WO2008041441A1 - Moule métallique, dispositif optique, moule métallique servant à fabriquer un dispositif optique et leur procédé de fabrication - Google Patents
Moule métallique, dispositif optique, moule métallique servant à fabriquer un dispositif optique et leur procédé de fabrication Download PDFInfo
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- WO2008041441A1 WO2008041441A1 PCT/JP2007/067282 JP2007067282W WO2008041441A1 WO 2008041441 A1 WO2008041441 A1 WO 2008041441A1 JP 2007067282 W JP2007067282 W JP 2007067282W WO 2008041441 A1 WO2008041441 A1 WO 2008041441A1
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- Prior art keywords
- mold
- base material
- optical element
- diamond tool
- edge
- Prior art date
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- 230000003287 optical effect Effects 0.000 title claims abstract description 152
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 230000008569 process Effects 0.000 title claims abstract description 6
- 239000002184 metal Substances 0.000 title abstract 7
- 229910003460 diamond Inorganic materials 0.000 claims description 62
- 239000010432 diamond Substances 0.000 claims description 62
- 239000000463 material Substances 0.000 claims description 52
- 238000005520 cutting process Methods 0.000 claims description 37
- 238000000465 moulding Methods 0.000 claims description 32
- 239000000758 substrate Substances 0.000 claims description 2
- 239000013256 coordination polymer Substances 0.000 description 15
- 238000003754 machining Methods 0.000 description 11
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- 238000012546 transfer Methods 0.000 description 10
- 230000008859 change Effects 0.000 description 7
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- 229910000831 Steel Inorganic materials 0.000 description 1
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- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/42—Moulds or cores; Details thereof or accessories therefor characterised by the shape of the moulding surface, e.g. ribs or grooves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B1/00—Methods for turning or working essentially requiring the use of turning-machines; Use of auxiliary equipment in connection with such methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/18—Cutting tools of which the bits or tips or cutting inserts are of special material with cutting bits or tips or cutting inserts rigidly mounted, e.g. by brazing
- B23B27/20—Cutting tools of which the bits or tips or cutting inserts are of special material with cutting bits or tips or cutting inserts rigidly mounted, e.g. by brazing with diamond bits or cutting inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B5/00—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor
- B23B5/36—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning specially-shaped surfaces by making use of relative movement of the tool and work produced by geometrical mechanisms, i.e. forming-lathes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B1/00—Layered products having a non-planar shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C59/022—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing characterised by the disposition or the configuration, e.g. dimensions, of the embossments or the shaping tools therefor
- B29C2059/023—Microembossing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49995—Shaping one-piece blank by removing material
- Y10T29/49996—Successive distinct removal operations
Definitions
- the present invention relates to a mold, an optical element, a mold for molding an optical element, and a method for manufacturing the mold, and in particular, a mold suitable for processing a mold for molding an optical element.
- the present invention relates to an optical element, a mold for molding an optical element, and a manufacturing method thereof.
- a diffractive structure is formed on an optical surface, and optical characteristics are improved by the diffraction effect.
- the diffractive structure is generally a fine ring zone structure.
- the objective lens is formed by injection molding or the like using plastic as a raw material, a fine groove corresponding to the ring zone structure is formed in the mold. It is necessary to process and form the shape.
- a force generally using super steel or the like can be cut with a diamond tool.
- Patent Document 1 discloses a technique of cutting a fine groove shape while rotating a die material using a diamond tool having a rectangular rake face.
- Patent Document 1 Japanese Patent Laid-Open No. 2005-219185
- the machined mold does not have a 45-degree slope, which creates a diffractive structure in the transferred optical element. Does not occur! /, So the diffraction efficiency is kept high. That is, according to the prior art, due to the accidental event of cleaving the diamond tool, the accuracy of the dies will be different. There is a problem that optical characteristics (diffraction efficiency) vary greatly. On the other hand, it is conceivable to set the target maximum value of the diffraction efficiency of the optical element low in advance, but it is difficult to fundamentally solve the above-described variation reduction due to the cleavage of the tool.
- the present invention has been made in view of the problem of force, and for example, while ensuring the necessary efficiency in an optical element having a diffractive structure, it suppresses variations among dies used for the molding.
- the main objective is to provide a mold, an optical element, a mold for molding an optical element, and a method for manufacturing the same.
- Each of the ring zone structures is composed of a bottom surface having a predetermined width in the radial direction of the ring zone structure, a side wall surface, and a curved surface having a radius of curvature of 0.5 to 2 111 connecting the bottom surface and the side wall surface.
