WO2009157273A1 - Imaging optical system, and imaging lens manufacturing method - Google Patents

Imaging optical system, and imaging lens manufacturing method Download PDF

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Publication number
WO2009157273A1
WO2009157273A1 PCT/JP2009/059962 JP2009059962W WO2009157273A1 WO 2009157273 A1 WO2009157273 A1 WO 2009157273A1 JP 2009059962 W JP2009059962 W JP 2009059962W WO 2009157273 A1 WO2009157273 A1 WO 2009157273A1
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WIPO (PCT)
Prior art keywords
glass substrate
ir cut
cut coating
optical system
surface
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PCT/JP2009/059962
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French (fr)
Japanese (ja)
Inventor
節夫 徳弘
Original Assignee
コニカミノルタオプト株式会社
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Priority to JP2008-165424 priority Critical
Priority to JP2008165424 priority
Application filed by コニカミノルタオプト株式会社 filed Critical コニカミノルタオプト株式会社
Publication of WO2009157273A1 publication Critical patent/WO2009157273A1/en

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/001Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0055Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/006Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/20Filters
    • G02B5/208Filters for use with infra-red or ultraviolet radiation, e.g. for separating visible light from infra-red and/or ultraviolet radiation
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/20Filters
    • G02B5/28Interference filters
    • G02B5/281Interference filters designed for the infra-red light

Abstract

Provided is an imaging optical system capable of suppressing the warpage and bend of a glass substrate.  Also provided is an imaging lens manufacturing method.  The imaging optical system includes an imaging lens having a lens portion made of a hardening resin on the glass substrate.  The imaging optical system is characterized by including at least one group of imaging lenses and by having IR cut coats formed individually on both the front and back surfaces of the glass substrate.

Description

Manufacturing method of the imaging optical system and the imaging lens

The present invention relates to a method for producing an imaging optical system and the imaging lens.

Conventionally, in the field of manufacturing an optical lens, to the wafer-shaped glass substrate provided with a plurality of lens portions made of the cured resin (to prepare a so-called "wafer lens"), cutting the glass substrate of the wafer-shaped for each lens unit · fragmentation to attempt to use one one as an imaging lens have been made. In recent years, as a technique of applying this (see Patent Document 1) IR (Infrared Rays, infrared) example of forming a cut coating is disclosed to the glass substrate of the imaging lens, of the front and back surfaces of the glass substrate on at least one side it has been described to the effect that IR cut coating is formed.

U.S. Patent Application Publication 2007/0024958 discloses

However, according to the technique of Patent Document 1, although to form an IR cut coating on both sides from the description of the formed an IR cut coating on at least one surface is suggested, the substrate to which the present invention is a challenge references to warpage is not deliberately than that does not mention with regard to address them, there is a possibility that bend warp glass substrate by the stress of the film.

Therefore, solving problems of the present invention is to provide a manufacturing method of an imaging optical system and an imaging lens capable of suppressing bending warpage of the glass substrate.

Above object of the present invention is solved by the following means.

1. An imaging optical system having an imaging lens for forming a lens portion made of a curable resin on a glass substrate,
Having at least one or more group of the imaging lens,
An imaging optical system, characterized in that the IR cut coating is formed respectively to front and back surfaces of the glass substrate.

2. In the imaging optical system according to the 1,
Wherein a total thickness r1 of the IR cut coating formed on one surface of the glass substrate, the total film thickness ratio r between the total thickness r2 of the other IR cut coating formed on the surface of the glass substrate, wherein It satisfies the condition imaging optical system characterized by (1).

0.9 ≦ r (= r1 / r2) ≦ 1.1 ... (1)
3. In the imaging optical system according to the 1 or 2,
The IR cut coating is a low refractive index layer A composed of a low refractive index material, an alternate multilayer film alternately stacked and a high refractive index layer B composed of a high refractive index material,
Wherein the total thickness of the low refractive index layer A1 of the one surface formed IR cut coating of the glass substrate r (A1), the low refractive index layer of the other IR cut coating formed on the surface of the glass substrate A2 total film thickness ratio r (a) between the total thickness r (A2) of, satisfies the condition of formula (2), and the high refractive index layer of the IR cut coating formed on one surface of the glass substrate B1 total film thickness r (B1) of the total film thickness ratio r of the total film thickness r (B2) of the high refractive index of the other IR cut coating formed on the surface of the glass substrate layer B2 (B) is an imaging optical system, wherein a satisfies the equation (3).

