JP4612837B2 - Lens fixing method and optical apparatus - Google Patents

Description

  The present invention relates to a lens fixing method for fixing lenses to each other and an optical apparatus having a plurality of lenses fixed to each other by the method.

  Conventionally, there are the following techniques related to this type of lens fixing.

  (1) After the first lens is inserted into the plastic lens barrel and the second lens is further inserted, the outer peripheral side surface of the second lens is brought into contact with the first lens outer peripheral side surface, and thereafter A method is known in which a piece of the tip of the lens barrel is deformed and fixed by a method such as thermal caulking.

  (2) Aside from that, a method of fixing the lens outer peripheral portion and the lens frame with an ultraviolet curable adhesive or the like is known.

  (3) Also, as a method of fixing the assembly of lenses that are optical members, the optical axes of the first lens and the second lens are aligned with each other before being fixed in the lens barrel, and then mirrored with an adhesive. A method of fixing in a cylinder is known (Patent Document 1).

(4) Further, as a method of fixing the lens to a lens frame or the like, the lens is formed of a laser beam transmitting plastic, the lens is brought into contact with the welding surface of the lens frame formed of the laser beam absorbing plastic, and the laser is passed through the lens. There is known a method of irradiating and fixing light onto a welding surface of a lens frame (Patent Document 2).
Japanese Patent Laid-Open No. 11-344657 JP 2004-20867 A

  However, the above-described conventional example has the following problems.

  (1) Since the lens barrel is melted by heat with a caulking jig so as to cover the tip of the outer periphery of the lens, the time required for caulking becomes longer, the number of assembling steps increases, and there is a problem of increasing costs. In addition, since it is necessary to melt and fix the outer periphery of the lens holding member with heat with a caulking jig, a pressing force is applied to the lens holding member and the lens, which makes it difficult to guarantee the accuracy of the lens position after assembly. (Recent lens groups that have been miniaturized in recent years are extremely sensitive to performance variations caused by decentering and tilting with respect to the optical axis, that is, performance degradation, and therefore, lens miniaturization advances. Under the circumstances, it is difficult to mass-produce high-performance zoom lenses with the conventional assembly method).

  (2) In the method of fixing the lens holding member and the outer periphery of the lens with the ultraviolet curable adhesive, the liquid adhesive is applied to the lens holding member after the ultraviolet curable adhesive is applied and before the ultraviolet rays are irradiated. When it flows out to the outer peripheral surface and is cured by irradiation with ultraviolet rays, there is a problem that interference with surrounding parts occurs after assembling, resulting in a malfunction and particularly deterioration of optical performance. Further, there is a problem that the liquid adhesive flows into the lens through a gap between the lens holding member and the lens outer peripheral portion, interrupts the optical path, and cannot guarantee the lens optical performance. In addition, when the ultraviolet curable adhesive is solidified, non-uniform shrinkage occurs, and the lens is displaced and fixed from the lens position before the start of adhesion, and the optical performance may be deteriorated. In the conventional example, it is necessary to apply a light shielding agent to the outer peripheral surface of the lens in order to block light other than the effective light beam such as stray light.

  (3) According to the conventional method described above, the optical axis of the non-bonded lens and the cemented lens are fixed and fixed before being fixed in the lens barrel. Since there is a step on the side surface of at least one of the two, there is an advantage that the adhesive enters the step and does not protrude onto the polished surface, but the bonded lens and the non-bonded lens are bonded with ultraviolet curing. After bonding with an adhesive such as an adhesive, the time required for fixing the light-shielding agent or the adhesive is increased, and the number of assembling steps increases, resulting in an increase in cost. . Further, in the adhesion of a glass lens using an ultraviolet curable adhesive, the lens may be peeled off due to the difference in the linear expansion coefficient between the ultraviolet curable adhesive and the glass.

  (4) When fixing between lenses, it is difficult to form the welding surface by a laser beam on a lens.

(Object of invention)
An object of the present invention is to provide a lens fixing method and an optical apparatus that can fix lenses with high accuracy and space-saving.

In order to achieve the above object, the lens fixing method of the present invention is a lens fixing method for fixing a second lens to a first lens, which generates heat when irradiated with light and a material that generates heat. light intermediate member containing a material to increase the adhesion, the first portion of the first positioning step and said intermediate member positioned in said first lens to be positioned relative to the first lens in And positioning the second lens with respect to the first lens so that the intermediate member is positioned between the first lens and the second lens. It has a 2nd positioning step and a 2nd irradiation step which irradiates light to the 2nd part different from the said 1st part of the said intermediate member, It is characterized by the above-mentioned.

