JP2591851B2 - Lens holding device and holding method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens holding device and a lens holding method in a lens processing machine that simultaneously performs lens spherical surface creation and centering.

[Conventional technology]

In general, in order to process a lens with high precision, it is important to accurately and accurately mount and hold a lens to be processed on the processing machine.

The literature on the conventional lens holding device is
59-17354. FIG. 6 illustrates the technique disclosed in this publication.

FIG. 6 is a longitudinal section of the lens holding chuck shown in FIG. 1 described in the above publication.

A suction cup 6 which is provided coaxially inside the collet chuck 2 and sucks the polished surface of the lens 11 to be processed; and the suction cup 6 is drawn in the axial direction of the lens holding shaft 1 so that the polished surface of the lens 11 to be processed is Means for holding the collet chuck 2 in contact with the lens holding reference surface 12, and the lens 11 to be processed held by suction on the suction cup 6 and held in contact with the lens holding reference surface 12. This is a lens holding chuck that holds the position of the lens 11 to be processed by tightening the collet chuck 2 to such an extent that the collet chuck 2 comes into contact with the outer peripheral surface without play.

[Problems to be solved by the invention]

However, in the conventional lens holding chuck disclosed in the above publication, the lens holding reference surface 12 for positioning in the axial direction of the lens 11 to be processed is provided at the tip of the collet chuck 2, so that the lens 11 to be processed is fixed to the collet chuck 2. When the chucking is performed, the lens holding reference surface 12 moves at the same time as the collet chuck 2 closes, so that the lens 11 to be processed is inclined when chucking. In addition, one surface of the lens 11 to be processed is sucked by the suction cup 6, the suction shaft is pulled in, and the lens 11 to be processed is moved to the lens holding reference surface 12.
In a state where the collet chuck 2 is in contact with the workpiece shaft, the collet chuck 2 is closed and tightened and mounted while the collet chuck 2 is centering the workpiece lens 11 with respect to the work axis. I will. For this reason, there is a disadvantage that the chuck is performed while being tilted.

The present invention has been made in view of the above-described drawbacks, and has as its object to provide a high-precision lens holding device and a lens holding method capable of holding a lens to be processed without causing the lens to tilt. It is.

[Means for solving the problem]

 The concept of the present invention will be described with reference to the drawings.

FIG. 1 is a front view showing the concept of the lens holding device of the present invention, and showing a part of the concept in a cross section.

Reference numeral 2 shown in the figure denotes a cylindrical chuck main body, the base end of which is mounted on a work shaft of a lens processing machine. A communication hole 7 for absorbing the lens 1 to be processed is formed in the axial center of the chuck body 2.

Further, a chuck composed of a plurality of claws 3 for gripping the outer periphery of the lens 1 to be processed is disposed on the distal end surface of the chuck body 2 along the axial direction, and is mounted so as to be openable and closable in a radial direction (radial direction). .

Further, a base end portion of a cylindrical lens abutting body 4 for positioning the lens 1 to be processed in the axial direction is mounted in an inner diameter surrounded by the plurality of claws 3 in the chuck body 2. ing. An annular contact surface that contacts the optical axis surface of the lens 1 to be processed is formed at the tip (the lower end shown in the figure) of the lens contact body 4.

In the lens abutting member 4, a cylindrical suction tube 6 provided with a lens suction pad 5 at the tip thereof is arranged so as to be slidable in the axial direction in order to suck and hold the surface of the lens 1 to be processed. Has been established. Further, an elastic member (spring) 8 is provided on the inner periphery of the upper end of the suction tube 6 of the lens suction pad 5 as shown in FIG.
When the lens 1 to be processed is not adsorbed,
The suction tube 6 is configured to be pushed downward.

As described above, in the lens holding device of the present invention configured as described above, the contact surface for positioning the lens 1 to be processed in the axial direction is provided on the lens contact member 4 that operates independently (separately) from the claw 3. It is a point.

[Action]

The operation of the lens holding device having the above configuration will be described below.

