WO2011033919A1 - 対物レンズ、光ピックアップ装置及び光情報記録再生装置 - Google Patents
対物レンズ、光ピックアップ装置及び光情報記録再生装置 Download PDFInfo
- Publication number
- WO2011033919A1 WO2011033919A1 PCT/JP2010/064583 JP2010064583W WO2011033919A1 WO 2011033919 A1 WO2011033919 A1 WO 2011033919A1 JP 2010064583 W JP2010064583 W JP 2010064583W WO 2011033919 A1 WO2011033919 A1 WO 2011033919A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- objective lens
- optical
- wavelength
- light
- δsa
- Prior art date
Links
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
- G02B5/1876—Diffractive Fresnel lenses; Zone plates; Kinoforms
-
- 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
Definitions
- the present invention relates to an objective lens, an optical pickup device, and an optical information recording / reproducing device.
- the oscillation wavelength of the longitudinal mode of a laser light source such as an optical pickup device generally changes due to temperature change or output change (change of the maximum output longitudinal mode is called a mode hop phenomenon).
- the oscillation wavelength of a blue laser diode used for a Blu-ray disc (hereinafter referred to as BD) may change by about 1 nm when the output is greatly changed.
- the oscillation wavelength of the blue laser diode may change to a longer wavelength side by about 1 nm due to a change in output in switching from reproduction to recording.
- the refractive index of the objective lens of the optical pickup device changes with a change in the oscillation wavelength of the laser light. For this reason, when the oscillation wavelength of the laser light changes, the position (focus position) at which the laser light is converged by the objective lens changes. Therefore, when the shift of the focus position becomes large, the focus control is lost, which may cause a problem that recording and reproduction on the optical disc cannot be performed.
- Patent Document 1 discloses an objective lens for an optical pickup device that can keep the focus position of the laser light within the depth of focus even when the oscillation wavelength of the laser light changes suddenly.
- the objective lens disclosed in Patent Document 1 has a plurality of annular zone steps on at least one surface of the objective lens.
- the plurality of annular zone steps have a level difference that generates a phase difference such that the convergence position of the laser beam converged by the objective lens is within the depth of focus when the wavelength of the laser beam is changed.
- a phase difference is generated in the laser beam that has passed through the annular zone so that the convergence position is within the depth of focus.
- difference of the focus position accompanying a wavelength change is reduced with the said phase difference.
- the blue laser diode as described above has a high output, and the temperature of the blue laser diode rises as drive power increases, and the temperature of the optical pickup device rises due to heat conduction.
- the temperature of the optical pickup device increases, a change in the refractive index of the objective lens occurs in addition to a change in the oscillation wavelength of the laser light. That is, as the temperature of the optical pickup device rises, in addition to the deviation of the convergence position caused by the change of the wavelength of the laser beam, the deviation of the convergence position caused by the change of the refractive index of the objective lens occurs.
- the objective lens is a plastic lens
- the refractive index change due to temperature change is larger than that of the glass lens. Therefore, the deviation of the convergence position caused by the change in the refractive index of the objective lens becomes more remarkable.
- the objective lens described in Patent Document 1 is an invention made only in view of reducing the shift of the convergence position when the wavelength of the laser light changes, and the convergence position that occurs when the temperature of the optical pickup device changes. The shift was not taken into account. In other words, the objective lens described in Patent Document 1 has a problem that the convergence position is deviated when the temperature of the optical pickup device changes, and therefore the temperature characteristics are poor. Furthermore, in the annular structure of the objective lens described in Patent Document 1, the width of each annular zone becomes too small, and the transmittance decreases due to the stepped portion, so that the light utilization efficiency is poor. It was.
- the present invention has been made in order to solve such a problem, and it is possible to reduce a convergence position shift (focus position shift) that occurs when the oscillation wavelength of a laser beam changes, and to further improve temperature characteristics.
- Another object of the present invention is to provide an optical pickup objective lens and an optical pickup device that are excellent in light use efficiency.
- a condensing optical system including an objective lens for condensing on the information recording surface of the optical disc via the optical disc, and the condensing optical system condenses the light beam from the light source on the information recording surface of the optical disc
- an objective lens used in an optical pickup device for recording and / or reproducing information wherein the objective lens has an image-side numerical aperture of 0.75 or more, and the objective lens includes a plurality of annular zones.
- the ring zone structure that is configured and formed so that adjacent ring zones generate a predetermined optical path difference with respect to incident light is provided on at least one optical surface, and the ring zone structure has a step difference.
- Direction is small within the effective diameter It is a folded structure that is replaced at least once, and satisfies the following expression (1).
- ⁇ (nm) is the amount of change in wavelength
- ⁇ SA ( ⁇ rms) is the spherical aberration of the objective lens caused by the change in wavelength ⁇
- ⁇ f (mm) is the objective caused by the change in wavelength ⁇ . It represents the axial chromatic aberration of the lens.
- the present inventor changes the axial chromatic aberration in the positive direction and makes the spherical aberration under (undercorrection), thereby reducing the wavelength of the light beam.
- the wavelength change is likely to occur as the output of the laser beam increases, so the effect of the present invention becomes more remarkable.
- the spherical aberration that occurs when the light beam incident on the objective lens has a longer wavelength is underlined. If the temperature of the optical pickup device is increased and the objective lens is a plastic lens, the refractive index of the objective lens changes and the spherical aberration becomes over. On the other hand, when the temperature of the optical pickup device increases, the wavelength of the light source becomes longer, so that an under spherical aberration occurs, and the previous over spherical aberration can be canceled out. Therefore, it is possible to suppress the occurrence of spherical aberration that occurs when the temperature of the optical pickup device rises. That is, it becomes possible to obtain good temperature characteristics, and when the objective lens is made of plastic, it is possible to provide an objective lens that can maintain stable performance even when the temperature changes.
- the optical pickup device is used in various environments, it can be said that it is difficult to maintain the ambient temperature constant. Therefore, when a lens having poor temperature characteristics is used, it is necessary to control spherical aberration generated due to a change in the environmental temperature as in the active correction mechanism, and the configuration of the optical pickup device may be complicated and increase the cost. is there.
- good temperature characteristics can be obtained, so that the configuration of the optical pickup device can be simplified.
- the objective lens described in Patent Document 1 has a blaze-type diffractive structure, and the direction of the step of the annular zone structure has a structure that is never changed within the effective diameter. For this reason, there is a problem that the width of the annular zone becomes too small and the light use efficiency is poor. Furthermore, the objective lens described in Patent Document 1 has a problem that the temperature characteristics are poor.
- the ring structure of the objective lens of the present invention has a folded structure in which the direction of the step is changed at least once within the effective diameter. Therefore, when the light beam incident on the objective lens has a longer wavelength, the axial chromatic aberration can be changed in the positive direction. Therefore, when the wavelength is longer, by making the spherical aberration under, it is possible to reduce the focus position shift that occurs when the wavelength of the light beam changes, and to obtain good temperature characteristics. It becomes. Further, by employing a folded structure in which the direction of the step is changed at least once within the effective diameter, the number of annular zones can be reduced and the light utilization efficiency can be improved.
