JP5086927B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging apparatus having an imaging element. More specifically, the present invention relates to a technique for assembling an optical system in an imaging apparatus including an imaging element.

  In a so-called digital camera, various optical elements such as a lens and an image sensor (for example, a CCD) are arranged. In order to form an accurate subject image on the image sensor, various improvements have been made on the shape and arrangement of the members supporting each optical element, in addition to the improvement of the performance of each optical element itself.

  For example, in Patent Document 1, when an optical system is assembled, a packing is provided between an image sensor and an optical element adjacent to the image sensor to prevent dust from entering the image sensor. Various shapes of the packing have been studied, and Patent Document 1 discloses the configuration shown in FIG. 5 and the configuration shown in FIG.

Further, after the optical system is assembled, it is inspected whether or not the optical axis of the optical system and the image sensor are perpendicular. If it is not vertical, the imaging state of the subject image will be non-uniform on the CCD, and the subject image will be blurred. If the result of the inspection is not vertical, it is disassembled, reassembled and reinspected. However, this is very inefficient. Therefore, for example, in Patent Document 2, when the CCD and the CCD fixing member are fixed using three adjustment screws, the mounting angle of the CCD can be adjusted by adjusting the screwing amount of each screw.
JP-A-4-314273 (FIG. 5, FIG. 1, etc.) JP 2004-287304 A

  Although the structure of the packing described in FIG. 5 of Patent Document 1 is simple, Patent Document 1 points out the occurrence of a gap due to deformation in the assembly process. Further, the structure of the packing described in FIG. 1 of Patent Document 1 is complicated and expensive.

  In addition, the technique for adjusting the mounting angle of the CCD using three adjusting screws described in Patent Document 2 is intuitively how the mounting angle of the CCD changes according to the screwing amount of each adjusting screw. It was difficult to understand, trial and error was required, and it was difficult to accurately adjust the mounting angle of the CCD.

  An object of the present invention is to provide a technique applicable in an assembly process of an optical system that is useful for forming an accurate subject image on an image sensor. A specific first object of the present invention is to provide a member that reliably prevents dust from entering between optical members such as an image sensor with a simple configuration. A second object of the present invention is to provide a structure for making it possible to adjust the angle with respect to the optical axis of the image pickup element with high accuracy independently with respect to two orthogonal directions, with a simple configuration. .

  An imaging apparatus according to the present invention includes a first optical member and a second optical member provided on an optical axis, one of which is an imaging element, the first optical member, the first optical member, and the first optical member. An elastic member disposed so as to surround a space between the optical member and the second optical member, the elastic member having an inclined surface inclined with respect to the optical axis, and the first optical At least one of the member and the second optical member contacts the elastic member on the inclined surface, thereby sealing the space.

  At least one of the first optical member and the second optical member may be in contact with the elastic member in the middle of the inclined surface to seal the space.

  The first optical member is an image sensor, the second optical member is an optical filter, and the elastic member is an orthogonal surface that is orthogonal to the optical axis and is in contact with the second optical member. Further, the first optical member may be in contact with the elastic member on the inclined surface to elastically deform the elastic member, thereby sealing the space.

  The elastic member includes a first inclined surface and a second inclined surface that are inclined with respect to the optical axis, the first inclined surface is in contact with the first optical member, and the second inclined surface is You may contact | abut with a 2nd optical member.

  One of the first optical member and the second optical member may be an image sensor, and the other may be an optical filter.

  According to the present invention, the first part and the second part of a plate-like body such as a sheet metal are connected by the bridge portion, and a plurality of holes passing through the fixing hole of the first part and the adjustment hole of the second part, respectively. The plate-like body is configured to be held by the holding member using the fixing member. Since the first part and the second part are not integrated and are connected by the bridge part, the first part is fixed using the fixing hole, and the bridge part is elastically deformed to fix the second part. It is possible to adjust the inclination with respect to the optical axis. In particular, since the first portion is fixed to the holding member, it is possible to stably adjust the inclination of the second portion.

