JPH0192055A - Grinding of lens and device thereof - Google Patents

Abstract

PURPOSE:To facilitate the frame fitting work by carrying out the three dimensional measurement for the shape of a lens frame and roughly grinding the lenses by the NC control on the basis of the measurement information and grinding the V-block. CONSTITUTION:A calculation control circuit 100 controls the revolution of a pulse motor 32 through a motor driving device 101 by the start instruction supplied from a keyboard 104, and the three-dimensional measurement is carried out by the calculation circuit 100 according to the pulse quantity by the following control of a pulse motor 41 and the signal supplied from an encoder 5, copying the V-block groove of a lens frame B by a detector 52, and the result of the measurement is memorized in a memory 103. Then, a grinding wheel 6 is rotated by a motor 5, and the pulse motors 15 and 11 are NC-controlled by the memorized shape information and the signal of an encoder 24, and the rough grinding work for lenses A is performed. Then, the V-block of the lenses A is worked similarly by the pulse motors 15 and 25, encoder 24, etc. Therefore, the frame setting work can be easily carried out without deteriorating the optical characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for grinding an eyeglass lens that can accurately and easily match the eyeglass lens to a lens frame of the eyeglass.

(Prior Art) As shown in Japanese Unexamined Patent Publication No. 118460/1983, in the past, when an eyeglass lens is ground to match the lens frame of the eyeglass, a lens frame shape measuring means is used to measure the lens frame of the eyeglass. The two-dimensional shape of the lens frame is measured, and based on the measured value, the unprocessed eyeglass lens is roughly ground using a grinding device to form a roughly ground eyeglass lens that matches the two-dimensional shape of the lens frame.
Next, a bevel (without sufficient consideration of the three-dimensional shape of the lens frame) is machined on the peripheral surface of this roughly ground spectacle lens using a grinding device so that the bevel does not come off the peripheral surface. (Problems to be Solved by the Invention) Therefore, the bevel is governed by the three-dimensional shape of the peripheral surface of the roughly ground eyeglass lens, and does not accurately match the three-dimensional shape of the lens frame of the eyeglass. Therefore, when fitting a spectacle lens into a lens frame, the lens frame must be forcibly bent and deformed in order to align with the spectacle lens, which requires a great deal of effort. Furthermore, when the lens frame is bent as described above, the interaction between the eyeglass lens and the lens frame causes distortion in the entire eyeglass, and in some cases even adversely affects the optical properties of the eyeglass.

The present invention has been made in order to solve the above-mentioned problems, and provides a method and apparatus for grinding an eyeglass lens that allows the eyeglass lens to match the lens frame of the eyeglass as accurately and easily as possible. With the goal.

(Means for Solving the Problems) The first invention to achieve the above object measures the shape of the lens frame of the eyeglass in three dimensions, and rough grinds the eyeglass lens by numerical control based on this measurement information. It is characterized by grinding the bevel at the same time.

The second invention also provides a three-dimensional frame shape measuring means for three-dimensionally measuring the shape of a lens frame of eyeglasses, and a method for rough grinding and bevelling of eyeglass lenses by numerical control based on measurement information obtained by the means. The present invention is characterized by comprising an eyeglass lens grinding means for performing the grinding process.

(Function) Since the bevel of the eyeglass lens is processed under the control of the three-dimensional shape of the lens frame, the eyeglass lens accurately matches the lens frame. Further, since the grinding is performed by numerical control, much human labor is not required.

゛ (Embodiment) Fig. 1 is an overall schematic diagram showing a frame shape three-dimensional measuring means and an eyeglass lens grinding means according to an embodiment of the apparatus of the present invention.

