JP2016085311A - Lens assembly and assembling method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate a coating operation of an adhesive when a lens is bonded to a lens frame and to easily facilitate suppressing a positional deviation and a distortion of a lens due to curing shrinkage of the adhesive in a lens assembly.SOLUTION: A lens unit 1 includes: a lens frame 3 formed with a lens 2, an inner peripheral surface 3a to which the lens 2 is inserted, and an adhesive introduction hole 3e opened in an axial direction of the inner peripheral surface 3a in a region expanding radially outward from the inner peripheral surface 3a in order to introduce an adhesive; an adhesive auxiliary member 4 for regulating a storage amount of the adhesive arranged between a radial wall surface part 3f and a lens side surface 2c inserted into the inner peripheral surface 3a and upper than a bottom surface part 3c of the adhesive introduction hole 3e in the adhesive introduction hole 3e; and an adhesive cured body 5 formed and cured with the adhesive coated between at least the adhesive auxiliary member 4 and the lens side face 2c in the adhesive introduction hole 3e and fixing the lens side face 2c and the lens frame 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lens assembly and an assembling method thereof.

Conventionally, when a lens assembly is manufactured by fixing a lens to a lens frame, the lens and the lens frame are fixed by adhesion.
However, since volume changes such as curing shrinkage occur during curing, the lens position before curing may change after curing or the lens may be distorted. For this reason, a technique for suppressing lens position shift and distortion due to curing shrinkage of the adhesive has been proposed.
For example, Patent Document 1 describes a method for bonding adherends in which adherends are bonded using an energy curable adhesive in which a large number of thin-walled, small-diameter microcapsules surrounding a core substance such as gas are enclosed.
In the bonding method of the adherend described in Patent Document 1, when the adhesive undergoes cure shrinkage, the microcapsule is deformed or ruptured to compensate for the cure shrinkage amount of the adhesive, and thus the tensile force acting on the adherend Stress and displacement can be reduced.

JP 2005-225904 A

However, the prior art as described above has the following problems.
The influence of the curing shrinkage of the adhesive varies depending on the application shape and the application amount of the adhesive. On the other hand, as in the technique described in Patent Document 1, when microcapsules are contained in an adhesive to suppress cure shrinkage, the suppression effect varies depending on the amount, elastic modulus, strength, and the like of the microcapsules.
For this reason, in the technique described in Patent Document 1, it is necessary to prepare an adhesive containing microcapsules in which the configuration and content of the microcapsules are appropriately adjusted according to the application condition of the adhesive, and perform bonding. . In addition, since it is difficult to theoretically obtain appropriate microcapsule conditions for suppressing lens position shift and distortion, preliminary experiments and the like are required.
For this reason, the technique described in Patent Document 1 takes time and effort to prepare an adhesive with microcapsules for suppressing the positional deviation and distortion of the lens according to various bonding conditions, and can be easily used. There is a problem that it is not technology.
In addition, since the cure shrinkage rate of the adhesive which does not contain a microcapsule is determined depending on the type of the adhesive, it is also conceivable that the thickness of the adhesive applied is such that the cure shrinkage is within an allowable range.
However, since the allowable range of lens position deviation is extremely narrow, the allowable coating thickness is extremely thin. On the other hand, the adhesive used for adhering the lens has low fluidity so that the lens surface is not soiled by dripping. For this reason, when the allowable coating thickness is reduced, there is a problem that the adhesive cannot be penetrated into the gap between the lens and the lens frame, and adhesion failure is likely to occur.
When the fluidity of the adhesive is increased, there is a problem that the work efficiency of the application work decreases because it is necessary to perform the application work so as not to stain the lens surface.

  The present invention has been made in view of the above-described problems, and makes it easy to apply an adhesive when the lens is bonded to the lens frame, and the lens position shift caused by the curing shrinkage of the adhesive and It is an object of the present invention to provide a lens assembly that can easily suppress distortion and an assembling method thereof.

  In order to solve the above-described problems, a lens assembly according to a first aspect of the present invention includes a lens, a lens insertion hole into which the lens is inserted, and a side surface of the lens that is inserted into the lens insertion hole. A lens frame formed with an adhesive introduction hole having an opening that opens in the axial direction of the lens insertion hole in a region extending radially outward from the inner peripheral surface of the lens insertion hole in order to introduce the agent; In the adhesive introduction hole, disposed between the outermost wall surface part and the side surface of the lens inserted into the lens insertion hole and above the deepest bottom surface part of the adhesive introduction part, In the adhesive regulating portion that regulates the amount to be accommodated, and in the adhesive introduction hole, at least the adhesive applied between the adhesive regulating portion and the side surface of the lens is formed by curing, and the side surface of the lens Fix the lens frame An adhesive cured product that is configured to include a.

  In the lens assembly, it is preferable that the adhesive restricting portion is configured by introducing an auxiliary bonding member different from the adhesive from the opening of the adhesive introduction hole.

  In the lens assembly, it is preferable that the adhesion assisting member is an elastic member that can be deformed by a force acting on the adhesive when the adhesive is cured.

  In the lens assembly, it is preferable that the adhesion assisting member includes a hollow tube.

  In the lens assembly, it is preferable that the adhesive restricting portion is constituted by a convex portion that protrudes into the adhesive introduction hole.

  A method for assembling a lens assembly according to a second aspect of the present invention is a method for assembling a lens assembly in which a lens is bonded to a lens frame to form a lens assembly, and the lens is disposed in the lens frame. In the adhesive introduction hole having an opening that opens in the axial direction of the lens insertion hole in a region extending radially outward from the inner circumferential surface of the lens insertion hole, the outermost wall surface portion and the lens insertion hole are inserted into the lens insertion hole. Forming an adhesive restricting portion that is disposed between the side surface of the lens and above the deepest bottom surface portion of the adhesive introduction hole and restricts the amount of the adhesive; and in the lens insertion hole Arranging the lens, and an adhesive introduction step of introducing the adhesive between at least the adhesive regulating portion and the side surface of the lens in the adhesive introduction hole. Adhesive And curing the adhesive that has been introduced into the introducing hole, and a method of and an adhesive curing step for fixing the said lens frame and the side surface of the lens.

  In the method of assembling the lens assembly, in the lens arranging step, the adhesive regulating portion is formed by introducing an adhesion auxiliary member different from the adhesive from the opening of the adhesive introduction hole. Is preferred.

  In the method for assembling the lens assembly, the position of the lens relative to the lens frame is adjusted by moving the lens between the time when the adhesive introduction step is completed and the time when the adhesive curing step is completed. It is preferable to include a lens position adjusting step to be performed.

