JP2008139748A - Composite optical element, composite optical element manufacturing method, and composite optical element manufacturing apparatus - Google Patents

Abstract

Provided is a composite optical element that is highly productive and that suppresses light reflection on the peripheral surface of a lens having a highly reliable junction structure with improved adhesion between a light-shielding film and a lens substrate.
A glass lens, a resin lens provided on one surface of the glass lens, and a light shielding film provided on a non-optically effective surface of the glass lens. This light shielding film 5 contains a photocurable resin. Therefore, it is not necessary to perform the summing process twice as in the conventional case, and the productivity is excellent, and the adhesion between the light shielding film 5 and the glass lens 1 is enhanced, and the reliability is improved.
[Selection] Figure 1

Description

  The present invention relates to a composite optical element, and more particularly to a composite optical element in which a resin molding layer having a light-shielding film is bonded to a non-optical effective surface, a manufacturing method thereof, and a manufacturing apparatus thereof.

  As in the case of a lens used in an optical system such as a camera, ink is applied to prevent reflection on the peripheral surface of a lens built in a lens barrel. Such a technique is also applicable to a compound lens in which a glass lens often used in this type of optical system in recent years and a resin layer having a predetermined shape are joined.

  A compound lens that is such a compound optical element is generally a glass lens substrate having a spherical surface (or a rough aspheric surface; the same applies hereinafter), and an aspheric surface that is bonded to the spherical surface of the glass lens substrate. And a thin resin molding layer (for example, a thickness of 5 μm to 100 μm). Any of the resins forming the glass lens substrate and the resin molding layer can be obtained at a low production cost.

  FIG. 9 is a cross-sectional view showing an example of the prior art. A part of the lens 101 formed of glass is coated with a silane coupling agent 103 on the glass in order to enhance bonding at the interface between the glass and the resin, and the silane coupling agent 103 is interposed at the interface between the inorganic substance and the organic substance. As a result, a bond between the resin, the silane coupling agent, and the inorganic substance is formed, and the glass lens 101 and the resin lens 102 are integrated. A black film 106 coated with black ink is formed as a light-shielding film on the ineffective surface of the lens including the peripheral surface of the cemented aspherical lens to complete the lens.

  However, in such a conventional lens, the silane coupling agent 103 is used so that moisture or the like enters between the glass lens 101 and the resin lens 102 to deteriorate the bonding and the bonded lens is not dropped. Since application to the periphery of the glass lens 101 is performed, a part of the silane coupling agent 103 exists to the periphery of the glass lens 101. Since this silane coupling agent 103 has low adhesion at the interface with the black ink film 106 applied to the outer surface thereof, this interface becomes whitened, and as shown by the arrows in FIG. The light projected on the inner surface of the surface is reflected with a high reflectance. For this reason, when this lens is incorporated into a lens mirror or the like to constitute a lens optical system, abnormal reflection occurs in which light incident toward the lens peripheral surface is reflected toward the inside of the lens barrel, resulting in flare and ghosting. Cause it to occur.

  Therefore, conventionally, a light-shielding film is interposed between at least the ineffective surface and the silane coupling agent of a composite lens in which a glass lens and a resin lens are bonded with a silane coupling agent (Japanese Patent Laid-Open No. 11-64607). Publication: see Patent Document 1).

For this reason, the black light-shielding film is not formed on the surface of the silane coupling agent on the ineffective surface of the lens, preventing light reflection at the interface between the silane coupling agent and the light-shielding film. This prevents flare and ghosting caused by abnormal reflection in the lens barrel of the lens optical system.
JP-A-11-64607

  However, in the above-described conventional compound lens, black is applied to the lens peripheral surface, a silane coupling agent is applied thereon, and then black is applied. That is, the sanitization process is performed twice, which is disadvantageous in terms of productivity. In addition, since the adhesion between black and silane coupling is low, there is a problem that the ink film peels off or cracks occur due to moisture absorption.

  Therefore, the object of the present invention is to provide a composite optical element that suppresses light reflection on the peripheral surface of a lens having a highly reliable joint structure with high productivity and improved adhesion between the light shielding film and the lens substrate, It is in providing this manufacturing method and this manufacturing apparatus.