0.9 ≦ r (A) (= r (A1) / r (A2)) ≦ 1.1 ... (2)
0.9 ≦ r (B) (= r (B1) / r (B2)) ≦ 1.1 ... (3)
4. In the imaging optical system according to any of the foregoing 1 to 3,
The glass substrate of the imaging lens, the peripheral portion made of a curable resin formed in the periphery of the lens portion is formed, the thickness of the peripheral portion which is formed on one surface of the glass substrate and t1 the thickness of the formed on one surface of the glass substrate the periphery and t2,
The total thickness of the IR cut coating formed on one surface of the glass substrate and r1, when the total thickness of the IR cut coating formed on the other surface of the glass substrate was set to r2,
Equation (4) or the imaging optical system, wherein the condition is satisfied that the formula (5).

t1> t2, r1 <r2 ... (4)
t1 <t2, r1> r2 ... (5)
5. In the imaging optical system according to any one of the 1-4,
The imaging lens having two or more groups,
Wherein in the imaging lens, the imaging optical system, wherein the imaging lens is not formed the IR cut coating to the glass substrate is placed on the image side.

6. In the imaging optical system according to any one of the 1-5,
The curable resin is a photocurable resin,
The IR cut coating is, the imaging optical system characterized by having a transmissivity of 50% or more for light having a wavelength of 365 nm.

7. In the imaging optical system according to the 6,
Image pickup optical system wherein the light curable resin is characterized in that an acrylic resin or epoxy resin.

8. Forming an IR cut coating to both surfaces of the glass substrate,
And performing a silane coupling treatment on the IR cut coating,
Forming a lens portion made multiple curable resin on the IR cut coating after the silane coupling treatment,
And cutting the glass substrate for each of the lens unit,
Method for manufacturing an imaging lens, characterized in that it comprises a.

By the means of the present invention, it is possible to provide a manufacturing method of an imaging optical system and an imaging lens capable of suppressing bending warpage of the glass substrate.

That is, according to the present invention, since the IR cut coating to both surfaces of the glass substrate is formed, warpage of the glass substrate during IR cut coating film formation on the one surface of the glass substrate, to the other side offset by warping of the glass substrate during IR cut coating film formation, it is possible to suppress the bending warpage of the glass substrate.

Is an exploded perspective view showing a schematic configuration of an imaging unit according to a preferred embodiment of the present invention. It is a sectional view showing a schematic configuration of an imaging lens according to a preferred embodiment of the present invention. Schematic manufacturing method of an image pickup unit according to a preferred embodiment of the present invention is a view for explaining the. A diagram for explaining a schematic method of manufacturing the image pickup unit according to a preferred embodiment of the present invention, a subsequent figures of FIG. A modification of the imaging optical system according to a preferred embodiment of the present invention is a schematic sectional view showing. It illustrates a schematic relationship between the wavelength and transmittance of the coated seed type I. It illustrates a schematic relationship between the wavelength and transmittance of the coated seed type II. It illustrates a schematic relationship between the wavelength and transmittance of the coated seed type III. It illustrates a schematic relationship between the wavelength and transmittance of the coated seed type IV. It illustrates a schematic relationship between the wavelength and transmittance of the coated seed type V. It illustrates a schematic relationship between the wavelength and transmittance of the coated seed type VI.

The imaging optical system of the present invention is an imaging optical system having an imaging lens for forming a lens portion made of a curable resin on a glass substrate having at least one or more group of the imaging lens, the glass substrate IR cut coating to both sides is characterized in that it is formed, respectively. This feature is technical feature common to the invention according to claim 1, claim 8.

Hereinafter, a detailed description about the preferred embodiments of the present invention with reference to the drawings.

As shown in FIG. 1, the imaging unit 1 according to a preferred embodiment of the present invention is primarily the lens unit 2 is composed of a sensor device 4 and the casing 5, the lens unit 2 and the sensor device 4 is covered with a casing 5 has a configuration was.

Casing 5 is composed of a cylindrical cylinder portion 51 and the rectangular parallelepiped base portion 53. Cylindrical portion 51 and the base portion 53 are integrally molded, cylindrical portion 51 is erected on the base portion 53. The lens unit 2 is disposed inside the cylindrical portion 51. The top plate portion of the cylindrical portion 51 is formed with a circular light transmission hole 51a. Sensor device 4 inside (bottom) of the base portion 53 is disposed. The sensor device 4 such as a CCD or a CMOS is used.

As the lens unit 2 shown in FIG. 1 enlarged view mainly the diaphragm 21 is constituted by an imaging lens 23 and the spacer 25. These members are overlapped with each other in a state where the imaging lens 23 is arranged between the diaphragm 21 and the spacer 25. Central portion of the imaging lens 23 has the shape of a respective convex shape in both sides, this site is basically adapted to exert an optical function. Diaphragm 21 is a member for adjusting the amount of light incident on the imaging lens 23, a circular opening portion 21a is formed in the center portion. The spacer 25 is a member for adjusting position of the lens unit 2 in the cylindrical portion 51 of the casing 5 (height position), the central portion also circular opening 25a (see FIG. 1 top) is formed ing.

