JPH0541386B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a lens grinding device for grinding a raw eyeglass lens, in order to frame the eyeglass lens, that is, a lens to be processed, in a lens frame of an eyeglass frame.

Prior Art In order to fit a lens into the lens frame of an eyeglass frame, a template-type lens grinding device has been in practical use for grinding a fabric eyeglass lens using a template processed to imitate the shape of the lens frame as a reference. has been made into On the other hand, in order to eliminate the trouble of creating templates, in 1983, a direct lens grinding device was developed that directly digitally measures the lens frame of an eyeglass frame and grinds the fabric eyeglass lens based on the measured value. −
Proposed in No. 118460. Both types of lens grinding devices mentioned above have a bevel grindstone for so-called bevel processing, which forms a bevel on the peripheral edge of the lens in order to support the lens in the frame groove of the lens frame.

Problems to be Solved by the Invention There are two important points to keep in mind when processing the bevel: the position of the apex of the bevel within the edge thickness, and the bevel curve. Ideally, the bevel apex position should be formed at a position of 4:6 from the front side of the edge thickness of each radius vector in any lens radius, and include a bevel curve, that is, a bevel apex locus connecting the apexes. The purpose is to set the curve of the spherical surface to a predetermined bevel curve value that matches the lens frame of the eyeglass frame.

However, in reality, it is extremely difficult to perform processing to obtain such ideal bevel apex positions and bevel curves. This is because in the past, both the bevel apex position and the bevel curve had to rely on the operator's intuition and experience, and furthermore, it was impossible to know what kind of bevel would be formed on the lens to be processed until it was actually processed. This is because the.

Incidentally, bevel processing has become a process that requires special care, as errors in bevel processing can directly lead to the lens not being able to be framed, or the occurrence of burrs or cracks when fitting lenses or wearing glasses.

OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide a lens grinding device capable of knowing the shape of the bevel that will be formed in advance before lens processing. Our goal is to provide the following.

Structure of the Present Invention To achieve the above object, the present invention includes an edge thickness measuring means for measuring the edge thickness of a lens to be processed, and at least one of a bevel approach amount and a curve value to correct and set the bevel apex position. an input means for changeably inputting information; and a bevel position condition input by the input means, at least maximum and minimum edge thickness information obtained from the edge thickness measuring means, and the bevel shape of the bevel grinding wheel. Calculating means for calculating an expected lens bevel shape that will be obtained after bevel processing of the lens; Based on the calculation results of the calculating means, a chevron-shaped bevel portion and a hem portion extending below the bevel at least at the maximum and minimum edge thicknesses; and a display device for graphically displaying the expected lens bevel shape, which stores the bevel position conditions finally set by the input means and controls the bevel processing of the lens to be processed based on the stored bevel position conditions. This is a lens grinding device characterized by comprising a control section for driving the lens.

Effects of the Invention As will be understood from the examples described below, according to the lens grinding apparatus of the present invention, the bevel shape to be formed on the lens to be processed is displayed before the grinding process, so that the operator can This has the advantage that the bevel shape can be known in advance and the bevel apex position and bevel curve can be adjusted with reference to this display.

Embodiment Overall Structure of Apparatus FIG. 1 is a perspective view, partially cut away, showing the overall structure of a lens grinding apparatus according to the present invention. A frame shape measuring device 20, which will be described later, is installed in the lower part of the housing 1.
0 is built-in, and the front wall of the housing 1 has an opening 10 for putting in and taking out the frame holder.
is formed. A vertically swinging door 10a is attached below the opening. Furthermore, a keyboard 1000 and a display device 2000, which will be described later, are arranged vertically on the upper right side of the front wall surface.

In the whetstone chamber 30 of the housing 1, there are a rough whetstone 3a for glass lenses and a rough whetstone 3 for plastic lenses.
A grindstone 3 is fixed to the rotating shaft 31. The grindstone 3 includes a bevel grindstone 3b, and a flat precision grindstone 3d. The rotating shaft 31 is rotatably supported on the wall surface of the grindstone chamber 30, and a pulley 53 is attached to the end thereof. The pulley 53 connects to the AC via the belt 52.
It is connected to a pulley 51 attached to the rotating shaft of a grindstone rotating motor 5 consisting of a drive motor. With this configuration, when the motor 5 rotates, the grinding wheel 3
is rotated.

A shaft 11 is supported by a bearing 12 of the housing 1 so as to be slidable in the axial direction.
Rear arms 33a and 33b of the carriage 2 are rotatably supported on the rear arms 33a and 33b of the carriage 2. The front arms 34a, 34b of the carriage 2 have lens rotation shafts 28a,
28b is coaxially and rotatably supported.
The lens rotation shaft 28a on the right side in FIG. 1 has a lens chucking mechanism having a known configuration, and moves forward and backward in the axial direction by rotation of the chuck handle 29, and moves the lens LE to be processed along the rotation shaft 28a,
It can be held between 28b.

On the other hand, at the outer end of the left lens rotation shaft 28b, there is a disc 27a that comes into contact with an abutting device 42, which will be described later.
and a template holding part 27b for holding the template.