- the “folding structure in which the direction of the step is switched” can also be referred to as a structure in which the sign of the phase difference generated by the adjacent annular zones is reversed.
- the objective lens according to claim 2 is the invention according to claim 1, wherein the axial chromatic aberration changes in the positive direction when the light beam incident on the objective lens has a longer wavelength, and the spherical aberration Is an under character.
- An objective lens according to a third aspect is the invention according to the first or second aspect, wherein an optical path difference added to a wavefront passing through the objective lens is set to a height from an optical axis by the annular structure.
- ⁇ b C 2 ⁇ h 2 + C 4 ⁇ h 4 + C 6 ⁇ h 6 + ⁇ (However, C 2, C 4, C 6, respectively .... secondary, fourth, sixth, and is the optical path difference function coefficients ].
- [Phi b defined by Table when is positive second-order optical path difference function coefficient C 2 is the case of a longer wavelength the wavelength of the light flux incident on the objective lens, characterized in that the spherical aberration becomes under.
- An objective lens according to a fourth aspect is the invention according to any one of the first to third aspects, wherein the ⁇ f / ⁇ and the ⁇ SA / ⁇ satisfy the following expressions (2) and (3): It is characterized by that. 0.00028 ⁇ ⁇ f / ⁇ ⁇ 0.0005 (2) ⁇ 0.02 ⁇ ⁇ SA / ⁇ ⁇ 0.006 (3) However, the sign of the spherical aberration ⁇ SA is “+” when it changes in the over (overcorrection) direction and “ ⁇ ” when it changes in the under (undercorrection) direction.
- the objective lens according to a fifth aspect is the invention according to any one of the first to fourth aspects, wherein the temperature change amount of the optical pickup device is ⁇ T, and is generated due to the temperature change amount ⁇ T.
- the spherical aberration of the objective lens is ⁇ SA ′
- the following equation (4) ⁇ 0.00097 ⁇ ⁇ SA ′ / ⁇ T ⁇ 0.0016 (4) It is characterized by satisfying.
- the temperature change rate of the wavelength of the light beam incident on the objective lens when measuring or calculating ⁇ SA ′ is +0.05 nm / ° C., and the sign of the spherical aberration in ⁇ SA ′ is changed to “+”. “,” And “ ⁇ ” when changing in the under direction.
- An objective lens according to a sixth aspect is the invention according to any one of the first to fifth aspects, wherein the ⁇ f / ⁇ and the ⁇ SA / ⁇ are expressed by the following equations (5) and (6): 0.0003 ⁇ ⁇ f / ⁇ ⁇ 0.0004 (5) ⁇ 0.015 ⁇ ⁇ SA / ⁇ ⁇ 0.006 (6) It is characterized by satisfying.
- An objective lens according to a seventh aspect is the invention according to any one of the first to sixth aspects, wherein the objective lens is generated by the annular structure formed on the inner side in the optical axis orthogonal direction with respect to the folded portion of the objective lens.
- An average value of absolute values of diffraction orders of diffracted light is m1
- the total number of ring zones of the ring zone structure formed on the inner side in the optical axis orthogonal direction with respect to the folded portion of the objective lens is M1.
- the focal length is f (mm)
- An objective lens according to an eighth aspect of the present invention is the invention according to any one of the first to seventh aspects, wherein the annular structure formed outside the folded portion of the objective lens in a direction perpendicular to the optical axis is used.
- the average value of the absolute values of the diffraction orders of the diffracted light generated is m2
- the total number of ring zones of the ring zone structure outside the folded portion of the objective lens in the direction perpendicular to the optical axis is M2
- f (mm) is the following equation (8): 35 ⁇ (m2 ⁇ M2) / f ⁇ 93 (8) It is characterized by satisfying.
- the objective lens according to claim 9 is the invention according to any one of claims 1 to 8, wherein the absolute value of the diffraction order of the diffracted light generated by the annular structure within the effective diameter of the objective lens.
- m is the average number of ring zones of the objective lens
- f (mm) is the focal length of the objective lens, 38 ⁇ (m ⁇ M) / f ⁇ 100 (9) It is characterized by satisfying.
- the objective lens of Claim 10 is an invention in any one of Claim 1-9, Comprising: The image from which the direction of a level
- NA ′ the side numerical aperture
- the objective lens of Claim 11 is invention in any one of Claim 1-10, Comprising: The absolute value of the diffraction order of the diffracted light produced
- the average value m is a natural number of 2 or more.
- m When m is set to a natural number of 2 or more, a large zone width can be secured, and it becomes possible to reduce a decrease in light utilization efficiency due to a shape error at the time of mold processing or a transfer failure at the time of molding.
- the objective lens according to a twelfth aspect is the invention according to any one of the first to eleventh aspects, wherein when the thickness of the objective lens on the optical axis is d, the following expression (11) , 0.9 ⁇ d / f ⁇ 1.8 (11) It is characterized by satisfying.
- An objective lens according to a thirteenth aspect is the invention according to any one of the first to twelfth aspects, wherein the objective lens is a plastic lens.
- An optical pickup device according to a fourteenth aspect is characterized in that the objective lens according to any one of the first to thirteenth aspects is mounted.
- An optical information recording / reproducing apparatus includes the optical pickup apparatus according to a fourteenth aspect.
- the optical pickup device has at least one light source. Furthermore, the optical pickup device of the present invention has a condensing optical system for condensing the light beam emitted from the light source on the information recording surface of the optical disc.
- the optical pickup device of the present invention includes a light receiving element that receives a reflected light beam from the information recording surface of the optical disc.
- the optical disc has a protective substrate having a thickness t and an information recording surface.
- the optical disc is preferably a BD (Blu-ray Disc).
- the optical disc may be a multi-layer optical disc having a plurality of information recording surfaces.
- BD means that information is recorded / reproduced by a light beam having a wavelength of about 390 to 420 nm and an objective lens having an NA of about 0.8 to 0.9, and the thickness of the protective substrate is about 0 mm to 0.125 mm. More preferably, it is a generic name for a BD series optical disc of about 0.075 mm to 0.125 mm, and has a BD having only a single information recording layer, and information recording layers of two layers or three layers or more (for example, four layers). BD etc. are included.
- the thickness of the protective substrate is the thickness of the protective substrate provided on the surface of the optical disk. That is, the thickness of the protective substrate from the optical disc surface to the information recording surface closest to the surface. 0 mm ⁇ t ⁇ 0.125 mm (a)
- the following conditional expression (a) ′, 0.075 mm ⁇ t ⁇ 0.125 mm (a) ′ It is preferable to satisfy.
- the light source is preferably a laser light source.