- the “curvature radius” is a value measured in a cross section along the optical axis.
- the term “consisting of a bottom surface (or top portion), a side wall surface, and a curved surface having a radius of curvature of 0.5 ⁇ 2 to 2 111 connecting the bottom surface and the side wall surface” refers to a plurality of formed rings.
- the entire belt is not limited to a curved surface, and it is sufficient that a part of the belt is connected by a curved surface in relation to usage efficiency.
- the relevant part of the belt may be connected with a curved surface! /.
- Such a mold is, for example, a step-shaped ring zone centered on the optical axis X as illustrated in FIG. It is suitable for forming a groove structure in which is repeated.
- Such a mold is suitable for forming a groove structure in which a plurality of annular wall walls having the same height around the optical axis X are formed, as exemplified in FIG. 1 (b).
- An optical element having an optical surface on which a plurality of annular zones formed concentrically around an optical axis are formed
- Each of the annular zones is composed of a top portion having a predetermined width in a direction perpendicular to the optical axis, a side wall surface, and a curved surface having a radius of curvature of 0.5 to 2 m connecting the top portion and the side wall surface.
- An optical element is composed of a top portion having a predetermined width in a direction perpendicular to the optical axis, a side wall surface, and a curved surface having a radius of curvature of 0.5 to 2 m connecting the top portion and the side wall surface.
- optical element according to the present invention can be formed by the mold described in 1. and thus has the same working effect.
- each of the plurality of annular zones has a stepped step structure.
- the stepped step structure is a structure in which a stepped ring zone centered on the optical axis X is repeated, as exemplified in FIG. 1 (a).
- each of the plurality of annular zones has a binary structure.
- the binary structure refers to a structure in which a plurality of annular wall having the same height around the optical axis X is formed as illustrated in FIG. 1 (b), for example.
- a diamond tool having a cutting edge composed of a rake face and a flank face and a rotationally driven die base material are relatively driven to cut, thereby forming a predetermined concentric circle on the die base material.
- the diamond tool or the mold base material in a direction perpendicular to the rotation axis of the mold A second step of cutting the mold base material while relatively driving,
- the diamond tool or the mold base material is relatively driven between the first step and the second step, the direction of the rotation axis of the mold and the direction orthogonal to the rotation axis are simultaneously displaced and the A method for manufacturing a mold for molding an optical element, comprising a third step of cutting a mold base material.
- the manufacturing method of the present invention while the diamond tool or the mold base material is relatively driven between the first step and the second step, the direction of the rotation axis of the mold Since there is a third step of cutting by simultaneously displacing in the direction orthogonal to the direction and the rotation axis, a predetermined surface intersecting both surfaces is formed at the intersection of the bottom surface of the groove and the side wall surface of the groove. Therefore, there is little change in the predetermined surface at the start and end of cutting, and the force S that suppresses the variation between the molds of the optical elements formed by a plurality of molds processed in this way is reduced.
- the method for producing an optical element molding die described in 9. is characterized in that, in the aspect described in 7., the curved surface has a curvature radius of 0.5 m to 2 m. Therefore, the required optical characteristics of the optical element transferred and formed using the optical element molding die manufactured thereby can be ensured.
- a method for producing a mold for molding an optical element comprising:
- the manufacturing method of the present invention while the diamond tool or the die base material is relatively driven between the first step and the second step, the direction of the rotation axis of the die Since there is a third step of cutting by simultaneously displacing in the direction perpendicular to the direction and the rotation axis, a curved surface can be formed at the intersection of the bottom surface of the groove and the side wall surface of the groove, There is little change in curvature of the curved surface at the end of cutting, and variations between optical molds formed by a plurality of molds processed in this way can be suppressed.
- examples of the “optical element” include a lens, a prism, a diffraction grating optical element (diffraction lens, diffraction prism, diffraction plate, chromatic aberration correction element), an optical filter (spatial low-pass filter, wavelength band-pass filter, Wavelength low-pass filter, wavelength high-pass filter, etc.), polarizing filter (analyzer, optical rotator, polarization separation prism, etc.), phase filter (phase plate, hologram, etc.) are not limited to the above.
- the present invention for example, in an optical element having a diffractive structure, it is possible to suppress variations among dies used for molding while securing necessary efficiency, which is obtained by the conventional technology.
- FIG. 2 is a perspective view of a biaxial ultra-precision machine 10 suitable for executing the method of machining a die with force according to the present embodiment.
- FIG. 3 is a perspective view of a diamond tool.