First, when suction is performed through the communication hole 7 by driving an air device (not shown), one surface of the lens 1 to be processed is sucked on the suction surface of the suction pad 5. When the processing lens 1 is sucked, the suction cylinder 6 is drawn inward by the suction force, and one surface of the processing lens 1 comes into contact with the front end surface of the lens contact body 4. Subsequently, the claw 3 is moved inward (closed direction) to come into contact with the outer peripheral surface of the lens 1 to be processed, and to perform centering so that the center axis of the lens 1 to be processed coincides with the work axis. In this case, the lens 1 to be processed is shifted to the center position by the closing operation of the claw 3, and as a result, a gap is generated between the lens 1 to be processed and the contact surface of the lens contact body 4.

Next, after once releasing (instantaneous) the suction by the suction means, the suction pad is operated again to correct the posture of the suction pad. Subsequently, the claws 3 are tightened and opened. As a result, the lens to be processed 1 is released from the regulation by the claw 3, and the lens to be processed 1 is applied without any gap with the above-mentioned contact surface, and the lens to be processed 1 is accurately tightened and held by closing (closing) the claw 3 again.

In addition, by alternately repeating the above-mentioned suction releasing operation, the suction operation again, and the opening / closing operation of the claw 3, one-phase high-precision centering can be performed, and the lens 1 to be processed is accurately held.

〔Example〕

Embodiments of a lens holding device and a holding method according to the present invention will be described with reference to the drawings.

In the drawings of the embodiments, the same reference numerals denote the same parts and the same components, and a description thereof will be made in the first drawing and will be omitted in the subsequent drawings.

(First Embodiment) FIG. 2 is a front view showing a part of a lens holding device according to a first embodiment of the present invention in a cross section.

3 (a), (b), (c), (d), and (e) are cross-sectional views of essential parts showing a lens holding method (procedure) in the lens holding device of FIG.

A central portion in the axial direction of the chuck main body 2 in which a tapered portion at the base end thereof is inserted and mounted in the distal end portion (lower end portion shown in the drawing) of the work shaft 12 is for sucking one surface of the lens 1 to be processed. A communication hole 7 is formed.

On the outer peripheral surface of the chuck main body 2, a connecting cylinder 11 having a large diameter at both outer peripheral ends is rotatably mounted via bearings 15 and 15 '. Between the bearings 15 and 15 ', there are collars 16 on the inner and outer diameter sides of the bearing, respectively.
And 16 'are interposed. A ring-shaped upper plate 13 in which a gear ring 14 having a gear formed on the outer peripheral surface is fitted is loosely attached by a pin 19 to an upper end portion, that is, a base end portion of the connection cylinder 11. That is, the insertion hole of the pin 19 drilled at a desired position of the gear ring 14 is formed by drilling the pin 19 with a diameter larger than the diameter, and the gear ring 14 can be slightly rotated in the horizontal direction as indicated by the arrow. It is configured and installed.

A large diameter portion at the lower end portion (tip portion) of the connection cylinder 11 is integrally attached by a pin 17 on a side wall surface of the scroll 10. A scroll chuck housing 9 is disposed on the lower end surface (tip surface) of the chuck body 2 and on the lower end side wall surface of the scroll 10. On the lower end surface of the center position of the chuck body 2, a lens contact body 4 having a circular contact surface for positioning in the axial direction of the lens to be processed 1 provided on the lower end (front end) surface is coaxial with the work axis 12. It is fixedly attached to.

In addition, a suction pad 5 for sucking the lens 1 to be processed is provided at a lower end portion of the lens abutting member 4 which is circular in the inner diameter direction (center direction) as shown in the drawing. A circular suction cylinder 6 is provided at the base end of the suction pad 5 via an elastic member (spring) 8 with respect to the lower end surface of the chuck body 2 and with respect to the cylindrical lens contact body 4. It is configured and supported to be inscribed.

