JP2001246540A - Grinding and polishing work device for lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent vibration of a lens at working from generating by eliminating a torque transmission mechanism from a grinding and polishing work device of the lens. SOLUTION: A grinding and polishing work device carries out grinding and polishing work of a lens 1 by rotating the lens 1 as well as rotating and oscillating a grinding wheel 6 while supplying working liquid by making the lens 1 contact with the grinding wheel 6. A torque transmission mechanism of a rotational driving means 23 is eliminated by furnishing an upper shaft 11 free to move in the vertical direction, an oscillating mechanism 10 installed on the upper shaft 11 free to oscillate, a work holding body 2 installed on the oscillating mechanism 10 and to hold the lens 1 free to rotate and a rotational driving means 23 fixed on the oscillating mechanism 10, directly connected to the work holding body 2 and to rotate the work holding body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lens grinding / polishing apparatus for grinding / polishing a lens with a grindstone.

FIG. 14 shows a conventional lens grinding / polishing apparatus described in JP-A-7-1311. The work holder 200 for holding the lens 1 has a shaft 210
The upper end is rotatably held by the second swing member 190 via the bearing 220. An inverted cup-shaped holding plate 230 is integrally formed at the lower end of the shaft portion 210. The holding plate 230 holds the lens 1 in the concave portion,
An O-ring 240 that is in close contact with the back surface of the lens 1 is disposed in the concave portion, and one end of a hollow suction hole 250 formed in the shaft portion 210 is opened at the center of the concave portion.

[0003] The shaft 210 of the work holder 200 is provided on the upper side of an upper shaft 11 movably provided in the vertical direction on the processing apparatus main body side.
Connected to 0. That is, the shaft portion 210 is
It is connected via a joint 260 to a pulley 120 rotatably provided at zero. On the side of the upper shaft 110,
A motor 150 on the processing apparatus main body side is arranged, and a belt 130 is stretched over a pulley 140 attached to a rotation shaft of the motor 150 and the pulley 120 described above. Therefore, when the motor 150 rotates,
The rotational force is transmitted through the pulley 140, the belt 130, and the pulley 120, and the work holder 200 rotates.

A stay member 160 is provided below the upper shaft 110.
Is fixed so as to hang down.
The first swing member 170 is swingably attached to the first swing member 170. The first swing member 160 is formed so as to have a U-shape in a horizontal plane, and the above-described second swing member 190 is swingably attached to both left and right ends thereof via pins 270. I have. The second swing member 190 is formed to have a U-shape in a vertical plane.

[0005] A grindstone 6 for grinding and polishing the lens 1 is disposed below the work holder 200. This whetstone 6
Are configured to rotate and swing via a motor and a swing mechanism (not shown).

In the processing apparatus having this structure, first, the lens 1
Of the work holding member 200 is sucked into the concave portion of the holding plate 230 of the work holding member 200 through a suction hole 250 by a pneumatic device (not shown). Hold. Next, the surface of the lens 1 is brought into contact with the grindstone 6, and the lens 1
Release the suction.

[0007] A grinding liquid is supplied between the lens 1 and the grindstone 6 and, at the same time, the grindstone 6 is given a rotating motion and a swinging motion to perform the grinding and polishing of the lens 1. At this time, the lens 1 rotates at substantially the same rotation speed as the grindstone 6 as the grindstone 6 rotates. Then, the motor 150 is driven to intermittently rotate the workpiece holder 200 in the same direction as the grindstone 6 at a rotational speed sufficiently smaller than that of the grindstone 6. Thus, the surface of the lens 1 is ground and polished.

[0008]

SUMMARY OF THE INVENTION The above-mentioned conventional grinding and grinding methods
In the polishing apparatus, the driving force of the motor 150 is
The power is transmitted to the work holder 2 by a transmission mechanism including a belt 0, 120, and a belt 130. However, since the transmission mechanism has a large number of parts, vibration is likely to occur in the process of transmitting the driving force, and the vibration is transmitted to the work holder 200 and the lens 1. Also, the motor 150 and the pulley 140
Are disposed on the processing apparatus main body side, so that vibrations generated in the processing apparatus main body are easily transmitted to the work holder 200 and the lens 1. Then, these vibrations cause the lens 1
Since the surface roughness of the lens 1 increases and the spherical shape of the lens 1 deteriorates, there is a problem that processing cannot be performed with high accuracy.

