JP6150688B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging apparatus such as a digital single-lens reflex camera, and more particularly to a technique for holding an imaging element inside the imaging apparatus.

  In an imaging device such as a digital camera, a photographic light beam is received by an image sensor such as a CCD sensor or a CMOS sensor, and a photoelectric conversion signal (analog electrical signal) output by photoelectric conversion from the image sensor is converted into image data (digital data). And stored in a storage medium such as a memory card. In the vicinity of the image sensor, a mechanical operation unit such as a shutter unit or a quick return mirror unit is disposed. For this reason, if vibrations of these operating parts are transmitted to the image sensor during reading of photoelectric conversion signals from the image sensor at the time of shooting, noise is generated as a piezoelectric effect inside the image sensor, resulting in image quality. Will be reduced.

  Therefore, a piezoelectric element that senses vibration generated when the photoelectric conversion signal is read out is arranged, noise of the photoelectric conversion signal generated due to the vibration is calculated based on the output signal of the piezoelectric element, and noise of the photoelectric conversion signal is calculated. There has been proposed a technique for performing a correction process for suppression (see Patent Document 1). Although not related to the imaging device, a structure has been proposed in which the influence of changes in the surrounding environment such as vibration and heat is not easily transmitted to the optical element. For example, a structure has been proposed in which an elastic member is sandwiched between two fastening portions of a housing to which an optical element is attached and a cover that closes the upper opening of the housing, so that they are not completely fixed to each other (Patent Document). 2).

JP 2011-114543 A JP 2006-150687 A

  However, in the technique described in Patent Document 1, since it is necessary to newly arrange a piezoelectric element to detect vibration, there is a problem that the cost is increased, the camera body is enlarged, or the structure of the imaging element unit is changed. The problem that it becomes necessary occurs. In addition, since time for correction processing is required, the camera sequence may be affected.

  Consider a case in which a configuration in which an elastic member is sandwiched between fastening portions as in the technique described in Patent Document 2 is applied to fixing an imaging element unit to a fixing member (such as a chassis of a camera body). In this case, there is a possibility that the image sensor unit is displaced with respect to the fixed member due to the impact applied from the outside by the amount of the backlash of the positioning portion of the image sensor unit with respect to the fixed member. If a deviation occurs between the image sensor unit and the fixing member, a deviation occurs between the viewfinder field held by the fixing member and the image to be picked up. Then, the field-of-view ratio, which is the ratio of the range of the image to be captured and the range of the viewfinder field of view, changes, and what was the target specification value at the time of manufacture may deviate from the specification due to impact or vibration. is there.

  The present invention suppresses transmission of vibration of a drive unit that affects an image to an image sensor while reading a photoelectric conversion signal from the image sensor, and captures an external shock or vibration. An object of the present invention is to provide an imaging device having a structure in which the arrangement position of the element unit is difficult to shift.

An image pickup apparatus according to the present invention has an image pickup element that converts a subject optical image into an electrical signal, a holding member that holds the image pickup element, a plurality of attachment portions to which the holding member is attached , and the holding member. wherein a fixing member having an opening of substantially rectangular formed facing position the imaging element when the, among the plurality of mounting portions, against deformation due to load direction perpendicular to the imaging plane of the imaging device section the second moment is the largest mounting unit Re mounting et to the holding member is the fixing member without interposing an elastic member between said first mounting member and the holding member using a first mounting member , even without less of other attachment portion of that in one attachment portion and the holding member is the fixed across the elastic member between the second mounting member and the holding member using a second attachment member mounted on the member Characterized in that it is.

