JP2008109400A - Imaging device and method of assembling the imaging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging device prevented from being internally polluted by dust, or the like. <P>SOLUTION: An elastic member 4 is attached so as to cover a peripheral edge part of a circuit board 3 connected to an imaging device 2, and a front case 8 provided with a light incident hole, through which light is made incident on the imaging device 2 is disposed on a subject side of the elastic member 4; and a rear case 9 is disposed in a side opposite to a subject, of the elastic member 4, and the elastic member 4 is pressed and caught between the front case 8 and the rear case 9, whereby the occurrence of dust, or the like, from the peripheral edge of the circuit board 3 is prevented by the elastic member 4 to prevent dust from infiltrating a light-receiving area of the imaging device 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to an imaging device that prevents dust generation in the imaging device and a method for assembling the imaging device.

  In recent years, the number of pixels and the definition of an image pickup apparatus have been increased, and dust and dust in the image pickup apparatus that have entered the light receiving area of the image pickup element have been reflected in the photographed image, and the influence thereof cannot be ignored. In order to solve this problem, various technologies have been developed to prevent dust and dirt from entering an image sensor such as a CCD or CMOS.

  Patent Document 1 describes an imaging device that hermetically seals a light receiving area so that dust or the like does not enter the light receiving area of the image sensor.

Other methods to prevent dust generation on the circuit board by applying adhesive to the end face of the circuit board, vapor deposition of dust-free members, etc., as well as dust and dust from the outside of the imaging device as well as dust and dust inside the imaging device In order to prevent entry, there has been disclosed a technique of an imaging apparatus that covers the entire unit of a camera module including a lens and a circuit board with a dustproof member.
JP-A-7-202152

  However, according to the imaging device of Patent Document 1, the object is to hermetically seal the light receiving area of the imaging element, and no consideration is given to dust generated from the end face of the circuit board. There is a possibility that the light receiving area may be contaminated by dust or the like before the light receiving area is hermetically sealed, and when the sealing member loses hermeticity due to aging deterioration, the light receiving area is contaminated by dust or the like.

  In addition, even if dust generation is prevented by depositing adhesive or dust-free material on the end face of the circuit board, etc., the process is dense and complex, and the work process takes time and has a large economic burden. In addition, there is a problem that it cannot be replaced even if it is damaged by an external impact, and contamination of the image sensor light receiving area cannot be prevented within a short time.

  The present invention has been made in view of the above problems, and an object of the present invention is to prevent the generation of dust and dust in the imaging device and to assemble the imaging device in a simple process and to the imaging device. To provide an assembly method.

  An image pickup apparatus according to the present invention includes a circuit board, an image pickup element connected to the circuit board, an optical system that focuses external light on the image pickup element, and an elastic member that covers a peripheral portion of the circuit board. A front case for housing the circuit board and a rear case, the front case is provided with a light entrance for allowing light to enter the image pickup device via the optical system, and the elastic member is disposed on the front case and the front case. It is characterized by being sandwiched between the rear case.

  Another imaging device of the present invention is characterized in that an inner wall surface closer to the subject than a surface of the front case sandwiching the elastic member is positioned closer to the optical axis side of the optical system than the periphery of the circuit board.

  In another imaging device of the present invention, a convex portion is provided on a surface of the front case and / or the rear case that sandwiches the elastic member, and a concave portion or a step portion is provided at the position of the elastic member corresponding to the convex portion. It is characterized by that.

  Another imaging device according to the present invention is characterized in that a protrusion for determining a position of the circuit board in the optical axis direction is provided in the front case and / or the rear case.

  Another imaging device according to the present invention includes an auxiliary unit that assists in attaching or removing the elastic member to and from the circuit board at an end on the side surface of the circuit board of the elastic member and / or an end on the side surface opposite to the object. Is provided.

  In another imaging device of the present invention, a conductive portion is provided on all or a part of the peripheral edge of the circuit board, and at least a portion of the elastic member that covers the conductive portion is a conductive conductive elastic portion. Features.

  Another imaging device of the present invention is the elastic member that covers the peripheral edge of the circuit board from one end to the other end, and a conductive portion is provided on all or a part of the peripheral edge of the circuit board. It is provided that both end portions of the elastic member are conductive elastic portions that can be electrically connected to the conductive portion.

Another imaging device of the present invention is the elastic member that covers the peripheral edge of the circuit board from one end to the other end, and a conductive portion is provided on a part or all of the peripheral edge of the circuit board. Provided,
A conductive elastic member that is connected to the conductive portion and that covers the elastic member and / or is covered with the elastic member is provided.

  Another imaging device of the present invention is the elastic member that covers the peripheral edge of the circuit board from one end to the other end, and is a conductive discharge portion on the front case and / or the rear case. A conductive elastic member that provides a conductive portion at a part of the peripheral edge of the circuit board and connects the discharge portion and the conductive portion through one end and the other end of the elastic member. Is provided.

  An image pickup apparatus assembly method according to the present invention includes a circuit board, an image sensor connected to the circuit board, and an elastic member that covers a peripheral portion of the circuit board, and a front case and a rear case that accommodate the circuit board. A method of assembling an imaging device comprising: a case, and a step of clamping the elastic member between the front case and the rear case after the step of covering the periphery of the circuit board with the elastic member. It is characterized by.