In the figure, reference numeral 1 denotes a grinding device that forms a part of the eyeglass lens grinding means, and the basic structure is not different from that disclosed in Japanese Patent Application Laid-open No. 118460/1983, and only the schematic structure is shown below. explain. That is, a grinding wheel device 3 and a carriage vertical drive device 4 are arranged at fixed positions on the fixed table 2 side, and the former is equipped with a grinding wheel drive motor 5 and a grinding wheel 6 fixedly connected to its rotating shaft. The grinding wheel 6 has a structure in which a rough grinding wheel 7, a beveling grinding wheel 8, and a flat precision processing grinding wheel 9 are concentrically connected, and the latter has a stopper whose rotation is regulated by a locking member (not shown). A screw rod 12 that rotates coaxially with the rotating shaft of a motor 11 is screwed into a screw hole of the member 10, and the abutment member 10 is vertically displaced as the motor 11 rotates.

Above the fixed table 2, a grinding carriage 13 is supported by a shaft 14 so as to be slidably displaceable in the direction along the rotation axis of the grindstone drive motor 5, and is installed so as to be able to swing freely around the shaft 14. ing. This carriage 13 has a pulse motor.
15 is provided, and when the pulse motor 15 rotates, the lens rotation shaft 1 pivotally supported on the carriage 13 is rotated.
6.17 is rotated via belt 18 and pulley 19.20. One of the lens rotation shafts 17 is configured to be rotatable only, and the other lens rotation shaft 16 is configured to be able to be displaced in the axial direction by rotating a handle 21 manually or electrically for chucking the eyeglass lens A. . Also,
The carriage 13 is configured to be vertically swung around a shaft 14 by vertically displacing the abutting member 10 of the carriage vertical drive device 4, and when the carriage 13 is swung downwards, the lens rotation shafts 16 and 17 move toward the grinding wheel. 6, and in reverse operation of the carriage 13 the lens rotation axis 16.17
is in a relationship where it is separated from the grinding wheel 6. Fixed stand 2
On the side, a scale 22 is rotatable around the base, and is inserted into a through hole of an encoder head 23, so that both 22 and 23 form a linear encoder 24. That is, by detecting the relative displacement between the scale 22 and the encoder head 23, the swinging displacement of the carriage 13, in other words, the lens rotation wheel 1 is detected.
The relative distance between 6.17 and the grindstone surface is detected. Another pulse motor 25 is disposed near the carriage 13, and a screw shaft 26 connected to the rotating shaft of the pulse motor 25 is screwed into a screw hole provided in a carriage support 27. As the carriage 13 rotates, the carriage 13 and the carriage support stand 27 are slidably displaced along the grindstone surface.

According to the grinding device 1 having the above configuration, three pulse motors are used.
By independently driving the lenses 11, 15, and 25 by the required amount, it becomes possible to three-dimensionally process the spectacle lens A chucked to the lens rotation shafts 16 and 17.

26 is a shape information detection device forming a part of the frame shape three-dimensional measuring means. In detail, as shown in FIGS. 2 and 3, a rotating shaft 28 is erected within a carriage support 27, and a bearing portion 29 is provided at the lower end of the rotating shaft 28 to support the rotating shaft 28 so as to freely rotate. There is a rotation base 30 on the zero rotation axis 28.
is fixed horizontally, and a pulley 31 is fixedly installed, and a transmission belt 34 is connected between this pulley 31 and a driving pulley 33 fixed to the rotating shaft of a pulse motor 32 fixed to the carriage support 27 side. The rotation shaft 28 is rotated by the rotation of the pulse motor 32 without slipping. Rotating base 3
Guide rods 35 are erected and fixed from the four corners of 0, and their upper ends are connected to each other by a temporary frame 36 to enhance the rigidity between the guide rods 35. A cylindrical nut body 38 having a gear 37a fixed to its outer peripheral surface is rotatably mounted on the upper end of the fixed shaft 37, and the cylindrical nut body 38
A screw shaft 39 is screwed into the screw shaft 39, and its upper end is fixed to the lower surface of a stage 40 which is guided by a guide rod 35 so as to be vertically movable only in a horizontal state, and on the other hand, the gear 37 is rotated. It is meshed with a driving gear 42 fixed to the rotating shaft of a pulse motor 41 fixed to the upper surface of the base 30. Therefore, when the pulse motor 41 rotates, the stage 40 is vertically displaced while maintaining the horizontal position. A guide track 43 having the radius of the rotating shaft 28 is formed on the upper surface of the stage 40, and this guide track 4
A measurement carriage 44 whose movement direction is regulated by a guide track 43 is mounted on the measurement carriage 3 . A horizontal guide rod 46 is attached to the rear surface of the carriage casing 45 along the guide track 43.
The rear part of the receiver, which is fixed to the stage 40 and is erected on the stage 40, is slidably inserted into a through hole (not shown) of the stop plate 47, and the rear surface of the carriage casing 45 and the receiver are fixed to each other. A compression spring 48 is provided between the horizontal guide rod 46 and the plate 47 so as to be fitted onto the horizontal guide rod 46 . Further, a rack member 49 is provided on the rear surface of the carriage casing 45 in parallel with the horizontal guide rod 46, and is meshed with a pinion gear 49a fixed to the rotating shaft of a pulse encoder 50 fixed on the stage 40. , when the carriage 44 is displaced on the guide track 43, the pulse encoder 50 is rotated in accordance with the amount of displacement.

