CN102834240A - Molding die, injection molding machine, and method of manufacturing objective optical element - Google Patents
Molding die, injection molding machine, and method of manufacturing objective optical element Download PDFInfo
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- CN102834240A CN102834240A CN2011800171495A CN201180017149A CN102834240A CN 102834240 A CN102834240 A CN 102834240A CN 2011800171495 A CN2011800171495 A CN 2011800171495A CN 201180017149 A CN201180017149 A CN 201180017149A CN 102834240 A CN102834240 A CN 102834240A
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- optical element
- core
- template
- information recording
- object optical
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Classifications
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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
- 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
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- 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
- B29D11/00009—Production of simple or compound lenses
- B29D11/0048—Moulds for lenses
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1372—Lenses
- G11B7/1374—Objective lenses
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/22—Apparatus or processes for the manufacture of optical heads, e.g. assembly
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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
- 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
- B29C45/2673—Moulds with exchangeable mould parts, e.g. cassette moulds
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- 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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Optical Head (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Disclosed are a molding die, an injection molding machine, and a method of manufacturing an objective optical element, which reduce coma aberration due to lens axis displacement and provide high workability and high production efficiency. Specifically disclosed is an injection molding die for manufacturing an objective optical element for an optical pickup device having an NA value of 0.70-0.95, said molding die comprising a first die plate, a first core, a second die plate, and a second core, wherein the first die plate has a first core support hole and the second die plate has a second core support hole, wherein the second die plate is stacked on top of the first die plate in the direction of gravitational force, wherein the first core has a first optical transfer surface for forming a first optical surface of the objective optical element and holds the objective optical element when the die is opened, wherein the second core has a second optical transfer surface for forming a second optical surface of the objective optical element and does not hold the objective optical element when the die is opened, and wherein the absolute value of the radius of curvature of the first optical transfer surface is smaller than the absolute value of the radius of curvature of the second optical transfer surface.
Description
Technical field
The present invention relates to the manufacturing approach of mould, injection (mo(u)lding) machine and object optical element.
Background technology
As the mould of moulding plastics lens, put down in writing in the mould of patent documentation 1 record to establish and cut apart structure at core.This core is the structure that is divided into the core (the 2nd core) that forms the main forming surface of moulding article and is configured in the main forming surface of the formation core (the 1st core) in addition of the 2nd core periphery.
The mould of record wherein is to be contained in the template being provided with this core of cutting apart structure in the patent documentation 1, at this moment, is not only between the 1st core and the template, also produces the slit between the 1st core and the 2nd core.
Apertured words, core just have the leeway of displacement, inclination in the scope in slit.The displacement here is meant the displacement of the desirable optical axis vertical direction of mould, and inclination is the inclination of relative ideal optical axis.The core that this inclination and displacement will cause constituting 2 optical function faces of lens departs from.And this core to depart from be the main generation reason that causes the coma aberration of deterioration in optical properties.
The look-ahead technique document
Patent documentation
Patent documentation 1: the spy opens flat 10-128803 communique
Summary of the invention
The problem that the invention desire solves
Therefore, as establishing in the mould of cutting apart structure at core of record in the patent documentation 1, because the slit number between core and template is many, so cause that easily core departs from, like this, the generating capacity of coma aberration is many, and optical characteristics can worsen, existing problems.
During the situation of the object lens that use in the optical take-up apparatus; The words that the coma aberration generating capacity is big; The spot shape that shines the laser on the CD signal face can change, so, the regeneration action of the signal that can not correctly carry out writing down on the CD and to the operation of recording of the signal of CD.Therefore, during the object lens that use in the moulding optical take-up apparatus, the generation that the core of lens departs from the coma aberration that causes especially becomes a big problem.
In recent years, high recording capacity CD and the optical take-up apparatus that use this CD of the NA value of near the bluish violet color laser using 400nm, object lens the Blu-ray Disc (BD) of 0.85 degree practicability.The object lens that use during to the record of the high recording capacity CD of this use bluish violet color laser or regeneration, need than with CD, the higher NA value of object lens that DVD is corresponding.The NA value is high more, and the generating capacity that core departs from the coma aberration that causes is big more, moreover when BD uses object lens, compares with object lens with CD, DVD, and the permissible range of coma aberration is little.Therefore, when moulding BD uses object lens, especially must reduce the generation that the lens core departs from the coma aberration that causes.
In addition, establish when cutting apart structure at core as patent documentation 1 is said, components number also increases.Therefore, the assembling operation of core and the adjustment of mould cost time, also produce the problem of operation property deterioration.
Application of the present invention is in view of the above-mentioned problem points of technology in the past.Purpose is to provide a kind of manufacturing approach that the lens core departs from good mould, injection (mo(u)lding) machine and object optical element of generation and the operation property of the coma aberration that causes that reduces.
With the means that solve problem
The mould of the 1st record; Be to make the mould that the NA value is used in the injection moulding of the objective optical element for optical pickup device below 0.95 more than 0.70; It is characterized in that; Said mould has the 1st template, the 1st core, the 2nd template, the 2nd core; Said the 1st template has the 1st core support cave that is used for installing said the 1st core, and said the 2nd template has the 2nd core support cave that is used for installing said the 2nd core, and said the 2nd template of said relatively the 1st template is configured in the above-below direction of gravity direction by coincidence; Said the 1st core has the 1st optics transfer surface of the 1st optical surface that is used for forming said object optical element; When said the 1st template and said the 2nd template die sinking, support said object optical element, said the 2nd core has the 2nd optics transfer surface of the 2nd optical surface that is used for forming said object optical element, when said the 1st template and said the 2nd template die sinking, does not support said object optical element; The absolute value of the radius of curvature of said the 1st optics transfer surface is less than the absolute value of the radius of curvature of said the 2nd optics transfer surface.
