JP2006106626A - Prism unit and imaging apparatus using same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a prism unit wherein a pair of prisms can be accurately fixed to a prescribed position of a diaphragm member with adhesive bond. <P>SOLUTION: Regarding the prism unit 21 having the 1st and 2nd prisms 31 and 32 and the diaphragm member 33, a 1st attachment surface 40 and a 1st adhesion surface 41 are formed on one surface of the diaphragm member 33. The 1st prism 31 is positioned by the 1st attachment surface 40. The 1st adhesion surface 41 and the 1st prism 31 are fixed with the adhesive bond 42. A 1st recessed part 43 is formed in between the 1st attachment surface 40 and the 1st adhesion surface 41. A 2nd attachment surface 45 and a 2nd adhesion surface 46 are formed on the other surface of the diaphragm member 33. The 2nd prism 32 is positioned by the 2nd attachment surface 45. The 2nd adhesion surface 46 and the 2nd prism 32 are fixed with the adhesive bond 47. A 2nd recessed part 48 is formed in between the 2nd attachment surface 45 and the 2nd adhesion surface 46. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a prism unit that can be used for, for example, a digital camera, a mobile phone with a camera, and the like, and an imaging device using the prism unit.

  An image pickup apparatus using a decentered optical system has been proposed as a small image pickup apparatus usable for a digital camera or a camera-equipped mobile phone. For example, the following Patent Documents 1 to 3 describe an imaging apparatus including an imaging optical system that uses a prism formed of a free-form surface or the like.

  The aim of the techniques described in Patent Documents 1 to 3 is to form an imaging optical system using a prism, and to use a free-form surface for the light incident surface, light exit surface, or reflecting surface of the prism. Thus, a compact and high-quality image can be obtained. In particular, in Patent Document 2 (Japanese Patent Laid-Open No. 2002-196243) and Patent Document 3 (Japanese Patent Laid-Open No. 2003-84200), two light prisms are combined, and the light incident surface of the first prism closer to the object, It is described that free curved surfaces are used for all seven surfaces in total, that is, the light incident surface, the two reflective surfaces, and the light exit surface of the second prism closer to the reflective surface, the light exit surface, and the imaging surface.

As a feature of such an optical system,
(1) Although the three reflecting surfaces use free-form curved surfaces having power, these reflecting surfaces can obtain a large power with respect to a refractive optical system such as a lens and are also affected by chromatic aberration. Absent.

(2) It can have seven optical surfaces in a compact space. Accordingly, the optical elements can be condensed and set in a limited space.
(3) Although it is desirable to increase the optical path length of the entire optical system to some extent in order to improve the optical performance, by using such a prism optical system, the optical path is bent, but the entire optical path length is long. The size of can be made compact.
Japanese Patent Laid-Open No. 11-326766 JP 2002-196243 A JP 2003-84200 A

  In the compact imaging apparatus described above, it is difficult to fix small parts with screw members. For this reason, fixing parts with an adhesive agent is examined. However, when small parts are fixed with an adhesive, the adhesive may adhere to the optical function surface of the parts. In addition, since it is difficult to accurately bond parts to predetermined positions, it is often difficult to maintain desired optical characteristics.

  In addition, in the optical device described in Japanese Patent Application Laid-Open No. 5-72466, in the case where the bonding surface is formed through the groove portion next to the bonding surface, the prism is not formed when the thickness of the adhesive varies. The optical characteristics may be adversely affected.

  Accordingly, an object of the present invention is to provide a prism unit capable of fixing a prism to an accurate position of a diaphragm member with an adhesive and an imaging apparatus using the prism unit.

  The prism unit of the present invention based on the first aspect has a prism having an entrance surface, an exit surface, and a free-form reflecting surface, and a stop hole for fixing the prism and restricting a light beam passing through the prism. A prism unit comprising a diaphragm member, an abutting surface formed on the surface of the diaphragm member on the side where the prism is provided and positioned around the aperture hole, and the abutting surface An adhesive surface having an adhesive smaller than the prism and a recess formed between the abutting surface and the adhesive surface so as to surround the abutting surface. .