  According to the lens assembly and the assembling method of the present invention, the adhesive introduction hole of the lens frame includes the adhesive restricting portion, and at least the lens with the adhesive applied between the adhesive restricting portion and the side surface of the lens. Since the lens frame is fixed, it is easy to apply the adhesive when the lens is bonded to the lens frame, and it is possible to easily suppress the displacement and distortion of the lens due to the curing shrinkage of the adhesive. There is an effect.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic plan view showing an example of the configuration of a lens assembly according to a first embodiment of the present invention and a cross-sectional view taken along the line A-A. It is the typical top view which shows an example of a structure of the lens frame used for the lens assembly of the 1st Embodiment of this invention, and its BB sectional drawing. It is process explanatory drawing which shows the lens arrangement | positioning process of the assembly method of the lens assembly of the 1st Embodiment of this invention, and its DD sectional drawing. It is process explanatory drawing which shows the adhesive agent introduction process of the assembly method of the lens assembly of the 1st Embodiment of this invention. It is process explanatory drawing which shows the lens position adjustment process of the assembly method of the lens assembly of the 1st Embodiment of this invention. It is typical sectional drawing explaining the effect | action of the adhesive agent in the assembly method of the lens assembly of a comparative example. It is typical sectional drawing explaining the effect | action of the adhesive control part in the assembly method of the lens assembly of the 1st Embodiment of this invention. FIG. 6 is a schematic plan view and an EE cross-sectional view showing an example of the configuration of a lens assembly of a modification (first modification) of the first embodiment of the present invention. It is the typical top view which shows an example of a structure of the lens assembly of the 2nd Embodiment of this invention, and its FF sectional drawing. It is the typical top view which shows an example of a structure of the lens assembly of the 3rd Embodiment of this invention, and its GG sectional drawing.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In all the drawings, even if the embodiments are different, the same or corresponding members are denoted by the same reference numerals, and common description is omitted.

[First Embodiment]
A lens assembly according to a first embodiment of the present invention will be described.
FIG. 1A is a schematic plan view showing an example of the configuration of the lens assembly according to the first embodiment of the present invention. FIG.1 (b) is AA sectional drawing in Fig.1 (a). FIG. 2A is a schematic plan view showing an example of the configuration of a lens frame used in the lens assembly according to the first embodiment of the present invention. FIG. 2B is a BB cross-sectional view in FIG.

As shown in FIGS. 1A and 1B, the lens unit 1 (lens assembly) of the present embodiment is assembled by the lens assembly assembly method of the present embodiment, with the lens 2 inserted into the lens frame 3. Lens assembly.
Here, the “lens assembly” means a single assembly in which the lens is fixed to the lens holding frame. For this reason, the lens assembly may be in a form that itself constitutes a product, such as an interchangeable lens, or a semi-finished product such as an exchange unit that constitutes a part of the product, or a manufacturing process of the product It may be a subassembly that only appears. For example, when a moving lens group and a fixed lens group are fixed to separate lens holding frames in a zoom lens, the lens barrel unit including the moving lens group and the lens barrel unit including the fixed lens group are each a lens assembly. Consists of a solid.
The lens unit 1 can include a plurality of lenses. When the lens unit 1 includes a plurality of lenses, at least one lens among the plurality of lenses may be assembled by the lens assembly assembling method of the present embodiment.
Hereinafter, an example in which the lens unit 1 has only one lens 2 will be described as an example. The lens 2 may be a single lens or a cemented lens.

  In this specification, when describing the relative position with respect to an axial member, a cylindrical member, or the like that can specify an axis such as the optical axis or the central axis, the direction along the axis is the axial direction, and the direction of circling around the axis is the circumferential direction. A direction along a line intersecting the axis in a plane orthogonal to the axis is referred to as a radial direction. In particular, the direction along the optical axis may be referred to as the optical axis direction. In the radial direction, the direction away from the axis may be referred to as a radially outward (outside), and the direction approaching the axis may be referred to as a radially inward (inside).

  The lens unit 1 includes a lens 2, a lens frame 3, an adhesion auxiliary member 4 (adhesive regulating part), and an adhesive cured body 5.

The lens 2 has a first lens surface 2a and a second lens surface 2b as an example, and a single lens having a cylindrical lens side surface 2c having a diameter D2 centered on the lens optical axis O formed on the outer periphery thereof. It is.
The shape of the 1st lens surface 2a and the 2nd lens surface 2b is not specifically limited, For example, appropriate surface shapes, such as a spherical surface, an aspherical surface, a free-form surface, a plane, are employable.
The first lens surface 2a and the second lens surface 2b may be convex surfaces or concave surfaces. Either one of the first lens surface 2a and the second lens surface 2b may be a flat surface.
Hereinafter, the lens 2 will be described as an example of a convex flat lens in which the first lens surface 2a is a convex spherical surface and the second lens surface 2b is a flat surface.

  The lens 2 can be manufactured from glass or synthetic resin. For example, when the lens 2 is made of glass, it can be manufactured by polishing glass, molding glass, or the like. When the lens 2 is made of a synthetic resin, it can be manufactured by injection molding or the like.

The lens frame 3 is a cylindrical member that houses the lens 2 and adjusts the position of the lens 2 and then adheres and fixes the lens 2. The position adjustment of the lens 2 in the lens frame 3 can be performed in the optical axis direction and the radial direction.
As shown in FIGS. 2A and 2B, the lens frame 3 includes a cylindrical frame portion 3A and a plate-like protruding portion 3B protruding inward from the inner peripheral surface 3a of the frame portion 3A. .

The frame portion 3A includes a cylindrical outer peripheral surface 3h extending in the entire axial direction, and a cylindrical inner peripheral surface 3a formed at an end portion on the side where the lens 2 is inserted (the upper end in FIG. 2A). Is provided.
The outer peripheral surface 3h is a reference surface that defines the radial position and shape of the lens frame 3, and in this embodiment, the central axis C is defined by the central axis of the outer peripheral surface 3h.
The inner peripheral surface 3a is formed coaxially with the central axis C. The inner diameter D3a of the inner peripheral surface 3a is D3a ≧ D2 + 2 + Δ, where 0 is the adjustment margin in the radial direction of the lens 2 (where Δ> 0). Thereby, when the lens 2 is inserted into the inner peripheral surface 3a, the position of the lens 2 in the radial direction can be adjusted within a range of 0 to Δ with respect to the central axis C.

The protruding portion 3B is an annular plate-like portion that projects in a direction orthogonal to the central axis C at an intermediate portion or an end portion in the axial direction of the frame portion 3A.
A circular through-hole 3d having an inner diameter smaller than the diameter D2 centered on the central axis C is penetrated in the thickness direction in the center of the protrusion 3B. In the present embodiment, as an example, the protruding portion 3B is formed at an intermediate portion in the axial direction of the frame portion 3A.
The protrusion 3B holds the lens 2 at a position closer to the other end side (the lower end side of FIG. 2A) of the lens frame 3 than the designed fixing position before fixing the lens 2 to the lens frame 3. Provided for. In the protruding portion 3B, a bottom surface portion 3c (deepest bottom surface portion) formed of a plane extending in a direction orthogonal to the central axis C is provided on the inner peripheral surface 3a side to hold the outer peripheral portion of the second lens surface 2b of the lens 2. Is formed.
In the lens frame 3, the inner peripheral surface 3 a and the bottom surface portion 3 c constitute a lens insertion hole into which the lens 2 is inserted.

In the lens frame 3, an adhesive introduction hole 3 e having an opening opening in the axial direction of the lens insertion hole is formed in a region extending radially outward from the inner peripheral surface 3 a.
The adhesive introduction holes 3e can be provided as many as necessary for bonding the lens 2 and fixing it to the lens frame 3. In the present embodiment, as an example, the inner peripheral surface 3a is formed at three positions that equally divide the inner peripheral surface 3a into three in the circumferential direction.

The adhesive introduction hole 3e includes an arc-shaped radial wall surface portion 3f (outermost wall surface portion) having a radius R3f (where R3f> D3a / 2) centered on the central axis C, and a circumference of the radial wall surface portion 3f. This is a radially outward recess with respect to the inner peripheral surface 3a, which is surrounded by circumferential wall surfaces 3g extending radially inward from both ends in the direction.
For this reason, in the adhesive introduction hole 3e, an opening surrounded by the axial end of the radial wall surface 3f and the circumferential wall 3g in the axial direction is formed, and each circumferential wall 3g in the radial direction is formed. The opening part pinched | interposed by the edge part of the radial inside is formed.