- FIG. 4 FIG. 4 (a) and its side view 4 (b) as viewed from the rake face side of the tip of the diamond tool T suitable for use in the machining method according to the present invention.
- FIG. 5 is a perspective view of a mold MD after being processed using the diamond tool shown in FIGS. 4 (a) and 4 (b).
- FIG. 6 is a schematic enlarged cross-sectional view of an optical transfer surface of a mold material M.
- FIG. 7 Enlarged views 7 (a) to 7 (c) showing the position of the diamond tool T during machining.
- FIGS. 8 (a) and 8 (b) are enlarged views of the periphery of the groove bottom surface and the groove side surface of the die cut by the diamond tool by the processing method of the present embodiment.
- FIGS. 9 (a) and 9 (b) are enlarged views of a groove bottom surface and a groove side surface of a die cut by a diamond tool by the machining method of the comparative example.
- FIG. 10 is a cross-sectional view illustrating an example of an optical element OE that can be used in an optical pickup device.
- FIG. 11 is a diagram showing a simulation result by the present inventor.
- FIG. 12 is a diagram showing a simulation result by the present inventor.
- FIG. 13 is a diagram showing a simulation result by the present inventor.
- FIG. 2 is a perspective view of a two-axis ultraprecision processing machine 10 suitable for executing the method of processing a die with force according to the present embodiment
- FIG. 3 is a perspective view of a diamond tool.
- an X-axis table 2 that is driven in the X-axis direction by a control device (not shown) is disposed on a base 1.
- a diamond tool T is attached on the X-axis table 2.
- a Z-axis table 4 driven in the Z-axis direction by a control device (not shown) is disposed on the base 1.
- a main shaft (rotating shaft) 5 that is driven to rotate by a control device (not shown) is attached.
- the spindle 5 can be attached with a mold for molding an optical element having a transfer optical surface to be processed.
- Diamond tool T A diamond tip Tc is attached to the tip of the tip, and the shape thereof will be described later with reference to FIGS. 4 (a) and 4 (b).
- the spindle 5 and the ⁇ ⁇ ⁇ spindle tables 2 and 4 are extremely rigid, and the spindle 5 At the same time, attach a die for molding the optical element, which is a work piece, rotate it at a spindle speed of lOOOOmin 1 , and cut the cutting edge with a diamond tool T under the conditions of a cutting depth of 1 am and a feed of 0 ⁇ 2 mm / min.
- An annular groove corresponding to the diffractive structure can be created on the optical transfer surface of the mold by cutting in the ductile mode so that the cutting point moves continuously during processing.
- FIGS. 4 (a) and 4 (b) are respectively a diagram viewed from the rake face T5 side of the tip of the diamond tool T suitable for use in the machining method of the mold, which is suitable for the present embodiment.
- FIG. In Fig. 4 (a) the diamond tool T is linearly extended in a direction orthogonal to the third edge T 3 (100 111 or less) of the tip extending in a straight line and both ends of the third edge T3.
- a first edge T1 and a second edge T2 extending in parallel are formed, and a rectangular rake face T5 is formed by these.
- the first edge T1 is connected to a fourth edge T4 that extends away from the second edge T2.
- the second edge T2 and the third edge T3 should be perpendicular to each other.
- the second edge T2 and the third edge T3 should be perpendicular to each other, but with a small arc R1 with a radius A (less than 0.5 m).
- the square is short of the edges T2 and T3 extending in parallel to each other! /, The edge of the second edge T2 on the fourth edge T4 side (distance / 3 from the tip).
- the area surrounded by the edges Tl, T2, ⁇ 3, and line ⁇ 6 by drawing a line T6 parallel to the first edge T1.
- FIG. 5 is a perspective view of the mold MD after being processed using the diamond tool of FIGS. 4 (a) and 4 (b), and FIG. 6 is a schematic enlarged sectional view of the optical transfer surface. It is.
- FIGS. 7A to 7C are enlarged views showing the position of the diamond tool T during processing.
- the mold MD processed by the processing method of the present embodiment has at least one optical function surface divided into a plurality of optical function regions centered on the optical axis, and at least one of the plurality of optical function regions. Is divided into a plurality of annular zones centered on the optical axis, and each annular zone is provided with a predetermined number of discontinuous steps, and the annular zones provided with the discontinuous steps are continuously provided. Arrangement It is preferable to be used for molding an optical element having a diffractive structure which is a structured.
- FIG. 10 is a cross-sectional view of an example of an optical element OE that can be used in an optical pickup device, but the diffraction structure is exaggerated.
