JPH02190245A - Lens decentering position setting method for lens grinding machine and its device - Google Patents

Abstract

PURPOSE:To obtain an amount of narrowing accurately in a simple manner so that it can be set by measuring the form of a lens frame, and thereby obtaining information on decentering at the time of processing a lens to be framed in based on the measured information. CONSTITUTION:The form of a lens frame LE is measured by a frame form measuring device 1, information on its radius vector (rhoL, thetaL) is stored in a memory 2, the height H' from the lowermost point PU of the lens frame LF to a geometric center Og and the horizontal distance D' to the geometric center Og are obtained by an operation control circuit 3, then, the value PD of a distance frame between the geometric centers of a right and a left lens frame, the value HPD of the pupilary distance at one side of an user and the view point height Hf are inputted into the operation control circuit 3. The operation control circuit 3 sets up a new origin based on these inputs so that co-ordinate transformation is performed from information on a radius vector (rhoi, thetai) to information on a radius vector (rhoi', thetai') making the new origin their own origin in order to be inputted into the memory 2 so that it is thereby stored. A lens L is ground by a grinder 7 based on the transformed information on a radius vector (rhoL', thetaL').

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention is directed to setting the lens eccentricity position of a grinding machine used for eccentrically grinding eyeglass lenses in order to fit the lenses into the lens frames of eyeglass frames. The present invention relates to a method and an apparatus thereof. More specifically, the present invention relates to a method of setting the eccentric position of a lens so that the geometric center of the lens frame and the viewpoint of the lens have a desired amount of eccentricity, and a device therefor.

(Prior Art) As shown in FIG. 7, when the lens L is fitted into the lens frame LP of the eyeglass frame F, the geometrical center Og of the lens frame LF and the distance viewpoint FVP of the eye E of the wearer of the glasses are generally do not match and are missing. This shift is caused by the fact that the frame PD (distance between the geometric centers of the left and right lens frames) of the lens frame (frame frame) LF does not match the PD (pupil volume ratio M) of the eyeglass wearer. Furthermore, the deviations between the geometrical center Og and the distance viewpoint FVP include deviations in the medial and lateral directions (horizontal direction) and vertical deviations of the eyeglass frame F.

Therefore, the optical center O1 of the lens L is the distance viewing point FV.
In order to fit the lens L into the lens frame LP so as to match P, the lens L is ground so that the optical center Ot is shifted from the geometric center Og, which is called "inward (outward) shifting" and "
It is necessary to perform a process called ``upward (downward) shifting''.

Furthermore, in a bifocal lens, an EX lens, or a progressive multifocal lens, the positional relationship of the near vision NVP with respect to the wearer's eye is important.

For this reason, conventionally, in order to accurately determine the amount of inward displacement and the amount of upward displacement, first attach a transparent adhesive tape TP to the frame F as shown in Figure 8, and then The point M t corresponding to MVP, N- is attached with adhesive tape TP
Next, insert the template T into the lens frame LP of this frame F as shown in FIG.
Distance viewpoint mark M from the center of the hole M for mounting to the ball-sliding machine formed in ! Measure the inner approach 1iFT and the upper approach fiFV up to the scale. Near perspective mark M,
Similarly, the inward shift fiNI and the upward shift amount NV (9th
In the example shown in the figure, the negative value (ie, the lower position) is measured. Then, using a device known as a centering device,
As shown in Figure 1O, the optical center O of the lens is located at the inner position and upper position measured using the scale plate SC.
r or the top t of the small bead segment S is positioned, and the suction cup W is suctioned to the lens L so that the center is at 0° from the center of the scale SC. After this, a suction cup W is attached to the lens shaft of the lens grinder to which the template T is attached, and the lens on the suction cup W is traced and ground with the template T, so that the optical center of the lens L is 0? comes to match the distance viewpoint FVP.

When grinding a lens with a grinding machine that uses a template T in this way, the amount of intrusion is determined based on the center OT of the template T.
You can know the amount of top-up.

For example, the present applicant previously proposed in Japanese Patent Application No. 80-115079 that instead of using a template, the shape of the lens frame LP of the frame F was measured digitally using a mechatronic method, and the lens was manufactured based on the lens frame measurement data. We proposed a so-called direct grinding machine for grinding.

(Problems to be Solved by the Invention) Incidentally, in the case of eccentric machining using the above-mentioned template-type drilling machine, complicated operations such as marking on the adhesive tape, measuring the distance from the center of the template to the mark, and aligning the center of the template are required. Not only that, but the center Ov of the hole in the template T cannot necessarily be accurately specified, so the offset amount Fl, FV, 81. New York's measurements are bound to be inaccurate.