  In the present invention, among the plurality of fastening portions of the holding member and the fixing member that hold the image sensor, the cross-section second moment with respect to deformation due to the load is large, and the fastening portion having the highest rigidity is fastened without sandwiching the elastic member. Do. On the other hand, in the other fastening part, the fastening which arranged the elastic member is performed. Accordingly, it is possible to suppress the vibration of the drive mechanism that affects the image from being transmitted to the image sensor during reading of the photoelectric conversion signal from the image sensor. As a result, it is difficult for noise to enter the photoelectric conversion signal, and image quality deterioration can be prevented. Further, since no means for detecting vibration of the piezoelectric element or the like is required, the cost can be avoided, and further, there is no need to perform signal processing for removing noise, so there is no influence on the camera sequence. In addition, even if an impact or vibration is applied to the image pickup apparatus or the image pickup element unit, the image pickup element unit is unlikely to be displaced with respect to the fixed member.

1 is an external perspective view of a digital single-lens reflex camera according to an embodiment of the present invention. It is a block diagram which shows the optical structure and electrical structure of the digital single-lens reflex camera of FIG. It is a disassembled perspective view which shows the periphery structure of the imaging unit with which the digital single-lens reflex camera of FIG. 1 is provided. It is the disassembled perspective view and side view which show the structure of the mirror unit with which the digital single-lens reflex camera of FIG. 1 is provided. It is a figure which shows an example of the fixing method of the imaging unit with which the digital single-lens reflex camera of FIG. 1 is provided. It is a perspective view which shows the internal structure mainly having the main body chassis of the digital single-lens reflex camera of FIG. FIG. 6 is a cross-sectional view taken along a line CC in FIG. 5, a cross-sectional view taken along a line DD, and a cross-sectional view taken along a line AA.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<First Embodiment>
FIG. 1 is an external perspective view of a digital single-lens reflex camera as an example of an imaging apparatus according to an embodiment of the present invention. More specifically, FIG. 1A is a perspective view seen from the front side of the camera, and shows a state in which the photographing lens unit (interchangeable lens) is removed. FIG. 1B is a perspective view seen from the back side of the camera.

  The camera body 1 of the digital single-lens reflex camera is provided with a grip portion 1 a and a mount portion 2. In the camera body 1, the grip portion 1a protrudes forward on the left side of FIG. 1 so that the user can easily hold the camera stably during shooting. The mount unit 2 is a part for fixing a detachable photographic lens unit (not shown) to the camera body 1 and includes a mount contact 21 therein. The mount contact 21 has a function of transmitting and receiving a control signal, a status signal, a data signal, and the like between the camera body 1 and the photographing lens unit and supplying power to the photographing lens unit. The mount contact 21 may have a configuration capable of optical communication, voice communication, etc. as well as electrical communication.

  The camera body 1 is provided with a lens lock release button 4, a mirror box 5, a shutter button 7, a main operation dial 8, an operation mode setting button 10, and an LCD display panel 9. The lens lock release button 4 is pushed when removing the photographing lens unit, so that the photographing lens unit can be detached from the camera body 1.

  The photographing light flux that has passed through the photographing lens 200 (see FIG. 2) of the photographing lens unit is guided to the mirror box 5 disposed inside the camera casing constituting the camera body 1. A quick return mirror unit (hereinafter referred to as “mirror unit”) 700 (see FIG. 2) is arranged inside the mirror box 5. The mirror unit 700 includes a main mirror 6 and a sub mirror 30 (see FIG. 2). The main mirror 6 guides the photographic light beam passing through the photographic lens 200 to the pentaprism 22 (see FIG. 2) and transmits a part thereof. The sub mirror 30 guides the photographing light beam transmitted through the pentaprism 22 to the focus detection sensor unit 31 (see FIG. 2). The main mirror 6 is held at an angle of 45 ° with respect to the photographic optical axis in order to guide the photographic light flux in the direction of the pentaprism 22 and to guide in the direction of the image sensor 33 (see FIG. 2). It can be in a state of being held at a position retracted from the photographing light flux.

  The shutter button 7 is disposed on the grip portion 1a side of the upper part of the camera body 1, and functions as a start switch for starting shooting. The main operation dial 8 can set the shutter speed and the lens aperture value according to the operation mode at the time of shooting. The operation mode setting button 10 sets an operation mode of the photographing system, such as setting whether continuous shooting or only one frame shooting is performed by pressing the shutter button 7 once or setting of a self-shooting mode. The LCD display panel 9 displays operation menus, operation results, setting conditions, and the like for various operation members.

