JP2006276168A - Imaging apparatus and prism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a prism and an imaging apparatus which are designed such that the prism having a lens face can be precisely positioned relative to the other member with ease. <P>SOLUTION: A prism lens 2 according to the invention has the lens face 2a and a engaging section 2b. The lens face 2a has a predetermined power. The engaging section 2b is formed on the side where the lens face 2a is located. The engaging section 2b can be fitted on the other member. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an imaging device and a prism, and can be applied to, for example, a prism that can bend an optical axis at a substantially right angle and an imaging device having the prism.

  Imaging devices have been mounted on mobile devices such as mobile phones. The imaging apparatus includes a prism that can bend the optical axis. The presence of the prism makes it possible to reduce the thickness of the mobile device on which the imaging device is mounted as viewed from the subject side.

  In recent years, plastic molded prisms have been used. Further, by using the reflecting surface or transmitting surface of the prism as a lens surface, the number of lenses is reduced, the manufacturing cost is reduced, and the size is reduced by shortening the optical path length.

  In the case of a right-angle prism having no lens surface, it is only necessary to consider mainly the position and inclination of the reflecting surface when positioning and fixing the prism. However, when the prism having the lens surface is positioned and fixed, unlike the right-angle prism, positioning and fixing in consideration of an optical axis deviation from the optical axis of other lenses is required.

  For example, in Patent Document 1, as can be seen from the drawing, a plurality of protrusions are formed on a housing for fixing a lens or the like. In the technique according to Patent Document 1, the prism having a lens surface is brought into close contact with the protrusion, thereby positioning and fixing the prism.

  Patent Document 2 is an invention related to a viewfinder device, and the prism is positioned and fixed by pressing the surface of the housing against the lens surface of the prism.

JP 2004-133053 A Japanese Patent Laid-Open No. 11-44905

  When positioning and fixing a prism having a lens surface to a housing, as described above, in addition to the position and inclination of the reflecting surface, it is necessary to perform positioning and fixing in consideration of an optical axis deviation from the optical axis of other lenses. Become. That is, it is required to increase the accuracy of the dimensions of a fixing member or the like that fixes the prism.

  However, as in Patent Document 1, it is very difficult to accurately form a plurality of protrusions on the housing. This is because a mold for forming the casing having the plurality of protrusions is very complicated. Moreover, when the said metal mold | die was created, there also existed a problem that manufacturing cost became huge.

  In the case of Patent Document 2, the prism is positioned and fixed by pressing the surface of the housing against the lens surface of the prism. Accordingly, the dimensional accuracy and levelness of the surface of the housing are very important.

  However, it has been very difficult to form a surface with high accuracy and high levelness (that is, the surface is not wavy) over the same area as the lens surface. .

  As described above, in the inventions according to Patent Documents 1 and 2, it is very difficult to accurately position and fix the prism having the lens surface.

  Therefore, an object of the present invention is to provide an imaging device and a prism that can accurately and easily position a prism having a lens surface with respect to other members.

  In order to achieve the above object, an image pickup apparatus according to claim 1 of the present invention includes an image pickup device that converts an optical image formed on a light receiving surface into an electric signal, and an image of a subject connected to the light receiving surface. At least one or more lenses to be imaged, a lens surface formed on at least one of a transmission surface and a reflection surface, and formed on the side where the lens surface exists, and substantially parallel to the optical axis direction of the lens surface A first fitting portion that can be fitted with another member and formed on the side where the lens surface exists, and is substantially in the optical axis direction of the lens surface. A prism having an optical axis direction positioning surface made of a vertical surface, and the lens facing the lens surface of the prism is the other member, and the lens includes the first member The second fitting part that can be fitted with the fitting part is formed. To have.

  According to a second aspect of the present invention, there is provided an imaging device according to the present invention, wherein an imaging element that converts an optical image formed on a light receiving surface into an electric signal, and at least one image that forms an image of a subject on the light receiving surface. A lens, a lens surface formed with at least one of a transmissive surface and a reflective surface, and a fitting formed on the side where the lens surface is present and substantially parallel to the optical axis direction of the lens surface A light having a surface and a first fitting portion that can be fitted with another member; and a surface that is formed on a side where the lens surface is present and is substantially perpendicular to the optical axis direction of the lens surface. A prism having an axial positioning surface; and a housing for fixing the lens. The housing includes a second fitting portion that can be fitted to the first fitting portion. The other member is formed.

