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WO2015152161A1 - Lentille de collimation - Google Patents

Lentille de collimation Download PDF

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Publication number
WO2015152161A1
WO2015152161A1 PCT/JP2015/059949 JP2015059949W WO2015152161A1 WO 2015152161 A1 WO2015152161 A1 WO 2015152161A1 JP 2015059949 W JP2015059949 W JP 2015059949W WO 2015152161 A1 WO2015152161 A1 WO 2015152161A1
Authority
WO
WIPO (PCT)
Prior art keywords
light source
collimator lens
lens
less
light
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2015/059949
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English (en)
Japanese (ja)
Inventor
保貴 寺嶋
照夫 山下
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoya Corp
Original Assignee
Hoya Corp
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 Hoya Corp filed Critical Hoya Corp
Priority to CN201580014677.3A priority Critical patent/CN106104351A/zh
Priority to JP2016511887A priority patent/JP6647195B2/ja
Publication of WO2015152161A1 publication Critical patent/WO2015152161A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • G02B27/30—Collimators

Definitions

  • the present invention relates to a collimator lens, and more particularly to a collimator lens used to convert light from a light source into parallel light.
  • a collimator lens that is a lens that converts a divergent light beam from a light source such as a laser light source into parallel light is known.
  • collimator lens for example, a lens incorporated in an optical system of a projection type image display apparatus using a laser light source is known (Patent Documents 1 and 2).
  • the chromatic aberration characteristics are improved in order to suppress the change of the working distance (working distance) accompanying the temperature rise.
  • This lens is intended for light with a wavelength of 375 nm or more and 750 nm or less from the laser light source, and has a numerical aperture of 0.2 or more and 0.75 or less.
  • the lens thickness is D, and the focal length of the lens When D is f, D / f> 0.85 is satisfied, and (2) when Abbe number is ⁇ d, ⁇ d> 57 is satisfied.
  • the light source side surface (first surface) and the emission side surface (second surface) of the lens are convex, and at least these A diffractive structure is provided on one surface.
  • the collimator lens when used in a projection-type image display device, has a main function of converting a divergent light beam emitted from a light source such as a laser light source into a parallel light beam.
  • a light source such as a laser light source
  • image display devices have been required to improve brightness.
  • lens transmittance as well as an increase in NA for a collimator lens used in an optical system of an image display device.
  • the present invention has been made for such a problem, and an object of the present invention is to provide a collimator lens having a high NA and an improved lens transmittance.
  • a collimator lens made of a glass material that converts a light beam having a wavelength of 380 nm to 700 nm emitted from a light source into a parallel light beam, On the opposite side of the surface facing the light source, has a surface provided with a convex portion, The numerical aperture NA is 0.6 or more, The ratio t / f of the center lens thickness t to the focal length f is 1.3 or less, The maximum surface angle of the surface provided with the convex portion is 65 ° or less, The glass material has a refractive index nd of 1.59 or more, The glass material has a total content of TiO 2 , WO 3 , Nb 2 O 5 , Bi 2 O 3 of 0 to 40 wt%, A collimator lens is provided.
  • FIG. 1 is a schematic side view showing the shape of a collimator lens 1 according to a preferred embodiment of the present invention.
  • the collimator lens 1 according to this embodiment is a glass lens used for converting a light beam having a wavelength of 380 nm to 700 nm emitted from a light source such as a laser device into parallel light. Specifically, for example, it is used in an optical system of a projection type image display apparatus such as a liquid crystal projector.
  • the collimator lens 1 is a single lens and has a so-called biconvex lens shape in which an annular edge portion is provided on the outer edge. Specifically, both surfaces of the surface (light source side surface) 2 facing the light source S and the surface (exit side surface) 4 opposite to the light source side surface 2 in use are provided with convex shapes. In this embodiment, both the light source side surface 2 and the emission side surface 4 are spherical. Further, the collimator lens 1 is provided with a flange-shaped edge portion 6 at the outer edge portion. The edge portion 6 is useful for fixing to the lens fixing member in the apparatus when incorporated in a projection type image display apparatus or the like, but may not be provided.
  • the collimator lens 1 preferably has a maximum surface angle of the emission side surface 2 of 65 ° or less.