In addition, with the direct taking method, although it is possible to calculate the geometric center of the lens frame from the measurement data of the lens frame, there is no means to physically indicate the center, so as shown in Figure 8. Even if we get marks M t , M +1,
Amount of gathering F1. It is not possible to measure FV, Nl, and NV, and there is no way to specify them, so there is a drawback that accurate eccentric machining cannot be performed.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a method for setting the eccentric position of a lens for a beading machine and a device therefor, which eliminates the conventional drawbacks and allows easy operation and accurate determination and setting of the offset amount. The purpose is

Another object of the present invention is to provide a method for setting the eccentric position of a lens for a ball slot machine, which allows accurate eccentric position setting even in a direct-picking type ball slot machine, and a device therefor.

(Means for Solving the Problems) Based on this object, in the lens eccentric position setting method of the lens rim of the eyeglass frame of the present invention, when the eyeglass frame is worn from a desired position of the lens frame of the eyeglass frame, The distance to Silver's viewpoint is input into the calculation means.

Moreover, the desired position is the lowest end position of the lens frame, and the viewpoint is a near vision viewpoint.

Further, the lens eccentric position setting device of the eyeglass frame has input means for inputting into the calculation means the distance from the desired position of the lens frame of the eyeglass frame to the viewpoint of the eye to be worn when the eyeglass frame is worn. It is characterized by

Also in this device, the desired position is the lowest position of the lens frame, and the viewpoint is a near vision viewpoint.

Further, in another method for setting the eccentric position of a lens for a lens rimming machine, the steps include the step of measuring the shape of a lens frame of an eyeglass frame, the PD value of the eyeglass frame, the half PD value of the eye of the wearer wearing the eyeglass frame, and the step of measuring the shape of the lens frame of the eyeglass frame. The present invention is characterized by the step of determining eccentricity information during processing of a lens to be fitted into the lens frame from distance information from a desired position of the lens frame to the viewpoint of the wearing eye.

Further, the lens eccentric position setting device of another eyeglass frame includes a frame shape measuring means for measuring the shape of a lens frame of an eyeglass frame, a PD value of the eyeglass frame, and a half PD of the eye of a wearer wearing the eyeglass frame. value.

an input means for inputting distance information from a desired position of the lens frame to a viewpoint of the wearing eye; and a calculation means for determining eccentricity information during processing of a lens to be fitted into the lens frame from the input information. It is characterized by having the following.

(Example) Hereinafter, this invention will be explained based on FIGS. 1 to 6.

FIG. 1 is a block diagram showing an eccentric processing device for a ball-sliding machine according to the present invention, and 1 is a frame shape measuring device. This frame shape measuring device 1 determines the shape of the lens frame of an eyeglass frame using radial information in polar coordinate format (/i', 9b) [i=
1.2.3. . . . N] is mechatronically measured digitally and stored in the memory 2. The structure and operation of this frame shape measuring device are similar to those detailed in Japanese Patent Application No. 60-287491 filed by the present applicant.

The memory 2 is connected to an arithmetic control circuit 3 (arithmetic means) so that data can be mutually transmitted. This calculation control circuit 3
is connected to an input device 4 (input means), a memory 5, and a display device 6, which will be described later, as well as a grinding bag j17 via the memory 2. This grinding device 7 is a direct grinding machine having the same structure and operation as the grinding device disclosed in Japanese Patent Application No. 115079/1988 previously filed by the present applicant.

Next, the operation of this device will be explained based on the flowchart in FIG.

Step 10 As shown in Figure 3, have the wearer wear the eyeglass frame F, and in the case of a normal distance glasses prescription, measure the wearer's distance unilateral pupillary distance +ttHPD (half Pt+) using a well-known PD meter. Next, measure the lowest point p of the lens frame LP.
The distance H1 from t+ to the far viewpoint FVP is scaled SL
Measure using.

In the case of bifocal lenses or EX lenses, measure the near unilateral pupillary distance M) IPD, l, and also measure the near vision MV.
As a guide for P, from the lowest point PU to the lowest point Pυ of the wearing eye E
The distance MHn to MHn is measured using the scale SL.

Step 11 Measure the shape of the lens frame LF using the frame shape measuring device 1, and store the radius vector information (λ, et) in the memory 2.

Step 12 Lens frame shape measured in Step 11 (/i?, 8c
) at the time of measurement is arbitrary, as shown in FIG. 3, and does not necessarily coincide with the geometric center Og of the lens frame.

Therefore, from the radial information (sword, θ-), calculate the maximum value h 1max of each of h +, h H,
Knowing h 1maX, find the height of the geometric center Og of the lens frame, that is, the height π from the lowest point PU to the geometric center Og.