  In addition, an elastic member is disposed so as to surround a space between the plurality of optical members, and at least one optical member abuts the elastic member on an inclined surface of the elastic member inclined with respect to the optical axis. Since the optical member and the elastic member are not brought into contact with each other at the uppermost end portion of the inclined surface, the above-described space can be reliably sealed with a simple configuration, thereby preventing dust from entering.

  Hereinafter, an embodiment of an imaging apparatus according to the present invention will be described with reference to the accompanying drawings. In the following, it is assumed that the imaging device is a digital camera.

  1A to 1C show the appearance of the digital camera 100 according to the present embodiment. (A) is a front view, (b) is a rear view, and (c) is a top view.

  The digital camera 100 has a lens barrel 1. When light from a subject to be photographed enters the lens barrel 1, it forms an image on an image sensor (CCD in the present embodiment) described later via an optical system in the digital camera 100. The image sensor outputs an electrical signal having a magnitude corresponding to the intensity of the received light. Thereafter, the electrical signal is digitized to generate video data. An image based on the video data is displayed on the liquid crystal display 10 shown in FIG. When the shutter button 12 shown in FIG. 1C is pressed, the image data at that time is written to a memory card (not shown).

  As will be described in detail later, in the digital camera 100 according to the present embodiment, the CCD is adjusted to be perpendicular to the optical axis of the optical system of the digital camera 100. Since the image formation state on the CCD is uniform, no blurring of the image occurs.

  In addition, a cushion (a rubber cushion in this embodiment), which is an elastic member, is disposed between the CCD and the optical filter disposed adjacent to the CCD, and seals the space between the CCD and the optical filter. It has stopped. The cushion has a structure that is easy to manufacture, and can very easily and reliably seal the space between the CCD and the optical filter.

  Next, the configuration of the optical system in the digital camera 100 will be described. In this specification, the “optical system” includes a lens, a prism, an optical filter, and a CCD. The elements and components that make up the optical system are called optical elements.

  FIG. 2 is a cross-sectional view of the lens barrel 1 by a plane including the optical axis 3. Light from the subject enters the lens barrel 1 from the upper side in FIG. FIG. 2 also shows a CCD unit 2 disposed behind the digital camera 100 rather than the lens barrel 1.

  FIG. 3 is a detailed sectional view of the CCD unit 2. A CCD 44, a cushion 45, and an optical filter 46 are disposed perpendicular to the optical axis 3.

  Light from the subject enters the CCD unit 2 from the lens barrel 1 along the direction indicated by the optical axis 3 in the drawing. The incident light from the subject first passes through the optical filter 46. The optical filter 46 is, for example, an infrared cut filter or an ultraviolet cut filter. Thereafter, the light passes through the space 30 existing between the optical filter 46 and the CCD 44 and enters the CCD 44. The CCD 44 outputs an electrical signal corresponding to the incident light. The electric signal is output via a flexible printed circuit board (described later) connected to the CCD 44.

  The cushion 45 and the optical filter 46 are pasted with an adhesive. The CCD 44 and the cushion 45 are in contact with each other with no gap. More specifically, the latter is pressed against the cushion 45, and the cushion 45 is elastically deformed. This means that the force pressed from the CCD 44 is balanced with the restoring force of the cushion 45 at the contact position between the two. Further, the CCD 44 is pressed against the cushion 45 in the middle of the inclined surface of the cushion 45 inclined with respect to the optical axis. In this state, there is no gap between the CCD 44 and the cushion 45. The space 30 is completely sealed by the CCD 44, the cushion 45, and the optical filter 46, and dust from the outside does not enter the space 30.

