JP2007105814A - Lens polishing device and lens polishing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens polishing device and a lens polishing method for efficiently and precisely polishing an optical lens high in face precision. <P>SOLUTION: The lens polishing device 1 is provided with a polishing plate (a polishing part) 3 having a spherical polishing face 3a brought into face contact with a lens 2 to be machined, a holding and pressing part 6 for pressing the lens 2 to be machined against the polishing face 3a while holding the lens 2 to be machined via a lens holder 5, a first oscillating mechanism 8 for oscillating the holding and pressing part 6 around a first oscillating axis C1 passing a spherical center 7 of the polishing face 3a to the polishing plate 3, a second oscillating mechanism 10 for oscillating the polishing plate 3 around a second oscillating axis C2 passing the spherical center 7 to the holding and pressing part 6, a control part 12, which drives the first oscillating mechanism 8 when the spherical center 7 is arranged on the polishing plate 3 side and drives the second oscillating mechanism 10 when the spherical center is arranged on the holding and pressing part 6 side, and a detection sensor (a detection part) 13 for recognizing on which side of the polishing plate 3 side or the holding and pressing part 6 side the spherical center 7 is arranged. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lens polishing apparatus and a lens polishing method for polishing by bringing a lens or the like into surface contact with a rotating polishing surface.

  In recent years, there has been an increasing demand for higher precision and thinner optical lenses due to digitalization, and accordingly, the number of deep surface shapes (shapes close to a hemisphere) and high surface accuracy lenses are increasing. As a polishing apparatus and a polishing method for polishing such an optical lens, there is known a method in which a lens to be processed is brought into surface contact with a rotating polishing dish (see, for example, Patent Document 1).

In this lens polishing apparatus, the lens to be processed is added to the polishing dish driven by the rotation of the drive motor through a holder for holding the lens to be processed by a pressure pin built in the lens holding and pressing unit. Pressed. At this time, the lens holding pressure unit is swung around the point J which is the center of curvature of the polishing surface of the polishing dish, whereby the lens to be processed is polished by the polishing surface.
Japanese Patent No. 2634275 (FIGS. 1 and 2)

  However, in the conventional lens polishing apparatus and lens polishing method described above, the lens to be processed swings. Here, as illustrated in Patent Document 1, when a convex lens is polished, the swing center position is not the polishing dish side but the to-be-processed lens side. Therefore, when rotational torque is generated in the lens holding pressure unit due to the frictional force generated between the lens to be processed and the polishing dish, the swinging direction coincides with the rotation direction of the lens holding pressure unit due to the rotational torque. In addition, since the point J is not fixed to the apparatus, the swinging is non-uniform, and chattering or omission of the lens to be processed occurs. Therefore, another processing machine may be required to remove this.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a lens polishing apparatus and a lens polishing method capable of efficiently and accurately polishing an optical lens having high surface accuracy.

The present invention employs the following means in order to solve the above problems.
A first lens polishing apparatus according to the present invention includes a polishing portion having a spherical polishing surface that comes into surface contact with a lens to be processed, and a holder that holds the lens to be processed and presses the lens to be processed against the polishing surface. In a lens polishing apparatus including a pressing portion, the polishing surface is replaceable, and the holding pressing portion is swung around a first swing axis passing through the spherical core of the polishing surface with respect to the polishing portion. The swinging mechanism, the second swinging mechanism swinging the polishing part around the second swinging axis passing through the spherical core with respect to the holding pressing part, and the spherical core as the polishing surface is changed Control that drives at least the first swing mechanism when arranged on the polishing unit side, and drives at least the second swing mechanism when the spherical core is arranged on the holding and pressing unit side. And a portion.

