JP4055945B2 - Polishing equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a polishing apparatus, and more particularly to an apparatus structure suitable as a polishing apparatus for polishing a lens.
[0002]
[Prior art]
In general, conventional lens polishing apparatuses include an upper shaft swing type polishing apparatus called an Oscar type and a lower shaft swing type polishing apparatus. In any of the polishing methods, in many cases, the free abrasive grains are fixed in a state where the lens is fixed to one of a pair of polishing members that are in sliding contact with the lens by wax or chucking, and the polishing member to which the lens is fixed is rotated. While supplying the polishing liquid containing, the polishing surface of the other polishing member is swung with respect to the surface of the lens for polishing.
[0003]
In a polishing apparatus called an Oscar type, a swinging shaft member called a hairpin is attached to a swinging arm configured to be capable of various swinging operations such as reciprocating swinging and swinging swinging. The moving shaft member is attached to the lens holder, which is one of the polishing members, at an angle. On the other hand, the polishing dish which is the other polishing member is attached to a lower rotating shaft configured to be rotatable.
[0004]
In the conventional polishing apparatus, as the upper shaft structure, a swing mechanism for reciprocally swinging the swing arm left and right, or turning in a circular or elliptical shape is connected to the base of the swing arm. . A pressure mechanism comprising an air cylinder or the like for applying a predetermined polishing pressure to the lens holder is connected to the tip of the swing arm via a swing shaft member. The oscillating shaft member is attached to the oscillating arm so that its mounting position can be adjusted only in the vertical direction or in the vertical direction and the front-rear direction.
[0005]
Further, among conventional polishing apparatuses, the one that the lower rotating shaft can be moved in the front-rear direction, as devised by the present inventor, or the lower rotating shaft is inclined with respect to the vertical posture. Some have been proposed. In addition, the swinging shaft member and the polishing member are not attached to each other at an angle as described above, but the swinging shaft member is fixed to the polishing member, and the swinging shaft moves in a spherical manner along the lens polishing surface. In some cases, a mechanism for swinging is used.
[0006]
[Problems to be solved by the invention]
By the way, in the above-mentioned conventional polishing apparatus, the height of the lens surface changes due to the fluctuation of the lens thickness and the wax thickness for adhering to the polishing dish, and the lower rotating shaft can move in the front-rear direction as described above. If it is configured or the angle of the lower rotating shaft is adjustable, the height and front / rear position of the polishing plate will change depending on the degree of adjustment. It is necessary to adjust the attachment part between the members. This mounting part usually has a structure in which a through hole is formed in one of the rocking shaft member and the rocking arm and the other is inserted into the through hole and fixed with a set screw or the like. There is a problem of having to rely on intuition and requiring trial and error and skill. In particular, since the mounting portion is generally located at a position where the polishing liquid is likely to adhere, the adjustment work described above is made more difficult.
[0007]
In addition, the structure of the mounting portion between the swing shaft member and the swing arm as described above reduces the rigidity of the entire upper shaft structure. Therefore, it is necessary to secure the rigidity required to maintain the polishing accuracy. There is a problem of increasing the weight around the part. The increase in the weight of the upper shaft structure makes it difficult to control the polishing pressure. For example, the polishing pressure cannot be reduced sufficiently, so that the lens is deformed when processing a thin lens, and the optical surface accuracy of the lens cannot be obtained. There are problems such as.
[0008]
Furthermore, in recent years, the shortage of skilled workers has become more serious due to the shortage of young workers and the increase in overseas workers in sites where the working environment is poor, while the skill of skilled workers is extremely important in lens polishing. For this reason, the demand for lens polishing apparatuses that enable adjustment work that does not require skill is rapidly expanding.
[0009]
Therefore, the present invention solves the above-described problems, and the problem is that the adjustment work of the apparatus can be easily performed by eliminating the adjustment work of the mounting portion between the upper swing shaft and the swing arm. Another object of the present invention is to provide a new polishing apparatus that does not require skill in the adjustment work.