Each of the lens rotation axes 28a and 28b has a
Pulleys 26a and 26b are attached, and a drive shaft 25 having pulleys 23a and 23b at both ends is built into the carriage 2. A worm wheel 22 is attached to one end of the drive shaft 25, and a worm gear 21 is attached to the rotating shaft of a lens shaft rotating motor 21 consisting of a pulse motor.
It meshes with a. A timing belt 2 is installed between the pulleys 23a and 23b and the pulleys 26a and 26b.
4a and 24b are spanned. With these configurations, the rotation of the motor 21 is caused by the lens rotation axis 28a,
28b, and rotates the lens LE to be processed. On the other hand, the carriage 2 has a built-in lens measuring device 600, which will be described later.

The end of the shaft 1 is fitted onto an arm 40 of a frame 4 for moving a carriage. The frame is slidably supported by a shaft 41 attached to the housing 1, and a feed screw 61 is screwed into the frame. The feed screw 61 is fixed to the rotating shaft of a carriage moving motor 60 consisting of a pulse motor. With this configuration, when the motor 60 rotates,
The frame 4 is moved left and right, and the shaft 11
The carriage 2 is moved in the left and right direction via the.
The frame 4 also includes a stopper device 42, which will be described later.
and a grinding pressure control device 43 are attached. A pin 43 a implanted in the carriage 2 is brought into contact with the grinding force control device 43 .

Figure 2 shows the line of frame 4 in Figure 1.
FIG. The stopper device 42 is
It is generally composed of a stopper up/down motor 420 made of a pulse motor disposed on the lower surface of the frame 4, a support column 421, and a stopper member 422.
Feed screw 4 attached to the rotating shaft of motor 420
23 is screwed into the female threaded portion 424 of the support 421. Furthermore, a key 425 is implanted in the side surface of the support 421, and the key 425 is fitted into the key groove 44 formed in the frame 4. .

The table part 426 at the upper end of the support column 421 has
A photosensor unit 427 is attached to detect that the template is in contact with the abutting member 422. The abutting member 422 has a shaft 42 that is rotatably fitted into the end of the table portion 426.
8, it is attached to the table portion 426 so as to be rotatable about a shaft 428. A spring 47 is installed between the abutting member 422 and the table portion 426.
0 is interposed, and by the action of this spring 470, the abutting member 422 is always lifted upward as shown by the two-dot chain line.

A light shielding rod 429 is provided inside the abutting member 422.
is attached, and when the abutting member 422 is pressed down, it is located between the photosensor units 427 and acts to block the light running inside the units 427. Further, an eccentric cam 471 is attached inside the abutting member 422, and by rotating this, the distance between the cam surface and the table portion can be changed, and the stopping position of the abutting member 422 can be finely adjusted. An arcuate portion 422a having the same curvature as the rough grindstone 3a and a horizontal cut surface 422b are formed on the upper surface of the abutting member 422.

During grinding using a template, the template SP attached to the carriage 2 comes into contact with this arcuate portion 422a. Further, the horizontal cut surface 422b is brought into contact with the disk 27a when grinding is performed using the lens frame shape measurement data of the frame.

In this embodiment, the template is detected by abutting the template against the stopper member 422 as described above, but the present invention is not limited to this. For example, a method may be adopted in which the movement of the template, that is, the progress of lens processing, is checked based on the presence or absence of edges of the template between the photosensor units.

The grinding pressure control device 43 includes a pulse motor 432 having a feed screw 431, a piston 434 that is threadedly engaged with the feed screw 431 through a female threaded portion 433, and a cylinder 435 that is slidably inserted on the outer wall of the piston 434. and a spring 436 disposed between the cylinder 435 and the piston 434.

A key 437 is installed on the outside of the flange of the piston 434, and this key 437 is attached to the frame 4.
It is fitted into a key groove 45 formed in. The upper surface 435a of the cylinder 435 comes into contact with the side surface of a pin 43a attached to the carriage 2, and supports the weight of the carriage 2 by the elastic force of the spring 436. The feed screw 43 is rotated by the rotation of the motor 432.
By moving the piston 434 up and down via the spring 436, the amount of compression of the spring 436 changes, and the carriage 2
Since the amount of force supporting the lens LE changes, the grinding pressure applied to the grinding wheel 3 of the lens LE to be processed can be changed.

Lens Measuring Device The lens measuring device detects the radius vector, edge thickness, curve value, etc. of the lens to be processed built in the carriage 2. The lens measuring device is shown in Figures 3 and 4.
As shown in the figure, two parallel guide rails 602, 602 are provided on the base frame 601, and the movable table 60 is slidably mounted on the rails 602.
3 are arranged. A feed screw 604 is screwed into the moving table 603, and the feed screw 604 is driven by a lens radius sensor motor 605 consisting of a pulse motor.

A moving frame 610 is fixed to the upper surface of the moving table 603. Rear wall piece 6 of moving frame 610
11 and the moving table 603 are two parallel rails 6.
12 (only one is shown in Figure 4)
A suspension platform 613 is slidably mounted on this parallel rail 612. A constant torque spring member 614 is disposed between the suspension table 613 and the base frame 601, and acts to bring the suspension table 613 into contact with the rear surface of the movable table 603 at the initial stage. An arm 621 of a lens radius sensor 620 is fixed to the front side of the suspension table 613.

