WO2009119192A1

WO2009119192A1 - Cemented lens array, cemented lens and method for producing cemented lens array

Info

Publication number: WO2009119192A1
Application number: PCT/JP2009/052766
Authority: WO
Inventors: 和道谷
Original assignee: コニカミノルタオプト株式会社
Priority date: 2008-03-26
Filing date: 2009-02-18
Publication date: 2009-10-01

Abstract

Provided is a cemented lens array wherein positioning can be performed relatively easily yet highly accurately with regard to the optical axes and the distance between the curved surfaces of optical curved surfaces while a degradation in optical performance due to the diffusion of adhesive can be limited. Also provided is a method for producing a cemented lens array, and a cemented lens formed of a cemented lens array. An abutting planar portion (CLa) coated with adhesive (BD) and an abutting surface (CL) are made to abut on each other and, at the same time, a side surface portion (CPa) and a fitting surface portion (CP) are fitted to each other, thus performing relative positioning. Subsequently, a first lens array (1) and a second lens array (2) thus positioned are bonded by curing the adhesive (BD). Seeped-out adhesive (BD) stays in an adhesive sump (BA), and cures in the adhesive sump (BA) during a bonding process without affecting a lens element (LP1).

Description

Bonded lens array, cemented lens, and method of manufacturing cemented lens array

The present invention relates to a cemented lens array joined by stacking lens arrays, a cemented lens formed from the cemented lens array, and a method of manufacturing the cemented lens array.

A cemented lens array obtained by laminating and cementing a plurality of lens arrays having a plurality of optical curved surfaces is known (see Patent Document 1). In this cemented lens array, a plurality of key protrusions and convex portions, and a plurality of key grooves and concave portions that fit into the plurality of key protrusions and convex portions are arranged on a pair of lens arrays that are arranged to face the upper side and the lower side. Are provided to achieve positioning between the lens arrays (see above).
Japanese Patent Laid-Open No. 2003-329808

However, when the lens array is joined and positioned by providing and fitting a plurality of concave and convex portions, for example, errors in the concave and convex portions may be stacked, resulting in a larger error as a whole. Further, if the shape of the uneven portion for positioning becomes complicated, there is a risk that manufacturing costs may be increased. Further, when the shape of the uneven portion becomes complicated and the ratio of the uneven portion in the lens array increases, the integration density of the lens array becomes low. Another problem is that, particularly when the cemented lens array is for a small lens, the portion where the plurality of lens arrays are joined and the optical surface are relatively close to each other, so an adhesive is used for joining. In such a case, the adhesive may diffuse into an optical surface such as a lens surface portion of the lens array, thereby degrading the optical performance.

Therefore, in the present invention, the lens array and the other optical array can be accurately positioned in the optical axis direction, and the portion where the lens array and the other optical array are joined is close to the optical surface of the lens array. However, it is an object of the present invention to provide a cemented lens array that can suppress a decrease in optical performance due to diffusion of an adhesive, a cemented lens formed from the cemented lens array, and a method of manufacturing the cemented lens array.

In order to solve the above problems, a cemented lens array according to the present invention is a cemented lens array formed by stacking a plurality of optical arrays including a lens array, and each of a plurality of lens surfaces constituting the lens array. Each of which is in contact with another optical array adjacent to the lens array with respect to the optical axis direction with an adhesive interposed between the lens array and the other optical array. The abutting flat surface portion for relative positioning, and at least one of the lens array and the other optical array is formed in a region sandwiched between each abutting flat surface portion and each lens surface. And an adhesive reservoir portion that accumulates an adhesive that oozes out as a surplus from the abutting flat surface portion by positioning in the optical axis direction.

In the above cemented lens array, relative positioning in the optical axis direction between the lens array and the other optical array is performed by the abutting flat surface portion. Thereby, although it is a comparatively simple structure, positioning of each optical array, such as a lens array, in the optical axis direction can be performed with high accuracy. Further, in the above-mentioned cemented lens array, the adhesive reservoir portion stores the adhesive that oozes out as a surplus during positioning, thereby suppressing a decrease in optical performance due to the diffusion of the adhesive, and the lens surface of the lens array. It is possible to increase the integration density.

In a specific aspect of the present invention, each abutting flat surface portion is provided between each peripheral portion of the plurality of lens surfaces of the lens array and each contact portion of the other optical array that contacts the peripheral portion. A concave-convex fitting that is formed as a pair of convex portions and concave portions on the outer side of the lens so as to allow the lens array and the other optical array to be fitted together and to perform relative positioning in the direction perpendicular to the optical axis by the fitting. It further comprises a joint part.