  According to the present invention, the lenses can be fixed with high accuracy and in a small space, and the lens frame can be reduced in size.

  The best mode for carrying out the present invention is as described in Examples 1 to 5 described later.

  FIG. 1 is a cross-sectional perspective view of a main part showing constituent members used in a lens fixing method that is Embodiment 1 of the present invention.

10 and 12 are optical glass lenses, and 11 is an intermediate member of a sheet material formed in a circular shape interposed between the light incident and exit surfaces of the lenses 10 and 12 when assembled. The intermediate member 11 is made of a material that blocks visible light, and also serves as an optical aperture function that has a function of blocking harmful harmful light from peripheral parts other than photographing light and components outside the figure. . The intermediate member 11 is made of a material that increases its adhesive strength when heated (for example, polyester, polyimide, polyurethane, ionomer resin, hot melt sheet mainly composed of a copolymer resin of ethylene and methacrylic acid, thermal adhesive sheet (thermosetting) The mold) is made of a material that remarkably absorbs a near-infrared laser (for example, carbon black, a predetermined colorant such as a dye or a pigment).

  FIG. 2 is a cross-sectional view of the main part showing a state in which the lens 10, the lens 12, and the intermediate member 11 are incorporated. A laser beam 13 is used to fix the lens 10 and the lens 12 by irradiating near-infrared light as described later and increasing the adhesive force of the intermediate member 11.

  The lens fixing method of the first embodiment is to fix the lens 10 and the lens 12 in the following order.

  As described above, when the lens 10 is assembled with the lens 12 via the intermediate member 11, the lens 10, 12 and the intermediate member 11 are fixed to each other with a pressing device (not shown). At this time, the lens 10 and the lens 12 that hold the intermediate member 11 are restricted in position in the direction perpendicular to the optical axis by a positioning adjustment frame (not shown) at the outer peripheral end portion thereof. Therefore, the intermediate member 11 is positioned without intervening within the effective diameters of the lens 10 and the lens 12. In this state, a spot-like laser beam 13 is incident from a light incident / exit surface of the lens 12 from a laser irradiation device (not shown), is transmitted through the lens 12, and is irradiated onto the intermediate member 11. The intermediate member 11 is made of a material that absorbs near-infrared light as described above, and is made of a member that increases the adhesive force when heat is applied. Therefore, when the laser beam 13 is absorbed, the intermediate member 11 instantly Adhesive strength increases. At this time, the intermediate member 11 is bonded and fixed to the lenses 10 and 12. Note that after a predetermined irradiation time, the laser irradiation is terminated, and the lens fixing step is completed.

  As described above, since the lenses 10 and 12 are directly fixed by heating the intermediate member 11, the lenses 10 and 12 can be fixed with high accuracy and space saving. And the lens frame which supports these lenses 10 and 12 can be reduced in size.

  The contact portion of the intermediate member 11, the lens 10, and the lens 12 releases the pressing of the lens 10 and the intermediate member 11 of the lens 12 by a pressing device (not shown), and even if the positioning adjustment frame (not shown) is removed, Since the lens 10 and the lens 12 are always fixed by the adhesive force, the lens 10 and the lens 12 are positioned with high accuracy without any backlash. Further, when a strong impact is applied, the intermediate member 11 is elastically deformed to absorb the impact and to prevent the lenses 10 and 12 from cracking. The two lenses 10 and 12 are fixed to the intermediate member 11 in the adjustment position state.

  In Embodiment 1 described above, the lenses 10 and 12 and the intermediate member 11 have been described as being configured to receive laser irradiation in a state where they are simply assembled. For example, the lens 10 is held by a vacuum suction tool or the like. Needless to say, the positioning adjustment of the intermediate member 11 and the eccentricity and inclination adjustment of the lens 12 can be performed, and the laser irradiation can be performed after the adjustment while maintaining the state.

  In addition, although the laser irradiation is configured to be performed at a plurality of spots in a spot shape, the irradiation spot is not limited to this, and the laser beam 13 matched to the shape of the intermediate member 11 may be irradiated.

  Moreover, when irradiating a spot-like laser beam to several places, it is preferable to irradiate with the equal position space | interval on the intermediate member 11. FIG. When the shape of the intermediate member 11 is not a ring shape such as a barrel shape, the irradiation positions may not be evenly spaced, such as irradiating the intermediate position of each side. At this time, each spot position is preferably arranged on a circumference of a circle centered on the optical axis.