Cone-shaped flange 62 at the tip of the arm 621
2, a modified H-shaped hand arm 623 is attached to one end of the hand arm 623 so as to be rotatable about an axis _O3 , as shown in FIG. 5A. hand arm 623
At the other end, two oval pieces 624, 624 are rotatably supported around the rotation center _O1 .
A contact ring 625 having a circular cross section in contact with the axis O ₁ is rotatably attached between the two oval pieces 624 and 624 so that the axis O ₂ is the rotation axis. Due to the coincidence of the contact surface of the contact ring 625 with the axis O ₂ and the rotatability of the oval piece 624 around the axis O ₂ , the contact ring 625 is attached to the edge of the processing lens LE as shown in FIG. 5B. When abutting, the contact point P coincides with the lens vector radius l, which coincides with the axis A of the arm 621. Therefore, it is possible to eliminate the error Δ that occurs when, for example, the contact ring 625 is fixedly supported on the hand arm 623 without providing the oval piece 624 as shown by the two-dot chain line in the figure.

A spring 627 is hung between the central arm portion 626 of the hand arm 623 and the arm 621, and acts to constantly pull the hand arm 623 upward. Hand arm 623 is arm 62
The horizontal position is maintained by a stopper piece 628 formed at the tip of 1. This hand arm 623
The structure of the processed lens is as shown in Fig. 5C.
Contact ring 625 due to large cut in LE and chipping etc.
When the object falls into the cut oyster, the hand arm 623 and the contact ring 6 are rotated clockwise by the lens.
This is to prevent 25 from being damaged. That is, when a force exceeding the limit is applied to the hand arm 623, the hand arm 623 pivots about the axis _O3 against the tension of the spring 627. Axis O ₃
The axis B connecting the fixed point of the spring 627 and the spring 627
When the hand arm 623 crosses the lens LE, the hand arm 623 rapidly pivots under the tension of the spring 627 and retreats from the lens LE, thereby preventing itself from being damaged.

At the lower end of the suspension table 613, as shown in FIG.
is attached, and a scale 615b implanted in the base arm 601 is inserted. With this configuration, the amount of movement of the lens vector radius measuring member 620 is detected, and the processing lens LE vector radius ρ′ _i (i=
1, 2, 3, ..., N).

Next, the configuration of a lens surface shape sensor for determining the lens edge thickness and bevel curve value will be explained. As shown in FIG. 3, the movable frame 610 is provided with two parallel rails 630, 630, and movable stages 631, 632 and a frame stage 63 are slidably mounted on these rails 630, 630.
3,634 are installed. Moving stage 6
31 and free stage 633 are springs 635, 63
They are connected by 5. Similarly, the moving stage 632
and the free stage 634 are connected by springs 636, 636.

A feed screw 638 that is rotationally driven by a feeler motor 637 consisting of a pulse motor is screwed into the moving stages 631 and 632, and the screw directions of the feed screw 638 are opposite to each other with the center portion as a boundary. Since the rotation of the feed screw 638 moves the moving stages 631 and 632
move in opposite directions.

Pins 640, 640 are implanted in each of the moving stages 631, 632, and these pins are used to operate micro switches 641, 642 attached to the moving frame 610. That is, in FIG. 3, the pin 641 turns on the microswitch 641, and thereby it is detected that the movable stages 631 and 632 are located at the initial position, which is the maximum separation state.

When the feeler motor 637 is rotated and the distance between the moving stages 631 and 632 is narrowed, the pin 640 activates the micro switch 642.
It is detected that the minimum separation state has been reached, and the rotation of the feeler motor 637 is stopped based on this detection signal.

A feeler arm 650 is attached to the front end of the free stage 633, and its tip end is connected to the arm 620 of the lens radius sensor 620.
is stretched parallel to the axis A of the A feeler 651 is rotatably supported on a bent end portion of the feeler arm 650. The contact peripheral edge 651a of the feeler 651 coincides with the ridgeline of the contact ring 625, that is, the rotation axis _O1 of the oval piece 624. Similarly, a feeler arm 652 is attached to the front end of the free stage 634, and a feeler 653 is rotatably attached to the bent end of the feeler arm 652.

Detection heads 661a and 662a of magnetic encoders 661 and 662 are mounted on the central wall 660 of the moving frame 610, and their scales 661b and 662b are mounted on free stages 633 and 634, respectively. Thereby, the amount of movement of the free stage 633, that is, the amount of movement of the feelers 651, 653 can be detected.

As shown in FIG. 4, a push solenoid 671 is attached to the moving table 603. This solenoid 671 lens is connected to the hand arm 623 of the radius measuring device 620 and the feelers 651, 653.
When the two approaches to a predetermined distance in the radial direction, the magnet is excited and acts to separate the suspension table 613 in order to retract the hand arm 623.

In addition, the lens radial sensor 6 is attached to the carriage 2.
20 and an opening 680 for moving the feeler of the lens surface shape sensor toward the lens side. A shielding plate 681 is provided to prevent grinding water from entering the lens measuring device through the opening 680 during lens grinding.
The shielding plate 681 is attached to the O-ring 6 on the lens rotation shaft 28.
Ring 683 rotatably inserted through 82
installed on.