The pulleys 140 and 120 and the belt 13
There is also a problem that the vicinity of the upper shaft 110 becomes large because the transmission mechanism made of zero is bulky. Further, the work holder 20
In the case where 0 is a structure that swings so as to cancel the resistance generated between the surface of the lens 1 and the grindstone 6, the transmission mechanism regulates the degree of freedom of the swing, so that the work is held by the resistance. There is also a problem that the body 200 may exhibit abnormal behavior.

The present invention has been made in view of such problems in the prior art, and prevents the work holder from vibrating unnecessarily, and the vibration generated on the upper shaft side causes the work holder to fail. An object of the present invention is to provide a lens grinding / polishing apparatus that can reduce the size of the vicinity of the upper shaft without being transmitted to the lens and that does not reduce the degree of freedom of swing of the work holder. I do.

[0011]

In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that a lens is brought into contact with a grindstone, and the grindstone is rotated and oscillated while supplying a working liquid, and the lens is rotated. In an apparatus for grinding and polishing a lens, an upper shaft movable in a vertical direction, a swing mechanism swingably attached to the upper shaft, and the lens attached to the swing mechanism, the lens A work holder for rotatably holding the work holder; and a rotation drive unit fixed to the swing mechanism and directly connected to the work holder to rotate the work holder.

According to the present invention, the rotation driving means for rotating the work holding member is directly connected to the work holding member in a state fixed to the swinging mechanism, and the transmission mechanism for transmitting the rotational force includes the rotation driving means and the work holding member. There is no need to intervene between them. For this reason, vibrations generated on the processing apparatus main body side such as the upper shaft or vibrations from the transmission mechanism are not transmitted to the work holder and the lens, and the work holder and the lens do not vibrate unnecessarily. Therefore, the lens can be processed with high precision. Further, there is no need to interpose a transmission mechanism between the upper shaft and the swinging mechanism, so that the swinging of the swinging mechanism is not restricted and the vicinity of the upper shaft can be reduced in size.

According to a second aspect of the present invention, there is provided the first aspect of the present invention, further comprising a restraint means for restraining a tilt due to the swing of the swing mechanism.

According to the present invention, since the restraining means restrains the tilt of the swinging mechanism, the lens supported by the swinging mechanism via the work holder does not come into contact with the grindstone in the tilted state. For this reason, uneven wear and abnormal vibration of the lens and the grindstone can be prevented, and processing can be performed with high precision.

The invention according to claim 3 is the invention according to claim 2, wherein the restraining means is attached to the swinging mechanism and applies a weight or / and a swinging mechanism to load the swinging mechanism in the direction of gravity. The upper shaft is a pulling member that applies a pulling force to pull the upper shaft.

The weight applies a force to the swing mechanism in the direction of gravity,
Since the pulling member applies a pulling force to the swing mechanism and the upper shaft, both of them suppress the inclination of the swing mechanism. In the present invention, since one or both of these are provided, the lens does not come into contact with the grindstone in an inclined state, and uneven wear and abnormal vibration of the lens and the grindstone can be prevented.
It can be processed with high precision.

A fourth aspect of the present invention is the invention according to any one of the first to third aspects, wherein the lens is fixed to a lens holding plate, and the work holding member magnetically attracts the lens holding plate. It is characterized by having a magnetic member.

According to the present invention, since the lens holding plate is magnetically attracted to the work holder by the magnetic member, the work holder can hold the lens. In this magnetic attraction,
The structure is simpler than the pneumatic suction, and the attachment / detachment is easy, so that the operability of attachment / detachment is improved.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to embodiments shown in the drawings. In each of the embodiments, the same elements are denoted by the same reference numerals and correspond to each other. The lens 1 to be processed and the grindstone 6 for processing
Are given the same reference numerals as in the prior art. Note that a concave lens is used as the lens 1.

