JP2000176811A - Automatic lens midsection correcting work method and device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need to manually measure the midsection of a lens in an automatic lens working even when the lens requires strict precision of the midsection. SOLUTION: In an automatic lens-working line, the process from the supply of a lens raw material to a curve-generator-work and precision grinding is automated. By measuring the midsection of the lens raw material which is curve-generator-worked and precision-ground, and a master lens, and calculating the difference between the measured values of the midsection, obtained by the measurement to correct the feed of the axis of the work on the course of the curve-generator work, the accuracy of the midsection of the lens on the course of the line of automatic lens working is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic lens processing line for automatically performing lens generator supply, curve generator processing (hereinafter abbreviated as CG processing), fine grinding processing, and subsequent polishing processing. The present invention relates to a method and an apparatus for automatically correcting the thickness of a lens in an automatic processing machine.

[0002]

2. Description of the Related Art FIG. 15 and FIG.
1 shows a conventional automatic processing line for a lens disclosed in Japanese Patent No. 749. The automatic lens processing line includes a lens material automatic supply device 101, a CG processing device 103, a fine grinding device 106, a polishing device 109, a centering device 112,
The finished product storage devices 114 are arranged in order, and the lens material is automatically created on the lens according to the following steps.

(1) Automatic supply of lens material A large number of lens materials 115 placed in the lens material automatic supply device 101 are transferred to the next CG processing device 1 by the robot 102.
03 are automatically supplied one by one.

(2) CG machining In the machining head 104 of the CG machining apparatus 103, a cup-shaped diamond grindstone 117 is used on the A surface a of the lens material 115 whose side surface C is held by the chuck 116 as shown in FIG. A spherical surface is created (FIG. 16A), and the processing head 105 creates a spherical surface on the other B surface b of the lens material 115 using a cup-type diamond grindstone 118 (FIG. 16B).

(3) Fine grinding process In the processing head 107 of the fine grinding device 106, the surface A of the lens material 115 held by the lens holder 119
Is finely ground by a spherical fine grinding tool 121 to which a diamond pellet 120 is attached (FIG. 16C), and the processing head 108 attaches the diamond pellet 120 to the B surface b of the lens material 115 held by the lens holder 122. Fine grinding is performed by the spherical fine grinding tool 123 (FIG. 16).
(D)).

(4) Polishing In the processing head 110 of the polishing apparatus 109, the B-side b of the lens material 115 held by the lens holder 124 uses a spherical polishing tool 126 to which a polishing sheet 125 such as a polyurethane sheet is adhered. Polishing is performed while being supplied with a polishing liquid 127 containing, for example, cerium oxide (FIG. 16).
(E)) In the processing head 111, the lens holder 12
The surface A of the lens material 115 held by the lens 8 is coated with a polishing liquid 12 containing cerium oxide or the like using a spherical polishing tool 129 to which a polishing sheet 125 such as a polyurethane sheet is attached.
7 while being supplied (FIG. 16 (f))

(5) Centering process In the centering device 112, a pair of cup-shaped holders 130,
131, the lens material 115 is pinched and centered, and the side circumferential surface c of the lens material 115 is
In step 2, grinding is performed to a perfect circle (FIG. 16 (g)).

(6) Storage of Finished Product The lens after the centering process is stored in the completed product storage device 114 by the robot 113.

[0009]

In recent years, optical devices such as cameras, microscopes and endoscopes have been reduced in size and improved in function. Accordingly, it has become essential to improve the quality of a single lens used in the optical system of an optical device, particularly, the accuracy of medium thickness (thickness accuracy of the lens on the optical axis).

[0010] However, in order to improve the thickness of the lens created by the above-described conventional apparatus, the lens is extracted between each step from the CG processing to the polishing processing, and the thickness of the lens is measured using a dial gauge or a magnetic scale. It is performed manually, and when a deviation from the standard of the desired thickness occurs, it is necessary to correct the processing conditions in the processing step or the pre-processing step. For this reason, the automatic processing line is stopped during the execution of the lens thickness measurement and the correction of the processing conditions, the cycle time is extended, and the operation rate of the apparatus is reduced.

In order to reduce labor costs, a single operator is responsible for several automatic processing lines to produce a lens having a strict medium accuracy standard. Correction occurs more frequently than a normal lens, and the number of assigned lines decreases. For this reason, a lens with a strict standard for medium-wall accuracy requires a high labor cost and a high cost.

Further, of the CG processing, the fine grinding processing, and the polishing processing, it is more difficult to control the medium thickness in the fine grinding processing than other processing. In other words, since the CG machining is forcibly proceeding based on the motherhood principle, there is little change in the fillet. Considering the elongation of the grinding wheel shaft and the work shaft rotating spindle until the thermal change of the spindle becomes constant at startup. By performing the warm-up operation, the change in the thickness of the fillet after that is small, while the grinding process is a copying process, so the machining allowance is adjusted by the machining time control, but since the set value is as small as several μm, the machining allowance is small. Variations have little effect on medium meat accuracy. On the other hand, in the fine grinding process, the copying process is the same as the polishing process, and the allowance is 20 μm.
m to 70 μm (this removal amount is set according to the difference in the mesh or bond of the diamond pellet used in the fine grinding process depending on the set value of the grinding wheel mesh or bond used in the CG process or the removal amount in the polishing process. .)
This is because a large amount of allowance is required, and the variation in the allowance significantly affects the accuracy of the medium thickness.

The factors causing the variation in the allowance for the fine grinding will be described below. In general, the fine grinding process is medium
And shape control. The former fill changes with the processing load, the processing time, and the number of revolutions of the tool, and the latter changes with the swing of the tool or the lens holder.

For example, in the case of a spherical center polishing machine as shown in FIG. 17, the spherical grinding tool 121 swings around the convex lens material 115, that is, the center of curvature O (the center axis d of the lens holder 119). From the center of rotation of the spherical grinding tool 121 to the swing center angle θ, and swing about the angle θ to both sides at an angle α / 2), and rotate about the tool axis e. At this time, the lens holder 119
Thus, the lens material 115 is pressed from above, and the lens material 115 is rotated by the rotation of the spherical grinding tool 121 to perform fine grinding.

The shape is controlled by a diamond pellet 120.
This is performed by changing the staying time of the lens material 115 for each point on the processing surface 120a. That is, the lens material 11
In the case where the radius of curvature becomes larger than the target value, the amount of wear near the center is increased by decreasing the swing center angle θ and increasing the time the lens material 15 stays near the center of the processing surface 120a of the diamond pellet 120. Is relatively increased. As a result, the radius of curvature of the processing surface 120a of the diamond pellet 120 changes in a direction to decrease, and the surface is transferred to the lens material 115. In addition, lens material 1
When the radius of curvature of the circle 15 becomes smaller than the target value, the swing center angle θ is increased to increase the time for which the lens material 115 near the outer periphery of the processing surface 120a of the diamond pellet 120 stays, thereby reducing the amount of wear near the outer periphery. Increase relatively. Thereby, the processing surface 120 of the diamond pellet 120
The radius of curvature of “a” changes in a direction to increase, and the lens material 1
The surface is transferred to 15.