[0010]
[Means for Solving the Problems]
In order to solve the above-described problems, a polishing apparatus according to the present invention includes a lens holder disposed on an upper side, a swinging member connected to the lens holder so as to freely rotate at an angle, and a lens with respect to the lens holder . A polishing plate having a polishing surface facing the lower side, a swing drive means for swinging the swing member and applying a predetermined polishing pressure downward, and rotating the polishing plate around its axis A polishing apparatus for polishing the lens , comprising: a rotation driving means; and an inclination adjusting means that can be set by changing an inclination angle of a rotation axis of the polishing dish with respect to the swinging member; and the inclination angle to the a first moving means for vertically moving the position of the polishing dish to be set along the modified surface, and can be set by moving the position of the grinding dish horizontal direction along the changing surface A second moving means and the tilt Adjustment means, wherein said first moving means and the vertical and horizontal position of the angle of inclination is set by the second moving means and the polishing dish is provided a detecting means for detecting, respectively.
[0011]
According to this invention, when the rotation axis of the polishing dish is adjusted to a predetermined inclination angle by the inclination adjustment means, the first movement means and the second movement means cause the vertical direction and the horizontal direction along the change surface of the inclination angle. which is configured to be able to move the polishing dish, enough by modifying only the position of the grinding dish when matching of the position of the grinding dish with the lens holder, to adjust the position of the lens holder You can eliminate the need. Therefore, since the mechanism on the rocking side can be simply configured and the rigidity can be increased without increasing the weight, the polishing pressure can be easily controlled and the positional accuracy of the polishing member can be increased. Can be improved.
[0012]
In the present invention, the detecting means is directly or indirectly attached to the drive shafts of the inclination adjusting means, the first moving means, and the second moving means, respectively , and the inclination angle, the vertical direction of the polishing dish, and the horizontal direction. A digital counter that indicates the position in the direction as an absolute value is preferable. The digital counter can easily grasp the position and the inclination angle of the second polishing member, and can reduce the ambiguity of the setting during the adjustment operation of the position and the inclination angle.
[0013]
In the present invention, the tilt adjusting means, the first moving means, and the second moving means are each provided with a handle for rotating the drive shaft, and by rotating the handle, the tilt angle, the polishing dish It is preferable that the vertical position and the horizontal position of each can be adjusted .
[0014]
Further, in the present invention, an upper cover and a lower cover for accommodating the first polishing member and the second polishing member are provided, and the upper cover planarly connects the first polishing member and the second polishing member. The lower cover is formed in a bottomed shape having a predetermined depth so as to cover the first polishing member and the second polishing member from below, and the lower cover is formed between the upper cover and the lower cover. A flexible member is disposed to cover a gap therebetween, and either the upper cover or the lower cover can be tilted together with the second polishing member or a support structure thereof, and the first direction and the second direction It is preferable to be configured to be movable.
[0015]
Further, in the present invention, it is preferable that the other of the front SL on the cover said lower cover is configured to be movable in the second abrasive member or the second direction together with the support structure.
[0016]
In the above inventions, before Symbol inclination adjusting means (pivotally supported on the primary moving base,) and rotatably configured inclined drive shaft, flexibly linked threaded shaft against the inclined drive shaft And a nut portion that is screwed to the screw shaft and is fixed to the second polishing member (or the rotating frame).
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of a polishing apparatus according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view of the apparatus of this embodiment as viewed from the right side, and FIG. 2 is a longitudinal sectional view of the apparatus of this embodiment as viewed from the front. In any of the drawings, a part of the structural portion on the near side that does not appear in the longitudinal section is indicated by a one-dot chain line.
[0018]
A lower rotary shaft 11 is rotatably supported by a lower bearing 21 inside a frame 10 formed in a box frame shape, and the lower rotary shaft 11 is rotationally driven by a drive motor 13 via a drive belt 12. It is configured. A polishing plate 51 is fixed to the lower rotating shaft 11, and the upper surface of the polishing plate 51 is a polishing surface for polishing the lens 53.
[0019]
The lens 53 is fixed on the lower surface of the lens holder 52 by using a pitch or the like. The upper part of the lens holder 52 is rotatably fitted to a sphere formed at the tip of the swing shaft member 54. The upper part of the swing shaft member 54 is fixedly attached to the swing arm 55. The swing arm 55 is connected to the drive unit 57 so as to be rotatable about a rotation shaft 56, and is configured to be able to apply a predetermined polishing pressure downward in the figure by an air cylinder 58. In the above-described upper shaft structure, the swing shaft member 54 swings back and forth or swings by the swing operation of the drive unit 57, and the lens holder 52 also swings on the polishing plate 51 in response to this. It has become.
