JPH06297315A - Optical part working device - Google Patents

Abstract

PURPOSE:To enable polishing work to be always carried out at a predetermined constant pressing force by detecting the working pressure of an optical part between the optical part and a grinding wheel by means of a sensor, and by carrying out the working of the optical part while controlling the working pressure by a pressurization regulating part on the basis of the detected output. CONSTITUTION:A piston 15 inside a cylinder 10 for elevating or lowering an upper stem is lifted by air pressure, and the upper stem 8 is lifted through a pressurization cylinder 9 and a slider 31, and a work 6 to be worked is suction-held by a holder 7. Then, the piston 15 is lowered so that the work 6 is abutted on a grinding wheel 5, and after a working rod 29 has been relatively raised inside the upper cylinder chamber 23 of a downward pressurizing cylinder 18, a downward force is applied to a downward pressurizing piston 21 for pressing the work 6 against the grinding wheel 5, grinding work is carried out. At that time, the pressurizing force received by a sensor 35 that has been provided to the lower end of the upper stem 8 is detected, and this is analyzed by a control part 37, and the supply or discharge of air to the pressurization cylinder 9 is controlled through an electropneumatic regulator 38 for maintaining the pressing force constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical component processing apparatus, and more specifically, it is equipped with a grindstone at the upper end of a lower shaft rotatably driven in the lower shaft and at the lower end of the upper shaft. The present invention relates to an optical component processing apparatus that processes an optical component by abutting and pressing the held optical component against the grindstone.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for processing an optical component by equipping the lower shaft portion with a grindstone as described above and abutting and pressing an optical component held by the upper shaft portion against the grindstone, It is disclosed in JP-A-61-188064.

FIG. 3 is a schematic block diagram showing the above-mentioned optical component processing apparatus of the prior art. This optical component processing apparatus has a lower shaft 44 to which a grindstone 43 is fixed at its upper end and which is rotatably driven. An upper shaft 49 that is provided with a portion 41, has a holding portion 47 for the optical component 46, and is held by a linear guide 48 so as to be able to move up and down;
The optical component 46 held by the holding portion 47 when processing the upper shaft 49
An upper shaft portion 45 having a pressing operation portion 51 for pressurizing the grindstone 43 is provided above the lower shaft portion 41.

In the above-described optical component processing apparatus, the lower shaft portion 41 that drives the optical component 46 held by the holding portion 47 by rotating the lower shaft portion 41 by lowering the raising / lowering operation portion 50. The optical component 46 is pressed against the grindstone by the pressing operation portion 51, and the optical component 46 is processed. As described above, by separating the raising / lowering operation unit 50 and the pressurizing operation unit 51, a smooth raising / lowering operation of the upper shaft portion 45 can be performed and a regulator (not shown) regardless of the processing pressure of the optical component. By setting the pressure of), it is possible to set a wide range of processing pressures from low pressure to high pressure necessary for processing small-diameter optical components.

[0005]

However, the above-mentioned conventional optical component processing apparatus has the following problems. (1) When polishing the optical component 46, the fluctuation of the pressing force during processing is one of the main parameters that affect the quality of the processed lens.
The quality of the processed lens, especially Newton quality of the processed lens, is affected by the optical component 4
6 needs to be pressed against the grindstone 43 by a constant pressure, but in the above-described conventional configuration, due to the rotation and swing of the lower shaft 44 during the polishing process, the movement of the upper shaft 49 and the holding portion 47, etc., The contact amount of the optical component 46 and the grindstone 43 changes,
It has been difficult to pressurize the optical component 46 with a constant pressure.

(2) The pressure of the optical component 46 applied to the grindstone 43 and the pressure of the air controlled by a regulator (not shown) are calibrated using a load cell or the like, which is summarized as a calibration table. There was a problem that the first calibration table became unusable due to the progress and the usage situation and the measurement had to be performed again in the same manner as above.

(3) In the above conventional calibration, the pressure applied to the grindstone 43 of the optical component 46 is calculated from the pressure of air whose pressure is controlled by a regulator or the like (not shown) based on the calibration table of (2) above. Therefore, the set pressure of the regulator, that is, the pressing force to be given to the optical component 46 may not be accurately transmitted by the sliding resistance of the members such as the linear guide 48, and the pressing force is indirectly. However, there is a problem that it is impossible to judge whether the value is the set value or not.

