KR101671840B1 - A processing route generation method of rotation tool, tool path-generating device, machine tool and recording medium for processing program - Google Patents

Abstract

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of generating a machining path of a rotary tool capable of producing an F-theta lens without machining an optical defect through the production of an F-theta lens by precisely generating a path of a rotary tool.
A method for generating a machining path of a rotary tool according to the present invention is a method for generating a path of a rotary tool for machining a surface of an object by relatively moving a rotary tool having a cutting tool for cutting the surface of the object, A surface defining step of defining a three-dimensional surface shape of the object to be processed; A trajectory defining step of defining a three-dimensional turning trajectory of the cutting tool located at an end of the rotary shaft of the rotary tool; And a tangential plane (TP1) with respect to one point (P1) of the surface shape of the object defined in the surface definition step and a tangential plane (TP2) with respect to a contact point (P2) And generating a path of movement of the rotary tool such that the normal N1 to the point P1 and the normal N2 to the contact point P2 coincide with each other, .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of generating a path of a rotary tool, a tool path generating apparatus, a machine tool,

The present invention relates to a method of generating a path of a rotary tool, a tool path generating apparatus, a machine tool and a recording medium, and more particularly, to a method of manufacturing a path of a rotary tool by precisely generating a path of a rotary tool, , A method of generating a path of a rotary tool capable of producing an F-theta lens without an optical defect, a tool path generating apparatus, a machine tool and a recording medium.

Generally, a laser scanning unit refers to a device that generates a predetermined laser beam in accordance with an input signal, and images the generated beam on a photosensitive drum.

The laser scanning unit is used in, for example, a laser printer, a copying machine, and a multifunction peripheral, which reproduces an image by transferring a latent image formed on a photosensitive drum onto a medium such as paper. In recent years, .

FIG. 1 is a conceptual diagram schematically showing the configuration of a general laser scanning unit. FIG. 1 is a schematic view showing a configuration of a laser scanning unit, which includes a laser diode 11, a collimator lens 13, a cylindrical lens 15, a polygon mirror 23 A scanning mirror 25 for driving a polygon mirror, an F-theta lens 20, an imaging reflection mirror 18, a horizontal synchronizing mirror 12, and a photosensor 14.

The laser diode 11 emits a laser beam as a light source.

The collimator lens 13 converts the laser beam emitted from the laser diode 11 into parallel light with respect to the optical axis.

The cylinder lens 15 converts parallel light through the collimator lens 13 into linear fluorescent light in the horizontal direction with respect to the sub scanning direction.

The polygon mirror 23 moves the linearly polarized light in the horizontal direction through the cylinder lens 15 to the isosceles and scans them.

The polygon mirror driving scanning motor 25 rotates the polygon mirror 23 at a constant speed.

The F-theta lens 20 has a constant refractive index with respect to the optical axis and refracts the light of constant velocity reflected by the polygon mirror 23 in the main scanning direction and corrects the aberration to focus on the scanning surface.

The image-forming reflection mirror 18 reflects the laser beam through the F-theta lens 20 in a predetermined direction and forms a latent image on the surface of the photosensitive drum 16 as an image-forming surface.

The horizontal synchronizing mirror 12 reflects the laser beam through the F-theta lens 20 in the horizontal direction.

The optical sensor 14 receives the laser beam reflected by the horizontal synchronizing mirror 12 and synchronizes the laser beam.

Meanwhile, the F-theta lens 20 provided in the laser scanning unit 30 constructed as described above is generally injection-molded with a plastic such as an optical resin for productivity improvement and cost reduction.

However, since most of the conventional F-theta lenses are formed by injection molding, there are problems in that the physical properties of the parts are changed due to unevenness in temperature in the mold structure, or the shape is deformed due to cooling after injection.

In other words, it is necessary to maintain a high mold temperature uniformly when molding a molded article in a mold structure. However, in reality, the temperature of one side of the mold is high and the temperature gradually decreases toward the opposite side. The physical properties of the seta lens are changed, and optical defects of the lens occur due to the change of the physical properties.