A detection device 53 is provided in the carriage casing 45 for detecting the vertical displacement of the detector 52 that comes into contact with the bevel groove 51 formed in the lens frame B of the glasses. a detection rod 55 which is equipped with a structure and is swingable around a support shaft 54;
It consists of a sensor 56 that detects when the detection rod 55 rotates a certain minute amount clockwise, and a sensor 57 that detects when the detection rod 55 rotates a certain minute amount clockwise. A fixing device (not shown) for fixing the lens frame B of the glasses is provided on the upper surface of the frame 27, and the detector 5
2 will move following the bevel groove 51 of the lens frame B fixed thereto.

To explain the operation of the shape information detection bag W26, first fix the lens frame B of the glasses at an appropriate position, and as shown in FIG. Set it so that it is centered. Thereafter, the pulse motor 32 is rotated to rotate the stage 40. Then, the measurement carriage 44 moves to the detector 5.
2 and revolve around the rotation axis 28. On the other hand, the detector 52 is brought into contact with the inner surface of the bevel groove 51 of the lens frame B by the biasing force of the spring 48, and its position is regulated. Therefore, when the pulse motor 32 rotates, the detector 52 is moved horizontally along the guide track 43 under the control of the bevel groove 51 of the lens frame B, and is also oscillated around the support shaft 54. become.

The displacement of the detector 52 along the guide track 43 is determined by the rack member 4
9 and pinion gear 49a. Therefore, the encoder 50
As shown in FIG. 4(a), the stage 40 corresponds to the rotation angle of each pulse of the pulse motor 32, as shown in FIG. 4(a). Digital information of radius vector R at each rotation angle θ (θs= , R+=-) (k=1, 2.3...
...n) becomes detectable.

On the other hand, the vertical displacement of the detector 52 is such that the lens frame B is
), and when the bevel groove 51 curves downward from the reference position, the state of the detection rod 55 changes from Fig. 5(a) to Fig. 5(a).
b), and the sensor 57 detects this.

On the other hand, when the bevel groove 51 curves upward from the reference position, the state of the detection rod 55 changes from Fig. 5(a) to Fig. 5(C).
), and the sensor 56 detects this. In this way, the upper and lower curvature of the bevel grooves 51 can be distinguished, and each rotation angle θ of the stage 40 can be distinguished.
In order to detect the amount of curvature Yk in FIG. 4(b), it is necessary to further detect the amount of up and down. Therefore, stage 40
If the sensor 56 issues a detection signal at the angle θ position where In order to achieve this, the pulse motor 41 is rotated in the opposite direction, and in either case, the rotation of the pulse motor 41 is stopped when the detection rod 55 returns to the equilibrium state shown in FIG.