According to the present invention, the 1st template has the 1st core support cave that is used for installing the 1st core, and the 2nd template has the core support cave that is used for installing the 2nd core.That is to say that core is not established and cut apart structure, is to make core be directly installed on the structure on the template.Therefore, have only between core and the template to produce the slit, so, the slit number can be reduced.Thus, can reduce the amount of core inclination and displacement, so the core that can reduce between 2 optical function faces that constitute lens departs from, the result can reduce the generation of coma aberration.
At this, have as horizontal type make-up machine in the situation that disposes 2 templates perpendicular to the direction of gravity direction.At this moment, because the influence of gravity, template and template are lacked of proper care in the depth of parallelism of above-below direction easily.Therefore, the core and the depth of parallelism of core that are installed on each template also will be lacked of proper care, so, cause that easily core departs from.Especially core is not established and is cut apart structure, core directly is contained in the situation on the template; Though can omit the assembling operation of core; But opposite, because be the structure of coming the inching core through assembling can not be when cutting apart structure, so; Core is not established when cutting apart structure, and the depth of parallelism that obtains template in advance is even more important.For the depth of parallelism problem of above-mentioned template, among the present invention, relative the 1st template the 2nd template is configured in the above-below direction of gravity direction by coincidence.Like this, the gravity that acts on the 1st template, the 2nd template is even, can access the depth of parallelism of the 1st template and the 2nd template.Therefore, also can access the 1st core that is contained on each template, the depth of parallelism of the 2nd core, can reduce core and depart from, can reduce the generation of coma aberration.
In addition, in general, when the above-below direction of gravity direction overlaps 2 templates of configuration; Be contained in the core on the template of gravity direction top, because gravity receives downward active force; When so core is installed, operating personnel must the limit seeing template below, carefully hold core with a hand; Avoid falling and damage, by another manual tool tighten core be fixed to screw rod template and other parts on one side.Therefore, when core has the structure that as cutting apart structure, must assemble, possibly produce core is installed to the problem that the operation property on the template becomes poorer.In addition, when having formed the transfer surface of object optical element etc. on the core, operating personnel might not inadvertently touch, and cause transfer surface to pollute, and so also must clean and wait Appendage Task.Relevant these problems are established at core and to be cut apart when structure, must the assembling cores, and the worry of touching transfer surface in the assembling process is big, possibly further cause the deterioration of operation property.
The problem of relevant above-mentioned operation property, among the present invention, because be that core is not established and cut apart structure, core is directly installed to the structure of template, so, even overlap the situation of 2 templates of configuration, also can make the raising of operation property at the above-below direction of gravity direction.
In addition, as one of method of molded lens, compression forming is arranged.During compression forming, drop into the material of metering between 2 of fixed temperature templates being heated to, treat that closing 2 templates after the material band flowability pressurizes, and carries out moulding thus.But during compression molding, because be that the locking of 2 templates is carried out on extrded material limit, limit, so, produce the problem that core departs from that takes place easily.For this type problem, the present invention carries out moulding through injection moulding, at the state of 2 templates of locking, promptly aim at the following input material resin of state of the core of core in advance, can reduce the generation that core departs from so compare with compression forming.
In addition, during with the injection moulding molding thermoplastic resin, compare with the situation of compression forming, well production efficiency can be produced in a large number.
As stated,, can reduce core and depart from, can reduce the generation of coma aberration according to the present invention.Therefore, when the generation that departs from the coma aberration that causes at the molded lens core especially becomes the object lens that use in the optical take-up apparatus of problem, also can moulding can access the object lens of good optical characteristic.Especially take place greatly easily because of the NA value that core departs from and when the little BD of permissible range that CD, DVD compare coma aberration with object lens uses object lens in moulding, also can moulding can access the object lens of good optical characteristic.And according to the present invention, the operation property raising in the time of can making moulding can make production efficiency improve.
In this specification; Said the 2nd template of so-called said relatively the 1st template is configured in the above-below direction of gravity direction by coincidence; Can be that relative the 1st template the 2nd template is configured in gravity direction top one side, also can be that relative the 1st template the 2nd template is configured in gravity direction below one side.In addition, preferred template is installed on up and down either party parts such as installing plate, receiving plate that are configured in this template gravity direction.And preferred template has the core support cave more than at least 2 that is used for installing core.
The mould of the 2nd record is the mould of record in the 1st, it is characterized in that, said the 2nd template of said relatively the 1st template is configured in gravity direction top one side.
During moulding, when chamber filling molten resin, molten resin receives the gravity effect, so, with gravity towards comparing, towards reverse resin fill difficulty, the result during moulding, the residual bubble of air possibly occur in the chamber to gravity.When especially that the radius of curvature absolute value is a little optics transfer surface is configured in gravity direction top one side, promptly when the little optics transfer surface of gravity direction reverse configuration radius of curvature absolute value, maybe above-mentioned air bubble problem especially remarkable.For this problem, among the present invention be relative the 1st template with the 2nd template configuration side above gravity direction, be about to a little side the 1st optics transfer surface of absolute value of radius of curvature, be configured in a side below the gravity direction.Separate thus that air remains in the bubble in the chamber when disappearing moulding, can improve transfer printing property.And, when the 1st optics transfer surface has fine step shape such as diffraction structure, through the 1st optics transfer surface being configured in gravity direction below one side; During moulding, molten resin also gets into the fine step shape that forms diffraction structure owing to deadweight, so; Can separate the bubble of cooling down, improve transfer printing property.