  The covering for covering the peripheral portion of the circuit board with the elastic member may be one in which another member covering the circuit board is further covered with the elastic member between the circuit board and the elastic member, or one of the elastic members. After covering a circuit board with an edge part, what also coat | covered one edge part with the other edge part is also contained.

  According to the present invention, by covering the peripheral edge of the circuit board with the elastic member in the upstream process of the imaging apparatus assembly process, it is possible to prevent contamination in the imaging apparatus of dust and dust generated from the end face of the circuit board, It is possible to prevent the image sensor light receiving area from being contaminated by dust or the like.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

(Example 1)
FIG. 1 is a cross-sectional view of the imaging apparatus 10 of the present invention, and FIG. 2 is an external view of the circuit board 3 viewed from the subject side.

  1 and 2, the imaging apparatus 10 includes a circuit component 1 such as an IC or a drive circuit, an imaging device 2 such as a CCD or a CMOS, and a circuit board 3 connected to the circuit component 1 or the imaging device 2. The elastic member 4 that is mounted so as to cover the peripheral edge of the circuit board 3, the optical filter 5 that allows only required light to enter the light receiving area of the image sensor 2, and external light is collected in the light receiving area of the image sensor 2. The optical filter 5 and the holding member 7 that holds the lens 6 are combined with a front case 8 and a rear case 9 that accommodate the circuit board 3 together.

  At this time, the front case 8 is provided with an entrance for allowing external light to enter the image pickup device 2, and the image pickup device 2 is connected at a predetermined position on the circuit board 3 so that the incident light can be received appropriately. The holding member 7 is installed on the circuit board 3 corresponding to the position and the entrance, the front case 8 is disposed on the subject side of the elastic member 4, and the rear case 9 is disposed on the opposite side of the elastic member 4 from the subject. The front case 8 and the rear case 9 press the circuit board 3 via the elastic member 4 and the elastic member 4 to sandwich the elastic member 4 and the circuit board 3.

  Next, an arrangement configuration of the circuit board 3, the elastic member 4, the front case 8 and the rear case 9 and a shape modification example of the elastic member 4 will be described with reference to FIG. 3.

  FIG. 3 is a cross-sectional view showing a peripheral portion of the elastic member, and FIGS. 3A to 3D are examples of deformation of the elastic member, the front case, and the rear case, respectively.

  First, a description will be given based on FIG. 3A. The elastic member 4 is attached while covering the peripheral edge of the circuit board 3 from the side of the subject to the side opposite to the subject, and the front case is attached to the subject side of the elastic member 4. 8 and a rear case 9 on the opposite side of the subject, and the circuit board 3 is pressed by the front case 8 and the rear case 9 via the elastic member 4 and the elastic member 4, and the elastic member 4 and the circuit board. 3 is pinched. At this time, the optical axis between the end 301 which is the periphery of the circuit board 3 and the inner wall surface 801 on the subject side from the surface sandwiching the elastic member 4 of the front case 8 is substantially perpendicular to the subject side surface of the circuit board 3. In the positional relationship, the inner wall surface 801 of the front case 8 is located on the optical axis side with respect to the end portion 301 of the circuit board 3.

  With such a positional relationship, even when the elastic member 4 is interposed between the front case 8 and the circuit board 3, the circuit board 3 can be stably fixed at a predetermined position in the optical axis direction.

  In addition, the inner wall surface 901 on the opposite side of the subject from the surface holding the elastic member 4 of the rear case 9 together with the inner wall surface 801 of the front case 8 is arranged on the optical axis side from the end portion 301 of the circuit board 3. 3 can be more stably fixed at a predetermined position in the optical axis direction.

  Next, differences from FIG. 3A will be described with reference to FIG.

  Convex portions 812 and 912 are provided on the clamping surfaces for sandwiching the elastic member 41 of the front case 81 and the rear case 91, and a step portion 411 is provided at a position corresponding to the convex portions 812 and 912 of the elastic member 41.

  By providing the convex portions 812 and 912 and the step portion 411, the position fixing in the direction substantially perpendicular to the optical axis of the elastic member 41 and the front case 81 and the rear case 91 or in the direction substantially parallel to the subject side surface of the circuit board 3 is strengthened. The front case 81 and the rear case due to the outward force of the front case 81 and the rear case 91 of the elastic member 41 generated when the elastic member 41 is sandwiched between the front case 81 and the rear case 91. It is possible to prevent the positional deviation in the direction perpendicular to the optical axis 91 or in the direction parallel to the subject side surface of the circuit board 3 and securely hold the elastic member 41 and the circuit board 3.

  That is, when the elastic member 41 is sandwiched between the front case 81 and the rear case 91, a pressing force is applied to the front case 81 in a direction away from the optical axis from the elastic member 41, but the convex portion 812 of the front case 81 and the elastic member 41 The step portion 411 applies a repulsive force and a pressing force from the elastic member 41 in a direction approaching the optical axis, thereby preventing the positional displacement between the front case 81 and the elastic member 41. The step portion 411 prevents the front case 81 and the rear case 91 from moving. Since the direction perpendicular to the optical axis or the direction parallel to the subject side surface of the circuit board 3 is fixed, it is possible to prevent positional deviation.