The adhesive introduction hole 3 e is a hole for introducing an adhesive for adhering the lens 2 to the lens frame 3 from an end portion in the axial direction of the lens frame 3.
In the adhesive introduction hole 3e, the radial direction size R3f-D3a / 2 of the adhesive introduction hole 3e is at least larger than (D3a-D2) / 2.
However, other conditions of the size of the adhesive introduction hole 3e can be set to appropriate conditions that facilitate the introduction of the adhesive. For example, when the adhesive is introduced using a syringe, the size of the adhesive introduction hole 3e in plan view is preferably larger than at least the outer diameter of the adhesive dropped from the syringe, More preferably, it is larger than the diameter. It is further preferable that the tip of the syringe can be inserted into the upper part of the adhesive introduction hole 3e.
In the present embodiment, as an example, R3f−D3a / 2 = 1.0 (mm) is employed with respect to (D3a−D2) /2=0.2 (mm). Further, the interval between the circumferential wall surfaces 3g is wide enough so that the central angle with respect to the central axis C is about 10 °. In this case, the syringe can be easily dropped into the range of the adhesive introduction hole 3e even if the outer diameter of the dropped adhesive is about 0.8 mm using a syringe having an outer diameter of about 1.0 mm. it can.

  The lens frame 3 having such a configuration can be manufactured by molding a synthetic resin using a mold. The lens frame 3 can also be manufactured by cutting a resin material or a metal.

As shown in FIGS. 1A and 1B, when the lens 2 is inserted into the lens frame 3, the adhesion assisting member 4 has a radial wall surface 3f and a lens side surface 2c in the adhesive introduction hole 3e. It is a member which is arrange | positioned above the bottom face part 3c, and regulates the accommodation amount of the adhesive agent accommodated in the adhesive agent introduction hole 3e.
When the adhesive auxiliary member 4 is disposed in the adhesive introduction hole 3e and then introduces the adhesive into the adhesive introduction hole 3e, the adhesion auxiliary member 4 excludes the adhesive, thereby accommodating the amount of adhesive. To regulate.

The volume of the adhesive removed by the adhesion assisting member 4 and the outer shape of the adhesion assisting member 4 are such that when the adhesive that can be introduced into the adhesive introduction hole 3e in which the adhesion assisting member 4 is disposed is cured, its curing shrinkage is reduced. The lens 2 is set so that the displacement and distortion of the lens 2 are within an allowable range due to the influence.
The method of setting the volume of the adhesive removed by the adhesion assisting member 4 and the outer shape of the adhesion assisting member 4 will be described later together with the action of the adhesive.
In the present embodiment, the auxiliary bonding member 4 is a hollow tube having a tube inner diameter that is slightly shorter than the circumferential length of the radial wall surface portion 3f and that does not penetrate with the viscosity of the adhesive used for bonding the lens 2. Consists of. The external shape of the auxiliary bonding member 4 is an o × d oval shape, and can be arranged in the adhesive introduction hole 3e so that the axial length is h and the radial length is d.
Here, the magnitude relationship between h and d varies depending on the size of the adhesive introduction hole 3e, but FIG. 1B shows an example where h> d.
Further, the major axis h of the auxiliary adhesion member 4 is set to a length slightly shorter than the depth of the adhesive introduction hole 3e, whereby the adhesive is covered so as to cover the adhesion auxiliary member 4 within the adhesive introduction hole 3e. It is possible to introduce.

  In this embodiment, the material of the adhesion assisting member 4 is made of an elastic material that can be deformed by a force acting from the adhesive when the adhesive used for bonding the lens 2 is cured. Examples of the elastic material suitable for the adhesion assisting member 4 include silicon resin and urethane resin.

The adhesive cured body 5 is formed by curing the adhesive applied to the lens side surface 2c so as to cover the auxiliary bonding member 4 disposed in the adhesive introduction hole 3e in the lens unit 1, and the lens side surface 2c and the lens. This is a shape portion for fixing the frame 3.
As the adhesive used for forming the cured adhesive 5, for example, any adhesive that can be used for conventional lens adhesion, such as an ultraviolet curable adhesive and a thermosetting adhesive, can be employed. is there.

Next, a method for assembling the lens assembly according to the present embodiment will be described using an example of assembling the lens unit 1 described above.
FIG. 3A is a process explanatory diagram illustrating a lens arrangement process of the assembling method of the lens assembly according to the first embodiment of the present invention. FIG.3 (b) is DD sectional drawing in Fig.3 (a). FIG. 4 is a process explanatory view showing an adhesive introduction process of the assembling method of the lens assembly according to the first embodiment of the present invention. FIG. 5 is a process explanatory view showing a lens position adjusting process of the assembling method of the lens assembly according to the first embodiment of the present invention.

  The assembling method of the lens assembly according to the present embodiment includes a lens arranging step, an adhesive introducing step, a lens position adjusting step, and an adhesive curing step, and performing these steps in this order.

  In the lens arranging step, the auxiliary bonding member 4 is arranged in each adhesive introduction hole 3e of the lens frame 3, and the lens 2 is arranged on the bottom surface portion 3c in the inner peripheral surface 3a of the lens frame 3. Including. However, the order of the arrangement of the adhesion auxiliary member 4 and the arrangement of the lens 2 may be either first or simultaneously. Hereinafter, as an example, an example in which each adhesion assisting member 4 is arranged after the lens 2 is arranged will be described.

First, the lens frame 3 is held on the lens frame holding stand 8 in such a posture that the opening portion and the bottom surface portion 3c of the adhesive introduction hole 3e face upward.
Next, the lens 2 is inserted into the inner peripheral surface 3a with the second lens surface 2b of the lens 2 facing the bottom surface portion 3c of the lens frame 3, and the second lens surface is placed on the bottom surface portion 3c in the inner peripheral surface 3a. The lens 2 is placed so that 2b abuts. At this time, the radial position of the lens 2 may be within the inner peripheral surface 3a. However, in order to introduce the adhesive introduced into each adhesive introduction hole 3e in a more balanced manner in the adhesive introduction process described later, the central axis of the lens side surface 2c is coaxial with the central axis C of the lens frame 3. It is preferable to arrange.

  Next, one adhesion auxiliary member 4 is arranged on each bottom surface portion 3c in the adhesive introduction hole 3e. At this time, as shown in FIG. 3B, the minor axis d of the adhesion assisting member 4 is arranged in a posture along the radial direction in the adhesive introduction hole 3e. Further, each adhesion assisting member 4 is separated from at least the lens side surface 2c so that a gap into which an adhesive described later can be introduced is formed between the adhesion assisting member 4 and the lens side surface 2c. In the present embodiment, the adhesion assisting member 4 is disposed at an intermediate portion between the radial wall surface portion 3f and the lens side surface 2c. For this reason, the adhesion assisting member 4 is separated from the radial wall surface portion 3f and the lens side surface 2c in the radial direction.

