WO2007132833A1 - Lentille composite et procédé de production de cette dernière - Google Patents

Lentille composite et procédé de production de cette dernière Download PDF

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Publication number
WO2007132833A1
WO2007132833A1 PCT/JP2007/059923 JP2007059923W WO2007132833A1 WO 2007132833 A1 WO2007132833 A1 WO 2007132833A1 JP 2007059923 W JP2007059923 W JP 2007059923W WO 2007132833 A1 WO2007132833 A1 WO 2007132833A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
positioning
optical axis
compound
positioning portion
Prior art date
Application number
PCT/JP2007/059923
Other languages
English (en)
Japanese (ja)
Inventor
Toshiaki Takano
Jun Murata
Original Assignee
Panasonic Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Corporation filed Critical Panasonic Corporation
Priority to JP2008515556A priority Critical patent/JPWO2007132833A1/ja
Publication of WO2007132833A1 publication Critical patent/WO2007132833A1/fr

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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
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
    • G02B27/4205—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive optical element [DOE] contributing to image formation, e.g. whereby modulation transfer function MTF or optical aberrations are relevant
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
    • G02B27/4233—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive element [DOE] contributing to a non-imaging application
    • G02B27/4238—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect having a diffractive element [DOE] contributing to a non-imaging application in optical recording or readout devices
    • 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
    • G02B5/189—Structurally combined with optical elements not having diffractive power
    • G02B5/1895—Structurally combined with optical elements not having diffractive power such optical elements having dioptric power