In addition, since deformation also causes optical defects, it is practically inevitable to find a cooling condition that minimizes deformation by trial and error.

Registration No. 10-1317407 (Registration date October 04, 2013)

It is an object of the present invention to solve the above-mentioned problems in the prior art, and it is an object of the present invention to produce an F-theta lens without optical defects through the fabrication of an F- A tool path generating device, a machine tool, and a recording medium.

According to another aspect of the present invention, there is provided a method of generating a path of a rotary tool, the method comprising the steps of: rotating a rotary tool having a cutting tool for cutting a surface of the object, A path generation method comprising: a surface defining step of defining a three-dimensional surface shape of a workpiece to be machined; A trajectory defining step of defining a three-dimensional turning trajectory of the cutting tool located at an end of the rotary shaft of the rotary tool; And a tangential plane (TP1) with respect to one point (P1) of the surface shape of the object defined in the surface definition step and a tangential plane (TP2) with respect to a contact point (P2) And a path generating step of generating a path of movement of the rotary tool so as to coincide with each other.

According to another aspect of the present invention, there is provided a method of generating a path of a rotary tool, the method comprising the steps of: rotating a rotary tool having a cutting tool for cutting a surface of the object, A path generation method comprising: a surface defining step of defining a three-dimensional surface shape of a workpiece to be machined; A trajectory defining step of defining a three-dimensional turning trajectory of the cutting tool located at an end of the rotary shaft of the rotary tool; And a normal line N1 to a point P1 of the surface shape of the object defined in the surface definition step and a normal line N2 to a contact point P2 of the three-dimensional rotation locus tangent to the point P1 And a path generating step of generating a path of movement of the rotary tool so as to coincide with each other.

Preferably, the object to be processed is an f-theta lens.

Preferably, the three-dimensional surface shape of the F-theta lens can be determined by equation (1).

[Equation 1]

(Where each is defined as follows)

-

:X축 방향의 곡률반경(radious of curvature)-

: Radius of curvature in the X-axis direction

:Y축 방향의 곡률반경(radious of curvature)-

: Radius of curvature in the Y-axis direction

:X축 방향의 코닉계수(conic coefficient)-

: Conic coefficient in the X-axis direction

:Y축 방향의 코닉계수(conic coefficient)-

: Conic coefficient in the Y-axis direction

:비구면 계수-

: Aspherical coefficient

:렌즈의 표면 좌표-

: Surface coordinates of the lens

Preferably, the cutting tool is a ball mull, and the three-dimensional rotation locus of the ball mill can be determined by the following equation (2).

&Quot; (2) "

(Where each is defined as follows)

:렌즈의 표면 좌표-

: Surface coordinates of the lens

:회전공구의 이동 좌표-

: Movement coordinates of rotary tool

:회전공구의 회전축에서 볼밀에 의해 형성된 구의 반지름-

: Radius of a sphere formed by a ball mill at the rotational axis of the rotary tool

Preferably, the movement coordinates of the rotary tool may be determined by the following formulas (3) to (5).

&Quot; (3) "

&Quot; (4) "

&Quot; (5) "

(However, the + or - sign is determined depending on the convex and concave of the lens surface and the relative coordinates between the rotating tool and the lens)

(Where each is defined as follows)

:렌즈의 표면 좌표-

: Surface coordinates of the lens

:회전공구의 이동 좌표-

: Movement coordinates of rotary tool

:회전공구의 회전축에서 볼밀에 의해 형성된 구의 반지름-

: Radius of a sphere formed by a ball mill at the rotational axis of the rotary tool

-

-

only,

:X축 방향의 코닉계수(conic coefficient)-

: Conic coefficient in the X-axis direction

:Y축 방향의 코닉계수(conic coefficient)-

: Conic coefficient in the Y-axis direction

Preferably, the coordinate system of the rotary tool may be determined by: " (6) "

&Quot; (6) "

(Where each is defined as follows)