Lens rotation axis 2 to measure lens radius, etc.
8 in the direction of arrow 684, the ring 68
3 is the shielding plate 6 due to the frictional force of the O-ring 682.
81 is also rotated at the same time to unblock the opening 680, and when further rotated, the blocking plate 681 comes into contact with a protrusion 686 formed on the carriage 2 and is prevented from rotating further.

Thereafter, only the lens rotation shaft 28 rotates against the frictional force of the O-ring 682, and the lens LE can be rotated. Conversely, when the lens rotation shaft 28 is rotated in the direction of arrow 685 during lens grinding, the shielding plate 681 is simultaneously rotated and closes the opening 680 again, and comes into contact with the protrusion 687 formed on the carriage 2. Since subsequent rotation is prevented, the opening 680 is kept closed.

Electrical Control System The configuration of the electrical control system of this embodiment having the above-mentioned mechanical configuration will be explained based on the block diagram of FIG. Encoder 61 of lens radius sensor 620
5. Lens surface shape sensor encoder 661;
and 662 are counter circuits 820 and 82, respectively.
1,823. The output from each encoder is sent to a counter circuit 820, 82.
1,823, and the result is input to the arithmetic control circuit 810. Further, the photosensor unit 427 and microswitches 641, 642 and 244 are also connected to the arithmetic control circuit 810.

The feeler motor 637, lens radius sensor motor 605, lens rotation axis motor 21, carriage movement motor 60, stopper motor 420, and grinding pressure motor 432 are controlled by the motor controller 824.
It is connected. The motor controller 824 is
This is a device for receiving a control command from the arithmetic control circuit 810 and controlling how many pulses the pulse generator 809 outputs to which motor, that is, the number of rotations of each motor. Grinding wheel motor 5
is driven by an AC power source 826, and its rotation and stop are controlled by a switch circuit 825 controlled by commands from an arithmetic control circuit 810.

The arithmetic control circuit 810 is composed of, for example, a microprocessor, and its control is performed by a program memory 81.
It is controlled by a sequence program stored in 4. An input device 2000 and a display device 1000, which will be described later, are connected to the arithmetic control circuit 810. Further, the lens measurement data processed by the calculation control circuit 810 is stored in a lens data memory 827.
is transferred to and stored. The arithmetic control circuit 810 also controls the frame shape measuring device system 800.

The electrical system of the frame shape measuring device system 800 includes driver circuits 801 to 8 as shown in FIG.
04 are the X-axis motor 206 and Y-axis motor 2, respectively.
24, is connected to the sensor arm rotation motor 301 and the guide shaft rotation motor 209. The drivers 801 to 804 control the rotational drive of each of the pulse motors according to the number of pulses supplied from the pulse generator 809 under the control of the arithmetic control circuit 810.

The read output of the read head 313 is counted by a counter 805 and inputted to a comparison circuit 806, and the radial change range a from the reference value generation circuit 807 is calculated.
is compared with the amount of change in the signal corresponding to . When the count value is within the range a, the count value of the counter 805 and the number of pulses from the pulse generator 809 are converted into radius vector information (ρ _o , θ _o ) by the arithmetic control circuit 810 and stored in the lens frame data memory 811. is entered and stored here. From the radial change range a, the counter 805
When the amount of change in the output of is large, the arithmetic control circuit 8
10 receives a signal to that effect, excites the electromagnetic magnet 318 of the spring device 315 via the driver 808, prevents the feeler 356 from moving, and stops supplying pulses to the driver 804.
Stop rotation of motor 301.

Input device The input device of this embodiment is as shown in FIG.
It is composed of a seat switch, a main switch 2100, a function key 2200,
It has an input switch group 2303, two systems of start switches 2401 and 2402, and a stop switch 2500 for temporarily stopping driving.

The function key 2200 includes a pump switch 2201 for supplying only grinding water, a grindstone switch 2202 for rotating only the grindstone,
Handrail switch 2203 commands the supply of grinding water from the rotation of the grindstone for handrail processing, and either direct machining that measures the lens frame shape of the frame and processes based on this, or copying machining that uses a template. Processing type selection switch 2204 for selection, auto/manual selection switch 2205, and frame shape measurement device to select whether to measure the shape of the lens frame of only one eye of the frame or the shape of the lens frame of both eyes. Binocular-single eye selection switch 2
206, Selection switch 2207, Grinding for selecting whether to input PD and FPD or their relative amount (amount of shifting) when inputting the horizontal positional relationship between the pupil and the frame geometric center It consists of a pressure strength changeover switch 2208 and a selection switch 2209 for selecting whether to perform bevel processing or flat precision processing during template processing.

The input switch group 2303 consists of a numeric keypad input switch 2300, a switch 2301 for canceling input using the numeric keypad, and a storage switch 2302 for storing input. The operating states of these switches are indicated by the lighting of pilot lamps 2600 provided for each switch.

