WO2020090416A1 - Lens unit - Google Patents

Lens unit Download PDF

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Publication number
WO2020090416A1
WO2020090416A1 PCT/JP2019/040157 JP2019040157W WO2020090416A1 WO 2020090416 A1 WO2020090416 A1 WO 2020090416A1 JP 2019040157 W JP2019040157 W JP 2019040157W WO 2020090416 A1 WO2020090416 A1 WO 2020090416A1
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WO
WIPO (PCT)
Prior art keywords
lens
lens unit
hydrophilic film
film
object side
Prior art date
Application number
PCT/JP2019/040157
Other languages
French (fr)
Japanese (ja)
Inventor
山本　明典
加本　貴則
小百合 中川
秀 塩原
ジェニファー トレス ダマスコティ
友啓 渡邉
Original Assignee
日本電産サンキョー株式会社
日本電産株式会社
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 日本電産サンキョー株式会社, 日本電産株式会社 filed Critical 日本電産サンキョー株式会社
Publication of WO2020090416A1 publication Critical patent/WO2020090416A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G02B1/113—Anti-reflection coatings using inorganic layer materials only
    • G02B1/115—Multilayers

Definitions

  • the present invention relates to a lens unit in which a holder holds a plurality of lenses.
  • the holder has a first lens-holding tubular portion that overlaps the outermost peripheral surface of the first lens from the outside in the radial direction.
  • the object-side end of the first lens-holding tubular portion is attached to the first lens holding portion.
  • the first lens is held by crimping the outer peripheral side end portion from the object side. For this reason, if the hydrophilic film is formed thickly on the outermost peripheral surface of the first lens, it may be difficult or difficult to insert the first lens into the first lens holding cylinder of the holder. There is a problem.
  • the size in which the caulking portion overlaps the outer peripheral side end portion of the first lens is small, so that caulking may be insufficient. There is a problem.
  • an object of the present invention is to provide a lens capable of properly fixing the first lens inside the holder even when a hydrophilic film is provided on the object-side first lens surface of the first lens. To provide a unit.
  • one aspect of a lens unit according to the present invention includes a plurality of lenses, and a cylindrical holder that holds the plurality of lenses inside, and the holder includes the plurality of lenses.
  • the first lens-holding tubular portion that overlaps the radially outermost outermost peripheral surface of the first lens closest to the object side from the radially outer side, and the object-side end portion of the first lens-holding tubular portion
  • the outer peripheral side of the first lens has a caulking portion covered from the object side at an outer peripheral side end facing the object side, and the first lens includes a first lens surface on the object side, and a first lens surface on the image side.
  • a hydrophilic film is coated on the two lens surfaces and the area excluding the outermost peripheral surface.
  • the hydrophilic film is provided on the first lens surface of the first lens, when water adheres to the first lens surface side, the water becomes a thin film and adheres to the first lens surface side. .. Therefore, it is possible to prevent the quality of the image captured by the lens unit from significantly deteriorating.
  • the hydrophilic film is not provided on the outermost peripheral surface of the first lens, the hydrophilic film is formed thicker than the outermost peripheral surface of the first lens on the outermost radial direction. Even if the first lens cannot be inserted into the first lens holding cylinder, or even if the first lens can be inserted into the first lens holding cylinder of the holder, the caulked portion is attached to the outer peripheral side end of the first lens. It is unlikely that the overlapping dimension will be small. Therefore, even when the hydrophilic film is provided on the object-side first lens surface of the first lens, the first lens can be properly fixed inside the holder.
  • the first lens includes a flange portion that connects the first lens surface and the second lens surface, and the outermost peripheral surface is a side surface portion located on the outermost radial direction of the flange portion. Aspects can be adopted.
  • the flange portion is a first side surface portion extending from the outer edge of the first lens surface toward the image side, an image side of the first side surface portion, and a radial outer side of the first side surface portion.
  • a second side surface portion extending from the object side toward the image side; and a connecting surface connecting the image side end portion of the first side surface portion and the object side end portion of the second side surface portion, A mode can be adopted in which the connecting surface is the outer peripheral side end portion and the second side surface portion is the outermost peripheral surface.
  • the hydrophilic film is provided on the entire area of the first lens surface and a part of the first side surface portion.
  • the hydrophilic film can be provided on the entire area of the first lens surface. Therefore, the quality of the image captured by the lens unit deteriorates due to the difference in reflectance and transmittance between the region of the first lens surface where the hydrophilic film is present and the region of the first lens surface where the hydrophilic film is not present. That situation is unlikely to occur.
  • the caulking portion may partially cover the first side surface portion, and the hydrophilic film may be provided in a portion of the first side surface portion exposed from the caulking portion.
  • the present invention it is possible to adopt a mode in which an antireflection film is provided on the first lens surface, and the hydrophilic film is provided on the object side surface of the antireflection film. According to this aspect, it is possible to suppress the generation of a ghost due to the reflection on the first lens surface.
  • the first lens surface is a convex spherical surface having a radius of curvature of 10 mm or more and 15 mm or less.
  • the plasma treatment is performed on the first lens surface, it is easy to perform the plasma treatment on the entire area of the first lens surface.
  • the first lens may be a glass lens.
  • the hydrophilic film can adopt a mode including particles of silicon oxide and particles of titanium oxide. According to this aspect, while the hydrophilicity is enhanced by the particles of silicon oxide, the photocatalytic action of the titanium oxide particles can decompose the stains made of the organic matter attached to the first lens surface side.
  • the first lens surface of the first lens is provided with the hydrophilic film, when water adheres to the first lens surface side, the water becomes a film and becomes the first lens surface side. Adhere to. Therefore, it is possible to prevent the quality of the image captured by the lens unit from significantly deteriorating.
  • the hydrophilic film is not provided on the outermost peripheral surface of the first lens, the hydrophilic film is formed thicker than the outermost peripheral surface of the first lens on the outermost radial direction. Even if the first lens cannot be inserted into the first lens holding cylinder, or even if the first lens can be inserted into the first lens holding cylinder of the holder, the caulked portion is attached to the outer peripheral side end of the first lens. It is unlikely that the overlapping dimension will be small. Therefore, even when the hydrophilic film is provided on the object-side first lens surface of the first lens, the first lens can be properly fixed inside the holder.
  • Sectional drawing which shows the one aspect
  • Sectional drawing which expands and shows the flange part etc. of the 1st lens shown in FIG.
  • Explanatory drawing which shows the effect of the hydrophilic film shown in FIG.
  • the graph which shows the relationship of the conditions of the plasma irradiation process shown in FIG. 4, and the contact angle of water on the 1st lens surface side.
  • FIG. 1 is a cross-sectional view showing one mode of a lens unit 1 to which the present invention is applied, and the lens unit 1 has a substantially similar configuration over the entire optical axis L.
  • the lens unit 1 shown in FIG. 1 includes a wide-angle lens 10 in which a plurality of lenses are arranged in the optical axis L direction, and a cylindrical holder 7 that holds the wide-angle lens 10 inside, and is used in an imaging device or the like. Used in optical devices.
  • the holder 7 is made of light-shielding resin.
  • the wide-angle lens 10 has, for example, a lens configuration of 6 elements in 5 groups. More specifically, the wide-angle lens 10 includes a first lens 11 having negative power, a second lens 12 having negative power, from the object side La (subject side / front side) toward the image side Lb. It has a third lens 13 having positive or negative power, a fourth lens 14 having positive power, and a cemented lens 17 (fifth lens 15 and sixth lens 16) having positive power.
  • the second lens 12 and the third lens 13 are plastic lenses.
  • the fourth lens 14 is a glass lens.
  • the cemented lens 17 is a cemented lens of a fifth lens 15 which is a plastic lens having a negative power and a sixth lens 16 which is a plastic lens having a positive power.
  • the lens unit 1 has an annular light shielding sheet 2 between the second lens 12 and the third lens 13, and an annular diaphragm 3 between the third lens 13 and the fourth lens 14. There is. Further, the lens unit 1 has an infrared cut filter 4 on the image side Lb side of the cemented lens 17.
  • the first lens 11 is a glass lens or a plastic lens, and in the present embodiment, the first lens 11 is a glass lens.
  • the first lens 11 is a meniscus lens. More specifically, in the first lens 11, the first lens surface 11a on the object side La is a convex curved surface protruding toward the object side La, and the second lens surface 11b on the image side Lb is the object side. It has a concave curved surface that is concave toward La, and the first lens surface 11a and the second lens surface 11b are connected by a flange portion 11c.
  • the first lens surface 11a is a convex spherical surface having a radius of curvature of 10 mm or more and 15 mm or less.
  • the entire first surface 111 on the object side La is the first lens surface 11a
  • the second surface 112 on the image side Lb is the second lens surface only in the central portion through which the optical axis L passes. It is 11b. Therefore, a portion of the second surface 112 located on the outer peripheral side of the second lens surface 11b is a surface on the image side Lb of the flange portion 11c orthogonal to the optical axis L.
  • the radially outermost outermost peripheral surface 115 of the first lens 11 in the radial direction is a second side surface portion 117, which will be described later, of the side surface portion 110 of the flange portion 11c.
  • the first lens 11 has a larger outer diameter than the second lens 12, the third lens 13, the fourth lens 14, and the cemented lens 17.
  • the second lens 12, the third lens 13, and the cemented lens 17 have substantially the same outer diameter, and in the cemented lens 17, the fifth lens 15 has a larger outer shape than the sixth lens 16.
  • the outer diameter of the fourth lens 14 is smaller than that of the second lens 12 and the like.
  • the holder 7 extends from the first lens holding tubular portion 70 toward the image side Lb, and the first lens holding tubular portion 70 that surrounds the first lens 11 on the most object side La.
  • the first lens holding tubular portion 70 overlaps the radially outermost outermost peripheral surface 115 of the first lens 11 from the radially outer side.
  • An annular recess 720 for stealing meat is formed in the second tubular portion 72.
  • the inner diameters of the first tubular portion 71 and the second tubular portion 72 are equal, and the inner diameter of the first lens holding tubular portion 70 is larger than that of the first tubular portion 71 and the second tubular portion 72. Therefore, an annular step portion 74 facing the object side La is formed between the inner circumferential surface of the first lens holding tubular portion 70 and the inner circumferential surface of the first tubular portion 71.
  • An annular groove 740 is formed in the step portion 74, and the annular seal member 5 is arranged inside the groove 740.
  • An annular step portion 721 is formed on the inner peripheral surface of the second tubular portion 72 so as to project radially inward at an intermediate position in the optical axis L direction and face the object side La.
  • the flange portion 155 of the fifth lens 15 is in contact with the step portion 721 from the object side La.
  • the fourth lens 14 is held by the lens barrel 6, and the lens barrel 6 is in contact with the flange portion 155 of the fifth lens 15 from the object side La.
  • the flange portion 135 of the third lens 13 is in contact with the lens barrel 6 from the object side La via the diaphragm 3.
  • the flange portion 125 of the second lens 12 is in contact with the flange portion 135 of the third lens 13 from the object side La via the light shielding sheet 2.
  • the flange portion 125 of the second lens 12 is covered with a caulking portion 75 formed by plastically deforming the end portion of the inner peripheral surface of the first cylindrical portion 71 on the object side La inward in the radial direction from the object side La. Is restricted from moving to the object side La.
  • the second lens 12, the light shielding sheet 2, the third lens 13, the diaphragm 3, the fourth lens 14, and the cemented lens 17 are held inside the first tubular portion 71 and the second tubular portion 72.
  • FIG. 2 is an enlarged cross-sectional view showing the flange portion 11c and the like of the first lens 11 shown in FIG. 1, and the first lens 11 has a substantially similar configuration over the entire optical axis L.
  • the holder 7 has a caulking portion 75 that fixes the first lens 11 inside the first lens holding tubular portion 70.
  • the caulking portion 75 heats an annular rib (not shown) formed at the end portion of the first lens holding tubular portion 70 on the object side La, and moves to the object side La on the outer peripheral side of the first lens 11. It is a portion that is plastically deformed inward in the radial direction so as to cover the facing outer peripheral end 119 from the object side La.
  • the second surface 112 which is the image-side Lb surface of the first lens 11, abuts on the step portion 74 and is positioned in the optical axis L direction.
  • the second surface 112 of the first lens 11 abuts the annular seal member 5 from the object side La, and the seal member 5 seals between the second surface 112 of the first lens 11 and the holder 7.
  • a light blocking layer (not shown) is formed on the second surface 112 of the first lens 11 on the outer peripheral side of the second lens surface 11b.
  • the flange portion 11c of the first lens 11 includes the first side surface portion 116 extending from the outer edge of the first lens surface 11a toward the image side Lb, and the first side surface.
  • a second side surface portion 117 extending from the object side La toward the image side Lb on the image side Lb side of the portion 116 and radially outward of the first side surface portion 116, and an image side end portion 116b of the first side surface portion 116.
  • a connection surface 118 that connects the object-side end 117a of the second side surface 117 to each other.
  • the connecting surface 118 is an outer peripheral side end 119 that the caulking portion 75 covers from the object side La, and the second side surface portion 117 is the outermost periphery of the first lens 11 where the first lens holding tubular portion 70 overlaps from the radially outer side. This is the surface 115.