  In addition, the laser beam irradiation may be performed at a plurality of spots at the same time. When simultaneous irradiation is not performed, spot irradiation may be performed sequentially in a diagonal arrangement.

  Further, for example, after performing simultaneous irradiation at three locations (positions of 120 degrees each) equally and then rotating the laser clockwise by 60 degrees clockwise or counterclockwise to fix a total of six positions, etc. 12 or the laser irradiation position may be rotated for fixing.

  In addition, the laser irradiation angle may be set so that the surface of the intermediate member 11 is irradiated vertically, or the irradiation may be performed from other directions without being limited to the vertical direction.

  In addition, the laser beams for irradiating a plurality of locations at the same time are not exactly the same, but are irradiated with a time difference that does not affect the positional accuracy of the lenses 10 and 12, for example, a time difference of several tens to several hundreds of ms. May be.

  In addition, regarding the lens described above, it goes without saying that a lens made of a glass material or a lens made of a resin material is not contrary to the intention of the present invention.

  Further, regarding the above-described lens fixing method, since the lens is fixed on the light incident / exit surface, the accuracy of the outer diameter of the lens is not required. Therefore, the lens may not be a centering process. The centering process is to finish the outer diameter of the lens by matching the center of curvature of the lens with the center of the outer shape of the lens.

  Therefore, when the lens and the lens frame are fixed using the lens fixing method of the present embodiment, it is not necessary to fix the lens frame with the outer diameter of the lens. The lens frame can be downsized.

  Further, regarding the fixing of the lens frame and the lens (not shown), the fixing may be performed using a conventional method, or the fixing of the lens frame and the lens may be performed via an intermediate member using the method of the present invention. You can go.

  Further, after fixing the lenses by the method of the present invention, the lens may be attached to the lens holding member, or after attaching one lens to the lens holding member, the other lens may be attached.

  In the lens fixing method of the above-described embodiment, the intermediate member 11 is formed in a sheet shape having a thickness of several μm to several tens of μm, and is not easily affected by accuracy.

  Further, since the melting point of the intermediate member 11 is sufficiently lower than the melting points of the lens 10 and the lens 12, the lens 10 and the lens 12 are not affected by the laser irradiation.

  In the above embodiment, the positioning of the lens 10 and the lens 12 is defined by surface contact via the intermediate member 11, but the present invention is not limited to this, and the positioning may be line contact or point contact. Needless to say.

  FIG. 3 is a cross-sectional perspective view of a main part showing constituent members used in the lens fixing method that is Embodiment 2 of the present invention, and FIG. 4 is a cross-sectional view showing a state in which the lens and the intermediate member are incorporated.

  The second embodiment is characterized in that the same structural members as those of the first embodiment are used, and the surface shape is formed on the intermediate member 31 along the curvature of the light incident / exit surfaces of the lens 30 and the lens 32. For example, the intermediate member 31 is formed by punching a flat sheet in a circumferential shape and then forming it so as to conform to the curvature of the light incident / exit surfaces of the lens 30 and the lens 32. It is formed so as to adhere to the emission surface without following wrinkles following the shape.

  Since the lens fixing method of the second embodiment is almost the same as that of the first embodiment, the description thereof is omitted.

  As described above, the surface of the intermediate member 31 that is in contact with the lens 30 and the lens 32 is formed as a surface shape along the light incident / exit surface of the lens 30 and the lens 32. Therefore, the intermediate member 31 is formed as shown in FIG. Contact between the lens 30 and the lens 32 is facilitated.

  In the second embodiment, the sheet-like member forming the intermediate member 31 is punched and then formed to form a surface shape that follows the curvature of the light incident / exit surface of the lens. However, the shape of the intermediate member 31 may be formed by other methods in order to obtain the same effect.

  Further, as an example, it is possible to fix a combination of lenses as shown in FIG. 5 by forming the intermediate member 31 in accordance with the lens shape to be fixed. 5A is a cross-sectional view of the main part showing a state where the concave lens 50 and the concave lens 52 are fixed by the intermediate member 51, and FIG. 5B is a main part showing a state where the convex lens 53 and the convex lens 55 are fixed by the intermediate member 54. FIG. 5C is a partial cross-sectional view showing a state in which a concave lens 56 and a convex lens 58 having different curvatures are fixed by an intermediate member 57.