Definitions

  • the present invention relates to a compound lens and a method for manufacturing the same, and to a compound lens in which a second lens unit is joined to a first lens unit and a method for manufacturing the same.
  • Patent Document 1 a diffractive surface is formed on the joint surface or the surface of the composite optical element, and the composite optical element having such a diffractive surface is molded using the methods disclosed in Patent Documents 2 and 3.
  • Patent Document 1 Japanese Patent Laid-Open No. 11-337818
  • Patent Document 2 JP 2004-126392 A
  • Patent Document 3 Japanese Patent Application Laid-Open No. 2004-240417
  • the second lens unit is bonded to the first lens unit so that the optical axes coincide with each other! Otherwise, there is a risk of deteriorating the optical characteristics of the compound lens.
  • the present invention has been made in view of efforts, and an object of the present invention is to provide a composite lens capable of improving optical characteristics and a method for manufacturing the same. Means for solving the problem
  • Each of the first, second, and third compound lenses of the present invention includes a first lens unit having a first lens surface, and a second lens unit joined to the first lens unit on the first lens surface. It is equipped with.
  • a first positioning portion exists on the first lens surface.
  • the second lens unit has a second lens surface opposite to the first cemented surface where the second lens unit is cemented to the first lens unit, and the second lens surface includes a second lens surface.
  • a positioning part exists.
  • the first positioning portion is present at least on a straight line that is substantially parallel to the optical axis and passes through the second positioning portion.
  • the first position on the straight line passing through the second positioning portion does not have to be completely overlapped with the second positioning portion in the optical axis direction.
  • the second positioning part does not have to exist on a straight line passing through the first positioning part.
  • the first positioning part is formed in a ring shape centered on one point on the optical axis of the first lens part, and the second positioning part is centered on one point on the optical axis of the second lens part. And it may exist on a part of the circumference existing on the second lens surface.
  • a first positioning portion exists on the first lens surface.
  • the second lens unit has a second lens surface opposite to the first cemented surface where the second lens unit is cemented to the first lens unit, and the second lens surface includes a second lens surface.
  • a positioning part exists.
  • the second positioning portion is present at least on a straight line that is substantially parallel to the optical axis and passes through the first positioning portion.
  • the second position does not have to be completely overlapped with the first positioning portion in the optical axis direction.
  • Force for which the determining part exists The first positioning part does not have to exist on a straight line passing through the second positioning part.
  • the second positioning part is formed in a ring shape centered on one point on the optical axis of the second lens part, and the first positioning part is centered on one point on the optical axis of the first lens part. And may exist on a part of the circumference existing on the first lens surface.
  • the third compound lens there are two first and second positioning portions on the first and second lens surfaces, respectively.
  • the first optical unit has a third lens surface on the side opposite to the first lens surface, and the lens is positioned on the optical axis outside the lens with respect to the intersection of the third lens surface and the optical axis.
  • one of the two first positioning parts exists on a straight line that faces from the viewpoint to one of the two second positioning parts.
  • the other of the two lies on a straight line that faces from the viewpoint to the other of the two second positioning portions.
  • a second lens member is bonded to the first lens surface of the first lens member to manufacture a composite lens.
  • the first positioning part on the first lens surface Preparing the first lens member formed with (a), preparing the molding die for molding the second lens member (b), and the molten optical material used as the material of the second lens member A step (c) of setting a material on a molding die and pressing a first lens member on the set optical material.
  • a molding die having a molding surface for molding the second lens surface of the second lens member and a molding positioning portion formed on the molding surface is prepared.
  • step (c) the first positioning portion is overlapped with the molding positioning portion in a direction substantially parallel to the optical axis of the first lens member, the first lens surface is brought into contact with the optical material, 1Press the first lens member onto the optical material in a direction approximately parallel to the optical axis of the lens member.
  • FIG. 1 is a cross-sectional view of a compound lens according to Embodiment 1
  • FIG. 1B is a plan view of the downward force in FIG. is there.
  • FIG. 2 is a flowchart showing a method of molding a compound lens according to Embodiment 2 in (a) to (d).
  • FIG. 3 (a) is a cross-sectional view of the first and second positioning portions in Modification 1 of Embodiment 1, and FIG. 3 (b) shows the downward force in FIG. It is a top view.
