JP2010243566A - Adhesion fixing method and method of fixing optical element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesion fixing method for being accurately and firmly fixed with an adhesive. <P>SOLUTION: The adhesion fixing method fixes a first member and a second member, by using an epoxy adhesive and an acrylic adhesive; concerning the first member and the second member, a part for adhering and fixing at least the first member and the second member is made of a material in which adhesion force due to the acrylic adhesive is larger than adhesion force due to the epoxy adhesive; the adhesion fixing method includes: a process for applying the epoxy adhesive between the first member and the second member; a first curing process for curing the epoxy adhesive; a process for applying the acrylic adhesive so as to fix the first member and the second member; and a second curing process for curing the acrylic adhesive. The first curing process is performed prior to the second curing process. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an adhesive fixing method and an optical element fixing method.

  For optical components or between optical components and image sensor, adjust the distance, inclination (tilt eccentricity), parallel shift (parallel eccentricity) between the two components, and maintain these positioned states within the allowable error range. It is necessary to fix both. As a fixing method after such positioning, an adhesive may be used. The fixing method using an adhesive is, for example, if two parts are provided with a gap so that they can be moved freely within the range necessary for adjustment, and the two parts are fixed after adjustment. Each adjustment of the parallel shift can be easily performed.

  As described above, the fixing method by bonding has a high degree of freedom in moving parts during adjustment. On the other hand, as an adhesive characteristic, an epoxy adhesive is used as an example. Due to shrinkage (time-dependent change) that occurs as time elapses due to curing that continues after irradiation, the relative position between the two parts that have been positioned and adjusted may shift, and depending on the material of the part, the adhesive strength may not be sufficient. There is a case. For this reason, in the conventional method of fixing optical components using an adhesive, the relative position after adjustment is maintained within a range where sufficient optical performance can be obtained, and it can be sufficiently satisfied that the optical component is firmly fixed. There was a case where it did not reach to the extent.

  Patent Document 1 discloses a method in which a first component member and a second component member are positioned via an air layer and bonded as they are or via a third component member.

  In Patent Document 2, the adhesive fixing portion when fixing the glass substrate to the spacer has a first adhesive portion made of a high elastic adhesive and a second adhesive portion made of a low elastic adhesive, A method is disclosed in which the elastic adhesive fixes the four corners of the glass substrate, and the low elastic adhesive seals the outside of the high elastic adhesive.

JP 2002-356006 A JP 2004-133073 A

  However, in the bonding method disclosed in Patent Document 1, the adhesive layer is thinned to suppress the curing shrinkage displacement and fix the position between the two members with high accuracy. In order to reduce the thickness of the adhesive layer, it is necessary to narrow the interval between the components, and adjustment in the direction in which the components are closer to each other may not be possible due to interference between the components. In order not to cause interference between parts, it is necessary to increase the precision of the parts, both in the case where the third constituent member is interposed between the two parts and in the case where the third constituent member is not interposed, and the manufacturing cost is increased. . Even if the adhesive layer is thin, the adhesive shrinks during curing, and the positional deviation cannot be sufficiently suppressed.

  In the bonding method disclosed in Patent Document 2, it is necessary to completely cure the high-elasticity adhesive, and an epoxy-based adhesive is cited as an example of the high-elasticity adhesive. Since it takes a long time to completely cure the epoxy adhesive, the production efficiency is lowered. In addition, the epoxy adhesive may not provide a sufficient adhesive force to the plastic member.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an adhesive fixing method that can be accurately and firmly fixed with an adhesive.

  Said subject is solved by the following structures.

1. An adhesive fixing method for fixing the first member and the second member using an epoxy adhesive and an acrylic adhesive,
The first member and the second member are materials in which at least a portion where the first member and the second member are bonded and fixed has an adhesive force by the acrylic adhesive larger than an adhesive force by the epoxy adhesive Consists of
Applying the epoxy adhesive between the first member and the second member;
A first curing step for curing the epoxy adhesive;
Applying the acrylic adhesive so as to fix the first member and the second member;
A second curing step for curing the acrylic adhesive,
The first fixing step is performed before the second curing step, and is an adhesive fixing method.