As shown in FIG. 2, the imaging lens 23 has a glass substrate 100. The surface 102 of the glass substrate 100 is formed IR cut coating 110, IR cut coating 120 on the back surface 104 of the glass substrate 100 are formed. IR cut coating 110, 120 is a film for shielding infrared rays, and has a transmittance of 50% or more with respect to the wavelength 365nm of light. Specifically, the IR cut coating 110 low refractive index layer composed of a low refractive index material is A1, A2, and a high refractive index layer B1, B2, which is composed of high refractive index material and alternately stacked an alternating multi-layer film. In IR cut coating 110, 120 preferably has a low refractive index layer A1, A2 are direct contact to the glass substrate 100.

The low refractive index material constituting low refractive index layer A1, A2, etc. SiO 2 is used. On the other hand, as the high-refractive index material constituting the high refractive index layer B1, B2 TiO 2, Ta 2 O 5, Nb 2 O 3, ZrO 2 and the like are used. It IR cut coating 110, 120 may be composed of a low refractive index layer A1, A2 are different from each other material, high refractive index layer B1, B2 may also be configured mutually different materials. Further, IR cut coating 110 and 120 is constituted by usually 10 to 40 layers or so, to the number of layers may be the same as each other or may be different.

In the imaging lens 23, preferably the total thickness r1 of the IR cut coating 110 formed on the surface 102 of the glass substrate 100, the total thickness r2 of the IR cut coating 120 formed on the rear surface 104 of the glass substrate 100 the total film thickness ratio r, satisfies the condition of formula (1).

0.9 ≦ r (= r1 / r2) ≦ 1.1 ... (1)
Further, in the image pickup lens 23, preferably formed in a total thickness and r (A1), the back surface of the glass substrate 104 of the low refractive index layer A1 of the IR cut coating 110 formed on the surface 102 of the glass substrate 100 IR total film thickness ratio r between the total thickness of the low refractive index layer A2 of cut coating 120 r (A2) (a) is, satisfies the condition of formula (2), and, formed on the surface 102 of the glass substrate 100 the total thickness r of the high refractive index layer B1 of the IR cut coating 110 (B1), the total thickness of the high refractive index layer B2 of the IR cut coating 120 formed on the rear surface 104 of the glass substrate 100 r (B2) and the total film thickness ratio r (B) is, satisfies the condition of formula (3).

0.9 ≦ r (A) (= r (A1) / r (A2)) ≦ 1.1 ... (2)
0.9 ≦ r (B) (= r (B1) / r (B2)) ≦ 1.1 ... (3)
Further, as shown in FIG. 2, on the IR cut coating 110 resin portion 130 is formed. Resin portion 130 is composed of a curable resin 130A. The resin portion 130 has a peripheral portion 134 covering the peripheral lens portion 132 exhibited a convex lens portion 132 and the peripheral portion 134 is integrally molded. Similarly, the resin portion 140 to the lower IR cut coating 120 is formed. Resin portion 140 is composed of a curable resin 140A. The resin portion 140 has a peripheral portion 144 covering the peripheral lens portion 142 exhibited a convex lens portion 142 and the peripheral portion 144 is integrally molded.

In the imaging lens 23, when the thickness of the peripheral portion 134 formed on the surface 102 of the glass substrate 100 and t1, the thickness of the peripheral portion 144 formed on the rear surface 104 of the glass substrate 100 and t2, IR in relation to the total film thickness r2 of the total film thickness r1 and IR cut coating 120 of cut coating 110, which satisfies the condition of formula (4) or (5).

t1> t2, r1 <r2 ... (4)
t1 <t2, r1> r2 ... (5)
Of the surface 102 and back surface 104 of the glass substrate 100 may be provided either one of the resin portion on the side 130 and 140 (the lens unit 132, 142). In this case, the lens portion is provided only on one side of the glass substrate 100, the lens unit is not provided than IR cut coating of the lens portion is provided a side (e.g., IR cut coating 110) side of the IR cut coating ( for example, by increasing the thickness of the IR cut coating 120) to suppress the deviation of the imaging lens 23 overall stress, it is possible to further suppress warpage.

Curable resin 130A constituting the resin portion 130 and 140, as the 140A is available photocurable resin, preferably acrylic resin or an allyl ester resin, and epoxy resin can be used. In the following is described the available resins.
(1) can be used an acrylic resin polymer used in the reaction (meth) acrylate is not particularly limited, a general production method produced the following (meth) acrylate. Ester (meth) acrylate, urethane (meth) acrylate, epoxy (meth) acrylate, ether (meth) acrylates, alkyl (meth) acrylate, alkylene (meth) acrylate, having an aromatic ring (meth) acrylate, an alicyclic structure a (meth) acrylate. These may be used alone or in combination.