(Embodiment 1) FIG. 1 is a front view showing a main part of a processing apparatus according to Embodiment 1 of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a perspective view of the main part, and FIG. It is a side view which shows operation | movement at the time. The processing apparatus according to this embodiment has an upper shaft 1
1, a swing mechanism 10 and a work holder 2.

The upper shaft 11 has a pressing mechanism (not shown), and is a processing shaft that can move vertically. As shown in FIG. 2, a screw hole 12 is formed in a side surface of the upper shaft 11, and a stay member 14 is attached to the upper shaft 11 through the screw hole 12. The stay member 14 has a through-hole 14a formed in an upper portion thereof.
Is fixedly attached to the upper shaft 11 by allowing a bolt 13 to pass therethrough and screwing it into the screw hole 12.

The swing mechanism 10 is attached to the stay member 14. The swing mechanism 10 includes a first swing member 15 and a second swing member 15.
It has a swing member 19, and the first swing member 15 is attached to the stay member 14, while the second swing member 19 is attached to the first swing member 15. Here, as shown in FIG. 3, the first swing member 15 is formed in a U-shape along the horizontal direction, and the second swing member 19 is formed in a U-shape along the vertical direction. Therefore, the first swinging member 15 and the second swinging member 19 have a shape in which the bending arm portions 15b, 19b extend from both sides of the linear arm portions 15a, 19a.

As shown in FIG. 2, the first swing member 15 is attached to the stay member 14 by fixing the first support shaft 17 to the center of the linear arm portion 15a of the first swing member 15 in a protruding manner. Then, the first support shaft 17 is penetrated through the stay member 14 through the bearing 16, and the nut 18 is tightened. Thereby, the first swing member 15 can swing around the first support shaft 17 which is the center axis.

As shown in FIG. 1, the second swing member 19 is attached to the first swing member 15 by attaching the second swing member 19 to the distal end of each of the bending arms 15b on both sides of the first swing member 15.
The support shaft 21 is fixed, and the second support shaft 21 is
9 through the bent arm portions 19 b on both sides of the bearing 9 via bearings 20. Thereby, the second swinging member 19 can swing around the second support shaft 21 which is the center axis thereof.

In such an oscillating mechanism 10, the support shafts 17 and 21 are formed such that the respective central axes intersect at the point O, whereby the first oscillating member 15 is moved in the direction indicated by the arrow E.
(See FIG. 1), and the second swing member 19 swings as shown by an arrow F (see FIG. 2).

The work holder 2 is attached to the second swing member 19. As shown in FIG. 1, the workpiece holder 2 has a shaft 2a and a dish holder 2b integrally formed coaxially. The shaft portion 2a is supported by a central portion of the linear arm portion 19a of the second swinging member 19 via a bearing 22, whereby the work holder 2 is rotatably attached to the second swinging member 19. I have.

The plate holder 2b of the work holder 2 is
The lens holding plate 5 is detachably mounted on the plate holding portion 2b.

The lens holding tray 5 has a lens bonding surface 5a to which the back surface of the lens 1 is bonded at a lower portion, and a cylindrical inner insertion hole 5b into which the tray holding portion 2b is inserted in a dense state. are doing. The entire lens holding plate 5 is formed of magnetic stainless steel. On the other hand, a permanent magnet 2c as a magnetic member is fixed to the lower surface of the plate holder 2b of the work holder 2, and the lens holder 5 is attracted to the work holder 2 by the magnetic force of the permanent magnet 2c. Will be retained. As a result, the lens 1 is held by the work holder 2. Such holding by magnetic attraction has a simpler structure than pneumatic attraction and is easy to attach and detach, so that the operability of attachment and detachment is improved.

In addition to the above, a motor 23 is disposed as a rotation driving means for rotating the work holder 2. The motor 23 is attached to the second swing member 19 of the swing mechanism 10. The motor 23 is fixed to the upper part of the center portion of the linear arm portion 19a of the second swing member 19. The output shaft (not shown) is directly connected to the shaft portion 2a of the work holder 2. Therefore, when the motor 23 is driven, the rotational force of the motor 23 is directly transmitted to the work holder 2, and the work holder 2 rotates.