  • the first side surface portion 116 and the second side surface portion 117 extend substantially parallel to the optical axis L, and the first lens holding cylinder portion 70 surrounds the second side surface portion 117.
  • the connecting surface 118 is an inclined surface that is inclined to form an angle of 30 ° to 70 ° with respect to the optical axis L.
  • the caulking portion 75 is formed so as to incline radially inward so as to cover the coupling surface 118 from the end on the object side La of the first lens holding tubular portion 70 over the entire circumference. It is covered from the object side La.
  • the radial inner end 750 of the crimped portion 75 is a virtual extension obtained by extending the surface (first surface 111) of the first lens 11 on the object side La to the radial outer side at any position in the circumferential direction. It is located on the image side Lb with respect to the surface S.
  • the radially inner end 750 of the caulking portion 75 partially covers the first side surface portion 116 over the entire circumference.
  • the radially inner end 750 of the caulking portion 75 has a protruding portion 751 that protrudes toward the object side La along the first side surface portion 116 and covers the first side surface portion 116 from the radially outer side.
  • the projecting portion 751 covers the position of the first side surface portion 116 away from the object side end portion 116a toward the image side Lb.
  • the projecting portion 751 partially overlaps the first side surface portion 116 over the entire circumference, and the portion 116c of the first side surface portion 116 located on the object side La with respect to the projecting portion 751 is separated from the caulking portion 75. Exposed.
  • the antireflection film 8 is laminated over the entire area of the first lens surface 11 a (first surface 111) of the first lens 11. Therefore, it is possible to suppress the occurrence of a ghost due to the reflection on the first lens surface 11a in the image captured by the lens unit 1.
  • the antireflection film 8 is composed of a dielectric multilayer film in which dielectric layers having different refractive indexes are alternately laminated.
  • the antireflection film 8 is, for example, a laminated film in which a silicon oxide film and a titanium oxide film are alternately deposited, and the most object side La is a silicon oxide film.
  • the silicon oxide film has a refractive index of 1.4611 for light with a wavelength of 530 nm
  • the titanium oxide film has a refractive index of 2.3466 for light with a wavelength of 530 nm.
  • the antireflection film 8 is a film formed in the state of the first lens 11 alone, and is not formed on the holder 7. Although the antireflection film 8 is formed over the entire area of the first lens surface 11a (first surface 111) of the first lens 11, the side surface portion 110 (first side surface portion 116, second side surface portion 117) of the flange portion 11c is formed. , And the connecting surface 118) and the second surface 112 are not formed.
  • FIG. 3 is an explanatory diagram showing the effect of the hydrophilic film 9 shown in FIG. 2, and is an image (a) of the first lens surface 11 a when the hydrophilic film 9 is not formed and a first image when the hydrophilic film 9 is formed. An image (b) of the lens surface 11a is shown.
  • the surface of the antireflection film 8 on the object side La is coated with a hydrophilic film 9.
  • the hydrophilic film 9 since the hydrophilic film 9 is laminated on the antireflection film 8, it constitutes a part of the dielectric multilayer film together with the antireflection film 8. Therefore, the refractive index and the film thickness are set so that the hydrophilic film 9 does not deteriorate the characteristics of the antireflection film 8.
  • the hydrophilic film 9 has a refractive index of 1.5 to 1.7 for light having a wavelength of 530 nm and a film thickness of 30 nm to 100 nm.
  • the hydrophilic film 9 is, for example, a coating layer containing silicon oxide particles and titanium oxide particles. Therefore, the hydrophilic silanol group of the silicon oxide particles enhances the hydrophilicity of the first lens surface 11a, while the photocatalytic action of the titanium oxide particles decomposes the organic contaminants adhering to the first lens surface 11a. You can
  • the hydrophilic film 9 contains silica particles, titanium oxide particles, and silica fine particles.
  • the average particle size of the silica fine particles is smaller than the average particle size of the silica particles.
  • the silica particles, the titanium oxide particles and the silica fine particles are dispersed and attached to the surface of the antireflection film 8.
  • the hydrophilic film 9 contains silica particles and titanium oxide particles, and thus exhibits high hydrophilicity.
  • the hydrophilicity of the hydrophilic film 9 can be recovered by irradiating the hydrophilic film 9 with light (ultraviolet light). Further, since the hydrophilic film 9 contains silica fine particles, the surface roughness of the hydrophilic film 9 can be reduced and the wear resistance of the first lens 11 can be improved.
  • the average particle size of silica particles is 1 nm or more and 200 nm or less
  • the average particle size of titanium oxide particles is 1 nm or more and 100 nm or less
  • the average particle size of silica fine particles is 0.5 nm or more and 10 nm or less.
  • the silica particles preferably include hollow silica particles or porous silica particles. Since the silica particles include the hollow silica particles or the porous silica particles, the contact angle of the water droplet with respect to the hydrophilic film 9 can be maintained at 10 ° or less for a long period of time. In this way, the hydrophilicity of the hydrophilic film 9 can be further improved by containing the hollow silica particles or the porous silica particles in the silica particles.
  • hollow silica particles have a space inside.
  • the hollow silica particles can be formed by dissolving the core particles after coating the core particles with silica by a sol-gel method.
  • hollow silica particles can be formed by coating core particles made of calcium carbonate with silica and then dissolving the core particles with an acid.
  • the porous silica particles have mesopores. The size of the mesopores is 0.1 nm or more and 119 nm or less.
  • porous silica particles are formed by a sol-gel reaction.
  • the hydrophilic film 9 contains silica particles, titanium oxide particles, and niobium compound particles.
  • the silica particles, the titanium oxide particles, and the niobium compound particles are dispersed and attached to the surface of the antireflection film 8.
  • the hydrophilic film 9 contains silica particles and titanium oxide particles, and thus exhibits high hydrophilicity. Further, even if the hydrophilicity of the hydrophilic film 9 is lowered by use, the hydrophilicity of the hydrophilic film 9 can be recovered by irradiating the hydrophilic film 9 with light (ultraviolet light).
  • the hydrophilic film 9 contains the niobium compound particles, the wear resistance of the first lens 11 can be improved.
  • the silica particles preferably include hollow silica particles or porous silica particles. Since the silica particles include the hollow silica particles or the porous silica particles, the contact angle of the water droplet with respect to the hydrophilic film 9 can be maintained at 10 ° or less for a long period of time.
  • the average particle size of silica particles is 1 nm or more and 200 nm or less, and the average particle size of titanium oxide particles is 1 nm or more and 100 nm or less.
  • the hydrophilic film 9 When the hydrophilic film 9 is not provided, as can be seen from the image (a) in FIG. 3, when water adheres to the first lens surface 11a side, fine water droplets adhere to the first lens surface 11a, and The quality of the image captured by the unit 1 is significantly deteriorated.
  • the hydrophilic film 9 since the hydrophilic film 9 is provided on the first lens surface 11a, when water adheres to the first lens surface 11a side, as can be seen from the image (b) of FIG. Since the water becomes a thin film, it is possible to prevent the quality of the image captured by the lens unit 1 from being significantly deteriorated.
  • the hydrophilic film 9 is a film formed in the state of the first lens 11 alone, and is not coated on the holder 7. Further, the hydrophilic film 9 is coated on the entire area of the first lens surface 11a and on the second surface 112 including the second lens surface 11b and the area excluding the outermost peripheral surface 115. That is, the hydrophilic film 9 is coated on the entire area of the first lens surface 11a, but is not coated on the second surface 112 including the second lens surface 11b and the outermost peripheral surface 115. Further, the hydrophilic film 9 is not formed on the connecting surface 118 either. However, the hydrophilic film 9 is provided on a part of the first side surface portion 116. More specifically, the hydrophilic film 9 is also provided on the portion 116c of the first side surface portion 116 exposed from the radially inner end 750 of the caulking portion 75.
  • the hydrophilic film 9 is formed in the state of the first lens 11 alone, for example, even if a defective product is generated in the process of forming the hydrophilic film 9, the lens unit 1 is discarded. You don't have to.
  • the hydrophilic film 9 is not provided on the outermost peripheral surface 115 of the first lens 11, the hydrophilic film 9 is formed thicker than the outermost peripheral surface 115 of the first lens 11, so that Even if the first lens 11 cannot be inserted into the first lens holding tubular portion 70, or even if the first lens 11 can be inserted into the first lens holding tubular portion 70 of the holder 7, the outer peripheral side of the first lens 11 It is unlikely that the size in which the crimped portion 75 overlaps the end portion 119 becomes small. Therefore, even when the hydrophilic film 9 is provided on the first lens surface 11a of the first lens 11, the first lens 11 can be properly fixed inside the holder 7.
  • the hydrophilic film 9 is provided from the first lens surface 11a to a part of the first side surface portion 116, the hydrophilic film 9 can be formed over the entire area of the first lens surface 11a. Therefore, the image captured by the lens unit 1 is caused by the difference in reflectance or transmittance between the region of the first lens surface 11a where the hydrophilic film 9 is present and the region of the first lens surface 11a where the hydrophilic film 9 is not present. It is unlikely that the quality of the product will deteriorate. Even in this case, since the hydrophilic film 9 is provided on the portion of the first side surface portion 116 exposed from the radially inner end 750 of the caulking portion 75, the presence of the hydrophilic film 9 may cause insufficient caulking or the like. It is possible to suppress the occurrence. Therefore, it is possible to prevent the fixing strength of the first lens 11 from decreasing and the intrusion of water from the inside of the caulking portion 75.
  • FIG. 4 is an explanatory view showing one aspect of the coating method according to the present invention.
  • FIG. 5 is a graph showing the relationship between the conditions of the plasma irradiation step ST1 shown in FIG. 4 and the contact angle of water on the first lens surface 11a side.
  • FIG. 6 is an explanatory diagram of the immersion depth of the first lens 11 in the immersion step ST3 shown in FIG.
  • the antireflection film 8 when coating the hydrophilic film 9 on the first lens 11, first, the antireflection film 8 is formed on the first lens surface 11a of the first lens 11, and then the hydrophilic film 9 is formed.
  • Each step shown in is performed.
  • the plasma irradiation step ST1 the surface of the antireflection film 8 is irradiated with plasma P, and the antireflection film 8 is hydrophilized.
  • the antireflection film 8 has high hydrophilicity immediately after film formation, but since the hydrophilicity decreases with time, the hydrophilicity of the surface of the antireflection film 8 is increased by irradiating the plasma P.
  • the plasma P is oxygen plasma or nitrogen plasma.
  • the irradiation of the plasma P increases the hydrophilicity of the entire surface of the antireflection film 8.
  • the plasma P is irradiated from the direction along the optical axis L, the plasma P is less likely to be irradiated on the first side surface portion 116, and the increase in hydrophilicity of the first side surface portion 116 can be suppressed.
  • the plasma P is generated in a band shape, the plasma P and the first lens 11 are relatively moved, and the first lens surface 11a is scanned with the plasma P as indicated by an arrow D. Therefore, a value obtained by multiplying the scanning speed of the plasma P and the number of scans is the irradiation amount of the plasma P, and the hydrophilicity of the surface of the antireflection film 8 changes depending on the irradiation amount of the plasma P as shown in FIG. To do.
  • a solid line P1 shows a contact angle between water and the surface of the antireflection film 8 when the scanning speed is set to 200 mm / s and the number of times of scanning is changed. Further, in FIG. 5, the contact angle between water and the surface of the antireflection film 8 when the scanning speed is set to 60 mm / s is shown by a solid line P2.
  • the contact angle decreases as the number of times of scanning increases, and if the number of times of scanning is 4, the contact angle becomes 20 ° or less of the target. ..
  • the scanning speed is set to 60 mm / s, the number of times of scanning is 1 and the contact angle is 20 ° or less which is the target.
  • the treatment liquid 90 for forming the hydrophilic film 9 with the first lens 11 held by the chucking head 200 from the second lens surface 11b side and the first lens surface 11a facing downward. are transported to a position above the processing tank 100 in which The treatment liquid 90 is water-based, alcohol-based, or water-alcohol-based. In the present embodiment, the treatment liquid 90 is aqueous.
  • the processing bath 100 and the chucking head 200 are moved relative to each other in the vertical direction to immerse the first lens surface 11a side of the first lens 11 in the processing liquid 90.
  • the first lens 11 is treated with the treatment liquid 90 until the first lens 11 is radially outside the effective area 11e of the first lens surface 11a and radially inward of the first side surface portion 116. Soak in. That is, in the first lens 11, the effective area 11e or more of the first lens surface 11a is immersed in the treatment liquid 90, but the first side surface portion 116 is not immersed in the treatment liquid 90.
  • the effective area 11e of the first lens surface 11a is the effective diameter of the first lens surface 11a as a lens.
  • the processing bath 100 and the chucking head 200 are moved relative to each other in the vertical direction to pull up the first lens surface 11a of the first lens 11 from the processing liquid 90.
  • the first lens 11 is rotated around the axis L0 extending along the optical axis L through the first lens surface 11a,
  • the surplus processing liquid 95 is separated from the first lens surface 11a by the centrifugal force.
  • the first lens 11 is rotated around the optical axis L of the first lens 11 (the central optical axis of the first lens 11).