The mould of the 3rd record is the mould of record in the 1st or the 2nd, it is characterized in that at least a portion of said the 1st optics transfer surface has the optical path difference that is made up of a plurality of steps and pays structure.
At least a portion of the 1st optics transfer surface has the optical path difference that is made up of a plurality of steps to be paid structure, is at least a portion of optical surface of the object optical element of moulding when having the optical path difference that is made up of a plurality of steps and paying structure, and the core that must more reduce the optics of lens face when not having optical path difference to pay structure departs from.According to the present invention, because can make the core of optics of lens face depart from reduction, so, have optical path difference on the optical surface and pay when structure, also can moulding can access the object optical element of good optical characteristic.
It is the general name of incident beam being paid the structure of optical path difference that the optical path difference is here paid structure.Optical path difference is paid and is comprised also in the structure that the phase difference of paying phase difference pays structure.In addition, phase difference is paid and is comprised diffraction structure in the structure.Optical path difference of the present invention is paid and is constructed preferably diffraction structure.Optical path difference is paid structure and is had step, preferably has a plurality of steps.By this step to incident beam additional optical path difference and/or phase difference.
The mould of the 4th record; It is the mould of putting down in writing in any one of the 1st to the 3rd; It is characterized in that; Said object optical element be make wavelength X 1 (the 1st beam condenser of 375nm≤λ 1≤435nm) on the information recording surface of the 1st CD of protective layer with thickness t 1, the 2nd beam condenser that makes wavelength X 2 (λ 1＜λ 2) is in having thickness t 2 (thereby the object optical element that the optical take-up apparatus that carries out information record and/or regeneration on the information recording surface of the 2nd CD of the protective layer of t1＜t2) is used; Said object optical element has the central area that contains optical axis, the neighboring area that is provided with around it at least; Said the 1st light beam that passes said central area by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of said the 1st CD; Said the 2nd light beam that passes said central area by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of said the 2nd CD; Said the 1st light beam that passes said neighboring area by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of said the 1st CD, said the 2nd light beam that passes said neighboring area not by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of said the 2nd CD.
During like the situation of the above-mentioned object optical element that multiple CD is carried out information record and/or regeneration; Compare with the special-purpose object optical element that does not have interchangeability that only a kind of CD is carried out the information record and/or regenerate, the core that more must reduce optical surface departs from, according to the present invention; Because can reduce the core of optics of lens face departs from; So, even this object optical element that multiple CD is carried out information record and/or regeneration also can optical characteristics carry out moulding well.
The mould of the 5th record; It is the mould of putting down in writing in any one of the 1st to the 3rd; It is characterized in that; Said object optical element be make wavelength X 1 (the 1st beam condenser of 375nm≤λ 1≤435nm) on the information recording surface of the 1st CD of protective layer with thickness t 1, the 2nd beam condenser that makes wavelength X 2 (λ 1＜λ 2) in have thickness t 2 (on the information recording surface of the 2nd CD of the protective layer of t1＜t2), the 3rd beam condenser that makes wavelength X 3 (λ 2＜λ 3) is in having thickness t 3 (thereby the object optical element that the optical take-up apparatus that carries out information record and/or regeneration on the information recording surface of the 3rd CD of the protective layer of t2＜t3) is used; The zone line that is provided with between neighboring area, said central area and said neighboring area that said object optical element has the central area that contains optical axis at least, be provided with around it; Said the 1st light beam that passes said central area by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of said the 1st CD; Said the 2nd light beam that passes said central area by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of said the 2nd CD; Said the 3rd light beam that passes said central area by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of said the 3rd CD; Said the 1st light beam that passes said zone line by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of said the 1st CD; Said the 2nd light beam that passes said zone line by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of said the 2nd CD; Said the 3rd light beam that passes said zone line not by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of said the 3rd CD; Said the 1st light beam that passes said neighboring area is concentrated on the information recording surface of said the 1st CD; Said the 2nd light beam that passes said neighboring area is not concentrated on the information recording surface of said the 2nd CD, and said the 3rd light beam that passes said neighboring area is not concentrated on the information recording surface of said the 3rd CD.
As above-mentioned when at least 3 kinds of CDs being carried out the situation of object optical element of information record and/or regeneration; Compare with the object optical element that only a kind or 2 kinds of CDs is carried out information record and/or regeneration, the core that more must reduce optical surface departs from, according to the present invention; Because can reduce the core of optics of lens face departs from; So, even this object optical element that at least 3 kinds of CDs are carried out information record and/or regeneration also can optical characteristics carry out moulding well.
The mould of the 6th record; It is the mould of record in the 4th or the 5th; It is characterized in that, be the center thickness of f1 (mm), said object optical element when being d (mm) with the focal length of said object optical element when said the 1st light beam, satisfies 0.7≤d/f1≤2.0.
During with the situation of short wavelength, object optical element that high NA CD is corresponding, the thickness on the optical axis of object optical element is too big with the ratio of focal length, and an axle outer light beam is easy to generate astigmatism when inciding object optical element, can not guarantee operating distance, has problems.And the thickness on the optical axis of object optical element is too little with the ratio of focal length, and the core that then produces the optics of lens face departs from the problem of sensitivity rising.Through satisfying following formula, can suppress the generation of astigmatism and the core of optics of lens face and depart from sensitivity.
