WO2008072633A1 - レンズおよびその製造方法 - Google Patents
レンズおよびその製造方法 Download PDFInfo
- Publication number
- WO2008072633A1 WO2008072633A1 PCT/JP2007/073874 JP2007073874W WO2008072633A1 WO 2008072633 A1 WO2008072633 A1 WO 2008072633A1 JP 2007073874 W JP2007073874 W JP 2007073874W WO 2008072633 A1 WO2008072633 A1 WO 2008072633A1
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- WO
- WIPO (PCT)
- Prior art keywords
- lens
- region
- coat layer
- groove
- lens portion
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
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- 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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
- B29C41/042—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould by rotating a mould around its axis of symmetry
- B29C41/045—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould by rotating a mould around its axis of symmetry the axis being placed vertically, e.g. spin casting
-
- 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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/12—Spreading-out the material on a substrate, e.g. on the surface of a liquid
-
- 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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/34—Component parts, details or accessories; Auxiliary operations
- B29C41/36—Feeding the material on to the mould, core or other substrate
-
- 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
- B29D11/00865—Applying coatings; tinting; colouring
- B29D11/00894—Applying coatings; tinting; colouring colouring or tinting
- B29D11/00903—Applying coatings; tinting; colouring colouring or tinting on the surface
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
-
- 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
- B29L2011/0016—Lenses
Definitions
- the present invention relates to a lens having a coat layer and a method for manufacturing the same.
- a coating layer may be formed for various purposes.
- the coating layer include an antireflection film for preventing light from reflecting on the lens surface, a hard coat protective film for preventing the lens surface from being damaged, and correcting chromatic aberration of the lens substrate.
- a refractive index adjustment film for this purpose.
- the thickness of the coating layer needs to be uniform.
- a method of forming a coat layer having a uniform thickness it is possible to use mold forming. In mold molding, a lens base material is set in a mold, a coating layer material is poured between the lens base material and the mold, and the coating layer material is cured. Then the lens is removed from the mold. In this method, since the shape of the coat layer is defined by the mold, a coat layer having a uniform thickness can be formed.
- mass production is performed by mold forming, a large number of expensive molds are required, resulting in high production costs.
- the spin coating method is a method in which a material for a coating layer is dropped on a flat substrate, and then the material is applied to the substrate by rotating the substrate.
- the shape of the lens needs to be a shape in which the material of the coat layer smoothly flows on the lens curved surface. Therefore, when the spin coat method is used, the shape of the outer edge portion of the lens curved surface must be different from the desired lens curved surface. As a result, there was a problem that the outer edge portion of the lens did not perform the lens function sufficiently.
- an object of the present invention is to provide a lens having a coat layer with a uniform thickness and capable of being mounted accurately, and a method for manufacturing the same.
- the lens of the present invention includes at least a convex lens portion.
- the coat layer is formed on the lens portion.
- the method of the present invention for manufacturing a lens is a method for manufacturing a lens including a convex lens portion and a coat layer formed on the lens portion, and (i) the lens portion A step of preparing a lens base material including at least one first region including: a second region surrounding the first region; and (i) a step of disposing a material of the coat layer on the lens portion. And a groove surrounding the first region is formed between the first region and the second region of the lens substrate.
- a coat layer having a uniform thickness can be formed on the lens portion.
- the shape of the outer edge portion of the lens does not need to be a shape in which the material of the coat layer smoothly flows on the lens surface. Therefore, according to the present invention, the entire lens portion can effectively function as a lens. Further, according to the present invention, it is possible to suppress the formation of the coat layer in the second region surrounding the lens portion. Therefore, it is possible to accurately incorporate the lens into the device using the second region as a reference surface.
- FIG. 1A is a top view showing an example of a lens of the present invention
- FIG. 1B is a cross-sectional view thereof
- FIG. 1C is a top view of the lens substrate used in the lens shown in FIG. 1A.
- FIG. 2A to FIG. 2C are process diagrams showing an example of a method for forming a coating layer by a spin coating method.
- FIGS. 3A to 3D show an example of a method of forming a coat layer by a screen printing method. It is process drawing shown.
- FIG. 4A to FIG. 4D are process diagrams showing an example of a method for forming a coat layer by a pad printing method.
- FIG. 5A is a top view showing another example of the lens of the present invention
- FIG. 5B is a cross-sectional view thereof
- FIG. 5C is a top view of a lens substrate used in the lens shown in FIG. 5A.
- FIG. 6A is a top view showing another example of the lens of the present invention
- FIG. 6B is a sectional view thereof.
- FIG. 7A is a top view showing a lens of Comparative Example 1, and FIG. 7B is a cross-sectional view thereof.
- FIG. 8 is a diagram showing a method for measuring the thickness of a coat layer.
- FIG. 9 is a graph showing the measurement results of the thickness of the coating layer for the lens of Example 1 and the lens of Comparative Example 1.
- FIG. 10 is a graph showing the measurement results of the thickness of the coating layer for the lens of Example 2 and the lens of Comparative Example 2.
- FIG. 11A is a top view showing a lens of Comparative Example 3, and FIG. 11B is a sectional view thereof.
- FIG. 12 is a diagram showing a method for measuring the thickness of a coat layer.
- FIG. 13 is a graph showing the measurement results of the coating layer thickness for the lens of Example 3 and the lens of Comparative Example 3.
- FIG. 14 is a graph showing the measurement results of the thickness of the coating layer for the lens of Example 4 and the lens of Comparative Example 4.
- FIG. 15 is a graph showing the measurement results of the thickness of the coating layer for the lens of Example 5.
- FIG. 16 is a graph showing the measurement results of the coating layer thickness for the lens of Comparative Example 5.