  • the treatment liquid 90 applied to the first lens surface 11a is dried to form the hydrophilic film 9.
  • the first lens surface 11a can be appropriately coated with the hydrophilic film 9.
  • the first lens surface 11a side of the first lens 11 is immersed in the treatment liquid 90, the first lens 11 is radially outside the effective area 11e of the first lens surface 11a, and the first side surface.
  • the first lens 11 is immersed in the treatment liquid 90 to the inside of the portion 116 in the radial direction. Therefore, since the treatment liquid 90 can be applied to the entire area of the first lens surface 11a including the effective area 11e, the hydrophilic film 9 can be applied to the entire area of the first lens surface 11a including the effective area 11e.
  • the treatment liquid 90 may go over the end portion on the first lens surface 11a side (object side end portion 116a) of the first side surface portion 116, the first side surface portion 116 of the first lens surface 11a.
  • the treatment liquid 90 is not applied to the portion of the first side surface portion 116 covered by the caulking portion 75 or the second side surface portion 117. Therefore, it is possible to prevent the hydrophilic film 9 from being coated on the portion of the first side surface portion 116 covered by the caulking portion 75 and the second side surface portion 117.
  • the hydrophilic film 9 is formed such that the film thickness of the side surface portion 110 is thicker than the film thickness of the first lens surface 11a.
  • the hydrophilic film 9 is formed on the side surface portion 110 to have a film thickness that is 2 to 5 times that of the first lens surface 11a. Further, since the treatment liquid is likely to remain at the corner between the first side surface portion 116 and the connecting surface 118, the hydrophilic film 9 is thickly formed at the outer peripheral side end portion 119.
  • the liquid removing step ST5 since the first lens 11 is rotated around the optical axis L passing through the top of the first lens 11, the range in which the processing liquid 90 is applied and the thickness of the processing liquid 90 are applied. Can be controlled around the optical axis L.
  • the treatment liquid 90 can be properly applied, and thus the first lens surface 11 a can be properly coated with the hydrophilic film 9.
  • the first lens surface 11a is a convex spherical surface having a radius of curvature of 10 mm or more and 15 mm or less, even when plasma processing is performed on the first lens surface 11a, plasma is applied to the entire area of the first lens surface 11a. Easy to process.
  • the hydrophilic film 9 is formed on the object-side La surface of the antireflection film 8.
  • the antireflection film 8 is formed on the first lens surface 11a.
  • the present invention may be applied to the case where the hydrophilic film 9 is directly coated on the first lens surface 11a without forming the film 8.
  • the present invention is applied to the lens unit 1 having a lens configuration of 5 groups and 6 elements, but a lens configuration of 3 elements in 3 groups, 4 elements in 4 groups, 5 elements in 6 groups, or 7 elements in 6 groups
  • the present invention may be applied to the lens unit 1 having, for example, and is not limited to the lens configuration or the number of lenses.

Abstract

The purpose of the present invention is to provide a lens unit capable of suitably securing a first lens inside a holder even when a hydrophilic film is applied to a first lens surface, which is the surface of the first lens that faces an object. A lens unit 1 is configured with an antireflection film 8 and a hydrophilic film 9 that are laminated on a first lens surface 11a, which is the surface on the object side La of a first lens 11 closest to the object. The hydrophilic film 9 is formed when the first lens 11 is unassembled. The hydrophilic film 9 is coated on the area that includes the entire area of the first lens surface 11a on the object side La, but excludes a second surface 112 including a second lens surface 11b on the image side Lb and an outermost peripheral surface 115. Thereby, it is possible to minimize the problem that the first lens 11 cannot be inserted into a cylindrical section 77 of a holder 7 for holding the first lens due to a thick hydrophilic film 9 formed on the outermost peripheral surface 115 of the first lens 11 and that the overlapping dimension of a fastening part 75 with respect to an outer peripheral edge portion 119 of the first lens 11 decreases.

Description

レンズユニットLens unit
　本発明は、ホルダに複数のレンズが保持されたレンズユニットに関するものである。 The present invention relates to a lens unit in which a holder holds a plurality of lenses.
　複数のレンズがホルダ内に収容されたレンズユニットにおいて、最も物体側の第１レンズの物体側の第１レンズ面の親水性が低いと、第１レンズ面に水が付着した際、第１レンズ面に細かな水滴が付着してしまう。その結果、レンズユニットを撮像した際、画像の品位が著しく低下してしまう。そこで、レンズユニットの状態で第１レンズ面に真空蒸着を行い、第１レンズ面にシリコン酸化膜等を成膜した後、親水化のための処理液を回転パフ、霧吹き等によって第１レンズ面に塗布し、親水膜を形成する技術が提案されている（特許文献１参照）。かかる技術によれば、第１レンズ面に水が付着しても、水が薄い膜となるので、画像の品位が著しく低下することを抑制することができる。 In a lens unit in which a plurality of lenses are housed in a holder, if the first lens surface on the object side of the first lens on the most object side has low hydrophilicity, when water adheres to the first lens surface, the first lens Small water droplets adhere to the surface. As a result, when the lens unit is imaged, the quality of the image is significantly deteriorated. Therefore, vacuum evaporation is performed on the first lens surface in the state of the lens unit, a silicon oxide film or the like is formed on the first lens surface, and then a treatment liquid for hydrophilization is applied to the first lens surface by rotating puffing, spraying, or the like. There has been proposed a technique for forming a hydrophilic film by coating the same on a substrate (see Patent Document 1). According to such a technique, even if water adheres to the first lens surface, the water becomes a thin film, so that it is possible to prevent the image quality from remarkably deteriorating.
特開２０１５－２３１２１６号公報JP, 2005-231216, A
　しかしながら、特許文献１に記載の技術のように、レンズユニットを組み立てた後、親水膜を形成する方法では、親水膜の形成工程で不具合品が発生すると、レンズユニット全体を廃棄する必要があるため、大きな損失が発生する。また、レンズユニットを分解して組み立て直す場合でも、多大な工数が発生する。従って、レンズユニットを組み立てる前の第１レンズ単体の状態で、第１レンズの物体側の第１レンズ面に親水膜を形成することが好ましいが、その際、親水膜が第１レンズの最も径方向外側の最外周面に対して分厚く形成されると、以下の問題点がある。レンズユニットにおいて、ホルダは、第１レンズの最外周面に径方向外側から重なる第１レンズ保持用筒部を有しており、第１レンズ保持用筒部の物体側端部を第１レンズの外周側端部に物体側から被さるようにカシメすることにより、第１レンズを保持する。このため、親水膜が第１レンズの最外周面に分厚く形成されると、ホルダの第１レンズ保持用筒部に第１レンズを挿入しにくくなるという事態や、挿入できなくなるという事態が発生するという問題点がある。また、ホルダの第１レンズ保持用筒部に第１レンズを挿入できても、第１レンズの外周側端部に対してカシメ部が重なる寸法が小さくなるため、カシメ不足になる虞があるという問題点がある。 However, in the method of forming the hydrophilic film after assembling the lens unit as in the technique described in Patent Document 1, if a defective product is generated in the process of forming the hydrophilic film, it is necessary to discard the entire lens unit. , Big loss will occur. Further, even when the lens unit is disassembled and reassembled, a great number of man-hours are required. Therefore, it is preferable to form a hydrophilic film on the first lens surface of the first lens on the object side of the first lens before assembling the lens unit. At that time, the hydrophilic film has the largest diameter of the first lens. If the outermost peripheral surface on the outer side in the direction is formed thickly, there are the following problems. In the lens unit, the holder has a first lens-holding tubular portion that overlaps the outermost peripheral surface of the first lens from the outside in the radial direction. The object-side end of the first lens-holding tubular portion is attached to the first lens holding portion. The first lens is held by crimping the outer peripheral side end portion from the object side. For this reason, if the hydrophilic film is formed thickly on the outermost peripheral surface of the first lens, it may be difficult or difficult to insert the first lens into the first lens holding cylinder of the holder. There is a problem. Further, even if the first lens can be inserted into the first lens holding cylinder of the holder, the size in which the caulking portion overlaps the outer peripheral side end portion of the first lens is small, so that caulking may be insufficient. There is a problem.
　以上の問題点に鑑みて、本発明の課題は、第１レンズの物体側の第１レンズ面に親水膜を設けた場合でも、第１レンズをホルダの内側に適正に固定することのできるレンズユニットを提供することにある。 In view of the above problems, an object of the present invention is to provide a lens capable of properly fixing the first lens inside the holder even when a hydrophilic film is provided on the object-side first lens surface of the first lens. To provide a unit.
　上記課題を解決するために、本発明に係るレンズユニットの一態様は、複数のレンズと、前記複数のレンズを内側に保持する筒状のホルダと、を有し、前記ホルダは、前記複数のレンズのうち、最も物体側の第１レンズの最も径方向外側の最外周面に径方向外側から重なる第１レンズ保持用筒部と、前記第１レンズ保持用筒部の物体側端部で前記第１レンズの外周側で物体側に向く外周側端部に物体側から被さったカシメ部と、を有し、前記第１レンズには、物体側の第１レンズ面を含み、像側の第２レンズ面、および前記最外周面を除く領域に親水膜がコーティングされていることを特徴とする。 In order to solve the above problems, one aspect of a lens unit according to the present invention includes a plurality of lenses, and a cylindrical holder that holds the plurality of lenses inside, and the holder includes the plurality of lenses. Of the lenses, the first lens-holding tubular portion that overlaps the radially outermost outermost peripheral surface of the first lens closest to the object side from the radially outer side, and the object-side end portion of the first lens-holding tubular portion, The outer peripheral side of the first lens has a caulking portion covered from the object side at an outer peripheral side end facing the object side, and the first lens includes a first lens surface on the object side, and a first lens surface on the image side. A hydrophilic film is coated on the two lens surfaces and the area excluding the outermost peripheral surface.
　本発明において、第１レンズの第１レンズ面には親水膜が設けられているため、第１レンズ面側に水が付着した際、水が薄い膜となって第１レンズ面側に付着する。このため、レンズユニットによって撮像した画像の品位が著しく低下することを抑制することができる。また、親水膜は、第１レンズの最外周面に設けられていないため、親水膜が第１レンズの最も径方向外側の最外周面に対して分厚く形成されることが原因で、ホルダの第１レンズ保持用筒部に第１レンズを挿入できなくなるという事態や、ホルダの第１レンズ保持用筒部に第１レンズを挿入できても、第１レンズの外周側端部に対してカシメ部が重なる寸法が小さくなるという事態が発生しにくい。それ故、第１レンズの物体側の第１レンズ面に親水膜を設けた場合でも、第１レンズをホルダの内側に適正に固定することができる。 In the present invention, since the hydrophilic film is provided on the first lens surface of the first lens, when water adheres to the first lens surface side, the water becomes a thin film and adheres to the first lens surface side. .. Therefore, it is possible to prevent the quality of the image captured by the lens unit from significantly deteriorating. In addition, since the hydrophilic film is not provided on the outermost peripheral surface of the first lens, the hydrophilic film is formed thicker than the outermost peripheral surface of the first lens on the outermost radial direction. Even if the first lens cannot be inserted into the first lens holding cylinder, or even if the first lens can be inserted into the first lens holding cylinder of the holder, the caulked portion is attached to the outer peripheral side end of the first lens. It is unlikely that the overlapping dimension will be small. Therefore, even when the hydrophilic film is provided on the object-side first lens surface of the first lens, the first lens can be properly fixed inside the holder.
　本発明において、前記第１レンズは、前記第１レンズ面と前記第２レンズ面とを繋ぐフランジ部を備え、前記最外周面は、前記フランジ部の最も径方向外側に位置する側面部である態様を採用することができる。 In the present invention, the first lens includes a flange portion that connects the first lens surface and the second lens surface, and the outermost peripheral surface is a side surface portion located on the outermost radial direction of the flange portion. Aspects can be adopted.
　本発明において、前記フランジ部は、前記第１レンズ面の外縁から像側に延在する第１側面部と、前記第１側面部より像側、かつ、前記第１側面部より径方向外側で物体側から像側に向けて延在する第２側面部と、前記第１側面部の像側端部と前記第２側面部の物体側端部とを繋ぐ連結面と、を有し、前記連結面が前記外周側端部であり、前記第２側面部が前記最外周面である態様を採用することができる。 In the present invention, the flange portion is a first side surface portion extending from the outer edge of the first lens surface toward the image side, an image side of the first side surface portion, and a radial outer side of the first side surface portion. A second side surface portion extending from the object side toward the image side; and a connecting surface connecting the image side end portion of the first side surface portion and the object side end portion of the second side surface portion, A mode can be adopted in which the connecting surface is the outer peripheral side end portion and the second side surface portion is the outermost peripheral surface.