Display device As shown in FIG. 6, the display device 1000 displays the calculation results from the calculation control circuit 810 and the input device 2.
A controller 1400 converts input data from 000 into a signal for driving a liquid crystal display 1100, an X driver 1200 uses signals from the controller to drive rows X of a dot matrix liquid crystal element, and a driver 1200 drives columns Y. It is composed of a Y driver 1300 for

As shown in FIG. 9, the liquid crystal display 1100 includes a bevel curvature display 1111 that shows the curvature of the curved surface including the apex locus of the bevel, and a bevel shift display that shows how much the bevel apex locus is shifted from the standard position preset in the device. A display 1112 and a left/right lens identification display 1113 indicating whether the bevel to be beveled is for the right or left are displayed. The liquid crystal display 1100 further includes an automatic bevel shape display section 1110 for displaying the relationship between the bevel apex, maximum edge thickness, and minimum edge thickness calculated based on bevel position conditions set in advance in the device;
A manual bevel shape display section 1120 is provided to show the relationship between the bevel apex, maximum edge thickness, and minimum edge thickness calculated based on the amount of shift and curve value input manually.

Description of Operation of Apparatus Next, the operation of the above-mentioned lens grinding apparatus will be explained based on the flowchart shown in FIG.

Step 1-1: After turning on the switch step 2100, the processing type selection switch 2204 is used to select whether to directly measure the lens rim of the frame and process it directly, or to process it using a template.

Step 1-2: The operator decides whether the bevel position setting is automatic or manual, and if it is automatic, extend the selection switch 2205 to the "auto" side, and if manual, extend the selection switch 2205 to the "manual" side.

Step 1-3: The arithmetic control circuit 810 reads the selection command of the selection switch 2204 of the input device 2000 and stores either the direct machining sequence program or the template sequence program in the program memory 8.
Load from 14.

(1) Direct machining [The operation sequence when direct machining is selected will be explained below. ] Step 1-4: The operator measures only the shape of the lens frame for one eye of the frame and processes the other eye using the inverted data, or measures the shape of the lens frame for both eyes and uses the data for each. The binocular/monocular selection switch 2206 selects whether to process the image based on the image.

Step 1-5: When inputting the horizontal positional relationship between the pupil center of the wearer's eye and the geometric center of the frame, the operator inputs PD and FPD, or inputs the relative amount (amount of shift) between the two. Decide what to do. PD, FPD
To input the
If you want to input the amount of shift, press the "shift" side.

Step 2-1: Set the lens frame of the eyeglass frame on the frame holding device (not shown).

Step 2-2: A lens frame left/right eye determining device (not shown) measures whether the lens frame set in the lens frame shape measuring device is for the left eye or the right eye. That is, when the microswitch of the determination device is turned off, the arithmetic control circuit 810 determines that the lens frame is for the left eye. On the other hand, if the microswitch of the determination device remains ON even after the frame holding device section is set, the arithmetic control circuit 310 determines that the lens frame positioned on the measurement section is for the right eye.

Step 2-3: The determination result of the determination device, that is, whether it is a right-eye lens frame or a left-eye lens frame, is displayed on the liquid crystal display 1100 by a text-based left and right lens identification display 1113, as shown in FIG.

Step 2-4: The operator operates the chucking handle 29 to chuck the lens LE to be processed using the lens rotation shaft 28 of the carriage 2. At this time, the suction cup is suctioned so that its center coincides with the optical center of the lens LE to be processed. That is, the optical center of the chucked lens LE to be processed is set to coincide with the lens rotation axis.

Step 2-5: The operator inputs the patient's PD value using the numeric keypad switch 2300 according to the prescription, and after completing the input, presses the memory switch 2302. Arithmetic control circuit 810
temporarily stores the data in the internal memory and displays the input data on the "PD" display section 1101 of the display.

Next, the worker selects the FPD value using the numeric keypad switch 2.
Enter at 300 and press memory switch 230 after input is complete.
Press 2. Arithmetic control circuit 810 temporarily stores the data in internal memory and displays the input data on "FPD" display section 1102 of display 1100 via controller 1400.

Next, the work is to set the amount of upward shift of the optical center of the lens LE, that is, U, using the numeric key switch 23.
Enter 00, and after completing the input, press the memory switch 2302.
Press. As a result, the arithmetic control circuit 810 stores the input data and displays the display 11.
00 is displayed on the "UP" display section 1103. However, if "shift" is selected in step 1-5, the relative amount (shift amount) of PD and FPD is input using the ten key switch.

Step 2-6: The operator determines the material of the lens to be processed, and if it is a glass lens, the "G start" 11 displayed on the liquid crystal display 1100 shown in FIG.
05, or "P start" if the lens to be processed is a plastic lens.
Press the switch 2402 below 1106.

Step 2-7: Store lens frame data memory 811 as preliminary measurement values.
is memorized.

Step 2-8: The optical center position O ₅ (X ₅ , Y ₅ ) is determined by the calculation control circuit 8.
Calculate with 10.

Step 2-9: Make the rotation center of the lens display detection sensor arm 302 coincide with the pupil center O ₅ (X ₅ , Y ₅ ).

Step 2-10: The arithmetic control circuit 810 performs the main measurement of the lens frame, and new radius vector information ( _rs ρ _o , _rs θ _o ) of the lens frame is obtained.
is obtained and stored in the lens frame data memory 811.

Step 3-1: As shown in FIGS. 11 and 12, the fillers 651 and 653 collect lens frame radius vector information ( _rs ρ _o , _rs
θ _o ) is traced as a trajectory T on the raw lens LE.