In this case, relative positioning in the optical axis direction between the lens array and the other optical array is performed by the abutting flat portion, and the lens array and the other optical array are fitted by the concave / convex fitting portion. The relative positioning in the direction perpendicular to the optical axis is performed. This enables highly accurate positioning of the optical surface of each optical array such as a lens array and the distance between the curved surfaces, while having a relatively simple structure that uses both concave and convex fitting and flat contact. It can be carried out. Further, by adopting a simple structure in which one lens element constituting the lens array is fitted by one set of projections and depressions, the allowable error range in the fitting of the one set of projections and depressions can be reduced, and positioning can be performed. Higher accuracy can be achieved. In addition, each abutting plane part is provided in proximity to each concave-convex fitting part, so that the ratio of the space for joining in the lens array can be reduced.

In another specific aspect of the present invention, the uneven fitting portion is formed including the abutting flat surface portion and a side surface extending from an outer edge portion of the abutting flat surface portion.

In this case, one of the concave portion or the convex portion of the concave-convex fitting portion is formed by forming the convex portion or the concave portion by the abutting flat portion and the side surface corresponding to the outer edge portion.

In yet another specific aspect of the present invention, the plurality of optical arrays include a first lens array corresponding to the lens array and a second lens array corresponding to the other optical array, and the abutting plane. And the concave / convex fitting portion perform relative positioning with respect to the plurality of lens surfaces of the first lens array and the plurality of lens surfaces of the second lens array, respectively. .

In this case, positioning of the optical surface of the optical curved surface and the distance between the curved surfaces between the plurality of lens arrays can be performed with high accuracy.

In still another aspect of the present invention, the plurality of optical arrays include a diaphragm array having a plurality of diaphragms corresponding to the plurality of lens surfaces.

In this case, relative positioning between each lens surface of the lens array and each diaphragm of the diaphragm array corresponding to the lens surface can be performed with high accuracy.

In still another aspect of the present invention, the uneven fitting portion has a cylindrical shape.

This makes it possible to easily perform an alignment operation for relative positioning in the optical axis vertical direction.

In still another aspect of the present invention, the concave / convex fitting portion is formed in a tapered shape.

In this case, relative positioning in the direction perpendicular to the optical axis can be performed by bringing a pair of convex portions and tapered surfaces formed in the concave portions into contact with each other.

In still another aspect of the present invention, the concave / convex fitting portion is provided with a predetermined play between a pair of convex portions and concave portions.

In this case, by providing the play, in the relative positioning in the vertical direction of the optical axis, the adjustable range in the alignment operation can be increased, and for example, when the uneven fitting portion is tapered In addition, the other optical array can be reliably brought into contact with the abutting flat surface portion.

In still another aspect of the present invention, the adhesive reservoir is formed by a stepped groove having a height of 0.03 mm to 0.05 mm and a width of 0.1 mm to 0.2 mm. It is characterized by that.

In this case, each adhesive reservoir has a size sufficient to reliably store the adhesive without overflowing, and can suppress a decrease in optical performance due to the diffusion of the adhesive, and the adhesive reservoir. Therefore, the size of the cemented lens array, that is, the size of the individual cemented lenses can be kept within a range that does not become too large.

In yet another aspect of the present invention, the width of the bonding portion of the abutting flat surface portion is 1/6 or more and 1/4 or less with respect to the width of one lens unit.

In this case, the adhesive force at the bonding portion of each abutting flat surface portion can be maintained sufficiently, and the size of the cemented lens array, that is, the size of the individual cemented lenses can be kept within a range that does not become too large. To do.

As a specific aspect of the present invention, the cemented lens according to the present invention is formed by cutting out from any one of the above-described cemented lens arrays, and is formed by the lens surface of the lens array and a peripheral portion of the lens surface. It is characterized by comprising a lens part and an optical element bonded by an adhesive adjacent to the lens part in the other optical array.

In this case, since the cemented lens is formed from any one of the above-described cemented lens arrays, the positioning of the optical surface of the optical curved surface and the distance between the curved surfaces of each optical element such as a lens surface is highly accurate. Moreover, the deterioration of the optical performance due to the diffusion of the adhesive is also suppressed.

In order to solve the above problems, a method for manufacturing a cemented lens array according to the present invention is a method for manufacturing a cemented lens array formed by stacking a plurality of optical arrays including a lens array, and constitutes the lens array. An adhesive supplying step of supplying an adhesive between a peripheral portion of the lens surface and a contact portion of another optical array that contacts the peripheral portion; and provided in a peripheral portion of the lens surface of the lens array. A positioning step including a first positioning step of performing relative positioning in the optical axis direction between the lens array and the other optical array by an abutting flat surface portion that abuts against a contact portion of the other optical array; The adhesive applied between the lens array and the other optical array is cured to bond the positioned lens array and the other optical array. A bonding step, and in the positioning step, the adhesive that oozes out as a surplus from the abutting plane portion is the abutting plane portion and the lens surface in at least one of the lens array and the other optical array. It is stored in the adhesive reservoir part formed in the area | region pinched | interposed between.

