JPH1034506A - Method and device for centering lens in lens centering machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make centering capable of a lens by only simply applying a pressure in the case of pressurization, and prevent damage in a lens by Teflon, rubber, etc., in the case of confirming centering in one side direction of a pair of cup type jig tools. SOLUTION: In a method of centering a lens 2 centering the lens 2 through an optical axis (both surfaces) of a pair of upper/lower cup type jigs and cutting an external diameter of the workpiece lens 2, the method comprises a process for making vacuum suction capable of the workpiece lens 2 in one side direction of a pair of the cup type jigs 3, process for measuring an eccentric amount of the workpiece lens 2 while performing one turn in a suction conduction, process for calculating a mean value of a low value to a high value of the eccentric amount by a measured value and stopping rotation relating to a rotatable grinding wheel spindle 1 and a process moving by a servo motor to the mean value in one point on a circumference of a grinding wheel in a stopped state of rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for centering a lens, and more particularly, to a method and an apparatus for centering a lens via an optical axis (both sides) of a cup-shaped jig having a pair of upper and lower shafts. .

[0002]

2. Description of the Related Art A recently developed lens centering method is disclosed, for example, in Japanese Patent Publication No. Hei 6-22795 (a lens centering device in a lens centering machine). In this centering method, a ventilation hole is provided in the center of a pair of cup-shaped jigs, the cup surfaces are relatively arranged, and the lens to be processed is sandwiched between the facing surfaces of the cup-shaped jig at a predetermined pressure, and the ventilation holes are provided. The compressed gas is sent to the lens surface to be processed, and the compressed gas is blown out to confirm the centering of the lens. Furthermore, loosening the clamping by the cup-shaped jig, stopping the compressed gas, and clamping again by the cup jig Is an intermittent operation.

Further, the centering device according to the conventional method will be described in detail with reference to FIGS. In the lens centering machine shown in FIG. 6, the lens axis 21 and the bell axis 22 are arranged facing each other,
The centering of the lens to be processed is performed between them to perform centering processing. At the center of the lens shaft 21, a spindle shaft 32 is provided, and a bearing 37 for rotatably supporting the spindle shaft 32 is fixed to a mount, and at the center of the spindle shaft 32 for supplying air to the lens 25 to be processed. A vent 33 is provided. Also spindle 3
A cup-shaped jig 23 having an end surface formed in a cup shape is connected to the tip of 2, and a ventilation hole 40 is formed at the center and connected to the ventilation hole 33 of the spindle shaft 32. Further, the rear end of the cup-shaped jig 24 is connected to the front end of a spindle 36 provided at the center of the bell shaft 22. In addition, one end of each of the air supply pipes 30 and 31 is connected, and the other end is connected to an air supply device to connect to the cup-shaped jig 23,
24 is configured to supply compressed gas. Also,
Between the air supply device and the spindles 32 and 36, a pressure gauge 28 for measuring the air supply pressure of the compressed gas, a detection sensor 27 for detecting the amount of air supply, an air supply valve 29, and the like are provided.

[0004]

As described above, according to the conventional centering method, the optical axis is set by the upper shaft and the lower shaft and the pair of cup-shaped jigs, and more cores can be set by increasing the speed. I was Therefore, it was considered that the optical axis (both sides) required by combining the core of the upper shaft and the core of the lower shaft would come out, so that when the core came out, the mechanism was processed to a predetermined outer diameter. As a result, a lens having a larger R was more likely to be centered, whereas a lens having a smaller R was more difficult to center. In particular, even with a conventional device that detects leakage of compressed gas from a pair of cup-shaped jigs that sandwich a lens to be processed, it is difficult or impossible to obtain a high-quality product with insufficient centering. there were.