Step 3-2: The arithmetic control circuit 810 performs the step 3-1.
Compare the radius R ₁ of the unprocessed lens LE obtained in 1 with the lens frame vector radius ρ _i at its radius vector angle θ _i . R _i <ρ _i
In this case, it is determined that a lens with the desired lens frame shape cannot be obtained even by grinding the lens.
The display device 1000 issues a warning on the display 1100 and stops the execution of the subsequent steps. When R _i ≧ρ _i , the process moves to the next step.

Step 3-3: The arithmetic control circuit 810 stores the lens data memory 82
7.Memorized feeler position information (Z _i , _b Z _i )
Based on this, as shown in Fig. ₁₃ , _the feeler position information ( _f Z _A , _b
Z _A ), ( _f Z _B , _b Z _B ) and the front radius of curvature _f of the raw lens
From R, the rear radius of curvature _b , the front curvature center position _f Z _p of the unprocessed lens, and the rear curvature center position _b Z _p , _f ² = ρ _A ² + ( _f Z _O − _f Z _A ) ² _f ² = ρ _B ² + ( _f Z _O − _f Z _B ) ² …(4) _b ² = ρ _A ² + ( _b Z _O − _b Z _A ) ² _b ² = ρ _B ² + ( _b Z _O − _b Z _B ) ² ... Find _f ² and _b ² from (5).

Next, based on _f ² and _b ² , the curve value C _f of the front refractive surface of the lens LE and the curve value C _b of the rear refractive surface C _f = n-1/R _f ×1000 C _b = n- 1/R _b ×1000...(6) (where n is the lens refractive index) and store this in the memory 827. Also, from _f , _b and lens frame radius vector information ( _rs ρ _o , _rs θ _o ), the edge thickness Δn for each unit angle over the total radial angle θ _o is calculated as Δn = _b Z _o − _f Z _o = √ _b ² − _o ² −√ _f ² − _o ² …(7) This value is obtained and input into the lens data memory 827 and stored.

Step 3-4: The arithmetic control circuit 810 obtains the lens frame radius information ( _rs ρ _M , _rs θ _M ) having the maximum edge thickness Δ _nax and the minimum edge thickness Δ _nio and ( _rs ρ _N , _rs θ _N
)
Select. Next, based on the predetermined bevel shape G of the bevel grinding wheel 3b, the bevel apex P of the lens after bevel processing is the front side of the edge thickness: the back side =
Adjust the bevel apex position _e Z _M , _e so that it is at the 4:6 position.
Find Z _N as _e Z _M = _e Z _M +4/10ΔM _e Z _N = _e Z _N +4/10Δ _N (8). Next, based on the obtained bevel apex positions _e Z _M and _e Z _N , the bevel curve value C _p is determined by the same solution method as the above-mentioned equations (4) and (7), and the bevel curve value C _p The bevel apex position _e Z _i (i=1, 2, 3, . . . , N) for each radial angle is determined from the edge thickness Δ _o and input to the lens data memory 827 and stored.

Step 3-5: The bevel shape between the maximum and minimum edge thickness determined in step 3-4 is displayed on the liquid crystal display 1100 in the automatic bevel display section 1 as shown in FIG.
A graphic is displayed at 110. In Fig. 9, the solid line is the bevel shape at the maximum edge thickness Δ _nax , and A, B
indicate the top and hem of the bevel at maximum edge thickness, respectively. Furthermore, the broken line represents the bevel shape at the minimum edge thickness _Δnio , and A' and B' respectively indicate the top and bottom of the bevel at the minimum edge thickness. In FIG. 9, the bevel apex A at the maximum edge thickness _Δnax and the bevel apex A' at the minimum edge thickness _Δnio are schematically shown to coincide with each other.

Step 3-6: If the input is "manual" in step 1-2, the process goes to step 3-7. If the input is "auto", the process goes to step 4-1.

Step 3-7: When the operator inputs "manual" in the previous step 1-2, the arithmetic control circuit 810 displays the characters "curve" and "curve" on the liquid crystal display 1100 of the display device 1000, as shown in FIG. The operator is prompted to enter the desired numerical values.
The operator operates the numeric keyboard 2300 to input a desired curve value. LCD display 110
The input data is displayed in the "Curve" column of 0,
After confirming this, the operator turns the "memory" switch 2302.
is pressed to store the input data in the internal memory of the arithmetic control circuit 810.

Next, the operator presses the "shift" switch on the switch 2207, and then inputs the desired amount of shift of the bevel apex obtained in previous steps 3-5 and 3-6 in millimeters by operating the numeric key switch 2300. . The input data is displayed on the LCD display 1100.
is displayed in the "alignment" display section 1112.

Step 3-8: Simultaneously with the above operation, the arithmetic control circuit 810 shifts the bevel apex position of the minimum edge obtained in step 3-5 based on the input amount of adjustment by the amount of adjustment, and shifts the bevel apex position of the minimum edge obtained in step 3-5 based on the input amount of adjustment. Each radial angle _rs θ _i
Bevel position information _e for (i = 1, 2, 3...N)
In addition to determining Z _i , the manual bevel shape display section 11 of the liquid crystal display 1100 displays both the bevel apex position of the minimum bevel indicating the bevel with the minimum edge thickness and the maximum bevel indicating the bevel with the maximum edge thickness.
20 is displayed graphically. Here, the solid line indicates the maximum bevel shape, and the broken line indicates the minimum bevel shape. In addition,
C indicates the apex of the bevel at the maximum edge thickness, D indicates the hem at the maximum edge thickness, C' indicates the apex of the bevel at the minimum edge thickness, and D' indicates the hem at the minimum edge thickness.
The example in FIG. 9 shows the bevel shape when the bevel apex is moved to the rear and the bevel curve is small (the radius of curvature is large) compared to the case of auto.