If the rotation amount of the pulse motor 41 at this time is judged by the number of pulses, the amount of curvature Y of the bevel groove 51 at each angle θ
Digital information of k (θyo, Yt+) (k=12.3...
・n) becomes detectable.

Thus, the three-dimensional shape information (θh, R
It becomes possible to obtain lI, Yh) (k=t, 2.3·-n).

100 is an arithmetic control circuit composed of a microprocessor for various arithmetic operations and program control; this arithmetic control circuit 100 receives signals from sensors 56, 57, and also receives signals from each motor 5.11.15.25. 32.41
A motor drive device 101 for driving the motor, a counter circuit 102 for counting the signals from each encoder 24.50, and shape information of the lens frame B from the arithmetic control circuit 100 (θs=, Rh, Ym) ( k=1.2.
3...n), a frame shape memory 103, an input keyboard 104, and an interface circuit 10.
An input system 106 consisting of 5 is connected. These electrical system parts 107 function as a common part of the frame shape three-dimensional measuring means and the eyeglass lens grinding means.

FIG. 6 shows a flowchart in the apparatus of this embodiment.

Each step will be explained below.

(1) Lens frame measurement step Step 1-1: This step is executed by the frame shape three-dimensional measurement means.

That is, when a start command is input from the keyboard 104, the motor drive device 101 starts the pulse motor 3.
2 is rotated by a clock pulse C-P generated from the arithmetic control circuit 100, and the detector 5 is rotated along with the stage 40.
2 to revolve. The detector 52 traces the bevel groove 51 of the lens frame B with which it is in contact, and is displaced along the guide track 43 and also in the vertical direction. The former displacement is detected by the encoder 50, and the detection signal is sent to the counter circuit 1.
Count at 02. On the other hand, the vertical displacement of the detector 52 is determined by counting the number of pulses required for returning the detection rod 55 to an equilibrium state by the pulse motor 41 by a counter circuit (not shown) in the arithmetic control circuit 100. Since the clock pulse C-P of the arithmetic control circuit 100 is input to the counter circuit 102, each displacement is synchronized with this clock pulse C-P. In other words, each rotation angle θ of the stage 40 is will be counted accordingly. Based on the counted value, three-dimensional shape information (0m, Rh,
Yk) (k=1.2.3·-n) is obtained, and this is stored in the frame shape memory 103 via the arithmetic control circuit 100.

Thereafter, the following steps are executed by the spectacle lens grinding means.

(2) Rough grinding second step Step 2-1: Rotate the grinding wheel drive motor 5 to rotate the grinding wheel 6. Next, the chaffed unprocessed eyeglass lens is stored in the frame shape memory 103 using the shape information (θh , Rh, Yh) (k=1.2.3・=n) and the radius vector Rk, the lens rotation wheel 16.1
While driving the driving pulse motor 15 of No. 7, the pulse motor 11 is driven while confirming the position of the carriage 13 with the encoder 24, and rough grinding is performed in the same manner as in JP-A-60-118460. After processing, the carriage 13 is swung upward and retracted.

(3) Bevel addition step Step 3-1: The pulse motor 15 that rotates the lens rotation wheels 16 and 17 is rotated by the clock pulse C-P from the pulse generator (not shown) of the arithmetic and control circuit 100, and the lens rotation axis is rotated. 16.Move 17 to the position of angle (θ=0). At this time, the arithmetic control circuit 100 stores the shape information (θ*, Rk, Y
m ) (k-1, 2, 3...n), the angle θ1 and the amount of curvature Y1 are input as comparison reference values.

Step 3-2: The carriage 13 is moved along the rotation axis of the grindstone drive motor 5 via the motor drive circuit 101 by a distance corresponding to the comparison reference value by the arithmetic control circuit 100, and the rim of the eyeglass lens is roughly ground. Surface beveled whetstone 8
Align with the center of the groove.

Step 3-3: The carriage 13 is lowered to bring the rough-ground lens into contact with the bevel grindstone 8, and - a bevel of a certain height is machined at a predetermined position.

The first time when Rk=R+ is a movement from the initial position.

