WO2022044322A1 - Système optique d'objectif, dispositif d'imagerie et endoscope - Google Patents

Système optique d'objectif, dispositif d'imagerie et endoscope Download PDF

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Publication number
WO2022044322A1
WO2022044322A1 PCT/JP2020/032884 JP2020032884W WO2022044322A1 WO 2022044322 A1 WO2022044322 A1 WO 2022044322A1 JP 2020032884 W JP2020032884 W JP 2020032884W WO 2022044322 A1 WO2022044322 A1 WO 2022044322A1
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WO
WIPO (PCT)
Prior art keywords
diaphragm
lens
distance
object side
optical axis
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Application number
PCT/JP2020/032884
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English (en)
Japanese (ja)
Inventor
貴博 井上
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オリンパス株式会社
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Priority to PCT/JP2020/032884 priority Critical patent/WO2022044322A1/fr
Publication of WO2022044322A1 publication Critical patent/WO2022044322A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B1/00—Instruments for performing medical examinations of the interior of cavities or tubes of the body by visual or photographical inspection, e.g. endoscopes; Illuminating arrangements therefor
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/04—Reversed telephoto objectives
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
    • G02B23/26—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes using light guides

Definitions

  • the present invention relates to an objective optical system, an image pickup device, and an endoscope.
  • a laminated optical system is known as a high-precision optical system that can be produced at low cost (see, for example, Patent Document 1).
  • the laminated optical system is manufactured by laminating and adhering a plurality of glass wafers with lenses produced by utilizing a semiconductor process, and then individualizing them into each laminated optical system.
  • the flare diaphragm when the flare diaphragm is provided in the laminated optical system, it is preferable to form a vapor deposition mask on the glass wafer in advance in consideration of the laminating process.
  • a flare diaphragm having a circular aperture used in a general optical system is deposited on a glass wafer, UV light is blocked by the flare diaphragm. Therefore, when laminating and adhering the glass wafers with lenses, there is a problem that the adhesive portion between the glass wafers with lenses cannot be irradiated with UV light and the adhesive cannot be cured efficiently.
  • the present invention has been made in view of the above-mentioned circumstances, and it suppresses the generation of flare and ensures that UV light is emitted to the bonded portion between the glass wafers with lenses when the glass wafers with lenses are laminated and bonded. It is an object of the present invention to provide an objective optical system, an image pickup device and an endoscope which can be irradiated and have high reliability.
  • a first aspect of the present invention includes a plurality of lens substrates in which at least one lens is formed on a plurality of substrates having the same external dimensions, a first diaphragm having an external dimension smaller than that of the lens substrate, and the lens substrate. And a second diaphragm having the same external dimensions, and a plurality of the lens substrates are arranged in a stacked state in the optical axis direction, and the first diaphragm and the second diaphragm are arranged in this order from the object side.
  • UV light can pass between the outer edge of the first diaphragm and the outer edge of the lens substrate because the outer dimension of the first diaphragm is smaller than the outer dimension of the lens substrate. Therefore, when the lens substrates are laminated and bonded, UV light is emitted from the object side to the image side between the outer edge of the first diaphragm and the outer edge of the lens substrate in a state where a plurality of lens substrates are arranged in a laminated state in the optical axis direction. It is possible to irradiate the adhesive portion between the lens substrates via the route. As a result, the adhesive applied to the adhesive portion can be efficiently cured.
  • the external dimensions of the second diaphragm with the external dimensions of the lens substrate, it is possible to block light between the outer edge of the second diaphragm and the outer edge of the lens substrate.
  • unnecessary light passing around the outer edge of the lens substrate from the object side to the image side on the image side of the first diaphragm is blocked by the second diaphragm, so that the occurrence of flare can be suppressed. Therefore, it is possible to suppress the generation of flare and surely irradiate the bonded portion between the lens substrates with UV light at the time of laminating and bonding the lens substrates, and it is possible to improve the reliability.