  In this lens polishing apparatus, when the polishing surface is convex, the spherical core is arranged on the polishing portion side. Therefore, when the holding pressing portion is oscillated by driving the first oscillating mechanism, Even if a frictional force is generated between the polishing surface and the polishing surface, the direction of the rotational torque and the swing direction in the holding and pressing portion can be matched. In addition, when the polishing surface is concave, the spherical core is disposed on the holding and pressing portion side, so that when the polishing portion is swung by driving the second rocking mechanism, the lens is moved between the lens to be processed and the polishing surface. Even if a frictional force is generated, the direction of the rotational torque in the polishing portion and the swinging direction can be matched. Therefore, in any case, the holding pressing portion or the polishing portion can be smoothly swung in a state where the pressing direction by the holding pressing portion and the spherical axis passing through the spherical core of the polishing surface are matched.

The second lens polishing apparatus according to the present invention is the first lens polishing apparatus, characterized in that the first swing shaft and the second swing shaft coincide with each other.
In this lens polishing apparatus, components related to the first swing shaft and the second swing shaft can be shared, and the lens polishing apparatus can be miniaturized.

Further, the third lens polishing apparatus according to the present invention is the first lens polishing apparatus, wherein the detection is performed to identify whether the spherical core is disposed on the polishing unit side or the holding pressing unit side. It has the part.
The lens polishing apparatus can cause the control unit to determine whether to drive at least one of the first swing mechanism and the second swing mechanism based on the detection result of the detection unit.

The fourth lens polishing apparatus according to the present invention is any one of the first to third lens polishing apparatuses, wherein the control unit includes the first swing mechanism and the second swing mechanism. The rocking angle is set, the rocking state of the polishing part and the holding pressing part are stopped at an arbitrary angle within the rockable range, and the stopped state is maintained.
This lens polishing apparatus can polish the lens to be processed in a state where the rotation center axis of the polishing surface is inclined with respect to the pressing direction. Therefore, the center position of the rocking process can be distributed and processed from the central part of the lens to be processed toward the outer peripheral part, and deep surface processing can be performed.

  The lens polishing method according to the present invention is a lens polishing method in which the lens to be processed is polished while bringing the lens to be processed into surface contact with a spherical polishing surface, and the spherical core of the polishing surface is on the polishing surface side. In the case where the lens to be processed is swung around the first swing axis passing through the spherical core with respect to the polishing surface, and when the spherical core is disposed on the lens to be processed side And a step of swinging the polished surface around a second swing axis passing through the spherical core with respect to the lens to be processed.

  In this lens polishing method, for example, when processing a concave lens, since the polishing surface is convex, the spherical core serving as the center of oscillation is on the polishing surface side, and the lens to be processed is oscillated with respect to the polishing surface side. it can. Therefore, even if a frictional force is generated between the lens to be processed and the polishing surface at the time of swinging, the direction of the rotational torque due to the frictional force and the swinging direction coincide with each other. The lens to be processed can be smoothly swung in a state where the spherical axis passing through the spherical core of the surface is matched. Further, when processing a convex lens, since the polishing surface is concave, the spherical core serving as the center of oscillation is the lens to be processed, and the polishing surface can be oscillated with respect to the lens to be processed. Accordingly, in this case as well, the polishing surface can be smoothly swung in the state where the pressing direction of the lens to be processed and the sphere core axis passing through the sphere core of the polishing surface coincide with each other by the same operation as described above.

The lens polishing method according to the present invention is the lens polishing method according to claim 5, wherein the lens to be processed and the polishing are made when the lens to be processed and the polishing surface are relatively swung. A step of changing the surface contact position by changing the positional relationship with the surface is provided.
This lens polishing method not only relatively swings the lens to be processed and the polishing surface, but also can change the surface contact range between the processing lens and the polishing surface. And uneven wear of the polished surface can be suppressed.

  According to the present invention, it is possible to suppress chattering and oozing of a lens to be processed during polishing, and it is possible to polish a lens having high surface accuracy efficiently and with high accuracy.

