JP2007118117A - Machining device and method for fly-eye lens forming die - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a machining device and method for a fly-eye lens forming die, capable of polishing not only a spherical surface shaped fly-eye lens but also a non-spherical surface shaped fly-eye lens and efficiently performing polishing with more polishing amount per fixed time. <P>SOLUTION: In this polishing machine 1, a polishing tool 19 of a projecting surface having almost the same curvature as that of a forming recessed surface mounted on a mounting stage 7 of a body to be machined is used. The body to be machined is moved at an X-direction stage 3 and a Y-direction stage 4 so that a rotation center of a head rotary shaft 15 may coincide with an optical axis of the forming recessed surface to be polished at first, the polishing tool 19 is brought into contact with the forming recessed surface, and polishing is performed by rotating a tool rotary shaft 18 around an optical axis c by the head rotary shaft 15, while rotating the polishing tool 19 by the tool rotary shaft 18. When polishing of the one forming recessed surface is finished, the optical axis of the next forming recessed surface is moved to coincide with a center shaft of the head rotary shaft 15 by X-axis and Y-axis, and the same polishing is performed. The polishing is successively performed for all forming recessed surfaces. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a processing apparatus and a processing method for a fly-eye lens mold that polishes an optical functional surface of a fly-eye lens mold that molds a fly-eye lens having a plurality of spherical or aspheric molding concave surfaces.

Conventionally, in fly eye lens mold manufacturing technology, a convex polishing tool that matches the molding concave shape of the fly eye lens mold is used, and the molding concave surface to be polished is placed at the center of rotation by an XY moving stage, and fly eye molding is performed. A polishing apparatus has been proposed that polishes the molding concave surface by rotating the mold and pivoting the polishing tool, and polishing the entire fly-eye lens molding die by repeating this process for the number of molding concave surfaces. . (For example, refer to Patent Document 1.)
JP 09-136253 A ([Summary], FIG. 1)

  However, since the technique of the above-mentioned Patent Document 1 is a ball center oscillating polishing device whose basic operation is used for lens polishing or the like, it is not applicable when the shape of the molding concave surface is other than a spherical surface. It has the problem that it is possible.

  In addition, when one lens constituting the fly-eye lens has a shallow concave surface with a large lens radius relative to the aperture, it shifts from the molding concave surface to be polished when the polishing tool swings in the center. Since the polishing cannot be performed, the swing angle must be reduced, and the relative speed of the polishing tool is reduced because the polishing tool is rotated. There is also a problem that working efficiency is poor.

  In view of the above-described conventional situation, the object of the present invention is a fly-eye lens that can polish not only a spherical shape but also an aspherical fly-eye lens type, and can polish efficiently with a larger polishing amount per fixed time. An object is to provide a processing apparatus and a processing method for a lens mold.

  In order to solve the above problems, first, a fly eye lens mold processing apparatus according to a first aspect of the invention is a fly eye lens mold processing apparatus for polishing a fly eye lens mold, which is tilted at an arbitrary angle. A tool rotation axis that rotates the polishing tool that is disposed and is attached to the tip, and a head rotation axis that is attached to the tool rotation axis and rotates the tool rotation axis around the optical axis of the molding concave surface of the mold, The eccentric slide part to which the head rotation shaft is attached and which changes the movement amount of the head rotation shaft in the radial direction of the molding concave surface of the molding die, and the relative positions of the head rotation shaft and the molding die are orthogonal to each other 3 And an NC device that is controlled so as to be movable in the axial direction.

  Next, the method for polishing a fly-eye lens mold of the second invention is the method for polishing a fly-eye lens mold using the processing apparatus for the fly-eye lens mold of the first invention. Using an elastic body having substantially the same curvature as the molding concave surface of the mold, polishing is performed by rotating the tool rotating shaft and the head rotating shaft while the polishing tool is in contact with the molding concave surface.

  Further, a polishing method for a fly-eye lens mold according to a third aspect of the present invention is the method for polishing a fly-eye lens mold using the processing apparatus for the fly-eye lens mold according to the first aspect, wherein the polishing tool is used as the molding concave surface. In order to polish while drawing a spiral trajectory, the depth direction of the molding concave surface and the amount of movement of the eccentric slide portion are changed so that the polishing tool contacts the cross-sectional shape of the molding concave surface, The polishing tool is rotated by the tool rotation shaft, and at the same time, the tool rotation shaft and the head rotation shaft are rotated by the eccentric slide portion.