  • the objective optical system may include a brightness diaphragm arranged on the image side of the second diaphragm. Even if unnecessary light is blocked at a position close to the image plane by the second diaphragm, the scattered light by the second diaphragm may reach the image plane by causing multiple reflections. Therefore, by arranging the brightness diaphragm on the image side of the second diaphragm, the scattered light generated by the second diaphragm can be blocked by the brightness diaphragm.
  • the distance from the optical axis to the outer edge of the lens substrate is D0 / 2
  • the distance from the optical axis to the outer edge of the first aperture is D1o / 2
  • the distance from the optical axis to the brightness aperture is
  • the distance to the aperture edge is D3i / 2
  • the distance from the lens surface on the object side of the lens substrate on the most object side to the first aperture is L1
  • Conditional expression (1) is a conditional expression regarding the outer edge of the first aperture.
  • the distance D3i / 2 from the optical axis to the aperture edge of the brightness diaphragm and the distance L3 from the lens surface on the object side of the lens substrate on the object side to the brightness diaphragm are determined by the specifications of the objective optical system and aberration correction.
  • the distance from the optical axis to the outer edge of the lens substrate is D0 / 2
  • the distance from the optical axis to the outer edge of the first diaphragm is D1o / 2
  • the lens substrate on the most object side is the lens substrate.
  • Conditional expression (2) is a conditional expression regarding the outer edge of the first aperture.
  • the distance from the optical axis to the outer edge of the lens substrate is D0 / 2
  • the distance from the optical axis to the outer edge of the first diaphragm is D1o / 2
  • the opening from the optical axis to the second diaphragm is D2i / 2
  • the distance from the lens surface on the object side of the lens substrate on the most object side to the first aperture is L1
  • the distance from the lens surface on the object side of the lens substrate on the most object side is the second.
  • ⁇ D2i / 2 (L2 / L1) * ⁇ D1o / 2 (3)
  • ⁇ D1o / 2 (D0 / 2-D1o / 2)
  • ⁇ D2i / 2 (D0 / 2-D2i / 2).
  • Conditional expression (3) is a conditional expression regarding the opening edge of the second diaphragm.
  • the distance from the optical axis to the outer edge of the lens substrate is D0 / 2
  • the distance from the optical axis to the opening edge of the second diaphragm is D2i / 2
  • the distance from the optical axis to the brightness diaphragm is The distance to the outer edge is D3o / 2
  • the distance from the lens surface on the object side of the lens substrate on the most object side to the second aperture is L2
  • Conditional expression (4) is a conditional expression related to the outer edge of the brightness diaphragm.
  • a second aspect of the present invention is an image pickup apparatus including any of the above objective optical systems and an image pickup element that captures an optical image of an object imaged by the objective optical system. According to this aspect, the image quality can be improved by suppressing the generation of flare in the objective optical system.
  • a third aspect of the present invention is an endoscope provided with the above-mentioned imaging device.
  • the present invention it is possible to suppress the generation of flare and reliably irradiate the bonded portion between the glass wafers with lenses with UV light at the time of laminating and adhering the glass wafers with lenses, thereby improving reliability. It has the effect of being able to.
  • the image pickup apparatus 1 is arranged at the rigid tip portion 63a of the insertion portion 63 of the endoscope 61, for example, as shown in FIG.
  • the endoscope 61 has a flexible and elongated insertion portion 63, an operation portion 65 arranged on the base end side of the insertion portion 63, and a universal cord 67 for connecting the operation portion 65 and the processor 69. I have.
  • the insertion portion 63 includes a rigid tip portion 63a incorporating the image pickup apparatus 1, a bendable bending portion 63b arranged on the proximal end side of the rigid tip portion 63a, and a long length arranged on the proximal end side of the curved portion 63b. It is provided with a flexible portion 63c.
  • the operation unit 65 is provided with an angle knob 65a that bends the curved portion 63b in the vertical direction and the horizontal direction.
  • the processor 69 transmits a control signal, various detection signals, an acquired image signal, and the like via a signal cable inserted through the endoscope 61. Then, by transmitting the processed image signal to the monitor 71, the endoscope image and various information are displayed on the monitor 71.
