JP2013057764A - Holding frame, optical element holding unit, lens barrel unit and imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a holding frame capable holding an optical element more firmly, an optical element holding unit, a lens barrel unit and an imaging apparatus.SOLUTION: A holding frame 81 holds an optical element 7 for deflecting the traveling direction of incident light in the direction orthogonal to the traveling direction and emitting the incident light, and has two openings 811, 812 for exposing an incident surface 72 and an emission surface 73 of light of the optical element 7, respectively, in a state of holding the optical element 7. This frame includes a notch 813a and a notch 813b which are provided at positions opposite to the side surfaces of the optical element 7 in a state of holding the optical element 7 in the vicinity of inner edges of the openings 811, 812, which approach to the central axes of the openings 811, 812 as they go far away from the openings 811, 812, and which have a surface whose at least a part is roughed.

Description

  The present invention relates to a holding frame that holds an optical element, an optical element holding unit, a lens barrel unit including the optical element holding unit, and an imaging apparatus.

  2. Description of the Related Art In recent years, imaging apparatuses such as digital cameras and digital video cameras are known in which a bending optical system that bends an optical path with an optical element such as a prism or a mirror is applied to an imaging optical system.

  By the way, when an optical element such as a lens or a prism is fixed to a holding frame, a lens barrel or the like, it is fixed by an adhesive. In this case, since the adhesive softens or expands at the ambient temperature, the position where the optical element is fixed is easily displaced. For this reason, the technique which can maintain an adhesive state when an optical element is fixed to a holding frame, a lens barrel, etc. with the adhesive agent is disclosed (refer patent document 1). In this technique, at least one of the adhesive surface of the optical element or the adhesive surface of the fixing member that holds the optical element is roughly formed, so that a good adhesion state can be maintained.

JP 2006-178388 A

  However, in the above-described technology, when the imaging device receives an impact due to dropping or the like, the optical element is detached from the holding frame or the optical axis of the optical element is shifted even though it is fixed by the adhesive. was there.

  The present invention has been made in view of the above, and provides a holding frame, an optical element holding unit, a lens barrel unit, and an imaging device that are excellent in impact resistance and can hold an optical element more firmly. For the purpose.

  In order to solve the above-described problems and achieve the object, a holding frame according to the present invention holds an optical element that emits light by deflecting a traveling direction of incident light in a direction orthogonal to the traveling direction, and A state in which the optical element is held in the vicinity of the inner edge of the opening in a holding frame formed with two openings exposing the light incident surface and the light exit surface of the optical element in a state where the element is held Provided at a position facing the side surface of the optical element, and is provided with a notch having a surface roughened at least partially while approaching the central axis of the opening as the distance from the opening increases. And

  The holding frame according to the present invention is characterized in that, in the above-described invention, the roughened surface of the notch has a zigzag shape in which an inclination angle with respect to a central axis of the opening changes in a predetermined pattern.

  The holding frame according to the present invention is characterized in that, in the above-mentioned invention, the roughened surface of the notch portion is composed of a plurality of curved surfaces.

  In the holding frame according to the present invention, in the above-described invention, a portion of the inner wall surface located around the notch portion that faces the side surface of the optical element in a state where the optical element is held is roughened. Features.

  In the holding frame according to the present invention, in the above invention, the inner wall surface facing the side surface of the optical element in the state where the optical element is held among the inner wall surfaces positioned around the notch is farther away from the opening. It has a shape that approaches the central axis of the opening.

  An optical element holding unit according to the present invention is filled between the above-described holding frame, the optical element held by the holding frame, the inclined surface of the notch portion, and the optical element. And an adhesive member that is fixed to the holding frame.

  The optical element holding unit according to the present invention is characterized in that, in the above invention, the optical element is a surface of a side surface held by the holding frame, and a surface filled with the adhesive member is roughened. And

  The optical element holding unit according to the present invention is characterized in that, in the above invention, the optical element is a prism or a lens.

  The lens barrel unit according to the present invention fixes the above-described optical element holding unit and the holding unit, and is provided in a subsequent stage of the optical element holding unit along the light traveling direction. And a fixed frame for holding an optical system having an optical axis parallel to the optical system.

  An imaging apparatus according to the present invention includes the lens barrel unit described above.