:렌즈의 표면 좌표-

: Surface coordinates of the lens

:회전공구의 이동 좌표-

: Movement coordinates of rotary tool

:공구장치의 좌표계와 렌즈의 좌표계의 편차 _-

: Deviation between the coordinate system of the tool unit and the coordinate system of the lens

- each component of the direction conversion matrix composed of a11 to a33 is configured to have one of 0, 1, and -1, and 1 and -1 are not arranged in a row and a column in a manner of overlapping. That is, the direction conversion matrix is composed of three components having a value of 1 or -1 and six components having a value of 0

According to another aspect of the present invention, there is provided a tool joint generating apparatus for generating a tool path for machining a surface of an object to be machined by a rotary tool having a cutting tool for cutting a surface of the object, A surface setting unit for setting a three-dimensional surface shape of the object to be processed; A tool setting unit for setting a three-dimensional rotation locus of the cutting tool located at an end of the rotary shaft of the rotary tool; And a tangential plane TP2 with respect to a point P1 of the surface shape of the object to be set in the surface setting unit and a tangential plane TP2 with respect to the contact point P2 of the three- And a path generating unit for generating a path of movement of the rotary tool so that the rotary tool and the rotary tool coincide with each other.

According to another aspect of the present invention, there is provided a tool joint generating apparatus for generating a tool path for machining a surface of an object to be machined by a rotary tool having a cutting tool for cutting a surface of the object, A surface setting unit for setting a three-dimensional surface shape of the object to be processed; A tool setting unit for setting a three-dimensional rotation locus of the cutting tool located at an end of the rotary shaft of the rotary tool; And a normal N2 to a point P1 of the surface shape of the object to be processed set in the surface setting unit and a contact point P2 of the three-dimensional rotational locus tangent to the point P1, And a path generating unit for generating a path of movement of the rotary tool so that the rotary tool and the rotary tool coincide with each other.

According to an aspect of the present invention, there is provided a machine tool for machining a surface of an object to be processed by a rotary tool having a cutting tool for cutting a surface of the object, A tool setting unit for setting a three-dimensional rotation locus of the cutting tool located at an end of the rotary shaft of the rotary tool; a tool setting unit for setting a three- And a path generating section for generating a path of movement of the rotary tool so that the normal line N1 and the normal line N2 to the contact point P2 of the three-dimensional rotational locus in contact with the point P1 coincide with each other. Generating device; And a machine body for moving the workpiece relative to the workpiece while rotating the rotary tool along a tool path generated by the toolpath generating device, and for machining a surface of the workpiece.

According to an aspect of the present invention, there is provided a machine tool for machining a surface of an object to be processed by a rotary tool having a cutting tool for cutting a surface of the object, A tool setting unit for setting a three-dimensional rotation locus of the cutting tool located at an end of the rotary shaft of the rotary tool; a tool setting unit for setting a three- A tool path including a tangential plane TP1 and a tangential plane TP2 which is tangential to the contact point P2 of the three-dimensional rotational locus tangent to the point P1, Generating device; And a machine body for moving the workpiece relative to the workpiece while rotating the rotary tool along a tool path generated by the toolpath generating device, and for machining a surface of the workpiece.

A computer-readable recording medium on which a program for executing the above-described method of generating a path of a rotary tool is recorded.

The present invention as described above has an advantage that an F-theta lens can be fabricated through a cutting process by precisely generating a path of a rotary tool, thereby making it possible to manufacture an F-theta lens without an optical defect.

1 is a conceptual diagram schematically showing a configuration of a general laser scanning unit.
2 is a perspective view illustrating an example of an F-theta lens as an object to be processed according to an embodiment of the present invention.
3 is a perspective view showing a processing point of an F-theta lens as an object to be processed according to an embodiment of the present invention.
4 is a perspective view showing a contact point of a three-dimensional rotation locus in contact with a processing point of the F-theta lens according to the embodiment of the present invention.
5 is a perspective view illustrating a state in which a three-dimensional rotation locus of a cutting tool located at an end of a rotary shaft of an F-setter lens as an object to be processed according to an embodiment of the present invention is in contact with each other and processing is performed.

