JP2009031694A - Lens holding device - Google Patents

Abstract

An object of the present invention is to provide a lens holding device that can be firmly fixed without causing dripping or dropping when a lens holder (lens barrel) is fixed to the lens holding device with an adhesive.
In a lens holding device that includes a holding member that is formed in a cylindrical shape and holds a lens holder inside thereof, and that fixes the lens holder outer periphery and the lens holding member inner periphery by bonding, the lens holder outer periphery and the lens holding member Spiral irregularities are provided on either or both of the adhesive surfaces on the inner periphery to prevent dripping of the adhesive, and the lens holder is firmly adhered to the lens holding device, and the spiral irregularities are adhered to each other. The lens holder can be separated from the lens holding device by peeling.
[Selection] Figure 1

Description

  The present invention relates to a lens holding device for fixing a lens barrel that accommodates a lens and whose optical axis is adjusted, for example, to a housing of a digital camera or the like having an image sensor, and in particular, the lens barrel is made of an adhesive. The present invention relates to a lens holding device that can be fixed without dripping or dropping.

  As shown in FIG. 6, the lens barrel 110 in which a plurality of lenses 111 are accommodated and whose optical axis is adjusted is fixed to the lens holding device 120 in the housing 122 such as a digital camera in which the image sensor 121 is arranged. Conventionally, the adhesive 100 is used.

  However, when the clearance between the lens barrel 110 and the inner diameter of the lens holding device 120 is large, or in an extreme case due to the eccentricity of the lens barrel 110 by adjusting the optical axis, the clearance around the lens barrel 110 is not uniform. Thus, as shown by the arrow 101, the adhesive 100 may dripping, and the adhesive may flow out to the glass 123 protecting the image sensor 121, the filter surface, etc. before being cured, and become dirty. It was.

  In addition, when an expansion or contraction occurs due to a temperature change, or when an impact is applied due to a drop or the like, the adhesive portion peels off, and the lens barrel 110 falls off the lens holding device 120, and the imaging function of the lens barrel 110 is lost. After that, it may be impossible to take a picture at all, or a great amount of time and cost may be required for repair. This is because the adhesive peels relatively easily from the adhesive surface, and is particularly likely to occur when the weight of the optical lens is large or the adhesive area is small.

  In order to prevent this, for example, Patent Document 1 discloses a bias in fixing a collimator lens holder or the like to a lens barrel that holds a semiconductor laser and is screwed to an optical box with an ultraviolet curable adhesive. As a result, the surface of the part of the lens barrel that fixes the lens holder is roughened, and the applied uncured UV-curing adhesive is uniformly dispersed. Yes.

Japanese Patent Laid-Open No. 8-136843

  However, in the technique disclosed in Patent Document 1, although the surface of the portion of the barrel that fixes the lens holder is roughened, there is a possibility that dripping may occur because the lens holder is not treated at all. In addition, when the lens holder expands or contracts due to changes in temperature, or when impact is applied due to dropping, etc., the lens holder falls off when the adhesion on the lens holder side is peeled off, causing damage as described above or degrading the optical axis. May occur.

  Therefore, in the present invention, when fixing the lens holder (lens barrel) to the lens holding device with an adhesive, it can be firmly fixed without causing dripping at the time of adhesion or dropping of the lens holder after adhesion, and the like. It is an object to provide a lens holding device that can be disassembled after bonding, and can be readjusted and reused.

In order to solve the above problems, the lens holding device of the present invention is
A lens holder containing the lens;
A holding member that is formed in a cylindrical shape and holds the lens holder inside thereof,
In the lens holding device that fixes the lens holder outer periphery and the holding member inner periphery by bonding,
A spiral unevenness is provided on either or both of the adhesion surfaces on the lens holder outer periphery and the holding member inner periphery.

Similarly,
A lens holder containing the lens;
A holding member that is formed in a cylindrical shape and holds the lens holder inside thereof,
In the lens holding device that fixes the lens holder outer periphery and the holding member inner periphery by bonding,
One of the adhesion surfaces of the lens holder outer periphery and the holding member inner periphery is provided with a spiral irregularity, and the other is provided with an annular irregularity, or an annular concave or convex shape.