  For example, as shown in FIG. 5A, the case where the concave lens 50 and the concave lens 52 are fixed will be described. Since the intermediate member 51 has a surface in contact with the lens 50 and the lens 52 having a surface shape that follows the curvature of the lens light incident / exit surface, the intermediate member 51 can be easily adhered to the lens 50 and the lens 52. Similarly, when fixing the convex lens 53 and the convex lens 55 as shown in FIG. 5B, or when fixing the concave lens 56 and the convex lens 58 having different curvatures as shown in FIG. Since the members 54 and 57 form a surface shape along the lens light incident / exit surface, the intermediate member and the lens can be easily adhered to each other.

  Needless to say, the intermediate member may be formed in another shape in order to obtain the same effect.

  Further, as for the above-mentioned lens, it goes without saying that a lens made of a glass material or a lens made of a resin material is not contrary to the intention of the present invention.

  The lens described above may be a lens that has not been subjected to the centering process.

  FIG. 6 is a cross-sectional perspective view of a main part showing constituent members used in a lens fixing method that is Embodiment 3 of the present invention.

  Since the lens fixing method of the third embodiment is the same as that of the first embodiment, the description thereof is omitted.

  As shown in FIG. 7, the intermediate member 61 used in the third embodiment has notches formed on the outer peripheral portion and the inner peripheral portion thereof. Therefore, the intermediate member 61 follows the lens shape and easily adheres to the uneven lens light incident / exit surfaces of the lenses 60 and 62 without wrinkling.

  Further, in the third embodiment, the notch portions are formed in the outer peripheral portion and the inner peripheral portion of the intermediate member 61, respectively, so that the adhesion with the lens is obtained. However, the notch portions may have other shapes. Needless to say. FIG. 8 shows some examples of other notch shapes and cut shapes. FIG. 8A shows an example of a notch shape, and FIG. 8B shows an example of a cut shape.

  In addition, the lenses 60 and 62 and the intermediate member 61 may be disposed so that the entire surface is in contact with each other, or the lenses 60 and 62 and the intermediate member 61 may be disposed in contact with each other. If the thickness of the intermediate member 61 is set in accordance with the air space between the lenses, the air space between the lenses can be adjusted without using a spacer or the like.

  FIG. 9 is a cross-sectional perspective view of main parts showing components used in a lens fixing method that is Embodiment 4 of the present invention and a cross-sectional view of main parts showing a state in which the lens is fixed by an intermediate member. 9A is a view showing the lens 90, the lens 92, and the intermediate member 91, FIG. 9B is a view showing the state after the fixing, and FIG. 9C is a view showing the lens 90 using the intermediate member 93 having another shape pattern. It is a figure which shows the lens 92 after fixation.

  The fourth embodiment is characterized in that the same structural members as in the first embodiment are used, and the intermediate members 91 and 94 are formed in a shape that covers the lens 90 or the lens outer peripheral surface of the lens 90 and the lens 92.

  Since the lens fixing method of the fourth embodiment is the same as that of the first embodiment, the description thereof is omitted.

  As shown in FIG. 9A, the intermediate member 91 used in the fourth embodiment is formed in a shape along the surface shapes of the light incident / exit surfaces of the lens 90 and the lens 92, and the outer peripheral end surface of the lens 90 is formed. It is formed to cover. For this reason, as shown in FIG. 9B, the intermediate member 91 fixes the lens 90 and the lens 92 and has a light shielding function of blocking light other than the effective light beam such as stray light from the outer peripheral end surface of the lens 90. Yes.

  Further, since the intermediate member 91 has a cut shape, it follows the surface shape of the light incident / exit surfaces of the lens 90 and the lens 92 and easily adheres to an uneven lens surface without causing wrinkles.

  Further, when the lens 90 and the lens 92 are formed so as to cover the outer peripheral surfaces as in the intermediate member 93 as shown in FIG. 9C, the lens 90 and the lens 92 are fixed and the lens 90 is also fixed. And has a light blocking effect on the lens outer peripheral end surfaces of the lenses 92, and blocks stray light from the lens outer peripheral end surfaces of the lenses 90 and 92.

  FIG. 10 is a cross-sectional perspective view of a main part showing components used in a lens fixing method that is Embodiment 5 of the present invention. Reference numerals 100 and 102 denote lenses, and 101 is interposed between the lenses 100 and 102 when assembled. An intermediate member 104 formed in a ring shape indicates an outer peripheral end portion of the intermediate member 101.