- a laser light source a semiconductor laser, a silicon laser, or the like can be preferably used.
- the wavelength ⁇ of the light beam emitted from the light source is preferably 350 nm or more and 440 nm or less, more preferably 390 nm or more and 420 nm or less.
- the first light source and a light receiving element described later may be packaged.
- a photodetector such as a photodiode is preferably used.
- Light reflected on the information recording surface of the optical disc enters the light receiving element, and a read signal of information recorded on each optical disc is obtained using the output signal. Furthermore, it detects the change in the light amount due to the spot shape change and position change on the light receiving element, performs focus detection and track detection, and based on this detection, the objective lens can be moved for focusing and tracking I can do it.
- the light receiving element may comprise a plurality of photodetectors.
- the light receiving element may have a main photodetector and a sub photodetector.
- two sub photodetectors are provided on both sides of a photodetector that receives main light used for recording and reproducing information, and the sub light for tracking adjustment is received by the two sub photodetectors. It is good also as a simple light receiving element.
- the light receiving element may have a plurality of light receiving elements corresponding to the respective light sources.
- the condensing optical system has an objective lens.
- the condensing optical system preferably has a coupling lens such as a collimator in addition to the objective lens.
- the coupling lens is a single lens or a lens group that is disposed between the objective lens and the light source and changes the divergence angle of the light beam.
- the collimator is a type of coupling lens, and is a lens that emits light incident on the collimator as parallel light.
- the condensing optical system may have means for moving the coupling lens in the optical axis direction in order to correct aberrations that occur when the temperature changes.
- the objective lens refers to an optical system that is disposed at a position facing the optical disk in the optical pickup device and has a function of condensing the light beam emitted from the light source onto the information recording surface of the optical disk.
- the objective lens may be a glass lens or a plastic lens, or an optical path difference providing structure is provided on the glass lens with a photo-curing resin, a UV-curing resin, or a thermosetting resin.
- a hybrid lens may also be used.
- the objective lens is preferably a plastic lens.
- the objective lens preferably has a refractive surface that is aspheric.
- the base surface on which the annular structure is provided is an aspherical surface.
- the objective lens is a glass lens
- a glass material having a glass transition point Tg of 450 ° C. or lower more preferably 400 ° C. or lower.
- a glass material having a glass transition point Tg of 450 ° C. or lower molding at a relatively low temperature becomes possible, so that the life of the mold can be extended.
- Examples of such a glass material having a low glass transition point Tg include K-PG325 and K-PG375 (both product names) manufactured by Sumita Optical Glass Co., Ltd.
- the specific gravity of the glass lens is generally larger than that of the resin lens, if the objective lens is a glass lens, the mass is increased and a load is imposed on the actuator that drives the objective lens. Therefore, when the objective lens is a glass lens, it is preferable to use a glass material having a small specific gravity.
- the specific gravity is preferably 4.0 or less, more preferably the specific gravity is 3.0 or less.
- the objective lens is a plastic lens
- an alicyclic hydrocarbon polymer material such as a cyclic olefin resin material.
- the resin material has a refractive index of 1.54 to 1.60 at a temperature of 25 ° C. with respect to a wavelength of 405 nm, and a wavelength of 405 nm according to a temperature change within a temperature range of ⁇ 5 ° C. to 70 ° C.
- the coupling lens is preferably a plastic lens.
- a first preferred example includes a polymer block [A] containing a repeating unit [1] represented by the following formula (I), a repeating unit [1] represented by the following formula (1) and the following formula ( II) and / or polymer block [B] containing a repeating unit [3] represented by the following formula (III), and repeating in the block [A] From the block copolymer in which the relationship between the molar fraction a (mol%) of the unit [1] and the molar fraction b (mol%) of the repeating unit [1] in the block [B] is a> b. It is the resin composition which becomes.
- R 1 represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms
- R 2 to R 12 each independently represents a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a hydroxyl group, a carbon number of 1 ⁇ 20 alkoxy groups or halogen groups.
- R 13 represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms.
- each of R 14 and R 15 independently represents a hydrogen atom or an alkyl group having 1 to 20 carbon atoms.
- the second preferred example is obtained by addition polymerization of a monomer composition comprising at least an ⁇ -olefin having 2 to 20 carbon atoms and a cyclic olefin represented by the following general formula (IV).
- Polymer (B) obtained by addition polymerization of polymer (A) and a monomer composition comprising an ⁇ -olefin having 2 to 20 carbon atoms and a cyclic olefin represented by the following general formula (V) ).
- R 1 to R 18 , R a and R b are each independently a hydrogen atom, A halogen atom or a hydrocarbon group, R 15 to R 18 may be bonded to each other to form a monocycle or polycycle, and the monocycle or polycycle in parentheses may have a double bond Alternatively, R 15 and R 16 , or R 17 and R 18 may form an alkylidene group. ]
- R 19 to R 26 each independently represents a hydrogen atom, a halogen atom or a hydrocarbon group.
- the following additives may be added.
- Stabilizer It is preferable to add at least one stabilizer selected from a phenol stabilizer, a hindered amine stabilizer, a phosphorus stabilizer, and a sulfur stabilizer. By suitably selecting and adding these stabilizers, for example, it is possible to more highly suppress the white turbidity and the optical characteristic fluctuations such as the refractive index fluctuations when continuously irradiated with light having a short wavelength of 405 nm. .
- phenol-based stabilizer conventionally known ones can be used.
- 2-t-butyl-6- (3-t-butyl-2-hydroxy-5-methylbenzyl) -4-methylphenyl acrylate
- 2 4-di-t-amyl-6- (1- (3,5-di-t-amyl-2-hydroxyphenyl) ethyl) phenyl acrylate and the like
- JP-A Nos. 63-179953 and 1-168643 JP-A Nos. 63-179953 and 1-168643.
- Preferred hindered amine stabilizers include bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (2,2,6,6-tetramethyl-4-piperidyl) succinate, bis ( 1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, bis (N-octoxy-2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (N-benzyloxy-2, 2,6,6-tetramethyl-4-piperidyl) sebacate, bis (N-cyclohexyloxy-2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (1,2,2,6,6) -Pentamethyl-4-piperidyl) 2- (3,5-di-t-butyl-4-hydroxybenzyl) -2-butylmalonate, bis (1-acryloyl-2,2, , 6-Tetramethyl-4-piperidyl) 2,2-bis (3,5-di-t-but
- the preferable phosphorus stabilizer is not particularly limited as long as it is a substance usually used in the general resin industry.
- triphenyl phosphite diphenylisodecyl phosphite, phenyl diisodecyl phosphite, tris (nonyl).
- Phenyl) phosphite tris (dinonylphenyl) phosphite, tris (2,4-di-t-butylphenyl) phosphite, 10- (3,5-di-t-butyl-4-hydroxybenzyl) -9 Monophosphite compounds such as 1,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide; 4,4′-butylidene-bis (3-methyl-6-tert-butylphenyl-di-tridecyl) Phosphite), 4,4 'isopropylidene-bis (phenyl-di-alkyl (C12-C15)) Fight) and the like diphosphite compounds such as.