- FIG. 17A is a top view showing a lens substrate used in Example 6, and FIG. 17B is a cross-sectional view thereof.
- FIG. 18 is a graph showing the measurement results of the thickness of the coating layer for the lens of Example 6.
- FIG. 19 is a graph showing the measurement results of the coating layer thickness for the lens of Comparative Example 6.
- FIG. 20 is a graph showing the measurement results of the thickness of the coating layer for the lens of Example 7 and the lens of Comparative Example 7.
- FIG. 21 is a graph showing the measurement results of the coating layer thickness for the lens of Example 8 and the lens of Comparative Example 8.
- the lens of the present invention includes at least one first region including a convex lens portion and a second region surrounding the first region.
- a groove surrounding the first region is formed between the first region and the second region.
- a coat layer is formed on the lens portion.
- the member including the first and second regions may be referred to as a “lens substrate”.
- the lens base material can be made of glass or transparent synthetic resin.
- Each first region includes a convex lens portion.
- the diameter of the lens portion may be in the range of lmm to 10mm.
- the shape of the lens is determined according to the application.
- the shape of the lens part may be a spherical shape or an aspherical shape.
- the lens unit may be a diffractive lens.
- a typical diffraction lens has a shape in which a plurality of cylinders having different diameters are stacked so that the diameter decreases toward the top. Such a shape is called a brazed grating.
- a coat layer is formed on the surface of the lens portion.
- the type of coat layer to be formed is selected according to the application.
- Coating layer is antireflection film, hard coat protective film, refractive index
- An adjustment film may be used.
- the antireflection film prevents light from being reflected from the lens surface.
- the hard coat protective film prevents the lens surface from being damaged.
- the refractive index adjustment film corrects chromatic aberration.
- the coat layer may be composed of a single layer or may be composed of a plurality of layers.
- the material of the coating layer is selected in consideration of the application and forming method of the coating layer.
- the material of the coat layer is, for example, a transparent synthetic resin.
- the material of the coat layer may contain an inorganic filler for adjusting optical properties.
- the groove is formed in an annular shape so as to surround the periphery of the lens portion.
- the groove may not be a complete ring.
- the groove may be an annular groove divided at some places.
- a coat layer is formed on at least a part of the first region and the groove, and no coat layer is formed on the second region. According to this configuration, it is possible to accurately incorporate the lens into the apparatus using the second region as a reference plane.
- the second area may be flat or may have other shapes for easy positioning! /.
- the entire first region may be a lens portion.
- a groove surrounding the first region may be adjacent to the lens unit. According to this configuration, the uniformity of the thickness of the coat layer in the outer edge portion of the lens portion can be particularly improved.
- the lens of the present invention may include a plurality of first regions. That is, the lens of the present invention may include a plurality of convex lens portions.
- the method of the present invention for producing a lens is a method for producing a lens comprising a convex lens part and a coat layer formed on the lens part. According to this method, the lens of the present invention can be manufactured. In addition, since it can apply to the manufacturing method of this invention about the matter demonstrated regarding the lens of this invention, the overlapping description may be abbreviate
- the production method of the present invention includes the following steps (i) and (ii).
- a lens base material including at least one first region including the lens portion and a second region surrounding the first region is prepared. Between the first area and the second area of the lens substrate Has a groove surrounding the first region. Since the lens substrate has been described in the first embodiment, a duplicate description is omitted. There is no limitation in the formation method of a lens base material.
- the lens substrate can be formed by a known method such as a casting method, a press molding method, or an injection molding method.
- the material of the coat layer is disposed in the lens portion.
- the material of the coat layer may be applied to the entire surface of the lens portion.
- the coating layer material may be applied to a part of the lens part (for example, the top part) and then moved downward on the surface of the lens part, and as a result, applied to the entire surface of the lens part. . Excess material is accumulated in the groove. As a result, the formation of a coat layer in the second region is suppressed.
- the material of the coat layer is disposed in the first region.
- a coat layer is formed on the first region in the step (ii). The material applied to the lens is cured as necessary. As a result, a coat layer is formed on the surface of the lens portion.
- the material of the coat layer is selected according to the coat layer to be formed. Depending on the coating method of the coating layer material, the coating layer material may be diluted with a solvent.
- the method for curing the material of the coat layer is selected according to the material of the coat layer. For example, when an ultraviolet ray curable resin is used, curing is performed by ultraviolet ray irradiation (UV irradiation). In addition, the curing may be avoided by performing a heat treatment after removing the solvent contained in the material of the coat layer.
- UV irradiation ultraviolet ray irradiation
- a coat layer is formed in at least a part of the first region and the groove, and no coat layer is formed in the second region. Since the coat layer is not formed in the second region, the second region can be used as a reference plane. In a typical example, the coat layer is formed on the entire surface of the lens portion and at least a part of the groove, and is not formed in the second region.
- the material of the coating layer may be disposed on the lens portion by a spin coating method.
- the coating layer material may be disposed on the lens portion by screen printing.
- the material of the coat layer may be disposed on the lens portion by a pad printing method.
- FIG. 1A A top view of the lens of Embodiment 1 is shown in FIG. 1A, and a cross-sectional view taken along line IB-IB in FIG. 1A is shown in FIG. 1B.
- a lens 100 shown in FIGS. 1A and 1B includes a lens substrate 10 and a coat layer 14 formed on the lens substrate 10.
- a top view of the lens substrate 10 is shown in FIG. 1C.
- the lens substrate 10 includes a first region 11 including a convex lens portion 11a and a second region 12 surrounding the first region 11.
- the entire first region 11 is the lens portion 11a.
- the lens unit 11a is a lens having a circular bottom surface.