First, according to the first invention, it is possible to revolve around the optical axis of the concave molding surface while rotating the polishing tool, and, for example, a ball by moving the eccentric slide portion and the Z axis while fixing the XY axis. Since the shape polishing tool can be moved along the cross-sectional shape of the molding concave surface, it is possible to provide a processing apparatus for efficiently polishing the molding concave surface having the spherical and aspherical shapes of the fly-eye lens mold. .

Next, according to the second invention, it is possible to provide a machining method capable of efficiently polishing a molding concave surface having a small spherical surface or aspheric surface using the processing device of the first invention.
Furthermore, according to the third invention, it is possible to provide a machining method capable of polishing even a molded concave surface having a large aspheric amount by using the machining apparatus of the first invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a front view of a molding surface of a fly-eye lens mold that is polished by the processing apparatus and processing method of the present invention. As shown in FIG. 1, in the fly-eye lens mold, the molding concave surface a (a1, a2, a3,..., An) has a hexagonal outer shape and is arranged in a honeycomb shape.

  FIG. 2 is a perspective view of a part of the molding concave surface of the fly-eye lens mold as seen obliquely from above. As shown in FIG. 2, each molding concave surface am (m = 1, 2, 3,..., N) has an optical axis b.

<Configuration>
FIG. 3 is an external perspective view of a polishing machine for polishing a fly-eye lens mold. As shown in FIG. 3, a polishing machine 1 as a processing apparatus for a fly-eye lens mold according to the present invention includes a frame base 2.

On the frame 2, the X-direction stage 3, the Y-direction stage 4, and the Z-direction stage 5 are sequentially stacked from bottom to top near one end portion (right end portion in the drawing) of the upper surface. Further, a workpiece attachment stage 7 for attaching a fly eye lens mold 6 is provided on the Z direction stage 5.

The X direction stage 3 is in the X direction as shown by the double arrow x, the Y direction stage 4 is in the Y direction as shown by the double arrow y, and the Z direction stage 5 is in the Z direction as shown by the double arrow z. These are configured to be movable in directions orthogonal to each other.

  Further, on the frame 2, a support column 8 is erected near the other end portion (the left end portion in the drawing) of the upper surface. The support column 8 is provided with a beam arm 9 projecting almost horizontally from the upper direction toward the above-described stages, and a polishing head 11 having a rotation center c is attached to the tip of the beam arm 9.

  FIGS. 4A and 4B are diagrams for explaining the configuration of the polishing head 11. As shown in FIGS. 4A and 4B (see also FIG. 3), the polishing head 11 includes a head rotating shaft driving unit 12 supported at the tip of the beam arm 9 and the head rotating shaft driving unit 12. An eccentric slide portion 13 held by the head rotation shaft drive unit 12 is provided so as to be movable eccentrically from the rotation center axis c.

The eccentric slide portion 13 includes a drive connecting portion 14 held by the head rotating shaft driving portion 12 and a head rotating shaft 15 coaxially integrated with the central axis of the driving connecting portion 14.
That is, the head rotation shaft 15 rotates coaxially with the rotation center axis c of the head rotation shaft drive unit 12 when not eccentric, and rotates while revolving around the rotation center axis c of the head rotation shaft drive unit 12 when eccentric. It is configured as an axis.

  A tool rotating shaft drive unit 17 and a tool rotating shaft 18 are disposed at a lower end portion of the head rotating shaft 15 so as to be supported by a support member 16 projecting sideways. A polishing tool 19 is attached to the tip of the tool rotating shaft 18.

  The tool rotation shaft 18 is coaxially and integrally attached to the rotation center axis of the tool rotation axis drive unit 17, and the center axis is the rotation center of the head rotation axis drive unit 12 as shown in FIG. It is set to have a predetermined inclination angle with respect to the axis c.

The polishing tool 19 is attached to the tip of the tool rotation shaft 18, and the tool rotation shaft 18 rotates the polishing tool 19 according to a command from the NC device 100.
The polishing tool 19 is made of an elastic body such as polyurethane having substantially the same curvature as the molding concave surface a (see FIGS. 1 and 2) of the fly-eye lens mold for polishing.