  According to the present invention, it is provided near the inner edge of the opening and at a position facing the side surface of the optical element while holding the optical element. The further away from the opening, the closer to the central axis of the opening and at least one of them. Since the portion includes a notched portion having a roughened surface, the surface area of the adhesive is increased and the adhesive strength is improved by the anchor effect. As a result, the optical element can be held more firmly, and the effect of excellent impact resistance is achieved.

FIG. 1 is a perspective view of an external appearance of the imaging apparatus according to the first embodiment of the present invention as viewed from the front side. FIG. 2 is a perspective view of the external appearance of the imaging apparatus according to the first embodiment of the present invention as viewed from the back side. FIG. 3 is a front view of the lens barrel unit according to the first embodiment of the present invention as viewed from the front side. 4 is a side view of the lens barrel unit in the direction of arrow A in FIG. FIG. 5 is a top view of the lens barrel unit in the direction of arrow B in FIG. 6 is a cross-sectional view taken along the line CC of FIG. FIG. 7 is a perspective view of the optical element holding unit before the optical element is held by the holding frame. FIG. 8 is a perspective view of the optical element holding unit after the optical element is held by the holding frame. FIG. 9 is a plan view of the holding frame in the direction of arrow D in FIG. FIG. 10 is a side view of the holding frame in the direction of arrow E in FIG. 11 is a cross-sectional view taken along line FF in FIG. 12 is a cross-sectional view taken along the line GG of FIG. FIG. 13 is an enlarged view in which the main part of the Z region in FIG. 12 is enlarged. FIG. 14 is a perspective view showing a situation when the optical element holding unit is fixed to the fixed frame. FIG. 15 is a cross-sectional view of the optical element holding unit according to the second embodiment of the present invention. FIG. 16 is a cross-sectional view of the optical element holding unit according to Embodiment 3 of the present invention. FIG. 17 is a cross-sectional view of an optical element holding unit according to a modification of the third embodiment of the present invention. FIG. 18 is a cross-sectional view of an optical element holding unit according to Embodiment 4 of the present invention. FIG. 19 is an enlarged view in which a part of the notch portion of FIG. 18 is enlarged. FIG. 20 is a cross-sectional view of an optical element holding unit according to Embodiment 5 of the present invention. FIG. 21 is a cross-sectional view of an optical element holding unit according to a modification of the fifth embodiment of the present invention. FIG. 22 is a cross-sectional view of a main part of an optical element holding unit according to Embodiment 6 of the present invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, modes for carrying out the present invention (hereinafter referred to as “embodiments”) will be described with reference to the drawings. In the following description, a digital camera is exemplified as an example of an image pickup apparatus including a lens barrel having an optical component bonding structure according to the present invention, but the present invention is not limited to this embodiment. In the description of the drawings, the same parts are denoted by the same reference numerals.

(Embodiment 1)
FIG. 1 is a perspective view of an external appearance of the imaging apparatus according to the first embodiment of the present invention as viewed from the front side. FIG. 2 is a perspective view of the external appearance of the imaging apparatus according to the first embodiment of the present invention as viewed from the back side. In the following description, as a unique coordinate system of the imaging apparatus 1, the width direction of the imaging apparatus 1 is the x axis, the direction parallel to the optical axis of the imaging apparatus 1 is the y axis, and the vertical direction of the imaging apparatus 1 is the z axis. And

  As shown in FIGS. 1 and 2, the imaging device 1 includes a housing 2 having a substantially rectangular parallelepiped box shape, and a camera control board (not shown) that is housed in the housing 2 and controls various types of the imaging device 1. And a lens barrel unit 3 having a bending optical system for imaging a subject.

  The housing 2 includes a front cover member 21 formed so as to cover the front surface, both side surfaces, the top surface, and the bottom surface, and a rear cover member 22 formed so as to cover the back surface side. The housing 2 is formed in a substantially rectangular parallelepiped box shape having a space inside by coupling the front cover member 21 and the rear cover member 22 in a state of facing each other.

  On the front surface of the front cover member 21, a shooting window 211 for allowing a subject light beam to enter the lens barrel unit 3 incorporated in the housing 2, and a light emission window by a strobe light emitting device (not shown). A part 212 and the like are provided. On the upper surface of the front cover member 21, a power switch 213 for switching the power of the imaging device 1 to an on state or an off state, a release switch 214 for instructing the imaging device 1 to perform a photographing operation, and the like are provided.

  The rear surface of the rear cover member 22 includes an operation switch group 221 for setting a shooting mode, an operation menu, and the like, a display panel made of liquid crystal or organic EL (Electro Luminescence), and the like, and displays an image corresponding to image data. A display monitor 222 and the like are provided.