Step 3-4: It is detected based on the position of the carriage 13, that is, the signal from the encoder 24, that a bevel of a predetermined height has been processed.

Step 3-5: The arithmetic control circuit 100 rotates the pulse motor 15 via the motor drive device 101 to rotate the lens rotation shaft 16, 17 to the next angle θ2.

Step 3-6: The arithmetic control circuit 100 reads out the amount of curvature Y2, etc. corresponding to the angle θ2 from the frame shape memory 103, and sets this as a reference value for comparison. The pulse motor 25 is rotated by an amount corresponding to this comparison reference value Y2 via the motor drive circuit 101, and the carriage 13 is moved along the rotation axis of the grindstone drive motor 5.

Then process the bevel again. The encoder 24 detects that the bevel has been processed, and the lens rotation axis 16.
17 to the next angle θ, I.

This cycle is executed while comparing the shape information in the frame shape memory 103 until the lens rotation wheel 16.17 completes one rotation.

Step 3-7: Once the lens rotation wheels 16 and 17 have finished machining the bones, the pulse motor 11 is rotated to move the carriage 13 upward, and the grindstone drive motor 5 is stopped.

(Effects of the Invention) As described above, according to the present invention, the lens frame B is three-dimensionally measured,
Through numerical control based on the measurement information (shape information),
Since the unprocessed lens is rough-ground and the bevel is processed, the shape of the bevel can be accurately and easily matched to the lens frame B. Therefore, when fitting the spectacle lens A into the frame, the lens frame B is not forced. This eliminates the need to bend the glasses, which simplifies the framing process and prevents the optical properties of the glasses from being compromised.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic diagram showing one embodiment of the device of the present invention, and FIG.
3 and 3 are a partially sectional front view and a partially omitted plan view of the shape information detection device, FIG. 4 shows the lens frame of the glasses, a) is a plan view, (b) is a side view, and FIG. (a) to (C) are explanatory diagrams of the operation of the measurement carriage, and FIG. 6 is a flowchart of the embodiment apparatus. (Symbols) A... Spectacle lens, B... Lens frame, 1... Shape information detection device, 30... Rotating base, 32... Pulse motor, 40... Stage, 41...・Pulse motor, 43... constant orbit, 44... measurement carriage,
50... Encoder, 51... Bevel groove, 52...
-Detector, 53...detection device. 1. Indication of the incident 1988 Patent No. 125166 2 Title of the invention Method and device for grinding eyeglass lenses 3
, Relationship with the case of the person making the amendment Patent applicant 4, agent address 7 Sanyo Building, 2-6 Minamicho, Fukuyama City, subject of amendment

Claims (1)

[Claims] 1. The shape of the lens frame (B) of the eyeglasses is measured three-dimensionally, and the eyeglass lens (A) is formed by numerical control based on this measurement information.
A method for grinding eyeglass lenses, comprising rough grinding and bevel grinding. 2 Rough grinding and bevel grinding of the eyeglass lens (A) using a three-dimensional measuring means for three-dimensionally measuring the shape of the eyeglass lens frame (B) and numerical control based on the measurement information obtained by the means An eyeglass lens grinding device characterized by comprising numerically controlled grinding means for processing. 3. The three-dimensional measuring means is provided with a stage (40) that is only movable vertically on a rotary base (30) driven by a pulse motor (32), and the stage (40)
is driven by another pulse motor (41) and is vertically displaced in direct proportion to the amount of rotation of the pulse motor (41), and on the stage (40) is a motor that is biased in a certain direction and has a constant trajectory. (43) is provided with a measuring carriage (44) which can be freely reciprocated.
), a detection device (53) capable of detecting the vertical displacement of the detector (52) that comes into contact with the bevel groove (51) of the lens frame (B).
Claim 2: A shape information detection device (1) comprising: a shape information detection device (1) equipped with an encoder (50) for detecting displacement of the carriage (44) along a fixed trajectory; The described eyeglass lens grinding device.