  By configuring the lens holding device in this manner, the spiral shaped portion, the annular unevenness, or the annular concave or convex shape portion becomes an adhesive reservoir, and it is possible to prevent the adhesive from dripping into other portions. it can. In addition, after bonding, even if the adhesive part is peeled off due to expansion or contraction due to temperature change or dropping, etc., the helical part or annular concave part or annular concave part or convex part is screwed together. Therefore, since the holding member holds the lens holder firmly and does not easily separate the lens holder and the holding member, it prevents the lens holder from being broken and damaged or the optical axis is deviated. be able to. Nevertheless, if the force is applied to peel off the adhesion of the spiral portion, the lens holder and the holding member can be easily separated by rotating the lens holder along the spiral portion. The readjustment and reuse of the accommodated lens can be easily performed.

  The annular unevenness or the annular concave or convex shape is provided with a flat portion in a part in the circumferential direction, so that the adhesion of the annular unevenness or the annular concave or convex shape is peeled off. However, the annular unevenness or the annular concave or convex portion does not rotate, and the lens holder and the holding member can be separated by peeling off the adhesion of the helical portion as described above. .

  Further, a spiral-shaped adhesive surface on the outer periphery of the lens holder is provided only on the subject side in the optical axis direction of the lens, and a surface on the holding device side on the outer periphery of the lens holder is set to have a diameter smaller than the diameter of the spiral-shaped concave portion. By providing the spiral-shaped portion only in the portion to be processed, the processing of the mold of the lens holder can be reduced that much, and the surface on the holding device side on the outer periphery of the lens holder has a diameter smaller than the diameter of the spiral-shaped concave portion. Even when the holder and the holding member are separated from each other, it can be carried out without being caught except by the spiral shaped portion.

  Furthermore, since the lens holder is provided with a rotational force receiving portion that receives a rotational force about the optical axis, readjustment and reuse of the lens accommodated in the lens holder can be easily performed.

  In addition, since the adhesive used for the bonding has a high light shielding property, it has an effect of blocking the intrusion of light into the inside of the apparatus, and can be in a suitable form as a lens holding apparatus.

  As described above, according to the present invention, when the lens holder and the holding member are bonded, the dripping of the adhesive is effectively prevented. Since the concave / convex or annular concave / convex shape is screwed, the holding member holds the lens holder firmly and does not easily separate the lens holder from the holding member. It is possible to prevent accidents such as causing the optical axis to go wrong. In addition, if the adhesion of the spiral shaped portion is peeled off, the lens holder can be rotated along the spiral shaped portion, and the lens holder and the holding member can be separated, so that the lens accommodated in the lens holder can be separated. A lens holding device that can be easily readjusted or reused can be obtained.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions and relative arrangement of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely illustrative examples.

  FIG. 1 is a schematic sectional view of Embodiment 1 of the lens holding device according to the present invention. In the figure, reference numeral 10 denotes a lens barrel (lens holder) that accommodates the lens 11, and 12 denotes a spiral groove provided as a spiral irregularity on the outer periphery of the lens barrel 10 that adheres to the lens holding portion (holding member) 20. The spiral groove 12 is provided in a screw shape on the outer periphery of the lens barrel 10. Reference numeral 13 denotes a surface of the lens barrel 10 on the lens holding unit 20 side.

  Reference numeral 20 denotes a lens holding unit for holding the lens barrel 10. In this case, for example, the lens barrel 10 is fixed to a digital camera having an image sensor 21 in the housing 22, for example. Similarly to the spiral groove portion 12 provided on the outer peripheral portion of the lens barrel 10, the spiral groove portion provided in a screw shape on the inner periphery of the lens holding portion 20.

  Among these, the lens barrel 10 is moved during the optical axis adjustment in the lens holding portion 20, so that the difference between the outer diameter of the lens barrel 10 and the inner diameter of the lens holding portion 20 causes the lens barrel 10 to be adjusted by this optical axis adjustment. It is set to be longer than the moving distance. Therefore, if the optical axis of the lens barrel 10 can be adjusted, the spiral-shaped portions 12 and 23 may be in contact with each other at that time, and the pitch and direction (right-handed and left-handed) of the spiral-shaped portions 12 and 23 are There is no need to match.