[0020]
The shaft support portion of the lower rotating shaft 11 and the drive system of the lower rotating shaft 11 are fixed to the rotating frame 15. The rotating frame 15 is rotatably attached to the pair of horizontal movement bases 16 at both left and right ends. The pair of horizontal movement bases 16 are respectively attached to a horizontal movement frame 17, and the horizontal movement frame 17 is slidably attached to a horizontal movement guide 18 having a pair of upper and lower guide shafts extending in the front-rear direction. The horizontal movement guide 18 is fixed to the vertical movement base 19. The vertical movement base 19 is attached to the vertical movement guide 22 so as to be slidable up and down.
[0021]
The pair of left and right horizontal movement guides 18 are respectively engaged with male threads 23 a formed on the outer peripheral surfaces of the distal ends of the pair of horizontal movement shafts 23, and the left horizontal movement shaft 23 shown in FIG. 2 is rotated by a handle 24. . A sprocket 27 is fixed to the left horizontal movement shaft 23, and the right horizontal movement shaft 23 is also rotated via a transmission chain 29 installed between the sprocket 27 and the same sprocket 28. Yes. The rotation amount of the left horizontal movement shaft 23 can be measured by a digital counter 25.
[0022]
Male screws 31a formed on upper portions of a pair of upper and lower driven shafts 31 provided on the left and right are respectively screwed into the pair of left and right vertical movement bases 19. A driven bevel gear 32 is fixed at an intermediate height position of the right vertical driven shaft 31 shown in FIG. 2, and this driven bevel gear 32 is fixed to a vertical drive shaft 33. Is engaged. The right vertical drive shaft 33 can be rotated by a handle 35, and the rotation can be measured by a digital counter 36. When the right vertical drive shaft 33 rotates, the right vertical drive shaft 31 shown in FIG. 2 rotates, and the sprocket 37 fixed to the lower end of the vertical drive shaft 31 and the lower end of the left vertical drive shaft 31 are fixed. The left upper and lower driven shafts 31 are rotationally driven via a transmission chain 39 installed between the sprockets 38.
[0023]
An extension frame portion 41 is fixed to the lower portion of the rotation frame 15, and a nut member 42 is rotatably attached to the lower end of the extension frame portion 41. The tilt drive shaft 43 is connected to a tilt adjustment shaft 45 via a universal joint 44 that is configured to be refractable. A male screw 45 a is formed on the outer periphery of the inclination adjusting shaft 45, and the male screw 45 a is screwed into the nut member 42. The tilt drive shaft 43 is configured to be rotationally driven by a handle 46, and the rotation amount is measured by a digital counter 47. The tilt drive shaft 43 is pivotally supported via a fixture or the like with respect to the support frame 48 fixed to the horizontal movement base 16 or the horizontal movement frame 17.
[0024]
The digital counters 25, 36, and 47 are all configured such that the measured value of the counter increases or decreases in accordance with the forward / reverse rotation amounts of the horizontal drive shaft 23, the vertical drive shaft 33, and the tilt drive shaft 43. These show the front-rear position, the vertical position, and the tilt angle of the rotating frame 15 as absolute values. As this digital counter, various detection methods and counting methods can be used. However, from the viewpoint of reliability and cost, both the detection method and the counting method are mechanical. It is preferable that
[0025]
Next, the operation of the polishing apparatus described above will be described. In this polishing apparatus, as shown in FIG. 1, when the tilt drive shaft 43 is rotated by rotating the handle 46, the tilt adjustment shaft 45 is also rotated via the universal joint 44, so that the nut member 42 is tilt-adjusted. As shown by a two-dot chain line in FIG. 1 with respect to the shaft 45, the shaft 45 moves in the axial direction. As a result, the shaft 45 is centered on the inclined central axis S that is a pivot shaft between the pivot frame 15 and the horizontal movement base 16. The rotating frame 15 rotates. As the rotating frame 15 rotates, the lower rotating shaft 11 has an inclination angle corresponding to the amount of rotation.
[0026]
When the pair of horizontal drive shafts 23 is rotated by rotating the handle 24, the horizontal moving frame 17 is moved back and forth along the two guide shafts of the horizontal moving guide 18 with the horizontal moving base 16 and the rotating frame 15. Since it moves in the direction, the lower rotating shaft 11 moves in the front-rear direction by a movement amount corresponding to the rotation amount.
[0027]
Further, when the vertical drive shaft 33 rotates by rotating the handle 35, the pair of vertical driven shafts 31 rotate so that the vertical movement base 19 moves up and down with the horizontal movement frame 17, the horizontal movement base 16, and the rotation frame 15. Therefore, the lower rotary shaft 11 moves in the vertical direction with a movement amount corresponding to the rotation amount.