  • FIG. 4 (a) is a cross-sectional view of another first and second positioning portion in Modification 1 of Embodiment 1, and FIG. 4 (b) shows the compound lens as well as the downward force in (a). It is a top view at the time.
  • FIG. 5 (a) is a cross-sectional view of still another first and second positioning portions in Modification 1 of Embodiment 1, and (b) is a view of the compound lens from below in (a). It is a plan view when
  • FIG. 6 (a) is a cross-sectional view of still another first and second positioning portions in Modification 1 of Embodiment 1, and (b) is a view of the compound lens from below in (a). It is a plan view when
  • FIG. 7 is a cross-sectional view of still another first and second positioning portions in Modification 1 of Embodiment 1, and (b) is a view of the compound lens from below in (a). It is a plan view when FIG. 8 is a cross-sectional view of a compound lens according to Modification 2 of Embodiment 1.
  • FIG. 9 is a cross-sectional view of a compound lens according to Modification 3 of Embodiment 1.
  • FIG. 10 is a cross-sectional view of a compound lens according to Modification 4 of Embodiment 1.
  • FIG. 11 is a cross-sectional view of a compound lens according to Modification 5 of Embodiment 1.
  • FIG. 12 (a) is a cross-sectional view of the compound lens according to Embodiment 2
  • FIG. 12 (b) is a plan view of the downward force compound lens in (a).
  • FIG. 13 (a) is a cross-sectional view of a compound lens according to Embodiment 3
  • FIG. 13 (b) is a plan view when the downward force in (a) is viewed from the compound lens.
  • FIG. 14 is a cross-sectional view of a compound lens according to Embodiment 4.
  • FIG. 15 is a cross-sectional view of a compound lens according to Embodiment 5.
  • FIG. 16 is a cross-sectional view of a compound lens according to Embodiment 6.
  • FIG. 17 is a cross-sectional view of a compound lens according to Embodiment 7.
  • FIG. 18 is a cross-sectional view of a compound lens that is effective in Embodiment 8.
  • FIG. 1 is a diagram illustrating a configuration of the compound lens 10 according to the first embodiment.
  • FIG. 1 (a) is a schematic sectional view
  • FIG. 1 (b) is a plan view of the compound lens 10 when the downward force in FIG. 1 (a) is also seen.
  • the compound lens 10 according to the present embodiment includes a first lens unit 11 and a second lens unit 14.
  • the first lens unit 11 is an aspheric lens made of glass, and has two lens surfaces, that is, a lens surface (first lens surface) 12 and a lens surface (third lens surface) 13.
  • the second lens unit 14 is made of grease and is bonded to the lens surface 12 of the first lens unit 11. Specifically, the second lens unit 14 is bonded to the lens surface 12 so that the optical axis thereof coincides with the optical axis of the first lens unit 11.
  • the compound lens 10 according to the present embodiment makes the optical axes coincide with each other. Compared with a compound lens that is joined without any problems, the optical characteristics (aberration, light transmittance, light condensing rate, etc.) of the compound lens can be improved.
  • a first positioning portion 12a exists on the lens surface 12 of the first lens portion 11.
  • the first positioning part 12 a indicates the position of the optical axis of the first lens part 11 on the lens surface 12, and exists on the optical axis of the first lens part 11.
  • the second lens portion 14 has a lens surface (second lens surface) 15 on the side opposite to the first cemented surface 16, and the lens surface 15 has a second positioning portion 15 a.
  • the second positioning portion 15 a indicates the optical axis position of the second lens portion 14 on the lens surface 15, and exists on the optical axis of the second lens portion 14.
  • the first positioning portion 12a and the second positioning portion 15a are arranged side by side. Thereby, in the compound lens 10, the second lens unit 14 is joined to the first lens unit 11 so that the optical axis thereof coincides with the optical axis of the first lens unit 11 without deviation.
  • the first and second positioning portions 12a, 15a are each convex in a semicircular cross section, and the most protruding portions are the optical axes of the first and second lens portions 12, 15, respectively.
  • the first and second positioning portions 12a and 15a are formed in sizes and positions that do not affect the optical characteristics, respectively. It is preferable. Specifically, it is preferable that the size of the first positioning portion 12a on the lens surface 12 of the first lens portion 11 is about 100 ⁇ m, and the depth of the first positioning portion 12a is about 100 ⁇ m. It is preferable. The same applies to the second positioning portion 15a.
  • an uneven surface portion (hereinafter referred to as “first uneven surface portion”) 15 b having a sawtooth cross section exists on the lens surface 15 of the second lens portion 14. Yes.
  • the first concave convex surface portion 15b is a diffractive portion, and is present outside the second positioning portion 15a, and is present in a ring shape centered on one point on the optical axis of the composite lens 10. That is, on the lens surface 15 of the second lens portion 14, as shown in FIG.
  • the optical power differs between the first concave / convex surface portion 15b and the smooth surface portion 15c. Therefore, for example, light having a wavelength is incident on the first concave / convex surface portion 15b to be condensed. The light of the wavelength ( ⁇ ⁇ ) is incident on the smooth surface 15c and condensed.