  • the image pickup apparatus 1 includes an objective optical system 3 in which a plurality of optical elements (lens substrates) 11, 21, 31, and 41 are laminated, and an object imaged by the objective optical system 3. It is provided with an image pickup element 5 such as a CCD or CMOS that captures an optical image.
  • an image pickup element 5 such as a CCD or CMOS that captures an optical image.
  • the objective optical system 3 is formed by forming aspherical lenses 15, 25, 35, 45 made of a UV curable resin on a plurality of optically transparent glass substrates (substrates) 13, 23, 33, 43, respectively.
  • the optical elements 11, 21, 31, 41, a first flare diaphragm (first diaphragm) 51, a second flare diaphragm (second diaphragm) 53, and a brightness diaphragm 55 are provided.
  • the objective optical system 3 is a laminated optical system in which the first optical element 11, the second optical element 21, the third optical element 31, and the fourth optical element 41 are arranged in a laminated state in the optical axis direction in order from the object side. ..
  • the objective optical system 3 is made of a transparent medium except for the first flare diaphragm 51, the second flare diaphragm 53, and the brightness diaphragm 55. Further, the side surface of the objective optical system 3 is shielded from light by black coating or a black adhesive or the like. By blocking the light on the side surface of the objective optical system 3, external light is prevented from entering the optical path from the side surface of the objective optical system 3.
  • the lens 15 is formed on the image-side surface 13b of the glass substrate 13.
  • the lens 25 is formed on the surface 23a of the glass substrate 23 on the object side.
  • the lens 35 is formed on the surface 33a of the glass substrate 33 on the object side.
  • the lens 45 is formed on the surface 43a of the glass substrate 43 on the object side.
  • the glass substrates 13, 23, 33, and 43 are all quadrangular parallel flat plates having the same external dimensions in the cross section orthogonal to the optical axis. Since the cross-sectional sizes of the glass substrates 13, 23, 33, and 43 are the same, the shape of the objective optical system 3 can be approximated to a rectangular parallelepiped.
  • the first optical element 11 and the second optical element 21 are laminated with the spacer 27 sandwiched in the optical axis direction.
  • the second optical element 21 and the third optical element 31 are laminated with the spacer 37 sandwiched in the optical axis direction.
  • the third optical element 31 and the fourth optical element 41 are laminated with the spacer 47 sandwiched in the optical axis direction.
  • Each of the spacers 27, 37, 47 has a square frame shape having a certain thickness dimension, and has substantially the same external dimension as the external dimension of the glass substrate 23.
  • Each of the spacers 27, 37, 47 has a circular cross section of the openings 27a, 37a, 47a surrounding the optical path.
  • Each of these spacers 27, 37, 47 is formed of an optically transparent UV curable resin or a perforated glass wafer.
  • the spacer 27 is integrally molded with the lens 25 on the object-side surface 23a of the glass substrate 23.
  • the spacer 27 is adhered to the image-side surface 13b of the glass substrate 13 with the UV adhesive B.
  • the spacer 37 is integrally molded with the lens 35 on the object-side surface 33a of the glass substrate 33.
  • the spacer 37 is adhered to the image-side surface 23b of the glass substrate 23 with the UV adhesive B.
  • the spacer 47 is integrally molded with the lens 45 on the object-side surface 43a of the glass substrate 43.
  • the spacer 47 is adhered to the image-side surface 33b of the glass substrate 33 by the UV adhesive B.
  • the first flare diaphragm 51 is formed on the image-side surface 13b of the glass substrate 13 by a thin-film deposition method.
  • the first flare diaphragm 51 is formed in a ring band shape, for example, as shown in FIG. 3, and has a circular opening 51a in the center.
  • the first flare diaphragm 51 has an external dimension smaller than that of the first optical element 11. In other words, the distance from the outer edge of the first flare diaphragm 51 in the direction perpendicular to the optical axis to the optical axis is smaller than the distance from the outer edge of the first optical element 11 to the optical axis in the same direction.
  • the distance from the optical axis to the outer edge of the glass substrate 23 is D0 / 2
  • the distance from the optical axis to the outer edge of the first flare diaphragm 51 is D1o / 2
  • the distance from the optical axis is bright.