  According to a fourth aspect of the present invention, there is provided a prism according to the present invention, wherein the prism surface is formed on at least one of a transmission surface and a reflection surface, and is formed on a side where the lens surface is present. The fitting surface has a fitting surface that is substantially parallel to the axial direction, and is formed on the side where the fitting surface is fitted with another member and the lens surface, and the optical axis direction of the lens surface And an optical axis direction positioning surface comprising a surface substantially perpendicular to the surface.

  An image pickup apparatus according to claim 1 of the present invention includes an image pickup element that converts an optical image formed on a light receiving surface into an electric signal, at least one lens that forms an image of a subject on the light receiving surface, A lens surface formed on at least one of a transmissive surface and a reflective surface; and a fitting surface formed on a side where the lens surface exists, and a surface substantially parallel to the optical axis direction of the lens surface. An optical axis direction positioning surface formed by a first fitting portion that can be fitted with another member and a surface that is formed on the side where the lens surface exists and is substantially perpendicular to the optical axis direction of the lens surface The lens facing the lens surface of the prism is the other member, and the lens can be fitted with the first fitting portion. Since the two mating parts are formed, other members (i.e. Accurately positioned and fixed prism for a lens) facing the lens surface of the prism (i.e., enables positioning and fixing with a suppressed eccentricity deviation, etc.), also it can be easily performed.

  According to a second aspect of the present invention, there is provided an imaging device that converts an optical image formed on a light receiving surface into an electrical signal, at least one lens that forms an image of a subject on the light receiving surface, and a transmission surface. And a lens surface formed on at least one of the reflecting surfaces, and a fitting surface formed on a side where the lens surface exists, and a surface substantially parallel to the optical axis direction of the lens surface, A first fitting portion that can be fitted with another member, and an optical axis direction positioning surface that is formed on a side where the lens surface exists and is substantially perpendicular to the optical axis direction of the lens surface; And a housing that fixes the lens, and the housing includes a second fitting portion that can be fitted to the first fitting portion. Since the member is formed, positioning and fixing of the prism with respect to the housing is accurate ( Mari, enables positioning and fixing with a suppressed eccentricity deviation, etc.), also it can be easily performed.

  The prism according to claim 4 is formed on at least one of the transmission surface and the reflection surface, the lens surface and the side where the lens surface exists, and the prism surface is in the optical axis direction. And is formed on the side where the lens surface exists, and is substantially in the optical axis direction of the lens surface. Since the optical axis direction positioning surface comprising a vertical surface is provided, it is possible to easily fix the position of the prism while suppressing the optical axis positional deviation and eccentricity deviation of the lens surface.

  Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.

<Embodiment 1>
FIG. 1 is a cross-sectional view of imaging device 100 according to the present embodiment as viewed from above. FIG. 2 is a cross-sectional view of the imaging apparatus 100 according to the present embodiment as viewed from the front direction (subject direction).

  As shown in FIGS. 1 and 2, the imaging device 100 includes a first lens group 10, a second lens group 20, a third lens group 30, an infrared light cut filter 40, and an imaging element 50. Yes.

  Here, the image sensor 50 is an element that can convert an optical image formed on the light receiving surface into an electric signal.

  The plurality of lenses (first lens group 10, second lens group 20, and third lens group 30) are members that form an image of a subject on the light receiving surface of the image sensor 50.

  The first lens group 10 has a function of turning the optical axis back in the vertical direction (in FIG. 1, from the optical axis 60 to the optical axis 70). The first lens group 10 includes a first lens 1, a prism lens 2, and a second lens 3. The first lens 1 is disposed on the subject side, and the second lens 3 is disposed on the imaging element 50 side. The prism lens 2 is disposed between the first lens 1 and the second lens 3.

  Here, the prism lens 2 has a reflecting surface and a bending function. In addition, one of the transmission surface and the reflection surface of the prism lens 2 is a lens surface having a predetermined power. In the present embodiment, the transmission surface facing the second lens 3 of the prism lens 2 is a lens surface and has a positive power.

  The first lens 1 is held and fixed by a first lens holding frame 15. In addition, the first lens holding frame 15 also has a function of limiting incident light to the imaging device 100.

  The second lens group 20 includes a third lens 4, a fourth lens 5, and an aperture stop 6. Here, the aperture stop 6 is a member that limits the width of incident light.

  The aperture stop 6, the third lens 4, and the fourth lens 5 are arranged in this order from the subject side toward the image sensor 50 side. The second lens group 20 is positioned and fixed by the second lens group holding frame 17.