The mould of the 7th record; It is the mould of putting down in writing in any one of the 1st to the 3rd; It is characterized in that; Being the object optical element that optical take-up apparatus is used, is that (the 1st beam condenser of 375nm≤λ 1≤435nm) on the information recording surface of the 1st CD of the protective layer with thickness t 1 and only carries out the object optical element that the optical take-up apparatus of information record and/or regeneration is used to said the 1st CD through making wavelength X 1.
Use object optical element with short wavelength, object optical element, for example BD that high NA CD is corresponding; Compare with object optical element with CD, DVD, the core that more must reduce optical surface departs from, according to the present invention; Because can reduce the core of optics of lens face departs from; So, even this and short wavelength, the corresponding object optical element of high NA CD also can optical characteristics carry out moulding well.
The mould of the 8th record; It is the mould of record in the 7th; It is characterized in that, be the center thickness of f1 (mm), said object optical element when being d (mm) with the focal length of said object optical element when said the 1st light beam, satisfies 0.9≤d/f1≤2.0.
During with the situation of short wavelength, object lens that high NA CD is corresponding, the thickness on the objective lens optical axis is too big with the ratio of focal length, and an axle outer light beam is easy to generate astigmatism when inciding object lens, can not guarantee operating distance, has problems.And the thickness on the objective lens optical axis is too little with the ratio of focal length, and the core that then produces the optics of lens face departs from the problem of sensitivity rising.Through satisfying following formula, can suppress the generation of astigmatism and the core of optics of lens face and depart from sensitivity.
In this specification, the 1st CD has the protective substrate and the information recording surface of thickness t 1, and the 2nd CD has thickness 2, and (protective substrate and the information recording surface of t1＜t2), the 3rd CD have thickness t 3 (protective substrate and the information recording surface of t2＜t3).Preferred the 1st CD is BD (Blu-ray Disc), and the 2nd CD is DVD, and the 3rd CD is CD, but is not limited thereto.The 1st CD, the 2nd CD or the 3rd CD also can be the multiplayer optical disks with a plurality of information recording surfaces.The thickness of protective substrate comprises 0 situation, or on CD, also comprises its thickness during coating thickness number to the diaphragm of tens of μ m.
BD carries out the information recording/reproducing by the object optical element of NA0.85, and protective substrate thickness is the 0.1mm degree.DVD is that the object optical element by NA0.60～0.67 degree carries out the information recording/reproducing, protective substrate thickness is the general name of the DVD series CD of 0.6mm degree, comprises DVD-ROM, DVD-Video, DVD-Audio, DVD-RAM, DVD-R, DVD-RW, DVD+R, DVD+RW etc.In this specification, CD is that the object optical element by NA0.45～0.53 degree carries out the information recording/reproducing, protective substrate thickness is the general name of the CD series CD of 1.2mm degree, comprises CD-ROM, CD-Audio, CD-Video, CD-R, CD-RW etc.Packing density is that the packing density of BD is the highest, below reduces in proper order by DVD, CD.
The thickness t 1 of relevant protective substrate, t2, t3, the formula that preferably meets the following conditions (1), (2), (3), but be not limited thereto.Here the thickness of said protective substrate is provided in a side of the thickness of the protective substrate of optical disc surface.That is: from optical disc surface near the thickness of the protective substrate of the information recording surface on surface.
0.0750mm≤t1≤0.1125mm (1)
0.5mm≤t2≤0.7mm (2)
1.0mm≤t3≤1.3mm (3)。
In this specification, preferred the 1st light source, the 2nd light source, the 3rd light source are LASER Light Sources.LASER Light Source can preferably adopt semiconductor laser, silicon laser etc.The 3rd wavelength X 3 (λ 3＞λ 2) formula that meets the following conditions (4), (5) of the 2nd wavelength X 2 (λ 2＞λ 1) of the 1st wavelength X 1 of the 1st light beam that preferably penetrates from the 1st light source, the 2nd light beam that penetrates from the 2nd light source, the 3rd light beam that penetrates from the 3rd light source:
1.5×λ1＜λ2＜1.7×λ1 (4)
1.8×λ1＜λ3＜2.0×λ1 (5)。
As the 1st CD, the 2nd CD, the 3rd CD; When adopting BD, DVD, CD respectively, the 1st wavelength X 1 of the 1st light source is preferably below the above 435nm of 375nm, more preferably below the above 420nm of 390nm; The 2nd wavelength X 2 of the 2nd light source is preferably below the above 680nm of 570nm; More preferably below the above 680nm of 630nm, the 3rd wavelength X 3 of the 3rd light source is preferably below the above 850nm of 750nm, more preferably below the above 820nm of 760nm.
The injection (mo(u)lding) machine of the 9th record is characterized in that, has the mould of putting down in writing in any one of the 1st to the 8th.
Thus, can reduce the lens core and depart from, can reduce the generation of coma aberration, can provide operation property excellent injection (mo(u)lding) machine.