  As an optimum configuration for preventing misalignment by this configuration, the sizes of the convex portions 812 and 912 in the direction substantially perpendicular to the optical axis or in the direction substantially parallel to the subject side surface of the circuit board 3 By making the size the same from the inner wall surfaces 811 and 911 to the end 301 of the circuit board 3, the pressing force applied from the object side pressing the elastic member 41 by the convex parts 812 and 912 and the direction opposite to the object is equal. Thus, the pressing force applied to the peripheral edge portion of the circuit board 3 is also equalized, so that it is possible to prevent an inclination shift of the circuit board 3 with respect to the optical axis.

  Next, differences from FIG. 3B will be described with reference to FIG.

  The elastic member 41 is different in that the step 411 of the elastic member 41 is an elastic member 42 having a recess 321, and in addition to the effect of providing the step 411, the protrusions 812 and 912 described with reference to FIG. When the front case 81 and the rear case 91 are pressed, a force in a direction substantially perpendicular to the optical axis applied to the front case 81 or in a direction substantially parallel to the subject side surface of the circuit board 3 and away from the optical axis is applied to the rear case 9. The displacement between the elastic member 42 and the front case 81 and the rear case 91 due to a force in a direction substantially perpendicular to the optical axis or in a direction substantially parallel to the subject side surface of the circuit board 3 and approaching the optical axis can be prevented. Position fixing of the elastic member 42, the front case 81, and the rear case 91 can be further strengthened.

  The convex portions 812 and 912 may be provided corresponding to the entire peripheral portion of the circuit board 3 corresponding to the elastic members 41 and 42 or may be provided in part. When the circuit board 3 is shown, for example, it may be provided at the four corners of the circuit board 3 shown in the figure, or it may be provided at intervals of a quarter of the circumference if the circuit board is circular. . A convex portion may be provided corresponding to the shape of the circuit board as appropriate.

  Next, differences from FIG. 3A will be described with reference to FIG.

  The elastic member 43 is different in that the auxiliary member 431 is provided at the end of the elastic member 4 on the side opposite to the subject of the circuit board 3, and it is easy to attach and remove the elastic member 43 to and from the circuit board 3. Can do.

  That is, when the elastic member 43 is attached to and removed from the circuit board 3, the end 432 of the elastic member 43 and the auxiliary part 431 on the subject side surface of the circuit board 3 are pulled away from the circuit board 3. This is done by expanding the part where the is mounted.

  As described above, by providing the auxiliary portion 431, the elastic member 43 can be easily attached to the circuit board 3 and can be easily removed, and the attaching and removing operations of the elastic member 43 to and from the circuit board 3 are shortened. Can be done in time.

  In this example, the auxiliary portion 431 is provided at the end of the elastic member 43 opposite to the subject. However, the same effect as described above can be obtained by providing the auxiliary portion 431 at the end of the subject or at the subject side and the end opposite to the subject. Obtainable.

  Next, the assembly process of the imaging device 10 will be described.

  FIG. 4 is an assembly process flow of the imaging apparatus 10.

  Referring to FIG. 4, in step 1, the elastic member 4 is attached so as to cover the peripheral portion of the circuit board 3 on which the circuit component 1 is mounted, and in step 2, the image sensor 2 is connected to a predetermined position on the circuit board 4. Then, the holding member 7 holding the lens 6 and the optical filter 5 in step 3 is installed on the circuit board 3 corresponding to the connection position of the image pickup device 2, and the elastic member 4 is connected to the front case 8 in step 4. The elastic member 4 is clamped together with the circuit board 3 by being pressed by the rear case 9.

  In this way, by attaching the elastic member 4 to the peripheral edge of the circuit board 3 in the upstream process (initial process) of all the processes, dust and dust generated from the peripheral edge of the circuit board 3 are collected in the light receiving area of the image sensor 2. Can be prevented from entering.

  In addition, after step 1 and step 2, the holding member 7 is installed on the circuit board 3 so as to seal the light receiving area space of the image sensor 2, and an O-ring, packing, or the like is provided between the front case 8 and the holding member 7. With the sealed configuration, it is possible to further prevent dust and dust from entering the light receiving area of the image pickup device 2 and the image pickup apparatus 10 and further improve the dustproof effect.

  Further, since the elastic member 4 extending over the circuit board 3 is pressed and sandwiched between the front case 8 and the rear case 9 and the arrangement position of the circuit board 3 and the like in the optical axis direction is fixed, other members are used. Since it is not necessary to fix the arrangement position of the circuit board 3 or the like, there is an effect that the work process is shortened and the member cost is reduced.

  Although the elastic member 4 is attached to the peripheral portion of the circuit board 3 in step 1, the elastic member 4 may be attached to the peripheral portion of the circuit board 3 after the imaging element 2 is connected to the circuit board 3. Even if the elastic member 4 is attached to the circuit board 3 while cleaning dust or dust in the light receiving area of the image pickup device 2 with air or the like or immediately after cleaning, a dustproof effect can be obtained.