  2. The adhesive fixing method according to 1 above, wherein the acrylic adhesive is applied adjacent to the epoxy adhesive.

  3. The adhesive strength after curing in the first curing step is a strength that cannot be removed unless a force of 100 times or more of the total weight of the first member and the second member is applied. 3. The adhesive fixing method according to 2.

  4). The adhesive strength after curing in the second curing step is a strength that cannot be removed unless a force of 200 times or more of the total weight of the first member and the second member is applied. 4. The adhesive fixing method according to any one of 3 above.

5). An optical element fixing method for fixing an optical element using the adhesive fixing method according to any one of 1 to 4,
Each of the first member and the second member has an optical surface,
A position adjusting step of adjusting and maintaining a relative position between the first member and the second member;
An optical element fixing method comprising performing the first curing step and the second curing step after the position adjusting step.

  According to the bonding and fixing method of the present invention, the first member and the second member are fixed with a relative positional shift suppressed more than the curing of the epoxy adhesive having a relatively large change with time but a relatively small curing shrinkage rate. The epoxy adhesive cured between the first member and the second member functions as a spacer that determines the distance between the first member and the second member. Furthermore, the cured epoxy adhesive having a relatively large cure shrinkage, but having a relatively small change with time and a high adhesive strength, the first member and the second member are between the two members. Thus, the relative position shift due to curing shrinkage of the acrylic adhesive is suppressed, the change with time is relaxed, and the acrylic adhesive is more firmly fixed.

  Therefore, there is provided an adhesive fixing method that can be accurately and firmly fixed with an adhesive.

It is a top view which shows typically the state by which the 1st lens and the 2nd lens are being fixed with the 1st adhesive agent and the 2nd adhesive agent. It is a figure which shows sectional drawing seen toward the arrow direction in the position of X-X 'shown in FIG. In the first lens 1 and the second lens 2, the relative positions of the interval, inclination, and parallel shift are adjusted, and the lens unit is manufactured by fixing with the first adhesive and the second adhesive. It is a figure which shows a manufacturing apparatus typically. (A) is a figure which shows the example of the relative position of the 1st lens of the initial state before adjustment, and a 2nd lens. (B) is a figure which shows the example of the relative position of the 1st lens and 2nd lens after adjustment. 6 is a diagram illustrating a tilt state of a second lens in Embodiment 1. FIG. It is a figure which shows the inclination state of the 2nd lens in the comparative example 1 and the comparative example 2. FIG.

  Although the present invention will be described based on the illustrated embodiment, the present invention is not limited to the embodiment.

  In FIG. 1, a first lens 1 as a first member and a second lens 2 as a second member are fixed by a first adhesive 3a and a second adhesive 3b, which are two types of adhesives. It is a top view which shows the state typically. FIG. 2 is a cross-sectional view of the fixed first lens 1 and second lens 2 shown in FIG. The first lens 1 and the second lens 2 are adjusted in the distance, inclination, and parallel shift, and within the allowable error range for satisfying the required optical performance, the first adhesive 3a and the second adhesive 3b. It is fixed with.

  Here, the interval is a so-called air interval. However, in the description of the present embodiment, when the first lens 1 and the second lens 2 are fixed, the frame 1 a of the first lens 1 and the second lens 2 are fixed. An interval G between the surfaces facing the frame 2a is shown (see FIG. 2). The tilt indicates a so-called tilt eccentricity, the relative tilt between the optical axis AX1 of the first lens 1 and the optical axis AX2 of the second lens 2, and the parallel shift indicates a so-called parallel eccentricity, and there is no tilt. Taking the case as an example, the parallel shift amount indicates the distance between the optical axis of the first lens 1 and the optical axis of the second lens 2.

  2 shows a state where the first lens 1 and the second lens 2 are ideally bonded and fixed in an ideal shape, and the inclination between the optical axis AX1 of the first lens 1 and the optical axis AX2 of the second lens 2 is shown. There is no parallel shift, and the entire circumference of the gap G between the first lens 1 and the second lens 2 has a predetermined value.

  The first adhesive 3a is an epoxy adhesive, the second adhesive 3b is an acrylic adhesive, and the first adhesive 3a and the second adhesive 3b are adjacent to each other as shown in FIG. The first lens 1 and the second lens 2 are fixed by being applied and cured at positions adjacent to each other. Since the first adhesive 3a and the second adhesive 3b are adjacent to each other, generation of distortion at the time of curing, which will be described later, is suppressed, and a gap G is suppressed.

  The material forming the first lens 1 and the second lens 2 is a material in which the adhesive force by the acrylic adhesive is larger than the adhesive force by the epoxy adhesive, and is PC (polycarbonate) in this example.

  As shown in FIG. 2, the first lens 1 and the second lens 2 are fixed with a first adhesive 3 a and a second adhesive 3 b in between so as not to contact each other with a gap G. The position of the adhesive is preferably a well-balanced position where the outer periphery is equally divided on the surface where the first lens 1 and the second lens 2 face each other or in the vicinity of the outer periphery thereof. Such a position of the adhesive balances the strain force generated by the curing shrinkage, and can make it difficult to cause, for example, a parallel shift or an inclination. The position of the adhesive may be equally divided on the outer circumference of the second lens 2 as shown in FIG. 2, or may be the entire circumference. As the position of the adhesive, for example, three positions are preferable as the outer periphery of the lens, four positions at the corners when the lens is square, and two positions as the rotationally asymmetric shape. When it is not necessary to seal the internal space formed by combining the first lens 1 and the second lens 2 with the outside, a sufficient fixing force can be obtained rather than providing the adhesive all around the circumference. It is preferable that the circumference is equally divided as long as possible, from the viewpoint of applying each adhesive, shortening the curing time, and curing in a well-balanced manner.

  After adjusting the relative position using the first lens 1 and the second lens 2 so that the respective distances, inclinations, and parallel shifts are within the allowable range, the two types are used as described above. FIG. 3 schematically shows a manufacturing apparatus 100 for manufacturing the lens unit A by fixing with an adhesive. The manufacturing apparatus 100 includes an adjustment unit 110, an illumination unit 120, an imaging unit 130, a UV light irradiation unit 140, an adhesive application unit (not shown), and a control unit 150 that controls the entire apparatus.

  The adjustment unit 110 fixes the second lens 2 relative to the first lens 1 on the upper side of the first lens 1 via a fixing base 112 that fixes the first lens 1 at a predetermined position and a holding unit 111a. And an adjustment mechanism 111 for movement. The fixed base 112 has an opening 112a so that the imaging unit 130 can capture an optical image of the chart 122 included in the illumination unit 120 formed by the first lens 1 and the second lens 2 that is held as an electrical signal. Is provided.

  The illumination unit 120 includes a light source unit 121 that emits light and a transmissive chart 122 that is illuminated by light emitted from the light source unit 121. The chart 122 is used to measure optical aberration as information that can adjust the relative positions of the first lens 1 and the second lens 2 of the lens unit A, and a pattern corresponding to the measurement content is a glass substrate. For example, it is formed of chromium or the like.

  The imaging unit 130 includes an imaging device such as a CCD, for example, converts the optical image of the chart 122 formed by the lens unit A on the imaging device into an electrical signal, and the converted electrical signal is sent to the control unit 150. Communicated.

  An adhesive application unit (not shown) applies a predetermined amount of the first adhesive 3 a and the second adhesive 3 b shown in FIGS. 1 and 2 to predetermined positions of the first lens 1 and the second lens 2. The adhesive application unit includes a discharge device that can discharge a predetermined amount of adhesive, such as a dispenser, and moves the discharge unit such as a pipe connected to the discharge device to an application position using a robot or the like. The structure is as follows. Such control of the adhesive application unit is performed by the control unit 150 described above.

  The UV light irradiation unit 140 irradiates a portion where the adhesive has been applied with UV light in order to cure the applied first adhesive 3a and second adhesive 3b. It is preferable that the UV light irradiation unit 140 includes the UV light irradiation unit 140 for each application location so that a plurality of locations where the adhesive is applied can be irradiated simultaneously. By irradiating the adhesive applied simultaneously with UV light, the curing of the adhesive at a plurality of locations can proceed in the same state, and the inclination and parallel shift mainly due to distortion at the time of curing can be suppressed.

  Specifically, for example, UV light may be guided to an irradiation position from a UV light generator (not shown) by, for example, an optical fiber so that a plurality of bonded portions can be irradiated with UV light simultaneously. The UV light irradiation unit 140 is the front end portion. The irradiation time of the UV light at the bonded portion can be easily controlled by, for example, a UV light generator provided with a shutter that blocks light incident on the optical fiber, and the control of the UV light irradiation can be performed by the control unit 150. Is done.

  The adjustment mechanism unit 111 moves the second lens 2 via the support unit 111a in order to adjust the lens unit A to have a desired optical performance by changing the relative position of the second lens 2 with respect to the first lens 1. Can be made. Specifically, the adjustment mechanism 111 adjusts the second lens relative to the fixed first lens 1 so that the relative distance, inclination, and parallel shift between the first lens 1 and the second lens 2 can be adjusted. 2 are moved in the vertical direction (Z direction), which is the optical axis direction, and in directions perpendicular to the optical axis (the X direction and the Y direction, where the X direction and the Y direction are orthogonal to each other). Further, it can be rotated (θ direction) around the X axis, for example, perpendicular to the optical axis. Such adjustment by the movement of the second lens 2 is performed by the control unit 150 controlling the adjustment mechanism unit 111.

  The chart 122 is illuminated by the light source unit 121, and an optical image of the chart 122 is formed on the imaging unit 130 by the lens unit A including the first lens 1 and the second lens 2 that are adjusted (interval, inclination, parallel shift). The

  The formed optical image is converted into an electrical signal by the imaging unit 130, and an electrical signal such as a video signal is converted into a digital signal by a grabber substrate or the like and taken into the control unit 150. The main part of the control unit 150 is configured by a personal computer or the like, and the digital signal of the optical image captured by the control unit 150 is arithmetically processed by a known method, and the optical aberration (coma aberration, image plane of the image unit) of the lens unit A is processed. Inclination (single blur), MTF value, etc.) can be obtained.

  A description will be given of manufacturing the lens unit A by bonding the first lens 1 and the second lens 2 with an adhesive using the manufacturing apparatus 100 described above.

  The first lens 1 is fixed to the fixing base 112, the second lens 2 is fixed to the support portion 111 a, and the second lens 2 is positioned at the initial position with respect to the first lens 1 by the adjustment mechanism portion 111. At this initial position, at least an optical image of the chart 122 is formed in the imaging unit 130, and information such as optical aberration obtained from the optical image is such that the relative position of the second lens 2 with respect to the first lens 1 is within an allowable range. It is a position that can be converged. Such an initial position can be obtained by simulation or experiment. Such an initial position is stored in the control unit 150 in advance, and after the first lens 1 and the second lens 2 are arranged at predetermined positions of the manufacturing apparatus 100, the second lens is automatically operated by the operation of the control unit 150. It is preferable to be able to arrange 2 at the initial position from the viewpoint of increasing manufacturing efficiency. FIG. 4A schematically shows an example in which the first lens 1 and the second lens 2 are held in the initial state. The inclinations of the optical axis AX1 of the first lens 1 and the optical axis AX2 of the second lens 2 do not match and there is a shift in parallel shift, and the gap G between the first lens 1 and the second lens 2 is larger than the desired gap. Is different.

  Next, the chart 122 is illuminated by the light source unit 121, and an optical image of the chart 122 is formed on the image sensor 140 by the lens unit A including the first lens 1 and the second lens 2.

  The formed optical image of the chart 122 is converted into image data of an electrical signal by the imaging unit 130, and is taken into the control unit 150. The control unit 150 performs predetermined arithmetic processing on the image data, and optical aberration data (coma aberration). , Image plane inclination (single blur), MTF value, etc.) are obtained. Based on the obtained optical aberration data, the control unit 150 controls the adjustment mechanism unit 111 so that the optical aberration is within a predetermined allowable range so that a good optical image can be formed. 2 Position the lens 2. Capture of image data of an optical image formed by the lens unit A, calculation processing of the captured image data, and a series of operations for positioning the second lens 2 by the adjustment mechanism unit 111 based on optical aberration data obtained by the calculation processing Is preferably once from the viewpoint of efficiency, but is not limited to once, and may be repeated a plurality of times.

  When the optical aberration obtained by the above adjustment falls within a predetermined range, the adjustment operation is finished, and the support portion 111a of the adjustment mechanism 111 is held at the position when the adjustment is completed, and the first lens 1 at this time The state of the second lens 2 is shown in FIG. Deviations in inclination and parallel shift between the optical axis AX1 of the first lens 1 and the optical axis AX2 of the second lens 2 are within an allowable range, and a predetermined gap G of the entire circumference between the first lens 1 and the second lens 2 is obtained. The amount of deviation from the value is within the allowable range. When the adjustment is completed, the relative positions of the first lens 1 and the second lens 2 are held by the fixing unit 102 and the instruction unit 111a in a state where the first lens 1 and the second lens 2 are not in contact with each other and have a gap (interval G). In this way, the first lens 1 is fixed with an adhesive while the second lens 2 is held.

  As shown in FIGS. 1 and 2, the epoxy adhesive that is the first adhesive 3 a is located between the first lens 1 and the second lens 2 and divides the outer periphery of the second lens 2 into three equal parts. Apply to.

  After apply | coating the 1st adhesive agent 3a, UV light irradiation part 140 is simultaneously irradiated to UV light application part, and the 1st adhesive agent 3a is hardened. The cured state of the first adhesive 3a is preferably a completely cured state, but it is not necessarily a completely cured state, and the relative position between the first lens 1 and the second lens 2 is that of the subsequent second adhesive 3b. Even if it applies and hardens | cures, it should just be a state which can be maintained within an allowable range. Such a cured state may be at least as long as the adhesion portion does not peel off even when a force approximately 100 times the total weight of the two parts to be fixed is applied. Curing conditions that achieve such a preferable curing state can be obtained in advance by experiments or the like, and the curing conditions can be adjusted by the irradiation energy of UV light and the irradiation time.

  After hardening of the 1st adhesive agent 3a shall be more than said hardening state, application | coating and hardening of the 2nd adhesive agent 3b are performed. The second adhesive 3b is an acrylic adhesive, and is applied and cured so as to be adjacent to the first adhesive 3a. Even if the lens unit A is removed from the manufacturing apparatus 100, the cured state may be a state in which the adjusted relative position between the first lens 1 and the second lens 2 can be maintained within an allowable range. Such a cured state may be at least as long as the adhesion portion does not peel off even when a force approximately 200 times the total weight of the two parts to be fixed is applied. As in the case of the first adhesive 3a, the curing conditions for obtaining such a preferable cured state can be obtained in advance by experiments or the like. The curing conditions include the irradiation energy and irradiation time of UV light. Can be adjusted.

  After the curing of the second adhesive 3b is completed, the lens unit A may be taken out from the manufacturing apparatus 100, and UV light may be further irradiated as the main curing as necessary to further increase the degree of curing. In this main curing, a change in the relative position between the first lens 1 and the second lens 2 is equivalent to hardly occurring in practice.

Table 1 shows the main characteristics of the epoxy adhesive that is the first adhesive 3a and the acrylic adhesive that is the second adhesive 3b. The epoxy adhesive is 8797A (manufactured by Kyoritsu Chemical Industry), and the acrylic adhesive is 3030 (manufactured by ThreeBond). The material of the member to be bonded and fixed was iron, and was cured by UV light irradiation. The illuminance energy of the irradiated UV light was about 50 mW / cm ² and the irradiation time was 90 seconds.

  As shown in Table 1, the epoxy adhesive has a characteristic that the adhesive force is relatively weak, but the curing shrinkage rate is small, and the shrinkage progresses with time after UV irradiation. In contrast, an acrylic adhesive has a relatively strong adhesive force and a high cure shrinkage ratio, but has a characteristic that shrinkage does not occur over time after UV irradiation.

  As described above, the relative position between the first lens 1 and the second lens 2 is not determined by mechanical abutment using a spacer or the like, but the relative position is adjusted by the adjusting mechanism. For this reason, a gap is provided between the first lens 1 and the second lens 2 so that the relative position can be adjusted. For this reason, when the adhesive between the first lens 1 and the second lens 2 contracts, the gap may decrease, that is, the relative position may shift. Therefore, in this embodiment, the first adhesive 3a, which is an epoxy adhesive, is used as the first lens 1 and the second lens while the adjusted relative position between the first lens 1 and the second lens 2 is maintained. It is applied and hardened so as to fill the gap with 2. When cured, the adhesion is relatively weak while the cure shrinkage is low so that the adjusted relative position is maintained within an acceptable range.

  After the curing of the first adhesive 3a is completed, the second adhesive 3b, which is an acrylic adhesive, is applied and cured while the shrinkage does not progress with time. Since the first adhesive 3a that has already been cured is located between the first lens 1 and the second lens 2 and maintains a relative position and functions as a spacer that determines the interval, the curing shrinkage rate of the second adhesive 3b Is relatively large, but the curing shrinkage of the second adhesive 3b is suppressed by the cured first adhesive 3a. Moreover, since the 2nd adhesive agent 3b has almost no shrinkage | contraction by the time passage after UV light irradiation, it can suppress the shrinkage | contraction by the time passage of the 1st adhesive agent 3a. Therefore, the positional deviation between the first lens 1 and the second lens 2 can be within an allowable range, and the lens unit A is not displaced from the manufacturing apparatus 100 after the second adhesive 3b is cured. Since it can be taken out quickly, good production efficiency can be obtained.

  Moreover, since the adhesive force of the second adhesive 3b is larger than that of the first adhesive 3a, the first lens 1 and the second lens 2 can be fixed more firmly than the first adhesive 3a alone. In particular, the first adhesive 3a is easily peeled off by impact, but the impact resistance can be improved by an acrylic adhesive whose second defect is the second adhesive 3b.

  As described above, when the first lens 1 and the second lens 2 are bonded and fixed using the first adhesive 3a and the second adhesive 3b, the relative positions after adjustment hardly change and change with time. Can be reduced, and can be firmly fixed. In addition, since the epoxy adhesive is not completely cured with the first lens 1 and the second lens 2 held in the manufacturing apparatus, the fixing operation of the first lens 1 and the second lens 2 is made efficient. be able to.

  Therefore, the first lens 1 and the second lens 2 can be fixed with high efficiency and accuracy.

  In the above description, the first adhesive 3a is applied after the position adjustment between the first lens 1 and the second lens 2, but is not limited to this. For example, the first lens 1 and the second lens are applied. 2 may be before adjustment of the initial position or the like held in a state with a gap.

  In addition, the second adhesive 3b is applied after the first adhesive 3a is cured. However, the present invention is not limited to this. For example, UV light can be blocked so that the second adhesive 3b does not cure. Thus, the application of the second adhesive 3b may be performed simultaneously with the application of the first adhesive 3a or during the curing of the first adhesive 3a, for example. Also, if the first adhesive 3a and the second adhesive 3b having different wavelengths of light to be cured are used, two types of light sources need to be prepared, but there is no need for light shielding, and the manufacturing apparatus is It can be simple.

  In this example, the first adhesive 3a and the second adhesive 3b are cured by irradiating UV light as an example. However, the present invention is not limited to this, and curing by irradiation with visible light or heating instead of UV light. It may be a method.

  As described above, the first lens 1 and the second lens 2 can be firmly fixed while maintaining the adjusted relative positions within an allowable range. At this time, the first lens 1 and the second lens 2 have a gap without contacting each other. For this reason, the accuracy with respect to the optical surface such as the position and inclination of the surface of the opposing frame of the first lens 1 and the second lens 2 is relaxed.

  Further, since the relative position between the first lens 1 and the second lens 2 can be fixed with high accuracy, the lens unit A manufactured as a result can obtain good optical performance, and is attached when the lens unit A is attached. Tolerances can be relaxed.

  In the present embodiment, the adhesive fixing method according to the present invention has been described by taking a lens made of PC (polycarbonate) as an example, but the member to be adhesively fixed is not limited to the lens. Also, the material of the member to be fixed is not made of PC (polycarbonate), and the same effect can be obtained as long as the member is made of a material whose adhesive force by the acrylic adhesive is larger than the adhesive force by the epoxy adhesive. .

Example 1
The first lens 1 (diameter φ30 mm) and the second lens 2 (diameter φ20 mm) made of PC (polycarbonate) were bonded. The total weight of the first lens 1 and the second lens 2 is 6.7 g.

  Using the adjusting device 100 described with reference to FIG. 3, the tilt, spacing, and parallel shift between the first lens 1 and the second lens 2 were adjusted.

  The distance G between the lens frame 1a of the first lens 1 and the lens frame 2a of the second lens 2 with the adhesive interposed therebetween was about 0.1 mm.

After the adjustment, first, an epoxy adhesive 8797A (manufactured by Kyoritsu Chemical Industry Co., Ltd.) is applied as a first adhesive 3a using a dispenser at a position that divides the circumference into three equal parts as shown in FIG. Thereafter, the first adhesive 3a was cured by irradiation with UV light under predetermined irradiation conditions. The degree of cure of the first adhesive 3a was able to withstand a predetermined tensile strength (6.6 N or more), and UV light irradiation conditions were determined so as to obtain this strength. The illuminance energy of the irradiated UV light was about 50 mW / cm ² and the irradiation time was 90 seconds. This is called the first UV light irradiation.

Next, an acrylic adhesive 3030 (manufactured by ThreeBond) is used as the second adhesive 3b, and a predetermined amount is dispensed using a dispenser as shown in FIG. 1, and the circumference is adjacent to the position where the first adhesive 3a is provided. It apply | coated to the position which divides into 3 parts, Then, UV light was irradiated on predetermined irradiation conditions, and the 2nd adhesive agent 3b was hardened. The degree of cure of the second adhesive 3b can withstand a predetermined tensile strength (13.1 N or more), and the UV irradiation conditions were determined so as to obtain this strength. The illuminance energy of the irradiated UV light was about 50 mW / cm ² and the irradiation time was 30 seconds. This is called the second UV light irradiation.

  As an evaluation of the displacement of the relative position between the first lens 1 and the second lens 2, a minute mirror was provided on the upper surface end of the frame of the second lens 2, and the change in inclination was measured from above the second lens 2 using an autocollimator. .

After the first adhesive 3a is applied, before the first UV light irradiation, after 90 seconds of UV light irradiation, left for 1 minute, after the application of the second adhesive 3b, after the second UV light irradiation, for 1 minute FIG. 5 shows a state of inclination for 300 seconds every 30 seconds after the second lens 2 is released from the support portion 111a after being left. The amount of inclination when 300 seconds passed after releasing from the support portion 111a was 8.6 seconds. In addition, the first lens 1 and the second lens 2 were pulled away from each other, and the force at the time of peeling was measured. As a result, it was 36.3N.
(Comparative Example 1)
The same as Example 1 except that the second adhesive 3b was not applied, and after applying the first adhesive 3a (epoxy adhesive 8797A (manufactured by Kyoritsu Chemical Industry)), before UV light irradiation, UV light 90 seconds FIG. 6 shows a state of inclination for 300 seconds every 30 seconds after the second lens 2 is released from the support portion 111a after being left for 1 minute after irradiation.

After releasing the second lens 2 from the support portion 111a, it was found that the amount of inclination increased, and the amount of inclination when 300 seconds passed after the release was 38 seconds. In addition, the first lens 1 and the second lens 2 were pulled away from each other, and the force at the time of peeling was measured. As a result, it was 14.7N.
(Comparative Example 2)
The second adhesive is the same as in Example 1 except that the second adhesive 3b (acrylic adhesive 3030 (manufactured by Three Bond)) is applied for 90 seconds without applying the first adhesive 3a. After applying the agent 3b, before UV light irradiation, after UV light irradiation for 90 seconds, after standing for 1 minute, after releasing the second lens 2 from the support portion 111a, the state of inclination for 300 seconds every 30 seconds is shown in FIG. Shown in

  It can be seen that the amount of inclination increases rapidly upon irradiation with UV light, and after UV irradiation, the amount of inclination is large but stable. After the second lens 2 was released from the support portion 111a, the amount of tilt when 300 seconds passed was 78 seconds. In addition, the first lens 1 and the second lens 2 were pulled away from each other, and the force at the time of peeling was measured. As a result, it was 70.6N.

  From the results of Example 1, Comparative Example 1 and Comparative Example 2 above, the first lens 1 and the second lens 2 are used together with the first adhesive 3a and the second adhesive 3b as in Example 1. It was confirmed that by fixing, as compared with Comparative Example 1 and Comparative Example 2, the amount of inclination is small and can be fixed with high accuracy. Moreover, although the adhesive force of Example 1 which combined the 1st adhesive agent 3a and the 2nd adhesive agent 3b is inferior to the intensity | strength of only the 2nd adhesive agent 3b of the comparative example 2, only the 1st adhesive agent 3a of the comparative example 1 is inferior. It was confirmed that the required strength was sufficiently provided.

DESCRIPTION OF SYMBOLS 1 1st lens 2 2nd lens 1a, 2a Frame 3a 1st adhesive agent 3b 2nd adhesive agent G space | interval AX1, AX2 Optical axis 100 Manufacturing apparatus 110 Adjustment part 120 Illumination part 130 Imaging part 140 UV light irradiation part 150 Control part A Lens unit

Claims (5)

An adhesive fixing method for fixing the first member and the second member using an epoxy adhesive and an acrylic adhesive,
The first member and the second member are made of a material in which at least a portion where the first member and the second member are bonded and fixed has an adhesive force by the acrylic adhesive larger than an adhesive force by the epoxy adhesive. Consists of
Applying the epoxy adhesive between the first member and the second member;
A first curing step for curing the epoxy adhesive;
Applying the acrylic adhesive so as to fix the first member and the second member;
A second curing step for curing the acrylic adhesive,
The first fixing step is performed before the second curing step, and is an adhesive fixing method.   The adhesive fixing method according to claim 1, wherein the acrylic adhesive is applied adjacent to the epoxy adhesive.   The adhesive strength after curing in the first curing step is a strength that cannot be removed unless a force of 100 times or more of the total weight of the first member and the second member is applied. Or the adhesive fixing method of 2.   The adhesive strength after curing in the second curing step is a strength that cannot be removed unless a force of 200 times or more of the total weight of the first member and the second member is applied. 4. The adhesive fixing method according to any one of items 1 to 3. An optical element fixing method for fixing an optical element using the adhesive fixing method according to any one of claims 1 to 4,
Each of the first member and the second member has an optical surface,
A position adjusting step of adjusting and maintaining a relative position between the first member and the second member;
An optical element fixing method comprising performing the first curing step and the second curing step after the position adjusting step.

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