Especially with an alicyclic structure-containing (meth) acrylate are preferable, it may be a cycloaliphatic structure containing an oxygen atom or a nitrogen atom. For example, cyclohexyl (meth) acrylate, cyclopentyl (meth) acrylate, cycloheptyl (meth) acrylate, bicycloheptyl (meth) acrylate, tricyclo decyl (meth) acrylate, and tricyclodecane dimethanol (meth) acrylate, isobornyl (meth ) acrylate, di (meth) acrylate of hydrogenated bisphenol and the like. The preferred and especially with the adamantane skeleton. For example, 2-alkyl-2-adamantyl (meth) acrylate (see JP 2002-193883), Adamanchiruji (meth) acrylate (JP 57-500785), adamantyl dicarboxylic acid diallyl (JP 60-100537 No. see Japanese), perfluoro adamantyl acrylate (see JP 2004-123687), manufactured by Shin-Nakamura chemical Co., 2-methyl-2-adamantyl methacrylate, 1,3-adamantane diol diacrylate, 1,3,5 adamantanetriol triacrylate, unsaturated carboxylic acid adamantyl ester (refer to Japanese Patent Laid-Open No. 2000-119220), 3,3'-alkoxycarbonyl-1,1 'biadamantane (see JP 2001-253835), 1, 1'-biadamantane compound (US Patent No. 33 Referring 2880 Pat), reference tetra adamantane (JP 2006-169177 publication), 2-alkyl-2-hydroxy adamantane, 2-alkylene adamantane, 1,3-adamantane dicarboxylic acid di -tert- butyl aromatic ring such curable resin having an adamantane skeleton having no (see JP 2001-322950), bis (hydroxyphenyl) adamantanes or bis (glycidyloxyphenyl) adamantane (JP-a-11-35522, JP-a No. 10-130371 see JP), and the like.

It is also possible to contain other reactive monomers. (Meth) if acrylates such as methyl acrylate, methyl methacrylate, n- butyl acrylate, n- butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, isobutyl acrylate, isobutyl methacrylate, tert- butyl acrylate , tert- butyl methacrylate, phenyl acrylate, phenyl methacrylate, benzyl acrylate, benzyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, and the like.

Polyfunctional (meth) acrylates, such as trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, dipentaerythritol penta (meth ) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol tri (meth) acrylate, tripentaerythritol octa (meth) acrylate, tripentaerythritol septa (meth) acrylate, tripentaerythritol hexa (meth) acrylate, Toripenta erythritol penta (meth) acrylate, tripentaerythritol tetra (meth) acrylate, tripentaerythritol DOO (Meth) acrylate.
(2) a resin that is cured by radical polymerization have allyl ester resin allyl group, for example, include the following, but not particularly limited to the following.

Bromine-containing containing no aromatic ring (meth) (see JP 2003-66201) allyl ester, allyl (meth) acrylate (see JP-A-5-286896), an allyl ester resin (JP-A-5-286896 JP , see JP 2003-66201), copolymer compound (see JP 2003-128725 2001-199175 acrylic acid ester and an epoxy group-containing unsaturated compounds) acrylate compound (see JP 2003-147072), acrylic ester compound (see JP 2005-2064), and the like.
(3) As the epoxy resin epoxy resin, as long as it is polymerized and cured by light or heat has the epoxy group is not particularly limited, and may be an acid anhydride or cation generator such as a curing initiator. Epoxy resin has a low cure shrinkage is preferable in that it can be an excellent lens molding precision.

The types of epoxy, novolac phenol epoxy resin, biphenyl type epoxy resins, dicyclopentadiene type epoxy resin. As an example, bisphenol F diglycidyl ether, bisphenol A diglycidyl ether, 2,2'-bis (4-glycidyloxy cyclohexyl) propane, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexane carbonate carboxylate, vinyl cyclohexene dioxide, 2- (3,4-epoxycyclohexyl) -5,5-spiro - (3,4-epoxycyclohexane) -1,3-dioxane, bis (3,4-epoxycyclohexyl) adipate, 1,2 - it can be exemplified cyclopropane dicarboxylic acid bisglycidyl ester.

Hardeners are those, as used in constructing the curable resin material is not particularly limited. Further, in the present invention, a curable resin material, when comparing the transmittance of the optical material after the addition of additives, curing agent it shall not be included in the additive. As the curing agent, it can be preferably used an acid anhydride curing agent and phenol curing agent. Specific examples of the acid anhydride curing agent include phthalic anhydride, maleic anhydride, trimellitic anhydride, pyromellitic anhydride, hexahydrophthalic anhydride, 3-methyl - hexahydrophthalic anhydride, 4-methyl - hexahydrophthalic anhydride acid or 3-methyl, - hexahydrophthalic anhydride and 4-methyl - a mixture of hexahydrophthalic anhydride, tetrahydrophthalic anhydride, nadic acid, and the like methylnadic anhydride. Further, the curing accelerator is contained if necessary. As the curing accelerator, curing is good, colorization, as long as it does not impair the transparency of the thermosetting resin, is not particularly limited, for example, 2-ethyl-4-methylimidazole imidazoles such as (2E4MZ), 3 amine, can be used quaternary ammonium salts, bicyclic amidines such as diazabicycloundecene and derivatives thereof, phosphine, phosphonium salts, and these one or it may be used as a mixture of two or more.