Therefore, control of the shape in the copying process is as follows.
When the radius of curvature becomes smaller around the target radius of curvature, the swing condition is changed so as to increase, and when the radius exceeds the target value, the swing condition is changed so as to become smaller. . The change in the swing condition is a main cause of the variation of the meat. This is because as the swing center angle θ increases, the time that the lens material 115 stays on the outer peripheral side of the processing surface 120a of the diamond pellet 120 increases, and the peripheral speed of the diamond pellet 120 increases. This is because the relative speed of the lens material 115 is increased, and the amount of the lens material 115 per unit time is increased.

As described above, in the copying process in the fine grinding process, the change of the swing condition, which is indispensable for controlling the shape, deteriorates the accuracy of the medium thickness. Therefore, in the case of a lens with strict medium accuracy, when the swing condition is changed to maintain the shape by the automatic processing line, the frequency of medium measurement is increased, It must be adjusted according to conditions such as the number and processing time, so that the allowance is kept constant.

[0018] Other factors of the variation of the medium meat include:
Immediately after the lapping operation of the diamond pellets of the spherical fine grinding tool or when clogging occurs, the stock removal gradually decreases. Also in that case, it is necessary to correct the processing conditions by performing the measurement of the medium thickness.

As described above, according to the conventional automatic lens processing line, when processing a lens having a strict inner wall precision, a lens material is extracted between each processing step, particularly when the fine grinding step is completed, and the inner wall thickness is manually measured. It is necessary to correct the processing conditions. For this reason, there is a problem that the cycle time is increased (that is, the operation rate is reduced), and the cost of the lens is increased due to a rise in labor costs due to a decrease in the number of lines.

Accordingly, the present invention provides a method for processing a lens with strict medium thickness accuracy in an automatic lens processing line.
By automatically measuring the fill and automatically correcting the processing conditions, it is possible to shorten the cycle time and increase the number of lines to reduce the cost of the lens. It is intended to provide a method and apparatus.

[0021]

According to a first aspect of the present invention, there is provided a machining method for automatically processing a curve generator and a precision grinding process from supply of a lens material. A step of measuring the fill of the lens material and the master lens after the generator processing and the fine grinding processing, and a step of calculating the difference of the fill measurement by the measurement and correcting the feed of the work axis of the curve generator processing. It is characterized by having.

According to the present invention, the contents of the master lens and the processed lens material are measured, and the feed of the work axis of the curve generator processing is corrected based on the measured difference in the thickness of the lens material. The processed meat can be processed with high precision. For this reason, even during the automatic processing of the lens, it is possible to perform the processing corresponding to the strict medium precision.

A second aspect of the present invention is the invention according to the first aspect, wherein the lens material is attached to an attaching plate.

By sticking the lens material on the sticking plate, the lens material can be stably fixed, and the processing of the lens material and the measurement of the medium thickness can be performed with high accuracy.

According to a third aspect of the present invention, in the first aspect of the invention, in the step of calculating the difference in the measurement of the medium thickness, when the lens material exceeds the standard, an error is displayed by an alarm. And

A lens exceeding the standard is inferior in eligibility as a lens and can be removed from production by displaying an error by an alarm. For this reason, a lens with poor eligibility is not brought to the next process.

According to a fourth aspect of the present invention, in the step of calculating the difference in the medium thickness measurement, an average value of a plurality of differences in the medium thickness measurement is calculated, and the work axis of the curve generator machining is calculated based on the calculated value. Is corrected.

The average value of the difference between the large number of medium thickness measurements is stable, and the work axis feed for curve generator machining is corrected based on this average value, so that stable correction can be performed. In addition, by removing a sudden change in the value from the average value, it is possible to prevent an erroneous correction of an error during the measurement of the medium thickness.

According to a fifth aspect of the present invention, there is provided a lens automatic processing line for automatically performing curve generator processing and fine grinding processing from supply of lens material to a lens material having completed the curve generator processing and a master lens. The step of measuring the thickness of the medium and the processing time are calculated from the difference between the measurement of the thickness of the medium and the processing speed when the lens material of the preceding stage was finely ground before the measurement, and the fine grinding of the lens material is performed with the calculated processing time. The step of performing the processing, the step of measuring the thickness of the lens material that has been subjected to the fine grinding, and the processing speed is calculated from the allowance derived from the difference in the thickness after the fine grinding and the calculated processing time. The processing speed is used as the processing speed when calculating the processing time of the lens material of the next stage to be subjected to fine grinding.

According to the present invention, the processing time of the lens material is calculated from the difference in the measurement of the medium thickness and the processing speed of the lens material in the preceding stage, and further, the margin is calculated from the difference in the thickness of the lens material after the fine grinding. In order to control the processing speed of the lens material at the next stage based on the machining allowance and the processing time described above, the processing time can be set by continuous data for each processing of the lens material. For this reason, it is possible to cope with strict medium accuracy with high accuracy.

The invention according to claim 6 is the invention according to claim 5, wherein in the step of measuring the thickness of the lens material that has been subjected to the fine grinding, when the lens material exceeds a standard,
An error is displayed by an alarm.

By displaying an error by an alarm, a lens having poor eligibility is not brought to the next step.

In a lens processing apparatus according to a seventh aspect of the present invention, in a lens automatic processing line for automatically performing a curve generator process and a fine grinding process from the supply of a lens material stuck to the sticking plate, the sticking plate having the lens material stuck thereto. A holding ring for holding a sticking plate having the same shape as the holding ring and having a master lens stuck thereon,
A lens holder having a rotary table for holding the two holding rings with a center between the center axes of the two holding rings as a rotation axis, and a rotation driving means for rotating and positioning the rotary table; Linear drive means for vertically moving, a detection scale arranged to face the center axis of the holding ring and measuring the thickness of the lens material and the thickness of the master lens, and held at the outer periphery of the detection scale, A positioning ring that fits into the holding ring and positions the detection scale with respect to the holding ring;
A medium calculating device having a medium calculating circuit for calculating a difference between the lens material and the master lens, and a control device for correcting a processing amount of the curve generator processing based on a signal from the medium calculating device. And characterized in that:

In the present invention, the detection scale is positioned with respect to the holding ring by bringing the lens holding portion close to the detection scale and fitting the holding ring to the positioning ring. Since the positioning of the lens material and the content of the master lens are measured by this positioning, the content of the content can be accurately measured. In addition, since the control means corrects the amount of curve generator processing based on the measured difference in the fill, the fill of the lens material can be controlled during the automatic processing line of the lens, corresponding to strict fill accuracy. Processing can be performed.