  The camera control board is a CPU (Central Processing Unit) that performs overall control of the operation of the image pickup apparatus 1 by performing instructions and data transfer corresponding to each unit constituting the image pickup apparatus 1, and strobe light emission control that controls the strobe device. The image processing unit for performing image processing on the image data, a recording control unit for writing the image data to a recording medium such as a memory card, a camera shake detection sensor, and the like. The camera control board is incorporated in the front cover member 21.

  Here, the structure of the lens barrel unit 3 will be described. FIG. 3 is a front view of the lens barrel unit 3 viewed from the front side. FIG. 4 is a side view of the lens barrel unit 3 in the direction of arrow A in FIG. FIG. 5 is a top view of the lens barrel unit 3 in the direction of arrow B in FIG. 6 is a cross-sectional view taken along the line CC of FIG. 4 and 6, the left side is the front side, and the right side is the back side.

  As shown in FIGS. 3 to 6, the lens barrel unit 3 includes an optical system 4 that collects light from a predetermined visual field region, and receives light collected by the optical system 4 and performs photoelectric conversion to generate image data. And the lens barrel 6 that holds the optical system 4 and the imaging unit 5.

  The optical system 4 bends the subject luminous flux incident from the photographing window 211 provided on the front surface of the imaging device 1 by the reflecting surface 71 of the optical element 7 in a substantially right angle downward in the Z direction, and at the same time, the lens barrel unit 3 It is configured as a bending optical system (bending optical system) for forming a subject image on the imaging unit 5 having a light receiving surface facing upward on the bottom surface. In the first embodiment, a right-angle prism is described as an example of an optical element. However, the optical element may be configured by another optical element having a reflecting surface constituted by a flat surface or a curved surface, such as a variable mirror or a lens. In the following description, a subject light beam that passes through the photographing window 211 and enters the lens barrel unit 3 is referred to as a first optical axis O1, and the first optical axis O1 is reflected by the reflecting surface 71 of the optical element 7. The bent optical axis is defined as a second optical axis O2.

  The detailed structure of the optical system 4 will be described. The optical system 4 includes a first lens group 41 including the optical element 7, a second lens group 42 and a third lens group 43 which are disposed on the optical axis O2 and constitute a zoom lens, and the second lens group 42 and the second lens group 42. A shutter 44 that is disposed between the third lens group 43 and sets the state of the imaging unit 5 to an exposure state or a light shielding state, and a fourth lens group 45 that constitutes a focus lens. The first lens group 41 includes a front lens 411 disposed on the optical axis O1 and a rear lens 412 disposed below the optical element 7 and on the optical axis O2.

  The imaging unit 5 is configured using a CCD (Charge Coupled Device), a CMOS (Complementary Metal Oxide Semiconductor), or the like. The imaging unit 5 receives the light collected by the optical system 4 and performs photoelectric conversion to generate image data. It has an element 51, an image sensor frame 52 that holds the image sensor 51, an optical low-pass filter 53 provided in front of the image sensor 51, and a flexible printed board 54 on which the image sensor 51 is mounted.

  The lens barrel 6 includes an optical element holding unit 8 that holds the first lens group 41 including the optical element 7, a first lens group 42, a third lens group 43, a shutter 44, a fourth lens group 45, and the imaging unit 5. And a fixed frame 9 to be held.

  The optical element holding unit 8 is fixed to the fixed frame 9 by a plurality of screw members 11. Details of the structure of the optical element holding unit 8 will be described later.

  The fixed frame 9 includes a second frame 91 that holds the second lens group 42, a third frame 92 that holds the third lens group 43, and a fourth frame 93 that holds the fourth lens group 45. The second frame 91, the third frame 92, and the fourth frame 93 are held in the fixed frame 9 so as to be movable back and forth along the second optical axis O2. Thereby, the imaging apparatus 1 moves the fourth lens group 45 forward and backward along the optical axis O2 by driving a driving mechanism (not shown), for example, a stepping motor, during the focusing operation. As a result, the imaging device 1 can capture an image in which the subject is focused. In addition, the imaging device 1 drives a drive mechanism (not shown) during the zoom operation to move the second lens group 42 and the third lens group 43 forward and backward along the optical axis O2. The fixed frame 9 is formed with a positioning portion and a plurality of holes for positioning when the optical element holding unit 8 is fixed. The positioning part and the hole part will be described later.