As described above, when the lens 2 and the adhesion assisting member 4 are arranged on the lens frame 3, the lens arrangement process ends.
After the completion of this step, the auxiliary bonding member 4 has a radial wall surface portion 3f that is the outermost wall surface portion in the adhesive introduction hole 3e and the lens side surface 2c of the lens 2 inserted into the inner peripheral surface 3a. And the adhesive control part which comprises the upper part bottom face part 3c which is the deepest bottom face part of the adhesive agent introduction hole 3e, and controls the accommodation amount of an adhesive agent is comprised.

Next, an adhesive introduction process is performed. As shown in FIG. 4, this step is a step of introducing the adhesive 5 </ b> A at least between the auxiliary bonding member 4 and the lens side surface 2 c in the adhesive introduction hole 3 e.
The adhesive 5A is an adhesive that becomes the adhesive cured body 5 when it is cured after being introduced into the adhesive introduction hole 3e.
In this step, the syringe 6 is disposed above the adhesive introduction hole 3e, and the adhesive 5A stored in the adhesive storage section (not shown) is used in a predetermined amount by the syringe 6 to the adhesive introduction hole 3e. Drip through the axial opening.
Thereby, the adhesive 5 </ b> A is dropped so as to cover the adhesion assisting member 4 from above in the adhesive introduction hole 3 e and is filled on the bottom surface portion 3 c that is not covered by the adhesion assisting member 4. In the present embodiment, the gaps formed between the adhesion auxiliary member 4 and the radial wall surface portion 3f and between the adhesion auxiliary member 4 and the lens side surface 2c are filled.
In this way, in the present embodiment, as indicated by a two-dot chain line in FIG. 4, the adhesive 5A is at least a middle portion in the longitudinal direction of the adhesion assisting member 4 between the radial wall surface portion 3f and the lens side surface 2c. Introduced to cover.
This is the end of the adhesive introduction process.

Next, a lens position adjustment process is performed. This step is a step of adjusting the position of the lens 2 with respect to the lens frame 3 by moving the lens 2 until the adhesive 5A is cured.
In the present embodiment, the position of the lens 2 in the direction along the central axis C (axial direction) and the position of the lens 2 in the direction orthogonal to the central axis C (radial direction) are adjusted.
As shown in FIG. 5, in this embodiment, the suction device 7 moves the lens 2 while holding the first lens surface 2 a of the lens 2 by suction.

First, the configuration of the adsorption device 7 will be described.
The adsorbing device 7 includes an adsorbing cylinder 7a having a lower end opened and a light-transmitting top plate part 7b fitted therein, and an aspirating pipe section 7c for sucking the atmosphere inside the adsorbing cylinder 7a to the outside. A suction pump (not shown) is connected to the suction pipe portion 7c.
The suction device 7 is movably supported by a moving mechanism (not shown) above the lens frame holding base 8. Thereby, the adsorption | suction apparatus 7 can move to the axial direction and radial direction of the lens frame 3 supported by the lens frame holding stand 8 at least.
At the lower end of the suction cylinder 7a, a suction part 7d made of a circular opening for sucking the first lens surface 2a of the lens 2 is formed.

  The top plate portion 7b is provided for measuring the optical performance of the lens unit 1 when the position of the lens 2 is adjusted. For example, the top plate portion 7 b can transmit the measurement light incident from below the lens frame holding base 8 and transmitted through the lens 2 upward. Therefore, if an unillustrated detection sensor for detecting the imaging position or wavefront is arranged above the top plate portion 7b, the imaging position or wavefront of the lens unit 1 can be measured by the transmitted light of the lens 2. it can. Thereby, the information of the adjustment amount of the lens 2 can be acquired.

In this step, first, the first lens surface 2 a of the lens 2 placed on the bottom surface portion 3 c is adsorbed by the adsorption portion 7 d of the adsorption device 7. Then, the measurement light is irradiated from below the lens unit 1, the measurement light transmitted through the lens 2 and the top plate portion 7b is detected by a detection sensor (not shown), and the amount of positional deviation of the lens 2 is calculated. Display on the display.
The operator moves the suction device 7 in such a direction as to eliminate such a positional deviation amount. At this time, since the adhesive 5A is not cured, the lens 2 can move freely.
At this time, the adhesive 5A adhering to the lens side surface 2c, the adhesion assisting member 4, and the bottom surface portion 3c of the lens 2 keeps adhering to each surface due to the surface tension of the adhesive 5A even if the lens 2 moves. .
Such position adjustment is repeated as necessary, and when the displacement amount of the lens 2 is adjusted within the allowable range, the movement of the suction device 7 is stopped and the position of the lens 2 is fixed.
This completes the lens position adjustment process.

Next, an adhesive curing step is performed. This step is a step of fixing the lens side surface 2c and the lens frame 3 by curing the adhesive 5A introduced into the adhesive introduction hole 3e.
As a method for curing the adhesive 5A, an appropriate curing method can be used according to the type of the adhesive 5A. For example, when the adhesive 5A is an ultraviolet curable adhesive, the part filled with the adhesive 5A is irradiated with ultraviolet rays. When the adhesive 5A is a thermosetting adhesive, the adhesive 5A is heated.
When the adhesive 5 </ b> A is cured, an adhesive cured body 5 is formed, and the lens 2 is fixed to the lens frame 3.
When the hardness of the adhesive cured body 5 is stabilized, the suction from the suction pipe portion 7c is stopped, and the suction cylinder 7a is moved upward.
In this way, the adhesive curing step is completed.
The lens unit 1 as shown in FIGS. 1A and 1B is assembled as described above.

Here, the operation of the adhesion assisting member 4 in the assembling method of the lens assembly of this embodiment will be described.
FIG. 6 is a schematic cross-sectional view for explaining the action of the adhesive in the assembling method of the lens assembly of the comparative example. FIG. 7 is a schematic cross-sectional view for explaining the operation of the adhesive regulating portion in the assembling method of the lens assembly according to the first embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view of the adhesive introduction hole 3e in the adhesive curing process in the comparative example in which the auxiliary bonding member 4 is not used in the method of assembling the lens assembly of the present embodiment.
In this comparative example, the adhesion auxiliary member 4 is not arranged in the lens arrangement step, and in the adhesive introduction step, the adhesive 5A is introduced in a state where the adhesion auxiliary member 4 does not exist on the bottom surface portion 3c of the adhesive introduction hole 3e. The Therefore, the adhesive 5A is filled on the bottom surface portion 3c in the adhesive introduction hole 3e, and between the radial wall surface portion 3f and the lens side surface 2c, the radial wall surface portion 3f and the lens side surface 2c are provided. A layer of the adhesive 5A corresponding to the radial distance W therebetween is formed.

When such an adhesive 5A is cured, an adhesive cured body 50 is formed. As a result of curing shrinkage at that time, the lens side surface 2c has a force F1 for lowering the lens side surface 2c downward, and a lens side surface 2c. A force F <b> 2 that pulls the outer side in the radial direction acts.
At this time, since the lens 2 is held by the suction device 7 (not shown), the lens 2 is distorted due to the stress caused by the external forces F1 and F2. Moreover, since the reaction of F1 and F2 acts on the adhesive cured body 50, stress is also generated in the adhesive cured body 50, and distortion is accumulated.
When the curing of the adhesive 5A is finished and the suction device 7 that restrains the lens 2 is removed, the distortion in the lens 2 and the adhesive cured body 50 is released as a permanent distortion, and the lens 2 is misaligned. It is divided into ingredients that cause For this reason, the curing shrinkage of the adhesive 5 </ b> A causes distortion or displacement of the lens 2.