According to an eighth aspect of the present invention, there is provided an automatic lens processing line for automatically performing curve generator processing and fine grinding processing from supply of lens material, wherein a holding ring for holding the lens material and the spherical portion of the master lens by vacuum suction is provided. Linear drive means for vertically moving the holding ring, a detection scale which is held opposite to the center axis of the holding ring and measures the thickness of the lens material and the master lens, and which is attached to the detection scale, Calculates the difference between the measurement ring that fits into the ring and the relative position with the holding ring and the measurement material that contacts the lens material on the holding ring and the spherical part of the master lens, and the thickness between the lens material and the master lens. A medium calculation device having a medium calculation circuit for performing Characterized in that it and a control device for correcting the machining amount of the probe generator processing.

In the present invention, the holding ring holds the lens material and the master lens by vacuum suction, and in this holding state, the holding ring is fitted to the measuring ring to measure the lens material and the thickness of the master lens. For this reason, the inside meat can be measured accurately. In addition, since the control means corrects the amount of curve generator processing based on the measured difference in the fill, the fill of the lens material can be controlled during the automatic processing line of the lens, corresponding to strict fill accuracy. Processing can be performed.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to embodiments shown in the drawings. In each of the embodiments, the same elements are denoted by the same reference numerals and correspond to each other.

(Embodiment 1) FIGS. 1 to 5 show Embodiment 1 of the present invention, FIG. 1 is a plan view of an automatic lens processing line, FIG. 2 is a side view of a filling measuring unit, and FIG. FIG. 4 is a cross-sectional view of a work axis of the CG processing apparatus, and FIG. 5 is a cross-sectional view of a state where the medium thickness is measured by the medium thickness measurement unit.

As shown in FIG. 1, in the automatic lens processing line, the CG processing device 6, the first precision grinding device 7, the second
Grinding machine 8, polishing machine 9 and stocker 3
Are arranged side by side.

The stocker 3 supplies the lens material 1 stuck on the sticking plate 2 (see FIGS. 2 and 4) with an adhesive, and removes the finished lens material after the lens material 1 has been polished. It is a unit to be stored. The robot 4 attached to the stocker 3 holds the sticking plate 2
The lens material 1 is sequentially supplied from a pallet 5 containing a large number of lens materials 1 stuck on the pallet, and the completed products are sequentially stored on the pallet 5. By attaching the lens material to the attachment plate 2 in this manner, the lens material can be fixed stably.

The CG processing device 6 performs CG processing on the processing head 12 using a cup-shaped diamond grindstone. The first fine grinding apparatus 7 performs a copying process using a metal bond diamond pellet having a spherical shape in the processing head 13 (this is referred to as a fine grinding process 1). The second fine grinding apparatus 8 performs a copying process using a resin bond diamond pellet having a spherical shape in the processing head 14 (this is referred to as a fine grinding process 2). The polishing apparatus 9 performs polishing in the processing head 15 while receiving supply of water with a spherical resin bond cerium oxide grindstone or supply of a polishing liquid containing cerium oxide or the like with a spherical tool to which a polishing sheet is attached. .

The belt conveyor 10 is moved from the stocker 3 to C
The lens material 1 is transported to the G processing device 6. The belt conveyor 11 sequentially conveys the lens material 1 to each of the processing heads 12, 13, 14, and 15. Further, between the first fine grinding device 7 and the second fine grinding device 8, a medium thickness measuring unit 16 is provided.

FIG. 2 shows the structure of the medium meat measuring unit 16. The cylindrical holding ring 17 is provided with an insertion hole 17c for inserting the sticking plate 2 on which the first surface of the already-ground lens material 1 is stuck. This holding ring 17 is fixed to a turntable 18. The turntable 18 is a stepping motor (or a servo motor) 1 as a rotation driving means.
9 is held on the rotating shaft 19a. A holding ring 22 is provided at a position symmetrical with respect to the axis f of the rotation shaft 19a. The holding plate 22 has a sticky plate 2 on which a mastery lens 20 having a medium thickness of a predetermined standard is stuck.
An insertion hole 22c for inserting the first hole 1 is formed. The holding ring 22 has the same shape and the same dimensions as the holding ring 17.

The outer surfaces of the upper surfaces of the holding rings 17 and 22 are in contact with a contact surface 17 which contacts a positioning ring 29 described later.
a and 22a. A stepped portion stands on the inner side of the contact surfaces 17a and 22a, and the outer peripheral surface of the stepped portion has a positioning surface 17b, 2
2b.

The above-mentioned sticking plates 2 and 21 are made of lens material 1 and
Attachment surface 2 to which master lens 20 is attached
b and 21b protrude to the center, and flange-like reference surfaces 2a and 21a extend in the horizontal direction at positions lower than the sticking surfaces 2b and 21b. Reference surface 2
Reference numerals “a” and “21a” serve as reference points when the medium meat is measured.

The stepping motor 19 includes an arm 23
The arm 23 is held by a linear guide 24 fixed to a support 25 so as to be vertically movable. This vertical movement is performed by an air cylinder as a straight driving means not shown. The arm 23, the stepping motor 19, the turntable 18, the holding ring 17,
22 and the sticking plates 2 and 21 constitute the lens holding unit 32.

On the other hand, a detection scale 26 made of a magnetic scale or an optical scale is disposed above and opposite to the holding ring 17. In this embodiment, a magnetic scale is used as a detection scale. The center axis h of the detection scale 26 is
With the central axis g of At the tip of the detection scale 26, a measuring terminal 27 is held in a state in which it coincides with the central axis h.

The lower end surface 27a of the measuring terminal 27 has a planar shape. The lower end surface 27a is changed depending on the shape of the lens material 1. In the case of the concave lens material 1 or the planar lens material 1, it has a needle shape or a spherical shape.

An arm 49 is provided on the column 25 in the horizontal direction, and the outer peripheral portion 26a of the detection scale 26 is slidably held vertically through the arm 49.
The amount of movement is such that the upper surface of the projection 26b of the detection scale 26 and the lower surface 49b of the arm 49 come into contact with each other from the position where the upper surface 49a of the arm 49 and the ring 28 fixed to the outer peripheral portion 26a of the detection scale 26 come into contact. Up to the position.

Outside the measuring terminal 27, a cylindrical positioning ring 29 is provided. This positioning ring 29
Is a screw portion 26 on the lower side of the projection 26b of the detection scale 26.
It is fastened to the detection scale 26 by c. The central axis of the positioning ring 29 coincides with the central axis h of the detection scale 26.

A step is formed at the lower end of the positioning ring 29, and the inner peripheral surface of the step forms a positioning surface 29 b that fits with the positioning surfaces 17 b and 22 b of the holding rings 17 and 22. As will be described later, the center axes of the holding rings 17 and 22 and the detection scale 2
6 coincides with the central axis h. In addition, the tip surface of the step portion is a contact surface 29a that contacts the contact surfaces 17a and 22a of the holding rings 17 and 22.

