JP4680125B2 - Lens frame and imaging device - Google Patents

Description

  The present invention relates to, for example, a lens frame that is used in a digital camera, a video camera, and the like and is driven at the time of optical zoom, and an imaging device using the lens frame.

  Conventionally, a lens frame used in an imaging apparatus such as a digital camera or a video camera is guided and supported so as to be movable in the optical axis direction, and optical zooming is performed by driving the lens frame.

  A lens is fixed to the lens frame by an adhesive. That is, the lens frame has an adhesive reservoir for injecting the adhesive.

And in order to raise the adhesive strength with respect to the said lens, the said adhesive sump part is enlarged and the said adhesive agent is thickened (refer patent 3365543 gazette: patent document 1).
Japanese Patent No. 3365843

  However, in recent years, digital cameras, particularly camera modules incorporated in portable devices and optical devices for mobile applications such as video cameras, are required to have high drop impact resistance.

  In the conventional lens frame, in order to increase the adhesive strength with respect to the lens, the adhesive reservoir portion is enlarged. Therefore, the rigidity of the lens frame is significantly reduced, and the adhesive in the adhesive reservoir portion is reduced. This causes a concentration of stress on the lens, causing problems such as breaking of the lens without being able to withstand the deformation of the lens frame and the adhesive.

  If the adhesive reservoir portion is made small, the rigidity of the lens frame is improved, but the adhesive strength to the lens is lowered. Even if the adhesive reservoir portion is simply reduced, the stress generated in the adhesive in the adhesive reservoir portion cannot be reduced to such an extent that the lens is not peeled off from the adhesive. The lens is detached from the lens frame.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lens frame and an imaging apparatus that improve rigidity and prevent lens breakage and lens detachment due to drop impact.

In order to solve the above problems, the lens frame of the present invention is:
A lens body in which a lens is fitted and two shaft holes into which each of the two guide shafts is inserted and supported so as to be slidable in the optical axis direction of the lens are provided. ,
At least three adhesive reservoir portions into which an adhesive for fixing the lens is injected are formed at equal intervals in the circumferential direction on the inner peripheral surface of the lens hole,
The shape connecting the center of gravity of the frame body and the centers of the two shaft holes is a triangle,
The one adhesive reservoir portion is disposed so as to be furthest from a reference straight line connecting the centers of the two shaft holes, and the at least three adhesive reservoir portions are arranged with respect to the reference straight line. It is characterized by being arranged asymmetrically.

  According to the lens frame of the present invention, the one adhesive reservoir is disposed farthest from the reference straight line, and the at least three adhesive reservoirs are asymmetric with respect to the reference straight line. Since it is arrange | positioned, the fall of the cross-sectional secondary pole moment by the said other adhesive agent pool part is suppressed. Therefore, the rigidity of the lens frame can be improved without increasing the thickness of the lens frame, and the drop impact resistance such as prevention of lens cracking is improved.

  Then, when the adhesive is injected into the adhesive reservoir and the lens is fixed to the lens frame with the adhesive, the adhesive of the adhesive reservoir is improved by improving the rigidity of the lens frame. Since the generated stress can be reduced, even if the adhesive strength to the lens is reduced due to the small size of the adhesive reservoir, the lens does not come off the lens frame due to a drop impact. That is, the stress generated in the adhesive can be reduced to such an extent that the lens does not peel from the adhesive.

  Further, in the lens frame of one embodiment, a projection plane obtained by projecting each of the at least three adhesive reservoir portions perpendicularly to a plane including the central axis of each of the two shaft holes and the reference straight line, They do not overlap each other.

  According to the lens frame of this embodiment, the projection plane obtained by projecting each of the at least three adhesive reservoir portions perpendicularly to the plane including the central axis of each of the two shaft holes and the reference straight line is: Since they do not overlap each other, the reduction in the moment of inertia of the cross section can be suppressed, the rigidity of the lens frame can be further improved, and the drop resistance is further improved.