The present invention has been made in view of the above-mentioned problems of the prior art, eliminates the need to calibrate the supply air pressure and the pressure applied to the grindstone of the optical component, and reduces the processing pressure of the optical component. Despite the fact that the upper shaft can be smoothly moved up and down, it can set a wide range of processing pressure from the minute processing pressure to the high pressure processing pressure required for processing small-diameter optical parts. It is an object of the present invention to provide an optical component processing apparatus in which, when the processing pressure deviates from the set pressure, the deviation is automatically corrected and polishing processing can always be performed with a set constant pressure.

[0009]

In order to achieve the above object, an optical component processing apparatus of the present invention holds a lower shaft portion equipped with a grindstone so as to be rotationally driven and an optical component which is a workpiece. An upper shaft part having an upper shaft having a holding part, an elevating and lowering operation part for elevating and lowering the upper shaft, and an optical component held by the holding part is pressed against the grindstone when the upper shaft is lowered. A pressure operation unit for, a sensor for detecting the pressure of the pressure operation unit, and analyzing the output signal from the sensor,
The control unit calculates and the pressure adjusting unit adjusts the pressing force of the optical component to the grindstone based on the output signal from the control unit.

[0010]

According to the above construction, the pressure detected by the pressing operation section, that is, the processing pressure of the optical component between the optical component and the grindstone is detected by the sensor. Then, according to the output signal from the sensor, the processing pressure can be controlled by the pressure adjusting unit via the control unit to process the optical component, and the processing pressure of the optical component is always constant according to the set pressure. be able to.

[0011]

1 is a sectional view showing an embodiment of an optical component processing apparatus according to the present invention, and FIG. 2 is an enlarged front view of a portion A in FIG. The optical component processing apparatus 1 according to this embodiment includes a lower shaft portion 2 and an upper shaft portion 3.

The lower shaft portion 2 is a lower shaft 4 which is rotatably supported.
And a grindstone 5 fixed to the upper end of the lower shaft 4, and the lower shaft 2 is driven to rotate by a driving device (not shown).

The upper shaft portion 3 has an upper shaft 8 provided with a holding portion (holder) 7 for holding the optical component 6 at its lower end portion by a suction mechanism (not shown), and an optical member held by the holder 7 with respect to the grindstone 5. Cylinder 9 for pressurizing operation for adjusting pressurization of component 6
And an upper shaft lifting cylinder 10 for feeding the upper shaft 8 to the grindstone 5. The upper shaft 8 is supported at the axial center of the outer cylinder 11 so as to be vertically movable via a linear guide 12 provided in the lower portion of the outer cylinder 11. The pressurizing operation cylinder 9 is provided above the upper shaft 8 in the outer cylinder 11, and the upper shaft lifting cylinder 10 is fixed to the outer upper end of the outer cylinder 11.

The piston rod 13 of the cylinder 10 for raising and lowering the upper shaft passes through a hole (sealed) 14 provided in the axial center of the upper end surface of the outer cylinder 11 and is inserted into the axial center of the outer cylinder 11. The pressurizing operation cylinder 9 is fixed to the tip end (lower end in the figure) of the piston rod 13. In the figure, 15 is a piston, 16 is an air port for raising operation, and 17 is an air port for lowering operation.

The pressurizing operation cylinder 9 is composed of two cylinder parts, a lower pressurizing operation cylinder part 18 and an upper pressurizing operation cylinder part 19. The lower pressurizing cylinder portion 18 and the upper pressurizing cylinder portion 19 are vertically opposed to each other with the intermediate support member 20 interposed therebetween, and the tip end portion of the piston 13 is fixed to the upper end surface of the lower pressurizing cylinder portion 18.

The lower pressurizing operation cylinder portion 18 and the upper pressurizing operation cylinder portion 19 are arranged such that the lower pressurizing piston 21 and the upper pressurizing operation cylinder portion 19 are not airtight to the inner peripheral walls of the respective cylinder portions 18, 19. The pressure piston 22 is the upper cylinder chamber 23,
They are arranged in the lower cylinder chambers 24, respectively, and are configured so that the sliding resistance at the time of pressurizing operation can be made extremely small. That is, in the upper and lower cylinder chambers 23 and 24,
An airtight upper thin film 25 and a lower thin film 26, which are formed by coating rubber or the like on Teflon cloth or the like, are elastically deformable in the vertical direction, and the upper end of the upper thin film 25 is in the upper cylinder chamber 23. Is fixed along the outer circumference of the upper end of the lower cylinder 26, and the lower end of the lower thin film 26 is fixed along the outer circumference of the lower end in the lower cylinder chamber 24. Of the upper cylinder chamber 23 and the lower cylinder chamber 24 divided by the upper and lower thin films 25 and 26 as partition walls, the upper cylinder chamber 23a surrounded by the upper thin film 25 is surrounded by the lower thin film 26 via the air port 27. Air is pumped into the lower cylinder chamber 24a via the air port 28.