The electric signal measured by the detection scale 26 is transmitted to an alarm 16 provided adjacent to the medium measurement unit 16 via a medium operation unit 16a having a medium operation circuit.
b and is sent to the processing head 12 of the CG processing device 6. In the processing head 12 of the CG processing apparatus 6, FIG.
As shown in FIG. 2, the machining head 12 is connected to a servo motor or stepping motor control device 6a (see FIG. 2) for feeding the workpiece shaft 31 in the axial direction of the central axis i. At the tip of the work shaft 31, a chuck 30 for holding the sticking plate 2 on which the lens material 1 is stuck by suction or opening and closing is provided.

FIG. 3 is a flowchart of the control of the automatic lens processing line of this embodiment, and the operation will be described based on this flowchart. The transfer between the conveyor 11 and each of the processing heads 12, 13, and 14 or the transfer to the filling measuring unit 16 on which the lens material 1 is stuck is performed by a transfer device such as a robot (not shown).

(1) Supply of lens material The robot 4 of the stocker 3 puts the lens material 1 stuck on the sticking tray 2 with an adhesive from the pallet 5 onto the belt conveyor 10, so that the lens material 1 is transferred to the belt conveyors 10, 11. Is transferred to the CG processing device 6 via the.

(2) CG processing The robot holds the sticking plate 2 from the conveyor 11 and transfers it to the chuck 30 of the work shaft 31 of the processing head 12 so that the sticking plate 2 is held by the chuck 30 as shown in FIG. Then, the lens material 1 is subjected to CG processing by a cup-shaped diamond grindstone.

(3) Fine grinding 1 After the CG processing, the robot transfers the sticking plate 2 from the chuck 30 to the conveyor 11, and then the sticking plate 2 is moved to the belt conveyor 1.
1, and then the sticking plate 2 is transferred by a robot to the fine grinding head 13 of the first fine grinding device 7,
The lens head 1 is processed by the processing head 13 using a spherical metal bond diamond pellet. Generally, the allowance is 20 to 70 μm. This allowance is CG
The roughness of the processed surface and the internal cracks vary depending on the bond material and mesh of the grindstone used for processing, and are set at 20 to 70 μm to remove them.

(4) Measurement of Medium Mesh The lens material 1 that has been subjected to the copying process is transported by a robot while being attached to the attachment plate 2. And
The sticking plate 2 is mounted on the holding ring 17 and the thickness of the lens material 1 is measured. The measurement of the master lens 20 is performed prior to the measurement of the thickness of the lens material 1.

The measurement of the master lens 22 is performed by first rotating the turntable 18 by the stepping motor 19, and the center axis of the holding ring 22 on the side of the sticking plate 21 on which the master lens 20 is stuck and the center axis h of the detection scale 26. The turntable 18 stops at a position where the position and the position coincide with each other. Then, the master lens 20 is air blown by an air supply device (not shown), and the entire lens holding portion 32 supported by the linear guide 24 is moved upward by an air cylinder (not shown).

At this time, as shown in FIG. 5, the contact surface 22a of the holding ring 22 and the contact surface 29 of the positioning ring 29
a, and the positioning ring 29 is connected to the upper surface of the projection 26 b of the detection scale 26 and the lower surface 49 b of the arm 49.
And rises to the position where it comes into contact with and stops. At this time, using the positioning surface 22b of the holding ring 22 as a guide, the positioning surface 29b of the positioning ring 29 fits with the positioning surface 22b of the holding ring 22. The center axis h of the detection scale 26 is positioned.

FIG. 5 shows a measurement state of the master lens 20.
The dimension H ₀ from a to the top of the surface of the master lens 20 is measured, and the measured value is sent to the medium thickness calculating device 16a. Note that this measurement can also be performed during an idle time before the lens material 1 is inserted into the holding ring 17.

This dimension H ₀ and the reference surface 21 of the sticking plate 21
a to the top of the pasting surface 21b of the pasting plate 21
And the relationship between the master lens 20 and the medium thickness L ₀ is given by the following equation: H ₀ = L ₀ + S (1) L ₀ and S are input to the arithmetic unit 16a in advance. Here, the medium thickness L ₀ of the master lens 20 is set according to the allowance for the fine grinding process 2 (set by the bond type and mesh of the diamond pellet in the fine grinding process 1).
This is the dimension obtained by adding the allowance for the polishing process (also set by the type of diamond pellet bond and the mesh in the fine grinding process 2) to the inner thickness of the product.

After the measurement of the master lens 20 is completed,
The lens holding unit 32 is moved downward by an air cylinder not shown. Next, the turntable 18 is rotated by the stepping motor 19. This rotation is performed by holding ring 17 into which sticking plate 2 to which lens material 1 is stuck is inserted.
Stops at a position where the center axis of the detection scale 26 coincides with the center axis h of the detection scale 26. Then, the lens material 1 is air blown by an air supply device (not shown), and the entire lens holding portion 32 supported by the linear guide 24 is moved upward by an air cylinder (not shown).

At this time, the contact surface 17a of the holding ring 17 and the contact surface 29a of the positioning ring 29 are in contact with each other.
6b is raised to a position where the lower surface 49b of the arm 49 comes into contact with the lower surface 49b, and stops. In this case, the positioning ring 17 is used as a guide with the positioning surface 17b of the holding ring 17 as a guide.
Of the retaining ring 17
The center axis of the holding ring 17 and the center axis h of the detection scale 26 are positioned by this fitting.

Then, similarly to the measurement of the master lens 20 shown in FIG.
Is measured by the detection scale 26, and the measured value is sent to the medium thickness measuring device 16a.

The relationship between the dimension H, the dimension S from the reference surface 2a of the sticking tray 2 to the top of the sticking surface 2b of the sticking tray 2, and the thickness L of the lens material 1 is as follows: H = L + S (2 ) Equation Here, the sticking plate 2 and the sticking plate 21 have the same shape,
Since the same size is used, the reference surface 2
The dimension S is equal from a, 21a to the top of the attachment surfaces 2b, 21b. Therefore, from the expressions (1) and (2), the difference ΔL between the lens material 1 and the medium thickness of the master lens 20 is represented by ΔL = L−L ₀ (3)

The alarm 16b sounds when the measured difference ΔL of the medium thickness obtained by the medium operation circuit of the medium operation device 16a exceeds the standard. Prevents flow to subsequent processes. That is, when the difference ΔL of the medium thickness exceeds the standard, after the lens holding unit 32 is moved downward by the air cylinder, the robot that moves in response to the alarm signal stores the lens material 1 and the sticking plate 2 in the defective storage. (Not shown) and is prevented from flowing to a subsequent process.

(5) Medium Weight Calculation, Automatic Correction When a difference ΔL in the medium weight of the master lens 20 occurs, the medium weight calculation device 1
6a outputs a signal of the difference ΔL to the control device 6a that controls the CG processing device 6 directly (or via the control device of the automatic processing line). Thereby, the control device 6a automatically corrects the machining end position of the work shaft 31 by ΔL. In other words, based on the signal from the medium thickness calculating device 16a, the control device 6a sets the workpiece shaft 31 to finish machining at the forward position when the value is positive and the retracted position when the value is negative.