Similarly, calculate dk+d, each maximum value dbmax, d
Knowing zmaX, find the horizontal distance ■ of the geometric center Og of the lens frame.

These calculations (1) to (4) are executed by the control circuit 3.

Step 13: The height π determined by equation (2) is digitally displayed on the height display section 64 of the display device 6 of the operation panel 40 shown in FIG.

Steps 14 to 16 Press the rPPDJ button on the human power device 40 to set the standard value 1 of the FPD of the eyeglass frame, that is, the frame PD (the distance between the geometric centers of the left and right lens frames) stored in advance in the memory 5.
For example, 64 mm is input to the calculation control circuit 3 and digitally displayed on the frame PD display section 61 of the display device 6 as shown in FIG. Frame PD displayed on this display section 61
If the actual eyeglass frame PD value is larger than the value,
υP" button to match the frame PD display value on the display section 61 with the actual frame PD of the eyeglass frame, and
Press the 5ETJ button to send the frame PD to the arithmetic control circuit 3.
Enter the value. On the other hand, the displayed frame pHl(t[
When the frame PD value of the actual eyeglass frame is smaller, press the rDOWNJ button to make the displayed value on the display section 81 match it, and then press the rsETJ button to input the frame PD value to the arithmetic control circuit 3.

Steps 17 to 19 Press the r) IPDJ button on the human power device 4 to display the one-sided pupillary distance value HPD (half P) stored in advance in the memory 5.
The standard value 1 of D), for example 32 mm, is input to the arithmetic and control circuit 3 and is displayed on the HPD display section 63 of the display device 6. If eccentric processing is to be performed based on the near viewpoint NvP, press the "Near" button on the input device 4 to input the standard value of the one-sided near pupillary distance value from the input device 5 to the arithmetic control circuit 3. (along with this) is displayed on the IPD display section 63. When this "near" button is pressed, the pilot lamp 44a lights up.

The one-sided pupillary distance value H displayed on this display unit 63
If the wearer's unilateral pupillary distance measured in step 10 is large relative to the PD, press the υPJ button, and press the unilateral pupillary distance value displayed on the display unit 63). If the wearer's interpupillary distance on one side is small, press the rDOWNJ button to measure) IPD
Match the value and press the r3ETJ button to measure) IP
The D value is input to the arithmetic control circuit 3.

Step 20 The height ■ to the geometric center Og of the lens frame displayed on the "height" display section 64 of the display device 4 and the desired viewpoint height H+ (or H,) measured in step 10 are calculated. Have them compare. As a result of this comparison, if the two are different, press the "H" button on the input device 4, then press the rtlPJ button 4.
5 or rDOWNJ button 46 to change the height display to the H+ (or Hl) value, and press the "rSET" button to set this viewpoint height to H+ (or Hl).

) is input to the arithmetic control circuit 3 and the operations in steps 17 to 19 described above, the origin of a new lens frame shape is input corresponding to the far perspective FVP or the near perspective MVP.

For example, as shown in FIG. 5A, the new origin MVP is offset by α in the vertical direction and β in the horizontal direction with respect to the geometric center Og of the lens frame.

Here, there is a relationship α=Hr (or Ha)−'Fr β=−HPD (or) IPDIl). Further, α corresponds to the "top-up amount", and β corresponds to the "r-filling amount". That is, in the present invention, the arithmetic control circuit 3
calculates the geometric center Og of the lens frame from the radial information (/e, 9) indicating the shape of the lens frame measured at an arbitrary origin 0-, gives it the horizontal distance ■ and the height π, and calculates this The geometric center Og is used as the reference position for shifting the origin during eccentric machining.

Then, the arithmetic control circuit 3 calculates the desired viewpoint height Hz (or HLl) input in step 20 and steps 14 to 3.
Frame PD at 19 and unilateral interpupillary pressure 11[)IPD
In addition to using the input of , a new origin is created using the above equation (5).

For example, set IIVP.

Step 21 As shown in FIG. 5A, in step 11, select the arbitrary origin 0-
Radial information of the lens frame shape (/i', fib
) is changed to radial vector information (R', θL') whose origin is the new origin set in the previous step 20, that is, the far viewpoint FVP. Distance perspective N
When VP is set, radial information with this as the origin (
The coordinates are changed to 8~, θ,') and input into the memory 2 and stored.

Step 22 The grinding device 7 grinds the lens L based on the changed radial information (/i'', [lL') or Cfe-θ-~).
to grind.

At this time, as shown in FIG. 5B, if the lens L to be processed is a single focal point, the center of the suction cup W is
It is adsorbed so that it coincides with the optical center OL. Further, when the lens L is a bifocal lens, the lens is attracted to the suction cup so that the center of the suction cup W coincides with the top t of the small bead segment.