  • the optical axis of the first lens unit 11 and the optical axis of the second lens unit 14 are aligned with each other. Unlike bonded composite lenses, it has excellent optical properties. Further, in the compound lens 10 that is effective in the present embodiment, since the optical power is different between the first uneven surface portion 15b and the smooth surface portion 15c, two lights having different wavelengths can be emitted.
  • FIGS. 2A to 2D are schematic cross-sectional views showing a molding process of the compound lens 10 that is useful in the present embodiment.
  • the first lens member is molded through the steps shown in FIGS. 2 (a) and 2 (b), and then the FIGS. 2 (c) and 2 are used.
  • the second lens member is bonded to the first lens member, and the composite lens 10 is molded. Specific examples are shown below.
  • the glass preform 1 preferably has a shape very similar to the shape of the first lens part 11 after molding.
  • the molding apparatus includes an upper die 81 and a lower die 82.
  • the upper die 81 and the lower die 82 are Each has molding surfaces 81a and 83.
  • the molding surface 81a of the upper mold 81 is smoothly formed so as to correspond to the lens surface 13 of the first lens unit 11.
  • the molding surface 83 of the lower mold 82 is formed so as to correspond to the lens surface 12 of the first lens portion 11, and therefore, a concave portion 83a corresponding to the first positioning portion 12a is formed at the center of the surface.
  • the lower mold 82 is set with the molding surface 83 facing up
  • the glass preform 1 is set on the molding surface 83
  • the upper mold 81 is set on the glass preform 1 with the molding surface 81 a facing down.
  • the glass preform 1 is heated to near the glass softening temperature and pressed as shown in Fig. 2 (b), and the molding surfaces of the upper mold 81 and the lower mold 82 are respectively made of glass. Transfer to the surface of Preform 1.
  • the upper mold 81 may be pressed against the glass preform 1, and the lower mold 82 may be pressed against the glass preform 1, and the upper mold 81 and the lower mold 82 are pressed against the glass preform 1, respectively. Also good.
  • it is cooled. Accordingly, the first lens member that becomes the first lens portion 11 can be molded.
  • the first lens member is formed using the press molding method V, and unlike the case where the first lens member is formed using a polishing method or a grinding method, the first lens member is formed by a single molding. Even if the lens surface is aspherical or when the first positioning portion is formed on the lens surface, it can be molded relatively easily by processing the mold. .
  • the molding apparatus includes a lower mold (molding mold) 91, and the lower mold 91 has a molding surface 92.
  • the molding surface 92 is formed so as to correspond to the lens surface 15 of the second lens portion 14, and therefore, a concave molding positioning portion 92a is provided at the center of the surface so as to correspond to the second positioning portion 15a.
  • a convex concave portion 92b is formed on the outer side of the molding positioning portion 92a so as to correspond to the first concave and convex surface portion 15b, and the outer side of the convex concave portion 92b is formed smoothly. .
  • the molten resin preform 4 is set on the molding surface 92 and the first lens member is set on the resin preform 4.
  • the first lens member is set on the lower mold 91 so that the molding positioning portion 92a overlaps the first positioning portion 12a in the optical axis direction of the first lens member.
  • the compound lens 10 can be molded by aligning the optical axis of the first lens member with the central axis of the molding surface 92.
  • the shape of the lens surface of the first lens member does not change even if the first lens member is pressed against the resin preform 4. Further, since the second glass preform 4 flows in accordance with the shape of the lens surface 12 and enters the uneven portion 92b of the molding surface 92, the shape of the uneven portion 92b is suitably transferred to the surface of the second glass preform 4. The In this way, the compound lens 10 which is effective in the present embodiment can be molded.
  • the first lens member is mounted on the lower mold so that the optical axis of the first lens member coincides with the central axis of the molding surface 92. Therefore, the compound lens 10 can be molded by aligning the optical axis of the first lens member with the optical axis of the second lens member.
  • Such a compound lens 10 can be mounted on an optical device such as an imaging device, an illumination device, and an optical disk recording / reproducing device.
  • the imaging device is a device for photographing a subject, for example, a digital still camera or a digital video camera.
  • the illumination device is a device for irradiating light to an object to be illuminated, for example, a projector.
  • Optical disc recording / playback devices record digital versatile discs (hereinafter referred to as DVDs), compact discs (hereinafter referred to as CDs), Blu-ray discs (registered trademarks, hereinafter referred to as BDs (registered trademarks)), and the like. It is a device for playback.
  • DVD, CD, and BD registered trademark
  • DVD, CD, and BD registered trademark
  • an optical disk recording / reproducing apparatus compatible with multiple types of information recording media is realized. can do.
  • first and second positioning portions are not limited to the above description, and may be the shapes shown in a first modification described later.
  • shape of the compound lens and the shape of the first uneven surface portion are not limited to the above description, and may be shapes shown in second to fourth modifications described later.