  FIG. 4 shows an assembly diagram of the CCD unit 2. The CCD unit 2 includes a sheet metal 42, a flexible printed circuit board 43, a CCD 44, a cushion 45, an optical filter 46, springs 47b and 47c, and a master flange 48, which are stacked and assembled in this order. It is done. The components from the sheet metal 42 to the springs 47b and 47c are fixed and held to the master flange 48 using three screws 41a to 41c. The master flange 48 functions as a holding member that holds many parts described above.

  Hereinafter, each component will be described. However, since the CCD 44, the cushion 45, and the optical filter 46 have been described with reference to FIG.

  The sheet metal 42 is a metal plate-like body to which the flexible printed circuit board 43 and the CCD 44 are attached. Details of the sheet metal 42 will be described later with reference to FIG.

  The flexible printed circuit board 43 is electrically connected to the CCD 44 and has wiring and a circuit for transmitting an electric signal output from the CCD 44 to the inside of the digital camera 100.

  The springs 47b and 47c are, for example, coil springs, and the screws 41b and 41c pass therethrough. The springs 47b and 47c exert an elastic force in a direction opposite to the direction in which the screws 41b and 41c are tightened (the direction toward the master flange 48), thereby causing the sheet metal 42 sandwiched between them to the optical filter 46. Prevents rattling of the elements.

  Next, the sheet metal 42 will be described in detail with reference to FIG.

  FIG. 5 is an enlarged view of the sheet metal 42. Screws 41a to 41c shown in FIG. 4 are tightened in the direction from the front side to the back side of FIG.

  The sheet metal 42 according to this embodiment is roughly composed of four parts. Specifically, the sheet metal 42 includes a first portion 50a, a second portion 50b, and two bridge portions 50c and 50d.

  A fixing screw hole 42a is formed in the first portion 50a. The fixing screw hole 42a is a hole through which the screw 41a passes.

  Adjustment screw holes 42b and 42c are formed in the second portion 50b. The adjusting screw holes 42b and 42c are holes through which the screws 41b and 41c pass, respectively. The second portion 50 b includes a step portion 51 for attaching the CCD 44 and the flexible printed circuit board 43.

  The bridge portions 50c and 50d connect the first portion 50a and the second portion 50b and have a relatively narrow width.

  The sheet metal 42 to which the CCD 44 is attached has a structure that can be adjusted so that the CCD 44 is perpendicular to the optical axis after the CCD unit 2 is assembled. One of the main structures provided for this purpose is the bridge portions 50c and 50d. Hereinafter, the structure and the adjusting method will be described in detail.

  In the following, the process of adjusting the CCD 44 and the optical axis vertically is also described. This process may be performed during the assembly of the CCD unit 2 or may be performed after the assembly process is completed.

  The bridge portion 50c is provided so as to extend in a direction (X-axis direction in FIG. 5) substantially parallel to a straight line connecting the fixing screw hole 42a and the adjusting screw hole 42b. The bridge portion 50d is provided so as to extend in a direction (Y-axis direction in FIG. 5) substantially parallel to a straight line connecting the fixing screw hole 42a and the adjustment screw hole 42c.

  The screws 41a and 41c are provided with a stepped portion q2 below the flange portion (screw head portion) q1. The fixing screw hole 42a is a round hole, and its diameter is set so as to substantially match the diameter of the stepped portion q2 of the screw 41a. The screw hole 42c is a long hole, and its long side P is set longer than the diameter of the stepped portion q2 of the screw 41c, and its short side Q is set so as to substantially match the diameter of the screw 42a. Yes.

  By inserting the screw 41a into the fixing screw hole 42a and inserting and tightening the screw 41c into the screw hole 42c, the sheet metal 42 is connected to the master flange by the screw 41a and the screw 41c. 48 is accurately positioned.

  The screw 41a is completely fastened to the fixing screw hole 42a. Subsequently, the screw 41b is fastened to the screw hole 42b. The diameter R of the screw hole 42b is larger than the diameter of the screw 41b. The reason is to provide a margin in view of the fact that the position of a screw hole (not shown) provided in the master flange 48 may be slightly shifted due to a manufacturing error. The screw holes 42a and 42c have already been fastened with the screws 41a and 41c, but the screw 41b can be reliably inserted into the screw hole 42b by making the diameter R of the screw hole 42b larger than the diameter of the screw 41b. The screw hole 42b is also referred to as a “fool hole”.