In the method for manufacturing a cemented lens array, first, in the first positioning step, relative positioning in the optical axis direction between the lens array and another optical array is performed by the abutting flat surface portion. Thereby, although it is a comparatively simple structure, it can position with respect to the distance between curved surfaces of the optical curved surface of each optical array, such as a lens array, with high precision. Further, in the positioning step, by storing the adhesive that oozes out as a surplus during positioning by the adhesive reservoir, it is possible to suppress a decrease in optical performance due to the diffusion of the adhesive.

In a specific aspect of the present invention, the positioning step is performed on the outer side from the abutting plane portion between each peripheral portion of the plurality of lens surfaces of the lens array and each contact portion of the other optical array. An optical axis perpendicular direction of the lens array and the other optical array is formed by a concave / convex fitting portion that is formed as a pair of convex portions and concave portions, respectively, and enables the lens array and the other optical array to be fitted to each other. It further has the 2nd positioning process which carries out relative positioning about.

In this case, in the first positioning step, relative positioning in the optical axis direction between the lens array and the other optical array is performed by the abutting flat surface portion. Further, in the second positioning step, a plurality of uneven fitting portions As a result, the lens array and the other optical array are fitted together, and relative positioning in the direction perpendicular to the optical axis is performed. As a result, the positioning of the optical surface of the optical curved surface and the distance between the curved surfaces of each optical array, such as a lens array, is highly accurate while having a relatively simple structure using both concave and convex fitting and flat contact. Can be done.

(A)-(c) is a figure explaining the cemented lens array which concerns on 1st Embodiment. It is a perspective view which shows the optical array which comprises a cemented lens array. (A), (b) is a figure explaining the structure of a cemented lens. (A)-(d) is sectional drawing for demonstrating the manufacturing method of a junction lens array. It is sectional drawing which shows the cemented lens array which concerns on 2nd Embodiment. (A), (b) is a top view which shows the cemented lens array which concerns on 3rd Embodiment. (A)-(d) is the elements on larger scale which show the cemented lens array which concerns on 4th Embodiment. It is sectional drawing of a cemented lens array. It is sectional drawing of a cemented lens. It is sectional drawing of a cemented lens array. It is sectional drawing of a cemented lens.

Explanation of symbols

10, 110, 400, 500 ... cemented

lens array

10a, 40a, 50a ... cemented

lens

1, 42, 52 ...

first lens array

2, 44, 53 ...

second lens array

3, 45, 54 ... aperture array LP1, LP2 ... Lens element DP ... Diaphragm element CLa ... Abutting plane part CL ... Contact surface CPa ... Side part CP ... Fitting surface part BA ... Adhesive reservoir part

[First Embodiment]
FIGS. 1A to 1C are views for explaining the cemented lens array 10 according to the first embodiment and the cemented lens 10a cut out from the cemented lens array 10. FIG. FIG. 1A is a cross-sectional view of the cemented lens array 10, and FIGS. 1B and 1C are a cross-sectional view and a perspective view illustrating a state in which the cemented lens 10 a is cut out from the cemented lens array 10. .

As shown in FIG. 1A, the cemented lens array 10 has a three-layer structure in which an optical array including a first lens array 1, a second lens array 2, and a diaphragm array 3 is laminated. Although described in detail later, the

arrays

1, 2, and 3 are bonded to each other by an ultraviolet curable resin or the like. The

lens arrays

1 and 2 are each composed of a large number of lens elements LP1 and LP2, and the aperture array 3 is composed of a large number of aperture elements DP. Further, the lens elements LP1, the lens elements LP2, and the diaphragm elements DP are all connected by a peripheral portion SS. Further, a concave / convex fitting portion FP is formed for alignment between the lens element LP1 and the lens element LP2 and alignment between the lens element LP2 and the aperture element DP. In the cemented lens array 10, the cutting margin CO is a portion that is scraped during a cutting operation for cutting out the cemented lens 10 a from the cemented lens array 10. Here, various methods can be considered as a cutting method. For example, it is possible to perform cutting using an end mill tool. In this case, the width of the end mill tool to be used is the width of the cutting margin CO. As shown in FIGS. 1B and 1C, the cemented lens 10a is cut out in a cylindrical shape with the cutting line CT that is both ends of the cutting margin CO as a boundary portion, as shown in FIGS. 1B and 1C. . The cut-out cemented lens 10a has a three-layer structure in which a first lens portion 1a, a second lens portion 2a, and a diaphragm portion 3a corresponding to each of the

arrays

1, 2, and 3 of the cemented lens array 10 are stacked. The lens unit includes a pair of lens elements LP1 and LP2 and a diaphragm element DP. The cemented lens 10a is used as an optical component incorporated in an imaging device of a mobile phone or a camera. FIG. 2 is a perspective view showing the first lens array 1, the second lens array 2, and the aperture array 3 before being stacked. As illustrated, in the first lens array 1, the second lens array 2, and the aperture array 3, optical elements such as lens elements LP1 are arranged in a matrix at positions corresponding to each other on each plane.