  In one embodiment of the lens frame, the adhesive reservoir has a bottom surface facing the outer peripheral surface of the lens, and the bottom surface includes a central axis of the lens hole that coincides with the optical axis of the lens. In the cross section, it is inclined with respect to the central axis of the lens hole.

  According to the lens frame of this embodiment, the bottom surface of the adhesive reservoir portion is inclined with respect to the central axis of the lens hole in a cross section including the central axis of the lens hole. Compared with the case where the bottom surface of the reservoir is parallel to the central axis of the lens hole, the adhesive reservoir can be further reduced, the rigidity of the lens frame can be further improved, and the drop resistance is further improved. To do.

  The imaging device of the present invention includes the lens frame, a lens fitted in the lens hole of the lens frame, and the lens frame inserted in the shaft hole of the lens frame in the optical axis direction of the lens. And a guide shaft that is slidably supported.

  According to the imaging apparatus of the present invention, since the lens frame is provided, the rigidity of the lens frame can be improved and the drop resistance is improved.

  According to the lens frame of the present invention, the one adhesive reservoir is disposed farthest from the reference straight line, and the at least three adhesive reservoirs are asymmetric with respect to the reference straight line. Since it is arranged, the rigidity can be improved and the lens can be prevented from cracking or coming off due to a drop impact.

  Further, according to the imaging apparatus of the present invention, since the lens frame is provided, the rigidity can be improved and the lens can be prevented from cracking or coming off due to a drop impact.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

  FIG. 1 is a perspective view showing an embodiment of an imaging apparatus according to the present invention. FIG. 2 shows an exploded perspective view of the imaging apparatus of the present invention. The imaging device is built in a portable device such as a digital camera or a video camera.

  As shown in FIGS. 1 and 2, the imaging apparatus includes an optical block 90 that holds an optical system such as a lens, a drive block 100 that holds a drive component group that drives a lens frame such as a stepping motor, and a CCD substrate. 110. The optical block 90 and the drive block 100 are bonded to each other by screws 100d and an adhesive, and the CCD substrate 110 is bonded to the optical block 90 by an adhesive.

  FIG. 3 is an exploded perspective view of the optical block 90. As shown in FIG. 3, the optical block 90 includes an optical block first housing 90a to which the lens frames 10, 20 and the guide shafts 30, 40, 50 are attached, and an optical block second housing 90b.

  The optical block first housing 90a has a large opening to improve workability during assembly. After assembling the lens frames 10 and 20 and the guide shafts 30, 40, and 50 to the optical block first housing 90a, the optical block second housing 90b is joined to the optical block first housing 90a. Then, a part of the opening of the optical block first housing 90a is closed. The remaining opening of the first optical block housing 90a is closed by joining the drive block 100 (shown in FIG. 2).

  The optical block first housing 90a supports and fixes the first lens 91 on the side surface 901a closest to the object to be photographed, while the first side surface 902a (shown in FIG. 2) of the CCD substrate 110 closest to the CCD light receiving unit 110a The four lenses 92 are supported and fixed, and the optical axes of the first lens 91 and the fourth lens 92 coincide with each other.

  The first lens frame 10 is guided and supported by the first main guide shaft 30 so as to be slidable in the optical axis direction. The second lens frame 20 is guided and supported by the second main guide shaft 40 so as to be slidable in the optical axis direction. The first lens frame 10 and the second lens frame 20 are prevented from rotating around the optical axis by the sub guide shaft 50.

  3 and 4, the optical block first housing 90a includes shaft holes 30a and 30b for the first main guide shaft for supporting and fixing the first main guide shaft 30, and the above. There are shaft holes 40a and 40b for the second main guide shaft for supporting and fixing the second main guide shaft 40, and shaft holes 50a and 50b for the sub guide shaft for supporting and fixing the sub guide shaft 50.

