KR101593900B1 - Lens processing device - Google Patents

Abstract

In the lens processing apparatus 1, the lens 11 is sucked and supported by the lens holder 12, which is rotatably and swingably supported by the tip of the lens holder shaft 13 via the pivot bearing mechanism 14, The lens 11 and the lens processing tool 31 are moved relative to each other while the lens processing tool 31 is being pressed against the lens surface 11a. The Z-axis moving mechanism 19 and the X-axis moving mechanism 15 control the feeding of the lens holder 12 in the Z-axis and X-axis directions orthogonal to each other to move the lens 11 in the vertical direction including these two axes It is possible to move along an arbitrary trajectory on a plane. the arc-shaped machining surface 31a of the lens machining tool 31 can be turned along the circular locus centered on the? axis 32 by the? Therefore, the lens surface 11a can be processed while maintaining the state in which the lens 11 is pressed horizontally with respect to the arcuate machining surface 31a of the lens processing tool 31. [

Description

[0001] LENS PROCESSING DEVICE [0002]

TECHNICAL FIELD The present invention relates to a lens processing apparatus having high versatility capable of performing polishing, grinding, and the like of a lens surface by various processing methods.

Conventionally, as a method of processing the surface of a lens, there have been known methods of machining a surface of a lens such as an Oscar-type, an inclined-axis-type, a spherical-oscillation-type, And a planetary-oscillation-type method is known. An optimum processing method is selected from among these processing methods in accordance with the shape, materials, and the like of the lens, and the surface of the lens is processed by using a lens processing device (exclusive lens) for processing by the selected processing method. Therefore, in the prior art, since various types of lens processing apparatuses must be individually prepared, there is a problem that cost of equipment or a space for installation is large, resulting in poor economical efficiency.

The applicant of the present invention has proposed in Patent Document 1 (Japanese Patent No. 3981326) that a plate-shaped or cup-shaped lens processing tool can be moved accurately along an arbitrary trajectory without using a cam mechanism , And a lens processing apparatus capable of processing a lens surface by various processing methods. In this lens processing apparatus, on the processing surface of an upwardly facing lens processing tool, an image of an object to be processed, which is horizontally adsorbed and supported on a lens supporting surface (lens supporting surface) that faces downward from a lens holder, The processing surface of the lens processing tool is pressed on the lens from the lower side for processing. Further, by controlling the movement of the lens processing tool in the Z-axis direction (vertical direction), the movement in the X-axis direction (horizontal direction), and the turning around the? -Axis orthogonal to the Z- So that the lens surface can be processed.

Japanese Patent No. 3981326

Here, in the conventional oscar-type, tetragonal-type, and oil-oscillating-type lens processing apparatus used for curving the lens (curved surface processing), when the rotation axis of the lens processing tool and the lens holder axis are inclined at a predetermined angle The lens can not be maintained in a horizontal state. The lens is subjected to rotation in accordance with the rotation of the lens processing tool during processing, and a force that is always going to return to the horizontal state due to the inertial force due to rotation acts on the lens. Therefore, the pressing stress generated between the lens and the lens processing tool is not uniform, and the processing accuracy of the lens processing surface may be lowered.

Further, when the rotation axis of the lens processing tool and the lens holder axis are inclined, when the pressing force against the lens holder shaft is released to release the pressing force of the lens with respect to the lens processing tool at the time of replacing the lens, There is a risk of slipping off from the surface and breaking it.

Further, if the inclination of the lens at the time of completion of processing is not constant, it is difficult to attach and detach the lens by the automatic transporting device, and the lens exchange by hand is inevitable. Therefore, it is not possible to automate the exchange of the lens and to improve the efficiency of the operation.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a lens holder which is supported by a lens holder, which is rotatably and swingably supported via a pivot bearing, at the tip of a lens holder shaft, A lens processing apparatus for processing a lens curved surface by relatively moving a processing tool, wherein the lens curved surface can be processed by various processing methods while keeping the lens always horizontally.