(Example 2)
Next, the structure which provided the electroconductive elastic part or the electroconductive elastic member in the elastic member 4 is demonstrated based on FIG. 5 thru | or FIG.

  FIG. 5 is an external view of a circuit board in which a conductive part is provided at the peripheral edge of the circuit board, FIG. 6 is a cross-sectional view showing a peripheral part of the conductive elastic part attached to the circuit board, and FIG. 7 is an elastic member. It is the external view which visually recognized the circuit board which mounted | wore from the subject side.

  Referring to FIG. 5, conductive portions 20 a to 20 e having different shapes are provided on the peripheral portion of the circuit board 31, the conductive portions 20 a are provided in a circular shape on the subject side surface of the circuit board 31, and the conductive portions 20 b are provided on the circuit board 3. Is provided so as to cover the end surface of the circuit board 31 from the subject side to the surface opposite to the subject.

  The conductive portion 20c has a concave portion on the end surface of the circuit board 31, and is provided on the inner surface of the concave portion. The conductive portion 20d is on the subject side surface of the circuit board 31 and more than half the length of one side of the circuit board 31. The conductive portion 20 e is provided on the subject side surface of the circuit board 3 and on one side of the circuit board 31.

  In this example, the conductive portions 20a to 20e having different shapes are provided on the periphery of the circuit board 31, but the conductive portions having the same shape may be provided on all or part of the periphery of the circuit board 31. It can be changed according to the design.

  Here, the conductive portions 20b, 20c, and 20e having a particularly characteristic configuration will be described with reference to FIGS.

  FIG. 6A is a cross-sectional view showing a peripheral portion of the conductive portion 20 b or the conductive elastic portion 47 shown in the a-1 region of the circuit board 31.

  The conductive elastic portion 47 is provided on a part of the elastic member 4 as shown in FIG. 7, and is attached to the circuit board 47 so as to further cover the conductive portion 20b provided to cover the end face of the circuit board 31. Yes.

  Therefore, dust generation of the circuit board 31 is prevented by the conductive portion 20b and also by the elastic member 4, so that the dustproof effect can be further enhanced. Further, by protecting the conductive portion 20b with the elastic member 4, corrosion and deterioration can be suppressed, and by providing the conductive elastic portion 47 which is conductive, electricity from the conductive portion 20b is not shown in the front case and the rear. Since it can discharge out of the imaging device 10 through the case, it is possible to prevent problems such as the imaging element 2 due to static electricity or the like.

  Next, a description will be given based on FIG. FIG. 6B is a cross-sectional view showing the periphery of the conductive portion 20 e or the conductive elastic portion 47 shown in the a-2 region of the circuit board 31.

  The conductive portion 20e shown in the a-2 region of the circuit board 31 is provided on the subject side surface of the circuit board 31 and on the side surface opposite to the subject, and the conductive portion 20e is provided on the side surface opposite to the subject. The conductive portion 20e provided on the side surface of the subject with the circuit board 3 sandwiched between the position of the conductive portion 20e and the circuit board 3 is part of the circuit board so that the conductive portion 20e is provided on the side surface opposite to the subject. It extends from the end face of 31 to the inside of the circuit board 3 so as to serve as a mark.

  Compared with the configuration of FIG. 6A, the conductive portion 20e is provided on the subject side of the circuit board 31 and on the side opposite to the subject, and there is no step of covering the end face of the circuit board 31 with the conductive portion. This is effective in saving the conductive part material. Other configurations and effects are the same as those of the configuration of FIG.

  Next, description will be made based on FIG. FIG. 6C is a cross-sectional view showing the periphery of the conductive portion 20 c or the conductive elastic portion 48 shown in the a-3 region of the circuit board 31.

  The conductive portion 20c shown in the a-3 region of the circuit board 31 has a recess 311 on the end surface of the circuit board 31, and is provided on the inner surface of the recess 311. The conductive elastic portion 48 is a recess 311 of the conductive portion 20c. The protrusion part 481 is provided corresponding to this, and it is made conductive by fitting the protrusion part 481 into the recessed part 311.

  Therefore, when the elastic member 4 is mounted by providing the concave portion 311 in the circuit board 31, it should be confirmed that the conductive portion 20b and the conductive elastic portion 48 are surely connected while serving as a mark as a base point for mounting. Therefore, it is possible to prevent displacement of the conductive portion 20b and the conductive elastic member 48.

  Although the conductive elastic portions 47 and 48 have been described as a part of the elastic member 4 in this example, the entire elastic member 4 may be the conductive elastic portion 47 or 48 without being limited thereto.

  Further, there is no description of the front case and the rear case for discharging electricity from the conductive elastic part outside the imaging device 10, but the circuit board is in contact with the conductive elastic parts 47 and 48 in the front case and the rear case. It suffices to have a configuration capable of discharging 31 electricity to the outside of the imaging device 10.

  For example, referring to FIG. 14, conductive discharge portions 861 and 961 are provided in the front case 86 and the rear case 96, and the discharge portion 861 of the front case 86 is brought into contact with the conductive elastic portion 47 included in the elastic member 4. The discharge unit 861 is connected or brought into contact with the discharge unit 961 of the rear case 96 to discharge electricity to the outside of the imaging device 10.

