JP2002079448A - Lens chamfering device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens chamfering device capable of reducing the working contact pressure to a lens, adjusting the work contact pressure, preventing the generation of the pitching on a chamfered part of the lens by unifying the working contact pressure regardless of a material and the shape of the lens, executing the uniform and fine chamfering work without damaging a part excluding the chamfered part, and elongating the service life of the chamfering member. SOLUTION: This lens chamfering device comprises a lens holding tool 1 for holding a lens 2, a motor 8 for rotating the lens 2 and the lens holding tool 1, a disc-shaped rotary symmetrical hard grinding wheel 9 executing the chamfering work of the lens 1, a wheel spindle part 14 for holding the hard grinding wheel 9, a motor 21 for forcibly rotating the hard grinding wheel 9 and the wheel spindle part 14, motors 35, 39 for rotating ball screws 34, 38 for moving the hard grinding wheel 9 to an arbitrary position, a pressure adjusting member 16 for adjusting the contact pressure in working, and a θtable 31 for adjusting a contact angle of the lens 2 and the hard grinding wheel 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for chamfering an end face of a lens.

[0002]

2. Description of the Related Art Japanese Utility Model Publication No. Hei 6-11755 proposes a lens chamfering jig in which a sanding dish is improved. As shown in FIG. 6, the chamfering jig includes a support shaft 102 fixed to a jig mounting portion 101 mounted on a swing shaft 100 of a lens polishing machine, a center plate 103, and both ends of the center plate 103. Left and right side plates 104 attached to the part
The center plate 103 is opened at the lower and front and rear sides and has a width larger than the outer diameter of the lens 108 to be chamfered.
A jig portion 105 attached via the 3a; an elastic sheet 106 which is stretched between lower ends of side plates 104 of the jig portion 105 to cover a lower opening portion of the space portion;
And a chamfering member 107 that is mounted at a position corresponding to the side surface of the lens 108 of the elastic sheet 106 and is pressed against the chamfered portion of the lens 108.

On the other hand, the lens 108 to be chamfered is
It is held by the chuck 109 with the chamfered portion (peripheral portion) facing upward, and is rotatable by the lens mounting shaft 110.

In the chamfering jig having the above-described structure, when the chamfering member 107 is pressed against the chamfered portion of the lens 108, the elastic sheet 106 is bent upward. In close contact.

Thereafter, the swing shaft 100 is swung in the directions of arrows A and B, and the lens mounting shaft 110 is rotated.
The chamfering member 107 swinging with respect to the rotating lens 108 chamfers a chamfered portion (peripheral portion) of the lens 108. Then, at the time of this chamfering, a grinding liquid is supplied toward the lens 108.

[0006]

However, in the above chamfering jig, the processing contact pressure of the chamfering member 107 to the lens 108 is the weight of the jig mounting portion 101, and the pressure cannot be adjusted. There is a disadvantage that the processing contact pressure on the portion is large and pitching occurs in the chamfered portion of the lens 108.

Further, since the working contact pressure cannot be adjusted, there is a disadvantage that the adjustment of the chamfer amount is limited to only the working time. In addition, there is a disadvantage that even a very small amount of chamfering, for example, chamfering of 0.1 mm or less cannot be performed with uniform accuracy.

Further, since the change of the lens diameter cannot be handled unless the chamfering member 107 is replaced, there is a disadvantage that the setup time is increased.

Further, the chamfering member 107 is swung every time one of the processing of the lens 108 is performed, so that the entire surface of the chamfering member 107 is used. Had the disadvantage that the surface was scratched when it came into contact with the surface.

Accordingly, the present invention has been made in view of the above-mentioned problems of the prior art, and has been made to reduce the processing contact pressure on a lens and to adjust the processing contact pressure,
Irrespective of the material and shape of the lens, the processing contact pressure can be kept constant, preventing chipping from occurring in the chamfered part of the lens, and performing a very small amount of chamfering without scratches other than in the chamfered part. It is an object of the present invention to provide a lens chamfering apparatus and method which can be easily set up and have a long life of a chamfering member.