In more imaging units 1, incident on the lens unit 2 through the external light is the light transmission hole 51a, the incident light is adjusted light quantity at the opening 21a of the diaphragm 21, passes through the imaging lens 23, the aperture of the spacer 25 It is emitted from the section 25a. Then, the emitted light has a structure such that incident on the sensor device 4.

Subsequently, (including the method for manufacturing the imaging lens 23.) A method of manufacturing the image pickup unit 1 will be described.

First, prepare the wafer-shaped glass substrate 100, respectively to form the IR cut coating 110, 120 relative to its surface 102 and back surface 104. As a method of forming the IR cut coating 110, using a known vacuum deposition or sputtering, CVD (Chemical Vapour Deposition) method, or the like.

Thereafter, for the purpose of increasing the adhesion between the resin 130 and 140 to IR cut coating 110, it executes a silane coupling treatment to the upper IR cut coating 110. Specifically, a silane coupling agent (manufactured by Dow Corning Toray SZ-6030) was diluted to 0.1 ~ 2.0 wt% in ethanol, to which was added acetic acid to adjust the pH to 3-5. And dried by coating the solution onto the IR cut coating 110. As a result, the surface was strongly chemically bonded silanol bond is formed IR cut coating 110. The surface may adhesiveness between the cured resin (130A, 140A), adhesion between the resin 130 and 140 formed on the IR cut coating 110 and 120 is significantly improved.

Thereafter, as shown in FIG. 3 (a), to fill the curable resin 130A to the cavity 202 of the mold 200. In this case, by placing the upper part curable resin 130A of the die 200 is moved downward while pressing the glass substrate 100 from above, to fill the curable resin 130A into the cavity 202. When filling the curable resin 130A may be filled with a curable resin 130A while vacuuming. If filled with a curable resin 130A while vacuuming, it is possible to prevent the air bubbles are mixed into the curable resin 130A.

Thereafter, a light source 210 arranged above the mold 200 is lit, and light irradiation to cure the curable resin 130A to the curable resin 130A. The light source 210, a high-pressure mercury lamp, a metal halide lamp, a xenon lamp, a halogen lamp, a fluorescent lamp, black light, G light, can use the F lamp, etc., may be a linear light source may be a point-shaped light source good.

When light irradiated from the light source 210, to the light at a time a plurality of linear or point-shaped light source 210 to the curable resin 130A arranged in a lattice shape may be reached, linear or point-like the light source 210 may be sequentially light reaches the curable resin 130A by scanning parallel to the glass substrate 100. In this case, preferably the luminance distribution or illumination (intensity) distribution at the time of light irradiation were measured, the number of irradiation times based on the measurement result, the dose, to control the irradiation time and the like.

Here, as described above, since the IR cut coating 110, 120 has a transmittance of 50% or more for light having a wavelength of 365 nm, the light emitted from the light source 210, an IR cut coating 110, 120 (the glass substrate 100 including.) sufficiently permeable to, IR cut coating 110 does not become factors that impede curing of the curable resin 130A.

Incidentally, in the case consists of the mold 200 is a transparent material (glass, resin, etc.) also turns on the light source 210 disposed below the mold 200, both sides of the glass substrate 100 side and the mold 200 it may be irradiated with light from.

Thereafter, when the curable resin 130A by light irradiation to cure the resin portion 130 on surface 102 of the glass substrate 100 (lens unit 132) is formed. Thereafter, as shown in FIG. 3 (b), releasing the glass substrate 100 from the mold 200. Thereafter, as shown in FIG. 3 (c), it is turned over the glass substrate 100, similarly to the formation of the resin portion 130 to the surface 102 of the glass substrate 100, and placing the curable resin 140A in a mold 200 Glass the substrate 100 is pressed, and light irradiation to the curable resin 140A, is formed on the rear surface 104 of the glass substrate 100 resin section 140 (lens unit 142).

Figure 4 upper lens array 27 is manufactured by the above process.

In FIG. 3, are omitted IR cut coating 110 and 120 for clarity of the content.

Thereafter, as shown in FIG. 4 upper part, in addition to the lens array 27 in which a plurality of lens portions 132 and 142 are formed, a diaphragm array 26 lens unit 132 and the same number of openings 21a are formed, the same number as the lens portion 142 opening 25a is a spacer array 28 formed to prepare for. Aperture array 26 and the spacer array 28 is colored black by mixing carbon curable resin is obtained by molding a resin by injection molding.