[0028]
In the present embodiment configured as described above, as shown in FIG. 3A, when the lower rotary shaft 11 is tilted by a predetermined tilt angle θ about the tilt center axis S, as shown in FIG. As shown in b), the lower rotary shaft 11 is moved by the horizontal movement amount x in the front-rear direction X, and the lower rotary shaft 11 is moved in the vertical direction Z by the vertical movement amount z as shown in FIG. Accordingly, the position of the lens holder 52 can be aligned with the lens (the material to be polished) 53 on the polishing plate 51 without changing the position of the swing shaft member 54 at all.
[0029]
In this case, the tilting motion of the lower rotating shaft 11 is an XZ plane (in the case of this embodiment, a vertical plane, that is, a plane parallel to the plane of FIG. 1 and FIG. 3. This plane corresponds to the above-described change plane. And the position of the swing shaft member 54 and the lens holder 52 attached to the upper shaft structure (the swing arm 55, etc.) and the lower shaft (the lower rotary shaft 11, etc.). The positions of the mounted polishing dish 51 and the lens 53 are shifted from each other in the XZ plane. On the other hand, as described above, the lower rotary shaft 11 is configured to be independently movable in both the X direction (horizontal front-rear direction) and the Z direction (vertical vertical direction). It can be moved to any position in the XZ plane. Therefore, the lower shaft structure of this embodiment can always be aligned with the upper shaft structure even in a state where the tilt angle θ is set by the mechanism described above. This means that the distance between the polishing position and the inclined central axis S can be changed by changing the length of the rocking shaft member, the thickness of the lens holder, the lens, the polishing dish, or the length of the lower rotating shaft. The same applies to the case where the change is made, and the consistency between the upper axis and the lower axis can be always obtained in accordance with these changes.
[0030]
In this embodiment, the tilt angle θ, the horizontal movement amount x, and the vertical movement amount z can be accurately and immediately grasped by the digital counters 25, 36, and 47, respectively. Therefore, a predetermined adjustment state can be obtained easily and reliably and with good reproducibility, so even if each setting value is obtained in advance, adjustment is easily performed even for beginners without requiring skill in adjustment work. be able to. In particular, since it is only necessary to set the value to a preset value by a digital counter, the ambiguity of the setting can be reduced as compared with the case where the analog setting is performed, so that a highly accurate adjustment operation can be performed. Since the digital counter of this embodiment includes a mechanical detection structure and a mechanical counter, there is an advantage that setting backup is not required and a reliable operation can be obtained.
[0031]
In this embodiment, there is no need to adjust the mounting portion between the swinging arm and the swinging shaft member on the upper shaft, so there is no need to mess with the mounting portion to which the polishing liquid easily adheres, and the work can be done with a feeling. Since it is not performed, adjustment accuracy and reproducibility are improved. Further, the adjustment work can be performed very easily. Furthermore, since it is not necessary to provide a structure for adjustment in the mounting part, the rigidity of the swing mechanism can be increased without causing an increase in weight, so that the polishing pressure can be reduced and the polishing accuracy can be reduced. Can also be increased.
[0032]
FIG. 4 shows the structure for attaching the polishing cover used in this embodiment. Usually, the polishing cover covers the periphery of the polishing processing portion, that is, the portion where the polishing plate 51, the lens holder 52 and the lens 53 are arranged so that the slurry liquid containing abrasive grains does not splash around. . In the present embodiment, an upper cover 62 made of a stainless steel plate or the like engaged with the frame 10, a shaft support structure of the lower rotating shaft 11, and a lower cover 67 made of a stainless steel plate fixed to the rotating frame 15, etc. A closing cover 68 made of a transparent material such as an acrylic plate is detachably attached so as to close the upper opening of the frame. The closing cover 68 is formed with an opening 68a configured to allow a swing shaft member (pin) not shown to pass through the swing range without any trouble.