- the surface shape of the lens portion 11a may be a spherical surface or an aspherical surface.
- a groove 13 is formed between the first region 11 and the second region 12.
- the groove 13 is formed in an annular shape so as to surround the lens portion 11a.
- the center of the planar shape of the groove 13 coincides with the center of the planar shape of the lens portion 11a.
- the coat layer 14 is formed on the entire surface of the lens portion 11a (first region 11) and part of the groove 13. The coat layer 14 is not formed on the second region 12.
- the groove 13 is formed so as to be adjacent to the outer edge of the lens portion 11a. According to this configuration, when forming the coat layer 14, it is possible to store excess material present in the outer edge portion of the lens portion 11 a in the groove 13. For this reason, the force S can be used to particularly increase the thickness uniformity of the coating layer 14.
- the lens substrate 10 is formed.
- the lens substrate 10 can be formed by a casting method, a molding method such as press molding or injection molding method, a cutting method, or a combination thereof.
- the groove 13 may be formed by a technique such as cutting after the first region 11 and the second region 12 are formed.
- the groove 13 may be formed by integral molding when the first region 11 and the second region 12 are formed.
- a coat layer 14 is formed on the surface of the lens portion 11a.
- a method for forming the coating layer 14 for example, a spin coating method, a screen printing method, and a pad printing method can be employed. These are low cost and excellent productivity methods.
- the lens substrate 10 is placed on the rotary stage 25 and rotated. And while the glass substrate 10 is rotating, the material 14a of the coat layer 14 is dropped onto the center of the lens portion 11a. Note that the material 14a of the coat layer 14 may be dropped onto the center of the lens portion 1la in a state where the lens substrate 10 is fixed.
- the lens substrate 10 is rotated at a high speed to spread the material 14a on the surface of the lens portion 11a as shown in FIG. 2B.
- the surplus material 14 a is stored in the groove 13 and is not applied to the second region 12.
- the coated layer 14 is formed by hardening the applied material 14a.
- the viscosity of the material 14a is preferably 0.1 lPa ′s or less.
- FIGS. An example of forming the coating layer 14 by screen printing is shown in FIGS.
- a transmission part 31a corresponding to the lens part 11a is capable of transmitting the material 14a of the coat layer 14.
- material 14a is arranged on the screen plate 31.
- the material 14 a on the screen plate 31 is moved by the scraper 32.
- the material 14a is pressed against the transmission part 31a by a squeegee 33.
- a part of the material 14a passes through the transmission part 31a, and the material 14a is disposed on the lens part 11a as shown in FIG. 3D.
- the coating material 14 is formed by curing the applied material 14a.
- Screen printing is generally used when a paint is applied to a planar member.
- a flexible resin screen plate, the lens unit 11a, etc. It is possible to apply paint to a curved surface.
- the material 14a can be disposed almost only on the lens portion 11a by using an appropriate screen plate. Therefore, by using the screen printing method, the amount of the material 14a adhering to the region other than the lens portion 11a can be reduced.
- the transmitting portion 31a In order to cover the entire lens portion 11a with the coating layer 14, the transmitting portion 31a needs to be slightly larger than the lens portion 11a.
- a liquid pool phenomenon occurs at the outer edge portion of the lens portion 11a.
- the method of the present invention since the grooves 13 are formed around the lens portion 11a, such a liquid pool phenomenon can be suppressed.
- the presence of 13 makes it easier for the screen plate 31 to adhere to the outer edge portion of the lens portion 11a. Therefore, it is possible to particularly improve the uniformity of the thickness of the coat layer 14.
- the viscosity of the material 14a is preferably in the range of 0.1 lPa's to lOOPa's.
- the node printing method since printing is performed using a flexible member (for example, a silicon pad), it is possible to perform good printing on a curved surface or a surface having unevenness. Further, by selecting an appropriate printing plate and an appropriate pad, it is possible to apply the material 14a only to a predetermined portion. However, in order to apply the material 14a to the entire lens unit 11a, the pattern is slightly larger. It is necessary to print using a single-pressed printing plate 41. Therefore, even in the node printing method, when there is no groove 13, a liquid pool phenomenon occurs at the outer edge portion of the lens portion 11a. On the other hand, in the method of the present invention, since the groove 13 is formed around the lens portion 11a, such a liquid pool phenomenon can be suppressed. In addition, the groove 13 can suppress the formation of a coat layer in the second region 12. Therefore, the second region 12 can be used as a reference plane.
- a flexible member for example, a silicon pad
- the material 14a is arranged by the node printing method, since the groove 13 exists in the outer edge portion of the lens portion 1la, the pad is easily adhered to the outer edge portion of the lens portion 11a. Therefore, the thickness uniformity of the coat layer 14 can be particularly improved.
- the material 14a When the material 14a is disposed on the lens portion 11a by the node printing method, the material 14a needs to move from the printing plate to the pad, and then from the pad onto the lens portion 11a. Further, after the material 14a is disposed on the lens portion 11a, the thickness of the material 14a needs to be made uniform on the surface of the lens portion 1la. Therefore, the viscosity of the material 14a is preferably in the range of 0.1 lPa-s to 100 Pa-s.
- the extra material 14a can be stored in the groove 13. Therefore, in the method of the present invention, the outer edge portion of the lens portion 11a does not need to have a shape different from the shape desirable for the lens. Therefore, it is possible to make the entire lens unit 11a function effectively as a lens.
- the coating layer 14 having a small thickness variation can be formed on the entire lens portion 11a. As a result, a lens having excellent optical characteristics, for example, a lens with small optical aberration can be obtained.
- the lens 100 can be accurately mounted on the device using the second region 12 as a reference surface.