In addition, as shown in FIG. 5B, the top t of the small ball segment S
Since the deviation 1t (a, b) between the distance optical center oT and the distance optical center oT is known, in step 19 the near unilateral pupil volume ratio IMHP is calculated.
D, when inputting the horizontal deviation fia, and when inputting the far viewpoint height H7 in step 20, if inputting the vertical deviation ff1b, the suction cup W may be attracted so that its center coincides with the distance optical center Or.

In addition, as shown by the broken line in Fig. 2, in addition to inputting the viewpoint height H+ (H-) by changing the height ■ in step 20, the height Hz (Ho) is directly inputted and displayed. Step 31. 32 may be used.

(Effects of the Invention) As explained above, according to the present invention, the user of the eyelid machine measures the desired viewpoint height HtC or H7) with the scale SL, and measures the unilateral pupil of the wearing eye, which is the data on the prescription. By inputting the distance 11PD (or) IPD, ) and the frame FPD written on the eyeglass frame, the eccentric position during lens processing can be automatically determined, making it possible to easily and accurately set the eccentric position. It is possible to provide a novel and useful eccentric position setting method for a ball-sliding machine and a device therefor.

Further, according to the present invention, it is possible to provide a novel method and apparatus for accurately setting the eccentric position even in a direct-picking type drilling machine.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a ball-sliding machine including an eccentric position setting device according to the present invention. FIG. 2 is a flowchart illustrating the operation of the apparatus shown in FIG. FIG. 3 is a schematic diagram for explaining the positional relationship between the viewpoint of the wearer's eye and the lens frame of the eyeglass frame. FIG. 4 is a schematic diagram for explaining a method for determining the geometric center Og of the lens frame from (R2O,). FIG. 5A is a schematic diagram showing the relationship between the geometric center of the lens frame and the eccentrically set processing origin. FIG. 5B is a schematic diagram showing the suction position of the suction cup to the lens. FIG. 6 shows the layout tn of a panel including a display device and an input device.
FIG. 2 is a plan view showing an example of an i-formation. FIG. 7 is a schematic diagram showing the relationship between the viewpoint when wearing the frame containing the lens and the wearing eye. FIG. 8 is a schematic diagram illustrating a conventional viewpoint marking method. FIG. 9 is a schematic diagram illustrating a conventional method of determining the offset amount from the viewpoint mark and the center of the template. FIG. 10 is an explanatory diagram for explaining a conventional centering method. 1... Frame shape measuring device 3... Arithmetic control circuit (calculating means) 4... Input bag fil (input means) 6... Display device 7... Grinding device

Claims (8)

[Claims] (1) A method for setting an eccentric position for a beading machine, which comprises inputting into a calculation means the distance from a desired position of a lens frame of a spectacle frame to a viewpoint of the eye to be worn when the spectacle frame is worn. . (2) The method for setting the eccentric position of a lens in a ball-sliding machine according to claim 1, wherein the desired position is a lowermost position of the lens frame. (3) The method for setting the eccentric position of a lens for a ball-sliding machine according to claim 1 or 2, wherein the viewpoint is a near vision viewpoint. (4) Lens eccentricity of a lens-sliding machine characterized by having an input means for inputting a distance from a desired position of a lens frame of a spectacle frame to a viewpoint of the eye to be worn when the spectacle frame is worn into a calculation means. Positioning device. (5) The lens decentering position setting device for a ball-sliding machine according to claim 4, wherein the desired position is a lowermost position of the lens frame. (6) The lens decentering position setting device for a ball-sliding machine according to claim 4 or 5, wherein the viewpoint is a near vision viewpoint. (7) Measuring the shape of the lens frame of the eyeglass frame, the PD value of the eyeglass frame, the half PD value of the eye of the wearer wearing the eyeglass frame, and the viewpoint of the eye wearing the eyeglass from a desired position of the lens frame. 1. A method for setting a lens eccentric position for a lens polishing machine, the method comprising the step of determining eccentricity information during processing of a lens to be fitted into the lens frame from distance information to the lens frame. (8) a frame shape measuring means for measuring the shape of a lens frame of an eyeglass frame; a PD value of the eyeglass frame, a half PD value of the eye of a wearer who wears the eyeglass frame, and the measurement of the eyeglass frame from a desired position of the eyeglass frame; A beading machine characterized by having an input means for inputting distance information to the viewpoint of the eye, and an arithmetic means for calculating eccentricity information during processing of a lens to be fitted into the lens frame from the input information. Lens eccentric position setting device.