  The fifth embodiment uses the same components as in the first embodiment, and is characterized in that the fixing position of the lens 100 and the intermediate member 101 is different from the fixing position of the lens 102 and the intermediate member 101.

For example, the lens 100 and the lens 102 fixed in this embodiment have different outer diameter dimensions as shown in FIG. Further, the diameter dimension of the outer peripheral end portion 104 of the intermediate member 101 is almost the same as the outer diameter dimension of the lens 102 . Therefore, the intermediate member 101 is positioned so that the outer peripheral end portion 104 thereof coincides with the outer peripheral end portion of the lens 102. FIG. 11 shows a state where the lens 100 and the lens 102 are fixed by the intermediate member 101. FIG. 11A is a view before positioning and fixing, and FIG. 11B is a view after positioning and fixing. As shown in FIG. 11A, the intermediate member 101 has a planar shape before positioning, but after positioning, the curvature of the light incident / exit surfaces of the lens 100 and the lens 102 as shown in FIG. 11B. Follow.

  In the lens fixing method of the fifth embodiment, the lens 100 and the lens 102 are fixed according to the following procedure.

  As shown in FIG. 12A, the laser beam 103 is irradiated to the positioned lens 102 and the intermediate member 101 from a laser irradiation device (not shown) as illustrated. As described above, the intermediate member 101 is formed of a member that absorbs near-infrared light, and is formed of a member that increases the adhesive force when heat is applied. Therefore, when the laser beam 103 is absorbed, the intermediate member 101 generates heat. , The adhesive force increases. Therefore, the intermediate member 101 is fixed to the lens 102 by irradiation with the laser beam 103.

  Next, as shown in FIG. 12B, the lens 100 is positioned on the fixed lens 102 and the intermediate member 101, and the lens 100, the intermediate member 101, and the lens 102 are brought into close contact with a pressing device (not shown). To do. At this time, since the intermediate member 101 is fixed to the lens 102, the intermediate member 101 does not move relative to the lens 102 during the positioning adjustment of the lens 100.

With the lens 100 positioned, the laser beam 103 is irradiated as shown in FIG. At this time, as shown in FIG. 12B, the irradiation position of the laser beam 103 is different from the irradiation position of the laser beam 103 performed in FIG. The intermediate member 101 at the site irradiated with the laser is given heat, but since the heat is given to a position different from the fixing position of the lens 102 and the intermediate member 101, the intermediate member 101 will not deviate from the fixed position. . After a predetermined irradiation time, the laser irradiation is terminated and the lens fixing step is completed.

  In the lens fixing method of the present embodiment, the lens 102 as the basic first lens and the intermediate member 101 are positioned and fixed, and then the lens 100 as the second lens is positioned and fixed. At this time, the fixing position of the first lens and the intermediate member (that is, the irradiation position of the laser beam 103) is different from the fixing position of the second lens (that is, the irradiation position of the laser beam 103). The first lens and the second lens are fixed via an intermediate member. Although the basic lens has been described as the first lens here, it goes without saying that the basic lens may be the first lens or the second lens.

  Further, the lens fixing method of the present embodiment is configured so that the fixing position of the first lens and the intermediate member and the fixing position of the second lens and the intermediate member are arranged at different positions on the same diameter. Needless to say, in order to obtain the same effect, a fixed position of another pattern may be configured.

  An example of the fixed arrangement of other patterns will be described below. FIG. 13 is a cross-sectional perspective view of a main part showing a structural member that is a modification of the fifth embodiment of the present invention, wherein 130 and 132 are lenses, and 131 is an intermediate member. Reference numeral 133 denotes a laser beam, and 134 denotes an outer peripheral end of the intermediate member 131. The outer diameter of the intermediate member 131 is approximately the same as the outer diameter of the lens 132. 14 is a cross-sectional perspective view of the main part showing the state after fixing, FIG. 14 (a) is a view showing a state where the lens 132 and the intermediate member 131 are fixed, and FIG. 14 (b) is a view showing the lens 130 and the intermediate member 131. It is a figure which shows the state by which the lens 132 was fixed.

  The lens 130 and the lens 132 are fixed according to the following procedure.

As shown in FIG. 13, the intermediate member 131 has cut portions formed in the outer peripheral portion and the inner peripheral portion of the ring-shaped sheet material. The lens 132 and the intermediate member 131 are positioned in a portion of the outer peripheral end portion 134 of the intermediate member 131 where the notch is not formed.
When the lens 132 and the intermediate member 131 positioned as shown in FIG. 14A are irradiated with the laser beam 133 on the outer peripheral portion of the intermediate member 131 where the notch is not formed, the intermediate member Heat is applied to 131, the adhesive force increases, and the lens 132 and the intermediate member 131 are fixed.

