JP2009217047A - Digital camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital camera having a reflection member for deflecting an optical path which enables an easy and accurate adjustment to the angle of the reflection member and has such a high impact resistance as prevents an input impact from changing the position and inclination of the reflection member. <P>SOLUTION: The digital camera comprises in a housing an imaging optical unit which has the reflection member having a reflection surface, a holding frame of resin holding the reflection member, a lens group and a stationary frame of resin holding the lens group and in which the holding frame is fixed to the stationary frame by a plurality of screw members. The screw members each have two tapping screw portions arranged coaxially in series, and the holding frame and the stationary frame are fixed together by the screw members in at least three positions about the reflection member. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a digital camera including an imaging optical system unit having a reflecting surface that bends a first optical axis to a second optical axis orthogonal to the first optical axis.

  As one form of a digital camera that captures a still image or a moving image of a subject using an image sensor such as a CCD, a so-called folding optical system in which an optical path is bent by a prism or a mirror is applied to an imaging optical system.

  In a digital camera equipped with a bending optical system, subject light is bent at a right angle by a reflecting member such as a prism or a mirror, and then connected to a light receiving surface of an image sensor by a lens group arranged in the width direction or the vertical direction of the housing. Therefore, the depth of the digital camera can be reduced.

  In a digital camera equipped with a bending optical system, for example, as shown in FIG. 8, a reflecting member 501 that bends the first optical axis O1 that is the optical axis of the subject light beam at right angles to the second optical axis O2, and a second An imaging optical system unit 500 having a plurality of lens groups 502 disposed on the optical axis O2 and an image sensor 503 disposed on the imaging surface of the lens group 502 is disposed inside the housing. ing.

  The reflecting member 501 is held by a frame-shaped holding frame 510, and a fixed frame that constitutes the skeleton of the imaging optical system unit 500 by a plurality of screws 530 inserted through through holes formed in the holding frame 510. It is fixed to 520.

  In this case, the holding frame 510 and the fixed frame 520 are fixed in the direction orthogonal to the second optical axis O2 by the frictional force generated by the thrust of the screw 530, so that the displacement occurs when an impact force is input. Is likely to occur. If the position and angle of the reflecting member 501 are shifted with respect to the plurality of lens groups 502 and the image sensor 503, distortion may occur in the obtained image or the resolution may be reduced.

  Therefore, in order to prevent the positional displacement between the members due to the input of such an impact, for example, as shown in Japanese Utility Model Registration No. 2558528, the tapered surface of the countersunk screw screwed into one member is set to the other. There is known a method for strengthening positioning between members by applying to members.

  Incidentally, the imaging optical system unit 500 shown in FIG. 8 is configured such that the angle of the holding frame 510 with respect to the fixed frame 520 can be adjusted at the time of assembly in order to optimize the distortion and resolution of the obtained image.

  In order to adjust the angle between the two members, a method is known in which a spacer such as a shim or washer having a predetermined thickness is appropriately inserted at a predetermined position between the two members.

  Further, as disclosed in Japanese Patent Application Laid-Open No. 2001-59928, a push spring or a pull spring is disposed between members, and an angle between two members is changed by changing a distance between the members by a push screw or a pull screw. There is also a known method of adjusting.

In addition, when the distance between the members is changed by such a push screw or a pull screw, in order to enable finer adjustment, two different pitches are provided as disclosed in Japanese Patent No. 2551219. A method of using a differential screw having a threaded portion is known.
Utility Model Registration No. 2558528 JP 2001-59928 A Japanese Patent No. 2551219

  For example, in the imaging optical system unit 500 shown in FIG. 8, when adjusting the angle between the holding frame 510 and the fixed frame 520 by appropriately inserting a spacer between the holding frame 510 and the fixed frame 520, the screw 530 is used. The problem is that the position where the spacer is inserted and the thickness of the spacer are changed and the screw 530 is tightened and the result is confirmed by a high degree of difficulty and complicated work. There is.

  In this case, the holding frame 510 and the fixed frame 520 are fixed in the direction perpendicular to the second optical axis O2 by the frictional force generated by the thrust of the screw 530. Therefore, when an impact force is input. Misalignment is likely to occur.

  For example, a method can be considered in which a tapered counterbore hole is provided in the holding frame and the screw 530 is a countersunk screw so that the tapers are brought into contact with each other so as to strengthen the positioning. However, with this method, when the shafts of the counterbore hole and countersunk screw are displaced due to tolerance, the taper contacts only partly, so-called one-side contact occurs, and this amount of shaft displacement is also caused by the input of impact force. There is a problem that the holding frame 510 is displaced.