On the other hand, in this embodiment, as shown in FIG. 7, the adhesion assisting member 4 is disposed in the lens disposing process, and in the adhesive introducing process, the adhesion assisting member 4 disposed on the bottom surface portion 3c of the adhesive introducing hole 3e. Adhesive 5A is introduced so as to cover. Therefore, the adhesive 5A is filled on the bottom surface portion 3c in the adhesive introduction hole 3e in a range excluding the adhesion auxiliary member 4. Specifically, the region of the radial width w1 between the lens side surface 2c and the adhesion auxiliary member 4 and the region of the radial width w2 between the adhesion auxiliary member 4 and the radial wall surface 3f are bonded. Above the auxiliary member 4, the adhesive 5 </ b> A is filled in a region having a radial width W extending from the inner peripheral surface 3 a to the lens side surface 2 c.
However, since the amount of the adhesive 5A above the adhesion auxiliary member 4 is smaller than the amounts of the widths w1 and w2, the adhesive 5A substantially has the width w1 and w2 across the adhesion auxiliary member 4. The adhesive 5A layer is divided into two layers.

When such an adhesive 5A is cured, it is the same as in the comparative example that it is cured while causing shrinkage, but the curing shrinkage of the adhesive 5A occurs substantially independently in the regions of the widths w1 and w2.
Here, assuming that the adhesion assisting member 4 is not deformed by the external force of curing shrinkage, even if only the volume of the adhesive 5A is considered, the external force acting on the lens side surface 2c is reduced as follows.
The axial force f1 acting on the lens side surface 2c in accordance with the curing shrinkage is reduced to approximately w1 / W times that of F1. Further, the radial force f2 acting on the lens side surface 2c is reduced to (w1 + w2) / W times with respect to F2.

Further, when the adhesion assisting member 4 is composed of a soft hollow tube as in the present embodiment, the adhesion assisting member 4 is deformed by an external force of curing shrinkage, and thus the external force acting on the lens side surface 2c is further reduced. The
For example, when curing shrinkage occurs in the radial direction in the regions of the widths w1 and w2, the adhesion assisting member 4 receives a tensile force in the radial direction from the adhesive 5A that contacts the inner side and the outer side in the radial direction. Then, the width d is further expanded to become the width d ′ (d ′> d, see FIG. 1A). Thereby, a part or all of the distortion due to curing shrinkage in the regions of the widths w1 and w2 is eliminated. As a result, the radial external force acting on the lens side surface 2c is reduced from f2 and may be zero in some cases.
Further, since the adhesion assisting member 4 is a soft tube shape, when it expands and deforms in the radial direction, it also expands in the axial direction, increasing the width h, and increasing the amount of curvature protruding in the radial direction. To do. For this reason, part or all of the distortion in the axial direction is eliminated in the regions of the widths w1 and w2. As a result, the axial external force acting on the lens side surface 2c is reduced from f1 and may be zero in some cases.

Thus, according to the present embodiment, when the adhesive 5A is cured, a part of the adhesive 5A is eliminated by the adhesion assisting member 4, and the distortion of the adhesive cured body 5 due to curing shrinkage is reduced.
Furthermore, according to this embodiment, the deformation | transformation of the adhesion auxiliary member 4 according to the external force which acts from the adhesive 5A reduces the distortion of the adhesive cured body 5 accompanying the curing shrinkage.
Combined with the effect of reducing the distortion of the cured adhesive 5, the distortion and displacement of the lens 2 can be reduced as compared with the comparative example.

Such an action of the adhesion assisting member 4 is based on the assumption that the shape and material of the adhesion assisting member 4 is assumed, and when the adhesive assisting member 4 is disposed in the adhesive introduction hole 3e, the shrinkage during curing of the adhesive 5A is calculated and simulated. It is possible to obtain suitable shapes and materials in various cases.
For example, in the example in which the shape of the adhesive introduction hole 3e is 1.5 mm × 1.5 mm and the material of the adhesive 5A is an acrylic UV curable adhesive, the shape of the auxiliary bonding member 4 has an outer diameter of 1 mm and an inner diameter of 0.4 mm. By using silicon rubber as the tube shape and the material, the distortion and displacement amount of the lens 2 after assembly can be reduced to 3 μm or less.
Since the auxiliary bonding member 4 does not need to be mixed in advance with the adhesive 5A, an appropriate shape is required when assembling other lens units having different materials for the adhesive 5A or different shapes of the adhesive introduction holes 3e. The assembly can be performed without changing the adhesive 5 </ b> A itself simply by selecting the adhesion auxiliary member 4 made of a material and placing it in the adhesive introduction hole 3 e.
In this case, since it is not necessary to change the supply part of the adhesive 5A, the time required for the setup change becomes unnecessary. Therefore, rapid assembly is possible even when switching to the assembly of different lens units.

As described above, according to the assembling method of the lens assembly of the present embodiment, the adhesion auxiliary member 4 is disposed in the adhesive introduction hole 3e of the lens frame 3, and the adhesion auxiliary member 4 and the lens side surface 2c are disposed. The lens 2 and the lens frame 3 are fixed with the applied adhesive 5A.
At that time, the adhesive 5A can be easily applied by introducing the adhesive 5A from the opening of the adhesive introduction hole 3e which is wider than the necessary thickness of the adhesive 5A. Moreover, a part of the introduced adhesive introduction hole 3e is eliminated by the adhesion auxiliary member 4, and the volume of the adhesive 5A used for adhesion is reduced. Thereby, the position shift and distortion of the lens 2 resulting from hardening shrinkage | contraction of the adhesive agent 5A can be suppressed easily.
The lens unit 1 assembled in this way has good optical performance because the positional shift and distortion of the lens 2 are suppressed.

[First Modification]
A lens assembly of a modified example (first modified example) of the present embodiment will be described.
FIG. 8A is a schematic plan view showing an example of the configuration of a lens assembly of a modified example (first modified example) of the first embodiment of the present invention. FIG.8 (b) is EE sectional drawing in Fig.8 (a).

As shown in FIGS. 8A and 8B, the lens unit 11 (lens assembly) of the present embodiment is replaced with an adhesion auxiliary member 4 in place of the adhesion auxiliary member 4 of the lens unit 1 of the first embodiment. 14.
Hereinafter, a description will be given centering on differences from the first embodiment.

The bonding auxiliary member 14 is a soft solid round shaft-like elastic member, whereas the bonding auxiliary member 4 of the first embodiment is a soft hollow tube, and each adhesive is introduced. The difference is that a plurality of holes 3e are arranged.
For this reason, the auxiliary bonding member 14 has a smaller diameter than the outer diameter of the auxiliary bonding member 4.
As the length of the adhesion assisting member 14, an appropriate dimension equal to or less than the length of the adhesion assisting member 4 can be adopted.
The number of adhesion assisting members 14 arranged is the number that can eliminate the adhesive 5A having a volume equal to or larger than that of the adhesion assisting member 4 of the first embodiment in the adhesive introduction hole 3e according to the outer shape of the adhesion assisting member 14. Decide.

  As the material of the adhesion assisting member 14, a silicon resin similar to that of the adhesion assisting member 4 or a resin material having a lower rigidity can be employed.

The lens unit 11 of this modification can be assembled by an assembly method substantially similar to the assembly method of the lens assembly of the first embodiment.
The assembling method of the lens assembly according to the present modification is the same as that of the lens assembly of the first embodiment except that a plurality of adhesion assisting members 14 are disposed in place of the adhesion assisting member 4 in the lens disposing step. It is the same as the assembly method.