On the lower end surface of the scroll 10, a plurality of claws 3 having an L-shaped shape for holding the lens 1 to be processed are uniformly mounted. The inner cylindrical surface of the claw 3 whose tip is formed to have an inner diameter smaller than the outer diameter of the lens 1 to be processed is divided into three parts, a part of which is formed as an inner diameter surface and is formed as a tapered surface having an outer diameter. The side surface of the claw 3 is guided by the guide portion of the scroll chuck housing 9, and the scroll screw portion on the upper surface is configured to mesh with the screw portion on the lower surface of the scroll 10. That is, when the work shaft 12 is fixed and the gear 14 is rotated, the scroll 10 is rotated, and the claw 3 for gripping the outer diameter of the lens 1 to be processed is opened and closed in the radial direction (radial direction). ing.

The gear provided in parallel with the gear 14 is a torque transmission gear 18 which is interlocked with the drive source.
The gear 14 is configured to rotate by 18.

The operation sequence (step) of the lens holding device having the above configuration will be described with reference to FIG.

First, although not shown, by driving an air suction device, the surface of the suction pad 5 is suctioned through the communication hole 7,
One surface of the lens 1 to be processed is suction-adsorbed. Then the suction tube 6
Is drawn inward by the suction force, and one side of the lens 1 to be processed comes into contact with the lens contact body 4 as shown in FIG. Subsequently, the nail 3 is operated in the closing direction, and the lens 1 to be processed is
Centering is performed so that the center axis of the lens 1 to be processed coincides with the work axis while tightening the outer periphery of the lens. In this case, the lens 1 to be processed is shifted to the center position by the claw 3, and as a result, as shown in FIG. Occurs.

Further, in the above state, once the suction is released and the suction is performed again, as a result, as shown in FIG. 3 (c), the posture of the suction pad 5 which has collapsed as described above is corrected. Subsequently, the opening / closing claw 3 is opened. As a result, the processing lens 1 is released from the regulation by the claw 3, and the opposing surface and the processing lens 1 are removed.
The gap created between them disappears, and as shown in FIG. Subsequently, the nail 3 is tightened again and the third operation is performed.
The lens 1 to be processed is clamped and held as shown in FIG.

In the above-described holding method, the centering accuracy can be increased and held by repeating the release and operation of the suction pad 5, the re-suction operation, and the opening / closing operation of the claw 3 as necessary for accuracy.

In this embodiment, the scroll chuck is applied. However, if the claw and the lens contact body are configured independently, the same effect as that of the embodiment can be obtained by applying the collet chuck.

(Second Embodiment) FIG. 4 is a sectional view showing a second embodiment relating to the lens holding device of the present invention, and showing a main part from the front thereof.

The difference between the present embodiment and the first embodiment is that the shapes of the claws 3 for clamping and holding the lens 1 to be processed are different.

That is, a tapered portion 3 ′ having a larger diameter (larger) toward the distal end is formed at a portion of the inner wall of each claw 3 that grips the lens 1 to be processed. It should be noted that, in detail, the first
In the embodiment, instead of the shape of the three claws 3, a large taper portion 3 ′ is formed on the inner periphery of each of the claws 3 toward the tip, and each of the claws 3 is operated in the radial direction with respect to the center. Is configured. The arrangement of the lens contact member 4 disposed immediately inside the claw 3 and the lens suction cylinder 6 and the lens suction pad 5 are the same as those in the first embodiment.

 Next, the operation of the above configuration will be described.

First, when the claw 3 clamps the outer periphery of the lens 1 to be processed, the tapered portion 3 ′ at the inner peripheral end of the claw 3 is deformed and operated along the outer periphery of the lens 1 to be processed. At this time, since the claw 3 has a shape that opens downward to the tapered end portion 3 ′, even if the claw 3 is deformed so as to be bent outward, the processed lens 1 is separated from the lens contact body 4 in the first embodiment. Directional forces do not work.

Therefore, the lens to be processed can be held with high precision without being generated between the lens to be processed 1 in the first embodiment and the abutting surface of the lens contact body 4.

In the first embodiment, the tip of the claw 3 gripping the outer periphery of the lens 1 to be processed is divided into a cylindrical shape having an inner diameter smaller than the outer diameter of the lens 1 to be processed, and a part thereof is defined as an inner surface. At the same time, a tapered surface is provided on the outer diameter surface. However, the present invention is not limited to this, and as shown in this embodiment, a tapered surface which opens below the inner surface of the tip of the claw 3 is provided, and the outer peripheral surface is made straight (cylindrical). You may.