  The difference in shape between the discharge part 861 in FIG. 14A and the discharge part 862 in FIG. 14B is that the discharge part 862 has a plurality of protrusions so as to increase the contact area with the conductive elastic part 47. Is different. By increasing the contact area, the electrical resistance is reduced to facilitate discharge outside the imaging device 10.

  The configurations of the front case and the rear case that discharge outside the imaging apparatus 10 are not limited to the above configuration.

  In addition, as a material of the conductive elastic part, metal coating is applied to metal powder containing platinum, gold, silver, nickel, carbon, cobalt, copper, tin, aluminum, palladium, alloy powder containing solder, and organic polymer powder. Silicone rubber with attached conductive fine powder, conductive fine powder coated with metal on inorganic fine powder, rubber having epoxy group or halogen atom in molecular chain, epichlorohydrin rubber, epichlorohydrin-ethylene oxide rubber, epichlorohydrin There are propylene oxide rubber, butyl rubber, epoxy group-containing acrylic rubber, and the like, and it is preferable to make the elastic member 4 and the elasticity uniform.

  This is to prevent the pressing force from becoming non-uniform when the elastic member is pressed by the front case and the rear case, and the inclination of the circuit board 3 with respect to the optical axis.

(Example 3)
In this example, the elastic member is cut into a predetermined shape and the peripheral edge of the circuit board is covered from one end to the other end, and the conductive elastic member that can be attached to the elastic member is provided. Will be described.

  First, a method for attaching the elastic member to the circuit board will be described with reference to FIGS.

  FIG. 8 is an external view when the elastic member is mounted on the circuit board. FIG. 9 is an external view in which an elastic member is covered or a conductive elastic member that is covered with an elastic member is mounted on a circuit board. FIG. 10 is a cross-sectional view taken along line AA and BB in FIG. In FIG. 9, the elastic member and the conductive elastic member are shown apart from each other for easy understanding. However, as shown in FIG. 10, the elastic member and the conductive elastic member are stacked on the circuit board as required.

  Referring to FIG. 8, FIG. 8A shows an appearance in which the protruding portion 4011 is mounted on the circuit board 3 at one end of the elastic member 401, and FIG. 8B shows the elastic member 401 on the circuit board 3. FIG. 8C shows an appearance in which a concave portion 4012 that covers the protruding portion 4011 is attached to the circuit board 3 at the other end of the elastic member 401.

  In addition, although the protrusion part 4011 and the recessed part 4012 of the elastic member 401 shown in FIG.8 (b) are shown apart, it makes it easy to understand a structure and the protrusion part 4011 becomes a structure covered with a recessed part.

  When the elastic member 401 is attached to the circuit board 3, the protrusion 4011 is first attached to the circuit board 3, and the recess 4012 is attached to the circuit board 3 so as to cover the protrusion 4011.

  As described above, by providing the end portion like the elastic member 401, the mounting operation becomes easier as compared with the annular elastic member, and the work efficiency can be improved.

  As another example, the protruding portion 4011 and the recessed portion 4012 may be configured as conductive elastic portions and connected to the conductive portions 20a to 20e (hereinafter referred to as the conductive portion 20) of the circuit board 31. By covering the peripheral edge of the circuit board 31 from the protrusion 4011, the protrusion 4011 can be a base point at the time of covering and can be reliably connected to the conductive part 20, and the recess 4012 covering the protrusion 4011. Since it is also conductive, electricity of the circuit board 31 can be discharged outside the imaging device 10 through a front case and a rear case (not shown).

  Therefore, it is possible to further improve work efficiency such as work for connecting to the conductive part 20 and work for covering the peripheral edge of the circuit board 31.

  Next, the conductive elastic members 49 and 50 that can be attached to the elastic members 44 and 45 will be described.

  9A and 10A, one end and the other end of the elastic member 44 are provided with protrusions 441 and 442 that protrude in the circumferential direction of the circuit board 31. Corresponding to the protrusions 441 and 442, concave portions 491 are provided at both ends of the conductive elastic member 49 in the circumferential direction of the circuit board 31, the elastic member 44 is attached to the circuit board 3, and the concave portions 491 of the conductive elastic member 49 are elastic. The circuit board 31 is mounted so as to cover the projecting portions 441 and 442 of the member 44.

  The conductive elastic member 49 is attached to the circuit board 3 while covering the protruding portions 441 and 442 of the elastic member 44, so that one end and the other end of the elastic member 44 are removed from the circuit board 3. It is possible to confirm that the conductive portion 20 of the circuit board 31 and the conductive elastic member 49 are securely connected, and to prevent a connection error.

  Next, based on FIG. 9B and FIG. 10B, concave portions 451 and 452 that are recessed in the circumferential direction of the circuit board 31 are provided at one end portion and the other end portion of the elastic member 45, Protruding portions 501 are provided at both ends of the conductive elastic member 50 in the circumferential direction of the circuit board 3 so as to correspond to the recesses 451 and 452, and the conductive elastic member 50 is attached to the circuit board 3. The concave portions 451 and 452 are attached to the circuit board 31 so as to cover the protruding portions 501 of the conductive elastic member 50.