  • FIGS. 3 through 7 Both are diagrams showing other shapes of the second positioning portion.
  • (a) is a view showing a cross section of the second positioning portion
  • (b) is a plan view of the lens surface force of the second lens portion as viewed from the second positioning portion.
  • the description of the first positioning portion is omitted in order to avoid complication of the drawings. Therefore, the description of the first positioning portion is also omitted in the following.
  • the second positioning portion 115a may be formed in a triangular cross section.
  • the second positioning portion 125a may be a cross formed on the lens surface 125. At this time, it is preferable that the intersection of the cross exists on the optical axis of the second lens portion 124.
  • the second positioning portion may be formed in a concave shape.
  • the second positioning portion 135a is formed in a concave shape having a semicircular cross section.
  • the second positioning portion 145a is formed in a concave shape having a triangular cross section.
  • the second positioning portion 155a is a convex cross formed on the lens surface 154, but the second positioning portion 155a shown in FIGS. 4 (a) and (b) 2 Unlike the positioning part 125a, the cross shafts have different lengths.
  • the second positioning portion 155a is asymmetric with respect to the optical axis of the second lens portion 154, the second positioning portion 155a indicates the xy direction in the second lens surface 155 of the second lens portion 154, As a result, the second lens member can be joined to the first lens member by matching the xy directions in the lens surface.
  • FIG. 8 is a schematic cross-sectional view of a compound lens 210 that works on the second modification of the first embodiment.
  • the first lens portion 211 has a flat plate shape
  • the first uneven surface portion 215b of the second lens portion 214 has a plurality of uneven portions having a stepped cross section.
  • the first concavo-convex surface portion 215b is a diffractive portion formed on the lens surface 215 opposite to the first joint surface 216, as in the first embodiment.
  • the first and second positioning portions 212a and 215a described in the first embodiment are formed in the compound lens 210 according to this modification. That is, the first positioning portion 212a is formed on the lens surface 212 of the first lens portion 211, and is on the optical axis of the first lens portion 211. Existing. Further, the second positioning portion 215a is formed on the lens surface 215 of the second lens portion 214, and exists on the optical axis of the second lens portion 214. The first positioning unit 212a and the second positioning unit 215a are arranged side by side in the optical axis direction.
  • FIG. 9 is a schematic cross-sectional view of a compound lens 220 that works on the third modification of the first embodiment.
  • the compound lens 220 that is effective in this modified example has a structure that is very similar to the compound lens 210 described in the second modified example.
  • the first uneven surface portion 225b of the second lens portion 224 is a lens array portion. . Specifically, a plurality of concave lenses are arranged on the first uneven surface portion 225b.
  • the first uneven surface portion 225b is formed on the lens surface 225 of the second lens portion 224 as in the first embodiment, and the lens surface 225 exists on the opposite side of the first joint surface 226. Further, the first and second positioning forces 222a and 225a described in the first embodiment are formed on the compound lens 220.
  • FIG. 10 is a schematic cross-sectional view of a compound lens 230 that works on the fourth modification of the first embodiment.
  • the compound lens 230 that is useful in this modification has a configuration similar to that of the compound lens 10 described in the first embodiment, but the first uneven surface portion 235a of the second lens portion 234 is a phase step portion. Specifically, a plurality of phase step surfaces having a stepped cross section are formed on the first uneven surface portion 235a.
  • the first uneven surface portion 235a is formed on the lens surface 235 of the second lens portion 234 as in the first embodiment, and the lens surface 235 exists on the opposite side of the first joint surface 236.
  • the composite lens 230 is formed with the first and second positioning portions 12a and 235a described in the first embodiment.
  • FIG. 11 is a schematic cross-sectional view of a compound lens 240 that works on the fifth modification of the first embodiment.
  • the compound lens 240 that works well with the present modification has a configuration similar to that of the compound lens 10 described in the first embodiment, but the first uneven surface portion 245a of the second lens portion 244 is an antireflection portion. Specifically, a plurality of cone-shaped projections are formed on the first uneven surface portion 245a, and the cone-shaped projections are arranged at a pitch equal to or less than the wavelength of the light to be reflected.
  • the first uneven surface portion 245a is the lens surface of the second lens portion 244 as in the first embodiment.
  • the lens surface 245 exists on the opposite side of the first joint surface 246. Further, the first and second positioning l2a and 245a forces described in the first embodiment are formed on the compound lens 240.
  • FIG. 12 is a diagram illustrating a configuration of the compound lens 20 according to the second embodiment.
  • FIG. 12 (a) is a schematic sectional view thereof