　本発明において、前記親水膜は、前記第１レンズ面の全域、および前記第１側面部の一部に設けられている態様を採用することができる。かかる態様によれば、親水膜が第１側面部の一部に設けられている態様であれば、第１レンズ面の全域に親水膜を設けることができる。従って、第１レンズ面の親水膜が存在する領域と、第１レンズ面の親水膜が存在しない領域とにおける反射率や透過率の差が原因で、レンズユニットによって撮像した画像の品位が低下するという事態が発生しにくい。 In the present invention, it is possible to adopt a mode in which the hydrophilic film is provided on the entire area of the first lens surface and a part of the first side surface portion. According to this aspect, if the hydrophilic film is provided on a part of the first side surface portion, the hydrophilic film can be provided on the entire area of the first lens surface. Therefore, the quality of the image captured by the lens unit deteriorates due to the difference in reflectance and transmittance between the region of the first lens surface where the hydrophilic film is present and the region of the first lens surface where the hydrophilic film is not present. That situation is unlikely to occur.
　本発明において、前記カシメ部は、前記第１側面部を部分的に覆い、前記親水膜は、前記第１側面部において前記カシメ部から露出している部分に設けられている態様を採用することができる。かかる態様によれば、親水膜の存在によってカシメ不足等が発生することを抑制することができる。それ故、第１レンズの固定強度の低下や、カシメ部の内側からの水の侵入等を抑制することができる。 In the present invention, the caulking portion may partially cover the first side surface portion, and the hydrophilic film may be provided in a portion of the first side surface portion exposed from the caulking portion. You can According to this aspect, it is possible to suppress the occurrence of insufficient crimping due to the presence of the hydrophilic film. Therefore, it is possible to suppress a decrease in the fixing strength of the first lens and to prevent water from entering from the inside of the crimped portion.
　本発明において、前記第１レンズ面には反射防止膜が設けられ、前記反射防止膜の物体側の面に前記親水膜が設けられている態様を採用することができる。かかる態様によれば、第１レンズ面での反射に起因するゴーストの発生を抑制することができる。 In the present invention, it is possible to adopt a mode in which an antireflection film is provided on the first lens surface, and the hydrophilic film is provided on the object side surface of the antireflection film. According to this aspect, it is possible to suppress the generation of a ghost due to the reflection on the first lens surface.
　本発明において、前記第１レンズ面は、曲率半径が１０ｍｍ以上、かつ、１５ｍｍ以下の凸状の球面である態様を採用することができる。かかる態様によれば、親水膜を形成する際の前処理として、第１レンズ面にプラズマ処理を行う場合でも、第１レンズ面の全域にプラズマ処理を行いやすい。 In the present invention, it is possible to adopt a mode in which the first lens surface is a convex spherical surface having a radius of curvature of 10 mm or more and 15 mm or less. According to this aspect, as a pretreatment for forming the hydrophilic film, even when the plasma treatment is performed on the first lens surface, it is easy to perform the plasma treatment on the entire area of the first lens surface.
　本発明において、前記第１レンズは、ガラスレンズである態様を採用することができる。 In the present invention, the first lens may be a glass lens.
　本発明において、前記親水膜は、酸化シリコンの粒子、および酸化チタン粒子を含む態様を採用することができる。かかる態様によれば、酸化シリコンの粒子によって親水性を高める一方、酸化チタン粒子の光触媒作用によって、第１レンズ面側に付着した有機物からなる汚れを分解することができる。 In the present invention, the hydrophilic film can adopt a mode including particles of silicon oxide and particles of titanium oxide. According to this aspect, while the hydrophilicity is enhanced by the particles of silicon oxide, the photocatalytic action of the titanium oxide particles can decompose the stains made of the organic matter attached to the first lens surface side.
　本発明に係るレンズユニットにおいて、第１レンズの第１レンズ面には親水膜が設けられているため、第１レンズ面側に水が付着した際、水が膜となって第１レンズ面側に付着する。このため、レンズユニットによって撮像した画像の品位が著しく低下することを抑制することができる。また、親水膜は、第１レンズの最外周面に設けられていないため、親水膜が第１レンズの最も径方向外側の最外周面に対して分厚く形成されることが原因で、ホルダの第１レンズ保持用筒部に第１レンズを挿入できなくなるという事態や、ホルダの第１レンズ保持用筒部に第１レンズを挿入できても、第１レンズの外周側端部に対してカシメ部が重なる寸法が小さくなるという事態が発生しにくい。それ故、第１レンズの物体側の第１レンズ面に親水膜を設けた場合でも、第１レンズをホルダの内側に適正に固定することができる。 In the lens unit according to the present invention, since the first lens surface of the first lens is provided with the hydrophilic film, when water adheres to the first lens surface side, the water becomes a film and becomes the first lens surface side. Adhere to. Therefore, it is possible to prevent the quality of the image captured by the lens unit from significantly deteriorating. In addition, since the hydrophilic film is not provided on the outermost peripheral surface of the first lens, the hydrophilic film is formed thicker than the outermost peripheral surface of the first lens on the outermost radial direction. Even if the first lens cannot be inserted into the first lens holding cylinder, or even if the first lens can be inserted into the first lens holding cylinder of the holder, the caulked portion is attached to the outer peripheral side end of the first lens. It is unlikely that the overlapping dimension will be small. Therefore, even when the hydrophilic film is provided on the object-side first lens surface of the first lens, the first lens can be properly fixed inside the holder.
本発明を適用したレンズユニットの一態様を示す断面図。Sectional drawing which shows the one aspect | mode of the lens unit to which this invention is applied. 図１に示す第１レンズのフランジ部等を拡大して示す断面図。Sectional drawing which expands and shows the flange part etc. of the 1st lens shown in FIG. 図２に示す親水膜の効果を示す説明図。Explanatory drawing which shows the effect of the hydrophilic film shown in FIG. 本発明に係るコーティング方法の一態様を示す説明図。Explanatory drawing which shows one aspect of the coating method which concerns on this invention. 図４に示すプラズマ照射工程の条件と、第１レンズ面側における水の接触角との関係を示すグラフ。The graph which shows the relationship of the conditions of the plasma irradiation process shown in FIG. 4, and the contact angle of water on the 1st lens surface side. 図４に示す浸漬工程における第１レンズの浸漬深さの説明図。Explanatory drawing of the immersion depth of the 1st lens in the immersion process shown in FIG.
　図面を参照して、本発明の実施の形態を説明する。なお、以下の説明で参照する図においては、各部材を図面上で認識可能な程度の大きさとするため、各部材の数や縮尺を異ならしめてある。また、以下の説明では、光軸Ｌが延在している方向において、物体側にＬａを付し、像側にＬｂを付して説明する。 Embodiments of the present invention will be described with reference to the drawings. In the drawings referred to in the following description, the number and scale of each member are different in order to make each member recognizable in the drawings. In the following description, La is attached to the object side and Lb is attached to the image side in the direction in which the optical axis L extends.
（レンズユニットの構成）
　図１は、本発明を適用したレンズユニット１の一態様を示す断面図であり、レンズユニット１は、光軸Ｌ周りの全体にわたって略同様な構成を有している。図１に示すレンズユニット１は、光軸Ｌ方向に複数のレンズが配置された広角レンズ１０と、広角レンズ１０を内側に保持する筒状のホルダ７とを有しており、撮像装置等の光学装置に用いられる。本実施形態において、ホルダ７は遮光性樹脂製である。 (Lens unit configuration)
FIG. 1 is a cross-sectional view showing one mode of a lens unit 1 to which the present invention is applied, and the lens unit 1 has a substantially similar configuration over the entire optical axis L. The lens unit 1 shown in FIG. 1 includes a wide-angle lens 10 in which a plurality of lenses are arranged in the optical axis L direction, and a cylindrical holder 7 that holds the wide-angle lens 10 inside, and is used in an imaging device or the like. Used in optical devices. In this embodiment, the holder 7 is made of light-shielding resin.
　広角レンズ１０は、例えば、５群６枚のレンズ構成を備えている。より具体的には、広角レンズ１０は、物体側Ｌａ（被写体側／前側）から像側Ｌｂに向けて、負のパワーを持つ第１レンズ１１と、負のパワーを持つ第２レンズ１２と、正または負のパワーを持つ第３レンズ１３と、正のパワーを有する第４レンズ１４と、正のパワーを有する接合レンズ１７（第５レンズ１５および第６レンズ１６）とを有している。 The wide-angle lens 10 has, for example, a lens configuration of 6 elements in 5 groups. More specifically, the wide-angle lens 10 includes a first lens 11 having negative power, a second lens 12 having negative power, from the object side La (subject side / front side) toward the image side Lb. It has a third lens 13 having positive or negative power, a fourth lens 14 having positive power, and a cemented lens 17 (fifth lens 15 and sixth lens 16) having positive power.
　第２レンズ１２および第３レンズ１３はプラスチックレンズである。第４レンズ１４はガラスレンズである。接合レンズ１７は、負のパワーを有するプラスチックレンズである第５レンズ１５と、正のパワーを有するプラスチックレンズである第６レンズ１６との接合レンズである。レンズユニット１は、第２レンズ１２と第３レンズ１３との間に円環状の遮光シート２を有し、第３レンズ１３と第４レンズ１４との間に円環状の絞り３を有している。また、レンズユニット１は、接合レンズ１７より像側Ｌｂに赤外線カットフィルタ４を有している。 The second lens 12 and the third lens 13 are plastic lenses. The fourth lens 14 is a glass lens. The cemented lens 17 is a cemented lens of a fifth lens 15 which is a plastic lens having a negative power and a sixth lens 16 which is a plastic lens having a positive power. The lens unit 1 has an annular light shielding sheet 2 between the second lens 12 and the third lens 13, and an annular diaphragm 3 between the third lens 13 and the fourth lens 14. There is. Further, the lens unit 1 has an infrared cut filter 4 on the image side Lb side of the cemented lens 17.
（第１レンズ１１の構成）
　第１レンズ１１はガラスレンズまたはプラスチックレンズであり、本実施形態において、第１レンズ１１はガラスレンズである。第１レンズ１１は、メニスカスレンズである。より具体的には、第１レンズ１１は、物体側Ｌａの第１レンズ面１１ａが物体側Ｌａに向けて突出した凸曲面になっており、像側Ｌｂの第２レンズ面１１ｂは、物体側Ｌａに向けて凹んだ凹曲面になっており、第１レンズ面１１ａと第２レンズ面１１ｂとはフランジ部１１ｃによって繋がっている。本実施形態において、第１レンズ面１１ａは、曲率半径が１０ｍｍ以上、かつ、１５ｍｍ以下の凸状の球面である。 (Structure of the first lens 11)
The first lens 11 is a glass lens or a plastic lens, and in the present embodiment, the first lens 11 is a glass lens. The first lens 11 is a meniscus lens. More specifically, in the first lens 11, the first lens surface 11a on the object side La is a convex curved surface protruding toward the object side La, and the second lens surface 11b on the image side Lb is the object side. It has a concave curved surface that is concave toward La, and the first lens surface 11a and the second lens surface 11b are connected by a flange portion 11c. In the present embodiment, the first lens surface 11a is a convex spherical surface having a radius of curvature of 10 mm or more and 15 mm or less.
　第１レンズ１１では、物体側Ｌａの第１面１１１の全体が第１レンズ面１１ａになっており、像側Ｌｂの第２面１１２は、光軸Ｌが通る中央部分のみが第２レンズ面１１ｂになっている。従って、第２面１１２のうち、第２レンズ面１１ｂの外周側に位置する部分では、光軸Ｌに直交するフランジ部１１ｃの像側Ｌｂの面になっている。第１レンズ１１の径方向の最も径方向外側の最外周面１１５は、フランジ部１１ｃの側面部１１０のうち、後述する第２側面部１１７である。 In the first lens 11, the entire first surface 111 on the object side La is the first lens surface 11a, and the second surface 112 on the image side Lb is the second lens surface only in the central portion through which the optical axis L passes. It is 11b. Therefore, a portion of the second surface 112 located on the outer peripheral side of the second lens surface 11b is a surface on the image side Lb of the flange portion 11c orthogonal to the optical axis L. The radially outermost outermost peripheral surface 115 of the first lens 11 in the radial direction is a second side surface portion 117, which will be described later, of the side surface portion 110 of the flange portion 11c.
（ホルダ７等の構成）
　第１レンズ１１は、第２レンズ１２、第３レンズ１３、第４レンズ１４、および接合レンズ１７より外径が大きい。第２レンズ１２、第３レンズ１３および接合レンズ１７は外径が略等しく、接合レンズ１７において、第５レンズ１５は、第６レンズ１６より外形が大きい。第４レンズ１４は、第２レンズ１２等より外径が小さい。 (Structure of holder 7 etc.)
The first lens 11 has a larger outer diameter than the second lens 12, the third lens 13, the fourth lens 14, and the cemented lens 17. The second lens 12, the third lens 13, and the cemented lens 17 have substantially the same outer diameter, and in the cemented lens 17, the fifth lens 15 has a larger outer shape than the sixth lens 16. The outer diameter of the fourth lens 14 is smaller than that of the second lens 12 and the like.