The pressing rod portion 2 is provided between the upper and lower thin films 25.
9 is provided, and the lower pressurizing piston 21 and the upper pressurizing piston 22 are fixedly provided at both upper and lower ends of the pressurizing rod portion 29. The pressure rod portion 29 is a rod support portion 30.
It is fixedly supported via the rod support portion 30 by a frame-shaped slider 31 provided with.

The slider 31 is provided so as to be vertically slid and guided by the intermediate support member 20 provided between the lower pressurizing operation cylinder portion 18 and the upper pressurizing operation cylinder portion 19. The upper end of the upper shaft 8 is connected to the lower end of the slider 31 via a connecting member 32, and the upper cylinder chamber 2 is connected through the upper air port 27.
The upper shaft 8 is pushed by the air pressure-fed into the cylinder 3a via the pressure rod 29 and the slider 31.
It is configured such that the descent operation is performed separately from the drive of 0. That is, when the upper shaft 8 is further lowered after the optical component 6 held by the holder 7 comes into contact with the grindstone 5, the lower pressurization connected to the upper shaft 8 via the slider 31 and the pressing rod 29 is performed. The piston 21 is configured so as to be able to relatively rise in the upper cylinder chamber 23, and the raised lower pressurizing piston 21 is moved upward by the amount corresponding to the rise.
Pressurization can be performed by the upper cylinder chamber 23a via air that is pressure-fed.

The holder 7 has an upper shaft 8 as shown in FIG.
It is fixed to the lower part of the holder support rod 33 which is inserted into the hole 8a formed in the flange portion formed at the lower end of the holder and is attached to the upper shaft 8 and is vertically movable with respect to the upper shaft 8 via the holder support rod 33. It is provided in. The head of the holder support rod 33 is formed to have a larger diameter than the hole 8a so that the holder support rod 33 does not fall off the upper shaft 8. A coil spring 34 is inserted between the lower end of the upper shaft 8 and the holder 7 by inserting the holder support rod 33. The coil spring 34 constantly repels the holder 7 from the lower end of the upper shaft 8. Is set to have. This allows
As long as the optical component 6 held by the holder 7 is not pressed by the grindstone 5, a gap is created between the lower end of the upper shaft 8 and the holder 7 by the elastic action of the coil spring.

At the lower end of the upper shaft 8, the grindstone 5 of the optical component 6 is provided.
A sensor 35 is attached to measure the pressure applied to. A pressure-sensitive portion 36 is provided at the lower end of the sensor 35 so as to face the holder 7, and when the optical component 6 is pressed by the grindstone 5 and the holder 7 rises relative to the operation of the upper shaft 8, the holder is moved. The upper end of 7 and the pressure sensitive part 36 are in contact with each other.

The pressure-sensitive portion 36 of the sensor 35 detects that the sensor 35 is pressed by contact with the upper end of the holder 7 and outputs a signal. The signal is analyzed in the control unit 37 connected to the sensor 35. Then, a signal from the control unit 37 is sent to an electropneumatic regulator 38 as a pressurization adjusting unit and used to adjust the air pressure of the pressurizing operation cylinder 9. The air whose pressure is adjusted is
The pressure is sent to the upper cylinder chamber 23a and the lower cylinder chamber 24a via the upper air port 27 and the lower air port 28 to increase or decrease the pressure applied to the grindstone 5 by the optical component 6.

The operation of the optical component lowering device of the present embodiment having the above structure will be described below. First, air is pressure-fed to the air port 16 of the upper shaft lifting operation cylinder 10 to raise the piston rod 13, and the pressurizing operation cylinder 9,
The upper shaft 8 is raised via the slider 31 and the holder 7 holds the optical component 6, which is the workpiece, by the suction component.
Next, the air port 17 of the cylinder 10 for raising and lowering the upper shaft.
The air is pumped to and the piston rod 13 is lowered. As a result, when the upper shaft 8 is lowered via the pressurizing operation cylinder 9 and the slider 31, the optical component 6 comes into contact with the grindstone 5 of the lower shaft portion 2.
Is in contact with the grindstone 5, the pressure rod portion 29 relatively rises in the upper cylinder chamber 23 of the lower pressure operation cylinder portion 18.