  The central axes of the shaft holes 30a, 30b for the first main guide shaft, the shaft holes 40a, 40b for the second main guide shaft, and the shaft holes 50a, 50b for the sub guide shaft are the optical axes. Parallel to it.

  The shaft hole 30a, 40a, 50a is provided in the outer wall (side surface 901a) of the optical block first housing 90a on the object side, and the outer wall (side surface 902a) of the optical block first housing 90a on the CCD substrate side. ) Is provided with the shaft holes 30b, 40b, 50b. The guide shafts 30, 40, 50 are press-fitted into the shaft holes 30a, 30b, 40a, 40b, 50a, 50b and supported and fixed.

  Since the shaft holes 30a, 30b, 40a, 40b, 50a, 50b are molded as an integral part, it is possible to increase the relative positional accuracy by adjusting the mold. That is, since the first main guide shaft 30 and the second main guide shaft 40 can be adjusted to increase the parallelism, the lens frame 10, even if there are two main guide shafts 30, 40. The positional accuracy between 20 is high, and good optical characteristics are obtained.

  As shown in the partially cutaway perspective view of FIG. 5 and the partially sectional plan view of FIG. 6, the second lens 11 is attached to the first lens frame 10, and the second lens frame 20 has the second lens frame 20. The third lens 21 is attached, and the optical axes of the second lens 11 and the third lens 21 coincide with the optical axes of the first lens 91 and the fourth lens 92, respectively.

  In the optical block first housing 90a, transmissive photosensors 121 and 122 are attached as origin sensors to the origin positions when the first lens frame 10 and the second lens frame 20 are driven.

  The first lens frame 10 and the second lens frame 20 are provided with light-shielding plates 10b and 20b, respectively, and the light-shielding portion between the light-emitting parts and the light-receiving parts of the transmission type photosensors 121 and 122 is provided. The transmission type photosensors 121 and 122 detect the origins of the first lens frame 10 and the second lens frame 20 by shielding the plates 10b and 20b from light.

  The optical block first housing 90a has a pressure spring 60 that presses the first lens frame 10 and the second lens frame 20 against the thrust of the drive block 100 to suppress the occurrence of rattling during driving. Is attached. That is, the pressing spring 60 is disposed between the optical block first housing 90a and the first lens frame 10 and the second lens frame 20, and the first main guide shaft 30 and the second main guide. The shaft 40 is passed through.

  As shown in the exploded perspective view of FIG. 7 and the exploded side view of FIG. 8, the drive block 100 includes a drive block first housing 100a and a drive block second housing 100b. The drive block first housing 100a and the drive block second housing 100b include a first motor 150, a second motor 160, a first gear 170, a second gear 180, a first lead screw 130, and a second lead screw 140. The drive block first housing 100a and the drive block second housing 100b are fastened by screws 100c.

  The first gear 170, the second gear 180, the first lead screw 130, and the second lead screw 140 are supported so as to be rotatable around respective central axes.

  The first motor 150 is a stepping motor, and a gear portion 150 a attached to the output shaft of the first motor 150 meshes with the first gear 170, and the first gear 170 is connected to the first lead screw 130. Meshes with the input gear 130a.

  A first thrust plate 190 that is a plate having an internal thread is engaged with the output gear 130 b of the first lead screw 130, and the first thrust plate 190 is in contact with the first lens frame 10.

  Since the central axis of the female screw of the first thrust plate 190 is perpendicular to the contact surface of the first thrust plate 190, when the first lead screw 130 is rotated, the first thrust plate 190 is moved to the first thrust plate 190. It moves along the central axis of the lead screw 130.

  Since the first lead screw 130 is arranged in parallel with the optical axis of the lens system, the rotation of the first motor 150 becomes a thrust in the optical axis direction of the first lens frame 10.

  Meanwhile, the second motor 160 is a stepping motor, and a gear portion 160a attached to the output shaft of the second motor 160 meshes with the second gear 180, and the second gear 180 is connected to the second lead. It meshes with the input gear 140a of the screw 140.