The present invention may be embodied in many other forms without departing from its spirit or essential characteristics. Accordingly, the embodiments of the present invention are to be considered in all respects as merely illustrative and not restrictive.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms.

The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .

On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", "having", and the like are intended to specify the presence of stated features, integers, steps, operations, components, Steps, operations, elements, components, or combinations of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and a duplicate description thereof will be omitted.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

A method of generating a path of a rotary tool according to an embodiment of the present invention includes moving a rotary tool having a cutting tool for cutting a surface of an object to be processed 100 relative to the object to be processed 100, In a direction perpendicular to the rotational direction of the rotary tool.

Specifically, the path generation method of the rotary tool according to the present embodiment includes: a surface defining step (S100) of defining a three-dimensional surface shape to be machined of the object to be processed (100); a cutting A trajectory defining step S200 for defining a three-dimensional trajectory of the tool and a tangential plane TP1 for a point P1 of the surface shape of the object 100 defined in the surface defining step S100, The tangential plane TP2 to the contact point P2 of the three-dimensional rotation locus tangent to the point P1 coincides with each other or the normal line N1 to the point P1 and the normal line (S300) for generating a movement path of the rotary tool so that the rotation tool (N2) and the rotation tool (N2) coincide with each other.

First, the surface definition step S100 will be described.

The surface defining step S100 is a step of defining a three-dimensional surface shape 100a of the object to be processed 100a.

The object to be processed 100 may be an F-theta lens 100, and the F-theta lens 100 may be a three- The dimension surface shape 100a can be determined by the biconic-Zernike formula shown in Equation (1) below.

[Equation 1]

,

:X축 방향의 곡률반경(radious of curvature),

:Y축 방향의 곡률반경(radious of curvature),

:X축 방향의 코닉계수(conic coefficient),

:Y축 방향의 코닉계수(conic coefficient),

:비구면 계수)(only,

,

: Radius of curvature in the X-axis direction,

: Radius of curvature in the Y-axis direction,

: Conic coefficient in the X-axis direction,

: Conic coefficient in the Y-axis direction,

: Aspherical surface coefficient)

는 에프-세타 렌즈(100)의 3차원 표면 형상(100a)을 정의하는 z축 좌표값으로서, x축 좌표값이 'x'이고, y축 좌표값이 'y'일 때의 z축 좌표값이 'z'으로 설정되는 것을 의미하며, 각 축은 도 2에 도시된 바와 같이 정의될 수 있다. In Equation (1), the left side

Is a z-axis coordinate value defining a three-dimensional surface shape 100a of the F-theta lens 100 and is a z-axis coordinate value when the x-axis coordinate value is 'x' and the y-axis coordinate value is 'y' Is set to 'z', and each axis can be defined as shown in FIG.

For example, (x1, y1, z1), (x2, y2, z2), ... The three-dimensional surface shape 100a of the F-theta lens 100 can be defined by three-dimensional coordinates (x, y, z) defined by the above-mentioned expression (1)

As described above, the three-dimensional surface shape 100a of the object to be processed 100a, that is, the three-dimensional surface shape 100a of the F-theta lens 100, The surface shape 100a can be defined.

Next, the locus definition step S200 will be described.

The locus defining step S200 is a step of defining a three-dimensional rotation locus 200 of the cutting tool positioned so as to be centered on the end of the rotary shaft of the rotary tool.

In the method of generating a path of a rotary tool according to an embodiment of the present invention, the cutting tool may be a ball mull, and the three-dimensional rotation locus 200 of the ball mill may be expressed by the following equation 2].