  The head rotation shaft drive unit 12 rotates the eccentric slide unit 14 around the rotation center c of the head rotation shaft drive unit 12 according to a command from the NC device 100, whereby the eccentric slide unit 14 and the head rotation shaft are rotated. 15, the tool rotation shaft 18 is rotated about the rotation center c of the rotation shaft drive unit 12.

With the above configuration, in the fly eye lens molding die processing apparatus of the present invention, the rotation center of the head rotation axis is centered on the optical axis of the molding concave surface to be polished by the X axis and the Y axis among the three axes orthogonal to each other. The head rotation axis can be rotated while the relative position of the head rotation axis and the molding concave surface is moved so that they coincide with each other, and the polishing tool is rotated by the tool rotation axis. Thereby, the polishing tool can be revolved around the optical axis of the molding concave surface while the polishing tool is rotated.

Further, the radius of revolution of the tool rotation shaft can be changed by changing the amount of eccentricity of the eccentric slide portion. Thereby, for example, a spherical polishing tool is used, and this spherical polishing tool can be moved along the cross-sectional shape of the molding concave surface by moving the eccentric slide portion and the Z axis while fixing the XY axes.

Then, by sequentially moving the molding concave surface that coincides with the rotation center of the head rotation axis on the X axis and the Y axis, the above polishing operation can be performed on all the molding concave surfaces. Thereby, the processing apparatus which can grind | polish the shaping | molding concave surface which has a spherical surface and an aspherical shape efficiently can be provided.

<Operation>
Next, the operation | movement which grind | polishes the fly eye lens shaping | molding die in the polisher 1 of the said structure is demonstrated concretely. Here, the curvature of the molding concave surface a is a spherical surface having an R (radius) of 30 mm, and the size of a circle inscribed in the six corners is 3 mm.

  Further, the polishing tool 19 used here has a shape obtained by cutting a part of a sphere of approximately R30 mm, and the material is made of elastic polyurethane as described above. The polishing tool 19 is attached to the tool rotating shaft 18.

FIG. 5 is a diagram showing the positional relationship between the spherical core d of the polishing tool 19 and the rotation center c of the head rotation driving device 12 and the operation state when the polishing tool 19 is attached to the tool rotation shaft 18.
As shown in FIG. 5, first, the eccentric amount of the eccentric slide portion 14 with respect to the rotation center c is set to 0 so that the spherical core d of the polishing tool 19 passes through the rotation center c of the head rotation driving device 12.

Next, in order to make the optical axis bm (see FIG. 2) of the molding concave surface am (first m = 1, see FIG. 1) to be polished coincide with the rotation center c of the head rotation driving device 12 of the polishing head 11. , X
The fly-eye lens mold 6 is moved by the direction stage 3 and the Y-direction stage 4.

After positioning the optical axis bm (m = 1) and the rotation center c in this way, the ply eye lens mold 6 is then raised and brought into contact with the polishing tool 19 by the Z direction stage 7.
In response to a command from the NC apparatus 100, the tool rotation shaft 18 rotates as indicated by an arrow f in FIG. On the other hand, the head rotation shaft 15 rotates as indicated by an arrow g in FIG. 5 to rotate the tool rotation shaft 18 around the rotation center c.

  As a result, the polishing tool 19 rotates by the tool rotation shaft 18 and revolves around the optical axis b1 by the head rotation shaft 15. The positions indicated by the solid line and the broken line of the polishing tool 19 in FIG. 5 indicate positions that face each other during the revolution.

The molding concave surface a1 is polished as described above. When the polishing is finished, the next molding concave surface a2 is polished in the same manner.
By repeating this operation, the molding concave surfaces a2 and a4 carved in the fly-eye lens mold are polished, and the next row is moved to a5 (see FIG. 1) and polished to an so that all molding concave surfaces a are polished. Grind.

As described above, in the fly eye lens molding die polishing method of this example, first, a convex polishing tool having substantially the same curvature as the molding concave surface is used, and then the rotation of the head rotation shaft about the optical axis of the molding concave surface to be polished. Move the X and Y axes so that the centers coincide, and bring the polishing tool into contact with the molding concave surface, rotate the polishing tool by the tool rotation axis, and rotate the tool rotation axis around the optical axis by the head rotation axis. Polish.