  The prism unit of the present invention based on the second aspect is disposed between the first and second prisms having an entrance surface, an exit surface, and a free-form reflecting surface, respectively, and the first and second prisms. And a prism unit including a diaphragm member having a diaphragm hole for restricting a light beam passing through the prisms, the prism unit being formed on one surface of the diaphragm member around the diaphragm hole. A first abutting surface for positioning the first abutting surface, a first adhesive surface having a height smaller than that of the first abutting surface, and an adhesive provided between the first prism and the first abutting surface A first recess formed to surround the first abutting surface between the abutting surface and the first adhesive surface, and on the other surface of the aperture member, around the aperture hole Formed to position the second prism. A second abutting surface having a height smaller than that of the second abutting surface and an adhesive provided between the second prism and the second abutting surface; A second recess formed to surround the second abutting surface between the second adhesive surface and the second adhesive surface;

  An imaging apparatus according to a third aspect of the present invention is an imaging apparatus having a casing, a prism unit housed in the casing, and an imaging element disposed on an imaging surface on the exit side of the prism unit. The prism unit is configured in the same manner as the prism unit based on the second aspect.

  According to the present invention, the prism can be fixed with an adhesive at an accurate position of the aperture member without being affected by variations in the thickness of the adhesive supplied to the adhesive surface. Moreover, it can suppress that an adhesive agent adheres to the contact surface of an aperture member, and can make an optical characteristic favorable.

A first embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 shows a digital camera 1 as an example of an imaging device, and FIG. 2 shows its inside. As shown in FIG. 1, a release button 3, a flash 4, a finder optical system 5, an imaging optical system cover glass 6, and the like are provided in a housing 2 of the digital camera 1.

  As shown in FIG. 2, an imaging device 10, an image processing circuit 11, a recording unit 12, and the like are accommodated in the housing 2. The image processing circuit 11 obtains image data by performing predetermined electrical processing on the electrical signal obtained by the imaging device 10. The recording unit 12 records the image data from the image processing circuit 11 on a recording medium. An image monitor 13 is provided on the back surface of the housing 2.

  As shown in FIGS. 3 to 6, the imaging device 10 is disposed on a housing 20, a prism unit 21 constituting a decentered optical system housed in the housing 20, and an image plane of the prism unit 21. The image sensor 22 such as a CCD and a frame member (fixed frame) 24 to which the substrate 23 is fixed are included. The image sensor 22 is mounted at a predetermined position on the substrate 23.

  The cover glass 6 is attached to an opening (incident window) 25 on the incident side of the housing 20. An optical member 26 such as a filter is attached to the opening on the emission side of the housing 20. As shown in FIGS. 4 and 5, a part 20 a of the housing 20 is fitted to the frame member 24, and both are fixed to each other by a black adhesive 27 that has both light shielding properties and a dustproof function. A sealed dust-proof space is formed inside. The material of the housing 20 and the frame member 24 is a synthetic resin such as polycarbonate having good adhesion to the adhesive 27.

  FIG. 6 shows an example of the prism unit 21. The prism unit 21 includes a first prism 31 that functions as an optical element, a second prism 32 that functions as an optical element, and a diaphragm member 33.

  The throttle member 33 includes a throttle part 36 in which a throttle hole 34 and a positioning hole 35 (shown in FIG. 8) are formed, and an attachment part 37 fixed to the ceiling wall 20b (shown in FIG. 4) of the housing 20. Have. The aperture hole 34 is circular and has a function of limiting the light beam passing through the prisms 31 and 32. The throttle portion 36 and the attachment portion 37 are integrally formed of a synthetic resin such as polycarbonate. As will be described later, the first prism 31 is bonded to one surface of the diaphragm member 33, and the second prism 32 is bonded to the other surface of the diaphragm member 33.

  A first abutting surface 40 and a first adhesive surface 41 are formed on one surface of the aperture member 33. The first abutting surface 40 has an annular shape and is formed around the throttle hole 34. When the flat surface portion 55 of the first prism 31 is in contact with the first abutting surface 40, the first prism 31 is positioned with respect to the aperture member 33 in the optical axis direction.

  The first adhesive surface 41 is formed around the first abutting surface 40 and has a height smaller than that of the abutting surface 40. That is, the height of the adhesive surface 41 is lower than the abutting surface 40 in the thickness direction of the narrowed portion 36. An adhesive 42 is provided between the first prism 31 and the adhesive surface 41.

  An example of the adhesive 42 is an acrylic resin, but an adhesive made of a silicon adhesive or a thermoplastic resin (such as styrene) may be used. The adhesive 42 is supplied to the adhesive surface 41 by an adhesive supply device such as a dispenser. The adhesive 42 is a black type in order to obtain light shielding properties.