&Quot; (2) "

:회전공구의 회전축에서 볼밀에 의해 형성된 구의 반지름, 도 4 참조)(only,

: The radius of the sphere formed by the ball mill at the rotational axis of the rotary tool, see Fig. 4)

는 상기 에프-세타 렌즈(100)의 3차원 표면 형상(100a)을 나타내는 좌표(x, y, z)의 표면을 가공하기 위한 볼밀의 회전 중심점 좌표(

)로서, 에프-세타 렌즈(100)의 표면을 가공하기 위한 회전공구의 이동 좌표이다. (X, y, z) representing the three-dimensional surface shape 100a of the F-theta lens 100 defined in the surface definition step S100 ,

(X, y, z) representing the three-dimensional surface shape 100a of the F-theta lens 100. The coordinates

And is a moving coordinate of a rotating tool for machining the surface of the F-theta lens 100. [

Specifically, the three-dimensional rotation locus 200 of the ball mill has a spherical shape as shown in FIG. 4, and the three-dimensional rotation locus 200 of the ball mill having a spherical shape is expressed by the following equations (1) and Can be defined as the same shape.

[Formula 1]

The three-dimensional rotation locus 200 of the ball mill defined by Equation 1 does not take into account the surface coordinates of the F-theta lens 100 and is defined as a point P1 of the surface shape of the F- And the point P2 of the three-dimensional rotation locus 200 are in contact with each other, the ball mill processes the surface of the F-theta lens 100. The three-dimensional rotation locus of the ball mill 200) is defined by the above-mentioned expression (2).

)로 정의되어 [수학식 2]로 정의되는 것이다. That is, one point of the three-dimensional rotation locus 200 of the ball mill is brought into contact with one point (x, y, z) of the surface of the F-theta lens 100 that is processed, If the movement coordinates of the rotary tool are (

), And is defined by Equation (2).

On the other hand, in the case of a rotary tool such as a ball mill, a part of the ball mill is provided with a machined surface of at least a sector shape, and a virtual circle extending at a curvature equal to or similar to the curvature of the machined surface, Dimensional rotation locus 200 can be formed.

Next, the path generation step (S300) will be described.

The path creating step S300 may include a tangential plane TP1 to one point P1 of the surface shape of the object 100 defined in the surface defining step S100 and a tangent plane TP1 to the point P1 The tangential plane TP2 to the contact point P2 of the dimensional rotation locus 200 coincides with each other or the normal line N1 to the point P1 and the normal line N2 to the contact point P2 coincide with each other The moving path of the rotary tool is generated.

Here, the normal N1 to one point P1 of the surface shape of the object 100 defined in the surface definition step S100 and the normal N1 of the three-dimensional rotation locus 200 tangent to the point P1 The fact that the normals N2 to the contact point P2 coincide with each other means that the tangent plane with respect to the point P1 and the tangent plane with respect to the contact point P2 coincide with each other.

Therefore, by using the above-mentioned equations (1) and (2), the equation (1) is derived so that the tangent plane with respect to the point P1 and the tangent plane with respect to the contact point P2 coincide with each other, The normal line N1 to the contact point P2 and the normal line N2 to the contact point P2 can be made to coincide with each other.

로 치환하고,

는 v로 치환하며,

는 w로 각각 치한하면 아래와 같은 [식 2]를 얻게 된다. In Equation (1) above,

, ≪ / RTI &

Is replaced with v,

Is given by w, we obtain [Equation 2] as follows.

[Formula 2]

Here, if u, v, and w are differentiated with respect to x and y respectively, the following Equation 3 is obtained.

[Formula 3]

Further, if [Expression 2] is partially differentiated with respect to x and y, the following Expression 4 is obtained.

[Formula 4]

로 치환하면 아래의 [식 5]과 같이 된다. here,

The following equation (5) is obtained.

[Formula 5]

That is, the tangent plane with respect to one point P1 of the surface shape of the object to be processed 100 defined in the surface definition step S100 can be defined by [Formula 5].

Equation (2) can be summarized as Equation (6) below.

[Formula 6]

Here, if [Expression 6] is differentiated with respect to x, y, and z, respectively, the following Expression 7 is obtained.

[Equation 7]

Here, it can be arranged as [Expression 9] and [Expression 10] according to [Expression 8] below.