  Thus, by providing the spiral groove portions 12 and 23 on the outer periphery of the lens barrel 10 and the inner periphery of the lens holding portion 20, for example, an ultraviolet curable adhesive 100 having a viscosity of 3,000 to 55,000 Pa · s. When the adhesive 100 is adhered, the adhesive 100 accumulates between the spiral grooves 12 and 23 due to its viscosity, and does not cause dripping. Further, after the adhesive 100 is cured, even if the adhesive 100 expands or contracts due to a temperature change, or an impact is applied due to dropping or the like and the adhesive part is peeled off, the adhesive 100 is solidified in the shape of the spiral grooves 12 and 23. Therefore, it is difficult to separate the lens barrel 12 and the lens holding portion 20 while holding the lens barrel 10 firmly, and the lens barrel 10 may be dropped and damaged, or the optical axis may be changed. Accidents such as going crazy can be prevented.

  In addition, even if the lens barrel 10 and the lens holding portion 20 are firmly fixed in this manner, when the adhesion of the spiral groove 23 is peeled off, the lens barrel 10 is rotated with the adhesive 100 attached. Thus, the lens barrel 10 can be rotated by the spiral groove portion of the spiral groove portion 23 and separated from the lens holding portion 20. Therefore, even when readjustment or reuse of the lens 11 accommodated in the lens barrel 10 is necessary, it can be easily performed.

  It is obvious that the shape, width, depth, number, and the like of the concave and convex portions in the spiral groove portions 12 and 23 are determined by conditions such as required adhesive strength and overall size, and are not limited to those illustrated. The same applies to the following examples.

  FIG. 2 is a perspective view (A) of the lens barrel 30 of the second embodiment in the lens holding device according to the present invention, and a schematic cross-sectional view of an example of an apparatus including a lens holding portion 40 for fixing the lens barrel 30. (B). The lens barrel 30 that accommodates the lens 31 shown in FIG. 2 is provided with a screw-like spiral groove 32 made of spiral irregularities that adheres to the inner periphery of the lens holding portion 40 on the entire outer periphery.

  Similarly to the above, the lens holding unit 40 is a structure that is provided in a digital camera having the image sensor 41 in the housing 42 and fixes the lens barrel 30 as an example, and 43 is an outer peripheral portion of the lens barrel 30. Similar to the spiral groove 32 provided in the lens holder 40, a spiral groove provided on the inner periphery of the lens holding portion 40 in a screw shape.

  Among these, the lens barrel 30 is moved during the optical axis adjustment in the lens holding portion 40 as described above. Therefore, the difference between the outer diameter of the lens barrel 30 and the inner diameter of the lens holding portion 40 is determined by this optical axis adjustment. It is set to be longer than the distance that the lens barrel 30 moves. Therefore, if the optical axis of the lens barrel 30 can be adjusted, the spiral-shaped portions 32 and 43 may be in contact with each other at that time, and the pitch and direction (right-handed and left-handed) of the spiral-shaped portions 32 and 43 are There is no need to match.

  The adhesive 100 used for bonding the lens barrel 30 and the lens holding portion 40 is an ultraviolet curable adhesive 100 having a viscosity of 3,000 to 55,000 Pa · s, as described above, so that the adhesive depends on the viscosity. 100 accumulates between the spiral grooves 32 and 43 and does not cause dripping. Further, after the adhesive 100 is cured, even if the adhesive 100 expands / shrinks due to a temperature change or an impact is applied due to dropping or the like and the adhesive part is peeled off, the adhesive 100 is solidified in the shape of the spiral grooves 32 and 43. Therefore, it is difficult to separate the lens barrel 30 and the lens holding portion 40, and it is possible to prevent an accident in which the lens barrel 30 falls away from the lens holding portion 40 and is damaged or the optical axis is distorted. it can.