　かかる形状に対応して、ホルダ７は、最も物体側Ｌａで第１レンズ１１の周りを囲む第１レンズ保持用筒部７０と、第１レンズ保持用筒部７０から像側Ｌｂに向けて延在する第１筒部７１と、第１筒部７１から像側Ｌｂに向けて延在する第２筒部７２と、第２筒部７２の像側Ｌｂの端部で径方向内側に張り出した張出部７３とを有している。第１レンズ保持用筒部７０は、第１レンズ１１の径方向の最も径方向外側の最外周面１１５に径方向外側から重なっている。第２筒部７２には、肉盗み用の環状の凹部７２０が形成されている。 Corresponding to such a shape, the holder 7 extends from the first lens holding tubular portion 70 toward the image side Lb, and the first lens holding tubular portion 70 that surrounds the first lens 11 on the most object side La. The first tubular portion 71 that exists, the second tubular portion 72 that extends from the first tubular portion 71 toward the image side Lb, and the end portion of the second tubular portion 72 on the image side Lb that projects radially inward. And an overhang portion 73. The first lens holding tubular portion 70 overlaps the radially outermost outermost peripheral surface 115 of the first lens 11 from the radially outer side. An annular recess 720 for stealing meat is formed in the second tubular portion 72.
　第１筒部７１と第２筒部７２とは内径が等しく、第１レンズ保持用筒部７０は、第１筒部７１および第２筒部７２より内径が大きい。従って、第１レンズ保持用筒部７０の内周面と第１筒部７１の内周面との間には、物体側Ｌａに向いた環状の段部７４が形成されている。段部７４には環状の溝７４０が形成されており、溝７４０の内側に環状のシール部材５が配置されている。第２筒部７２の内周面には、光軸Ｌ方向の途中位置で径方向内側に張り出して物体側Ｌａに向いた環状の段部７２１が形成されている。 The inner diameters of the first tubular portion 71 and the second tubular portion 72 are equal, and the inner diameter of the first lens holding tubular portion 70 is larger than that of the first tubular portion 71 and the second tubular portion 72. Therefore, an annular step portion 74 facing the object side La is formed between the inner circumferential surface of the first lens holding tubular portion 70 and the inner circumferential surface of the first tubular portion 71. An annular groove 740 is formed in the step portion 74, and the annular seal member 5 is arranged inside the groove 740. An annular step portion 721 is formed on the inner peripheral surface of the second tubular portion 72 so as to project radially inward at an intermediate position in the optical axis L direction and face the object side La.
　かかる構成のホルダ７に対して、第５レンズ１５のフランジ部１５５は、段部７２１に物体側Ｌａから当接している。第４レンズ１４は、レンズバレル６に保持されており、レンズバレル６は、第５レンズ１５のフランジ部１５５に物体側Ｌａから当接している。第３レンズ１３のフランジ部１３５は、レンズバレル６に絞り３を介して物体側Ｌａから当接している。第２レンズ１２のフランジ部１２５は、第３レンズ１３のフランジ部１３５に遮光シート２を介して物体側Ｌａから当接している。 With respect to the holder 7 having such a configuration, the flange portion 155 of the fifth lens 15 is in contact with the step portion 721 from the object side La. The fourth lens 14 is held by the lens barrel 6, and the lens barrel 6 is in contact with the flange portion 155 of the fifth lens 15 from the object side La. The flange portion 135 of the third lens 13 is in contact with the lens barrel 6 from the object side La via the diaphragm 3. The flange portion 125 of the second lens 12 is in contact with the flange portion 135 of the third lens 13 from the object side La via the light shielding sheet 2.
　第２レンズ１２のフランジ部１２５には、第１筒部７１の内周面の物体側Ｌａの端部を径方向内側に塑性変形させたカシメ部７５が物体側Ｌａから被さって第２レンズ１２の物体側Ｌａへの移動が規制されている。その結果、第２レンズ１２、遮光シート２、第３レンズ１３、絞り３、第４レンズ１４、および接合レンズ１７が第１筒部７１および第２筒部７２の内部に保持されている。 The flange portion 125 of the second lens 12 is covered with a caulking portion 75 formed by plastically deforming the end portion of the inner peripheral surface of the first cylindrical portion 71 on the object side La inward in the radial direction from the object side La. Is restricted from moving to the object side La. As a result, the second lens 12, the light shielding sheet 2, the third lens 13, the diaphragm 3, the fourth lens 14, and the cemented lens 17 are held inside the first tubular portion 71 and the second tubular portion 72.
（第１レンズ１の固定構造）
　図２は、図１に示す第１レンズ１１のフランジ部１１ｃ等を拡大して示す断面図であり、第１レンズ１１は、光軸Ｌ周りの全体にわたって略同様な構成を有している。図２に示すように、ホルダ７は、第１レンズ保持用筒部７０の内側に第１レンズ１１を固定するカシメ部７５を有している。カシメ部７５は、第１レンズ保持用筒部７０の物体側Ｌａの端部に形成されていた環状のリブ（図示せず）を加熱して、第１レンズ１１の外周側で物体側Ｌａに向く外周側端部１１９に物体側Ｌａから被さるように径方向内側に塑性変形させた部分である。この状態で、第１レンズ１１の像側Ｌｂの面である第２面１１２は、段部７４に当接し、光軸Ｌ方向で位置決めされている。また、第１レンズ１１の第２面１１２は、環状のシール部材５に物体側Ｌａから当接し、第１レンズ１１の第２面１１２とホルダ７との間がシール部材５によってシールされる。本実施形態では、第１レンズ１１の第２面１１２には、第２レンズ面１１ｂの外周側に遮光層（図示せず）が形成されている。 (Fixed structure of the first lens 1)
FIG. 2 is an enlarged cross-sectional view showing the flange portion 11c and the like of the first lens 11 shown in FIG. 1, and the first lens 11 has a substantially similar configuration over the entire optical axis L. As shown in FIG. 2, the holder 7 has a caulking portion 75 that fixes the first lens 11 inside the first lens holding tubular portion 70. The caulking portion 75 heats an annular rib (not shown) formed at the end portion of the first lens holding tubular portion 70 on the object side La, and moves to the object side La on the outer peripheral side of the first lens 11. It is a portion that is plastically deformed inward in the radial direction so as to cover the facing outer peripheral end 119 from the object side La. In this state, the second surface 112, which is the image-side Lb surface of the first lens 11, abuts on the step portion 74 and is positioned in the optical axis L direction. The second surface 112 of the first lens 11 abuts the annular seal member 5 from the object side La, and the seal member 5 seals between the second surface 112 of the first lens 11 and the holder 7. In the present embodiment, a light blocking layer (not shown) is formed on the second surface 112 of the first lens 11 on the outer peripheral side of the second lens surface 11b.
　カシメ部７５を利用した固定構造を採用するにあたって、第１レンズ１１のフランジ部１１ｃは、第１レンズ面１１ａの外縁から像側Ｌｂに向けて延在する第１側面部１１６と、第１側面部１１６より像側Ｌｂ、かつ、第１側面部１１６より径方向外側で物体側Ｌａから像側Ｌｂに向けて延在する第２側面部１１７と、第１側面部１１６の像側端部１１６ｂと第２側面部１１７の物体側端部１１７ａとを繋げる連結面１１８とが設けられている。連結面１１８は、カシメ部７５が物体側Ｌａから被さる外周側端部１１９であり、第２側面部１１７は、第１レンズ保持用筒部７０が径方向外側から重なる第１レンズ１１の最外周面１１５である。 When adopting the fixing structure using the caulking portion 75, the flange portion 11c of the first lens 11 includes the first side surface portion 116 extending from the outer edge of the first lens surface 11a toward the image side Lb, and the first side surface. A second side surface portion 117 extending from the object side La toward the image side Lb on the image side Lb side of the portion 116 and radially outward of the first side surface portion 116, and an image side end portion 116b of the first side surface portion 116. And a connection surface 118 that connects the object-side end 117a of the second side surface 117 to each other. The connecting surface 118 is an outer peripheral side end 119 that the caulking portion 75 covers from the object side La, and the second side surface portion 117 is the outermost periphery of the first lens 11 where the first lens holding tubular portion 70 overlaps from the radially outer side. This is the surface 115.
　第１側面部１１６および第２側面部１１７は、光軸Ｌに略平行に延在しており、第２側面部１１７の周りを第１レンズ保持用筒部７０が囲んでいる。連結面１１８は、光軸Ｌに対して３０°から７０°の角度を成すように傾いた傾斜面からなる。 The first side surface portion 116 and the second side surface portion 117 extend substantially parallel to the optical axis L, and the first lens holding cylinder portion 70 surrounds the second side surface portion 117. The connecting surface 118 is an inclined surface that is inclined to form an angle of 30 ° to 70 ° with respect to the optical axis L.
　カシメ部７５は、全周にわたって、第１レンズ保持用筒部７０の物体側Ｌａの端部から連結面１１８に被さるように径方向内側に斜めに傾くように形成されており、連結面１１８に物体側Ｌａから被さっている。ここで、カシメ部７５の径方向内側端部７５０は、周方向のいずれの個所でも、第１レンズ１１の物体側Ｌａの面（第１面１１１）を径方向外側に延長させた仮想の延長面Ｓより像側Ｌｂに位置する。 The caulking portion 75 is formed so as to incline radially inward so as to cover the coupling surface 118 from the end on the object side La of the first lens holding tubular portion 70 over the entire circumference. It is covered from the object side La. Here, the radial inner end 750 of the crimped portion 75 is a virtual extension obtained by extending the surface (first surface 111) of the first lens 11 on the object side La to the radial outer side at any position in the circumferential direction. It is located on the image side Lb with respect to the surface S.
　本実施形態において、カシメ部７５の径方向内側端部７５０は、全周にわたって、第１側面部１１６を部分的に被さっている。本実施形態において、カシメ部７５の径方向内側端部７５０は、第１側面部１１６に沿うように物体側Ｌａに突出して第１側面部１１６に径方向外側から被さった突出部７５１を有しており、突出部７５１は、第１側面部１１６の物体側端部１１６ａから像側Ｌｂに離間する位置に被さっている。このため、突出部７５１は、全周にわたって第１側面部１１６に部分的に重なっており、第１側面部１１６のうち、突出部７５１より物体側Ｌａに位置する部分１１６ｃは、カシメ部７５から露出している。 In the present embodiment, the radially inner end 750 of the caulking portion 75 partially covers the first side surface portion 116 over the entire circumference. In the present embodiment, the radially inner end 750 of the caulking portion 75 has a protruding portion 751 that protrudes toward the object side La along the first side surface portion 116 and covers the first side surface portion 116 from the radially outer side. Thus, the projecting portion 751 covers the position of the first side surface portion 116 away from the object side end portion 116a toward the image side Lb. Therefore, the projecting portion 751 partially overlaps the first side surface portion 116 over the entire circumference, and the portion 116c of the first side surface portion 116 located on the object side La with respect to the projecting portion 751 is separated from the caulking portion 75. Exposed.
（反射防止膜８の構成）
　図２に示すように、第１レンズ１１の第１レンズ面１１ａ（第１面１１１）には、全域にわたって反射防止膜８が積層されている。従って、レンズユニット１で撮像した画像に、第１レンズ面１１ａでの反射に起因するゴーストが発生することを抑制することができる。 (Structure of antireflection film 8)
As shown in FIG. 2, the antireflection film 8 is laminated over the entire area of the first lens surface 11 a (first surface 111) of the first lens 11. Therefore, it is possible to suppress the occurrence of a ghost due to the reflection on the first lens surface 11a in the image captured by the lens unit 1.
　反射防止膜８は、屈折率が異なる誘電体層が交互に積層された誘電体多層膜からなる。本実施形態において、反射防止膜８は、例えば、酸化シリコン膜と酸化チタン膜とが交互に蒸着された積層膜であり、最も物体側Ｌａは酸化シリコン膜からなる。酸化シリコン膜は、波長５３０ｎｍの光に対する屈折率が１．４６１１であり、酸化チタン膜は、波長５３０ｎｍの光に対する屈折率が２．３４６６である。 The antireflection film 8 is composed of a dielectric multilayer film in which dielectric layers having different refractive indexes are alternately laminated. In the present embodiment, the antireflection film 8 is, for example, a laminated film in which a silicon oxide film and a titanium oxide film are alternately deposited, and the most object side La is a silicon oxide film. The silicon oxide film has a refractive index of 1.4611 for light with a wavelength of 530 nm, and the titanium oxide film has a refractive index of 2.3466 for light with a wavelength of 530 nm.
　本実施形態において、反射防止膜８は、第１レンズ１１単体の状態で形成された膜であり、ホルダ７には形成されていない。反射防止膜８は、第１レンズ１１の第１レンズ面１１ａ（第１面１１１）の全域にわたって形成されているが、フランジ部１１ｃの側面部１１０（第１側面部１１６、第２側面部１１７、および連結面１１８）、および第２面１１２には形成されていない。 In the present embodiment, the antireflection film 8 is a film formed in the state of the first lens 11 alone, and is not formed on the holder 7. Although the antireflection film 8 is formed over the entire area of the first lens surface 11a (first surface 111) of the first lens 11, the side surface portion 110 (first side surface portion 116, second side surface portion 117) of the flange portion 11c is formed. , And the connecting surface 118) and the second surface 112 are not formed.
（親水膜９の構成）
　図３は、図２に示す親水膜９の効果を示す説明図であり、親水膜９を形成しない場合の第１レンズ面１１ａの画像（ａ）、および親水膜９を形成した場合の第１レンズ面１１ａの画像（ｂ）を示してある。 (Structure of hydrophilic film 9)
FIG. 3 is an explanatory diagram showing the effect of the hydrophilic film 9 shown in FIG. 2, and is an image (a) of the first lens surface 11 a when the hydrophilic film 9 is not formed and a first image when the hydrophilic film 9 is formed. An image (b) of the lens surface 11a is shown.