In order to solve the above problems, the composite optical element of the present invention is
A lens substrate;
A resin lens provided on at least one surface of the lens substrate;
A light-shielding film provided on the non-optically effective surface of the lens substrate,
This light shielding film is characterized by containing an energy curable resin.

  According to the composite optical element of the present invention, since the light shielding film provided on the non-optically effective surface of the lens base material includes the energy curable resin, it is not necessary to perform the sanitizing process twice as in the prior art. In addition to excellent productivity, the adhesion between the light-shielding film and the lens base material is improved, and the reliability is improved.

In the composite optical element of one embodiment,
The light shielding film is
A photocurable resin;
And light shielding particles dispersed in the photocurable resin.

  According to the composite optical element of this embodiment, since the light shielding film includes the photocurable resin and the light shielding particles, the silane coupling applied to the circumferential surface of the light shielding film and the lens substrate. Adhesiveness with the agent is improved.

  In one embodiment, the ratio of the light-shielding particles to the photocurable resin and the light-shielding particles is 5% by weight to 30% by weight.

  According to the composite optical element of this embodiment, the ratio of the light-shielding particles to the light-curable resin and the light-shielding particles is 5% by weight to 30% by weight. The light-shielding film can be reliably cured and has a light-shielding effect. On the other hand, when the proportion of the light shielding particles is less than 5% by weight, the light shielding effect of the light shielding film is reduced, whereas when the proportion of the light shielding particles is more than 30% by weight, the photocurable property is decreased. The light transmittance to the resin is lowered, and the light shielding film cannot be formed.

  In one embodiment, the light shielding film has a thickness of 5 μm to 100 μm before the photocurable resin is cured.

  According to the composite optical element of this embodiment, since the thickness of the light shielding film in a state before the photocurable resin is cured is 5 μm to 100 μm, the photocurable resin is reliably cured by light. Thus, the light shielding film having a light shielding effect can be reliably formed. On the other hand, if the thickness of the light shielding film is less than 5 μm, the light shielding effect of the light shielding film is reduced. On the other hand, if the thickness of the light shielding film is larger than 100 μm, light is transmitted to the photocurable resin. The rate decreases and the light shielding film cannot be formed.

In addition, the method for manufacturing the composite optical element of the present invention includes:
An energy curable resin application step of applying an energy curable resin for resin lens molding to at least one surface of the lens substrate;
A shape transfer step of closely attaching a resin lens mold of a predetermined shape to the energy curable resin;
A resin lens molding step of applying a predetermined energy to the energy curable resin, curing the energy curable resin, and molding a resin lens;
A light-shielding film molding step in which a non-optically effective surface of the lens base material is coated with a resin for light-shielding film molding and cured to form a light-shielding film;
And a release step of releasing the resin lens from the resin lens mold.

  According to the composite optical element manufacturing method of the present invention, the energy curable resin coating step, the shape transfer step, the resin lens molding step, the light shielding film molding step, and the mold release step are provided. Therefore, it is not necessary to perform the sanitization process twice as in the prior art, and the productivity of the composite optical element is excellent, and the adhesion between the light shielding film and the lens base material is improved, so that the composite optical element is improved. Reliability is improved.

  In the method of manufacturing a composite optical element according to one embodiment, the light shielding film forming step is performed before the releasing step.

  According to the method for manufacturing a composite optical element of this embodiment, since the light shielding film molding step is performed before the mold release step, the light shielding film is in a state where the resin lens molding die is in close contact with the resin lens. The molding resin can be coated and cured, and the light shielding film molding resin does not enter the optically effective diameter of the resin lens.

In the method of manufacturing a composite optical element according to one embodiment,
The light shielding film forming step includes:
Irradiating and curing the light curable resin in which the light shielding particles are dispersed to form the light shielding film; and
Releasing the light shielding film from the light shielding film mold.

  According to the method for manufacturing a composite optical element of this embodiment, the light shielding film forming step includes the steps of forming the light shielding film by irradiating and curing the photocurable resin, and forming the light shielding film as a light shielding film. Including the step of releasing from the molding die, the light shielding film can be reliably molded by the die.

In addition, the composite optical element manufacturing apparatus of the present invention includes:
A resin lens mold having a transfer surface for transferring a predetermined shape to an energy curable resin for resin lens molding applied to at least one surface of the lens substrate;
A lens substrate holding member for holding the lens substrate;
A pressing guide member that guides the resin lens mold so that the optical axis of the lens base and the optical axis of the resin lens mold coincide with each other while pressing the lens base against the lens base holding member;
A light-shielding film molding die is provided which is formed by covering and spreading the light-shielding film-forming resin on the non-optically effective surface of the lens base material and molding the light-shielding film.

  According to the composite optical element manufacturing apparatus of the present invention, since the resin lens molding die, the lens base material holding member, the pressing guide member, and the light shielding film molding die are provided, a black ink can be used as in the related art. It is not necessary to perform the coating process twice, so that the productivity of the composite optical element is excellent, and the adhesion between the light shielding film and the lens substrate is enhanced, thereby improving the reliability of the composite optical element.

  According to the composite optical element of the present invention, since the light shielding film provided on the non-optically effective surface of the lens base material includes the energy curable resin, it is not necessary to perform the sanitizing process twice as in the prior art. In addition to excellent productivity, the adhesion between the light-shielding film and the lens base material is improved, and the reliability is improved.

  Further, according to the method for producing a composite optical element of the present invention, the energy curable resin coating step, the shape transfer step, the resin lens molding step, the light shielding film molding step, and the mold release step. Therefore, it is not necessary to perform the sanitizing process twice as in the prior art, and the productivity of the composite optical element is excellent, and the adhesion between the light shielding film and the lens substrate is improved, so that the composite optical The reliability of the element is improved.

  Further, according to the composite optical element manufacturing apparatus of the present invention, since the resin lens molding die, the lens base material holding member, the pressing guide member, and the light shielding film molding die are provided, In addition, it is not necessary to perform the sacrificing process twice, so that the productivity of the composite optical element is excellent, and the adhesion between the light shielding film and the lens substrate is improved, thereby improving the reliability of the composite optical element. .

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

  FIG. 1 is a side sectional view showing an embodiment of a composite lens as a composite optical element of the present invention. FIG. 2 is an enlarged cross-sectional view of a part of FIG. This compound lens has a glass lens 1 as a lens substrate having a gently convex front surface and a concave spherical rear surface, and an aspherical surface bonded to the concave spherical surface of the rear surface of the glass lens 1 by bonding. The resin lens 2 is used.

  The thickness of the resin lens 2 can be, for example, 5 μm to 100 μm at the center, but the present invention does not depend on the thickness of the resin lens 2. A silane coupling agent 3 is applied to the interface between the glass lens 1 and the resin lens 2 in order to improve the adhesion.

  Here, in the glass lens 1, a light shielding film 5 is formed on a lens non-effective surface, that is, in a region extending from the peripheral portion 12 to the peripheral surface 13 of the concave spherical surface 11 on the rear surface of the lens in FIG. Further, the light shielding film 5 covers the entire surface or a part of the end portion 22 of the resin lens 2, but the transfer surface 21 of the resin lens 2 is never covered. The transfer surface 2 of the resin lens 2 is coated with an antireflection film 4.

  Here, the light shielding film 5 includes a photocurable resin as an energy curable resin and light shielding particles dispersed in the photocurable resin. Examples of the particles having a light shielding effect include black pigments such as carbon black and aniline black. Since a photocurable resin is used for the base of the light shielding film 5, the adhesion between the light shielding film 5 and the silane coupling agent 3 applied to the peripheral surface of the glass lens 1 is good.

  In addition, as a lens base material, the lens by which both surfaces were grind | polished to the spherical surface can also be used, However, You may use the lens which one surface or both surfaces have an aspherical surface. Of course, the lens used as the lens base material may be a molded glass lens produced by molding, and further, not only a glass lens but also a plastic lens may be used as the lens base material.

  Here, the ratio of the light-shielding particles to the photocurable resin and the light-shielding particles, the thickness of the light-shielding film 5 in a state before the photocurable resin is cured, and the photocurable resin The relationship between curing and non-curing will be described.

  Specifically, in the light shielding film 5 before curing, that is, in the photocurable resin and the light shielding particles (hereinafter referred to as light shielding film resin) before curing, the light shielding property in the light shielding film resin. The results of studies on the ratio of particles, the thickness of the light shielding film resin, and whether the light shielding film resin can be cured will be described.

  A urethane acrylate resin that initiates polymerization of the resin with light having a wavelength of 365 nm was used as the base UV curable resin, and carbon black fine particles were used as the light-shielding particles dispersed therein.

The weight% of the carbon black fine particles with respect to the ultraviolet curable resin used as the base was 10% by weight in condition 1, 20% by weight in condition 2, and 30% by weight in condition 3. The table shown in FIG. 3 shows whether the resin for light shielding film can be cured or not when the film thickness of the resin for light shielding film is 20 μm, 50 μm, and 100 μm under each weight% condition. Indicates that the film has been cured, and “x” indicates the occurrence of defective film formation due to uncured resin. For curing the resin for the light shielding film, the ultraviolet irradiation intensity with a central wavelength of 365 nm was 100 mJ / cm ² and the irradiation time was 30 seconds.

  As a matter of course, it can be seen from the results of FIG. 3 that when the proportion of the carbon black fine particles increases, the transmittance of ultraviolet light for curing the resin decreases, so that it becomes difficult to form a thick film.

  4 to 6 are graphs showing the transmittance of each wavelength under the respective weight% conditions in which the light shielding film 5 can be formed. FIG. 4 shows the transmittance of each wavelength when the film thickness is 20 μm under Condition 1 (10 wt%), and FIG. 5 shows the transmittance of each wavelength when the film thickness is 50 μm under Condition 2 (10 wt%). FIG. 6 shows the transmittance of each wavelength when the film thickness is 20 μm under Condition 2 (20 wt%).

  Accordingly, when the proportion of the carbon black fine particles was reduced (FIGS. 4 and 5), the light shielding effect was obtained by increasing the film thickness. On the other hand, when the proportion of the carbon black fine particles was increased (FIG. 6), a sufficient light shielding effect was obtained even if the film thickness was reduced.

  As described above, in order to cure the light shielding film resin, it is necessary to sufficiently transmit light having a resin curing wavelength with respect to a predetermined thickness. To increase the thickness, the ratio of carbon black fine particles to be contained ( In this case, in order to reduce the weight%) and reduce the thickness, the proportion of the carbon black fine particles may be increased.

  The thickness of the light shielding film 5 (that is, the thickness of the resin for the light shielding film) in a state before the photocurable resin is cured is 5 μm to 100 μm, and the resin for the light shielding film corresponding to this thickness range is selected. In order to form, it is sufficient to contain 5% by weight to 30% by weight of light-shielding particles. Hereinafter, a composite type lens having the light shielding film 5 was manufactured using a resin for the light shielding film satisfying this condition.

  FIG. 7 is a longitudinal sectional view of a manufacturing apparatus used for manufacturing the compound lens of the present invention. This manufacturing apparatus includes a base frame 30 having a cylindrical shape. The base frame 30 has a lower portion 30a extending in the cylindrical inner diameter direction and a side portion 30b extending in the cylindrical axial direction. The lower portion 30a is provided with a daylighting hole for curing the photocurable resin.

  A spring member 31 is disposed so as to contact the lower portion 30a of the base frame 30, and the glass lens 1 as a lens base material is fitted and held on the base frame upper surface 30c side of the spring member 31. A lens substrate holding member 32 is disposed. In general, the lens base member holding member 32 is designed so as to be at the same position as the base frame upper surface 30 c by the action of the spring member 31. A fixing screw 33 for fixing the lens substrate holding member 32 is disposed on the side surface 30b.

  The manufacturing apparatus includes a resin lens mold 34, a pressing guide member 35, and a light shielding film mold 36.

  The resin lens mold 34 has a transfer surface for transferring a predetermined shape to an energy curable resin for resin lens molding applied to one surface of the glass lens 1.