  • the distance to the aperture edge of the diaphragm 55 is D3i / 2
  • the distance from the lens surface of the first optical element 11 on the object side to the first flare diaphragm 51 is L1
  • the distance from the lens surface of the first optical element 11 on the object side is bright.
  • reference numeral 11a is attached to the lens surface of the first optical element 11 on the object side.
  • ⁇ D1o / 2 (L1 / L3) * ⁇ D3i / 2 (1)
  • ⁇ D1o / 2 (D0 / 2-D1o / 2)
  • ⁇ D3i / 2 (D0 / 2-D3i / 2).
  • the second flare diaphragm 53 is formed on the image-side surface 23b of the glass substrate 23 by a thin-film deposition method. As shown in FIG. 3, for example, the second flare diaphragm 53 is formed in a quadrangle having the same shape as the glass substrate 23, and has a circular opening 53a in the center. The opening 53a of the second flare diaphragm 53 has an inner diameter larger than the inner diameter of the opening 51a of the first flare diaphragm 51.
  • the distance from the edge of the opening of the second flare diaphragm 53 in the direction perpendicular to the optical axis to the optical axis is larger than the distance from the edge of the opening of the first flare diaphragm 51 in the same direction to the optical axis.
  • the second flare diaphragm 53 has the same external dimensions as the second optical element 21. In other words, the distance from the outer edge of the second flare diaphragm 53 in the direction perpendicular to the optical axis to the optical axis is the same as the distance from the outer edge of the second optical element 21 to the optical axis in the same direction.
  • the brightness diaphragm 55 is formed on the image-side surface 33b of the glass substrate 33 by a thin-film deposition method.
  • the brightness diaphragm 55 is formed in a ring band shape and has a circular opening 55a in the center. Further, the brightness diaphragm 55 has an external dimension smaller than that of the third optical element 31. In other words, the distance from the outer edge of the brightness diaphragm 55 in the direction perpendicular to the optical axis to the optical axis is smaller than the distance from the outer edge of the third optical element 31 to the optical axis in the same direction.
  • the image pickup element 5 has a light receiving surface 5a arranged at a position facing the image side surface 43b of the glass substrate 43.
  • the image pickup element 5 captures an optical image of the object by receiving light from the object focused by the objective optical system 3 by the light receiving surface 5a.
  • the image pickup element 5 is formed in a rectangular shape having a cross section orthogonal to the optical axis having the same external dimensions as the external dimensions of the optical elements 11, 21, 31, and 41 of the objective optical system 3.
  • the image pickup device 5 is arranged in a laminated state with the objective optical system 3 with a spacer or the like (not shown) interposed therebetween.
  • the objective optical system 3 is, for example, as shown in FIGS. 2, 5 to 7, a lens array in which a plurality of lenses 15, 25, 35, 45 are arranged in a matrix on glass wafers 113, 123, 133, 143, respectively. It is manufactured by individualizing 111, 121, 131, and 141 into each objective optical system 3 in a laminated state.
  • the glass wafers 113, 123, 133, 143 are, for example, colorless and transparent, and have light transmission.
  • a fourth lens array 141 in which a lens 45 and a spacer 47 are molded for each region of each fourth optical element 41 on a glass wafer 143, and each third optical on the glass wafer 133.
  • a third lens array 131 in which a lens 35 and a brightness diaphragm 55 are molded is prepared for each region of the element 31.
  • the optical axis of each lens 45 of the lens array 141 and the optical axis of each lens 35 of the lens array 131 are aligned with each other on each spacer 47.
  • the lens array 131 is arranged in a laminated state. Then, UV light is irradiated from the object side of the lens array 131 toward the UV adhesive B of the spacer 47.
  • each brightness diaphragm 55 is smaller than the external dimensions of each third optical element 31, UV light passes between the outer edge of each brightness diaphragm 55 and the outer edge of the region of each third optical element 31.
  • the UV light that has passed between the outer edge of the brightness diaphragm 55 and the outer edge of the region of each third optical element 31 from the object side to the image side is irradiated to the UV adhesive B on each spacer 47.