An embodiment according to the present invention will be described with reference to FIGS.
As shown in FIG. 1, the lens polishing apparatus 1 according to the present embodiment includes a polishing dish (polishing unit) 3 having a spherical polishing surface 3 a in surface contact with the lens 2 to be processed, and the lens 2 to be processed in a lens holder. A holding pressing portion 6 that holds the workpiece 2 against the polishing surface 3a and holds the holding pressing portion 6 with respect to the polishing plate 3 through the spherical core 7 of the polishing surface 3a. A first rocking mechanism 8 for rocking around, a second rocking mechanism 10 for rocking the polishing dish 3 around the second rocking axis C2 passing through the spherical core 7 with respect to the holding pressing part 6, and When the gantry 11 for mounting each component and the spherical core 7 is arranged on the polishing dish 3 side in accordance with the exchange of the polishing dish 3, the first swing mechanism 8 is driven and the spherical core 7 is held. When arranged on the pressing unit 6 side, the control unit 12 for driving the second swing mechanism 10 and the spherical core 7 are held on the polishing dish 3 side or held. And a detection sensor (detection unit) 13 that identifies whether the disposed either pressure section 6 side. The first swing axis C1 and the second swing axis C2 are both the same central axis of the swing shaft portion 50 described later.

The polishing dish 3 is formed in a convex shape for polishing a concave lens and is detachably screwed to one end 15a of a spindle 15 that rotates the polishing dish 3 about the central axis of the polishing surface 3a as shown in FIG. ing.
The spindle 15 is a component of the lower shaft unit 16. The lower shaft unit 16 includes a spindle case 17, spindle bearings 18A and 18B for rotatably holding the spindle 15 in the spindle case 17, inner ring portions 18a and outer rings of the spindle bearings 18A and 18B. A small collar 20 and a large collar 21 for maintaining the distance between the portions 18b, and an inner presser nut 22 fitted to the spindle 15 for applying a preload to the inner ring portions 18a of the spindle bearings 18A and 18B, In order to apply a preload to the outer ring portion 18b of the spindle bearings 18A and 18B, an outer presser nut 23 screwed with the spindle case 17 is provided.

  The other end 15 b of the spindle 15 is connected to a spindle rotating mechanism 25 that rotates the spindle 15 with respect to the spindle case 17. The spindle rotation mechanism 25 includes a spindle motor 27 that is further fixed to a motor bracket 26 that is fixedly connected to the spindle case 17, a motor pulley 28 that is disposed on a rotation shaft 27 </ b> A of the spindle motor 27, and the other end 15 b of the spindle 15. A spindle pulley 31 fixed to the motor pulley 28 via a fixing nut 30, and an outer peripheral surface of the spindle pulley 31 and a rotating belt 32 wound around the outer peripheral surface of the motor pulley 28.

  A talai 33 is fixed to the one end 15a side of the spindle 15 so as not to leak water. The tarai 33 includes a polishing nozzle 36 for supplying a polishing liquid 35 used for polishing, and a right drain 37 for returning the used polishing liquid 35 to a polishing liquid tank (not shown) as shown in FIG. A left drain port 38 is arranged.

The holding and pressing portion 6 is formed in a cylindrical shape and constitutes an upper shaft unit 40 together with a pressure shaft case 39 that holds the holding and pressing portion 6 inside.
The holding and pressing unit 6 includes a pressure shaft 41 to which the lens holder 5 is connected, and a pressure member 42 that is connected to a pressure source (not shown) and presses the pressure shaft 41 from the axial direction of the pressure shaft 41. ing.

The lens holder 5 is connected to a vacuum suction device (not shown), and sucks and holds the lens 2 to be processed. The pressure shaft 41 is held so as to be capable of moving back and forth in the axial direction with respect to the pressure shaft case 39 via a bearing (not shown).
As shown in FIG. 4, the pressing shaft 41 is provided with a concave portion 41 </ b> A on the tip surface 41 a. In the recess 41A, lens holder bearings 43A and 43B for holding the lens holder 5 rotatably inside are maintained, and the distance between the inner ring portion 43a and the outer ring portion 43b of the lens holder bearings 43A and 43B is maintained. Small collar 45 and large collar 46, lens holder bearings 43A and 43B, outer presser nuts 47 screwed into pressure shaft 41 to apply preload to outer ring portions 43b of lens holder bearings 43A and 43B, and lens holder bearings 43A and 43B. In order to apply a preload to the inner ring portion 43a, an inner presser nut 48 fitted to the lens holder 5 is provided.