According to an aspect of the present invention,

A lens holder shaft extending in the vertical direction,

The lens holder is attached to the lower end of the lens holder shaft in a coaxial state through a pivot bearing and rotates about the pivot bearing about a lens capable of oscillating and ratting, A lens holder,

A Z-axis moving mechanism (Z-axis moving mechanism) for moving the lens holder axis in the vertical Z-axis direction,

An X-axis moving mechanism (X-axis moving mechanism) for moving the lens holder axis in a horizontal X-axis direction,

A lens processing tool having an arc-shaped machining surface of a convex or concave shape arranged to face upward to process a lens held by the lens holder,

A? -Axis turning mechanism (? -Axis turning mechanism) for swiveling the lens processing tool about a? -Axis extending in a horizontal direction orthogonal to the X-axis,

A lens processing tool rotating mechanism for rotating the lens processing tool about a central axis (central axis) of the lens processing tool passing through a? Axis,

Axis movement mechanism, the X-axis movement mechanism, the Z-axis movement mechanism, and the? -Axis rotation mechanism to move the lens holder in the X-axis direction attached to the lens holder shaft, move in the Z- And a drive control means (movement control means) for executing a plurality of kinds of lens processing modes by controlling the turning of the lens processing tool about the &thetas; axis.

In the lens processing apparatus according to the present invention, in the lens processing mode by the drive control means, the lens processing surface of the lens processing surface of the lens processing hole pivoting about the &thetas; And a lens processing mode for driving and controlling the X-axis moving mechanism, the Z-axis moving mechanism, and the &thetas; -axis turning mechanism so that the lens of the supported object to be processed is maintained in a horizontally pressed state from the image side have.

In the lens processing apparatus of the present invention, the lens to be processed, which is supported by being attracted and supported by the lens holder, is moved in the Z-axis direction and the X-axis direction by the movement of the lens holder in two orthogonal directions (Z- and X- It is possible to move along an arbitrary locus on the vertical plane. Further, on the vertical plane, the arc-shaped machined surface of the lens processing tool can be turned along a circular path around the θ axis. Therefore, it is possible to realize a lens processing mode in which the surface of the lens is processed while keeping the lens pressed horizontally from the upper side with respect to the arc-shaped processing surface of the lens processing tool.

In the lens processing apparatus of the present invention, it is preferable that the lens processing apparatus is provided with a Y-axis moving mechanism (Y-axis moving mechanism) for moving the lens processing tool in the Y-axis direction parallel to the θ-axis.

The lens processing tool is positioned at an arbitrary position in the Y axis direction by the Y axis moving mechanism and the lens holder is reciprocated in the X axis direction by the X axis moving mechanism at this position, The lens surface can be processed by the lens processing mode. Further, the X-axis moving mechanism, the Z-axis moving mechanism, and the &thetas; axis turning mechanism are individually controlled to move and fix the lens holder and the lens processing tool to a predetermined position, Can be processed.

According to the lens processing apparatus of the present invention, the lens processing can be performed by the lens processing mode in which the lens surface is processed while the lens is always held horizontally. In this lens processing mode, the pressing stress of the lens with respect to the arc-shaped working surface of the lens processing tool becomes uniform in each portion of the lens surface. Further, when the pressing force of the lens holder shaft is canceled and the lens held by the lens holder supported in front of the lens holder is released, the lens slips along the arc-shaped processing surface of the lens processing hole and is not damaged. In addition, since the posture of the lens at the time of completion of machining is always in the horizontal state, it is possible to efficiently perform the lens exchange operation with respect to the lens holder by using the automatic transfer device.

Further, the lens processing apparatus according to the present invention can be processed in many kinds of lens processing modes such as an Oscar type, a biaxial type, and a planetary oscillating type by one lens, so that the versatility is high. Therefore, since it is not necessary to prepare lens processing apparatuses of various types individually, facility cost and installation space are reduced, which is very economical.

1 is a schematic view of a lens processing apparatus to which the present invention is applied.
Fig. 2 is an explanatory view showing a lens processing mode in a state in which the lens is horizontally held by the lens processing apparatus of Fig. 1. Fig.
3 is an explanatory view showing a separate lens processing mode by the lens processing apparatus of FIG.

Hereinafter, an embodiment of a lens processing apparatus (lens processing apparatus) to which the present invention is applied will be described with reference to the drawings.

1 and 2, the lens machining apparatus 1 according to the present embodiment includes a top shaft unit (upper shaft unit) 10 and a lens barrel 10 disposed immediately below the top shaft unit 10 A conveyor unit 50 disposed at a height position between the upper shaft unit 10 and the lower shaft unit 30 and a control unit And a drive control unit (motion control unit)

The upper housing unit 10 supports a lens holder 12 for supporting a lens 11 to be processed downward. The lowering unit 30 supports the lens processing tool 31 for lens surface processing in a state of facing upward. The conveyor unit 50 is for supplying the lens 11 to be processed to the lens holder 12 and for collecting the lens 11 after completion of the processing from the lens holder 12.