  The elastic member 45 and the conductive elastic member 50 are mounted on the circuit board 31 by first mounting the conductive elastic member 50 and using the conductive elastic member 50 as a mark, one protruding portion of the conductive elastic member 50. The concave portion 451 of the elastic member 45 is attached to the circuit board 31 so as to cover 501, and the concave portion 452 of the elastic member 45 is attached to the circuit board 3 so as to cover the other protruding portion 501 of the conductive elastic member 50. To do.

  With such a configuration, the conductive elastic member 50 and the conductive portion 20 can be reliably connected, and the peripheral portion of the circuit board 3 is attached to the elastic member 45 with the conductive elastic member 50 as a mark. Therefore, the mounting operation becomes easy and the work process can be shortened. Also, the conductive elastic member 50 can be prevented from being detached from the circuit board 31 by covering and fixing the protruding portion 501 of the conductive elastic member 50 with the concave portions 451 and 452 of the elastic member 45.

  Next, with reference to FIG. 10C, the conductive elastic member 49 has protrusions 491 at both ends and the conductive elastic member 50 has recesses 501 at both ends, but the conductive elastic member 51 has one end. 1 in that a protrusion 511 is provided and a recess 512 is provided at the other end. Another difference is that a concave portion 461 is provided at one end of the elastic member 46 and a protruding portion 512 is provided at the other end corresponding to the protruding portion 511 and the concave portion 512 of the conductive elastic member 51.

  A method for mounting the elastic member 46 and the conductive elastic member 51 on the circuit board 31 will be described.

  First, the protruding portion 462 of the elastic member 46 is attached to the circuit board 31, and then the conductive elastic member 51 is attached to the circuit board 3 so as to cover the protruding portion 462 with the concave portion 512 of the conductive elastic member 51. The concave portion 461 of the elastic member 46 is attached to the circuit board 3 so as to cover the protruding portion 511 of the elastic elastic member 51.

  As described above, the protrusion 462 of the elastic member 46, the conductive elastic member 51, and the concave portion 461 of the elastic member 46 are attached to the circuit board 3 in this order, so that the protrusion of the elastic member 46 is removed from the circuit board 31. Even if a force is applied, the conductive elastic member 51 prevents the circuit board 31 from being pulled out, and even if a force is applied to the recess 461 of the elastic member 46 from the circuit board 31, the conductive elastic member 51 can Since the portion can be covered, it is possible to prevent the dustproof effect from being lowered.

  The material of the conductive elastic member may be the same as that of the conductive elastic portion.

Example 4
In this example, the position fixing in the optical axis direction of the circuit board in the front case and the rear case will be described based on FIG. 11, and the method of fixing the front case and the rear case together will be described based on FIG. 11 and 12 are cross-sectional views showing the periphery of the elastic member.

  First, a description will be given with reference to FIG. 11A. A protrusion 922 is provided on the surface of the rear case 92 that sandwiches the elastic member 4, and the protrusion 922 presses the circuit board 3 to the optical axis direction of the circuit board 3. Is provided with a reference plane 921 for determining the position of.

  In FIG. 11B, a protrusion 822 is provided on the surface of the front case 82 that holds the elastic member 4, and the protrusion 822 presses the circuit board 3 to determine the position of the circuit board 3 in the optical axis direction. It has.

  Thus, by providing the reference surfaces 821 and 921 on the front case 82 and the rear case 92, the positional relationship between the front case 82 or the rear case 92 and the circuit board 3 is fixed, and the optical axis of the circuit board 3 is fixed. Since the position of the direction is fixed, even when pressure, impact, or the like is applied from the outside of the image pickup apparatus 10, the image pickup device 2 is prevented from being tilted with respect to the optical axis, and shooting with a good imaging field of view can be performed.

  The protrusions 822 and 922 may be provided corresponding to the entire peripheral edge of the circuit board 3 or may be provided in part. When the circuit board 3 is shown, for example, it may be provided at the four corners of the circuit board 3 shown in the figure, or it may be provided at intervals of a quarter of the circumference if the circuit board is circular. . A convex portion may be provided corresponding to the shape of the circuit board as appropriate.

  Next, a method for fixing the front case and the rear case and a method for pressing the elastic member will be described with reference to FIG.

  Referring to FIG. 12A, the front case 83 is provided with a screwing portion 831 at the end opposite to the subject, and the rear case 93 is provided with a screwing portion 931 at the subject side. In this process, the elastic member 4 is pressed by the front case 83 and the rear case 93 in the process of screwing and fixing the screwing portion 831 and the screwing portion 931 of the rear case 93.

  Next, with reference to FIG. 12 (b), instead of the configuration of screwing and fixing the front case 83 and the rear case 93, a locking portion 841 is provided in the front case 84, and the locking portion 841 is locked. The rear case 94 is provided with a recess 941, the front case 84 is disposed on the subject side of the elastic member 4, the rear case 94 is disposed on the opposite side of the subject of the elastic member 4, and the front case 84 and the rear case 94 are fitted. By combining and pressing in the direction of the optical axis and in the direction of the circuit board 3, the front case 84 and the rear case 94 can be fixed while pressing the elastic member 4.