As shown in FIG. 1, the first swing mechanism 8 includes a swing shaft portion 50 disposed on the first swing shaft C <b> 1 and an upper shaft swing arm connected to one end 50 a of the swing shaft portion 50. 51, an upper shaft oscillating motor 55 connected to the other end 50b of the oscillating shaft portion 50 via a coupling 52 and provided with an upper shaft speed reducer 53, and a cylindrical quill covering the oscillating shaft portion 50 56.
The swing shaft portion 50 includes a swing shaft main body 57 and a flange portion 58 having an outer diameter larger than that of the swing shaft main body 57 and connected to the one end 57a side of the swing shaft main body 57. . An inner stopper 56A that protrudes radially inward and an outer stopper 56B that protrudes radially outward are disposed at one end 56a of the quill 56.

  The swinging shaft portion 50 is fitted on the swinging shaft main body 57 and is fitted in the quill 56 so as to be pressed by the flange portion 58 and the inner stopper 56A. The upper shaft oscillating bearing 61 that is externally fitted to the end 57 b side and is fitted to the quill 56 is rotatably supported with respect to the quill 56. Between the angular bearing 60 and the upper shaft swing bearing 61, a small collar 62 for maintaining the distance between the inner ring portions 60a and 61a and a large collar for maintaining the distance between the outer ring portions 60b and 61b. A color 63 is arranged. The upper shaft rocking bearing 61 includes an inner holding nut 65 that is screwed to the other end 57 b side of the rocking shaft main body 57, and an outer holding nut 66 that is screwed to the inner peripheral surface of the other end 56 b of the quill 56. Thus, a preload is supplied to the inner ring portions 60a and 61a and the outer ring portions 60b and 61b, respectively.

  The quill 56 is inserted into a case 68 fixed to a frame-shaped unit base 67 fixed on the gantry 11, and the case 68 is attached to an outer stopper 56 </ b> B protruding from the outer peripheral surface of the quill 56 on one end 56 a side. In the abutted state, the quill 56 is fixed to the case 68 by a quill nut 70 inserted from the other end 56b side. An upper shaft swing motor bracket 71 to which the upper shaft speed reducer 53 is fixed is fixed to the unit base 67.

The upper shaft swing arm 51 is connected to the swing shaft portion 50 on one end 51a side. On the other end 51 b side of the upper shaft swing arm 51, a vertical drive mechanism 72 for vertically moving the upper shaft unit 40 with respect to the spherical core 7 is disposed.
The vertical drive mechanism 72 is disposed on the upper shaft connecting portion 73 connected to the pressure shaft case 39, the ball screw 75 screwed to the upper shaft connecting portion 73, and the upper shaft swinging arm 51. A guide 76 that guides the portion 73 in the vertical direction along the upper shaft swing arm 51 and an upper shaft motor 77 that rotates the ball screw 75 are provided.

  As shown in FIGS. 1 and 3, the second swing mechanism 10 shares the swing shaft portion 50 with the first swing mechanism 8, and is connected to the one end 56 a side of the quill 56. 78 and a lower shaft reduction gear 82 having a motor side gear 81 meshed with an arm side gear 80 formed at one end 78 a of the lower shaft swing arm 78 and fixed to the unit base 67. A lower shaft swing motor 83 and a lower shaft connecting portion 84 for connecting the lower shaft swing arm 78 and the lower shaft unit 16 are provided.

  The lower shaft oscillating arm 78 and the quill 56 are rotatably connected via a lower shaft oscillating bearing 85. The lower shaft oscillating bearing 85 includes an inner presser nut 86 for applying a preload to the inner ring portion 85a of the lower shaft oscillating bearing 85 from the one end 56a side of the quill 56 with the outer stopper 56B of the quill 56, In order to apply a preload to the outer ring portion 85 b of the shaft swing bearing 85, the shaft is pressed by an outer pressing member 87 fixed to the side surface of the lower shaft swing arm 78.