  • the lens array 141 and the lens array 131 are adhesively fixed.
  • a lens array 121 in which a flare diaphragm 53 is molded is prepared. Then, after applying the UV adhesive B to one end of each spacer 37, the optical axis of each lens 35 of the lens array 131 and the optical axis of each lens 25 of the lens array 121 are aligned with each other on each spacer 37. The lens array 121 is arranged in a laminated state. Then, UV light is irradiated from the object side of the lens array 121 toward the UV adhesive B of each spacer 37.
  • UV light that has passed through the opening 53a of each second flare diaphragm 53 from the object side to the image side is applied to the UV adhesive B on each spacer 37.
  • the lens array 131 and the lens array 121 are adhesively fixed.
  • the lens 15 is formed on the glass wafer 113 for each region of the first optical element 11.
  • the lens array 111 is prepared. Then, after applying the UV adhesive B to one end of each spacer 27, the optical axis of each lens 25 of the lens array 121 and the optical axis of each lens 15 of the lens array 111 are aligned with each other on each spacer 27.
  • the lens array 111 is arranged in a laminated state. Then, UV light is irradiated from the object side of the lens array 111 toward the UV adhesive B of each spacer 27.
  • each first flare diaphragm 51 is smaller than the external dimensions of each first optical element 11, UV light passes between the outer edge of each first flare diaphragm 51 and the outer edge of the region of each first optical element 11. As a result, the UV light that has passed between the outer edge of the first flare diaphragm 51 and the outer edge of the region of the first optical element 11 from the object side to the image side is applied to the UV adhesive B on each spacer 27. By curing the UV adhesive B, the lens array 121 and the lens array 111 are adhesively fixed.
  • the outer edge of the first flare diaphragm 51 satisfies the conditional expression (1), as shown in FIG. 4, the outer edge of the first flare diaphragm 51 passes outside the outer edge of the first flare diaphragm 51 from the object side, and the brightness is increased.
  • the out-of-field light that reaches the image plane side through the opening 55a of the diaphragm 55 can be blocked by the first flare diaphragm 51.
  • the laminated lens arrays 111, 121, 131, 141 are cut into individual pieces into each objective optical system 3 shown in FIG. As a result, a large number of objective optical systems 3 are collectively manufactured.
  • the image pickup apparatus 1, and the endoscope 61 As described above, according to the objective optical system 3, the image pickup apparatus 1, and the endoscope 61 according to the present embodiment, flare generation is suppressed, and when the optical elements 11,21,31,41 are laminated and bonded. In, UV light can be reliably irradiated to each adhesive portion between the optical elements 11, 21, 31, and 41. As a result, it is possible to improve the image quality and the reliability.
  • the distance D3i / 2 from the optical axis to the aperture edge of the brightness diaphragm 55 and the distance L3 from the lens surface 11a on the object side of the first optical element 11 to the brightness diaphragm 55 are the specifications of the objective optical system 3 and aberration correction. Therefore, by determining the arrangement position of the first flare diaphragm 51, it is possible to determine the required external dimensions of the first flare diaphragm 51.
  • the distance from the optical axis to the aperture edge of the second flare diaphragm 53 is D2i / 2
  • the lens surface 11a on the object side of the first optical element 11 is the second.
  • the opening 53a of the second flare diaphragm 53 is as follows, instead of the conditional equations (1) and (2), or together with one of the conditional equations (1) and (2). It may be possible to satisfy the conditional expression (3) of.
  • ⁇ D2i / 2 (L2 / L1) * ⁇ D1o / 2 (3)
  • ⁇ D1o / 2 (D0 / 2-D1o / 2)
  • ⁇ D2i / 2 (D0 / 2-D2i / 2).
  • the conditional expressions (1), (2), and (3) are used.
  • the external dimensions of the brightness diaphragm 55 may satisfy the following conditional expression (4).
  • FIG. 2 is illustrated, and the opening 53a of the second flare diaphragm 53 is set to be larger than the inner diameter of the opening 51a of the first flare diaphragm 51.