[0005] The conventional centering device generally refers to a device for finishing the outer periphery to a predetermined size.
In such an apparatus, it is a condition that the optical system has a center projected on each spherical surface. In order to check whether or not the core is protruded in the spherical shape on both sides, a device for processing a lens via a jig held between the outer circumferences of a pair of cup-shaped jigs has conventionally been used. In this case, it is an absolute condition that the cores of the pair of cup-shaped jigs come out of the pair of cup-shaped jigs in order to determine the core of the lens to be processed. Therefore, depending on the lens, it is difficult to center a lens having a shallow R or a small diameter on both surfaces, and for this reason, a pair of cup-type jigs is sandwiched by light pressure and then the lens is rotated at a high speed. . But,
This conventional high-speed centering device has a drawback in that the spherical surface of the lens is scratched in order to rotate at high speed.

There is a problem to be solved by the present invention in that the conventional problems are solved by improving the conventional centering method and centering device.

[0007]

SUMMARY OF THE INVENTION The present invention has been developed in order to solve the above-mentioned problems, and is directed to centering a lens through the optical axes (both sides) of a pair of upper and lower cup-shaped jigs. A method of centering a lens that cuts the outer diameter of a lens to be processed through a grinding wheel shaft, and a step of enabling vacuum suction of the lens to be processed in one direction on one side of the pair of cup-shaped jigs, Measuring the amount of eccentricity of the lens to be processed while making one rotation in the suction state; calculating the average value of the eccentricity amount from a high value to a low value based on the measured value; Stopping the rotation and moving the servomotor at one point on the circumference of the grindstone whose rotation has been stopped to the average value by using a servomotor. In the offer of
Further, in the centering method, the rotation of the grindstone shaft is stopped, and the lens to be processed is vacuum-adsorbed to the cup-shaped jig and then rotated at a low speed. Further, the numerical value is stored in the computer via the dial and the average value is read. A method of centering a lens in a centering machine, and a method of centering a lens in a lens centering machine in which the rotation of the grinding wheel shaft is continuously and automatically rotated and the dial is set to 0.1 μm or 0.01 μm. Yes, and after confirming with the optical axis, centering the lens in a lens centering machine that rotates while fixing the lens to be processed via the corresponding cup-shaped jig and cuts the outer diameter of the lens to be processed with the grindstone axis Is the way.

The lens centering apparatus according to the present invention is a lens centering apparatus using the optical axis (both sides) of the cup-shaped jig having a pair of upper and lower shafts. Is attached, and the lens to be processed is vacuum-sucked through the cup-shaped jig so as to conform to the conical shape (R shape).
The measurement range is ± 1 mm using a measuring unit of m or 0.01 μm, and the center of the measuring unit is arranged on the center extension line between the grinding wheel axis of the lens to be processed and the lens to be processed. The present invention provides a lens centering device in a lens centering machine, and further, in the centering device, calculates a mean value by recording a high value and a low value of an eccentric amount by rotating a lens to be processed by one rotation. A grinding wheel shaft to be ground beforehand, and about 2 m to the lens to be processed with the grinding wheel shaft stopped
The lens centering device of the lens centering machine according to claim 2, wherein the lens is moved closer to the average position, and the lens to be processed is gradually moved to an average value by a servomotor in this state, and then returned to an original position to check the center. .

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention has a configuration in which the amount of eccentricity can be measured in a state in which a lens to be processed is held on a jig which can be vacuum-sucked in one direction of a pair of cup-shaped jigs while holding a lens to be processed. It can be confirmed by stopping the grindstone shaft from the high value to the average value of the low value, and further moving the grindstone shaft through the grindstone shaft by the servomotor. Therefore, when confirming centering in one direction of a pair of cup-shaped jigs, the lens can be centered by simply applying pressure when applying the pressure, and damage to the lens due to Teflon, rubber, etc. Can be prevented beforehand, and a product superior to the conventional method can be obtained.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lens centering method and a centering apparatus in a lens centering machine according to the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 are principle mechanism diagrams showing a lens centering method of the present invention, wherein 1 is a grinding wheel shaft, 2 is a lens to be processed, 3 and 5 are cup-shaped jigs, and 4 is a dial gauge. (Measuring device) is illustrated.