  The pressing guide member 35 presses the glass lens 1 against the lens base member holding member 32 and the resin lens molding so that the optical axis of the glass lens 1 coincides with the optical axis of the resin lens molding die 34. Guide the mold 34.

  The light-shielding film forming die 36 forms the light-shielding film 5 by spreading and coating the light-shielding film-forming resin on the non-optically effective surface of the glass lens 1.

  The inner diameter 301 of the base frame 30, the outer diameter 351 of the pressing guide member 35, the outer diameter 361 of the light shielding film forming die 36, and the outer diameter of the lens substrate holding member 32 are substantially equal in size.

  The outer diameter 341 of the resin lens molding die 34, the inner diameter 352 of the pressing guide member 35, and the inner diameter 362 of the light shielding film molding die 36 are substantially equal in size.

  The lens substrate holding member 32 has a stepped portion 320 having an enlarged diameter on the inner surface on one end side. The pressing guide member 35 has a stepped portion 350 having an enlarged diameter on the inner surface on one end side. The light shielding film forming die 36 has a stepped portion 360 having an enlarged diameter on the inner surface on one end side.

  When the lens base material holding member 32, the resin lens molding die 34, the pressing guide member 35 or the light shielding film molding die 36 are assembled to the base frame 30, the center axis of the base frame 30 is The central axis of the lens substrate holding member 32, the central axis of the resin lens molding die 34, and the central axis of the pressing guide member 35 or the light shielding film molding die 36 substantially coincide with each other.

  The inner diameter of the stepped portion 320 of the lens substrate holding member 32, the inner diameter of the stepped portion 350 of the pressing guide member 35, and the outer diameter of the glass lens 1 are substantially equal in size, and the lens The central axis of the base material holding member 32, the central axis of the pressing guide member 35, and the central axis of the glass lens 1 are configured to substantially coincide with each other. That is, the glass lens 1 is held by the stepped portion 320 of the lens substrate holding member 32 and the stepped portion 350 of the pressing guide member 35. Therefore, the optical axis of the glass lens 1 and the optical axis of the resin lens 2 can be substantially matched.

  The operation of this manufacturing apparatus and the method for manufacturing a compound lens will be described with reference to FIGS. 8A to 8H.

  As shown in FIG. 8A, the lens base member holding member 32 is at the same height as the upper surface 30 c of the base frame 30 by the action of the spring member 31, and the glass lens 1 can be easily placed thereon. It is like that.

  Then, as shown in FIG. 8B, the glass lens 1 having a surface treated with a silane coupling agent is applied to the stepped portion 320 of the lens substrate holding member 32, and the spherical surface 11 of the glass lens 1 is used as the upper surface. Place. An ultraviolet curable resin 40 serving as a light shielding film resin is dropped on the substantially center of the spherical surface 11 of the glass lens 1.

  Thereafter, as shown in FIG. 8C, the stepped portion 350 of the pressing guide member 35 is fitted to the outer peripheral surface of the glass lens 1 from the spherical surface 11 side of the glass lens 1, and the pressing guide member 35 is moved. The base frame 30 is pushed downward.

  Then, after the lens base material holding member 32 is pushed to a predetermined position, the fixing screw 33 is tightened until it abuts against the side portion of the lens base material holding member 32, and the lens base material holding member 32 is fixed. Fix it.

  In addition, in order to fix the said lens base material holding member 32, the example of 1 point fixing by the fixing screw 33 is shown, However, Not only this but 2 point fixing may be sufficient and 3 point fixing may be sufficient. Further, the ultraviolet curable resin 40 was dropped immediately after the glass lens 1 was placed on the lens base material holding member 32, but the lens base material holding member 32 was fixed to the base frame 30 by the pressing guide member 35. The ultraviolet curable resin 40 may be dropped after the lens base member holding member 32 is fixed by pushing it to the position, and the order of dropping the ultraviolet curable resin 40 is not particularly limited.

  Thereafter, as shown in FIG. 8D, the resin lens molding die 34 is inserted into the pressing guide member 35, and the resin lens molding die 34 is gradually pushed in, so that the ultraviolet curable resin 40 is made of glass. When the surface of the lens 1 is uniformly expanded on the spherical surface 11 and the thickness of the ultraviolet curable resin 40 reaches a predetermined thickness, the pressing of the resin lens mold 34 is stopped.