  Further, when a push spring is provided between the holding frame 510 and the fixed frame 520 and the angle between the holding frame 510 and the fixed frame 520 is adjusted by the tightening amount of the screw 530, the man-hours necessary for adjusting the angle However, since the force for pressing the holding frame 510 against the fixed frame 520 is weakened and there is a backlash due to tolerance in the screw 530, the holding frame 510 is likely to be displaced when an impact force is input. There is a problem. This is the same even when a differential screw is used instead of the screw 530.

  The present invention has been made in view of the above problems, and is a digital camera having a reflecting member that bends a first optical axis to a second optical axis orthogonal to the first optical axis. The present invention provides a digital camera having a high impact resistance that can easily and accurately adjust the angle of a reflecting member and that does not cause a deviation in the position and inclination of the reflecting member due to an impact input after the adjustment. For the purpose.

  The digital camera according to the present invention includes a reflecting member having a reflecting surface that bends the first optical axis to a second optical axis perpendicular to the first optical axis, and a resin-made holding frame that holds the reflecting member. And a lens group disposed along the second optical axis, and a resin-made fixing frame that holds the lens group, and the holding frame is fixed to the fixing frame by a plurality of screw members. In the digital camera having an imaging optical system unit formed in a housing, the screw member includes a first tapping screw portion formed on one end side, and the other being coaxial with the first tapping screw portion. A second end formed on the end side, having the same twist direction as the first tapping screw portion, having an outer diameter larger than that of the first tapping screw portion and having a pitch different from that of the first tapping screw portion; A tapping screw portion of the holding frame and the front The fixed frame means that the first tapping screw portion is screwed into a pilot hole formed in the fixed frame at at least three places around the reflecting member when viewed from the direction along the second optical axis. In addition, the second tapping screw portions are fixed to each other in a state of being screwed into a through hole formed in the holding frame.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In each drawing used for the following description, the scale is different for each component in order to make each component large enough to be recognized on the drawing. It is not limited only to the quantity of the component described in the drawing, the shape of the component, the ratio of the size of the component, and the relative positional relationship of each component.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the present invention is applied to an imaging apparatus generally called an electronic camera, a digital camera, or the like.

  FIG. 1 is a perspective view showing the front side of the digital camera. FIG. 2 is a diagram illustrating the configuration of the imaging optical system unit. FIG. 3 is a diagram illustrating a fastening structure for fixing the holding frame to the fixed frame. FIG. 4 is a cross-sectional view showing the relationship among the holding frame, the fixed frame, and the screw member. FIG. 5 is a diagram illustrating a procedure of fixing the holding frame to the fixed frame using the screw member.

  In the following description, as shown in FIG. 1, when the digital camera is held in an upright position, the left-right direction of the camera is the X direction, the up-down direction orthogonal to the X direction is the Y direction, and is orthogonal to the X, Y direction. The front-rear direction to be performed is the Z direction. The Z direction is a direction parallel to the optical axis O1 of the subject luminous flux (the thickness direction of the digital camera 1). In the Z direction, the subject side of the camera body 1 is the front side (front side), and the photographer side is the rear side ( Back side).

  The digital camera 1 is a digital camera that includes an imaging optical system unit 100 therein. The digital camera 1 includes an exterior member that forms a housing having a substantially rectangular parallelepiped box shape, and various types of components that are assembled inside the exterior member. This is mainly composed of structural members such as assemblies and electric circuits, and various information input / output members disposed on the surface of the housing and electrically or mechanically connected to the internal structural members. .

  Specifically, as shown in FIG. 1, the digital camera 1 of the present embodiment is formed so as to cover the front surface, both side surfaces, the top surface, and the bottom surface, and mainly the back surface side. And a box-shaped housing combined with the back cover member 3. An imaging optical system unit 100 is disposed at a predetermined portion inside the casing.

  On the front surface of the digital camera 1, there are provided a photographing window 21, a flash light emitting device 4, and the like for allowing a subject light beam to enter the imaging optical system unit 100 disposed therein.

  Operation members such as a shutter button 5 and a power operation button 6 are disposed on the upper surface of the digital camera 1. Although not shown, a strap mounting bracket, a power supply battery, and a storage chamber for storing a recording medium are provided on the side surface of the digital camera 1.