  The third lens group 30 includes the fifth lens 7. Here, the third lens group 30 is positioned and fixed by the third lens group holding frame 18.

  Further, an infrared light cut filter 40 is disposed between the third lens group 30 and the image sensor 50. Here, the infrared light cut filter 40 has a function of blocking infrared light included in incident light. The infrared light cut filter 40 and the image sensor 50 are mounted and fixed in the image sensor package 19.

  The centers of the lenses 1 to 5 and 7 and the center of the image sensor 50 coincide with the optical axis 60 and the optical axis 70 that are the optical central axes of the image capturing apparatus 100. Further, the first lens holding frame 15, a prism pressing member 16, which will be described later, and the image pickup device package 19 are each fixed by an outer casing 25.

  Accordingly, the first lens group 10 is positioned and fixed by the outer casing 25 via the first lens holding frame 15 and the prism pressing member 16.

  As shown in FIG. 2, two guide shafts 35 are provided in the imaging apparatus 100. Here, the guide shafts 35 are arranged at a predetermined distance from each other, and are parallel to each other. Further, the guide shaft 35 is disposed so as to be substantially parallel to the direction of the optical axis 70.

  The second lens group holding frame 17 and the third lens group holding frame 18 are configured to be able to move on the guide shaft 35.

  With this configuration, the second lens group 20 and the third lens group 30 can move in the direction of the optical axis 70, and movement in other directions is restricted. A uniaxial drive device 36 is fixed to the outer casing 25, and the second lens group 20 and the third lens group 30 are movable in the direction of the optical axis 70 by the driving force of the uniaxial drive device 36. To do.

  Therefore, the second lens group 20 and the third lens group 30 are positioned in the optical axis eccentric direction via the second lens holding frame 17, the third lens holding frame 18 and the guide shaft 35. .

  Next, a method for positioning and fixing the prism lens 2 having a lens surface in the imaging apparatus 100 configured as described above will be described. In the following description, the case where the second lens 3 is positioned and fixed by the outer casing 25 and the prism lens 2 is positioned and fixed by the outer casing 25 via the second lens 3 will be described.

  First, the configuration of the second lens 3 will be described with reference to FIG.

  The second lens 3 is a plastic molded product. As shown in FIG. 3, the lens surface 3a, the eccentric direction positioning surface 3b, the eccentric direction auxiliary positioning portion 3c, the optical axis direction positioning surface 3d, the fitting portion 3e, And a prism side optical axis direction positioning surface 3f.

  Here, the lens surface 3a has a predetermined power. Further, the eccentric direction positioning surface 3b has a planar shape rounded along the arc of the lens surface 3a. The optical axis direction positioning surface 3d is a plane substantially perpendicular to the optical axis of the lens surface 3a.

  The fitting portion 3e has a convex shape and is a portion that can be fitted with the fitting portion formed on the prism lens 2. The forming direction of the fitting portion 3e is substantially parallel to the optical axis direction of the lens surface 3a. The prism-side optical axis direction positioning surface 3f is formed on the side opposite to the optical axis direction positioning surface 3d formation side (that is, the prism side) and is a plane substantially perpendicular to the optical axis of the lens surface 3a. .

  Next, positioning and fixing of the second lens 3 with respect to the outer casing 25 will be described with reference to FIG. FIG. 4 is a diagram illustrating a state in which the second lens 3 is positioned and fixed by the outer casing 25.

  As shown in FIG. 4, the outer casing 25 is formed with an opening 25a at a portion facing the lens surface 3a. Further, the outer casing 25 is formed with a recessed region so that the second lens 3 is fitted therein. In the recessed area, an eccentric direction positioning surface 25b and an optical axis direction positioning surface 25c are formed.

  Here, like the eccentric direction positioning surface 3b of the second lens 3, the eccentric direction positioning surface 25b has a rounded planar shape. The optical axis direction positioning surface 25 c is a plane that is substantially perpendicular to the optical axis of the second lens 3.

  As shown in FIG. 4, when the second lens 3 is fixed to the outer casing 25, the second lens 3 is fitted (inserted) into the recessed area.

  That is, the eccentric direction positioning surface 25b of the outer casing 25 is brought into contact with the eccentric direction positioning surface 3b of the second lens 3, and the optical axis direction positioning surface 25c of the outer casing 25 is set to the second position. The lens 3 is brought into contact with the positioning surface 3d in the optical axis direction. Note that, in the above-described fitted state of the second lens 3, the eccentric direction auxiliary positioning portion 3 c of the second lens 3 comes into contact with the upper inner wall of the outer casing 25 to assist in positioning and fixing.