The control unit 12 sets each swing angle of the first swing mechanism 8 and the second swing mechanism 10 and determines whether the polishing plate 3 and the holding pressing unit 6 are swinging at an arbitrary angle within the swingable range. Controls stopping and maintaining the stopped state.
When the polishing surface 3a of the polishing plate 3 is convex on the guide 76 of the vertical drive mechanism 72, the detection sensor 13 does not reach the upper shaft connecting portion 73, and when the polishing surface 3a is concave. It is arranged at a position where the upper shaft connecting portion 73 reaches.

Next, a lens polishing method by the lens polishing apparatus 1 according to the present embodiment will be described.
In this lens polishing method, when the processing lens 2 is brought into surface contact with the polishing surface 3a and pressed, the processing lens 2 is polished when the spherical core 7 of the polishing surface 3a is disposed on the polishing dish 3 side. When the ball core 7 is swung around the first rocking axis C <b> 1 passing through the spherical core 7 with respect to the surface 3 a and the spherical core 7 is disposed on the processed lens 2 side, the polished surface 3 a is moved with respect to the processed lens 2. A step of swinging around the second swing axis C2 passing through the spherical core 7 is provided. That is, control is performed to change the swing target depending on whether the lens 2 to be processed is a concave lens or a convex lens. Therefore, the following description will be made for each shape of the lens to be processed.

First, a case where a concave lens is processed will be described.
First, before the polishing is started, the first swing mechanism 8 and the second swing mechanism 10 are initially set so that the axial directions of both the pressure shaft 41 and the spindle 15 coincide. Next, the upper shaft motor 77 of the vertical drive mechanism 72 is driven to move the pressure shaft case 39 to a predetermined initial position, and the polishing dish 3 for the concave lens is screwed into one end 15 a of the spindle 15. Since the polishing dish 3 is convex, the spherical core 7 of the polishing surface 3a is arranged on the polishing dish 3 side. Then, a vacuum suction device (not shown) is driven to hold the workpiece lens 2 on the lens holder 5 by suction.

  In this state, the upper shaft motor 77 is driven to move the upper shaft unit 40 along the guide 76 toward the spherical core 7. The upper shaft motor 77 is stopped when the lens 2 to be processed is at a predetermined setting position in the vicinity of the polishing dish 3. At this time, as shown in FIG. 1, since the upper shaft connecting portion 73 does not reach the detection sensor 13, the control unit 12 recognizes that the shape of the lens 2 to be processed is a concave lens shape.

  Subsequently, the lens processing condition is called by inputting the product number of the lens 2 to be processed to the control unit 12. Instead of inputting a product number, a predetermined product number may be selected from a group of product numbers displayed in advance. Thereby, the determined machining condition is called.

  Next, a pressure source (not shown) is driven and the pressure shaft 41 is pressed by the pressure member 42 to bring the lens 2 to be processed into contact with the polishing dish 3 at a predetermined pressure. In this state, the polishing liquid 35 is caused to flow out from the polishing liquid nozzle 36, and the spindle motor 27 is driven to rotate the spindle 15 about the axis via the rotating belt 32. Here, since the lens holder 5 is rotatably supported with respect to the pressure shaft 41, the rotational force of the spindle 15 is transmitted to the lens holder 5 through the lens 2 to be processed, and the lens holder 5 is covered. The processing lens 2 rotates.

Since the spherical core 7 of the polishing surface 3a is disposed on the polishing plate 3 side, the process of swinging the lens 2 to be processed around the first swing axis C1 passing through the spherical core 7 with respect to the polishing surface 3a. Do.
Here, in the case of the processed lens 2 having a concave lens deep surface shape in which the radius of curvature (R) of the lens is, for example, D / R> 1.5 with respect to the lens outer diameter (D), the entire lower shaft unit 16 is The rocking motion by the first rocking mechanism 8 is distributed from the central portion of the polishing dish 3 to the outer peripheral portion by inclining around the spherical core 7. For this reason, first, the lower shaft swing motor 83 is driven in a state of being decelerated to a predetermined rotational speed by the lower shaft speed reducer 82, and the lower shaft swing arm 78 is rotated at a predetermined speed around the spherical core 7. . Then, by stopping the driving of the lower shaft swing motor 83, the spindle 15, that is, the rotation center axis of the polishing plate 3 is inclined at a predetermined angle (D1) with respect to the pressing shaft 41.