Thereafter, the adhesive bonding the diaphragm array 26 and the spacer array 28 relative to the lens array 27, producing a lens unit array 29. Thereafter, 4 middle, and individually diced to produce a plurality of lens units 2 as shown in the lower part, the lens unit array 29 at end mill for each lens unit 132, 142, cylinder each lens unit 2 casing 5 (adhered) built in part 51, the imaging unit 1 is manufactured.

According to the present embodiment, the imaging lens 23, since the surface 102 IR cut coating 110 and 120 relative to the and the back 104 of the glass substrate 100 is formed, one surface of the glass substrate 100 (the surface 102 ) to film stress at the time of forming the IR cut coating 110 can be relaxed by the formation of IR cut coating 120 to the other surface (back surface 104).

In other words, warping of the glass substrate 100 during IR cut coating 110 deposited on one surface of the glass substrate 100 (surface 102), a glass substrate 100 during IR cut coating 120 deposited on the other surface (back surface 104) offset by the warp, it is possible to suppress the bending warpage of the glass substrate 100 as a whole.

In this case, in particular the total thickness of the total film thickness and the low refractive index layer A1, A2 of the formula (1) satisfies the conditions of ~ (3) (IR cut coating 110,120, the high refractive index layer B1, B2, etc. the if almost the same between the surface 102 and back surface 104 of the glass substrate 100), it is possible to more accurately suppress the bending warpage of the glass substrate 100.

Furthermore, according to this embodiment, since the surface 102 IR cut coating 110 and 120 relative to the and the back 104 of the glass substrate 100 is formed, and the infrared region can be shielded by the IR cut coating 110, an IR cut coating 120 over two infrared region of the light shielding can century extracellular region, it is possible to shield infrared rays in a wide infrared region.
[Modification]
In the embodiment shows an example in which the imaging optical system in the imaging lens 23 of the first group, instead of this, the imaging optical in imaging lens of a plurality of groups (or group 2), as shown in FIG. 5 the system may be configured.

The imaging optical system of FIG. 5, and a imaging lens 300, 400 and 500 of the three groups. Imaging lens 300 has a glass substrate 310 on its surface 312 are IR cut coating 110 is formed, IR cut coating 120 is formed on the rear surface 314. On top IR cut coating 110 resin portion 320, on the IR cut coating 120 resin portion 330 is formed.

At approximately the same way, the imaging lens 400 has a glass substrate 410, a resin portion 420 on the surface 412, the resin portion 430 is formed on the rear surface 414. Imaging lens 500 also has a glass substrate 510, the resin part 520 on the surface 512, the resin portion 530 is formed on the rear surface 514. Glass substrate 310, 410, 510 is equivalent to a glass substrate 100 of the imaging lens 23, the resin portion 320,330,420,430,520,530 corresponds to the resin portion 130 and 140 of the imaging lens 23 it is intended.

In the imaging optical system, IR cut coating 110 and 120 are formed (IR cut coating 110, 120 in the imaging lens 300 disposed farthest from the sensor device 4 to the glass substrate 410 of the imaging lens 400 are formed may be.), it is not formed IR cut coating 110 and 120 in the imaging lens 500 disposed closest position facing the sensor device 4. That is, the imaging lens 500 IR cut coating 110, 120 is not formed is arranged on the image plane side.

Here, as described above, IR cut coating 110, 120 are alternately laminated film having a low high refractive index film of about total 10 to 40 layers, the degree of the multilayer film in the course of forming by a vacuum deposition method, such as the number μm approximately dust are mixed as contamination in the film, there can be a problem as the surface foreign matter. This foreign matter is imaged on four faces sensor device as an image, an image foreign substance supposed to have bleeds through becomes problematic, particularly closer to the sensor surface, the size of acceptable foreign matter because the light is condensed severely Become. In contrast, according to this modification, since the form IR cut coating 110, 120 from the sensor surface of the sensor device 4 on the far (the object plane side) glass substrate 310, appearance acceptable standard is relaxed, yield rate as an imaging optical system is improved.

(1) Sample Preparation 3 glass substrates (planar glass wafer, eight inches size, thickness 3mm) for each front and back surfaces of forming a lens portion made of light-curing resin having a predetermined shape, imaging lens It was formed. Upon formation of the lens portion (curing of the photocurable resin) was irradiated with UV lamp 6000 mJ / cm 2. Then, each imaging lens together, to produce a plurality of similar imaging optical system and FIG. 5 by bonding through a spacer.
(1.1) Example 1
Among the plurality of imaging optical systems, an IR cut coating in Table 1 on the surface of the glass substrate of the first imaging lens (a plane) "coat type Type I", in the table 1 to the rear surface (b surface) " a material obtained by forming an IR cut coat of coat species type II "was used as a sample of" example 1 ".