  Also, on the back of the digital camera 1, for example, a zoom operation button, an operation mode setting button, a shooting / playback operation switching button, a menu display operation button, a shooting area switching button (macro button), a strobe mode switching button, a self-timer There are provided a plurality of operation members such as buttons and exposure correction switching buttons for the user to input various operations to be performed during the photographing operation and the reproduction operation of the digital camera 1. In addition, an image display device that displays and outputs information including a liquid crystal display device, an EL display device, and the like is provided on the back surface of the digital camera 1.

  As shown in FIG. 2, the imaging optical system unit 100 causes the subject luminous flux incident from the photographing window 21 provided on the front surface of the digital camera 1 to be substantially perpendicular to the Y direction downward by the reflecting surface 101 a of the reflecting member 101. A structure having a so-called folding optical system (bending optical system) that bends and forms a subject image on the light receiving surface of a CCD 109 that is an image pickup device disposed on the bottom surface side of the digital camera 1 with the light receiving surface facing upward. Has been. In the present embodiment, the reflecting member 101 is a right-angle prism, but the reflecting member 101 may be constituted by another optical member having a reflecting surface constituted by a flat surface or a curved surface.

  Hereinafter, the optical axis of the subject luminous flux that passes through the photographing window 21 and enters the imaging optical system unit 100 is referred to as a first optical axis O1, and the first optical axis O1 is bent by the reflecting surface 101a of the reflecting member 101. The obtained optical axis is referred to as a second optical axis O2. That is, the first optical axis O1 and the second optical axis O2 are orthogonal to each other.

  The imaging optical system unit 100 drives a plurality of lens groups including lenses, prisms, filters, and the like for forming a subject image on the light receiving surface of the CCD 109, a shutter unit, and the plurality of lens groups and the shutter unit. The drive device is configured to be held by the fixed frame 120.

  Specifically, the optical system constituting the imaging optical system unit 100 of the present embodiment includes a first lens group including the reflection member 101 described above, a second lens group 102, a third lens group 103, and a fourth lens group. The lens group 104 is composed of four lens groups.

  As will be described in detail later, the first lens group including the reflecting member 101 is held by a holding frame 110 that is a frame member, and the holding frame 110 is fixed to the fixed frame 120 by a plurality of screw members 130. .

  The second lens group 102, the third lens group 103, and the fourth lens group 104 are along the second optical axis O2 along the second optical axis O2 below the first lens group, and along the second optical axis O2 by an advancing / retracting mechanism (not shown). Are held in the fixed frame 120 so as to be movable forward and backward. A CCD 109 is disposed below the fourth group lens 104.

  In addition, a shutter unit 105 is disposed between the second group lens 102 and the third group lens 103 on the second optical axis O2. The fixed frame 120 is provided with a focusing motor 106, a zooming motor 107, and a shutter drive motor (not shown) as drive devices.

  For example, during the focusing operation of the digital camera 1, the fourth lens group 104 is moved back and forth along the optical axis O <b> 2 by the rotation of the focusing motor 106. Further, during the zoom operation of the digital camera 1, the second group lens frame 102 and the third group lens 103 are moved back and forth along the second optical axis O2 by the rotation of the zooming motor 107.

  The imaging optical system unit 100 having the above-described configuration is held in the housing of the digital camera 1 including the front cover member 2 and the back cover member 3 via a buffer member having elasticity or viscoelasticity such as rubber or urethane. Yes.

  Below, the structure which fixes the holding frame 110 to the fixed frame 120 in the imaging optical system unit 100 of the digital camera 1 of the present embodiment will be described in detail.

  The holding frame 110 is a frame-like member that holds the incident surface and the emission surface, which are two surfaces orthogonal to each other, of the reflecting member 110 formed of a right-angle prism so as to be exposed forward and downward, respectively. The holding frame 110 is made of a resin, a composite material, or the like, and is made of a kind of resin generally called an engineering plastic such as an ABS resin.

  The holding frame 110 is formed with a plate-like fixing piece 111 extending in both directions along an axis orthogonal to the first optical axis O1 and the second optical axis O2, that is, in both the left and right directions. The fixing piece 111 of the holding frame 110 has a plurality of circular through holes 112 penetrating in parallel to the second optical axis O2.

  The plurality of through holes 112 are disposed so as to surround the reflection member 101 held by the holding frame 110 when viewed from the direction along the second optical axis O2. In the present embodiment, two through holes 112 are formed in the fixed piece 111 extending leftward from the holding frame 110, and one through hole 112 is formed in the fixed piece 111 extending rightward from the holding frame 110. It is installed.