  Unlike the screw 41a, the screws 41b and 41c are not completely fastened to the screw holes 42b and 42c. This is because the angle of the second portion 50b with respect to the master flange 48 is adjusted according to the respective tightening heights.

  The order of tightening the screws 41a, 41b, and 41c described above is an example and may be reversed.

  In the present embodiment, the X-axis direction and the Y-axis direction in FIG. 5 are parallel to the respective sides of the rectangular CCD 44.

  The bridge portion 50d is elastically deformed, and the magnitude of the deformation is determined according to the height at which the screw 41c is fastened to the screw hole 42c. If the screw 41c is deeply tightened, the bridge portion 50d is greatly deformed in the direction from the front to the back of the paper, and if it is shallowly tightened, the degree of deformation is small. The angle of the second portion 50b with respect to the master flange 48 changes in proportion to the tightening height of the screw 41c due to the elastic deformation of the bridge portion 50d with respect to the direction along the Y axis. Thus, only the angle in the Y-axis direction of the CCD 44 attached to the second portion 50b can be adjusted without changing the angle in the X-axis direction.

  The bridge portion 50c is elastically deformed, and the magnitude of the deformation is determined according to the height at which the screw 41b is fastened to the screw hole 42b. If the screw 41b is tightened deeply, the bridge portion 50c is greatly deformed in the direction from the front to the back of the paper, and if it is tightened shallowly, the degree of deformation is small. The angle of the second portion 50b with respect to the master flange 48 changes in proportion to the tightening height of the screw 41b due to the elastic deformation of the bridge portion 50c in the direction along the X axis. Thus, only the angle in the X-axis direction of the CCD 44 attached to the second portion 50b can be adjusted independently without changing the angle in the Y-axis direction.

  As described above, the bridge portions 50c and 50d are designed to be elastically deformed according to the tightening height of the screws 41b and 41c. Therefore, it is preferable that the bridge portions 50c and 50d have a configuration that easily causes elastic deformation. For example, when the widths of the bridge portions 50c and 50d are made narrower and longer, the spring coefficients (elastic coefficients) of the bridge portions 50c and 50d can be reduced. Alternatively, the spring coefficient can be adjusted by the material of the bridge portions 50c and 50d.

  In the present embodiment, the second portion 50b does not elastically deform regardless of the tightening degree of the screws 41b and 41c. This is because if the second portion 50b to which the CCD 44 is attached is deformed, the positional relationship between the angle of the CCD 44 and the optical axis varies due to factors other than the height adjustment by tightening the screws 41b and 41c.

  As described above, the angle of the second portion 50b with respect to the master flange 48 can be adjusted in the direction from the front side to the back side of FIG. 5 according to the tightening height of the screws 41b and 41c.

  In the adjustment of the CCD unit 2, the springs 47 b and 47 c shown in FIG. 4 are provided in this embodiment in order to ensure that the peripheral portions of the sheet metal 42 screw holes 42 b and 42 c are brought into contact with the flanges of the screws 41 b and 41 c. Provided.

  FIG. 6 is a cross-sectional view of the sheet metal 42 at the tightening portion when the screws 41b and 41c are tightened. The springs 47b and 47c give an elastic force in the direction opposite to the tightening direction of the screws 41b and 41c. This makes it possible to change the angle of the second portion 50b in the direction from the back of the page of FIG. 5 to the front, and when adjusting the height of the screws 41b and 41c, the bridge portions 50c and 50d are changed beyond the elastic range. Even at this time, the flanges of the screws 41b and 41c can be reliably brought into contact with the peripheral portions of the sheet metal 42 screw holes 42b and 42c by the springs 47b and 47c.