- the diffractive structures DS1 and DS2 formed on the optical surfaces SI and S2 of the optical element OE and exhibiting a diffractive effect on the light beam passing through are formed concentrically around the optical axis O, and the optical axis It consists of an annulus having a top with a predetermined width in a direction perpendicular to O, and has a stepped shape, for example, in the cross section in the optical axis direction.
- the optical transfer surface of the mold MD as shown in Fig.
- the diamond tool T can move in the X-axis direction (also referred to as the direction approaching the rotation axis) and the Z-axis direction (also in the direction parallel to the mold rotation axis)! /
- a ring-shaped groove structure also simply referred to as a groove or a ring-shaped groove
- the shape of the power groove structure is assumed to be input in advance to the control device of the ultraprecision machine.
- a stepped step (also called a staircase) is deep.
- the “cutting direction” is a direction parallel to the rotation axis and approaching the mold.
- the material M of the mold is rotated around the optical axis (also referred to as the rotation axis) O, and the third edge T3 of the diamond tool T is moved to 4 in the groove structure G2 here.
- the diamond tool T cuts the optical transfer surface of the mold material M to form a ring-shaped groove, but the groove bottom surface (also referred to as the groove bottom surface) GB is formed by the third edge T3.
- the groove side on the outer peripheral side both the bottom wall surface of the groove! /, U) GO is cut by the first edge T1 It is cut (first step: see Fig. 7 (a)).
- the diamond tool T is placed in a direction perpendicular to the optical axis O of the mold material M (X axis right direction) and an axial direction (Z axis upward direction). Displace simultaneously (third step).
- the curved surface portion CP is formed between the groove bottom surface GB and the groove side surface GI on the inner peripheral side by the circular arc portion R1 between the second edge portion T2 and the third edge portion T3. It becomes.
- the curvature radius B of the curved surface portion CP is 0 ⁇ 5 111 to 2 111.
- the groove side GI on the inner peripheral side is cut by the second edge T2. (Second step). After that, as shown in Fig. 7 (c), the diamond tool T is displaced parallel to the optical axis O of the mold material M (to the right of the X axis), so that the second deepest step is formed. It will be.
- the groove structures G2 and G1 can be formed by displacing the diamond tool T in the same manner.
- the diamond type tool T is extracted from the mold material M and repeatedly displaced in the X-axis direction to repeat the binary type diffraction structure (Fig. 1 ( A mold MD suitable for forming a) can be formed.
- An optical element molding method using such a mold MD is described in, for example, Japanese Patent Application Laid-Open No. 2005-319778.
- the molten optical element material is injected into the mold shown in FIGS. 6 and 7 (a) to 7 (c), and further cooled to obtain the optical element OE1 shown in FIG. Can do.
- a mold with a plurality of annular zones having a stepped step structure or binary structure formed on the optical transfer surface is used, a stepped step structure is formed on the optical surface of the optical element by this mold. And multiple annular zones RZ with binary structure are transferred.
- an enlarged view of the cross section of one annular zone is shown in the circle of FIG.
- Each annular zone has a top ridge corresponding to the groove bottom GB of the mold and a side wall ⁇ corresponding to the groove side GI of the mold.
- the top ridge and the side wall ⁇ It is connected by curved surface OECP with a curvature radius of 0.5-2111 corresponding to the curved surface part CP.
- the top has a predetermined width in a direction orthogonal to the optical axis.
- the cross-sectional view of the stepped step structure is shown in the circle of FIG. 10.
- the shape of the annular zone structure of the optical element according to the present invention includes a top portion having a predetermined width in a direction perpendicular to the optical axis. It should be composed of a side wall surface and a curved surface with a radius of curvature of 0.5 to 2 m that connects the top and the side wall surface.
- the shape of FIG. 10 is not limited.
- the material of the optical element according to the present invention is not limited to plastic, and a general optical material of glass can be used.
- the optical element according to the present invention is formed by press molding, extrusion molding, mold molding, or other molding methods for forming known optical elements using the mold according to the present invention. May be.
- the corner of the rake face T5 of the diamond tool T may be lost due to cleavage due to cutting resistance.
- the shape force of the missing rake face T5 is transferred to the material M of the mold. Since the optical element transferred and molded by such a mold has a diffraction structure different from the design shape, there is a possibility that desired optical characteristics cannot be exhibited. Particularly problematic is the variation in shape between molds in an optical element formed by a plurality of molds. That is, if the diffraction efficiency of an optical element molded from another mold differs greatly from the diffraction efficiency of an optical element molded from a certain mold, the defective product rate may increase.