[Equation 8]

,

,

[Equation 9]

[Equation 10]

only,

Therefore, [Expression 11] and [Expression 12] can be obtained.

[Equation 11]

[Equation 12]

Therefore, if [Expression 11] and [Expression 12] are substituted into [Expression 2] defining the three-dimensional rotation locus 200 of the ball mill, the following Expression 13 is obtained.

[Formula 13]

The above-described expression (13) can be defined by zt, which is the z coordinate of the tool, by the following expression (5).

&Quot; (5) "

(However, the + or - sign is determined depending on the convex and concave of the lens surface and the relative coordinates between the rotating tool and the lens)

On the other hand, [Expression 6] can be derived from [Expression 11], and Expression [7] can be derived from Expression 12.

&Quot; (3) "

&Quot; (4) "

That is, the x-coordinate xt of the tool is defined by Equation (4) and the y-coordinate yt of the tool is defined by Equation (4).

Meanwhile, the coordinate system of the rotary tool may be different from the coordinate system of the lens and the direction or the center point. In consideration of this point, the coordinate system of the rotary tool may be determined by the following equation (6).

&Quot; (6) "

(Where each is defined as follows)

:렌즈의 표면 좌표-

: Surface coordinates of the lens

:회전공구의 이동 좌표-

: Movement coordinates of rotary tool

:공구장치의 좌표계와 렌즈의 좌표계의 편차 _-

: Deviation between the coordinate system of the tool unit and the coordinate system of the lens

- each component of the direction conversion matrix composed of a11 to a33 is configured to have one of 0, 1, and -1, and 1 and -1 are not arranged in a row and a column in a manner of overlapping. That is, the direction conversion matrix is composed of three components having a value of 1 or -1 and six components having a value of 0.

For example, the above equation (6) can be defined as follows.

Meanwhile, the tool joint generating device according to an embodiment of the present invention generates a tool path for machining the surface of the object 100 by a rotary tool having a cutting tool for cutting the surface of the object 100 A tool clearance generating apparatus comprising: a surface setting unit for setting a three-dimensional surface shape (100a) of a workpiece (100) to be machined; A tool setting unit for setting a three-dimensional rotation locus (200) of the cutting tool located at an end of the rotary shaft of the rotary tool; And a normal line N1 to a point P1 of the surface shape of the object to be processed 100 set in the surface setting unit and a contact point P2 of the three-dimensional rotation locus 200 contacting the point P1. And a path generation unit for generating a movement path of the rotary tool so that the number N2 of the rotary tools coincides with each other.

A machine tool according to an embodiment of the present invention is a machine tool for machining a surface of an object to be processed 100 by a rotary tool having a cutting tool for cutting a surface of the object 100, A tool setting section for setting a three-dimensional rotation locus 200 of the cutting tool located at an end of the rotary shaft of the rotary tool, a surface setting section for setting a three- (N2) to the contact point P2 of the three-dimensional rotation locus 200 in contact with the aforementioned point P1 and the normal N1 to the one point P1 of the surface shape of the object 100 set in the above- And a path generating unit that generates a path of movement of the rotary tool so that the two paths coincide with each other; And a machine body for moving the workpiece 100 relative to the workpiece 100 while rotating the rotary tool along a tool path generated by the toolpath generating device to machine the surface of the workpiece 100.

On the other hand, a computer-readable recording medium on which a program for executing the above-described method for generating a path of a rotary tool is recorded.

Although the present invention has been described with reference to the preferred embodiments thereof with reference to the accompanying drawings, it will be apparent to those skilled in the art that many other obvious modifications can be made therein without departing from the scope of the invention. Accordingly, the scope of the present invention should be interpreted by the appended claims to cover many such variations.