The upper housing unit 10 is provided with a lens holder shaft 13 arranged in the vertical direction and a pivot bearing mechanism 14 The lens holder 12 is attached in a state of facing downward. On the lens supporting surface 12a facing downward in the lens holder 12, the lens 11 to be processed can be attracted and supported by, for example, a vacuum process.

The upper housing unit 10 further includes an X-axis moving mechanism (X-axis moving mechanism) 15 for moving the lens holder shaft 13 in the X-axis direction extending in the horizontal direction, And a Z-axis moving mechanism 19 for transmitting the Z-axis direction extending in the Z-axis direction. In this example, the X-axis moving mechanism 15 includes an X-axis guide (X-axis guide) 16 extending in the horizontal direction, an X-axis table 16 An X-axis transfer screw 17 for transferring the X-axis table 16a in the X-axis direction, an X-axis servo motor (X-axis transfer table) 18). The Z-axis moving mechanism 19 includes a Z-axis guide 20 attached to the surface of the X-axis table 16a and extending perpendicularly to the X-axis and extending in the vertical direction, Axis table 20a, a Z-axis feed screw 21 for feeding the Z-axis table 20a in the Z-axis direction, and a Z-axis servo motor 22 as a drive source.

A holder shaft base 23 is fixed to the Z-axis table 20a of the Z-axis moving mechanism. The holder shaft base 23 is vertically movable with the lens holder shaft 13 rotatable . The lens holder shaft 13 is always urged downward by the holder pressing spring 24. The pressing force by the holder pressing spring 24 can be adjusted by the pressure adjusting bolt 25. [ The method of pressurization may be a weight, an air pressure cylinder, or a hydraulic cylinder in addition to the spring. The lens holder shaft 13 is rotated around its central axis 13a by a holder shaft driving motor 26 mounted on the holder shaft base 23 .

Various structures can be employed as the pivot bearing mechanism 14 between the lens holder shaft 13 and the lens holder 12. The lens holder 12 is provided on the back surface of the lens holder shaft 13 supported by the lens holder shaft 13, It may be attached in such a state that it can be oscillated about the position (rear surface position) 12b and rotatable around the central axis 13a. When the lens 11 is attracted and supported by the lens holding surface 12a of the lens holder 12 by vacuum suction, a vacuum suction path for vacuum suctioning the lens 11 is provided on the lens holder shaft 12, It is necessary to draw out the pivot bearing 13 and the pivot bearing mechanism 14 so as to be opened to the lens supporting surface 12a of the lens holder 12. It is preferable to employ a pivot bearing mechanism 14 suitable for forming such a vacuum suction path.

Next, the lowering unit 30 is configured to rotate the lens processing tool 31 such that the lens processing tool 31 rotates about the? Axis 32 orthogonal to both the X axis and the Z axis and horizontally extending in the front- Axis turning mechanism 33 and a Y-axis moving mechanism 36 for moving the lens processing tool 31 in the horizontal direction parallel to the? -Axis 32. The Y- The? -axis turning mechanism 33 includes a? -axis servo motor 34 having a rotation shaft 34a having the? -axis 32 as a central axis and a? -axis servo motor 34 having an L-shaped Brackets 35 of the < / RTI > The Y axis moving mechanism 36 has a spindle case 37 and a Y axis micro head 38 defining a position of the spindle case 37 in the Y axis direction have. The spindle case 37 is mounted on the? Bracket 35 in a state movable in the Y-axis direction.

A spindle 39 is supported on the spindle case 37 so as to rotate. The spindle 39 is rotationally driven by the spindle drive motor 40. At the upper end of the spindle 39, a lens processing tool 31 is attached upward in a coaxial state. The spindle case 37, the spindle 39 and the spindle drive motor 40 constitute a rotation mechanism (rotation mechanism) 41 of the lens processing tool 31. [

On the other hand, the conveyor unit 50 includes a conveyor 52 for conveying a lens case 51 and a conveyor drive motor 53 for rotating the conveyor 52. The conveyor 52 and the conveyor drive motor 53 are positioned between the upper unit 10 and the lower unit 30 by a conveyor front and rear cylinder 54, You can move to the evacuated location.

An example of the lens conveyance operation by the conveyor 52 will be described. The conveyor 52 exchanges the lens case 51 containing the lens and the lens case 51 containing the raw lens by carrying the lens case 51 at the retracted position and finishing the process, The lens case 51 arriving at the end of the lens barrel 52 is transferred to the conveyor of the next process and receives the lens case 51 discharged from the conveyor of the previous process.