[0011]

In order to achieve the above object, a lens chamfering apparatus according to claim 1 of the present invention comprises:
In a lens chamfering apparatus for chamfering an end surface of a lens, a lens holding means for holding the lens, a workpiece rotating means for rotating the lens or the lens holding means, and a disk-shaped chamfering for the lens Rotationally symmetric hard grindstone, grinding fluid supply means for supplying a grinding fluid to the hard grindstone, grindstone holding means for holding the hard grindstone, grindstone rotating means for forcibly rotating the hard grindstone and the grindstone holding means, A whetstone moving means for moving the hard whetstone to an arbitrary position, a pressure adjusting means for adjusting a contact pressure during processing, and a whetstone angle adjusting means for adjusting a contact angle between the lens and the hard whetstone. And

According to a second aspect of the present invention, there is provided a lens chamfering method for chamfering an end surface of a lens, comprising: a step of holding the lens; a step of rotating the lens; Applying a hard whetstone to the hard whetstone, moving the hard whetstone to the ridge of the lens end surface and applying the same at a constant contact pressure, rotating the hard whetstone, and after finishing the chamfering, the hard whetstone And releasing the lens from the lens.

According to the first aspect of the present invention, the lens is held in a state where the center is set to the lens holding means, and the lens is rotated together with the lens holding means by the workpiece rotating means. On the other hand, the grinding fluid is supplied to the hard grindstone by the grinding fluid supply means. The hard grindstone is rotatably held by the grindstone holding means, and the angle of contact of the hard grindstone when it contacts the lens is adjusted by the grindstone angle adjusting means. Then, the hard grindstone is moved to a predetermined position by the grindstone moving means, and while the processing surface of the hard grindstone is brought into contact with the edge ridge of the lens for chamfering,
The hard grindstone is rotated by the grindstone rotating means, and the contact pressure of the grindstone on the lens is adjusted by the pressure adjusting means to chamfer the lens.

According to the second aspect of the present invention, the lens is held in a state where the center is set to the lens holding means, and the lens is rotated together with the lens holding means by the workpiece rotating means. On the other hand, the grinding fluid is applied to the hard grindstone by the grinding fluid supply means. Next, the hard grindstone is brought into contact with the edge line of the lens at a constant contact pressure, and the hard grindstone is rotated by the grindstone rotating means to chamfer the lens. Then, the hard grindstone is separated from the chamfered lens.

[0015]

(Embodiment 1) Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 shows a lens chamfering apparatus according to the present embodiment, FIG. 1 (A) is a simplified perspective view, FIG. 1 (B) is a cross-sectional view showing a contact state between a lens and a hard grindstone, and FIG. 1B and 2 are cross-sectional views showing a lens holding unit, a grinding wheel holding unit, a grinding wheel rotating unit, and a pressure adjusting unit of the lens chamfering apparatus. FIGS. 1B and 2 show a state in which the processing contact angle between the lens and the hard grinding wheel is 45 degrees. ing.

As shown in FIG. 1B, a lens 2 as a glass optical element is provided with a lens holder 1 as lens holding means.
Both ends are projected from the lens holder 1 so as to pass through a hole 1b provided on the central axis 1a of the lens holder 1a, and are adhered and fixed in a state where the core is extended, as shown in FIG.
The lens holder 1 is held by the chuck 3.

A chuck 3 functioning as a holding means for the lens holder 1 is fixed on a stage 4 which is rotatably mounted and supported on a chamfering device base (not shown). The stage 4 is connected to a motor 8 via a pulley 5, a belt 6, and a pulley 7, and is held by the chuck 3 by rotating the stage 4 by driving the motor 8 as a workpiece rotating unit. The lens holder 1 is rotated about its central axis 1a.

On a lens chamfering device base (not shown),
A nozzle 40, which is a means for supplying a grinding liquid to the lens 2 and a hard grindstone 9 described later, is provided. The grinding fluid supply means may store the grinding fluid (not shown) in a tank and immerse the hard grindstone 9 before processing, or spray the grinding fluid mist from the nozzle 40, in addition to pouring by the nozzle 40. May be.

Further, two guides 37 are fixed in parallel to the X-axis direction on a lens chamfering device base (not shown), and an L-shaped iter 36 is mounted on the guide 37 in the X-axis direction. Mounted movably. Two guides 3
7, the ball screw 3 connected to the motor 39
8 are arranged in parallel with the guide 37. The ball screw 38 is attached to the iter 36 via a screw member such as a ball nut, and when the ball screw 38 is rotated by driving a motor 39 (forward rotation and reverse rotation),
The iter 36 reciprocates in the X-axis direction along a guide 37.