  Next, based on FIG. 12C, the screw 11 is inserted through the screw 11 with the end of the front case 85 opposite to the subject and the end of the rear case 95 on the subject side being inserted. And the front case 85 and the rear case 95 are fixed.

  As described above, the front case and the rear case can be fixed with a simple structure, and the elastic member can be pressed by the front case and the rear case, so that the work process can be shortened and the fixing work can be performed reliably. It should be noted that the present invention is not limited to this example, and any structure that can press the elastic member between the front case and the rear case may be used.

(Example 5)
This example shows another embodiment in which an elastic member and a conductive elastic member are mounted on a circuit board.

  In the third embodiment, the conductive elastic member is covered with the elastic member. However, in this example, the conductive elastic member passes through the elastic member and is connected to the conductive portion of the circuit board. It is characterized by that.

  This will be described with reference to FIG. FIG. 13 is a cross-sectional view showing a peripheral portion of the elastic member, and FIGS. 13A-1 to 13A-3 show a conductive elastic member made into a rod shape or a flat plate shape, and FIGS. (B-3) is a conductive elastic member having a T-shaped cross section.

  Explaining based on FIGS. 13A-1 to 13A-3, the circuit board 31 is provided with a conductive portion 20b so as to cover the end face of the circuit board 31, and a conductive elastic member connected to the conductive portion 20b. 52, and an elastic member 61 penetrating through the conductive elastic member 52 is provided.

  The elastic member 61 includes a protruding portion 611 that protrudes in the circumferential direction of the circuit board 3 at one end portion and a concave portion 612 at the other end portion, and the conductive elastic member 61 passes through the protruding portion 611 and the concave portion 612. A through portion is provided.

  Here, the mounting process of the elastic member 61 to the circuit board 31 and the mounting process of the circuit board 31 of the conductive elastic member 61 will be described.

  First, the protruding portion 611 of the elastic member 61 is mounted in correspondence with the position of the conductive portion 20 b of the circuit board 31, and the conductive elastic member 61 is passed through the through portion of the protruding portion 611 to the conductive portion 20 b of the circuit board 31. With the conductive elastic member 61 as a mark, the concave portion 612 of the elastic member 61 is attached to the circuit board 31 so as to penetrate the conductive elastic member 61 and cover the protruding portion 611.

  In this way, the conductive elastic member 52 is configured to penetrate the protruding portion 611 and the recessed portion 612 of the elastic member 61, and the circuit board in this order is the protruding portion 611 of the elastic member 61, the conductive elastic member 52, and the recessed portion 612 of the elastic member 61. By attaching to 31, it becomes easy to understand the process procedure at the time of attachment, and it becomes possible to shorten the work process. In particular, since the conductive elastic member 52 protrudes from the protruding portion 611 of the elastic member 61, there is an effect that it is easy to mount the conductive elastic member 52 as a mark when the concave portion 612 of the elastic member 61 is mounted on the circuit board 31.

  Next, based on FIGS. 13 (b-1) to (b-3), it is more conductive than the conductive elastic member 52 described in FIGS. 13 (a-1) to (a-3). The elastic member 53 has a T-shaped shape in which the connection surface with the conductive portion 20 is increased in the thickness direction of the circuit board 31 and the size in the thickness direction of the circuit board 3 at the portion penetrating the elastic member 61 is reduced. There is a feature in that.

  In other words, the protruding portion 611 of the elastic member 61 connects and fixes a portion of the conductive elastic member 53 that is enlarged in the thickness direction of the circuit board 31 to the conductive portion 20d, and the conductive elastic member 53 in the thickness direction of the circuit board 31. A portion with a reduced size is passed through and attached to the circuit board 31, and the recess 612 of the elastic member 61 passes through a portion with a reduced size in the thickness direction of the circuit board 31 of the conductive elastic member 53 and protrudes. The circuit board 31 is mounted so as to cover the portion 611.

  In this way, the conductive elastic member 53 is mounted on the circuit board 31 in this order from the conductive elastic member 53, the protruding portion 611 of the elastic member 62, and the concave portion 612. Without being removed, the conductive portion 20b of the circuit board 3 is securely connected, and poor connection between the conductive portion 20b and the conductive elastic member 52 can be prevented.

  It is also possible to replace the conductive elastic member 52 with a conductive member such as metal, but when the elastic member is pressed in the front case and the rear case, a space is created between the conductive member and the front case. Since there is a possibility of causing defects, it is preferable that there is elasticity.

  In addition, the conductive elastic member protrudes from the elastic member by increasing the elasticity and elasticity when the conductive elastic member is pressed compared to the elastic member, and the conductive portion of the front case and the circuit board protrudes from the elastic member. Can be securely connected, and poor connection can be prevented.

  Note that the present invention is not limited to this embodiment, and various changes can be made.

