JPH03131459A - Lens working method and device thereof - Google Patents

Abstract

PURPOSE:To put a lens into a frame in the precise coincidence condition with the optical center of the lens to the center of a pupil by obtaining the form data of the lens frame of a spectacle frame, frame PD data, PD data of eye of a putting-on person, and working data based on a working correcting value previously decided according to frame material. CONSTITUTION:The lens frame RF of a spectacle frame F put in with a worked lens L or form data of a template copied from it is measured with a measuring part FR, and frame PD data of a spectacle frame and PD data of eye of a putting on person are input with an input device 106. Further, previously decided working correcting value according to the material of the spectacle frame F is specified. Nextly, working data are searched from form data, frame PD data, PD data, and a working correcting value with a computing control circuit 102, and the lens L to be worked is grinding worked with a grinding work part K.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a lens processing method for grinding a lens to be processed (fabric lens) into the shape of a lens frame of an eyeglass frame in which the lens is to be framed, and a lens processing method therefor. Regarding equipment.

(Prior art) Conventionally, the shape of the lens frame of the eyeglass frame in which the lens to be added is inserted, or the shape of the plate that has been added after copying it, that is, the radial information, has been automatically digitized by mechanical electrolytic erosion. A method and apparatus for automatically grinding a lens to be processed based on the 0 radius vector information is described in detail in, for example, Japanese Patent Application No. 115079/1989 filed by the applicant in the evening. ing.

In this conventional technology, it is possible to input the distance between the geometric centers of both eyeglass frames, that is, the frame PD value, and the interpupillary distance (hereinafter simply referred to as PD) of the eyeglass wearer, and it is possible to input the distance between the geometric centers of both lenses of the eyeglass frame. Automatically calculates the inset amount IN when inserting the lens into the frame shown in Figure 2, and calculates the geometric center OCR of the lens frame.
The lens frame diameter information (, ρ□, fθ,) whose origin is the lens processing radius (,ρ□, fθ,), which is moved to the origin based on the inset amount IN
, ρ11, θ1) and self-help grinding of the lens to be processed based on the lens processing vector radius. As a result, when the processed lens is inserted into the lens frame of the eyeglass frame,
The center of light OLR, OLL is the pupil PR, P of the wearer's eye.
It can be processed so that it coincides with the optical center of L.

(Problem to be Solved by the Invention) By the way, if the eyeglass frame is a so-called cell frame made of plastic such as acetate, acrylic, nylon, epoxy resin, or propionate, it may be the same size as the measured lens frame. When a lens is ground and placed in a frame, the holding power of the cell frame is weak, causing the lens in the frame to wobble or come off.

Therefore, as shown in Fig. 2, the machining operator usually sets the radial length of the lens machining radius (lρ11, θ,) to ρ1, which is half the empirical correction amount C (normal correction value for the diameter of the lens frame). 2
By processing with the lens machining radius (lρ, , lθ□) that is the sum of The lens RE- was held by the cooling shrinkage force of the frame.

Therefore, as shown in FIGS. 3A and 3B, the lens frame of the eyeglass frame after the lens frame is inserted is expanded and deformed by the above correction amount C, but the bridge portion B is not deformed. In the end, the lens frame is RF.

LF spreads left and right (horizontally) around bridge portion B, and its frame PD value FPD changes to FPD-. And the optical center of the lens after the lens frame is inserted OLR, OLL
Also Δ; deviation OLR by the amount of correction C, OL
The optical center of the left and right lenses is 0LROL.
The distance between L-, that is, the PD of the glasses increases by 2Δ=2C with respect to the PD of the wearer's eye, and the pupil P of the wearer's eye
This has the drawback that the silver mirrors do not coincide with the optical centers of R and PL, resulting in glasses that are optically incomplete.

SUMMARY OF THE INVENTION An object of the present invention is to provide a lens processing method and a lens processing apparatus for the same which can eliminate the conventional drawbacks.

(Means for Solving the Problems) A first configuration of the present invention for solving the above problems uses shape data of a lens frame of an eyeglass frame in which a lens to be processed is framed or a template molded from the lens frame. a step of measuring, a step of inputting frame PD data of the eyeglass frame and PD data of the wearer's eye, a step of specifying a predetermined processing correction value according to the material of the eyeglass frame, and a step of the shape data. , a lens processing method comprising the steps of: obtaining processing data from the frame PD data, the PD data, and the processing correction value; and grinding the lens to be processed using the processing data.