When this polishing is completed for one molding concave surface, the optical axis of the next molding concave surface is moved to coincide with the central axis of the head rotation axis by the X axis and the Y axis, and the above polishing operation is performed in the same manner. This is sequentially performed on all the molding concave surfaces carved in the molding die, and the entire molding concave surface is polished.

Thereby, it is possible to provide a processing method capable of efficiently polishing a spherical concave surface or a molded concave surface having a small aspheric amount.
Further, in the fly eye lens molding die polishing method of this example, the polishing tool is rotated by the tool rotation shaft, so that the molding concave surface and the polishing tool can be compared with the oscillating spherical polishing by the conventional follow-up type polishing tool. Since the relative speed can be increased, polishing can be performed efficiently.

  In addition, since the polishing tool uses an elastic body, even if the concave surface of the object to be polished is not only a spherical shape but also an aspherical surface, if the degree of the aspherical surface is within the allowable range of elastic deformation of the polishing tool, copying is performed. Polishing is possible, and the polishing tool can be adapted to the molding concave shape well and can perform polishing regardless of the concave shape of the object to be polished.

  In addition, since the polishing tool is revolved by the head rotation shaft, it is possible to realize uniform and accurate polishing.

<Configuration>
The configuration of the polishing machine in the second embodiment is the same as the configuration of the polishing machine in the first embodiment shown in FIGS.

  In this example, the shape of the molding concave surface to be polished is an aspheric surface, and the degree of the aspheric surface is the elasticity of the polishing tool whose shape is set in accordance with the spherical molding concave surface as in the first embodiment. A description will be given of polishing in the case of having an aspherical amount that may cause insufficient polishing only by deformation.

In this example, unlike the case of Example 1, a spherical polishing tool having a radius smaller than the approximate radius of the aspherical molding concave surface is used as the polishing tool.
<Operation>
FIGS. 6A, 6B and 6C are diagrams showing the positional relationship between the spherical core of the polishing tool and the center of rotation of the polishing head and the operation state when the polishing tool is attached to the polishing head in this example. It is.

Also in this example, first, the X-direction stage 3 and the Y-direction stage 4 are processed so that the optical axis b of the molding concave surface e to be polished matches the rotation center c of the head rotation driving device 12 of the polishing head 11. The work on the body mounting stage 7 (a fly-eye lens having a molding concave surface e having an aspherical cross-sectional shape) is moved.

Next, while the X direction stage 3 and the Y direction stage 4 are fixed, the eccentric slide portion 13 is fixed.
And the Z stage 5 are moved so that the polishing tool 21 is in contact with the outer periphery i of the molding concave surface e as indicated by an arrow h in FIG.

The tool rotating shaft 18 rotates the polishing tool 21 according to a command from the NC. Then, the head rotation driving device 12 rotates the eccentric slide portion 13.
Then, the rotating polishing tool 21 revolves around the rotation center c of the head rotation driving device 12 while being in contact with the outer periphery i of the molding concave surface e.

  On the other hand, as shown in FIGS. 6A, 6B and 6C, the polishing tool 21 is moved from the outer periphery i of the molding concave surface e to the center of the molding concave surface along the aspherical cross-sectional shape of the fly-eye lens molding concave surface e. The eccentric slide part 13 and the Z direction stage 7 are moved by an NC program prepared in advance so as to move toward j.

FIG. 7 is a diagram showing a locus of polishing movement of the contact h between the forming concave surface e and the polishing tool 21 by the above operation.
As shown in FIGS. 6 (a), 6 (b), and 6 (c) described above, by rotating and moving each part, the polishing tool 21 is rotated by the tool rotating shaft 18 as shown in FIG. In this state, polishing is performed while drawing a spiral locus k on the molding concave surface e.

When the polishing of one molding concave surface is completed as described above, the other molding concave surfaces are similarly polished and all the molding concave surfaces are polished.
Thus, in the polishing method of the fly-eye lens mold of this example, first, a convex polishing tool having an R which is smaller than the molding concave surface is used, and then the rotation center of the head rotation axis is centered on the optical axis of the molding concave surface to be polished. Move the molding concave surface along the X-axis and Y-axis so that they coincide with each other, then bring the polishing tool into contact with the molding concave surface, and rotate the polishing tool with the tool rotation shaft, while offsetting the eccentric slide part along the shape of the molding concave surface. Polishing is performed by rotating the tool rotation axis around the optical axis with the head rotation axis while moving the core amount and the height of the molding concave surface.

When this polishing is completed for one molding concave surface, the optical axis of the next molding concave surface is moved to coincide with the central axis of the head rotation axis by the X axis and the Y axis, and the above polishing operation is performed in the same manner. This is sequentially performed on all the molding concave surfaces carved in the molding die, and the entire molding concave surface is polished.

  In this way, even when the aspherical surface is large and polishing cannot be performed only by using a convex polishing tool as an elastic body, the eccentric amount of the eccentric slide portion and the height of the object to be polished are matched with the molding concave shape. Since it can move, it is possible to provide a processing method capable of easily polishing even a molding concave surface having a large degree of aspherical surface.

  Also in this case, since the polishing tool is forcibly rotated by the tool rotating shaft, the relative speed between the polishing tool and the object to be polished can be increased, thereby increasing the relative speed between the molding concave surface and the polishing tool. Polishing can be performed efficiently.

It is the figure which looked at the molding surface of the fly eye lens shaping | molding die polished by the processing apparatus and processing method of this invention from the front. FIG. 2 is a perspective view of a part of the concave molding surface of the fly-eye lens mold shown in FIG. 1 as viewed obliquely from above. It is a perspective view of the polisher as a processing apparatus of the fly eye lens shaping | molding die of this invention. (a), (b) is a figure explaining the structure of the grinding | polishing head of a grinding machine. It is a figure which shows the positional relationship between the spherical core of a grinding | polishing tool and the rotation center of a grinding | polishing head, and its operation state when attaching a grinding | polishing tool to the grinding | polishing head in Example 1. FIG. (a), (b), (c) is a figure which shows the positional relationship of the spherical core of a polishing tool and the rotation center of a polishing head, and its operation state when attaching a polishing tool to the polishing head in Example 2. FIG. It is a figure which shows the locus | trajectory of the grinding | polishing movement of the contact of the shaping | molding concave surface and polishing tool in the grinding | polishing operation | movement of Example 2. FIG.

Explanation of symbols

a (a 1, a 2, a 3,..., an) Molding concave surface 1 Polishing machine 2 Frame base 3 X direction stage 4 Y direction stage 5 Z direction stage 6 Fly eye lens molding die 7 Workpiece attachment stage 8 Column 9 Beam Arm 11 Polishing head 12 Head rotation shaft drive unit 13 Eccentric slide unit 14 Drive connection unit 15 Head rotation shaft 16 Support member 17 Tool rotation shaft drive unit 18 Tool rotation shaft 19, 21 Polishing tool 100 NC device

Claims (3)

In a fly eye lens mold processing apparatus for polishing a fly eye lens mold,
A tool rotation axis for rotating a polishing tool arranged at an arbitrary angle and attached to the tip;
A head rotation axis that is attached to the tool rotation axis and rotates the tool rotation axis around the optical axis of the molding concave surface of the mold;
An eccentric slide part to which the head rotation shaft is attached and which changes the amount of movement of the head rotation shaft in the radial direction of the molding concave surface of the mold;
An NC device for controlling the relative position of the head rotation axis and the mold so as to be movable in three axial directions orthogonal to each other;
An apparatus for processing a fly-eye lens mold, comprising: In the method for polishing a fly eye lens mold using the fly eye lens mold processing apparatus according to claim 1,
Using an elastic body having substantially the same curvature as the molding concave surface of the mold as the polishing tool,
Polishing by rotating the tool rotation shaft and the head rotation shaft in a state where the polishing tool is in contact with the molding concave surface,
A method for polishing a fly-eye lens mold. In the method for polishing a fly eye lens mold using the fly eye lens mold processing apparatus according to claim 1,
To polish the polishing tool while drawing a spiral trajectory with respect to the molding concave surface,
While changing the depth direction of the molding concave surface and the amount of movement of the eccentric slide portion so that the polishing tool contacts the cross-sectional shape of the molding concave surface,
Rotating the polishing tool around the tool rotation axis and simultaneously rotating the tool rotation axis and the head rotation axis by the eccentric slide portion;
A method for polishing a fly-eye lens mold.

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