  • FIG. 12 (b) is a plan view of the compound lens 20 as viewed from below in FIG. 12 (a).
  • the positions and shapes of the first and second positioning portions 22a and 25a are different from those of the complex lens 10 of the first embodiment.
  • the first positioning portion 22a exists on the first lens surface 22, and is a ring centered on one point on the optical axis of the first lens portion 21. It is formed in a shape.
  • the second positioning portion 25a is the second lens surface 25 and is present outside the first uneven surface portion 25b, and is formed in a ring shape centered on one point on the optical axis of the second lens portion 24. ing.
  • This ring diameter is substantially the same as the ring diameter of the first positioning portion 22a.
  • the first positioning unit 25a overlaps the second positioning unit 22a in the optical axis direction of the compound lens. Even with such a compound lens 20, when the second lens member is joined to the first lens member, the optical axes can be joined together.
  • FIG. 13 is a diagram illustrating a configuration of the compound lens 30 according to the third embodiment.
  • FIG. 13 (a) is a schematic sectional view thereof
  • FIG. 13 (b) is a plan view of the compound lens 30 as viewed from below in FIG. 13 (a).
  • the positions and shapes of the first and second positioning portions 32a and 35a are different from those of the composite lens 10 in the first embodiment.
  • four first and second positioning portions 32a and 35a are provided.
  • the four first positioning portions 32a, 32a,... are provided on the circumference of the first circle around one point on the optical axis, and are arranged at equal intervals on the circumference of the first circle. ing.
  • the same four second positioning parts 35a, 35a, ... are provided outside the first uneven surface part 35b.
  • the second lens member can be joined to the first lens member, and the optical axes can be joined to each other.
  • first and second positioning portions are not limited to the above description in the present embodiment.
  • first and second positioning portions are either provided in the shape of a ring and V, while the remaining one is provided in a scattered manner on the circumference! / ,.
  • first and second positioning portions are provided on the circumference of the lens, if they are arranged asymmetrically with respect to the optical axis of the composite lens, the xy direction in the lens surface Since the second lens member can be bonded to the first lens member by matching the two, it is preferable.
  • FIG. 14 is a schematic sectional view of the compound lens 40 according to the fourth embodiment.
  • the relative positional relationship between the first positioning portion 42a and the second positioning portion 45a is different from that of the composite lens 10 in the first embodiment.
  • the compound lens 40 that works according to the present embodiment there are two first and second positioning portions 42a and 45a, respectively.
  • the two first positioning portions 42a and 42a are present on the circumference of the first circle centered on one point on the optical axis of the first lens portion 41.
  • the two second positioning portions 45a and 45a exist on the circumference of the second circle centered on one point on the optical axis of the second lens portion 44, and the diameter of the second circle is the diameter of the first circle. Bigger than.
  • the first positioning part 42a exists on a straight line passing through the viewpoint and one of the second positioning parts 45a, and the other first positioning part 42a And the second positioning portion 45a on the other side.
  • the second lens member can be joined to the first lens member with the optical axes thereof aligned with each other.
  • first and second positioning portions are provided.
  • the first and second positioning portions are either provided in the shape of a angulation V, while the other one is provided in a dotted manner on the circumference! /.
  • FIG. 15 is a schematic sectional view of the compound lens 50 according to the fifth embodiment.
  • an uneven surface portion (hereinafter referred to as “second uneven surface portion”) 52 b is also formed on the lens surface 52 of the first lens portion 51.
  • the second uneven surface portion 52b is present at a position that does not overlap the first uneven surface portion 55b when the compound lens 50 is viewed from the lens surface 55 of the second lens portion. Therefore, when the inside of the compound lens 50 is viewed from the lens surface 55 of the second lens portion 54, the first and second positioning portions 52a and 55a exist at the center of the optical axis.
  • the second uneven surface portion 52b and the first uneven surface portion 55b are arranged in order, and the first uneven surface portion 55b and the second uneven surface portion 52b are concentrically centered on one point on the optical axis of the compound lens 50. ing. Therefore, for example, light having a wavelength is incident around the optical axis to be condensed, and light having a wavelength ( ⁇ ⁇ ) is incident on the second uneven surface portion 52b to be condensed.
  • the light with the wavelength ( ⁇ ⁇ , ⁇ ) can be incident on the first uneven surface portion 55b and collected.
  • FIG. 16 is a schematic sectional view of the compound lens 60 according to the sixth embodiment.
  • the compound lens 60 that works in the present embodiment includes a third lens portion 61.
  • the third lens unit 61 is made of grease and is joined to the second lens unit 14 at the lens surface 15 of the second lens unit 14 and has a lens surface 62.