The grindstone 6 is connected to a motor and a swinging mechanism (not shown), whereby the lens 1 is ground and polished while rotating and swinging.

Next, the grinding and polishing of the lens 1 according to this embodiment will be described. First, the work holding body 2 holds the lens holding plate 5 to which the lens 1 is adhered and held by magnetic attraction. Next, the surface of the lens 1 is brought into contact with the grindstone 6 by lowering the upper shaft 11. And the upper shaft 11
The working fluid is supplied between the lens 1 and the grindstone 6 by adjusting the magnitude of the load applied to the surface of the lens 1 by a pressure mechanism (not shown).

The surface of the lens 1 is processed by rotating the lens 1 by the motor 23 via the work holder 2 and the lens holding plate 5 and oscillating while rotating the grindstone 6. In this operation, the first rocking member 15 and the second rocking member 19 are freely rotated around the point O so that the load and vibration transmitted to the lens 1 are dispersed by the contact between the lens 1 and the grindstone 6. Rocks.

In this embodiment, since the motor 23 for rotating the lens 1 is fixed on the second swing member 19 and is directly connected to the work holder 2, the swing mechanism 10 and the upper shaft 11 There is no need for a transmission mechanism for transmitting the rotational force between the two. For this reason, vibrations generated in other parts of the processing apparatus including the upper shaft 11 are not transmitted to the lens 1 and
No vibration is generated from the transmission mechanism. Therefore, these vibrations do not accelerate the wear of the grindstone 6 and do not adversely affect the quality of the lens 1 surface.

Since the transmission mechanism is not interposed between the upper shaft 11 and the swing mechanism 10, the swing of the swing mechanism 10 is not restricted. For this reason, the grindstone 6 is moved to the lens 1 during processing.
The surface can be surely copied, and high-precision processing can be performed. Further, since no transmission mechanism is interposed between the upper shaft 11 and the swing mechanism 10, the vicinity of the upper shaft 11 can be reduced in size, and the entire device can be reduced in size.

(Embodiment 2) FIG. 4 is a perspective view of a main part according to Embodiment 2 of the present invention, and FIGS. 6 and 7 are side views. In this embodiment, a suppressing means is provided in addition to the configuration of the first embodiment, and a weight is used as the suppressing means.

The weight 24 as a restraining means is attached to the second swing member 19 of the swing mechanism 10, and is attached to each lower end of the bent arm portion 19b of the second swing member 19 by bonding, screwing, or the like. Fixed. In addition, the weight 24 is located on the left and right of the second swinging member 19.
It is provided so as to have an equal weight, and is fixed so as not to lose the right and left balance.

By attaching the weight 24 in this manner, the second swinging member 19 is weighted in the direction of gravity.
The position of the center of gravity is lower than the position of the center of gravity of the second seeding member 19 when there is no weight 24. Therefore, during the processing of the lens 1, as shown in FIG.
Is inclined, the gravity acting on the weight 24 causes
The distal ends of both bending arm portions 19b of the second swing member 19 are pulled downward as indicated by the arrow G. Therefore, an attempt is made to return to a state without inclination as shown in FIG.

By this return operation, the lens 1 supported by the second swinging member 19 via the work holder 2 does not come into contact with the grindstone 6 in a state where the lens 1 remains inclined. Uneven wear and abnormal vibration do not occur. Therefore, high-precision processing can be performed.

(Third Embodiment) FIGS. 7 and 8 show a third embodiment. Also in this embodiment, the second embodiment
Similarly to the above, the weight 25 is used as a restraining means, and the weight 25 of this embodiment is attached to the first swing member 15 of the swing mechanism 10. This weight 2
Numeral 5 is fixed to the central portion of the linear arm 15a of the first swinging member 15 by bonding, screwing, or the like, so that it is suspended from the lower surface of the linear arm 15a. By being fixed to the central portion of the linear arm 15a in this manner, the left and right balance of the entire swing mechanism 10 is not lost.