  In the present embodiment, the axes of the springs 47b and 47c are aligned with the axes of the screws 41b and 41c. The action point S1 when the screws 41b and 41c fasten the sheet metal 42 and the action point S2 where the springs 47b and 47c act on the sheet metal 42 are brought close to each other. When the sheet metal 42 is viewed from the direction shown in FIG. 5, the operating point of the screw and the operating point of the spring are substantially the same positions in the vicinity of the screw holes 42b and 42c. If the operating point of the screw is separated from the operating point of the spring, the second portion 50b is easily deformed. Therefore, in order to reduce unnecessary load on the second portion 50b, the operating point of the screw and the operating point of the spring are set at substantially the same position.

  According to the configuration of the present embodiment described above, depending on whether the angle of the second portion 50b with respect to the master flange 48 is to be adjusted with respect to the direction along the X axis or with respect to the direction along the Y axis. Any one of 41b and 41c may be tightened or loosened. Trial and error becomes unnecessary, and the work time for adjustment can be greatly shortened.

  The master flange 48 is designed to be orthogonal to the optical axis and is attached to the digital camera 100 main body. The angle of the second portion 50b to which the CCD 44 is attached can be adjusted independently by screws with respect to the direction along the X axis or the Y axis by the mechanism of the present application. On the other hand, it can be adjusted accurately so as to be vertical.

  Further, it is possible to obtain an advantage that the tilt adjustment can be performed independently and stably in both directions of the X axis and the Y axis only by completely tightening only the screw 41a. The construction of the sheet metal is also very simple.

  Since the screw 41a is completely tightened, even when an external force such as vibration or drop is applied, the inclination of the second portion 50b hardly changes. In particular, by arranging a spring directly below the flange portion of the screws 41b and 41c, the inclination of the second portion 50b can be maintained more stably. In addition, since the position of the bridge portion and the spring can be adjusted while applying forces in opposite directions, a fine angle adjustment is possible, and the accuracy of the position can be increased.

  In the screws 41a and 41c, the sheet metal 42 is positioned in the plane direction (XY plane direction) by the outer diameter of the stepped portion q2 provided below the flange portion (screw head portion) q1. Even when the inclination of the CCD is adjusted by the screws 41b and 41c, the sheet metal 42 is always positioned in the plane direction (XY plane direction) by the outer diameter of the stepped portion q2 of the screws 41a and 41c.

  The screws 41a, 41b, and 41c are usually made of a material such as metal or high-hardness ceramic. Therefore, even when the CCD is tilted or when an external force such as vibration or drop is applied, even if the end surface of the screw hole 42c provided in the sheet metal 42 and the stepped portion q2 of the screw 41c are rubbed, the resin and metal As in the case of rubbing, there is no occurrence of shaving or squeaking (stick-slip), and a change in tilt is unlikely to occur. In addition, there is an advantage that there is little change in inclination due to environmental changes and changes with time. Temporarily, if the structure which provides a hole in a sheet metal and performs positioning in the plane direction of a sheet metal by the protrusion provided in the master flange, the advantage of this invention will be emphasized more. That is, since the master flange is generally composed of a resin part, the protrusion of the resin part and the hole of the sheet metal are engaged. Then, at the time of tilt adjustment, the resin projection is scraped, or the resin projection and the end face of the hole portion of the sheet metal do not slide smoothly, so that it is impossible to adjust the tilt with high accuracy. Therefore, the advantage by the structure of this invention is very useful.

  Next, an assembly process of the CCD 44, the cushion 45, and the optical filter 46 will be described.

  FIG. 7 is a perspective view of the cushion 45. As is clear from FIG. 7, the cushion 45 is configured such that one opening is larger than the other opening.