Third Embodiment FIGS. 5 (a) and 5 (b) show a third embodiment of the lens holding device of the present invention, and are cross-sectional views showing main parts from the front thereof.

The difference between the present embodiment and the first embodiment is that the tip of the lens contact body 4 of the lens holding chuck, that is, the contact surface shape is in contact with the R surface of the lens 1 to be processed. The point is that the shape of the part is made into an R shape.

As shown in FIG. 5 (a), when the concave surface of the lens to be processed 1 is brought into contact, the lower end surface (imping surface) of the lens abutting body 4 has a size of R or less of the R surface of the lens 1 to be processed. An R-shaped ridge on the outer diameter side is formed.

Further, as shown in FIG. 5 (b), when the R of the contact surface of the lens 1 to be processed is a convex surface, a ridge on the inner diameter side of the lower end surface (imping surface) of the lens contact body 4 is formed. .

As described above, by forming the abutting surface (impinging surface) of the lens abutment 4 on the lens 1 to be processed, the lens 1 to be processed 1 is formed.
In the process of centering when chucking the lens to the chuck body 2, the movement of the lens to be processed 1 is performed smoothly, and the lens to be processed 1 can be held with high precision without tilting.

〔The invention's effect〕

According to the lens holding device and the holding method of the present invention having the above-described configuration, it is possible to hold the lens to be processed with a high degree of precision and extremely easily because the lens to be processed can be shifted without any axis, as well as the inclination at the time of chucking. This makes it possible to produce a high-precision lens with high quality and high productivity.

[Brief description of the drawings]

FIG. 1 shows the concept relating to the lens holding device of the present invention,
The front view which shows a part by cross section. FIG. 2 is a front view showing a part of the lens holding device according to the first embodiment of the present invention in cross section. 3 (a), (b), (c), (d), and (e) are cross-sectional views of main parts showing a lens holding method (procedure) in the lens holding device of FIG. FIG. 4 is a sectional view showing a second embodiment relating to the lens holding device of the present invention, showing a main part from the front thereof. 5 (a) and 5 (b) show a third embodiment of the lens holding device according to the present invention, and are cross-sectional views showing main parts from the front thereof. FIG. 6 is a sectional view showing a conventional lens holding chuck. DESCRIPTION OF SYMBOLS 1 ... Lens to be processed, 2 ... Chuck body 3 ... Claw 4 ... Lens contact body 5 ... Lens suction pad 6 ... Suction cylinder 7 ... Communication hole 8 ... Elastic member (spring) 9 ... Scroll chuck housing 10 Scroll 11 Connection cylinder 12 Work shaft 13 Upper plate 14 Gear ring 15, 15 'Bearing 16, 16' Collar 17, 19, 20 Pin 18 …… Torque transmission gear

Claims (2)

(57) [Claims] 1. A lens holding apparatus for holding and processing an outer peripheral surface of a lens to be processed which is attracted and for positioning the lens to be processed in a radial direction while holding an outer peripheral surface of the lens to be processed. A chuck composed of a plurality of claws movable in the radial direction of the lens to be processed, the chuck being disposed concentrically with the chuck disposed inside the plurality of claws, and contacting the lens to be processed with the tip at the tip. A cylindrical abutting member for positioning the lens to be processed in the axial direction, and a suction cylinder disposed inside the plurality of claws and movable in the axial direction of the lens to be processed and having a suction pad at a tip thereof And a gas communication hole provided so as to communicate between the suction cylinder and the suction pad. 2. A mounting step of sucking a lens to be processed and bringing its surface into contact with a lens contact body, a centering step of closing a nail to center the lens to be processed, and mounting by the mounting step. A means for once releasing the means, suctioning it again to correct the inclination of the lens to be processed, etc., and once opening and closing the claw closing means in the above-mentioned centering step, and centering the lens to be processed again. A method of holding a lens, the method comprising: