JP2003139916A - Laminated lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated lens having no problem of distortion, peeling or the like even when a lens of a large diameter or a lens made of a special glass material such as fluorite, low dispersion glass or the like is laminated. SOLUTION: The laminated lens is constituted by laminating the joining faces of at least two lenses L1, L2 with an adhesive. The adhesive layer 13 consisting of the adhesive has elasticity and satisfies the condition (1): |Δα.D/d|<0.03, wherein Δα is the difference in the coefficient of linear thermal expansion in the two lenses to be laminated, D is the diameter of the joining faces of the lenses and d is the thickness of the adhesive layer.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a cemented lens used in various optical systems.

[0002]

2. Description of the Related Art A contact type achromatic lens in which at least two lenses, a positive lens and a negative lens, are arranged with a slight air gap, is widely used. Since the contact type achromatic lens gives a strong power to both the positive lens and the negative lens to correct the axial chromatic aberration, both the convex surface and the concave surface facing each other with an air gap have strong surface power. For this reason, when one lens is decentered with respect to the other lens, strong coma and flare occur, and the performance is extremely deteriorated. In order to prevent this performance deterioration, in the conventional contact-type achromatic lens, the lens outer diameter and the lens frame must be processed with high accuracy to suppress the eccentricity of the lens, which results in high cost.

On the other hand, a cemented lens obtained by laminating a pair of properly aligned lenses with an adhesive does not cause eccentricity, so that it is possible to obtain an achromatic lens without performance deterioration due to eccentricity. However, in a cemented lens in which two lenses made of glass materials having different linear expansion coefficients are cemented, when the temperature changes, the two lenses have different expansions (contractions), which causes a difference in lens outer diameter. This difference in lens outer diameter causes radial stress applied to the cemented surface, especially when the temperature changes greatly, the stress applied to the cemented surface becomes large and the lens is distorted or the adhesive layer on the cemented surface cannot withstand the stress. There is a problem that the pasted lens peels off when it disappears.

In particular, the larger the lens outer diameter, the larger the difference in lens outer diameter caused by expansion. Therefore, the above-mentioned problem becomes remarkable in a cemented lens having a large aperture. Further, fluorite and low-dispersion glass are often used for high-performance lenses because of their excellent achromaticity characteristics, but these special glass materials have a coefficient of linear expansion that is at least twice that of general optical glass. Therefore, when the lens made of these special glass materials and the lens made of general optical glass are bonded together, the above problem becomes more remarkable.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and in a cemented lens in which the cemented surfaces of at least two lenses are bonded together with an adhesive, problems such as distortion and peeling occur. The purpose is to obtain a cemented lens that does not occur. An object of the present invention is to obtain a suitable cemented lens by applying it to a large-diameter cemented lens, or a special glass material such as fluorite or low-dispersion glass and a normal glass lens. It is another object of the present invention to obtain a cemented lens which is less likely to deteriorate in optical performance due to elastic deformation of an adhesive layer even in an achromatic lens which requires high optical performance.

[0006]

SUMMARY OF THE INVENTION According to the present invention, in a cemented lens constructed by laminating at least two lenses, an appropriate thickness is given to an adhesive layer on a cemented surface, and an appropriate expansion and contraction is possible even after curing. This is based on the idea that the adhesive layer absorbs the stress generated on the joint surface due to the difference in expansion of the bonded lenses by using the elastic adhesive. Further, the present invention is based on the idea that the self-weight deformation due to the elasticity of the adhesive layer is minimized by optimizing the thickness of the adhesive layer to the minimum necessary thickness according to the usage situation. It is a thing.

That is, according to the present invention, in a cemented lens constructed by bonding the cemented surfaces of at least two lenses with an adhesive, the adhesive layer on the cemented surface has elasticity capable of expanding and contracting even after curing. And satisfying the following conditional expression (1). (1) | Δα · D / d | <0.03 where Δα: difference in linear expansion coefficient between a pair of lenses sandwiching the cemented surface, D: diameter of the cemented surface, d: adhesive on the cemented surface The layer thickness is

The cemented lens according to the present invention more preferably satisfies the following conditional expression (1 '). (1 ′) | Δα · D / d | <0.01 Further, it is preferable that the following conditional expression (2) is satisfied. (2) d / D <0.002

The present invention is practically applied to an achromatic lens in which two lenses to be bonded are a positive lens and a negative lens. This achromatic lens has the following conditional expression (3).
Alternatively, it is preferable to satisfy (4). (3) | Δν |> 20 (4) | fc ・ (1 / (fp ・ νp) + 1 / (fn ・ νn))
│ <0.02 where fc: focal length of the cemented lens, fp: focal length of the positive lens, fn: focal length of the negative lens, νp: Abbe number of the positive lens, νn: of the negative lens The Abbe number is.

The cemented lens according to the present invention preferably satisfies at least one of the following conditional expressions (5) to (7). (5) d> 0.015mm (6) d <0.2mm (7) D> 80mm

The cemented lens according to the present invention is preferably applied to a cemented lens made of a combination of glass materials satisfying the following conditional expression (8). (8) | Δα |> 0.0000015

The adhesive is preferably a silicone resin made of an organic silicone compound, and particularly preferably a silicone resin having addition reaction curability. Alternatively, the adhesive may be composed of a silicone resin having an elongation of 100% or more. The elongation is defined by JIS standard and is expressed by the amount of elongation / original length × 100. That is, for example, an elongation of 100% is twice as long, and an elongation of 150% is twice as long.

[0013]

1 and 2 show an embodiment of a cemented lens according to the present invention. This cemented lens is configured by bonding the lens cemented surfaces of the positive first lens L1 and the negative second lens L2 together with the adhesive layer 13. Convex first lens second surface (lens cemented surface) 11
And the second lens first surface (lens cemented surface) 12 which is a concave surface are opposed to each other with a predetermined space (a slight space) therebetween, and the space between them is filled with an adhesive, and the adhesive layer 13 is formed by this adhesive. Are formed. The convex first lens second surface 11 and the concave second lens first surface 12 have the same radius of curvature, and therefore the thickness of the adhesive layer 13 is kept constant in the radial direction.

Each conditional expression of the present invention will be described together with specific examples (examples). Now, the cemented lens of FIGS. 1 and 2 is configured by cementing a positive first lens L1 made of a glass material FPL53 made by OHARA and a negative second lens L2 made of NSL36 in order from the object side. Use an achromatic lens. The lens diameter (bonding surface diameter) is 100 mm. The convex first lens second surface 11 that is a lens cemented surface and the concave second lens first surface 12 have the same radius of curvature, and are bonded so that the adhesive layer 13 has a thickness of 0.1 mm. ing. The adhesive forming the adhesive layer 13 is an addition reaction type silicone resin KE109 manufactured by Shin-Etsu Chemical Co., Ltd., and the distance between the first lens second surface 11 and the second lens first surface 12 is 0.1 mm. And hold at 40 ℃ for 1
Cured in 2 hours.

The linear expansion coefficient of FPL53 is 142 × 1.
0 ^-7 , the coefficient of linear expansion of NSL36 is 76 × 10 ^-7 , so the temperature of this cemented lens is from 40 ℃ at the time of joining to 1
If the temperature changes to 0 ° C., the diameter of the first lens L1 contracts by 0.043 mm, and the diameter of the second lens L2 decreases by 0.043 mm.
When contracted by 23 mm, a diameter difference of 0.02 mm is generated between the first lens L1 and the second lens L2. This difference in diameter indicates that a displacement of 0.01 mm occurs in the radial direction between the outer peripheral portion of the first lens L1 and the outer peripheral portion of the second lens L2, and this displacement is caused by the lens cemented surface (11, 12). ) Is given a radial shear stress. The shear stress in the radial direction is small near the optical axis A, increases with increasing distance from the optical axis A in the radial direction, and becomes maximum at the lens outer peripheral portion.

It is empirically said that in the conventional cemented lens, the thickness of the adhesive layer is about several μ. When the above lenses are pasted together by the conventional technique, the shearing stress cannot be absorbed by the adhesive layer because the displacement of the lens outer peripheral portion due to linear expansion reaches several times the thickness of the adhesive layer. Therefore, when the adhesive strength of the adhesive forming the adhesive layer is strong, distortion occurs in the lens, and when the adhesive strength is weak, the adhesive layer cannot withstand the shear stress and the bonded lens is It will come off.

As described above, the lens L1,
The deviation at the outer peripheral portion of the cemented lens caused by the expansion of L2 is determined by the difference in the linear expansion coefficient between the cemented lenses L1 and L2, the diameter of the lenses L1 and L2, and the width of temperature change. Can be represented. Δh = Δα · D · ΔT / 2, where Δh: deviation of the outer peripheral portion of the cemented lens caused by expansion of the lens due to temperature change, Δα: difference in linear expansion coefficient between the cemented lenses, D : Diameter of the cemented lens, ΔT: width of temperature change,

Assuming that the adhesive has elasticity and has an elongation of 100%, if the thickness of the adhesive layer is at least twice the above Δh, the shearing stress generated in the adhesive layer by Δh is The elasticity of the layer allows for a good absorption. That is, when the relationship of the following equation is satisfied, the stress applied to the cemented surface due to the expansion of the lens can be absorbed by the adhesive layer. 2 · | Δh | <d, where d is the thickness of the adhesive layer on the bonding surface. The following equation is derived from the above equation and the equation. │Δα ・ D / d│ <1 / ΔT

Conditional expression (1) shows the case where the range of temperature change is assumed to be 30 ° C. in the above expression, and by defining the relationship of each numerical value in this way, the cemented surface is affected by the expansion of the lens. The stress can be absorbed by the adhesive layer. If the upper limit of conditional expression (1) is exceeded, the adhesive layer becomes too thin, and the stress applied to the joint surface cannot be absorbed by the adhesive layer.

The above-mentioned specific numerical values satisfy this conditional expression (1), and the thickness of the adhesive layer 13 becomes thicker. Therefore, the above-mentioned deviation of the lens outer peripheral portion is caused by the thickness of the adhesive layer 13. 1 /
Adhesive K that is about 10 and forms the adhesive layer 13
E109 has an elongation of about 150%. Therefore, the displacement of the lens outer peripheral portion due to the linear expansion can be easily absorbed by the adhesive layer 13.

Considering the workability of joining, the environment of use, the optical characteristics of the adhesive, the cost, etc., it is not always possible to use an adhesive having ideal elasticity. In such a case, it is preferable to define the thickness of the adhesive layer by the conditional expression (1 ′). If the upper limit of conditional expression (1 ′) is exceeded, the adhesive layer becomes too thin, and the stress applied to the joint surface cannot be absorbed by the adhesive layer depending on the elasticity of the adhesive.

When the lenses are bonded together by using an adhesive that is still elastic even after curing, if the adhesive layer is made too thick, the adhesive layer will be elastically deformed due to the weight of the lenses, and the bonded lenses will be different from each other. There is a problem that misalignment occurs. By optimizing the thickness d of the adhesive layer according to the conditional expression (2), the misalignment of the lens can be suppressed to be small. If the upper limit of conditional expression (2) is exceeded, the adhesive layer will become too thick, and the performance will deteriorate due to misalignment of the lens.

As described above, the cemented lens in which the adhesive layer has the minimum necessary thickness and the misalignment of the lens due to the elastic deformation of the adhesive layer is suppressed to a small level is particularly effective in an achromatic lens in which the performance is significantly reduced due to the misalignment. Has preferred suitability. However, if the difference in Abbe number between the positive lens and the negative lens to be cemented is increased by the conditional expression (3), chromatic aberration can be satisfactorily corrected even if the difference in power between the positive lens and the negative lens is small. Therefore, it is possible to further suppress the performance deterioration due to the misalignment of the negative lens. If the lower limit of conditional expression (3) is exceeded, in order to satisfactorily correct chromatic aberration, it is necessary to increase the difference in power between the positive lens and the negative lens, and the performance will be significantly degraded due to misalignment.

Conditional expression (4) is a condition for the cemented lens to which the present invention is applied to be an achromatic lens in which chromatic aberration is favorably corrected. A cemented lens that exceeds the upper limit of conditional expression (4) and is insufficient in chromatic aberration correction does not require high accuracy, and therefore there is no cost advantage of applying the present invention.

In the present invention, the lower limit of the thickness of the adhesive layer is defined by the conditional expression (1) or (1 '), but the thickness of the adhesive layer may be different from the conventional one depending on the difference in the lens diameter and the linear expansion coefficient. In some cases, it may be as thin as a cemented lens. Conditional expression (5) is a condition for defining the lower limit of the thickness of the adhesive layer suitable for applying the present invention. When the lower limit of conditional expression (5) is exceeded,
Since the thickness of the adhesive layer may be as thin as the conventional cemented lens, the cost advantage of applying the present invention is lost.

Although the upper limit of the thickness of the adhesive layer is defined by the conditional expression (2), the thickness of the adhesive layer becomes too thick depending on the difference in the lens diameter and the coefficient of linear expansion. There is a case where the core misalignment due to the elastic deformation of is too large. By defining the upper limit of the thickness of the adhesive layer by the conditional expression (6), it is possible to obtain a bonded lens having a small misalignment due to elastic deformation of the adhesive layer. When the upper limit of conditional expression (6) is exceeded, the thickness of the adhesive layer becomes too thick, and the misalignment due to elastic deformation of the adhesive layer becomes too large.

As described above, in the cemented lens according to the present invention, the thickness of the adhesive layer may be small depending on the difference in lens diameter and linear expansion coefficient. Conditional expression (7) is a condition for maximizing the effect of the present invention by defining the diameter D of the cemented lens to which the present invention is applied. If the lower limit of conditional expression (7) is exceeded, it becomes unnecessary to increase the thickness of the adhesive layer, and the cost advantage of applying the present invention is lost.

Further, the present invention is particularly suitable for bonding a lens using a glass material having a large linear expansion coefficient such as fluorite or low-dispersion glass to a lens using a general glass material,
In particular, it is effective to attach lenses having large differences in linear expansion coefficient as shown in conditional expression (8). When the lenses having a small difference in linear expansion coefficient, which exceeds the lower limit of the conditional expression (8), are attached to each other, it is not necessary to increase the thickness of the adhesive layer, so that there is no cost advantage of applying the present invention. I will end up.

In the specific example of the cemented lens of FIGS. 1 and 2, a silicon resin made of an organic silicon compound was used as an adhesive. Although there are various types of silicone resins, they have stable chemical properties, and those with a transparent cured product are suitable for use in bonding lenses. In particular, a cured product which is rich in elasticity and whose elasticity does not change even at a low temperature is suitable for use in bonding large-diameter lenses or lenses having large differences in linear expansion coefficient.

The silicone resin is roughly classified into an addition reaction type which is cured by heating and a condensation reaction type which is cured by reacting with moisture in the air, depending on the curing process. When the lenses are stuck together with a condensation reaction type silicone resin, it is difficult to cure since the central part is difficult to be supplied with water. On the other hand, some of the addition reaction type silicone resins are cured at room temperature, which is suitable for application of lenses.

In the present invention, the silicone resin used for the adhesive is preferably one that is elastic and rich in elasticity even after curing, and particularly preferably one that exhibits an elongation of 100% or more.

In the present invention, the adhesive layer is set to the minimum necessary thickness so that the stress applied to the lens joint surface due to the expansion (contraction) of the cemented lens is absorbed by the adhesive layer. The present invention is not necessarily applied only to the application of a lens having a large aperture or a lens having a large difference in linear expansion coefficient, and good results can be obtained even when applied to a cemented lens used in an environment having a wide temperature range.

Specific numerical examples will be described below with reference to tables and drawings. In the table and drawings, F _{N O.} is F number, F
Is the focal length, W is the incident angle (°), FB is the back focus, R is the radius of curvature of each lens surface, D is the lens thickness or lens spacing, Nd is the d-line refractive index, and ν is the Abbe number. In the various aberration diagrams, SA indicates spherical aberration and SC indicates sine condition. The d-line, the g-line, and the c-line show the chromatic aberration of each wavelength indicated by the spherical aberration.

[Numerical Example 1] FIG. 3 is a lens configuration diagram of Numerical Example 1 of the cemented lens according to the present invention, FIG. 4 is a diagram showing various aberrations thereof, and Table 1 is lens data thereof. In Numerical Data Example 1, as described in the above specific example, the positive first lens L1 made of the glass material FPL53 made by OHARA, and NSL3.
The negative second lens L2 made of 6 is attached by an addition reaction type silicone resin KE109 manufactured by Shin-Etsu Chemical Co., Ltd. The curing condition is that the distance between the first lens L1 and the second lens L2 is maintained to be 0.1 mm, and then 40 ° C. 1
Cured in 2 hours. The second surface to the third surface are adhesive layers, and the refractive index and Abbe number of this adhesive layer are measured values. The lens diameter of Numerical Example 1 is 100 mm.

[0035]

[Table 1] F _NO. = 1: 9.0 F = 899.73 W = 1.40 FB = 888.23 Face NO. RD Nd ν 1 425.975 12.00 1.4388 95.0 2 -309.261 0.10 1.356 34.4 3 -309.261 8.00 1.5174 52.4 4 -1532.722---

[Numerical Example 2] FIG. 5 is a lens configuration diagram of Numerical Example 2 of the cemented lens according to the present invention, FIG. 6 is a diagram showing various aberrations thereof, and Table 2 is the lens data thereof. In Numerical Embodiment 2 three lenses, in order from the object side, are a negative first lens L1 made of OHARA glass material BSL7, a positive second lens L2 made of FPL53, and a negative third lens L3 made of NSL36. It is an achromatic lens constructed by bonding.

In this numerical example, the first lens L1 and the second lens
The technology of the cemented lens according to the present invention is applied to the lens L2 and the relationship between the second lens L2 and the third lens L3, respectively, and the concave second surface and the convex third surface, which are joint surfaces, are applied.
And the fourth surface of the convex surface and the fifth surface of the concave surface have the same radius of curvature, and the thickness of the adhesive layer is 0.
It is pasted so as to be 1 mm. The lens diameter in this numerical example is 100 mm. The adhesive and curing conditions are the same as in Numerical Example 1.

[0038]

[Table 2] F _NO. = 1: 9.0 F = 899.71 W = 1.40 FB = 878.61 Face NO. RD Nd ν 1 374.129 10.00 1.5163 64.1 2 195.890 0.10 1.356 34.4 3 195.890 12.50 1.4388 95.0 4 -579.852 0.10 1.356 34.4 5 -579.852 10.00 1.5174 52.4 6 -1968.229---

[Numerical Example 3] FIG. 7 is a lens configuration diagram of Numerical Example 3 to which the cemented lens according to the present invention is applied, FIG. 8 is a diagram showing various aberrations thereof, and Table 3 is lens data thereof. Numerical Example 3 is, in order from the object side, a positive first lens L1 made of a glass material FPL53 made by OHARA and a cemented lens made by pasting a negative second lens L2 made of NSL36, with a space therebetween. Positive third lens L arranged as
3 and the negative fourth lens L4, and the first lens L
The technique of the cemented lens according to the present invention is applied to the cementing of the first lens L2 and the second lens L2. The lens diameter of the first lens and the second lens is 100 mm.

In Numerical Embodiment 3, the radius of curvature of the convex second surface and the concave third surface which are the cemented surfaces of the first lens and the second lens are the same, and the thickness of the adhesive layer is 0. They are attached to each other to have a thickness of 0.1 mm. The adhesive and curing conditions are the same as in Numerical Example 1.

[0041]

[Table 3] F _NO. = 1: 6.0 F = 600.06 W = 2.10 FB = 228.01 Face NO RD Nd ν 1 354.940 12.50 1.4388 95.0 2 -279.126 0.10 1.356 34.4 3 -279.126 8.00 1.5174 52.4 4 -1793.782 453.80--5 117.859 6.00 1.4970 81.6 6 -113.351 4.30--7 -101.393 4.00 1.4875 70.2 8 145.248---

Table 4 shows numerical values corresponding to each conditional expression of each numerical example. Each numerical example satisfies each conditional expression.

[0043]

[Table 4]       Numerical Example 1 Numerical Example 2 Numerical Example 2 Numerical Example 3                      (1st and 2nd lens) (2nd and 3rd lens) ｜ Δα ・ D / d ｜           0.0066 0.0068 0.0066 0.0066 d / D 0.001 0.001 0.001 0.001 ｜ Δν ｜ 42.6 30.9 42.6 42.6 | fc ・ (1 / (fp ・ νp) ＋ 1 / (fn ・ νn)) |           0.000196 0.00703 0.00822 0.000347 d 0.10 0.10 0.10 0.10 D 100.0 100.0 100.0 100.0 | Δα | 0.0000066 0.0000068 0.0000066 0.0000066 αp 0.0000142 0.0000142 0.0000142 0.0000142 αn 0.0000076 0.0000074 0.0000076 0.0000076 νp 95.0 95.0 95.0 95.0 νn 52.4 64.1 52.4 52.4 fc 899.99 577.74 423.57 805.65 fp 410.42 335.38 335.38 358.19 fn -750.45 -811.86 -1592.61 -640.02

[0044]

EFFECTS OF THE INVENTION According to the present invention, a bonded lens, in particular, a large-diameter bonded lens, or a lens made of a special glass material such as fluorite or low dispersion glass and a normal glass lens are bonded together. Even with a lens, it is possible to obtain a bonded lens that does not cause problems such as distortion and peeling. Further, according to the present invention, it is possible to obtain a cemented lens in which a deterioration in optical performance due to self-weight deformation is small even in an achromatic lens that requires high optical performance.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a cemented lens according to the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a lens configuration diagram of Numerical Example 1 of a cemented lens according to the present invention.

FIG. 4 is a diagram of various types of aberration of the cemented lens of FIG.

FIG. 5 is a lens configuration diagram of Numerical Example 2 of a bonded lens according to the present invention.

6 is a diagram of various types of aberration of the cemented lens of FIG.

FIG. 7 is a lens configuration diagram of Numerical Example 3 of the bonded lens according to the present invention.

FIG. 8 is a diagram of various types of aberration of the cemented lens of FIG.

[Explanation of symbols] L1 first lens L2 second lens 11 12 Bonding surface 13 Adhesive layer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazunori Komori             2-36 Maeno-cho, Itabashi-ku, Tokyo Asahikou             Gaku Kogyo Co., Ltd. F-term (reference) 2H043 AE02 AE17 AE23                 2H087 KA01 LA01 LA02 NA08 NA15                       PA01 PA03 PA18 PB02 PB03                       PB04 QA02 QA06 QA07 QA14                       QA17 QA21 QA22 QA25 QA26                       QA37 QA39 QA41 QA46 UA04                       UA06

Claims (12)

[Claims] 1. In a cemented lens constructed by bonding the cemented surfaces of at least two lenses with an adhesive, the adhesive layer of the cemented surfaces has elastic properties and the following conditional expression A laminated lens characterized by satisfying 1). (1) | Δα · D / d | <0.03, where Δα: the difference in linear expansion coefficient between the two lenses to be bonded together, D: the diameter of the bonding surface, d: the adhesive layer of the bonding surface thickness. 2. The cemented lens according to claim 1, wherein
A cemented lens that satisfies the following conditional expression (1 '). (1 ′) | Δα · D / d | <0.01 3. The cemented lens according to claim 1, wherein the cemented lens satisfies the following conditional expression (2). (2) d / D <0.002 4. The cemented lens according to claim 1, wherein the two lenses are a positive lens and a negative lens and satisfy the following conditional expression (3). . (3) | Δν |> 20 where Δν: the difference in Abbe number between the positive lens and the negative lens. 5. The cemented lens according to claim 4, wherein:
A cemented lens that satisfies the following conditional expression (4). (4) | fc ・ (1 / (fp ・ νp) + 1 / (fn ・ νn))
│ <0.02 where fc: focal length of the cemented lens, fp: focal length of the positive lens, fn: focal length of the negative lens, νp: Abbe number of the positive lens, νn: of the negative lens Abbe number. 6. The cemented lens according to claim 1, wherein the cemented lens satisfies the following conditional expression (5). (5) d> 0.015mm 7. The cemented lens according to claim 1, wherein the cemented lens satisfies the following conditional expression (6). (6) d <0.2 mm 8. The cemented lens according to claim 1, wherein the cemented lens satisfies the following conditional expression (7). (7) D> 80 mm 9. The cemented lens according to claim 1, wherein the cemented lens satisfies the following conditional expression (8). (8) | Δα |> 0.0000015 10. The cemented lens according to claim 1, wherein the adhesive is made of a silicone resin made of an organic silicon compound. 11. The cemented lens according to claim 10, wherein the silicone resin has an addition reaction curability. 12. The cemented lens according to claim 1, wherein the adhesive is a silicone resin having an elongation of 100% or more.