100: object to be processed
100a: three-dimensional surface shape
200: Three-dimensional rotation locus

Claims (12)

A method of generating a path of a rotary tool for machining a surface of an object by relatively moving a rotary tool having a cutting tool for cutting the surface of the object,
A surface defining step of defining a three-dimensional surface shape of the object to be processed;
A trajectory defining step of defining a three-dimensional turning trajectory of the cutting tool located at an end of the rotary shaft of the rotary tool; And
A tangential plane TP1 to a point P1 of the surface shape of the object to be processed defined in the surface definition step and a tangential plane TP2 to a contact point P2 of the three-dimensional rotation locus tangent to the point P1, And a path creating step of creating a path of movement of the rotary tool so as to coincide with each other,
Wherein the object to be processed is an f-theta lens, and the three-dimensional surface shape of the F-theta lens is determined by Equation (1).
[Equation 1]

(Where each is defined as follows)
-

-

: Radius of curvature in the X-axis direction
-

: Radius of curvature in the Y-axis direction
-

: Conic coefficient in the X-axis direction
-

: Conic coefficient in the Y-axis direction
-

: Aspherical coefficient
-

: Surface coordinates of the lens A method of generating a path of a rotary tool for machining a surface of an object by relatively moving a rotary tool having a cutting tool for cutting the surface of the object,
A surface defining step of defining a three-dimensional surface shape of the object to be processed;
A trajectory defining step of defining a three-dimensional turning trajectory of the cutting tool located at an end of the rotary shaft of the rotary tool; And
A normal line N1 to a point P1 of the surface shape of the object to be processed defined in the surface definition step and a normal line N2 to a contact point P2 of the three-dimensional rotation locus tangent to the point P1, And a path creating step of creating a path of movement of the rotary tool so as to coincide with each other,
Wherein the object to be processed is an f-theta lens, and the three-dimensional surface shape of the F-theta lens is determined by Equation (1).
[Equation 1]

(Where each is defined as follows)
-

-

: Radius of curvature in the X-axis direction
-

: Radius of curvature in the Y-axis direction
-

: Conic coefficient in the X-axis direction
-

: Conic coefficient in the Y-axis direction
-

: Aspherical coefficient
-

: Surface coordinates of the lens delete delete 3. The method according to claim 1 or 2,
Wherein the cutting tool is a ball mill and the three-dimensional rotation locus of the ball mill is determined by the following equation (2).
&Quot; (2) "

(Where each is defined as follows)
-

: Surface coordinates of the lens
-

: Movement coordinates of rotary tool
-

: Radius of a sphere formed by a ball mill at the rotational axis of the rotary tool 3. The method according to claim 1 or 2,
Wherein the movement coordinates of the rotary tool are determined by the following equations (3) to (5).
&Quot; (3) "

&Quot; (4) "

&Quot; (5) "

(However, the + or - sign is determined depending on the convex and concave of the lens surface and the relative coordinates between the rotating tool and the lens)
(Where each is defined as follows)
-

: Surface coordinates of the lens
-

: Movement coordinates of rotary tool
-

: Radius of a sphere formed by a ball mill at the rotational axis of the rotary tool
-

-

only,

-

: Conic coefficient in the X-axis direction
-

: Conic coefficient in the Y-axis direction 3. The method according to claim 1 or 2,
Wherein the coordinate system of the rotary tool is determined by Equation (6).
&Quot; (6) "

(Where each is defined as follows)
-

: Surface coordinates of the lens
-

: Movement coordinates of rotary tool
_-

: Deviation between the coordinate system of the tool unit and the coordinate system of the lens
- each component of the direction conversion matrix composed of a11 to a33 is configured to have one of 0, 1, and -1, and 1 and -1 are not arranged in a row and a column in a manner of overlapping. That is, the direction conversion matrix is composed of three components having a value of 1 or -1 and six components having a value of 0. 1. A tool joint generating device for generating a tool path for machining a surface of an object by a rotary tool having a cutting tool for cutting a surface of the object,
A surface setting unit for setting a three-dimensional surface shape of the object to be processed;
A tool setting unit for setting a three-dimensional rotation locus of the cutting tool located at an end of the rotary shaft of the rotary tool; And
The tangential plane TP1 with respect to one point P1 of the surface shape of the object to be processed set in the surface setting unit and the tangential plane TP2 with respect to the contact point P2 of the three- And a path generating unit for generating a path of movement of the rotary tool so as to coincide with each other,
Wherein the object to be processed is an f-theta lens, and the three-dimensional surface shape of the F-theta lens is determined by Equation (1).
[Equation 1]