- monophosphite compounds are preferable, and tris (nonylphenyl) phosphite, tris (dinonylphenyl) phosphite, tris (2,4-di-t-butylphenyl) phosphite and the like are particularly preferable.
- Preferred sulfur stabilizers include, for example, dilauryl 3,3-thiodipropionate, dimyristyl 3,3′-thiodipropionate, distearyl 3,3-thiodipropionate, lauryl stearyl 3,3- Thiodipropionate, pentaerythritol-tetrakis- ( ⁇ -lauryl-thio) -propionate, 3,9-bis (2-dodecylthioethyl) -2,4,8,10-tetraoxaspiro [5,5] undecane Etc.
- each of these stabilizers is appropriately selected within a range not to impair the purpose of the present invention, but is usually 0.01 to 2 parts by mass with respect to 100 parts by mass of the alicyclic hydrocarbon-based copolymer, The amount is preferably 0.01 to 1 part by mass.
- a surfactant is a compound having a hydrophilic group and a hydrophobic group in the same molecule.
- the surfactant can prevent white turbidity of the resin composition by adjusting the rate of moisture adhesion to the resin surface and the rate of moisture evaporation from the surface.
- hydrophilic group of the surfactant examples include a hydroxy group, a hydroxyalkyl group having 1 or more carbon atoms, a hydroxyl group, a carbonyl group, an ester group, an amino group, an amide group, an ammonium salt, a thiol, a sulfonate, A phosphate, a polyalkylene glycol group, etc. are mentioned.
- the amino group may be primary, secondary, or tertiary.
- the hydrophobic group of the surfactant include an alkyl group having 6 or more carbon atoms, a silyl group having an alkyl group having 6 or more carbon atoms, and a fluoroalkyl group having 6 or more carbon atoms.
- the alkyl group having 6 or more carbon atoms may have an aromatic ring as a substituent.
- Specific examples of the alkyl group include hexyl, heptyl, octyl, nonyl, decyl, undecenyl, dodecyl, tridecyl, tetradecyl, myristyl, stearyl, lauryl, palmityl, cyclohexyl and the like.
- the aromatic ring include a phenyl group.
- the surfactant only needs to have at least one hydrophilic group and hydrophobic group as described above in the same molecule, and may have two or more groups.
- examples of such a surfactant include myristyl diethanolamine, 2-hydroxyethyl-2-hydroxydodecylamine, 2-hydroxyethyl-2-hydroxytridecylamine, 2-hydroxyethyl-2- Hydroxytetradecylamine, pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate, di-2-hydroxyethyl-2-hydroxydodecylamine, alkyl (8-18 carbon atoms) benzyldimethylammonium chloride, ethylene
- examples thereof include bisalkyl (carbon number 8 to 18) amide, stearyl diethanolamide, lauryl diethanolamide, myristyl diethanolamide, palmityl diethanolamide, and the like.
- amine compounds or amide compounds having a hydroxyalkyl group are preferably used. In the present invention, two or more of these compounds may be used in combination.
- the surfactant is based on 100 parts by mass of the alicyclic hydrocarbon-based polymer. It is preferable to add 0.01 to 10 parts by mass.
- the addition amount of the surfactant is more preferably 0.05 to 5 parts by mass, still more preferably 0.3 to 3 parts by mass with respect to 100 parts by mass of the alicyclic hydrocarbon-based polymer.
- Plasticizer The plasticizer is added as necessary to adjust the melt index of the copolymer.
- Plasticizers include bis (2-ethylhexyl) adipate, bis (2-butoxyethyl) adipate, bis (2-ethylhexyl) azelate, dipropylene glycol dibenzoate, tri-n-butyl citrate, tricitrate citrate -N-butylacetyl, epoxidized soybean oil, 2-ethylhexyl epoxidized tall oil, chlorinated paraffin, tri-2-ethylhexyl phosphate, tricresyl phosphate, t-butylphenyl phosphate, tri-2-ethylhexyl phosphate Diphenyl, dibutyl phthalate, diisohexyl phthalate, diheptyl phthalate, dinonyl phthalate, diundecyl phthalate, di-2-ethylhexyl phthalate, diisononyl phthalate, diisode
- cycloolefin resins are preferably used.
- ZEONEX manufactured by Nippon Zeon, APEL manufactured by Mitsui Chemicals, TOPAS ADVANCED, TOPAS manufactured by POLYMERS, and ARTON manufactured by JSR are preferable. Take as an example.
- the Abbe number of the material constituting the objective lens is preferably 50 or more.
- An objective lens according to the present invention has an annular structure formed of a plurality of annular zones and formed such that adjacent annular zones have a predetermined optical path difference with respect to incident light. Have on the surface.
- the annular structure is preferably a diffractive structure.
- the diffractive structure referred to in this specification is a general term for structures that have a step and have a function of converging or diverging a light beam by diffraction.
- a plurality of unit shapes are arranged around the optical axis, and a light beam is incident on each unit shape, and the wavefront of the transmitted light is shifted for each adjacent annular zone. It includes a structure that converges or diverges light by forming a simple wavefront.
- the diffractive structure preferably has a plurality of steps, and the steps may be arranged with a periodic interval in the direction perpendicular to the optical axis, or may be arranged with a non-periodic interval in the direction perpendicular to the optical axis.
- the objective lens provided with a diffractive structure is a single aspherical lens
- the incident angle of the light beam on the objective lens differs depending on the height from the optical axis. It becomes.
- the objective lens is a single aspherical convex lens, even if it is a diffractive structure that generates diffracted light of the same diffraction order, generally, the distance from the optical axis tends to increase.
- the ring structure of the objective lens is a folded structure in which the direction of the step is changed at least once within the effective diameter.
- the folded structure in which the direction of the step is changed at least once within the effective diameter, as shown in FIG. 1 the step of the annular zone structure is directed in the opposite direction to the optical axis, as shown in FIG. It is a structure in which the level difference of the ring zone structure is directed in the direction of the optical axis on the outer side in the direction orthogonal to the optical axis from the position where the position is changed.
- the step is directed in the direction opposite to the optical axis” means a state as shown in FIG.
- the average value m of the absolute values of the diffraction orders of the diffracted light generated by the annular structure within the effective diameter of the objective lens according to the present invention is preferably a natural number of 2 or more.
- the average value m of the diffraction orders of the diffracted light generated by the ring structure within the effective diameter is the sum of the absolute values of the diffraction orders of the diffracted light generated most frequently at each step between the ring zones. It can be obtained by dividing by a number. More specifically, the average m of the absolute values of the diffraction orders of the diffracted light generated by the ring structure within the effective diameter can be obtained as follows.