  In addition, despite the fact that the lens barrel 30 and the lens holding portion 40 are firmly fixed in this way, unlike the case of the first embodiment shown in FIG. When the adhesive is peeled off, the lens barrel 30 is rotated by the spiral groove 32 or the spiral groove from which the adhesion of 43 is peeled off only by rotating the lens barrel 30, and is separated from the lens holding portion 40. Can do. Therefore, even when readjustment of the lens 31 accommodated in the lens barrel 30 is necessary, it can be easily performed.

  In the lens barrel 10 of the first embodiment shown in FIG. 1, the outer diameter of the convex portion of the spiral irregularities 12 provided on the outer peripheral portion to be bonded to the lens holding portion 20 of the lens barrel 10 is the same as that of the lens barrel 10. In the drawing, the outer diameter is the same as the surface 13 on the lower lens holding portion 20 side. Therefore, for example, when the adhesion on the spiral groove 12 side peels, the lens barrel 10 cannot move upward due to the surface 13 on the lens holding portion 20 side, and the lens barrel 10 and the lens holding portion cannot be moved upward. 20 cannot be separated. However, in the lens barrel 30 of the second embodiment shown in FIG. 2, the spiral groove portion 32 is also provided in the portion corresponding to 13 in the barrel 10 of FIG. The lens barrel 30 and the lens holding unit 40 can be separated.

  FIG. 3 is a perspective view (A) of the lens barrel 50 of the third embodiment of the lens holding device according to the present invention, and a schematic cross-sectional view of an example of an apparatus including a lens holding portion 40 for fixing the lens barrel 50. (B). The lens barrel 50 that accommodates the lens 51 shown in FIG. 3 is provided with a screw-like spiral groove 52 made of spiral irregularities that adheres to the inner periphery of the lens holding portion 40 on the subject side in the outer periphery. The outer diameter of the surface 53 on the lens holding portion 40 side is made smaller than the outer diameter of the recess in the screw-like spiral groove 52. The lens holding unit 40, the casing 42, and the spiral groove 43 of the third embodiment are the same as the lens holding unit 40 of the second embodiment shown in FIG.

  Among these, the lens barrel 50 is moved during the optical axis adjustment in the lens holding portion 40 as described above. Therefore, the difference between the outer diameter of the spiral groove 52 in the lens barrel 50 and the inner diameter of the lens holding portion 40 is the difference. The distance is set to be equal to or longer than the distance that the lens barrel 50 moves by adjusting the optical axis. Therefore, if the optical axis of the lens barrel 50 can be adjusted, the spiral-shaped portions 52 and 43 may be in contact with each other at that time, and the pitch and direction (right-handed and left-handed) of the spiral-shaped portions 52 and 43 are There is no need to match.

  The adhesive 100 used for bonding the lens barrel 50 and the lens holding portion 40 is the same as that used in the first embodiment and the second embodiment, and the adhesive 100 depends on the viscosity of the spiral grooves 52 and 43 depending on the viscosity. It does not accumulate in the middle and cause dripping. Similarly to the above, after the adhesive 100 is cured, it is possible to prevent an accident such that the lens barrel 10 falls away from the lens holding unit 20 and is damaged or the optical axis is deviated.

  Further, the lens barrel 50 is provided with a screw-like spiral groove 52 formed of spiral irregularities on the subject side in the outer peripheral portion, and the outer diameter of the surface 53 on the lens holding portion 40 side is the screw-like spiral groove 52. As in the case of the second embodiment shown in FIG. 2, the lens barrel 50 and the lens holding portion 40 can be separated only by rotating the lens barrel 50. Can do. Therefore, even when readjustment of the lens 31 accommodated in the lens barrel 30 is necessary, it can be easily performed.

  FIG. 4 is a perspective view (A) of a lens barrel 60 according to a fourth embodiment of the lens holding device according to the present invention, and a schematic cross-sectional view of an example of an apparatus including a lens holding portion 40 that fixes the lens barrel 60. (B). The lens barrel 60 that accommodates the lens 61 shown in FIG. 4 is provided with an annular concave or convex shape 62 at a portion to be bonded to the lens holding portion 40, and the annular concave or convex shape 62 is provided in the circumferential direction. A flat portion 64 is provided in part. In addition, the lens holding part 40, the housing | casing 42, and the helical groove part 43 of this Example 4 are the same as the lens holding part 40 of Example 2 shown in the said FIG.