  The lens barrel unit 3 having the above configuration is built in the housing 2 via a buffer member having elasticity or viscoelasticity such as rubber or urethane. Thereby, the imaging device 1 can protect the lens barrel unit 3 from an impact such as dropping.

  Next, the detailed structure of the above-described optical element holding unit 8 will be described. FIG. 7 is a perspective view of the optical element holding unit 8 before the optical element 7 is held by the holding frame 81. FIG. 8 is a perspective view of the optical element holding unit 8 after the optical element 7 is held by the holding frame 81. FIG. 9 is a plan view of the holding frame 81 in the direction of arrow D in FIG. FIG. 10 is a side view of the holding frame 81 in the direction of arrow E in FIG. 11 is a cross-sectional view taken along line FF in FIG. 12 is a cross-sectional view taken along the line GG of FIG.

  As shown in FIGS. 7 to 12, the optical element holding unit 8 is filled between the optical element 7, the holding frame 81 that holds the optical element 7, and the optical element 7 and the holding frame 81. And an adhesive member 10 that fixes the frame to the holding frame 81.

  The optical element 7 is configured using a right-angle prism. The optical element 7 has an incident surface 72 on which a subject light beam is incident and an output surface 73 that emits the subject light beam reflected by the reflecting surface 71 in the direction of the optical axis O2. The optical element 7 is a surface of a side surface (non-optical surface) held by the holding frame 81 and the surface filled with the adhesive member 10 is sandblasting, cutting processing by sanding, laser light irradiation processing, plasma processing or The surface is roughened by one or more chemical treatments (hereinafter referred to as “roughening treatment”).

  The holding frame 81 is formed in a box shape that can hold the optical element 7. The holding frame 81 is formed of a resin or a composite material such as ABS resin. The holding frame 81 has openings 811 and 812 that expose the entrance surface 72 and the exit surface 73 of the optical element 7 while holding the optical element 7. The holding frame 81 has a substantially rectangular shape when viewed from the optical axis O1 direction, and a bottom surface 813 that supports the reflecting surface 71 of the optical element 7 and a left and right inner part that holds the optical element 7 with the adhesive member 10 interposed therebetween. A wall surface 814, a first lens holding frame 815 that holds the front lens 411, a second lens holding frame 816 that holds the rear lens 412, and a plate-like fixing portion 817 that extends in the left and right directions from the outer edge of the holding frame 81. , 818. The adhesive member 10 may be an ultraviolet curable resin or the like.

  The bottom surface 813 has a substantially rectangular shape when viewed from the optical axis O1 direction. On the bottom surface 813, an adjustment hole 813a for adjusting the position of the optical element 7 when the optical element 7 is mounted is formed substantially at the center.

  The inner wall surface 814 is provided around each of the opening 811 and the opening 812, forms an inclined surface that approaches the optical element 7 as the distance from the opening 811 and the opening 812 increases, and at least a part of the surface of the inclined surface is rough. It has a cut-out portion 814a (C surface) and a cut-out portion 814b (C surface) (see FIGS. 7, 8, and 12). Specifically, the notch 814a and the notch 814b are subjected to chamfering processing in which an angle is cut off obliquely toward the optical element 7 in the middle of the end of the inner wall surface 814 (for example, a chamfering angle of 30 ° to 30 °). Within 45 degrees). Further, the roughened surface of the notch 814a forms a zigzag pattern having an irregular inclination angle with respect to the central axis of the opening 811. For example, as shown in FIG. 13, the roughened surface of the notch 814a is randomly formed within a range of an inclination angle of 1 to 45 degrees with respect to the central axis (for example, the optical axis O2) of the opening 812. ing. In addition, the inner wall surface 814 includes a first liquid reservoir 814c and a second liquid reservoir 814d that accommodate excess portions of the adhesive member 10 when the optical element 7 is fixed to the holding frame 81 by the adhesive member 10 (FIG. 11). And see FIG.

  As described above, it is provided near the inner edge of the openings 811 and 812 and at a position facing the side surface (non-optical surface) of the optical element 7 while holding the optical element 7. The notch part 814a and the notch part 814b having a surface roughened at least partially while approaching the central axis of the parts 811 and 812 are provided, and the adhesive member 10 is provided with the notch part 814a and the notch part 814b and the optical element 7. Filled in between, the optical element 7 and the holding frame 81 are fixed. Thereby, the surface area of the adhesive member 10 is expanded, and the adhesive strength is further improved by the anchor effect. As a result, even if the optical element holding unit 8 receives an impact due to the imaging device 1 being dropped or the like, the optical element 7 is less likely to be detached from the holding frame 81, and the optical element 7 is more likely to be displaced within the holding frame 81. It can be prevented and has excellent impact resistance.