Two guides 33 are fixed to the front surface of the L-shaped rising side of the iter 36 in parallel to the Z-axis direction perpendicular to the X-axis and the vertical direction.
Above, an iter 32 is mounted so as to be movable in the Z-axis direction. Between the two guides 33, a ball screw 34 connected to a motor 35 is arranged in parallel with the guides 33. The ball screw 34 is attached to the ita 32 via a screw member such as a ball nut, and when the ball screw 34 is rotated by driving a motor 35 (forward rotation and reverse rotation), the ita 32 moves along the guide 33. To reciprocate in the Z-axis direction.

A hard grindstone 9 is held on the front surface of the iter 32 via a θ table 31 as a grindstone angle adjusting means and a housing 12. The above-mentioned ita 36, guide 37, ball screw 38, motor 39, and ita 3
2, a guide 33, a ball screw 34, and a motor 35 constitute a whetstone moving means for moving the hard whetstone 9 in the X-axis direction and the Z-axis direction. The rotation of the ball screw 38 driven by the motor 39 causes the X of the hard whetstone 9 to move. The height position of the hard grindstone 9 can be determined by adjusting the position in the axial direction and rotating the ball screw 34 by driving the motor 35.

In the above construction, the whetstone moving means is not limited to the guides 37 and 33, the ball screws 38 and 34, and the motors 39 and 35. Any means capable of directly moving the ita 36 and the ita 32 can be used. An air cylinder may be used, and a linear motor or a voice coil motor may be used.

The θ table 31 is attached to the iter 32 so as to be rotatable about a rotation axis orthogonal to the X axis and the Z axis. And, the θ table 31
Rotational positioning of an arbitrary angle θ around the rotation axis can be set.

The housing 12 is provided with the θ table 3
The housing 12 holds a whetstone shaft 14 as a whetstone holding means for holding the hard whetstone 9 via a platform 10. The grinding wheel shaft part 14
It comprises a spline shaft 11, a ball spline 15, and a ball spline holding shaft 14a.

The hard grindstone 9 is a disk-shaped, rotationally symmetric type, and is fixedly adhered to a gantry 10 as a grindstone holder, and its end face (plane portion) is a processing surface. The platform 10 is detachably held at the tip of the spline shaft 11, and when the platform 10 is attached to the spline shaft 11, the center axis of the hard grindstone 9 and the center axis of the spline shaft 11 are coaxial. It has become. Hereinafter, the central axis of the hard grindstone 9 and the central axis of the spline shaft 11 are referred to as an axis a.

The spline shaft 11 is, as shown in FIG.
The tip end of the ball spline 15 that is inserted into the ball spline holding shaft 14a and that holds the table 10 protrudes from the tip of the ball spline holding shaft 14a, and the spline shaft passage of the ball spline holding shaft 14a. 14c and the ball spline shaft 11
Is projected from the upper portion of the ball spline holding shaft 14a, and is held at the center of the ball spline holding shaft 14a. In other words, the spline shaft 11 is
4 passes through the shaft center 14b, and the shaft center 14b of the grinding wheel shaft portion 14.
Above, it can move directly along the axis a. Therefore, the axis a of the grinding wheel shaft portion 14 coincides with the axis a, and as shown in FIG. 1, the direction of the axis a is turned around the rotation axis of the θ table 31 by the θ table 31, The spline shaft 11 can move directly along a set machining contact angle θ which is an angle between the axis b and the axis a parallel to the Z axis. Therefore, by setting the θ table 31 as the grindstone angle adjusting means to an arbitrary angle θ, the axis a is fixed in a state of being inclined at an arbitrary angle θ with respect to the axis center 1 a of the lens holding shaft 1, The processing contact angle θ of the grindstone 9 is determined to an arbitrary angle θ.

The grinding wheel angle adjusting means is not limited to the θ table 31 as long as it can set an arbitrary angle θ and fix the housing 12.

The hard grinding stone 9 has an abutting surface (processed surface) during the chamfering process with the end surface (flat portion) abutting against the lens 2.
Has a hardness that does not cause elastic deformation. For example, a metal (C
It has a structure in which abrasive grains (diamond, cerium oxide, alumina, zirconia, carbon, etc.) are bound by a binding material made of u, Zn, Ni, Fe, etc. The binder may be not only the above-mentioned metal but also an epoxy-based resin or a phenol-based resin, and an appropriate whetstone material is used depending on the material and shape of the lens 2.