The manufacturing approach of the object optical element of the 10th record; It is the manufacturing approach of making the object optical element that the NA value uses at the optical take-up apparatus below 0.95 more than 0.70 by mould; It is characterized in that; Said mould has the 1st template, the 1st core, the 2nd template, the 2nd core; Said the 1st template has the 1st core support cave that is used for installing said the 1st core; Said the 2nd template has the 2nd core that is used for installing said the 2nd core and supports the cave, and said the 2nd template of said relatively the 1st template is configured in the above-below direction of gravity direction by coincidence, and said the 1st core has the 1st optics transfer surface of the 1st optical surface that is used for forming said object optical element; Said the 2nd core has the 2nd optics transfer surface of the 2nd optical surface that is used for forming said object optical element; The absolute value of the radius of curvature of said the 1st optics transfer surface, the absolute value less than the radius of curvature of said the 2nd optics transfer surface has: with the operation of resin injection in the chamber that is formed by said the 1st optics transfer surface and said the 2nd optics transfer surface; Said the 1st template of die sinking and said the 2nd template, support the operation of said object optical element with said the 1st core; Support the operation of said the 1st core demoulding of said object optical element when making said object optical element from die opening state.
According to this manufacturing approach, the core that can reduce lens departs from, and can reduce the generation of coma aberration.Therefore, when the generation that departs from the coma aberration that causes at the molded lens core especially becomes the object lens that use in the optical take-up apparatus of problem, also can moulding can access the object lens of good optical characteristic.Take place greatly easily because of the NA value that core departs from and when the little BD of permissible range that CD, DVD compare coma aberration with object lens uses object lens in moulding, also can moulding can access the object lens of good optical characteristic.
The effect of invention
According to the present invention, the core that can reduce lens departs from, and can reduce the generation of coma aberration.Therefore, when the generation that departs from the coma aberration that causes at the molded lens core especially becomes the object lens that use in the optical take-up apparatus of problem, also can moulding can access the object lens of good optical characteristic.Especially take place greatly easily because of the NA value that core departs from and when the little BD of permissible range that CD, DVD compare coma aberration with object lens uses object lens in moulding, also can moulding can access the object lens of good optical characteristic.And according to the present invention, the operation property raising in the time of can making moulding can make production efficiency improve.
Description of drawings
Fig. 1: a routine summary schematic cross-section of this embodiment mould.
The specific embodiment
Below specify the present invention, but the present invention is not limited thereto through embodiment.Fig. 1 is a routine summary schematic cross-section of this embodiment mould.Mould with figure expression resin lens.
The mould of this embodiment is to make the NA value to use mould in the injection moulding of the objective optical element for optical pickup device below 0.95 more than 0.70.As shown in Figure 1, mould has the 1st template the 5, the 1st core the 7, the 2nd template the 6, the 2nd core 8.
The 1st template 5 has the 1st core that is used for installing the 1st core 7 and supports cave 18, the 2 templates 6 and have the 2nd core that is used for installing the 2nd core 8 and support cave 19.As shown in Figure 1, the 1st core supports the 18, the 2nd core support cave 19, cave and is become same linearity by assortment.In addition, relative the 1st template 5 the 2nd template 6 is configured in the above-below direction of gravity direction.In this embodiment, relative the 1st template 5 the 2nd template 6 is configured in gravity direction top one side.
In addition, shaping mould is according to having the 1st receiving plate 3 and the 2nd receiving plate 4.The 1st receiving plate 3 is installed on the 1st installing plate 1, the 1st template 5 is installed on the 1st receiving plate 3.Equally, the 2nd receiving plate 4 is installed on the 2nd installing plate 2, the 2nd template 6 is installed on the 2nd receiving plate 4.The 1st template 5 and the 2nd template 6 can open and close with spue line PL.
The 1st core 7 has the 1st optics transfer surface 9, the 2 cores 8 that are used for forming object optical element the 1st optical surface and has the 2nd optics transfer surface 10 that is used for forming object optical element the 2nd optical surface.Here, the 1st optics transfer surface 9 and the 2nd optics transfer surface 10 form the optical function face of object optical element.In addition, the 1st core 7 has the 1st bead that is used for forming object optical element bead part and forms face 11, the 2 cores and have the 2nd bead that is used for forming object optical element bead part and form face 12.
The absolute value of the radius of curvature of the 1st optics transfer surface 9 is less than the absolute value of the radius of curvature of the 2nd optics transfer surface 10.In addition, the 1st optics transfer surface 9 has the optical path difference that is made up of a plurality of steps and pays structure (not diagram).In this embodiment, it is the diffraction structure that is made up of a plurality of steps that the optical path difference that the 1st optics transfer surface 9 is provided with is paid structure.The 1st optics transfer surface 9 also can be made up of the plane of refraction that does not have optical path difference to pay structure.
Among Fig. 1, chamber 13 is the molding spaces that form object optical element.Chamber 13 is molding spaces, forms face 11, is located at the 1st core that the 2nd optics transfer surface 10 and the 2nd bead on the 2nd core 8 form face the 12, the 1st template 5 and supports cave 18 and form by being located at the 1st optics transfer surface 9 and the 1st bead on the 1st core 7.Wherein, the 1st bead formation face the 11, the 2nd bead formation face 12 is the faces that are used for forming the object optical element lip portions.Also can the bead formation face that be used for forming the object optical element lip portions be located on the 1st template 5 and the 2nd template 6.
Be respectively equipped with 2 streams 14 on the 1st template 5 and the 2nd template 6, they connect in the vertical direction of gravity direction.Stream 14 is regulated machine (non-diagram) with mold temperature and is communicated with, and makes by the heat medium of supplying with from this mold temperature adjusting machine to circulate in the stream 14, adjusts the temperature of the 1st template 5 and the 2nd template 6.In this embodiment, regulate machine, adopt water to regulate machine as the water temperature of heat medium as mold temperature.Also can adopt with the oily temperature adjusting machine of oil as heat medium.But water temperature is regulated machine and is compared the required time that can shorten intensification, cooling with oil temperature adjusting machine, more preferably.