Next, air is pressure-fed from the air port 27 into the upper cylinder chamber 23a of the lower pressurizing cylinder portion 18, and the lower pressurizing piston 21 is pressed to lower the optical component 6 to the grindstone 5. The optical component 6 is polished by pressing. During this pressurization, the upper pressurizing operation cylinder portion 19
By sending air to the air port 28 and urging the slider 31 and the upper shaft 8 in the upward direction via the pressure rod portion 29, the pressing operation can be performed without being affected by the own weight of the upper shaft 8 itself. . Therefore, a smaller slight pressure can be set as the processing pressure.

When the optical component 6 comes into contact with the grindstone 5 in accordance with the machining of the upper shaft 8, the holder 7, which has been pushed down by the coil spring 34, moves up relative to the lowering of the upper shaft 8. , The pressure-sensitive portion 36 of the sensor 35 attached to the lower end of the upper shaft 8 is contacted. Then, when pressurization is started in the pressurizing operation cylinder 9, the contact is further strengthened,
The pressure-sensitive portion 36 receives a force equivalent to the pressing force from the upper end portion of the holder 7. The output signal of the sensor 35 at that time is the control unit 3
After being input to 7, analyzed and calculated, it is output again and input to the electropneumatic regulator 38, and the cylinder 9 for pressurizing operation is input.
Adjust the pressure of the air sent to. This also increases or decreases the pressure applied to the grindstone 5 by the optical component 6. The pressure applied by the sensor 35 is sensed again, and the process is repeated until an arbitrary set pressure is reached. Even if an arbitrary set pressure is reached, the applied pressure is constantly measured, and the optical component 6 is processed while maintaining the set pressure by the same operation as above.

According to the present embodiment, the upper shaft lifting operation cylinder 10 and the pressurizing operation cylinder 9 are separate, regardless of the processing pressure of the optical component 6, which is the workpiece, regardless of the processing pressure. In addition to being able to perform a smooth lifting operation, it is possible to set a wide range of processing pressure from the minute processing pressure to the high processing pressure required when processing optical components of small diameter. Grindstone 5
The configuration of the pressing force for is unnecessary. The pressure is constantly measured even if there is a decline in function due to the passage of time or usage, rotation or swing of the lower shaft 4 during polishing, and accompanying movement of the upper shaft 8 or holder 7, etc. An arbitrary set pressure can be maintained. Therefore, the pressure applied to the grindstone 5 of the optical component 6 during the polishing process is always maintained at an arbitrary set value, the measurement takes time, and the reliability that deteriorates due to the passage of time and the like becomes unnecessary. Accurate upper shaft pressure adjustment is possible.

[0026]

As described above, according to the present invention, the pressure applied to the grindstone of the optical component during polishing can be maintained at an arbitrary set value at all times. Calibration is also unnecessary,
As a result, it is possible to accurately and accurately adjust the upper axis pressure, and it is also possible to improve the Newton quality of the lens after processing.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged front view of part A in FIG.

FIG. 3 is a schematic configuration diagram showing a conventional optical component processing apparatus.

[Explanation of symbols]

 1 Optical Part Processing Device 2 Lower Shaft Part 3 Upper Shaft Part 5 Grinding Stone 6 Optical Parts 7 Holding Part (Holder) 8 Upper Axis 9 Cylinder for Processing Operation 10 Upper Axis Lifting Cylinder 35 Sensor 37 Controller 38 Electropneumatic Regulator

Claims (1)

[Claims] 1. A lower shaft part equipped with a grindstone rotatably driven, an upper shaft part having an upper shaft having a holding part for holding an optical component which is a workpiece, and an elevating and lowering the upper shaft. For raising and lowering operation unit, a pressure operation unit for pressing the optical component held by the holding unit against the grindstone when the upper shaft is lowered, a sensor for detecting the pressure of the pressure operation unit,
An optical system comprising a control unit that analyzes and calculates an output signal from the sensor, and a pressurizing adjustment unit that adjusts a pressure applied to the grindstone by an optical component based on the output signal from the control unit. Parts processing equipment.