  FIG. 8 is a cross-sectional view of the cushion 45 cut along the assembly direction. The cushion 45 has an inclined surface 80 that is inclined with respect to the optical axis 3. Due to the presence of the inclined surface 80, the opening 82 is configured to be larger than the other opening 83. The frame 81 that forms the periphery of the opening 83 of the cushion 45 is perpendicular to the optical axis 3 in this example.

  Next, changes in the shape of the cushion 45 before and after the CCD 44 is assembled to the cushion 45 will be described with reference to FIGS. 9 and 10.

  FIG. 9 shows a state immediately before the CCD 44 is assembled to the cushion 45. FIG. 10 shows a state immediately after the CCD 44 is assembled to the cushion 45.

  As shown in FIGS. 9 and 10, the CCD 44 abuts the cushion 45 on the middle 91 of the inclined surface 80 of the cushion 45 and presses the cushion 45 in the direction along the optical axis 3. Thereby, the cushion 45 bends. At this time, the force pressed from the CCD 44 and the restoring force of the cushion 45 are applied to the contact position between them. There is no gap between the CCD 44 and the cushion 45 at the contact position.

  Note that a step (notch portion) is provided at a corner portion of the CCD 44 on the cushion 45 side so as to contact the cushion 45 on the middle surface 91 of the inclined surface 80. By providing the step, the CCD 44 can be brought into contact with the middle 91 below the inclined surface 80. However, it is not essential to provide a notch.

  On the other hand, the frame 81 is bonded to the adjacent optical filter 46 at the position 92. Further, movement and deformation of the outer edge of the cushion 45 are restricted by the master flange 48. Thereby, the space 30 is completely sealed by the CCD 44, the cushion 45 and the optical filter 46. Therefore, dust from outside does not enter the space 30.

  In the present embodiment, the cushion 45 is made of rubber, but this is only an example. The cushion 45 may be manufactured using other elastic materials such as silicon, elastomer, and plastic.

  In the present embodiment, as shown in FIGS. 9 and 10, the CCD 44 and the cushion 45 are brought into contact with each other on the middle 91 of the inclined surface 80 of the cushion 45. A person skilled in the art is configured such that the CCD and the packing (cushion) come into contact with the uppermost portion corresponding to the opening 82 in FIG. 8 as shown in FIG. It is considered common to do. In patent document 1, although the deformation | transformation by bending of packing uppermost part is pointed out as a problem, the other problem also exists.

  FIG. 11 shows a cushion 45 formed using three molds 110a, 110b and 110c. By using the three molds 110a, 110b, and 110c, burrs are formed in the cushion 45 at the joints of the molds. Specifically, a burr 111a formed at the joint between the molds 110a and 110c, a burr 111b formed at the joint between the molds 110a and 110b, and a burr formed at the joint between the molds 110b and 110c. 111c.

  The burr 111a is formed on the top of the inclined surface 80 (the top of the opening 82 shown in FIG. 8). Therefore, if the CCD and the cushion 45 are brought into contact with each other at the uppermost part of the inclined surface 80, even if the uppermost part is not bent, a gap is generated by the burr 111a and the space 30 cannot be completely sealed. .

  Note that it is possible to remove some of the burr 111a, but a process for that purpose is required, and cost and time are required. Since the burr and the main body are continuously formed of the same material, it is very difficult to completely remove the burr. There is a risk that the body part will be removed if the burr is completely removed. In addition, it is almost impossible to prevent the burrs from being generated so that the joint portion of the mold is in complete contact with the object to be sealed.

  Further, since the edge portion of rubber or the like is easily deformed due to aging, the sealing of the space 30 cannot be maintained for a long time regardless of the presence or absence of burrs.

  Therefore, the problem caused by contact with the uppermost portion of the inclined surface 80 cannot be ignored. In patent document 1, the problem of the said structure is pointed out, the other structure is developed as a trigger of development to another structure.

  On the other hand, according to the present embodiment, even if such a burr 111a is present, it is not necessary to remove it, and the space 30 can be reliably sealed. In particular, compared with the packing described in FIG. 1 of Patent Document 1, the configuration of the cushion 45 is simple, and the mold can be easily manufactured. Therefore, it can be obtained or manufactured at low cost.