  Further, the fixing piece 111 is provided with a fitting hole 113 into which a positioning pin 123 erected on a fixing frame 120 described later is fitted. One fitting hole 113 is formed on each of the left and right sides so as to sandwich the reflecting member 101 when viewed from the direction along the second optical axis O2.

  The fixed frame 120 is a frame-shaped member formed so that a plurality of lens groups and a driving device for driving the plurality of lens groups can be disposed inside as described above. The fixed frame 120 is made of a resin or a composite material, and is made of a kind of resin generally called an engineering plastic such as an ABS resin.

  A flat surface portion 124 facing the fixed piece 111 of the holding frame 110 is formed on the upper surface portion 121 of the fixed frame 120 where the holding frame 110 is fixed. The flat surface portion 124 includes a holding frame. A plurality of pilot holes 122 having a diameter smaller than that of the plurality of through holes 112 are formed at positions coaxial with the plurality of through holes 112 of 110. In the present embodiment, the pilot holes 122 are formed at three locations corresponding to the three through holes 112. In addition, a pair of positioning pins 123 are erected on the flat surface portion 124 of the fixed frame 120 at positions corresponding to the fitting holes 113 of the holding frame 110.

  The screw member 130 is made of a material harder than the resin constituting the holding frame 110 and the fixed frame 120, such as resin, metal, wood, or composite material, and two screw portions are coaxially formed in series. . The two screw portions constituting the screw member 130 have a male screw shape called a tapping screw, a self-tapping screw, a tap tight (registered trademark), or the like that enters the pilot hole while being tapped by itself. .

  Specifically, as shown in FIG. 4, the screw member 130 includes a first tapping screw portion 131 formed on the distal end side and having a screw thread outer diameter d1 and a thread pitch p1. The first tapping screw 131 and the second tapping screw portion 132 formed on the proximal end side on the same axis and having a screw thread outer diameter d2 and a screw thread pitch p2 are provided. The twist direction of the first tapping screw part 131 and the second tapping screw part 132 is the same, and is the forward screw direction in this embodiment.

  Here, the outer diameter d2 of the second tapping screw portion 132 is larger than the outer diameter d1 of the first tapping screw portion 131, and the pitch p2 of the second tapping screw portion 132 is the same as that of the first tapping screw portion 131. Greater than the pitch. That is, in this embodiment, the relationship of d1 <d2 and p1 <p2 is established.

  Further, the outer diameter d1 of the first tapping screw portion 131 is smaller than the inner diameter of the through hole 112 formed in the holding frame 110 and is screwed into the pilot hole 122 formed in the fixed frame 120. It is set so that it can enter the pilot hole 122 while tapping. Further, the length of the first tapping screw part 131 is set to be longer than the thickness of the fixed piece 111 in which the through hole 112 of the holding frame 110 is formed.

  On the other hand, the outer diameter d2 of the second tapping screw portion 132 can be inserted into the through hole 112 while being tapped when being screwed into the through hole 112 formed in the holding frame 110. Is set to

  In the present embodiment, as shown in FIG. 4, the first tapping screw portion 131 of the screw member 130 is screwed into the prepared hole 122 formed in the fixed frame 120, and the second tapping screw portion 132 is formed. The holding frame 110 is fixed to the fixed frame 120 by being screwed into a through hole 112 formed in the holding frame 110. At this time, the fixed piece 111 of the holding frame 110 and the fixed frame 120 are separated by a predetermined distance A.

  Hereinafter, an operation procedure for fixing the holding frame 110 to the fixed frame 120 using the screw member 130 described above will be described.

  First, as shown in FIG. 5, the fixing piece 111 of the holding frame 110 and the fixing frame 120 are brought into contact with each other, and the screw member 130 is rotated with respect to the through hole 112 and the lower hole 122 arranged on the same axis. Screw in.

  Here, the first tapping screw portion 131 formed on the distal end side of the screw member 130 has a smaller diameter than the inner diameter of the through hole 112 and the thickness of the fixing piece 111, that is, the depth of the through hole 112. Since it is formed long, the first tapping screw portion 131 is screwed into the pilot hole 122 before the second tapping screw portion 132 is screwed into the through hole 112.

  When the screw member 130 is further turned to screw the first tapping screw portion 131 into the pilot hole 122, the second tapping screw portion 132 is next screwed into the through hole 112.