3A and 3B are diagrams for explaining in detail the structure of the cemented lens 10a cut out from the cemented lens array 10, and FIG. 3A is a cross-sectional view of the cemented lens 10a. FIG. 3B is a plan view of the cemented lens 10a. As described above, the cemented lens 10a is composed of the first lens portion 1a composed of a transparent resin that transmits light, the second lens portion 2a that is also composed of a transparent resin, and a black resin that blocks light. It has a three-layer structure in which the constricted diaphragm portion 3a is laminated. Among these, first, the first lens portion 1a includes an abutting flat surface portion CLa and a side surface portion CPa in addition to the lens element LP1 which is a main optical element. The abutting flat surface portion CLa is a flat surface that is arranged in a ring shape around the lens surface LS1 of the lens element LP1 and is formed perpendicular to the optical axis AX. The side surface portion CPa is a side surface that extends perpendicularly to the abutting flat surface portion CLa from the outer edge portion of the abutting flat surface portion CLa and is formed in a cylindrical shape. That is, the side surface portion CPa forms a concave portion CC for fitting with the second lens portion 2a together with the abutting flat surface portion CLa. Next, in addition to the lens element LP2, which is the main optical element, the second lens portion 2a is a flat contact that is a contact portion that contacts the abutting flat surface portion CLa on the lower side in the drawing, that is, on the first lens portion 1a side. The contact surface CL and the fitting surface portion CP that is fitted to the side surface portion CPa are provided. That is, the fitting surface portion CP forms a convex portion CV for fitting with the first lens portion 1a together with the contact surface CL. As a result, the concave portion CC of the first lens portion 1a and the corresponding convex portion CV of the second lens portion 2a function as a pair of concave-convex fitting portions FP.

Also, a similar structure is formed between the second lens portion 2a and the aperture portion 3a. That is, the second lens portion 2a is formed in a cylindrical shape on the upper side in the drawing, that is, on the diaphragm portion 3a side, at the abutting flat portion CLa formed at the peripheral portion of the lens surface LS2 and at the end of the abutting flat portion CLa. And a side surface CPa. On the other hand, the diaphragm portion 3a includes a contact surface CL and a fitting surface portion CP corresponding to the abutting flat surface portion CLa and the side surface portion CPa on the lower side in the drawing, that is, the second lens portion 2a side. Thereby, a pair of concave and convex fitting portions FP to be fitted is formed also in the second lens portion 2a and the aperture portion 3a.

Further, in any of the contact surfaces CL of the second lens portion 2a and the diaphragm portion 3a, a region inside the contact portion, that is, a region sandwiched between the abutting flat surface portion CLa and the lens surfaces LS1 and LS2 is illustrated. In order to store the adhesive BD that oozes out as a surplus when the

arrays

1, 2, and 3 shown in FIG. Here, as the adhesive BD, an acrylic or epoxy ultraviolet curable adhesive is used here. The adhesive BD is cured by being irradiated with ultraviolet rays and exhibits an adhesive action.

Further, the diaphragm portion 3a includes a diaphragm element DP as a main optical element, and an opening PO is formed first from the tip portion DPe, and the lens element LP2 of the second lens portion 2a is exposed.

As described above, the cemented lens 10a has the three-layer structure in which the first lens portion 1a, the second lens portion 2a, and the diaphragm portion 3a are stacked, and the lens elements LP1, LP2 and the diaphragm element DP, which are main optical elements, are uneven. The fitting portion FP is configured to be aligned and fixed with the optical axis AX as a reference.

Hereinafter, a method for manufacturing the cemented lens array 10 and the cemented lens 10a according to the present embodiment will be described with reference to FIGS.

First, as shown in FIG. 4A, among a plurality of optical arrays, an adhesive BD is interposed between the first lens array 1 and the second lens array 2, and these are bonded. For this reason, first, the adhesive BD is applied to either the abutting flat surface portion CLa that is the contact location of the first lens array 1 or the side surface portion CPa that is the fitting location (adhesive supply step). Next, as shown in FIG. 4B, the first lens array 1 and the second lens array 2 are brought into contact with each other and fitted, and the alignment operation between the lens element LP1 and the lens element LP2 is performed. More specifically, first, the abutting flat surface portion CLa to which the adhesive BD is supplied is brought into contact with the contact surface CL, and at this time, the first lens array 1 and the second lens which is another optical array. Relative positioning in the direction of the optical axis AX with the array 2 is performed (first positioning step). At the same time, the side surface portion CPa and the fitting surface portion CP are fitted, and at this time, the relative positioning of the first lens array 1 and the second lens array 2 in the plane perpendicular to the direction of the optical axis AX is performed. (Second positioning step). Finally, the first lens array 1 and the second lens array 2 that have been positioned are joined by curing the adhesive BD that has been applied by irradiating ultraviolet rays (not shown) to the adhesion location (joining process). .