(6) Fine Grinding 2 After the measurement of the inside thickness of the lens material 1, if the inside thickness L of the lens material 1 is within the standard, the lens material 1 attached to the attachment plate 2 is attached to the holding ring 17.
Are then taken out by a robot, then conveyed by a belt conveyor 11 and transferred to a processing head 14 of a second fine grinding apparatus 8. Then, the lens head 1 is processed by the processing head 14 using a spherical resin bond diamond pellet. Generally, the allowance is 5 to 20 μm. This removal allowance is set to remove the roughness of the processed surface and the internal cracks depending on the bonding material and mesh of the diamond pellet used in the fine grinding process 1.

(7) Polishing After completion of the copying, the lens material stuck on the sticking plate 2 is taken out by a robot, then conveyed by a belt conveyor 11, and transferred to a processing head 15 of a polishing machine 9 by a robot. The polishing is performed by the processing head 15 while receiving the supply of water with a spherical resin-bonded cerium oxide grindstone or the supply of a polishing liquid containing cerium oxide or the like with a spherical tool to which a polishing sheet is attached. Generally, the allowance is 1 to 5 μm. Bond material for diamond pellets used in precision grinding process 2,
The roughness of the machined surface and the internal cracks are different depending on the mesh, and a margin is set to remove them.

(8) Storage of Finished Product After the polishing process, the lens material 1 stuck on the sticking tray 2 is taken out by a robot, then conveyed by a belt conveyor 11, and the finished product is put on a pallet 5 by a robot 4 of a stocker 3. To be stored.

According to such an embodiment, the medium thickness is automatically measured and the processing conditions are corrected. Therefore, even when processing into a lens material having a strict accuracy of the medium thickness, manual sampling measurement and processing conditions are required. It is no longer necessary to correct
There is no need to pause the automatic processing line. Therefore, the cycle time can be reduced, the number of lines can be increased, and the cost of the lens can be reduced.

In the item (5), the calculation and the automatic correction, the average value of the difference ΔL between the master lens 20 and the medium is calculated after measuring a large number of lens materials 1, and the value is calculated. Can be automatically corrected as a change in the processing end position of the work shaft 31 of the CG processing device 6. At this time,
Eliminating sudden changes in the value from the previous average value to prevent an erroneous correction of an error during the measurement of the medium thickness (for example, when a foreign material is attached to the processed surface of the lens material 1). Can be.

The medium-measuring unit 16 is arranged between the second precision grinding device 8 and the polishing device 9, and the medium is measured after the fine grinding process 2, and the work of the CG machining device 6 is measured. Automatic correction may be performed on the axis 31. At this time, although a slight time lag occurs, an accurate medium correction can be performed in consideration of the variation in the allowance for the fine grinding process 2.

Further, in the automatic lens processing of CG processing in which the precision grinding processing 1 and the precision grinding processing 2 are integrated into one, the precision grinding processing and the polishing processing, the medium thickness measurement is performed after the precision grinding processing and the CG processing is performed. The processing end position of the processing work axis can be corrected. In this case, since the allowance of the post-process is only the polishing process and the pre-process is only the CG process, the medium thickness control can be performed with high accuracy.

(Embodiment 2) FIGS. 6 to 9 show Embodiment 2, and FIG. 6 is a partially cutaway front view of a lens holding device for holding a lens material by copying on an automatic lens processing line. FIG. 8 is a perspective view showing the skeleton of FIG. 6, FIG. 8 is a plan view of an automatic lens processing line, and FIG.

FIGS. 6 and 7 show a lens holding device 40 for holding the lens material 1 and the attachment plate 2 of the processing heads 13, 14, and 15 in FIG. Lens holding device 40
Are fixed to the respective processing heads 13, 14, 15.

The lens holding device 40 is rotatable around the axis of the first support shaft 42 via the first support shaft 42 via the first support shaft 42 at the lower end side of the stay member 41 for supporting the processing pressure applied during the copying process. And a upper arm 45 attached to the seesaw plate 44.

As shown in FIG. 7, the seesaw plate 44 is
The arm portions 44a and 44b on both sides of the first support shaft 4
It extends forward than 2. The upper arm 45 is rotatably supported around the second support shaft 43 via the second support shaft 43 at the distal ends of the arm portions 44 a and 44 b on both sides of the seesaw plate 44. At this time, the second support shaft 43 is provided along an axis y orthogonal to the axis x of the first support shaft 42.

The upper arm 45 extends upward from the second support shaft 43 and is formed in a U-shape connecting the arm portions 44a and 44b. The sticking plate 2 is provided at the center of the horizontal portion 45a. It is rotatably held via a bearing 46. The lens plate 1 is attached to the attachment plate 2, and the center axis z of the attachment plate 2 coincides with the axis x of the first support shaft 42.

As shown in FIG. 8, the medium meat measuring unit 16
Is provided in the first precision grinding device 7 for performing the precision grinding 1, and is arranged so as to measure the medium thickness before and after the precision grinding 1 by a transfer device (robot) (not shown). .

FIG. 9 is a flowchart for performing lens processing according to this embodiment, and a description of the same processing as in the first embodiment will be omitted.

(1) Supply of lens material and (2) CG processing are the same as in the first embodiment.

(3) Measurement of Meat Thickness Before the fine grinding process 1 (that is, after the CG process), the thickness L ₀ of the master lens 20 and the thickness L ₂ of the lens material 1 are measured as in the first embodiment. I do.

(4) Machining allowance calculation When the machining allowance in the fine grinding process 1 of the preceding lens material 1 immediately before the lens material to be machined is K ₁ and the machining time is T ₁ , the machining speed V ₁ is: V ₁ = K ₁ / T ₁ (4) The middle thickness for processing with high accuracy, the difference between the medium thickness L ₂ of the middle thickness L ₀ and the lens material 1 of the master lens 20 △
L ₂ only may be carried out precision grinding 1. Therefore, the processing time T ₂ for this is given by T ₂ = △ L ₂ × V ₁ (5)

(5) Fine Grinding 1 The lens material 1 and the sticking plate 2 after the CG processing are held by the lens holding device 40 by a transfer device (robot) (not shown), and copying is performed with metal bond diamond pellets. Processing time at that time is controlled to machining time T ₂ calculated in Equation (5).

(6) Measurement of the fill of the medium After the fine grinding 1, the fill L of the lens material 1 is obtained._ThreeMeasure
You. Where L₀And L _ThreeDifference ΔL_ThreeIs beyond standard
In this case, the alarm 6b sounds and operates as in the first embodiment.
Prevents defective lens material 1 from flowing to subsequent processes
You.