The resin that is melted at injection device (non-diagram) pass running channel 15, runner 16, cast gate 17 by injection molding process in chamber 13, cooling, solidify.Under the state of cooling, curing, the bead of object optical element and cast gate are the states that is integrally formed, and cut off gate portions in the cast gate cutting action afterwards.
Die sinking the 1st template the 5, the 2nd template 6 after the resin cooling curing.Under this die opening state, as the object optical element of moulding article by 7 supportings of the 1st core and not by the state of the 2nd core 8 supportings.Carry out after the die sinking, carry out the demoulding of moulding article object optical element from the 1st core 7 that supports object optical element.Die opening state compacted under article object optical element is by 7 supportings of the 1st core, that is, moulding article object optical element is stayed on the 1st template 5 that is configured in gravity direction below one side.Therefore, even carry out the demoulding of object optical element, because object optical element stays on the 1st template, so object optical element does not fall, damages the worry of lens face when not having the demoulding yet from the 1st core.
Method as making object optical element from 7 demouldings of the 1st core can adopt known in the past the whole bag of tricks.In this embodiment, the 1st core 7 can slide in the 1st core supports cave 18, and is moving through the 1st core 7 is breakked away to the 2nd template 6 one, ejects, makes the object optical element demoulding thus.Because being formed on the 1st optics transfer surface 9 on the 1st core 7 has the optical path difference that is made up of a plurality of steps and pays structure; So; The 1st core 7 is breakked away to the 2nd template 6 one to be moved, ejects and during demoulding object optical element; Whole the quilt that the object optical element optical path difference is paid structure ejects, and can reduce the warpage that optical path difference is paid structure, can have the object optical element that the optical path difference that can access the optical characteristics of being hoped is paid structure with higher precision manufacturing.
In addition; When carrying out die sinking; Depart from even produce between the 1st template the 5, the 2nd template 6; The face that the 1st optics transfer surface 9 and the object optical element optical path difference of the 1st core 7 are paid structure can not depart from yet, so, can have the object optical element that the optical path difference that can access the optical characteristics of being hoped is paid structure with higher precision manufacturing.
As the method for distinguishing that makes object optical element from 7 demouldings of the 1st core; Also can on the 1st core 7 or the 1st template 5, establish ejecting mechanisms such as knock pin, eject the bead part of object optical element and the 1st optical surface of object optical element carries out the demoulding by this ejecting mechanism.Eject the lip portions timesharing of object optical element, because do not have to pay the worry of structural deformation, so preferred because of ejecting the optical path difference that causes being formed on the object optical element.
Object optical element by the mould of this embodiment is made is: the 1st beam condenser that makes wavelength X 1=405nm on the information recording surface of the 1st CD (BD) of protective layer with thickness t 1=0.1mm, the 2nd beam condenser that makes wavelength X 2=660nm in the 2nd CD (DVD) of protective layer with thickness t 2=0.6mm thus information recording surface on carry out the object optical element that the optical take-up apparatus of information record and/or regeneration is used; At least have the central area that contains optical axis, the neighboring area that is provided with around it; The 1st light beam that passes the central area by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of the 1st CD; The 2nd light beam that passes the central area by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of the 2nd CD; The 1st light beam that passes the neighboring area by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of the 1st CD, the 2nd light beam that passes the neighboring area not by can the information record and/or again the dried rhizome of rehmannia be concentrated on the object optical element on the information recording surface of the 2nd CD.Form optical path difference at least one side of central area or neighboring area and paid structure.
In addition, the object optical element of being made by this embodiment mould is the center thickness of f1 (mm), object optical element when being d (mm) with the focal length of object optical element when the 1st light beam, and d/f1=1.1 satisfies 0.7≤d/f1≤2.0.
In this embodiment, relative the 1st template the 2nd template is configured in gravity direction top one side, that is, be the structure that a side the 1st optics transfer surface that the absolute value of radius of curvature is little is configured in gravity direction below one side.Therefore, when manufacturing d/f1 value is the object optical element of 0.7≤d/f1≤2.0 that kind, also can separate the bubble of cooling down, improve transfer printing property.
Except that above-mentioned object optical element; Object optical element as being made by this embodiment mfg. moulding die also can be: the 1st beam condenser that makes wavelength X 1=405nm on the information recording surface of the 1st CD (BD) of protective layer with thickness t 1=0.1mm, the 2nd beam condenser that makes wavelength X 2=660nm on the information recording surface of the 2nd CD (DVD) of protective layer with thickness t 2=0.6mm, the 3rd beam condenser that makes wavelength X 3=785nm in the 3rd CD (DVD) of protective layer with thickness t 3=1.2mm thus information recording surface on carry out information record and/or regeneration objective optical element for optical pickup device; At least the zone line that is provided with between neighboring area, central area and the neighboring area that have the central area that contains optical axis, is provided with around it; The 1st light beam that passes the central area by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of the 1st CD; The 2nd light beam that passes the central area by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of the 2nd CD; The 3rd light beam that passes the central area by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of the 3rd CD; The 1st light beam that passes zone line by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of the 1st CD; The 2nd light beam that passes zone line by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of the 2nd CD; The 3rd light beam that passes zone line not by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of the 3rd CD; The 1st light beam that passes the neighboring area is concentrated on the information recording surface of the 1st CD; The 2nd light beam that passes the neighboring area is not concentrated on the information recording surface of the 2nd CD, and the 3rd light beam that passes the neighboring area is not concentrated on the object optical element on the information recording surface of the 3rd CD.