  The camera body 1 is provided with a strobe unit 11, a shoe groove 12, a flash contact 13, a shooting mode setting dial 14 and an external terminal lid 15. The strobe unit 11 is disposed in the upper center of the camera body 1 and is not shown, but pops up with respect to the camera body 1 and is ready to emit light. The shoe groove 12 and the flash contact 13 are used for mounting an external strobe device or the like.

  The shooting mode setting dial 14 is disposed on the right side of FIG. 1A on the upper part of the camera body 1, and is set to a shooting mode (for example, auto mode, shutter speed priority mode, aperture priority mode, landscape mode, night view mode, macro mode). , Sports mode, etc.). The external terminal lid 15 is provided on the side surface of the camera body 1 opposite to the grip portion 1 a and can be opened and closed with respect to the camera body 1. Inside the external terminal lid 15, a video signal output jack 16 and a USB output connector 17 are provided as external interfaces.

  A finder eyepiece window 18, a color liquid crystal monitor 19, a sub operation dial 20, a main switch 43, and a cleaning instruction member 44 are provided on the back side of the camera body 1. The photographer can check the subject through the viewfinder eyepiece window 18. The color liquid crystal monitor 19 displays a captured image, a setting menu for performing various settings of the digital single lens reflex camera, and the like.

  The sub operation dial 20 plays a role of assisting the function of the main operation dial 8. For example, in the AE (automatic exposure) mode, the sub operation dial 20 is used to set an exposure correction amount with respect to an appropriate exposure value calculated by the AE function. Is done. For example, in the manual mode in which the photographer arbitrarily sets each of the shutter speed and the lens aperture value, the shutter speed is set with the main operation dial 8 and the lens aperture value is set with the sub operation dial 20. Is made. The sub operation dial 20 is also used for selecting and displaying a photographed image displayed on the color liquid crystal monitor 19. The main switch 43 switches activation / deactivation of the digital single-lens reflex camera. The cleaning instruction member 44 instructs execution of a cleaning mode in which foreign matter such as dust attached on the optical filter is screened out.

  FIG. 2 is a block diagram showing an optical configuration and an electrical configuration of the digital single-lens reflex camera. In FIG. 2, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and description of the components shown in FIG. 1 will be omitted in the following description.

  Overall operation control of the digital single-lens reflex camera is performed by a central processing unit (hereinafter referred to as “MPU”) 100 including a microcomputer built in the camera body 1. The MPU 100 executes various processes and instructions for each component constituting the digital single-lens reflex camera. The MPU 100 includes an EEPROM 100a that stores time information of a time measuring circuit 109 (described later) and other information.

  The photographic lens unit that can be attached to and detached from the camera body 1 includes a photographic lens 200, a lens control circuit 201, an AF drive circuit 202, an aperture drive circuit 203, and an aperture 204. In FIG. 2, the photographic lens 200 that takes in the photographic light flux is shown as a single lens for convenience, but the photographic lens 200 is actually composed of a plurality of lenses. The lens control circuit 201 and the MPU 100 communicate via the mount contact 21. The lens control circuit 201 controls the photographing lens 200 and the diaphragm 204 via the AF driving circuit 202 and the diaphragm driving circuit 203 based on the control signal from the MPU 100.

  The AF driving circuit 202 includes, for example, a stepping motor, and focuses the photographing light flux on the image sensor 33 (described later) by changing the position of the focus lens included in the photographing lens 200 according to the control by the lens control circuit 201. The aperture drive circuit 203 is configured by, for example, an auto iris or the like, and changes the aperture 204 according to control by the lens control circuit 201 to obtain an optical aperture value.