  The second lens 3 is positioned and fixed with respect to the outer casing 25 by fitting the second lens 3 into the outer casing 25 described above. That is, the second lens 3 is positioned and fixed with respect to the outer casing 25 so that the eccentric direction with respect to the optical axis and the position in the optical axis direction are appropriate positions.

  Here, the positioning in the eccentric direction with respect to the optical axis is performed by contacting the eccentric direction positioning surface 3b of the second lens 3 with the eccentric direction positioning surface 25b of the outer casing 25, and deviating the second lens 3. This is performed by contacting the upper auxiliary wall of the outer casing 25 of the core direction auxiliary positioning portion 3c.

  Positioning in the optical axis direction is performed by contacting the optical axis direction positioning surface 3d of the second lens 3 with the optical axis direction positioning surface 25c.

  It should be noted that the second lens 3 is lightly fitted to prevent the lens member from being scraped or burr bite generated when the second lens 3 is fitted into the recessed region of the outer casing 25. It is desirable to carry out under pressure.

  Next, positioning and fixing of the prism lens 2 with respect to the second lens 3 will be described.

  First, the detailed structure of the prism lens 2 having a lens surface will be described with reference to FIG.

  The prism lens 2 is a plastic molded product, and has a lens surface 2a, a fitting portion 2b, a pressing surface 2c, an optical axis direction positioning surface 2d, and the like, as shown in FIG.

  Here, the lens surface 2a has a predetermined power.

  The fitting portion 2b is formed on the side where the lens surface 2a is formed. Further, the fitting portion 2 b is a concave shape and is a portion that can be fitted with the fitting portion 3 e of the second lens 3. The forming direction of the fitting portion 2b is substantially parallel to the optical axis direction of the lens surface 2a (that is, a surface substantially parallel to the optical axis direction of the lens surface 2a (side surface of the fitting portion 2b)). Has a mating surface). Further, in plan view, a part of the contour of the fitting portion 2b has an arc shape along the lens contour of the lens surface 2a, as shown in FIG. Moreover, the side surface of the fitting part 2b has a taper shape which inclines along a fitting direction.

  Accordingly, the fitting portion 3e of the second lens 3 fitted to the fitting portion 2b is also arc-shaped in a plan view. The side surface of the fitting portion 3e of the second lens 3 has a tapered shape that is inclined along the fitting direction.

  The optical axis direction positioning surface 2d is formed on the side where the lens surface 2a is formed, and is connected to the fitting portion 2b. The optical axis direction positioning surface 2d is a plane that is substantially perpendicular to the optical axis direction of the lens surface 2a.

  The pressing surface 2c is formed on the side opposite to the forming side of the fitting portion 2b. The pressing surface 2c is a surface that is substantially perpendicular to the optical axis direction of the lens surface 2a. The pressing surface 2c is formed at two locations on the surface opposite to the optical axis direction positioning surface 2d.

  Next, positioning and fixing of the prism lens 2 with respect to the second lens 3 will be described with reference to FIG. FIG. 6 is a diagram illustrating a state in which the prism lens 2 is positioned and fixed by the second lens 3.

  As shown in FIG. 6, the fitting portion 3e of the second lens 3 and the fitting portion 2b of the prism lens 2 are fitted. At this time, the prism-side optical axis direction positioning surface 3 f of the second lens 3 is in contact with the optical axis direction positioning surface 2 d of the prism lens 2. Here, the fitting is performed with as little gap as possible.

  By the above-described fitting between the prism lens 2 and the second lens 3, positioning and fixing between the lenses 2 and 3 are performed in consideration of the deviation of the optical axis. That is, the prism lens 2 is positioned and fixed with respect to the second lens 3 so that the eccentric direction with respect to the optical axis and the position in the optical axis direction are appropriate positions.

  Here, the positioning in the eccentric direction with respect to the optical axis is performed by fitting the fitting portion 3e of the second lens 3 and the fitting portion 2b of the prism lens 2 together. The positioning in the optical axis direction is performed by contacting the prism side optical axis direction positioning surface 3 f of the second lens 3 and the optical axis direction positioning surface 2 d of the prism lens 2.

  Although not shown in FIG. 6, the second lens 3 is positioned and fixed by the outer casing 25. Therefore, the prism lens 2 is fixed by the outer casing 25 via the second lens 3 by the fitting with the second lens 3.