The ball spline holding shaft 14a is rotatably held in the housing 12 via the bearing 13 coaxially with the shaft center 14b of the grinding wheel shaft portion 14. The ball spline holding shaft 14a is connected to the motor 21 via a belt 18 spanned between a pulley 17 fixed to the ball spline holding shaft 14a and a pulley 19 fixed to the motor 21. It is designed to be rotated by driving. That is, the grinding wheel shaft 1
The wheel 4 is rotated around the center 14b of the grinding wheel, and the hard grinding wheel 9 is also rotated around the axis a which is coaxial with the center 14b of the grinding wheel.

The motor 21 as the grinding wheel rotating means includes:
It is fixed to the housing 12 via an attachment member 19, and can be shifted by a control device (not shown).

The upper end of the ball spline holding shaft 14a is a cavity 14a having an open upper portion.
The bottom of 4d is in communication with the spline shaft passage 14c. A spring 23 as a pressing member having an outer diameter smaller than that of the cavity 14d and longer than the depth of the cavity 14d is inserted into the cavity 14d along the spline shaft 11 coaxially with the grinding wheel shaft center 14b. The spline shaft 11 has a spring 23
22 is a spline shaft drop prevention member having an outer diameter larger than the outer diameter of the spline shaft and smaller than the cavity 14d.
Is fixed so as to be located between the spring 23 and the bottom of the cavity 14d coaxially with the whetstone shaft center 14b. Top 22
It is larger than the diameter of the spline shaft passage 14c,
The top 22 is locked to the bottom of the cavity 14d, thereby preventing the spline shaft 11 from dropping from the ball spline holding shaft 14a. The end of the spring 23 and the top 22
Are brought into contact with each other, and the top 22 is pressed by the spring 23, so that a contact pressure between the hard grindstone 9 and the lens 2 is generated.

At the upper end of the ball spline holding shaft 14a in which the cavity 14d is formed, a pressure adjusting member 1 serving as a pressure adjusting means is screwed into a threaded portion formed on the outer periphery thereof.
6 is mounted coaxially with the whetstone shaft center 14b. The pressure adjusting member 16 has a concave shape, and the force of the spring 23 pressing the top 22 is reduced by screwing the pressure adjusting member 16 while the end of the spring 23 is in contact with the bottom surface of the concave portion. It is adjustable.

At the center of the upper surface of the pressure adjusting member 16, a hole 16a having a diameter larger than that of the spline shaft 11 is provided.
The upper end of the spline shaft 11 is projected from the pressure adjusting member 16 through the hole 16a, and the spline shaft 11 and the pressure adjusting member 16 do not interfere with each other.
Are moved along the direction of the axis a and the screwing of the pressure adjusting member 16 is performed. Further, a scale 1 for displaying the position of the pressure adjusting member 16 is provided at the upper end of the spline shaft 11.
1a is provided.

Next, a lens chamfering method using the lens chamfering apparatus having the above-described configuration will be described. First, the lens holder 1 having the lens 2 adhered and held is held by the chuck 3 fixed to the stage 4, and the motor 8 as a workpiece rotating means is connected to the lens holder 1 via the pulley 7, the pulley 5, and the belt 6.
The lens holder 1 and the lens 2 are forcibly rotated together around the central axis 1a of the lens holder 1.

On the other hand, a grinding liquid is poured from the nozzle 40 onto the hard grindstone 9 and applied. The grinding fluid is supplied to the hard grindstone 9 in addition to the pouring from the nozzle 40, a grinding fluid tank (not shown) is prepared, and the hard grindstone 9 is immersed therein.
In addition to performing the chamfering while applying the grinding fluid to the end surface (plane portion) of the above, the chamfering may be performed by spraying the grinding fluid in the form of a mist onto the hard grindstone 9. It is not limited to any method as long as it is provided.

The edge 36 of the lens 2 is chamfered on the end face (flat face) of the hard grindstone 9 by using an iter 36 by a motor 37 via a guide 37 and a ball screw 38.
9 is advanced toward the lens 2 in parallel with the X axis by the driving of the
1 is moved up and down toward the lens 2 in parallel with the Z-axis by driving the motor 35 through the guide 33 and the ball screw 34, so that the end surface (flat portion) of the hard grindstone 9 comes into contact with the edge ridge of the lens 2. Move. At this time, the θ table 31 is turned so that the axis a becomes the set processing contact angle θ.

The above-mentioned hard grindstone 9 is attached to a spline shaft 11 while being adhered to and held by a stand 10. When the hard grindstone 9 comes into contact with the lens 2, the contact pressure between the lens 2 and the hard grindstone 9 is increased. The spline shaft 11 is transmitted to the spline shaft 11 via the spring 10, and the spline shaft 11 is pushed upward along the set processing contact angle θ by the action of the ball spline 15, and the top 22 fixed to the spline shaft 11 activates the spring 23. Push up.