  According to this embodiment, since the optical element is brought into contact with the middle of the inclined surface of the elastic member (cushion 45), high sealing performance can be realized without being affected by burrs or variations in element shape. Further, even when the distance between the CCD and the optical filter, which are optical elements, varies, it is possible to achieve a high sealing degree. Furthermore, since the middle of the inclined surface is used, high sealing performance can be maintained even if the inclination of the CCD is adjusted. Furthermore, even if the elastic member is compressed or deformed during use, it is not affected.

  In the digital camera 100 according to the present embodiment, the CCD 44 is adjusted to be perpendicular to the optical axis of the optical system of the digital camera 100 by the assembly process and the adjustment process of the configuration described above, and between the CCD 44 and the optical filter 46. The space 30 is sealed using a cushion 45.

  In the above description, the sheet metal 42 having the shape shown in FIG. 5 has been described. However, this is an example, and other configurations may be employed.

  FIG. 12 shows a sheet metal 120 according to another configuration example. Parts having the same function or configuration as the sheet metal 42 shown in FIG.

  The sheet metal 120 is also composed of a first portion 50a, a second portion 50b, and two bridge portions 50c and 50d. Unlike the sheet metal 42, the sheet metal 120 has bridge portions 50c and 50d formed integrally.

  However, the bridge portion 50c is provided so as to extend in a direction parallel to the straight line connecting the fixing screw hole 42a and the adjusting screw hole 42b (X-axis direction in FIG. 5), and the bridge portion 50d is fixed. It is the same as the sheet metal 42 in that it is provided so as to extend in a direction (Y-axis direction in FIG. 5) parallel to a straight line connecting the screw hole 42a for adjustment and the screw hole 42c for adjustment. Since the direction in which the bridge portions 50c and 50d are elastically deformed is the same as that of the sheet metal 42, it can be intuitively determined which of the screws 41b and 41c should be tightened or loosened.

  Next, a configuration that does not require the springs 47b and 47c (FIGS. 4 and 6) will be described with reference to FIGS.

  FIG. 13 is a partial cross-sectional view of a sheet metal 130 according to still another configuration example according to the present embodiment. The sheet metal 130 is also provided with a bridge portion, and only the bridge portion 50c is shown in FIG.

  In the sheet metal 42, it is assumed that the first portion 50a, the second portion 50b, and the bridge portions 50c and 50d are provided on the same plane.

  On the other hand, in the sheet metal 130, at least one of the bridge portions 50c and 50d is warped in advance. As a result, in the sheet metal 130, the first portion 50a, the second portion 50b, and the bridge portions 50c and 50d do not exist on the same plane. Hereinafter, an example in which the bridge portion 50c is warped will be described.

  FIG. 13 shows a cross-sectional shape of the sheet metal 130 in a state where the screw 41b is not fastened to the screw hole 42b.

  The warp of the bridge portion 50c is given in a direction opposite to the direction in which the screw 41b is tightened. By giving warp in advance, when the screw 41b is tightened, the elastic force of the bridge portion 50c itself acts in the opposite direction. This elastic force corresponds to the elastic force of the spring 47b. This eliminates the need to provide the spring 47b.

  FIG. 14 shows a cross-sectional shape of the sheet metal 130 in a state where the screw 41b is tightened until the first portion 50a, the second portion 50b, and the bridge portion 50c are in a substantially horizontal state. Even in this state, the elastic force of the bridge portion 50c acts in the direction opposite to the tightening direction of the screw 41b.

  FIG. 15 shows a cross-sectional shape of the sheet metal 130 in a state where the screw 41b is further tightened from the state of FIG. The elastic force of the bridge part 50c larger than the elastic force in the state of FIG. 14 is acting in the direction opposite to the tightening direction of the screw 41b.