- FIG. 5A shows a top view of the lens of Embodiment 2
- FIG. 5B shows a cross-sectional view taken along spring VB-VB in FIG. 5A
- a lens 100a shown in FIGS. 5A and 5B includes a lens substrate 20 and a coat layer 14 formed on the lens substrate 20.
- a top view of the lens substrate 20 is shown in FIG. 5C.
- the lens substrate 20 includes a first region 11 including a convex lens portion 21a and a second region 12 surrounding the first region 11.
- the entire first region 11 is the lens portion 21. It is a.
- the lens unit 21a is a diffractive lens.
- the lens portion 21a is formed by providing a step called a blaze on a lens convex surface based on a specific spherical coefficient or aspheric coefficient.
- the lens portion 21a having such a shape is a diffractive lens using a diffraction phenomenon.
- a groove 13 is formed between the first region 11 and the second region 12.
- the groove 13 is formed in an annular shape so as to surround the lens portion 21a.
- the center of the planar shape of the groove 13 coincides with the center of the planar shape of the lens portion 21a.
- the coat layer 14 is formed on the entire surface of the lens portion 21a (first region 11) and part of the groove 13. The coat layer 14 is not formed on the second region 12.
- the groove 13 is formed so as to be adjacent to the outer edge of the lens portion 21a. According to this configuration, when forming the coat layer 14, it is possible to store excess material present in the outer edge portion of the lens portion 21 a in the groove 13. Therefore, it is possible to particularly increase the thickness uniformity of the coat layer 14. In addition, the coat layer 14 having a small thickness variation can be formed on the entire surface of the lens portion 21a. As a result, a lens having excellent optical characteristics, for example, a lens with small optical aberration can be obtained. Further, the groove 13 can suppress the formation of the coat layer 14 in the second region 12. Therefore, it is possible to accurately mount the lens 100a on the device using the second region 12 as a reference plane.
- the lens portion 21a which is a diffractive lens. Therefore, when the coating layer 14 is formed by the spin coating method, the material 14a of the coating layer 14 disposed on the top of the lens portion 21a tends not to flow downward. In this case, the material 14a diluted with a solvent to reduce the viscosity may be used. However, in order to form the coat layer 14 having a predetermined thickness, it is necessary to apply a large amount of the material 14a. In the absence of the groove 13, the material 14a spreads over the second region 12 and cannot be used as a reference surface for mounting. On the other hand, according to the present invention, the formation of the coat layer 14 in the second region 12 can be suppressed by the groove 13. Therefore, the present invention is particularly effective when the lens portion is a diffractive lens. Similarly, the present invention is also effective when a coat layer is formed on the surface of a diffractive lens using a screen printing method or a pad printing method.
- the coating layer of the diffractive lens there is a refractive index adjusting film for correcting chromatic aberration of the camera. It ’s known! By forming a coating layer having a refractive index dispersion on the diffractive lens that cancels the wavelength dispersion of the refractive index of the lens base material, a high diffraction efficiency can be obtained over a wide band. Therefore, chromatic aberration can be reduced by incorporating a diffractive lens having a refractive index adjusting film in the camera module.
- the blaze step d where the first-order diffraction efficiency at the wavelength of the lens with the coating layer is 100%, is a female equation, where n is the refractive index of the diffraction lens and n is the refractive index of the coating layer 1] Given in.
- the refractive index adjusting film (coat layer) is formed on the diffractive lens by the method of the present invention, chromatic aberration can be reduced and optical aberration caused by variation in the thickness of the coat layer can also be reduced.
- FIG. 6A A top view of the lens of Embodiment 3 is shown in FIG. 6A, and a cross-sectional view taken along spring VIB-VIB in FIG. 6A is shown in FIG. 6B.
- a lens 100b shown in FIGS. 6A and 6B includes a lens base 30 and a coat layer 14 formed on the lens base 30.
- the lens substrate 30 includes two first regions 11 including the convex lens portion 11a and a second region 12 surrounding the first region 11.
- the entire first region 11 is the lens portion 11a.
- a groove 13 is formed between the first region 11 and the second region 12.
- the coat layer 14 is formed on the entire surface of the lens portion 11a (first region 11) and part of the groove 13. The coat layer 14 is not formed on the second region 12.
- the lens 100b includes two lens portions 11a formed on the same surface of one lens substrate 30.
- the lens 100b can function as a compound eye lens.
- the distance to the subject can be measured.
- the accuracy of the reference surface is low, an inclination occurs between the compound eye lens and the imaging surface. This slope is not accurate for distance measurement. Become a factor.
- the first region 11 and the groove 13 each have the same configuration as that of the lens 100 of the first embodiment. Therefore, in the lens 100b, as in the lens 100, the entire lens unit 11a can be used efficiently. In addition, since the coat layer 14 is not formed in the second region 12, the second region 12 can be used as a reference surface when the lens 100b is incorporated in the camera module.
- the coating layer 14 is formed on the lens portion 11a by the spin coating method, the material 14a of the coating layer 14 is spread to the second region 12 without the grooves 13. As a result, the material 14a dropped on each lens portion 11a interferes. As a result, it becomes difficult to form the coating layer 14 having a small thickness variation on each lens portion 11a.
- the groove 13 is formed in the lens 100b of the third embodiment, it is possible to suppress the interference of the material 14a dropped on each lens portion 11a. As a result, it is possible to form the coat layer 14 having a small thickness variation in all the lens portions 11a.
- the second region 12 can be used as a reference surface when the lens 100b is incorporated into the camera module. Therefore, when the lens 100b is used for distance measurement, the distance can be measured accurately.