The operator looks at the bevel shape display and, if the bevel position is unsatisfactory, re-inputs the amount of approach and the bevel curve, causes the arithmetic control circuit 810 to calculate the bevel shape based on the new input, and displays it on the display device. . The finally determined bevel position information _e Z _i is stored in the lens data memory 827.

Step 3-9: When the operator looks at the automatic or manual bevel shape display 1110, 1120 and selects automatic bevel, he turns on the start switch 2401 under that display. When selecting manual regeneration, turn on the start switch 2402 below the display.

Step 4-1: The arithmetic control circuit 810 determines from which start switch the signal was received in step 2-6. “G start” side selection switch 2401
If the command is from, go to the next step 4-2.
If the command is from the "P start" side selection switch 2402, the process moves to step 4-3.

Step 4-2: If so, proceed to step 4-3.

Step 4-2: Grind the lens LE into the shape of the lens frame data ( _rs ρ _i , _rs θ _i ).

Step 4-3: The lens is moved by the carriage movement motor 60 to position it on the plastic rough grindstone, and rough grinding is performed in the same manner as in step 4-2.

Step 4-4: The arithmetic control circuit 810 controls the stopper motor 420 via the motor controller 824 to raise the carriage 2 and remove the rough-ground processed lens LE from the rough grindstone 3a, and then the carriage moving motor 60 Control the lens LE to bevel grindstone 3
Position it above b.

Next, the arithmetic control circuit 810 obtains lens frame radius vector information ( _rs ρ _i , _rs θ _i ) (i
= 1, 2, 3...N), and the corresponding bevel position information _e Z _i from the lens data memory 827. Based on these data, the lens rotation axis motor 21 and the abutting motor 4 are
20. Control the carriage moving motor 60 to perform bevel processing on the roughly ground lens using the beveling grindstone 3b.

Step 4-5: After the beveling process is completed, the arithmetic control circuit 810 controls the abutting motor 420 to return the carriage 2 to its home position on the bevel grinding wheel and press the bevel 825.
OFF and stop the grindstone motor 5.

Next, the arithmetic control circuit 810 controls the lens rotation shaft motor 21 to rotate the lens rotation shaft 28 in the direction of arrow 684 in FIG. This rotates the light shielding plate 681 and opens the opening 680. As shown in FIGS. 16 and 17, the arithmetic control circuit 810
rotates the lens radius sensor motor 605 to move the moving frame 610 forward. Accordingly, the lens radius sensor 620 uses a constant torque spring 614.
The contact ring 625 is moved forward by the tensile force of , and the contact ring 625 comes into contact with the vertex of the edge of the beveled lens LE. Since the lens rotation axis 28 is rotated, the encoder 615
is the radial information of the lens LE ( _rs ρ _i ′, _rs θ _i ′) (i=1,
2, 3,...N) is detected, and this is measured by the arithmetic control circuit 810 via the counter 820.

Step 4-6: The lens frame radius vector information ( _rs ρ _i , _rs θ _i ) stored in the lens frame data memory 827 and the previous step 4-6
Lens radius information of the processed lens measured in step 5 ( _rs
ρ _i ′, _rs θ _i ′) to determine whether they match. If both match, proceed to step 4-8.
If they do not match, the process moves to step 4-7.

Step 4-7: When _rs θ _i ′ is larger than _rs ρ _i , the stopper member 4
Lower the height d _i of 22 by a small amount and repeat step 4-
Return to step 4 and perform bevel processing.

Step 4-8: If it is determined in step 4-6 that _rs ρ _i and _rs ρ _i ' match, the initial state is returned.

Step 6-1: The arithmetic control circuit 810 determines whether or not the grinding process has been completed for the binocular lenses. If the grinding process has not been completed yet, the process proceeds to step 5-2. When it is determined that the step is finished, all steps are finished.

Step 6-2 and Step 6-4 The arithmetic control circuit 810 determines whether binocular measurement or monocular measurement was selected in step 1-4, and if "monocular" is selected, the next step is performed. Proceed to step 6-3. When "binocular" is selected, the liquid crystal display 1 of the display device 1000
100 is displayed, and the operator is prompted to set the lens frame 501 for the other eye. Below is the step 2-
After executing steps 2 to 2-4, the process moves to step 2-7.

Step 6-3: When Step 1-4 is a monocular measurement command, the measured right eye lens frame measurement data ( _rs ρ _o , _rs θ _o ) is inverted and the lens frame data is obtained as the left eye lens frame shape. It is stored in the memory 811.

After executing steps 2-4 and 2-6, the process moves to step 3-1.

(2) In the case of template processing If it is determined in step 1-2 that template processing has been selected, the grinding process is executed according to the following steps.

Step 5-1: As shown in FIG. 18, the template SP on which the frame 500 has been pre-shaped is attached to the template holder 27b of the carriage 2.

Step 5-2: The lens LE to be processed is chucked by the lens rotation shaft 28 of the carriage 2.