The principle of the lens centering method of the present invention is that the lens is centered via the optical axes (both sides) of a pair of upper and lower cup-shaped jigs, and the outer diameter of the lens to be processed is cut via the grindstone axis. A method of centering a lens, wherein a step of enabling vacuum suction of a lens to be processed in one side direction of the pair of cup-shaped jigs, and measuring an eccentric amount of the lens to be processed while making one rotation in the suction state And calculating the average value of the low value from the high value of the eccentricity by the measured value, and stopping the rotation with respect to the rotatable grinding wheel axis, on the circumference of the grinding wheel stopped rotating Moving the grinding wheel shaft to the average value at one point with the servo motor, and stopping the rotation of the grindstone shaft and vacuum-sucking the lens to be processed to the cup-shaped jig, and then rotating it at a low speed. , And a number through the dial Is stored in a computer, the average value is read, and the rotation of the grinding wheel shaft is continuously and automatically rotated, and the dial is set to 0.1 μm or 0.01 μm. There is a method of cutting the outer diameter of the lens to be processed with a grindstone shaft while rotating while fixing the lens to be processed through a tool.

That is, according to the lens centering method of the present invention, first, the rotation of the grinding wheel shaft 1 is stopped, and then the lens 2 to be processed is cup-shaped, as in the principle of the mechanism of the lens centering device shown in FIGS. The jig 3 is vacuum-sucked. Next, the lens 2 to be processed is rotated at a low speed, and the dial gauge (measuring device) 4 is rotated.
The average value of the numerical value is stored in a computer (not shown), and the average value is read. Then, after the high numerical value is accurately measured, the processing target lens 2 is stopped toward the grinding wheel shaft 1. At that time, continuous operation can be performed, so that automatic operation is also possible.

Next, a dial having a diameter of 0.1 μm or 0.01 μm in the case of high accuracy is used. Check the core. After confirming the optical axis as described above, the outer diameter of the lens 2 to be processed is cut by the grindstone shaft 1 while being fixed and rotated via the corresponding cup-shaped jig 3.
According to this method, the cup-shaped jig 5 is pressed down so that the lens 2 to be processed is not moved, and the optical axis is confirmed. Therefore, even if Teflon or rubber is used, no scratch is made.

FIG. 3 to FIG. 5 are explanatory schematic views showing a lens centering device of the present invention. The apparatus of the present invention is a centering apparatus for a lens using an optical axis (both sides) of a cup-shaped jig composed of a pair of upper and lower shafts, wherein a vacuum suction device is attached to the cup-shaped jig in one side direction and the cup-shaped jig is attached. The lens to be processed is vacuum-adsorbed so as to conform to the conical shape (R shape), while a separately provided measuring device is used in units of 0.1 μm or 0.01 μm, and the measuring range is adjusted. ± 1 mm, and the center of the measuring instrument is disposed on the center extension line between the grindstone axis of the lens to be processed and the lens to be processed. In the centering device, the lens to be processed is rotated once to decenter. A grindstone shaft for recording the high value and the low value of the amount and calculating the average value and pre-grinding the same, and approx. 2 mm closer to the lens to be processed in a state where the grindstone shaft is stopped. Gradually to servo motor And configured to verify the core back into position after moving to a mean value.

That is, in the lens centering apparatus of the present invention, a cup-shaped jig 3 in one side is used in a pair of cup-shaped jigs.
The lens 2 to be processed is formed in a conical shape in advance to have a sharp angle so as to conform to the R shape. The separately installed dial gauge (measuring device) 4 has a capacity of 0.1 mm.
A 1 μm or 0.01 μm unit measuring device is used, and the measurement range is ± 1 mm. The dial gauge (measuring device) 4 is disposed so that the center of the measuring device is located on the extension of the center point between the grinding wheel shaft 1 of the lens 2 to be processed and the lens 2 to be processed. In this case, the measurement position of the lens 2 to be processed may be opposite to the grinding wheel shaft 1 side. Further, the lens 2 to be processed is rotated once to record the high and low values of the eccentricity, the average value is calculated, the grinding wheel shaft 1 to be ground in advance is stopped, and the lens to be processed in that state is further stopped. The lens 2 to be processed is gradually moved to an average value by the servomotor with the grinding wheel shaft 1 approaching about 2 mm, and then returned to the original position to about 2 mm to check the center.