- the coating layer 14 is usually formed by the following method. First, the material 14a of the coating layer 14 is dropped on the first lens portion 11a, and the material 14a is applied onto the first lens portion 11a by rotating the lens base 30 around the first lens portion 11a. . Next, the material 14a is dropped onto the second lens portion 11a, and the material 14a is applied onto the second lens portion 11a by rotating the lens substrate 30 around the second lens portion 11a. Similarly, when three or more lens parts are formed on one lens substrate, the spin coat method is performed for each lens part. By such a method, the coating layer 14 having a small thickness variation can be formed on each lens portion 11a.
- the present invention is particularly effective when a coating layer is formed on each lens portion of a compound eye lens.
- the screen printing method or the pad printing method is used as in the first embodiment. It may be used to form a coat layer.
- the present invention is also effective when a screen printing method or a pad printing method is used.
- the grooves 13 are formed around all the lens portions 11a has been described. However, when the lens portions that do not require the coat layer are included in the plurality of lens portions, the grooves 13 may not be formed around the lens portions.
- Embodiment 3 the force described in the case where the lens portion 11a has an aspherical shape can be obtained even if the shape is a spherical shape or a diffractive lens.
- the groove 13 is formed in an annular shape so as to surround the entire outer edge portion of the lens portion 11a (first region 11).
- the groove 13 does not necessarily have to be completely annular. Even if there is a part that is not connected to a part, the effect of the present invention can be obtained if the width of the cut part is narrow.
- the cross section of the groove 13 may not be rectangular, for example, may be U-shaped or V-shaped.
- the first region 11 may include a portion that is disposed around the lens portion 11a and does not function as a lens.
- the lens portion is formed only on one side of the lens substrate.
- the effect of the present invention can be obtained.
- the lens substrate made of synthetic resin was formed by injection molding.
- the lens base material which consists of glass was formed by press molding.
- Example 1 an example in which the lens 100 shown in FIGS. 1A and 1B is manufactured will be described.
- a lens substrate 10 made of polycarbonate (Teijin Chemicals: AD-5503) was used.
- the planar shape of the lens substrate 10 was 4 mm square.
- the lens portion 1 la (first region 11) was disposed at the center of the lens substrate 10.
- the diameter of the lens part 11a was 1.2 mm, and the thickness from the bottom surface of the lens substrate 10 to the top part of the lens part 11a was 0.8 mm.
- the thickness of the second region was 0.6 mm.
- the width of the groove 13 was 0.2 mm, and the depth of the groove 13 was 0.2 mm.
- a material 14a for the coating layer 14 is prepared by combining a photopolymerization initiator with an acrylic oligomer (Nippon Synthetic Chemicals: UV-7000B) and diluting them with propylene glycol monomethyl ether. did.
- the viscosity of the material 14a was 0.1 lPa's.
- the lens substrate 10 was set in the spin coat apparatus so that the center of the lens portion 11a coincided with the rotation center in the spin coat. And the material 14a was dripped at the top part of the lens part 11a, and the spin coat process for 10 second was performed at 2000 rpm. Next, the solvent in the material 14a was volatilized by performing a vacuum treatment at room temperature for 10 minutes. Next, the material 14a was cured by UV irradiation. In this way, a lens 100 shown in FIGS. 1A and 1B was obtained.
- a lens similar to the lens 100 was manufactured as the lens 1 of Comparative Example 1 except that the groove 13 was not formed.
- the lens 1 produced in Comparative Example 1 is shown in the top view of FIG. 7A and the cross-sectional view of FIG. 7B.
- the lens substrate la of the lens 1 has the same structure as the lens substrate 10 of Example 1 except that there is no groove 13.
- a coating layer 14 was formed on the lens portion 11a of the lens substrate la by the same material and method as in Example 1.
- the thickness of the coating layer in the lens portion was It was measured.
- the thickness of the coat layer was measured using a laser reflection type shape measuring device. Specifically, the shape before and after the formation of the coat layer was measured in an arbitrary cross section. From this measured value, as shown in FIG. 8, the thickness of the coat layer 14 (t, t, t, etc. in FIG. 8) at a position where the distance from the center of the lens is different was obtained. As shown in Fig. 8, the optical axis of the lens is flat.
- the thickness in the running direction was taken as the thickness of the coat layer.
- Figure 9 shows the measurement results.
- the thickness of the coat layer 14 tended to monotonously increase as the distance from the center of the lens portion 11a increased.
- the rate of increase tends to increase at the outer edge of the lens portion 11a (the distance from the center of the lens portion 11a is around ⁇ 0.6 mm).
- the thickness of the coat layer 14 hardly changed even in the portion away from the center of the lens portion 11a, and was almost uniform over the entire area of the lens portion 11a. . That is, in the lens 100, the surface shape of the coating layer 14 substantially coincided with the aspherical shape of the lens portion 11a.
- Example 2 another example of manufacturing the lens 100 shown in FIGS. 1A and 1B will be described.
- a lens substrate 10 made of optical glass (Sumita Optical Glass Co., Ltd .: K LaKnl4) was used.
- a coating layer 14 was formed on the lens base material 10 using the same material and method as in Example 1 to obtain a lens 100.
- a lens similar to the lens of Example 2 was produced as the lens of Comparative Example 2 except that the groove 13 was not formed.
- the thickness of the coat layer was measured. Measurement The result is shown in FIG.
- the thickness of the coat layer was determined in the same manner as in Example 1.
- the thickness of the coat layer tended to increase monotonically as the distance from the center of the lens portion 11a was increased.
- the thickness of the coat layer hardly changed even in the part away from the center of the lens part 11a, and was almost uniform over the entire area of the lens part 11a.
- Example 3 an example in which the lens 100a shown in FIGS. 5A and 5B is manufactured will be described.