  Here, the predetermined thickness of the UV curable resin 40 takes into account the amount of curing shrinkage of the UV curable resin 40, [center thickness] of the UV curable resin 40 × (1+ [curing shrinkage rate of resin used]). To. In this state, ultraviolet rays are irradiated from the glass lens 1 side by an unillustrated ultraviolet irradiation light source to cure the ultraviolet curable resin 40.

  After the ultraviolet curable resin 40 is cured to form the resin lens 2, only the pressing guide member 35 is extracted upward, and as shown in FIG. 8E, the light shielding film resin 41 is removed from the glass lens 1. Apply to the peripheral surface corresponding to the effective optical diameter.

  The light shielding film resin 41 is constituted by containing particles having a light shielding effect in a photocurable resin. Examples of the particles having a light shielding effect include black pigments such as carbon black and aniline black. Since a photocurable resin is used for the base of the light shielding film resin 41, the light shielding film resin 41 and the silane coupling agent applied to the peripheral surface of the glass lens 1 have good adhesion.

  Thereafter, the light shielding film molding die 36 is inserted between the base frame 30 and the resin lens molding die 34, and the light shielding film resin 41 is placed on the glass by the stepped portion 360 of the light shielding film molding die 36. The lens 1 is expanded outside the effective diameter.

  At this time, the resin lens mold 34 and the resin lens 2 molded on the glass lens 1 are not released and are in close contact with each other. The light shielding film resin 41 does not enter the surface. In this state, the light shielding film 5 is formed by irradiating ultraviolet light from the glass lens 1 side with an ultraviolet light source (not shown) to cure the light shielding film resin 41. Since the light shielding film resin 41 based on the ultraviolet curable resin is thinly extended, it can be cured by irradiating with ultraviolet rays.

  Thereafter, as shown in FIG. 8G, the resin lens 2 and the light shielding film 5 are separated from the resin lens molding die 34 and the light shielding film molding die 36, so that the composite optical lens having the light shielding film 5 is obtained. Can be produced. In addition, in order to perform mold release satisfactorily, the resin lens mold 34 and the light shielding film mold 36 may be treated in advance with a mold release agent mainly composed of fluorine or silicone.

  Then, by rotating the fixing screw 33 in the loosening direction to release the fixing of the lens base member holding member 32, the composite optical lens has the same degree as the upper surface 30c of the base frame 30 as shown in FIG. 8H. It is pushed out into position and can be easily removed.

  Thereafter, an anti-reflection film forming step of forming an anti-reflection film (not shown) on the surface of the resin lens 2 is completed to complete a composite lens having the anti-reflection film 4 as shown in FIG.

  In short, the composite lens manufacturing method includes an energy curable resin coating process, a shape transfer process, a resin lens molding process, a light shielding film molding process, and a mold release process.

  In the energy curable resin application step, an energy curable resin for molding a resin lens (that is, the ultraviolet curable resin 40) is applied to one surface of the glass lens 1.

  In the shape transfer step, the resin lens mold 34 having a predetermined shape is brought into close contact with the energy curable resin.

  In the resin lens molding step, the resin lens 2 is molded by applying predetermined energy to the energy curable resin and curing the energy curable resin.

  In the light shielding film molding step, the light shielding film molding resin (that is, the light shielding film resin 41) is coated on the non-optically effective surface of the glass lens 1 and cured to mold the light shielding film 5.

  In the mold release step, the resin lens 2 is released from the resin lens mold 34.

  The said light shielding film shaping | molding process is performed before the said mold release process. In the light shielding film forming step, the light curable resin in which the light shielding particles are dispersed is irradiated with light and cured to form the light shielding film 5, and the light shielding film 5 is separated from the light shielding film molding die 36. Molding.

  According to the composite lens having the above-described configuration, the light-shielding film 5 provided on the non-optically effective surface of the glass lens 1 includes the photocurable resin as the energy curable resin. It is not necessary to perform the process twice, so that the productivity is excellent, and the adhesion between the light shielding film 5 and the glass lens 1 is enhanced, thereby improving the reliability.