Preferred this object optical element is when the focal length during at the 1st light beam is the center thickness of f1 (mm), object optical element when being d (mm) with object optical element, satisfied 0.7≤d/f1≤2.0.
And; Except that above-mentioned object optical element; Object optical element as being made by this embodiment mfg. moulding die also can be: the 1st beam condenser through making wavelength X 1=405nm is on the information recording surface of the 1st CD (BD) of the protective layer with thickness t 1=0.1mm and the objective optical element for optical pickup device that only the 1st CD (BD) is carried out information record and/or regeneration.
Preferred this object optical element is when the focal length during at the 1st light beam is the center thickness of f1 (mm), object optical element when being d (mm) with object optical element, satisfied 0.9≤d/f1≤2.0.
Availability on the industry
The present invention can provide and can reduce the manufacturing approach that the lens core departs from the generation of the coma aberration that causes and is carried out to mould, injection (mo(u)lding) machine and the object optical element of type die adjustment easily; So, the formed precision object optical element that optical take-up apparatus high, that can access the good optical characteristic is used can be provided.
Symbol description
1 the 1st installing plate
2 the 2nd installing plates
3 the 1st receiving plates
4 the 2nd receiving plates
5 the 1st templates
6 the 2nd templates
7 the 1st cores
8 the 2nd cores
9 the 1st optics transfer surfaces
10 the 2nd optics transfer surfaces
11 the 1st beads form face
12 the 2nd beads form face
13 chambeies
14 streams
15 running channels
16 runners
17 cast gates
18 the 1st cores support the cave
19 the 2nd cores support the cave
Claims (10)
1. a mould is to make the mould that the NA value is used in the injection moulding of the objective optical element for optical pickup device below 0.95 more than 0.70, it is characterized in that,
Said mould has the 1st template, the 1st core, the 2nd template, the 2nd core,
Said the 1st template has the 1st core support cave that is used for installing said the 1st core, and said the 2nd template has the 2nd core support cave that is used for installing said the 2nd core,
Said the 2nd template of said relatively the 1st template is configured in the above-below direction of gravity direction by coincidence,
Said the 1st core has the 1st optics transfer surface of the 1st optical surface that is used for forming said object optical element, when said the 1st template and said the 2nd template die sinking, supports said object optical element,
Said the 2nd core has the 2nd optics transfer surface of the 2nd optical surface that is used for forming said object optical element, when said the 1st template and said the 2nd template die sinking, does not support said object optical element,
The absolute value of the radius of curvature of said the 1st optics transfer surface is less than the absolute value of the radius of curvature of said the 2nd optics transfer surface.
2. like the mould of record in the claim 1, it is characterized in that said the 2nd template of said relatively the 1st template is configured in gravity direction top one side.
3. like the mould of record in claim 1 or 2, it is characterized in that at least a portion of said the 1st optics transfer surface has the optical path difference that is made up of a plurality of steps and pays structure.
4. the mould as putting down in writing in any one of claim 1 to 3 is characterized in that,
Said object optical element be make wavelength X 1 (the 1st beam condenser of 375nm≤λ 1≤435nm) on the information recording surface of the 1st CD of protective layer with thickness t 1, the 2nd beam condenser that makes wavelength X 2 (λ 1＜λ 2) is in having thickness t 2 (thereby the object optical element that the optical take-up apparatus that carries out information record and/or regeneration on the information recording surface of the 2nd CD of the protective layer of t1＜t2) is used
Said object optical element has the central area that contains optical axis, the neighboring area that is provided with around it at least,
Said the 1st light beam that passes said central area by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of said the 1st CD; Said the 2nd light beam that passes said central area by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of said the 2nd CD
Said the 1st light beam that passes said neighboring area by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of said the 1st CD, said the 2nd light beam that passes said neighboring area not by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of said the 2nd CD.
5. the mould as putting down in writing in any one of claim 1 to 3 is characterized in that,
Said object optical element is to make wavelength X 1 (the 1st beam condenser of 375nm≤λ 1≤435nm) is on the information recording surface of the 1st CD of the protective layer with thickness t 1; The 2nd beam condenser that makes wavelength X 2 (λ 1＜λ 2) is in having thickness t 2 (on the information recording surface of the 2nd CD of the protective layer of t1＜t2); The 3rd beam condenser that makes wavelength X 3 (λ 2＜λ 3) is in having thickness t 3 (thereby the object optical element that the optical take-up apparatus that carries out information record and/or regeneration on the information recording surface of the 3rd CD of the protective layer of t2＜t3) is used
The zone line that is provided with between neighboring area, said central area and said neighboring area that said object optical element has the central area that contains optical axis at least, be provided with around it,
Said the 1st light beam that passes said central area by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of said the 1st CD; Said the 2nd light beam that passes said central area by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of said the 2nd CD; Said the 3rd light beam that passes said central area by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of said the 3rd CD
Said the 1st light beam that passes said zone line by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of said the 1st CD; Said the 2nd light beam that passes said zone line by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of said the 2nd CD; Said the 3rd light beam that passes said zone line not by can the information record and/or again the dried rhizome of rehmannia be concentrated on the information recording surface of said the 3rd CD
Said the 1st light beam that passes said neighboring area is concentrated on the information recording surface of said the 1st CD; Said the 2nd light beam that passes said neighboring area is not concentrated on the information recording surface of said the 2nd CD, and said the 3rd light beam that passes said neighboring area is not concentrated on the information recording surface of said the 3rd CD.