(Where each is defined as follows)
-

-

: Radius of curvature in the X-axis direction
-

: Radius of curvature in the Y-axis direction
-

: Conic coefficient in the X-axis direction
-

: Conic coefficient in the Y-axis direction
-

: Aspherical coefficient
-

: Surface coordinates of the lens 1. A tool joint generating device for generating a tool path for machining a surface of an object by a rotary tool having a cutting tool for cutting a surface of the object,
A surface setting unit for setting a three-dimensional surface shape of the object to be processed;
A tool setting unit for setting a three-dimensional rotation locus of the cutting tool located at an end of the rotary shaft of the rotary tool; And
The normal N1 to one point P1 of the surface shape of the object to be processed set in the surface setting unit and the normal N2 to the contact point P2 of the three- And a path generating unit for generating a path of movement of the rotary tool so as to coincide with each other,
Wherein the object to be processed is an f-theta lens, and the three-dimensional surface shape of the F-theta lens is determined by Equation (1).
[Equation 1]

(Where each is defined as follows)
-

-

: Radius of curvature in the X-axis direction
-

: Radius of curvature in the Y-axis direction
-

: Conic coefficient in the X-axis direction
-

: Conic coefficient in the Y-axis direction
-

: Aspherical coefficient
-

: Surface coordinates of the lens 1. A machine tool for machining a surface of an object to be processed by a rotary tool having a cutting tool for cutting a surface of the object,
A tool setting section for setting a three-dimensional rotation locus of the cutting tool located at an end of the rotary shaft of the rotary tool, a tool setting section for setting a three-dimensional surface profile of the object to be processed, The normal line N1 to one point P1 of the surface shape and the normal line N2 to the contact point P2 of the three-dimensional rotational locus tangent to the point P1 coincide with each other, A tool path generation unit that generates a tool path; And
And a machine body for moving the rotary tool relative to the object while rotating the rotary tool along a tool path generated by the tool path creating device,
Wherein the object to be processed is an f-theta lens, and the three-dimensional surface shape of the F-theta lens is determined by the following equation (1).
[Equation 1]

(Where each is defined as follows)
-

-

: Radius of curvature in the X-axis direction
-

: Radius of curvature in the Y-axis direction
-

: Conic coefficient in the X-axis direction
-

: Conic coefficient in the Y-axis direction
-

: Aspherical coefficient
-

: Surface coordinates of the lens 1. A machine tool for machining a surface of an object to be processed by a rotary tool having a cutting tool for cutting a surface of the object,
A tool setting section for setting a three-dimensional rotation locus of the cutting tool located at an end of the rotary shaft of the rotary tool, a tool setting section for setting a three-dimensional surface profile of the object to be processed, The moving path of the rotary tool is set such that the tangential plane TP1 with respect to one point P1 of the surface shape and the tangential plane TP2 with respect to the contact point P2 of the three- A tool path generation unit that generates a tool path; And
And a machine body for moving the rotary tool relative to the object while rotating the rotary tool along a tool path generated by the tool path generating device,
Wherein the object to be processed is an f-theta lens, and the three-dimensional surface shape of the F-theta lens is determined by the following equation (1).
[Equation 1]

(Where each is defined as follows)
-

-

: Radius of curvature in the X-axis direction
-

: Radius of curvature in the Y-axis direction
-

: Conic coefficient in the X-axis direction
-

: Conic coefficient in the Y-axis direction
-

: Aspherical coefficient
-

: Surface coordinates of the lens A computer-readable recording medium having recorded thereon a program for executing the method of generating a path of a rotary tool according to claim 1.

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