  The output gear 140b of the second lead screw 140 is engaged with a second thrust plate 200, which is a plate having a female screw, and the second thrust plate 200 is in contact with the second lens frame 20.

  Since the center axis of the female screw of the second thrust plate 200 is perpendicular to the contact surface of the second thrust plate 200, the second thrust plate 200 is rotated when the second lead screw 140 rotates. It moves along the central axis of the lead screw 140.

  Since the second lead screw 140 is arranged parallel to the optical axis of the lens system, the rotation of the second motor 160 becomes a thrust in the optical axis direction of the second lens frame 20.

  As shown in FIG. 9, the first lens frame 10 has a frame body 10A in which a lens hole 10d and two shaft holes 10a and 10c are formed.

  The second lens 11 is fitted into the lens hole 10d. The first main guide shaft 30 is inserted into the shaft hole 10 a for the first main guide shaft, and is supported by the guide shaft 30 so as to be slidable in the optical axis direction of the second lens 11. The auxiliary guide shaft 50 is inserted into the auxiliary guide shaft shaft hole 10c, and is supported by the guide shaft 50 so as to be slidable in the optical axis direction of the second lens 11. The shaft hole 10a for the first main guide shaft is a hole in which the inner peripheral surface is continuous, while the shaft hole 10c for the sub guide shaft is a hole in which the inner peripheral surface is interrupted and is not continuous. It is.

  On the inner peripheral surface of the lens hole 10d, concave groove-like adhesive reservoir portions 14a, 14b, 14c into which the adhesives 13a, 13b, 13c for fixing the second lens 11 are injected are equidistant in the circumferential direction. Three are formed.

  That is, on the inner peripheral surface of the lens hole 10d, there are three lens receiving portions 12 holding the second lens 11 at equal intervals in the circumferential direction, and between the adjacent lens receiving portions 12 and 12, the above-described lens receiving portions 12 and 12 are provided. Adhesive reservoirs 14a, 14b, and 14c are formed.

  The shape connecting the center of gravity 15 of the frame body 10A and the centers of the two shaft holes 10a and 10c forms a triangle. The center of the shaft hole 10 a is located on the center axis of the first main guide shaft 30, while the center of the shaft hole 10 c is located on the center axis of the sub guide shaft 50.

  The one adhesive reservoir portion 14a is disposed so as to be furthest from a reference straight line 16 that connects the centers of the two shaft holes 10a and 10c, and the three adhesive reservoir portions 14a, 14b, 14 c is arranged asymmetrically with respect to the reference straight line 16.

  Each of the three adhesive reservoirs 14a, 14b, 14c is projected perpendicularly (as indicated by the arrows) to the plane including the central axis of each of the two shaft holes 10a, 10c and the reference straight line 16. The projected planes do not overlap each other.

  Next, as shown in FIGS. 3, 7, and 9, the force that acts on the first lens frame 10 when the imaging apparatus is dropped will be described. Six directions can be considered as the falling direction of the imaging apparatus.

  When a drop impact acts in a direction perpendicular to the optical axis direction, the drop impact is reduced by the deflection of the first main guide shaft 30 and the sub guide shaft 50.

  When dropping from the side surface 902 a on the CCD side, the drop impact is reduced by the pressing spring 60.

  When falling from the side surface 901a on the imaging object side, the drop impact acts on the first lens frame 10 from the drive block 100 via the first thrust plate 190. That is, the largest drop impact acting on the first lens frame 10 is parallel to the optical axis direction and is generated toward the side surface 902a on the imaging object side. This is because the vicinity of the shaft hole 10a for the main guide shaft is pressed against the side surface 902a on the CCD side against the pressing spring 60 by the first thrust plate 190.

  At this time, since the first thrust plate 190 is in contact with the vicinity of the shaft hole 10a, the first lens frame 10 bends along the guide shafts 30 and 50 with the shaft hole 10a as a fulcrum. .