A second configuration of the present invention for solving the above problems includes a shape data input means for inputting shape data of a lens frame of a @mirror frame in which a lens to be processed is framed or a template molded from the lens frame; Frame PD of the eyeglass frame
means for inputting data and PD data of the wearer's eyes, frame material input means for inputting material information of the eyeglass frame, and correction value storage means for storing predetermined processing correction values according to the material. , a lens comprising: the processing correction value read from the correction value storage means based on the input material information; a calculation means for obtaining processing data from the shape data; the frame PD data and the PD data; It is a processing device.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

As shown in FIG. 1, the lens processing apparatus of the present invention is roughly composed of a grinding section, a lens frame shape measuring section FR, and an electrical equipment section.

The structure and operation of the grinding section and the lens frame shape measuring section PR are similar to the lens processing apparatus described in the above-mentioned Japanese Patent Application No. 115079/1982, and please refer to that application for details.

The carriage 1 in the grinding section has a lens rotation shaft 2.2 that holds and rotates the lens L to be processed, and a disk 5 is fixed to one end of the lens rotation shaft 2 and abuts against an abutment stop 12. configured to be possible. The stop 12 is a pulse motor 2
It is moved up and down by 2. The shaft 10.10 of the carriage 1 is pivotably supported in a bearing 11.11, and the shaft 10.10 of the carriage 1 is pivotally supported on a bearing 11.11, and
The distance between the axes of the grinding wheels 13 and 14 is changed by the vertical movement of the abutment stop 12. The lens rotation axis 2.2 is connected to pulleys 3, 3,
Belt 4, 4. Pulley 7.7, drive shaft 6, gear 9.8
It is rotated by a pulse motor 23 via. The grindstone consists of a rough grinding wheel 13 and a V-groove grindstone 14, both of which are coaxial and driven by a motor 2.
1 for high speed rotation.

The lens frame shape measuring unit FR includes a rotating arm 3 rotated by a pulse motor 41 using pulses from a pulse generator 108.
The feeler support 33 is movably supported on the rail of the eyeglass frame F and is constantly pulled by a spring 35 in the direction outside the rotation axis of the rotating arm 31.
It has a feeler 34 that comes into contact with the bevel grooves of the lens frames RF and LF or the peripheral surface of a template (not shown) that is copied from the lens frames.

The amount of movement of the feeler 34 is detected by the encoder 40 and stored as the radial length, ρ, in the frame data memory 10 of the electrical equipment section.
3 and from the pulse generator 108 to the pulse motor 4.
The same pulse supplied to the frame data memory 10 is used as the rotation angle of the rotating arm 31, that is, the radial angle, θ.
3, and the lens frame (or template) radius vector data (
fρl+fθ, ).

Note that instead of configuring the lens frame shape measurement unit FR integrally with the lens processing device or configuring it separately from the lens processing device and electrically connecting the two, the lens frame shape measurement unit FR can be configured separately from the lens processing device. The lens frame shape data measured by the measuring device may be input into a floppy disk or an IC card, and the lens processing device may be equipped with a reading device that reads the data from these storage media. The lens frame shape data may be configured to be input to the lens processing apparatus online.

The arithmetic control circuit 102 of the electrical equipment section includes a drive controller 101 that drives and controls the pulse motors 22 and 23 and the motor 21 in the grinding section, the frame data memory 103, and the frame PD@! FPD/FPD for inputting the FPD and the wearer's pupillary distance value PD
A PD input device 106, a frame material input device 107 for inputting that the eyeglass frame is a cell frame, a correction value memory 105 that stores a predetermined correction value C according to the material of the frame, and a lens L. A processing data memory 104 for storing processing data (Ps, el) for processing is connected.

The FPD/PD input device 106 may be a manual input device such as a numeric keypad, an online input from an optometry device, or a reading device from an optometry data storage means such as a floppy disk or an IC card. .

The operation of the lens processing apparatus having the above configuration will be explained below.

First, the lens frame shape measurement unit FR is operated to measure the shape of the right eye lens frame RF or template of the eyeglass frame F, and the lens frame (or template) radius vector data (fρ1 + fθ□) (
Here i=1.2.3. . . . N) is determined and stored in the frame data memory 103.

When the eyeglass frame F is a cell frame, the fabricator inputs this information to the arithmetic control circuit 10 using the frame material input device 107.
Enter 2.

Further, the processor inputs the frame PD value FPD and the wearer's pupillary distance value PD to the calculation control circuit 102 using the FPD/PD input device 106. The arithmetic control circuit 102 calculates the input frame PD (iiIFPD and interpupillary distance value P).
D and the correction value C stored in the correction value memory 105
From this, the corrected in-centering amount IN- that takes into account the shift of the optical center OLH of the right eye lens due to the deformation of the eyeglass frame after the lens frame is inserted is calculated as the geometry of the lens frame RF stored in the frame data memory 103. A lens frame with the origin at the center (
or template) For each sampling point Ql of the radial vector data (fρl + fθ1), the radial vector data is x-
Transform the y coordinate to obtain y1°tρ1''8jnro, move this X coordinate value to the above-mentioned correction inward amount IN-N - horizontal direction of the component force axis), and create machining data (Pl, el) based on the new origin. (Kokote i = 1, 2, 3...
・・・・・・・・・N) to P□= (xt+IN) + yt・
(3) This is obtained and stored in the processed data memory 104.