　図２に示すように、反射防止膜８の物体側Ｌａの面には親水膜９がコーティングされている。本実施形態において、親水膜９は、反射防止膜８に積層されていることから、反射防止膜８とともに誘電体多層膜の一部を構成する。従って、親水膜９が反射防止膜８の特性を低下しないように屈折率や膜厚が設定される。本実施形態において、親水膜９は、波長５３０ｎｍの光に対する屈折率が１．５から１．７であり、膜厚は３０ｎｍから１００ｎｍである。 As shown in FIG. 2, the surface of the antireflection film 8 on the object side La is coated with a hydrophilic film 9. In this embodiment, since the hydrophilic film 9 is laminated on the antireflection film 8, it constitutes a part of the dielectric multilayer film together with the antireflection film 8. Therefore, the refractive index and the film thickness are set so that the hydrophilic film 9 does not deteriorate the characteristics of the antireflection film 8. In this embodiment, the hydrophilic film 9 has a refractive index of 1.5 to 1.7 for light having a wavelength of 530 nm and a film thickness of 30 nm to 100 nm.
　親水膜９は、例えば、酸化シリコンの粒子、および酸化チタン粒子を含むコーティング層である。従って、酸化シリコンの粒子が有する親水性のシラノール基によって第１レンズ面１１ａの親水性を高める一方、酸化チタン粒子の光触媒作用によって、第１レンズ面１１ａに付着した有機物からなる汚れを分解することができる。 The hydrophilic film 9 is, for example, a coating layer containing silicon oxide particles and titanium oxide particles. Therefore, the hydrophilic silanol group of the silicon oxide particles enhances the hydrophilicity of the first lens surface 11a, while the photocatalytic action of the titanium oxide particles decomposes the organic contaminants adhering to the first lens surface 11a. You can
　他の親水膜９の構成例として、例えば、親水膜９は、シリカ粒子と、酸化チタン粒子と、シリカ微粒子とを含有する。シリカ微粒子の平均粒径は、シリカ粒子の平均粒径よりも小さい。本実施形態の第１レンズ１１において、シリカ粒子、酸化チタン粒子およびシリカ微粒子は、反射防止膜８の表面に互いに分散して付着している。本実施形態の第１レンズ１１において、親水膜９は、シリカ粒子および酸化チタン粒子を含有するため、高い親水性を示す。また、使用によって親水膜９の親水性が低下しても、親水膜９に光（紫外光）を照射することにより、親水膜９の親水性を回復できる。さらに、親水膜９はシリカ微粒子を含有するため、親水膜９の表面粗さを低減でき、第１レンズ１１の耐摩耗性を向上できる。例えば一例として、シリカ粒子の平均粒径は１ｎｍ以上２００ｎｍ以下、酸化チタン粒子の平均粒径は１ｎｍ以上かつ１００ｎｍ以下、シリカ微粒子の平均粒径は０．５ｎｍ以上かつ１０ｎｍ以下である。 As another structural example of the hydrophilic film 9, for example, the hydrophilic film 9 contains silica particles, titanium oxide particles, and silica fine particles. The average particle size of the silica fine particles is smaller than the average particle size of the silica particles. In the first lens 11 of the present embodiment, the silica particles, the titanium oxide particles and the silica fine particles are dispersed and attached to the surface of the antireflection film 8. In the first lens 11 of the present embodiment, the hydrophilic film 9 contains silica particles and titanium oxide particles, and thus exhibits high hydrophilicity. Further, even if the hydrophilicity of the hydrophilic film 9 is lowered by use, the hydrophilicity of the hydrophilic film 9 can be recovered by irradiating the hydrophilic film 9 with light (ultraviolet light). Further, since the hydrophilic film 9 contains silica fine particles, the surface roughness of the hydrophilic film 9 can be reduced and the wear resistance of the first lens 11 can be improved. For example, the average particle size of silica particles is 1 nm or more and 200 nm or less, the average particle size of titanium oxide particles is 1 nm or more and 100 nm or less, and the average particle size of silica fine particles is 0.5 nm or more and 10 nm or less.
　また、シリカ粒子は、中空シリカ粒子またはポーラスシリカ粒子を含むことが好ましい。シリカ粒子が中空シリカ粒子またはポーラスシリカ粒子を含むことにより、親水膜９に対する水滴の接触角を長期間にわたって１０°以下に維持できる。このように、シリカ粒子が中空シリカ粒子またはポーラスシリカ粒子を含むことにより、親水膜９の親水性をさらに向上できる。例えば、中空シリカ粒子は、内部に空間を有する。中空シリカ粒子は、コア粒子をゾルゲル法でシリカコーティングした後でコア粒子を溶解させることで形成できる。一例としては、炭酸カルシウムからなるコア粒子をシリカでコーティングした後で、酸でコア粒子を溶解させることにより、中空シリカ粒子を形成できる。また、ポーラスシリカ粒子は、メソ孔を有する。メソ孔の大きさは０．１ｎｍ以上かつ１１９ｎｍ以下である。例えば、ポーラスシリカ粒子は、ゾルゲル反応によって形成される。 Also, the silica particles preferably include hollow silica particles or porous silica particles. Since the silica particles include the hollow silica particles or the porous silica particles, the contact angle of the water droplet with respect to the hydrophilic film 9 can be maintained at 10 ° or less for a long period of time. In this way, the hydrophilicity of the hydrophilic film 9 can be further improved by containing the hollow silica particles or the porous silica particles in the silica particles. For example, hollow silica particles have a space inside. The hollow silica particles can be formed by dissolving the core particles after coating the core particles with silica by a sol-gel method. As an example, hollow silica particles can be formed by coating core particles made of calcium carbonate with silica and then dissolving the core particles with an acid. In addition, the porous silica particles have mesopores. The size of the mesopores is 0.1 nm or more and 119 nm or less. For example, porous silica particles are formed by a sol-gel reaction.
　さらに、他の親水膜９の構成例として、例えば、親水膜９は、シリカ粒子と、酸化チタン粒子と、ニオブ化合物粒子とを含有する。本実施形態の第１レンズ１１において、シリカ粒子、酸化チタン粒子およびニオブ化合物粒子は、反射防止膜８の表面に互いに分散して付着している。本実施形態の第１レンズ１１において、親水膜９は、シリカ粒子および酸化チタン粒子を含有するため、高い親水性を示す。また、使用によって親水膜９の親水性が低下しても、親水膜９に光（紫外光）を照射することにより、親水膜９の親水性を回復できる。さらに、親水膜９はニオブ化合物粒子を含有するため、第１レンズ１１の耐摩耗性を向上できる。この場合であっても、シリカ粒子は、中空シリカ粒子またはポーラスシリカ粒子を含むことが好ましい。シリカ粒子が中空シリカ粒子またはポーラスシリカ粒子を含むことにより、親水膜９に対する水滴の接触角を長期間にわたって１０°以下に維持できる。例えば一例として、シリカ粒子の平均粒径は１ｎｍ以上かつ２００ｎｍ以下、酸化チタン粒子の平均粒径は１ｎｍ以上かつ１００ｎｍ以下である。 Further, as another configuration example of the hydrophilic film 9, for example, the hydrophilic film 9 contains silica particles, titanium oxide particles, and niobium compound particles. In the first lens 11 of this embodiment, the silica particles, the titanium oxide particles, and the niobium compound particles are dispersed and attached to the surface of the antireflection film 8. In the first lens 11 of the present embodiment, the hydrophilic film 9 contains silica particles and titanium oxide particles, and thus exhibits high hydrophilicity. Further, even if the hydrophilicity of the hydrophilic film 9 is lowered by use, the hydrophilicity of the hydrophilic film 9 can be recovered by irradiating the hydrophilic film 9 with light (ultraviolet light). Further, since the hydrophilic film 9 contains the niobium compound particles, the wear resistance of the first lens 11 can be improved. Even in this case, the silica particles preferably include hollow silica particles or porous silica particles. Since the silica particles include the hollow silica particles or the porous silica particles, the contact angle of the water droplet with respect to the hydrophilic film 9 can be maintained at 10 ° or less for a long period of time. For example, the average particle size of silica particles is 1 nm or more and 200 nm or less, and the average particle size of titanium oxide particles is 1 nm or more and 100 nm or less.
　親水膜９を設けない場合、図３の画像（ａ）から分かるように、第１レンズ面１１ａ側に水が付着した際に、第１レンズ面１１ａに細かな水滴が付着してしまい、レンズユニット１で撮像した画像の品位が著しく低下してしまう。これに対して、本実施形態では、第１レンズ面１１ａに親水膜９が設けられているため、図３の画像（ｂ）から分かるように、第１レンズ面１１ａ側に水が付着した際、水が薄い膜となるため、レンズユニット１によって撮像した画像の品位が著しく低下することを抑制することができる。 When the hydrophilic film 9 is not provided, as can be seen from the image (a) in FIG. 3, when water adheres to the first lens surface 11a side, fine water droplets adhere to the first lens surface 11a, and The quality of the image captured by the unit 1 is significantly deteriorated. On the other hand, in this embodiment, since the hydrophilic film 9 is provided on the first lens surface 11a, when water adheres to the first lens surface 11a side, as can be seen from the image (b) of FIG. Since the water becomes a thin film, it is possible to prevent the quality of the image captured by the lens unit 1 from being significantly deteriorated.
　親水膜９は、第１レンズ１１単体の状態で形成された膜であり、ホルダ７にはコーティングされていない。また、親水膜９は、第１レンズ面１１ａの全域を含み、第２レンズ面１１ｂを含む第２面１１２、および最外周面１１５を除く領域にコーティングされている。すなわち、親水膜９は、第１レンズ面１１ａの全域にコーティングされているが、第２レンズ面１１ｂを含む第２面１１２、および最外周面１１５にはコーティングされていない。また、親水膜９は、連結面１１８にも形成されていない。但し、親水膜９は、第１側面部１１６の一部には設けられている。より具体的には、親水膜９は、第１側面部１１６においてカシメ部７５の径方向内側端部７５０から露出している部分１１６ｃにも設けられている。 The hydrophilic film 9 is a film formed in the state of the first lens 11 alone, and is not coated on the holder 7. Further, the hydrophilic film 9 is coated on the entire area of the first lens surface 11a and on the second surface 112 including the second lens surface 11b and the area excluding the outermost peripheral surface 115. That is, the hydrophilic film 9 is coated on the entire area of the first lens surface 11a, but is not coated on the second surface 112 including the second lens surface 11b and the outermost peripheral surface 115. Further, the hydrophilic film 9 is not formed on the connecting surface 118 either. However, the hydrophilic film 9 is provided on a part of the first side surface portion 116. More specifically, the hydrophilic film 9 is also provided on the portion 116c of the first side surface portion 116 exposed from the radially inner end 750 of the caulking portion 75.
　このように本実施形態では、親水膜９が第１レンズ１１単体の状態で形成されるため、例えば、親水膜９の形成工程で不具合品が発生した場合でも、レンズユニット１の廃棄等を行わなくてもよい。また、親水膜９が第１レンズ１１の最外周面１１５に設けられていないため、親水膜９が第１レンズ１１の最外周面１１５に対して分厚く形成されることが原因で、ホルダ７の第１レンズ保持用筒部７０に第１レンズ１１を挿入できなくなるという事態や、ホルダ７の第１レンズ保持用筒部７０に第１レンズ１１を挿入できても、第１レンズ１１の外周側端部１１９に対してカシメ部７５が重なる寸法が小さくなるという事態が発生しにくい。それ故、第１レンズ１１の第１レンズ面１１ａに親水膜９を設けた場合でも、第１レンズ１１をホルダ７の内側に適正に固定することができる。 As described above, in this embodiment, since the hydrophilic film 9 is formed in the state of the first lens 11 alone, for example, even if a defective product is generated in the process of forming the hydrophilic film 9, the lens unit 1 is discarded. You don't have to. Further, since the hydrophilic film 9 is not provided on the outermost peripheral surface 115 of the first lens 11, the hydrophilic film 9 is formed thicker than the outermost peripheral surface 115 of the first lens 11, so that Even if the first lens 11 cannot be inserted into the first lens holding tubular portion 70, or even if the first lens 11 can be inserted into the first lens holding tubular portion 70 of the holder 7, the outer peripheral side of the first lens 11 It is unlikely that the size in which the crimped portion 75 overlaps the end portion 119 becomes small. Therefore, even when the hydrophilic film 9 is provided on the first lens surface 11a of the first lens 11, the first lens 11 can be properly fixed inside the holder 7.