According to the lens unit 11 of this modified example, the adhesion auxiliary member 4 of the first embodiment is replaced with a plurality of adhesion auxiliary members 14. The adhesion auxiliary member 14 can be deformed by eliminating a part of the adhesive 5A in the adhesive introduction hole 3e and reducing the volume of the adhesive 5A used for adhesion, and by an external force acting from the adhesive 5A. In the point which is an elastic member, it has the effect | action similar to the adhesion auxiliary member 4.
For this reason, as in the first embodiment, it is easy to apply the adhesive when the lens is bonded to the lens frame, and it is possible to easily suppress the displacement and distortion of the lens due to the curing shrinkage of the adhesive. can do.
Furthermore, according to this modification, since a plurality of the auxiliary bonding members 14 are arranged in one adhesive introduction hole 3e, the amount of the adhesive 5A accommodated in the adhesive introduction hole 3e can be easily set by the number of the auxiliary adhesion members 14. Can be changed.

[Second Embodiment]
A lens assembly according to a second embodiment of the present invention will be described.
FIG. 9A is a schematic plan view showing an example of the configuration of the lens assembly according to the second embodiment of the present invention. FIG.9 (b) is FF sectional drawing in Fig.9 (a).

As shown in FIGS. 9A and 9B, the lens unit 21 (lens assembly) of the present embodiment includes a lens frame 23 instead of the lens frame 3 of the lens unit 1 of the first embodiment. The adhesion auxiliary member 4 is deleted. The lens frame 23 includes a frame portion 23 </ b> A instead of the frame portion 3 </ b> A of the lens frame 3.
Hereinafter, a description will be given centering on differences from the first embodiment.

The frame portion 23A is different from the frame portion 3A in that an adhesion auxiliary protrusion 24 (adhesive regulating portion, convex portion) is formed.
The adhesion auxiliary protrusion 24 is a convex portion formed to protrude from the bottom surface portion 3c of each adhesive introduction hole 3e into the adhesive introduction hole 3e.
Similar to the adhesion assisting member 4 of the first embodiment, the adhesion assisting protrusion 24 can adopt an appropriate shape that can regulate the amount of the adhesive 5A accommodated in the adhesive introduction hole 3e.
In the present embodiment, as an example, in the intermediate portion between the lens side surface 2c of the lens 2 inserted in the inner peripheral surface 3a and the radial wall surface portion 3f, the height from the bottom surface portion 3c is slightly higher than the height of the radial wall surface portion 3f. The wall body protrudes to a low height and extends in an arc shape concentric with the radial wall surface portion 3f. For this reason, the upper end surface 24b in the protruding direction of the auxiliary bonding protrusion 24 is in a position retracted inward from the axial end of the opening of the adhesive introduction hole 3e.

  A radial gap between the inner peripheral surface 24a, which is the radially inner side surface of the auxiliary bonding protrusion 24, and the lens side surface 2c of the lens 2 inserted into the inner peripheral surface 3a is between the inner peripheral surface 24a and the lens side surface 2c. Even if the adhesive 5 </ b> A introduced therebetween is cured and shrunk, the lens 2 is set to a dimension in which the positional deviation and distortion of the lens 2 are within an allowable range.

  In the example shown in FIG. 9A, both end portions in the circumferential direction of the adhesion assisting protrusion 24 are connected to the circumferential wall surface portion 3g. However, this is an example, and it is not essential that the circumferential end of the adhesion assisting protrusion 24 is connected to the circumferential wall surface 3g. For example, a gap serving as a flow path for the adhesive 5A may be formed between at least one of the circumferential end portions of the adhesion assisting protrusion 24 and the circumferential wall surface portion 3g.

  The auxiliary bonding protrusions 24 are made of the same material as the lens frame 23. For this reason, in the adhesion auxiliary projection 24, deformation due to an external force acting when the adhesive 5A is cured and contracted can be ignored.

With such a configuration, in the lens unit 21 of the present embodiment, the auxiliary bonding protrusion 24 is formed between the radial wall surface portion 3f and the lens side surface 2c of the lens 2 inserted into the inner peripheral surface 3a in the adhesive introduction hole 3e. The adhesive regulating portion is disposed between and above the bottom surface portion 3c of the adhesive introduction hole 3e, and regulates the accommodation amount of the adhesive 5A.
This embodiment is an example in which the adhesive restricting portion is integrally formed in the adhesive introduction hole 3e.

The lens unit 21 of this embodiment can be assembled by the method of assembling the lens assembly of the present embodiment that is substantially the same as the method of assembling the lens assembly of the first embodiment.
The assembling method of the lens assembly according to the present embodiment includes a lens arranging step, an adhesive introducing step, a lens position adjusting step, and an adhesive curing step, and performing these steps in this order.
Hereinafter, a description will be given centering on differences from the first embodiment.

  The lens arrangement step of the present embodiment is different from the first embodiment in that the lens frame 23 in which the auxiliary bonding protrusion 24 is formed in advance in each adhesive introduction hole 3e is used.

The adhesive introduction process of the present embodiment is different only in that the adhesive 5A is introduced so as to cover a part or all of the adhesion assisting protrusion 24 between the radial wall surface portion 3f and the lens side surface 2c.
In the present embodiment, when the adhesive 5A is introduced from the opening in the axial direction of the adhesive introduction hole 3e, the adhesive 5A is arranged so as to straddle the adhesion auxiliary protrusion 24. For this reason, the upper end surface of the adhesion auxiliary protrusion 24 The adhesive 5A that has reached 24b is distributed to the inside and outside in the radial direction of the auxiliary bonding protrusion 24 and flows down, and is filled in the adhesive introduction hole 3e. The air in the gaps on the inner and outer sides in the radial direction of the auxiliary bonding protrusions 24 is pushed out in the circumferential direction as the adhesive 5A enters the gap.
When the adhesive 5A is filled inside or outside in the radial direction of the adhesion auxiliary projection 24, the adhesive 5A moves beyond the upper end surface 24b of the adhesion auxiliary projection 24 to the opposite side in the radial direction. Thus, by forming the flow path of the adhesive 5A on the upper end surface 24b, the balance of the filling amount of the adhesive 5A between the radially inner side and the outer side is maintained with the adhesion auxiliary protrusion 24 interposed therebetween. For this reason, the filling amount of the adhesive 5A between the inner peripheral surface 24a of the auxiliary bonding protrusion 24 and the lens side surface 2c can be stabilized.

  In addition, when the clearance gap used as the flow path of the adhesive agent 5A is formed between the circumferential direction edge part of the adhesion auxiliary protrusion 24, and the circumferential wall surface 3g, the adhesive agent 5A flows through the clearance gap. Also by this, the balance of the filling amount of the adhesive 5 </ b> A on the radially inner side and the outer side of the auxiliary bonding protrusion 24 can be kept good.

The lens position adjustment process and the adhesive curing process of this embodiment are both the same processes as the lens position adjustment process and the adhesive curing process of the first embodiment.
However, in the present embodiment, the adhesion assisting protrusion 24 is made of a hard material, and the deformation of the adhesion assisting protrusion 24 due to an external force acting when the adhesive 5A is cured and contracted can be ignored.
Therefore, in the adhesive curing process of the present embodiment, the gap between the adhesion assisting protrusion 24 and the lens side surface 2c is set in advance to a dimension that allows the distortion of the adhesive cured body 5 to be within an allowable range.