[0087] (7) the processing rate calculation before step medium thickness measurement measured medium thickness difference △ L ₂ and at (6) by medium thickness difference △ L ₃ measured in medium thickness measurement section of fine grinding 1 The allowance K ₂ is given by the following equation: K ₂ = △ L _2- △ L ₃ (6) The processing speed V ₂ of the current precision grinding process 1 is given by the following equation: V ₂ = K ₂ / T ₂ (7) Therefore, the next fine grinding 1 of the lens material 1
Assuming that the difference between the medium meats is ΔL ₄ , the processing time T ₃ is as follows: T ₃ = ΔL ₄ × V ₂ (8) The machining time T _3, to the processing time for the fine grinding of the following lens blank 1, for automatically correcting the time T ₁ as described above to T ₃ (i.e., the allowance operation this T ₃ will be treated as T _1).

In the subsequent flow, similarly to the first embodiment, (8) fine grinding 2, (9) polishing, and (10) finished product storage are performed.

According to such an embodiment, the inner material is measured before the fine grinding, and the processing time is set based on the processing speed of the lens material 1 before the fine grinding. Even if the processing is performed, more accurate automatic correction of the meat can be performed.

In this embodiment, fine grinding 1
However, the same is also possible in the fine grinding process 2. By combining the method with the method of feeding back the measured value of the fillet of the fine grinding process 1 of the first embodiment to the CG process, the processing time can be reduced. Variation is minimized, and cycle time is reduced.

[0091] Further, since the automatic filling processing can be performed in the fine grinding process, the same effect can be obtained not only by the automatic lens processing line but also by the fine grinding apparatus alone.

As an application of this embodiment, the dimension S from the reference surface 2a of the sticking plate 2 for sticking the lens material 1 to the top of the sticking surface 2b is measured for all the sticking plates 2 ( _{S 1, S 2, S 3} , ...), the difference between the dimension S ₀ of the specification center _{△ S (△ S 1, △} S 2, △ S 3, ...) added value to the operation of the machining allowance of (K _{1 = L 2 -L 0 ± △ S} ). And
The error from the reference surface 2a to the pasting surface 2b of the pasting plate 2 can be canceled by storing the ΔS of each pasting plate 2 and performing the lens automatic processing in that order. As a result, it is possible to perform a more accurate medium meat automatic correction process.

(Embodiment 3) FIGS. 10 to 14 show Embodiment 3, FIG. 10 is a plan view of an automatic lens processing line, and FIG. 11 is a front view of a series of processing steps of the automatic lens processing line. 12 is a side view of the medium-measuring unit, FIG. 13 is a flowchart of automatic medium-mesh correction processing, and FIG. 14 is a cross-sectional view during medium-measurement.

In FIG. 10, a stocker 3 is a unit for storing a finished product after the supply and centering of the lens material 1 is completed. The robot 4 attached to the stocker 3 supplies the lens material 1 from the pallet 5 storing a large number of the lens materials 1 and stores the finished product. The CG processing device 6 performs CG processing by the processing heads 52 and 53. The fine grinding apparatus 50 includes the processing head 5
4, 55. The polishing device 9 performs polishing by the processing heads 56 and 57. The centering device 51 performs centering by the processing head 58.
The belt conveyor 10 is moved from the stocker 3 to the CG processing device 6.
The lens material 1 is conveyed to the lens material. The belt conveyor 11
Each processing head 52, 53, 54, 55, 56, 57, 5
8. The lens material 1 is conveyed. In addition, the fine grinding device 5
A medium measurement unit 59 is provided at 0.

As shown in FIG. 12, the lens material 1 is held by a cylindrical holding ring 61, and the measurement of the inner thickness is performed. That is, in this embodiment, the lens material 1
Indicates the measurement of the meat content in a state where the meat is not stuck on the sticking plate 2.

The holding ring 61 has a hollow shape, and an edge portion of an inner portion formed in a ring shape becomes a supporting edge portion 61c which comes into contact with the A surface a of the lens material 1, while
The outer peripheral surface of the outer portion is a positioning surface 61b that is fitted with a measurement ring 62 described later to perform relative positioning. The holding ring 61 sucks the lens material 1 from a suction hole 61a by a vacuum device (not shown). The holding ring 61 is vertically movably held by the linear guide 24 via the arm 23. The linear guide 24 moves in the vertical direction along the column 25, and this vertical movement is performed by an air cylinder (not shown) serving as a linear drive unit. In such an embodiment, the arm 23 and the holding ring 61 constitute the lens holding portion 63.

On the other hand, above the holding ring 63, a medium measuring unit 59 is provided. Medium meat measurement unit 5
9 has a detection scale 60 made of a magnetic scale, and the center axis k of the detection scale 60 and the center axis j of the holding ring 63 coincide with each other. A measurement ring 62 is held at the lower end of the detection scale 60. The detection scale 60 is held by an arm 49 fixed to the column 25.

The inner surface of the measuring ring 62 is formed so as to be stepped from the inner side to the outer side, and the inner peripheral surface of the outermost step is fitted with the positioning surface 61 b of the holding ring 63. It is a positioning surface 62b. The innermost edge portion is a contact edge portion 6 that contacts the lens material 1.
2c.

The electric signal of the detection scale 60 is supplied to the processing head 53 of the CG processing apparatus 6 shown in FIG. That is, the detection scale 60 has a chuck 7 for holding the lens material 1.
The workpiece is connected to a control device (not shown) for controlling a feed end position in a direction parallel to the central axis of the work shaft 71 having 0.

FIG. 13 is a flowchart for processing the lens of this embodiment. In this embodiment, the convex surface a of the lens material 1 is the surface A, and the concave surface b is the surface b.
Will be described as the B side.

(1) Lens Material Supply The robot 4 of the stocker 3 conveys the lens material 1 from the pallet 5 to the CG processing device 6 via the belt conveyors 10 and 11.

(2) A-side CG processing The lens material 1 is held by the chuck 70 of the processing head 52, and the lens material 1 is
A is subjected to CG processing (FIG. 11A).

(3) B-side CG processing The lens material 1 is held by the chuck 72 of the processing head 53, and the lens material 1 is
CG processing is performed on the B surface (FIG. 11B).

(4) A-side fine grinding process The fine grinding device 5 transported by the belt conveyor 11
This is performed by the zero processing head 54. In this processing, the surface A is finely ground by a spherical fine grinding tool 77 to which a spherical diamond pellet 76 is attached (FIG. 11).
(C)).

(5) Surface B Fine Grinding Work is performed by the processing head 55 of the fine grinding machine 50. In this processing, the surface B is finely ground by a spherical grinding tool 79 to which a spherical diamond pellet 76 is attached (FIG. 11D).

(6) Measurement of Medium Weight The master lens is placed on the holding ring 61 in advance. The surface A of the master lens is sucked from the suction hole 61a of the holding ring 61 by a vacuum device (not shown), and
The surface A of the master lens is brought into close contact with 1c. In this state, the lens holding unit 6 is moved by an air cylinder (not shown).
3 moves upward.