On the other hand, the spring 23 is compressed by the screwing of the pressure adjusting member 16, and the top 22 is pushed back by receiving the load of the compressed spring 23, and at the same time, the spline shaft 11 and the base 10 The compressive load of the spring 23 is also transmitted to the hard grinding stone 9 as the processing contact pressure to the lens 2. At this time, if the amount of compression of the spring 23 is constant, a constant processing contact pressure is obtained when the amount of pushing of the hard grindstone 9 is constant due to the characteristics of the spring that can obtain a constant compression load. Here, as the load, the amount of screwing of the pressure adjusting member 16 is adjusted, and the set value is changed depending on the material of the lens 2 in the range of 5 gf to 100 gf. If the spring constant of the spring 23 is changed, a higher load can be applied.

The top 22 fixed to the spline shaft 11 is
In addition to transmitting the contact pressure between the hard grindstone 9 and the lens 2 to the spring 23, the spring 23 also prevents the spring 23 from dropping into the spline shaft passage 14c and also prevents the spline shaft 11 from falling from the ball spline holding shaft 14a. I have.

The amount of compression of the spring 23 is adjusted by the amount of screwing of the pressure adjusting member 16, and the amount is digitized by a scale 11a marked on the upper end of the spline shaft 11 so that it can be visually observed. The scale 11a indicates the amount of screwing of the pressure adjusting member 16, the amount of compression of the spring 23, and the spring load of the spring 23.

The grinding wheel shaft portion 14 includes a pulley 17 and a pulley 19
The motor 21 is driven by the motor 21 through the belt 18 and is forcedly rotated about the center 14b of the grindstone shaft, and at the same time, the base 10 and the hard grindstone 9 fixed to the spline shaft 11 constituting the grindstone shaft portion 14. Is also rotated.

The number of rotations of the motor 21 is 0 to 3000
Rotation control can be performed at about rotation / minute, and a constant rotation speed is maintained during chamfering. The rotation speed can be further increased by changing the rotation ratio of the pulley 17 and the pulley 19, and the rotation speed can be continuously changed by the control device.

The application of the hard grindstone 9 to the edge of the lens 2 may be performed before or after the hard grindstone 2 rotates.

The edge of the lens 2 rotating about the central axis 1a of the lens holder 1 comes into contact with the hard grindstone 9 rotating about the center 14b of the grinding wheel shaft, so that the edge of the lens 2 has a set processing contact angle. chamfered to θ. That is, by setting an arbitrary angle θ by the θ table 31 as the grinding wheel angle adjusting means, the grinding wheel shaft portion 14 is inclined to the angle θ, and the processing contact angle of the hard grinding wheel 9 is determined to the angle θ. 2 are obtained. The processing surface of the hard grindstone 9 can be used not only on the end surface (flat portion) but also on the side surface (outer peripheral surface).

When the chamfering of the lens 2 is completed, the motor 36 drives the motor 39 via the guide 37 and the ball screw 38 to move away from the lens 2 in parallel with the X axis. Escaped from the chamfered position.

According to the present embodiment, the pressure adjusting member 16
Thereby, the processing contact pressure of the hard grindstone 9 with respect to the lens 2 of the spring 23 as the pressing member can be adjusted and kept constant, and the chamfer amount can be adjusted not only by the processing time but also by adjusting the processing contact pressure. The occurrence of pitching in the chamfered portion can be suppressed, and a very small amount of chamfering, for example, 0.
Processing can be performed with uniform accuracy by chamfering processing of 1 mm or less.

Further, X of the hard grindstone 9 is moved by the grindstone moving means.
By adjusting the amount of movement in the axial direction and the Z-axis direction, the position where the lens 2 abuts on the end surface (flat portion) of the hard grindstone 9 may not always be constant, and the end surface (flat portion) of the hard grindstone 9 may not be constant. Since the processing contact position can be set from the outermost circumference to the innermost circumference, that is, the entire end surface (flat portion) of the hard grindstone 9, there is no need to replace the hard grindstone 9 depending on the outer diameter of the lens 2, and the setup time is reduced. can do. further,
Since the processing contact position can be set on the entire surface of the end face (flat portion), the durability of the hard grindstone 9 is improved.