  The adhesive 42 is supplied to the first adhesive surface 41 in a state where the first adhesive surface 41 is horizontal with the first adhesive surface 41 facing upward. The first prism 31 is fixed to the diaphragm member 33 by the adhesive 42 being cured. Since the height of the adhesive surface 41 is lower than the abutting surface 40 and the position of the prism 31 is regulated by the abutting surface 40, the prism 31 can be used even if the thickness of the adhesive 42 supplied to the adhesive surface 41 varies. The position of is not affected.

  A groove-shaped first recess 43 is formed between the first abutting surface 40 and the first adhesive surface 41 so as to surround the first abutting surface 40. The recess 43 is formed concentrically with the circular throttle hole 34 and is continuous in the circumferential direction of the throttle hole 34. When the adhesive 42 supplied to the adhesive surface 41 is about to flow toward the abutting surface 40, the adhesive 42 flows into the recess 43, thereby preventing excess adhesive 42 from reaching the abutting surface 40. it can.

  Thus, since the surplus portion of the adhesive 42 can be received by the recess 43, the adhesive 42 does not adhere to the abutting surface 40, and the position of the prism 31 can be maintained with high accuracy. Moreover, since the adhesive 42 does not enter the aperture hole 34, the optical surface of the prism 31 can be kept clean.

  A second abutting surface 45 and a second adhesive surface 46 are formed on the other surface of the aperture member 33. The second abutting surface 45 is also annular and is formed around the throttle hole 34. When the flat surface portion 67 of the second prism 32 abuts on the second abutting surface 45, the second prism 32 is positioned with respect to the diaphragm member 33 in the optical axis direction.

  The second bonding surface 46 is formed around the second abutting surface 45 so as to be smaller than the abutting surface 45. That is, the height of the bonding surface 46 is lower than the abutting surface 45 in the thickness direction of the throttle portion 36. An adhesive 47 similar to the adhesive 42 is provided between the second prism 32 and the adhesive surface 46.

  The adhesive 47 is supplied to the second adhesive surface 46 in a state where the second adhesive surface 46 is horizontal. When the adhesive 47 is cured, the second prism 32 is fixed to the diaphragm member 33. Since the height of the adhesive surface 46 is lower than the abutting surface 45 and the position of the prism 32 is regulated by the abutting surface 45, even if the thickness of the adhesive 47 supplied to the adhesive surface 46 varies, the prism 32. The position of is not affected.

  A groove-shaped second recess 48 is formed between the second abutting surface 45 and the second adhesive surface 46 so as to surround the second abutting surface 45. The recess 48 is formed concentrically with the circular throttle hole 34 and is continuous in the circumferential direction of the throttle hole 34. When the adhesive 47 supplied to the adhesive surface 46 is about to flow toward the abutting surface 45, the adhesive 47 flows into the concave portion 48, thereby preventing excess adhesive 47 from reaching the abutting surface 45. it can.

  Thus, since the surplus portion of the adhesive 47 can be received by the recess 48, the adhesive 47 does not adhere to the abutting surface 45, and the position of the prism 32 can be maintained with high accuracy. In addition, since the adhesive 47 does not enter the aperture hole 34, the optical surface of the prism 32 can be kept clean.

  Both the first and second prisms 31 and 32 are formed of a material having excellent optical characteristics, such as a norbornane resin. Norbornene-based resin is a material having excellent optical characteristics. Note that a cycloolefin resin or a polyolefin resin may be used as the material of the prisms 31 and 32.

  As shown in FIG. 4, the first prism 31 is an eccentric prism having an incident surface 50, a free-form reflecting surface 51 having a rotationally asymmetric and symmetric surface, an exit surface 52, and a pair of side surfaces 53. is there. A coating layer 54 is formed on the reflective surface 51 by, for example, aluminum vapor deposition.

  As shown in FIG. 8, a flat portion 55 is formed around the exit surface 52 of the first prism 31. A positioning portion 56 made of a convex portion is formed on the flat surface portion 55. By inserting the positioning portion 56 into the positioning hole 35 of the aperture member 33, the aperture member 33 is positioned in the direction along the abutment surface 40 of the first prism 31 (surface direction). Convex portions 57 are formed on both side surfaces 53 of the first prism 31.