According to the lens unit 21 of the present embodiment, the accommodation amount of the adhesive 5A introduced into the axial opening of the adhesive introduction hole 3e is regulated by the adhesion auxiliary protrusion 24, and the lens side surface 2c, the inner peripheral surface 24a, The layer thickness of the adhesive 5A introduced between the two is regulated. Thereby, the layer thickness of the adhesive 5A bonded to the lens side surface 2c is regulated, and the distortion of the adhesive cured body 5 due to curing shrinkage is reduced.
Further, even when the adhesive 5A is introduced, for example, by dropping it in a range wider than the gap between the inner peripheral surface 24a and the lens side surface 2c, the adhesive 5A wraps around and around the auxiliary bonding protrusion 24 to Filling is performed between the surface 24a and the lens side surface 2c. For this reason, the adhesive 5A and the application work are facilitated.
As described above, according to the assembling method of the lens assembly of the present embodiment, it is easy to apply the adhesive when the lens is bonded to the lens frame, and the lens is displaced and distorted due to the curing shrinkage of the adhesive. Can be easily suppressed.
The lens unit 21 assembled in this way has good optical performance because the positional shift and distortion of the lens 2 are suppressed.
Furthermore, according to this embodiment, since the auxiliary bonding protrusions 24 are formed on the lens frame 23 in advance, the lens arrangement process is simplified.

[Third Embodiment]
A lens assembly according to a third embodiment of the present invention will be described.
FIG. 10A is a schematic plan view showing an example of the configuration of the lens assembly according to the third embodiment of the present invention. FIG.10 (b) is GG sectional drawing in Fig.10 (a).

As shown in FIGS. 10A and 10B, the lens unit 31 (lens assembly) of the present embodiment includes a lens frame 33 instead of the lens frame 23 of the lens unit 21 of the second embodiment. . The lens frame 33 includes a frame portion 33A instead of the frame portion 23A of the lens frame 23.
Hereinafter, a description will be given focusing on differences from the second embodiment.

The frame portion 33A includes an adhesion assist projection 34 (adhesive regulating portion, convex portion) instead of the adhesion assist projection 24 of the frame portion 23A.
The auxiliary bonding protrusion 34 is a convex portion that protrudes inward in the radial direction from the radial wall surface portion 3f and protrudes in the axial direction from the bottom surface portion 3c.
An inner peripheral surface 24 a similar to the adhesion auxiliary protrusion 24 is formed on the inner side in the radial direction of the adhesion auxiliary protrusion 34.
An upper end surface 34b made of a plane orthogonal to the central axis C is formed at the tip in the axial protruding direction of the auxiliary bonding protrusion 34 at a height slightly lower than the height of the radial wall surface portion 3f.
For this reason, the adhesion auxiliary projection 34 extends the upper end surface 24b of the adhesion auxiliary projection 24 of the second embodiment to the radial wall surface portion 3f, and the diameter between the radial wall surface portion 3f and the adhesion auxiliary projection 24 is increased. It has the same shape as filling the gap on the outside in the direction. However, the height of the upper end surface 34b may be the same as or different from the upper end surface 24b.
Similar to the adhesion assisting protrusion 24, the circumferential end of the adhesion assisting protrusion 34 may not be connected to the circumferential wall surface 3g.

  The adhesion auxiliary projection 34 is made of the same material as the lens frame 23. For this reason, in the adhesion auxiliary projection 34, deformation due to an external force acting when the adhesive 5A is cured and contracted can be ignored.

With such a configuration, in the lens unit 21 of the present embodiment, the auxiliary bonding protrusion 24 is formed between the radial wall surface portion 3f and the lens side surface 2c of the lens 2 inserted into the inner peripheral surface 3a in the adhesive introduction hole 3e. The adhesive regulating portion is disposed between and above the bottom surface portion 3c of the adhesive introduction hole 3e, and regulates the accommodation amount of the adhesive 5A.
This embodiment is an example in which the adhesive restricting portion is integrally formed in the adhesive introduction hole 3e.

The lens unit 31 of this embodiment can be assembled by the assembly method of the lens assembly of the present embodiment that is substantially the same as the assembly method of the lens assembly of the second embodiment.
The assembling method of the lens assembly according to the present embodiment includes a lens arranging step, an adhesive introducing step, a lens position adjusting step, and an adhesive curing step, and performing these steps in this order.
Hereinafter, a description will be given focusing on differences from the second embodiment.

  The lens arrangement process of the present embodiment is different from the second embodiment in that the lens frame 33 in which the adhesion auxiliary protrusion 34 is formed in advance in each adhesive introduction hole 3e is used.

  The adhesive introduction process of the present embodiment is different in that the adhesive 5A is dropped and introduced onto the upper end surface 34b of the adhesion auxiliary protrusion 34. However, the dripping amount of the adhesive 5 </ b> A is reduced by the amount that the volume of the adhesive introduction hole 3 e is further reduced by the adhesion auxiliary protrusion 34.

In this embodiment, when the adhesive 5 </ b> A is introduced from the opening in the axial direction of the adhesive introduction hole 3 e, the adhesive 5 </ b> A is dropped onto the adhesion assist protrusion 34. The upper end surface 34b of the auxiliary bonding protrusion 34 is dammed to the radial wall surface 3f on the radially outer side. For this reason, the adhesive 5 </ b> A moves radially inward as the dripping amount increases. As a result, the adhesive 5A flows down along the inner peripheral surface 24a and fills the gap between the inner peripheral surface 24a and the lens side surface 2c. The air in the gap between the inner peripheral surface 24a and the lens side surface 2c is pushed out in the circumferential direction as the adhesive 5A enters the gap.
In the present embodiment, as described above, the adhesive 5A is pushed out as the amount of the adhesive 5A dripped on the upper end surface 34b increases, and the weight of the adhesive 5A causes the inner peripheral surface 24a and the lens side surface 2c to move. The adhesive 5A is filled in the gaps between them.

  The lens position adjustment process and the adhesive curing process of this embodiment are both the same processes as the lens position adjustment process and the adhesive curing process of the second embodiment.

According to the lens unit 31 of this modification, the accommodation amount of the adhesive 5A introduced into the axial opening of the adhesive introduction hole 3e is regulated by the adhesion auxiliary protrusion 34, and the lens side surface 2c, the inner peripheral surface 24a, The layer thickness of the adhesive 5A introduced between the two is regulated.
As a result, even if the adhesive 5A is dropped in a range wider than the gap between the inner peripheral surface 24a and the lens side surface 2c, the adhesive is extruded radially inward along the upper end surface 34b of the auxiliary bonding protrusion 34. 5A is filled between the inner peripheral surface 24a and the lens side surface 2c. For this reason, the adhesive 5A and the application work are facilitated.
As described above, according to the assembling method of the lens assembly of the present embodiment, it is easy to apply the adhesive when the lens is bonded to the lens frame, and the lens is displaced and distorted due to the curing shrinkage of the adhesive. Can be easily suppressed.
The lens unit 31 assembled in this way has good optical performance because the positional shift and distortion of the lens 2 are suppressed.
In addition, since the auxiliary bonding protrusion 34 is formed in the lens frame 33 in advance, the lens arrangement process is simplified as in the second embodiment.