  The first lens holding frame 815 has a substantially elliptical shape or a substantially circular shape when viewed from the optical axis O <b> 1 direction, and holds the front lens 411. The second lens holding frame 816 has a substantially elliptical shape when viewed from the direction of the optical axis O2, and holds the rear lens 412. The inner wall of the second lens holding frame 816 has a notch 816 a for injecting the adhesive member 10.

  The fixing portion 817 has circular through holes 817a and fitting holes 817b penetrating in parallel with the optical axis O2 at three locations. The fixing portion 818 has a circular through hole 818a and a fitting hole 818b penetrating in parallel with the optical axis O2 at two places. The through hole 817a and the through hole 818a are formed so as to surround the optical element 7 held by the holding frame 81 when viewed from the optical axis O2 direction.

  Here, a fixing method for fixing the optical element holding unit 8 to the fixing frame 9 will be described. FIG. 14 is a perspective view showing a situation when the optical element holding unit 8 is fixed to the fixed frame 9.

  As shown in FIG. 14, a flat surface portion 910 facing the fixing portion 817 is formed on the upper surface of the fixing frame 9 that fixes the optical element holding unit 8. A plurality of hole portions 911 a are formed in the plane portion 910 at positions that are coaxial with the through holes 817 a and the through holes 818 a of the fixing portion 817. The diameter of the hole portion 911a is smaller than the diameters of the through hole 817a and the through hole 818a. Further, positioning portions 911b are formed in the flat portion 910 at positions corresponding to the fitting holes 817b and the fitting holes 818b.

Thus, the positioning portion 911b is fitted in the fitting hole 817b and the fitting hole 818b,
The optical element holding unit 8 can be fixed to the fixed frame 9 by fixing the through hole 817 a and the through hole 818 a to the hole 911 a of the fixed frame 9 with the screw member 11.

  According to Embodiment 1 of the present invention described above, the optical element 7 is provided at a position near the inner edge of the openings 811 and 812 and facing the side surface (non-optical surface) of the optical element 7 while holding the optical element 7. As the distance from the openings 811 and 812 increases, the center axis of the openings 811 and 812 approaches and at least part of the surface is roughened, and a notch 814a and a notch 814b are provided, and the adhesive member 10 is provided with the notch 814a. The optical element 7 and the holding frame 81 are fixed by being filled between the notch 814 b and the optical element 7. Thereby, the surface area of the adhesive member 10 is expanded, and the adhesive strength is further improved by the anchor effect. As a result, even if the optical element holding unit 8 receives an impact due to the imaging device 1 being dropped or the like, the optical element 7 is less likely to be detached from the holding frame 81 and the optical element 7 is more likely to be displaced within the holding frame 81. It can be prevented and has excellent impact resistance.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. In the optical element holding unit according to Embodiment 2 of the present invention, only the surface of the notch is roughened. Therefore, only the optical element holding unit will be described below. In the description of the drawings, the same portions are denoted by the same reference numerals.

  FIG. 15 is a cross-sectional view of the optical element holding unit according to the second embodiment of the present invention. As shown in FIG. 15, the optical element holding unit 100 includes an optical element 7, a holding frame 101 that holds the optical element 7, and an adhesive member 10.

  The holding frame 101 has left and right inner wall surfaces 102 that hold the optical element 7 with the adhesive member 10 interposed therebetween. The inner wall surface 102 forms an inclined surface that approaches the optical element 7 as the distance from the opening 811 increases, and has a notch portion 102a in which at least a part of the surface of the inclined surface is roughened. Further, the inner wall surface 102 has a first liquid reservoir 814c.

  The notch 102 a is provided in the vicinity of the inner edge of the opening 811, at a position facing the side surface of the optical element 7 while holding the optical element 7, and approaches the central axis of the opening 811 as the distance from the opening 811 increases. In addition, at least a part of the surface is roughened. The notch 102 a is chamfered toward the optical element 7 and formed integrally with the inner wall surface 102. The roughened surface of the notch 102a has a zigzag shape in which the inclination angle with respect to the central axis of the opening 811 changes in a predetermined pattern. Specifically, the roughened surface of the notch 102 a forms a zigzag pattern having an irregular angle with respect to the central axis of the opening 811. For example, the roughened surface of the notch 102a is randomly formed within an angle of inclination of 1 to 45 degrees with respect to the central axis of the opening 811 (see FIG. 13).