  • the lens surface 62 exists on the opposite side of the second cemented surface 63 where the third lens unit 61 is cemented to the second lens unit 14, and the third positioning unit 62a and the third uneven surface unit 62b. And have. Similar to the first and second positioning portions 12a and 15a, the third positioning portion 62a indicates the position of the optical axis of the third lens portion 61 on the lens surface 62, and is on the optical axis of the third lens portion 61. Therefore, it is aligned with the first and second positioning portions 12a and 15a in the optical axis direction.
  • the third uneven surface portion 62b is a diffractive portion, like the first uneven surface portion 15b, and is formed on the periphery of the lens surface 62.
  • the first, second, and third positioning units 12a, 15a, 62a are arranged in the optical axis direction at the center of the optical axis.
  • the first uneven surface portion 15b and the third uneven surface portion 62b are formed in order from the center of the optical axis toward the periphery, and the first uneven surface portion 15b and the third uneven surface portion 62b are a point on the optical axis of the compound lens 60. It is arranged concentrically with the center.
  • FIG. 17 is a schematic cross-sectional view illustrating a configuration of a compound lens 70 according to the seventh embodiment.
  • the compound lens 70 according to the present embodiment is a lens in which the fourth positioning portion 73a is formed on the compound lens 50 according to the fifth embodiment.
  • the fourth positioning portion 73a is formed on the lens surface 73 of the first lens portion 71, and exists on the optical axis of the first lens portion 71 in the same manner as the first positioning portion 72a. Therefore, the first positioning portion 72a, the second positioning portion 45a, and the fourth positioning portion 73a are aligned in the optical axis direction of the compound lens 70.
  • the tilt of the composite lens 70 can be controlled when the composite lens 70 is attached to the optical system.
  • FIG. 18 is a schematic sectional view of the compound lens 80 according to the eighth embodiment.
  • the compound lens 80 according to the present embodiment is a lens in which the fourth lens portion 81 is formed on the compound lens 70 of the seventh embodiment.
  • the fourth lens portion 81 is made of grease and is joined to the first lens portion 71 at the lens surface 73 of the first lens portion 71, and the lens surface on the opposite side to the third joint surface 83.
  • the lens surface 82 is formed with a fifth positioning portion 82a and a fourth uneven surface portion 82b, and the fourth uneven surface portion 82b is a diffractive portion in the same manner as the first uneven surface portion 45b.
  • the fifth positioning portion 82a like the first positioning portion 72a and the second positioning portion 45a, indicates the position of the optical axis of the fourth lens portion 81 on the lens surface 82. Since it exists on the optical axis, it is aligned with the first positioning portion 72a and the second positioning portion 45a in the optical axis direction. Thus, the fourth lens unit 81 is joined to the lens surface 73 of the first lens unit 71 so that the optical axis thereof coincides with the optical axis of the first lens unit 71 and the optical axis of the second lens unit 44. Yes. Therefore, unlike the compound lens formed by shifting the optical axis and joining the three lens parts, the compound lens 80 that is effective in the present embodiment can prevent the deterioration of the optical characteristics. [Other Embodiments]
  • Embodiments 1 to 8 may have the following configuration.
  • the force that the lens surface of the first lens portion is aspherical may be a flat surface as described in the second and third modifications, or may be a spherical surface, a cylindrical surface, a ball striking surface, and a toric surface. It may be a surface.
  • an energy-cured resin is a thermoplastic resin.
  • the energy curable resin is, for example, a thermosetting resin, an ultraviolet curable resin, an electron beam curable resin, or the like, and is a resin that is cured by applying predetermined energy (heat, ultraviolet ray, electron beam, etc.). .
  • predetermined energy heat, ultraviolet ray, electron beam, etc.
  • the second lens portion is molded using an ultraviolet curable resin, it may be cured by irradiating with ultraviolet rays.
  • the molten resin may be set on the uneven surface part of the lower mold and cooled by pressing the force first lens part.
  • the materials of the first, second, third and fourth lens portions are not limited to the above materials. Any of the materials may be glass or resin. In addition, the first, second, third and fourth lens parts may be mixed with impurities without affecting the optical characteristics!
  • the force on the surface of the lens that is formed on one lens surface is two or more types on one lens surface.
  • the first and second positioning portions have substantially the same shape, but may be different from each other.
  • the first positioning part may be formed in a semicircular cross section
  • the second positioning part may be formed in a triangular cross section.
  • the sizes of the first and second positioning portions may be different from each other.
  • one is formed in a convex shape and the other is formed in a concave shape!
  • the present invention can be mounted on an optical disc recording / reproducing apparatus.
  • it can be mounted on imaging devices (such as digital still cameras and digital video cameras) and display devices (such as projectors).