  • the maximum surface angle is more preferably 55 ° or less, and further preferably 50 ° or less.
  • the surface angle ⁇ means an angle formed by a normal line at one position within the effective diameter on the lens surface and the lens central axis Z.
  • the lens formability such as press moldability and grinding or polishing processability is improved, and the lens shape can be easily evaluated.
  • the collimator lens 1 preferably has t / f (t: center lens thickness, f: focal length) of 1.3 or less. If 1.3 is exceeded, a practically sufficient working distance (working distance) (WD), for example, a WD of 1 mm or more cannot be secured.
  • the t / f is more preferably 1.20 or less.
  • t / f is preferably 0.3 to 1.3, more preferably 0.3 to 0.85, and even more preferably 0.3 to 0.80. It is.
  • the upper and lower limits of t / f will be described in detail.
  • the upper limit of t / f is preferable in order of 1.20 or less, 1.00 or less, 0.80 or less, and 0.70 or less from the viewpoint of securing WD.
  • the lower limit of t / f is preferable in the order of 0.30 or more, 0.40 or more, and 0.50 or more from the viewpoint of lens processability.
  • working distance (WD) means, for example, as shown in FIG. 1, the light source S, specifically, a point-like light emitting portion in the light source. And the distance between the parts closest to the light source on the light source side surface 2 of the collimator lens 1.
  • the numerical aperture NA of the collimator lens 1 is 0.6 or more.
  • the upper limit of NA is preferably 0.9 or less, for example, in order to ensure WD and make the maximum surface angle 65 ° or less.
  • the upper limit of NA can be 0.85 or less, 0.80 or less, or 0.75 or less.
  • the lower limit of NA can be greater than 0.6 (0.6 ⁇ ), 0.65 or more, 0.70 or more, or 0.71 or more.
  • the collimator lens 1 As a method for manufacturing the collimator lens 1, there are a precision press molding, a grinding process, a polishing process, and the like using a glass material.
  • a material for forming the collimator lens 1 for example, glass materials (glass I and glass II) having the following two types of composition systems can be used.
  • Glass I is a glass material containing B 2 O 3 and at least one selected from rare earth oxides such as La 2 O 3 , Gd 2 O 3 , and Y 2 O 3 .
  • Glass II is a glass material containing P 2 O 5 and at least one selected from Nb 2 O 5 , WO 3 , TiO 2 , and Bi 2 O 3 .
  • the glass material forming the collimator lens 1 preferably has a total content of TiO 2 , WO 3 , Nb 2 O 5 and Bi 2 O 3 in glass I or glass II of 0 to 40 wt%.
  • the total content of TiO 2 , WO 3 , Nb 2 O 5 , and Bi 2 O 3 is more preferably 0 to 28 wt%, and still more preferably 0 to 16 wt% from the viewpoint of improving pressability.
  • TiO 2 + WO 3 + Nb 2 O 5 + Bi 2 O 3 / ((total content of rare earth oxides) + Ta 2 O 5 ) ⁇ 1.1 is preferred. This ratio is more preferably 0.9 or less, and still more preferably 0.5 or less.
  • the glass material forming the collimator lens 1 has a refractive index nd of 1.59 or more.
  • the refractive index nd is more preferably 1.68 or more, further preferably 1.75 or more, and further preferably 1.80 or more. This is because the maximum surface angle of the exit side surface can be reduced by using such a refractive index nd.
  • the upper limit of the Abbe number of the glass material forming the collimator lens 1 is preferably 57 or less from the viewpoint of maintaining a high refractive index with a refractive index nd of 1.59 or more. Furthermore, the upper limit of the Abbe number is more preferably 50 or less or 45 or less from the viewpoint of increasing the refractive index.
  • the lower limit of the Abbe number is not particularly limited, but may be 20 or more.
  • the glass material forming the collimator lens 1 preferably has a glass transition temperature Tg ⁇ 630 ° C. from the viewpoint of suitability for precision press molding.
  • the glass material forming the collimator lens 1 contributes to a decrease in Tg, so that the ZnO content is preferably 3 wt% or more, more preferably 8 wt% or more, and even more preferably 10 wt% or more.
  • the total content of WO 3 , Nb 2 O 5 , and Bi 2 O 3 is suppressed to 40 wt% or less, so that the lens transmittance is improved and the laser light source emits light Light utilization efficiency can be increased.
  • the collimator lens 1 since the utilization efficiency of the emitted light from the laser light source is enhanced, the brightness of the projected image in the projection type image display apparatus is improved.
  • a laser light source laser diode (LD)), particularly a green laser, has a problem of increasing its output, but it is not easy to increase its output.
  • the transmittance of the collimator lens is improved, the brightness of the projected image is improved even when the laser output is low, and a sufficient projected image can be obtained. Furthermore, low power consumption can be achieved.