  The digital single lens reflex camera includes a mirror unit 700, a pentaprism 22, a photometric sensor 29, a photometric circuit 106, a focus detection sensor unit 31, a shutter unit 32, an imaging unit 400, a clamp / CDS circuit 34, and an AGC circuit (automatic gain adjustment circuit). 35 and an A / D converter 36. The digital single-lens reflex camera includes a mirror driving circuit 101, a focus detection circuit 102, a shutter driving circuit 103, a video signal processing circuit 104, a buffer memory 37, a memory controller 38, a memory 39, a piezoelectric element driving circuit 111, and a color liquid crystal driving circuit. 112.

  The mirror unit 700 includes a main mirror 6 and a sub mirror 30. The mirror drive circuit 101 is composed of, for example, a DC motor and a gear train, and moves the main mirror 6 between a position where the subject image can be observed through the viewfinder eyepiece window 18 and a position where the subject image is retracted from the photographing light flux. Let At the same time as this operation, the mirror drive circuit 101 moves the sub mirror 30 between a position for guiding the imaging light beam to the focus detection sensor unit 31 and a position for retracting from the imaging light beam.

  The pentaprism 22 converts and reflects the photographing light beam reflected by the main mirror 6 into an erect image, and guides a part of the photographing light beam to the photometric sensor 29. The photometric circuit 106 obtains the output of the photometric sensor 29, converts it into a luminance signal of each area on the observation surface, and outputs it to the MPU 100. The MPU 100 calculates an exposure value based on the luminance signal acquired from the photometry circuit 106.

  The focus detection sensor unit 31 includes a field lens (not shown), a reflection mirror, a secondary imaging lens, a diaphragm, a line sensor including a plurality of CCDs, and the like disposed in the vicinity of the imaging surface. An output signal from the focus detection sensor unit 31 is supplied to the focus detection circuit 102, converted into a subject image signal by the focus detection circuit 102, and then transmitted to the MPU 100. The MPU 100 performs a focus detection calculation by a phase difference detection method based on the received subject image signal, and obtains a defocus amount and a defocus direction. Further, the MPU 100 moves the focus lens included in the photographing lens 200 to the in-focus position via the lens control circuit 201 and the AF driving circuit 202 based on the defocus amount and the defocus direction.

  The shutter unit 32 is, for example, a mechanical focal plane shutter, and is controlled by the shutter drive circuit 103 that has received a command from the MPU 100. The shutter unit 32 blocks the photographing light flux when the photographer is observing the subject through the viewfinder eyepiece window 18, and at the time of imaging, the shutter unit 32 performs desired exposure depending on the time difference between the leading blade group and the trailing blade group (not shown) according to the release signal. Get time.

  The imaging unit 400 includes an infrared cut filter 410, a piezoelectric element 430, an optical low-pass filter 420, and the imaging element 33. The surface of the infrared cut filter 410 is covered with a conductive material in order to prevent foreign matter from adhering. The optical low-pass filter 420 has a laminated structure in which a plurality of birefringent plates made of quartz or the like and a phase plate are bonded together, separates a light beam incident on the image sensor 33 into a plurality, and generates a false resolution signal or false color. Effectively reduce signal generation. The piezoelectric element 430 is a vibration unit that vibrates the optical low-pass filter 420. The piezoelectric element 430 is vibrated by the piezoelectric element driving circuit 111 that receives a command from the MPU 100 and vibrates integrally with the infrared cut filter 410. Yes. The imaging device 33 is a CCD sensor, a CMOS sensor, or a CID sensor that converts an optical subject image into an analog electrical signal.

  The clamp / CDS circuit (correlated double sampling circuit) 34 performs basic analog processing before the A / D conversion and change of the clamp level for the analog electric signal output from the image sensor 33, and after the processing, An analog signal is output to the AGC circuit 35. The AGC circuit 35 performs basic analog processing before A / D conversion on the analog electric signal received from the clamp / CDS circuit 34, changes the AGC basic level, and converts the analog signal after processing to A / D. Output to the converter 36. The A / D converter 36 converts the analog electric signal output from the AGC circuit 35 into a digital signal, and outputs the processed digital signal (image data) to the video signal processing circuit 104.