Step 5-3: The operator determines the material of the lens to be processed, and if it is glass, press Start 2401 or 2402 under the respective indications of "G Start" and "P Start" if it is plastic. push. If switch 2401 is turned on, step 5-4
If the switch 2402 is turned on, the process moves to step 5-5.

Step 5-4: The arithmetic control circuit 810 turns on the switch 825.
The grindstone motor 5 is rotated to rotate the grindstone 3 at high speed. Next, the arithmetic control circuit 810 rotates the lens rotation shaft motor 21 to rotate the lens LE at a low speed. Further, the abutting motor 420 lowers the arcuate portion 422a of the abutting member 422 under the control of the arithmetic control circuit 810 until it is at the same height as the glass rough grindstone 3a. As a result, rough grinding of the lens LE is started.

When the cutoff signal from the photosensor 427 is continuously output for one rotation of the lens rotation shaft 28, the arithmetic control circuit 810 determines that rough grinding is complete,
After controlling the stopper motor 420 to raise the carriage 2 to the normal position, turn off the switch 825.
Stop the grinding wheel 3.

Step 5-5: Move the lens LE to be processed by the carriage moving motor 60.
is positioned on the plastic rough grindstone 3C, and rough grinding is performed in the same manner as in step 5-4 described above.

Step 5-6: The operator inputs using the selection switch 2209 whether the lens after rough grinding should be beveled or smoothed.

Step 5-7: If beveling is selected in step 5-6, the process moves to the next step 5-8, and if smoothing is selected, the process moves to step 7-1.

Step 5-8: The arithmetic control circuit 810 rotates the lens rotation shaft 28 by rotating the motor 21, and the aperture 6
80, as shown in FIGS. 20 and 21, the lens radial sensor motor 605 is controlled to move the moving frame forward, and the tension of the constant torque spring 614 moves the contact ring 625 to the roughly ground lens.
Bring it into contact with the edge of LE. The encoder 615 controls the machining radius _i (i=1, 2, 3,...,
N) and inputs the data to the arithmetic control circuit 810 via the counter 820. The arithmetic control circuit 810 also sets a predetermined amount α to the radius vector measurement value _i.
Feeler 651, 6 is placed at the position of (ρ _i −α)
The motor 605 is controlled so that the free stage 63 comes, and the motor 637 is also controlled so that the free stage 63
3,634 in a free state and filler 65
At step 1,653, the front position _{f i} and rear position _{b i} of the roughly ground lens LE are measured by encoders 661 and 662.

Below are steps 3-3 to 3-9 and 4 described above.
Execute -4 to finish machining.

Step 7-1: If the operator selects smoothing in step 5-6, the arithmetic control circuit 810 reads this in step 5-7, and the carriage moving motor 60
Rotate the lens LE to be processed using the smoothing whetstone 3d.
Move upwards, and then lower the carriage 2 to perform smoothing.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view with one end cut away showing the mechanical part of a lens grinding device according to the present invention, and FIG.
Fig. 3 is a plan view of the lens measuring device, Fig. 4 is a -' sectional view of Fig. 3,
Figures A to C are diagrams showing the configuration and function of the tip of the lens radius sensor section, Figure 6 is a block diagram showing the electrical system of the present invention, Figure 7 is a block diagram showing the electrical system of the frame shape measuring device, and Figure 8 is a block diagram showing the electrical system of the frame shape measuring device. 9 is a plan view of the display device, and FIG. 10 is a flowchart showing the operation sequence of the present invention.
Fig. 1 and Fig. 12 are schematic diagrams showing the action of the lens measuring device, Fig. 13 is a schematic diagram showing the action of the lens measuring device, and Fig. 14 is a schematic diagram showing the relationship between the lens curve and edge thickness. , FIG. 15 is an explanatory diagram showing the relationship between the carriage and the stopper member, FIGS. 16 and 17 are explanatory diagrams of the operation of edge thickness measurement, and FIG.
The figure is an explanatory diagram of bevel processing using a template, No. 19
20 and 20 are explanatory views of the operation of radius vector measurement. 1... Housing, 2... Carriage, 3... Grindstone, 28
a, 28b...Lens rotation axis, 200...Frame shape measuring device, 300...Measuring unit, 356...Bevel feeler, 601...Base frame, 605...Pulse motor, 610...Movement frame, 620...Lens radius vector sensor, 625...Contact ring, 651,66
53... Feeler, 810... Arithmetic control circuit.

Claims (1)

[Scope of Claims] 1. An edge thickness measuring means for measuring the edge thickness of a lens to be processed; and an input for changing at least one of the bevel approach amount and the curve value in order to correct and set the bevel apex position. means, which can be obtained after beveling the lens to be processed from the bevel position condition input by the input means, at least the maximum and minimum edge thickness information obtained from the edge thickness measuring means, and the bevel shape of the bevel grinding wheel; a calculating means for calculating a likely expected lens bevel shape, and graphically displaying the expected lens bevel shape showing at least a chevron-shaped bevel portion and a hem portion extending below the bevel at the maximum and minimum edge thicknesses based on the calculation results of the calculating means. and a control section for storing the bevel position conditions finally set by the input means and controlling and driving the bevel processing of the lens to be processed based on the stored bevel position conditions. Lens grinding equipment.