  • FIG. 2 is a block diagram schematically showing a configuration of a light source unit (illumination optical system) 10 of a projection type image display apparatus (for example, a liquid crystal projector) in which the collimator lens 1 of this embodiment is incorporated.
  • a light source unit illumination optical system
  • a projection type image display apparatus for example, a liquid crystal projector
  • the light source unit 10 includes three laser devices R, G, and B that respectively generate red light, green light, and blue light, and each laser (LD) device R, G , B are arranged on the downstream side of the collimator lens 1 respectively.
  • the collimator lens 1 converts divergent light emitted from each of the laser devices R, G, and B into parallel light.
  • the red light, the blue light, and the green light converted into parallel lights by the respective collimator lenses 1 are combined by a combining optical system 12 including a dichroic prism and transmitted to the projection optical system.
  • FIG. 3 is a block diagram schematically showing a configuration of a light source unit (illumination optical system) 14 of another projection type image display apparatus (for example, a liquid crystal projector) in which the collimator lens 1 of this embodiment is incorporated.
  • a light source unit illumination optical system
  • another projection type image display apparatus for example, a liquid crystal projector
  • the light source unit 14 includes a monochromatic light source (LD) 16 such as a near-ultraviolet laser device, and the collimator lens 1 is disposed on the downstream side of the monochromatic light source 16.
  • the collimator lens 1 converts the light emitted from the monochromatic light source 16 into parallel light.
  • the light source unit 14 includes a conversion unit 18 having three parts that convert near-ultraviolet light into red light, blue light, and green light.
  • this conversion unit 18 three parts that convert red light, blue light, and green light are sequentially arranged on the optical path of the near ultraviolet light, and the near ultraviolet light is red light, blue light, and It will be converted into green light. Then, these red light, blue light, and green light are sequentially sent to the projection optical system.
  • the collimator lens 1 of this embodiment is a collimator lens having a so-called biconvex shape, but the present invention is not limited to such a biconvex shape collimator lens.
  • the collimator lens of the present invention may have a surface provided with a convex portion on the opposite side to the surface facing the light source, and further have a predetermined condition.
  • it may have an outer shape as shown in FIGS. That is, as shown in FIG. 4, even a plano-convex lens 104 having no edge portion, a surface facing the light source S is a flat surface, and a surface 4 opposite to the surface 2 facing the light source S is a convex surface. Good. By flattening the surface facing the light source, it is advantageous in terms of securing working distance (WD) and lens processability. Further, the problem of decentering between the surface 2 facing the light source and the surface 4 on the opposite side does not occur.
  • WD working distance
  • a biconvex 105 lens that does not include the edge portion, the surface facing the light source S is a convex surface, and the surface 4 opposite to the surface 2 facing the light source S is also a convex surface. But you can.
  • a convex meniscus lens 106 that does not include an edge portion, the surface 2 facing the light source S is a concave surface, and the surface 4 opposite to the surface facing the light source S is a convex surface. But you can.
  • both the surface 2 facing the light source and the opposite surface 4 are spherical, but one or both of these surfaces may be aspherical.
  • the convex surface 4A opposite to the surface facing the light source spherical than the paraxial radius of curvature (R 0) of the (dashed), the paraxial curvature radius near the radius of curvature (R 1 )
  • the radius of curvature increases from the lens central axis Z toward the periphery (lens end 1a).
  • the paraxial radius of curvature refers to the radius of curvature on the central axis of the lens.
  • the convex surface of the surface opposite to the surface facing the light source may be an aspheric surface, and the convex surface or concave surface of the surface facing the light source may be an aspheric surface. This further improves the aberration characteristics.
  • Example 4 For example, a glass material of Example 4 described later is used, and an aspherical lens having the following specifications may be used.
  • Table 1 shows the constituents (compositions) of the glass material used to determine the maximum surface angle dependency of the lens transmittance on the exit side surface 4 in the lens shape of FIG.