  Further, since the light shielding film 5 includes the photocurable resin and the light shielding particles, the adhesion between the light shielding film 5 and the silane coupling agent 3 applied to the peripheral surface of the glass lens 1 is good. become.

  In addition, since the ratio of the light-shielding particles to the light-curable resin and the light-shielding particles is 5% by weight to 30% by weight, the photocurable resin can be reliably cured by light and has a light shielding effect. The light shielding film 5 can be reliably formed. On the other hand, when the proportion of the light shielding particles is less than 5% by weight, the light shielding effect of the light shielding film 5 is reduced. On the other hand, when the proportion of the light shielding particles is more than 30% by weight, the photocuring is performed. The light transmittance to the functional resin is lowered, and the light shielding film 5 cannot be formed.

  Moreover, since the thickness of the light-shielding film 5 in a state before the photocurable resin is cured is 5 μm to 100 μm, the light-curable resin can be reliably cured by light and has the light-shielding effect. The film 5 can be reliably formed. On the other hand, when the thickness of the light shielding film 5 is smaller than 5 μm, the light shielding effect of the light shielding film 5 is reduced. On the other hand, when the thickness of the light shielding film 5 is larger than 100 μm, The light transmittance is lowered, and the light shielding film 5 cannot be formed.

  According to the method of manufacturing a composite lens having the above configuration, the energy curable resin coating step, the shape transfer step, the resin lens molding step, the light shielding film molding step, and the mold release step are provided. In addition, it is not necessary to perform the sacrificing process twice as in the prior art, and the productivity of the composite lens is excellent, and the adhesion between the light shielding film 5 and the glass lens 1 is enhanced, thereby improving the reliability of the composite lens. Will improve.

  In addition, since the light shielding film molding step is performed before the mold release step, the resin for molding the light shielding film (the resin 41 for the light shielding film) is obtained in a state where the resin lens molding die 34 is in close contact with the resin lens 2. ) And the resin for forming the light shielding film does not enter the optical effective diameter of the resin lens 2.

  Further, the light shielding film forming step includes a step of forming the light shielding film 5 by irradiating the photocurable resin with light and curing, and a step of releasing the light shielding film 5 from the light shielding film molding die 36. Therefore, the light-shielding film 5 can be reliably formed with a mold.

  According to the composite lens manufacturing apparatus having the above configuration, the resin lens molding die 34, the lens base material holding member 32, the pressing guide member 35, and the light shielding film molding die 36 are provided. Thus, it is not necessary to perform the saking process twice, so that the productivity of the composite lens is excellent, and the adhesion between the light-shielding film 5 and the glass lens 1 is improved, thereby improving the reliability of the composite lens. .

  In short, in the present invention, the silane coupling agent 3 is applied to at least the non-optically effective surface of the composite lens in which the glass lens 1 and the resin lens 2 are joined by the silane coupling agent 3, and this lens is ineffective. On the surface, the light shielding film 5 based on the energy curable resin is formed on the surface of the silane coupling agent 3.

  For this reason, the occurrence of flare and ghost due to abnormal reflection in the lens barrel of the lens optical system built in the lens barrel is prevented, and the glass lens 1 and the light shielding film 5 are adhered to each other by the silane coupling agent 3. Therefore, a highly reliable composite lens can be configured. Moreover, according to this invention, since the penetration of the light shielding film 5 to the optically effective surface of the resin lens 2 can be suppressed and the light shielding film 5 can be coated in a series of manufacturing processes of the composite lens, it is excellent in mass productivity. This makes it possible to manufacture composite lenses.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, the lens used as the lens substrate may be a lens made of plastic in addition to glass. The lens used as the lens substrate is not limited to a concave lens, and may be a convex lens. The resin lens 2 may be provided on at least one surface of the glass lens 1.