  According to the second embodiment of the present invention described above, since only the surface of the notch 102a is roughened, it can be easily extracted from the mold when molding the holding frame 101 without increasing the cost. it can.

  Furthermore, according to Embodiment 2 of the present invention, only the surface of the notch 102a is roughened, so that the surface area of the adhesive member 10 can be increased and the adhesive strength can be improved by the anchor effect. Thereby, even if the optical element holding unit 100 receives an impact due to the imaging device 1 being dropped or the like, the optical element 7 is less likely to be detached from the holding frame 101, and the optical element 7 is more likely to be displaced within the holding frame 101. Can be prevented.

(Embodiment 3)
Next, a third embodiment of the present invention will be described. The optical element holding unit according to Embodiment 3 of the present invention differs in the shape of the inner wall surface of the holding frame. Therefore, only the optical element holding unit will be described below. In the description of the drawings, the same portions are denoted by the same reference numerals.

  FIG. 16 is a cross-sectional view of the optical element holding unit according to Embodiment 3 of the present invention. As shown in FIG. 16, the optical element holding unit 200 includes the optical element 7, a holding frame 201 that holds the optical element 7, and the adhesive member 10.

  The holding frame 201 has left and right inner wall surfaces 202 that hold the optical element 7 with the adhesive member 10 interposed therebetween. The inner wall surface 202 has a shape that approaches the central axis of the opening 811 as the distance from the opening 811 increases. Specifically, the inner wall surface 202 has a substantially tapered cross section. The inner wall surface 202 has a notch 202 a for injecting the adhesive member 10 when the optical element 7 is accommodated in the holding frame 201. Furthermore, the inner wall surface 202 has a first liquid reservoir 814a.

  The notch 202a is provided in the vicinity of the inner edge of the opening 811 and at a position facing the side surface of the optical element 7 while holding the optical element 7, and approaches the central axis of the opening 811 as the distance from the opening 811 increases. In addition, at least a part of the surface is roughened by a roughening treatment. The notch 202 a is chamfered toward the optical element 7 and is formed integrally with the inner wall surface 202. The roughened surface of the notch 202a has a zigzag shape in which the inclination angle with respect to the central axis of the opening 811 changes in a predetermined pattern. Specifically, the roughened surface of the notch 202 a forms a zigzag pattern having an irregular angle with respect to the central axis of the opening 811.

  According to the third embodiment of the present invention described above, the inner wall surface 202 has a shape that approaches the central axis of the opening 811 as the distance from the opening 811 increases, and the entire surface of the inner wall 202 including the notch 202a is rough. It has become. As a result, the holding frame 201 can be easily extracted from the mold during molding, and the optical element 7 can be detached from the holding frame 201 even if the imaging device 1 receives an impact on the optical element holding unit 200 due to dropping or the like. Can be prevented more.

(Modification of Embodiment 3)
In the third embodiment described above, the cross section of the optical element 7 is rectangular, but the shape of the optical element can be changed, for example.

  FIG. 17 is a cross-sectional view of an optical element holding unit according to a modification of the third embodiment of the present invention. As shown in FIG. 17, the optical element 210 is formed to be inclined so that the cross section spreads from the bottom surface to the top surface. Specifically, the optical element 210 has a tapered cross section. Further, the non-optical surface of the optical element 210 is roughened.

  According to the modification of the third embodiment of the present invention described above, the optical element 210 is formed to be inclined so as to spread from the bottom surface toward the top surface, so that the amount of use of the adhesive member 10 can be reduced. In addition, even when the imaging device 1 receives an impact on the optical element holding unit 200 due to dropping or the like, the optical element 210 can be further prevented from being detached from the holding frame 201.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described. The optical element holding unit according to Embodiment 4 of the present invention differs in the roughening formed on the inner wall surface of the holding frame. Therefore, only the optical element holding unit will be described below. In the description of the drawings, the same portions are denoted by the same reference numerals.

  FIG. 18 is a cross-sectional view of an optical element holding unit according to Embodiment 4 of the present invention. As shown in FIG. 18, the optical element holding unit 300 includes the optical element 7, a holding frame 301 formed of a resin or the like, and the adhesive member 10.