As described above, the weight 25 is connected to the first swinging member 15.
, The swing member 10 as a whole
Weighted in the direction of gravity. Therefore, the first swing member 15
Of the center of gravity of the first swing member 1 when there is no weight 25
9, when the first swinging member 15 is inclined during the processing of the lens 1 as shown in FIG. 9, the first swinging member 15 is moved by an arrow due to the gravity acting on the weight 25. The first swinging member 15 swings in the H direction to return to the horizontal state, that is, the state shown in FIG.

By this return operation, the lens 1 supported by the first swinging member 15 via the work holder 2 and the second swinging member 19 does not come into contact with the grindstone 6 in a state of being inclined. In addition, uneven wear and abnormal vibration of the lens 1 or the grindstone 6 do not occur. Therefore, high-precision processing can be performed.

(Fourth Embodiment) FIGS. 10 and 11 are partially cutaway side views of a fourth embodiment. In this embodiment, an inquiry mechanism is provided as a restraining means. In the inquiry mechanism of this embodiment, an elastic member 26 such as rubber, which can be elastically deformed, is used. Both ends of the elastic member 26 are adhesively fixed to the upper surface of the central portion of the motor 23 fixed to the second swing member 19 and the lower surface of the central portion of the upper shaft 11. Thereby, the elastic member 26 is connected to the swing mechanism 10 to which the motor 23 is attached and the upper shaft 1.
1 is connected.

When the first swing member 15 and the second swing member 19 constituting the swing mechanism 10 are inclined, the elastic member 26 elastically extends as shown in FIG. A pulling force acts in a direction in which the central portion of the upper shaft 11 and the central portion of the upper shaft 11 attract each other. Accordingly, when the first swing member 15 and the second swing member 19 of the swing mechanism 10 are inclined during the processing of the lens 1, the elastic member 26 is in a state where these swing members 15, 19 are not inclined. Acts to return to. Due to this return action, the lens 1 supported by the swing mechanism 10 via the work holder 2 does not come into contact with the grindstone 6 in a state where the lens 1 remains inclined, and uneven wear or abnormal vibration occurs on the lens 1 or the grindstone 6. Will not occur. Therefore, high-precision processing can be performed. It should be noted that the elastic member 26 may be any member that exerts a drawing force by being extended, and a spring or another member can be used.

(Fifth Embodiment) FIGS. 12 and 13 show a fifth embodiment. In this embodiment, a pair of permanent magnets 27 and 28 are used as an attraction mechanism.
One permanent magnet 27 is fixed to the center of the upper surface of a motor 23 mounted on the second swing member 19 in the swing mechanism 10 by bonding, screwing, or the like, and the other permanent magnet 28 is fixed to the upper shaft 11. Is similarly fixed to the lower surface of the central portion of the.

The pair of permanent magnets 27 and 28 are fixed such that opposite magnetic poles are opposed to each other. As a result, a mutually attractive magnetic force acts between the permanent magnets 27 and 28. I have. Thereby, even if the first swing member 15 and the second swing member 19 constituting the swing mechanism 10 are inclined and the permanent magnets 27 and 28 are separated, the magnetic force attracting each other as shown by the arrow L in FIG. Is acting, the swinging members 15 and 19 return to the state where they are not inclined and perform the action. Due to this return action, the lens 1 supported by the swing mechanism 10 via the work holder 2 does not come into contact with the grindstone 6 in a state where the lens 1 remains inclined, and uneven wear or abnormal vibration occurs on the lens 1 or the grindstone 6. Will not occur.
Therefore, high-precision processing can be performed.

As the inquiry mechanism of this embodiment, it is possible to operate similarly without using both permanent magnets, but using one as a permanent magnet and the other as a magnetic material.