When the core accuracy is 1 μm, OK
Set to O and perform core measurement again. At this time, when the core is OK, the grindstone shaft 1 rotates to prepare a grinding fluid, and a pair of the other cup-shaped jig 3 is pressed by air pressure to make the outer diameter to a predetermined size. In this case, since one of the pair of cup-shaped jigs 3 is centered by one of the cup-shaped jigs 3, only one of the cup-shaped jigs 3 needs to be pressed. As a result, since the spherical shape of the lens 2 to be processed is not held between the pair of cup-shaped jigs 3 as in the related art, one of the cup-shaped jigs 5 may be made of a material such as Teflon or rubber that is hardly scratched. This means that automation is also possible.

FIG. 5 shows a dial gauge (measuring device) 4.
FIG. 6 is a control block diagram of a measurement part according to FIG. This measurement control is performed by a grinding wheel rotation stopping step of temporarily stopping the rotating grinding wheel → a measuring element moving step of moving the measuring element to the surface to be measured →
One rotation of the work axis to read the measuring taper and break the work axis One rotation of the work axis → Work axis rotation and movement of the work axis to the highest point → Grind the work piece to the center of the measured value of the grinding wheel axis Work extruding process to extrude with the shaft → Grinding wheel return moving process to move the grindstone to the original position → Workpiece single rotation process to read and analyze the measurement data by rotating the work shaft once again → Contact point after confirming the core , And the grinding wheel is rotated again to discharge the grinding fluid.

[0019]

According to the method for centering a lens of the present invention, the lens is centered via the optical axes (both sides) of a pair of cup-shaped jigs on the upper and lower shafts, and the outer diameter of the lens to be processed is cut via a grinding wheel axis. A step of enabling vacuum suction of a lens to be processed in one side direction of the pair of cup-shaped jigs, and the eccentricity of the lens to be processed while making one rotation in the suction state. Measuring, calculating the average of the low to high values of the amount of eccentricity by the measured values, and stopping the rotation with respect to the rotatable grinding wheel axis, and the circumference of the grinding wheel having stopped rotating Moving the grinding wheel shaft to the average value at the above one point with the servo motor, and stopping the rotation of the grindstone shaft and vacuum-adsorbing the lens to be processed to the cup-shaped jig, and then rotating at a low speed. Let the number through the dial The average value is read by storing it in a computer, and the rotation of the grinding wheel shaft is continuously and automatically rotated and the dial is set to 0.1 μm or 0.01 μm. It is configured to cut the outer diameter of the lens to be processed by the grindstone axis while rotating while fixing the lens to be processed through, so when confirming the centering in one side direction of a pair of cup type jigs , Iron or BSBM _{2 for} cup type jig
However, since the confirmation of the core in one direction has been completed, it is sufficient to press and rotate the lens, and a material such as Teflon or rubber which does not easily damage the lens may be used. Therefore, conventionally, an oil-based cutting fluid has been used, but in the present invention, a water-soluble cutting fluid can be used, so that a lens which is easily damaged can be machined without being damaged.

The centering device of the present invention is a lens centering device using the optical axis (both sides) of a cup-shaped jig comprising a pair of upper and lower shafts, wherein a vacuum suction device is attached to the one-sided cup-shaped jig. In addition, the lens to be processed is vacuum-sucked through the cup-shaped jig so as to conform to the conical shape (R shape), while a separately provided measuring device is provided with a measuring device in units of 0.1 μm or 0.01 μm. The measuring range is set to ± 1 mm when used, and the center of the measuring device is disposed on an extension of the center between the grindstone axis of the lens to be processed and the lens to be processed. The high and low values of the amount of eccentricity are recorded, and the average value is calculated and the average value is calculated. The grinding wheel axis is preliminarily grounded. The lens to be processed It is possible to provide a device to check the core gradually returned to the original position after moving to a mean value in the motor. Therefore, a product superior to the conventional device can be obtained by a simpler mechanism with higher performance than the conventional device.