Further, since the processing contact angle can be set, chamfering can be performed at an arbitrary angle corresponding to the radius of curvature of the end surface (polished surface) of the lens 2. Further, since no elastic deformation occurs on the end surface (flat portion) of the hard grindstone 9 in contact with the lens 2, the lens 2 is pushed into the processed surface of the hard grindstone 9 and the end surface (flat surface) of the hard grindstone 9 is polished on the polished surface of the lens 2. Since the contact of the lens 2 can be avoided, it is possible to prevent the polished surface of the lens 2 from being scratched.

(Embodiment 2) Embodiment 2 of the present invention will be described with reference to FIG. FIG. 3 is a cross-sectional view showing the lens holding means, the grindstone holding means, the grindstone rotating means, and the pressure adjusting means of the lens chamfering apparatus of the present embodiment, and shows a state where the processing contact angle between the lens and the hard grindstone is 45 degrees. .

The lens chamfering apparatus according to the present embodiment has basically the same configuration as that of the first embodiment, and has a different pressure adjusting means.

Ball Spline Holding Shaft 1 of Grinding Stone Shaft 14
The rotating member 2 is provided at the upper end of the cavity 14d provided in the rotating member 4a.
The connection member 30 is inserted into the rotation member 29 from outside the ball spline holding shaft 14a. The connection member 30 is fixed to the housing 12 via a rotation preventing member (not shown).
4 is rotatable with respect to the connection member 30.

A cylinder 24 is fixed to the connection member 30. The cylinder rod 24a of the cylinder 24 is disposed on the center 14b of the grinding wheel shaft, and is introduced into the cavity 14d of the ball spline holding shaft 14a through a hole 30a provided in the center of the connecting member 30. The tip of the cylinder rod 24a is in contact with the upper end of the spline shaft 11, and the spline shaft 11 is rotatable with respect to the cylinder rod 24a.

A regulator 25 as a pressure adjusting means is connected to the cylinder 24, and the cylinder rod 24a of the cylinder 24 is movable on the grinding wheel shaft center 14b by the air pressure controlled by the regulator 25.

In the lens chamfering method using the lens chamfering device having the above-described configuration, the air pressure adjusted by the regulator 25 is applied to the cylinder 24 to act on the cylinder 24. And the cylinder rod 2 of the cylinder 24
4a, a load is applied to the spline shaft 11 to make the processing contact pressure between the hard grindstone 9 and the lens 2, and the lens 2 is chamfered. That is, the movement of the cylinder 24 is controlled by the regulator 25 connected to the cylinder 24 to control the air pressure.
It is the same as Embodiment 1 except that the working contact pressure is adjusted.

In this embodiment, when the motor 21 is driven in the same manner as in the first embodiment, the pulley 19 and the pulley 1
The rotation is applied to the grinding wheel shaft portion 14 via the belt 7 and 7, and at the same time, the connection member 30 is also rotated via the rotating member 29. However, since the connecting member 30 inserted into the rotating member 29 is fixed to the housing 12 via a rotation preventing member (not shown), the connecting member 30 does not rotate even if the connecting member 30 is rotated. Rotating member 29
, Only the grinding wheel shaft 14 rotates. The grinding wheel shaft 14 (ball spline holding shaft 14a) and the connecting member 30
Is not limited to the rotating member 29 as long as it does not rotate the connecting member 30 and also allows the grindstone shaft portion 14 to rotate. For example, a sliding member may be used.

If the regulator 25 is replaced with an electropneumatic regulator, the air pressure can be adjusted by electrical control. For example, when the grinding wheel is applied, minute pressure is applied, and when processing proceeds, the contact pressure is continuously increased when stable. Can be increased.

According to the present embodiment, the regulator 25
The range of adjustment of the load applied to the spline shaft 11 by the cylinder 24 is expanded and widened by the air pressure adjustment described above. Since it is possible to set the processing contact pressure suitable for various lenses 2 only by adjusting the air pressure, the load can be easily set.

Also, the cylinder 24
Within this stroke range, a constant pressure can be maintained. Further, by realizing the micromachining contact pressure, sudden pitching at the start of machining can be prevented. Other effects are the same as those of the first embodiment.

(Embodiment 3) Embodiment 3 of the present invention will be described with reference to FIG. FIG. 4 is a sectional view showing the lens holding means, the grindstone holding means, the grindstone rotating means, and the pressure adjusting means of the lens chamfering apparatus according to the present embodiment, and shows a state where the processing contact angle between the lens and the hard grindstone is 45 degrees. .

The lens chamfering device of the present embodiment has basically the same configuration as that of the first embodiment, but differs in the pressure adjusting means.