  The adhesive 100 used for bonding the lens barrel 60 and the lens holding portion 40 is the same as that used in the first to third embodiments, and the adhesive 100 accumulates between the spiral grooves 62 and 43 due to the viscosity. No dripping. In addition, as described above, after the adhesive 100 is hardened, it is possible to prevent an accident such that the lens barrel 60 falls away from the lens holding unit 40 and is damaged or the optical axis is distorted.

  Since the lens barrel 60 moves during the optical axis adjustment in the lens holding portion 40 as described above, the difference between the outer diameter of the annular concave or convex shape 62 in the lens barrel 60 and the inner diameter of the lens holding portion 40 is large. The optical axis adjustment is set to be equal to or longer than the distance that the lens barrel 60 moves. Therefore, if the optical axis of the lens barrel 60 can be adjusted, the annular concave or convex shapes 62 and 43 may be in contact with each other at that time. The winding and the left-handing) need not be particularly limited.

  On the other hand, as described above, the lens barrel 60 of the fourth embodiment is provided with the flat portion 64. This is because if the flat portion 64 is not provided and only the annular concave or convex shape 62 is provided, and the adhesion of the adhesive portion 62 on the lens barrel 60 side peels, the concave or convex shape 62 becomes annular. Therefore, the lens barrel 60 rotates there. In such a case, even if the adhesion of the adhesion surface 43 on the lens holding portion 40 side is peeled off, the rotation in the spiral groove 43 is not performed, and the lens barrel 60 is attached to the lens as in the first to third embodiments. The holder 40 cannot be separated.

  The flat portion 64 is for preventing this, and even if the adhesion of the adhesive portion 62 on the lens barrel 60 side is peeled off due to the presence of the flat portion 64, the lens barrel 60 cannot rotate. When a rotational force about the optical axis is applied to the lens barrel 60, the adhesive portion on the spiral groove 43 side is peeled off, and the lens barrel 60 is separated from the lens holding portion 40 as in the first to third embodiments. Can do. Obviously, the position and shape of the flat portion are not limited to those shown in the drawing.

  FIG. 5 shows a rotational force around the optical axis of the lens barrel so that the lens barrel can be easily detached from the lens holding portion after the lens barrel and the lens holding portion described above are bonded. It is the perspective view which showed the rotational force receiving part for this.

  In the description of the first to fourth embodiments, in any of the embodiments, the lens barrel and the lens holding portion are separated by the presence of the spiral groove portion by peeling off the adhesion of the spiral groove portion between the lens barrel and the lens holding portion. I explained that I can do it. However, it is also true that the lens barrel and the lens holding portion are firmly bonded due to the presence of the spiral groove portion, and it is never easy to peel off the adhesion between the lens barrel and the lens holding portion.

  The structure for facilitating this is the mechanism shown in FIG. First, FIG. 5A shows a lens barrel 70 having a lens 71 provided with a notch 72 at a diagonal position passing through the optical axis on the subject side front surface. The lens barrel 70 can be rotated by inserting a forked driver-shaped jig.

  In FIG. 5B, holes 82 are provided at three positions on the subject-side front surface of the lens barrel 80 having the lens 81, and a three-pronged jig is inserted into the hole 82, and the mirror is inserted. The cylinder 80 can be rotated. In FIG. 5C, a parallel portion 92 that can be grasped with pliers or the like is provided at a rotationally symmetric position on the subject side surface of the lens barrel 90 having the lens 91. The lens barrel 90 can be rotated by gripping and rotating with a pliers.

  By doing so, the lens barrel receives the rotational force around the optical axis at the rotational force receiving portions 72, 82, and 92, and is provided on the outer periphery of the lens barrel or the lens holding portion by the force. By peeling off the adhesive in the spiral groove, the lens barrel can be rotated and separated by the spiral groove.