[0033]
The upper cover 62 is formed in a planar frame shape so as to surround the polishing processing section, and a pair of left and right engaging between the opening edge of the frame 10 and the guide rail 61 attached to the lower surface of the opening edge. It has a side edge 62a and is configured to be slidable in the direction of the drawing sheet. A connection tool 64 is attached to the upper cover 62, and the connection tool 64 is attached to a linear slider 65. The linear slider 65 is fitted to a linear rail 66 attached to the horizontal movement base 16 and is attached to the linear rail 66 so as to be slidable in the vertical direction. Accordingly, the upper cover 62 is configured to integrally move back and forth as the horizontal movement base 16 moves back and forth while maintaining its vertical position. A flexible sheet 63 made of synthetic rubber or the like is attached to the lower end of the upper cover 62 so as to surround the lower rotary shaft 11.
[0034]
The lower cover 67 is formed in a box shape with no lid so as to cover the polished portion from below. The lower cover 67 is formed with a through hole 67a through which a shaft support structure for supporting the lower rotary shaft 11 passes, and the lower cover 67 is fixed to the rotating frame 15 disposed below the through hole 67a. Therefore, the lower cover 67 is configured to integrally move up and down as the rotating frame 15 moves up and down, and to tilt integrally as the rotating frame 15 tilts.
[0035]
As described above, the upper cover 62 moves together with the horizontal movement base 16 in the front-rear direction, but the positional relationship with the upper cover 62 changes depending on the lifting and tilting operations of the lower cover 67, and the upper cover 62 and the lower cover depend on the location. There may be a gap between the cover 67 and the cover 67. In that case, the flexible sheet 63 extends between the upper cover 62 and the lower cover 67 to ensure the sealing property (coverability) of the polished portion. In this embodiment, the flexible sheet 63 is attached to the upper cover 62 and hangs downward as it is, but the lower end portion of the flexible sheet 63 is the lower cover 67 (preferably the upper end portion thereof). The upper cover 62 and the lower cover 67 may be completely sealed by the flexible sheet 63. At this time, the flexible sheet 63 is attached to both the upper cover 62 and the lower cover 67 with a certain margin.
[0036]
Note that the polishing apparatus of the present invention is not limited to the illustrated examples described above, and it is needless to say that various modifications can be made without departing from the scope of the present invention.
[0037]
【The invention's effect】
As described above, according to the present invention, the mechanism on the swing side can be simply configured and the rigidity can be increased without increasing the weight, so that the polishing pressure can be easily controlled and the position of the polishing member can be increased. Since the accuracy can be increased, the polishing accuracy can be improved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a structure of an embodiment of a polishing apparatus according to the present invention as viewed from the right side.
FIG. 2 is a longitudinal sectional view of the structure of the embodiment as viewed from the front.
FIG. 3 is an explanatory diagram (a) to (c) showing a procedure of adjustment work in the embodiment.
FIG. 4 is a partial longitudinal sectional view showing a polishing cover mounting structure in the same embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Frame 11 Lower rotating shaft 15 Rotating frame 16 Horizontal moving base 17 Horizontal moving frame 18 Horizontal moving guide 19 Vertical moving base 22 Vertical moving guide 23 Horizontal drive shaft 25, 36, 47 Digital counter 33 Vertical drive shaft 43 Tilt drive shaft 62 Upper cover 63 Flexible sheet 67 Lower cover

Claims (3)

Polishing dish with a lens holder which is arranged on the upper side, a swing member connected to freely angle freely and rotate to the lens holder, a polished surface facing the lower side through the lens to the lens holder And a rocking drive means for rocking the rocking member and applying a predetermined polishing pressure downward, and a rotation driving means for rotating the polishing dish around its axis, for polishing the lens A polishing device,
Inclination adjusting means that can be set by changing the inclination angle of the rotation axis of the polishing plate with respect to the swing member;
First moving means that can be set by moving the position of the polishing dish in the vertical direction along the change surface of the inclination angle;
Second moving means that can be set by moving the position of the polishing dish in a horizontal direction along the change surface;
Detection means for detecting the inclination angle set by the inclination adjusting means, the first moving means and the second moving means and the vertical and horizontal positions of the polishing dish, respectively , is provided . Polishing equipment. The detecting device, the inclination adjuster, the respective drive shaft directly or indirectly attached first moving means and the second moving means, the inclination angle, the vertical and horizontal position of the grinding dish The polishing apparatus according to claim 1, wherein the polishing apparatus is a digital counter indicated as an absolute value . The tilt adjusting means, the first moving means and the second moving means are provided with handles for rotating the respective drive shafts, and by rotating the handles, the tilt angle, the vertical direction of the polishing dish, The polishing apparatus according to claim 2, wherein each of the horizontal positions is adjustable.

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