That is, in the lens chamfering apparatus of the present embodiment, instead of the load adjusting member 16, the spring 23, and the top 22 shown in the configuration of the first embodiment, a load adjusting member 26 It is inserted coaxially with the shaft center 14 b and fixed to the spline shaft 11. The load adjusting member 26 is detachable from the spline shaft 11, can be replaced, and its fixed position can be set freely.

A cavity 14d (see FIG. 1) is not formed in the ball spline holding shaft 14a, a spline shaft passage 14c is opened in the upper end surface of the ball spline holding shaft 14a, and the load adjusting member 26 is connected to the ball spline holding shaft 14a. The load adjusting member 26 can also be locked to the upper end surface of the holding shaft 14a, and also serves as the top 22 which is the spline shaft drop prevention member of the first embodiment. Other configurations are the same as those of the first embodiment.

In the lens chamfering method using the lens chamfering apparatus having the above-described structure, the load of the load adjusting member 26 is applied to the platform 10 and the hard grindstone 9 via the spline shaft 11.
Is transmitted to the hard grinding wheel 9 and the processing contact pressure between the lens 2 and the chamfering of the lens 2.

Further, by adjusting the position on the spline shaft 11, the stroke of the spline shaft 11 along the grinding wheel shaft center 14b can be freely set. Further, by replacing the load adjusting member 26 with a member having an arbitrary load, the processing contact pressure can be adjusted. Otherwise, the configuration is the same as that of the first embodiment.

According to the present embodiment, the working contact pressure can be adjusted only by replacing the load adjusting member 26, and the load adjusting member 26 has a function of preventing the spline shaft 11 from dropping, thereby simplifying parts. Thus, the setup time can be reduced. Further, since the load adjusting member 26 is not replaced during the chamfering, pitching can be reduced by maintaining a constant pressure. Other effects are the same as those of the first embodiment.

(Embodiment 4) Embodiment 4 of the present invention will be described with reference to FIG. FIG. 5 is a sectional view showing the lens holding means, the grindstone holding means, the grindstone rotating means and the pressure adjusting means of the lens chamfering apparatus according to the present embodiment, and shows a state where the processing contact angle between the lens and the hard grindstone is 45 degrees. .

The lens chamfering apparatus of the present embodiment has basically the same configuration as the first and second embodiments. The cylinder 24 and the regulator 25 of the pressure adjusting means shown in the second embodiment have a voice Coil motor 27 and amplifier 2
8 has been replaced.

The voice coil motor 27 attached to the connecting member 30 is provided with a rod 27a disposed on the center 14b of the grinding wheel shaft, and the rod 27a is inserted into the cavity 14d of the ball spline holding shaft 14a. The tip is in contact with the upper end surface of the spline shaft 11. The voice coil motor 27 and the amplifier 28 are connected, and the voice coil motor 27 is driven by the current from the amplifier 28, and the driving force is transmitted to the spline shaft 11 via the rod 27a. Other configurations are the same as those of the first and second embodiments.

In the lens chamfering method using the lens chamfering apparatus having the above-described structure, the current controlled by the amplifier 28 connected to the voice coil motor 27 acts on the voice coil motor 27 and is transmitted to the spline shaft 11 via the rod 27a. A load is applied, the hard grinding stone 9 and the lens 2
Processing contact pressure.

The movement of the voice coil motor 27 is controlled by an amplifier 28 connected to the voice coil motor 27 to control the current value, and the working contact pressure is adjusted.
Is used to chamfer the lens 2. Other than that is the same as the first and second embodiments.

According to the present embodiment, the processing contact pressure of the hard grindstone 9 on the lens 2 can be kept constant by the voice coil motor 27, the processing contact pressure can be adjusted to a small amount by the amplifier 28, and the amount of chamfering can be adjusted by the processing. Since the processing can be performed not only by the time but also by the processing contact pressure, the processing time can be reduced. Other effects are the same as those of the first embodiment.

The technical idea having the following configuration is derived from the above-described specific embodiment. (Supplementary Note) (1) In a lens chamfering method for chamfering an end surface of a lens, a step of holding the lens, a step of rotating the lens, a step of applying a grinding fluid to a hard grindstone, and a step of applying the hard grindstone A step of setting a processing contact angle with respect to the lens, a step of moving the hard grindstone to the ridge of the lens end face and applying the same at a constant contact pressure, a step of rotating the hard grindstone, and A step of releasing a grindstone from the lens.