- the planar shape of the lens substrate 20 was 4 mm square.
- the lens portion 21 a (first region 11) is disposed at the center of the lens base material 20.
- the diameter of the lens portion 21a was 1.2 mm, and the thickness from the bottom surface of the lens substrate 20 to the top portion of the lens portion 21a was 0.8 mm.
- the thickness of the second region 12 was 0.6 mm.
- the blaze difference was 15.5 111. ? ⁇
- the width of 13 is 0.2 mm.
- the depth of ⁇ 13 was 0.2 mm.
- a diffractive lens with small chromatic aberration can be realized by appropriately designing the combination of the lens base material and the coating layer material and the level difference of the blaze. Furthermore, the lens function can be improved by matching the surface shape of the coat layer with the shape of the surface connecting the lower surfaces of the steps of the diffractive lens.
- Comparative Example 3 a lens 3 shown in the top view of FIG. 11A and the cross-sectional view of FIG. 11B was produced.
- the lens substrate 3a was used.
- the lens base material 3a is the same as the lens base material 20 of Example 3 except that the groove 13 is not provided.
- a coating layer 14 was formed on the lens base material 3a, and a lens 3 of Comparative Example 3 was obtained.
- the thickness of the coat layer 14 in the lens portion was measured. Specifically, first, the surface shape before and after forming the coat layer in an arbitrary cross section was measured using a laser reflection type shape measuring device. Then, an aspherical curve 121 (dotted line in FIG. 12) connecting the lower surfaces of the blaze steps was obtained from the measurement before forming the coat layer. Then, as shown in FIG. 12, the distance from the aspherical curve 121 to the surface of the coat layer 14 was obtained and used as the thickness of the coat layer 14. Figure 13 shows the measurement results.
- the thickness of the coat layer tended to monotonously increase as the distance from the center of the lens portion increased.
- the rate of increase tended to increase at the outer edge of the lens part (distance from the center of the lens part: around ⁇ 0.6 mm).
- the thickness of the coat layer hardly changed even when it was away from the center of the lens part, and was almost uniform over the entire area of the lens part.
- the surface shape of the coat layer of Example 3 substantially coincided with the aspheric shape connecting the lower surfaces of the blaze steps of the diffractive lens.
- Example 4 another example in which the lens 100a shown in FIGS. 5A and 5B is manufactured will be described.
- a lens substrate 20 made of optical glass (Sumita Optical Glass Co., Ltd .: K—LaKnl4, d-line refractive index 1.74, Abbe number 53) was used.
- the planar shape of the lens substrate 20 was 4 mm square.
- the diameter of the lens portion 21a was 1.2 mm, and the thickness from the bottom surface of the lens base material to the top of the lens portion 21a was 0.8 mm.
- the thickness of the second region 12 was 0.6 mm.
- the blaze step was 4.7 m.
- the width of groove 13 is 0.2 mm.
- the depth of ⁇ 13 was 0.2 mm.
- Comparative Example 4 a lens was produced using the same material and method as the lens 100a of Example 4 except that the lens substrate did not have the groove 13.
- the thickness of the coat layer tended to increase monotonically as the distance from the center of the lens portion increased.
- the thickness of the coat layer hardly changed even when it was away from the center of the lens part, and was almost uniform over the entire area of the lens part.
- the surface shape of the coat layer almost coincided with the aspheric shape connecting the lower surfaces of the blazed steps of the diffractive lens.
- Example 5 an example in which the lens 100b shown in FIGS. 6A and 6B is manufactured will be described.
- a lens substrate 30 made of polycarbonate (Teijin Chemicals: AD-5503) was used.
- the planar shape of the lens substrate 30 was 5 mm square.
- the lens portion 1 la (first region 11) was disposed near the center of the lens substrate 30.
- the diameter of the lens part 11a was 1.2 mm.
- the thickness from the bottom surface of the lens base 30 to the top of the lens portion 11a was set to 0.8 mm.
- the thickness of the second region 12 was 0.6 mm.
- the width of groove 13 is 0.2 mm.
- the depth of ⁇ 13 was 0.2 mm.
- the distance between the two lens portions 11a was 1.0 mm.
- Example 5 The same solution as in Example 1 was prepared as the coating layer material 14a.
- the lens substrate 30 was set in a spin coater so that the center of one lens portion 1 la coincided with the rotation center.
- the material 14a was dropped on the top of the one lens part 11a, and spin coating was performed for 10 seconds at a rotational speed of 2000 rpm.
- the lens substrate 30 was set in a spin coater so that the center of the other lens portion 11a coincided with the rotation center.
- the material 14a was dropped on the other lens portion 11a, and spin coating was performed at a rotational speed of 2000 rpm for 10 seconds.
- the solvent in the material 14a was volatilized by performing a vacuum treatment at room temperature for 10 minutes.
- material 14a was cured by UV irradiation. In this way, the lens of Example 5 was obtained.
- a lens was produced using the same material and method as the lens 100b of Example 5 except that the lens substrate did not have the groove 13.
- the thickness of the coating layer on the lens portion was measured.
- the thickness is the same as in Example 1 on the line connecting the centers of the two lens parts. It measured by the method of.
- FIG. 15 shows the measurement result of the lens of Example 5
- FIG. 16 shows the measurement result of the lens of Comparative Example 5.
- the thickness of the coat layer tended to increase monotonically as the central force of the lens portion was also increased. In particular, it was close to the adjacent lens part, and the thickness fluctuated greatly.
- the thickness of the coat layer hardly changed even when it was away from the center of the lens part, and was almost uniform over the entire lens part. It was one. Further, in the portion close to the adjacent lens portion, the variation in the thickness of the coat layer was suppressed as compared with the lens of Comparative Example 5. Further, in the lens of Comparative Example 5, the coat layer was formed in the second region, whereas in the lens of Example 5, the coat layer was not formed in the second region.
