also be displayed in edge thickness delta in any meridian.

Step 24 In this step, it is determined whether or not the memory button 70 has been pressed. If the memory button 70 has not been pressed, the process returns to step 21 with NO and loops to continue the data change input.

If the button has been pressed, the process proceeds to step 25.

Step 25 In this step, the bevel distances s 'and t' of the lens changed as described above are stored in the memory m1.

[II] Left-eye lens bevel data processing Step 100 In this step, since the left and right lens frames of the spectacle frame have the same shape, the memory m obtained in Step 1 of [I] is used.
The radial information (ρ _i , θ _i ) of the bevel trajectory stored in 1 is used. Therefore, in this left-eye lens data processing, the operation of measuring the radial information (ρ _i , θ _i ) of the bevel trajectory is omitted, and the bevel radial information (ρ _i , θ _i ) is converted to the left eye. Then, the process proceeds to step 110.

Step 110 (measurement of unprocessed lens for left eye, calculation of edge thickness) As shown in FIG. 1, filler 3 is provided on the front refracting surface and the rear refracting surface of the unprocessed lens.
With the left and right buttons 3 and 34 in contact with each other,
Press the start button ST after pressing. Thus, the radius vector length ρ of the front refractive surface L _f and the rear-side surface L _b of the left eye lens
_The position measurement corresponding to _i is started. Then, in the same manner as the edge thickness of the right-eye lens operation (step 11), bevel radius vector information ([rho _i, theta _i) together determine the edge thickness delta _i in the maximum edge thickness Δ _max (= fZ _a -bZ _a radius vector ([rho _a with), θ _a) the minimum edge thickness and _{Δ min (= fZ b -bZ b} ) radial with ([rho _b,
θ _b ) is selected, and the routine goes to step 120.

Step 120 Also in this step, the bevel apex position and curve value of the left eye lens are calculated in the same manner as in the calculation of “bevel vertex position and curve value calculation” of the right eye lens in step 13. Move to 1.

Step 120-1 In this step, it is determined whether or not the “P” button 81 (selection means) for using the right lens data measured and calculated previously is pressed.

If the "P" button 81 has been pressed, the process proceeds to step 120-3. If the "P" button has not been pressed, the process proceeds to step 120-2.

Step 120-2 In this step, it is determined whether or not the start button ST has been pressed to perform the bevel curve calculation processing.
If the start button ST has been pressed, steps 130 and 140
Is performed in the same manner as in Steps 13 and 14, and the bevel curve Ce of the left lens and the bevel vertex distances s and t are obtained.
Move to step 150.

Step 120-3 In this step, the right lens data obtained and stored in [I] is called from the memory m1, and this right lens data is converted into left lens data.
Move to 0.

At this time, the bevel apex position of the left eye lens is
It is obtained on the basis of the “bevel vertex distances s, t” and the shift amount indicated by “position ± 0...” Obtained by the previous calculation.

Here, the bevel vertex distances s and t are distances from the lens front refracting surface Lf when the maximum edge thickness and the minimum edge thickness of the lens are divided by m: n. In addition, the shift amount is obtained by calculating the bevel apex position calculated by using the edge division ratio of m: n, that is, the bevel position when the bevel apex is positioned at the bevel distances s and t from the front refraction surface. When "0" is set, it indicates how far from this position the bevel vertex of the actual processing is located.

Therefore, assuming that the shift amount of the bevel apex position to the front and rear of the lens is Δa (a minus amount on the front side and a plus amount on the back side), the bevel apex distance from the front refraction surface at the maximum edge thickness of the left eye lens is sL. Assuming that the bevel vertex distance from the front refraction surface at the minimum edge thickness is tL, the bevel vertex distances sL and tL used for actual processing of the left eye lens are sL = s + Δa = eZ _a −kZ _a + Δa (13) obtained by the calculation as _{tL = t + Δa = eZ b} -kZ b + Δa ... (14).

The bevel vertex positions eZ _a and eZ _b of the left eye lens at the bevel vertex distances s L and t L are eZ _a = sL + kZ _a −Δa (15) eZ _b = tL + kZ _b −Δa (16) ).

Step 150 In step 150, the lens data including the bevel curve obtained in step 140, or step 120-3
The lens data obtained from the previous data in the display device 7
Will be displayed.