  The second prism 32 is an eccentric prism having an incident surface 60, two reflecting surfaces 61 and 62, an exit surface 63, and a pair of side surfaces 64. At least one of the two reflecting surfaces 61 and 62 is rotationally asymmetric and has a free-form surface shape having one symmetric surface. On these reflection surfaces 61 and 62, coating layers 65 and 66 are formed by, for example, aluminum vapor deposition.

  As shown in FIG. 4, the light beam that has entered the first prism 31 from the incident-side opening 25 along the incident optical axis λ <b> 1 is reflected by the reflecting surface 51 of the first prism 31 and is incident from the exit surface 52. The light enters the second prism 32 through the surface 60. Then, the light is reflected by the reflection surfaces 61 and 62, and is imaged by the image pickup element 22 from the emission surface 63 through the optical member 26 along the emission optical axis λ 2. The incident optical axis λ1 and the outgoing optical axis λ2 are substantially parallel.

  As shown in FIG. 8, a flat portion 67 is formed around the incident surface 60 of the second prism 32. A positioning part 68 made of a convex part is formed on the flat part 67. By inserting the positioning portion 68 into the positioning hole 35, positioning in the direction (plane direction) along the abutting surface 45 of the second prism 32 with respect to the diaphragm member 33 is performed. Convex portions 69 are formed on both side surfaces 64 of the second prism 32.

  In the present embodiment, the positioning hole 35 formed in the diaphragm member 33 is a through hole, and black coating is applied to the positioning portions 56 and 68 in order to prevent light leakage. As another means for providing the same effect, the positioning hole 35 may not be a through hole, and a bottomed hole may be formed from both surfaces of the throttle portion 36.

  As described above, the first prism 31 is positioned in the optical axis direction by contacting the first abutting surface 40 of the diaphragm member 33, and the convex positioning portion 56 is formed in the positioning hole 35. By inserting, the abutment surface 40 is positioned in the surface direction. In this state, it is fixed to the diaphragm member 33 by the adhesive 42.

  The second prism 32 is positioned in the optical axis direction by coming into contact with the second abutting surface 45 of the diaphragm member 33, and the convex positioning portion 68 is inserted into the positioning hole 35 to thereby apply the contact. Positioning of the attachment surface 45 in the surface direction is performed. In this state, it is fixed to the diaphragm member 33 by the adhesive 47.

  In this way, the first prism 31 and the second prism 32 can be accurately fixed at a predetermined position of the diaphragm member 33, so that the relative positions of the prisms 31 and 32 can be accurately regulated. For this reason, the prism unit 21 can obtain good optical characteristics.

  In the above-described embodiment, the positioning portions 56 and 68 are inserted into the positioning holes 35 to position the prisms 31 and 32 with respect to the diaphragm member 33 in the surface direction (the direction along the abutting surfaces 40 and 45). However, it is not limited to such positioning means. For example, the adhesives 42 and 47 may be cured in a state where the prisms 31 and 32 are positioned in the surface direction with respect to the diaphragm member 33 by a jig that holds the prisms 31 and 32.

The adhesives 42 and 47 are smaller than the thermal expansion coefficient of the diaphragm member 33. For example, when the material of the aperture member 33 is polycarbonate (thermal expansion coefficient: 6 to 7 × 10 ⁻⁵ ), an acrylic adhesive (thermal expansion coefficient: 5.7 × 10 ⁻⁵ ) or a siloxane polyimide adhesive ( The coefficient of thermal expansion is preferably 1 × 10 ⁻⁶ ). By doing so, for example, even if the adhesives 42 and 47 expand at a high temperature, it is possible to avoid an increase in the distance between the prisms 31 and 32 and the abutting surfaces 40 and 45.

  A convex portion (boss portion) 70 is formed on the attachment portion 37 of the aperture member 33. A hole 72 is formed in the ceiling wall 20 b of the housing 20. The convex portion 70 is inserted into the hole 72, and the attachment portion 37 of the throttle member 33 is fixed to the ceiling wall 20b of the housing 20 by fixing means such as an adhesive.

  As shown in FIG. 5, openings 90 are formed in both side walls 20 c of the housing 20. These openings 90 are formed at positions corresponding to the convex portions 57 and 69 of the first and second prisms 31 and 32. Both side surfaces 53 of the prism 31 and both side walls 20 c of the housing 20 are fixed by an adhesive 91.