  Here, since the pitch p2 of the second tapping screw portion 132 is larger than the pitch p1 of the first tapping screw portion 131, the holding frame 110 is separated from the fixed frame 120 by the difference in pitch. Specifically, like the operation of the so-called differential screw, each time the screw member 130 is rotated once in the screwing direction, the holding frame 110 and the fixed frame 120 are increased by the difference (p2−p1) between the pitch p2 and the pitch p1. And the distance A increases.

  As described above, in the imaging optical system unit 100 of the digital camera 1 of the present embodiment, the holding frame 110 that holds the reflecting member 101 has the reflecting member 101 when viewed from the direction along the second optical axis. At the three enclosing positions, the fixing frame 120 is fixed by a screw member 130 having two tapping screw portions.

  That is, the holding frame 110 is supported by the screw member 130 at three points with respect to the fixed frame. In this embodiment, the distance A between the holding frame 110 and the fixed frame 120 can be independently changed by rotating the screw member 130 at each of the three support positions as described above. It is.

  Further, since the amount of change in the distance A between the holding frame 110 and the fixed frame 120 per one rotation of the screw member 130 is the difference between the pitch p2 and the pitch p1, for example, a single pitch push screw or pull screw Thus, the amount of change per rotation can be set smaller than when the distance between the holding frame 110 and the fixed frame 120 is adjusted.

  Therefore, in the imaging optical system unit 100 of the digital camera 1 of the present embodiment, the angle of the holding frame 110 with respect to the fixed frame 120 can be adjusted accurately and easily. In other words, according to the present embodiment, in the imaging optical system unit 1 having the reflecting member 101, the screwing amount of the screw member 130 is changed without adjusting the angle of the reflecting member 101 without using another member such as a spacer. It can be carried out easily and with less man-hours.

  Further, in the present embodiment, the screw member 130 that adjusts the distance A between the holding frame 110 and the fixed frame 120 has the first tapping screw portion 131 and the second tapping screw portion 132 at the same time. The fixing frame 120 and the holding frame 110 are also fixed by being screwed into the 110.

  This is different from a male screw portion screwed into a normal female screw portion, and the first tapping screw portion 131 and the second tapping screw portion 132 have no gap so as to bite into the prepared hole 122 and the through hole 112. It is because it is screwed in a state. In particular, the fixing frame 120 and the holding frame 110 are made of resin, and the first tapping screw portion 131 and the second tapping screw portion 132 are tightened by the restoring force due to the elasticity thereof, so that the fixing of both becomes stronger. .

  Therefore, the imaging optical system unit 100 of the digital camera 1 according to the present embodiment of the present embodiment can easily adjust the angle of the reflecting member 101, and even after an impact is input after the adjustment, It has high impact resistance that does not shift its angle.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a cross-sectional view showing the relationship among the holding frame, the fixed frame, and the screw member in the second embodiment. FIG. 7 is a diagram illustrating a procedure for fixing the holding frame to the fixed frame using the screw member according to the second embodiment.

  The second embodiment differs from the above-described first embodiment only in the shape of the screw member in the imaging optical system unit 100 and the work procedure for fixing the holding frame 110 to the fixed frame 120. Therefore, only this difference will be described below, and the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

  As shown in FIG. 6, the screw member 140 according to the second embodiment includes a first tapping screw portion 141 formed on the distal end side and having a screw thread outer diameter d3 and a thread pitch p3, The first tapping screw 141 and a second tapping screw portion 142 formed on the proximal end on the same axis and having a screw thread outer diameter of d4 and a screw thread pitch of p4 are configured. The twist direction of the first tapping screw portion 141 and the second tapping screw portion 142 is the same, and is the forward screw direction in this embodiment.

  Here, the outer diameter d4 of the second tapping screw portion 142 is larger than the outer diameter d2 of the first tapping screw portion 141, and the pitch p4 of the second tapping screw portion 142 is the same as that of the first tapping screw portion 141. Smaller than the pitch. That is, in this embodiment, the relationship d3 <d4, p3> p4 is established.

  In addition, the outer diameter d3 of the first tapping screw portion 141 is smaller than the inner diameter of the through hole 112 formed in the holding frame 110 and is screwed into the pilot hole 122 formed in the fixed frame 120. It is set so that it can enter the pilot hole 122 while tapping.