In the above case, the structure is a simple structure in which the lens element LP1 and the lens element LP2 are fitted by a set of concave / convex fitting portions FP disposed so as to surround them. Thereby, for example, compared with a case where a single lens element is fitted by a fitting portion in which a plurality of concaves and convexes are connected, a range of allowable errors in the set of concave and convex fitting portions FP, that is, the side surface portion CPa and the fitting surface portion CP. It is possible to reduce the play that can be made between the two, and the positioning can be made with higher accuracy.

Also, particularly when performing the first and second positioning steps, the surplus portion of the applied adhesive BD may protrude from the contact portion of the abutting flat surface portion CLa or the side surface portion CPa. Among these, the adhesive BD that has oozed out from the contact portion to the inside, that is, the lens surface LS1 side, accumulates in the adhesive reservoir BA, and inside the adhesive reservoir BA in the joining process without affecting the lens element LP1. Harden. Note that the adhesive BD that protrudes outward from the contact location accumulates in the gap GA between the

arrays

1, 2, and 3, and does not affect the lens element LP1.

Next, as shown in FIG. 4C, in the same manner as described above, the second lens array 2 and the aperture array 3 among the plurality of optical arrays are joined. That is, the abutting flat surface portion CLa and the side surface portion CPa of the second lens array 2 and the contact surface CL and the fitting surface portion CP of the corresponding diaphragm array 3 are respectively in a direction parallel to and perpendicular to the optical axis AX. While abutting and fitting in a state of being positioned with high accuracy, they are bonded to each other by an adhesive BD.

By cutting out from the cemented lens array 10 formed as described above with the cutting line CT as a boundary, the separated cemented lens 10a shown in FIG. 4D is formed. The lens elements LP1, LP2 and the diaphragm element DP, which are the main optical elements in the first lens section 1a, the second lens section 2a, and the diaphragm section 3a constituting the cemented lens 10a, are arranged with high accuracy as described above. It has become a thing.

Here, the cemented lens 10a has a height a with respect to the adhesive reservoir BA formed as a stepped groove with respect to the outer diameter D of the lens unit as shown in FIG. 4D, for example. However, it is desirable that the width be in the range of 1/40 to 1/100 and the width b be in the range of 1/30 to 1/10. In other words, various modes can be considered for the cemented lens 10a. For example, when the lens unit width D has a value of about 2 to 3 mm, the adhesive reservoir BA has a height. It is desirable that the value of a is in the range of 0.03 to 0.05 mm and the value of width b is in the range of 0.1 to 0.2 mm. As a result, the adhesive reservoir BA has a size large enough to reliably accumulate the adhesive without overflowing, and the optical performance of the lens element LP1 and the like due to diffusion of the adhesive BD can be suppressed. At the same time, the size of the joint portion including the adhesive reservoir BD can be prevented from increasing, and the size of the cemented lens 10 can be kept within the above range.

Further, with respect to the bonding portion between the abutting flat surface portions CLa and the contact surface CL, the size of the cemented lens 10a is maintained within the above range, and sufficient adhesive force at the bonding portion can be maintained. It is desirable that the width c of the bonded portion is in the range of 1/6 to 1/4 with respect to the lens unit width D.

Further, it is desirable that the adhesive BD has a viscosity value in the range of 500 to 2500 mPa · s so that it does not flow out from the adhesive reservoir BA and is suitable for workability.

[Second Embodiment]
Hereinafter, the cemented lens array and the manufacturing method thereof according to the second embodiment will be described with reference to the drawings. The cemented lens array 110 of the second embodiment is a modification of the cemented lens array 10 of the first embodiment.

FIG. 5 is an enlarged cross-sectional view of one unit of the cemented lens array 110. The cemented lens array 110 has a two-layer structure in which a lens array 101 and a diaphragm array 103 are laminated. The

arrays

101 and 103 are bonded by an adhesive BD that is an ultraviolet curable resin, as will be described in detail later. . One lens array 101 is configured by a lens element LP1, and the other aperture array 103 is configured by a diaphragm element DP having a stepped shape corresponding to the lens element LP1. Here, in the lens array 101, the abutting flat surface portion CLa is a flat surface that is formed in a ring shape in the peripheral portion SS of the lens element LP1 and is perpendicular to the optical axis AX. On the other hand, the side surface portion CPa ′ forms a tapered surface that spreads conically from the end of the abutting flat surface portion CLa. On the other hand, in the diaphragm array 103, correspondingly, the contact surface CL is formed flat so as to contact the abutting flat surface portion CLa, and the fitting surface portion CP ′ is formed on the side surface portion CPa ′. In order to fit, the taper-shaped surface which spreads similarly to side surface part CPa 'is formed. That is, the concave / convex fitting portion FP formed by the concave portion formed by the flat surface portion CLa and the side surface portion CPa ′ and the convex portion formed by the contact surface CL and the fitting surface portion CP ′ is fitted by the tapered surface. It has become.

Similarly to the method of manufacturing the cemented lens array 10 shown in FIG. 4 and the like, the cemented lens array 110 also has the flat surface portion CLa and the contact surface CL in contact with each other, and the side surface portion CPa ′ and the side surface portion formed in a tapered shape. By fitting with CPa, positioning with high accuracy in the optical axis AX direction is possible.