As a result, as shown in FIG. 14, the B surface of the master lens comes into close contact with the contact edge 62c formed by the step of the measuring ring 62. At this time, even if the master lens is tilted, it is received from above and below by the orbicular zone near the outer periphery (the contact edge portion 62c and the support edge portion 61c), so that the tilt is corrected. Further, using the outer peripheral surface of the holding ring 61 as a guide, the positioning surface 62b of the measuring ring 62 is fitted to the positioning surface 61b of the holding ring 61, and by this fitting, the center axis j of the holding ring 61 and the center of the detection scale 60 are moved. Axis k
Are positioned.

Then, as shown in FIG. 14, the dimension R ₀ of the supporting edge 61c of the holding ring 61 and the contact edge 62c of the measuring ring 62 is measured by the detection scale 60. This dimension R ₀ is stored. In addition, the thickness of the master lens is determined by the allowance for the polishing of the A and B surfaces (the type of bond of the diamond pellet in the fine grinding process,
(Set by the mesh) is added to the meat size in the product.

After the measurement of the master lens, the lens holder 63 is moved downward by an air cylinder (not shown). This operation is performed before the automatic processing of the lens material 1 is started.

Next, a transfer device (robot) not shown
As a result, the lens material 1 is placed on the holding ring 61. Then, the surface A of the lens material 1 is suctioned from the suction hole 61a of the holding ring 61 by a vacuum device (not shown), and the surface A of the lens material 1 is brought into close contact with the supporting edge 61c. In this state, the lens holding portion 63 is moved upward by an air cylinder (not shown), so that the surface B of the lens material 1 is brought into contact with the contact edge portion 6 of the measurement ring 62 as shown in FIG.
Close contact with 2c. Due to this close contact, the dimension R between the supporting edge 61 c of the holding ring 61 and the contact edge 62 c of the measuring ring 62 is measured by the detection scale 60.

The difference ΔR between the measured dimensions of the lens material 1 and the master lens is given by ΔR = R−R ₀ (9) The fillet L on the optical axis has a radius of curvature R of the surface A.
a, radius of curvature Rb of surface B, diameter Da of support edge 61c of holding ring 61, contact edge 6 of measurement ring 62
When the diameter Db is 2c, L = ｃRa-Ra ^2- (D
a / 2) ² } + R- {Rb-Rb ^2- (Db / 2) ² }
It is.

From this, ΔR is ΔL (the difference between the medium thickness on the optical axis of the master lens and the medium thickness on the optical axis of the lens material).
Is the same as When the measured dimensional difference ΔR exceeds the standard, the alarm 59a is activated to prevent the lens material 1 having the poor thickness from being discharged and flowing to the subsequent process. After this measurement, the lens holder 63 is moved downward by an air cylinder (not shown).

(7) Medium calculation and automatic correction When a difference ΔR from the master lens occurs, a work axis in the CG processing on the B surface of the CG processing apparatus 6 is applied to the lens material 1 to be processed thereafter. △ R at the processing end position of 71
Only automatically correct. That is, in the case of plus, the work shaft 71 is advanced, and in the case of minus, machining is finished at the position where the work shaft 71 is retracted.

(8) B-Surface Polishing Process The wafer B is conveyed by the belt conveyor 11 and is polished by a processing head 56 of the polishing apparatus 9 with a spherical resin-bonded cerium oxide grindstone while applying water thereto. Alternatively, polishing is performed by a spherical polishing tool 82 to which a polishing sheet 81 is attached while receiving a polishing liquid 83 containing cerium oxide or the like (FIG. 11E). Generally, the allowance is 1-5 μm
It is. The roughness of the machined surface and the internal cracks are different depending on the bonding material and mesh of the diamond pellet used for the fine grinding, and the allowance is set to remove them.

(9) A-Surface Polishing Process The polishing head 57 of the polishing device 9 polishes with a spherical resin-bonded cerium oxide grindstone while applying water thereto. Alternatively, polishing is performed by a spherical polishing tool 85 to which a polishing sheet 81 is attached while receiving a polishing liquid 83 containing cerium oxide or the like (FIG. 11F). Generally, the removal margin is 1 to 5 μm, and the roughness of the processed surface and internal cracks differ depending on the bonding material and mesh of the diamond pellet used for fine grinding, and the removal margin is set to remove it. is there.

(10) Centering process The centering device 5 is transported by the belt conveyor 11 and
The centering is performed by holding the lens material 1 between the pair of cup-shaped holders 86 and 87 by the one processing head 58, and rotating the lens material 1 around its center line to remove the side peripheral surface c of the lens material 1. The diamond is ground to a perfect circle with a diamond grindstone 88 (FIG. 11 (g)).

(11) Finished Product Storage The finished product is conveyed by the belt conveyor 11 and stored on the pallet 5 by the robot 4 of the stocker 3.

According to such an embodiment, even in an automatic lens processing line for polishing and centering both surfaces a and b of the lens material 1, the medium thickness is automatically measured and the processing conditions are corrected. This eliminates the need for manual sampling measurement and correction of processing conditions, and also eliminates the need to temporarily stop automatic processing lines, thereby reducing cycle time and increasing the number of lines, thereby reducing lens costs. Can be reduced.

In the calculation and automatic correction of the medium thickness, after measuring several lens materials 1, the average value of the difference ΔR of the medium thickness of the master lens can be calculated and the value can be automatically corrected. It is. At this time, by eliminating sudden changes in the value from the previous average value, it is possible to prevent an erroneous correction of an error at the time of measuring the medium thickness (for example, when a foreign matter is attached to the processed surface of the lens material 1). can do.

When the fine grinding process is divided into two processes, the CG processing device 6 for the surface to be processed after the fine grinding process 2 is used.
May be automatically corrected for the work axis. At this time, although a slight time lag occurs, the medium thickness can be corrected in consideration of the variation in the allowance for the fine grinding process 2.

Further, as described in the second embodiment, after the fine grinding, before the machining of the surface to be machined and before machining, the machining allowance is obtained, and the machining time is obtained from the machining speed immediately before. , Process the next lens material in the processing time, after this processing,
By measuring the filling again, calculating the machining allowance, calculating the processing speed, and performing the filling correction automatically, which is used to calculate the processing time for the next lens material, the accuracy of the filling is further improved. improves.

[0122]

As described above, according to the first aspect of the present invention, the feed of the work axis in the curve generator processing is corrected by the difference between the thickness of the master lens and the thickness of the processed lens material. It is possible to accurately process the middle material of the lens material of the step. For this reason, even during the automatic processing of the lens, it is possible to perform the processing corresponding to the strict medium precision. This eliminates the need for manual sampling measurement and correction of processing conditions, and also eliminates the need to pause automatic processing lines, thereby reducing cycle time, increasing the number of lines held, and reducing lens costs. it can.

According to the second aspect of the present invention, the lens material can be stably fixed, and the processing of the lens material and the measurement of the medium thickness can be performed with high accuracy.