  • the lens configuration of the objective optical system 3 shown in FIG. 2 is an example.
  • the arrangement of the lenses constituting the objective optical system 3 can be appropriately changed, for example, the lens configuration shown in FIG.
  • the opening 53a of the second flare diaphragm 53 has an inner diameter dimension smaller than the inner diameter dimension of the first flare diaphragm 51. May be good.
  • the brightness diaphragm 55 has an external dimension smaller than that of the third optical element 31.
  • the brightness diaphragm 55 has a rectangular outer shape in the direction orthogonal to the optical axis, and has the same outer dimensions as the third optical element 31. May have.
  • the second flare diaphragm 53 may be provided on both sides of the glass substrate 23, respectively.
  • the present invention is not limited to the one to which the present invention is applied to the above-described embodiment and the modified examples, and may be applied to an embodiment in which these embodiments and the modified examples are appropriately combined, and the present invention is not particularly limited.
  • Image sensor 3 Objective optical system 5 Image sensor 11 First optical element (lens substrate) 13, 23, 33, 43 Glass substrate (substrate) 15, 25, 35, 45 Lens 21 Second optical element (lens substrate) 31 Third optical element (lens substrate) 41 Fourth optical element (lens substrate) 51 1st flare aperture (1st aperture) 53 Second flare aperture (second aperture) 55 Brightness aperture 61 Endoscope

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Abstract

L'invention concerne un système optique d'objectif (3) comprenant : une pluralité d'éléments optiques (11), (21), (31), (41) obtenus en formant respectivement des lentilles (15), (25), (35), (45) sur une pluralité de substrats en verre (13), (23), (33), (43) ayant la même dimension ; un premier diaphragme de torche (51) ayant une dimension externe plus petite que les éléments optiques (11), (21), (31), (41) ; et un second diaphragme de torche (53) ayant la même dimension externe que les éléments optiques (11), (21), (31), (41), la pluralité d'éléments optiques (11), (21), (31), (41) étant liés l'un à l'autre par des éléments d'espacement (27), (37), (47) entre ceux-ci tout en étant disposés dans un état d'empilement, et le premier diaphragme de torche (51) et le second diaphragme de torche (53) sont disposés sur les différents éléments optiques mutuellement différents (11), (21), (31), (41) dans l'ordre du premier diaphragme de torche (51) et du second diaphragme de torche (53) depuis le côté objet.
PCT/JP2020/032884 2020-08-31 2020-08-31 Système optique d'objectif, dispositif d'imagerie et endoscope WO2022044322A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011135979A1 (fr) * 2010-04-28 2011-11-03 コニカミノルタオプト株式会社 Procédé de production d'une lentille d'imagerie
WO2011136139A1 (fr) * 2010-04-30 2011-11-03 コニカミノルタオプト株式会社 Procédé de production d'un élément lentille mince, procédé de production d'une lentille de capture d'image, procédé de production d'un module de capture d'image, et procédé de production d'un dispositif électronique équipé d'un module de capture d'image
WO2012169369A1 (fr) * 2011-06-06 2012-12-13 オリンパスメディカルシステムズ株式会社 Unité optique et endoscope
WO2017203594A1 (fr) * 2016-05-24 2017-11-30 オリンパス株式会社 Unité d'imagerie endoscopique et endoscope

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011135979A1 (fr) * 2010-04-28 2011-11-03 コニカミノルタオプト株式会社 Procédé de production d'une lentille d'imagerie
WO2011136139A1 (fr) * 2010-04-30 2011-11-03 コニカミノルタオプト株式会社 Procédé de production d'un élément lentille mince, procédé de production d'une lentille de capture d'image, procédé de production d'un module de capture d'image, et procédé de production d'un dispositif électronique équipé d'un module de capture d'image
WO2012169369A1 (fr) * 2011-06-06 2012-12-13 オリンパスメディカルシステムズ株式会社 Unité optique et endoscope
WO2017203594A1 (fr) * 2016-05-24 2017-11-30 オリンパス株式会社 Unité d'imagerie endoscopique et endoscope

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