  When swinging, the swing shaft portion 50 is rotated by driving the top shaft swing motor 55 while being decelerated to a predetermined rotational speed by the top shaft reducer 53. Thus, when the upper shaft swing arm 51 is inclined at a predetermined angle with respect to the spindle 15, the rotation direction of the upper shaft swing motor 55 is reversed, and the upper shaft swing arm 51 is moved in the reverse direction. Thus, as shown in FIG. 5, the upper shaft swing arm 51 is swung around the spherical core 7 within a predetermined upper shaft swing width (W 1), and the lens 2 to be processed is desired by the polishing dish 3. Polish to the shape of.

Next, a case where a convex lens is processed will be described.
First, before the polishing is started, the first swing mechanism 8 and the second swing mechanism 10 are initially set, and then the upper shaft motor 77 of the vertical drive mechanism 72 is driven to bring the pressure shaft case 39 to a predetermined initial position. As shown in FIG. 6, the polishing dish 88 for the convex lens is screwed to the one end 15 a of the spindle 15. Since the polishing dish 88 is concave, the spherical core 90 of the polishing surface 88a is disposed on the processed lens 91 side. That is, the polishing dish 88 is in a state of being moved relatively downward with respect to the swinging shaft portion 50 as compared with the case of the concave lens processing.

  In this state, a vacuum suction device (not shown) is driven to the lens holder 92 to suck and hold the lens 91 to be processed, and the upper shaft motor 77 is driven to move the upper shaft unit 40 along the guide 76 to the spherical core 90 side. To do. The upper shaft motor 77 is stopped when the lens 91 to be processed reaches a predetermined set position near the polishing plate 88. At this time, since the upper shaft connecting portion 73 reaches the detection sensor 13, the control unit 12 recognizes that the shape of the lens 91 to be processed is a convex lens shape.

  Subsequently, the product number of the lens 91 to be processed is input to the control unit 12 to call the lens processing conditions. Then, a pressure source (not shown) is driven and the pressure shaft 41 is pressed by the pressure member 42 so that the lens 91 to be processed is brought into contact with the polishing dish 88 with a predetermined pressure. In this state, the polishing liquid 35 is caused to flow out from the polishing liquid nozzle 36, the spindle motor 27 is driven to rotate the spindle 15 about the axis via the rotating belt 32, and the lens 91 is rotated together with the lens holder 92.

Since the spherical core 90 of the polishing surface 88a is disposed on the processed lens 91 side, the polishing surface 88a is swung around the second swing axis C2 passing through the spherical core 90 with respect to the processed lens 91. I do.
Here, in the case of the processed lens 91 having a convex lens deep surface shape in which the radius of curvature (R) of the lens is, for example, D / R> 1.5 with respect to the lens outer diameter (D), the entire upper shaft unit 40 is The rocking motion by the second rocking mechanism 10 is distributed from the central portion of the polishing dish 88 to the outer peripheral portion by tilting around the spherical core 90. For this reason, first, the upper shaft swinging motor 55 is driven in a state of being decelerated to a predetermined rotational speed by the upper shaft speed reducer 53, and the upper shaft swinging arm 51 is rotated around the spherical core 90 at a predetermined speed. . Then, by stopping the driving of the upper shaft oscillating motor 55, the pressure shaft 41 is inclined at a predetermined angle with respect to the spindle 15 as described above.

  When swinging, the lower shaft swing motor 83 is driven with the lower shaft speed reducer 82 decelerated to a predetermined rotational speed, and the lower shaft swing arm 78 is moved at a predetermined angle with respect to the pressure shaft 41. Tilt until. Thereafter, the rotation direction of the lower shaft swing motor 83 is reversed, and the lower shaft swing arm 78 is moved in the reverse direction. In this way, as shown in FIG. 7, the lower shaft swing arm 78 is swung around the spherical core 90 within a predetermined lower shaft swing width (W 2), and the lens 91 to be processed is desired by the polishing dish 88. Polish to the shape of.