The present invention is not limited to the above embodiment, but can be variously modified. For example, as the lens 1 to be processed, not only a concave lens but also a convex lens can be used. Further, although the permanent magnet 2c is used as the magnet of the work holder 2, an electromagnet may be used, whereby the attraction force of the lens holding plate 5 can be adjusted as appropriate. Further, the motor 23 as the rotation driving means has a size that can be mounted on the second swing member 19,
The type and the magnitude of the output are not limited as long as it has a torque sufficient to rotate the lens 1, and a deceleration mechanism may be provided inside. Further, in each embodiment, a structure in which the other embodiments are combined may be adopted. Therefore, the weights 24 and 25 and the permanent magnets 26, 27 and 28 may be combined.

[0048]

According to the first aspect of the present invention, the rotation driving means is directly connected to the work holding member while being fixed to the swinging mechanism. There is no need to intervene with the body, and vibration generated on the processing apparatus main body side such as the upper shaft or vibration from the transmission mechanism is not transmitted to the work holder and the lens. Therefore, the work holder and the lens do not vibrate unnecessarily, and the lens can be processed with high precision.
In addition, the swing of the swing mechanism is not restricted, and the vicinity of the upper shaft can be reduced in size.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, since the restraining means restrains the tilt of the swing mechanism, the lens supported by the swing mechanism remains tilted. As a result, the abrasion of the lens and the grindstone can be prevented, and the lens can be processed with high precision.

According to the invention of claim 3, claims 1 and 2
In addition to the effects of the invention, since one or both of the weight and the inquiring member is provided as a restraining means, the lens does not come into contact with the grindstone in the inclined state, and uneven wear and abnormal vibration of the lens and the grindstone are prevented. Can be prevented and can be processed with high precision.

According to the fourth aspect of the invention, in addition to the effects of the first to third aspects, the lens holding plate is magnetically attracted to the work holder by the magnetic member, so that the structure is simple and the mounting and dismounting is possible. Operability is improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a main part, showing Embodiment 1 of the present invention.

FIG. 2 is a partial side view of a main part according to the first embodiment;

FIG. 3 is a perspective view of a swing mechanism according to the first embodiment.

FIG. 4 is a side view at the time of processing according to the first embodiment.

FIG. 5 is a perspective view illustrating a swing mechanism according to a second embodiment.

FIG. 6 is a partially broken side view of a main part of the second embodiment.

FIG. 7 is a partially broken side view for explaining the operation of the second embodiment.

FIG. 8 is a perspective view illustrating a swing mechanism according to a third embodiment.

FIG. 9 is a perspective view illustrating the operation of the third embodiment.

FIG. 10 is a partially broken side view of a main part according to a fourth embodiment.

FIG. 11 is a partially broken side view for explaining the operation of the fourth embodiment.

FIG. 12 is a partially broken side view of a main part according to the fifth embodiment.

FIG. 13 is a partially broken side view for explaining the operation of the fifth embodiment.

FIG. 14 is a partially cutaway front view of a conventional processing apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 lens 2 work holder 5 lens holder 6 grinding wheel 10 swing mechanism 11 upper shaft 15 first swing member 19 second swing member 23 motor 24 25 weight 26 elastic member 27 28 permanent magnet

Claims (4)

[Claims] 1. An apparatus for bringing a lens into contact with a grindstone, rotating and oscillating the grindstone while supplying a processing liquid, and rotating and rotating the lens to grind and polish the lens. An upper shaft, a swing mechanism that is swingably attached to the upper shaft, a work holder that is attached to the swing mechanism, and that holds the lens rotatably;
A lens driving / grinding / polishing apparatus fixed to the swinging mechanism and directly connected to the work holder to rotate the work holder. 2. The lens grinding / polishing apparatus according to claim 1, further comprising a restraining means for restraining a tilt due to the swing of the swing mechanism. 3. The weight control device according to claim 1, wherein the restraining means is attached to the swinging mechanism and applies a weight to the swinging mechanism in the direction of gravity.
3. The lens grinding / polishing apparatus according to claim 2, wherein the swing mechanism and the upper shaft are a pulling member for exerting a pulling force for pulling the upper shaft. 4. The apparatus according to claim 1, wherein said lens is fixed to a lens holding plate, and said work holding member includes a magnetic member for attracting magnetic force to said lens holding plate. Grinding and polishing equipment for lenses.