After this, the conveyor 52 advances to position the lens case 51 below the upper unit 10, to supply the lens 11 to the lens holder 12, or to supply the lens 11 from the lens holder 12 Receives the lens 11 and is moved to the retreat position.

The upper housing unit 10 is configured such that the lens holder 12 is positioned just above the lens case 51 mounted on the advancing conveyor 52 and the lens of the lens case 51 is fixed to the lens holder 12, It is adsorbed by vacuum treatment and once evacuated. After the lens case 51 is retracted together with the conveyor 52, the lens 11 supported by the lens holder 12 is moved to the processing position by the dish or cup-shaped lens processing tool 31. [

The lens 11 is retracted from the lens processing hole 31 by the lens holder 12 and the conveyor 52 is moved forward by the lens holder 12, The lens holder 12 waits for the case 51 to be positioned below the lens case 51 so that the lens holder 12 releases the attraction and drops the lens 11 onto the lens case 51, And stores it. Thereafter, the lens holder 12 is evacuated.

(Operation example)

An example of the operation by the lens processing apparatus 1 having this configuration will be described. 2 is an explanatory view showing a lens processing mode (lens processing mode) in which processing is performed while the lens 11 is held horizontally. The left side movement amount L (m) and the right side movement amount R (m) are set as the conditions of movement. The machining surface 31a of the lens processing tool 31 is a convex arcuate machining surface and the vertex 31b of the machining surface 31a is positioned on the θ- The processing tool 31 is attached to the upper end of the spindle 39. In the initial position, the center axis 13a of the lens holder shaft 13 and the rotation center line 31c of the lens processing tool 31 coincide with each other .

(M) in the X-axis direction and Zo (m) in the Z-axis direction, and the coordinate position on the side of the lower unit 30 at the initial position shown by the broken line in Fig. Theta] o (degrees). In this case, the lens surface 11a of the lens 11 and the convex arcuate shape processing 11a of the lens 11 are pressed while being pressed against the convex arc-shaped working surface 31a of the lens processing tool 31 while keeping the lens 11 in a horizontal state, The feed amount Zd in the Z-axis direction and the turning amount? D around the? -Axis along the X-axis feed amount Xd are set as follows so as to slide the surface 31a.

X = Xd (m)

? d = sin ^-1 (Xd / r) (degrees)

Zd = r (1 - cos? D) (m)

The feed amount Xd in the X-axis direction is gradually increased to move from the initial position Xo to L (m). The feed amount Zd (m) and the turning angle d (degree) in the Z axis direction according to the feed amount Xd are calculated and are synchronized with the feed in the X axis direction, Thereby performing the turning operation around the periphery. After the feed amount Xd becomes L (m), on the contrary, the feed amount Xd is gradually decreased to move from the initial position Xo to the negative side to R (m). Also in this case, the feeding operation in the Z-axis direction and the turning operation about the? -Axis are performed in conjunction with the feeding in the X-axis direction. Thus, the lens surface 11a can be processed while the lens 11 is held horizontally.

In the processing operation of the lens surface, the lens processing tool 31 is rotated by the lens processing tool rotation mechanism 41 around its rotation center line 31c. Since the lens surface 11a of the lens 11 is pressed against the processing surface 31a of the lens processing tool 31 from above, the lens 11 is rotated in accordance with the rotation of the lens processing tool 31. [ The processing operation is performed in a state in which the lens 11 is vacuum-adsorbed to the lens supporting surface 12a of the lens holder 12 or in a state in which the vacuum adsorption is released.

Here, when the moving stroke of the lens holder shaft 13 in the Z-axis direction is larger than the maximum value of the feeding amount in the Z-axis direction, calculation of Zd and drive control of the Z-axis moving mechanism can be omitted.

Further, by giving a positive value to the machining radius r, it is possible to process the lens surface 11a having a convex surface as shown in Fig. 2, and by giving a negative value, can do.

On the other hand, when the working radius r is infinite, transverse movement (transfer in the X-axis direction) only occurs. Thus, when combined with movement in the Y-axis direction, an Oscar-type lens processing mode can be realized. In addition, when the lens 11 and the lens processing hole 31 are fixed in the state of an arbitrary position and angle by stopping the movement in the X-axis, the Z-axis, and the Y-axis direction, , And an inclined-axis-type lens processing mode can be realized.