Further, in the case of the cemented lens array 110, an play with weak fitting may be formed by providing a slight gap between the side surface portion CPa and the fitting surface CP. Furthermore, a slight gap may be provided between the peripheral surface CQa ′ located outside the side surface portion CPa ′ and the corresponding peripheral surface CQa ′. By providing a slight gap at these locations, the amount by which the positional relationship between the lens array 101 and the aperture array 103 can be adjusted is increased, and the abutting flat surface portion CLa and the abutting surface CL can be reliably brought into contact with each other. it can.

Note that here, the cemented lens array 110 is cut out along a cutting line CT passing over the abutting flat surface portion CLa. In other words, the tapered surface formed by the fitting surface portion CP and the side surface portion CPa used for highly accurate alignment is included in the region of the cutting margin CO, and is joined after being cut out at the cutting line CT. It will not remain in the lens. However, also in this embodiment, the lens element LP1 and the diaphragm element DP, which are the main optical elements of the cemented lens cut out with the cutting line CT as a boundary, are tapered by the fitting surface portion CP and the side surface portion CPa. It is arranged with high accuracy in the direction perpendicular to the optical axis AX by alignment on the surface.

[Third Embodiment]
Hereinafter, the cemented lens array and the manufacturing method thereof according to the third embodiment will be described with reference to the drawings. The cemented lens array of the third embodiment is a modification of the cemented

lens arrays

10 and 110 of the first and second embodiments.

6 (a) and 6 (b) are plan views for explaining the cemented

lenses

210a and 310a cut out from the cemented lens array of the present embodiment, respectively. 6 (a) and 6 (b) correspond to the plan view of the cemented lens 10a shown in FIG. 3 (b). That is, the cemented lens 210a shown in FIG. 6A has a regular hexagonal shape when viewed from the outside, that is, the cutting line CT, and has a hexagonal column shape. Different. The cemented lens 310a shown in FIG. 6B is also different from the cemented lens 10a and the cemented lens 210a in that the appearance is a square in plan view and has a rectangular parallelepiped shape. In this case, regular hexagons and squares are figures that can be spread on a plane without any gaps. Therefore, the arrangement of

arrays

1, 2, and 3 shown in FIGS. It can be efficient. In addition, cutting using a straight cutting method is also possible. In the above description, the side surface portion CPa and the fitting surface portion CP corresponding to the side surface portion CPa may have a regular hexagonal shape in plan view.

[Fourth Embodiment]
Hereinafter, the cemented lens array according to the fourth embodiment and the manufacturing method thereof will be described with reference to the drawings. Since the cemented lens array according to the fourth embodiment is a modification of the cemented

lens arrays

10 and 110 according to the first to third embodiments, only the parts having different shapes will be described, and the other parts will be omitted.

FIGS. 7A to 7D are partially enlarged views showing modified examples of the cemented

lens arrays

10 and 110 according to the present embodiment.

First, FIG. 7A is a modified example of the cemented lens array 10, and the structure is different in that the adhesive reservoir BA is formed on the abutting flat surface CLa side. That is, in the example of FIG. 3 and the like, the adhesive reservoir BA is formed on the contact surface CL side, but instead of this, as shown in FIG. 7A, the protrusion corresponding to the contact surface CL. A similar adhesive reservoir portion BA may be provided in the contact flat portion CLa.

Next, FIG. 7B is a modified example of the cemented lens array 10, and the structure is different in that the relationship between the pair of concave portions and convex portions is reversed. That is, in the example of FIG. 4 and the like, the side surface portion CPa and the abutting flat surface portion CLa form the concave portion CC, and the fitting surface portion CP and the contact surface CL form the convex portion CV. Conversely, as shown in FIG. 7B, the side surface portion CPa and the abutting flat surface portion CLa may form a convex portion, and the fitting surface portion CP and the contact surface CL may form a concave portion. In addition to this, an adhesive reservoir BA may be provided on the abutting flat surface CLa side as shown in FIG.

Next, FIG. 7D is a modified example of the cemented lens array 110, in which the adhesive reservoir portion BA is formed on the abutting flat surface portion CLa side and the relationship between the pair of concave portions and convex portions is reversed. The structure is different. In other words, the cemented lens array 110 shown in FIG. 5 can be modified in the same manner as the modified examples shown in FIGS.
[Fifth Embodiment]
Hereinafter, a cemented lens array and a method for manufacturing the same according to a fifth embodiment will be described with reference to the drawings. FIG. 8 is a sectional view of the cemented lens array 400, and FIG. 9 is a sectional view of the cemented lens 40a.

The cemented lens array 400 according to this embodiment includes an optical array of a first spacer array 41, a first lens array 42, a second spacer array 43, a second lens array 44, and an aperture array 45, and has a five-layer structure. And it adhere | attaches by ultraviolet curing resin etc. alternately.