  The video signal processing circuit 104 performs overall image processing by hardware such as gamma / knee processing, filter processing, and information composition processing for monitor display on the digitized image data. The monitor display image data output from the video signal processing circuit 104 is displayed on the color liquid crystal monitor 19 via the color liquid crystal drive circuit 112. Further, the video signal processing circuit 104 stores the image data in the buffer memory 37 through the memory controller 38 in accordance with an instruction from the MPU 100. Furthermore, the video signal processing circuit 104 has a function of performing image data compression processing such as JPEG. With a digital single-lens reflex camera, when continuous shooting such as continuous shooting is performed, it is also possible to temporarily store image data in the buffer memory 37 and sequentially read unprocessed image data through the memory controller 38. Accordingly, the video signal processing circuit 104 can sequentially perform image processing and compression processing regardless of the speed of the image data input from the A / D converter 36.

  The memory controller 38 stores image data input through the external interface 40 such as the video signal output jack 16 and the USB output connector 17 in the memory 39, and conversely, the image data stored in the memory 39 is stored in the external interface. Output to 40. The memory 39 is a flash memory that can be attached to and detached from the camera body 1.

  The digital single lens reflex camera includes a switch sense circuit 105, a liquid crystal display drive circuit 107, a battery check circuit 108, a time measurement circuit 109, and a power supply circuit 110.

  A shutter button 7 is connected to the switch sense circuit 105. The shutter button 7 is composed of a two-stage switch of a switch SW1 that is turned on when half-pressed and a switch SW2 that is turned on when fully pressed. When the switch SW1 is turned on, AE operation and AF operation are performed, and when the switch SW2 is turned on, exposure is started and photographing is performed. The switch sense circuit 105 is connected to the main operation dial 8, the sub operation dial 20, the shooting mode setting dial 14, the main switch 43, and the cleaning instruction member 44, and input signals corresponding to the operation states of these switches. Is transmitted to the MPU 100.

  The liquid crystal display drive circuit 107 drives the LCD display panel 9 and the in-finder liquid crystal display 41 provided in the viewfinder in accordance with an instruction from the MPU 100. The battery check circuit 108 performs a battery check according to a signal from the MPU 100 and sends a detection result to the MPU 100. The power supply unit 42 supplies necessary power to each component of the digital single-lens reflex camera. The time measurement circuit 109 measures the time and date from when the main switch 43 is turned off to when it is turned on, and transmits the measurement result to the MPU 100 according to a command from the MPU 100.

  FIG. 3 is an exploded perspective view showing the peripheral structure of the imaging unit 400. In FIG. 3 and the following description, when the digital single-lens reflex camera is viewed from the back side, the right direction is the X direction, the upper direction is the Y direction, and the subject direction (the optical axis direction, that is, orthogonal to the imaging plane of the image sensor 33). Direction) to be the Z direction, and these X, Y, and Z directions are used in the description as appropriate.

  The mirror box 5 and the shutter unit 32 are arranged in this order from the subject side on the subject side of the main body chassis 300 that is the skeleton of the camera body 1, and the mirror unit 700 is incorporated in the mirror box 5. Further, a mirror drive base plate 701 is disposed on the side surface of the mirror box 5, and the mirror unit 700 is driven up and down by a mirror drive mechanism (not shown). Although details will be described later, a stopper lever 703 is attached to the mirror driving base plate 701 using a stopper sleeve 705, and a stopper dowel 702 is attached to the stopper lever 703.

  An imaging unit 400 is disposed on the photographer side of the main body chassis 300. The imaging unit 400 includes a piezoelectric element unit 470 and an imaging element unit 500. The image sensor unit 500 includes an image sensor 33 and a holding member 510 that holds the image sensor 33. The main body chassis 300 is provided with a substantially rectangular opening 302 at a position facing the image sensor 33 held by the holding member 510 in order to allow the photographing light flux to pass therethrough.