　また、親水膜９は、第１レンズ面１１ａから第１側面部１１６の一部まで設けられているため、第１レンズ面１１ａの全域に親水膜９を形成することができる。従って、第１レンズ面１１ａの親水膜９が存在する領域と、第１レンズ面１１ａの親水膜９が存在しない領域とにおける反射率や透過率の差が原因で、レンズユニット１によって撮像した画像の品位が低下するという事態が発生しにくい。この場合でも、親水膜９は、第１側面部１１６のうち、カシメ部７５の径方向内側端部７５０から露出している部分に設けられているため、親水膜９の存在によってカシメ不足等が発生することを抑制することができる。それ故、第１レンズ１１の固定強度の低下や、カシメ部７５の内側からの水の侵入等を抑制することができる。 Further, since the hydrophilic film 9 is provided from the first lens surface 11a to a part of the first side surface portion 116, the hydrophilic film 9 can be formed over the entire area of the first lens surface 11a. Therefore, the image captured by the lens unit 1 is caused by the difference in reflectance or transmittance between the region of the first lens surface 11a where the hydrophilic film 9 is present and the region of the first lens surface 11a where the hydrophilic film 9 is not present. It is unlikely that the quality of the product will deteriorate. Even in this case, since the hydrophilic film 9 is provided on the portion of the first side surface portion 116 exposed from the radially inner end 750 of the caulking portion 75, the presence of the hydrophilic film 9 may cause insufficient caulking or the like. It is possible to suppress the occurrence. Therefore, it is possible to prevent the fixing strength of the first lens 11 from decreasing and the intrusion of water from the inside of the caulking portion 75.
（親水膜９のコーティング方法）
　図４は、本発明に係るコーティング方法の一態様を示す説明図である。図５は、図４に示すプラズマ照射工程ＳＴ１の条件と、第１レンズ面１１ａ側における水の接触角との関係を示すグラフである。図６は、図４に示す浸漬工程ＳＴ３における第１レンズ１１の浸漬深さの説明図である。 (Coating method of hydrophilic film 9)
FIG. 4 is an explanatory view showing one aspect of the coating method according to the present invention. FIG. 5 is a graph showing the relationship between the conditions of the plasma irradiation step ST1 shown in FIG. 4 and the contact angle of water on the first lens surface 11a side. FIG. 6 is an explanatory diagram of the immersion depth of the first lens 11 in the immersion step ST3 shown in FIG.
　本実施形態では、図２に示すように、第１レンズ１１に親水膜９をコーティングするにあたっては、まず、第１レンズ１１の第１レンズ面１１ａに反射防止膜８を形成した後、図４に示す各工程を行う。まず、プラズマ照射工程ＳＴ１において、反射防止膜８の表面に対してプラズマＰを照射し、反射防止膜８に親水化処理を行う。反射防止膜８は、成膜直後は、親水性が高いが、時間と経過とともに親水性が低下するため、プラズマＰを照射することによって、反射防止膜８の表面の親水性を高める。プラズマＰは、酸素プラズマあるいは窒素プラズマである。本実施形態では、プラズマＰの照射によって、反射防止膜８の表面の全域の親水性を高める。本実施形態では、プラズマＰを光軸Ｌに沿う方向から照射するため、プラズマＰは、第１側面部１１６に照射されにくく、第１側面部１１６における親水性の上昇を抑制することができる。 In the present embodiment, as shown in FIG. 2, when coating the hydrophilic film 9 on the first lens 11, first, the antireflection film 8 is formed on the first lens surface 11a of the first lens 11, and then the hydrophilic film 9 is formed. Each step shown in is performed. First, in the plasma irradiation step ST1, the surface of the antireflection film 8 is irradiated with plasma P, and the antireflection film 8 is hydrophilized. The antireflection film 8 has high hydrophilicity immediately after film formation, but since the hydrophilicity decreases with time, the hydrophilicity of the surface of the antireflection film 8 is increased by irradiating the plasma P. The plasma P is oxygen plasma or nitrogen plasma. In the present embodiment, the irradiation of the plasma P increases the hydrophilicity of the entire surface of the antireflection film 8. In the present embodiment, since the plasma P is irradiated from the direction along the optical axis L, the plasma P is less likely to be irradiated on the first side surface portion 116, and the increase in hydrophilicity of the first side surface portion 116 can be suppressed.
　本実施形態では、プラズマＰを帯状に発生させ、プラズマＰと第１レンズ１１とを相対移動させ、矢印Ｄで示すように、第１レンズ面１１ａにプラズマＰを走査する。従って、プラズマＰの走査速度と走査回数とを乗じた値がプラズマＰの照射量であり、プラズマＰの照射量によって、反射防止膜８の表面の親水性は、図５に示すように、変化する。 In the present embodiment, the plasma P is generated in a band shape, the plasma P and the first lens 11 are relatively moved, and the first lens surface 11a is scanned with the plasma P as indicated by an arrow D. Therefore, a value obtained by multiplying the scanning speed of the plasma P and the number of scans is the irradiation amount of the plasma P, and the hydrophilicity of the surface of the antireflection film 8 changes depending on the irradiation amount of the plasma P as shown in FIG. To do.
　図５には、走査速度を２００ｍｍ／ｓに設定し、走査回数を変化させた際の水と反射防止膜８の表面との接触角を実線Ｐ１で示してある。また、図５には、走査速度を６０ｍｍ／ｓに設定した場合の水と反射防止膜８の表面との接触角を実線Ｐ２で示してある。 In FIG. 5, a solid line P1 shows a contact angle between water and the surface of the antireflection film 8 when the scanning speed is set to 200 mm / s and the number of times of scanning is changed. Further, in FIG. 5, the contact angle between water and the surface of the antireflection film 8 when the scanning speed is set to 60 mm / s is shown by a solid line P2.
　図５から分かるように、走査速度を２００ｍｍ／ｓに設定した場合、走査回数が増えるに伴い、接触角が低下し、走査回数を４回とすれば、接触角が目標の２０°以下となる。これに対して、走査速度を６０ｍｍ／ｓに設定した場合、走査回数が１回で接触角が目標の２０°以下となる。 As can be seen from FIG. 5, when the scanning speed is set to 200 mm / s, the contact angle decreases as the number of times of scanning increases, and if the number of times of scanning is 4, the contact angle becomes 20 ° or less of the target. .. On the other hand, when the scanning speed is set to 60 mm / s, the number of times of scanning is 1 and the contact angle is 20 ° or less which is the target.
　次に、搬送工程ＳＴ２では、第１レンズ１１をチャッキングヘッド２００によって第２レンズ面１１ｂの側から保持し、第１レンズ面１１ａを下向きにして、親水膜９を形成するための処理液９０が貯留された処理槽１００の上方位置に搬送する。処理液９０は、水系、アルコール系、水－アルコ－ル系である。本実施形態において、処理液９０は水系である。 Next, in the transporting step ST2, the treatment liquid 90 for forming the hydrophilic film 9 with the first lens 11 held by the chucking head 200 from the second lens surface 11b side and the first lens surface 11a facing downward. Are transported to a position above the processing tank 100 in which The treatment liquid 90 is water-based, alcohol-based, or water-alcohol-based. In the present embodiment, the treatment liquid 90 is aqueous.
　次に、浸漬工程ＳＴ３では、処理槽１００とチャッキングヘッド２００とを上下方向に相対移動させて、第１レンズ１１の第１レンズ面１１ａ側を処理液９０に浸漬させる。その際、図６に示すように、第１レンズ１１を第１レンズ面１１ａの有効領域１１ｅより径方向外側、かつ、第１側面部１１６より径方向内側まで、第１レンズ１１を処理液９０に浸漬する。つまり、第１レンズ１１は、第１レンズ面１１ａの有効領域１１ｅ以上を処理液９０に浸漬させるが、第１側面部１１６は処理液９０に浸漬させない。なお、第１レンズ面１１ａの有効領域１１ｅとは、第１レンズ面１１ａのレンズとしての有効径である。 Next, in the immersion step ST3, the processing bath 100 and the chucking head 200 are moved relative to each other in the vertical direction to immerse the first lens surface 11a side of the first lens 11 in the processing liquid 90. At that time, as shown in FIG. 6, the first lens 11 is treated with the treatment liquid 90 until the first lens 11 is radially outside the effective area 11e of the first lens surface 11a and radially inward of the first side surface portion 116. Soak in. That is, in the first lens 11, the effective area 11e or more of the first lens surface 11a is immersed in the treatment liquid 90, but the first side surface portion 116 is not immersed in the treatment liquid 90. The effective area 11e of the first lens surface 11a is the effective diameter of the first lens surface 11a as a lens.
　次に、引き上げ工程ＳＴ４では、処理槽１００とチャッキングヘッド２００とを上下方向に相対移動させて、第１レンズ１１の第１レンズ面１１ａを処理液９０から引き上げる。 Next, in the pulling-up step ST4, the processing bath 100 and the chucking head 200 are moved relative to each other in the vertical direction to pull up the first lens surface 11a of the first lens 11 from the processing liquid 90.
　次に、脱液工程ＳＴ５では、第１レンズ面１１ａを下向きにした状態で、第１レンズ面１１ａを通って光軸Ｌに沿って延在する軸線Ｌ０周りに第１レンズ１１を回転させ、余剰な処理液９５を遠心力によって第１レンズ面１１ａから離脱させる。本実施形態では、第１レンズ１１の光軸Ｌ（第１レンズ１１の中心光軸）周りに第１レンズ１１を回転させる。 Next, in the liquid removing step ST5, with the first lens surface 11a facing downward, the first lens 11 is rotated around the axis L0 extending along the optical axis L through the first lens surface 11a, The surplus processing liquid 95 is separated from the first lens surface 11a by the centrifugal force. In the present embodiment, the first lens 11 is rotated around the optical axis L of the first lens 11 (the central optical axis of the first lens 11).
　次に、乾燥工程では、第１レンズ面１１ａに塗布された処理液９０を乾燥させて親水膜９とする。 Next, in the drying step, the treatment liquid 90 applied to the first lens surface 11a is dried to form the hydrophilic film 9.
　このようなコーティング方法によれば、浸漬工程ＳＴ３における第１レンズ面１１ａの処理液９０への浸漬深さ、および脱液工程ＳＴ５における第１レンズ１１の回転速度等によって、第１レンズ１１に対して処理液９０が塗布される範囲や処理液９０の厚さを制御することができるので、第１レンズ面１１ａを親水膜９によって適正にコーティングすることができる。 According to such a coating method, with respect to the first lens 11 depending on the immersion depth of the first lens surface 11a in the treatment liquid 90 in the immersion step ST3, the rotation speed of the first lens 11 in the liquid removal step ST5, and the like. Since the range in which the treatment liquid 90 is applied and the thickness of the treatment liquid 90 can be controlled, the first lens surface 11a can be appropriately coated with the hydrophilic film 9.
　より具体的には、第１レンズ１１の第１レンズ面１１ａ側を処理液９０に浸漬する際、第１レンズ１１を第１レンズ面１１ａの有効領域１１ｅより径方向外側、かつ、第１側面部１１６より径方向内側まで、第１レンズ１１を処理液９０に浸漬する。このため、有効領域１１ｅを含む第１レンズ面１１ａの全域に処理液９０を塗布することができるので、有効領域１１ｅを含む第１レンズ面１１ａの全域に親水膜９をコーティングすることができる。また、処理液９０は、第１側面部１１６のうち、第１レンズ面１１ａ側の端部（物体側端部１１６ａ）を乗り越えることはあっても、第１レンズ面１１ａの第１側面部１１６の全域までは塗布されない。従って、第１側面部１１６のうち、カシメ部７５が被さる部分や、第２側面部１１７には処理液９０が塗布されない。従って、第１側面部１１６のうち、カシメ部７５が被さる部分や、第２側面部１１７に親水膜９がコーティングされることを抑制することができる。 More specifically, when the first lens surface 11a side of the first lens 11 is immersed in the treatment liquid 90, the first lens 11 is radially outside the effective area 11e of the first lens surface 11a, and the first side surface. The first lens 11 is immersed in the treatment liquid 90 to the inside of the portion 116 in the radial direction. Therefore, since the treatment liquid 90 can be applied to the entire area of the first lens surface 11a including the effective area 11e, the hydrophilic film 9 can be applied to the entire area of the first lens surface 11a including the effective area 11e. Further, although the treatment liquid 90 may go over the end portion on the first lens surface 11a side (object side end portion 116a) of the first side surface portion 116, the first side surface portion 116 of the first lens surface 11a. Is not applied to the entire area. Therefore, the treatment liquid 90 is not applied to the portion of the first side surface portion 116 covered by the caulking portion 75 or the second side surface portion 117. Therefore, it is possible to prevent the hydrophilic film 9 from being coated on the portion of the first side surface portion 116 covered by the caulking portion 75 and the second side surface portion 117.