  • FIG. 8 shows the relationship between the maximum surface angle of the exit side of the lens (exit side 4 in FIG. 1) and the transmittance of the lens (that is, the dependency of the transmittance on the maximum exit surface angle of the lens). ).
  • t / f is 1.3 or less.
  • FIG. 8 shows lens transmittances for NAs of 0.6, 0.65, and 0.71 at a wavelength of 430 nm (blue) for each glass material shown in Table 1 below.
  • the data of wavelength 530nm (green) and wavelength 650nm (red) are not described, generally the internal transmittance
  • lens characteristics were examined using the lens transmittance at a wavelength in this wavelength region (430 nm) as an index of lens transmittance.
  • the plot of the area surrounded by the dotted line is an embodiment of the present invention.
  • the lens transmittance on the vertical axis in FIG. 8 is normalized with the maximum value being 1. As shown in FIG. 8, the lens transmittance is good when the maximum surface angle is 55 ° or less, but deteriorates rapidly when it exceeds 65 °.
  • the data at wavelengths of 530 nm and 650 nm also showed the same tendency as the wavelength of 430 nm in FIG.
  • the lens transmittance is greatly different between the central portion and the peripheral portion. Therefore, in the parallel light converted by the collimator lens, the light passing through the central portion of the collimator lens and the center A luminance difference is produced between the light that has passed through the peripheral part of the part.
  • the upper limit of the maximum surface angle is preferably 65 ° or less, 60 ° or less, and 55 ° or less.
  • the lower limit of the maximum surface angle is preferably set to 20 ° or more from the viewpoint of setting NA to 0.6 or more.
  • Table 1 shows the index of the maximum surface angle and lens transmittance of each glass material.
  • the maximum surface angle is indicated by ⁇ when it is 65 ° or less from the result of FIG. 8, and by ⁇ when it exceeds 65 °.
  • Lens transmissivity is indicated by ⁇ ⁇ ⁇ as an index.
  • ⁇ is grade A (0.985 or more)
  • ⁇ is grade B (0.970 or more and less than 0.985)
  • x is grade C (less than 0.970).
  • the values in the parentheses are values obtained by normalizing the lens transmittance.
  • a glass material that satisfies both the maximum surface angle requirement and the lens transmittance index is shown as an example, and a glass material that does not satisfy the index is shown as a comparative example.
  • the maximum face angle is 65 ° or less
  • nd 1.59 or more
  • the total content of TiO 2 , WO 3 , Nb 2 O 5 , Bi 2 O 3 It can be seen that good lens transmittance characteristics can be obtained by suppressing the content to 40 wt% or less.
  • the glass material of Comparative Example 1 does not satisfy the requirement of the maximum surface angle.
  • Table 1 also shows that the glass material of Comparative Example 2 having a large total content of TiO 2 , WO 3 , Nb 2 O 5 , and Bi 2 O 3 in the glass has insufficient lens transmittance. These metal ions in the glass are considered to have a large ultraviolet absorption and deteriorate the lens transmittance.
  • the collimator lens 1 of the first embodiment is a collimator lens made of a glass material that converts a light beam having a wavelength of 380 nm to 700 nm emitted from a light source S into a parallel light beam.
  • the collimator lens 1 has a surface 4 provided with a convex portion on the opposite side to the surface 2 facing the light source S.
  • the numerical aperture NA is 0.6 or more
  • t / f is 1.3 or less (t: central lens thickness, f: focal length).
  • the maximum surface angle ⁇ 65 ° of the surface 4 provided with the convex portions is not more than 65 °.
  • the glass material forming the collimator lens 1 has a refractive index nd of 1.59 or more and a total content of TiO 2 , WO 3 , Nb 2 O 5 and Bi 2 O 3 is 0 to 40 wt%.
  • the convex portion provided on the surface 4 opposite to the surface facing the light source S can be an aspherical surface.
  • the surface facing the light source S may be a flat surface.
  • a convex portion is provided on the surface facing the light source S.
  • the convex portion provided on the surface facing the light source may be an aspherical surface.
  • the present invention may have a configuration in which a concave portion is provided on the surface facing the light source S, like the collimator lens 106 of the embodiment shown in FIG.
  • the light source S may be a light source used in an illumination optical system.
  • the illumination optical system may be an illumination optical system of a projection type image display apparatus.
  • the light source S may be a laser light source.
  • the present invention may be an illumination optical system using the collimator lenses summarized above. Furthermore, the present invention may be a projection type image display apparatus provided with such an illumination optical system.
  • Collimator lens 2 Light source side surface 4: Emission side surface S: Light source t: Center lens thickness f: Focal length