6. like the mould of record in claim 4 or 5, it is characterized in that, is the center thickness of f1 (mm), said object optical element when being d (mm) with the focal length of said object optical element when said the 1st light beam, satisfies 0.7≤d/f1≤2.0.
7. the mould as putting down in writing in any one of claim 1 to 3; It is characterized in that the object optical element that said optical take-up apparatus is used is that (the 1st beam condenser of 375nm≤λ 1≤435nm) on the information recording surface of the 1st CD of the protective layer with thickness t 1 and only carries out the object optical element that the optical take-up apparatus of information record and/or regeneration is used to said the 1st CD through making wavelength X 1.
8. like the mould of record in the claim 7, it is characterized in that, is the center thickness of f1 (mm), said object optical element when being d (mm) with the focal length of said object optical element when said the 1st light beam, satisfies 0.9≤d/f1≤2.0.
9. an injection (mo(u)lding) machine is characterized in that, has the mould as putting down in writing in any one of claim 1 to 8.
10. the manufacturing approach of an object optical element is a manufacturing approach of being made the object optical element that the NA value uses at the optical take-up apparatus below 0.95 more than 0.70 by mould, it is characterized in that,
Said mould has the 1st template, the 1st core, the 2nd template, the 2nd core,
Said the 1st template has the 1st core support cave that is used for installing said the 1st core, and said the 2nd template has the 2nd core support cave that is used for installing said the 2nd core,
Said the 2nd template of said relatively the 1st template is configured in the above-below direction of gravity direction by coincidence,
Said the 1st core has the 1st optics transfer surface of the 1st optical surface that is used for forming said object optical element, and said the 2nd core has the 2nd optics transfer surface of the 2nd optical surface that is used for forming said object optical element,
The absolute value of the radius of curvature of said the 1st optics transfer surface, less than the absolute value of the radius of curvature of said the 2nd optics transfer surface,
Have:
With the operation of resin injection in the chamber that forms by said the 1st optics transfer surface and said the 2nd optics transfer surface;
Said the 1st template of die sinking and said the 2nd template, support the operation of said object optical element with said the 1st core;
Make the operation of said object optical element from said the 1st core demoulding of supporting said object optical element.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-080831 | 2010-03-31 | ||
| JP2010080831 | 2010-03-31 | ||
| PCT/JP2011/052486 WO2011122106A1 (en) | 2010-03-31 | 2011-02-07 | Molding die, injection molding machine, and method of manufacturing objective optical element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102834240A true CN102834240A (en) | 2012-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011800171495A Pending CN102834240A (en) | 2010-03-31 | 2011-02-07 | Molding die, injection molding machine, and method of manufacturing objective optical element |
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| Country | Link |
|---|---|
| JP (1) | JP5765333B2 (en) |
| CN (1) | CN102834240A (en) |
| WO (1) | WO2011122106A1 (en) |
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| JP2008234724A (en) * | 2007-03-19 | 2008-10-02 | Konica Minolta Opto Inc | Compound objective lens forming mold, compound objective lens, and optical pickup device |
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| JP2009181645A (en) * | 2008-01-31 | 2009-08-13 | Konica Minolta Opto Inc | Objective optical element and optical pickup device |
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| JPH0768614A (en) * | 1993-09-03 | 1995-03-14 | Olympus Optical Co Ltd | Injection molding die and injection molding method for optical element |
| JP3477249B2 (en) * | 1994-08-12 | 2003-12-10 | ファナック株式会社 | Vertical injection molding machine |
| JP2006343387A (en) * | 2005-06-07 | 2006-12-21 | Konica Minolta Opto Inc | Optical element and its manufacturing method |
| JPWO2009122862A1 (en) * | 2008-03-31 | 2011-07-28 | コニカミノルタオプト株式会社 | Optical element manufacturing method, optical element molding die, and optical element |
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- 2011-02-07 CN CN2011800171495A patent/CN102834240A/en active Pending
- 2011-02-07 WO PCT/JP2011/052486 patent/WO2011122106A1/en active Application Filing
- 2011-02-07 JP JP2012508126A patent/JP5765333B2/en not_active Expired - Fee Related
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| CN101505942A (en) * | 2006-08-30 | 2009-08-12 | 柯尼卡美能达精密光学株式会社 | Optical element forming apparatus |
| CN101529300A (en) * | 2006-11-01 | 2009-09-09 | 柯尼卡美能达精密光学株式会社 | Optical element, resin molding metal die and optical element manufacturing method |
| JP2008234724A (en) * | 2007-03-19 | 2008-10-02 | Konica Minolta Opto Inc | Compound objective lens forming mold, compound objective lens, and optical pickup device |
| CN101269538A (en) * | 2007-03-22 | 2008-09-24 | 柯尼卡美能达精密光学株式会社 | Injection molding device and molding method |
| JP2009181645A (en) * | 2008-01-31 | 2009-08-13 | Konica Minolta Opto Inc | Objective optical element and optical pickup device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5765333B2 (en) | 2015-08-19 |
| WO2011122106A1 (en) | 2011-10-06 |
| JPWO2011122106A1 (en) | 2013-07-08 |
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Application publication date: 20121219 |