　これに対して、第１レンズ面１１ａの側面部１１０の全域まで処理液９０を浸漬すると、脱液工程ＳＴ５において、第１レンズ１１を回転させて余剰な処理液９５を遠心力によって離脱させても、親水膜９は、第１レンズ面１１ａの膜厚よりも側面部１１０の膜厚の方が分厚く形成される。例えば、親水膜９は、側面部１１０では第１レンズ面１１ａよりも２倍から５倍の膜厚で形成される。また、第１側面部１１６と連結面１１８と間の角部に処理液が残りやすいため、外周側端部１１９に親水膜９が分厚く形成されてしまう。その結果、ホルダ７の第１レンズ保持用筒部７０に第１レンズ１１を挿入しにくくなるという事態や、挿入できなくなるという事態が発生してしまう。また、ホルダ７の第１レンズ保持用筒部７０に第１レンズ１１を挿入できても、第１レンズ１１の外周側端部に対してカシメ部７５が重なる寸法が小さくなるため、カシメ不足になる虞がある。 On the other hand, when the treatment liquid 90 is immersed in the entire side surface 110 of the first lens surface 11a, in the liquid removing step ST5, the first lens 11 is rotated to remove the excess treatment liquid 95 by centrifugal force. Further, the hydrophilic film 9 is formed such that the film thickness of the side surface portion 110 is thicker than the film thickness of the first lens surface 11a. For example, the hydrophilic film 9 is formed on the side surface portion 110 to have a film thickness that is 2 to 5 times that of the first lens surface 11a. Further, since the treatment liquid is likely to remain at the corner between the first side surface portion 116 and the connecting surface 118, the hydrophilic film 9 is thickly formed at the outer peripheral side end portion 119. As a result, a situation occurs in which it becomes difficult to insert the first lens 11 into the first lens holding tubular portion 70 of the holder 7 or a situation in which the first lens 11 cannot be inserted. Further, even if the first lens 11 can be inserted into the first lens holding tubular portion 70 of the holder 7, the size in which the caulking portion 75 overlaps the outer peripheral side end portion of the first lens 11 becomes small, so that the caulking is insufficient. There is a risk of becoming.
　また、本実施形態では、脱液工程ＳＴ５において、第１レンズ１１の頂部を通る光軸Ｌ周りに第１レンズ１１を回転させるので、処理液９０が塗布される範囲や処理液９０の厚さを光軸Ｌ周りに制御することができる。 Further, in the present embodiment, in the liquid removing step ST5, since the first lens 11 is rotated around the optical axis L passing through the top of the first lens 11, the range in which the processing liquid 90 is applied and the thickness of the processing liquid 90 are applied. Can be controlled around the optical axis L.
　また、親水膜９をコーティングする前に第１レンズ面１１ａ側から第１レンズ１１にプラズマ処理を行うため、親水膜９をコーティングする際の下地面となる反射防止膜８の親水性を高めることができる。従って、処理液９０を適正に塗布することができるので、第１レンズ面１１ａを親水膜９によって適正にコーティングすることができる。また、第１レンズ面１１ａは、曲率半径が１０ｍｍ以上、かつ、１５ｍｍ以下の凸状の球面であるため、第１レンズ面１１ａにプラズマ処理を行う場合でも、第１レンズ面１１ａの全域にプラズマ処理を行いやすい。 Further, since plasma treatment is performed on the first lens 11 from the first lens surface 11a side before coating the hydrophilic film 9, it is necessary to enhance hydrophilicity of the antireflection film 8 serving as a ground surface when coating the hydrophilic film 9. You can Therefore, the treatment liquid 90 can be properly applied, and thus the first lens surface 11 a can be properly coated with the hydrophilic film 9. Further, since the first lens surface 11a is a convex spherical surface having a radius of curvature of 10 mm or more and 15 mm or less, even when plasma processing is performed on the first lens surface 11a, plasma is applied to the entire area of the first lens surface 11a. Easy to process.
［他の実施形態］
　上記実施形態では、第１レンズ面１１ａに反射防止膜８が形成されているため、反射防止膜８の物体側Ｌａの面に親水膜９を形成したが、第１レンズ面１１ａに反射防止膜８が形成されておらず、第１レンズ面１１ａに親水膜９を直接、コーティングする場合に本発明を適用してもよい。 [Other Embodiments]
In the above embodiment, since the antireflection film 8 is formed on the first lens surface 11a, the hydrophilic film 9 is formed on the object-side La surface of the antireflection film 8. However, the antireflection film 8 is formed on the first lens surface 11a. The present invention may be applied to the case where the hydrophilic film 9 is directly coated on the first lens surface 11a without forming the film 8.
　また、上記実施形態では、５群６枚のレンズ構成を有するレンズユニット１に本発明を適用したが、３群３枚、４群４枚、５群６枚、あるいは６群７枚のレンズ構成等を有するレンズユニット１に本発明を適用してもよく、レンズ構成やレンズ枚数に限定されない。 Further, in the above-described embodiment, the present invention is applied to the lens unit 1 having a lens configuration of 5 groups and 6 elements, but a lens configuration of 3 elements in 3 groups, 4 elements in 4 groups, 5 elements in 6 groups, or 7 elements in 6 groups The present invention may be applied to the lens unit 1 having, for example, and is not limited to the lens configuration or the number of lenses.
１…レンズユニット、７…ホルダ、８…反射防止膜、９…親水膜、１０…広角レンズ、１１…第１レンズ、１１ａ…第１レンズ面、１１ｂ…第２レンズ面、１１ｃ…フランジ部、１１ｅ…有効領域、１２…第２レンズ、１３…第３レンズ、１４…第４レンズ、１５…第５レンズ、１６…第６レンズ、７０…第１レンズ保持用筒部、７５…カシメ部、９０、９５…処理液、１００…処理槽、１１０…側面部、１１１…第１面、１１２…第２面、１１５…最外周面、１１６…第１側面部、１１７…第２側面部、１１８…連結面、１１９…外周側端部、２００…チャッキングヘッド、Ｌ…光軸、Ｌ０…軸線、Ｐ…プラズマ、Ｌａ…物体側、Ｌｂ…像側、ＳＴ１…プラズマ照射工程、ＳＴ２…搬送工程、ＳＴ３…浸漬工程、ＳＴ４…引き上げ工程、ＳＴ５…脱液工程 DESCRIPTION OF SYMBOLS 1 ... Lens unit, 7 ... Holder, 8 ... Antireflection film, 9 ... Hydrophilic film, 10 ... Wide-angle lens, 11 ... 1st lens, 11a ... 1st lens surface, 11b ... 2nd lens surface, 11c ... Flange part, 11e ... Effective area, 12 ... 2nd lens, 13 ... 3rd lens, 14 ... 4th lens, 15 ... 5th lens, 16 ... 6th lens, 70 ... 1st lens holding | maintenance cylinder part, 75 ... Caulking part, 90, 95 ... Treatment liquid, 100 ... Treatment tank, 110 ... Side surface portion, 111 ... First surface, 112 ... Second surface, 115 ... Outermost peripheral surface, 116 ... First side surface portion, 117 ... Second side surface portion, 118 ... Connection surface 119 ... Outer peripheral side end portion, 200 ... Chucking head, L ... Optical axis, L0 ... Axis line, P ... Plasma, La ... Object side, Lb ... Image side, ST1 ... Plasma irradiation step, ST2 ... Conveying step , ST3 ... soaking step, ST4 ... pulling up step, S 5 ... liquid removal process

Claims (9)

  1. 　複数のレンズと、
    　前記複数のレンズを内側に保持する筒状のホルダと、
    　を有し、
    　前記ホルダは、前記複数のレンズのうち、最も物体側の第１レンズの最も径方向外側の最外周面に径方向外側から重なる第１レンズ保持用筒部と、前記第１レンズ保持用筒部の物体側端部で前記第１レンズの外周側で物体側に向く外周側端部に物体側から被さったカシメ部と、を有し、
    　前記第１レンズには、物体側の第１レンズ面を含み、像側の第２レンズ面、および前記最外周面を除く領域に親水膜がコーティングされていることを特徴とするレンズユニット。     Multiple lenses,
    A cylindrical holder that holds the plurality of lenses inside,
    Have
    The holder includes a first lens-holding tubular portion that overlaps the radially outermost outermost peripheral surface of the first lens closest to the object from the radially outer side of the plurality of lenses, and the first lens-holding tubular portion. An object side end of the first lens on the outer peripheral side facing the object side on the outer peripheral side end, and a caulking portion covered from the object side,
    The lens unit, wherein the first lens includes a first lens surface on the object side, and a hydrophilic film is coated on a region other than the second lens surface on the image side and the outermost peripheral surface.
  2. 　請求項１に記載のレンズユニットにおいて、
    　前記第１レンズは、前記第１レンズ面と前記第２レンズ面とを繋ぐフランジ部を備え、
    　前記最外周面は、前記フランジ部の最も径方向外側に位置する側面部であることを特徴とするレンズユニット。     The lens unit according to claim 1,
    The first lens includes a flange portion that connects the first lens surface and the second lens surface,
    The lens unit, wherein the outermost peripheral surface is a side surface portion located on the outermost radial direction of the flange portion.
  3. 　請求項２に記載のレンズユニットにおいて、
    　前記フランジ部は、前記第１レンズ面の外縁から像側に延在する第１側面部と、前記第１側面部より像側、かつ、前記第１側面部より径方向外側で物体側から像側に向けて延在する第２側面部と、前記第１側面部の像側端部と前記第２側面部の物体側端部とを繋ぐ連結面と、を有し、
    　前記連結面が前記外周側端部であり、
    　前記第２側面部が前記最外周面であることを特徴とするレンズユニット。     The lens unit according to claim 2,
    The flange portion includes a first side surface portion extending from the outer edge of the first lens surface toward the image side, an image side from the first side surface portion, and an image from the object side radially outside the first side surface portion. A second side surface portion that extends toward the side, a connection surface that connects the image side end portion of the first side surface portion and the object side end portion of the second side surface portion,
    The connecting surface is the outer peripheral side end,
    The lens unit, wherein the second side surface portion is the outermost peripheral surface.
  4. 　請求項３に記載のレンズユニットにおいて、
    　前記親水膜は、前記第１レンズ面の全域、および前記第１側面部の一部に設けられていることを特徴とするレンズユニット。     The lens unit according to claim 3,
    The lens unit, wherein the hydrophilic film is provided on the entire area of the first lens surface and a part of the first side surface portion.
  5. 　請求項４に記載のレンズユニットにおいて、
    　前記カシメ部は、前記第１側面部を部分的に覆い、
    　前記親水膜は、前記第１側面部において前記カシメ部から露出している部分に設けられていることを特徴とするレンズユニット。     The lens unit according to claim 4,
    The caulking portion partially covers the first side surface portion,
    The said hydrophilic film is provided in the part exposed from the said crimping part in the said 1st side surface part, The lens unit characterized by the above-mentioned.
  6. 　請求項１から５までの何れか一項に記載のレンズユニットにおいて、
    　前記第１レンズ面には反射防止膜が設けられ、
    　前記反射防止膜の物体側の面に前記親水膜が設けられていることを特徴とするレンズユニット。     The lens unit according to any one of claims 1 to 5,
    An antireflection film is provided on the first lens surface,
    A lens unit, wherein the hydrophilic film is provided on the object-side surface of the antireflection film.
  7. 　請求項１から６までの何れか一項に記載のレンズユニットにおいて、
    　前記第１レンズ面は、曲率半径が１０ｍｍ以上、かつ、１５ｍｍ以下の凸状の球面であることを特徴とするレンズユニット。     The lens unit according to any one of claims 1 to 6,
    The lens unit, wherein the first lens surface is a convex spherical surface having a radius of curvature of 10 mm or more and 15 mm or less.
  8. 　請求項１から７までの何れか一項に記載のレンズユニットにおいて、
    　前記第１レンズは、ガラスレンズであることを特徴とするレンズユニット。     The lens unit according to any one of claims 1 to 7,
    The lens unit, wherein the first lens is a glass lens.
  9. 　請求項１から８までの何れか一項に記載のレンズユニットにおいて、
    　前記親水膜は、酸化シリコンの粒子、および酸化チタン粒子を含むことを特徴とするレンズユニット。     The lens unit according to any one of claims 1 to 8,
    The hydrophilic unit contains silicon oxide particles and titanium oxide particles.
PCT/JP2019/040157 2018-10-31 2019-10-11 Lens unit WO2020090416A1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
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JP2009265473A (en) * 2008-04-28 2009-11-12 Konica Minolta Opto Inc Lens, imaging lens and imaging apparatus
JP2012237941A (en) * 2011-05-13 2012-12-06 Asahi Glass Co Ltd Optical component and optical device
WO2014188943A1 (en) * 2013-05-20 2014-11-27 日本電産サンキョー株式会社 Lens unit and optical unit
JP2015035722A (en) * 2013-08-09 2015-02-19 市光工業株式会社 On-vehicle camera
JP2017068070A (en) * 2015-09-30 2017-04-06 日本電産コパル株式会社 Lens unit, imaging unit, optical device, and electronic device
JP2018180264A (en) * 2017-04-12 2018-11-15 マクセル株式会社 Wide-angle lens unit and vehicle-mounted camera

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009265473A (en) * 2008-04-28 2009-11-12 Konica Minolta Opto Inc Lens, imaging lens and imaging apparatus
JP2012237941A (en) * 2011-05-13 2012-12-06 Asahi Glass Co Ltd Optical component and optical device
WO2014188943A1 (en) * 2013-05-20 2014-11-27 日本電産サンキョー株式会社 Lens unit and optical unit
JP2015035722A (en) * 2013-08-09 2015-02-19 市光工業株式会社 On-vehicle camera
JP2017068070A (en) * 2015-09-30 2017-04-06 日本電産コパル株式会社 Lens unit, imaging unit, optical device, and electronic device
JP2018180264A (en) * 2017-04-12 2018-11-15 マクセル株式会社 Wide-angle lens unit and vehicle-mounted camera

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