  Since the adhesive 91 is cured over the opening 90 of the housing 20 and the convex portion 57 of the prism 31, even if the prisms 31 and 32 are made of a hardly adhesive resin such as a norbornene resin, FIG. A large peel strength can be exhibited with respect to the force in the arrow Y direction. Similarly to the first prism 31, the second prism 32 is also fixed to the inner surface of the housing 20 by a convex portion 69 and an adhesive 91 supplied in the vicinity thereof.

  9 and 10 show a second embodiment of the present invention. On one surface of the diaphragm member 33 of this embodiment, a first abutting surface 40 a made of a hemispherical convex portion is formed around the diaphragm hole 34. These abutting surfaces 40 a are formed at three locations in the circumferential direction of the aperture hole 34, and support the flat portion 55 of the first prism 31 at three points, whereby the optical axis direction of the first prism 31 with respect to the aperture member 33. Is positioned with high accuracy.

  Around the abutting surface 40a, an adhesive surface 41 and an annular recess 43 similar to those of the first embodiment are formed. Positioning holes 35 a and 35 b are formed at two locations inside the recess 43. One positioning hole 35a is circular. The other positioning hole 35 b has a slightly longer shape in the radial direction of the throttle hole 34. By fitting a pair of positioning portions (not shown) formed on the first prism 31 into the corresponding positioning holes 35a and 35b, the contact surface of the first prism 31 with respect to the aperture member 33 is obtained. Positioning along the direction 41 is performed.

  As shown in FIG. 10, a second abutting surface 45 a made of a hemispherical convex portion is formed on the other surface of the aperture member 33. These abutting surfaces 45a are formed at three locations in the circumferential direction of the aperture hole 34, and support the flat portion 55 of the second prism 32 at three points, whereby the optical axis direction of the second prism 32 relative to the aperture member 33 is achieved. Is positioned with high accuracy.

  Around the abutting surface 45a, an adhesive surface 46 and an annular recess 48 similar to those of the first embodiment are formed. By fitting a pair of positioning portions (not shown) formed on the second prism 32 into the positioning holes 35a and 35b, along the abutment surface 46 of the second prism 32 with respect to the diaphragm member 33. Directional positioning is made.

  FIG. 11 shows a third embodiment of the present invention. In this embodiment, convex portions 100 are formed at three locations around the exit surface 52 of the first prism 31. These convex portions 100 abut against one abutment surface 40 of the diaphragm member 33 at three points so that the first prism 31 is positioned with respect to the diaphragm member 33. Further, convex portions 101 are formed at three locations around the incident surface 60 of the second prism 32. These convex portions 101 are in contact with the other abutting surface 45 of the diaphragm member 33 at three points so as to position the second prism 32 with respect to the diaphragm member 33. Since the other configuration is common to the first and second embodiments, the description thereof is omitted.

  12 and 13 show a fourth embodiment of the present invention. In this embodiment, a groove 110 extending from the vicinity of the first abutting surface 40 toward the peripheral edge of the diaphragm member 33 is formed on the first adhesive surface 41 of the diaphragm member 33. Further, a groove 111 extending from the vicinity of the second abutting surface 45 toward the peripheral edge of the diaphragm member 33 is formed on the second adhesive surface 46.

  By forming such grooves 110 and 111, it is easy to flow out the excess adhesive supplied to the bonding surfaces 41 and 46 toward the peripheral edge of the throttle member 33 along the grooves 110 and 111. Become. For this reason, it can prevent more effectively that the excess adhesive agent of the adhesive surfaces 41 and 46 adheres to the abutting surfaces 40 and 45. FIG. Since the other configuration is common to the first and second embodiments, the description thereof is omitted.

  FIG. 14 shows a fifth embodiment of the present invention. In this embodiment, the width of the groove 110 a formed in the first adhesive surface 41 is widened toward the peripheral edge of the diaphragm member 33. Although not shown, a similar groove is formed in the second adhesive surface 46. With such a tapered groove 110a, the flow resistance of the adhesive decreases toward the peripheral edge of the squeezing member 33, so that the excess adhesive can easily flow out to the peripheral edge. Since the other configuration is the same as that of the fourth embodiment, description thereof is omitted. Instead of using the positioning holes 35a and 35b, the prisms 31 and 32 may be positioned in the surface direction with respect to the diaphragm member 33 by using a jig used for curing the adhesive.