  According to the lens polishing apparatus 1 and the lens polishing method, when the polishing surface 3a of the polishing dish 3 is convex, the spherical core 7 is disposed on the polishing dish 3 side, so that the first swing mechanism 8 is driven. Thus, even when a frictional force is generated between the lens 2 to be processed and the polishing surface 3a when the holding pressing portion 6 is swung, the direction of the rotational torque and the swinging direction in the holding pressing portion 6 are matched. Can do. Further, when the polishing surface 88a is concave, the spherical core 90 is disposed on the processed lens 91 side, so that the processed lens 91 is driven when the polishing dish 88 is swung by driving the second rocking mechanism 10. Even if a frictional force is generated between the polishing surface 88a and the polishing surface 88a, the direction of the rotational torque in the polishing plate 88 and the swinging direction can be matched. Accordingly, in any case, the holding and pressing unit 6 or the polishing plates 3 and 88 are moved in a state where the pressing direction by the holding and pressing unit 6 and the spherical axis C passing through the spherical cores 7 and 90 of the polishing surfaces 3a and 88a are matched. The lens can be smoothly swung, and chattering and omission of the processed lenses 2 and 91 during polishing can be suppressed, and a lens with high surface accuracy can be polished efficiently and with high accuracy.

In addition, since the detection sensor 13 is provided, one of the first swing mechanism 8 and the second swing mechanism 10 can be driven by the control unit 12 based on the detection result by the detection sensor 13.
At this time, the processing lens 2 and 91 can be polished by the control unit 12 in a state where the rotation center axis of the polishing surfaces 3a and 88a is inclined with respect to the pressing direction, and the center position of the oscillating processing can be determined. 2,91 can be distributed and processed from the central portion toward the outer peripheral portion. Accordingly, the polishing pressure becomes less susceptible to the influence of gravity, and the shortage of the swinging range can be compensated, and a change in the applied pressure can be suppressed and the polishing surfaces 3a and 88a can be pressurized in a well-balanced manner. As a result, it is possible to perform deep surface processing of the lens 2 and 91 to be processed.

  Further, since the first swing axis C1 and the second swing axis C2 coincide, the swing shaft portion 50 can be shared between the first swing mechanism 8 and the second swing mechanism 10. And the number of parts can be reduced.

  Here, by changing the setting of the processing conditions in the control unit 12, the second swing mechanism 10 is driven while the first swing mechanism 8 is driven and the upper shaft unit 40 is swung as described above. By changing the rocking angle of the lower shaft unit 16 every time a predetermined time elapses (the rocking angle is intermittently changed), the positional relationship between the lens to be processed 2 and 91 and the polishing surfaces 3a and 88a is changed. The contact lens may be changed to polish the processed lenses 2 and 91.

  Alternatively, the setting of the processing conditions in the control unit 12 is changed so that the swing direction of the upper shaft unit 40 by the first swing mechanism 8 and the swing direction of the lower shaft unit 16 by the second swing mechanism 10 are Even if polishing is performed while changing the positional relationship between the lens to be processed 2 and 91 and the polishing surfaces 3a and 88a by continuously swinging in opposite directions when passing through the respective swing center positions. Good. In this case, the swing speeds of the upper shaft unit 40 and the lower shaft unit 16 may be the same or different from each other.

  That is, there is a correlation between the operation of swinging the workpiece lens 2 and 91 about the first swing axis C1 and the operation of swinging the polishing plates 3 and 88 about the second swing axis C2. The processing lens 2, 91 around the first swing axis C1 and the polishing plates 3, 88 around the second swing axis C2 are continuously synchronized in accordance with the processing progress of the processed lenses 2, 91. Polishing may be performed by swinging. Alternatively, polishing may be performed by intermittently changing the swing angle of the other swing shaft with respect to the swing shaft.