  The holding frame 301 has left and right inner wall surfaces 302 that hold the optical element 7 with the adhesive member 10 interposed therebetween. The inner wall surface 30 has a notch 302a and a first liquid reservoir 814c for injecting the adhesive member 10 when the optical element 7 is accommodated and fixed in the holding frame 301. The surface of the inner wall surface 302 including the notch 302a is composed of a plurality of curved surfaces. Specifically, as shown in FIG. 19, the curved lines are formed so that the tangents of the curved surfaces coincide with each other when viewed from the cross section.

  According to the fourth embodiment of the present invention described above, the surface of the inner wall surface 302 including the notch portion 302a is composed of a plurality of curved surfaces, so that the surface area of the adhesive member 10 is increased and the adhesive strength is improved by the anchor effect. . As a result, even if the optical element holding unit 300 receives an impact due to the imaging apparatus 1 being dropped or the like, the optical element 7 is not further detached from the holding frame 301, and the optical element 7 is further prevented from being displaced within the holding frame 301. can do.

(Embodiment 5)
Next, a fifth embodiment of the present invention will be described. The optical element holding unit according to the fifth embodiment of the present invention is different in the shape of the holding frame. Therefore, only the optical element holding unit will be described below. In the description of the drawings, the same portions are denoted by the same reference numerals.

  FIG. 20 is a cross-sectional view of an optical element holding unit according to Embodiment 5 of the present invention. As shown in FIG. 20, the optical element holding unit 400 includes the optical element 7, a holding frame 401 formed of resin or the like, and the adhesive member 10.

  The holding frame 401 has left and right inner wall surfaces 402 that hold the optical element 7 with the adhesive member 10 interposed therebetween. The inner wall surface 402 is formed with a tapered cross section. The inner wall surface 402 has a first liquid reservoir 814c. The entire surface of the inner wall surface 402 is roughened by a roughening process.

  According to the fifth embodiment of the present invention described above, the cross section of the inner wall surface 402 of the holding frame 401 is formed in a tapered shape, and the entire surface of the inner wall surface 402 is roughened. While being able to manufacture simply, the surface area of the adhesive member 10 is further expanded and the adhesive strength is improved by the anchor effect.

(Modification of Embodiment 5)
In the fifth embodiment described above, the roughened surface of the inner wall surface 402 has a zigzag shape in which the inclination angle with respect to the central axis of the opening 811 changes in an irregular pattern. Zigzag formation in which the inclination angle with respect to the central axis changes regularly may be performed.

  FIG. 21 is a cross-sectional view of an optical element holding unit according to a modification of the fifth embodiment of the present invention. As shown in FIG. 21, the inner wall surface 403 forms a zigzag pattern in which the inclination angle with respect to the central axis of the opening 811 regularly changes so as to be stepped.

  According to the modification of the fifth embodiment of the present invention described above, the angle of inclination of the opening 811 with respect to the central axis is regular so that the roughened surface of the inner wall surface 403 of the holding frame 401 is stepped. Zigzag formation that changes to Accordingly, the holding frame 401 can be easily extracted from the mold at the time of molding, and the optical element 7 is further detached from the holding frame 401 even if the optical element holding unit 400 receives an impact due to the imaging device 1 being dropped or the like. Can be difficult.

  Further, the modification of the fifth embodiment of the present invention can also be applied to the roughened surface of the notch described above.

(Embodiment 6)
Next, a sixth embodiment of the present invention will be described. The optical element holding unit according to the sixth embodiment of the present invention differs in the position of the surface to be roughened. Therefore, only the optical element holding unit will be described below. In the description of the drawings, the same portions are denoted by the same reference numerals.

  FIG. 22 is a cross-sectional view of a main part of an optical element holding unit according to Embodiment 6 of the present invention. As shown in FIG. 22, the optical element holding unit 500 includes a front lens 501, a first lens holding frame 502 that holds the front lens 501, and the adhesive member 10.

  The front lens 501 is roughened on the surface of the side surface (non-optical surface) held by the first lens holding frame 502 and filled with the adhesive member 10. The first lens holding frame 502 has an inner wall surface 503 that holds the front lens 501. The inner wall surface 503 is provided in the vicinity of the inner edge of the opening 811 and at a position facing the side surface of the front lens 501 while holding the front lens 501, and approaches the central axis of the opening 811 as the distance from the opening 811 increases. A notch 502a having a surface roughened at least partially is formed.