  In order to increase the rigidity against such bending, a method of increasing the thickness of the first lens frame 10 is generally used in order to increase the moment of inertia of the cross section, which is an index indicating the difficulty of bending.

  However, in a mobile phone imaging device that is required to be smaller and have higher performance, the increase in the size of the first lens frame 10 causes interference with other components and an increase in driving voltage.

  Therefore, the present invention provides a solution that does not depend on an increase in the thickness of the first lens frame 10. Lines connecting the center of gravity 15 of the first lens frame 10, the center of the shaft hole 10a for the main guide shaft, and the center of the shaft hole 10c for the sub guide shaft each form a triangle. That is, since the center of gravity 15 of the first lens frame 10 is not on the reference straight line 16, when a drop impact acts in the optical axis direction, the first lens frame 10 has the vicinity of the reference straight line 16 as the center of rotation. It has been clarified in the present invention that twisting occurs.

As an index indicating the hardness against torsion, there is a cross-sectional secondary pole moment. As represented by the following [Equation 1], the cross-sectional secondary pole moment increases as the cross-sectional area at a position far from the center of rotation increases, and becomes difficult to twist. In [Expression 1], the distance from the rotation center of the minute area dA is r.

  Here, FIGS. 10A to 10D show a lens frame of the present invention and a lens frame as a comparative example. 10A shows a lens frame 10 of the present invention, FIG. 10B shows a lens frame 101 as a first comparative example, FIG. 10C shows a lens frame 102 as a second comparative example, and FIG. The lens frame 103 as a 3rd comparative example is shown. 10A to 10D are views as seen from the side 901a on the photographed object side, and the positions of the adhesive reservoirs are different from each other.

  As shown in FIG. 10A, the first adhesive reservoir portion 14 a is disposed at a position farthest from the reference straight line 16. In this configuration, the other second and third adhesive reservoir portions 14b and 14c are concentrated near the reference straight line 16 that is the center of rotation, and thus are arranged with the largest cross-sectional secondary pole moment. In the figure, a straight line 17 is a straight line that intersects the central axis (lens optical axis) of the lens hole 10 d while being orthogonal to the reference straight line 16, and indicates a position farthest from the reference straight line 16.

  As shown in FIG. 10B, in the lens frame 101, the adhesive reservoirs 14a, 14b, and 14c are counterclockwise compared to the lens frame 10 in FIG. It is arranged at a position rotated by 30 degrees.

  In the case of this arrangement, the first and third adhesive reservoir portions 14 a and 14 c are both at a position far from the reference straight line 16. Therefore, the first and third adhesive reservoir portions 14a and 14c reduce the secondary pole moment in cross section, and the rigidity of the lens frame 101 decreases.

Here, each of the first and third adhesive reservoir portions 14a and 14c is projected perpendicularly to a plane including the central axis of each of the two shaft holes 10a and 10c and the reference straight line 16. Projection planes overlap each other. Therefore, the cross-sectional second moment, which is an index representing the difficulty of bending, decreases at the portions where the respective projection planes overlap each other as represented by the following [Equation 2]. In [Expression 2], the distance from the neutral plane of the minute area dA is r.

  Therefore, when the adhesive reservoirs 14a, 14b, and 14c are arranged as shown in FIG. 10B, the rigidity of the lens frame 101 is lowered.

  As shown in FIG. 10C, in the lens frame 102, the adhesive reservoirs 14a, 14b, and 14c are arranged at a position rotated several degrees clockwise compared to the lens frame 10 of FIG. 10A. In the case of this arrangement, the first and second adhesive reservoir portions 14 a and 14 b are both at a position far from the reference straight line 16. Therefore, the first and second adhesive reservoir portions 14a and 14b reduce the secondary pole moment in cross section, and the rigidity of the lens frame 102 decreases.