When forming the IR cut coating is a glass substrate to the surface of one side and placed in a vacuum vapor deposition apparatus (a plane), in the manner shown in Table 1 "coat type Type I", the low refractive by vacuum evaporation the SiO 2 film as a percentage layers, alternately laminated TiO 2 film as a high refractive index layer (in total 18 layers) to form an IR cut coating. Then, once the vacuum evaporation apparatus to invert the glass substrate and air release, similar to that forming the IR cut coating on the surface, in the table 1 with respect to the opposite side rear surface (b surface) "coat species type to form an IR cut coating in the manner shown in II "(examples 2 to 6 described later, the method of forming the IR cut coating also in Comparative example 1 is the same.).

Incidentally, after formation of the IR cut coating retrieves the glass substrate from the vacuum evaporation apparatus subjected to silane coupling treatment on the IR cut coating (silane coupling agent (manufactured by Dow Corning Toray SZ-6030) in ethanol 0.1 diluted to ~ 2.0 wt%, this was added acetic acid to adjust the pH to 3-5, the solution is applied and dried onto a IR cut coating), to both sides of a glass substrate after the treatment forming a lens portion made of light-curing resin having a predetermined shape.
(1.2) Example 2
Among the plurality of imaging optical systems, an IR cut coating in Table 1 on the surface of the glass substrate of the second imaging lens (c plane) "coat type Type I", in the table 1 on the back surface (d surface) " forming an IR cut coating coats species type II "and the lens unit as a sample" example 2 ".
(1.3) Example 3
Among the plurality of imaging optical systems, the third IR cut coating of Table 1 of the surface (e surface) of the glass substrate of the imaging lens "coat type Type I", in the table 1 to the rear surface (f surface) " forming an IR cut coating coats species type II "and the lens unit as a sample" example 3 ".
(1.4) Comparative Example 1
Among the plurality of imaging optical systems, the surface of the glass substrate of the first imaging lens only in Table 1 (a face) "coat type Type I", to form an IR cut coating of "coat species Type II", the the lens unit and a sample of "Comparative example 1".

In the sample of Comparative Example 1, first formed an IR cut coating coats species type I in a glass substrate to form an IR cut coating coats species type II thereon.
(1.5) Example 4
Among the plurality of imaging optical systems, the first IR cut coating of Table 2 on the surface of the glass substrate of the imaging lens (a plane) "coat type Type III", Table 2 on the rear surface (b surface) " a material obtained by forming an IR cut coat of coat species type IV "was used as a sample of" example 4 ".
(1.6) Example 5
Among the plurality of imaging optical systems, an IR cut coating in Table 3 on the surface (a surface) of the glass substrate of the first imaging lens "coat type Type V" in the table 3 on the rear surface (b surface) " a material obtained by forming an IR cut coat of coat species type VI "was used as a sample of" example 5 ".

In the sample of Example 5, the film formation rate and 8 Å / sec at the time of forming the TiO 2 film of the IR cut coating and the deposition rate of the TiO 2 film is greater than coated seed type I ~ IV. In this case, the transmittance of the IR cut coating decreases wavelength 365nm to light (see Table 4).
(1.7) Example 6
Among the plurality of imaging optical systems, an IR cut coating in Table 3 on the surface (a surface) of the glass substrate of the first imaging lens "coat type Type I", in the table 3 on the rear surface (b surface) " a material obtained by forming an IR cut coat of coat species type II "was used as a sample of" example 6 ".

In the sample of Example 6 was not subjected to silane coupling treatment after the formation of the IR cut coating.

Figure JPOXMLDOC01-appb-T000001

Figure JPOXMLDOC01-appb-T000002

Figure JPOXMLDOC01-appb-T000003

(2) Evaluation of samples (2.1) in the measurement of each sample of the warpage of the glass substrate, by measuring the difference in height between the center portion and the peripheral portion of the time of forming the IR cut coating on a glass substrate, a glass substrate amount of warpage (deformation amount) was calculated. It shows the calculation results in Table 4. In Table 4, "○", "△", the reference of the "×" were as follows.

○ ... deformation Note exceeding deformation × ... 2mm deformation △ ... 1 ~ 2mm below 1 mm, when there is a deformation of more than 2mm the glass substrate is considered to be defective at the time of bonding with the spacer.
(2.2) in the measurement of each sample of the allowable size of foreign matter was measured either acceptable to the size of the extent incorporation of foreign matter into IR cut coating. The results are shown in Table 4. Since the appearance yield rate when the long side is at 20μm or less of the foreign matter is an interrupt defective 90%, if the long side of the table 4, the foreign matter exceeds 20μm as "○", the long side is 20μm is set to "△" in the case is less than or equal to.
(2.3) a curable Evaluation Each sample of the lens portion is immersed for 10 minutes in acetone, the lens unit a weight loss percent (resin) was measured to evaluate the cure of the lens unit from the measurement results. The evaluation results are shown in Table 4. Table 4, a "○" as a curing if less than 10% reduction is sufficient, it is determined that insufficient curing when more than 10% reduction elution was observed that the "△".
(2.4) in advance adhesion evaluation Each sample of the glass substrate and the lens unit taped to the lens unit, the lens unit is tested whether peeled from the glass substrate when peeling off the tape (Tape the peel test done) to evaluate the adhesion between the glass substrate and the lens unit from the test results. The evaluation results are shown in Table 4. In Table 4, if the separation of the lens portion is not observed it is determined that the "○" as the adhesion is sufficient, adhesion when peeling of the lens portion is observed is insufficient "△" It is set to.