It is sectional drawing which shows one Embodiment of the compound type lens of this invention. It is a principal part enlarged view of FIG. 6 is a table for explaining the relationship between the ratio of light-shielding particles in the light-shielding film resin, the thickness of the light-shielding film resin, and whether the light-shielding film resin can be cured. It is a graph showing the transmittance | permeability of each wavelength when the ratio of the light shielding particle in resin for light shielding films is 10 weight%, and the thickness of resin for light shielding films is 20 micrometers. It is a graph showing the transmittance | permeability of each wavelength when the ratio of the light shielding particle in resin for light shielding films is 10 weight%, and the thickness of resin for light shielding films is 50 micrometers. It is a graph showing the transmittance | permeability of each wavelength when the ratio of the light-shielding particle | grains in resin for light shielding films is 20 weight%, and the thickness of resin for light shielding films is 20 micrometers. It is a schematic diagram which shows the structure of the manufacturing apparatus which manufactures the compound type lens of this invention. It is a 1st process drawing which shows the manufacturing method of the compound type lens of this invention. It is a 2nd process figure which shows the manufacturing method of the compound type lens of this invention. It is a 3rd process drawing which shows the manufacturing method of the compound type lens of this invention. It is a 4th process drawing which shows the manufacturing method of the compound type lens of this invention. It is a 5th process figure showing the manufacturing method of the compound type lens of the present invention. It is a 6th process figure showing the manufacturing method of the compound type lens of the present invention. It is a 7th process figure showing a manufacturing method of a compound type lens of the present invention. It is an 8th process figure which shows the manufacturing method of the compound type lens of this invention. It is sectional drawing which shows the conventional compound type lens.

Explanation of symbols

1 Glass lens (lens substrate)
DESCRIPTION OF SYMBOLS 2 Resin lens 3 Silane coupling agent 4 Antireflection film 5 Light shielding film 30 Base frame 31 Spring member 32 Lens base material holding member 33 Fixing screw 34 Resin lens molding die 35 Pressing guide member 36 Light shielding film molding die 40 UV curable resin 41 Light shielding Membrane resin

Claims (8)

A lens substrate;
A resin lens provided on at least one surface of the lens substrate;
A light-shielding film provided on the non-optically effective surface of the lens substrate,
The light shielding film includes an energy curable resin, and is a composite optical element. The composite optical element according to claim 1,
The light shielding film is
A photocurable resin;
A composite optical element comprising light shielding particles dispersed in the photocurable resin. The composite optical element according to claim 2,
The composite optical element according to claim 1, wherein a ratio of the light-shielding particles to the photocurable resin and the light-shielding particles is 5% by weight to 30% by weight. The composite optical element according to claim 2,
The composite optical element according to claim 1, wherein a thickness of the light shielding film in a state before the photocurable resin is cured is 5 μm to 100 μm. An energy curable resin application step of applying an energy curable resin for resin lens molding to at least one surface of the lens substrate;
A shape transfer step of closely attaching a resin lens mold of a predetermined shape to the energy curable resin;
A resin lens molding step of applying a predetermined energy to the energy curable resin, curing the energy curable resin, and molding a resin lens;
A light-shielding film molding step in which a non-optically effective surface of the lens base material is coated with a resin for light-shielding film molding and cured to form a light-shielding film;
A method of manufacturing a composite optical element, comprising: a mold release step of releasing the resin lens from the resin lens mold. In the manufacturing method of the composite type optical element according to claim 5,
The method for producing a composite optical element, wherein the light shielding film forming step is performed before the mold releasing step. In the manufacturing method of the composite type optical element according to claim 5,
The light shielding film forming step includes:
Irradiating and curing the light curable resin in which the light shielding particles are dispersed to form the light shielding film; and
And a step of releasing the light shielding film from the light shielding film molding die. A resin lens mold having a transfer surface for transferring a predetermined shape to an energy curable resin for resin lens molding applied to at least one surface of the lens substrate;
A lens substrate holding member for holding the lens substrate;
A pressing guide member that guides the resin lens mold so that the optical axis of the lens base and the optical axis of the resin lens mold coincide with each other while pressing the lens base against the lens base holding member;
An apparatus for manufacturing a composite optical element, comprising: a light-shielding film forming die for forming a light-shielding film by spreading and coating a resin for light-shielding film on the non-optically effective surface of the lens base material.

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