  The notch 502a forms an inclined surface that approaches the lens 501 as the distance from the opening 811 increases, and at least a part of the surface of the inclined surface is roughened. The notch 502 a is chamfered and formed integrally with the first lens holding frame 502. At least a part of the surface of the inner wall surface 503 including the notch 502a is roughened by a roughening process. The surface of the inner wall surface 203 including the notch 502a has a zigzag shape in which the inclination angle with respect to the central axis of the opening 811 changes in an irregular pattern. In addition, the surface of the inner wall surface including the notch 502a may be processed so that a zigzag shape and a curved surface are alternated.

  According to the sixth embodiment of the present invention described above, since the entire surface of the inner wall surface 503 including the notch 502a is roughened, the surface area of the adhesive member 10 is increased and the adhesive strength is increased by the anchor effect. Can be improved. As a result, even if the optical element holding unit 500 receives an impact due to the imaging device 1 being dropped or the like, the front lens 501 is less likely to be detached from the first lens holding frame 502, and the front lens 501 is not attached to the first lens holding frame 502. It is possible to further prevent the shift within.

  In the above-described embodiment, a compact digital camera has been described as an imaging device. However, the present invention is not limited to a digital video camera and an electronic device such as a mobile phone or a tablet portable device having a photographing function, binoculars, and the like. It can also be applied to a microscope or the like.

DESCRIPTION OF SYMBOLS 1 Imaging device 2 Housing | casing 3 Lens barrel unit 4 Optical system 5 Imaging unit 6 Lens barrel 7,210 Optical element 8,100,200,300,400,500 Optical element holding unit 9 Fixing frame 10 Adhesive 11 Screw member 21 Front cover member 22 Rear cover member 41 First lens group 42 Second lens group 43 Third lens group 44 Shutter 45 Fourth lens group 51 Imaging element 52 Imaging element frame 53 Optical low-pass filter 54 Flexible printed circuit board 71 Reflecting surface 72 Incident surface 73 Exit surface 81, 101, 201, 301, 401 Holding frame 102, 202, 302, 402, 403, 503, 814 Inner wall surface 102a, 202a, 302a, 502a, 814a, 814b Notch 211 Shooting window 212 For light emission Window 213 Power switch 214 Release Switch 221 Operation switch group 222 Display monitor 411, 501 Front lens 412 Rear lens 502 First lens holding frame 811, 812 Opening 813 Bottom surface 813 a Adjustment hole 814 c First liquid reservoir 814 d Second liquid reservoir 815 First lens holding frame 816 Second lens holding frame 817,818 fixing portion

Claims (10)

An optical element that emits light by deflecting the traveling direction of incident light in a direction orthogonal to the traveling direction is held, and the light incident surface and the light emitting surface of the optical element are exposed while the optical element is held. In the holding frame in which two openings are formed,
Near the inner edge of the opening and at a position facing the side surface of the optical element while holding the optical element, the distance from the opening approaches the central axis of the opening, and at least a part thereof A holding frame comprising a notch having a roughened surface. The roughened surface of the notch is
The holding frame according to claim 1, wherein the holding frame has a zigzag shape in which an inclination angle with respect to a central axis of the opening changes in a predetermined pattern.   The holding frame according to claim 1, wherein the roughened surface of the notch includes a plurality of curved surfaces.   The part facing the side surface of the optical element in a state in which the optical element is held in the inner wall surface located around the notch is roughened. The holding frame described in one.   Of the inner wall surfaces positioned around the notch, the inner wall surface facing the side surface of the optical element while holding the optical element has a shape that approaches the central axis of the opening as the distance from the opening increases. The holding frame according to any one of claims 1 to 4. A holding frame according to any one of claims 1 to 5,
The optical element held by the holding frame;
An adhesive member that is filled between the inclined surface of the notch and the optical element and fixes the optical element to the holding frame;
An optical element holding unit comprising:   The optical element holding unit according to claim 6, wherein the optical element is a surface of a side surface held by the holding frame and a surface to be filled with the adhesive member is roughened.   The optical element holding unit according to claim 6, wherein the optical element is a prism or a lens. The optical element holding unit according to any one of claims 6 to 8,
A fixing frame that fixes the holding unit and holds an optical system that is provided in a subsequent stage of the optical element holding unit along the light traveling direction and has an optical axis parallel to the light traveling direction;
A lens barrel unit comprising:   An imaging apparatus comprising the lens barrel unit according to claim 9.

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