According to the lens chamfering method (1),
By reducing the contact pressure of the hard grindstone to the lens and applying the hard grindstone to the edge ridge of the lens at a constant contact pressure, regardless of the lens material and shape, the occurrence of pitching in the lens chamfer is reduced. In addition to preventing chamfering, since there is no elastic deformation of the hard grindstone when performing chamfering in contact with the lens, a uniform and extremely small amount of chamfering can be performed without scratching other than the chamfered part, particularly, the lens polishing surface. Further, since the processing contact angle of the hard grindstone with respect to the lens can be arbitrarily set by the grindstone angle adjusting means, chamfering can be performed at an arbitrary angle in accordance with the radius of curvature of the lens polishing surface.

[0074]

As described above, according to the first aspect of the present invention,
According to the lens chamfering device according to the present invention, the contact pressure on the lens of the hard grindstone is reduced, and the processing contact pressure can be adjusted by the pressure adjusting means, so that the processing contact pressure is constant regardless of the lens material and shape. can do. By keeping the contact pressure constant, it is possible to prevent the occurrence of pitching in the lens chamfered part, and since there is no elastic deformation of the hard grindstone when contacting the lens and chamfering, it is especially suitable for the lens polishing surface except for the chamfered part. A uniform and extremely small amount of chamfering can be performed without scratching.

Further, since the processing contact position of the hard grinding wheel with respect to the lens can be freely set by the grinding wheel moving means,
It is possible to use the entire end surface of the hard grindstone in contact with the lens, and it is possible to extend the processing life of the hard grindstone. Further, the replacement of the grindstone is easy, and the setup time can be reduced. Since the processing contact angle of the hard grindstone with respect to the lens can be arbitrarily set by the grindstone angle adjusting means, chamfering can be performed at an arbitrary angle according to the radius of curvature of the lens polishing surface.

According to the lens chamfering method according to the second aspect of the present invention, the contact pressure of the hard whetstone on the lens is reduced,
Irrespective of the material and shape of the lens, a hard whetstone is applied to the edge of the lens at a constant contact pressure to prevent the occurrence of pitching in the lens chamfer, and the lens is chamfered by contact with the lens. At this time, since there is no elastic deformation of the hard grindstone, it is possible to perform a uniform and extremely small amount of chamfering without scratching the surface other than the chamfered part, particularly the lens polishing surface.

[Brief description of the drawings]

FIG. 1 shows Embodiment 1 of the present invention, in which (A) is a perspective view of a lens chamfering device, and (B) is a cross-sectional view of a grinding wheel contact portion.

FIG. 2 is a sectional view showing a main part of the first embodiment of the present invention.

FIG. 3 is a sectional view showing a main part of a second embodiment of the present invention.

FIG. 4 is a sectional view showing a main part of a third embodiment of the present invention.

FIG. 5 is a sectional view showing a main part of a fourth embodiment of the present invention.

FIG. 6 is a perspective view showing a conventional technique.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 lens holder 2 lens 3 chuck 4 stage 8, 21, 35, 39 motor 9 hard grindstone 10 pedestal 11 spline shaft 12 housing 14 grindstone shaft portion 14a ball spline holding shaft 15 ball spline 16 pressure adjusting member 23 spring 24 Cylinder 25 Regulator 26 Load adjusting member 27 Voice coil motor 28 Amplifier 31 θ stage 34, 38 Ball screw 33, 37 Guide 40 Nozzle

Claims (2)

[Claims] 1. A lens chamfering apparatus for chamfering an end surface of a lens, comprising: lens holding means for holding the lens; workpiece rotating means for rotating the lens or the lens holding means; and chamfering the lens. Disk-type rotationally symmetric hard grindstone, grinding fluid supply means for supplying a grinding fluid to the hard grindstone, grindstone holding means for holding the hard grindstone, forcibly rotating the hard grindstone and the grindstone holding means Whetstone rotating means, whetstone moving means for moving the hard whetstone to an arbitrary position, pressure adjusting means for adjusting a contact pressure during processing, and whetstone angle adjusting means for adjusting a contact angle between the lens and the hard whetstone And a lens chamfering device. 2. A lens chamfering method for chamfering an end surface of a lens, comprising: holding the lens; rotating the lens; applying a grinding fluid to a hard grindstone; A lens comprising: a step of moving to a ridge of a lens end face to apply the contact pressure at a constant value; a step of rotating the hard grindstone; and a step of releasing the hard grindstone from the lens after chamfering. Chamfer method.