JPH0822496B2 - Lens processing method and apparatus therefor - Google Patents

Description

The present invention relates to a lens processing method for grinding a lens to be processed (textile lens) into the shape of a lens frame of an eyeglass frame into which the lens is to be processed, and lens processing therefor. Regarding the device.

(Prior Art) Conventionally, the shape of a lens frame of an eyeglass frame into which a lens to be processed is placed or the shape of a template copied from the shape, that is, radial information is mechanically-electrically automatically measured as digital data. However, a method and apparatus for automatically grinding the lens to be processed based on the radius vector information are described in detail, for example, in Japanese Patent Application No. 60-115079 filed previously by the present applicant.

In this conventional technique, the distance between the geometric centers of both lens frames of the spectacle frame, that is, the frame PD value and the interpupillary distance of the spectacle wearer (hereinafter simply referred to as PD) can be input. Inset amount when the lens shown in the figure is framed
IN is automatically calculated, and the radius information ( _f ρ _i , _f θ _i ) of the lens frame that is the origin of the geometrical center OGR of the lens frame is moved to the origin based on the inset amount IN above. _l ρ _i , _l θ
_i ) is calculated, and the lens to be processed is automatically ground based on this lens processing radius. As a result, when the processed lens is framed in the lens frame of the spectacle frame, its optical center
The OLR and OLL can be processed so as to coincide with the optical centers of the pupils PR and PL of the wearer's eye.

(Problems to be Solved by the Invention) By the way, the spectacle frame is made of acetate, acrylic,
In the case of a so-called cell frame made of plastic such as nylon, epoxy resin or propionate, if the lens is ground to the same size as the measured lens frame and framed, the cell frame's holding power is weak and framed. It may cause looseness or detachment of the lens.

For this reason, as shown in FIG. 2, a normal working person uses an empirical correction amount C (correction value for the diameter of the normal lens frame) for the radial length _l ρ _i of the lens processing moving radius ( _l ρ _i , _l θ _i ). Lens processing radius ( _l ρ _i ′, _l θ _i ), which is the sum of C / 2
While obtaining E ', the cell frame is softened by heat and the lens R
The frame E'is placed and the lens RE'is held by the cooling contraction force of the frame.

Therefore, as shown in FIGS. 3A and 3B, the lens frame of the spectacle frame after the lens frame has been expanded and deformed by the correction amount C, but the bridge portion B is not deformed. After all, the lens frames RF and LF spread laterally (horizontally) around the bridge portion B, and the frame PD value FPD is FP
Change to D ′. The optical centers OLR and OLL of the lens after the lens frame is also shifted by Δ = correction amount C respectively OLR ′ and O
It has moved to LL ′ and the optical center of the left and right lenses is OLR ′, OL
The distance between L ′, that is, the PD of the glasses is 2 with respect to the PD of the wearer's eye.
Since Δ = 2C is increased, it does not coincide with the optical centers of the pupils PR and PL of the wearer's eyes, and there is a drawback that spectacles that are optically incomplete are provided.

An object of the present invention is to provide a lens processing method and a lens processing apparatus therefor capable of solving the above-mentioned conventional drawbacks.

(Means for Solving the Problem) A first configuration of the present invention for solving the above-mentioned problem is to obtain 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. Measuring step, a step of inputting frame PD data of the spectacle frame and PD data of the wearer's eye, a step of specifying a predetermined processing correction value according to the material of the spectacle frame, and the shape data , The frame PD
It is a lens processing method including a step of obtaining processing data from data, the PD data and the processing correction value, and a step of grinding the lens to be processed with the processing data.

A second configuration of the present invention for solving the above-mentioned problems is a shape data input unit for inputting shape data of a lens frame of an eyeglass frame in which a lens to be processed is framed or a template stamped from the lens frame, Eyeglass frame PD
Means for inputting data and PD data of the wearer's eye,
Frame material input means for inputting material information of the spectacle frame, correction value storage means for storing a predetermined processing correction value corresponding to the material, and the correction value storage means based on the input material information. A lens processing apparatus having a processing correction value called from the processing data, the shape data, and a calculation unit that obtains processing data from the frame PD data and the PD data.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

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

The construction and operation of the grinding section K and the lens frame shape measuring section FR are the same as those of the lens processing apparatus described in the above-mentioned Japanese Patent Application No. 60-115079.