  As shown in FIG. 10D, in the lens frame 103, the adhesive reservoirs 14a, 14b, and 14c are arranged at a position rotated several degrees clockwise compared to the lens frame 102 in FIG. 10C. In the case of this arrangement, the first, second and third adhesive reservoirs 14a, 14b and 14c are all located far from the reference straight line 16. Therefore, the first, second, and third adhesive reservoir portions 14a, 14b, and 14c reduce the secondary pole moment in cross section, and the rigidity of the lens frame 102 decreases.

  Next, Table 1 below shows the resonance frequencies of the lens frame 10 in FIG. 10A, the lens frame 101 in FIG. 10B, the lens frame 102 in FIG. 10C, and the lens frame 103 in FIG. 10D. As the rigidity increases, the resonance frequency also increases. Therefore, [Table 1] shows the result of calculating the resonance frequency as an index of rigidity.

[Table 1]

  As can be seen from [Table 1], the resonance frequency of the lens frame 10 in FIG. 10A is the highest, and the rigidity of the lens frame 10 in FIG. 10A is the highest.

  Next, as shown in the sectional view of FIG. 11, the first adhesive reservoir portion 14 a has a bottom surface 141 a that faces the outer peripheral surface of the second lens 11. The bottom surface 141a is inclined with respect to the central axis 101d of the lens hole 10d in a cross section including the central axis 101d of the lens hole 10d that coincides with the optical axis of the second lens 11. In other words, the bottom surface 141a is inclined so that the opening of the first adhesive reservoir portion 14a becomes larger from the side surface 902a on the imaging element side (shown in FIG. 3) toward the side surface 901a on the object side. ing. Although not shown, the bottom surfaces of the second and third adhesive reservoir portions 14b and 14c are also center axes of the lens hole 10d in the same manner as the bottom surface 141a of the first adhesive reservoir portion 14a. It is inclined with respect to 101d.

  According to the lens frame 10 configured as described above, the one adhesive reservoir portion 14a is disposed farthest from the reference straight line 16, and the three adhesive reservoir portions 14a, 14b, and 14c are Since they are arranged asymmetrically with respect to the reference straight line 16, it is possible to suppress a decrease in the cross-sectional secondary pole moment due to the other two adhesive reservoir portions 14 b and 14 c. Therefore, the rigidity of the lens frame 10 can be improved without increasing the thickness of the lens frame 10, and the drop impact resistance such as prevention of lens cracking can be improved.

  When the adhesives 13a, 13b, 13c are injected into the adhesive reservoirs 14a, 14b, 14c and the lens 11 is fixed to the lens frame 10 with the adhesives 13a, 13b, 13c, the lens By improving the rigidity of the frame 10, the stress generated in the adhesives 13a, 13b, 13c of the adhesive reservoirs 14a, 14b, 14c can be reduced, so that the adhesive reservoirs 14a, 14b, 14c can be made small. Even if the adhesive strength with respect to the lens 11 is reduced due to this, the lens 11 is not detached from the lens frame 10 due to a drop impact. That is, the stress generated in the adhesives 13a, 13b, and 13c can be reduced to such an extent that the lens 11 is not peeled off from the adhesives 13a, 13b, and 13c.

  Further, the projection planes obtained by projecting the three adhesive reservoir portions 14a, 14b, and 14c perpendicularly to the planes including the central axes of the two shaft holes 10a and 10c and the reference straight line 16, respectively, Since they do not overlap each other, the reduction in the moment of inertia of the cross section can be suppressed, the rigidity of the lens frame 10 can be further improved, and the drop resistance is further improved.

  In addition, the bottom surfaces of the adhesive reservoirs 14a, 14b, and 14c are inclined with respect to the central axis 101d of the lens hole 10d in a cross section including the central axis 101d of the lens hole 10d. Compared with the case where the bottom surfaces of the agent reservoirs 14a, 14b, and 14c are parallel to the central axis 101d of the lens hole 10d, the adhesive reservoirs 14a, 14b, and 14c can be further reduced, and the lens frame 10 Can further improve the rigidity and drop resistance.