  Next, as shown in FIG. 14B, the lens 130 is positioned with respect to the fixed lens 132 and the intermediate member 131, and the lens 130, the intermediate member 131, and the lens 132 are brought into close contact with a pressing device (not shown). Put it in a state. At this time, since the intermediate member 131 is fixed to the lens 132, the intermediate member 131 does not move during the positioning adjustment of the lens 130.

The laser beam 133 is irradiated with the lens 130 positioned. At this time, as shown in FIG. 14B, the irradiation position of the laser beam 133 is a position different from the laser irradiation position performed in FIG. Irradiate the part where the notch is not formed. Although the intermediate member 131 at the site irradiated with the laser is given heat, since the heat is given to a position different from the fixing position of the lens 132 and the intermediate member 131, the intermediate member 131 does not deviate from the fixing position. After a predetermined irradiation time, the laser irradiation is terminated and the lens fixing step is completed.

  It goes without saying that the lens described above is not contrary to the intention of the present invention, whether it is a lens made of a glass material or a lens made of a resin material.

  The lens described above may be a lens that has not been subjected to the centering process.

  In the above-described five embodiments, the fixing of the optical lens related to the photographing optical system has been described. However, the present invention is not limited to this. For example, not only two lenses but also two lenses are fixed. The present invention can also be applied to the case where the above lens is fixed. Further, it is needless to say that any embodiment may be used as long as it is different from the above five embodiments as long as it conforms to the content of the claims.

It is a principal part cross-section perspective view which shows the structural member used for the lens fixing method which is Example 1 of this invention. It is principal part sectional drawing which shows the state by which the lens was fixed by the intermediate member of FIG. It is a principal part cross-sectional perspective view which shows the structural member used for the lens fixing method which is Example 2 of this invention. It is principal part sectional drawing which shows the state by which the lens was fixed by the intermediate member of FIG. FIG. 10 is a cross-sectional view of a main part showing examples of various shapes of an intermediate member used in Example 2. It is a principal part cross-sectional perspective view which shows the structural member used for the lens fixing method which is Example 3 of this invention. 6 is a plan view showing an example of the shape of an intermediate member used in Example 3. FIG. 10 is a plan view showing an example of the shape of another intermediate member used in Example 3. FIG. It is principal part sectional perspective view which shows the structural member used for the lens fixing method which is Example 4 of this invention, and principal part sectional drawing which shows the state by which the lens was fixed by the intermediate member. It is a principal part cross-section perspective view which shows the structural member used for the lens fixing method which is Example 5 of this invention. It is principal part sectional drawing which respectively shows the state before and after lens fixation by the intermediate member of FIG. It is a principal part cross-sectional perspective view which shows the lens fixing method in the case of the structural member shown by FIG. It is principal part sectional perspective view which shows the structural member at the time of using the intermediate member of a different shape in the lens fixing method which is Example 5 of this invention. It is a principal part cross-section perspective view which shows the lens fixing method in the case of the structural member shown by FIG.

Explanation of symbols

10, 12, 30, 32, 50, 52,
53, 55, 56, 58, 60, 62,
90, 92, 100, 102, 130, 132 Lenses 11, 31, 51, 54, 57, 61, 81,
82, 91, 101, 131 Intermediate member 13, 103, 133 Laser light

Claims (4)

A lens fixing method for fixing a second lens to a first lens,
A first positioning step for positioning an intermediate member that includes a material that generates heat when irradiated with light and a material that increases adhesive force by generating heat;
A first irradiation step of irradiating light to a first portion of the intermediate member positioned on the first lens;
A second positioning step of positioning the second lens with respect to the first lens such that the intermediate member is positioned between the first lens and the second lens;
And a second irradiation step of irradiating light to a second portion different from the first portion of the intermediate member.   2. The intermediate member according to claim 1, wherein the intermediate member is a member formed in a three-dimensional shape so as to conform to the surface shapes of the light incident / exit surface of the first lens and the light incident / exit surface of the second lens. The lens fixing method as described.   The lens fixing method according to claim 2, wherein the intermediate member is a ring-shaped sheet material in which at least one notch is formed.   The lens fixing method according to any one of claims 1 to 3, wherein the light applied to the intermediate member is laser light including an infrared component.

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