  Since the sheet metal 42 is designed so that the bridge portion has an elastic force, it is easy to warp in the direction opposite to the direction in which the screw 41b is tightened in advance, and the manufacturing cost is substantially increased. do not do. Since no spring is required, the cost can be reduced.

  In FIG. 8 described above, the cushion 45 is provided with the inclined surface 80 at the opening on the side where the CCD 44 is disposed. But this is an example. The inclined surface 80 may be provided only in the opening on the optical filter 46 side. At this time, the frame on the CCD 44 side is formed so as to be orthogonal to the optical axis 3. Alternatively, an inclined surface may be provided on each of the CCD 44 side and the optical filter 46 side. Instead of the optical filter 46, a transparent plate that is transparent with respect to visible light may be provided.

  The present invention can be applied to an assembly process of an optical system such as a digital camera having an image sensor and a position adjustment process between an optical axis and an image sensor, and is useful for forming an accurate subject image on the image sensor. .

It is a figure which shows the external appearance of the digital camera 100 by embodiment of this invention, (a) is a front view, (b) is a rear view, (c) is a top view. 1 is a cross-sectional view of a lens barrel 1 by a plane including an optical axis 3. 2 is a detailed sectional view of a CCD unit 2. FIG. The assembly drawing of the CCD unit 2 is shown. It is an enlarged view of the sheet metal. It is sectional drawing of the sheet metal 42 of the clamp | tightening part at the time of the clamp | tightening of screws 41b and 41c. FIG. 6 is a perspective view of a cushion 45. It is sectional drawing of the cushion 45 cut | disconnected along the assembly direction. It is a figure which shows the state just before CCD44 is assembled | attached to the cushion 45. FIG. It is a figure which shows the state immediately after CCD44 was assembled | attached to the cushion 45. FIG. It is a figure which shows the cushion 45 formed using three metal mold | die 110a, 110b, and 110c. It is a figure which shows the sheet metal 120 by another structural example. It is a partial cross section figure of the sheet metal 130 by the further another structural example. It is a figure which shows the cross-sectional shape of the sheet metal 130 in the state which fastened the screw | thread 41b until the 1st part 50a, the 2nd part 50b, and the bridge | bridging part 50c became a substantially horizontal state. It is a figure which shows the cross-sectional shape of the sheet metal 130 in the state which clamp | tightened the screw 41b further from the state of FIG.

Explanation of symbols

42 Sheet metal 43 Flexible printed circuit board 44 CCD
45 Cushion 46 Optical filter 47b, 47c Spring 48 Master flange 50a 1st part of sheet metal 42 50b 2nd part of sheet metal 42 50c, 50d Bridge part 80 Inclined surface of cushion 45 81 Frame of cushion 45 82 Wide opening 83 of cushion 45 Narrow opening 91 of cushion 45 Midway of inclined surface 80

Claims (4)

A first optical member and a second optical member provided on the optical axis, one of which is an image sensor, and a first optical member and a second optical member,
And an elastic member disposed so as to surround a space between the first optical member and the second optical member,
The elastic member has an inclined surface inclined with respect to the optical axis;
An imaging apparatus that seals the space by contacting at least one of the first optical member and the second optical member with the elastic member in the middle of the inclined surface. The first optical member is an image sensor;
The second optical member is an optical filter;
The elastic member further includes an orthogonal surface that is orthogonal to the optical axis and is in contact with the second optical member,
The imaging apparatus according to claim 1, wherein the first optical member abuts on the elastic member on the inclined surface to elastically deform the elastic member, thereby sealing the space.   The elastic member includes a first inclined surface and a second inclined surface that are inclined with respect to the optical axis, the first inclined surface is in contact with the first optical member, and the second inclined surface is The imaging device according to claim 1, wherein the imaging device is in contact with the second optical member.   The imaging apparatus according to claim 1, wherein one of the first optical member and the second optical member is an imaging element, and the other is an optical filter.

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