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Projection Apparatus (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Glass Compositions (AREA)

Abstract

　Le but de la présente invention est de fournir une lentille de collimation ayant une ouverture numérique élevée et une meilleure transmittance de lentille. La présente invention concerne une lentille de collimation (1) comprenant un matériau de verre destiné à convertir des rayons lumineux ayant une longueur d'onde de 380 à 700 nm émis par une source de lumière (S) en un faisceau parallèle, la face opposée à la surface tournée vers la source de lumière ayant une surface pourvue d'une partie en saillie ; l'ouverture numérique (NA) étant de 0,6 ou plus ; le rapport (t/f) de l'épaisseur centrale de la lentille à la distance focale (f) étant de 1,3 ou moins ; l'angle de surface maximum de la surface pourvue de la partie en saillie étant de 65° ou moins ; l'indice de réfraction (nd) étant de 1,59 ou plus ; et la teneur totale en TiO2, en WO3, en Nb2O5 et en Bi2O13 du matériau de verre étant de 0 à 40 % en poids.
PCT/JP2015/059949 2014-03-31 2015-03-30 Lentille de collimation Ceased WO2015152161A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201580014677.3A CN106104351A (zh) 2014-03-31 2015-03-30 准直透镜
JP2016511887A JP6647195B2 (ja) 2014-03-31 2015-03-30 コリメータレンズ

Applications Claiming Priority (2)

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JP2014-072424 2014-03-31
JP2014072424 2014-03-31

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WO2015152161A1 true WO2015152161A1 (fr) 2015-10-08

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JP (1) JP6647195B2 (fr)
CN (1) CN106104351A (fr)
TW (1) TWI687714B (fr)
WO (1) WO2015152161A1 (fr)

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JP2018189958A (ja) * 2017-05-01 2018-11-29 カンタムエレクトロニクス株式会社 光学系装置、両凸レンズ
WO2019198293A1 (fr) * 2018-04-11 2019-10-17 ソニー株式会社 Système de microscope et dispositif source de lumière médicale
JP2020057571A (ja) * 2018-10-04 2020-04-09 カンタム・ウシカタ株式会社 光学系装置、両凸レンズ

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CN109188398B (zh) * 2018-09-26 2023-08-04 深圳市速腾聚创科技有限公司 激光雷达、快慢轴光束能量的收敛系统及收敛方法
CN109725373B (zh) * 2019-03-07 2020-08-21 山东理工大学 一种用于光通讯领域的to非球面透镜

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WO2019198293A1 (fr) * 2018-04-11 2019-10-17 ソニー株式会社 Système de microscope et dispositif source de lumière médicale
JP2020057571A (ja) * 2018-10-04 2020-04-09 カンタム・ウシカタ株式会社 光学系装置、両凸レンズ

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TW201600880A (zh) 2016-01-01
JP6647195B2 (ja) 2020-02-14
TWI687714B (zh) 2020-03-11
CN106104351A (zh) 2016-11-09
JPWO2015152161A1 (ja) 2017-04-13

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