  Thus, after changing the positional relationship between the holding member 6 on the upper unit 40 side and the polishing dishes 3 and 88 on the lower shaft unit 16 side, or by changing the positional relationship according to the progress of polishing during polishing, polishing is performed. By doing so, it is possible to suppress the so-called asses and coma on the surface to be polished of the processed lenses 2 and 91 and the uneven wear on the polishing dish, which is so-called offset.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the pressure shaft 41 is movable only in the axial direction with respect to the pressure shaft case 39, but a rotation mechanism is provided so that the pressure shaft 41 can rotate relative to the pressure shaft case 39. It does not matter. In this case, it is possible to efficiently polish the small-diameter workpiece lens. Further, although the swinging is switched by the detection sensor 13, it may be manually identified and input to the control unit without providing the detection sensor 13.

1 is a schematic front view including a partial cross-sectional view showing a lens polishing apparatus according to an embodiment of the present invention. It is an expanded block diagram including the partial cross section figure which shows the principal part of the lens grinding | polishing apparatus which concerns on one Embodiment of this invention. FIG. 2 is a diagram illustrating a state in which a spherical core is swung in a lens polishing apparatus according to an embodiment of the present invention as viewed from the direction A in FIG. 1. It is an expanded block diagram including the partial cross section figure which shows the principal part of the lens grinding | polishing apparatus which concerns on one Embodiment of this invention. FIG. 2 is a diagram illustrating a state in which a spherical core is swung in a lens polishing apparatus according to an embodiment of the present invention as viewed from the direction A in FIG. 1. It is an expanded block diagram including the partial cross section figure which shows the principal part of the lens grinding | polishing apparatus which concerns on one Embodiment of this invention. FIG. 2 is a diagram illustrating a state in which a spherical core is swung in a lens polishing apparatus according to an embodiment of the present invention as viewed from the direction A in FIG. 1.

Explanation of symbols

1 Lens polisher 3,88 Polishing dish (polishing part)
3a, 88a Polishing surface 6 Holding pressing part 7, 90 Spherical core 8 First swing mechanism 10 Second swing mechanism 12 Control unit 13 Detection sensor (detection unit)
C1 first swing axis C2 second swing axis

Claims (6)

In a lens polishing apparatus comprising: a polishing portion having a spherical polishing surface in surface contact with a lens to be processed; and a holding pressing portion that holds the lens to be processed and presses the lens to be processed against the polishing surface.
The polishing surface is replaceable,
A first swing mechanism that swings the holding pressing portion around the first swing axis that passes through the spherical core of the polishing surface with respect to the polishing portion;
A second rocking mechanism for rocking the polishing part around the second rocking axis passing through the spherical core with respect to the holding pressing part;
When the spherical core is disposed on the polishing portion side in accordance with the replacement of the polishing surface, at least the first swing mechanism is driven, and when the spherical core is disposed on the holding and pressing portion side. A lens polishing apparatus comprising: a control unit that drives at least the second swing mechanism.   2. The lens polishing apparatus according to claim 1, wherein the first swing shaft and the second swing shaft coincide with each other.   The lens polishing apparatus according to claim 1, further comprising a detection unit that identifies whether the spherical core is disposed on the polishing unit side or the holding pressing unit side.   The control unit sets each swing angle of the first swing mechanism and the second swing mechanism, and sets the swing state of the polishing unit and the holding pressing unit at an arbitrary angle within a swingable range. The lens polishing apparatus according to any one of claims 1 to 3, wherein stop and maintenance of the stop state are performed. In the lens polishing method of polishing the lens to be processed while pressing the lens to be processed while bringing the lens into surface contact with a spherical polishing surface,
When the spherical core of the polishing surface is disposed on the polishing surface side, the lens to be processed is swung around the first swing axis passing through the spherical core with respect to the polishing surface, and the spherical core is When arranged on the lens to be processed, the lens includes a step of swinging the polished surface about the second swing axis passing through the spherical core with respect to the lens to be processed. Polishing method. And a step of changing a surface contact position by changing a positional relationship between the lens to be processed and the polishing surface when the lens to be processed and the polishing surface are relatively swung. The lens polishing method according to claim 5.

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