  Moreover, according to the imaging device having the above-described configuration, since the lens frame 10 is provided, the rigidity of the lens frame 10 can be improved, and the anti-drop characteristic is improved.

  In addition, this invention is not limited to the above-mentioned embodiment. For example, four or more adhesive reservoirs may be formed, and one of the four or more adhesive reservoirs is disposed so as to be farthest from the reference straight line 16. In addition, the four or more adhesive reservoirs may be arranged asymmetrically with respect to the reference straight line 16.

  Further, the second lens frame 20 may have the same configuration as the first lens frame 10. Further, the lens hole 10d and the shaft holes 10a and 10c may be holes in which the inner peripheral surface is continuous, or may be holes in which the inner peripheral surface is interrupted and is not continuous. .

  Further, the projection planes obtained by projecting the three adhesive reservoir portions 14a, 14b, and 14c perpendicularly to the planes including the central axes of the two shaft holes 10a and 10c and the reference straight line 16, respectively, They may overlap each other.

  Further, the bottom surfaces of the adhesive reservoirs 14a, 14b, and 14c may be parallel to the central axis 101d of the lens hole 10d in a cross section including the central axis 101d of the lens hole 10d.

It is a perspective view which is one Embodiment of the imaging device of this invention. It is a disassembled perspective view of an imaging device. It is a disassembled perspective view of an optical block. It is sectional drawing of an optical block 1st housing | casing. It is a partially cutaway perspective view of an imaging device. It is a partial cross section top view of an optical block. It is a disassembled perspective view of a drive block. It is a disassembled side view of a drive block. It is a front view of a lens frame. It is a front view of the lens frame of this invention. It is a front view of the lens frame as a 1st comparative example. It is a front view of the lens frame as a 2nd comparative example. It is a front view of the lens frame as a 3rd comparative example. It is sectional drawing around the adhesive agent reservoir part of a lens frame.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 1st lens frame 10A Frame main body 10a, 10c Axis hole 10d Lens hole 101d Center axis 11 2nd lens 12 Lens receiving part 13a, 13b, 13c Adhesive 141a Bottom surface 14a, 14b, 14c Adhesive reservoir part 15 Center of gravity 16 Reference straight line 20 Second lens frame 21 Third lens 30, 40 Main guide shaft 50 Sub guide shaft 90 Optical block 91 First lens 92 Fourth lens 100 Drive block 110 CCD substrate 110a CCD light receiving unit

Claims (4)

A lens body in which a lens is fitted and two shaft holes into which each of the two guide shafts is inserted and supported so as to be slidable in the optical axis direction of the lens are provided. ,
At least three adhesive reservoir portions into which an adhesive for fixing the lens is injected are formed at equal intervals in the circumferential direction on the inner peripheral surface of the lens hole,
The shape connecting the center of gravity of the frame body and the centers of the two shaft holes is a triangle,
The one adhesive reservoir portion is disposed so as to be furthest from a reference straight line connecting the centers of the two shaft holes, and the at least three adhesive reservoir portions are arranged with respect to the reference straight line. A lens frame that is asymmetrically arranged. The lens frame according to claim 1,
Projection surfaces obtained by projecting each of the at least three adhesive reservoir portions perpendicularly to a plane including the central axis of each of the two shaft holes and the reference straight line do not overlap each other. Lens frame. The lens frame according to claim 1,
The adhesive reservoir has a bottom surface facing the outer peripheral surface of the lens,
The bottom surface of the lens frame is inclined with respect to the central axis of the lens hole in a cross section including the central axis of the lens hole that coincides with the optical axis of the lens. A lens frame according to claim 1;
A lens fitted in the lens hole of the lens frame;
An imaging apparatus comprising: a guide shaft that is inserted into the shaft hole of the lens frame and supports the lens frame so as to be slidable in the optical axis direction of the lens.

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