The first spacer array 41 is in contact with a solid-state image sensor such as a CCD (Charge Coupled Devices) type image sensor or a CMOS (Complementary Metal-Oxide Semiconductor) type image sensor (not shown), and the first lens array 42 and the solid-state image sensor. The distance between the device and the optical axis is kept constant. Further, the second spacer array 43 keeps the distance between the first lens array 42 and the second lens array 44 in the optical axis direction constant. The first spacer array 41 and the second spacer array 43 are made of black resin.

Then, in the same manner as described above, the cemented lens 40a as shown in FIG. 9 is cut out using the cutting line CT that is the both ends of the CO as a boundary portion.

The cemented lens 40a includes a first spacer portion 41a, a first lens portion 42a, a second spacer portion 43a, a second lens portion 44a, and a diaphragm portion 45a. And each has the abutting plane part CLa which positions in the direction of the optical axis AX. Although positioning in the vertical direction with respect to the optical axis AX is not shown, it is provided at the end of each optical array and is not in the vicinity of each lens surface. However, since the optical arrays are bonded to each other with an adhesive in the state of the cemented lens array 400, each lens portion or the like is not displaced in the vertical direction with respect to the optical axis AX even if the cemented lens 40a is cut out. Absent.

Further, in order to collect the adhesive BD that oozes out as a surplus when each optical array is joined, the adhesive reservoir BA is a step between the abutting flat surface portion CLa and the lens surfaces 42aL and 44aL of each optical array. It is formed in a shape. In FIG. 9, the adhesive reservoir portion BA is formed in the first spacer portion 41a, the first lens portion 42a, the second spacer portion 43a, and the aperture portion 45a. It may be formed anywhere as long as it is a portion on the axis AX side. That is, the adhesive reservoir portion BA may be formed on the first spacer portion 41a side of the first lens portion 42a without being formed on the first spacer portion 41a. Further, the adhesive reservoir BA may be formed on the first lens portion 42a side of the second spacer portion 43a without being formed on the first lens portion 42a. The adhesive reservoir BA may be formed on the second spacer portion 43a side of the second lens portion 44a without being formed on the second spacer portion 43a. Further, the adhesive reservoir BA may be formed on the diaphragm 45a side of the second lens unit 44a without being formed on the diaphragm 45a.
[Sixth Embodiment]
Hereinafter, the cemented lens array and the manufacturing method thereof according to the sixth embodiment will be described with reference to the drawings. 10 is a cross-sectional view of the cemented lens array 500, and FIG. 11 is a cross-sectional view of the cemented lens 50a.

The cemented lens array 500 in the present embodiment includes an optical array of a spacer array 51, a first lens array 52, a second lens array 53, and an aperture array 54, and has a four-layer structure. And it adhere | attaches by ultraviolet curing resin etc. alternately.

The spacer array 51 is in contact with a solid-state image sensor such as a CCD image sensor or a CMOS image sensor (not shown), and maintains a constant distance in the optical axis direction between the first lens array 52 and the solid-state image sensor. The spacer array 51 is made of a black resin.

The first lens array 52 and the second lens array 53 are lens blocks in which lens portions made of resin are respectively formed on the object side surface and the image side surface of a parallel plate made of glass, and are manufactured by a replica method or the like. .

Then, in the same manner as described above, the cemented lens 50a as shown in FIG. 11 is cut out using the cutting line CT which is both ends of the CO as a boundary portion.

The cemented lens 50a includes a spacer part 51a, a first lens part 52a, a second lens part 53a, and a diaphragm part 54a. In the first lens portion 52a, an eleventh lens portion 52a2 and a twelfth lens portion 52a3 are formed on both surfaces of the parallel plate 52a1, and a second lens portion 53a is formed on both surfaces of the parallel plate 53a1. 22 lens part 53a3 is formed.

Each part of the cemented lens 50a has an abutting flat surface part CLa for positioning in the direction of the optical axis AX. Although positioning in the vertical direction with respect to the optical axis AX is not shown, it is provided at the end of each optical array and is not in the vicinity of each lens surface. However, since the optical arrays are bonded to each other with an adhesive in the state of the cemented lens array 500, each lens unit or the like is not displaced in the vertical direction with respect to the optical axis AX even if the cemented lens 50a is cut out. Absent.

Further, in order to store the adhesive BD that oozes out as a surplus when each optical array is bonded, the adhesive reservoir BA is a step between the abutting flat surface portion CLa of each optical array and the lens surfaces 52aL and 53aL. It is formed in a shape. In FIG. 11, the adhesive reservoir BA is formed in the spacer 51a, the twelfth lens 52a3 of the first lens 52a, and the stop 54a, but the optical axis of the opposed abutting flat surface CLa. As long as it is a part on the AX side, it may be formed anywhere. That is, the adhesive reservoir portion BA may be formed on the spacer portion 51a side of the eleventh lens portion 52a2 without being formed on the spacer portion 51a. The adhesive reservoir BA may not be formed on the twelfth lens portion 52a3 but may be formed on the twelfth lens portion 52a3 side of the twenty-first lens portion 53a2. Furthermore, the adhesive reservoir BA may be formed on the diaphragm 54a side of the twenty-second lens section 53a3 without being formed on the diaphragm 54a.