  FIG. 15 shows a sixth embodiment of the present invention. The groove 110 ′ formed in the first adhesive surface 41 of this embodiment is inclined so that the distance from the first prism 31 increases toward the peripheral edge of the diaphragm member 33. The groove 111 ′ formed in the second bonding surface 46 is also inclined so that the distance from the second prism 32 increases toward the peripheral edge of the diaphragm member 33. According to the inclined grooves 110 ′ and 111 ′ in this way, the flow resistance of the adhesive decreases toward the peripheral edge of the squeezing member 33, so that excess adhesive can easily flow out to the peripheral edge of the squeezing member 33. Since the other configuration is the same as that of the fourth embodiment, description thereof is omitted.

  16 and 17 show a seventh embodiment of the present invention. The first adhesive surface 41 of this embodiment is inclined so that the distance from the first prism 31 increases toward the peripheral edge of the diaphragm member 33. The second adhesive surface 46 is inclined so that the distance from the second prism 32 increases toward the peripheral edge of the diaphragm member 33. By adopting the inclined bonding surfaces 41 and 46 in this way, it is possible to flow the excess adhesive supplied to the bonding surfaces 41 and 46 toward the peripheral edge of the throttle member 33. The positioning holes 35a and 35b may be formed in the abutting surfaces 40 and 45.

  18 and 19 show an eighth embodiment of the present invention. In this embodiment, a wall 120 is formed on the peripheral edge of one surface of the diaphragm member 33. The distance between the wall 120 and the first prism 31 is smaller than the distance from the first adhesive surface 41 to the first prism 31. A gap S <b> 1 is formed between the wall 120 and the first prism 31.

  A wall 121 is also formed at the peripheral edge of the other surface of the aperture member 33. The distance between the wall 121 and the second prism 32 is smaller than the distance from the second adhesive surface 46 to the second prism 32. A gap S <b> 2 is formed between the wall 121 and the second prism 32. According to such a configuration, the adhesive supplied to the bonding surfaces 41 and 46 can be blocked to some extent by the walls 120 and 121. For this reason, the adhesive is easily applied to the entire bonding surfaces 41 and 46. Excess adhesive supplied to the bonding surface 41 flows out from the gaps S1 and S2.

  FIG. 20 shows a ninth embodiment of the present invention. In this embodiment, the wall 120 is formed only on a part of the peripheral edge of the aperture member 33. That is, an opening 123 is formed between the wall portions 120. A similar wall portion (not shown) is also formed on the other surface of the diaphragm member 33. According to such a configuration, the adhesive supplied to the adhesive surface 41 can be blocked to some extent by the wall portion 120, so that the adhesive can be easily applied to the entire adhesive surface 41. Excess adhesive supplied to the bonding surface 41 flows out of the bonding surface 41 from the opening 123.

  FIG. 21 shows an example in which the imaging apparatus of the present invention is incorporated in a camera-equipped mobile phone 130 as an example of imaging equipment. By incorporating the imaging device including the prism unit 21 described in each of the embodiments into the camera-equipped mobile phone 130, the camera-equipped mobile phone 130 can be further reduced in size and thickness and optical performance can be improved.

  In carrying out the present invention, it goes without saying that the constituent elements of the invention including the housing, prism, abutting surface, adhesive surface and adhesive can be variously modified without departing from the gist of the present invention. Yes.

1 is a perspective view of a digital camera including an imaging device according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view schematically showing the inside of the digital camera shown in FIG. 1. 1 is a perspective view of an imaging apparatus showing a first embodiment of the present invention. Sectional drawing of the imaging device which follows F4-F4 line | wire in FIG. Sectional drawing of the imaging device which follows F5-F5 line | wire in FIG. Sectional drawing of the prism unit of the imaging device shown by FIG. Sectional drawing which expands and shows a part of prism unit shown by FIG. FIG. 7 is an exploded perspective view of the prism unit shown in FIG. 6. The perspective view of the aperture member which concerns on the 2nd Embodiment of this invention. FIG. 10 is a cross-sectional view of a part of a prism unit including the diaphragm member shown in FIG. 9. Sectional drawing of a part of prism unit which concerns on the 3rd Embodiment of this invention. The front view of the aperture member which concerns on the 4th Embodiment of this invention. Sectional drawing of the aperture_diaphragm | squeeze member which follows the F13-F13 line | wire in FIG. The front view of the aperture member which concerns on the 5th Embodiment of this invention. Sectional drawing of the aperture member which concerns on the 6th Embodiment of this invention. The front view of the aperture member which concerns on the 7th Embodiment of this invention. FIG. 17 is a cross-sectional view of the diaphragm member taken along line F17-F17 in FIG. The front view of the aperture member which concerns on the 8th Embodiment of this invention. FIG. 19 is a cross-sectional view of the diaphragm member taken along line F19-F19 in FIG. The front view of the aperture member which concerns on the 9th Embodiment of this invention. The perspective view which shows an example of the mobile phone with a camera.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Imaging device 20 ... Housing 21 ... Prism unit 31 ... First prism 32 ... Second prism 33 ... Diaphragm member 34 ... Diaphragm hole 40 ... First abutting surface 41 ... First adhesive surface 42 ... Adhesion Agent 43 ... first recess 45 ... second abutting surface 46 ... second adhesive surface 47 ... adhesive 48 ... second recess 56 ... positioning portion 68 ... positioning portion