- FIGS. 8 (a) and 8 (b) are enlarged views of the periphery of the groove bottom surface and the groove side surface of the die cut by the diamond tool by the processing method of the present embodiment.
- (a) shows the groove at the start of cutting (first machining)
- Fig. 8 (b) shows the groove at the end of cutting (last machining).
- Figs. 9 (a) and 9 (b) are enlarged views of the groove bottom surface and the periphery of the groove side surface of the die cut by the diamond tool by the machining method of the comparative example
- Fig. 9 (a) is a cut view.
- Fig. 9 (b) shows the groove at the beginning (end of machining)
- Fig. 9 (b) shows the groove at the end of cut (end of machining).
- the light flux that has passed through the optical surface to which the groove bottom surface GB has been transferred exits at a desired diffraction angle, but the optical surface to which the curved surface CP has been transferred.
- the light beam that has passed through the surface is not emitted at a desired diffraction angle, but becomes unnecessary light. Therefore, in order to increase the diffraction efficiency of the optical element, it is inherently preferable that the area of the curved surface CP is zero.
- Such an ideal A typical groove structure (the shape shown in FIG. 9 (a)) can be obtained by cutting with a diamond tool T in which the second edge T2 and the third edge T3 intersect each other in a straight line.
- a curved CP force S is generated as shown in FIG. 8 (a), so that the diffraction efficiency of the transferred optical element can be increased. It is lower than the diffraction efficiency of the optical element transferred by the grooved mold as shown in Fig. 9 (a).
- the curved surface CP before the force deficiency D and the curved surface CP 'after the deficiency D have a small amount of change in area when viewed in the axial direction.
- the curvature radius B of the curved surface CP is at least 0.5 ⁇ 111, the light utilization efficiency Variations can be effectively reduced. If the radius of curvature B is 2 m or less, The absolute value of light utilization efficiency necessary for the scientific element can be secured. Therefore, by setting the curvature radius B to 0.5 111 to 2 111, it is possible to ensure the optical characteristics necessary for the optical element transferred and formed using the mold according to the present invention.
- FIGS. 11, 12, and 13 are diagrams showing simulation results by the present inventor, which are formed from a tool wear amount (defect length of the third edge T3) and a mold formed by the tool. It shows the relationship with the diffraction efficiency of the transferred optical element.
- Fig. 11 shows a conventional mold
- Fig. 12 shows a conventional mold designed with the maximum diffraction efficiency of the optical element reduced to 95%
- Fig. 13 is molded from the mold of this embodiment.
- the simulation results using the transferred optical element are shown.
- the radius of curvature B was set to 0.5 111. 11 to 12
- the vertical axis represents the diffraction efficiency (%) of the optical element
- the horizontal axis represents the tool wear amount m).
- the diffraction efficiency (design efficiency) in the state where the tool does not wear as shown in Fig. 11 is 100%, but if tool wear of 0.5 m occurs, the diffraction efficiency will vary by 11%.
- the simulation of the present inventor as shown in FIG. 12, even when the mold is designed so that the diffraction efficiency (design efficiency) is 95% in a state where the tool is not worn, it is 0.
- the processing method according to the present invention can be used for other than the processing of a mold for molding an optical element.
- the shape of the rake face may be a tapered shape instead of a square shape.