- the axial chromatic aberration changes in the positive direction means that the axial chromatic aberration changes in the color developing direction when the light beam incident on the objective lens has a longer wavelength, as shown in FIG.
- the coloring direction is a direction from point A to point B as shown in FIG.
- Point A represents the axial chromatic aberration of the objective lens of the present invention at the reference wavelength
- point B represents the axial chromatic aberration of the objective lens of the present invention when the light beam incident on the objective lens has a longer wavelength.
- the axial chromatic aberration changes in the positive direction means that the focus position of the objective lens moves away from the objective lens when the light beam incident on the objective lens has a longer wavelength. That is, B in FIG. 3 is a position farther from the objective lens than A. Further, as shown in FIG. 3, the objective lens according to the present invention is preferably free from axial chromatic aberration and spherical aberration when the wavelength of the light beam is the design reference wavelength of the objective lens.
- the objective lens according to the present invention has a change in wavelength of a light beam incident on the objective lens by ⁇ (nm), a spherical aberration of the objective lens caused by the change in wavelength ⁇ , ⁇ SA ( ⁇ rms), and a change in wavelength ⁇ .
- ⁇ f mm
- the following equation (1) ⁇ 70 ⁇ ( ⁇ SA / ⁇ ) / ( ⁇ f / ⁇ ) ⁇ ⁇ 20
- ⁇ f / ⁇ and ⁇ SA / ⁇ are expressed by the following equations (2) and (3), 0.00028 ⁇ ⁇ f / ⁇ ⁇ 0.0005 (2) ⁇ 0.02 ⁇ ⁇ SA / ⁇ ⁇ ⁇ 0.006 (3) It is preferable to satisfy.
- the objective lens according to the present invention has an optical path difference added to the wavefront passing through the objective lens as a function of the height h (mm) from the optical axis, due to the annular structure.
- ⁇ b C 2 ⁇ h 2 + C 4 ⁇ h 4 + C 6 ⁇ h 6 + ⁇ (However, C 2, C 4, C 6, respectively .... secondary, fourth, sixth, and is the optical path difference function coefficients ...) in the optical path difference function [Phi b defined by Table when, it is preferable that the second-order optical path difference function coefficient C 2 is positive.
- the temperature change amount of the optical pickup device is ⁇ T and the spherical aberration of the objective lens generated due to the temperature change ⁇ T is ⁇ SA ′, ⁇ 0.00097 ⁇ ⁇ SA ′ / ⁇ T ⁇ 0.0016 (4) It is preferable to satisfy.
- ⁇ f / ⁇ and ⁇ SA / ⁇ have the following expressions (5) and (6): 0.0003 ⁇ ⁇ f / ⁇ ⁇ 0.0004 (5) ⁇ 0.015 ⁇ ⁇ SA / ⁇ ⁇ ⁇ 0.006 (6) It is preferable to satisfy.
- the temperature characteristics can be further improved. Therefore, in order to improve the temperature characteristics of the optical pickup device, when the optical element in the optical system of the optical pickup device is controlled by the actuator, the movable amount of the actuator can be reduced. Therefore, the size of the actuator can be reduced, and the configuration of the optical pickup device can be simplified.
- the objective lens according to the present invention has the absolute value of the diffraction order of the diffracted light generated by the annular structure (A, B, C, G in FIG. 1) formed on the inner side in the optical axis orthogonal direction than the return of the objective lens.
- the average value is m1
- the total number of ring zones of the ring zone structure formed inside the optical axis orthogonal direction with respect to the return of the objective lens is M1
- the focal length of the objective lens is f (mm)
- the following (7 )formula 2.8 ⁇ (m1 ⁇ M1) /f ⁇ 6.9 (7) It is preferable to satisfy.
- the objective lens according to the present invention is an average value of absolute values of diffraction orders of diffracted light generated by an annular structure (D, E, F in FIG. 1) formed on the outer side in the optical axis orthogonal direction with respect to the return of the objective lens.
- m2 is M2
- the total number of ring zones of the ring zone structure outside the optical axis orthogonal to the optical axis orthogonal direction is M2
- the focal length of the objective lens is f (mm)
- the following equation (8) 35 ⁇ (m2 ⁇ M2) / f ⁇ 93 (8) It is preferable to satisfy.
- m is the average absolute value of the diffraction orders of diffracted light generated by the annular structure within the effective diameter of the objective lens
- M is the total number of the annular zones of the objective lens
- the focal point of the objective lens 38 ⁇ (m ⁇ M) / f ⁇ 100 (9) It is preferable to satisfy.
- the objective lens according to the present invention has the following expression (10), where NA ′ is the image-side numerical aperture at which the direction of the step changes on the optical surface of the objective lens in which the annular structure is formed: 0.41 ⁇ NA ′ ⁇ 0.56 (10) It is preferable to satisfy.
- the image-side numerical aperture at which the direction of the step changes is NA ′.
- the present invention it is possible to reduce the shift of the best focus position that occurs when the oscillation wavelength of the laser light changes. Therefore, it is possible to perform good reproduction or recording on the optical disc. In particular, during recording, the wavelength change is likely to occur as the output of the laser beam increases, so the effect of the present invention becomes more remarkable.
- FIG. It is a figure which shows the state which the level
- the schematic which shows the spherical aberration in the reference wavelength of the objective lens of this invention, and the spherical aberration of the objective lens of this invention when a wavelength changes to a long wavelength.
- the schematic which shows an example of the optical pick-up apparatus of this invention.
- FIG. 6 is an optical path diagram related to Example 2.
- FIG. 6 is an optical path diagram related to Example 3.
- FIG. 10 is an optical path diagram related to Example 4.
- FIG. 6 is an optical path diagram regarding Comparative Example 1.
- FIG. 10 is an optical path diagram for Comparative Example 2.
- FIG. 10 is an optical path diagram for Comparative Example 3.
- FIG. 10 is an optical path diagram for Comparative Example 4.
- FIG. It is a figure which shows the under and over of spherical aberration.
- FIG. 4 is a diagram schematically showing an example of the configuration of the optical pickup apparatus PU1 of the present embodiment that can appropriately record and / or reproduce information on the BD.
- Such an optical pickup device PU1 can be mounted on an optical information recording / reproducing device.
- the present invention is not limited to the present embodiment.
- the optical pickup device PU1 emits light when recording / reproducing information with respect to the objective lens OBJ, the ⁇ / 4 wavelength plate QWP, the collimating lens CL movable in the optical axis direction, and the polarization beam splitter BS, BD, and the wavelength ⁇ 1.
- a first semiconductor laser LD1 (first light source) that emits a laser beam (first beam) of 405 nm, a sensor lens SEN, a light receiving element PD1 as a photodetector, and the like.
- the single objective lens OBJ according to the present embodiment is composed of a plurality of annular zones, and the annular zones formed so that adjacent annular zones have a predetermined optical path difference with respect to incident light.