  The main body chassis 300 is a fixing member that fixes the imaging unit 400. That is, the imaging unit 400 is positioned with respect to the main body chassis 300 by the positioning pins 604 and is fixed to the main body chassis 300 by the first fastening member 601 and the second fastening member 600. At this time, the imaging unit 400 is configured so that the imaging surface of the imaging device 33 is spaced a predetermined distance from and parallel to the mounting surface of the mount unit 2 that serves as a reference for mounting the photographic lens unit. It is fixed via an adjustment washer 602 for absorbing dimensional errors. A rubber bush 603 as an elastic member is disposed between the second fastening member 600 and the holding member 510.

  The piezoelectric element unit 470 is fixed to the imaging element unit 500 with an elastic member interposed therebetween. The piezoelectric element unit 470 generates fine vibrations in the glass of the optical low-pass filter 420 due to the piezoelectric effect, and removes dust attached to the surface. The piezoelectric element unit 470 is configured by a known technique, and a detailed description thereof is omitted here.

  4A is an exploded perspective view showing the structure of the mirror unit 700, and FIGS. 4B and 4C are side views of the mirror unit 700 viewed from the X direction. Hereinafter, generation of vibration caused by driving of the mirror unit 700 will be described.

  As shown in FIG. 4A, a mirror drive base plate 701 is assembled to the mirror box 5. A stopper lever 703 is attached to the mirror drive base plate 701 using a stopper sleeve 705, and a stopper dowel 702 is attached to the stopper lever 703. The stopper dowel 702 is formed of a hard material such as a metal material or a synthetic resin material. At the down stop position, the mirror unit 700 and the stopper dowel 702 come into contact with each other, so that the mirror unit 700 can be accurately stopped. Although only the stopper dowel 702 is shown in the present embodiment, an impact absorbing dowel may be provided on the opposite side of the mirror unit 700 across the optical axis so as to be displaced from the stopper dowel 702. The mirror unit 700 hits the stopper dowel 702 when down and stops after bouncing.

  As shown in FIG. 4B, a stopper spring 706 is attached to the stopper sleeve 705. The stopper spring 706 urges the stopper pin 707 in the direction of the arrow and presses the stopper lever 703 against the mirror positioning pin 704. ing. The mirror positioning pin 704 is an eccentric pin, and adjusts the down stop position of the mirror unit 700 via the stopper lever 703 and the stopper dowel 702.

  The mirror drive base plate 701 is provided with an impact absorbing member 708. As shown in FIG. 4C, when the mirror unit 700 is down, the stopper dowel 702 is pushed in the direction of the arrow, and the stopper lever 703 hits the impact absorbing member 708. Thereby, the kinetic energy of the mirror unit 700 is absorbed, and the bounce of the mirror unit 700 is suppressed.

  Part of the vibration when the mirror unit 700 and the stopper dowel 702 come into contact with each other is absorbed by the shock absorbing member 708. However, a part of the vibration is transmitted to the mirror drive base plate 701 via the stopper sleeve 705 and the impact absorbing member 708, and further reaches the imaging unit 400 through the mirror box 5 and the main body chassis 300. As a result, noise is generated as a piezoelectric effect inside the image pickup device 33, and the image quality is deteriorated.

  FIG. 5 is a diagram illustrating an example of a method for fixing the imaging unit 400. FIG. 5 shows a state viewed from the Z direction. In the two fastening portions 303R and 303B by the second fastening member 600 and the one fastening portion 303L by the first fastening member 601, a portion having high rigidity becomes a vibration node, and the amplitude tends to be small. is there. Here, in the vicinity of the corner of the substantially rectangular opening 302 (see FIG. 3) of the main body chassis 300, the side portions of the opening 302 support the deformation in the X direction and the Y direction in the longitudinal direction. . Therefore, in the vicinity of the corner portion of the opening 302, if the deformation is attempted with a load parallel to the XY plane, the second moment of the section with respect to the deformation due to the load in each of the X direction and the Y direction is large, so that the deformation is difficult. On the other hand, in the central part of the side, since the secondary moment of deformation with respect to the deformation due to the load in the longitudinal direction (X direction) is large, it is difficult to deform, but the secondary moment of inertia with respect to the deformation due to the load in the width direction (Y direction) is small. It is easy to deform.