- the diamond tool is rotated Processing may be performed while displacing from the inside to the outside in the direction orthogonal to the axis optical axis.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
- Turning (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020097006094A KR101359118B1 (ko) | 2006-09-29 | 2007-09-05 | 금형, 광학 소자, 및 광학 소자 성형용 금형의 제조 방법 |
CN2007800357835A CN101516593B (zh) | 2006-09-29 | 2007-09-05 | 模具、光学元件及光学元件成型用模具的制造方法 |
JP2008505140A JP4158837B2 (ja) | 2006-09-29 | 2007-09-05 | 金型、光学素子、光学素子成形用の金型及びその製造方法 |
EP07806725A EP2067595A4 (en) | 2006-09-29 | 2007-09-05 | METAL MOLD, OPTICAL DEVICE, METALLIC MOLD FOR MANUFACTURING OPTICAL DEVICE, AND METHOD FOR MANUFACTURING THE SAME |
US12/442,422 US20100027122A1 (en) | 2006-09-29 | 2007-09-05 | Metal Mold, Optical Device, Metal Mold for Forming Optical Device, and Process for Manufacturing the Same |
US13/680,951 US9193115B2 (en) | 2006-09-29 | 2012-11-19 | Method of manufacturing an optical element |
Applications Claiming Priority (2)
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JP2006268492 | 2006-09-29 | ||
JP2006-268492 | 2006-09-29 |
Related Child Applications (2)
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US12/442,422 A-371-Of-International US20100027122A1 (en) | 2006-09-29 | 2007-09-05 | Metal Mold, Optical Device, Metal Mold for Forming Optical Device, and Process for Manufacturing the Same |
US13/680,951 Division US9193115B2 (en) | 2006-09-29 | 2012-11-19 | Method of manufacturing an optical element |
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WO2008041441A1 true WO2008041441A1 (fr) | 2008-04-10 |
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PCT/JP2007/067282 WO2008041441A1 (fr) | 2006-09-29 | 2007-09-05 | Moule métallique, dispositif optique, moule métallique servant à fabriquer un dispositif optique et leur procédé de fabrication |
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US (2) | US20100027122A1 (ja) |
EP (1) | EP2067595A4 (ja) |
JP (1) | JP4158837B2 (ja) |
KR (1) | KR101359118B1 (ja) |
CN (1) | CN101516593B (ja) |
TW (1) | TWI406749B (ja) |
WO (1) | WO2008041441A1 (ja) |
Cited By (1)
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---|---|---|---|---|
JP2014051025A (ja) * | 2012-09-07 | 2014-03-20 | Konica Minolta Inc | 金型の製造方法、切削工具、光学素子成形用の金型および光学素子 |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2011242762A (ja) * | 2010-04-23 | 2011-12-01 | Panasonic Corp | 回折光学素子及び光学機器 |
WO2016031897A1 (ja) * | 2014-08-29 | 2016-03-03 | シチズンホールディングス株式会社 | 工作機械及びこの工作機械の制御装置 |
CN215181234U (zh) * | 2018-07-18 | 2021-12-14 | 亚斯卡奈特股份有限公司 | 立体像成像装置 |
JP2020142403A (ja) * | 2019-03-04 | 2020-09-10 | セーレン株式会社 | 化粧シート |
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JP2004021077A (ja) * | 2002-06-19 | 2004-01-22 | Nikon Corp | 回折光学素子、回折光学素子成形用金型、回折光学素子の切削加工方法、回折光学素子成形用金型の切削加工方法、及び切削加工装置 |
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JP3774522B2 (ja) * | 1996-12-24 | 2006-05-17 | キヤノン株式会社 | 回折光学素子及びそれを有する光学機器 |
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2007
- 2007-09-05 JP JP2008505140A patent/JP4158837B2/ja not_active Expired - Fee Related
- 2007-09-05 CN CN2007800357835A patent/CN101516593B/zh not_active Expired - Fee Related
- 2007-09-05 WO PCT/JP2007/067282 patent/WO2008041441A1/ja active Application Filing
- 2007-09-05 KR KR1020097006094A patent/KR101359118B1/ko active IP Right Grant
- 2007-09-05 US US12/442,422 patent/US20100027122A1/en not_active Abandoned
- 2007-09-05 EP EP07806725A patent/EP2067595A4/en not_active Withdrawn
- 2007-09-26 TW TW096135748A patent/TWI406749B/zh not_active IP Right Cessation
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JP2005219185A (ja) | 2004-02-09 | 2005-08-18 | Konica Minolta Opto Inc | 加工方法 |
JP2005219187A (ja) * | 2004-02-09 | 2005-08-18 | Konica Minolta Opto Inc | 加工方法 |
JP2005319778A (ja) | 2004-04-09 | 2005-11-17 | Konica Minolta Opto Inc | 光学素子用成形金型、光学素子成形方法及び光学素子 |
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Also Published As
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US20100027122A1 (en) | 2010-02-04 |
EP2067595A4 (en) | 2012-03-21 |
US20130119569A1 (en) | 2013-05-16 |
KR101359118B1 (ko) | 2014-02-05 |
JPWO2008041441A1 (ja) | 2010-02-04 |
CN101516593A (zh) | 2009-08-26 |
US9193115B2 (en) | 2015-11-24 |
TWI406749B (zh) | 2013-09-01 |
CN101516593B (zh) | 2012-03-28 |
JP4158837B2 (ja) | 2008-10-01 |
EP2067595A1 (en) | 2009-06-10 |
TW200833488A (en) | 2008-08-16 |
KR20090075805A (ko) | 2009-07-09 |
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