  In the description of each of the above embodiments and the first modification, the lens assembly assembling method has been described as an example in which the lens 2 includes a lens position adjusting step for adjusting the position of the lens 2 in the axial direction and the radial direction. However, the lens position adjustment may be a position adjustment in only one of the axial direction and the radial direction. When the axial position adjustment is not performed, the bottom surface portion 3c of each lens frame is used as an axial alignment surface of the lens 2.

In the description of each of the embodiments and the first modified example, the lens assembly assembling method has been described as an example in which the lens position adjusting step is provided. However, when the lens can be positioned only by inserting the lens into the lens insertion hole of the lens frame, the lens position adjustment step can be omitted.
In particular, when the lens position adjustment in the radial direction is not performed, the radial gap between the side surface of the lens and the lens insertion hole is extremely narrow. For this reason, it is difficult to directly fill the gap with the adhesive. However, in the present invention, by providing the adhesive introduction hole and the adhesive restricting portion, a gap wider than the gap between the lens side surface and the lens insertion hole is formed, and the lens side surface and the adhesive restricting portion are formed. In the meantime, it is possible to introduce the required amount of adhesive.

  In the description of each of the above embodiments and the first modification, the example in the case where the adhesive curing step is performed after the lens position adjustment step has been described. However, the adhesive curing step may be performed in parallel with the lens position adjustment step as long as the viscosity capable of moving the lens 2 can be maintained for the time necessary for the lens position adjustment.

  In the description of the first embodiment, the example in which the adhesion assisting member 4 is made of a soft hollow tube has been described. However, the shape of the adhesion assisting member 4 is not limited thereto. For example, the cross-sectional shape of the hollow tube may be circular or polygonal. Further, the adhesion assisting member 4 may have a shape such as a solid shaft having a cross-sectional shape such as a circular shape, an elliptical shape, or a polygonal shape as long as it has appropriate elasticity.

  In the description of the first modification, the example in which the adhesion assisting member 14 is made of a soft solid round shaft member has been described, but the shape of the adhesion assisting member 14 is not limited thereto. For example, a hollow tube shape, a solid or hollow spherical shape, a solid or hollow polygonal column shape, and the like are possible.

  In the description of each of the above embodiments and the first modification, the opening shape in the axial direction of the adhesive introduction hole 3e is a substantially square groove-shaped opening shape including the radial wall surface portion 3f and the circumferential wall surface portion 3g. As described in the example, the opening shape of the adhesive introduction hole is not limited to this. The opening shape in the axial direction of the adhesive introduction hole may be other shapes such as an arc shape and a polygonal shape, for example.

In the description of the second and third embodiments, the example in which the adhesion auxiliary protrusions 24 and 34 are integrally formed of the same material as the lens frames 23 and 33 has been described. The auxiliary protrusions 24 and 34 may be formed by being attached to the adhesive introduction hole 3e.
In this case, the adhesion assisting protrusions 24 and 34 may be made of an elastic material that can be deformed by an external force due to curing shrinkage of the adsorption cylinder 5a. In this case, the adhesion assisting protrusions 24 and 34 can also be configured with a hollow structure that is more easily deformed.

In the description of the third embodiment, an example in which the upper end surface 34b of the auxiliary bonding protrusion 34 is a plane perpendicular to the central axis C has been described, but the shape of the upper end surface 34b is not limited to this.
For example, the upper end surface of the auxiliary bonding protrusion 34 can be a flat surface or a curved surface that is inclined from the radially outer side toward the inner side toward the bottom surface portion 3c. In this case, the adhesive 5A dropped on the upper end surface easily flows toward the inner peripheral surface 24a due to its own weight.

  In the description of each of the above embodiments and the first modification, the adhesive 5A has been described as causing curing shrinkage. However, the adhesive 5A may be an adhesive that expands during curing. In this case as well, distortion occurs in the cured adhesive body 5 after curing, but if the adhesive layer becomes thinner, the influence of distortion and displacement of the lens 2 is reduced. When the adhesive restricting portion is made of an elastic member, it is possible to reduce or eliminate the influence of distortion by compressing and deforming.

  All the constituent elements described above can be implemented by appropriately changing or deleting combinations within the scope of the technical idea of the present invention.

1, 11, 21, 31 Lens unit (lens assembly)
2 Lens 2a First lens surface 2b Second lens surface 2c Lens side surfaces 3, 23, 33 Lens frame 3a Inner peripheral surface (lens insertion hole)
3c Bottom (lens insertion hole)
3e Adhesive introduction hole 3f Radial wall surface (outermost wall surface)
3g circumferential wall surface parts 4 and 14 Adhesion auxiliary member (adhesive regulating part, elastic member)
5 Adhesive Cured Body 5A Adhesive 6 Syringe 7 Suction Device 8 Lens Frame Holding Bases 24, 34 Adhesion Auxiliary Protrusion (Adhesive Restricting Part, Convex Part)
24a Inner peripheral surface C Center axis O Lens optical axis

Claims (8)

A lens,
In order to introduce an adhesive into a lens insertion hole into which the lens is inserted and a side surface of the lens inserted into the lens insertion hole, the lens insertion is performed in a region extending radially outward from the inner peripheral surface of the lens insertion hole. An adhesive introduction hole having an opening that opens in the axial direction of the hole;
In the adhesive introduction hole, the adhesive is disposed between the outermost wall surface portion and the side surface of the lens inserted into the lens insertion hole and above the deepest bottom surface portion of the adhesive introduction hole. An adhesive regulation section that regulates the amount of
In the adhesive introduction hole, an adhesive cured body that is formed by curing at least an adhesive applied between the adhesive regulating portion and the side surface of the lens, and fixes the side surface of the lens and the lens frame. When,
A lens assembly. The adhesive regulating part is
The lens assembly according to claim 1, wherein an adhesion auxiliary member different from the adhesive is introduced from the opening of the adhesive introduction hole. The adhesion auxiliary member is
The lens assembly according to claim 2, comprising an elastic member that can be deformed by a force acting on the adhesive when the adhesive is cured. The adhesion auxiliary member is
The lens assembly according to claim 2, wherein the lens assembly includes a hollow tube. The adhesive regulating part is
The lens assembly according to claim 1, wherein the lens assembly is configured by a convex portion that protrudes into the adhesive introduction hole. A lens assembly assembly method for forming a lens assembly by bonding a lens to a lens frame,
In the lens frame, in the adhesive introduction hole having an opening portion opened in the axial direction of the lens insertion hole in a region extending radially outward from the inner peripheral surface of the lens insertion hole in which the lens is disposed, the outermost wall surface portion And the side surface of the lens inserted into the lens insertion hole and above the deepest bottom surface portion of the adhesive introduction hole to form an adhesive regulating portion that regulates the amount of adhesive accommodated And
Disposing the lens in the lens insertion hole;
A lens placement process including:
In the adhesive introduction hole, an adhesive introduction step of introducing the adhesive between at least the adhesive regulating portion and the side surface of the lens;
An adhesive curing step of curing the adhesive introduced into the adhesive introduction hole and fixing a side surface of the lens and the lens frame;
A method for assembling a lens assembly. In the lens placement step,
The lens assembly assembly according to claim 6, wherein the adhesive restricting portion is formed by introducing an auxiliary bonding member different from the adhesive from the opening of the adhesive introducing hole. Method. Between the end of the adhesive introduction step and the end of the adhesive curing step,
The method of assembling a lens assembly according to claim 6, further comprising a lens position adjustment step of adjusting the position of the lens with respect to the lens frame by moving the lens.

Images