  FIG. 6 is a perspective view showing an internal structure of a digital single-lens reflex camera mainly including the main body chassis 300. In the present embodiment, the reinforcing portion 301 is formed in the Z direction in the fastening portion 303L of the main body chassis 300, thereby increasing the second moment of section with respect to the deformation caused by the load in the Z direction and enhancing the rigidity in the Z direction. Yes. In other words, among the three fastening portions 303L, 303R, and 303B, the fastening portion 303L has the highest cross-sectional moment for deformation caused by loads in the X direction, Y direction, and Z direction, and is the most rigid portion. ing.

  Therefore, in the present embodiment, the fastening portion 303 </ b> L near the corner of the opening 302 and having the reinforcing portion 301 formed in the Z direction is used with the first fastening member 601 without the rubber bush 603 interposed therebetween. It is fixed. On the other hand, in the fastening portion 303R where the reinforcing portion is not formed in the Z direction and the fastening portion 303B that is not near the corner portion of the opening 302, the second fastening member 600 is fixed with the rubber bush 603 interposed therebetween as described above. ing. The reason for this will be described below with reference to FIG.

  FIGS. 7A, 7B, and 7C are a cross-sectional view taken along the line CC in FIG. 5, a cross-sectional view taken along the line DD, and a cross-sectional view taken along the line AA in FIG. FIG. 7A shows a positioning configuration of the main body chassis 300 and the imaging unit 400. The positioning pin 604 and the holding member 510 are fixed by caulking. Further, the positioning pin 604 and the main body chassis 300 are fitted in the P portion, and here, a fitting play considering the processing accuracy is provided.

  If the rubber bush 603 is disposed in all the fastening portions 303L, 303R, and 303B of the holding member 510 and the main body chassis 300, the fitting between the holding member 510 and the main body chassis 300 due to the impact applied to the camera body 1 is assumed. There is a possibility that a shift will occur by the amount of play. Therefore, as shown in FIG. 7B, among the fastening portions 303L, 303R, and 303B, the fastening portion 303L that has the largest cross-sectional second moment against deformation due to the load in each direction in the X, Y, and Z directions and has the highest rigidity. In this case, the rubber bush 603 is not disposed. As a result, the holding member 510 is structured not to be displaced with respect to the main body chassis 300.

  FIG. 7B illustrates a fastening configuration (a cross-sectional structure of the fastening portion 303 </ b> L) between the main body chassis 300 and the imaging unit 400 without the rubber bush 603 interposed therebetween. The first fastening member 601 is a general screw, and fixes the holding member 510 to the main body chassis 300. By not sandwiching the rubber bush 603, it is possible to firmly fix the rubber bush 603, and it is possible to suppress the occurrence of displacement due to the loose play of the P portion due to vibration or impact applied to the camera body 1.

  FIG. 7C shows a fastening configuration of the main body chassis 300 and the imaging unit 400 with the rubber bush 603 interposed therebetween. FIG. 7C shows the cross-sectional structure of the fastening portion 303B, but the fastening portion 303R has the same structure. The second fastening member 600 is a stepped screw, and is fixed to the main body chassis 300 by a screw portion thereof. A rubber bush 603 is compressed and sandwiched between the screw heads of the holding member 510 and the second fastening member 600, and the holding member 510 is urged against the main body chassis 300 by the compression force of the rubber bush 603. Therefore, even when the main body chassis 300 vibrates, the holding member 510 can further compress the rubber bushing 603, thereby reducing the propagating vibration.