Here, the correction value C is 0.3 to 0.5 mm if the eyeglass frame F is made of common materials such as acetate, acrylic, nylon, or propionate, but 0 if it is made of a material rich in thermoplasticity such as epoxy resin. .8 to 1.0 rrr m is selected. In order to correspond to a plurality of types of cell frames in this way, the frame material input device 107 is provided with a plurality of input keys, and the correction value memory 105 is made to store a plurality of correction values C corresponding to each frame material input. Just leave it there.

After storing the processing data (P, θ□) in the processing data memory 104, the arithmetic control circuit 102 then controls the drive controller 101 to drive the grindstone motor 21 and rotate the grindstones 13 and 14. A drive controller 101 operates a pulse generator 1 under the control of an arithmetic control circuit 102.
The pulse motor 22 is activated in response to the machining data (PL, f9i) stored in the machining data memory 104 from 08
．． 23. As a result, the lens rotation axis 2 is rotated by the machining radial angle et, and the abutment stop 12 is rotated by the lens R.
When L has been ground by the grindstone 13 to the processing radius P1, the disk 5 abuts against the abutment stop 12 and is moved to a position where it is no longer ground.

This operation is executed for all of the processing data (PK, et), and the lens RL is roughly ground based on the processing data to have a similar shape to the lens frame RF.

When rough grinding is completed by the grindstone 13, the lens RL is moved by a known carriage moving means (not shown) and beveled by the grindstone 14.

Note that the lens RL is chucked to the lens rotation axis 2.2 such that its optical center OLR coincides with the rotation axis of the lens rotation axis 2.2.

The same operation as above is performed for the left eye lens LL as well.

As a result, even if the lenses RF and LF are ground to a larger size to accommodate the cell frame, the optical center of each lens RF and LF placed in the frame will be the same as the optical center of the wearer's eye when wearing the glasses. (Effect) As explained above, according to the present invention, the lens to be processed can be placed in the lens frame of the eyeglass frame in which the lens is to be framed or molded from it. Processing data is obtained based on the template shape data, frame PD data, wearer's eye PD data, and predetermined processing correction values according to the material of the eyeglass frame, and the lens is ground using this processing data. Therefore, even if the lenses are ground to a larger size to accommodate the cell frame, the optical center of each lens fitted in the frame will be aligned with the optical center of the wearer's eye (pupil center) when wearing the glasses. can be framed correctly.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of the present invention, Fig. 2 is a schematic diagram showing the difference in the size of the lens frame shape and the processed shape of the lens when compatible with cell frames, and the difference in the vector radius of each. Frame PD of the cell frame and P of the wearer's eye
A schematic diagram showing the relationship between D and Figure 3B shows the frame deformation when the lens is framed in the cell frame, the accompanying movement change of the frame PD and the optical center of the lens, and the amount of intrusion between the conventional technology and the present invention. Models showing differences in processing data F...Eyeglass frame, RF...Right eye lens frame, LF...Left eye lens frame, RL...Right eye lens, LL...Left eye lens, L... ...Lens, D...Electrical equipment section, FR...Lens frame shape measurement section, K...Grinding processing section, 22.23...Pulse motor, 101...Drive controller, 102...Calculation Control circuit, 103... Frame data memory, 104... Processing data memory, 105... Correction value memory, 106... FPD/PD input device, 107... Frame material input device, 108... pulse generator.

Claims (2)

[Claims] (1) Measuring shape data of a lens frame of an eyeglass frame in which the lens to be processed is inserted or a template molded from the lens frame; and Frame PD data of the eyeglass frame and PD data of the wearer's eye. a step of inputting, a step of specifying a predetermined processing correction value according to the material of the eyeglass frame, and a step of obtaining processing data from the shape data, the frame PD data, the PD data, and the processing correction value. A method for processing a lens, comprising: the step of: grinding the lens to be processed using the processing data. (2) Shape data input means for inputting shape data of a lens frame of an eyeglass frame in which the lens to be processed is inserted or a template molded from the lens frame, and frame PD data of the eyeglass frame and PD data of the wearer's eye. frame material input means for inputting material information of the eyeglass frame; correction value storage means for storing a predetermined processing correction value according to the material; the processing correction value called out from the correction value storage means based on the processing correction value, and the shape data;
A lens processing device comprising: arithmetic means for obtaining processing data from the frame PD data and the PD data.