Claims (8)

A prism having an entrance surface, an exit surface and a free-form reflecting surface;
A diaphragm member having a diaphragm hole for fixing the prism and restricting a light beam passing through the prism;
A prism unit comprising:
On the surface of the diaphragm member on the side where the prism is provided,
An abutting surface that is formed around the aperture hole to position the prism;
An adhesive surface that is smaller in height than the abutment surface and that provides an adhesive between the prism, and
A recess formed between the abutting surface and the adhesive surface;
A prism unit comprising: First and second prisms each having an entrance surface, an exit surface, and a free-form reflecting surface;
A diaphragm member disposed between the first and second prisms and having a diaphragm hole for limiting a light beam passing through the prisms;
A prism unit comprising:
On one surface of the diaphragm member,
A first abutting surface that is formed around the aperture hole and that positions the first prism;
A first adhesive surface that is smaller in height than the first abutting surface and that provides an adhesive with the first prism;
A first recess formed between the first abutment surface and the first adhesive surface;
On the other surface of the diaphragm member,
A second abutment surface formed around the aperture hole to position the second prism;
A second adhesive surface that is smaller in height than the second abutting surface and provides an adhesive between the second prism;
A second recess formed between the second abutment surface and the second adhesive surface;
A prism unit comprising: A housing,
A prism unit housed in the housing;
An image sensor disposed on the imaging surface on the exit side of the prism unit;
An imaging device having
The prism unit is
First and second prisms each having an entrance surface, an exit surface, and a free-form reflecting surface;
A diaphragm member disposed between the first and second prisms and having a diaphragm hole for limiting a light beam passing through the prisms;
Comprising
On one surface of the diaphragm member,
A first abutting surface that is formed around the aperture hole and that positions the first prism;
A first adhesive surface that is smaller in height than the first abutting surface and that provides an adhesive with the first prism;
A first recess formed between the first abutment surface and the first adhesive surface;
On the other surface of the diaphragm member,
A second abutment surface formed around the aperture hole to position the second prism;
A second adhesive surface that is smaller in height than the second abutting surface and provides an adhesive between the second prism;
A second recess formed between the second abutment surface and the second adhesive surface;
An imaging device comprising:   A first positioning portion for positioning the first prism in a direction along the first abutting surface is provided on one surface of the aperture member, and the second surface is provided on the other surface of the aperture member. The imaging apparatus according to claim 3, wherein a second positioning portion that positions the prism in a direction along the second abutting surface is provided.   A groove extending from the vicinity of the first abutting surface to the periphery of the diaphragm member is formed in the first adhesive surface, and the second adhesive surface from the vicinity of the second abutting surface is formed. The imaging device according to claim 3, wherein a groove extending toward the peripheral edge of the diaphragm member is formed.   The first adhesive surface is inclined so that the distance from the first prism increases from the vicinity of the first abutting surface toward the periphery of the aperture member, and the second adhesive surface is 5. The device according to claim 3, wherein the second prism is inclined so that a distance from the second prism increases from a vicinity of the second abutting surface toward a peripheral portion of the diaphragm member. Imaging device.   A wall portion having a smaller distance to the first prism than the first adhesive surface is formed at a peripheral portion of one surface of the diaphragm member, and the The imaging apparatus according to claim 3, wherein a wall portion having a distance to the prism of 2 smaller than the second adhesive surface is formed.   The thermal expansion coefficient of the adhesive supplied to the first adhesive surface and the second adhesive surface is smaller than the thermal expansion coefficient of the diaphragm member, according to any one of claims 3 to 7. The imaging device described.

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