The data includes the bevel curve value Ce of the left lens, the bevel apex distances s and t, and the cross-sectional shapes 71, 72, and 76 of the bevel, as in step 15.

Step 160 In this step, the display displayed on the display device 7 is shown in FIG.
3, a display mode switching button 67 for switching as shown in FIG. 14, a “ρ _i ” button 82 for moving the pointer line H indicating the moving radius ρ _i , a “t” button 62 for changing the bevel apex distance, "S" button 61, "I" button 64,
Press "D" 65 or the like to change the screen display or change the data. This operation is the same as the operation in the previous step 16.

Step 160-1 In this step, the display values s and t of the left eye lens, the position of the pointer H, the bevel shape 76, etc., changed in step 160 are displayed on the display device 7 simultaneously with the previous right eye data. The display is shifted to step 16-2.

That is, when the display mode switching button 67 is pressed in step 160, as shown in FIG. 13, the right eye lens data (the figure data is partially broken) as shown in FIG.
Is displayed on the left half of the display screen of the display device 7. on the other hand,
Data such as the lens peripheral shape of the left eye lens, the lens curved shape, the curve value (curve 5.0 in the figure), and the shift amount (position +0.3 in the figure) from the bevel apex position set by m: n are displayed on the display device 7. It is displayed on the right half of the display.

Further, when the display mode switching button 67 is pressed at step 160, as shown in FIG. 14, the data (graphic data such as the lens peripheral shape, the lens bevel sectional shape, the curve value, etc.) of the right eye lens previously obtained are obtained. Is displayed in the left half of the display screen of the display device 7. On the other hand, data such as the lens peripheral shape of the left eye lens, the lens bevel cross-sectional shape, the curve value (curve 5.0 in the figure), and the shift amount (position +0.3 in the figure) from the bevel apex position set by m: n are displayed on the display device. It is displayed on the right half of the display section of 7.

The display of the "position" of the shift amount of the bevel position of the left eye lens is the same as the previous time, and only the data of the left eye lens is changed by the button operation in step 160.

Steps 160-2 to 250 In the processing of steps 160-2 to 250, the changed data is stored in the memory m2 in step 200 or 250. The other processing is the same as the processing in steps 16-2 to 25, and thus the description thereof is omitted.

After these steps are completed, the left eye lens is beveled based on the lens data stored in the memory m2.

[0087]

According to the present invention, it is possible to graphically display the expected bevel shape when the vertex position of the bevel shape which will be formed on the edge of the eyeglass lens is shifted by a desired amount to the front or rear surface of the lens. Since it is possible, the expected shape after processing can be easily grasped, and there is an effect that the eyeglasses after framing can be processed with good appearance.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a lens shape display device according to the present invention.

FIG. 2 is a flowchart showing an operation of the lens shape display device according to the present invention.

FIG. 3 is a flowchart showing an operation of the lens shape display device according to the present invention.

FIG. 4 is a flowchart showing an operation of the lens shape display device according to the present invention.

FIG. 5 is a flowchart showing an operation of the lens shape display device according to the present invention.

FIG. 6 is a schematic diagram for explaining the principle of the present invention.

FIG. 7 is a plan view illustrating an example of an input device and a display device.

FIG. 8 is an explanatory diagram showing another example of the display example of the display device.

FIG. 9 is an explanatory diagram showing a relationship between a lens frame and its radial information.

FIG. 10 is a schematic diagram showing a relationship between a bevel distance of a lens framed in a lens frame and a bevel apex distance of the frame.

FIG. 11 is an explanatory diagram showing an example of data and graphics displayed on the display device of FIG. 7;

FIG. 12 is an explanatory diagram showing an example of data and graphics displayed on the display device of FIG. 7;

FIG. 13 is an explanatory diagram showing an example of data and graphics displayed on the display device of FIG. 7;

FIG. 14 is an explanatory diagram showing an example of data and graphics displayed on the display device of FIG. 7;

[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)

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 thickness information of an eyeglass lens, a calculating means for obtaining a bevel apex position from the edge thickness information. And a display means for graphically displaying the bevel shape after the bevel apex position has been moved by a predetermined amount.