  On the other hand, the outer diameter d4 of the second tapping screw portion 142 can be inserted into the through hole 112 while being tapped when being screwed into the through hole 112 formed in the holding frame 110. Is set to

  In this embodiment, as shown in FIG. 6, the first tapping screw portion 141 of the screw member 140 is screwed into the prepared hole 122 formed in the fixed frame 120, and the second tapping screw portion 142 is The holding frame 110 is fixed to the fixed frame 120 by being screwed into a through hole 112 formed in the holding frame 110. At this time, the fixed piece 111 of the holding frame 110 and the fixed frame 120 are separated by a predetermined distance A.

  Hereinafter, an operation procedure for fixing the holding frame 110 to the fixed frame 120 using the above-described screw member 140 will be described.

  First, as shown in FIG. 7, the second tapping screw portion 142 of the screw member 140 is screwed into the through hole 112 formed in the fixing piece 111 of the holding frame 110 by turning a predetermined amount.

  Then, the screw member 140 is rotated in a state where the tip end portion of the first tapping screw portion 141 is in contact with the upper end of the lower hole 122 of the fixing frame 120, and the first tapping screw portion 141 is screwed into the lower hole 122.

  Here, since the pitch p4 of the second tapping screw portion 142 is smaller than the pitch p2 of the first tapping screw portion 141, the holding frame 110 is fixed to the fixed frame according to the rotation of the screw member 140 by this pitch difference. Approach 120. Specifically, in the same manner as the operation of the so-called differential screw, each time the screw member 140 is rotated in the screwing direction, the holding frame 110 and the fixed frame 120 are increased by a difference (p3-p4) between the pitch p3 and the pitch p4. And the distance A becomes smaller.

  As described above, in the present embodiment, the direction of change in the distance A between the holding frame 110 and the fixed frame 120 when the screw member 140 is rotated in the screwing direction as compared with the first embodiment described above. Is different. Since the effect of this embodiment is the same as that of the first embodiment, the description thereof is omitted.

  The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the scope or spirit of the invention that can be read from the claims and the entire specification. A camera is also included in the technical scope of the present invention.

  The digital camera according to the present invention is not limited to the embodiment described in the above embodiment, and is distributed to electronic devices such as a recording device, a mobile phone, a PDA, a game machine, a digital video camera, a digital media player, a television, a GPS, and a clock. Needless to say, the image pickup apparatus may be provided.

It is a perspective view which shows the digital camera front side. It is a figure explaining the structure of an imaging optical system unit. It is a figure explaining the structure which fixes a holding frame to a fixed frame. It is a figure which shows the relationship between a holding frame, a fixed frame, and a screw member in a cross section. It is a figure explaining the procedure which fixes a holding frame to a fixed frame using a screw member. It is a figure which shows the relationship between the holding frame in a 2nd Embodiment, a fixed frame, and a screw member in a cross section. It is a figure explaining the procedure which fixes a holding frame to a fixed frame using the screw member in a 2nd embodiment. It is a figure explaining the structure of the imaging optical system unit of the conventional digital camera which has a bending optical system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Digital camera, 100 Imaging optical system unit, 101 Reflective member, 101a Reflective surface, 110 Holding frame, 111 Fixed piece, 112 Through hole, 113 Fitting hole, 120 Fixed frame, 121 Upper surface part, 122 Bottom hole, 123 Positioning pin , 124 plane part, 130 screw part seat right, 131 first tapping screw part, 132 second tapping screw part

Claims (3)

A reflective member having a reflective surface that bends the first optical axis to a second optical axis perpendicular to the first optical axis;
A resin holding frame for holding the reflecting member;
A lens group disposed along the second optical axis;
A resin fixed frame for holding the lens group;
The holding frame is a digital camera having an imaging optical system unit fixed to the fixed frame by a plurality of screw members in a housing,
The screw member is
A first tapping screw portion formed on one end side;
It is formed on the other end side coaxial with the first tapping screw portion, has the same twisting direction as the first tapping screw portion, has an outer diameter larger than that of the first tapping screw portion, and the first tapping screw portion. A second tapping screw portion having a pitch different from that of the first tapping screw portion,
The holding frame and the fixed frame are
When viewed from the direction along the second optical axis, the first tapping screw portion is screwed into a pilot hole formed in the fixed frame at at least three locations around the reflecting member, and the second The digital camera is characterized in that the tapping screw portions are fixed to each other in a state of being screwed into a through hole formed in the holding frame.   The digital camera according to claim 1, wherein the second tapping screw portion has a pitch larger than that of the first tapping screw portion.   The digital camera according to claim 1, wherein the second tapping screw portion has a pitch smaller than that of the first tapping screw portion.

Images