As mentioned above, although this invention was demonstrated according to embodiment, this invention is not limited to the said embodiment.

First, in the above embodiment, the laminated structure is three layers or two layers. However, the present invention is not limited to this, and the present invention can be applied to a cemented lens array having more layers.

Further, although an ultraviolet curable resin is used as the adhesive, it is not limited to this as long as it has an appropriate viscosity, and may be a material having thermosetting properties, for example.

Further, various cutting methods other than those using an end mill tool are conceivable. For example, cutting with a laser, a dicer, a hole saw, or the like is conceivable. When a laser is used, the laser diameter is cut to CO.

Claims

A cemented lens array formed by laminating a plurality of optical arrays including a lens array,
Provided in each peripheral portion of a plurality of lens surfaces constituting the lens array, and in contact with another optical array adjacent to the lens array in the optical axis direction with an adhesive interposed therebetween, An abutting flat surface for positioning relative to the other optical array in the optical axis direction;
At least one of the lens array and the other optical array is formed in a region sandwiched between each abutting plane part and each lens surface, and the abutting plane part is positioned by positioning in the optical axis direction between the optical arrays. A cemented lens array comprising: an adhesive reservoir portion that accumulates an adhesive that oozes out as a surplus.
A pair of convex portions and concave portions outward from each abutting flat surface portion between each peripheral portion of the plurality of lens surfaces of the lens array and each contact portion of the other optical array that contacts the peripheral portions. Each of the lens array and the other optical array, and further includes a concave and convex fitting portion that performs relative positioning in the vertical direction of the optical axis by fitting. The cemented lens array according to claim 1.
3. The cemented lens array according to claim 2, wherein the concave-convex fitting portion is formed including the abutting flat surface portion and a side surface extending from an outer edge portion of the abutting flat surface portion.
The plurality of optical arrays include a first lens array corresponding to the lens array and a second lens array corresponding to the other optical array, and the abutting flat surface portion and the concave / convex fitting portion correspond to each other. 4. The relative positioning of the plurality of lens surfaces of the first lens array and the plurality of lens surfaces of the second lens array is performed. Cemented lens array.
The cemented lens array according to any one of claims 1 to 4, wherein the plurality of optical arrays include a diaphragm array having a plurality of diaphragms corresponding to the plurality of lens surfaces. .
The cemented lens array according to any one of claims 2 to 4, wherein the concave-convex fitting portion has a cylindrical shape.
The cemented lens array according to any one of claims 2 to 4, wherein the concave-convex fitting portion is formed in a tapered shape.
The cemented lens array according to any one of claims 2 to 7, wherein the concave-convex fitting portion has a predetermined play between a pair of convex portions and concave portions. .
The adhesive reservoir is formed by a stepped groove having a height of 0.03 mm to 0.05 mm and a width of 0.1 mm to 0.2 mm. The cemented lens array according to any one of Items 1 to 8.
The width of the adhesion part of the said abutting flat part is 1/6 or more and 1/4 or less with respect to the width | variety of one lens unit, The any one of Claim 1 thru | or 9 characterized by the above-mentioned. The cemented lens array according to Item.
It is formed by being cut out from the cemented lens array according to any one of claims 1 to 10.
A lens portion formed by a lens surface of the lens array and a peripheral portion of the lens surface; and an optical element bonded by an adhesive adjacent to the lens portion in the other optical array. A cemented lens.
A method of manufacturing a cemented lens array formed by laminating a plurality of optical arrays including a lens array,
An adhesive supply step of supplying an adhesive between a peripheral portion of the lens surface constituting the lens array and a contact portion of another optical array that contacts the peripheral portion;
Relative with respect to the optical axis direction of the lens array and the other optical array by an abutting flat portion provided in a peripheral portion of the lens surface of the lens array and abutting against a contact portion of the other optical array A positioning step having a first positioning step for performing proper positioning;
A bonding step of curing the adhesive applied between the lens array and the other optical array to bond the positioned lens array and the other optical array;
In the positioning step, the adhesive that oozes out as a surplus from the abutting plane part is a region sandwiched between the abutting plane part and the lens surface in at least one of the lens array and the other optical array. A method for manufacturing a cemented lens array, characterized in that the cemented lens array is stored in an adhesive reservoir portion formed on the substrate.
The positioning step includes a pair of convex portions and concave portions on the outer side from the abutting flat surface portion between each peripheral portion of the plurality of lens surfaces of the lens array and each contact portion of the other optical array. A concave / convex fitting portion that is formed and enables fitting between the lens array and the other optical array is used to relatively position the lens array and the other optical array in the direction perpendicular to the optical axis. The method for manufacturing a cemented lens array according to claim 12, further comprising two positioning steps.