[Brief description of the drawings]

FIG. 1 is a mechanism diagram of a basic principle showing a lens centering method of the present invention.

FIG. 2 is a mechanism diagram of a basic principle showing a lens centering method of the present invention.

FIG. 3 is a schematic diagram of a mechanism showing a lens centering device of the present invention.

FIG. 4 is a schematic diagram of a mechanism showing a lens centering device of the present invention.

FIG. 5 is a measurement control block diagram of the lens centering device of the present invention.

FIG. 6 is an explanatory schematic diagram showing a conventional lens centering device.

FIG. 7 is an explanatory schematic diagram showing a conventional lens centering device.

FIG. 8 is an explanatory schematic diagram showing a conventional lens centering device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Whetstone axis 2 Lens to be processed 3, 5 Cup type jig 4 Dial gauge (measurement instrument) 21 Lens axis 22 Bell axis 23, 24 Cup type jig 25 Lens to be processed 26 Binion 27 Pressure sensor 28 Pressure gauge 29 Air supply valve 30, 31 Air line 32, 36 Spindle 33, 39, 40, 41 Vent hole 34, 35 Gear 38 Bearing

Claims (6)

[Claims] 1. A lens centering method for centering a lens via an optical axis (both sides) of a pair of upper and lower shaft cup-shaped jigs and cutting an outer diameter of a lens to be processed via a grindstone axis. A step of enabling vacuum suction of the lens to be processed in one direction of the pair of cup-shaped jigs, a step of measuring the amount of eccentricity of the lens to be processed while making one rotation in the suction state, A step of calculating the average value of the low value from the high value of the eccentric amount and stopping the rotation with respect to the rotatable grinding wheel axis, and up to the average value at one point on the circumference of the grinding wheel whose rotation has been stopped. Moving the lens with a servomotor. 2. In the centering method, the rotation of the grindstone shaft is stopped and the lens to be processed is vacuum-adsorbed to a cup-shaped jig and then rotated at a low speed. Further, the numerical value is stored in a computer via a dial and averaged. 2. A method for centering a lens in a lens centering machine according to claim 1, wherein the value is read. 3. The method for centering a lens in a lens centering machine according to claim 1, wherein the rotation of the grinding wheel shaft is continuously and automatically rotated, and the dial is set to 0.1 μm or 0.01 μm. 4. The method according to claim 1, wherein the outer diameter of the lens to be processed is cut by a grindstone axis while rotating while fixing the lens to be processed via a corresponding cup-shaped jig after confirming the optical axis.
And a lens centering method in the lens centering machine according to 3. 5. A centering device for a lens using an optical axis (both sides) of a cup-shaped jig having a pair of upper and lower shafts, wherein a vacuum suction device is attached to the one-sided cup-shaped jig and the cup-shaped jig is attached. The lens to be processed is vacuum-adsorbed so as to conform to the conical shape (R shape), while a separately provided measuring device is used in units of 0.1 μm or 0.01 μm, and the measuring range is adjusted. A lens centering device in a lens centering machine, wherein the distance is ± 1 mm, and the center of the measuring device is disposed on a center extension line between a grinding wheel axis of the lens to be processed and the lens to be processed. 6. In the centering device, a grinding wheel shaft for rotating the lens to be processed by one rotation, recording a high value and a low value of the amount of eccentricity, calculating an average value and grinding in advance, and 6. The lens according to claim 5, wherein the stopped lens is brought close to the lens to be processed by about 2 mm in a stopped state, and the lens to be processed is gradually moved to an average value by a servomotor in this state, and then returned to its original position to check the center. A lens centering device in a lens centering machine.