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
  • Optical Head (AREA)
  • Lens Barrels (AREA)

Abstract

L'invention concerne une lentille composite et un procédé de production d'une telle lentille, ou plus particulièrement, une lentille composite dans laquelle une seconde partie de lentille est liée à une première partie de lentille, ainsi qu'un procédé de production d'une telle lentille. La lentille composite (10) présente une première partie de lentille (11) possédant une surface de lentille (12) et présente également une seconde partie de lentille liée au niveau de la surface de lentille (12) à la première partie de lentille (11) présentant également une surface de lentille (15) sur le côté opposé de la surface de joint (16). Les première et seconde surfaces de lentille (12,15) présentent des première et seconde parties de positionnement (12a, 15a), respectivement. En outre, la première partie de positionnement (12a) est située au moins sur une ligne droite qui est sensiblement parallèle à l'axe optique et qui passe par la seconde partie de positionnement (15a). Dans une variante, la seconde partie de positionnement (15a) est située au moins sur une ligne droite qui est sensiblement parallèle à l'axe optique et qui passe par la première partie de positionnement (12a).
PCT/JP2007/059923 2006-05-16 2007-05-15 Lentille composite et procédé de production de cette dernière WO2007132833A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008515556A JPWO2007132833A1 (ja) 2006-05-16 2007-05-15 複合レンズおよびその製造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006136513 2006-05-16
JP2006-136513 2006-05-16

Publications (1)

Publication Number Publication Date
WO2007132833A1 true WO2007132833A1 (fr) 2007-11-22

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Application Number Title Priority Date Filing Date
PCT/JP2007/059923 WO2007132833A1 (fr) 2006-05-16 2007-05-15 Lentille composite et procédé de production de cette dernière

Country Status (2)

Country Link
JP (1) JPWO2007132833A1 (fr)
WO (1) WO2007132833A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002071909A (ja) * 2000-09-04 2002-03-12 Pioneer Electronic Corp レンズ及びその製造方法
JP2004240417A (ja) * 2003-01-14 2004-08-26 Nikon Corp 光学素子及びその製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002071909A (ja) * 2000-09-04 2002-03-12 Pioneer Electronic Corp レンズ及びその製造方法
JP2004240417A (ja) * 2003-01-14 2004-08-26 Nikon Corp 光学素子及びその製造方法

Also Published As

Publication number Publication date
JPWO2007132833A1 (ja) 2009-09-24

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