- Example 6 a lens in which two diffractive lenses were formed on one lens substrate was produced.
- a lens made of polycarbonate (Teijin Chemicals Limited: AD-5503, d-line refractive index 1.59, Abbe number 28)
- a substrate 170 was prepared.
- the lens base 170 includes two lens portions 2 la arranged on the same plane.
- the lens unit 21a is a diffractive lens.
- the entire first region 11 is the lens portion 21a.
- the lens substrate 170 includes two first regions 11 and a second region 12 disposed around the first regions 11. A groove 13 is formed between the first region 11 and the second region 12.
- the planar shape of the lens substrate 170 was 5 mm square.
- the shape of the lens portion 21a and the groove 13 was the same as the shape of the lens portion and the groove of the lens of Example 3.
- the distance between the two lens parts 21a was 1. Omm.
- a coating layer was formed on the lens substrate 170 using the same methods and materials as in Example 3 to obtain the lens of Example 6.
- a lens was produced by the same material and method as the lens of Example 6 except that the lens substrate did not have grooves 13.
- the thickness of the coating layer in the lens portion was measured. The thickness was measured in the same manner as in Example 3 on the line connecting the centers of the two lens parts. The measurement result of the lens of Example 6 is shown in FIG. 18, and the measurement result of the lens of Comparative Example 6 is shown in FIG.
- the thickness of the coat layer tended to increase monotonically as the central force of the lens portion was also increased. In particular, it was close to the adjacent lens part, and the thickness fluctuated greatly.
- the thickness of the coat layer hardly changed even when it was away from the center of the lens part, and almost throughout the entire lens part. It was uniform. Also, in the portion close to the adjacent lens portion, the variation in the thickness of the coat layer of Example 6 was suppressed as compared with the lens of Comparative Example 6. In the lens of Comparative Example 6, a coat layer was formed in the second region, whereas in the lens of Example 6, no coat layer was formed in the second region.
- Example 7 an example in which the lens 100a shown in FIGS. 5A and 5B is manufactured using a screen printing method will be described.
- Example 7 the lens substrate used in Example 3 was used as the lens substrate. Further, as the material for the coat layer, a coating solution having the same composition as the material for the coat layer used in Example 3 and having only a different viscosity was used. Specifically, in Example 7, the viscosity of the material of the coat layer was set to 5 Pa ′s.
- the material of the coat layer was applied to the lens portion by screen printing.
- a screen plate made of Tetron and having an emulsion thickness of 20 m and a transmission part diameter of 1.5 mm was used as the screen plate.
- the solvent in the coating layer material was volatilized by performing a vacuum treatment at room temperature for 10 minutes.
- the material of the coat layer was cured by performing UV irradiation.
- the lens of Example 7 was obtained by repeating the above screen printing, volatilization treatment, and UV irradiation treatment steps twice.
- Comparative Example 7 the same material as the lens of Example 7 except that the lens base material does not have grooves 13. Lenses were produced using materials and methods.
- the thickness of the coat layer tended to increase monotonically as the central force of the lens portion was also increased.
- variation in the thickness of the coat layer was suppressed.
- Example 8 an example in which the lens 100a shown in FIGS. 5A and 5B is manufactured using the pad printing method will be described.
- Example 8 the lens substrate used in Example 7 was used as the lens substrate. Further, the material for the coat layer used in Example 7 was prepared as the material for the coat layer. Next, a steel plate having a recess having a depth of 25 m and a diameter of 1.5 mm was prepared as a printing plate. The material of the coating layer disposed in the concave portion of the steel plate was applied to the lens portion by the pad printing method. Next, the solvent in the coating layer material was volatilized by performing a vacuum treatment at room temperature for 10 minutes. Next, the material of the coat layer was cured by performing UV irradiation. The lens of Example 8 was obtained by repeating the above pad printing, volatilization treatment, and UV irradiation treatment steps three times.
- Comparative Example 8 a lens was produced with the same material and method as the lens of Example 8, except that the lens substrate did not have grooves 13.
- the thickness of the coat layer tended to increase monotonically as the central force of the lens portion was also increased.
- variation in the thickness of the coat layer was suppressed.
- a coat layer was formed in the second region. It can be considered that this is because the material force of the coat layer applied to the lens portion has flowed down to the second region.
- no coat layer was formed in the second region.
- the shape of the groove 13 was the same.
- the shape of the groove 13 is not limited to the above-described shape as long as it does not have an optical influence.
- the shape of the groove 13 is determined in consideration of the physical properties (mainly viscosity and surface tension) of the coating layer material and the coating amount of the coating layer material.
- a coating material containing a solvent was used as a material for the coating layer.
- the material of the coating layer may not contain a solvent as long as the viscosity is appropriate for the coating method used, and in this case, the effect of the present invention can be obtained.
- the lens of the present invention can be used in various optical devices and electronic devices including the lens.
- the lens of the present invention can be used for a camera module mounted on a mobile phone or a car.