As shown in Fig. 3, the lens processing tool 31 is fixed in a vertical state and rotated by the lens processing tool rotation mechanism 41 in this state, and the Z axis movement mechanism 19 and the X axis movement mechanism It is also possible to drive the lens surface 11a by sliding the lens 11 along the lens processing surface 31a of the lens processing tool 31. [

(Other Embodiments)

In order to construct a simple means by which the work (lens) is small in number or the outer diameter is large or inexpensive, a turntable that rotates by electric and air indexes is arranged in place of the conveyor unit 50, And recovery may be performed. Of course, the work may be attached and detached by manual operation without using a work exchange device.

It is also possible to replace the Y-axis micro head 38 of the lowering unit 30 with a Y-axis moving mechanism composed of a feed screw and a servo motor. In this case, lens surface processing by the planetary system (free system) can be realized by simultaneously driving the Y-axis moving mechanism and the X-axis moving mechanism.

1: Lens processing device
10:
11: Lens
11a: lens surface
12: Lens holder
13: Lens holder shaft
13a: center axis
14: Pivot bearing mechanism
15: X-axis moving mechanism
16: X-axis guide
16a: X-axis table
17: X-axis feed screw
18: X axis servo motor
19: Z-axis moving mechanism
20: Z-axis guide
20a: Z-axis table
21: Z-axis feed screw
22: Z axis servo motor
23: Holder shaft base
24: Holder pressure spring
25: Pressure adjusting bolt
30: Lowering unit
31: Lens processing tool
31a:
3lb: Vertex
31c: rotation center line
32: theta axis
33: Theta-axis turning mechanism
34: θ axis servo motor
34a:
35: θ Bracket
37: Spindle case
38: Y-axis micro head
39: Spindle
40: Spindle drive motor
41: Lens processing tool rotation mechanism
50: Conveyor unit
51: Lens case
52: Conveyor
53: Conveyor drive motor
70: drive control unit

Claims (3)

A lens holder shaft extending in the vertical direction,
The lens holder is attached to the lower end of the lens holder shaft in a coaxial state through a pivot bearing and rotates about the pivot bearing about a lens capable of oscillating and ratting, A lens holder,
A Z-axis moving mechanism (Z-axis moving mechanism) for moving the lens holder axis in the vertical Z-axis direction,
An X-axis moving mechanism (X-axis moving mechanism) for moving the lens holder axis in a horizontal X-axis direction,
A lens processing tool having an arc-shaped machining surface of a convex or concave shape arranged to face upward to process a lens held by the lens holder,
A? -Axis turning mechanism (? -Axis turning mechanism) for swiveling the lens processing tool about a? -Axis extending in a horizontal direction orthogonal to the X-axis,
A lens processing tool rotating mechanism for rotating the lens processing tool about a central axis (central axis) of the lens processing tool passing through a? Axis,
Axis movement mechanism, the X-axis movement mechanism, the Z-axis movement mechanism, and the? -Axis rotation mechanism to move the lens holder in the X-axis direction attached to the lens holder shaft, move in the Z- And a drive control means (movement control means) for executing a plurality of kinds of lens processing modes by controlling the turning of the lens processing tool about the &thetas;
Respectively,
Wherein the lens processing mode by the drive control means is such that a lens to be processed supported on the lens supporting surface of the lens holder is moved horizontally from the upper side to the arcuate machining surface of the lens processing aperture pivoting about the & Axis driving mechanism, the X-axis moving mechanism, and the &thetas; -axis turning mechanism so that the X-axis moving mechanism, the Z-axis moving mechanism, and the & And a lens processing device (lens processing device).
The method according to claim 1,
In the lens processing mode in which processing is performed in a state in which the above-mentioned lens is held horizontally,
The leftward movement amount L (m) in the X-axis direction and the rightward movement amount R (m) in the X-axis direction are set as conditions for movement,
In the initial position, the center axis of the lens holder shaft and the rotation center line of the lens processing tool are aligned with each other,
Wherein the coordinate position of the lens holder at the initial position is defined as Xo (m) in the X-axis direction and Zo (m) in the Z-axis direction, and the turning angle of the lens processing tool is? The feed amount Zd of the lens holder in the Z-axis direction along the feed amount X = Xd (m) in the X-axis direction of the lens holder and the turning amount? D around the?
? d = sin ^-1 (Xd / r) (degrees)
Zd = r (1 - cos? D) (m)
Lens machining apparatus as set.
3. The method according to claim 1 or 2 ,
And a Y-axis moving mechanism (Y-axis moving mechanism) for moving the lens processing tool in a Y-axis direction parallel to the θ-axis.

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