KR20040086085A - Lens spherical surface grinding apparatus - Google Patents

Abstract

PURPOSE: A spherical surface polisher of a lens is provided to reduce a preparing time, to easily correct a tool dish and to improve the stability of a processing accuracy. CONSTITUTION: A rotation stop member(22) is installed in a moving member(11) in parallel with a rotary face of a tool dish(9). The rotation stop member is installed in a line to be passed through the center of the tool dish. A moving advance center is set in a center control device of a moving advance by using a bow shaped cam(21). Thereby, the center of the moving advance is set quickly and delicately.

Description

Lens spherical polishing device {LENS SPHERICAL SURFACE GRINDING APPARATUS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens polishing apparatus, and more particularly, to a lens spherical polishing apparatus for use in a method for processing an optical spherical lens.

As a conventional lens polishing apparatus, there is a lens polishing machine such as Japanese Laid-Open Laboratory No. 43-13439. This conventionally known lens polishing apparatus is provided with a swinging edge supported by a horizontal axis so that the lower plate supporting shaft can be raised and lowered orthogonally to the horizontal axis, and the adjustment screw and the corner opposite to the screw disposed on the crank plate connected to the swinging drive source. The axial center of the transverse shaft by a slidable connection with a sliding member having an engaging sliding member or its stop screw, and a swinging arm having a guide groove in which the mounting position is adjustable by the half moon groove and the stop screw on the transverse axis It is possible to adjust the angular amplitude and the center position of the swinging edge of the swinging rim around the lower plate, and tighten the upper plate support shaft in the freely falling state above the lower plate, and swing on both support shafts of the lower plate of the upper plate. Forced rotation is provided through this. Specifically, as shown in FIGS. 5 and 6, the swinging edge 41 supported on the horizontal axis 40, the lower plate support shaft 42 perpendicular to the horizontal axis 40, and the lower plate support are shown. An upper plate 44 and an upper plate support shaft for supporting the upper plate 44 are formed on an upper portion of the shaft 42. Moreover, the horizontal screw 40 is provided with the set screw 51 which adjusts the center of a rocking angle, and the rocking arm 49 which provided the half-moon-shaped guide groove in the push screw 51 is connected. In addition, the swinging arm 49 is connected by a stop nut 47 disposed on the crank plate 46.

Moreover, as an automatic polishing measuring apparatus used for the conventional lens polishing apparatus, there is invention of Japanese Unexamined-Japanese-Patent No. 59-93262 which this applicant has developed and started. This conventionally well-known invention relates to a lens grinding machine, but more particularly to a grinding mechanism of a small and medium diameter precision centrifugal lens, the configuration of which rotates the polishing plate installed inside the center portion of the box and simultaneously rotates the entire box. A lens polishing mechanism comprising a polishing plate rotating rocking mechanism (A) shaken in a swing shape, and a polishing holder fixing pressing mechanism (B) for attaching and attaching a polishing holder on the polishing plate and pressing the holder shaft through a spring. In the polishing holder fixed pressurization mechanism (B), the measuring terminal which is grounded to the dial gauge with an electrical contact is mounted, and it is fixed to a holder shaft via the detection plate which connected the measuring terminal to the adjustment bolt. At the same time, it is an automatic polishing measuring device in which the dial gauge attached with the electrical contact is fixed to a holder arm via a mounting plate. Specifically, as shown in FIG. 7, it is attached to the polishing holder fixed pressure mechanism of the conventional apparatus, and 62 is a dial gauge with an electrical contact as its main body. The dial gauge 62 is configured to operate an electrical contact via a lead wire for signal extraction, and is grounded to a measurement terminal attached to the upper portion. According to this configuration, when the polishing measuring device is set in accordance with the scale of the dial gauge 62, the needle moves to the scale portion adjusted by the pressing operation of the measuring terminal, and a stop signal is issued.

Moreover, as a conventional spherical processing apparatus, there exists invention of Unexamined-Japanese-Patent No. 59-93262 which the applicant of this application developed and disclosed. This conventionally well-known apparatus aims to process workpieces, such as a lens, highly precisely and smoothly, and the mechanism passes the centroid O of the spherical surface of a tool plate through the pressurized shaft which presses the workpiece L through a holder. And a spherical portion having the center of gravity of the spherical surface of the tool dish as the center of the tool plate formed on the oscillating body which rotatably supports and supports the tool plate, and guides the spherical surface to support the oscillating body. It is provided with a supporting member to swing the swinging body by the swinging motor to swing the tool plate centripetally. Specifically, as shown in FIG. 8, the tool plate 71 having a spherical surface is rotatably supported by the swinging body 72 and rotatable by the rotary motor 75. The rocking member 72 is formed on the lower surface thereof with a spherical portion centered on the center of the spherical surface O of the tool dish, and is supported by the support member 73. The support member 73 is provided with a spherical portion of the rocking member 72. The support surface of the rocking body formed in the spherical surface of the same radius of curvature is formed. Moreover, an air hole is formed in this rocking support ground, and is connected with the means for generating compressed air. By blowing compressed air from this air hole, it is possible to float the swinging body 72 from the support surface of the rocking body and to support it in a non-contact state. In addition, the lower portion of the rocking body 72 is engaged with the rocking arm 72 rotated by the rocking motor 75, so that the rocking body 72 is supported by the support member 73 and guided and rocked. It is possible.

In addition, the upper side of the tool dish 71 is provided so as to be movable up and down so that the machining shaft for pressing the work piece 70 through the holder is located on an axis line passing through the center O of the spherical surface of the tool dish 71. have.

However, in the conventional lens polishing apparatus (Japanese Unexamined Patent Application, Publication No. 43-13439), adjustment of the swing center angle has to be performed while loosening or tightening the captive screw, and rapid adjustment was difficult. In the conventional automatic polishing measuring device (Japanese Patent Laid-Open No. 59-93262), when the tool plate is deep in structure, the detachment of the lens from the deep side of the swing angle becomes impossible, and the swing stops on the shallow side of the swing angle. Therefore, the lens should be attached and detached, and therefore cutting could not be stopped immediately even when a cutting completion signal was input. As a result, cutting progresses while moving to the shallower side of the swing angle, and in particular, the center thickness of the cut lens has fluctuated when the swing speed is slow.

In spherical processing apparatus (Japanese Patent Laid-Open No. 7-205008), since there is no singular point (the point at which the shaking stops) during one swinging cycle, it is possible to maintain the machining precision without deflecting wear of the tool plate. In the case of a tool plate with poor precision, it is difficult to correct the tool plate using deflection wear for one cycle of swinging because the tool plate is maintained in a state of poor machining accuracy. Thus, this invention is the apparatus developed in order to solve the above subjects, It aims at combining the stability of the processing precision with the shortening of preparation time, the ease of correction of a tool dish, and the like.

1 is a side cross-sectional view showing the device of the present invention.

2 is a front view showing a rocking portion of the apparatus of the present invention.

3 is a flow chart showing the operation of the apparatus of the present invention.

4 is a graph showing the rocking motion of the apparatus of the present invention.

5 is an explanatory schematic view showing a conventionally well-known apparatus.

FIG. 6 is an explanatory schematic diagram of a conventional apparatus shown in FIG. 5; FIG.

7 is an explanatory schematic view showing a conventionally well-known apparatus.

8 is an explanatory schematic view showing a conventionally well-known apparatus.

<Description of the symbols for the main parts of the drawings>

1: lens 2: lens holder

3: shaft 4: measuring arm

5: pressure spring 6: pressure knob

7: Arm 8: Servo Motor

9: plate 10: dial gauge

l1: Oscillator 12: Spindle

13: oscillating body support plate 14: rocking motor

15: crank unit 16: swing width adjustment knob

17 link seam 18: rocking motor

19: rocking angle adjustment unit 20: camlora

21: bow-shaped cam 22: rotation stop member

23: rotating support 25: handle

26: rotation angle adjustment nut 27: rotation position sensor

28: controller 29: inverter

40: horizontal axis 41: swinging frame

42: lower plate support shaft 43: lower plate

44: upper plate 46: crank plate

49: rocking arm 50: gourd-shaped home

51: screw 60: lens

61: polishing plate 62: dial gauge

70: Workpiece 7l: Tool Plate

72: rocking body 74: rocking motor

75: rotating motor

The present invention is a further improvement of the conventional apparatus to solve the above problems, and has a function capable of pressing the workpiece lens on the axis passing through the center of the tool dish in a tool dish having a spherical surface and parallel to the axis. It has a transfer function that can be moved, and has a swinging body which rotatably supports the tool plate and is capable of swinging a sphere about the same point as the center of the tool plate, and the swinging body is a spherical air bearing. A lens polishing apparatus in which the center of the spherical air bearing is the same as the center of the tool dish, wherein the oscillator is parallel to the rotation surface of the tool dish and passes through the center of the tool dish. The rotation stop member of the swinging body is installed on the shaft, and the bow-shaped cam is used for the centering mechanism of the swinging swing angle. The spherical polishing apparatus is characterized in that the center of the oscillation angle is set, and in the lens spherical polishing apparatus, the oscillation of the oscillating body is temporarily stopped at the position where the thickness of the lens to be processed is preset. Is vacuum-adsorbed to the lens holder, the lens holder is slightly raised to disengage from the lens polishing tool plate, and the lens is moved to a detachable position after moving the rocking angle of the rocking body in the direction of the minimum angle. The present invention provides a spherical polishing apparatus, and in the lens spherical polishing apparatus, there is provided a lens spherical polishing apparatus configured to vary a swing speed at a predetermined position of one cycle of oscillation. In which the lens to be processed is roughly ground and then precisely ground It is the provision of a spherical surface polishing device's.

(Embodiment of invention)

Embodiment of this invention has the function which can press the to-be-processed lens in the tool plate which has a spherical surface on the axis which passes through the center of the said tool dish, and has the conveyance function which can move parallel with the said axis | shaft, and rotates the said tool dish. It has an oscillating body which can be supported, and whose spherical surface can be oscillated about the same point as the center of the tool dish, and the oscillating body is supported by the spherical air bearing and the center of the spherical air bearing. In the lens polishing apparatus which is the same as the center of the tool dish, the rocking member is provided with a rotation stop member of the swing member on a line parallel to the rotation surface of the tool dish and passing through the center of the tool dish. Lens spherical surface, characterized by setting the oscillation angle center by using the cam cam to the oscillation angle center adjustment mechanism And a polishing device, wherein the lens spherical polishing device temporarily stops the swing of the swinging body at a position where the thickness of the lens is set in advance, and further, by vacuum-adsorbing the lens to the lens holder to raise the lens holder slightly. A lens spherical polishing apparatus which moves away from a lens polishing tool dish and further moves the rocking angle of the rocking body in the direction of the minimum angle, and then moves the workpiece lens to a detachable position. A lens spherical polishing apparatus configured to vary the swing speed at a designated position of one cycle of swinging the body, and furthermore, in the lens spherical polishing apparatus described above, a lens spherical surface which is subjected to precision grinding and polishing after rough processing of the lens to be processed. Since it is a grinding device, the feed screw installed in the center of the swing By turning the handle, the center of the oscillation angle can be set quickly and delicately, and the cutting can be completed at the same time as the completion signal, thereby eliminating the variation in the center thickness of the lens to be processed. In addition, since the swing speed can be changed at a specific position in one cycle, the plate dish can be adjusted to promote the abrasion wear of the dish. In addition, when a diamond with a large mesh is used for the tool dish, grinding can be carried out during the last few days and can be performed by the same apparatus from the material to the final polishing. Therefore, it is not necessary to use a different apparatus for each conventional process, thereby simplifying the work. Moreover, by using the apparatus of the present invention, it is possible to provide a polishing apparatus having both a shortening of preparation time, stability of processing accuracy and ease of precision adjustment, thereby facilitating a high precision lens polishing processing method.

Example

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described according to drawing.

1 and 2 show the lens spherical polishing apparatus of the present invention, FIG. 1 is a sectional view of the side surface, and FIG. 2 shows a front view of the swinging portion, respectively.

In the drawings, reference numeral 1 denotes a workpiece lens, 2 a holder holding the workpiece lens 1, 3 a shaft supporting the holder 2, and 4 a measurement arm connected to the shaft 3. to be. The shaft 3 presses the workpiece lens 1 on the axis along which the spherical center O passes through the tool plate 9 by the pressing spring 5, while the measuring arm 4 is the shaft 3. And the measuring member of the dial gauge 10 is pressed according to the cutting amount of the lens 1 to be processed. The dial gauge 10 is a structure which a signal outputs by the value of the dial gauge 10 preset, and it is set so that a signal may be output when the to-be-processed lens 1 reaches the prescribed cutting amount. (7) is an arm holding the holder 2, the shaft 3, the measuring arm 4, and the dial gauge 10, and is comprised so that it may move up and down by the servo motor 8. As shown in FIG. In addition, the tool dish 9 is rotatably supported by the spindle 12 such that the center O of the spherical surface of the tool dish 9 coincides with the rotation center of the spindle 12, and the spindle l2 is supported by the tool dish. The rotation center of the spindle 12 is disposed in the oscillator 11 having the spherical air shaft 11a centered on the spherical surface O of (9) so as to coincide with the center of the spherical air shaft 1la. And the spindle 12 is driven by the rotation motor 14 of a tool dish. Moreover, the drive body 11 floats by the air pressure from the oscillator support plate 13 which has the spherical air bearing 13a, and the oscillator support plate 13 has the spherical center O of the processing surface of the to-be-processed lens 1, and It is arrange | positioned so that the center of the spherical air shaft 1la of the oscillation body 11 may coincide.

Reference numeral 22 is a rotational political member and is disposed on an axis parallel to the rotational surface of the spindle 12 and passing through the center of the spherical air shaft 1la of the swinging body 11. Further, reference numeral 23 denotes a rotation stop receiving guide groove 22 of the rotation stopping member, and is connected to the swing support plate 13. Moreover, 15 is a crank unit, and is comprised so that the fluctuation | variation width of the oscillation body 11 may be adjusted by moving the link joint 17 by the handle 25. As shown in FIG. In addition, 18 is a swinging motor, and is attached to the swinging angle adjustment unit 19, and the crank unit 15 is connected to the rotating shaft. In addition, the swing angle adjusting unit 19 has a cam roller 20 and is connected to the cam cam 21. The bow 21 has a direction in which the swing track surface presses the workpiece lens 1. It is arrange | positioned so that the center of a swinging trace may be parallel and cross | intersects perpendicularly to the pressing direction of the to-be-processed lens 1. Further, the swing angle adjustment nut 26 is rotatably connected to the swing angle adjustment unit 19 in a parallel direction with the swing angle length adjustment unit 19. When the handle 25 is turned, the swing angle adjustment unit 19 is interposed. The angle is adjusted by the screw. Then, the rotational position sensor 27 is connected to the swinging motor 18, the rotational position signal is sent to the controller 28, and the controller 28 controls the servo motor 8 to control the workpiece lens 1. ) Is configured to move.

3 is a flowchart showing a controller of the apparatus of the present invention. The controller 28 sets the dial gauge 10 so as to output a signal to a target value of the center thickness of the lens 1 in advance, and sets the tool lens 1 to a tool plate by an instruction to start operation. Transfer to). The controller 28 also rotates the rocking motor 18 via the rotary motor 14 and the inverter 29 in the tool plate. Then, when the machining of the lens 1 is started and the cutting of the lens 1 proceeds as the shaft 3 moves in the cutting direction of the lens 1, the measuring arm 4 is connected to the shaft 3. Therefore, the measuring member of the dial gauge 10 is pushed in synchronization with the cutting of the workpiece lens 1. At that time, the cutting completion signal is input to the controller 28 at the time when the target thickness of the workpiece lens 1 reaches the target value, while the controller 28 controls the rotary motor 14 and the inverter 29 of the tool plate. The swinging motor 18 is stopped through it.

In addition, the workpiece 1 is vacuum-adsorbed to the holder 2 and separated from the tool dish 9 by a few mm. Then, the swinging motor 18 is rotated again via the inverter 29 and the front position sensor ( The swinging motor 18 is stopped again via the inverter 29 by the small position signal of the swinging angle of 27. Then, when the to-be-processed lens 1 is moved to a detachable position, all work will be completed. In addition, the controller 28 commands the rotational speed to the inverter 29, and the rocking speed of the rocking motor 18 is automatically controlled.

Figure 4 shows a control example, one shows an example of wearing the outer side of the tool dish biased, and the other shows an example of wearing the inner side of the tool dish biased. In this manner, by partially varying the swinging speed, bias wear of the tool dish occurs, so that the R of the tool dish is changed.

The present invention has a function capable of pressing a workpiece lens on a tool plate having a spherical surface on an axis passing through the center of the tool plate, and has a feed function capable of moving in parallel with the axis, and rotatably supporting the tool plate. And a swinging body freely swinging around a sphere about the same point as the center of the tool plate, and furthermore, the swinging body is supported by a spherical air bearing, and the center of the spherical air bearing is A lens polishing apparatus having the same point as a centripet, wherein the oscillating member is provided with a rotation stop member of the oscillating body on a line parallel to the rotational surface of the tool dish and passing through the center of the tool dish, and further comprising a centering mechanism for oscillating angle. Lens spherical polishing apparatus, characterized in that the use of a bow-shaped cam and setting the oscillation angle center In addition, in the lens spherical polishing apparatus, the fluctuation of the swinging body is temporarily stopped at a position where the thickness of the lens to be processed is preset, and the lens is vacuum-adsorbed to the lens holder to raise the lens holder slightly so as to raise the lens polishing tool. A lens spherical polishing apparatus which moves away from a plate and moves the oscillation angle of the oscillator again in the direction of the minimum angle, and then moves the workpiece lens to a detachable position, and the oscillation of the oscillator 1 in the lens spherical polishing apparatus. The lens spherical polishing apparatus configured to vary the swinging speed at a designated position of the period, and the lens spherical polishing apparatus in which the lens spherical polishing apparatus roughly grinds the processed lens and then grinds and polishes the lens. It has many effects superior to the conventional method.

a, the apparatus of the present invention has a structure in which the lens to be processed on a tool plate having a spherical surface is pressurized on an axis passing through the center of the sphere of the tool plate, and has a transfer device which is movable in parallel with the axis, and the tool plate can be rotated. And a spherical freely oscillating body about the same point as the center of the spherical surface of the tool dish, and the oscillating body is supported by a spherical air bearing, and the center of the spherical air bearing is In the polishing apparatus which is the same point as the center of the spherical surface of the tool dish, the oscillation angle is provided by rotating the rotation stop member of the rocking body on a line parallel to the rotation surface of the tool dish and passing through the center of the spherical surface of the tool dish. A cam is used for the center adjustment mechanism of the Since the center of the swinging trajectory of the bow-shaped cam is parallel to the line passing perpendicular to the pressing direction of the lens to be processed through the center of the spherical air bearing, the center of the swinging angle is set. By turning the handle of the feed screw provided in the center adjusting mechanism of the swinging angle, the center of the swinging angle can be set quickly and subtly.

b. In addition, the apparatus of the present invention stops the rotation of the tool plate and the oscillation of the oscillator once the center thickness of the workpiece lens reaches a predetermined value, and vacuum-adsorbs the workpiece lens to the holder of the workpiece lens. After cutting the tool plate by raising it several mm and moving the oscillator to the minimum angle of the swing angle, the lens is detached by moving the workpiece lens to a detachable position. The variation in the center thickness of the lens to be processed is eliminated.

c. In addition, the apparatus of the present invention adds a sensor for detecting the position of one cycle of oscillation to the planetary motion type polishing apparatus, which is characterized by the continuation of processing accuracy, and changes the speed of oscillation at a specific position of the one cycle. Under the control of the plate, biased wear of the dish can be promoted, and the tool dish can be adjusted. At this time, it is also possible to make the fluctuation speed of one cycle constant.

d. In addition, the present invention can be roughly grounded by using a diamond having a large mesh for the tool dish, and can be performed with the same apparatus from the material to the final polishing. Therefore, it is necessary to use a different apparatus for each process as in the conventional method. Nothing at all, it can simplify your work.

e. In addition, according to the apparatus of the present invention, a polishing apparatus having both a shortening of preparation time, stability of processing accuracy, and ease of precision adjustment can be provided, thereby facilitating a highly accurate lens polishing processing method.

Claims (4)

A tool plate having a spherical surface has a function capable of pressing the workpiece lens on an axis passing through the center of the tool plate, and has a feed function capable of moving in parallel with the axis, and rotatably supporting the tool plate. And a swinging body freely swinging around a sphere about the same point as the center of the tool dish, and the swinging body is supported by the spherical air bearing and the center of the spherical air bearing is the center of the tool dish. In the lens polishing apparatus which is the same point as the above, the oscillating member is provided with a rotation stop member of the oscillating body on a line parallel to the rotation surface of the tool dish and passing through the center of the tool dish, and the bow is moved to the center adjusting mechanism of the oscillating angle. A lens spherical polishing apparatus, characterized in that the oscillation angle center is set using a shape cam. The method according to claim 1, wherein the fluctuation of the oscillator is paused at a position where the thickness of the workpiece lens is set in advance, and the workpiece lens is vacuum-adsorbed to the lens holder, and the lens holder is raised slightly to depart from the lens polishing tool dish. And further shifting the processing lens to a detachable position after the rocking angle of the rocking body is moved in the direction of the minimum angle. 2. The lens spherical polishing apparatus according to claim 1, wherein the swinging speed is configured to be variable at a designated position of one swinging cycle of the swinging body. 2. The lens spherical polishing apparatus according to claim 1, wherein the lens to be processed is roughly ground and then precisely ground and polished.