  Further, in order to complete the fitting of the prism lens 2 and the second lens 3, the imaging device 100 according to the present embodiment is provided with a prism pressing member 16 as shown in FIG. ing.

  The prism pressing member 16 is a member that can press the pressing surface 2c of the prism lens 2 from the optical axis direction of the lens surface 2a.

  After fitting the fitting portion 2b of the prism lens 2 to the fitting portion 3e of the second lens 3 fixed to the outer casing 25, the two formed on the prism pressing member 16 The rectangular convex portion 16 a is abutted perpendicularly to the pressing surface 2 c of the prism lens 2.

  By the pressing process using the pressing prism member 16, the prism lens 2 can be completely fitted (positioned and fixed) to the second lens 3.

  As shown in FIG. 2, the prism pressing member 16 is bonded and fixed to the outer casing 25 in a state where the prism lens 2 is abutted (pressed).

  As described above, in the imaging device 100 according to the present embodiment, the prism lens 2 is positioned and fixed by fitting with the second lens 3.

  Therefore, the prism lens 2 having a lens surface can be accurately and easily positioned with respect to the second lens 3. In particular, the fitting in the optical axis direction can prevent the optical axis of the lens surface 2 a of the prism lens 2 from decentering from the optical axis of the second lens 3.

  A fitting portion 2b is formed on the side of the prism lens 2 where the lens surface 2a is formed. Therefore, it is possible to improve the processing accuracy of the mold used when forming the prism lens 2 having the configuration. This is due to the following reason.

  When the prism lens 2 is processed using a mold, a plurality of mold parts are combined, and in the combined state, a liquid that is a raw material of the prism lens 2 is poured. In this case, when the lens surface 2a and the fitting portion 2b belong to different mold parts, a positional shift occurs due to the combination of the molds.

  However, since the lens surface 2a and the fitting portion 2b exist on the same surface side as in the present embodiment, the lens surface 2a and the fitting portion 2b can belong to the same mold part. Therefore, it is possible to prevent positional deviation due to the combination of mold parts. Therefore, the prism lens 2 can be positioned and fixed with respect to the second lens 3 with higher accuracy.

  The position of the second lens 3 is fixed with respect to the outer casing 25. Therefore, the position of the prism lens 2 is also fixed to the outer casing 25 via the second lens 3.

  Further, it is not necessary to use an adhesive when the prism lens 2 and the second lens 3 are fitted. Therefore, it is possible to prevent deterioration in positioning accuracy due to the adhesive.

  Further, in imaging device 100 according to the present embodiment, a curved portion is formed in a part of the contour of fitting portions 2b and 3e in plan view.

  By making the shapes of the fitting portions 2b and 3e as described above, the fitting can be performed smoothly. In addition, because the mold is created by a lathe or the like, the fitting accuracy of the mold is improved in the fitting portions 2b and 3e having a curved shape in part than in the rectangular fitting portions 2b and 3e. Therefore, as a result, the positioning accuracy of the prism lens 2 and the second lens 3 can be improved.

  Further, in the imaging device 100 according to the present embodiment, the prism lens 2 is formed with a pressing surface 2c that is a plane substantially perpendicular to the optical axis, and the optical axis with respect to the pressing surface 2c. A prism pressing member 16 capable of applying a force from the direction is provided.

  Therefore, the prism lens 2 and the second lens 3 can be more reliably fitted. Therefore, positioning of the prism lens 2 in the optical axis direction can be performed with higher accuracy.

  Moreover, the fitting part 2b etc. of the prism lens 2 have the taper shape which inclines along the said fitting direction. Accordingly, the prism lens 2 and the second lens 3 can be fitted more smoothly.

  In the above description, the prism lens 2 is fixed to the second lens 3 itself. However, it is not necessary to directly fix the prism lens 2 to the second lens 3 itself.

  That is, between the lens surface 2 a of the prism lens 2 and the second lens 3, another member that can be fitted to the prism lens 2 (the other member is integrated with the outer casing 25). Forming and fitting the fitting part of the other member and the fitting part 2b of the prism lens 2 and positioning and fixing the second lens 3 with respect to the outer casing 25 indirectly. The prism lens 2 may be positioned and fixed with respect to the second lens 3.

  For example, as the part of the outer casing 25, another member that exists between the prism lens 2 and the second lens 3 and can be fitted to the prism lens 2 is provided. Since the other members are a part of the outer casing 25, the other members and the outer casing 25 are integrated.