Figure JPOXMLDOC01-appb-T000004

(3) From the results summary Table 4, the samples forming the IR cut coating respectively to front and back surfaces of the glass substrate, a small amount of warp of the glass substrate, to form an IR cut coating to both surfaces of a glass substrate , it proves useful in suppressing bending warpage of the glass substrate.

1 imaging unit 2 lens unit 21 stop 21a opening 23 imaging lens 25 spacer 25a opening 26 stop array 27 lens array 28 spacer array 4 sensor devices 5 casing 51 cylindrical portion 51a light transmission hole 53 base portion 100 glass substrate 102 surface 104 backside 110, 120 IR cut coating 130, 140 resin portion 132 and 142 a lens unit 134, 144 periphery 200 mold 202 cavity 210 light source 300, 400, 500 imaging lens 310, 410, 510 glass substrate 320,330,420, 430,520,530 resin portion

Claims (8)

  1. An imaging optical system having an imaging lens for forming a lens portion made of a curable resin on a glass substrate,
    Having at least one or more group of the imaging lens,
    An imaging optical system, characterized in that the IR cut coating is formed respectively to front and back surfaces of the glass substrate.
  2. In the imaging optical system according to claim 1,
    Wherein a total thickness r1 of the IR cut coating formed on one surface of the glass substrate, the total film thickness ratio r between the total thickness r2 of the other IR cut coating formed on the surface of the glass substrate, wherein It satisfies the condition imaging optical system characterized by (1).
    0.9 ≦ r (= r1 / r2) ≦ 1.1 ... (1)
  3. In the imaging optical system according to claim 1 or 2,
    The IR cut coating is a low refractive index layer A composed of a low refractive index material, an alternate multilayer film alternately stacked and a high refractive index layer B composed of a high refractive index material,
    Wherein the total thickness of the low refractive index layer A1 of the one surface formed IR cut coating of the glass substrate r (A1), the low refractive index layer of the other IR cut coating formed on the surface of the glass substrate A2 total film thickness ratio r (a) between the total thickness r (A2) of, satisfies the condition of formula (2), and the high refractive index layer of the IR cut coating formed on one surface of the glass substrate B1 total film thickness r (B1) of the total film thickness ratio r of the total film thickness r (B2) of the high refractive index of the other IR cut coating formed on the surface of the glass substrate layer B2 (B) is an imaging optical system, wherein a satisfies the equation (3).
    0.9 ≦ r (A) (= r (A1) / r (A2)) ≦ 1.1 ... (2)
    0.9 ≦ r (B) (= r (B1) / r (B2)) ≦ 1.1 ... (3)
  4. In the imaging optical system according to any one of claims 1 to 3,
    The glass substrate of the imaging lens, the peripheral portion made of a curable resin formed in the periphery of the lens portion is formed, the thickness of the peripheral portion which is formed on one surface of the glass substrate and t1 the thickness of the formed on one surface of the glass substrate the periphery and t2,
    The total thickness of the IR cut coating formed on one surface of the glass substrate and r1, when the total thickness of the IR cut coating formed on the other surface of the glass substrate was set to r2,
    Equation (4) or the imaging optical system, wherein the condition is satisfied that the formula (5).
    t1> t2, r1 <r2 ... (4)
    t1 <t2, r1> r2 ... (5)
  5. In the imaging optical system according to any one of claims 1 to 4,
    The imaging lens having two or more groups,
    Wherein in the imaging lens, the imaging optical system, wherein the imaging lens is not formed the IR cut coating to the glass substrate is placed on the image side.
  6. In the imaging optical system according to any one of claims 1 to 5,
    The curable resin is a photocurable resin,
    The IR cut coating is, the imaging optical system characterized by having a transmissivity of 50% or more for light having a wavelength of 365 nm.
  7. In the imaging optical system according to claim 6,
    Image pickup optical system wherein the light curable resin is characterized in that an acrylic resin or epoxy resin.
  8. Forming an IR cut coating to both surfaces of the glass substrate,
    And performing a silane coupling treatment on the IR cut coating,
    Forming a lens portion made multiple curable resin on the IR cut coating after the silane coupling treatment,
    And cutting the glass substrate for each of the lens unit,
    Method for manufacturing an imaging lens, characterized in that it comprises a.
PCT/JP2009/059962 2008-06-25 2009-06-01 Imaging optical system, and imaging lens manufacturing method WO2009157273A1 (en)

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