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- Engineering & Computer Science (AREA)
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Ophthalmology & Optometry (AREA)
- Surface Treatment Of Optical Elements (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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JP2008549321A JP4286905B2 (ja) | 2006-12-14 | 2007-12-11 | レンズおよびその製造方法 |
US12/516,039 US20100027121A1 (en) | 2006-12-14 | 2007-12-11 | Lens and method for manufacturing the same |
CN2007800461491A CN101558331B (zh) | 2006-12-14 | 2007-12-11 | 透镜及其制造方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2006-336819 | 2006-12-14 | ||
JP2006336819 | 2006-12-14 |
Publications (1)
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WO2008072633A1 true WO2008072633A1 (ja) | 2008-06-19 |
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ID=39511654
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2007/073874 WO2008072633A1 (ja) | 2006-12-14 | 2007-12-11 | レンズおよびその製造方法 |
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US (1) | US20100027121A1 (ja) |
JP (1) | JP4286905B2 (ja) |
CN (1) | CN101558331B (ja) |
WO (1) | WO2008072633A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010066680A (ja) * | 2008-09-12 | 2010-03-25 | Canon Inc | 光学素子及びそれを有する光学系 |
JP2010161180A (ja) * | 2009-01-07 | 2010-07-22 | Sony Corp | 固体撮像装置及びその製造方法、カメラ |
JP2012220705A (ja) * | 2011-04-08 | 2012-11-12 | Panasonic Corp | 回折光学素子およびその製造方法 |
JP5996440B2 (ja) * | 2011-02-08 | 2016-09-21 | 浜松ホトニクス株式会社 | 光学素子及びその製造方法 |
Families Citing this family (10)
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US8529991B2 (en) * | 2009-07-31 | 2013-09-10 | Raytheon Canada Limited | Method and apparatus for cutting a part without damaging a coating thereon |
US8527497B2 (en) * | 2010-12-30 | 2013-09-03 | Facebook, Inc. | Composite term index for graph data |
CA2844807C (en) * | 2011-08-19 | 2022-07-26 | Hospira, Inc. | Systems and methods for a graphical interface including a graphical representation of medical data |
EP2762261A1 (de) * | 2013-02-01 | 2014-08-06 | Bystronic Laser AG | Schneidoptik für eine Laserschneidanlage, mit Korrektur oder gezielten Beeinflussung der chromatischen Aberration ; Laserschneidanlage mit solcher Optik |
KR102201453B1 (ko) * | 2014-09-04 | 2021-01-12 | 현대모비스 주식회사 | 차량용 램프 렌즈 제조방법 |
KR102297128B1 (ko) * | 2014-09-22 | 2021-09-02 | 현대모비스 주식회사 | 색수차가 저감된 램프 렌즈 및 이를 이용한 차량용 램프 |
US9952415B2 (en) * | 2015-04-22 | 2018-04-24 | Omnivision Technologies, Inc. | Trenched-substrate based lens manufacturing methods, and associated systems |
DE102015116402A1 (de) | 2015-09-28 | 2017-03-30 | Carl Zeiss Smart Optics Gmbh | Optisches Bauteil und Verfahren zu seiner Herstellung |
CN108037548A (zh) * | 2017-12-08 | 2018-05-15 | 江苏黄金屋光学眼镜股份有限公司 | 一种资源利用率高的树脂镀膜镜片 |
EP3976381A1 (en) * | 2019-05-28 | 2022-04-06 | Alcon Inc. | Pad transfer printing instrument and method for making colored contact lenses |
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JP2002261261A (ja) * | 2001-02-28 | 2002-09-13 | Toppan Printing Co Ltd | 撮像素子及びその製造方法 |
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US5619488A (en) * | 1991-09-07 | 1997-04-08 | Fuji Xerox Co., Ltd. | Information recording device |
US20020149717A1 (en) * | 1997-01-29 | 2002-10-17 | Borrelli Nicholas F. | Lens array on LCD panel and method |
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US6916503B2 (en) * | 2001-09-06 | 2005-07-12 | Konica Corporation | Base material to be coated, coating apparatus, coating method and element producing method |
JP4391801B2 (ja) * | 2003-11-10 | 2009-12-24 | Hoya株式会社 | 保護フィルム付き光学レンズ基材および光学レンズ基材の製造方法 |
US7270929B2 (en) * | 2005-02-24 | 2007-09-18 | Hewlett-Packard Development Company, L.P. | Media for laser imaging |
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2007
- 2007-12-11 JP JP2008549321A patent/JP4286905B2/ja not_active Expired - Fee Related
- 2007-12-11 CN CN2007800461491A patent/CN101558331B/zh not_active Expired - Fee Related
- 2007-12-11 WO PCT/JP2007/073874 patent/WO2008072633A1/ja active Search and Examination
- 2007-12-11 US US12/516,039 patent/US20100027121A1/en not_active Abandoned
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JP2002261261A (ja) * | 2001-02-28 | 2002-09-13 | Toppan Printing Co Ltd | 撮像素子及びその製造方法 |
JP2002280534A (ja) * | 2001-03-16 | 2002-09-27 | Toppan Printing Co Ltd | 固体撮像素子及びその製造方法 |
JP2004163490A (ja) * | 2002-11-11 | 2004-06-10 | Nippon Sheet Glass Co Ltd | 光学素子及びその製造方法 |
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JP2010066680A (ja) * | 2008-09-12 | 2010-03-25 | Canon Inc | 光学素子及びそれを有する光学系 |
JP2010161180A (ja) * | 2009-01-07 | 2010-07-22 | Sony Corp | 固体撮像装置及びその製造方法、カメラ |
JP5996440B2 (ja) * | 2011-02-08 | 2016-09-21 | 浜松ホトニクス株式会社 | 光学素子及びその製造方法 |
JP2012220705A (ja) * | 2011-04-08 | 2012-11-12 | Panasonic Corp | 回折光学素子およびその製造方法 |
Also Published As
Publication number | Publication date |
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JP4286905B2 (ja) | 2009-07-01 |
US20100027121A1 (en) | 2010-02-04 |
CN101558331B (zh) | 2011-07-27 |
CN101558331A (zh) | 2009-10-14 |
JPWO2008072633A1 (ja) | 2010-04-02 |
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