  In addition, the shape and dimension of the notch 72, the hole 82, and the parallel portion 92 in the figure are determined so as not to cause significant deformation or breakage of the grip portion according to the adhesive strength. For example, in FIG. 5A, two notches are taken as an example, but three or more may be used based on the center of the lens barrel. The same applies to FIGS. 5B and 5C. Further, in the example of FIG. 5C, the surface may be six surfaces, and a hexagon socket that is commercially available with a regular hexagonal shape may be usable.

  According to the present invention, it is possible to prevent dripping of the adhesive when the lens barrel, the lens barrel, and the lens holding portion are bonded, and after bonding, the lens barrel is held even if the bonding portion is peeled off. Since the lens barrel and the lens holding portion are not easily separated, it is possible to prevent an accident such as damage to the lens holder or the optical axis from being distorted, and to rotate the lens barrel by peeling off the bonding of the spiral groove. Thus, since the lens barrel and the lens holding part can be separated, a lens holding device that is convenient in various aspects can be obtained.

It is a schematic sectional drawing of Example 1 in the lens holding device which becomes this invention. It is a perspective view (A) of the lens barrel of Example 2 in the lens holding device according to the present invention, and a schematic cross-sectional view (B) of an example of a device provided with a lens holding portion for fixing the lens barrel. The perspective view (A) of a modification of the lens barrel of Example 3 in the lens holding device according to the present invention, and a schematic cross-sectional view (B) of an example of a device including a lens holding portion for fixing the lens barrel. is there. FIG. 6 is a perspective view (A) of a lens barrel of Example 4 in a lens holding device according to the present invention, and a schematic cross-sectional view (B) of an example of a device including a lens holding portion that fixes the lens barrel. It is a perspective view for demonstrating the mechanism provided in the lens-barrel side so that it can remove easily, when removing the lens-barrel after adhesion | attachment using the lens holding device which becomes this invention. The figure which showed the example of the adhesive dripping resulting from the eccentricity of the lens-barrel 110 produced in the conventional case which fixes the lens-barrel 110 which accommodated the several lens 111 to the lens holding device 120 using an adhesive agent. is there.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Lens barrel 11 Lens 12 Spiral-shaped groove part 13 Lens barrel front-end | tip part 20 Lens holding part 21 Imaging element 22 Case 23 Helical-shaped groove part 30 Lens barrel 31 Lens 32 Helical-shaped groove part 40 Lens holding part 41 Imaging element 42 Case 43 Helical groove portion 50 Lens barrel 51 Lens 52 Helical groove portion 53 Lens holding portion side surface 60 Lens barrel 61 Lens 62 Groove portion 63 Lens holding portion side surface 64 Anti-rotation portion

Claims (6)

A lens holder containing the lens;
A holding member that is formed in a cylindrical shape and holds the lens holder inside thereof,
In the lens holding device that fixes the lens holder outer periphery and the holding member inner periphery by bonding,
A lens holding device, wherein either one or both of the bonding surfaces on the outer periphery of the lens holder and the inner periphery of the holding member are provided with spiral irregularities. A lens holder containing the lens;
A holding member that is formed in a cylindrical shape and holds the lens holder inside thereof,
In the lens holding device that fixes the lens holder outer periphery and the holding member inner periphery by bonding,
A lens holding device, wherein either one of the bonding surfaces on the outer periphery of the lens holder and the inner periphery of the holding member is provided with spiral irregularities and the other is provided with annular irregularities, or annular concaves or convex shapes.   3. The lens holding device according to claim 2, wherein the annular unevenness or the annular concave or convex shape is provided with a flat portion at a part in a circumferential direction.   The helical adhesive surface on the outer periphery of the lens holder is provided only on the subject side in the optical axis direction of the lens, and the surface on the holding device side on the outer periphery of the lens holder has a diameter smaller than the diameter of the helical recess. Item 4. The lens holding device according to any one of Items 1 to 3.   The lens holding device according to any one of claims 1 to 4, wherein the lens holder is provided with a rotational force receiving portion that receives a rotational force about an optical axis.   The lens holding device according to any one of claims 1 to 5, wherein the adhesive used for the bonding has a high light shielding property.

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