The carriage 1 of the grinding portion K has a lens rotation shaft 2, 2 that holds and rotates the lens L to be processed. One end of one lens rotation shaft 2 is fixed to a disk 5 and abuts against a stopper 12. It is configured to be possible. The stopper 12 is moved up and down by a pulse motor 22. The shafts 10, 10 of the carriage 1 are pivotally supported by bearings 11, 11, and the axial distance between the lens rotation shaft 2 and the grindstones 13, 14 is changed by the vertical movement of the stopper 12. The lens rotation shafts 2,2 are rotated by a pulse motor 23 via pulleys 3,3, belts 4,4, pulleys 7,7, a drive shaft 6, and gears 9,8.
The grindstone is composed of a rough grinding grindstone 13 and a V-groove grindstone 14, and both are coaxially rotated at a high speed by a motor 21.

The lens frame shape measuring unit FR is movably supported on the rail of the rotating arm 31 which is rotated by the pulse motor 41 by the pulse from the pulse generator 108, and is constantly rotated by the spring 35.
Has a feeler support 33 that is pulled outward from the rotation axis of the spectacle frame F.
It has a feeler 34 that comes into contact with the peripheral surface of a template (not shown) that has been profiled from the F, LF bevel grooves or the lens frame.

The movement amount of the feeler 34 is detected by the encoder 40 and is input to the frame data memory 103 of the electrical component D as the radial length _f ρ _i , and the same pulse as that supplied from the pulse generator 108 to the pulse motor 41 rotates the rotating arm 31. Angle, that is, the radial angle _f θ _i is input to the frame data memory 103, and the radial data ( _f ρ _i , _f θ) of the lens frame (or template) is input.
_i ) is stored.

The lens frame shape measuring unit FR may be configured integrally with the lens processing device or may be configured separately from the lens processing device and electrically connected to each other, instead of the lens processing device and the lens frame shape. Enter the lens frame shape data measured by the measuring device into a floppy disk or IC card once,
The lens processing device may be configured to be provided with a reading device that reads data from these storage media, or may be configured to be able to input lens frame shape data to the lens processing device online from an eyeglass frame maker.

The arithmetic control circuit 102 of the electrical equipment section D is the above-mentioned grinding section K.
Drive controller 101 for driving and controlling the pulse motors 22 and 23 and the motor 21, and the frame data memory 1
03, frame PD value FPD and wearer interpupillary distance value PD
FPD / PD input device 106 for inputting, a frame material input device 107 for inputting that the spectacle frame is a cell frame, and a correction that stores a correction value C predetermined according to the material of the frame The value memory 105 and the processing data memory 104 for storing processing data (P _i , Θ _i ) for processing the lens L are connected.

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

 The operation of the lens processing device having the above configuration will be described below.

First, the lens frame shape measuring unit FR is operated to measure the shape of the right eye lens frame RF or the template of the spectacle frame F, and the lens frame (or template) radial data ( _f ρ _i , _f θ _i ) (here Then, i = 1, 2, 3, ... N) is obtained and stored in the frame data memory 103.

If the spectacle frame F is a cell frame,
The frame material input device 107 inputs the fact to the arithmetic and control circuit 102.

Further, the processor inputs the frame PD value FPD and the interpupillary distance value PD of the wearer to the arithmetic control circuit 102 using the FPD / PD input device 106. The arithmetic control circuit 102 receives the input frame PD value F
From the PD, the interpupillary distance value PD, and the correction value C stored in the correction value memory 105, the corrected inset amount IN that allows for the deviation of the optical center OLR of the right eye lens due to the deformation of the spectacle frame after the lens frame is placed. ′ For each sampling point Q _i of the lens frame (or template) radial data ( _f ρ _i , _f θ _i ) having the origin at the geometric center of the lens frame RF stored in the frame data memory 103, The radial data is converted into x-y coordinates to obtain x _i = _f ρ _i · cos _f θ _i y _i = _f ρ _i · sin _f θ _i ………… (2), and this x-coordinate value is calculated. Machining data (P _i , Θ _i ) based on a new origin by moving in the x-axis direction (horizontal direction) by the corrected inset amount IN '(where i = 1,2,3, ... N). To And stored in the processed data memory 104.