For example, the convex portions 812 and 912 provided in the front case 81 and the rear case 91 described in the first embodiment are provided corresponding to the conductive portions 20a to 20e of the circuit board 31 in the second embodiment, and the convex portions 812 and 912 Conductive elastic portions 47 and 48 and conductive elastic members 49 to 51 may be provided between the conductive portions 20a to 20e. By providing the conductive elastic portions 47 and 48 and the conductive elastic members 49 to 51 between the convex portions 812 and 912 and the conductive portions 20a to 20e, the conductive elastic portions 47 and 48 and the conductive elastic members 49 to 51 are formed at the convex portions 812 and 912. Since the conductive elastic members 49 to 51 are pressed, the connection between the conductive elastic portions 47 and 48 and the conductive elastic members 49 to 51 and the conductive portions 20a to 20e can be assisted, and connection failure can be prevented.

  As another example, the configuration of the conductive elastic portion 48 provided with the protruding portion 481 may be provided at the end portions of the conductive elastic members 49 to 51, the elastic member 4, and the like. If it is this structure, when covering an elastic member and a circuit board, a covering position can be determined as needed, and the poor connection etc. of a conductive elastic member and the conductive part of a circuit board can be prevented.

  Thus, according to the present invention, the periphery of the circuit board is covered with the elastic member to prevent entry of dust, dust, etc. into the light receiving area of the image sensor, and the elastic member is provided on the periphery of the circuit board. By performing the mounting process in the initial stage, dust generation in the assembly process of the imaging device can be prevented.

It is sectional drawing of an imaging device. It is the external view which visually recognized the circuit board from the to-be-photographed object side. It is sectional drawing which shows the peripheral part of an elastic member. It is an assembly process of an imaging device. It is an external view of the circuit board which provided the electroconductive part in the peripheral part of the circuit board. It is sectional drawing which shows the peripheral part of the electroconductive elastic member with which the circuit board was mounted | worn. It is the external view which visually recognized the circuit board with which the elastic member was mounted | worn from the to-be-photographed object side. It is an external view at the time of mounting an elastic member on a circuit board. It is an external view which mounted | wore the circuit board with the electroconductive elastic member which coat | covers or covers an elastic member. It is the sectional view on the AA line and BB line of FIG. It is sectional drawing which shows the peripheral part of an elastic member. It is sectional drawing which shows the peripheral part of an elastic member. It is sectional drawing which shows the peripheral part of an elastic member. It is sectional drawing of the front case and rear case which provided the discharge part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Circuit component 2 ... Imaging device 3 ... Circuit board 4 ... Elastic member 47, 48 ... Conductive elastic part 49, 50, 51, 52, 53 ... Conductive elastic member DESCRIPTION OF SYMBOLS 5 ... Optical filter 6 ... Lens 7 ... Holding member 8 ... Front case 9 ... Rear case 10 ... Imaging device

Claims (10)

A circuit board;
An image sensor connected to the circuit board;
An optical system for collecting external light on the image sensor;
An elastic member covering the peripheral edge of the circuit board;
A front case and a rear case for accommodating the circuit board by combining,
A light entrance is provided in the front case for allowing light to enter the image sensor via the optical system,
An imaging apparatus, wherein the elastic member is sandwiched between the front case and the rear case. 2. The imaging apparatus according to claim 1, wherein an inner wall surface closer to the subject than a surface of the front case sandwiching the elastic member is positioned closer to an optical axis side of the optical system than a peripheral edge of the circuit board. The convex part is provided in the surface which clamps the said elastic member of the said front case and / or the said rear case, and the recessed part or the step part was provided in the position of the said elastic member corresponding to this convex part. Or the imaging device of 2. The imaging apparatus according to claim 1, wherein a protrusion that determines a position of the circuit board in an optical axis direction is provided on the front case and / or the rear case. The auxiliary member for assisting the mounting or removal of the elastic member on the circuit board is provided at an end of the elastic member on the side of the circuit board and / or an end of the side of the circuit board opposite to the object. Item 5. The imaging device according to Items 1 to 4. 6. The conductive substrate according to claim 1, wherein a conductive portion is provided on all or part of a peripheral portion of the circuit board, and at least a portion of the elastic member covering the conductive portion is a conductive conductive elastic portion. The imaging device described. The elastic member that covers the peripheral edge of the circuit board from one end to the other end,
The conductive part is provided on all or a part of the peripheral part of the circuit board, and both ends of the elastic member are conductive elastic parts capable of conducting with the conductive part. Imaging device. The elastic member that covers the peripheral edge of the circuit board from one end to the other end,
A conductive part is provided on a part or all of the peripheral edge of the circuit board,
6. The imaging apparatus according to claim 1, further comprising a conductive elastic member that is connected to the conductive portion and that covers the elastic member and / or is covered with the elastic member. The elastic member that covers the peripheral edge of the circuit board from one end to the other end,
Provide a conductive discharge part in the front case and / or the rear case,
A conductive portion is provided on a part of the peripheral edge of the circuit board,
6. The imaging device according to claim 1, further comprising a conductive elastic member that penetrates one end and the other end of the elastic member to connect the discharge unit and the conductive unit. . A circuit board;
An image sensor connected to the circuit board;
An elastic member covering the peripheral edge of the circuit board;
By combining the front case and the rear case for housing the circuit board,
An assembly method for an imaging apparatus comprising:
After the step of coating the elastic member on the peripheral edge of the circuit board,
A method of assembling an imaging apparatus, comprising performing a step of clamping the elastic member between the front case and the rear case.

Images