- the annular structure is a folded structure in which the direction of the step is changed at least once within the effective diameter.
- the objective lens of the present embodiment is a plastic lens.
- the linearly polarized light is converted into circularly polarized light by the four-wavelength plate QWP, the diameter of the light flux is regulated by the stop AP, and the light enters the objective lens OBJ.
- the light beam condensed by the objective lens OBJ becomes a spot formed on the information recording surface RL1 of the BD via the protective substrate PL1 having a thickness of 0.1 mm.
- the reflected light beam modulated by the information pits on the information recording surface RL1 is transmitted again through the objective lens OBJ and the aperture AP, and then converted from circularly polarized light to linearly polarized light by the ⁇ / 4 wavelength plate QWP, and converged by the collimating lens CL.
- the output signal of the light receiving element PD to focus or track the objective lens OBJ by the biaxial actuator AC1
- information recorded on the BD can be read.
- spherical aberration that occurs due to a temperature change or due to a different information recording layer is generated by using a collimator lens CL as a magnification changing means by means of an actuator AC2. It can be corrected by changing in the axial direction and changing the divergence angle or convergence angle of the light beam incident on the objective optical element OBJ. Further, when wavelength variation occurs in the first light flux, the collimator lens CL may be moved in the optical axis direction.
- a power of 10 (for example, 2.5 ⁇ 10 ⁇ 3 ) may be expressed using E (for example, 2.5 ⁇ E ⁇ 3).
- the optical surface of the objective lens is formed as an aspherical surface that is symmetric about the optical axis and is defined by a mathematical formula in which the coefficients shown in Table 1 are substituted into Formula 1.
- X (h) is an axis in the optical axis direction (the light traveling direction is positive)
- ⁇ is a conical coefficient
- Ai is an aspherical coefficient
- h is a height from the optical axis
- r is a paraxial radius of curvature. It is.
- the optical path difference given to the light flux of each wavelength by the diffractive structure is defined by an equation in which the coefficient shown in the table is substituted into the optical path difference function of Formula 2. .
- ⁇ is the wavelength of the incident light beam
- ⁇ B is the manufacturing wavelength (blazed wavelength)
- dor is the diffraction order
- C i is the coefficient of the optical path difference function.
- the lens data of Examples 1 to 4 are shown in Tables 1 to 4, respectively.
- Tables 5 to 8 show lens data of Comparative Examples 1 to 4, which are normal lenses having no annular structure.
- Tables 9 and 10 show lists of Examples 1 to 4 and Comparative Examples 1 to 4.
- a cyclic olefin resin material is used for the lenses of Examples 1 to 4 and Comparative Examples 1 to 4.
- the reversal ring zone refers to a ring zone that is switched like G in FIG.
- the temperature characteristics ⁇ SA ′ in Tables 9 and 10 are values of spherical aberration generated when the temperature of the optical pickup device changes by 30 ° C.
- the average value m2 of the diffraction order of the diffracted light generated by the annular structure formed outside the direction orthogonal to the optical axis is the absolute value of the diffraction order of the diffracted light generated by the annular structure within the effective diameter of the objective lens. Of the same order as the average value m.
- the objective lenses of the present invention shown in Examples 1 to 4 are ⁇ f / ⁇ with respect to each normal lens having no annular structure shown in Comparative Examples 1 to 4.
- the axial chromatic aberration changes in the positive direction when the light beam incident on the objective lens has a longer wavelength.
- the value of ⁇ SA / ⁇ is a negative value, that is, when the light beam incident on the objective lens has a longer wavelength, spherical aberration Is under.
- chromatic aberration (focus position shift) generated when the wavelength of the light beam is changed as compared with the respective normal lenses shown in Comparative Examples 1 to 4.