Here, the correction value C is 0.3 to 0.5 mm when the spectacle frame F is a general material such as acetate, acrylic, nylon or propionate, and 0.8 to 1.0 mm when the spectacle frame F is a material having high thermoplasticity such as epoxy resin. Is selected. In order to support 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 1
Multiple correction values C corresponding to each frame material input in 05
Should be memorized.

When the processing data (P _i , Θ _i ) is stored in the processing data memory 104, the arithmetic and control circuit 102 then controls the drive controller 101 to drive the grindstone motor 21 to drive the grindstones 13 and 14.
To rotate. The drive controller 101 is a processing data memory from the pulse generator 108 under the control of the arithmetic control circuit 102.
A pulse is supplied to the pulse motors 22 and 23 corresponding to the machining data (P _i , Θ _i ) stored in 104. This allows
The lens rotation axis 2 is rotated by the machining radius angle Θ _i , and the stopper 12
When the lens RL is ground by the grindstone 13 up to the machining radius P _i , the disk 5 contacts the stopper 12 and is moved to a position where it is not ground any more.

This operation is executed for all processing data (P _i , Θ _i ), and the lens RL is roughly ground based on the processing data and the lens frame is processed.
Grind to a shape similar to RF.

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

The optical center OLR of the lens RL has a lens rotation axis of 2,2.
The lens rotation axes 2 and 2 are chucked so as to coincide with the rotation axis of the lens.

The left eye lens LL also performs the same operation as above.

As a result, even if the lenses RF and LF are slightly ground to correspond to the cell frame, the optical centers of the lenses RF and LF framed in the frame are the optical centers of the eyes of the wearer when wearing the glasses ( It can be framed correctly so that it coincides with the center of the pupil.

(Effect) As described above, according to the present invention, the shape data of the lens frame of the spectacle frame in which the lens to be processed is framed or the template molded from it, the frame PD data, and the PD of the wearer's eye. The processing data is obtained based on the data and the predetermined processing correction value according to the material of the spectacle frame, and the lens is ground using this processing data. However, the optical center of each lens in the frame is the optical center of the wearer's eye (pupil center) when wearing the glasses.
Can be framed correctly to match.

[Brief description of drawings]

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 lens processing shape when the cell frame is supported, and the difference in each moving radius, and FIG. Schematic diagram showing the relationship between the frame PD of the cell frame and the PD of the wearer's eye, FIG. 3B is a frame deformation when the lens is framed in the cell frame, and the accompanying movement change of the optical center of the frame PD and the lens, and It is a schematic diagram which shows the difference of the amount of inset and processing data of a prior art and this invention. F: Glasses frame, RF: Right eye lens frame, LF ... Left eye lens frame, RL ... Right eye lens, LL ... Left eye lens, L ... Lens, D ... Electrical component, FR ... Lens frame shape measuring unit, K ... Grinding unit, 22, 23 ... Pulse motor, 101 ... Drive controller, 102 ... Arithmetic control circuit, 103 ... Frame data memory, 104 ... Machining data memory, 105 ... … Correction value memory, 106 …… FPD / PD input device, 107 …… Frame material input device, 108 …… Pulse generator.

Claims (2)

[Claims] 1. A step of measuring shape data of a lens frame of a spectacle frame in which a lens to be processed is framed or a template molded from the lens frame, and frame PD data of the spectacle frame and a wearer's eye
Inputting PD data, identifying a predetermined processing correction value according to the material of the spectacle frame, processing from the shape data, the frame PD data, the PD data and the processing correction value A lens processing method comprising: a step of obtaining data; and a step of grinding the lens to be processed with the processing data. 2. Shape data input means for inputting shape data of a lens frame of a spectacle frame in which a lens to be processed is framed or a template molded from the spectacle frame, and frame PD data of the spectacle frame and the eyes of the wearer. A means for inputting PD data, a frame material input means for inputting material information of the spectacle frame, a correction value storage means for storing a predetermined processing correction value according to the material, the input material The machining correction value called from the correction value storage means based on information, and the shape data,
A lens processing apparatus, comprising: the frame PD data and a computing unit that obtains processing data from the PD data.