According to the third aspect of the present invention, by displaying an error by an alarm, a lens exceeding the standard can be excluded from the production, and a lens having poor qualification is not brought to the next step.

According to the fourth aspect of the present invention, since the feed of the work axis in the curve generator machining is corrected based on the average value of the difference between the plurality of medium thickness measurements, stable correction can be performed. In addition, by removing a sudden change in the value from the average value, it is possible to prevent an erroneous correction of an error during the measurement of the medium thickness.

According to the fifth aspect of the present invention, the processing time of the lens material is calculated from the difference in the measurement of the thickness of the lens material and the processing speed of the lens material in the preceding stage. To calculate the machining allowance and control the machining speed of the next lens material from this machining allowance and the machining time described above,
The processing time can be set by continuous data for each processing of the lens material, and it is possible to cope with strict medium precision with high precision. This allows for manual sampling measurements,
Since it is not necessary to correct the processing conditions and the automatic processing line is not temporarily stopped, the cycle time can be reduced, the number of lines can be increased, and the cost of the lens can be reduced.

According to the sixth aspect of the present invention, an error display by an alarm prevents a lens having poor eligibility from being brought to the next step.

According to the seventh aspect of the present invention, since the lens holding portion is brought close to the detection scale and the holding ring is fitted to the positioning ring to measure the lens material and the thickness of the master lens accurately, it is possible to accurately measure the thickness of the master lens. Medium meat can be measured. In addition, since the processing amount of curve generator processing is corrected based on the difference of the fill thickness measured by the control means, the fill of the lens material can be controlled during the automatic processing line of the lens, and it corresponds to strict fill accuracy. Processing can be performed.

According to the eighth aspect of the present invention, the holding ring is fitted to the measuring ring while the holding ring holds the lens material and the master lens by vacuum suction, and the lens material and the thickness of the master lens are measured. , Can be measured accurately. In addition, since the control means corrects the amount of curve generator processing based on the measured difference in the fill, the fill of the lens material can be controlled during the automatic processing line of the lens, corresponding to strict fill accuracy. Processing can be performed.

[Brief description of the drawings]

FIG. 1 is a plan view of an automatic lens processing line according to Embodiment 1 of the present invention.

FIG. 2 is a partially cutaway side view of the medium thickness measuring unit according to the first embodiment.

FIG. 3 is a flowchart illustrating a processing procedure according to the first embodiment.

FIG. 4 is a sectional view of a work axis of the CG processing apparatus according to the first embodiment.

FIG. 5 is a cross-sectional view at the time of measuring a medium thickness in the first embodiment.

FIG. 6 is a partially broken side view of a lens holding device used in a second embodiment.

FIG. 7 is a simplified perspective view of a lens holding device.

FIG. 8 is a plan view of an automatic lens processing line according to a second embodiment.

FIG. 9 is a flowchart illustrating a processing procedure according to the second embodiment.

FIG. 10 is a plan view of an automatic lens processing line according to a third embodiment.

11A to 11G are side views showing a processing procedure according to the third embodiment.

FIG. 12 is a side view of a medium thickness measuring unit according to the third embodiment.

FIG. 13 is a flowchart illustrating a processing procedure according to the third embodiment.

FIG. 14 is a cross-sectional view showing a medium thickness measurement in the third embodiment.

FIG. 15 is a plan view of a conventional automatic lens processing line.

16 (a) to (g) are side views showing a conventional processing procedure.

FIG. 17 is a partial front view of a conventionally used spherical center polishing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lens material 2 Lens sticking tray 3 Stocker 6 CG processing device 7 1st precision grinding device 8 2nd precision grinding device 9 Polishing device 16 Medium meat measurement unit

Claims (8)

[Claims] 1. In a lens automatic processing line for automatically performing curve generator processing and fine grinding processing from supply of lens material, a step of measuring the thickness of the master lens and the lens material after the curve generator processing and fine grinding processing. And a step of calculating a difference between the measurement of the medium thickness by the measurement and correcting the feed of the work axis in the curve generator processing. 2. The method according to claim 1, wherein the lens material is attached to an attachment plate. 3. The method according to claim 1, wherein an error is displayed by an alarm when the lens material exceeds a standard in the step of calculating the difference of the medium thickness measurement. . 4. In the step of calculating the difference between the medium thickness measurements, an average value of the differences between the plurality of medium thickness measurements is calculated, and the feed of the work axis of the curve generator machining is corrected based on the calculated value. 2. The method according to claim 1, wherein the lens is processed for correcting the medium thickness of the lens. 5. A lens automatic processing line for automatically performing a curve generator processing and a precision grinding processing from a supply of a lens material, a step of measuring a thickness of the master lens and the lens material after the curve generator processing, A step of calculating a processing time from the measured difference in the medium thickness due to the measurement and a processing speed when the previous lens material is precisely ground, and performing the fine grinding of the lens material with the calculated processing time; A step of measuring the thickness of the lens material that has been subjected to the grinding process; and a processing speed is calculated from the machining allowance derived from the difference in the thickness of the thin material after the fine grinding process and the calculated processing time. A method for automatically correcting lens thickness according to claim 1, wherein the processing speed is used to calculate the processing time of a lens material at the next stage to be ground. 6. The lens automatic processing according to claim 5, wherein in the step of measuring the thickness of the lens material after the fine grinding processing, an error is displayed by an alarm when the lens material exceeds a standard. Medium meat correction processing method. 7. A lens automatic processing line for automatically performing a curve generator process and a precision grinding process from the supply of a lens material stuck to an affixing plate, and a holding ring for holding the affixing plate stuck to the lens material. A holding ring having the same shape as the holding ring and holding a sticking dish on which a master lens is stuck, a rotating table holding the two holding rings around a center axis between the center axes of the two holding rings, A lens holder having rotation drive means for rotating and positioning the turntable; a linear drive means for vertically moving the lens holder; and a lens material and a master lens which are arranged on the center axis of the holding ring so as to face each other. A detection scale for measuring the inner thickness of the detection scale; and a holding scale that is held on the outer peripheral portion of the detection scale and is fitted to the holding ring. A positioning ring for positioning the detection scale with respect to the lens, a medium arithmetic device having a medium arithmetic circuit for calculating a difference between the lens material and the master lens, and a signal from the medium arithmetic device. A controller for correcting the processing amount of the curve generator processing. 8. In a lens automatic processing line for automatically performing curve generator processing and fine grinding processing from supply of lens material, a holding ring for holding the lens material and the spherical portion of the master lens by vacuum suction, Linear drive means for moving up and down; a detection scale which is held opposite to the center axis of the holding ring and measures the thickness of the lens material and master lens; A measuring ring that performs relative positioning with respect to the holding ring and abuts against the lens material on the holding ring and the spherical portion of the master lens; And a curve generator based on a signal from the medium processing device. And a control device for correcting a processing amount of the lens processing.