  As described above, according to the present embodiment, among the plurality of fastening portions between the holding member 510 that holds the image sensor 33 and the main body chassis 300, the cross-section second moment with respect to deformation due to the load is large, and the fastening portion having the highest rigidity Fastening is performed without holding an elastic member such as a rubber bush. Thereby, even if an impact or vibration is applied to the camera body 1 or the image pickup unit 400, the image pickup unit 400 is not easily displaced with respect to the main body chassis 300. Therefore, the specifications at the time of manufacturing the digital single-lens reflex camera can be maintained.

  On the other hand, in other fastening portions, the transmission of vibration is suppressed by arranging an elastic member. Thereby, it is possible to suppress the vibration of the drive mechanism that affects the image of the mirror unit 700 or the like from being transmitted to the image sensor 33 during reading of the photoelectric conversion signal from the image sensor 33. Therefore, it is difficult for noise to enter the photoelectric conversion signal, and deterioration in image quality can be prevented. Further, since it is not necessary to separately provide a means for detecting vibrations, it is possible to avoid an increase in cost, and it is not necessary to perform signal processing for removing noise, so that the camera sequence is not affected.

<Other embodiments>
Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included. For example, in the above-described embodiment, the rubber bush 603 is not sandwiched only at one of the three fastening portions 303L, 303R, and 303B (303L) of the main body chassis 300 and the imaging unit 400. However, the present invention is not limited to this. For example, if there are two fastening portions where the reinforcing portions 301 are formed in the Z direction in the vicinity of the corners of the substantially rectangular opening 302 of the main body chassis 300, both of them are used. The first fastening member 601 may be fixed without sandwiching the rubber bush 603.

  Further, the fixing of the imaging unit 400 (holding member 510) may be changed according to the structure of the camera body. For example, in the above embodiment, the holding member 510 is fixed to the main body chassis 300, but the present invention is not limited to this, and the holding member 510 may be fixed to the mirror box 5. In that case, the fastening portion provided with the elastic member and the fastening portion provided with no elastic member may be arranged in consideration of the rigidity and strength of the mirror box 5. Furthermore, instead of the rubber bush 603, a configuration using a coil spring may be adopted.

DESCRIPTION OF SYMBOLS 5 Mirror box 32 Shutter unit 33 Image pick-up element 300 Main body chassis 301 Reinforcement part 302 Opening part 303L, R, B Fastening part 400 Imaging unit 500 Image pick-up element unit 510 Holding member 600 Step screw (2nd fastening member)
601 General screw (first fastening member)
603 Rubber bush

Claims (7)

An image sensor that converts an optical object image into an electrical signal;
A holding member for holding the image sensor;
A plurality of attachment portions to which the holding member is attached , and a fixing member having a substantially rectangular opening formed at a position facing the image sensor when the holding member is attached ,
Wherein the plurality of mounting portions, the image pickup element holding member and the first with the first mounting member in the largest mounting unit is the second moment of relative deformation due to the load direction perpendicular to the imaging plane of the holding member without interposing an elastic member between the mounting member is attached, et al is to the fixing member, using said second mounting member in the one mounting unit even without less of other attachment portion of its an imaging device said holding member across the elastic member, characterized in that fit these to the fixed member between the holding member second mounting member. The imaging apparatus according to claim 1, wherein an attachment portion in which the first attachment member is used among the plurality of attachment portions is provided in the vicinity of a corner portion of the opening. 3. The imaging device according to claim 1, wherein one of the plurality of attachment portions where the second attachment member is used is provided in the vicinity of a corner of the opening. 4. . In the vicinity of the plurality of mounting the mounting portion sac Chi before SL is the first attachment member used portion, the reinforcing portion to increase the second moment against deformation due to load direction perpendicular to the imaging plane of the imaging element the imaging apparatus according to any one of claims 1 to 3, characterized in that are provided. The second attachment member, the imaging apparatus according to any one of claims 1 to 4, characterized in that a stepped screw. The elastic member is an imaging device according to any one of claims 1 to 5, characterized in that a rubber bushing or the coil spring. The fixing member, the imaging apparatus according to any one of claims 1 to 6, characterized in that a mirror box having the drive mechanism and the main chassis or the mirror as a frame of the image pickup device.