- the absolute value of the spherical aberration generated when the temperature is changed is smaller than that of each of the normal lenses shown in Comparative Examples 1 to 4. That is, it is possible to improve the temperature characteristics.
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Optical Head (AREA)
- Lenses (AREA)
Abstract
Description
-70≦(ΔSA/Δλ)/(Δf/Δλ)≦-20 (1)
ここで、Δλ(nm)は波長の変化量、ΔSA(λrms)は波長の変化Δλに起因して発生する対物レンズの球面収差、Δf(mm)は波長の変化Δλに起因して発生する対物レンズの軸上色収差を表す。
Φb=C2・h2+C4・h4+C6・h6+・・・・
(ただし、C2、C4、C6、・・・・はそれぞれ2次、4次、6次、・・・・の光路差関数係数である)により定義される光路差関数Φbで表したとき、2次の光路差関数係数C2が正であり、前記対物レンズに入射する光束の波長をより長い波長とした場合に、球面収差がアンダーとなることを特徴とする。
0.00028≦Δf/Δλ≦0.0005 (2)
-0.02≦ΔSA/Δλ≦-0.006 (3)
但し、球面収差ΔSAの符号は、オーバー(補正過剰)方向に変化する場合を「+」、アンダー(補正不足)方向に変化する場合を「-」とする。
-0.00097≦ΔSA′/ΔT≦0.0016 (4)
を満たすことを特徴とする。
0.0003≦Δf/Δλ≦0.0004 (5)
-0.015≦ΔSA/Δλ≦-0.006 (6)
を満たすことを特徴とする。
2.8≦(m1・M1)/f≦6.9 (7)
を満たすことを特徴とする。
35≦(m2・M2)/f≦93 (8)
を満たすことを特徴とする。
38≦(m・M)/f≦100 (9)
を満たすことを特徴とする。
0.41≦NA′≦0.56 (10)
を満たすことを特徴とする。
0.9≦d/f≦1.8 (11)
を満たすことを特徴とする。
0mm<t≦0.125mm (a)
好ましくは、以下の条件式(a)’、
0.075mm≦t≦0.125mm (a)’
を満たすことが好ましい。
次に、第2の好ましい例は、少なくとも炭素原子数2~20のα-オレフィンと下記一般式(IV)で表される環状オレフィンからなる単量体組成物とを付加重合させることにより得られる重合体(A)と、炭素原子数2~20のα-オレフィンと下記一般式(V)で表される環状オレフィンからなる単量体組成物とを付加重合させることにより得られる重合体(B)とを含む樹脂組成物である。
樹脂材料に更なる性能を付加するために、以下のような添加剤を添加してもよい。
フェノール系安定剤、ヒンダードアミン系安定剤、リン系安定剤及びイオウ系安定剤から選ばれた少なくとも1種の安定剤を添加することが好ましい。これらの安定剤を適宜選択し添加することで、例えば、405nmといった短波長の光を継続的に照射した場合の白濁や、屈折率の変動等の光学特性変動をより高度に抑制することができる。
界面活性剤は、同一分子中に親水基と疎水基とを有する化合物である。界面活性剤は樹脂表面への水分の付着や上記表面からの水分の蒸発の速度を調節することで、樹脂組成物の白濁を防止することが可能となる。
可塑剤は共重合体のメルトインデックスを調節するため、必要に応じて添加される。
-70≦(ΔSA/Δλ)/(Δf/Δλ)≦-20 (1)
を満たす。
0.00028≦Δf/Δλ≦0.0005 (2)
-0.02≦ΔSA/Δλ≦-0.006 (3)
を満たすことが好ましい。
Φb=C2・h2+C4・h4+C6・h6+・・・・
(ただし、C2、C4、C6、・・・・はそれぞれ2次、4次、6次、・・・・の光路差関数係数である)により定義される光路差関数Φbで表したとき、2次の光路差関数係数C2が正であることが好ましい。2次の光路差関数係数C2を正にすることにより、対物レンズに入射する光束をより長い波長にした場合に、軸上色収差を正の方向へ変化させることが可能となる。
-0.00097≦ΔSA′/ΔT≦0.0016 (4)
を満たすことが好ましい。
-0.00097≦ΔSA′/ΔT≦0.0015 (4)′
を満たすと、より好ましい。
0.0003≦Δf/Δλ≦0.0004 (5)
-0.015≦ΔSA/Δλ≦-0.006 (6)
を満たすことが好ましい。
0.00031≦Δf/Δλ≦0.00037 (5)′
-0.012≦ΔSA/Δλ≦-0.008 (6)′
を満たすと、より好ましい。
2.8≦(m1・M1)/f≦6.9 (7)
を満たすことが好ましい。
35≦(m2・M2)/f≦93 (8)
を満たすことが好ましい。
38≦(m・M)/f≦100 (9)
を満たすことが好ましい。
0.41≦NA′≦0.56 (10)
を満たすことが好ましい。
0.9≦d/f≦1.8 (11)
を満たすことが好ましい。
0.9≦d/f≦1.5 (12)
を満たすと、より好ましい。
Claims (15)
- 波長λ(390nm≦λ≦420nm)の光束を出射する光源と、前記光源から出射された光束を厚さt(0mm<t≦0.125mm)の保護基板を介して光ディスクの情報記録面に集光させるための対物レンズを含む集光光学系とを有し、前記集光光学系が、前記光源からの光束を、光ディスクの情報記録面に集光させることによって、情報の記録及び/又は再生を行う光ピックアップ装置に用いられる対物レンズであって、
前記対物レンズの像側開口数は0.75以上であり、
前記対物レンズは、複数の輪帯から構成され、かつ、隣り合う輪帯同士が、入射光に対して所定の光路差を生じるように形成された輪帯構造を、少なくとも1つの光学面上に有し、前記輪帯構造は、段差の向きが有効径内で少なくとも一度入れ替わる折り返し構造となっており、
以下の(1)式を満たすことを特徴とする対物レンズ。
-70≦(ΔSA/Δλ)/(Δf/Δλ)≦-20 (1)
ここで、Δλ(nm)は波長の変化量、ΔSA(λrms)は波長の変化Δλに起因して発生する対物レンズの球面収差、Δf(mm)は波長の変化Δλに起因して発生する対物レンズの軸上色収差を表す。 - 前記対物レンズに入射する光束をより長い波長とした場合に、軸上色収差が正の方向へ変化し、発生する球面収差がアンダーとなることを特徴とする請求項1に記載の対物レンズ。
- 前記輪帯構造により、前記対物レンズを通過する波面に付加される光路差を、光軸からの高さh(mm)の関数として、
Φb=C2・h2+C4・h4+C6・h6+・・・・
(ただし、C2、C4、C6、・・・・はそれぞれ2次、4次、6次、・・・・の光路差関数係数である)により定義される光路差関数Φbで表したとき、2次の光路差関数係数C2が正であり、
前記対物レンズに入射する光束の波長をより長い波長とした場合に、球面収差がアンダーとなることを特徴とする請求項1又は2に記載の対物レンズ。 - 前記Δf/Δλと前記ΔSA/Δλが以下の(2)式と(3)式を満たすことを特徴とする請求項1から3までの何れか一項に記載の対物レンズ。
0.00028≦Δf/Δλ≦0.0005 (2)
-0.02≦ΔSA/Δλ≦-0.006 (3) - 前記光ピックアップ装置の温度変化量をΔTとし、前記温度変化量ΔTに起因して発生する対物レンズの球面収差をΔSA′としたときに、以下の(4)式を満たすことを特徴とする請求項1から4までの何れか一項に記載の対物レンズ。
-0.00097≦ΔSA′/ΔT≦0.0016 (4) - 前記Δf/Δλと前記ΔSA/Δλが以下の(5)式と(6)式を満たすことを特徴とする請求項1から5までの何れか一項に記載の対物レンズ。
0.0003≦Δf/Δλ≦0.0004 (5)
-0.015≦ΔSA/Δλ≦-0.006 (6) - 前記対物レンズの折り返し部よりも光軸直交方向内側に形成された前記輪帯構造によって発生する回折光の回折次数の絶対値の平均値をm1とし、前記対物レンズの前記折り返し部よりも光軸直交方向内側に形成された前記輪帯構造の輪帯の総数をM1、前記対物レンズの焦点距離をf(mm)としたとき、以下の(7)式を満たすことを特徴とする請求項1から6までの何れか一項に記載の対物レンズ。
2.8≦(m1・M1)/f≦6.9 (7) - 前記対物レンズの前記折り返し部よりも光軸直交方向外側に形成された前記輪帯構造によって発生する回折光の回折次数の絶対値の平均値をm2とし、前記対物レンズの前記折り返し部よりも光軸直交方向外側の前記輪帯構造の輪帯の総数をM2、前記対物レンズの焦点距離をf(mm)としたとき、以下の(8)式を満たすことを特徴とする請求項1から7までの何れか一項に記載の対物レンズ。
35≦(m2・M2)/f≦93 (8) - 前記対物レンズの有効径内の前記輪帯構造によって発生する回折光の回折次数の絶対値の平均値をmとし、前記対物レンズの輪帯の総数をM、前記対物レンズの焦点距離をf(mm)としたとき、以下の(9)式を満たすことを特徴とする請求項1から8までの何れか一項に記載の対物レンズ。
38≦(m・M)/f≦100 (9) - 前記輪帯構造が形成された前記対物レンズの光学面上で、段差の向きが入れ替わる像側開口数をNA′としたときに、以下の(10)式を満たすことを特徴とする請求項1から9までの何れか一項に記載の対物レンズ。
0.41≦NA′≦0.56 (10) - 前記対物レンズの有効径内の前記輪帯構造によって発生する回折光の回折次数の絶対値の平均値mが2以上の自然数であることを特徴とする請求項1から10までの何れか一項に記載の対物レンズ。
- 前記対物レンズの光軸上の厚さをd(mm)としたときに、以下の(11)式を満たすことを特徴とする請求項1から11までの何れか一項に記載の対物レンズ。
0.9≦d/f≦1.8 (11) - 前記対物レンズは、プラスチックレンズであることを特徴とする請求項1から12までの何れか一項に記載の対物レンズ。