  For example, as shown in FIG. 4, the second lens 3 is positioned and fixed with respect to the outer casing 25 having the configuration. Further, another member which is a part of the outer casing 25 and the fitting portion 2b of the prism lens 2 are fitted.

  Thus, the prism lens 2 and the second lens 3 can be directly fixed to the outer casing 25, and the positioning and fixing of the prism lens 2 with respect to the second lens 3 can be performed indirectly. it can.

  In the present embodiment, the case where the transmission surface of the prism lens 2 is a lens surface has been described. However, the reflecting surface of the prism lens 2 may be a lens surface, and a fitting portion that can be fitted with another member (for example, the outer casing 25) may be formed on the reflecting surface forming side.

It is sectional drawing which shows the whole structure of the imaging device which concerns on this invention. 1 is a front cross-sectional view illustrating an overall configuration of an imaging apparatus according to the present invention. It is a figure perspective view which shows the structure of a 2nd lens. It is a perspective view for demonstrating the mode of positioning fixation of an outer case and a 2nd lens. It is a perspective view which shows the structure of a prism lens. It is a perspective view for demonstrating the mode of the positioning fitting of a 2nd lens and a prism lens.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st lens, 2 prism lens, 2a lens surface, 2b fitting part, 2c holding surface, 2d optical axis direction positioning surface, 3nd lens, 3a lens surface, 3b eccentric direction positioning surface, 3c eccentricity Direction auxiliary positioning portion, 3d optical axis direction positioning surface, 3e fitting portion, 3f prism side optical axis direction positioning surface, 4th lens, 5th lens, 6 aperture stop, 7th lens, 10th lens 1 lens group, 15 first lens holding frame, 16 prism pressing member, 16a convex portion, 17 second lens group holding frame, 18 third lens group holding frame, 19 imaging element package, 20 second lens Group, 25 outer casing, 25a opening, 25b eccentric direction positioning surface, 25c optical axis direction positioning surface, 30 third lens group, 35 guide shaft, 36 uniaxial driving device, 40 infrared cut fill , 50 imaging element, 60, 70 optical axis.

Claims (7)

An image sensor that converts an optical image formed on the light receiving surface into an electrical signal;
At least one lens that forms an image of a subject on the light receiving surface;
A lens surface formed on at least one of a transmissive surface and a reflective surface; and a fitting surface formed on a side where the lens surface exists, and a surface substantially parallel to the optical axis direction of the lens surface. An optical axis direction positioning surface formed by a first fitting portion that can be fitted with another member and a surface that is formed on the side where the lens surface exists and is substantially perpendicular to the optical axis direction of the lens surface And a prism having
The lens facing the lens surface of the prism is the other member, and a second fitting portion that can be fitted to the first fitting portion is formed on the lens.
An imaging apparatus characterized by that. An image sensor that converts an optical image formed on the light receiving surface into an electrical signal;
At least one lens that forms an image of a subject on the light receiving surface;
A lens surface formed as at least one of a transmission surface and a reflection surface and a fitting surface formed on a side where the lens surface exists and formed by a surface substantially parallel to the optical axis direction of the lens surface. And an optical axis direction positioning comprising a first fitting portion that can be fitted with another member and a surface that is formed on the side where the lens surface exists and is substantially perpendicular to the optical axis direction of the lens surface. A prism having a surface;
A housing for fixing the lens,
In the case,
The other member having the second fitting portion that can be fitted to the first fitting portion is formed.
An imaging apparatus characterized by that. The prism is
A pressing surface formed of a surface substantially perpendicular to the optical axis direction of the lens surface, which is formed on the opposite side to the formation side of the first fitting portion;
A pressing member that presses the pressing surface from the optical axis direction of the lens surface;
The imaging apparatus according to claim 1, wherein the imaging apparatus is configured as described above. A lens surface formed as at least one of a transmission surface and a reflection surface;
A fitting portion that is formed on the side where the lens surface exists, has a fitting surface that is substantially parallel to the optical axis direction of the lens surface, and can be fitted with another member;
An optical axis direction positioning surface that is formed on a side where the lens surface exists and is substantially perpendicular to the optical axis direction of the lens surface.
Prism characterized by that. At least a part of the contour of the fitting portion is an arc shape along the lens contour of the lens surface.
The prism according to claim 4. A pressing surface formed of a surface substantially perpendicular to the optical axis direction of the lens surface, which is formed on the side opposite to the formation side of the fitting portion, is further provided.
The prism according to claim 4. The fitting surface of the fitting portion has a tapered shape that is inclined along the fitting direction.
The prism according to claim 4.

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