- 請求項1から13までの何れか一項に記載の対物レンズを搭載したことを特徴とする光ピックアップ装置。
- 請求項14に記載の光ピックアップ装置を備えたことを特徴とする光情報記録再生装置。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2010800407751A CN102498517A (zh) | 2009-09-18 | 2010-08-27 | 物镜、光拾取装置及光信息记录再生装置 |
JP2011531870A JPWO2011033919A1 (ja) | 2009-09-18 | 2010-08-27 | 対物レンズ、光ピックアップ装置及び光情報記録再生装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009217414 | 2009-09-18 | ||
JP2009-217414 | 2009-09-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011033919A1 true WO2011033919A1 (ja) | 2011-03-24 |
Family
ID=43758528
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2010/064583 WO2011033919A1 (ja) | 2009-09-18 | 2010-08-27 | 対物レンズ、光ピックアップ装置及び光情報記録再生装置 |
Country Status (3)
Country | Link |
---|---|
JP (1) | JPWO2011033919A1 (ja) |
CN (1) | CN102498517A (ja) |
WO (1) | WO2011033919A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013027622A1 (ja) * | 2011-08-22 | 2013-02-28 | コニカミノルタアドバンストレイヤー株式会社 | 対物レンズ及び光ピックアップ装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004185797A (ja) * | 2002-11-21 | 2004-07-02 | Konica Minolta Holdings Inc | 光ピックアップ装置用光学系、光ピックアップ装置及び対物レンズ |
JP2008269786A (ja) * | 2007-03-28 | 2008-11-06 | Konica Minolta Opto Inc | 光ピックアップ装置及び光ピックアップ装置用の対物光学素子 |
JP2010040073A (ja) * | 2008-08-01 | 2010-02-18 | Hitachi Maxell Ltd | 光ピックアップ光学系 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW200502670A (en) * | 2002-11-21 | 2005-01-16 | Konica Minolta Holdings Inc | Objective lens, optical system and optical pickup apparatus |
US7408866B2 (en) * | 2003-02-14 | 2008-08-05 | Konica Minolta Holdings, Inc. | Objective lens for optical pickup apparatus, optical pickup apparatus and optical information recording reproducing apparatus |
JP2009104747A (ja) * | 2007-10-25 | 2009-05-14 | Hitachi Maxell Ltd | ピックアップ対物レンズ及びピックアップ対物レンズの設計方法 |
-
2010
- 2010-08-27 WO PCT/JP2010/064583 patent/WO2011033919A1/ja active Application Filing
- 2010-08-27 CN CN2010800407751A patent/CN102498517A/zh active Pending
- 2010-08-27 JP JP2011531870A patent/JPWO2011033919A1/ja active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004185797A (ja) * | 2002-11-21 | 2004-07-02 | Konica Minolta Holdings Inc | 光ピックアップ装置用光学系、光ピックアップ装置及び対物レンズ |
JP2008269786A (ja) * | 2007-03-28 | 2008-11-06 | Konica Minolta Opto Inc | 光ピックアップ装置及び光ピックアップ装置用の対物光学素子 |
JP2010040073A (ja) * | 2008-08-01 | 2010-02-18 | Hitachi Maxell Ltd | 光ピックアップ光学系 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013027622A1 (ja) * | 2011-08-22 | 2013-02-28 | コニカミノルタアドバンストレイヤー株式会社 | 対物レンズ及び光ピックアップ装置 |
Also Published As
Publication number | Publication date |
---|---|
CN102498517A (zh) | 2012-06-13 |
JPWO2011033919A1 (ja) | 2013-02-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4636213B2 (ja) | 対物レンズ、光ピックアップ装置及び光情報記録再生装置 | |
WO2011033919A1 (ja) | 対物レンズ、光ピックアップ装置及び光情報記録再生装置 | |
WO2013047202A1 (ja) | 対物レンズ及び光ピックアップ装置 | |
WO2011136096A1 (ja) | 光ピックアップ装置用の対物レンズ、光ピックアップ装置及び光情報記録再生装置 | |
WO2011132691A1 (ja) | 光ピックアップ装置用の対物レンズ、光ピックアップ装置及び光情報記録再生装置 | |
WO2012111554A1 (ja) | 対物レンズ及び光ピックアップ装置 | |
JP5152439B2 (ja) | 光ピックアップ装置用の対物レンズ及び光ピックアップ装置 | |
WO2012036052A1 (ja) | 光ピックアップ装置用の対物レンズ、光ピックアップ装置及び光情報記録再生装置 | |
WO2013146267A1 (ja) | 対物レンズ及び光ピックアップ装置 | |
JP5585879B2 (ja) | 光ピックアップ装置及び光情報記録再生装置 | |
JP5093634B2 (ja) | 光ピックアップ装置用の対物レンズ及び光ピックアップ装置 | |
JP5229657B2 (ja) | 光ピックアップ装置用の対物レンズ、光ピックアップ装置及び光情報記録再生装置 | |
WO2011065276A1 (ja) | 光ピックアップ装置用の対物レンズ及び光ピックアップ装置 | |
WO2013121615A1 (ja) | 光ピックアップ装置用の対物レンズ及び光ピックアップ装置 | |
WO2012133363A1 (ja) | 光ピックアップ装置用の対物レンズ、光ピックアップ装置及び光情報記録再生装置 | |
WO2013084558A1 (ja) | 光ピックアップ装置用の対物レンズ、光ピックアップ装置及び光情報記録再生装置 | |
WO2013027622A1 (ja) | 対物レンズ及び光ピックアップ装置 | |
WO2011078022A1 (ja) | 光ピックアップ装置用の対物レンズ及び光ピックアップ装置 | |
WO2012063847A1 (ja) | 光ピックアップ装置用の対物レンズ、光ピックアップ装置及び光情報記録再生装置 | |
WO2013168692A1 (ja) | 対物レンズ及び光ピックアップ装置 | |
WO2012063850A1 (ja) | 光ピックアップ装置用の対物レンズ、光ピックアップ装置及び光情報記録再生装置 | |
WO2013147014A1 (ja) | 対物レンズ、光ピックアップ装置及び光情報記録再生装置 | |
WO2011132696A1 (ja) | 光ピックアップ装置用の対物レンズ、光ピックアップ装置及び光情報記録再生装置 | |
WO2013114662A1 (ja) | 光ピックアップ装置用の対物レンズ及び光ピックアップ装置 | |
WO2012147606A1 (ja) | 光ピックアップ装置用の対物レンズ、光ピックアップ装置及び光情報記録再生装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 201080040775.1 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 10817032 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2011531870 Country of ref document: JP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 10817032 Country of ref document: EP Kind code of ref document: A1 |